1 /*
2 * SSL/TLS interface functions for OpenSSL
3 * Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10 #ifdef CONFIG_TESTING_OPTIONS
11 #include <fcntl.h>
12 #endif /* CONFIG_TESTING_OPTIONS */
13
14 #ifndef CONFIG_SMARTCARD
15 #ifndef OPENSSL_NO_ENGINE
16 #ifndef ANDROID
17 #define OPENSSL_NO_ENGINE
18 #endif
19 #endif
20 #endif
21
22 #ifndef OPENSSL_NO_ENGINE
23 /* OpenSSL 3.0 has moved away from the engine API */
24 #define OPENSSL_SUPPRESS_DEPRECATED
25 #include <openssl/engine.h>
26 #endif /* OPENSSL_NO_ENGINE */
27 #include <openssl/ssl.h>
28 #include <openssl/err.h>
29 #include <openssl/opensslv.h>
30 #include <openssl/pkcs12.h>
31 #include <openssl/x509v3.h>
32 #if OPENSSL_VERSION_NUMBER >= 0x30000000L
33 #include <openssl/core_names.h>
34 #include <openssl/decoder.h>
35 #include <openssl/param_build.h>
36 #else /* OpenSSL version >= 3.0 */
37 #ifndef OPENSSL_NO_DSA
38 #include <openssl/dsa.h>
39 #endif
40 #ifndef OPENSSL_NO_DH
41 #include <openssl/dh.h>
42 #endif
43 #endif /* OpenSSL version >= 3.0 */
44
45 #include "common.h"
46 #include "utils/list.h"
47 #include "crypto.h"
48 #include "sha1.h"
49 #include "sha256.h"
50 #include "tls.h"
51 #include "tls_openssl.h"
52
53 #if !defined(CONFIG_FIPS) && \
54 (defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || \
55 defined(EAP_SERVER_FAST))
56 #define OPENSSL_NEED_EAP_FAST_PRF
57 #endif
58
59 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || \
60 defined(EAP_SERVER_FAST) || defined(EAP_TEAP) || \
61 defined(EAP_SERVER_TEAP)
62 #define EAP_FAST_OR_TEAP
63 #endif
64
65
66 #if defined(OPENSSL_IS_BORINGSSL)
67 /* stack_index_t is the return type of OpenSSL's sk_XXX_num() functions. */
68 typedef size_t stack_index_t;
69 #else
70 typedef int stack_index_t;
71 #endif
72
73 #ifdef SSL_set_tlsext_status_type
74 #ifndef OPENSSL_NO_TLSEXT
75 #define HAVE_OCSP
76 #include <openssl/ocsp.h>
77 #endif /* OPENSSL_NO_TLSEXT */
78 #endif /* SSL_set_tlsext_status_type */
79
80 #if OPENSSL_VERSION_NUMBER < 0x10100000L && \
81 !defined(BORINGSSL_API_VERSION)
82 /*
83 * SSL_get_client_random() and SSL_get_server_random() were added in OpenSSL
84 * 1.1.0 and newer BoringSSL revisions. Provide compatibility wrappers for
85 * older versions.
86 */
87
SSL_get_client_random(const SSL * ssl,unsigned char * out,size_t outlen)88 static size_t SSL_get_client_random(const SSL *ssl, unsigned char *out,
89 size_t outlen)
90 {
91 if (!ssl->s3 || outlen < SSL3_RANDOM_SIZE)
92 return 0;
93 os_memcpy(out, ssl->s3->client_random, SSL3_RANDOM_SIZE);
94 return SSL3_RANDOM_SIZE;
95 }
96
97
SSL_get_server_random(const SSL * ssl,unsigned char * out,size_t outlen)98 static size_t SSL_get_server_random(const SSL *ssl, unsigned char *out,
99 size_t outlen)
100 {
101 if (!ssl->s3 || outlen < SSL3_RANDOM_SIZE)
102 return 0;
103 os_memcpy(out, ssl->s3->server_random, SSL3_RANDOM_SIZE);
104 return SSL3_RANDOM_SIZE;
105 }
106
107
108 #ifdef OPENSSL_NEED_EAP_FAST_PRF
SSL_SESSION_get_master_key(const SSL_SESSION * session,unsigned char * out,size_t outlen)109 static size_t SSL_SESSION_get_master_key(const SSL_SESSION *session,
110 unsigned char *out, size_t outlen)
111 {
112 if (!session || session->master_key_length < 0 ||
113 (size_t) session->master_key_length > outlen)
114 return 0;
115 if ((size_t) session->master_key_length < outlen)
116 outlen = session->master_key_length;
117 os_memcpy(out, session->master_key, outlen);
118 return outlen;
119 }
120 #endif /* OPENSSL_NEED_EAP_FAST_PRF */
121
122 #endif
123
124 #if OPENSSL_VERSION_NUMBER < 0x10100000L
ASN1_STRING_get0_data(const ASN1_STRING * x)125 static const unsigned char * ASN1_STRING_get0_data(const ASN1_STRING *x)
126 {
127 return ASN1_STRING_data((ASN1_STRING *) x);
128 }
129 #endif
130
131 #ifdef ANDROID
132 #include <openssl/pem.h>
133 #include <keystore/keystore_get.h>
134
BIO_from_keystore(const char * key)135 static BIO * BIO_from_keystore(const char *key)
136 {
137 BIO *bio = NULL;
138 uint8_t *value = NULL;
139 int length = keystore_get(key, strlen(key), &value);
140 if (length != -1 && (bio = BIO_new(BIO_s_mem())) != NULL)
141 BIO_write(bio, value, length);
142 free(value);
143 return bio;
144 }
145
146
tls_add_ca_from_keystore(X509_STORE * ctx,const char * key_alias)147 static int tls_add_ca_from_keystore(X509_STORE *ctx, const char *key_alias)
148 {
149 BIO *bio = BIO_from_keystore(key_alias);
150 STACK_OF(X509_INFO) *stack = NULL;
151 stack_index_t i;
152
153 if (bio) {
154 stack = PEM_X509_INFO_read_bio(bio, NULL, NULL, NULL);
155 BIO_free(bio);
156 }
157
158 if (!stack) {
159 wpa_printf(MSG_WARNING, "TLS: Failed to parse certificate: %s",
160 key_alias);
161 return -1;
162 }
163
164 for (i = 0; i < sk_X509_INFO_num(stack); ++i) {
165 X509_INFO *info = sk_X509_INFO_value(stack, i);
166
167 if (info->x509)
168 X509_STORE_add_cert(ctx, info->x509);
169 if (info->crl)
170 X509_STORE_add_crl(ctx, info->crl);
171 }
172
173 sk_X509_INFO_pop_free(stack, X509_INFO_free);
174
175 return 0;
176 }
177
178
tls_add_ca_from_keystore_encoded(X509_STORE * ctx,const char * encoded_key_alias)179 static int tls_add_ca_from_keystore_encoded(X509_STORE *ctx,
180 const char *encoded_key_alias)
181 {
182 int rc = -1;
183 int len = os_strlen(encoded_key_alias);
184 unsigned char *decoded_alias;
185
186 if (len & 1) {
187 wpa_printf(MSG_WARNING, "Invalid hex-encoded alias: %s",
188 encoded_key_alias);
189 return rc;
190 }
191
192 decoded_alias = os_malloc(len / 2 + 1);
193 if (decoded_alias) {
194 if (!hexstr2bin(encoded_key_alias, decoded_alias, len / 2)) {
195 decoded_alias[len / 2] = '\0';
196 rc = tls_add_ca_from_keystore(
197 ctx, (const char *) decoded_alias);
198 }
199 os_free(decoded_alias);
200 }
201
202 return rc;
203 }
204
205 #endif /* ANDROID */
206
207 static int tls_openssl_ref_count = 0;
208 static int tls_ex_idx_session = -1;
209
210 struct tls_session_data {
211 struct dl_list list;
212 struct wpabuf *buf;
213 };
214
215 struct tls_context {
216 void (*event_cb)(void *ctx, enum tls_event ev,
217 union tls_event_data *data);
218 void *cb_ctx;
219 int cert_in_cb;
220 char *ocsp_stapling_response;
221 struct dl_list sessions; /* struct tls_session_data */
222 };
223
224 static struct tls_context *tls_global = NULL;
225
226
227 struct tls_data {
228 SSL_CTX *ssl;
229 unsigned int tls_session_lifetime;
230 int check_crl;
231 int check_crl_strict;
232 char *ca_cert;
233 unsigned int crl_reload_interval;
234 struct os_reltime crl_last_reload;
235 char *check_cert_subject;
236 char *openssl_ciphers;
237 };
238
239 struct tls_connection {
240 struct tls_context *context;
241 struct tls_data *data;
242 SSL_CTX *ssl_ctx;
243 SSL *ssl;
244 BIO *ssl_in, *ssl_out;
245 #if defined(ANDROID) || !defined(OPENSSL_NO_ENGINE)
246 ENGINE *engine; /* functional reference to the engine */
247 EVP_PKEY *private_key; /* the private key if using engine */
248 #endif /* OPENSSL_NO_ENGINE */
249 char *subject_match, *altsubject_match, *suffix_match, *domain_match;
250 char *check_cert_subject;
251 int read_alerts, write_alerts, failed;
252
253 tls_session_ticket_cb session_ticket_cb;
254 void *session_ticket_cb_ctx;
255
256 /* SessionTicket received from OpenSSL hello_extension_cb (server) */
257 u8 *session_ticket;
258 size_t session_ticket_len;
259
260 unsigned int ca_cert_verify:1;
261 unsigned int cert_probe:1;
262 unsigned int server_cert_only:1;
263 unsigned int invalid_hb_used:1;
264 unsigned int success_data:1;
265 unsigned int client_hello_generated:1;
266 unsigned int server:1;
267
268 u8 srv_cert_hash[32];
269
270 unsigned int flags;
271
272 X509 *peer_cert;
273 X509 *peer_issuer;
274 X509 *peer_issuer_issuer;
275 char *peer_subject; /* peer subject info for authenticated peer */
276
277 unsigned char client_random[SSL3_RANDOM_SIZE];
278 unsigned char server_random[SSL3_RANDOM_SIZE];
279
280 u16 cipher_suite;
281 int server_dh_prime_len;
282 };
283
284
tls_context_new(const struct tls_config * conf)285 static struct tls_context * tls_context_new(const struct tls_config *conf)
286 {
287 struct tls_context *context = os_zalloc(sizeof(*context));
288 if (context == NULL)
289 return NULL;
290 dl_list_init(&context->sessions);
291 if (conf) {
292 context->event_cb = conf->event_cb;
293 context->cb_ctx = conf->cb_ctx;
294 context->cert_in_cb = conf->cert_in_cb;
295 }
296 return context;
297 }
298
299
300 #ifdef CONFIG_NO_STDOUT_DEBUG
301
_tls_show_errors(void)302 static void _tls_show_errors(void)
303 {
304 unsigned long err;
305
306 while ((err = ERR_get_error())) {
307 /* Just ignore the errors, since stdout is disabled */
308 }
309 }
310 #define tls_show_errors(l, f, t) _tls_show_errors()
311
312 #else /* CONFIG_NO_STDOUT_DEBUG */
313
tls_show_errors(int level,const char * func,const char * txt)314 static void tls_show_errors(int level, const char *func, const char *txt)
315 {
316 unsigned long err;
317
318 wpa_printf(level, "OpenSSL: %s - %s %s",
319 func, txt, ERR_error_string(ERR_get_error(), NULL));
320
321 while ((err = ERR_get_error())) {
322 wpa_printf(MSG_INFO, "OpenSSL: pending error: %s",
323 ERR_error_string(err, NULL));
324 }
325 }
326
327 #endif /* CONFIG_NO_STDOUT_DEBUG */
328
329
tls_crl_cert_reload(const char * ca_cert,int check_crl)330 static X509_STORE * tls_crl_cert_reload(const char *ca_cert, int check_crl)
331 {
332 int flags;
333 X509_STORE *store;
334
335 store = X509_STORE_new();
336 if (!store) {
337 wpa_printf(MSG_DEBUG,
338 "OpenSSL: %s - failed to allocate new certificate store",
339 __func__);
340 return NULL;
341 }
342
343 if (ca_cert && X509_STORE_load_locations(store, ca_cert, NULL) != 1) {
344 tls_show_errors(MSG_WARNING, __func__,
345 "Failed to load root certificates");
346 X509_STORE_free(store);
347 return NULL;
348 }
349
350 flags = check_crl ? X509_V_FLAG_CRL_CHECK : 0;
351 if (check_crl == 2)
352 flags |= X509_V_FLAG_CRL_CHECK_ALL;
353
354 X509_STORE_set_flags(store, flags);
355
356 return store;
357 }
358
359
360 #ifdef CONFIG_NATIVE_WINDOWS
361
362 /* Windows CryptoAPI and access to certificate stores */
363 #include <wincrypt.h>
364
365 #ifdef __MINGW32_VERSION
366 /*
367 * MinGW does not yet include all the needed definitions for CryptoAPI, so
368 * define here whatever extra is needed.
369 */
370 #define CERT_SYSTEM_STORE_CURRENT_USER (1 << 16)
371 #define CERT_STORE_READONLY_FLAG 0x00008000
372 #define CERT_STORE_OPEN_EXISTING_FLAG 0x00004000
373
374 #endif /* __MINGW32_VERSION */
375
376
377 struct cryptoapi_rsa_data {
378 const CERT_CONTEXT *cert;
379 HCRYPTPROV crypt_prov;
380 DWORD key_spec;
381 BOOL free_crypt_prov;
382 };
383
384
cryptoapi_error(const char * msg)385 static void cryptoapi_error(const char *msg)
386 {
387 wpa_printf(MSG_INFO, "CryptoAPI: %s; err=%u",
388 msg, (unsigned int) GetLastError());
389 }
390
391
cryptoapi_rsa_pub_enc(int flen,const unsigned char * from,unsigned char * to,RSA * rsa,int padding)392 static int cryptoapi_rsa_pub_enc(int flen, const unsigned char *from,
393 unsigned char *to, RSA *rsa, int padding)
394 {
395 wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
396 return 0;
397 }
398
399
cryptoapi_rsa_pub_dec(int flen,const unsigned char * from,unsigned char * to,RSA * rsa,int padding)400 static int cryptoapi_rsa_pub_dec(int flen, const unsigned char *from,
401 unsigned char *to, RSA *rsa, int padding)
402 {
403 wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
404 return 0;
405 }
406
407
cryptoapi_rsa_priv_enc(int flen,const unsigned char * from,unsigned char * to,RSA * rsa,int padding)408 static int cryptoapi_rsa_priv_enc(int flen, const unsigned char *from,
409 unsigned char *to, RSA *rsa, int padding)
410 {
411 struct cryptoapi_rsa_data *priv =
412 (struct cryptoapi_rsa_data *) rsa->meth->app_data;
413 HCRYPTHASH hash;
414 DWORD hash_size, len, i;
415 unsigned char *buf = NULL;
416 int ret = 0;
417
418 if (priv == NULL) {
419 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
420 ERR_R_PASSED_NULL_PARAMETER);
421 return 0;
422 }
423
424 if (padding != RSA_PKCS1_PADDING) {
425 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
426 RSA_R_UNKNOWN_PADDING_TYPE);
427 return 0;
428 }
429
430 if (flen != 16 /* MD5 */ + 20 /* SHA-1 */) {
431 wpa_printf(MSG_INFO, "%s - only MD5-SHA1 hash supported",
432 __func__);
433 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
434 RSA_R_INVALID_MESSAGE_LENGTH);
435 return 0;
436 }
437
438 if (!CryptCreateHash(priv->crypt_prov, CALG_SSL3_SHAMD5, 0, 0, &hash))
439 {
440 cryptoapi_error("CryptCreateHash failed");
441 return 0;
442 }
443
444 len = sizeof(hash_size);
445 if (!CryptGetHashParam(hash, HP_HASHSIZE, (BYTE *) &hash_size, &len,
446 0)) {
447 cryptoapi_error("CryptGetHashParam failed");
448 goto err;
449 }
450
451 if ((int) hash_size != flen) {
452 wpa_printf(MSG_INFO, "CryptoAPI: Invalid hash size (%u != %d)",
453 (unsigned) hash_size, flen);
454 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
455 RSA_R_INVALID_MESSAGE_LENGTH);
456 goto err;
457 }
458 if (!CryptSetHashParam(hash, HP_HASHVAL, (BYTE * ) from, 0)) {
459 cryptoapi_error("CryptSetHashParam failed");
460 goto err;
461 }
462
463 len = RSA_size(rsa);
464 buf = os_malloc(len);
465 if (buf == NULL) {
466 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE);
467 goto err;
468 }
469
470 if (!CryptSignHash(hash, priv->key_spec, NULL, 0, buf, &len)) {
471 cryptoapi_error("CryptSignHash failed");
472 goto err;
473 }
474
475 for (i = 0; i < len; i++)
476 to[i] = buf[len - i - 1];
477 ret = len;
478
479 err:
480 os_free(buf);
481 CryptDestroyHash(hash);
482
483 return ret;
484 }
485
486
cryptoapi_rsa_priv_dec(int flen,const unsigned char * from,unsigned char * to,RSA * rsa,int padding)487 static int cryptoapi_rsa_priv_dec(int flen, const unsigned char *from,
488 unsigned char *to, RSA *rsa, int padding)
489 {
490 wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
491 return 0;
492 }
493
494
cryptoapi_free_data(struct cryptoapi_rsa_data * priv)495 static void cryptoapi_free_data(struct cryptoapi_rsa_data *priv)
496 {
497 if (priv == NULL)
498 return;
499 if (priv->crypt_prov && priv->free_crypt_prov)
500 CryptReleaseContext(priv->crypt_prov, 0);
501 if (priv->cert)
502 CertFreeCertificateContext(priv->cert);
503 os_free(priv);
504 }
505
506
cryptoapi_finish(RSA * rsa)507 static int cryptoapi_finish(RSA *rsa)
508 {
509 cryptoapi_free_data((struct cryptoapi_rsa_data *) rsa->meth->app_data);
510 os_free((void *) rsa->meth);
511 rsa->meth = NULL;
512 return 1;
513 }
514
515
cryptoapi_find_cert(const char * name,DWORD store)516 static const CERT_CONTEXT * cryptoapi_find_cert(const char *name, DWORD store)
517 {
518 HCERTSTORE cs;
519 const CERT_CONTEXT *ret = NULL;
520
521 cs = CertOpenStore((LPCSTR) CERT_STORE_PROV_SYSTEM, 0, 0,
522 store | CERT_STORE_OPEN_EXISTING_FLAG |
523 CERT_STORE_READONLY_FLAG, L"MY");
524 if (cs == NULL) {
525 cryptoapi_error("Failed to open 'My system store'");
526 return NULL;
527 }
528
529 if (strncmp(name, "cert://", 7) == 0) {
530 unsigned short wbuf[255];
531 MultiByteToWideChar(CP_ACP, 0, name + 7, -1, wbuf, 255);
532 ret = CertFindCertificateInStore(cs, X509_ASN_ENCODING |
533 PKCS_7_ASN_ENCODING,
534 0, CERT_FIND_SUBJECT_STR,
535 wbuf, NULL);
536 } else if (strncmp(name, "hash://", 7) == 0) {
537 CRYPT_HASH_BLOB blob;
538 int len;
539 const char *hash = name + 7;
540 unsigned char *buf;
541
542 len = os_strlen(hash) / 2;
543 buf = os_malloc(len);
544 if (buf && hexstr2bin(hash, buf, len) == 0) {
545 blob.cbData = len;
546 blob.pbData = buf;
547 ret = CertFindCertificateInStore(cs,
548 X509_ASN_ENCODING |
549 PKCS_7_ASN_ENCODING,
550 0, CERT_FIND_HASH,
551 &blob, NULL);
552 }
553 os_free(buf);
554 }
555
556 CertCloseStore(cs, 0);
557
558 return ret;
559 }
560
561
tls_cryptoapi_cert(SSL * ssl,const char * name)562 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
563 {
564 X509 *cert = NULL;
565 RSA *rsa = NULL, *pub_rsa;
566 struct cryptoapi_rsa_data *priv;
567 RSA_METHOD *rsa_meth;
568
569 if (name == NULL ||
570 (strncmp(name, "cert://", 7) != 0 &&
571 strncmp(name, "hash://", 7) != 0))
572 return -1;
573
574 priv = os_zalloc(sizeof(*priv));
575 rsa_meth = os_zalloc(sizeof(*rsa_meth));
576 if (priv == NULL || rsa_meth == NULL) {
577 wpa_printf(MSG_WARNING, "CryptoAPI: Failed to allocate memory "
578 "for CryptoAPI RSA method");
579 os_free(priv);
580 os_free(rsa_meth);
581 return -1;
582 }
583
584 priv->cert = cryptoapi_find_cert(name, CERT_SYSTEM_STORE_CURRENT_USER);
585 if (priv->cert == NULL) {
586 priv->cert = cryptoapi_find_cert(
587 name, CERT_SYSTEM_STORE_LOCAL_MACHINE);
588 }
589 if (priv->cert == NULL) {
590 wpa_printf(MSG_INFO, "CryptoAPI: Could not find certificate "
591 "'%s'", name);
592 goto err;
593 }
594
595 cert = d2i_X509(NULL,
596 (const unsigned char **) &priv->cert->pbCertEncoded,
597 priv->cert->cbCertEncoded);
598 if (cert == NULL) {
599 wpa_printf(MSG_INFO, "CryptoAPI: Could not process X509 DER "
600 "encoding");
601 goto err;
602 }
603
604 if (!CryptAcquireCertificatePrivateKey(priv->cert,
605 CRYPT_ACQUIRE_COMPARE_KEY_FLAG,
606 NULL, &priv->crypt_prov,
607 &priv->key_spec,
608 &priv->free_crypt_prov)) {
609 cryptoapi_error("Failed to acquire a private key for the "
610 "certificate");
611 goto err;
612 }
613
614 rsa_meth->name = "Microsoft CryptoAPI RSA Method";
615 rsa_meth->rsa_pub_enc = cryptoapi_rsa_pub_enc;
616 rsa_meth->rsa_pub_dec = cryptoapi_rsa_pub_dec;
617 rsa_meth->rsa_priv_enc = cryptoapi_rsa_priv_enc;
618 rsa_meth->rsa_priv_dec = cryptoapi_rsa_priv_dec;
619 rsa_meth->finish = cryptoapi_finish;
620 rsa_meth->flags = RSA_METHOD_FLAG_NO_CHECK;
621 rsa_meth->app_data = (char *) priv;
622
623 rsa = RSA_new();
624 if (rsa == NULL) {
625 SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE,
626 ERR_R_MALLOC_FAILURE);
627 goto err;
628 }
629
630 if (!SSL_use_certificate(ssl, cert)) {
631 RSA_free(rsa);
632 rsa = NULL;
633 goto err;
634 }
635 pub_rsa = cert->cert_info->key->pkey->pkey.rsa;
636 X509_free(cert);
637 cert = NULL;
638
639 rsa->n = BN_dup(pub_rsa->n);
640 rsa->e = BN_dup(pub_rsa->e);
641 if (!RSA_set_method(rsa, rsa_meth))
642 goto err;
643
644 if (!SSL_use_RSAPrivateKey(ssl, rsa))
645 goto err;
646 RSA_free(rsa);
647
648 return 0;
649
650 err:
651 if (cert)
652 X509_free(cert);
653 if (rsa)
654 RSA_free(rsa);
655 else {
656 os_free(rsa_meth);
657 cryptoapi_free_data(priv);
658 }
659 return -1;
660 }
661
662
tls_cryptoapi_ca_cert(SSL_CTX * ssl_ctx,SSL * ssl,const char * name)663 static int tls_cryptoapi_ca_cert(SSL_CTX *ssl_ctx, SSL *ssl, const char *name)
664 {
665 HCERTSTORE cs;
666 PCCERT_CONTEXT ctx = NULL;
667 X509 *cert;
668 char buf[128];
669 const char *store;
670 #ifdef UNICODE
671 WCHAR *wstore;
672 #endif /* UNICODE */
673
674 if (name == NULL || strncmp(name, "cert_store://", 13) != 0)
675 return -1;
676
677 store = name + 13;
678 #ifdef UNICODE
679 wstore = os_malloc((os_strlen(store) + 1) * sizeof(WCHAR));
680 if (wstore == NULL)
681 return -1;
682 wsprintf(wstore, L"%S", store);
683 cs = CertOpenSystemStore(0, wstore);
684 os_free(wstore);
685 #else /* UNICODE */
686 cs = CertOpenSystemStore(0, store);
687 #endif /* UNICODE */
688 if (cs == NULL) {
689 wpa_printf(MSG_DEBUG, "%s: failed to open system cert store "
690 "'%s': error=%d", __func__, store,
691 (int) GetLastError());
692 return -1;
693 }
694
695 while ((ctx = CertEnumCertificatesInStore(cs, ctx))) {
696 cert = d2i_X509(NULL,
697 (const unsigned char **) &ctx->pbCertEncoded,
698 ctx->cbCertEncoded);
699 if (cert == NULL) {
700 wpa_printf(MSG_INFO, "CryptoAPI: Could not process "
701 "X509 DER encoding for CA cert");
702 continue;
703 }
704
705 X509_NAME_oneline(X509_get_subject_name(cert), buf,
706 sizeof(buf));
707 wpa_printf(MSG_DEBUG, "OpenSSL: Loaded CA certificate for "
708 "system certificate store: subject='%s'", buf);
709
710 if (!X509_STORE_add_cert(SSL_CTX_get_cert_store(ssl_ctx),
711 cert)) {
712 tls_show_errors(MSG_WARNING, __func__,
713 "Failed to add ca_cert to OpenSSL "
714 "certificate store");
715 }
716
717 X509_free(cert);
718 }
719
720 if (!CertCloseStore(cs, 0)) {
721 wpa_printf(MSG_DEBUG, "%s: failed to close system cert store "
722 "'%s': error=%d", __func__, name + 13,
723 (int) GetLastError());
724 }
725
726 return 0;
727 }
728
729
730 #else /* CONFIG_NATIVE_WINDOWS */
731
tls_cryptoapi_cert(SSL * ssl,const char * name)732 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
733 {
734 return -1;
735 }
736
737 #endif /* CONFIG_NATIVE_WINDOWS */
738
739
ssl_info_cb(const SSL * ssl,int where,int ret)740 static void ssl_info_cb(const SSL *ssl, int where, int ret)
741 {
742 const char *str;
743 int w;
744
745 wpa_printf(MSG_DEBUG, "SSL: (where=0x%x ret=0x%x)", where, ret);
746 w = where & ~SSL_ST_MASK;
747 if (w & SSL_ST_CONNECT)
748 str = "SSL_connect";
749 else if (w & SSL_ST_ACCEPT)
750 str = "SSL_accept";
751 else
752 str = "undefined";
753
754 if (where & SSL_CB_LOOP) {
755 wpa_printf(MSG_DEBUG, "SSL: %s:%s",
756 str, SSL_state_string_long(ssl));
757 } else if (where & SSL_CB_ALERT) {
758 struct tls_connection *conn = SSL_get_app_data((SSL *) ssl);
759 wpa_printf(MSG_INFO, "SSL: SSL3 alert: %s:%s:%s",
760 where & SSL_CB_READ ?
761 "read (remote end reported an error)" :
762 "write (local SSL3 detected an error)",
763 SSL_alert_type_string_long(ret),
764 SSL_alert_desc_string_long(ret));
765 if ((ret >> 8) == SSL3_AL_FATAL) {
766 if (where & SSL_CB_READ)
767 conn->read_alerts++;
768 else
769 conn->write_alerts++;
770 }
771 if (conn->context->event_cb != NULL) {
772 union tls_event_data ev;
773 struct tls_context *context = conn->context;
774 os_memset(&ev, 0, sizeof(ev));
775 ev.alert.is_local = !(where & SSL_CB_READ);
776 ev.alert.type = SSL_alert_type_string_long(ret);
777 ev.alert.description = SSL_alert_desc_string_long(ret);
778 context->event_cb(context->cb_ctx, TLS_ALERT, &ev);
779 }
780 } else if (where & SSL_CB_EXIT && ret <= 0) {
781 wpa_printf(MSG_DEBUG, "SSL: %s:%s in %s",
782 str, ret == 0 ? "failed" : "error",
783 SSL_state_string_long(ssl));
784 }
785 }
786
787
788 #ifndef OPENSSL_NO_ENGINE
789 /**
790 * tls_engine_load_dynamic_generic - load any openssl engine
791 * @pre: an array of commands and values that load an engine initialized
792 * in the engine specific function
793 * @post: an array of commands and values that initialize an already loaded
794 * engine (or %NULL if not required)
795 * @id: the engine id of the engine to load (only required if post is not %NULL
796 *
797 * This function is a generic function that loads any openssl engine.
798 *
799 * Returns: 0 on success, -1 on failure
800 */
tls_engine_load_dynamic_generic(const char * pre[],const char * post[],const char * id)801 static int tls_engine_load_dynamic_generic(const char *pre[],
802 const char *post[], const char *id)
803 {
804 ENGINE *engine;
805 const char *dynamic_id = "dynamic";
806
807 engine = ENGINE_by_id(id);
808 if (engine) {
809 wpa_printf(MSG_DEBUG, "ENGINE: engine '%s' is already "
810 "available", id);
811 /*
812 * If it was auto-loaded by ENGINE_by_id() we might still
813 * need to tell it which PKCS#11 module to use in legacy
814 * (non-p11-kit) environments. Do so now; even if it was
815 * properly initialised before, setting it again will be
816 * harmless.
817 */
818 goto found;
819 }
820 ERR_clear_error();
821
822 engine = ENGINE_by_id(dynamic_id);
823 if (engine == NULL) {
824 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
825 dynamic_id,
826 ERR_error_string(ERR_get_error(), NULL));
827 return -1;
828 }
829
830 /* Perform the pre commands. This will load the engine. */
831 while (pre && pre[0]) {
832 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", pre[0], pre[1]);
833 if (ENGINE_ctrl_cmd_string(engine, pre[0], pre[1], 0) == 0) {
834 wpa_printf(MSG_INFO, "ENGINE: ctrl cmd_string failed: "
835 "%s %s [%s]", pre[0], pre[1],
836 ERR_error_string(ERR_get_error(), NULL));
837 ENGINE_free(engine);
838 return -1;
839 }
840 pre += 2;
841 }
842
843 /*
844 * Free the reference to the "dynamic" engine. The loaded engine can
845 * now be looked up using ENGINE_by_id().
846 */
847 ENGINE_free(engine);
848
849 engine = ENGINE_by_id(id);
850 if (engine == NULL) {
851 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
852 id, ERR_error_string(ERR_get_error(), NULL));
853 return -1;
854 }
855 found:
856 while (post && post[0]) {
857 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", post[0], post[1]);
858 if (ENGINE_ctrl_cmd_string(engine, post[0], post[1], 0) == 0) {
859 wpa_printf(MSG_DEBUG, "ENGINE: ctrl cmd_string failed:"
860 " %s %s [%s]", post[0], post[1],
861 ERR_error_string(ERR_get_error(), NULL));
862 ENGINE_remove(engine);
863 ENGINE_free(engine);
864 return -1;
865 }
866 post += 2;
867 }
868 ENGINE_free(engine);
869
870 return 0;
871 }
872
873
874 /**
875 * tls_engine_load_dynamic_pkcs11 - load the pkcs11 engine provided by opensc
876 * @pkcs11_so_path: pksc11_so_path from the configuration
877 * @pcks11_module_path: pkcs11_module_path from the configuration
878 */
tls_engine_load_dynamic_pkcs11(const char * pkcs11_so_path,const char * pkcs11_module_path)879 static int tls_engine_load_dynamic_pkcs11(const char *pkcs11_so_path,
880 const char *pkcs11_module_path)
881 {
882 char *engine_id = "pkcs11";
883 const char *pre_cmd[] = {
884 "SO_PATH", NULL /* pkcs11_so_path */,
885 "ID", NULL /* engine_id */,
886 "LIST_ADD", "1",
887 /* "NO_VCHECK", "1", */
888 "LOAD", NULL,
889 NULL, NULL
890 };
891 const char *post_cmd[] = {
892 "MODULE_PATH", NULL /* pkcs11_module_path */,
893 NULL, NULL
894 };
895
896 if (!pkcs11_so_path)
897 return 0;
898
899 pre_cmd[1] = pkcs11_so_path;
900 pre_cmd[3] = engine_id;
901 if (pkcs11_module_path)
902 post_cmd[1] = pkcs11_module_path;
903 else
904 post_cmd[0] = NULL;
905
906 wpa_printf(MSG_DEBUG, "ENGINE: Loading pkcs11 Engine from %s",
907 pkcs11_so_path);
908
909 return tls_engine_load_dynamic_generic(pre_cmd, post_cmd, engine_id);
910 }
911
912
913 /**
914 * tls_engine_load_dynamic_opensc - load the opensc engine provided by opensc
915 * @opensc_so_path: opensc_so_path from the configuration
916 */
tls_engine_load_dynamic_opensc(const char * opensc_so_path)917 static int tls_engine_load_dynamic_opensc(const char *opensc_so_path)
918 {
919 char *engine_id = "opensc";
920 const char *pre_cmd[] = {
921 "SO_PATH", NULL /* opensc_so_path */,
922 "ID", NULL /* engine_id */,
923 "LIST_ADD", "1",
924 "LOAD", NULL,
925 NULL, NULL
926 };
927
928 if (!opensc_so_path)
929 return 0;
930
931 pre_cmd[1] = opensc_so_path;
932 pre_cmd[3] = engine_id;
933
934 wpa_printf(MSG_DEBUG, "ENGINE: Loading OpenSC Engine from %s",
935 opensc_so_path);
936
937 return tls_engine_load_dynamic_generic(pre_cmd, NULL, engine_id);
938 }
939 #endif /* OPENSSL_NO_ENGINE */
940
941
get_session_data(struct tls_context * context,const struct wpabuf * buf)942 static struct tls_session_data * get_session_data(struct tls_context *context,
943 const struct wpabuf *buf)
944 {
945 struct tls_session_data *data;
946
947 dl_list_for_each(data, &context->sessions, struct tls_session_data,
948 list) {
949 if (data->buf == buf)
950 return data;
951 }
952
953 return NULL;
954 }
955
956
remove_session_cb(SSL_CTX * ctx,SSL_SESSION * sess)957 static void remove_session_cb(SSL_CTX *ctx, SSL_SESSION *sess)
958 {
959 struct wpabuf *buf;
960 struct tls_context *context;
961 struct tls_session_data *found;
962
963 wpa_printf(MSG_DEBUG,
964 "OpenSSL: Remove session %p (tls_ex_idx_session=%d)", sess,
965 tls_ex_idx_session);
966
967 if (tls_ex_idx_session < 0)
968 return;
969 buf = SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
970 if (!buf)
971 return;
972
973 context = SSL_CTX_get_app_data(ctx);
974 SSL_SESSION_set_ex_data(sess, tls_ex_idx_session, NULL);
975 found = get_session_data(context, buf);
976 if (!found) {
977 wpa_printf(MSG_DEBUG,
978 "OpenSSL: Do not free application session data %p (sess %p)",
979 buf, sess);
980 return;
981 }
982
983 dl_list_del(&found->list);
984 os_free(found);
985 wpa_printf(MSG_DEBUG,
986 "OpenSSL: Free application session data %p (sess %p)",
987 buf, sess);
988 wpabuf_free(buf);
989 }
990
991
tls_init(const struct tls_config * conf)992 void * tls_init(const struct tls_config *conf)
993 {
994 struct tls_data *data;
995 SSL_CTX *ssl;
996 struct tls_context *context;
997 const char *ciphers;
998 #ifndef OPENSSL_NO_ENGINE
999 #ifdef CONFIG_OPENSC_ENGINE_PATH
1000 char const * const opensc_engine_path = CONFIG_OPENSC_ENGINE_PATH;
1001 #else /* CONFIG_OPENSC_ENGINE_PATH */
1002 char const * const opensc_engine_path =
1003 conf ? conf->opensc_engine_path : NULL;
1004 #endif /* CONFIG_OPENSC_ENGINE_PATH */
1005 #ifdef CONFIG_PKCS11_ENGINE_PATH
1006 char const * const pkcs11_engine_path = CONFIG_PKCS11_ENGINE_PATH;
1007 #else /* CONFIG_PKCS11_ENGINE_PATH */
1008 char const * const pkcs11_engine_path =
1009 conf ? conf->pkcs11_engine_path : NULL;
1010 #endif /* CONFIG_PKCS11_ENGINE_PATH */
1011 #ifdef CONFIG_PKCS11_MODULE_PATH
1012 char const * const pkcs11_module_path = CONFIG_PKCS11_MODULE_PATH;
1013 #else /* CONFIG_PKCS11_MODULE_PATH */
1014 char const * const pkcs11_module_path =
1015 conf ? conf->pkcs11_module_path : NULL;
1016 #endif /* CONFIG_PKCS11_MODULE_PATH */
1017 #endif /* OPENSSL_NO_ENGINE */
1018
1019 if (tls_openssl_ref_count == 0) {
1020 void openssl_load_legacy_provider(void);
1021
1022 openssl_load_legacy_provider();
1023
1024 tls_global = context = tls_context_new(conf);
1025 if (context == NULL)
1026 return NULL;
1027 #ifdef CONFIG_FIPS
1028 #ifdef OPENSSL_FIPS
1029 if (conf && conf->fips_mode) {
1030 static int fips_enabled = 0;
1031
1032 if (!fips_enabled && !FIPS_mode_set(1)) {
1033 wpa_printf(MSG_ERROR, "Failed to enable FIPS "
1034 "mode");
1035 ERR_load_crypto_strings();
1036 ERR_print_errors_fp(stderr);
1037 os_free(tls_global);
1038 tls_global = NULL;
1039 return NULL;
1040 } else {
1041 wpa_printf(MSG_INFO, "Running in FIPS mode");
1042 fips_enabled = 1;
1043 }
1044 }
1045 #else /* OPENSSL_FIPS */
1046 if (conf && conf->fips_mode) {
1047 wpa_printf(MSG_ERROR, "FIPS mode requested, but not "
1048 "supported");
1049 os_free(tls_global);
1050 tls_global = NULL;
1051 return NULL;
1052 }
1053 #endif /* OPENSSL_FIPS */
1054 #endif /* CONFIG_FIPS */
1055 #if OPENSSL_VERSION_NUMBER < 0x10100000L
1056 SSL_load_error_strings();
1057 SSL_library_init();
1058 #ifndef OPENSSL_NO_SHA256
1059 EVP_add_digest(EVP_sha256());
1060 #endif /* OPENSSL_NO_SHA256 */
1061 /* TODO: if /dev/urandom is available, PRNG is seeded
1062 * automatically. If this is not the case, random data should
1063 * be added here. */
1064
1065 #ifdef PKCS12_FUNCS
1066 #ifndef OPENSSL_NO_RC2
1067 /*
1068 * 40-bit RC2 is commonly used in PKCS#12 files, so enable it.
1069 * This is enabled by PKCS12_PBE_add() in OpenSSL 0.9.8
1070 * versions, but it looks like OpenSSL 1.0.0 does not do that
1071 * anymore.
1072 */
1073 EVP_add_cipher(EVP_rc2_40_cbc());
1074 #endif /* OPENSSL_NO_RC2 */
1075 PKCS12_PBE_add();
1076 #endif /* PKCS12_FUNCS */
1077 #endif /* < 1.1.0 */
1078 } else {
1079 context = tls_context_new(conf);
1080 if (context == NULL)
1081 return NULL;
1082 }
1083 tls_openssl_ref_count++;
1084
1085 data = os_zalloc(sizeof(*data));
1086 if (data)
1087 ssl = SSL_CTX_new(SSLv23_method());
1088 else
1089 ssl = NULL;
1090 if (ssl == NULL) {
1091 tls_openssl_ref_count--;
1092 if (context != tls_global)
1093 os_free(context);
1094 if (tls_openssl_ref_count == 0) {
1095 os_free(tls_global);
1096 tls_global = NULL;
1097 }
1098 os_free(data);
1099 return NULL;
1100 }
1101 data->ssl = ssl;
1102 if (conf) {
1103 data->tls_session_lifetime = conf->tls_session_lifetime;
1104 data->crl_reload_interval = conf->crl_reload_interval;
1105 }
1106
1107 SSL_CTX_set_options(ssl, SSL_OP_NO_SSLv2);
1108 SSL_CTX_set_options(ssl, SSL_OP_NO_SSLv3);
1109
1110 SSL_CTX_set_mode(ssl, SSL_MODE_AUTO_RETRY);
1111
1112 #ifdef SSL_MODE_NO_AUTO_CHAIN
1113 /* Number of deployed use cases assume the default OpenSSL behavior of
1114 * auto chaining the local certificate is in use. BoringSSL removed this
1115 * functionality by default, so we need to restore it here to avoid
1116 * breaking existing use cases. */
1117 SSL_CTX_clear_mode(ssl, SSL_MODE_NO_AUTO_CHAIN);
1118 #endif /* SSL_MODE_NO_AUTO_CHAIN */
1119
1120 SSL_CTX_set_info_callback(ssl, ssl_info_cb);
1121 SSL_CTX_set_app_data(ssl, context);
1122 if (data->tls_session_lifetime > 0) {
1123 SSL_CTX_set_quiet_shutdown(ssl, 1);
1124 /*
1125 * Set default context here. In practice, this will be replaced
1126 * by the per-EAP method context in tls_connection_set_verify().
1127 */
1128 SSL_CTX_set_session_id_context(ssl, (u8 *) "hostapd", 7);
1129 SSL_CTX_set_session_cache_mode(ssl, SSL_SESS_CACHE_SERVER);
1130 SSL_CTX_set_timeout(ssl, data->tls_session_lifetime);
1131 SSL_CTX_sess_set_remove_cb(ssl, remove_session_cb);
1132 #if OPENSSL_VERSION_NUMBER >= 0x10101000L && \
1133 !defined(LIBRESSL_VERSION_NUMBER) && \
1134 !defined(OPENSSL_IS_BORINGSSL)
1135 /* One session ticket is sufficient for EAP-TLS */
1136 SSL_CTX_set_num_tickets(ssl, 1);
1137 #endif
1138 } else {
1139 SSL_CTX_set_session_cache_mode(ssl, SSL_SESS_CACHE_OFF);
1140 #if OPENSSL_VERSION_NUMBER >= 0x10101000L && \
1141 !defined(LIBRESSL_VERSION_NUMBER) && \
1142 !defined(OPENSSL_IS_BORINGSSL)
1143 SSL_CTX_set_num_tickets(ssl, 0);
1144 #endif
1145 }
1146
1147 if (tls_ex_idx_session < 0) {
1148 tls_ex_idx_session = SSL_SESSION_get_ex_new_index(
1149 0, NULL, NULL, NULL, NULL);
1150 if (tls_ex_idx_session < 0) {
1151 tls_deinit(data);
1152 return NULL;
1153 }
1154 }
1155
1156 #ifndef OPENSSL_NO_ENGINE
1157 wpa_printf(MSG_DEBUG, "ENGINE: Loading builtin engines");
1158 ENGINE_load_builtin_engines();
1159
1160 if (opensc_engine_path || pkcs11_engine_path || pkcs11_module_path) {
1161 if (tls_engine_load_dynamic_opensc(opensc_engine_path) ||
1162 tls_engine_load_dynamic_pkcs11(pkcs11_engine_path,
1163 pkcs11_module_path)) {
1164 tls_deinit(data);
1165 return NULL;
1166 }
1167 }
1168 #endif /* OPENSSL_NO_ENGINE */
1169
1170 if (conf && conf->openssl_ciphers)
1171 ciphers = conf->openssl_ciphers;
1172 else
1173 ciphers = TLS_DEFAULT_CIPHERS;
1174 if (SSL_CTX_set_cipher_list(ssl, ciphers) != 1) {
1175 wpa_printf(MSG_ERROR,
1176 "OpenSSL: Failed to set cipher string '%s'",
1177 ciphers);
1178 tls_deinit(data);
1179 return NULL;
1180 }
1181
1182 return data;
1183 }
1184
1185
tls_deinit(void * ssl_ctx)1186 void tls_deinit(void *ssl_ctx)
1187 {
1188 struct tls_data *data = ssl_ctx;
1189 SSL_CTX *ssl = data->ssl;
1190 struct tls_context *context = SSL_CTX_get_app_data(ssl);
1191 struct tls_session_data *sess_data;
1192
1193 if (data->tls_session_lifetime > 0) {
1194 wpa_printf(MSG_DEBUG, "OpenSSL: Flush sessions");
1195 SSL_CTX_flush_sessions(ssl, 0);
1196 wpa_printf(MSG_DEBUG, "OpenSSL: Flush sessions - done");
1197 }
1198 while ((sess_data = dl_list_first(&context->sessions,
1199 struct tls_session_data, list))) {
1200 wpa_printf(MSG_DEBUG,
1201 "OpenSSL: Freeing not-flushed session data %p",
1202 sess_data->buf);
1203 wpabuf_free(sess_data->buf);
1204 dl_list_del(&sess_data->list);
1205 os_free(sess_data);
1206 }
1207 if (context != tls_global)
1208 os_free(context);
1209 os_free(data->ca_cert);
1210 SSL_CTX_free(ssl);
1211
1212 tls_openssl_ref_count--;
1213 if (tls_openssl_ref_count == 0) {
1214 #if OPENSSL_VERSION_NUMBER < 0x10100000L
1215 #ifndef OPENSSL_NO_ENGINE
1216 ENGINE_cleanup();
1217 #endif /* OPENSSL_NO_ENGINE */
1218 CRYPTO_cleanup_all_ex_data();
1219 ERR_remove_thread_state(NULL);
1220 ERR_free_strings();
1221 EVP_cleanup();
1222 #endif /* < 1.1.0 */
1223 os_free(tls_global->ocsp_stapling_response);
1224 tls_global->ocsp_stapling_response = NULL;
1225 os_free(tls_global);
1226 tls_global = NULL;
1227 }
1228
1229 os_free(data->check_cert_subject);
1230 os_free(data->openssl_ciphers);
1231 os_free(data);
1232 }
1233
1234
1235 #ifndef OPENSSL_NO_ENGINE
1236
1237 /* Cryptoki return values */
1238 #define CKR_PIN_INCORRECT 0x000000a0
1239 #define CKR_PIN_INVALID 0x000000a1
1240 #define CKR_PIN_LEN_RANGE 0x000000a2
1241
1242 /* libp11 */
1243 #define ERR_LIB_PKCS11 ERR_LIB_USER
1244
tls_is_pin_error(unsigned int err)1245 static int tls_is_pin_error(unsigned int err)
1246 {
1247 return ERR_GET_LIB(err) == ERR_LIB_PKCS11 &&
1248 (ERR_GET_REASON(err) == CKR_PIN_INCORRECT ||
1249 ERR_GET_REASON(err) == CKR_PIN_INVALID ||
1250 ERR_GET_REASON(err) == CKR_PIN_LEN_RANGE);
1251 }
1252
1253 #endif /* OPENSSL_NO_ENGINE */
1254
1255
1256 #ifdef ANDROID
1257 /* EVP_PKEY_from_keystore comes from system/security/keystore-engine. */
1258 EVP_PKEY * EVP_PKEY_from_keystore(const char *key_id);
1259 #endif /* ANDROID */
1260
tls_engine_init(struct tls_connection * conn,const char * engine_id,const char * pin,const char * key_id,const char * cert_id,const char * ca_cert_id)1261 static int tls_engine_init(struct tls_connection *conn, const char *engine_id,
1262 const char *pin, const char *key_id,
1263 const char *cert_id, const char *ca_cert_id)
1264 {
1265 #if defined(ANDROID) && defined(OPENSSL_IS_BORINGSSL)
1266 #if !defined(OPENSSL_NO_ENGINE)
1267 #error "This code depends on OPENSSL_NO_ENGINE being defined by BoringSSL."
1268 #endif
1269 if (!key_id)
1270 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1271 conn->engine = NULL;
1272 conn->private_key = EVP_PKEY_from_keystore(key_id);
1273 if (!conn->private_key) {
1274 wpa_printf(MSG_ERROR,
1275 "ENGINE: cannot load private key with id '%s' [%s]",
1276 key_id,
1277 ERR_error_string(ERR_get_error(), NULL));
1278 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1279 }
1280 #endif /* ANDROID && OPENSSL_IS_BORINGSSL */
1281
1282 #ifndef OPENSSL_NO_ENGINE
1283 int ret = -1;
1284 if (engine_id == NULL) {
1285 wpa_printf(MSG_ERROR, "ENGINE: Engine ID not set");
1286 return -1;
1287 }
1288
1289 ERR_clear_error();
1290 #ifdef ANDROID
1291 ENGINE_load_dynamic();
1292 #endif
1293 conn->engine = ENGINE_by_id(engine_id);
1294 if (!conn->engine) {
1295 wpa_printf(MSG_ERROR, "ENGINE: engine %s not available [%s]",
1296 engine_id, ERR_error_string(ERR_get_error(), NULL));
1297 goto err;
1298 }
1299 if (ENGINE_init(conn->engine) != 1) {
1300 wpa_printf(MSG_ERROR, "ENGINE: engine init failed "
1301 "(engine: %s) [%s]", engine_id,
1302 ERR_error_string(ERR_get_error(), NULL));
1303 goto err;
1304 }
1305 wpa_printf(MSG_DEBUG, "ENGINE: engine initialized");
1306
1307 #ifndef ANDROID
1308 if (pin && ENGINE_ctrl_cmd_string(conn->engine, "PIN", pin, 0) == 0) {
1309 wpa_printf(MSG_ERROR, "ENGINE: cannot set pin [%s]",
1310 ERR_error_string(ERR_get_error(), NULL));
1311 goto err;
1312 }
1313 #endif
1314 if (key_id) {
1315 /*
1316 * Ensure that the ENGINE does not attempt to use the OpenSSL
1317 * UI system to obtain a PIN, if we didn't provide one.
1318 */
1319 struct {
1320 const void *password;
1321 const char *prompt_info;
1322 } key_cb = { "", NULL };
1323
1324 /* load private key first in-case PIN is required for cert */
1325 conn->private_key = ENGINE_load_private_key(conn->engine,
1326 key_id, NULL,
1327 &key_cb);
1328 if (!conn->private_key) {
1329 unsigned long err = ERR_get_error();
1330
1331 wpa_printf(MSG_ERROR,
1332 "ENGINE: cannot load private key with id '%s' [%s]",
1333 key_id,
1334 ERR_error_string(err, NULL));
1335 if (tls_is_pin_error(err))
1336 ret = TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN;
1337 else
1338 ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1339 goto err;
1340 }
1341 }
1342
1343 /* handle a certificate and/or CA certificate */
1344 if (cert_id || ca_cert_id) {
1345 const char *cmd_name = "LOAD_CERT_CTRL";
1346
1347 /* test if the engine supports a LOAD_CERT_CTRL */
1348 if (!ENGINE_ctrl(conn->engine, ENGINE_CTRL_GET_CMD_FROM_NAME,
1349 0, (void *)cmd_name, NULL)) {
1350 wpa_printf(MSG_ERROR, "ENGINE: engine does not support"
1351 " loading certificates");
1352 ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1353 goto err;
1354 }
1355 }
1356
1357 return 0;
1358
1359 err:
1360 if (conn->engine) {
1361 ENGINE_free(conn->engine);
1362 conn->engine = NULL;
1363 }
1364
1365 if (conn->private_key) {
1366 EVP_PKEY_free(conn->private_key);
1367 conn->private_key = NULL;
1368 }
1369
1370 return ret;
1371 #else /* OPENSSL_NO_ENGINE */
1372 return 0;
1373 #endif /* OPENSSL_NO_ENGINE */
1374 }
1375
1376
tls_engine_deinit(struct tls_connection * conn)1377 static void tls_engine_deinit(struct tls_connection *conn)
1378 {
1379 #if defined(ANDROID) || !defined(OPENSSL_NO_ENGINE)
1380 wpa_printf(MSG_DEBUG, "ENGINE: engine deinit");
1381 if (conn->private_key) {
1382 EVP_PKEY_free(conn->private_key);
1383 conn->private_key = NULL;
1384 }
1385 if (conn->engine) {
1386 #if !defined(OPENSSL_IS_BORINGSSL)
1387 ENGINE_finish(conn->engine);
1388 #endif /* !OPENSSL_IS_BORINGSSL */
1389 conn->engine = NULL;
1390 }
1391 #endif /* ANDROID || !OPENSSL_NO_ENGINE */
1392 }
1393
1394
tls_get_errors(void * ssl_ctx)1395 int tls_get_errors(void *ssl_ctx)
1396 {
1397 int count = 0;
1398 unsigned long err;
1399
1400 while ((err = ERR_get_error())) {
1401 wpa_printf(MSG_INFO, "TLS - SSL error: %s",
1402 ERR_error_string(err, NULL));
1403 count++;
1404 }
1405
1406 return count;
1407 }
1408
1409
openssl_content_type(int content_type)1410 static const char * openssl_content_type(int content_type)
1411 {
1412 switch (content_type) {
1413 case 20:
1414 return "change cipher spec";
1415 case 21:
1416 return "alert";
1417 case 22:
1418 return "handshake";
1419 case 23:
1420 return "application data";
1421 case 24:
1422 return "heartbeat";
1423 case 256:
1424 return "TLS header info"; /* pseudo content type */
1425 case 257:
1426 return "inner content type"; /* pseudo content type */
1427 default:
1428 return "?";
1429 }
1430 }
1431
1432
openssl_handshake_type(int content_type,const u8 * buf,size_t len)1433 static const char * openssl_handshake_type(int content_type, const u8 *buf,
1434 size_t len)
1435 {
1436 if (content_type == 257 && buf && len == 1)
1437 return openssl_content_type(buf[0]);
1438 if (content_type != 22 || !buf || len == 0)
1439 return "";
1440 switch (buf[0]) {
1441 case 0:
1442 return "hello request";
1443 case 1:
1444 return "client hello";
1445 case 2:
1446 return "server hello";
1447 case 3:
1448 return "hello verify request";
1449 case 4:
1450 return "new session ticket";
1451 case 5:
1452 return "end of early data";
1453 case 6:
1454 return "hello retry request";
1455 case 8:
1456 return "encrypted extensions";
1457 case 11:
1458 return "certificate";
1459 case 12:
1460 return "server key exchange";
1461 case 13:
1462 return "certificate request";
1463 case 14:
1464 return "server hello done";
1465 case 15:
1466 return "certificate verify";
1467 case 16:
1468 return "client key exchange";
1469 case 20:
1470 return "finished";
1471 case 21:
1472 return "certificate url";
1473 case 22:
1474 return "certificate status";
1475 case 23:
1476 return "supplemental data";
1477 case 24:
1478 return "key update";
1479 case 254:
1480 return "message hash";
1481 default:
1482 return "?";
1483 }
1484 }
1485
1486
1487 #ifdef CONFIG_SUITEB
1488
check_server_hello(struct tls_connection * conn,const u8 * pos,const u8 * end)1489 static void check_server_hello(struct tls_connection *conn,
1490 const u8 *pos, const u8 *end)
1491 {
1492 size_t payload_len, id_len;
1493
1494 /*
1495 * Parse ServerHello to get the selected cipher suite since OpenSSL does
1496 * not make it cleanly available during handshake and we need to know
1497 * whether DHE was selected.
1498 */
1499
1500 if (end - pos < 3)
1501 return;
1502 payload_len = WPA_GET_BE24(pos);
1503 pos += 3;
1504
1505 if ((size_t) (end - pos) < payload_len)
1506 return;
1507 end = pos + payload_len;
1508
1509 /* Skip Version and Random */
1510 if (end - pos < 2 + SSL3_RANDOM_SIZE)
1511 return;
1512 pos += 2 + SSL3_RANDOM_SIZE;
1513
1514 /* Skip Session ID */
1515 if (end - pos < 1)
1516 return;
1517 id_len = *pos++;
1518 if ((size_t) (end - pos) < id_len)
1519 return;
1520 pos += id_len;
1521
1522 if (end - pos < 2)
1523 return;
1524 conn->cipher_suite = WPA_GET_BE16(pos);
1525 wpa_printf(MSG_DEBUG, "OpenSSL: Server selected cipher suite 0x%x",
1526 conn->cipher_suite);
1527 }
1528
1529
check_server_key_exchange(SSL * ssl,struct tls_connection * conn,const u8 * pos,const u8 * end)1530 static void check_server_key_exchange(SSL *ssl, struct tls_connection *conn,
1531 const u8 *pos, const u8 *end)
1532 {
1533 size_t payload_len;
1534 u16 dh_len;
1535 BIGNUM *p;
1536 int bits;
1537
1538 if (!(conn->flags & TLS_CONN_SUITEB))
1539 return;
1540
1541 /* DHE is enabled only with DHE-RSA-AES256-GCM-SHA384 */
1542 if (conn->cipher_suite != 0x9f)
1543 return;
1544
1545 if (end - pos < 3)
1546 return;
1547 payload_len = WPA_GET_BE24(pos);
1548 pos += 3;
1549
1550 if ((size_t) (end - pos) < payload_len)
1551 return;
1552 end = pos + payload_len;
1553
1554 if (end - pos < 2)
1555 return;
1556 dh_len = WPA_GET_BE16(pos);
1557 pos += 2;
1558
1559 if ((size_t) (end - pos) < dh_len)
1560 return;
1561 p = BN_bin2bn(pos, dh_len, NULL);
1562 if (!p)
1563 return;
1564
1565 bits = BN_num_bits(p);
1566 BN_free(p);
1567
1568 conn->server_dh_prime_len = bits;
1569 wpa_printf(MSG_DEBUG, "OpenSSL: Server DH prime length: %d bits",
1570 conn->server_dh_prime_len);
1571 }
1572
1573 #endif /* CONFIG_SUITEB */
1574
1575
tls_msg_cb(int write_p,int version,int content_type,const void * buf,size_t len,SSL * ssl,void * arg)1576 static void tls_msg_cb(int write_p, int version, int content_type,
1577 const void *buf, size_t len, SSL *ssl, void *arg)
1578 {
1579 struct tls_connection *conn = arg;
1580 const u8 *pos = buf;
1581
1582 #if OPENSSL_VERSION_NUMBER >= 0x30000000L
1583 if ((SSL_version(ssl) == TLS1_VERSION ||
1584 SSL_version(ssl) == TLS1_1_VERSION) &&
1585 SSL_get_security_level(ssl) > 0) {
1586 wpa_printf(MSG_DEBUG,
1587 "OpenSSL: Drop security level to 0 to allow TLS 1.0/1.1 use of MD5-SHA1 signature algorithm");
1588 SSL_set_security_level(ssl, 0);
1589 }
1590 #endif /* OpenSSL version >= 3.0 */
1591 if (write_p == 2) {
1592 wpa_printf(MSG_DEBUG,
1593 "OpenSSL: session ver=0x%x content_type=%d",
1594 version, content_type);
1595 wpa_hexdump_key(MSG_MSGDUMP, "OpenSSL: Data", buf, len);
1596 return;
1597 }
1598
1599 wpa_printf(MSG_DEBUG, "OpenSSL: %s ver=0x%x content_type=%d (%s/%s)",
1600 write_p ? "TX" : "RX", version, content_type,
1601 openssl_content_type(content_type),
1602 openssl_handshake_type(content_type, buf, len));
1603 wpa_hexdump_key(MSG_MSGDUMP, "OpenSSL: Message", buf, len);
1604 if (content_type == 24 && len >= 3 && pos[0] == 1) {
1605 size_t payload_len = WPA_GET_BE16(pos + 1);
1606 if (payload_len + 3 > len) {
1607 wpa_printf(MSG_ERROR, "OpenSSL: Heartbeat attack detected");
1608 conn->invalid_hb_used = 1;
1609 }
1610 }
1611
1612 #ifdef CONFIG_SUITEB
1613 /*
1614 * Need to parse these handshake messages to be able to check DH prime
1615 * length since OpenSSL does not expose the new cipher suite and DH
1616 * parameters during handshake (e.g., for cert_cb() callback).
1617 */
1618 if (content_type == 22 && pos && len > 0 && pos[0] == 2)
1619 check_server_hello(conn, pos + 1, pos + len);
1620 if (content_type == 22 && pos && len > 0 && pos[0] == 12)
1621 check_server_key_exchange(ssl, conn, pos + 1, pos + len);
1622 #endif /* CONFIG_SUITEB */
1623 }
1624
1625
1626 #ifdef CONFIG_TESTING_OPTIONS
1627 #if OPENSSL_VERSION_NUMBER >= 0x10101000L && !defined(LIBRESSL_VERSION_NUMBER)
1628 /*
1629 * By setting the environment variable SSLKEYLOGFILE to a filename keying
1630 * material will be exported that you may use with Wireshark to decode any
1631 * TLS flows. Please see the following for more details:
1632 *
1633 * https://gitlab.com/wireshark/wireshark/-/wikis/TLS#tls-decryption
1634 *
1635 * Example logging sessions are (you should delete the file on each run):
1636 *
1637 * rm -f /tmp/sslkey.log
1638 * env SSLKEYLOGFILE=/tmp/sslkey.log hostapd ...
1639 *
1640 * rm -f /tmp/sslkey.log
1641 * env SSLKEYLOGFILE=/tmp/sslkey.log wpa_supplicant ...
1642 *
1643 * rm -f /tmp/sslkey.log
1644 * env SSLKEYLOGFILE=/tmp/sslkey.log eapol_test ...
1645 */
tls_keylog_cb(const SSL * ssl,const char * line)1646 static void tls_keylog_cb(const SSL *ssl, const char *line)
1647 {
1648 int fd;
1649 const char *filename;
1650 struct iovec iov[2];
1651
1652 filename = getenv("SSLKEYLOGFILE");
1653 if (!filename)
1654 return;
1655
1656 fd = open(filename, O_WRONLY | O_CREAT | O_APPEND, S_IRUSR | S_IWUSR);
1657 if (fd < 0) {
1658 wpa_printf(MSG_ERROR,
1659 "OpenSSL: Failed to open keylog file %s: %s",
1660 filename, strerror(errno));
1661 return;
1662 }
1663
1664 /* Assume less than _POSIX_PIPE_BUF (512) where writes are guaranteed
1665 * to be atomic for O_APPEND. */
1666 iov[0].iov_base = (void *) line;
1667 iov[0].iov_len = os_strlen(line);
1668 iov[1].iov_base = "\n";
1669 iov[1].iov_len = 1;
1670
1671 if (writev(fd, iov, ARRAY_SIZE(iov)) < 01) {
1672 wpa_printf(MSG_DEBUG,
1673 "OpenSSL: Failed to write to keylog file %s: %s",
1674 filename, strerror(errno));
1675 }
1676
1677 close(fd);
1678 }
1679 #endif
1680 #endif /* CONFIG_TESTING_OPTIONS */
1681
1682
tls_connection_init(void * ssl_ctx)1683 struct tls_connection * tls_connection_init(void *ssl_ctx)
1684 {
1685 struct tls_data *data = ssl_ctx;
1686 SSL_CTX *ssl = data->ssl;
1687 struct tls_connection *conn;
1688 long options;
1689 X509_STORE *new_cert_store;
1690 struct os_reltime now;
1691 struct tls_context *context = SSL_CTX_get_app_data(ssl);
1692
1693 /* Replace X509 store if it is time to update CRL. */
1694 if (data->crl_reload_interval > 0 && os_get_reltime(&now) == 0 &&
1695 os_reltime_expired(&now, &data->crl_last_reload,
1696 data->crl_reload_interval)) {
1697 wpa_printf(MSG_INFO,
1698 "OpenSSL: Flushing X509 store with ca_cert file");
1699 new_cert_store = tls_crl_cert_reload(data->ca_cert,
1700 data->check_crl);
1701 if (!new_cert_store) {
1702 wpa_printf(MSG_ERROR,
1703 "OpenSSL: Error replacing X509 store with ca_cert file");
1704 } else {
1705 /* Replace old store */
1706 SSL_CTX_set_cert_store(ssl, new_cert_store);
1707 data->crl_last_reload = now;
1708 }
1709 }
1710
1711 conn = os_zalloc(sizeof(*conn));
1712 if (conn == NULL)
1713 return NULL;
1714 conn->data = data;
1715 conn->ssl_ctx = ssl;
1716 conn->ssl = SSL_new(ssl);
1717 if (conn->ssl == NULL) {
1718 tls_show_errors(MSG_INFO, __func__,
1719 "Failed to initialize new SSL connection");
1720 os_free(conn);
1721 return NULL;
1722 }
1723
1724 conn->context = context;
1725 SSL_set_app_data(conn->ssl, conn);
1726 SSL_set_msg_callback(conn->ssl, tls_msg_cb);
1727 SSL_set_msg_callback_arg(conn->ssl, conn);
1728 options = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
1729 SSL_OP_SINGLE_DH_USE;
1730 #ifdef SSL_OP_NO_COMPRESSION
1731 options |= SSL_OP_NO_COMPRESSION;
1732 #endif /* SSL_OP_NO_COMPRESSION */
1733 SSL_set_options(conn->ssl, options);
1734 #ifdef SSL_OP_ENABLE_MIDDLEBOX_COMPAT
1735 /* Hopefully there is no need for middlebox compatibility mechanisms
1736 * when going through EAP authentication. */
1737 SSL_clear_options(conn->ssl, SSL_OP_ENABLE_MIDDLEBOX_COMPAT);
1738 #endif
1739
1740 #ifdef CONFIG_TESTING_OPTIONS
1741 #if OPENSSL_VERSION_NUMBER >= 0x10101000L && !defined(LIBRESSL_VERSION_NUMBER)
1742 /* Set the keylog file if the admin requested it. */
1743 if (getenv("SSLKEYLOGFILE"))
1744 SSL_CTX_set_keylog_callback(conn->ssl_ctx, tls_keylog_cb);
1745 #endif
1746 #endif /* CONFIG_TESTING_OPTIONS */
1747
1748 conn->ssl_in = BIO_new(BIO_s_mem());
1749 if (!conn->ssl_in) {
1750 tls_show_errors(MSG_INFO, __func__,
1751 "Failed to create a new BIO for ssl_in");
1752 SSL_free(conn->ssl);
1753 os_free(conn);
1754 return NULL;
1755 }
1756
1757 conn->ssl_out = BIO_new(BIO_s_mem());
1758 if (!conn->ssl_out) {
1759 tls_show_errors(MSG_INFO, __func__,
1760 "Failed to create a new BIO for ssl_out");
1761 SSL_free(conn->ssl);
1762 BIO_free(conn->ssl_in);
1763 os_free(conn);
1764 return NULL;
1765 }
1766
1767 SSL_set_bio(conn->ssl, conn->ssl_in, conn->ssl_out);
1768
1769 return conn;
1770 }
1771
1772
tls_connection_deinit(void * ssl_ctx,struct tls_connection * conn)1773 void tls_connection_deinit(void *ssl_ctx, struct tls_connection *conn)
1774 {
1775 if (conn == NULL)
1776 return;
1777 if (conn->success_data) {
1778 /*
1779 * Make sure ssl_clear_bad_session() does not remove this
1780 * session.
1781 */
1782 SSL_set_quiet_shutdown(conn->ssl, 1);
1783 SSL_shutdown(conn->ssl);
1784 }
1785 SSL_free(conn->ssl);
1786 tls_engine_deinit(conn);
1787 os_free(conn->subject_match);
1788 os_free(conn->altsubject_match);
1789 os_free(conn->suffix_match);
1790 os_free(conn->domain_match);
1791 os_free(conn->check_cert_subject);
1792 os_free(conn->session_ticket);
1793 os_free(conn->peer_subject);
1794 os_free(conn);
1795 }
1796
1797
tls_connection_established(void * ssl_ctx,struct tls_connection * conn)1798 int tls_connection_established(void *ssl_ctx, struct tls_connection *conn)
1799 {
1800 return conn ? SSL_is_init_finished(conn->ssl) : 0;
1801 }
1802
1803
tls_connection_peer_serial_num(void * tls_ctx,struct tls_connection * conn)1804 char * tls_connection_peer_serial_num(void *tls_ctx,
1805 struct tls_connection *conn)
1806 {
1807 ASN1_INTEGER *ser;
1808 char *serial_num;
1809 size_t len;
1810
1811 if (!conn->peer_cert)
1812 return NULL;
1813
1814 ser = X509_get_serialNumber(conn->peer_cert);
1815 if (!ser)
1816 return NULL;
1817
1818 len = ASN1_STRING_length(ser) * 2 + 1;
1819 serial_num = os_malloc(len);
1820 if (!serial_num)
1821 return NULL;
1822 wpa_snprintf_hex_uppercase(serial_num, len,
1823 ASN1_STRING_get0_data(ser),
1824 ASN1_STRING_length(ser));
1825 return serial_num;
1826 }
1827
1828
tls_connection_shutdown(void * ssl_ctx,struct tls_connection * conn)1829 int tls_connection_shutdown(void *ssl_ctx, struct tls_connection *conn)
1830 {
1831 if (conn == NULL)
1832 return -1;
1833
1834 /* Shutdown previous TLS connection without notifying the peer
1835 * because the connection was already terminated in practice
1836 * and "close notify" shutdown alert would confuse AS. */
1837 SSL_set_quiet_shutdown(conn->ssl, 1);
1838 SSL_shutdown(conn->ssl);
1839 return SSL_clear(conn->ssl) == 1 ? 0 : -1;
1840 }
1841
1842
tls_match_altsubject_component(X509 * cert,int type,const char * value,size_t len)1843 static int tls_match_altsubject_component(X509 *cert, int type,
1844 const char *value, size_t len)
1845 {
1846 GENERAL_NAME *gen;
1847 void *ext;
1848 int found = 0;
1849 stack_index_t i;
1850
1851 ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
1852
1853 for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
1854 gen = sk_GENERAL_NAME_value(ext, i);
1855 if (gen->type != type)
1856 continue;
1857 if (os_strlen((char *) gen->d.ia5->data) == len &&
1858 os_memcmp(value, gen->d.ia5->data, len) == 0)
1859 found++;
1860 }
1861
1862 sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
1863
1864 return found;
1865 }
1866
1867
tls_match_altsubject(X509 * cert,const char * match)1868 static int tls_match_altsubject(X509 *cert, const char *match)
1869 {
1870 int type;
1871 const char *pos, *end;
1872 size_t len;
1873
1874 pos = match;
1875 do {
1876 if (os_strncmp(pos, "EMAIL:", 6) == 0) {
1877 type = GEN_EMAIL;
1878 pos += 6;
1879 } else if (os_strncmp(pos, "DNS:", 4) == 0) {
1880 type = GEN_DNS;
1881 pos += 4;
1882 } else if (os_strncmp(pos, "URI:", 4) == 0) {
1883 type = GEN_URI;
1884 pos += 4;
1885 } else {
1886 wpa_printf(MSG_INFO, "TLS: Invalid altSubjectName "
1887 "match '%s'", pos);
1888 return 0;
1889 }
1890 end = os_strchr(pos, ';');
1891 while (end) {
1892 if (os_strncmp(end + 1, "EMAIL:", 6) == 0 ||
1893 os_strncmp(end + 1, "DNS:", 4) == 0 ||
1894 os_strncmp(end + 1, "URI:", 4) == 0)
1895 break;
1896 end = os_strchr(end + 1, ';');
1897 }
1898 if (end)
1899 len = end - pos;
1900 else
1901 len = os_strlen(pos);
1902 if (tls_match_altsubject_component(cert, type, pos, len) > 0)
1903 return 1;
1904 pos = end + 1;
1905 } while (end);
1906
1907 return 0;
1908 }
1909
1910
1911 #ifndef CONFIG_NATIVE_WINDOWS
domain_suffix_match(const u8 * val,size_t len,const char * match,size_t match_len,int full)1912 static int domain_suffix_match(const u8 *val, size_t len, const char *match,
1913 size_t match_len, int full)
1914 {
1915 size_t i;
1916
1917 /* Check for embedded nuls that could mess up suffix matching */
1918 for (i = 0; i < len; i++) {
1919 if (val[i] == '\0') {
1920 wpa_printf(MSG_DEBUG, "TLS: Embedded null in a string - reject");
1921 return 0;
1922 }
1923 }
1924
1925 if (match_len > len || (full && match_len != len))
1926 return 0;
1927
1928 if (os_strncasecmp((const char *) val + len - match_len, match,
1929 match_len) != 0)
1930 return 0; /* no match */
1931
1932 if (match_len == len)
1933 return 1; /* exact match */
1934
1935 if (val[len - match_len - 1] == '.')
1936 return 1; /* full label match completes suffix match */
1937
1938 wpa_printf(MSG_DEBUG, "TLS: Reject due to incomplete label match");
1939 return 0;
1940 }
1941 #endif /* CONFIG_NATIVE_WINDOWS */
1942
1943
1944 struct tls_dn_field_order_cnt {
1945 u8 cn;
1946 u8 c;
1947 u8 l;
1948 u8 st;
1949 u8 o;
1950 u8 ou;
1951 u8 email;
1952 };
1953
1954
get_dn_field_index(const struct tls_dn_field_order_cnt * dn_cnt,int nid)1955 static int get_dn_field_index(const struct tls_dn_field_order_cnt *dn_cnt,
1956 int nid)
1957 {
1958 switch (nid) {
1959 case NID_commonName:
1960 return dn_cnt->cn;
1961 case NID_countryName:
1962 return dn_cnt->c;
1963 case NID_localityName:
1964 return dn_cnt->l;
1965 case NID_stateOrProvinceName:
1966 return dn_cnt->st;
1967 case NID_organizationName:
1968 return dn_cnt->o;
1969 case NID_organizationalUnitName:
1970 return dn_cnt->ou;
1971 case NID_pkcs9_emailAddress:
1972 return dn_cnt->email;
1973 default:
1974 wpa_printf(MSG_ERROR,
1975 "TLS: Unknown NID '%d' in check_cert_subject",
1976 nid);
1977 return -1;
1978 }
1979 }
1980
1981
1982 /**
1983 * match_dn_field - Match configuration DN field against Certificate DN field
1984 * @cert: Certificate
1985 * @nid: NID of DN field
1986 * @field: Field name
1987 * @value DN field value which is passed from configuration
1988 * e.g., if configuration have C=US and this argument will point to US.
1989 * @dn_cnt: DN matching context
1990 * Returns: 1 on success and 0 on failure
1991 */
match_dn_field(const X509 * cert,int nid,const char * field,const char * value,const struct tls_dn_field_order_cnt * dn_cnt)1992 static int match_dn_field(const X509 *cert, int nid, const char *field,
1993 const char *value,
1994 const struct tls_dn_field_order_cnt *dn_cnt)
1995 {
1996 int i, ret = 0, len, config_dn_field_index, match_index = 0;
1997 X509_NAME *name;
1998
1999 len = os_strlen(value);
2000 name = X509_get_subject_name((X509 *) cert);
2001
2002 /* Assign incremented cnt for every field of DN to check DN field in
2003 * right order */
2004 config_dn_field_index = get_dn_field_index(dn_cnt, nid);
2005 if (config_dn_field_index < 0)
2006 return 0;
2007
2008 /* Fetch value based on NID */
2009 for (i = -1; (i = X509_NAME_get_index_by_NID(name, nid, i)) > -1;) {
2010 X509_NAME_ENTRY *e;
2011 ASN1_STRING *cn;
2012
2013 e = X509_NAME_get_entry(name, i);
2014 if (!e)
2015 continue;
2016
2017 cn = X509_NAME_ENTRY_get_data(e);
2018 if (!cn)
2019 continue;
2020
2021 match_index++;
2022
2023 /* check for more than one DN field with same name */
2024 if (match_index != config_dn_field_index)
2025 continue;
2026
2027 /* Check wildcard at the right end side */
2028 /* E.g., if OU=develop* mentioned in configuration, allow 'OU'
2029 * of the subject in the client certificate to start with
2030 * 'develop' */
2031 if (len > 0 && value[len - 1] == '*') {
2032 /* Compare actual certificate DN field value with
2033 * configuration DN field value up to the specified
2034 * length. */
2035 ret = ASN1_STRING_length(cn) >= len - 1 &&
2036 os_memcmp(ASN1_STRING_get0_data(cn), value,
2037 len - 1) == 0;
2038 } else {
2039 /* Compare actual certificate DN field value with
2040 * configuration DN field value */
2041 ret = ASN1_STRING_length(cn) == len &&
2042 os_memcmp(ASN1_STRING_get0_data(cn), value,
2043 len) == 0;
2044 }
2045 if (!ret) {
2046 wpa_printf(MSG_ERROR,
2047 "OpenSSL: Failed to match %s '%s' with certificate DN field value '%s'",
2048 field, value, ASN1_STRING_get0_data(cn));
2049 }
2050 break;
2051 }
2052
2053 return ret;
2054 }
2055
2056
2057 /**
2058 * get_value_from_field - Get value from DN field
2059 * @cert: Certificate
2060 * @field_str: DN field string which is passed from configuration file (e.g.,
2061 * C=US)
2062 * @dn_cnt: DN matching context
2063 * Returns: 1 on success and 0 on failure
2064 */
get_value_from_field(const X509 * cert,char * field_str,struct tls_dn_field_order_cnt * dn_cnt)2065 static int get_value_from_field(const X509 *cert, char *field_str,
2066 struct tls_dn_field_order_cnt *dn_cnt)
2067 {
2068 int nid;
2069 char *context = NULL, *name, *value;
2070
2071 if (os_strcmp(field_str, "*") == 0)
2072 return 1; /* wildcard matches everything */
2073
2074 name = str_token(field_str, "=", &context);
2075 if (!name)
2076 return 0;
2077
2078 /* Compare all configured DN fields and assign nid based on that to
2079 * fetch correct value from certificate subject */
2080 if (os_strcmp(name, "CN") == 0) {
2081 nid = NID_commonName;
2082 dn_cnt->cn++;
2083 } else if(os_strcmp(name, "C") == 0) {
2084 nid = NID_countryName;
2085 dn_cnt->c++;
2086 } else if (os_strcmp(name, "L") == 0) {
2087 nid = NID_localityName;
2088 dn_cnt->l++;
2089 } else if (os_strcmp(name, "ST") == 0) {
2090 nid = NID_stateOrProvinceName;
2091 dn_cnt->st++;
2092 } else if (os_strcmp(name, "O") == 0) {
2093 nid = NID_organizationName;
2094 dn_cnt->o++;
2095 } else if (os_strcmp(name, "OU") == 0) {
2096 nid = NID_organizationalUnitName;
2097 dn_cnt->ou++;
2098 } else if (os_strcmp(name, "emailAddress") == 0) {
2099 nid = NID_pkcs9_emailAddress;
2100 dn_cnt->email++;
2101 } else {
2102 wpa_printf(MSG_ERROR,
2103 "TLS: Unknown field '%s' in check_cert_subject", name);
2104 return 0;
2105 }
2106
2107 value = str_token(field_str, "=", &context);
2108 if (!value) {
2109 wpa_printf(MSG_ERROR,
2110 "TLS: Distinguished Name field '%s' value is not defined in check_cert_subject",
2111 name);
2112 return 0;
2113 }
2114
2115 return match_dn_field(cert, nid, name, value, dn_cnt);
2116 }
2117
2118
2119 /**
2120 * tls_match_dn_field - Match subject DN field with check_cert_subject
2121 * @cert: Certificate
2122 * @match: check_cert_subject string
2123 * Returns: Return 1 on success and 0 on failure
2124 */
tls_match_dn_field(X509 * cert,const char * match)2125 static int tls_match_dn_field(X509 *cert, const char *match)
2126 {
2127 const char *token, *last = NULL;
2128 char field[256];
2129 struct tls_dn_field_order_cnt dn_cnt;
2130
2131 os_memset(&dn_cnt, 0, sizeof(dn_cnt));
2132
2133 /* Maximum length of each DN field is 255 characters */
2134
2135 /* Process each '/' delimited field */
2136 while ((token = cstr_token(match, "/", &last))) {
2137 if (last - token >= (int) sizeof(field)) {
2138 wpa_printf(MSG_ERROR,
2139 "OpenSSL: Too long DN matching field value in '%s'",
2140 match);
2141 return 0;
2142 }
2143 os_memcpy(field, token, last - token);
2144 field[last - token] = '\0';
2145
2146 if (!get_value_from_field(cert, field, &dn_cnt)) {
2147 wpa_printf(MSG_DEBUG, "OpenSSL: No match for DN '%s'",
2148 field);
2149 return 0;
2150 }
2151 }
2152
2153 return 1;
2154 }
2155
2156
2157 #ifndef CONFIG_NATIVE_WINDOWS
tls_match_suffix_helper(X509 * cert,const char * match,size_t match_len,int full)2158 static int tls_match_suffix_helper(X509 *cert, const char *match,
2159 size_t match_len, int full)
2160 {
2161 GENERAL_NAME *gen;
2162 void *ext;
2163 int i;
2164 stack_index_t j;
2165 int dns_name = 0;
2166 X509_NAME *name;
2167
2168 wpa_printf(MSG_DEBUG, "TLS: Match domain against %s%s",
2169 full ? "": "suffix ", match);
2170
2171 ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
2172
2173 for (j = 0; ext && j < sk_GENERAL_NAME_num(ext); j++) {
2174 gen = sk_GENERAL_NAME_value(ext, j);
2175 if (gen->type != GEN_DNS)
2176 continue;
2177 dns_name++;
2178 wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate dNSName",
2179 gen->d.dNSName->data,
2180 gen->d.dNSName->length);
2181 if (domain_suffix_match(gen->d.dNSName->data,
2182 gen->d.dNSName->length,
2183 match, match_len, full) == 1) {
2184 wpa_printf(MSG_DEBUG, "TLS: %s in dNSName found",
2185 full ? "Match" : "Suffix match");
2186 sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
2187 return 1;
2188 }
2189 }
2190 sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
2191
2192 if (dns_name) {
2193 wpa_printf(MSG_DEBUG, "TLS: None of the dNSName(s) matched");
2194 return 0;
2195 }
2196
2197 name = X509_get_subject_name(cert);
2198 i = -1;
2199 for (;;) {
2200 X509_NAME_ENTRY *e;
2201 ASN1_STRING *cn;
2202
2203 i = X509_NAME_get_index_by_NID(name, NID_commonName, i);
2204 if (i == -1)
2205 break;
2206 e = X509_NAME_get_entry(name, i);
2207 if (e == NULL)
2208 continue;
2209 cn = X509_NAME_ENTRY_get_data(e);
2210 if (cn == NULL)
2211 continue;
2212 wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate commonName",
2213 cn->data, cn->length);
2214 if (domain_suffix_match(cn->data, cn->length,
2215 match, match_len, full) == 1) {
2216 wpa_printf(MSG_DEBUG, "TLS: %s in commonName found",
2217 full ? "Match" : "Suffix match");
2218 return 1;
2219 }
2220 }
2221
2222 wpa_printf(MSG_DEBUG, "TLS: No CommonName %smatch found",
2223 full ? "": "suffix ");
2224 return 0;
2225 }
2226 #endif /* CONFIG_NATIVE_WINDOWS */
2227
2228
tls_match_suffix(X509 * cert,const char * match,int full)2229 static int tls_match_suffix(X509 *cert, const char *match, int full)
2230 {
2231 #ifdef CONFIG_NATIVE_WINDOWS
2232 /* wincrypt.h has conflicting X509_NAME definition */
2233 return -1;
2234 #else /* CONFIG_NATIVE_WINDOWS */
2235 const char *token, *last = NULL;
2236
2237 /* Process each match alternative separately until a match is found */
2238 while ((token = cstr_token(match, ";", &last))) {
2239 if (tls_match_suffix_helper(cert, token, last - token, full))
2240 return 1;
2241 }
2242
2243 return 0;
2244 #endif /* CONFIG_NATIVE_WINDOWS */
2245 }
2246
2247
openssl_tls_fail_reason(int err)2248 static enum tls_fail_reason openssl_tls_fail_reason(int err)
2249 {
2250 switch (err) {
2251 case X509_V_ERR_CERT_REVOKED:
2252 return TLS_FAIL_REVOKED;
2253 case X509_V_ERR_CERT_NOT_YET_VALID:
2254 case X509_V_ERR_CRL_NOT_YET_VALID:
2255 return TLS_FAIL_NOT_YET_VALID;
2256 case X509_V_ERR_CERT_HAS_EXPIRED:
2257 case X509_V_ERR_CRL_HAS_EXPIRED:
2258 return TLS_FAIL_EXPIRED;
2259 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
2260 case X509_V_ERR_UNABLE_TO_GET_CRL:
2261 case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
2262 case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
2263 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
2264 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
2265 case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
2266 case X509_V_ERR_CERT_CHAIN_TOO_LONG:
2267 case X509_V_ERR_PATH_LENGTH_EXCEEDED:
2268 case X509_V_ERR_INVALID_CA:
2269 return TLS_FAIL_UNTRUSTED;
2270 case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
2271 case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
2272 case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
2273 case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
2274 case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
2275 case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
2276 case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
2277 case X509_V_ERR_CERT_UNTRUSTED:
2278 case X509_V_ERR_CERT_REJECTED:
2279 return TLS_FAIL_BAD_CERTIFICATE;
2280 default:
2281 return TLS_FAIL_UNSPECIFIED;
2282 }
2283 }
2284
2285
get_x509_cert(X509 * cert)2286 static struct wpabuf * get_x509_cert(X509 *cert)
2287 {
2288 struct wpabuf *buf;
2289 u8 *tmp;
2290
2291 int cert_len = i2d_X509(cert, NULL);
2292 if (cert_len <= 0)
2293 return NULL;
2294
2295 buf = wpabuf_alloc(cert_len);
2296 if (buf == NULL)
2297 return NULL;
2298
2299 tmp = wpabuf_put(buf, cert_len);
2300 i2d_X509(cert, &tmp);
2301 return buf;
2302 }
2303
2304
openssl_tls_fail_event(struct tls_connection * conn,X509 * err_cert,int err,int depth,const char * subject,const char * err_str,enum tls_fail_reason reason)2305 static void openssl_tls_fail_event(struct tls_connection *conn,
2306 X509 *err_cert, int err, int depth,
2307 const char *subject, const char *err_str,
2308 enum tls_fail_reason reason)
2309 {
2310 union tls_event_data ev;
2311 struct wpabuf *cert = NULL;
2312 struct tls_context *context = conn->context;
2313
2314 if (context->event_cb == NULL)
2315 return;
2316
2317 cert = get_x509_cert(err_cert);
2318 os_memset(&ev, 0, sizeof(ev));
2319 ev.cert_fail.reason = reason != TLS_FAIL_UNSPECIFIED ?
2320 reason : openssl_tls_fail_reason(err);
2321 ev.cert_fail.depth = depth;
2322 ev.cert_fail.subject = subject;
2323 ev.cert_fail.reason_txt = err_str;
2324 ev.cert_fail.cert = cert;
2325 context->event_cb(context->cb_ctx, TLS_CERT_CHAIN_FAILURE, &ev);
2326 wpabuf_free(cert);
2327 }
2328
2329
openssl_cert_tod(X509 * cert)2330 static int openssl_cert_tod(X509 *cert)
2331 {
2332 CERTIFICATEPOLICIES *ext;
2333 stack_index_t i;
2334 char buf[100];
2335 int res;
2336 int tod = 0;
2337
2338 ext = X509_get_ext_d2i(cert, NID_certificate_policies, NULL, NULL);
2339 if (!ext)
2340 return 0;
2341
2342 for (i = 0; i < sk_POLICYINFO_num(ext); i++) {
2343 POLICYINFO *policy;
2344
2345 policy = sk_POLICYINFO_value(ext, i);
2346 res = OBJ_obj2txt(buf, sizeof(buf), policy->policyid, 0);
2347 if (res < 0 || (size_t) res >= sizeof(buf))
2348 continue;
2349 wpa_printf(MSG_DEBUG, "OpenSSL: Certificate Policy %s", buf);
2350 if (os_strcmp(buf, "1.3.6.1.4.1.40808.1.3.1") == 0)
2351 tod = 1; /* TOD-STRICT */
2352 else if (os_strcmp(buf, "1.3.6.1.4.1.40808.1.3.2") == 0 && !tod)
2353 tod = 2; /* TOD-TOFU */
2354 }
2355 sk_POLICYINFO_pop_free(ext, POLICYINFO_free);
2356
2357 return tod;
2358 }
2359
2360
openssl_tls_cert_event(struct tls_connection * conn,X509 * err_cert,int depth,const char * subject)2361 static void openssl_tls_cert_event(struct tls_connection *conn,
2362 X509 *err_cert, int depth,
2363 const char *subject)
2364 {
2365 struct wpabuf *cert = NULL;
2366 union tls_event_data ev;
2367 struct tls_context *context = conn->context;
2368 char *altsubject[TLS_MAX_ALT_SUBJECT];
2369 int alt, num_altsubject = 0;
2370 GENERAL_NAME *gen;
2371 void *ext;
2372 stack_index_t i;
2373 ASN1_INTEGER *ser;
2374 char serial_num[128];
2375 #ifdef CONFIG_SHA256
2376 u8 hash[32];
2377 #endif /* CONFIG_SHA256 */
2378
2379 if (context->event_cb == NULL)
2380 return;
2381
2382 os_memset(&ev, 0, sizeof(ev));
2383 if (conn->cert_probe || (conn->flags & TLS_CONN_EXT_CERT_CHECK) ||
2384 context->cert_in_cb) {
2385 cert = get_x509_cert(err_cert);
2386 ev.peer_cert.cert = cert;
2387 }
2388 #ifdef CONFIG_SHA256
2389 if (cert) {
2390 const u8 *addr[1];
2391 size_t len[1];
2392 addr[0] = wpabuf_head(cert);
2393 len[0] = wpabuf_len(cert);
2394 if (sha256_vector(1, addr, len, hash) == 0) {
2395 ev.peer_cert.hash = hash;
2396 ev.peer_cert.hash_len = sizeof(hash);
2397 }
2398 }
2399 #endif /* CONFIG_SHA256 */
2400 ev.peer_cert.depth = depth;
2401 ev.peer_cert.subject = subject;
2402
2403 ser = X509_get_serialNumber(err_cert);
2404 if (ser) {
2405 wpa_snprintf_hex_uppercase(serial_num, sizeof(serial_num),
2406 ASN1_STRING_get0_data(ser),
2407 ASN1_STRING_length(ser));
2408 ev.peer_cert.serial_num = serial_num;
2409 }
2410
2411 ext = X509_get_ext_d2i(err_cert, NID_subject_alt_name, NULL, NULL);
2412 for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
2413 char *pos;
2414
2415 if (num_altsubject == TLS_MAX_ALT_SUBJECT)
2416 break;
2417 gen = sk_GENERAL_NAME_value(ext, i);
2418 if (gen->type != GEN_EMAIL &&
2419 gen->type != GEN_DNS &&
2420 gen->type != GEN_URI)
2421 continue;
2422
2423 pos = os_malloc(10 + gen->d.ia5->length + 1);
2424 if (pos == NULL)
2425 break;
2426 altsubject[num_altsubject++] = pos;
2427
2428 switch (gen->type) {
2429 case GEN_EMAIL:
2430 os_memcpy(pos, "EMAIL:", 6);
2431 pos += 6;
2432 break;
2433 case GEN_DNS:
2434 os_memcpy(pos, "DNS:", 4);
2435 pos += 4;
2436 break;
2437 case GEN_URI:
2438 os_memcpy(pos, "URI:", 4);
2439 pos += 4;
2440 break;
2441 }
2442
2443 os_memcpy(pos, gen->d.ia5->data, gen->d.ia5->length);
2444 pos += gen->d.ia5->length;
2445 *pos = '\0';
2446 }
2447 sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
2448
2449 for (alt = 0; alt < num_altsubject; alt++)
2450 ev.peer_cert.altsubject[alt] = altsubject[alt];
2451 ev.peer_cert.num_altsubject = num_altsubject;
2452
2453 ev.peer_cert.tod = openssl_cert_tod(err_cert);
2454
2455 context->event_cb(context->cb_ctx, TLS_PEER_CERTIFICATE, &ev);
2456 wpabuf_free(cert);
2457 for (alt = 0; alt < num_altsubject; alt++)
2458 os_free(altsubject[alt]);
2459 }
2460
2461
debug_print_cert(X509 * cert,const char * title)2462 static void debug_print_cert(X509 *cert, const char *title)
2463 {
2464 #ifndef CONFIG_NO_STDOUT_DEBUG
2465 BIO *out;
2466 size_t rlen;
2467 char *txt;
2468 int res;
2469
2470 if (wpa_debug_level > MSG_DEBUG)
2471 return;
2472
2473 out = BIO_new(BIO_s_mem());
2474 if (!out)
2475 return;
2476
2477 X509_print(out, cert);
2478 rlen = BIO_ctrl_pending(out);
2479 txt = os_malloc(rlen + 1);
2480 if (txt) {
2481 res = BIO_read(out, txt, rlen);
2482 if (res > 0) {
2483 txt[res] = '\0';
2484 wpa_printf(MSG_DEBUG, "OpenSSL: %s\n%s", title, txt);
2485 }
2486 os_free(txt);
2487 }
2488
2489 BIO_free(out);
2490 #endif /* CONFIG_NO_STDOUT_DEBUG */
2491 }
2492
2493
tls_verify_cb(int preverify_ok,X509_STORE_CTX * x509_ctx)2494 static int tls_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
2495 {
2496 char buf[256];
2497 X509 *err_cert;
2498 int err, depth;
2499 SSL *ssl;
2500 struct tls_connection *conn;
2501 struct tls_context *context;
2502 char *match, *altmatch, *suffix_match, *domain_match;
2503 const char *check_cert_subject;
2504 const char *err_str;
2505
2506 err_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
2507 if (!err_cert)
2508 return 0;
2509
2510 err = X509_STORE_CTX_get_error(x509_ctx);
2511 depth = X509_STORE_CTX_get_error_depth(x509_ctx);
2512 ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
2513 SSL_get_ex_data_X509_STORE_CTX_idx());
2514 os_snprintf(buf, sizeof(buf), "Peer certificate - depth %d", depth);
2515 debug_print_cert(err_cert, buf);
2516 X509_NAME_oneline(X509_get_subject_name(err_cert), buf, sizeof(buf));
2517
2518 conn = SSL_get_app_data(ssl);
2519 if (conn == NULL)
2520 return 0;
2521
2522 if (depth == 0)
2523 conn->peer_cert = err_cert;
2524 else if (depth == 1)
2525 conn->peer_issuer = err_cert;
2526 else if (depth == 2)
2527 conn->peer_issuer_issuer = err_cert;
2528
2529 context = conn->context;
2530 match = conn->subject_match;
2531 altmatch = conn->altsubject_match;
2532 suffix_match = conn->suffix_match;
2533 domain_match = conn->domain_match;
2534
2535 if (!preverify_ok && !conn->ca_cert_verify)
2536 preverify_ok = 1;
2537 if (!preverify_ok && depth > 0 && conn->server_cert_only)
2538 preverify_ok = 1;
2539 if (!preverify_ok && (conn->flags & TLS_CONN_DISABLE_TIME_CHECKS) &&
2540 (err == X509_V_ERR_CERT_HAS_EXPIRED ||
2541 err == X509_V_ERR_CERT_NOT_YET_VALID)) {
2542 wpa_printf(MSG_DEBUG, "OpenSSL: Ignore certificate validity "
2543 "time mismatch");
2544 preverify_ok = 1;
2545 }
2546 if (!preverify_ok && !conn->data->check_crl_strict &&
2547 (err == X509_V_ERR_CRL_HAS_EXPIRED ||
2548 err == X509_V_ERR_CRL_NOT_YET_VALID)) {
2549 wpa_printf(MSG_DEBUG,
2550 "OpenSSL: Ignore certificate validity CRL time mismatch");
2551 preverify_ok = 1;
2552 }
2553
2554 err_str = X509_verify_cert_error_string(err);
2555
2556 #ifdef CONFIG_SHA256
2557 /*
2558 * Do not require preverify_ok so we can explicity allow otherwise
2559 * invalid pinned server certificates.
2560 */
2561 if (depth == 0 && conn->server_cert_only) {
2562 struct wpabuf *cert;
2563 cert = get_x509_cert(err_cert);
2564 if (!cert) {
2565 wpa_printf(MSG_DEBUG, "OpenSSL: Could not fetch "
2566 "server certificate data");
2567 preverify_ok = 0;
2568 } else {
2569 u8 hash[32];
2570 const u8 *addr[1];
2571 size_t len[1];
2572 addr[0] = wpabuf_head(cert);
2573 len[0] = wpabuf_len(cert);
2574 if (sha256_vector(1, addr, len, hash) < 0 ||
2575 os_memcmp(conn->srv_cert_hash, hash, 32) != 0) {
2576 err_str = "Server certificate mismatch";
2577 err = X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
2578 preverify_ok = 0;
2579 } else if (!preverify_ok) {
2580 /*
2581 * Certificate matches pinned certificate, allow
2582 * regardless of other problems.
2583 */
2584 wpa_printf(MSG_DEBUG,
2585 "OpenSSL: Ignore validation issues for a pinned server certificate");
2586 preverify_ok = 1;
2587 }
2588 wpabuf_free(cert);
2589 }
2590 }
2591 #endif /* CONFIG_SHA256 */
2592
2593 openssl_tls_cert_event(conn, err_cert, depth, buf);
2594
2595 if (!preverify_ok) {
2596 if (depth > 0) {
2597 /* Send cert event for the peer certificate so that
2598 * the upper layers get information about it even if
2599 * validation of a CA certificate fails. */
2600 STACK_OF(X509) *chain;
2601
2602 chain = X509_STORE_CTX_get1_chain(x509_ctx);
2603 if (chain && sk_X509_num(chain) > 0) {
2604 char buf2[256];
2605 X509 *cert;
2606
2607 cert = sk_X509_value(chain, 0);
2608 X509_NAME_oneline(X509_get_subject_name(cert),
2609 buf2, sizeof(buf2));
2610
2611 openssl_tls_cert_event(conn, cert, 0, buf2);
2612 }
2613 if (chain)
2614 sk_X509_pop_free(chain, X509_free);
2615 }
2616
2617 wpa_printf(MSG_WARNING, "TLS: Certificate verification failed,"
2618 " error %d (%s) depth %d for '%s'", err, err_str,
2619 depth, buf);
2620 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2621 err_str, TLS_FAIL_UNSPECIFIED);
2622 return preverify_ok;
2623 }
2624
2625 wpa_printf(MSG_DEBUG, "TLS: tls_verify_cb - preverify_ok=%d "
2626 "err=%d (%s) ca_cert_verify=%d depth=%d buf='%s'",
2627 preverify_ok, err, err_str,
2628 conn->ca_cert_verify, depth, buf);
2629 check_cert_subject = conn->check_cert_subject;
2630 if (!check_cert_subject)
2631 check_cert_subject = conn->data->check_cert_subject;
2632 if (check_cert_subject) {
2633 if (depth == 0 &&
2634 !tls_match_dn_field(err_cert, check_cert_subject)) {
2635 preverify_ok = 0;
2636 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2637 "Distinguished Name",
2638 TLS_FAIL_DN_MISMATCH);
2639 }
2640 }
2641 if (depth == 0 && match && os_strstr(buf, match) == NULL) {
2642 wpa_printf(MSG_WARNING, "TLS: Subject '%s' did not "
2643 "match with '%s'", buf, match);
2644 preverify_ok = 0;
2645 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2646 "Subject mismatch",
2647 TLS_FAIL_SUBJECT_MISMATCH);
2648 } else if (depth == 0 && altmatch &&
2649 !tls_match_altsubject(err_cert, altmatch)) {
2650 wpa_printf(MSG_WARNING, "TLS: altSubjectName match "
2651 "'%s' not found", altmatch);
2652 preverify_ok = 0;
2653 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2654 "AltSubject mismatch",
2655 TLS_FAIL_ALTSUBJECT_MISMATCH);
2656 } else if (depth == 0 && suffix_match &&
2657 !tls_match_suffix(err_cert, suffix_match, 0)) {
2658 wpa_printf(MSG_WARNING, "TLS: Domain suffix match '%s' not found",
2659 suffix_match);
2660 preverify_ok = 0;
2661 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2662 "Domain suffix mismatch",
2663 TLS_FAIL_DOMAIN_SUFFIX_MISMATCH);
2664 } else if (depth == 0 && domain_match &&
2665 !tls_match_suffix(err_cert, domain_match, 1)) {
2666 wpa_printf(MSG_WARNING, "TLS: Domain match '%s' not found",
2667 domain_match);
2668 preverify_ok = 0;
2669 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2670 "Domain mismatch",
2671 TLS_FAIL_DOMAIN_MISMATCH);
2672 }
2673
2674 if (conn->cert_probe && preverify_ok && depth == 0) {
2675 wpa_printf(MSG_DEBUG, "OpenSSL: Reject server certificate "
2676 "on probe-only run");
2677 preverify_ok = 0;
2678 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2679 "Server certificate chain probe",
2680 TLS_FAIL_SERVER_CHAIN_PROBE);
2681 }
2682
2683 #ifdef CONFIG_SUITEB
2684 if (conn->flags & TLS_CONN_SUITEB) {
2685 EVP_PKEY *pk;
2686 int len = -1;
2687
2688 pk = X509_get_pubkey(err_cert);
2689 if (pk) {
2690 len = EVP_PKEY_bits(pk);
2691 EVP_PKEY_free(pk);
2692 }
2693
2694 if (len >= 0) {
2695 wpa_printf(MSG_DEBUG,
2696 "OpenSSL: RSA modulus size: %d bits", len);
2697 if (len < 3072) {
2698 preverify_ok = 0;
2699 openssl_tls_fail_event(
2700 conn, err_cert, err,
2701 depth, buf,
2702 "Insufficient RSA modulus size",
2703 TLS_FAIL_INSUFFICIENT_KEY_LEN);
2704 }
2705 }
2706 }
2707 #endif /* CONFIG_SUITEB */
2708
2709 #ifdef OPENSSL_IS_BORINGSSL
2710 if (depth == 0 && (conn->flags & TLS_CONN_REQUEST_OCSP) &&
2711 preverify_ok) {
2712 enum ocsp_result res;
2713
2714 res = check_ocsp_resp(conn->ssl_ctx, conn->ssl, err_cert,
2715 conn->peer_issuer,
2716 conn->peer_issuer_issuer);
2717 if (res == OCSP_REVOKED) {
2718 preverify_ok = 0;
2719 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2720 "certificate revoked",
2721 TLS_FAIL_REVOKED);
2722 if (err == X509_V_OK)
2723 X509_STORE_CTX_set_error(
2724 x509_ctx, X509_V_ERR_CERT_REVOKED);
2725 } else if (res != OCSP_GOOD &&
2726 (conn->flags & TLS_CONN_REQUIRE_OCSP)) {
2727 preverify_ok = 0;
2728 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2729 "bad certificate status response",
2730 TLS_FAIL_UNSPECIFIED);
2731 }
2732 }
2733 #endif /* OPENSSL_IS_BORINGSSL */
2734
2735 if (depth == 0 && preverify_ok && context->event_cb != NULL)
2736 context->event_cb(context->cb_ctx,
2737 TLS_CERT_CHAIN_SUCCESS, NULL);
2738
2739 if (depth == 0 && preverify_ok) {
2740 os_free(conn->peer_subject);
2741 conn->peer_subject = os_strdup(buf);
2742 }
2743
2744 return preverify_ok;
2745 }
2746
2747
2748 #ifndef OPENSSL_NO_STDIO
tls_load_ca_der(struct tls_data * data,const char * ca_cert)2749 static int tls_load_ca_der(struct tls_data *data, const char *ca_cert)
2750 {
2751 SSL_CTX *ssl_ctx = data->ssl;
2752 X509_LOOKUP *lookup;
2753 int ret = 0;
2754
2755 lookup = X509_STORE_add_lookup(SSL_CTX_get_cert_store(ssl_ctx),
2756 X509_LOOKUP_file());
2757 if (lookup == NULL) {
2758 tls_show_errors(MSG_WARNING, __func__,
2759 "Failed add lookup for X509 store");
2760 return -1;
2761 }
2762
2763 if (!X509_LOOKUP_load_file(lookup, ca_cert, X509_FILETYPE_ASN1)) {
2764 unsigned long err = ERR_peek_error();
2765 tls_show_errors(MSG_WARNING, __func__,
2766 "Failed load CA in DER format");
2767 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
2768 ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
2769 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
2770 "cert already in hash table error",
2771 __func__);
2772 } else
2773 ret = -1;
2774 }
2775
2776 return ret;
2777 }
2778 #endif /* OPENSSL_NO_STDIO */
2779
2780
tls_connection_ca_cert(struct tls_data * data,struct tls_connection * conn,const char * ca_cert,const u8 * ca_cert_blob,size_t ca_cert_blob_len,const char * ca_path)2781 static int tls_connection_ca_cert(struct tls_data *data,
2782 struct tls_connection *conn,
2783 const char *ca_cert, const u8 *ca_cert_blob,
2784 size_t ca_cert_blob_len, const char *ca_path)
2785 {
2786 SSL_CTX *ssl_ctx = data->ssl;
2787 X509_STORE *store;
2788
2789 /*
2790 * Remove previously configured trusted CA certificates before adding
2791 * new ones.
2792 */
2793 store = X509_STORE_new();
2794 if (store == NULL) {
2795 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
2796 "certificate store", __func__);
2797 return -1;
2798 }
2799 SSL_CTX_set_cert_store(ssl_ctx, store);
2800
2801 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
2802 conn->ca_cert_verify = 1;
2803
2804 if (ca_cert && os_strncmp(ca_cert, "probe://", 8) == 0) {
2805 wpa_printf(MSG_DEBUG, "OpenSSL: Probe for server certificate "
2806 "chain");
2807 conn->cert_probe = 1;
2808 conn->ca_cert_verify = 0;
2809 return 0;
2810 }
2811
2812 if (ca_cert && os_strncmp(ca_cert, "hash://", 7) == 0) {
2813 #ifdef CONFIG_SHA256
2814 const char *pos = ca_cert + 7;
2815 if (os_strncmp(pos, "server/sha256/", 14) != 0) {
2816 wpa_printf(MSG_DEBUG, "OpenSSL: Unsupported ca_cert "
2817 "hash value '%s'", ca_cert);
2818 return -1;
2819 }
2820 pos += 14;
2821 if (os_strlen(pos) != 32 * 2) {
2822 wpa_printf(MSG_DEBUG, "OpenSSL: Unexpected SHA256 "
2823 "hash length in ca_cert '%s'", ca_cert);
2824 return -1;
2825 }
2826 if (hexstr2bin(pos, conn->srv_cert_hash, 32) < 0) {
2827 wpa_printf(MSG_DEBUG, "OpenSSL: Invalid SHA256 hash "
2828 "value in ca_cert '%s'", ca_cert);
2829 return -1;
2830 }
2831 conn->server_cert_only = 1;
2832 wpa_printf(MSG_DEBUG, "OpenSSL: Checking only server "
2833 "certificate match");
2834 return 0;
2835 #else /* CONFIG_SHA256 */
2836 wpa_printf(MSG_INFO, "No SHA256 included in the build - "
2837 "cannot validate server certificate hash");
2838 return -1;
2839 #endif /* CONFIG_SHA256 */
2840 }
2841
2842 if (ca_cert_blob) {
2843 X509 *cert = d2i_X509(NULL,
2844 (const unsigned char **) &ca_cert_blob,
2845 ca_cert_blob_len);
2846 if (cert == NULL) {
2847 BIO *bio = BIO_new_mem_buf(ca_cert_blob,
2848 ca_cert_blob_len);
2849
2850 if (bio) {
2851 cert = PEM_read_bio_X509(bio, NULL, NULL, NULL);
2852 BIO_free(bio);
2853 }
2854
2855 if (!cert) {
2856 tls_show_errors(MSG_WARNING, __func__,
2857 "Failed to parse ca_cert_blob");
2858 return -1;
2859 }
2860
2861 while (ERR_get_error()) {
2862 /* Ignore errors from DER conversion. */
2863 }
2864 }
2865
2866 if (!X509_STORE_add_cert(SSL_CTX_get_cert_store(ssl_ctx),
2867 cert)) {
2868 unsigned long err = ERR_peek_error();
2869 tls_show_errors(MSG_WARNING, __func__,
2870 "Failed to add ca_cert_blob to "
2871 "certificate store");
2872 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
2873 ERR_GET_REASON(err) ==
2874 X509_R_CERT_ALREADY_IN_HASH_TABLE) {
2875 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
2876 "cert already in hash table error",
2877 __func__);
2878 } else {
2879 X509_free(cert);
2880 return -1;
2881 }
2882 }
2883 X509_free(cert);
2884 wpa_printf(MSG_DEBUG, "OpenSSL: %s - added ca_cert_blob "
2885 "to certificate store", __func__);
2886 return 0;
2887 }
2888
2889 #ifdef ANDROID
2890 /* Single alias */
2891 if (ca_cert && os_strncmp("keystore://", ca_cert, 11) == 0) {
2892 if (tls_add_ca_from_keystore(SSL_CTX_get_cert_store(ssl_ctx),
2893 &ca_cert[11]) < 0)
2894 return -1;
2895 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
2896 return 0;
2897 }
2898
2899 /* Multiple aliases separated by space */
2900 if (ca_cert && os_strncmp("keystores://", ca_cert, 12) == 0) {
2901 char *aliases = os_strdup(&ca_cert[12]);
2902 const char *delim = " ";
2903 int rc = 0;
2904 char *savedptr;
2905 char *alias;
2906
2907 if (!aliases)
2908 return -1;
2909 alias = strtok_r(aliases, delim, &savedptr);
2910 for (; alias; alias = strtok_r(NULL, delim, &savedptr)) {
2911 if (tls_add_ca_from_keystore_encoded(
2912 SSL_CTX_get_cert_store(ssl_ctx), alias)) {
2913 wpa_printf(MSG_WARNING,
2914 "OpenSSL: %s - Failed to add ca_cert %s from keystore",
2915 __func__, alias);
2916 rc = -1;
2917 break;
2918 }
2919 }
2920 os_free(aliases);
2921 if (rc)
2922 return rc;
2923
2924 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
2925 return 0;
2926 }
2927 #endif /* ANDROID */
2928
2929 #ifdef CONFIG_NATIVE_WINDOWS
2930 if (ca_cert && tls_cryptoapi_ca_cert(ssl_ctx, conn->ssl, ca_cert) ==
2931 0) {
2932 wpa_printf(MSG_DEBUG, "OpenSSL: Added CA certificates from "
2933 "system certificate store");
2934 return 0;
2935 }
2936 #endif /* CONFIG_NATIVE_WINDOWS */
2937
2938 if (ca_cert || ca_path) {
2939 #ifndef OPENSSL_NO_STDIO
2940 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, ca_path) !=
2941 1) {
2942 tls_show_errors(MSG_WARNING, __func__,
2943 "Failed to load root certificates");
2944 if (ca_cert &&
2945 tls_load_ca_der(data, ca_cert) == 0) {
2946 wpa_printf(MSG_DEBUG, "OpenSSL: %s - loaded "
2947 "DER format CA certificate",
2948 __func__);
2949 } else
2950 return -1;
2951 } else {
2952 wpa_printf(MSG_DEBUG, "TLS: Trusted root "
2953 "certificate(s) loaded");
2954 tls_get_errors(data);
2955 }
2956 #else /* OPENSSL_NO_STDIO */
2957 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
2958 __func__);
2959 return -1;
2960 #endif /* OPENSSL_NO_STDIO */
2961 } else {
2962 /* No ca_cert configured - do not try to verify server
2963 * certificate */
2964 conn->ca_cert_verify = 0;
2965 }
2966
2967 return 0;
2968 }
2969
2970
tls_global_ca_cert(struct tls_data * data,const char * ca_cert)2971 static int tls_global_ca_cert(struct tls_data *data, const char *ca_cert)
2972 {
2973 SSL_CTX *ssl_ctx = data->ssl;
2974
2975 if (ca_cert) {
2976 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, NULL) != 1)
2977 {
2978 tls_show_errors(MSG_WARNING, __func__,
2979 "Failed to load root certificates");
2980 return -1;
2981 }
2982
2983 wpa_printf(MSG_DEBUG, "TLS: Trusted root "
2984 "certificate(s) loaded");
2985
2986 #ifndef OPENSSL_NO_STDIO
2987 /* Add the same CAs to the client certificate requests */
2988 SSL_CTX_set_client_CA_list(ssl_ctx,
2989 SSL_load_client_CA_file(ca_cert));
2990 #endif /* OPENSSL_NO_STDIO */
2991
2992 os_free(data->ca_cert);
2993 data->ca_cert = os_strdup(ca_cert);
2994 }
2995
2996 return 0;
2997 }
2998
2999
tls_global_set_verify(void * ssl_ctx,int check_crl,int strict)3000 int tls_global_set_verify(void *ssl_ctx, int check_crl, int strict)
3001 {
3002 int flags;
3003
3004 if (check_crl) {
3005 struct tls_data *data = ssl_ctx;
3006 X509_STORE *cs = SSL_CTX_get_cert_store(data->ssl);
3007 if (cs == NULL) {
3008 tls_show_errors(MSG_INFO, __func__, "Failed to get "
3009 "certificate store when enabling "
3010 "check_crl");
3011 return -1;
3012 }
3013 flags = X509_V_FLAG_CRL_CHECK;
3014 if (check_crl == 2)
3015 flags |= X509_V_FLAG_CRL_CHECK_ALL;
3016 X509_STORE_set_flags(cs, flags);
3017
3018 data->check_crl = check_crl;
3019 data->check_crl_strict = strict;
3020 os_get_reltime(&data->crl_last_reload);
3021 }
3022 return 0;
3023 }
3024
3025
tls_connection_set_subject_match(struct tls_connection * conn,const char * subject_match,const char * altsubject_match,const char * suffix_match,const char * domain_match,const char * check_cert_subject)3026 static int tls_connection_set_subject_match(struct tls_connection *conn,
3027 const char *subject_match,
3028 const char *altsubject_match,
3029 const char *suffix_match,
3030 const char *domain_match,
3031 const char *check_cert_subject)
3032 {
3033 os_free(conn->subject_match);
3034 conn->subject_match = NULL;
3035 if (subject_match) {
3036 conn->subject_match = os_strdup(subject_match);
3037 if (conn->subject_match == NULL)
3038 return -1;
3039 }
3040
3041 os_free(conn->altsubject_match);
3042 conn->altsubject_match = NULL;
3043 if (altsubject_match) {
3044 conn->altsubject_match = os_strdup(altsubject_match);
3045 if (conn->altsubject_match == NULL)
3046 return -1;
3047 }
3048
3049 os_free(conn->suffix_match);
3050 conn->suffix_match = NULL;
3051 if (suffix_match) {
3052 conn->suffix_match = os_strdup(suffix_match);
3053 if (conn->suffix_match == NULL)
3054 return -1;
3055 }
3056
3057 os_free(conn->domain_match);
3058 conn->domain_match = NULL;
3059 if (domain_match) {
3060 conn->domain_match = os_strdup(domain_match);
3061 if (conn->domain_match == NULL)
3062 return -1;
3063 }
3064
3065 os_free(conn->check_cert_subject);
3066 conn->check_cert_subject = NULL;
3067 if (check_cert_subject) {
3068 conn->check_cert_subject = os_strdup(check_cert_subject);
3069 if (!conn->check_cert_subject)
3070 return -1;
3071 }
3072
3073 return 0;
3074 }
3075
3076
3077 #ifdef CONFIG_SUITEB
suiteb_cert_cb(SSL * ssl,void * arg)3078 static int suiteb_cert_cb(SSL *ssl, void *arg)
3079 {
3080 struct tls_connection *conn = arg;
3081
3082 /*
3083 * This cert_cb() is not really the best location for doing a
3084 * constraint check for the ServerKeyExchange message, but this seems to
3085 * be the only place where the current OpenSSL sequence can be
3086 * terminated cleanly with an TLS alert going out to the server.
3087 */
3088
3089 if (!(conn->flags & TLS_CONN_SUITEB))
3090 return 1;
3091
3092 /* DHE is enabled only with DHE-RSA-AES256-GCM-SHA384 */
3093 if (conn->cipher_suite != 0x9f)
3094 return 1;
3095
3096 if (conn->server_dh_prime_len >= 3072)
3097 return 1;
3098
3099 wpa_printf(MSG_DEBUG,
3100 "OpenSSL: Server DH prime length (%d bits) not sufficient for Suite B RSA - reject handshake",
3101 conn->server_dh_prime_len);
3102 return 0;
3103 }
3104 #endif /* CONFIG_SUITEB */
3105
3106
tls_set_conn_flags(struct tls_connection * conn,unsigned int flags,const char * openssl_ciphers)3107 static int tls_set_conn_flags(struct tls_connection *conn, unsigned int flags,
3108 const char *openssl_ciphers)
3109 {
3110 SSL *ssl = conn->ssl;
3111
3112 #ifdef SSL_OP_NO_TICKET
3113 if (flags & TLS_CONN_DISABLE_SESSION_TICKET)
3114 SSL_set_options(ssl, SSL_OP_NO_TICKET);
3115 else
3116 SSL_clear_options(ssl, SSL_OP_NO_TICKET);
3117 #endif /* SSL_OP_NO_TICKET */
3118
3119 #ifdef SSL_OP_LEGACY_SERVER_CONNECT
3120 if (flags & TLS_CONN_ALLOW_UNSAFE_RENEGOTIATION)
3121 SSL_set_options(ssl, SSL_OP_LEGACY_SERVER_CONNECT);
3122 #endif /* SSL_OP_LEGACY_SERVER_CONNECT */
3123
3124 #ifdef SSL_OP_NO_TLSv1
3125 if (flags & TLS_CONN_DISABLE_TLSv1_0)
3126 SSL_set_options(ssl, SSL_OP_NO_TLSv1);
3127 else
3128 SSL_clear_options(ssl, SSL_OP_NO_TLSv1);
3129 #endif /* SSL_OP_NO_TLSv1 */
3130 #ifdef SSL_OP_NO_TLSv1_1
3131 if (flags & TLS_CONN_DISABLE_TLSv1_1)
3132 SSL_set_options(ssl, SSL_OP_NO_TLSv1_1);
3133 else
3134 SSL_clear_options(ssl, SSL_OP_NO_TLSv1_1);
3135 #endif /* SSL_OP_NO_TLSv1_1 */
3136 #ifdef SSL_OP_NO_TLSv1_2
3137 if (flags & TLS_CONN_DISABLE_TLSv1_2)
3138 SSL_set_options(ssl, SSL_OP_NO_TLSv1_2);
3139 else
3140 SSL_clear_options(ssl, SSL_OP_NO_TLSv1_2);
3141 #endif /* SSL_OP_NO_TLSv1_2 */
3142 #ifdef SSL_OP_NO_TLSv1_3
3143 if (flags & TLS_CONN_DISABLE_TLSv1_3)
3144 SSL_set_options(ssl, SSL_OP_NO_TLSv1_3);
3145 else
3146 SSL_clear_options(ssl, SSL_OP_NO_TLSv1_3);
3147 #endif /* SSL_OP_NO_TLSv1_3 */
3148 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
3149 if (flags & (TLS_CONN_ENABLE_TLSv1_0 |
3150 TLS_CONN_ENABLE_TLSv1_1 |
3151 TLS_CONN_ENABLE_TLSv1_2)) {
3152 int version = 0;
3153
3154 /* Explicit request to enable TLS versions even if needing to
3155 * override systemwide policies. */
3156 if (flags & TLS_CONN_ENABLE_TLSv1_0)
3157 version = TLS1_VERSION;
3158 else if (flags & TLS_CONN_ENABLE_TLSv1_1)
3159 version = TLS1_1_VERSION;
3160 else if (flags & TLS_CONN_ENABLE_TLSv1_2)
3161 version = TLS1_2_VERSION;
3162 if (!version) {
3163 wpa_printf(MSG_DEBUG,
3164 "OpenSSL: Invalid TLS version configuration");
3165 return -1;
3166 }
3167
3168 if (SSL_set_min_proto_version(ssl, version) != 1) {
3169 wpa_printf(MSG_DEBUG,
3170 "OpenSSL: Failed to set minimum TLS version");
3171 return -1;
3172 }
3173 }
3174 #endif /* >= 1.1.0 */
3175 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && \
3176 !defined(LIBRESSL_VERSION_NUMBER) && \
3177 !defined(OPENSSL_IS_BORINGSSL)
3178 {
3179 #if OPENSSL_VERSION_NUMBER >= 0x30000000L
3180 int need_level = 0;
3181 #else
3182 int need_level = 1;
3183 #endif
3184
3185 if ((flags &
3186 (TLS_CONN_ENABLE_TLSv1_0 | TLS_CONN_ENABLE_TLSv1_1)) &&
3187 SSL_get_security_level(ssl) > need_level) {
3188 /*
3189 * Need to drop to security level 1 (or 0 with OpenSSL
3190 * 3.0) to allow TLS versions older than 1.2 to be used
3191 * when explicitly enabled in configuration.
3192 */
3193 SSL_set_security_level(conn->ssl, need_level);
3194 }
3195 }
3196 #endif
3197
3198 if (!openssl_ciphers)
3199 openssl_ciphers = conn->data->openssl_ciphers;
3200
3201 #ifdef CONFIG_SUITEB
3202 #ifdef OPENSSL_IS_BORINGSSL
3203 /* Start with defaults from BoringSSL */
3204 SSL_CTX_set_verify_algorithm_prefs(conn->ssl_ctx, NULL, 0);
3205 #endif /* OPENSSL_IS_BORINGSSL */
3206 if (flags & TLS_CONN_SUITEB_NO_ECDH) {
3207 const char *ciphers = "DHE-RSA-AES256-GCM-SHA384";
3208
3209 if (openssl_ciphers) {
3210 wpa_printf(MSG_DEBUG,
3211 "OpenSSL: Override ciphers for Suite B (no ECDH): %s",
3212 openssl_ciphers);
3213 ciphers = openssl_ciphers;
3214 }
3215 if (SSL_set_cipher_list(ssl, ciphers) != 1) {
3216 wpa_printf(MSG_INFO,
3217 "OpenSSL: Failed to set Suite B ciphers");
3218 return -1;
3219 }
3220 } else if (flags & TLS_CONN_SUITEB) {
3221 #if OPENSSL_VERSION_NUMBER < 0x30000000L
3222 EC_KEY *ecdh;
3223 #endif
3224 const char *ciphers =
3225 "ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384";
3226 int nid[1] = { NID_secp384r1 };
3227
3228 if (openssl_ciphers) {
3229 wpa_printf(MSG_DEBUG,
3230 "OpenSSL: Override ciphers for Suite B: %s",
3231 openssl_ciphers);
3232 ciphers = openssl_ciphers;
3233 }
3234 if (SSL_set_cipher_list(ssl, ciphers) != 1) {
3235 wpa_printf(MSG_INFO,
3236 "OpenSSL: Failed to set Suite B ciphers");
3237 return -1;
3238 }
3239
3240 #if OPENSSL_VERSION_NUMBER >= 0x30000000L
3241 if (SSL_set1_groups(ssl, nid, 1) != 1) {
3242 wpa_printf(MSG_INFO,
3243 "OpenSSL: Failed to set Suite B groups");
3244 return -1;
3245 }
3246
3247 #else
3248 if (SSL_set1_curves(ssl, nid, 1) != 1) {
3249 wpa_printf(MSG_INFO,
3250 "OpenSSL: Failed to set Suite B curves");
3251 return -1;
3252 }
3253
3254 ecdh = EC_KEY_new_by_curve_name(NID_secp384r1);
3255 if (!ecdh || SSL_set_tmp_ecdh(ssl, ecdh) != 1) {
3256 EC_KEY_free(ecdh);
3257 wpa_printf(MSG_INFO,
3258 "OpenSSL: Failed to set ECDH parameter");
3259 return -1;
3260 }
3261 EC_KEY_free(ecdh);
3262 #endif
3263 }
3264 if (flags & (TLS_CONN_SUITEB | TLS_CONN_SUITEB_NO_ECDH)) {
3265 #ifdef OPENSSL_IS_BORINGSSL
3266 uint16_t sigalgs[3] = { SSL_SIGN_RSA_PKCS1_SHA384 };
3267 int num = 1;
3268
3269 if (!(flags & TLS_CONN_DISABLE_TLSv1_3)) {
3270 #ifdef SSL_SIGN_ECDSA_SECP384R1_SHA384
3271 sigalgs[num++] = SSL_SIGN_ECDSA_SECP384R1_SHA384;
3272 #endif
3273 #ifdef SSL_SIGN_RSA_PSS_RSAE_SHA384
3274 sigalgs[num++] = SSL_SIGN_RSA_PSS_RSAE_SHA384;
3275 #endif
3276 }
3277
3278 if (SSL_CTX_set_verify_algorithm_prefs(conn->ssl_ctx, sigalgs,
3279 num) != 1) {
3280 wpa_printf(MSG_INFO,
3281 "OpenSSL: Failed to set Suite B sigalgs");
3282 return -1;
3283 }
3284 #else /* OPENSSL_IS_BORINGSSL */
3285 /* ECDSA+SHA384 if need to add EC support here */
3286 const char *algs = "RSA+SHA384";
3287
3288 if (!(flags & TLS_CONN_DISABLE_TLSv1_3))
3289 algs = "RSA+SHA384:ecdsa_secp384r1_sha384:rsa_pss_rsae_sha384";
3290 if (SSL_set1_sigalgs_list(ssl, algs) != 1) {
3291 wpa_printf(MSG_INFO,
3292 "OpenSSL: Failed to set Suite B sigalgs");
3293 return -1;
3294 }
3295 #endif /* OPENSSL_IS_BORINGSSL */
3296
3297 SSL_set_options(ssl, SSL_OP_NO_TLSv1);
3298 SSL_set_options(ssl, SSL_OP_NO_TLSv1_1);
3299 SSL_set_cert_cb(ssl, suiteb_cert_cb, conn);
3300 }
3301
3302 #ifdef OPENSSL_IS_BORINGSSL
3303 if (openssl_ciphers && os_strcmp(openssl_ciphers, "SUITEB192") == 0) {
3304 uint16_t sigalgs[1] = { SSL_SIGN_ECDSA_SECP384R1_SHA384 };
3305 int nid[1] = { NID_secp384r1 };
3306
3307 if (SSL_set1_curves(ssl, nid, 1) != 1) {
3308 wpa_printf(MSG_INFO,
3309 "OpenSSL: Failed to set Suite B curves");
3310 return -1;
3311 }
3312
3313 if (SSL_CTX_set_verify_algorithm_prefs(conn->ssl_ctx, sigalgs,
3314 1) != 1) {
3315 wpa_printf(MSG_INFO,
3316 "OpenSSL: Failed to set Suite B sigalgs");
3317 return -1;
3318 }
3319 }
3320 #else /* OPENSSL_IS_BORINGSSL */
3321 if (!(flags & (TLS_CONN_SUITEB | TLS_CONN_SUITEB_NO_ECDH)) &&
3322 openssl_ciphers && SSL_set_cipher_list(ssl, openssl_ciphers) != 1) {
3323 wpa_printf(MSG_INFO,
3324 "OpenSSL: Failed to set openssl_ciphers '%s'",
3325 openssl_ciphers);
3326 return -1;
3327 }
3328 #endif /* OPENSSL_IS_BORINGSSL */
3329 #else /* CONFIG_SUITEB */
3330 if (openssl_ciphers && SSL_set_cipher_list(ssl, openssl_ciphers) != 1) {
3331 wpa_printf(MSG_INFO,
3332 "OpenSSL: Failed to set openssl_ciphers '%s'",
3333 openssl_ciphers);
3334 return -1;
3335 }
3336 #endif /* CONFIG_SUITEB */
3337
3338 if (flags & TLS_CONN_TEAP_ANON_DH) {
3339 #ifndef TEAP_DH_ANON_CS
3340 #define TEAP_DH_ANON_CS \
3341 "ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:" \
3342 "ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:" \
3343 "ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:" \
3344 "DHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:" \
3345 "DHE-RSA-AES256-SHA256:DHE-RSA-AES128-SHA256:" \
3346 "DHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA:" \
3347 "ADH-AES256-GCM-SHA384:ADH-AES128-GCM-SHA256:" \
3348 "ADH-AES256-SHA256:ADH-AES128-SHA256:ADH-AES256-SHA:ADH-AES128-SHA"
3349 #endif
3350 static const char *cs = TEAP_DH_ANON_CS;
3351
3352 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && \
3353 !defined(LIBRESSL_VERSION_NUMBER) && \
3354 !defined(OPENSSL_IS_BORINGSSL)
3355 /*
3356 * Need to drop to security level 0 to allow anonymous
3357 * cipher suites for EAP-TEAP.
3358 */
3359 SSL_set_security_level(conn->ssl, 0);
3360 #endif
3361
3362 wpa_printf(MSG_DEBUG,
3363 "OpenSSL: Enable cipher suites for anonymous EAP-TEAP provisioning: %s",
3364 cs);
3365 if (SSL_set_cipher_list(conn->ssl, cs) != 1) {
3366 tls_show_errors(MSG_INFO, __func__,
3367 "Cipher suite configuration failed");
3368 return -1;
3369 }
3370 }
3371
3372 return 0;
3373 }
3374
3375
tls_connection_set_verify(void * ssl_ctx,struct tls_connection * conn,int verify_peer,unsigned int flags,const u8 * session_ctx,size_t session_ctx_len)3376 int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
3377 int verify_peer, unsigned int flags,
3378 const u8 *session_ctx, size_t session_ctx_len)
3379 {
3380 static int counter = 0;
3381 struct tls_data *data = ssl_ctx;
3382
3383 if (conn == NULL)
3384 return -1;
3385
3386 if (verify_peer == 2) {
3387 conn->ca_cert_verify = 1;
3388 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER |
3389 SSL_VERIFY_CLIENT_ONCE, tls_verify_cb);
3390 } else if (verify_peer) {
3391 conn->ca_cert_verify = 1;
3392 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER |
3393 SSL_VERIFY_FAIL_IF_NO_PEER_CERT |
3394 SSL_VERIFY_CLIENT_ONCE, tls_verify_cb);
3395 } else {
3396 conn->ca_cert_verify = 0;
3397 SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
3398 }
3399
3400 if (tls_set_conn_flags(conn, flags, NULL) < 0)
3401 return -1;
3402 conn->flags = flags;
3403
3404 SSL_set_accept_state(conn->ssl);
3405
3406 if (data->tls_session_lifetime == 0) {
3407 /*
3408 * Set session id context to a unique value to make sure
3409 * session resumption cannot be used either through session
3410 * caching or TLS ticket extension.
3411 */
3412 counter++;
3413 SSL_set_session_id_context(conn->ssl,
3414 (const unsigned char *) &counter,
3415 sizeof(counter));
3416 } else if (session_ctx) {
3417 SSL_set_session_id_context(conn->ssl, session_ctx,
3418 session_ctx_len);
3419 }
3420
3421 return 0;
3422 }
3423
3424
tls_connection_client_cert(struct tls_connection * conn,const char * client_cert,const u8 * client_cert_blob,size_t client_cert_blob_len)3425 static int tls_connection_client_cert(struct tls_connection *conn,
3426 const char *client_cert,
3427 const u8 *client_cert_blob,
3428 size_t client_cert_blob_len)
3429 {
3430 if (client_cert == NULL && client_cert_blob == NULL)
3431 return 0;
3432
3433 #ifdef PKCS12_FUNCS
3434 #ifdef LIBRESSL_VERSION_NUMBER
3435 /*
3436 * Clear previously set extra chain certificates, if any, from PKCS#12
3437 * processing in tls_parse_pkcs12() to allow LibreSSL to build a new
3438 * chain properly.
3439 */
3440 SSL_CTX_clear_extra_chain_certs(conn->ssl_ctx);
3441 #endif /* LIBRESSL_VERSION_NUMBER */
3442 #endif /* PKCS12_FUNCS */
3443
3444 if (client_cert_blob &&
3445 SSL_use_certificate_ASN1(conn->ssl, (u8 *) client_cert_blob,
3446 client_cert_blob_len) == 1) {
3447 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_ASN1 --> "
3448 "OK");
3449 return 0;
3450 } else if (client_cert_blob) {
3451 #if defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x20901000L
3452 tls_show_errors(MSG_DEBUG, __func__,
3453 "SSL_use_certificate_ASN1 failed");
3454 #else
3455 BIO *bio;
3456 X509 *x509;
3457
3458 tls_show_errors(MSG_DEBUG, __func__,
3459 "SSL_use_certificate_ASN1 failed");
3460 bio = BIO_new(BIO_s_mem());
3461 if (!bio)
3462 return -1;
3463 BIO_write(bio, client_cert_blob, client_cert_blob_len);
3464 x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);
3465 if (!x509 || SSL_use_certificate(conn->ssl, x509) != 1) {
3466 X509_free(x509);
3467 BIO_free(bio);
3468 return -1;
3469 }
3470 X509_free(x509);
3471 wpa_printf(MSG_DEBUG,
3472 "OpenSSL: Found PEM encoded certificate from blob");
3473 while ((x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL))) {
3474 wpa_printf(MSG_DEBUG,
3475 "OpenSSL: Added an additional certificate into the chain");
3476 SSL_add0_chain_cert(conn->ssl, x509);
3477 }
3478 BIO_free(bio);
3479 return 0;
3480 #endif
3481 }
3482
3483 if (client_cert == NULL)
3484 return -1;
3485
3486 #ifdef ANDROID
3487 if (os_strncmp("keystore://", client_cert, 11) == 0) {
3488 BIO *bio = BIO_from_keystore(&client_cert[11]);
3489 X509 *x509 = NULL;
3490 int ret = -1;
3491 if (bio) {
3492 x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);
3493 }
3494 if (x509) {
3495 if (SSL_use_certificate(conn->ssl, x509) == 1)
3496 ret = 0;
3497 X509_free(x509);
3498 }
3499
3500 /* Read additional certificates into the chain. */
3501 while (bio) {
3502 x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);
3503 if (x509) {
3504 /* Takes ownership of x509 */
3505 SSL_add0_chain_cert(conn->ssl, x509);
3506 } else {
3507 BIO_free(bio);
3508 bio = NULL;
3509 }
3510 }
3511 return ret;
3512 }
3513 #endif /* ANDROID */
3514
3515 #ifndef OPENSSL_NO_STDIO
3516 if (SSL_use_certificate_file(conn->ssl, client_cert,
3517 SSL_FILETYPE_ASN1) == 1) {
3518 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (DER)"
3519 " --> OK");
3520 return 0;
3521 }
3522
3523 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && \
3524 !defined(LIBRESSL_VERSION_NUMBER) && !defined(OPENSSL_IS_BORINGSSL)
3525 if (SSL_use_certificate_chain_file(conn->ssl, client_cert) == 1) {
3526 ERR_clear_error();
3527 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_chain_file"
3528 " --> OK");
3529 return 0;
3530 }
3531 #else
3532 if (SSL_use_certificate_file(conn->ssl, client_cert,
3533 SSL_FILETYPE_PEM) == 1) {
3534 ERR_clear_error();
3535 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (PEM)"
3536 " --> OK");
3537 return 0;
3538 }
3539 #endif
3540
3541 tls_show_errors(MSG_DEBUG, __func__,
3542 "SSL_use_certificate_file failed");
3543 #else /* OPENSSL_NO_STDIO */
3544 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
3545 #endif /* OPENSSL_NO_STDIO */
3546
3547 return -1;
3548 }
3549
3550
tls_global_client_cert(struct tls_data * data,const char * client_cert)3551 static int tls_global_client_cert(struct tls_data *data,
3552 const char *client_cert)
3553 {
3554 #ifndef OPENSSL_NO_STDIO
3555 SSL_CTX *ssl_ctx = data->ssl;
3556
3557 if (client_cert == NULL)
3558 return 0;
3559
3560 if (SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
3561 SSL_FILETYPE_ASN1) != 1 &&
3562 SSL_CTX_use_certificate_chain_file(ssl_ctx, client_cert) != 1 &&
3563 SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
3564 SSL_FILETYPE_PEM) != 1) {
3565 tls_show_errors(MSG_INFO, __func__,
3566 "Failed to load client certificate");
3567 return -1;
3568 }
3569 return 0;
3570 #else /* OPENSSL_NO_STDIO */
3571 if (client_cert == NULL)
3572 return 0;
3573 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
3574 return -1;
3575 #endif /* OPENSSL_NO_STDIO */
3576 }
3577
3578
3579 #ifdef PKCS12_FUNCS
tls_parse_pkcs12(struct tls_data * data,SSL * ssl,PKCS12 * p12,const char * passwd)3580 static int tls_parse_pkcs12(struct tls_data *data, SSL *ssl, PKCS12 *p12,
3581 const char *passwd)
3582 {
3583 EVP_PKEY *pkey;
3584 X509 *cert;
3585 STACK_OF(X509) *certs;
3586 int res = 0;
3587 char buf[256];
3588
3589 pkey = NULL;
3590 cert = NULL;
3591 certs = NULL;
3592 if (!passwd)
3593 passwd = "";
3594 if (!PKCS12_parse(p12, passwd, &pkey, &cert, &certs)) {
3595 tls_show_errors(MSG_DEBUG, __func__,
3596 "Failed to parse PKCS12 file");
3597 PKCS12_free(p12);
3598 return -1;
3599 }
3600 wpa_printf(MSG_DEBUG, "TLS: Successfully parsed PKCS12 data");
3601
3602 if (cert) {
3603 X509_NAME_oneline(X509_get_subject_name(cert), buf,
3604 sizeof(buf));
3605 wpa_printf(MSG_DEBUG, "TLS: Got certificate from PKCS12: "
3606 "subject='%s'", buf);
3607 if (ssl) {
3608 if (SSL_use_certificate(ssl, cert) != 1)
3609 res = -1;
3610 } else {
3611 if (SSL_CTX_use_certificate(data->ssl, cert) != 1)
3612 res = -1;
3613 }
3614 X509_free(cert);
3615 }
3616
3617 if (pkey) {
3618 wpa_printf(MSG_DEBUG, "TLS: Got private key from PKCS12");
3619 if (ssl) {
3620 if (SSL_use_PrivateKey(ssl, pkey) != 1)
3621 res = -1;
3622 } else {
3623 if (SSL_CTX_use_PrivateKey(data->ssl, pkey) != 1)
3624 res = -1;
3625 }
3626 EVP_PKEY_free(pkey);
3627 }
3628
3629 if (certs) {
3630 #ifndef LIBRESSL_VERSION_NUMBER
3631 if (ssl)
3632 SSL_clear_chain_certs(ssl);
3633 else
3634 SSL_CTX_clear_chain_certs(data->ssl);
3635 while ((cert = sk_X509_pop(certs)) != NULL) {
3636 X509_NAME_oneline(X509_get_subject_name(cert), buf,
3637 sizeof(buf));
3638 wpa_printf(MSG_DEBUG, "TLS: additional certificate"
3639 " from PKCS12: subject='%s'", buf);
3640 if ((ssl && SSL_add1_chain_cert(ssl, cert) != 1) ||
3641 (!ssl && SSL_CTX_add1_chain_cert(data->ssl,
3642 cert) != 1)) {
3643 tls_show_errors(MSG_DEBUG, __func__,
3644 "Failed to add additional certificate");
3645 res = -1;
3646 X509_free(cert);
3647 break;
3648 }
3649 X509_free(cert);
3650 }
3651 if (!res) {
3652 /* Try to continue anyway */
3653 }
3654 sk_X509_pop_free(certs, X509_free);
3655 #ifndef OPENSSL_IS_BORINGSSL
3656 if (ssl)
3657 res = SSL_build_cert_chain(
3658 ssl,
3659 SSL_BUILD_CHAIN_FLAG_CHECK |
3660 SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR);
3661 else
3662 res = SSL_CTX_build_cert_chain(
3663 data->ssl,
3664 SSL_BUILD_CHAIN_FLAG_CHECK |
3665 SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR);
3666 if (!res) {
3667 tls_show_errors(MSG_DEBUG, __func__,
3668 "Failed to build certificate chain");
3669 } else if (res == 2) {
3670 wpa_printf(MSG_DEBUG,
3671 "TLS: Ignore certificate chain verification error when building chain with PKCS#12 extra certificates");
3672 }
3673 #endif /* OPENSSL_IS_BORINGSSL */
3674 /*
3675 * Try to continue regardless of result since it is possible for
3676 * the extra certificates not to be required.
3677 */
3678 res = 0;
3679 #else /* LIBRESSL_VERSION_NUMBER */
3680 SSL_CTX_clear_extra_chain_certs(data->ssl);
3681 while ((cert = sk_X509_pop(certs)) != NULL) {
3682 X509_NAME_oneline(X509_get_subject_name(cert), buf,
3683 sizeof(buf));
3684 wpa_printf(MSG_DEBUG, "TLS: additional certificate"
3685 " from PKCS12: subject='%s'", buf);
3686 /*
3687 * There is no SSL equivalent for the chain cert - so
3688 * always add it to the context...
3689 */
3690 if (SSL_CTX_add_extra_chain_cert(data->ssl, cert) != 1)
3691 {
3692 X509_free(cert);
3693 res = -1;
3694 break;
3695 }
3696 }
3697 sk_X509_pop_free(certs, X509_free);
3698 #endif /* LIBRSESSL_VERSION_NUMBER */
3699 }
3700
3701 PKCS12_free(p12);
3702
3703 if (res < 0)
3704 tls_get_errors(data);
3705
3706 return res;
3707 }
3708 #endif /* PKCS12_FUNCS */
3709
3710
tls_read_pkcs12(struct tls_data * data,SSL * ssl,const char * private_key,const char * passwd)3711 static int tls_read_pkcs12(struct tls_data *data, SSL *ssl,
3712 const char *private_key, const char *passwd)
3713 {
3714 #ifdef PKCS12_FUNCS
3715 FILE *f;
3716 PKCS12 *p12;
3717
3718 f = fopen(private_key, "rb");
3719 if (f == NULL)
3720 return -1;
3721
3722 p12 = d2i_PKCS12_fp(f, NULL);
3723 fclose(f);
3724
3725 if (p12 == NULL) {
3726 tls_show_errors(MSG_INFO, __func__,
3727 "Failed to use PKCS#12 file");
3728 return -1;
3729 }
3730
3731 return tls_parse_pkcs12(data, ssl, p12, passwd);
3732
3733 #else /* PKCS12_FUNCS */
3734 wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot read "
3735 "p12/pfx files");
3736 return -1;
3737 #endif /* PKCS12_FUNCS */
3738 }
3739
3740
tls_read_pkcs12_blob(struct tls_data * data,SSL * ssl,const u8 * blob,size_t len,const char * passwd)3741 static int tls_read_pkcs12_blob(struct tls_data *data, SSL *ssl,
3742 const u8 *blob, size_t len, const char *passwd)
3743 {
3744 #ifdef PKCS12_FUNCS
3745 PKCS12 *p12;
3746
3747 p12 = d2i_PKCS12(NULL, (const unsigned char **) &blob, len);
3748 if (p12 == NULL) {
3749 tls_show_errors(MSG_INFO, __func__,
3750 "Failed to use PKCS#12 blob");
3751 return -1;
3752 }
3753
3754 return tls_parse_pkcs12(data, ssl, p12, passwd);
3755
3756 #else /* PKCS12_FUNCS */
3757 wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot parse "
3758 "p12/pfx blobs");
3759 return -1;
3760 #endif /* PKCS12_FUNCS */
3761 }
3762
3763
3764 #ifndef OPENSSL_NO_ENGINE
tls_engine_get_cert(struct tls_connection * conn,const char * cert_id,X509 ** cert)3765 static int tls_engine_get_cert(struct tls_connection *conn,
3766 const char *cert_id,
3767 X509 **cert)
3768 {
3769 /* this runs after the private key is loaded so no PIN is required */
3770 struct {
3771 const char *cert_id;
3772 X509 *cert;
3773 } params;
3774 params.cert_id = cert_id;
3775 params.cert = NULL;
3776
3777 if (!ENGINE_ctrl_cmd(conn->engine, "LOAD_CERT_CTRL",
3778 0, ¶ms, NULL, 1)) {
3779 unsigned long err = ERR_get_error();
3780
3781 wpa_printf(MSG_ERROR, "ENGINE: cannot load client cert with id"
3782 " '%s' [%s]", cert_id,
3783 ERR_error_string(err, NULL));
3784 if (tls_is_pin_error(err))
3785 return TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN;
3786 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
3787 }
3788 if (!params.cert) {
3789 wpa_printf(MSG_ERROR, "ENGINE: did not properly cert with id"
3790 " '%s'", cert_id);
3791 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
3792 }
3793 *cert = params.cert;
3794 return 0;
3795 }
3796 #endif /* OPENSSL_NO_ENGINE */
3797
3798
tls_connection_engine_client_cert(struct tls_connection * conn,const char * cert_id)3799 static int tls_connection_engine_client_cert(struct tls_connection *conn,
3800 const char *cert_id)
3801 {
3802 #ifndef OPENSSL_NO_ENGINE
3803 X509 *cert;
3804
3805 if (tls_engine_get_cert(conn, cert_id, &cert))
3806 return -1;
3807
3808 if (!SSL_use_certificate(conn->ssl, cert)) {
3809 tls_show_errors(MSG_ERROR, __func__,
3810 "SSL_use_certificate failed");
3811 X509_free(cert);
3812 return -1;
3813 }
3814 X509_free(cert);
3815 wpa_printf(MSG_DEBUG, "ENGINE: SSL_use_certificate --> "
3816 "OK");
3817 return 0;
3818
3819 #else /* OPENSSL_NO_ENGINE */
3820 return -1;
3821 #endif /* OPENSSL_NO_ENGINE */
3822 }
3823
3824
tls_connection_engine_ca_cert(struct tls_data * data,struct tls_connection * conn,const char * ca_cert_id)3825 static int tls_connection_engine_ca_cert(struct tls_data *data,
3826 struct tls_connection *conn,
3827 const char *ca_cert_id)
3828 {
3829 #ifndef OPENSSL_NO_ENGINE
3830 X509 *cert;
3831 SSL_CTX *ssl_ctx = data->ssl;
3832 X509_STORE *store;
3833
3834 if (tls_engine_get_cert(conn, ca_cert_id, &cert))
3835 return -1;
3836
3837 /* start off the same as tls_connection_ca_cert */
3838 store = X509_STORE_new();
3839 if (store == NULL) {
3840 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
3841 "certificate store", __func__);
3842 X509_free(cert);
3843 return -1;
3844 }
3845 SSL_CTX_set_cert_store(ssl_ctx, store);
3846 if (!X509_STORE_add_cert(store, cert)) {
3847 unsigned long err = ERR_peek_error();
3848 tls_show_errors(MSG_WARNING, __func__,
3849 "Failed to add CA certificate from engine "
3850 "to certificate store");
3851 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
3852 ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
3853 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring cert"
3854 " already in hash table error",
3855 __func__);
3856 } else {
3857 X509_free(cert);
3858 return -1;
3859 }
3860 }
3861 X509_free(cert);
3862 wpa_printf(MSG_DEBUG, "OpenSSL: %s - added CA certificate from engine "
3863 "to certificate store", __func__);
3864 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
3865 conn->ca_cert_verify = 1;
3866
3867 return 0;
3868
3869 #else /* OPENSSL_NO_ENGINE */
3870 return -1;
3871 #endif /* OPENSSL_NO_ENGINE */
3872 }
3873
3874
tls_connection_engine_private_key(struct tls_connection * conn)3875 static int tls_connection_engine_private_key(struct tls_connection *conn)
3876 {
3877 #if defined(ANDROID) || !defined(OPENSSL_NO_ENGINE)
3878 if (SSL_use_PrivateKey(conn->ssl, conn->private_key) != 1) {
3879 tls_show_errors(MSG_ERROR, __func__,
3880 "ENGINE: cannot use private key for TLS");
3881 return -1;
3882 }
3883 if (!SSL_check_private_key(conn->ssl)) {
3884 tls_show_errors(MSG_INFO, __func__,
3885 "Private key failed verification");
3886 return -1;
3887 }
3888 return 0;
3889 #else /* OPENSSL_NO_ENGINE */
3890 wpa_printf(MSG_ERROR, "SSL: Configuration uses engine, but "
3891 "engine support was not compiled in");
3892 return -1;
3893 #endif /* OPENSSL_NO_ENGINE */
3894 }
3895
3896
3897 #ifndef OPENSSL_NO_STDIO
tls_passwd_cb(char * buf,int size,int rwflag,void * password)3898 static int tls_passwd_cb(char *buf, int size, int rwflag, void *password)
3899 {
3900 if (!password)
3901 return 0;
3902 os_strlcpy(buf, (const char *) password, size);
3903 return os_strlen(buf);
3904 }
3905 #endif /* OPENSSL_NO_STDIO */
3906
3907
tls_use_private_key_file(struct tls_data * data,SSL * ssl,const char * private_key,const char * private_key_passwd)3908 static int tls_use_private_key_file(struct tls_data *data, SSL *ssl,
3909 const char *private_key,
3910 const char *private_key_passwd)
3911 {
3912 #ifndef OPENSSL_NO_STDIO
3913 BIO *bio;
3914 EVP_PKEY *pkey;
3915 int ret;
3916
3917 /* First try ASN.1 (DER). */
3918 bio = BIO_new_file(private_key, "r");
3919 if (!bio)
3920 return -1;
3921 pkey = d2i_PrivateKey_bio(bio, NULL);
3922 BIO_free(bio);
3923
3924 if (pkey) {
3925 wpa_printf(MSG_DEBUG, "OpenSSL: %s (DER) --> loaded", __func__);
3926 } else {
3927 /* Try PEM with the provided password. */
3928 bio = BIO_new_file(private_key, "r");
3929 if (!bio)
3930 return -1;
3931 pkey = PEM_read_bio_PrivateKey(bio, NULL, tls_passwd_cb,
3932 (void *) private_key_passwd);
3933 BIO_free(bio);
3934 if (!pkey)
3935 return -1;
3936 wpa_printf(MSG_DEBUG, "OpenSSL: %s (PEM) --> loaded", __func__);
3937 /* Clear errors from the previous failed load. */
3938 ERR_clear_error();
3939 }
3940
3941 if (ssl)
3942 ret = SSL_use_PrivateKey(ssl, pkey);
3943 else
3944 ret = SSL_CTX_use_PrivateKey(data->ssl, pkey);
3945
3946 EVP_PKEY_free(pkey);
3947 return ret == 1 ? 0 : -1;
3948 #else /* OPENSSL_NO_STDIO */
3949 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
3950 return -1;
3951 #endif /* OPENSSL_NO_STDIO */
3952 }
3953
3954
tls_connection_private_key(struct tls_data * data,struct tls_connection * conn,const char * private_key,const char * private_key_passwd,const u8 * private_key_blob,size_t private_key_blob_len)3955 static int tls_connection_private_key(struct tls_data *data,
3956 struct tls_connection *conn,
3957 const char *private_key,
3958 const char *private_key_passwd,
3959 const u8 *private_key_blob,
3960 size_t private_key_blob_len)
3961 {
3962 BIO *bio;
3963 int ok;
3964
3965 if (private_key == NULL && private_key_blob == NULL)
3966 return 0;
3967
3968 ok = 0;
3969 while (private_key_blob) {
3970 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA, conn->ssl,
3971 (u8 *) private_key_blob,
3972 private_key_blob_len) == 1) {
3973 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
3974 "ASN1(EVP_PKEY_RSA) --> OK");
3975 ok = 1;
3976 break;
3977 }
3978
3979 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA, conn->ssl,
3980 (u8 *) private_key_blob,
3981 private_key_blob_len) == 1) {
3982 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
3983 "ASN1(EVP_PKEY_DSA) --> OK");
3984 ok = 1;
3985 break;
3986 }
3987
3988 #ifndef OPENSSL_NO_EC
3989 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_EC, conn->ssl,
3990 (u8 *) private_key_blob,
3991 private_key_blob_len) == 1) {
3992 wpa_printf(MSG_DEBUG,
3993 "OpenSSL: SSL_use_PrivateKey_ASN1(EVP_PKEY_EC) --> OK");
3994 ok = 1;
3995 break;
3996 }
3997 #endif /* OPENSSL_NO_EC */
3998
3999 #if OPENSSL_VERSION_NUMBER < 0x30000000L
4000 if (SSL_use_RSAPrivateKey_ASN1(conn->ssl,
4001 (u8 *) private_key_blob,
4002 private_key_blob_len) == 1) {
4003 wpa_printf(MSG_DEBUG, "OpenSSL: "
4004 "SSL_use_RSAPrivateKey_ASN1 --> OK");
4005 ok = 1;
4006 break;
4007 }
4008 #endif
4009
4010 bio = BIO_new_mem_buf((u8 *) private_key_blob,
4011 private_key_blob_len);
4012 if (bio) {
4013 EVP_PKEY *pkey;
4014
4015 pkey = PEM_read_bio_PrivateKey(
4016 bio, NULL, tls_passwd_cb,
4017 (void *) private_key_passwd);
4018 if (pkey) {
4019 if (SSL_use_PrivateKey(conn->ssl, pkey) == 1) {
4020 wpa_printf(MSG_DEBUG,
4021 "OpenSSL: SSL_use_PrivateKey --> OK");
4022 ok = 1;
4023 EVP_PKEY_free(pkey);
4024 BIO_free(bio);
4025 break;
4026 }
4027 EVP_PKEY_free(pkey);
4028 }
4029 BIO_free(bio);
4030 }
4031
4032 if (tls_read_pkcs12_blob(data, conn->ssl, private_key_blob,
4033 private_key_blob_len,
4034 private_key_passwd) == 0) {
4035 wpa_printf(MSG_DEBUG, "OpenSSL: PKCS#12 as blob --> "
4036 "OK");
4037 ok = 1;
4038 break;
4039 }
4040
4041 break;
4042 }
4043
4044 while (!ok && private_key) {
4045 if (tls_use_private_key_file(data, conn->ssl, private_key,
4046 private_key_passwd) == 0) {
4047 ok = 1;
4048 break;
4049 }
4050
4051 if (tls_read_pkcs12(data, conn->ssl, private_key,
4052 private_key_passwd) == 0) {
4053 wpa_printf(MSG_DEBUG, "OpenSSL: Reading PKCS#12 file "
4054 "--> OK");
4055 ok = 1;
4056 break;
4057 }
4058
4059 if (tls_cryptoapi_cert(conn->ssl, private_key) == 0) {
4060 wpa_printf(MSG_DEBUG, "OpenSSL: Using CryptoAPI to "
4061 "access certificate store --> OK");
4062 ok = 1;
4063 break;
4064 }
4065
4066 break;
4067 }
4068
4069 if (!ok) {
4070 tls_show_errors(MSG_INFO, __func__,
4071 "Failed to load private key");
4072 return -1;
4073 }
4074 ERR_clear_error();
4075
4076 if (!SSL_check_private_key(conn->ssl)) {
4077 tls_show_errors(MSG_INFO, __func__, "Private key failed "
4078 "verification");
4079 return -1;
4080 }
4081
4082 wpa_printf(MSG_DEBUG, "SSL: Private key loaded successfully");
4083 return 0;
4084 }
4085
4086
tls_global_private_key(struct tls_data * data,const char * private_key,const char * private_key_passwd)4087 static int tls_global_private_key(struct tls_data *data,
4088 const char *private_key,
4089 const char *private_key_passwd)
4090 {
4091 SSL_CTX *ssl_ctx = data->ssl;
4092
4093 if (private_key == NULL)
4094 return 0;
4095
4096 if (tls_use_private_key_file(data, NULL, private_key,
4097 private_key_passwd) &&
4098 tls_read_pkcs12(data, NULL, private_key, private_key_passwd)) {
4099 tls_show_errors(MSG_INFO, __func__,
4100 "Failed to load private key");
4101 ERR_clear_error();
4102 return -1;
4103 }
4104 ERR_clear_error();
4105
4106 if (!SSL_CTX_check_private_key(ssl_ctx)) {
4107 tls_show_errors(MSG_INFO, __func__,
4108 "Private key failed verification");
4109 return -1;
4110 }
4111
4112 return 0;
4113 }
4114
4115
4116 #if OPENSSL_VERSION_NUMBER >= 0x30000000L
4117 #ifndef OPENSSL_NO_DH
4118 #ifndef OPENSSL_NO_DSA
4119 /* This is needed to replace the deprecated DSA_dup_DH() function */
openssl_dsa_to_dh(EVP_PKEY * dsa)4120 static EVP_PKEY * openssl_dsa_to_dh(EVP_PKEY *dsa)
4121 {
4122 OSSL_PARAM_BLD *bld = NULL;
4123 OSSL_PARAM *params = NULL;
4124 BIGNUM *p = NULL, *q = NULL, *g = NULL;
4125 EVP_PKEY_CTX *ctx = NULL;
4126 EVP_PKEY *pkey = NULL;
4127
4128 if (!EVP_PKEY_get_bn_param(dsa, OSSL_PKEY_PARAM_FFC_P, &p) ||
4129 !EVP_PKEY_get_bn_param(dsa, OSSL_PKEY_PARAM_FFC_Q, &q) ||
4130 !EVP_PKEY_get_bn_param(dsa, OSSL_PKEY_PARAM_FFC_G, &g) ||
4131 !(bld = OSSL_PARAM_BLD_new()) ||
4132 !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_FFC_P, p) ||
4133 !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_FFC_Q, q) ||
4134 !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_FFC_G, g) ||
4135 !(params = OSSL_PARAM_BLD_to_param(bld)) ||
4136 !(ctx = EVP_PKEY_CTX_new_from_name(NULL, "DHX", NULL)) ||
4137 EVP_PKEY_fromdata_init(ctx) != 1 ||
4138 EVP_PKEY_fromdata(ctx, &pkey, EVP_PKEY_KEY_PARAMETERS,
4139 params) != 1)
4140 wpa_printf(MSG_INFO,
4141 "TLS: Failed to convert DSA parameters to DH parameters");
4142
4143 EVP_PKEY_CTX_free(ctx);
4144 OSSL_PARAM_free(params);
4145 OSSL_PARAM_BLD_free(bld);
4146 BN_free(p);
4147 BN_free(q);
4148 BN_free(g);
4149 return pkey;
4150 }
4151 #endif /* !OPENSSL_NO_DSA */
4152 #endif /* OPENSSL_NO_DH */
4153 #endif /* OpenSSL version >= 3.0 */
4154
tls_global_dh(struct tls_data * data,const char * dh_file)4155 static int tls_global_dh(struct tls_data *data, const char *dh_file)
4156 {
4157 #ifdef OPENSSL_NO_DH
4158 if (dh_file == NULL)
4159 return 0;
4160 wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
4161 "dh_file specified");
4162 return -1;
4163 #else /* OPENSSL_NO_DH */
4164 #if OPENSSL_VERSION_NUMBER >= 0x30000000L
4165 SSL_CTX *ssl_ctx = data->ssl;
4166 BIO *bio;
4167 OSSL_DECODER_CTX *ctx = NULL;
4168 EVP_PKEY *pkey = NULL, *tmpkey = NULL;
4169 bool dsa = false;
4170
4171 if (!ssl_ctx)
4172 return -1;
4173 if (!dh_file) {
4174 SSL_CTX_set_dh_auto(ssl_ctx, 1);
4175 return 0;
4176 }
4177
4178 bio = BIO_new_file(dh_file, "r");
4179 if (!bio) {
4180 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
4181 dh_file, ERR_error_string(ERR_get_error(), NULL));
4182 return -1;
4183 }
4184 ctx = OSSL_DECODER_CTX_new_for_pkey(
4185 &tmpkey, "PEM", NULL, NULL,
4186 OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS, NULL, NULL);
4187 if (!ctx ||
4188 OSSL_DECODER_from_bio(ctx, bio) != 1) {
4189 wpa_printf(MSG_INFO,
4190 "TLS: Failed to decode domain parameters from '%s': %s",
4191 dh_file, ERR_error_string(ERR_get_error(), NULL));
4192 BIO_free(bio);
4193 OSSL_DECODER_CTX_free(ctx);
4194 return -1;
4195 }
4196 OSSL_DECODER_CTX_free(ctx);
4197 BIO_free(bio);
4198
4199 if (!tmpkey) {
4200 wpa_printf(MSG_INFO, "TLS: Failed to load domain parameters");
4201 return -1;
4202 }
4203
4204 #ifndef OPENSSL_NO_DSA
4205 if (EVP_PKEY_is_a(tmpkey, "DSA")) {
4206 pkey = openssl_dsa_to_dh(tmpkey);
4207 EVP_PKEY_free(tmpkey);
4208 if (!pkey)
4209 return -1;
4210 dsa = true;
4211 }
4212 #endif /* !OPENSSL_NO_DSA */
4213 if (!dsa) {
4214 if (EVP_PKEY_is_a(tmpkey, "DH") ||
4215 EVP_PKEY_is_a(tmpkey, "DHX")) {
4216 } else {
4217 wpa_printf(MSG_INFO,
4218 "TLS: No DH parameters found in %s",
4219 dh_file);
4220 EVP_PKEY_free(tmpkey);
4221 return -1;
4222 }
4223 pkey = tmpkey;
4224 tmpkey = NULL;
4225 }
4226
4227 if (SSL_CTX_set0_tmp_dh_pkey(ssl_ctx, pkey) != 1) {
4228 wpa_printf(MSG_INFO,
4229 "TLS: Failed to set DH params from '%s': %s",
4230 dh_file, ERR_error_string(ERR_get_error(), NULL));
4231 EVP_PKEY_free(pkey);
4232 return -1;
4233 }
4234 return 0;
4235 #else /* OpenSSL version >= 3.0 */
4236 SSL_CTX *ssl_ctx = data->ssl;
4237 DH *dh;
4238 BIO *bio;
4239
4240 if (!ssl_ctx)
4241 return -1;
4242 if (!dh_file) {
4243 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(OPENSSL_IS_BORINGSSL)
4244 SSL_CTX_set_dh_auto(ssl_ctx, 1);
4245 #endif
4246 return 0;
4247 }
4248
4249 bio = BIO_new_file(dh_file, "r");
4250 if (bio == NULL) {
4251 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
4252 dh_file, ERR_error_string(ERR_get_error(), NULL));
4253 return -1;
4254 }
4255 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
4256 BIO_free(bio);
4257 #ifndef OPENSSL_NO_DSA
4258 while (dh == NULL) {
4259 DSA *dsa;
4260 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
4261 " trying to parse as DSA params", dh_file,
4262 ERR_error_string(ERR_get_error(), NULL));
4263 bio = BIO_new_file(dh_file, "r");
4264 if (bio == NULL)
4265 break;
4266 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
4267 BIO_free(bio);
4268 if (!dsa) {
4269 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
4270 "'%s': %s", dh_file,
4271 ERR_error_string(ERR_get_error(), NULL));
4272 break;
4273 }
4274
4275 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
4276 dh = DSA_dup_DH(dsa);
4277 DSA_free(dsa);
4278 if (dh == NULL) {
4279 wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
4280 "params into DH params");
4281 break;
4282 }
4283 break;
4284 }
4285 #endif /* !OPENSSL_NO_DSA */
4286 if (dh == NULL) {
4287 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
4288 "'%s'", dh_file);
4289 return -1;
4290 }
4291
4292 if (SSL_CTX_set_tmp_dh(ssl_ctx, dh) != 1) {
4293 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
4294 "%s", dh_file,
4295 ERR_error_string(ERR_get_error(), NULL));
4296 DH_free(dh);
4297 return -1;
4298 }
4299 DH_free(dh);
4300 return 0;
4301 #endif /* OpenSSL version >= 3.0 */
4302 #endif /* OPENSSL_NO_DH */
4303 }
4304
4305
tls_connection_get_random(void * ssl_ctx,struct tls_connection * conn,struct tls_random * keys)4306 int tls_connection_get_random(void *ssl_ctx, struct tls_connection *conn,
4307 struct tls_random *keys)
4308 {
4309 SSL *ssl;
4310
4311 if (conn == NULL || keys == NULL)
4312 return -1;
4313 ssl = conn->ssl;
4314 if (ssl == NULL)
4315 return -1;
4316
4317 os_memset(keys, 0, sizeof(*keys));
4318 keys->client_random = conn->client_random;
4319 keys->client_random_len = SSL_get_client_random(
4320 ssl, conn->client_random, sizeof(conn->client_random));
4321 keys->server_random = conn->server_random;
4322 keys->server_random_len = SSL_get_server_random(
4323 ssl, conn->server_random, sizeof(conn->server_random));
4324
4325 return 0;
4326 }
4327
4328
4329 #ifdef OPENSSL_NEED_EAP_FAST_PRF
openssl_get_keyblock_size(SSL * ssl)4330 static int openssl_get_keyblock_size(SSL *ssl)
4331 {
4332 #if OPENSSL_VERSION_NUMBER < 0x10100000L
4333 const EVP_CIPHER *c;
4334 const EVP_MD *h;
4335 int md_size;
4336
4337 if (ssl->enc_read_ctx == NULL || ssl->enc_read_ctx->cipher == NULL ||
4338 ssl->read_hash == NULL)
4339 return -1;
4340
4341 c = ssl->enc_read_ctx->cipher;
4342 h = EVP_MD_CTX_md(ssl->read_hash);
4343 if (h)
4344 md_size = EVP_MD_size(h);
4345 else if (ssl->s3)
4346 md_size = ssl->s3->tmp.new_mac_secret_size;
4347 else
4348 return -1;
4349
4350 wpa_printf(MSG_DEBUG, "OpenSSL: keyblock size: key_len=%d MD_size=%d "
4351 "IV_len=%d", EVP_CIPHER_key_length(c), md_size,
4352 EVP_CIPHER_iv_length(c));
4353 return 2 * (EVP_CIPHER_key_length(c) +
4354 md_size +
4355 EVP_CIPHER_iv_length(c));
4356 #else
4357 const SSL_CIPHER *ssl_cipher;
4358 int cipher, digest;
4359 const EVP_CIPHER *c;
4360 const EVP_MD *h;
4361 int mac_key_len, enc_key_len, fixed_iv_len;
4362
4363 ssl_cipher = SSL_get_current_cipher(ssl);
4364 if (!ssl_cipher)
4365 return -1;
4366 cipher = SSL_CIPHER_get_cipher_nid(ssl_cipher);
4367 digest = SSL_CIPHER_get_digest_nid(ssl_cipher);
4368 wpa_printf(MSG_DEBUG, "OpenSSL: cipher nid %d digest nid %d",
4369 cipher, digest);
4370 if (cipher < 0 || digest < 0)
4371 return -1;
4372 if (cipher == NID_undef) {
4373 wpa_printf(MSG_DEBUG, "OpenSSL: no cipher in use?!");
4374 return -1;
4375 }
4376 c = EVP_get_cipherbynid(cipher);
4377 if (!c)
4378 return -1;
4379 enc_key_len = EVP_CIPHER_key_length(c);
4380 if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE ||
4381 EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE)
4382 fixed_iv_len = 4; /* only part of IV from PRF */
4383 else
4384 fixed_iv_len = EVP_CIPHER_iv_length(c);
4385 if (digest == NID_undef) {
4386 wpa_printf(MSG_DEBUG, "OpenSSL: no digest in use (e.g., AEAD)");
4387 mac_key_len = 0;
4388 } else {
4389 h = EVP_get_digestbynid(digest);
4390 if (!h)
4391 return -1;
4392 mac_key_len = EVP_MD_size(h);
4393 }
4394
4395 wpa_printf(MSG_DEBUG,
4396 "OpenSSL: keyblock size: mac_key_len=%d enc_key_len=%d fixed_iv_len=%d",
4397 mac_key_len, enc_key_len, fixed_iv_len);
4398 return 2 * (mac_key_len + enc_key_len + fixed_iv_len);
4399 #endif
4400 }
4401 #endif /* OPENSSL_NEED_EAP_FAST_PRF */
4402
4403
tls_connection_export_key(void * tls_ctx,struct tls_connection * conn,const char * label,const u8 * context,size_t context_len,u8 * out,size_t out_len)4404 int tls_connection_export_key(void *tls_ctx, struct tls_connection *conn,
4405 const char *label, const u8 *context,
4406 size_t context_len, u8 *out, size_t out_len)
4407 {
4408 if (!conn ||
4409 SSL_export_keying_material(conn->ssl, out, out_len, label,
4410 os_strlen(label), context, context_len,
4411 context != NULL) != 1)
4412 return -1;
4413 return 0;
4414 }
4415
4416
tls_connection_get_eap_fast_key(void * tls_ctx,struct tls_connection * conn,u8 * out,size_t out_len)4417 int tls_connection_get_eap_fast_key(void *tls_ctx, struct tls_connection *conn,
4418 u8 *out, size_t out_len)
4419 {
4420 #ifdef OPENSSL_NEED_EAP_FAST_PRF
4421 SSL *ssl;
4422 SSL_SESSION *sess;
4423 u8 *rnd;
4424 int ret = -1;
4425 int skip = 0;
4426 u8 *tmp_out = NULL;
4427 u8 *_out = out;
4428 unsigned char client_random[SSL3_RANDOM_SIZE];
4429 unsigned char server_random[SSL3_RANDOM_SIZE];
4430 unsigned char master_key[64];
4431 size_t master_key_len;
4432 const char *ver;
4433
4434 /*
4435 * TLS library did not support EAP-FAST key generation, so get the
4436 * needed TLS session parameters and use an internal implementation of
4437 * TLS PRF to derive the key.
4438 */
4439
4440 if (conn == NULL)
4441 return -1;
4442 ssl = conn->ssl;
4443 if (ssl == NULL)
4444 return -1;
4445 ver = SSL_get_version(ssl);
4446 sess = SSL_get_session(ssl);
4447 if (!ver || !sess)
4448 return -1;
4449
4450 skip = openssl_get_keyblock_size(ssl);
4451 if (skip < 0)
4452 return -1;
4453 tmp_out = os_malloc(skip + out_len);
4454 if (!tmp_out)
4455 return -1;
4456 _out = tmp_out;
4457
4458 rnd = os_malloc(2 * SSL3_RANDOM_SIZE);
4459 if (!rnd) {
4460 os_free(tmp_out);
4461 return -1;
4462 }
4463
4464 SSL_get_client_random(ssl, client_random, sizeof(client_random));
4465 SSL_get_server_random(ssl, server_random, sizeof(server_random));
4466 master_key_len = SSL_SESSION_get_master_key(sess, master_key,
4467 sizeof(master_key));
4468
4469 os_memcpy(rnd, server_random, SSL3_RANDOM_SIZE);
4470 os_memcpy(rnd + SSL3_RANDOM_SIZE, client_random, SSL3_RANDOM_SIZE);
4471
4472 if (os_strcmp(ver, "TLSv1.2") == 0) {
4473 tls_prf_sha256(master_key, master_key_len,
4474 "key expansion", rnd, 2 * SSL3_RANDOM_SIZE,
4475 _out, skip + out_len);
4476 ret = 0;
4477 } else if (tls_prf_sha1_md5(master_key, master_key_len,
4478 "key expansion", rnd, 2 * SSL3_RANDOM_SIZE,
4479 _out, skip + out_len) == 0) {
4480 ret = 0;
4481 }
4482 forced_memzero(master_key, sizeof(master_key));
4483 os_free(rnd);
4484 if (ret == 0)
4485 os_memcpy(out, _out + skip, out_len);
4486 bin_clear_free(tmp_out, skip);
4487
4488 return ret;
4489 #else /* OPENSSL_NEED_EAP_FAST_PRF */
4490 wpa_printf(MSG_ERROR,
4491 "OpenSSL: EAP-FAST keys cannot be exported in FIPS mode");
4492 return -1;
4493 #endif /* OPENSSL_NEED_EAP_FAST_PRF */
4494 }
4495
4496
4497 static struct wpabuf *
openssl_handshake(struct tls_connection * conn,const struct wpabuf * in_data)4498 openssl_handshake(struct tls_connection *conn, const struct wpabuf *in_data)
4499 {
4500 struct tls_context *context = conn->context;
4501 int res;
4502 struct wpabuf *out_data;
4503
4504 /*
4505 * Give TLS handshake data from the server (if available) to OpenSSL
4506 * for processing.
4507 */
4508 if (in_data && wpabuf_len(in_data) > 0 &&
4509 BIO_write(conn->ssl_in, wpabuf_head(in_data), wpabuf_len(in_data))
4510 < 0) {
4511 tls_show_errors(MSG_INFO, __func__,
4512 "Handshake failed - BIO_write");
4513 return NULL;
4514 }
4515
4516 /* Initiate TLS handshake or continue the existing handshake */
4517 if (conn->server)
4518 res = SSL_accept(conn->ssl);
4519 else
4520 res = SSL_connect(conn->ssl);
4521 if (res != 1) {
4522 int err = SSL_get_error(conn->ssl, res);
4523 if (err == SSL_ERROR_WANT_READ)
4524 wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want "
4525 "more data");
4526 else if (err == SSL_ERROR_WANT_WRITE)
4527 wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want to "
4528 "write");
4529 else {
4530 unsigned long error = ERR_peek_last_error();
4531
4532 tls_show_errors(MSG_INFO, __func__, "SSL_connect");
4533
4534 if (context->event_cb &&
4535 ERR_GET_LIB(error) == ERR_LIB_SSL &&
4536 ERR_GET_REASON(error) ==
4537 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED) {
4538 context->event_cb(
4539 context->cb_ctx,
4540 TLS_UNSAFE_RENEGOTIATION_DISABLED,
4541 NULL);
4542 }
4543 conn->failed++;
4544 if (!conn->server && !conn->client_hello_generated) {
4545 /* The server would not understand TLS Alert
4546 * before ClientHello, so simply terminate
4547 * handshake on this type of error case caused
4548 * by a likely internal error like no ciphers
4549 * available. */
4550 wpa_printf(MSG_DEBUG,
4551 "OpenSSL: Could not generate ClientHello");
4552 conn->write_alerts++;
4553 return NULL;
4554 }
4555 }
4556 }
4557
4558 if (!conn->server && !conn->failed)
4559 conn->client_hello_generated = 1;
4560
4561 #ifdef CONFIG_SUITEB
4562 if ((conn->flags & TLS_CONN_SUITEB) && !conn->server &&
4563 os_strncmp(SSL_get_cipher(conn->ssl), "DHE-", 4) == 0 &&
4564 conn->server_dh_prime_len < 3072) {
4565 /*
4566 * This should not be reached since earlier cert_cb should have
4567 * terminated the handshake. Keep this check here for extra
4568 * protection if anything goes wrong with the more low-level
4569 * checks based on having to parse the TLS handshake messages.
4570 */
4571 wpa_printf(MSG_DEBUG,
4572 "OpenSSL: Server DH prime length: %d bits",
4573 conn->server_dh_prime_len);
4574
4575 if (context->event_cb) {
4576 union tls_event_data ev;
4577
4578 os_memset(&ev, 0, sizeof(ev));
4579 ev.alert.is_local = 1;
4580 ev.alert.type = "fatal";
4581 ev.alert.description = "insufficient security";
4582 context->event_cb(context->cb_ctx, TLS_ALERT, &ev);
4583 }
4584 /*
4585 * Could send a TLS Alert to the server, but for now, simply
4586 * terminate handshake.
4587 */
4588 conn->failed++;
4589 conn->write_alerts++;
4590 return NULL;
4591 }
4592 #endif /* CONFIG_SUITEB */
4593
4594 /* Get the TLS handshake data to be sent to the server */
4595 res = BIO_ctrl_pending(conn->ssl_out);
4596 wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
4597 out_data = wpabuf_alloc(res);
4598 if (out_data == NULL) {
4599 wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
4600 "handshake output (%d bytes)", res);
4601 if (BIO_reset(conn->ssl_out) < 0) {
4602 tls_show_errors(MSG_INFO, __func__,
4603 "BIO_reset failed");
4604 }
4605 return NULL;
4606 }
4607 res = res == 0 ? 0 : BIO_read(conn->ssl_out, wpabuf_mhead(out_data),
4608 res);
4609 if (res < 0) {
4610 tls_show_errors(MSG_INFO, __func__,
4611 "Handshake failed - BIO_read");
4612 if (BIO_reset(conn->ssl_out) < 0) {
4613 tls_show_errors(MSG_INFO, __func__,
4614 "BIO_reset failed");
4615 }
4616 wpabuf_free(out_data);
4617 return NULL;
4618 }
4619 wpabuf_put(out_data, res);
4620
4621 return out_data;
4622 }
4623
4624
4625 static struct wpabuf *
openssl_get_appl_data(struct tls_connection * conn,size_t max_len)4626 openssl_get_appl_data(struct tls_connection *conn, size_t max_len)
4627 {
4628 struct wpabuf *appl_data;
4629 int res;
4630
4631 appl_data = wpabuf_alloc(max_len + 100);
4632 if (appl_data == NULL)
4633 return NULL;
4634
4635 res = SSL_read(conn->ssl, wpabuf_mhead(appl_data),
4636 wpabuf_size(appl_data));
4637 if (res < 0) {
4638 int err = SSL_get_error(conn->ssl, res);
4639 if (err == SSL_ERROR_WANT_READ ||
4640 err == SSL_ERROR_WANT_WRITE) {
4641 wpa_printf(MSG_DEBUG, "SSL: No Application Data "
4642 "included");
4643 } else {
4644 tls_show_errors(MSG_INFO, __func__,
4645 "Failed to read possible "
4646 "Application Data");
4647 }
4648 wpabuf_free(appl_data);
4649 return NULL;
4650 }
4651
4652 wpabuf_put(appl_data, res);
4653 wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application Data in Finished "
4654 "message", appl_data);
4655
4656 return appl_data;
4657 }
4658
4659
4660 static struct wpabuf *
openssl_connection_handshake(struct tls_connection * conn,const struct wpabuf * in_data,struct wpabuf ** appl_data)4661 openssl_connection_handshake(struct tls_connection *conn,
4662 const struct wpabuf *in_data,
4663 struct wpabuf **appl_data)
4664 {
4665 struct wpabuf *out_data;
4666
4667 if (appl_data)
4668 *appl_data = NULL;
4669
4670 out_data = openssl_handshake(conn, in_data);
4671 if (out_data == NULL)
4672 return NULL;
4673 if (conn->invalid_hb_used) {
4674 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
4675 wpabuf_free(out_data);
4676 return NULL;
4677 }
4678
4679 if (SSL_is_init_finished(conn->ssl)) {
4680 wpa_printf(MSG_DEBUG,
4681 "OpenSSL: Handshake finished - resumed=%d",
4682 tls_connection_resumed(conn->ssl_ctx, conn));
4683 if (conn->server) {
4684 char *buf;
4685 size_t buflen = 2000;
4686
4687 buf = os_malloc(buflen);
4688 if (buf) {
4689 if (SSL_get_shared_ciphers(conn->ssl, buf,
4690 buflen)) {
4691 buf[buflen - 1] = '\0';
4692 wpa_printf(MSG_DEBUG,
4693 "OpenSSL: Shared ciphers: %s",
4694 buf);
4695 }
4696 os_free(buf);
4697 }
4698 }
4699 if (appl_data && in_data)
4700 *appl_data = openssl_get_appl_data(conn,
4701 wpabuf_len(in_data));
4702 }
4703
4704 if (conn->invalid_hb_used) {
4705 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
4706 if (appl_data) {
4707 wpabuf_free(*appl_data);
4708 *appl_data = NULL;
4709 }
4710 wpabuf_free(out_data);
4711 return NULL;
4712 }
4713
4714 return out_data;
4715 }
4716
4717
4718 struct wpabuf *
tls_connection_handshake(void * ssl_ctx,struct tls_connection * conn,const struct wpabuf * in_data,struct wpabuf ** appl_data)4719 tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
4720 const struct wpabuf *in_data,
4721 struct wpabuf **appl_data)
4722 {
4723 return openssl_connection_handshake(conn, in_data, appl_data);
4724 }
4725
4726
tls_connection_server_handshake(void * tls_ctx,struct tls_connection * conn,const struct wpabuf * in_data,struct wpabuf ** appl_data)4727 struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
4728 struct tls_connection *conn,
4729 const struct wpabuf *in_data,
4730 struct wpabuf **appl_data)
4731 {
4732 conn->server = 1;
4733 return openssl_connection_handshake(conn, in_data, appl_data);
4734 }
4735
4736
tls_connection_encrypt(void * tls_ctx,struct tls_connection * conn,const struct wpabuf * in_data)4737 struct wpabuf * tls_connection_encrypt(void *tls_ctx,
4738 struct tls_connection *conn,
4739 const struct wpabuf *in_data)
4740 {
4741 int res;
4742 struct wpabuf *buf;
4743
4744 if (conn == NULL)
4745 return NULL;
4746
4747 /* Give plaintext data for OpenSSL to encrypt into the TLS tunnel. */
4748 if ((res = BIO_reset(conn->ssl_in)) < 0 ||
4749 (res = BIO_reset(conn->ssl_out)) < 0) {
4750 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
4751 return NULL;
4752 }
4753 res = SSL_write(conn->ssl, wpabuf_head(in_data), wpabuf_len(in_data));
4754 if (res < 0) {
4755 tls_show_errors(MSG_INFO, __func__,
4756 "Encryption failed - SSL_write");
4757 return NULL;
4758 }
4759
4760 /* Read encrypted data to be sent to the server */
4761 buf = wpabuf_alloc(wpabuf_len(in_data) + 300);
4762 if (buf == NULL)
4763 return NULL;
4764 res = BIO_read(conn->ssl_out, wpabuf_mhead(buf), wpabuf_size(buf));
4765 if (res < 0) {
4766 tls_show_errors(MSG_INFO, __func__,
4767 "Encryption failed - BIO_read");
4768 wpabuf_free(buf);
4769 return NULL;
4770 }
4771 wpabuf_put(buf, res);
4772
4773 return buf;
4774 }
4775
4776
tls_connection_decrypt(void * tls_ctx,struct tls_connection * conn,const struct wpabuf * in_data)4777 struct wpabuf * tls_connection_decrypt(void *tls_ctx,
4778 struct tls_connection *conn,
4779 const struct wpabuf *in_data)
4780 {
4781 int res;
4782 struct wpabuf *buf;
4783
4784 /* Give encrypted data from TLS tunnel for OpenSSL to decrypt. */
4785 res = BIO_write(conn->ssl_in, wpabuf_head(in_data),
4786 wpabuf_len(in_data));
4787 if (res < 0) {
4788 tls_show_errors(MSG_INFO, __func__,
4789 "Decryption failed - BIO_write");
4790 return NULL;
4791 }
4792 if (BIO_reset(conn->ssl_out) < 0) {
4793 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
4794 return NULL;
4795 }
4796
4797 /* Read decrypted data for further processing */
4798 /*
4799 * Even though we try to disable TLS compression, it is possible that
4800 * this cannot be done with all TLS libraries. Add extra buffer space
4801 * to handle the possibility of the decrypted data being longer than
4802 * input data.
4803 */
4804 buf = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
4805 if (buf == NULL)
4806 return NULL;
4807 res = SSL_read(conn->ssl, wpabuf_mhead(buf), wpabuf_size(buf));
4808 if (res < 0) {
4809 int err = SSL_get_error(conn->ssl, res);
4810
4811 if (err == SSL_ERROR_WANT_READ) {
4812 wpa_printf(MSG_DEBUG,
4813 "SSL: SSL_connect - want more data");
4814 res = 0;
4815 } else {
4816 tls_show_errors(MSG_INFO, __func__,
4817 "Decryption failed - SSL_read");
4818 wpabuf_free(buf);
4819 return NULL;
4820 }
4821 }
4822 wpabuf_put(buf, res);
4823
4824 if (conn->invalid_hb_used) {
4825 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
4826 wpabuf_free(buf);
4827 return NULL;
4828 }
4829
4830 return buf;
4831 }
4832
4833
tls_connection_resumed(void * ssl_ctx,struct tls_connection * conn)4834 int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn)
4835 {
4836 return conn ? SSL_session_reused(conn->ssl) : 0;
4837 }
4838
4839
tls_connection_set_cipher_list(void * tls_ctx,struct tls_connection * conn,u8 * ciphers)4840 int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
4841 u8 *ciphers)
4842 {
4843 char buf[500], *pos, *end;
4844 u8 *c;
4845 int ret;
4846
4847 if (conn == NULL || conn->ssl == NULL || ciphers == NULL)
4848 return -1;
4849
4850 buf[0] = '\0';
4851 pos = buf;
4852 end = pos + sizeof(buf);
4853
4854 c = ciphers;
4855 while (*c != TLS_CIPHER_NONE) {
4856 const char *suite;
4857
4858 switch (*c) {
4859 case TLS_CIPHER_RC4_SHA:
4860 suite = "RC4-SHA";
4861 break;
4862 case TLS_CIPHER_AES128_SHA:
4863 suite = "AES128-SHA";
4864 break;
4865 case TLS_CIPHER_RSA_DHE_AES128_SHA:
4866 suite = "DHE-RSA-AES128-SHA";
4867 break;
4868 case TLS_CIPHER_ANON_DH_AES128_SHA:
4869 suite = "ADH-AES128-SHA";
4870 break;
4871 case TLS_CIPHER_RSA_DHE_AES256_SHA:
4872 suite = "DHE-RSA-AES256-SHA";
4873 break;
4874 case TLS_CIPHER_AES256_SHA:
4875 suite = "AES256-SHA";
4876 break;
4877 default:
4878 wpa_printf(MSG_DEBUG, "TLS: Unsupported "
4879 "cipher selection: %d", *c);
4880 return -1;
4881 }
4882 ret = os_snprintf(pos, end - pos, ":%s", suite);
4883 if (os_snprintf_error(end - pos, ret))
4884 break;
4885 pos += ret;
4886
4887 c++;
4888 }
4889 if (!buf[0]) {
4890 wpa_printf(MSG_DEBUG, "OpenSSL: No ciphers listed");
4891 return -1;
4892 }
4893
4894 wpa_printf(MSG_DEBUG, "OpenSSL: cipher suites: %s", buf + 1);
4895
4896 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
4897 #ifdef EAP_FAST_OR_TEAP
4898 if (os_strstr(buf, ":ADH-")) {
4899 /*
4900 * Need to drop to security level 0 to allow anonymous
4901 * cipher suites for EAP-FAST.
4902 */
4903 SSL_set_security_level(conn->ssl, 0);
4904 } else if (SSL_get_security_level(conn->ssl) == 0) {
4905 /* Force at least security level 1 */
4906 SSL_set_security_level(conn->ssl, 1);
4907 }
4908 #endif /* EAP_FAST_OR_TEAP */
4909 #endif
4910
4911 if (SSL_set_cipher_list(conn->ssl, buf + 1) != 1) {
4912 tls_show_errors(MSG_INFO, __func__,
4913 "Cipher suite configuration failed");
4914 return -1;
4915 }
4916
4917 return 0;
4918 }
4919
4920
tls_get_version(void * ssl_ctx,struct tls_connection * conn,char * buf,size_t buflen)4921 int tls_get_version(void *ssl_ctx, struct tls_connection *conn,
4922 char *buf, size_t buflen)
4923 {
4924 const char *name;
4925 if (conn == NULL || conn->ssl == NULL)
4926 return -1;
4927
4928 name = SSL_get_version(conn->ssl);
4929 if (name == NULL)
4930 return -1;
4931
4932 os_strlcpy(buf, name, buflen);
4933 return 0;
4934 }
4935
4936
tls_get_cipher(void * ssl_ctx,struct tls_connection * conn,char * buf,size_t buflen)4937 int tls_get_cipher(void *ssl_ctx, struct tls_connection *conn,
4938 char *buf, size_t buflen)
4939 {
4940 const char *name;
4941 if (conn == NULL || conn->ssl == NULL)
4942 return -1;
4943
4944 name = SSL_get_cipher(conn->ssl);
4945 if (name == NULL)
4946 return -1;
4947
4948 os_strlcpy(buf, name, buflen);
4949 return 0;
4950 }
4951
4952
tls_connection_enable_workaround(void * ssl_ctx,struct tls_connection * conn)4953 int tls_connection_enable_workaround(void *ssl_ctx,
4954 struct tls_connection *conn)
4955 {
4956 SSL_set_options(conn->ssl, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);
4957
4958 return 0;
4959 }
4960
4961
4962 #ifdef EAP_FAST_OR_TEAP
4963 /* ClientHello TLS extensions require a patch to openssl, so this function is
4964 * commented out unless explicitly needed for EAP-FAST in order to be able to
4965 * build this file with unmodified openssl. */
tls_connection_client_hello_ext(void * ssl_ctx,struct tls_connection * conn,int ext_type,const u8 * data,size_t data_len)4966 int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn,
4967 int ext_type, const u8 *data,
4968 size_t data_len)
4969 {
4970 if (conn == NULL || conn->ssl == NULL || ext_type != 35)
4971 return -1;
4972
4973 if (SSL_set_session_ticket_ext(conn->ssl, (void *) data,
4974 data_len) != 1)
4975 return -1;
4976
4977 return 0;
4978 }
4979 #endif /* EAP_FAST_OR_TEAP */
4980
4981
tls_connection_get_failed(void * ssl_ctx,struct tls_connection * conn)4982 int tls_connection_get_failed(void *ssl_ctx, struct tls_connection *conn)
4983 {
4984 if (conn == NULL)
4985 return -1;
4986 return conn->failed;
4987 }
4988
4989
tls_connection_get_read_alerts(void * ssl_ctx,struct tls_connection * conn)4990 int tls_connection_get_read_alerts(void *ssl_ctx, struct tls_connection *conn)
4991 {
4992 if (conn == NULL)
4993 return -1;
4994 return conn->read_alerts;
4995 }
4996
4997
tls_connection_get_write_alerts(void * ssl_ctx,struct tls_connection * conn)4998 int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn)
4999 {
5000 if (conn == NULL)
5001 return -1;
5002 return conn->write_alerts;
5003 }
5004
5005
5006 #ifdef HAVE_OCSP
5007
ocsp_debug_print_resp(OCSP_RESPONSE * rsp)5008 static void ocsp_debug_print_resp(OCSP_RESPONSE *rsp)
5009 {
5010 #ifndef CONFIG_NO_STDOUT_DEBUG
5011 BIO *out;
5012 size_t rlen;
5013 char *txt;
5014 int res;
5015
5016 if (wpa_debug_level > MSG_DEBUG)
5017 return;
5018
5019 out = BIO_new(BIO_s_mem());
5020 if (!out)
5021 return;
5022
5023 OCSP_RESPONSE_print(out, rsp, 0);
5024 rlen = BIO_ctrl_pending(out);
5025 txt = os_malloc(rlen + 1);
5026 if (!txt) {
5027 BIO_free(out);
5028 return;
5029 }
5030
5031 res = BIO_read(out, txt, rlen);
5032 if (res > 0) {
5033 txt[res] = '\0';
5034 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP Response\n%s", txt);
5035 }
5036 os_free(txt);
5037 BIO_free(out);
5038 #endif /* CONFIG_NO_STDOUT_DEBUG */
5039 }
5040
5041
ocsp_resp_cb(SSL * s,void * arg)5042 static int ocsp_resp_cb(SSL *s, void *arg)
5043 {
5044 struct tls_connection *conn = arg;
5045 const unsigned char *p;
5046 int len, status, reason, res;
5047 OCSP_RESPONSE *rsp;
5048 OCSP_BASICRESP *basic;
5049 OCSP_CERTID *id;
5050 ASN1_GENERALIZEDTIME *produced_at, *this_update, *next_update;
5051 X509_STORE *store;
5052 STACK_OF(X509) *certs = NULL;
5053
5054 len = SSL_get_tlsext_status_ocsp_resp(s, &p);
5055 if (!p) {
5056 #if OPENSSL_VERSION_NUMBER >= 0x10101000L
5057 #if !defined(LIBRESSL_VERSION_NUMBER) || LIBRESSL_VERSION_NUMBER >= 0x30400000L
5058 if (SSL_version(s) == TLS1_3_VERSION && SSL_session_reused(s)) {
5059 /* TLS 1.3 sends the OCSP response with the server
5060 * Certificate message. Since that Certificate message
5061 * is not sent when resuming a session, there can be no
5062 * new OCSP response. Allow this since the OCSP response
5063 * was validated when checking the initial certificate
5064 * exchange. */
5065 wpa_printf(MSG_DEBUG,
5066 "OpenSSL: Allow no OCSP response when using TLS 1.3 and a resumed session");
5067 return 1;
5068 }
5069 #endif
5070 #endif
5071 wpa_printf(MSG_DEBUG, "OpenSSL: No OCSP response received");
5072 return (conn->flags & TLS_CONN_REQUIRE_OCSP) ? 0 : 1;
5073 }
5074
5075 wpa_hexdump(MSG_DEBUG, "OpenSSL: OCSP response", p, len);
5076
5077 rsp = d2i_OCSP_RESPONSE(NULL, &p, len);
5078 if (!rsp) {
5079 wpa_printf(MSG_INFO, "OpenSSL: Failed to parse OCSP response");
5080 return 0;
5081 }
5082
5083 ocsp_debug_print_resp(rsp);
5084
5085 status = OCSP_response_status(rsp);
5086 if (status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
5087 wpa_printf(MSG_INFO, "OpenSSL: OCSP responder error %d (%s)",
5088 status, OCSP_response_status_str(status));
5089 return 0;
5090 }
5091
5092 basic = OCSP_response_get1_basic(rsp);
5093 if (!basic) {
5094 wpa_printf(MSG_INFO, "OpenSSL: Could not find BasicOCSPResponse");
5095 return 0;
5096 }
5097
5098 store = SSL_CTX_get_cert_store(conn->ssl_ctx);
5099 if (conn->peer_issuer) {
5100 debug_print_cert(conn->peer_issuer, "Add OCSP issuer");
5101
5102 if (X509_STORE_add_cert(store, conn->peer_issuer) != 1) {
5103 tls_show_errors(MSG_INFO, __func__,
5104 "OpenSSL: Could not add issuer to certificate store");
5105 }
5106 certs = sk_X509_new_null();
5107 if (certs) {
5108 X509 *cert;
5109 cert = X509_dup(conn->peer_issuer);
5110 if (cert && !sk_X509_push(certs, cert)) {
5111 tls_show_errors(
5112 MSG_INFO, __func__,
5113 "OpenSSL: Could not add issuer to OCSP responder trust store");
5114 X509_free(cert);
5115 sk_X509_free(certs);
5116 certs = NULL;
5117 }
5118 if (certs && conn->peer_issuer_issuer) {
5119 cert = X509_dup(conn->peer_issuer_issuer);
5120 if (cert && !sk_X509_push(certs, cert)) {
5121 tls_show_errors(
5122 MSG_INFO, __func__,
5123 "OpenSSL: Could not add issuer's issuer to OCSP responder trust store");
5124 X509_free(cert);
5125 }
5126 }
5127 }
5128 }
5129
5130 status = OCSP_basic_verify(basic, certs, store, OCSP_TRUSTOTHER);
5131 sk_X509_pop_free(certs, X509_free);
5132 if (status <= 0) {
5133 tls_show_errors(MSG_INFO, __func__,
5134 "OpenSSL: OCSP response failed verification");
5135 OCSP_BASICRESP_free(basic);
5136 OCSP_RESPONSE_free(rsp);
5137 return 0;
5138 }
5139
5140 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP response verification succeeded");
5141
5142 if (!conn->peer_cert) {
5143 wpa_printf(MSG_DEBUG, "OpenSSL: Peer certificate not available for OCSP status check");
5144 OCSP_BASICRESP_free(basic);
5145 OCSP_RESPONSE_free(rsp);
5146 return 0;
5147 }
5148
5149 if (!conn->peer_issuer) {
5150 wpa_printf(MSG_DEBUG, "OpenSSL: Peer issuer certificate not available for OCSP status check");
5151 OCSP_BASICRESP_free(basic);
5152 OCSP_RESPONSE_free(rsp);
5153 return 0;
5154 }
5155
5156 id = OCSP_cert_to_id(EVP_sha256(), conn->peer_cert, conn->peer_issuer);
5157 if (!id) {
5158 wpa_printf(MSG_DEBUG,
5159 "OpenSSL: Could not create OCSP certificate identifier (SHA256)");
5160 OCSP_BASICRESP_free(basic);
5161 OCSP_RESPONSE_free(rsp);
5162 return 0;
5163 }
5164
5165 res = OCSP_resp_find_status(basic, id, &status, &reason, &produced_at,
5166 &this_update, &next_update);
5167 if (!res) {
5168 OCSP_CERTID_free(id);
5169 id = OCSP_cert_to_id(NULL, conn->peer_cert, conn->peer_issuer);
5170 if (!id) {
5171 wpa_printf(MSG_DEBUG,
5172 "OpenSSL: Could not create OCSP certificate identifier (SHA1)");
5173 OCSP_BASICRESP_free(basic);
5174 OCSP_RESPONSE_free(rsp);
5175 return 0;
5176 }
5177
5178 res = OCSP_resp_find_status(basic, id, &status, &reason,
5179 &produced_at, &this_update,
5180 &next_update);
5181 }
5182
5183 if (!res) {
5184 wpa_printf(MSG_INFO, "OpenSSL: Could not find current server certificate from OCSP response%s",
5185 (conn->flags & TLS_CONN_REQUIRE_OCSP) ? "" :
5186 " (OCSP not required)");
5187 OCSP_CERTID_free(id);
5188 OCSP_BASICRESP_free(basic);
5189 OCSP_RESPONSE_free(rsp);
5190 return (conn->flags & TLS_CONN_REQUIRE_OCSP) ? 0 : 1;
5191 }
5192 OCSP_CERTID_free(id);
5193
5194 if (!OCSP_check_validity(this_update, next_update, 5 * 60, -1)) {
5195 tls_show_errors(MSG_INFO, __func__,
5196 "OpenSSL: OCSP status times invalid");
5197 OCSP_BASICRESP_free(basic);
5198 OCSP_RESPONSE_free(rsp);
5199 return 0;
5200 }
5201
5202 OCSP_BASICRESP_free(basic);
5203 OCSP_RESPONSE_free(rsp);
5204
5205 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status for server certificate: %s",
5206 OCSP_cert_status_str(status));
5207
5208 if (status == V_OCSP_CERTSTATUS_GOOD)
5209 return 1;
5210 if (status == V_OCSP_CERTSTATUS_REVOKED)
5211 return 0;
5212 if (conn->flags & TLS_CONN_REQUIRE_OCSP) {
5213 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status unknown, but OCSP required");
5214 return 0;
5215 }
5216 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status unknown, but OCSP was not required, so allow connection to continue");
5217 return 1;
5218 }
5219
5220
ocsp_status_cb(SSL * s,void * arg)5221 static int ocsp_status_cb(SSL *s, void *arg)
5222 {
5223 char *tmp;
5224 char *resp;
5225 size_t len;
5226
5227 if (tls_global->ocsp_stapling_response == NULL) {
5228 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - no response configured");
5229 return SSL_TLSEXT_ERR_OK;
5230 }
5231
5232 resp = os_readfile(tls_global->ocsp_stapling_response, &len);
5233 if (resp == NULL) {
5234 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - could not read response file");
5235 /* TODO: Build OCSPResponse with responseStatus = internalError
5236 */
5237 return SSL_TLSEXT_ERR_OK;
5238 }
5239 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - send cached response");
5240 tmp = OPENSSL_malloc(len);
5241 if (tmp == NULL) {
5242 os_free(resp);
5243 return SSL_TLSEXT_ERR_ALERT_FATAL;
5244 }
5245
5246 os_memcpy(tmp, resp, len);
5247 os_free(resp);
5248 SSL_set_tlsext_status_ocsp_resp(s, tmp, len);
5249
5250 return SSL_TLSEXT_ERR_OK;
5251 }
5252
5253 #endif /* HAVE_OCSP */
5254
5255
max_str_len(const char ** lines)5256 static size_t max_str_len(const char **lines)
5257 {
5258 const char **p;
5259 size_t max_len = 0;
5260
5261 for (p = lines; *p; p++) {
5262 size_t len = os_strlen(*p);
5263
5264 if (len > max_len)
5265 max_len = len;
5266 }
5267
5268 return max_len;
5269 }
5270
5271
match_lines_in_file(const char * path,const char ** lines)5272 static int match_lines_in_file(const char *path, const char **lines)
5273 {
5274 FILE *f;
5275 char *buf;
5276 size_t bufsize;
5277 int found = 0, is_linestart = 1;
5278
5279 bufsize = max_str_len(lines) + sizeof("\r\n");
5280 buf = os_malloc(bufsize);
5281 if (!buf)
5282 return 0;
5283
5284 f = fopen(path, "r");
5285 if (!f) {
5286 os_free(buf);
5287 return 0;
5288 }
5289
5290 while (!found && fgets(buf, bufsize, f)) {
5291 int is_lineend;
5292 size_t len;
5293 const char **p;
5294
5295 len = strcspn(buf, "\r\n");
5296 is_lineend = buf[len] != '\0';
5297 buf[len] = '\0';
5298
5299 if (is_linestart && is_lineend) {
5300 for (p = lines; !found && *p; p++)
5301 found = os_strcmp(buf, *p) == 0;
5302 }
5303 is_linestart = is_lineend;
5304 }
5305
5306 fclose(f);
5307 bin_clear_free(buf, bufsize);
5308
5309 return found;
5310 }
5311
5312
is_tpm2_key(const char * path)5313 static int is_tpm2_key(const char *path)
5314 {
5315 /* Check both new and old format of TPM2 PEM guard tag */
5316 static const char *tpm2_tags[] = {
5317 "-----BEGIN TSS2 PRIVATE KEY-----",
5318 "-----BEGIN TSS2 KEY BLOB-----",
5319 NULL
5320 };
5321
5322 return match_lines_in_file(path, tpm2_tags);
5323 }
5324
5325
tls_connection_set_params(void * tls_ctx,struct tls_connection * conn,const struct tls_connection_params * params)5326 int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
5327 const struct tls_connection_params *params)
5328 {
5329 struct tls_data *data = tls_ctx;
5330 int ret;
5331 unsigned long err;
5332 int can_pkcs11 = 0;
5333 const char *key_id = params->key_id;
5334 const char *cert_id = params->cert_id;
5335 const char *ca_cert_id = params->ca_cert_id;
5336 const char *engine_id = params->engine ? params->engine_id : NULL;
5337 const char *ciphers;
5338
5339 if (conn == NULL)
5340 return -1;
5341
5342 if (params->flags & TLS_CONN_REQUIRE_OCSP_ALL) {
5343 wpa_printf(MSG_INFO,
5344 "OpenSSL: ocsp=3 not supported");
5345 return -1;
5346 }
5347
5348 /*
5349 * If the engine isn't explicitly configured, and any of the
5350 * cert/key fields are actually PKCS#11 URIs, then automatically
5351 * use the PKCS#11 ENGINE.
5352 */
5353 if (!engine_id || os_strcmp(engine_id, "pkcs11") == 0)
5354 can_pkcs11 = 1;
5355
5356 if (!key_id && params->private_key && can_pkcs11 &&
5357 os_strncmp(params->private_key, "pkcs11:", 7) == 0) {
5358 can_pkcs11 = 2;
5359 key_id = params->private_key;
5360 }
5361
5362 if (!cert_id && params->client_cert && can_pkcs11 &&
5363 os_strncmp(params->client_cert, "pkcs11:", 7) == 0) {
5364 can_pkcs11 = 2;
5365 cert_id = params->client_cert;
5366 }
5367
5368 if (!ca_cert_id && params->ca_cert && can_pkcs11 &&
5369 os_strncmp(params->ca_cert, "pkcs11:", 7) == 0) {
5370 can_pkcs11 = 2;
5371 ca_cert_id = params->ca_cert;
5372 }
5373
5374 /* If we need to automatically enable the PKCS#11 ENGINE, do so. */
5375 if (can_pkcs11 == 2 && !engine_id)
5376 engine_id = "pkcs11";
5377
5378 /* If private_key points to a TPM2-wrapped key, automatically enable
5379 * tpm2 engine and use it to unwrap the key. */
5380 if (params->private_key &&
5381 (!engine_id || os_strcmp(engine_id, "tpm2") == 0) &&
5382 is_tpm2_key(params->private_key)) {
5383 wpa_printf(MSG_DEBUG, "OpenSSL: Found TPM2 wrapped key %s",
5384 params->private_key);
5385 key_id = key_id ? key_id : params->private_key;
5386 engine_id = engine_id ? engine_id : "tpm2";
5387 }
5388
5389 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
5390 #if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
5391 if (params->flags & TLS_CONN_EAP_FAST) {
5392 wpa_printf(MSG_DEBUG,
5393 "OpenSSL: Use TLSv1_method() for EAP-FAST");
5394 if (SSL_set_ssl_method(conn->ssl, TLSv1_method()) != 1) {
5395 tls_show_errors(MSG_INFO, __func__,
5396 "Failed to set TLSv1_method() for EAP-FAST");
5397 return -1;
5398 }
5399 }
5400 #endif
5401 #if OPENSSL_VERSION_NUMBER >= 0x10101000L
5402 #ifdef SSL_OP_NO_TLSv1_3
5403 if (params->flags & TLS_CONN_EAP_FAST) {
5404 /* Need to disable TLS v1.3 at least for now since OpenSSL 1.1.1
5405 * refuses to start the handshake with the modified ciphersuite
5406 * list (no TLS v1.3 ciphersuites included) for EAP-FAST. */
5407 wpa_printf(MSG_DEBUG, "OpenSSL: Disable TLSv1.3 for EAP-FAST");
5408 SSL_set_options(conn->ssl, SSL_OP_NO_TLSv1_3);
5409 }
5410 #endif /* SSL_OP_NO_TLSv1_3 */
5411 #endif
5412 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
5413
5414 while ((err = ERR_get_error())) {
5415 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
5416 __func__, ERR_error_string(err, NULL));
5417 }
5418
5419 if (tls_set_conn_flags(conn, params->flags,
5420 params->openssl_ciphers) < 0)
5421 return -1;
5422
5423 if (engine_id) {
5424 wpa_printf(MSG_DEBUG, "SSL: Initializing TLS engine %s",
5425 engine_id);
5426 ret = tls_engine_init(conn, engine_id, params->pin,
5427 key_id, cert_id, ca_cert_id);
5428 if (ret)
5429 return ret;
5430 }
5431 if (tls_connection_set_subject_match(conn,
5432 params->subject_match,
5433 params->altsubject_match,
5434 params->suffix_match,
5435 params->domain_match,
5436 params->check_cert_subject))
5437 return -1;
5438
5439 if (engine_id && ca_cert_id) {
5440 if (tls_connection_engine_ca_cert(data, conn, ca_cert_id))
5441 return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
5442 } else if (tls_connection_ca_cert(data, conn, params->ca_cert,
5443 params->ca_cert_blob,
5444 params->ca_cert_blob_len,
5445 params->ca_path))
5446 return -1;
5447
5448 if (engine_id && cert_id) {
5449 if (tls_connection_engine_client_cert(conn, cert_id))
5450 return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
5451 } else if (tls_connection_client_cert(conn, params->client_cert,
5452 params->client_cert_blob,
5453 params->client_cert_blob_len))
5454 return -1;
5455
5456 if (engine_id && key_id) {
5457 wpa_printf(MSG_DEBUG, "TLS: Using private key from engine");
5458 if (tls_connection_engine_private_key(conn))
5459 return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
5460 } else if (tls_connection_private_key(data, conn,
5461 params->private_key,
5462 params->private_key_passwd,
5463 params->private_key_blob,
5464 params->private_key_blob_len)) {
5465 wpa_printf(MSG_INFO, "TLS: Failed to load private key '%s'",
5466 params->private_key);
5467 return -1;
5468 }
5469
5470 ciphers = params->openssl_ciphers;
5471 #ifdef CONFIG_SUITEB
5472 #ifdef OPENSSL_IS_BORINGSSL
5473 if (ciphers && os_strcmp(ciphers, "SUITEB192") == 0) {
5474 /* BoringSSL removed support for SUITEB192, so need to handle
5475 * this with hardcoded ciphersuite and additional checks for
5476 * other parameters. */
5477 ciphers = "ECDHE-ECDSA-AES256-GCM-SHA384";
5478 }
5479 #endif /* OPENSSL_IS_BORINGSSL */
5480 #endif /* CONFIG_SUITEB */
5481 if (ciphers && SSL_set_cipher_list(conn->ssl, ciphers) != 1) {
5482 wpa_printf(MSG_INFO,
5483 "OpenSSL: Failed to set cipher string '%s'",
5484 ciphers);
5485 return -1;
5486 }
5487
5488 if (!params->openssl_ecdh_curves) {
5489 #ifndef OPENSSL_IS_BORINGSSL
5490 #ifndef OPENSSL_NO_EC
5491 #if OPENSSL_VERSION_NUMBER < 0x10100000L
5492 if (SSL_set_ecdh_auto(conn->ssl, 1) != 1) {
5493 wpa_printf(MSG_INFO,
5494 "OpenSSL: Failed to set ECDH curves to auto");
5495 return -1;
5496 }
5497 #endif /* < 1.1.0 */
5498 #endif /* OPENSSL_NO_EC */
5499 #endif /* OPENSSL_IS_BORINGSSL */
5500 } else if (params->openssl_ecdh_curves[0]) {
5501 #ifdef OPENSSL_IS_BORINGSSL
5502 wpa_printf(MSG_INFO,
5503 "OpenSSL: ECDH configuration not supported");
5504 return -1;
5505 #else /* !OPENSSL_IS_BORINGSSL */
5506 #ifndef OPENSSL_NO_EC
5507 if (SSL_set1_curves_list(conn->ssl,
5508 params->openssl_ecdh_curves) != 1) {
5509 wpa_printf(MSG_INFO,
5510 "OpenSSL: Failed to set ECDH curves '%s'",
5511 params->openssl_ecdh_curves);
5512 return -1;
5513 }
5514 #else /* OPENSSL_NO_EC */
5515 wpa_printf(MSG_INFO, "OpenSSL: ECDH not supported");
5516 return -1;
5517 #endif /* OPENSSL_NO_EC */
5518 #endif /* OPENSSL_IS_BORINGSSL */
5519 }
5520
5521 #ifdef OPENSSL_IS_BORINGSSL
5522 if (params->flags & TLS_CONN_REQUEST_OCSP) {
5523 SSL_enable_ocsp_stapling(conn->ssl);
5524 }
5525 #else /* OPENSSL_IS_BORINGSSL */
5526 #ifdef HAVE_OCSP
5527 if (params->flags & TLS_CONN_REQUEST_OCSP) {
5528 SSL_CTX *ssl_ctx = data->ssl;
5529 SSL_set_tlsext_status_type(conn->ssl, TLSEXT_STATUSTYPE_ocsp);
5530 SSL_CTX_set_tlsext_status_cb(ssl_ctx, ocsp_resp_cb);
5531 SSL_CTX_set_tlsext_status_arg(ssl_ctx, conn);
5532 }
5533 #else /* HAVE_OCSP */
5534 if (params->flags & TLS_CONN_REQUIRE_OCSP) {
5535 wpa_printf(MSG_INFO,
5536 "OpenSSL: No OCSP support included - reject configuration");
5537 return -1;
5538 }
5539 if (params->flags & TLS_CONN_REQUEST_OCSP) {
5540 wpa_printf(MSG_DEBUG,
5541 "OpenSSL: No OCSP support included - allow optional OCSP case to continue");
5542 }
5543 #endif /* HAVE_OCSP */
5544 #endif /* OPENSSL_IS_BORINGSSL */
5545
5546 conn->flags = params->flags;
5547
5548 tls_get_errors(data);
5549
5550 return 0;
5551 }
5552
5553
openssl_debug_dump_cipher_list(SSL_CTX * ssl_ctx)5554 static void openssl_debug_dump_cipher_list(SSL_CTX *ssl_ctx)
5555 {
5556 SSL *ssl;
5557 int i;
5558
5559 ssl = SSL_new(ssl_ctx);
5560 if (!ssl)
5561 return;
5562
5563 wpa_printf(MSG_DEBUG,
5564 "OpenSSL: Enabled cipher suites in priority order");
5565 for (i = 0; ; i++) {
5566 const char *cipher;
5567
5568 cipher = SSL_get_cipher_list(ssl, i);
5569 if (!cipher)
5570 break;
5571 wpa_printf(MSG_DEBUG, "Cipher %d: %s", i, cipher);
5572 }
5573
5574 SSL_free(ssl);
5575 }
5576
5577
5578 #if !defined(LIBRESSL_VERSION_NUMBER) && !defined(BORINGSSL_API_VERSION)
5579
openssl_pkey_type_str(const EVP_PKEY * pkey)5580 static const char * openssl_pkey_type_str(const EVP_PKEY *pkey)
5581 {
5582 if (!pkey)
5583 return "NULL";
5584 switch (EVP_PKEY_type(EVP_PKEY_id(pkey))) {
5585 case EVP_PKEY_RSA:
5586 return "RSA";
5587 case EVP_PKEY_DSA:
5588 return "DSA";
5589 case EVP_PKEY_DH:
5590 return "DH";
5591 case EVP_PKEY_EC:
5592 return "EC";
5593 default:
5594 return "?";
5595 }
5596 }
5597
5598
openssl_debug_dump_certificate(int i,X509 * cert)5599 static void openssl_debug_dump_certificate(int i, X509 *cert)
5600 {
5601 char buf[256];
5602 EVP_PKEY *pkey;
5603 ASN1_INTEGER *ser;
5604 char serial_num[128];
5605
5606 if (!cert)
5607 return;
5608
5609 X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof(buf));
5610
5611 ser = X509_get_serialNumber(cert);
5612 if (ser)
5613 wpa_snprintf_hex_uppercase(serial_num, sizeof(serial_num),
5614 ASN1_STRING_get0_data(ser),
5615 ASN1_STRING_length(ser));
5616 else
5617 serial_num[0] = '\0';
5618
5619 pkey = X509_get_pubkey(cert);
5620 wpa_printf(MSG_DEBUG, "%d: %s (%s) %s", i, buf,
5621 openssl_pkey_type_str(pkey), serial_num);
5622 EVP_PKEY_free(pkey);
5623 }
5624
5625
openssl_debug_dump_certificates(SSL_CTX * ssl_ctx)5626 static void openssl_debug_dump_certificates(SSL_CTX *ssl_ctx)
5627 {
5628 STACK_OF(X509) *certs;
5629
5630 wpa_printf(MSG_DEBUG, "OpenSSL: Configured certificate chain");
5631 if (SSL_CTX_get0_chain_certs(ssl_ctx, &certs) == 1) {
5632 int i;
5633
5634 for (i = sk_X509_num(certs); i > 0; i--)
5635 openssl_debug_dump_certificate(i, sk_X509_value(certs,
5636 i - 1));
5637 }
5638 openssl_debug_dump_certificate(0, SSL_CTX_get0_certificate(ssl_ctx));
5639 }
5640
5641 #endif
5642
5643
openssl_debug_dump_certificate_chains(SSL_CTX * ssl_ctx)5644 static void openssl_debug_dump_certificate_chains(SSL_CTX *ssl_ctx)
5645 {
5646 #if !defined(LIBRESSL_VERSION_NUMBER) && !defined(BORINGSSL_API_VERSION)
5647 int res;
5648
5649 for (res = SSL_CTX_set_current_cert(ssl_ctx, SSL_CERT_SET_FIRST);
5650 res == 1;
5651 res = SSL_CTX_set_current_cert(ssl_ctx, SSL_CERT_SET_NEXT))
5652 openssl_debug_dump_certificates(ssl_ctx);
5653
5654 SSL_CTX_set_current_cert(ssl_ctx, SSL_CERT_SET_FIRST);
5655 #endif
5656 }
5657
5658
openssl_debug_dump_ctx(SSL_CTX * ssl_ctx)5659 static void openssl_debug_dump_ctx(SSL_CTX *ssl_ctx)
5660 {
5661 openssl_debug_dump_cipher_list(ssl_ctx);
5662 openssl_debug_dump_certificate_chains(ssl_ctx);
5663 }
5664
5665
tls_global_set_params(void * tls_ctx,const struct tls_connection_params * params)5666 int tls_global_set_params(void *tls_ctx,
5667 const struct tls_connection_params *params)
5668 {
5669 struct tls_data *data = tls_ctx;
5670 SSL_CTX *ssl_ctx = data->ssl;
5671 unsigned long err;
5672
5673 while ((err = ERR_get_error())) {
5674 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
5675 __func__, ERR_error_string(err, NULL));
5676 }
5677
5678 os_free(data->check_cert_subject);
5679 data->check_cert_subject = NULL;
5680 if (params->check_cert_subject) {
5681 data->check_cert_subject =
5682 os_strdup(params->check_cert_subject);
5683 if (!data->check_cert_subject)
5684 return -1;
5685 }
5686
5687 if (tls_global_ca_cert(data, params->ca_cert) ||
5688 tls_global_client_cert(data, params->client_cert) ||
5689 tls_global_private_key(data, params->private_key,
5690 params->private_key_passwd) ||
5691 tls_global_client_cert(data, params->client_cert2) ||
5692 tls_global_private_key(data, params->private_key2,
5693 params->private_key_passwd2) ||
5694 tls_global_dh(data, params->dh_file)) {
5695 wpa_printf(MSG_INFO, "TLS: Failed to set global parameters");
5696 return -1;
5697 }
5698
5699 os_free(data->openssl_ciphers);
5700 if (params->openssl_ciphers) {
5701 data->openssl_ciphers = os_strdup(params->openssl_ciphers);
5702 if (!data->openssl_ciphers)
5703 return -1;
5704 } else {
5705 data->openssl_ciphers = NULL;
5706 }
5707 if (params->openssl_ciphers &&
5708 SSL_CTX_set_cipher_list(ssl_ctx, params->openssl_ciphers) != 1) {
5709 wpa_printf(MSG_INFO,
5710 "OpenSSL: Failed to set cipher string '%s'",
5711 params->openssl_ciphers);
5712 return -1;
5713 }
5714
5715 if (!params->openssl_ecdh_curves) {
5716 #ifndef OPENSSL_IS_BORINGSSL
5717 #ifndef OPENSSL_NO_EC
5718 #if OPENSSL_VERSION_NUMBER < 0x10100000L
5719 if (SSL_CTX_set_ecdh_auto(ssl_ctx, 1) != 1) {
5720 wpa_printf(MSG_INFO,
5721 "OpenSSL: Failed to set ECDH curves to auto");
5722 return -1;
5723 }
5724 #endif /* < 1.1.0 */
5725 #endif /* OPENSSL_NO_EC */
5726 #endif /* OPENSSL_IS_BORINGSSL */
5727 } else if (params->openssl_ecdh_curves[0]) {
5728 #ifdef OPENSSL_IS_BORINGSSL
5729 wpa_printf(MSG_INFO,
5730 "OpenSSL: ECDH configuration not supported");
5731 return -1;
5732 #else /* !OPENSSL_IS_BORINGSSL */
5733 #ifndef OPENSSL_NO_EC
5734 #if OPENSSL_VERSION_NUMBER < 0x10100000L
5735 SSL_CTX_set_ecdh_auto(ssl_ctx, 1);
5736 #endif
5737 if (SSL_CTX_set1_curves_list(ssl_ctx,
5738 params->openssl_ecdh_curves) !=
5739 1) {
5740 wpa_printf(MSG_INFO,
5741 "OpenSSL: Failed to set ECDH curves '%s'",
5742 params->openssl_ecdh_curves);
5743 return -1;
5744 }
5745 #else /* OPENSSL_NO_EC */
5746 wpa_printf(MSG_INFO, "OpenSSL: ECDH not supported");
5747 return -1;
5748 #endif /* OPENSSL_NO_EC */
5749 #endif /* OPENSSL_IS_BORINGSSL */
5750 }
5751
5752 #ifdef SSL_OP_NO_TICKET
5753 if (params->flags & TLS_CONN_DISABLE_SESSION_TICKET)
5754 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TICKET);
5755 else
5756 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TICKET);
5757 #endif /* SSL_OP_NO_TICKET */
5758
5759 #ifdef HAVE_OCSP
5760 SSL_CTX_set_tlsext_status_cb(ssl_ctx, ocsp_status_cb);
5761 SSL_CTX_set_tlsext_status_arg(ssl_ctx, ssl_ctx);
5762 os_free(tls_global->ocsp_stapling_response);
5763 if (params->ocsp_stapling_response)
5764 tls_global->ocsp_stapling_response =
5765 os_strdup(params->ocsp_stapling_response);
5766 else
5767 tls_global->ocsp_stapling_response = NULL;
5768 #endif /* HAVE_OCSP */
5769
5770 openssl_debug_dump_ctx(ssl_ctx);
5771
5772 return 0;
5773 }
5774
5775
5776 #ifdef EAP_FAST_OR_TEAP
5777 /* Pre-shared secred requires a patch to openssl, so this function is
5778 * commented out unless explicitly needed for EAP-FAST in order to be able to
5779 * build this file with unmodified openssl. */
5780
5781 #if (defined(OPENSSL_IS_BORINGSSL) || OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER)
tls_sess_sec_cb(SSL * s,void * secret,int * secret_len,STACK_OF (SSL_CIPHER)* peer_ciphers,const SSL_CIPHER ** cipher,void * arg)5782 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
5783 STACK_OF(SSL_CIPHER) *peer_ciphers,
5784 const SSL_CIPHER **cipher, void *arg)
5785 #else /* OPENSSL_IS_BORINGSSL */
5786 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
5787 STACK_OF(SSL_CIPHER) *peer_ciphers,
5788 SSL_CIPHER **cipher, void *arg)
5789 #endif /* OPENSSL_IS_BORINGSSL */
5790 {
5791 struct tls_connection *conn = arg;
5792 int ret;
5793
5794 #if OPENSSL_VERSION_NUMBER < 0x10100000L
5795 if (conn == NULL || conn->session_ticket_cb == NULL)
5796 return 0;
5797
5798 ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
5799 conn->session_ticket,
5800 conn->session_ticket_len,
5801 s->s3->client_random,
5802 s->s3->server_random, secret);
5803 #else
5804 unsigned char client_random[SSL3_RANDOM_SIZE];
5805 unsigned char server_random[SSL3_RANDOM_SIZE];
5806
5807 if (conn == NULL || conn->session_ticket_cb == NULL)
5808 return 0;
5809
5810 SSL_get_client_random(s, client_random, sizeof(client_random));
5811 SSL_get_server_random(s, server_random, sizeof(server_random));
5812
5813 ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
5814 conn->session_ticket,
5815 conn->session_ticket_len,
5816 client_random,
5817 server_random, secret);
5818 #endif
5819
5820 os_free(conn->session_ticket);
5821 conn->session_ticket = NULL;
5822
5823 if (ret <= 0)
5824 return 0;
5825
5826 *secret_len = SSL_MAX_MASTER_KEY_LENGTH;
5827 return 1;
5828 }
5829
5830
tls_session_ticket_ext_cb(SSL * s,const unsigned char * data,int len,void * arg)5831 static int tls_session_ticket_ext_cb(SSL *s, const unsigned char *data,
5832 int len, void *arg)
5833 {
5834 struct tls_connection *conn = arg;
5835
5836 if (conn == NULL || conn->session_ticket_cb == NULL)
5837 return 0;
5838
5839 wpa_printf(MSG_DEBUG, "OpenSSL: %s: length=%d", __func__, len);
5840
5841 os_free(conn->session_ticket);
5842 conn->session_ticket = NULL;
5843
5844 wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
5845 "extension", data, len);
5846
5847 conn->session_ticket = os_memdup(data, len);
5848 if (conn->session_ticket == NULL)
5849 return 0;
5850
5851 conn->session_ticket_len = len;
5852
5853 return 1;
5854 }
5855 #endif /* EAP_FAST_OR_TEAP */
5856
5857
tls_connection_set_session_ticket_cb(void * tls_ctx,struct tls_connection * conn,tls_session_ticket_cb cb,void * ctx)5858 int tls_connection_set_session_ticket_cb(void *tls_ctx,
5859 struct tls_connection *conn,
5860 tls_session_ticket_cb cb,
5861 void *ctx)
5862 {
5863 #ifdef EAP_FAST_OR_TEAP
5864 conn->session_ticket_cb = cb;
5865 conn->session_ticket_cb_ctx = ctx;
5866
5867 if (cb) {
5868 if (SSL_set_session_secret_cb(conn->ssl, tls_sess_sec_cb,
5869 conn) != 1)
5870 return -1;
5871 SSL_set_session_ticket_ext_cb(conn->ssl,
5872 tls_session_ticket_ext_cb, conn);
5873 } else {
5874 if (SSL_set_session_secret_cb(conn->ssl, NULL, NULL) != 1)
5875 return -1;
5876 SSL_set_session_ticket_ext_cb(conn->ssl, NULL, NULL);
5877 }
5878
5879 return 0;
5880 #else /* EAP_FAST_OR_TEAP */
5881 return -1;
5882 #endif /* EAP_FAST_OR_TEAP */
5883 }
5884
5885
tls_get_library_version(char * buf,size_t buf_len)5886 int tls_get_library_version(char *buf, size_t buf_len)
5887 {
5888 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
5889 return os_snprintf(buf, buf_len, "OpenSSL build=%s run=%s",
5890 OPENSSL_VERSION_TEXT,
5891 OpenSSL_version(OPENSSL_VERSION));
5892 #else
5893 return os_snprintf(buf, buf_len, "OpenSSL build=%s run=%s",
5894 OPENSSL_VERSION_TEXT,
5895 SSLeay_version(SSLEAY_VERSION));
5896 #endif
5897 }
5898
5899
tls_connection_set_success_data(struct tls_connection * conn,struct wpabuf * data)5900 void tls_connection_set_success_data(struct tls_connection *conn,
5901 struct wpabuf *data)
5902 {
5903 SSL_SESSION *sess;
5904 struct wpabuf *old;
5905 struct tls_session_data *sess_data = NULL;
5906
5907 if (tls_ex_idx_session < 0)
5908 goto fail;
5909 sess = SSL_get_session(conn->ssl);
5910 if (!sess)
5911 goto fail;
5912 old = SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
5913 if (old) {
5914 struct tls_session_data *found;
5915
5916 found = get_session_data(conn->context, old);
5917 wpa_printf(MSG_DEBUG,
5918 "OpenSSL: Replacing old success data %p (sess %p)%s",
5919 old, sess, found ? "" : " (not freeing)");
5920 if (found) {
5921 dl_list_del(&found->list);
5922 os_free(found);
5923 wpabuf_free(old);
5924 }
5925 }
5926
5927 sess_data = os_zalloc(sizeof(*sess_data));
5928 if (!sess_data ||
5929 SSL_SESSION_set_ex_data(sess, tls_ex_idx_session, data) != 1)
5930 goto fail;
5931
5932 sess_data->buf = data;
5933 dl_list_add(&conn->context->sessions, &sess_data->list);
5934 wpa_printf(MSG_DEBUG, "OpenSSL: Stored success data %p (sess %p)",
5935 data, sess);
5936 conn->success_data = 1;
5937 return;
5938
5939 fail:
5940 wpa_printf(MSG_INFO, "OpenSSL: Failed to store success data");
5941 wpabuf_free(data);
5942 os_free(sess_data);
5943 }
5944
5945
tls_connection_set_success_data_resumed(struct tls_connection * conn)5946 void tls_connection_set_success_data_resumed(struct tls_connection *conn)
5947 {
5948 wpa_printf(MSG_DEBUG,
5949 "OpenSSL: Success data accepted for resumed session");
5950 conn->success_data = 1;
5951 }
5952
5953
5954 const struct wpabuf *
tls_connection_get_success_data(struct tls_connection * conn)5955 tls_connection_get_success_data(struct tls_connection *conn)
5956 {
5957 SSL_SESSION *sess;
5958
5959 if (tls_ex_idx_session < 0 ||
5960 !(sess = SSL_get_session(conn->ssl)))
5961 return NULL;
5962 return SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
5963 }
5964
5965
tls_connection_remove_session(struct tls_connection * conn)5966 void tls_connection_remove_session(struct tls_connection *conn)
5967 {
5968 SSL_SESSION *sess;
5969
5970 sess = SSL_get_session(conn->ssl);
5971 if (!sess)
5972 return;
5973
5974 if (SSL_CTX_remove_session(conn->ssl_ctx, sess) != 1)
5975 wpa_printf(MSG_DEBUG,
5976 "OpenSSL: Session was not cached");
5977 else
5978 wpa_printf(MSG_DEBUG,
5979 "OpenSSL: Removed cached session to disable session resumption");
5980 }
5981
5982
tls_get_tls_unique(struct tls_connection * conn,u8 * buf,size_t max_len)5983 int tls_get_tls_unique(struct tls_connection *conn, u8 *buf, size_t max_len)
5984 {
5985 size_t len;
5986 int reused;
5987
5988 reused = SSL_session_reused(conn->ssl);
5989 if ((conn->server && !reused) || (!conn->server && reused))
5990 len = SSL_get_peer_finished(conn->ssl, buf, max_len);
5991 else
5992 len = SSL_get_finished(conn->ssl, buf, max_len);
5993
5994 if (len == 0 || len > max_len)
5995 return -1;
5996
5997 return len;
5998 }
5999
6000
tls_connection_get_cipher_suite(struct tls_connection * conn)6001 u16 tls_connection_get_cipher_suite(struct tls_connection *conn)
6002 {
6003 const SSL_CIPHER *cipher;
6004
6005 cipher = SSL_get_current_cipher(conn->ssl);
6006 if (!cipher)
6007 return 0;
6008 #if OPENSSL_VERSION_NUMBER >= 0x10101000L && !defined(LIBRESSL_VERSION_NUMBER)
6009 return SSL_CIPHER_get_protocol_id(cipher);
6010 #else
6011 return SSL_CIPHER_get_id(cipher) & 0xFFFF;
6012 #endif
6013 }
6014
6015
tls_connection_get_peer_subject(struct tls_connection * conn)6016 const char * tls_connection_get_peer_subject(struct tls_connection *conn)
6017 {
6018 if (conn)
6019 return conn->peer_subject;
6020 return NULL;
6021 }
6022
6023
tls_connection_get_own_cert_used(struct tls_connection * conn)6024 bool tls_connection_get_own_cert_used(struct tls_connection *conn)
6025 {
6026 if (conn)
6027 return SSL_get_certificate(conn->ssl) != NULL;
6028 return false;
6029 }
6030