xref: /freebsd/contrib/wpa/src/crypto/tls_openssl.c (revision 39beb93c3f8bdbf72a61fda42300b5ebed7390c8)
1 /*
2  * WPA Supplicant / SSL/TLS interface functions for openssl
3  * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation.
8  *
9  * Alternatively, this software may be distributed under the terms of BSD
10  * license.
11  *
12  * See README and COPYING for more details.
13  */
14 
15 #include "includes.h"
16 
17 #ifndef CONFIG_SMARTCARD
18 #ifndef OPENSSL_NO_ENGINE
19 #define OPENSSL_NO_ENGINE
20 #endif
21 #endif
22 
23 #include <openssl/ssl.h>
24 #include <openssl/err.h>
25 #include <openssl/pkcs12.h>
26 #include <openssl/x509v3.h>
27 #ifndef OPENSSL_NO_ENGINE
28 #include <openssl/engine.h>
29 #endif /* OPENSSL_NO_ENGINE */
30 
31 #include "common.h"
32 #include "tls.h"
33 
34 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
35 #define OPENSSL_d2i_TYPE const unsigned char **
36 #else
37 #define OPENSSL_d2i_TYPE unsigned char **
38 #endif
39 
40 #ifdef SSL_F_SSL_SET_SESSION_TICKET_EXT
41 #ifdef SSL_OP_NO_TICKET
42 /*
43  * Session ticket override patch was merged into OpenSSL 0.9.9 tree on
44  * 2008-11-15. This version uses a bit different API compared to the old patch.
45  */
46 #define CONFIG_OPENSSL_TICKET_OVERRIDE
47 #endif
48 #endif
49 
50 static int tls_openssl_ref_count = 0;
51 
52 struct tls_connection {
53 	SSL *ssl;
54 	BIO *ssl_in, *ssl_out;
55 #ifndef OPENSSL_NO_ENGINE
56 	ENGINE *engine;        /* functional reference to the engine */
57 	EVP_PKEY *private_key; /* the private key if using engine */
58 #endif /* OPENSSL_NO_ENGINE */
59 	char *subject_match, *altsubject_match;
60 	int read_alerts, write_alerts, failed;
61 
62 	tls_session_ticket_cb session_ticket_cb;
63 	void *session_ticket_cb_ctx;
64 
65 	/* SessionTicket received from OpenSSL hello_extension_cb (server) */
66 	u8 *session_ticket;
67 	size_t session_ticket_len;
68 };
69 
70 
71 #ifdef CONFIG_NO_STDOUT_DEBUG
72 
73 static void _tls_show_errors(void)
74 {
75 	unsigned long err;
76 
77 	while ((err = ERR_get_error())) {
78 		/* Just ignore the errors, since stdout is disabled */
79 	}
80 }
81 #define tls_show_errors(l, f, t) _tls_show_errors()
82 
83 #else /* CONFIG_NO_STDOUT_DEBUG */
84 
85 static void tls_show_errors(int level, const char *func, const char *txt)
86 {
87 	unsigned long err;
88 
89 	wpa_printf(level, "OpenSSL: %s - %s %s",
90 		   func, txt, ERR_error_string(ERR_get_error(), NULL));
91 
92 	while ((err = ERR_get_error())) {
93 		wpa_printf(MSG_INFO, "OpenSSL: pending error: %s",
94 			   ERR_error_string(err, NULL));
95 	}
96 }
97 
98 #endif /* CONFIG_NO_STDOUT_DEBUG */
99 
100 
101 #ifdef CONFIG_NATIVE_WINDOWS
102 
103 /* Windows CryptoAPI and access to certificate stores */
104 #include <wincrypt.h>
105 
106 #ifdef __MINGW32_VERSION
107 /*
108  * MinGW does not yet include all the needed definitions for CryptoAPI, so
109  * define here whatever extra is needed.
110  */
111 #define CALG_SSL3_SHAMD5 (ALG_CLASS_HASH | ALG_TYPE_ANY | ALG_SID_SSL3SHAMD5)
112 #define CERT_SYSTEM_STORE_CURRENT_USER (1 << 16)
113 #define CERT_STORE_READONLY_FLAG 0x00008000
114 #define CERT_STORE_OPEN_EXISTING_FLAG 0x00004000
115 #define CRYPT_ACQUIRE_COMPARE_KEY_FLAG 0x00000004
116 
117 static BOOL WINAPI
118 (*CryptAcquireCertificatePrivateKey)(PCCERT_CONTEXT pCert, DWORD dwFlags,
119 				     void *pvReserved, HCRYPTPROV *phCryptProv,
120 				     DWORD *pdwKeySpec, BOOL *pfCallerFreeProv)
121 = NULL; /* to be loaded from crypt32.dll */
122 
123 #ifdef CONFIG_MINGW32_LOAD_CERTENUM
124 static PCCERT_CONTEXT WINAPI
125 (*CertEnumCertificatesInStore)(HCERTSTORE hCertStore,
126 			       PCCERT_CONTEXT pPrevCertContext)
127 = NULL; /* to be loaded from crypt32.dll */
128 #endif /* CONFIG_MINGW32_LOAD_CERTENUM */
129 
130 static int mingw_load_crypto_func(void)
131 {
132 	HINSTANCE dll;
133 
134 	/* MinGW does not yet have full CryptoAPI support, so load the needed
135 	 * function here. */
136 
137 	if (CryptAcquireCertificatePrivateKey)
138 		return 0;
139 
140 	dll = LoadLibrary("crypt32");
141 	if (dll == NULL) {
142 		wpa_printf(MSG_DEBUG, "CryptoAPI: Could not load crypt32 "
143 			   "library");
144 		return -1;
145 	}
146 
147 	CryptAcquireCertificatePrivateKey = GetProcAddress(
148 		dll, "CryptAcquireCertificatePrivateKey");
149 	if (CryptAcquireCertificatePrivateKey == NULL) {
150 		wpa_printf(MSG_DEBUG, "CryptoAPI: Could not get "
151 			   "CryptAcquireCertificatePrivateKey() address from "
152 			   "crypt32 library");
153 		return -1;
154 	}
155 
156 #ifdef CONFIG_MINGW32_LOAD_CERTENUM
157 	CertEnumCertificatesInStore = (void *) GetProcAddress(
158 		dll, "CertEnumCertificatesInStore");
159 	if (CertEnumCertificatesInStore == NULL) {
160 		wpa_printf(MSG_DEBUG, "CryptoAPI: Could not get "
161 			   "CertEnumCertificatesInStore() address from "
162 			   "crypt32 library");
163 		return -1;
164 	}
165 #endif /* CONFIG_MINGW32_LOAD_CERTENUM */
166 
167 	return 0;
168 }
169 
170 #else /* __MINGW32_VERSION */
171 
172 static int mingw_load_crypto_func(void)
173 {
174 	return 0;
175 }
176 
177 #endif /* __MINGW32_VERSION */
178 
179 
180 struct cryptoapi_rsa_data {
181 	const CERT_CONTEXT *cert;
182 	HCRYPTPROV crypt_prov;
183 	DWORD key_spec;
184 	BOOL free_crypt_prov;
185 };
186 
187 
188 static void cryptoapi_error(const char *msg)
189 {
190 	wpa_printf(MSG_INFO, "CryptoAPI: %s; err=%u",
191 		   msg, (unsigned int) GetLastError());
192 }
193 
194 
195 static int cryptoapi_rsa_pub_enc(int flen, const unsigned char *from,
196 				 unsigned char *to, RSA *rsa, int padding)
197 {
198 	wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
199 	return 0;
200 }
201 
202 
203 static int cryptoapi_rsa_pub_dec(int flen, const unsigned char *from,
204 				 unsigned char *to, RSA *rsa, int padding)
205 {
206 	wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
207 	return 0;
208 }
209 
210 
211 static int cryptoapi_rsa_priv_enc(int flen, const unsigned char *from,
212 				  unsigned char *to, RSA *rsa, int padding)
213 {
214 	struct cryptoapi_rsa_data *priv =
215 		(struct cryptoapi_rsa_data *) rsa->meth->app_data;
216 	HCRYPTHASH hash;
217 	DWORD hash_size, len, i;
218 	unsigned char *buf = NULL;
219 	int ret = 0;
220 
221 	if (priv == NULL) {
222 		RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
223 		       ERR_R_PASSED_NULL_PARAMETER);
224 		return 0;
225 	}
226 
227 	if (padding != RSA_PKCS1_PADDING) {
228 		RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
229 		       RSA_R_UNKNOWN_PADDING_TYPE);
230 		return 0;
231 	}
232 
233 	if (flen != 16 /* MD5 */ + 20 /* SHA-1 */) {
234 		wpa_printf(MSG_INFO, "%s - only MD5-SHA1 hash supported",
235 			   __func__);
236 		RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
237 		       RSA_R_INVALID_MESSAGE_LENGTH);
238 		return 0;
239 	}
240 
241 	if (!CryptCreateHash(priv->crypt_prov, CALG_SSL3_SHAMD5, 0, 0, &hash))
242 	{
243 		cryptoapi_error("CryptCreateHash failed");
244 		return 0;
245 	}
246 
247 	len = sizeof(hash_size);
248 	if (!CryptGetHashParam(hash, HP_HASHSIZE, (BYTE *) &hash_size, &len,
249 			       0)) {
250 		cryptoapi_error("CryptGetHashParam failed");
251 		goto err;
252 	}
253 
254 	if ((int) hash_size != flen) {
255 		wpa_printf(MSG_INFO, "CryptoAPI: Invalid hash size (%u != %d)",
256 			   (unsigned) hash_size, flen);
257 		RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
258 		       RSA_R_INVALID_MESSAGE_LENGTH);
259 		goto err;
260 	}
261 	if (!CryptSetHashParam(hash, HP_HASHVAL, (BYTE * ) from, 0)) {
262 		cryptoapi_error("CryptSetHashParam failed");
263 		goto err;
264 	}
265 
266 	len = RSA_size(rsa);
267 	buf = os_malloc(len);
268 	if (buf == NULL) {
269 		RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE);
270 		goto err;
271 	}
272 
273 	if (!CryptSignHash(hash, priv->key_spec, NULL, 0, buf, &len)) {
274 		cryptoapi_error("CryptSignHash failed");
275 		goto err;
276 	}
277 
278 	for (i = 0; i < len; i++)
279 		to[i] = buf[len - i - 1];
280 	ret = len;
281 
282 err:
283 	os_free(buf);
284 	CryptDestroyHash(hash);
285 
286 	return ret;
287 }
288 
289 
290 static int cryptoapi_rsa_priv_dec(int flen, const unsigned char *from,
291 				  unsigned char *to, RSA *rsa, int padding)
292 {
293 	wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
294 	return 0;
295 }
296 
297 
298 static void cryptoapi_free_data(struct cryptoapi_rsa_data *priv)
299 {
300 	if (priv == NULL)
301 		return;
302 	if (priv->crypt_prov && priv->free_crypt_prov)
303 		CryptReleaseContext(priv->crypt_prov, 0);
304 	if (priv->cert)
305 		CertFreeCertificateContext(priv->cert);
306 	os_free(priv);
307 }
308 
309 
310 static int cryptoapi_finish(RSA *rsa)
311 {
312 	cryptoapi_free_data((struct cryptoapi_rsa_data *) rsa->meth->app_data);
313 	os_free((void *) rsa->meth);
314 	rsa->meth = NULL;
315 	return 1;
316 }
317 
318 
319 static const CERT_CONTEXT * cryptoapi_find_cert(const char *name, DWORD store)
320 {
321 	HCERTSTORE cs;
322 	const CERT_CONTEXT *ret = NULL;
323 
324 	cs = CertOpenStore((LPCSTR) CERT_STORE_PROV_SYSTEM, 0, 0,
325 			   store | CERT_STORE_OPEN_EXISTING_FLAG |
326 			   CERT_STORE_READONLY_FLAG, L"MY");
327 	if (cs == NULL) {
328 		cryptoapi_error("Failed to open 'My system store'");
329 		return NULL;
330 	}
331 
332 	if (strncmp(name, "cert://", 7) == 0) {
333 		unsigned short wbuf[255];
334 		MultiByteToWideChar(CP_ACP, 0, name + 7, -1, wbuf, 255);
335 		ret = CertFindCertificateInStore(cs, X509_ASN_ENCODING |
336 						 PKCS_7_ASN_ENCODING,
337 						 0, CERT_FIND_SUBJECT_STR,
338 						 wbuf, NULL);
339 	} else if (strncmp(name, "hash://", 7) == 0) {
340 		CRYPT_HASH_BLOB blob;
341 		int len;
342 		const char *hash = name + 7;
343 		unsigned char *buf;
344 
345 		len = os_strlen(hash) / 2;
346 		buf = os_malloc(len);
347 		if (buf && hexstr2bin(hash, buf, len) == 0) {
348 			blob.cbData = len;
349 			blob.pbData = buf;
350 			ret = CertFindCertificateInStore(cs,
351 							 X509_ASN_ENCODING |
352 							 PKCS_7_ASN_ENCODING,
353 							 0, CERT_FIND_HASH,
354 							 &blob, NULL);
355 		}
356 		os_free(buf);
357 	}
358 
359 	CertCloseStore(cs, 0);
360 
361 	return ret;
362 }
363 
364 
365 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
366 {
367 	X509 *cert = NULL;
368 	RSA *rsa = NULL, *pub_rsa;
369 	struct cryptoapi_rsa_data *priv;
370 	RSA_METHOD *rsa_meth;
371 
372 	if (name == NULL ||
373 	    (strncmp(name, "cert://", 7) != 0 &&
374 	     strncmp(name, "hash://", 7) != 0))
375 		return -1;
376 
377 	priv = os_zalloc(sizeof(*priv));
378 	rsa_meth = os_zalloc(sizeof(*rsa_meth));
379 	if (priv == NULL || rsa_meth == NULL) {
380 		wpa_printf(MSG_WARNING, "CryptoAPI: Failed to allocate memory "
381 			   "for CryptoAPI RSA method");
382 		os_free(priv);
383 		os_free(rsa_meth);
384 		return -1;
385 	}
386 
387 	priv->cert = cryptoapi_find_cert(name, CERT_SYSTEM_STORE_CURRENT_USER);
388 	if (priv->cert == NULL) {
389 		priv->cert = cryptoapi_find_cert(
390 			name, CERT_SYSTEM_STORE_LOCAL_MACHINE);
391 	}
392 	if (priv->cert == NULL) {
393 		wpa_printf(MSG_INFO, "CryptoAPI: Could not find certificate "
394 			   "'%s'", name);
395 		goto err;
396 	}
397 
398 	cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &priv->cert->pbCertEncoded,
399 			priv->cert->cbCertEncoded);
400 	if (cert == NULL) {
401 		wpa_printf(MSG_INFO, "CryptoAPI: Could not process X509 DER "
402 			   "encoding");
403 		goto err;
404 	}
405 
406 	if (mingw_load_crypto_func())
407 		goto err;
408 
409 	if (!CryptAcquireCertificatePrivateKey(priv->cert,
410 					       CRYPT_ACQUIRE_COMPARE_KEY_FLAG,
411 					       NULL, &priv->crypt_prov,
412 					       &priv->key_spec,
413 					       &priv->free_crypt_prov)) {
414 		cryptoapi_error("Failed to acquire a private key for the "
415 				"certificate");
416 		goto err;
417 	}
418 
419 	rsa_meth->name = "Microsoft CryptoAPI RSA Method";
420 	rsa_meth->rsa_pub_enc = cryptoapi_rsa_pub_enc;
421 	rsa_meth->rsa_pub_dec = cryptoapi_rsa_pub_dec;
422 	rsa_meth->rsa_priv_enc = cryptoapi_rsa_priv_enc;
423 	rsa_meth->rsa_priv_dec = cryptoapi_rsa_priv_dec;
424 	rsa_meth->finish = cryptoapi_finish;
425 	rsa_meth->flags = RSA_METHOD_FLAG_NO_CHECK;
426 	rsa_meth->app_data = (char *) priv;
427 
428 	rsa = RSA_new();
429 	if (rsa == NULL) {
430 		SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE,
431 		       ERR_R_MALLOC_FAILURE);
432 		goto err;
433 	}
434 
435 	if (!SSL_use_certificate(ssl, cert)) {
436 		RSA_free(rsa);
437 		rsa = NULL;
438 		goto err;
439 	}
440 	pub_rsa = cert->cert_info->key->pkey->pkey.rsa;
441 	X509_free(cert);
442 	cert = NULL;
443 
444 	rsa->n = BN_dup(pub_rsa->n);
445 	rsa->e = BN_dup(pub_rsa->e);
446 	if (!RSA_set_method(rsa, rsa_meth))
447 		goto err;
448 
449 	if (!SSL_use_RSAPrivateKey(ssl, rsa))
450 		goto err;
451 	RSA_free(rsa);
452 
453 	return 0;
454 
455 err:
456 	if (cert)
457 		X509_free(cert);
458 	if (rsa)
459 		RSA_free(rsa);
460 	else {
461 		os_free(rsa_meth);
462 		cryptoapi_free_data(priv);
463 	}
464 	return -1;
465 }
466 
467 
468 static int tls_cryptoapi_ca_cert(SSL_CTX *ssl_ctx, SSL *ssl, const char *name)
469 {
470 	HCERTSTORE cs;
471 	PCCERT_CONTEXT ctx = NULL;
472 	X509 *cert;
473 	char buf[128];
474 	const char *store;
475 #ifdef UNICODE
476 	WCHAR *wstore;
477 #endif /* UNICODE */
478 
479 	if (mingw_load_crypto_func())
480 		return -1;
481 
482 	if (name == NULL || strncmp(name, "cert_store://", 13) != 0)
483 		return -1;
484 
485 	store = name + 13;
486 #ifdef UNICODE
487 	wstore = os_malloc((os_strlen(store) + 1) * sizeof(WCHAR));
488 	if (wstore == NULL)
489 		return -1;
490 	wsprintf(wstore, L"%S", store);
491 	cs = CertOpenSystemStore(0, wstore);
492 	os_free(wstore);
493 #else /* UNICODE */
494 	cs = CertOpenSystemStore(0, store);
495 #endif /* UNICODE */
496 	if (cs == NULL) {
497 		wpa_printf(MSG_DEBUG, "%s: failed to open system cert store "
498 			   "'%s': error=%d", __func__, store,
499 			   (int) GetLastError());
500 		return -1;
501 	}
502 
503 	while ((ctx = CertEnumCertificatesInStore(cs, ctx))) {
504 		cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &ctx->pbCertEncoded,
505 				ctx->cbCertEncoded);
506 		if (cert == NULL) {
507 			wpa_printf(MSG_INFO, "CryptoAPI: Could not process "
508 				   "X509 DER encoding for CA cert");
509 			continue;
510 		}
511 
512 		X509_NAME_oneline(X509_get_subject_name(cert), buf,
513 				  sizeof(buf));
514 		wpa_printf(MSG_DEBUG, "OpenSSL: Loaded CA certificate for "
515 			   "system certificate store: subject='%s'", buf);
516 
517 		if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
518 			tls_show_errors(MSG_WARNING, __func__,
519 					"Failed to add ca_cert to OpenSSL "
520 					"certificate store");
521 		}
522 
523 		X509_free(cert);
524 	}
525 
526 	if (!CertCloseStore(cs, 0)) {
527 		wpa_printf(MSG_DEBUG, "%s: failed to close system cert store "
528 			   "'%s': error=%d", __func__, name + 13,
529 			   (int) GetLastError());
530 	}
531 
532 	return 0;
533 }
534 
535 
536 #else /* CONFIG_NATIVE_WINDOWS */
537 
538 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
539 {
540 	return -1;
541 }
542 
543 #endif /* CONFIG_NATIVE_WINDOWS */
544 
545 
546 static void ssl_info_cb(const SSL *ssl, int where, int ret)
547 {
548 	const char *str;
549 	int w;
550 
551 	wpa_printf(MSG_DEBUG, "SSL: (where=0x%x ret=0x%x)", where, ret);
552 	w = where & ~SSL_ST_MASK;
553 	if (w & SSL_ST_CONNECT)
554 		str = "SSL_connect";
555 	else if (w & SSL_ST_ACCEPT)
556 		str = "SSL_accept";
557 	else
558 		str = "undefined";
559 
560 	if (where & SSL_CB_LOOP) {
561 		wpa_printf(MSG_DEBUG, "SSL: %s:%s",
562 			   str, SSL_state_string_long(ssl));
563 	} else if (where & SSL_CB_ALERT) {
564 		wpa_printf(MSG_INFO, "SSL: SSL3 alert: %s:%s:%s",
565 			   where & SSL_CB_READ ?
566 			   "read (remote end reported an error)" :
567 			   "write (local SSL3 detected an error)",
568 			   SSL_alert_type_string_long(ret),
569 			   SSL_alert_desc_string_long(ret));
570 		if ((ret >> 8) == SSL3_AL_FATAL) {
571 			struct tls_connection *conn =
572 				SSL_get_app_data((SSL *) ssl);
573 			if (where & SSL_CB_READ)
574 				conn->read_alerts++;
575 			else
576 				conn->write_alerts++;
577 		}
578 	} else if (where & SSL_CB_EXIT && ret <= 0) {
579 		wpa_printf(MSG_DEBUG, "SSL: %s:%s in %s",
580 			   str, ret == 0 ? "failed" : "error",
581 			   SSL_state_string_long(ssl));
582 	}
583 }
584 
585 
586 #ifndef OPENSSL_NO_ENGINE
587 /**
588  * tls_engine_load_dynamic_generic - load any openssl engine
589  * @pre: an array of commands and values that load an engine initialized
590  *       in the engine specific function
591  * @post: an array of commands and values that initialize an already loaded
592  *        engine (or %NULL if not required)
593  * @id: the engine id of the engine to load (only required if post is not %NULL
594  *
595  * This function is a generic function that loads any openssl engine.
596  *
597  * Returns: 0 on success, -1 on failure
598  */
599 static int tls_engine_load_dynamic_generic(const char *pre[],
600 					   const char *post[], const char *id)
601 {
602 	ENGINE *engine;
603 	const char *dynamic_id = "dynamic";
604 
605 	engine = ENGINE_by_id(id);
606 	if (engine) {
607 		ENGINE_free(engine);
608 		wpa_printf(MSG_DEBUG, "ENGINE: engine '%s' is already "
609 			   "available", id);
610 		return 0;
611 	}
612 	ERR_clear_error();
613 
614 	engine = ENGINE_by_id(dynamic_id);
615 	if (engine == NULL) {
616 		wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
617 			   dynamic_id,
618 			   ERR_error_string(ERR_get_error(), NULL));
619 		return -1;
620 	}
621 
622 	/* Perform the pre commands. This will load the engine. */
623 	while (pre && pre[0]) {
624 		wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", pre[0], pre[1]);
625 		if (ENGINE_ctrl_cmd_string(engine, pre[0], pre[1], 0) == 0) {
626 			wpa_printf(MSG_INFO, "ENGINE: ctrl cmd_string failed: "
627 				   "%s %s [%s]", pre[0], pre[1],
628 				   ERR_error_string(ERR_get_error(), NULL));
629 			ENGINE_free(engine);
630 			return -1;
631 		}
632 		pre += 2;
633 	}
634 
635 	/*
636 	 * Free the reference to the "dynamic" engine. The loaded engine can
637 	 * now be looked up using ENGINE_by_id().
638 	 */
639 	ENGINE_free(engine);
640 
641 	engine = ENGINE_by_id(id);
642 	if (engine == NULL) {
643 		wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
644 			   id, ERR_error_string(ERR_get_error(), NULL));
645 		return -1;
646 	}
647 
648 	while (post && post[0]) {
649 		wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", post[0], post[1]);
650 		if (ENGINE_ctrl_cmd_string(engine, post[0], post[1], 0) == 0) {
651 			wpa_printf(MSG_DEBUG, "ENGINE: ctrl cmd_string failed:"
652 				" %s %s [%s]", post[0], post[1],
653 				   ERR_error_string(ERR_get_error(), NULL));
654 			ENGINE_remove(engine);
655 			ENGINE_free(engine);
656 			return -1;
657 		}
658 		post += 2;
659 	}
660 	ENGINE_free(engine);
661 
662 	return 0;
663 }
664 
665 
666 /**
667  * tls_engine_load_dynamic_pkcs11 - load the pkcs11 engine provided by opensc
668  * @pkcs11_so_path: pksc11_so_path from the configuration
669  * @pcks11_module_path: pkcs11_module_path from the configuration
670  */
671 static int tls_engine_load_dynamic_pkcs11(const char *pkcs11_so_path,
672 					  const char *pkcs11_module_path)
673 {
674 	char *engine_id = "pkcs11";
675 	const char *pre_cmd[] = {
676 		"SO_PATH", NULL /* pkcs11_so_path */,
677 		"ID", NULL /* engine_id */,
678 		"LIST_ADD", "1",
679 		/* "NO_VCHECK", "1", */
680 		"LOAD", NULL,
681 		NULL, NULL
682 	};
683 	const char *post_cmd[] = {
684 		"MODULE_PATH", NULL /* pkcs11_module_path */,
685 		NULL, NULL
686 	};
687 
688 	if (!pkcs11_so_path || !pkcs11_module_path)
689 		return 0;
690 
691 	pre_cmd[1] = pkcs11_so_path;
692 	pre_cmd[3] = engine_id;
693 	post_cmd[1] = pkcs11_module_path;
694 
695 	wpa_printf(MSG_DEBUG, "ENGINE: Loading pkcs11 Engine from %s",
696 		   pkcs11_so_path);
697 
698 	return tls_engine_load_dynamic_generic(pre_cmd, post_cmd, engine_id);
699 }
700 
701 
702 /**
703  * tls_engine_load_dynamic_opensc - load the opensc engine provided by opensc
704  * @opensc_so_path: opensc_so_path from the configuration
705  */
706 static int tls_engine_load_dynamic_opensc(const char *opensc_so_path)
707 {
708 	char *engine_id = "opensc";
709 	const char *pre_cmd[] = {
710 		"SO_PATH", NULL /* opensc_so_path */,
711 		"ID", NULL /* engine_id */,
712 		"LIST_ADD", "1",
713 		"LOAD", NULL,
714 		NULL, NULL
715 	};
716 
717 	if (!opensc_so_path)
718 		return 0;
719 
720 	pre_cmd[1] = opensc_so_path;
721 	pre_cmd[3] = engine_id;
722 
723 	wpa_printf(MSG_DEBUG, "ENGINE: Loading OpenSC Engine from %s",
724 		   opensc_so_path);
725 
726 	return tls_engine_load_dynamic_generic(pre_cmd, NULL, engine_id);
727 }
728 #endif /* OPENSSL_NO_ENGINE */
729 
730 
731 void * tls_init(const struct tls_config *conf)
732 {
733 	SSL_CTX *ssl;
734 
735 	if (tls_openssl_ref_count == 0) {
736 		SSL_load_error_strings();
737 		SSL_library_init();
738 		/* TODO: if /dev/urandom is available, PRNG is seeded
739 		 * automatically. If this is not the case, random data should
740 		 * be added here. */
741 
742 #ifdef PKCS12_FUNCS
743 		PKCS12_PBE_add();
744 #endif  /* PKCS12_FUNCS */
745 	}
746 	tls_openssl_ref_count++;
747 
748 	ssl = SSL_CTX_new(TLSv1_method());
749 	if (ssl == NULL)
750 		return NULL;
751 
752 	SSL_CTX_set_info_callback(ssl, ssl_info_cb);
753 
754 #ifndef OPENSSL_NO_ENGINE
755 	if (conf &&
756 	    (conf->opensc_engine_path || conf->pkcs11_engine_path ||
757 	     conf->pkcs11_module_path)) {
758 		wpa_printf(MSG_DEBUG, "ENGINE: Loading dynamic engine");
759 		ERR_load_ENGINE_strings();
760 		ENGINE_load_dynamic();
761 
762 		if (tls_engine_load_dynamic_opensc(conf->opensc_engine_path) ||
763 		    tls_engine_load_dynamic_pkcs11(conf->pkcs11_engine_path,
764 						   conf->pkcs11_module_path)) {
765 			tls_deinit(ssl);
766 			return NULL;
767 		}
768 	}
769 #endif /* OPENSSL_NO_ENGINE */
770 
771 	return ssl;
772 }
773 
774 
775 void tls_deinit(void *ssl_ctx)
776 {
777 	SSL_CTX *ssl = ssl_ctx;
778 	SSL_CTX_free(ssl);
779 
780 	tls_openssl_ref_count--;
781 	if (tls_openssl_ref_count == 0) {
782 #ifndef OPENSSL_NO_ENGINE
783 		ENGINE_cleanup();
784 #endif /* OPENSSL_NO_ENGINE */
785 		CRYPTO_cleanup_all_ex_data();
786 		ERR_remove_state(0);
787 		ERR_free_strings();
788 		EVP_cleanup();
789 	}
790 }
791 
792 
793 static int tls_engine_init(struct tls_connection *conn, const char *engine_id,
794 			   const char *pin, const char *key_id,
795 			   const char *cert_id, const char *ca_cert_id)
796 {
797 #ifndef OPENSSL_NO_ENGINE
798 	int ret = -1;
799 	if (engine_id == NULL) {
800 		wpa_printf(MSG_ERROR, "ENGINE: Engine ID not set");
801 		return -1;
802 	}
803 	if (pin == NULL) {
804 		wpa_printf(MSG_ERROR, "ENGINE: Smartcard PIN not set");
805 		return -1;
806 	}
807 	if (key_id == NULL) {
808 		wpa_printf(MSG_ERROR, "ENGINE: Key Id not set");
809 		return -1;
810 	}
811 
812 	ERR_clear_error();
813 	conn->engine = ENGINE_by_id(engine_id);
814 	if (!conn->engine) {
815 		wpa_printf(MSG_ERROR, "ENGINE: engine %s not available [%s]",
816 			   engine_id, ERR_error_string(ERR_get_error(), NULL));
817 		goto err;
818 	}
819 	if (ENGINE_init(conn->engine) != 1) {
820 		wpa_printf(MSG_ERROR, "ENGINE: engine init failed "
821 			   "(engine: %s) [%s]", engine_id,
822 			   ERR_error_string(ERR_get_error(), NULL));
823 		goto err;
824 	}
825 	wpa_printf(MSG_DEBUG, "ENGINE: engine initialized");
826 
827 	if (ENGINE_ctrl_cmd_string(conn->engine, "PIN", pin, 0) == 0) {
828 		wpa_printf(MSG_ERROR, "ENGINE: cannot set pin [%s]",
829 			   ERR_error_string(ERR_get_error(), NULL));
830 		goto err;
831 	}
832 	/* load private key first in-case PIN is required for cert */
833 	conn->private_key = ENGINE_load_private_key(conn->engine,
834 						    key_id, NULL, NULL);
835 	if (!conn->private_key) {
836 		wpa_printf(MSG_ERROR, "ENGINE: cannot load private key with id"
837 				" '%s' [%s]", key_id,
838 			   ERR_error_string(ERR_get_error(), NULL));
839 		ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
840 		goto err;
841 	}
842 
843 	/* handle a certificate and/or CA certificate */
844 	if (cert_id || ca_cert_id) {
845 		const char *cmd_name = "LOAD_CERT_CTRL";
846 
847 		/* test if the engine supports a LOAD_CERT_CTRL */
848 		if (!ENGINE_ctrl(conn->engine, ENGINE_CTRL_GET_CMD_FROM_NAME,
849 				 0, (void *)cmd_name, NULL)) {
850 			wpa_printf(MSG_ERROR, "ENGINE: engine does not support"
851 				   " loading certificates");
852 			ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
853 			goto err;
854 		}
855 	}
856 
857 	return 0;
858 
859 err:
860 	if (conn->engine) {
861 		ENGINE_free(conn->engine);
862 		conn->engine = NULL;
863 	}
864 
865 	if (conn->private_key) {
866 		EVP_PKEY_free(conn->private_key);
867 		conn->private_key = NULL;
868 	}
869 
870 	return ret;
871 #else /* OPENSSL_NO_ENGINE */
872 	return 0;
873 #endif /* OPENSSL_NO_ENGINE */
874 }
875 
876 
877 static void tls_engine_deinit(struct tls_connection *conn)
878 {
879 #ifndef OPENSSL_NO_ENGINE
880 	wpa_printf(MSG_DEBUG, "ENGINE: engine deinit");
881 	if (conn->private_key) {
882 		EVP_PKEY_free(conn->private_key);
883 		conn->private_key = NULL;
884 	}
885 	if (conn->engine) {
886 		ENGINE_finish(conn->engine);
887 		conn->engine = NULL;
888 	}
889 #endif /* OPENSSL_NO_ENGINE */
890 }
891 
892 
893 int tls_get_errors(void *ssl_ctx)
894 {
895 	int count = 0;
896 	unsigned long err;
897 
898 	while ((err = ERR_get_error())) {
899 		wpa_printf(MSG_INFO, "TLS - SSL error: %s",
900 			   ERR_error_string(err, NULL));
901 		count++;
902 	}
903 
904 	return count;
905 }
906 
907 struct tls_connection * tls_connection_init(void *ssl_ctx)
908 {
909 	SSL_CTX *ssl = ssl_ctx;
910 	struct tls_connection *conn;
911 	long options;
912 
913 	conn = os_zalloc(sizeof(*conn));
914 	if (conn == NULL)
915 		return NULL;
916 	conn->ssl = SSL_new(ssl);
917 	if (conn->ssl == NULL) {
918 		tls_show_errors(MSG_INFO, __func__,
919 				"Failed to initialize new SSL connection");
920 		os_free(conn);
921 		return NULL;
922 	}
923 
924 	SSL_set_app_data(conn->ssl, conn);
925 	options = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
926 		SSL_OP_SINGLE_DH_USE;
927 #ifdef SSL_OP_NO_COMPRESSION
928 	options |= SSL_OP_NO_COMPRESSION;
929 #endif /* SSL_OP_NO_COMPRESSION */
930 	SSL_set_options(conn->ssl, options);
931 
932 	conn->ssl_in = BIO_new(BIO_s_mem());
933 	if (!conn->ssl_in) {
934 		tls_show_errors(MSG_INFO, __func__,
935 				"Failed to create a new BIO for ssl_in");
936 		SSL_free(conn->ssl);
937 		os_free(conn);
938 		return NULL;
939 	}
940 
941 	conn->ssl_out = BIO_new(BIO_s_mem());
942 	if (!conn->ssl_out) {
943 		tls_show_errors(MSG_INFO, __func__,
944 				"Failed to create a new BIO for ssl_out");
945 		SSL_free(conn->ssl);
946 		BIO_free(conn->ssl_in);
947 		os_free(conn);
948 		return NULL;
949 	}
950 
951 	SSL_set_bio(conn->ssl, conn->ssl_in, conn->ssl_out);
952 
953 	return conn;
954 }
955 
956 
957 void tls_connection_deinit(void *ssl_ctx, struct tls_connection *conn)
958 {
959 	if (conn == NULL)
960 		return;
961 	SSL_free(conn->ssl);
962 	tls_engine_deinit(conn);
963 	os_free(conn->subject_match);
964 	os_free(conn->altsubject_match);
965 	os_free(conn->session_ticket);
966 	os_free(conn);
967 }
968 
969 
970 int tls_connection_established(void *ssl_ctx, struct tls_connection *conn)
971 {
972 	return conn ? SSL_is_init_finished(conn->ssl) : 0;
973 }
974 
975 
976 int tls_connection_shutdown(void *ssl_ctx, struct tls_connection *conn)
977 {
978 	if (conn == NULL)
979 		return -1;
980 
981 	/* Shutdown previous TLS connection without notifying the peer
982 	 * because the connection was already terminated in practice
983 	 * and "close notify" shutdown alert would confuse AS. */
984 	SSL_set_quiet_shutdown(conn->ssl, 1);
985 	SSL_shutdown(conn->ssl);
986 	return 0;
987 }
988 
989 
990 static int tls_match_altsubject_component(X509 *cert, int type,
991 					  const char *value, size_t len)
992 {
993 	GENERAL_NAME *gen;
994 	void *ext;
995 	int i, found = 0;
996 
997 	ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
998 
999 	for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
1000 		gen = sk_GENERAL_NAME_value(ext, i);
1001 		if (gen->type != type)
1002 			continue;
1003 		if (os_strlen((char *) gen->d.ia5->data) == len &&
1004 		    os_memcmp(value, gen->d.ia5->data, len) == 0)
1005 			found++;
1006 	}
1007 
1008 	return found;
1009 }
1010 
1011 
1012 static int tls_match_altsubject(X509 *cert, const char *match)
1013 {
1014 	int type;
1015 	const char *pos, *end;
1016 	size_t len;
1017 
1018 	pos = match;
1019 	do {
1020 		if (os_strncmp(pos, "EMAIL:", 6) == 0) {
1021 			type = GEN_EMAIL;
1022 			pos += 6;
1023 		} else if (os_strncmp(pos, "DNS:", 4) == 0) {
1024 			type = GEN_DNS;
1025 			pos += 4;
1026 		} else if (os_strncmp(pos, "URI:", 4) == 0) {
1027 			type = GEN_URI;
1028 			pos += 4;
1029 		} else {
1030 			wpa_printf(MSG_INFO, "TLS: Invalid altSubjectName "
1031 				   "match '%s'", pos);
1032 			return 0;
1033 		}
1034 		end = os_strchr(pos, ';');
1035 		while (end) {
1036 			if (os_strncmp(end + 1, "EMAIL:", 6) == 0 ||
1037 			    os_strncmp(end + 1, "DNS:", 4) == 0 ||
1038 			    os_strncmp(end + 1, "URI:", 4) == 0)
1039 				break;
1040 			end = os_strchr(end + 1, ';');
1041 		}
1042 		if (end)
1043 			len = end - pos;
1044 		else
1045 			len = os_strlen(pos);
1046 		if (tls_match_altsubject_component(cert, type, pos, len) > 0)
1047 			return 1;
1048 		pos = end + 1;
1049 	} while (end);
1050 
1051 	return 0;
1052 }
1053 
1054 
1055 static int tls_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
1056 {
1057 	char buf[256];
1058 	X509 *err_cert;
1059 	int err, depth;
1060 	SSL *ssl;
1061 	struct tls_connection *conn;
1062 	char *match, *altmatch;
1063 
1064 	err_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
1065 	err = X509_STORE_CTX_get_error(x509_ctx);
1066 	depth = X509_STORE_CTX_get_error_depth(x509_ctx);
1067 	ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
1068 					 SSL_get_ex_data_X509_STORE_CTX_idx());
1069 	X509_NAME_oneline(X509_get_subject_name(err_cert), buf, sizeof(buf));
1070 
1071 	conn = SSL_get_app_data(ssl);
1072 	match = conn ? conn->subject_match : NULL;
1073 	altmatch = conn ? conn->altsubject_match : NULL;
1074 
1075 	if (!preverify_ok) {
1076 		wpa_printf(MSG_WARNING, "TLS: Certificate verification failed,"
1077 			   " error %d (%s) depth %d for '%s'", err,
1078 			   X509_verify_cert_error_string(err), depth, buf);
1079 	} else {
1080 		wpa_printf(MSG_DEBUG, "TLS: tls_verify_cb - "
1081 			   "preverify_ok=%d err=%d (%s) depth=%d buf='%s'",
1082 			   preverify_ok, err,
1083 			   X509_verify_cert_error_string(err), depth, buf);
1084 		if (depth == 0 && match && os_strstr(buf, match) == NULL) {
1085 			wpa_printf(MSG_WARNING, "TLS: Subject '%s' did not "
1086 				   "match with '%s'", buf, match);
1087 			preverify_ok = 0;
1088 		} else if (depth == 0 && altmatch &&
1089 			   !tls_match_altsubject(err_cert, altmatch)) {
1090 			wpa_printf(MSG_WARNING, "TLS: altSubjectName match "
1091 				   "'%s' not found", altmatch);
1092 			preverify_ok = 0;
1093 		}
1094 	}
1095 
1096 	return preverify_ok;
1097 }
1098 
1099 
1100 #ifndef OPENSSL_NO_STDIO
1101 static int tls_load_ca_der(void *_ssl_ctx, const char *ca_cert)
1102 {
1103 	SSL_CTX *ssl_ctx = _ssl_ctx;
1104 	X509_LOOKUP *lookup;
1105 	int ret = 0;
1106 
1107 	lookup = X509_STORE_add_lookup(ssl_ctx->cert_store,
1108 				       X509_LOOKUP_file());
1109 	if (lookup == NULL) {
1110 		tls_show_errors(MSG_WARNING, __func__,
1111 				"Failed add lookup for X509 store");
1112 		return -1;
1113 	}
1114 
1115 	if (!X509_LOOKUP_load_file(lookup, ca_cert, X509_FILETYPE_ASN1)) {
1116 		unsigned long err = ERR_peek_error();
1117 		tls_show_errors(MSG_WARNING, __func__,
1118 				"Failed load CA in DER format");
1119 		if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1120 		    ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1121 			wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
1122 				   "cert already in hash table error",
1123 				   __func__);
1124 		} else
1125 			ret = -1;
1126 	}
1127 
1128 	return ret;
1129 }
1130 #endif /* OPENSSL_NO_STDIO */
1131 
1132 
1133 static int tls_connection_ca_cert(void *_ssl_ctx, struct tls_connection *conn,
1134 				  const char *ca_cert, const u8 *ca_cert_blob,
1135 				  size_t ca_cert_blob_len, const char *ca_path)
1136 {
1137 	SSL_CTX *ssl_ctx = _ssl_ctx;
1138 
1139 	/*
1140 	 * Remove previously configured trusted CA certificates before adding
1141 	 * new ones.
1142 	 */
1143 	X509_STORE_free(ssl_ctx->cert_store);
1144 	ssl_ctx->cert_store = X509_STORE_new();
1145 	if (ssl_ctx->cert_store == NULL) {
1146 		wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
1147 			   "certificate store", __func__);
1148 		return -1;
1149 	}
1150 
1151 	if (ca_cert_blob) {
1152 		X509 *cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &ca_cert_blob,
1153 				      ca_cert_blob_len);
1154 		if (cert == NULL) {
1155 			tls_show_errors(MSG_WARNING, __func__,
1156 					"Failed to parse ca_cert_blob");
1157 			return -1;
1158 		}
1159 
1160 		if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
1161 			unsigned long err = ERR_peek_error();
1162 			tls_show_errors(MSG_WARNING, __func__,
1163 					"Failed to add ca_cert_blob to "
1164 					"certificate store");
1165 			if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1166 			    ERR_GET_REASON(err) ==
1167 			    X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1168 				wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
1169 					   "cert already in hash table error",
1170 					   __func__);
1171 			} else {
1172 				X509_free(cert);
1173 				return -1;
1174 			}
1175 		}
1176 		X509_free(cert);
1177 		wpa_printf(MSG_DEBUG, "OpenSSL: %s - added ca_cert_blob "
1178 			   "to certificate store", __func__);
1179 		SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1180 		return 0;
1181 	}
1182 
1183 #ifdef CONFIG_NATIVE_WINDOWS
1184 	if (ca_cert && tls_cryptoapi_ca_cert(ssl_ctx, conn->ssl, ca_cert) ==
1185 	    0) {
1186 		wpa_printf(MSG_DEBUG, "OpenSSL: Added CA certificates from "
1187 			   "system certificate store");
1188 		SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1189 		return 0;
1190 	}
1191 #endif /* CONFIG_NATIVE_WINDOWS */
1192 
1193 	if (ca_cert || ca_path) {
1194 #ifndef OPENSSL_NO_STDIO
1195 		if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, ca_path) !=
1196 		    1) {
1197 			tls_show_errors(MSG_WARNING, __func__,
1198 					"Failed to load root certificates");
1199 			if (ca_cert &&
1200 			    tls_load_ca_der(ssl_ctx, ca_cert) == 0) {
1201 				wpa_printf(MSG_DEBUG, "OpenSSL: %s - loaded "
1202 					   "DER format CA certificate",
1203 					   __func__);
1204 			} else
1205 				return -1;
1206 		} else {
1207 			wpa_printf(MSG_DEBUG, "TLS: Trusted root "
1208 				   "certificate(s) loaded");
1209 			tls_get_errors(ssl_ctx);
1210 		}
1211 		SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1212 #else /* OPENSSL_NO_STDIO */
1213 		wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
1214 			   __func__);
1215 		return -1;
1216 #endif /* OPENSSL_NO_STDIO */
1217 	} else {
1218 		/* No ca_cert configured - do not try to verify server
1219 		 * certificate */
1220 		SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
1221 	}
1222 
1223 	return 0;
1224 }
1225 
1226 
1227 static int tls_global_ca_cert(SSL_CTX *ssl_ctx, const char *ca_cert)
1228 {
1229 	if (ca_cert) {
1230 		if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, NULL) != 1)
1231 		{
1232 			tls_show_errors(MSG_WARNING, __func__,
1233 					"Failed to load root certificates");
1234 			return -1;
1235 		}
1236 
1237 		wpa_printf(MSG_DEBUG, "TLS: Trusted root "
1238 			   "certificate(s) loaded");
1239 
1240 #ifndef OPENSSL_NO_STDIO
1241 		/* Add the same CAs to the client certificate requests */
1242 		SSL_CTX_set_client_CA_list(ssl_ctx,
1243 					   SSL_load_client_CA_file(ca_cert));
1244 #endif /* OPENSSL_NO_STDIO */
1245 	}
1246 
1247 	return 0;
1248 }
1249 
1250 
1251 int tls_global_set_verify(void *ssl_ctx, int check_crl)
1252 {
1253 	int flags;
1254 
1255 	if (check_crl) {
1256 		X509_STORE *cs = SSL_CTX_get_cert_store(ssl_ctx);
1257 		if (cs == NULL) {
1258 			tls_show_errors(MSG_INFO, __func__, "Failed to get "
1259 					"certificate store when enabling "
1260 					"check_crl");
1261 			return -1;
1262 		}
1263 		flags = X509_V_FLAG_CRL_CHECK;
1264 		if (check_crl == 2)
1265 			flags |= X509_V_FLAG_CRL_CHECK_ALL;
1266 		X509_STORE_set_flags(cs, flags);
1267 	}
1268 	return 0;
1269 }
1270 
1271 
1272 static int tls_connection_set_subject_match(struct tls_connection *conn,
1273 					    const char *subject_match,
1274 					    const char *altsubject_match)
1275 {
1276 	os_free(conn->subject_match);
1277 	conn->subject_match = NULL;
1278 	if (subject_match) {
1279 		conn->subject_match = os_strdup(subject_match);
1280 		if (conn->subject_match == NULL)
1281 			return -1;
1282 	}
1283 
1284 	os_free(conn->altsubject_match);
1285 	conn->altsubject_match = NULL;
1286 	if (altsubject_match) {
1287 		conn->altsubject_match = os_strdup(altsubject_match);
1288 		if (conn->altsubject_match == NULL)
1289 			return -1;
1290 	}
1291 
1292 	return 0;
1293 }
1294 
1295 
1296 int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
1297 			      int verify_peer)
1298 {
1299 	static int counter = 0;
1300 
1301 	if (conn == NULL)
1302 		return -1;
1303 
1304 	if (verify_peer) {
1305 		SSL_set_verify(conn->ssl, SSL_VERIFY_PEER |
1306 			       SSL_VERIFY_FAIL_IF_NO_PEER_CERT |
1307 			       SSL_VERIFY_CLIENT_ONCE, tls_verify_cb);
1308 	} else {
1309 		SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
1310 	}
1311 
1312 	SSL_set_accept_state(conn->ssl);
1313 
1314 	/*
1315 	 * Set session id context in order to avoid fatal errors when client
1316 	 * tries to resume a session. However, set the context to a unique
1317 	 * value in order to effectively disable session resumption for now
1318 	 * since not all areas of the server code are ready for it (e.g.,
1319 	 * EAP-TTLS needs special handling for Phase 2 after abbreviated TLS
1320 	 * handshake).
1321 	 */
1322 	counter++;
1323 	SSL_set_session_id_context(conn->ssl,
1324 				   (const unsigned char *) &counter,
1325 				   sizeof(counter));
1326 
1327 	return 0;
1328 }
1329 
1330 
1331 static int tls_connection_client_cert(struct tls_connection *conn,
1332 				      const char *client_cert,
1333 				      const u8 *client_cert_blob,
1334 				      size_t client_cert_blob_len)
1335 {
1336 	if (client_cert == NULL && client_cert_blob == NULL)
1337 		return 0;
1338 
1339 	if (client_cert_blob &&
1340 	    SSL_use_certificate_ASN1(conn->ssl, (u8 *) client_cert_blob,
1341 				     client_cert_blob_len) == 1) {
1342 		wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_ASN1 --> "
1343 			   "OK");
1344 		return 0;
1345 	} else if (client_cert_blob) {
1346 		tls_show_errors(MSG_DEBUG, __func__,
1347 				"SSL_use_certificate_ASN1 failed");
1348 	}
1349 
1350 	if (client_cert == NULL)
1351 		return -1;
1352 
1353 #ifndef OPENSSL_NO_STDIO
1354 	if (SSL_use_certificate_file(conn->ssl, client_cert,
1355 				     SSL_FILETYPE_ASN1) == 1) {
1356 		wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (DER)"
1357 			   " --> OK");
1358 		return 0;
1359 	} else {
1360 		tls_show_errors(MSG_DEBUG, __func__,
1361 				"SSL_use_certificate_file (DER) failed");
1362 	}
1363 
1364 	if (SSL_use_certificate_file(conn->ssl, client_cert,
1365 				     SSL_FILETYPE_PEM) == 1) {
1366 		wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (PEM)"
1367 			   " --> OK");
1368 		return 0;
1369 	} else {
1370 		tls_show_errors(MSG_DEBUG, __func__,
1371 				"SSL_use_certificate_file (PEM) failed");
1372 	}
1373 #else /* OPENSSL_NO_STDIO */
1374 	wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
1375 #endif /* OPENSSL_NO_STDIO */
1376 
1377 	return -1;
1378 }
1379 
1380 
1381 static int tls_global_client_cert(SSL_CTX *ssl_ctx, const char *client_cert)
1382 {
1383 #ifndef OPENSSL_NO_STDIO
1384 	if (client_cert == NULL)
1385 		return 0;
1386 
1387 	if (SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
1388 					 SSL_FILETYPE_ASN1) != 1 &&
1389 	    SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
1390 					 SSL_FILETYPE_PEM) != 1) {
1391 		tls_show_errors(MSG_INFO, __func__,
1392 				"Failed to load client certificate");
1393 		return -1;
1394 	}
1395 	return 0;
1396 #else /* OPENSSL_NO_STDIO */
1397 	if (client_cert == NULL)
1398 		return 0;
1399 	wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
1400 	return -1;
1401 #endif /* OPENSSL_NO_STDIO */
1402 }
1403 
1404 
1405 static int tls_passwd_cb(char *buf, int size, int rwflag, void *password)
1406 {
1407 	if (password == NULL) {
1408 		return 0;
1409 	}
1410 	os_strlcpy(buf, (char *) password, size);
1411 	return os_strlen(buf);
1412 }
1413 
1414 
1415 #ifdef PKCS12_FUNCS
1416 static int tls_parse_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, PKCS12 *p12,
1417 			    const char *passwd)
1418 {
1419 	EVP_PKEY *pkey;
1420 	X509 *cert;
1421 	STACK_OF(X509) *certs;
1422 	int res = 0;
1423 	char buf[256];
1424 
1425 	pkey = NULL;
1426 	cert = NULL;
1427 	certs = NULL;
1428 	if (!PKCS12_parse(p12, passwd, &pkey, &cert, &certs)) {
1429 		tls_show_errors(MSG_DEBUG, __func__,
1430 				"Failed to parse PKCS12 file");
1431 		PKCS12_free(p12);
1432 		return -1;
1433 	}
1434 	wpa_printf(MSG_DEBUG, "TLS: Successfully parsed PKCS12 data");
1435 
1436 	if (cert) {
1437 		X509_NAME_oneline(X509_get_subject_name(cert), buf,
1438 				  sizeof(buf));
1439 		wpa_printf(MSG_DEBUG, "TLS: Got certificate from PKCS12: "
1440 			   "subject='%s'", buf);
1441 		if (ssl) {
1442 			if (SSL_use_certificate(ssl, cert) != 1)
1443 				res = -1;
1444 		} else {
1445 			if (SSL_CTX_use_certificate(ssl_ctx, cert) != 1)
1446 				res = -1;
1447 		}
1448 		X509_free(cert);
1449 	}
1450 
1451 	if (pkey) {
1452 		wpa_printf(MSG_DEBUG, "TLS: Got private key from PKCS12");
1453 		if (ssl) {
1454 			if (SSL_use_PrivateKey(ssl, pkey) != 1)
1455 				res = -1;
1456 		} else {
1457 			if (SSL_CTX_use_PrivateKey(ssl_ctx, pkey) != 1)
1458 				res = -1;
1459 		}
1460 		EVP_PKEY_free(pkey);
1461 	}
1462 
1463 	if (certs) {
1464 		while ((cert = sk_X509_pop(certs)) != NULL) {
1465 			X509_NAME_oneline(X509_get_subject_name(cert), buf,
1466 					  sizeof(buf));
1467 			wpa_printf(MSG_DEBUG, "TLS: additional certificate"
1468 				   " from PKCS12: subject='%s'", buf);
1469 			/*
1470 			 * There is no SSL equivalent for the chain cert - so
1471 			 * always add it to the context...
1472 			 */
1473 			if (SSL_CTX_add_extra_chain_cert(ssl_ctx, cert) != 1) {
1474 				res = -1;
1475 				break;
1476 			}
1477 		}
1478 		sk_X509_free(certs);
1479 	}
1480 
1481 	PKCS12_free(p12);
1482 
1483 	if (res < 0)
1484 		tls_get_errors(ssl_ctx);
1485 
1486 	return res;
1487 }
1488 #endif  /* PKCS12_FUNCS */
1489 
1490 
1491 static int tls_read_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, const char *private_key,
1492 			   const char *passwd)
1493 {
1494 #ifdef PKCS12_FUNCS
1495 	FILE *f;
1496 	PKCS12 *p12;
1497 
1498 	f = fopen(private_key, "rb");
1499 	if (f == NULL)
1500 		return -1;
1501 
1502 	p12 = d2i_PKCS12_fp(f, NULL);
1503 	fclose(f);
1504 
1505 	if (p12 == NULL) {
1506 		tls_show_errors(MSG_INFO, __func__,
1507 				"Failed to use PKCS#12 file");
1508 		return -1;
1509 	}
1510 
1511 	return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);
1512 
1513 #else /* PKCS12_FUNCS */
1514 	wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot read "
1515 		   "p12/pfx files");
1516 	return -1;
1517 #endif  /* PKCS12_FUNCS */
1518 }
1519 
1520 
1521 static int tls_read_pkcs12_blob(SSL_CTX *ssl_ctx, SSL *ssl,
1522 				const u8 *blob, size_t len, const char *passwd)
1523 {
1524 #ifdef PKCS12_FUNCS
1525 	PKCS12 *p12;
1526 
1527 	p12 = d2i_PKCS12(NULL, (OPENSSL_d2i_TYPE) &blob, len);
1528 	if (p12 == NULL) {
1529 		tls_show_errors(MSG_INFO, __func__,
1530 				"Failed to use PKCS#12 blob");
1531 		return -1;
1532 	}
1533 
1534 	return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);
1535 
1536 #else /* PKCS12_FUNCS */
1537 	wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot parse "
1538 		   "p12/pfx blobs");
1539 	return -1;
1540 #endif  /* PKCS12_FUNCS */
1541 }
1542 
1543 
1544 #ifndef OPENSSL_NO_ENGINE
1545 static int tls_engine_get_cert(struct tls_connection *conn,
1546 			       const char *cert_id,
1547 			       X509 **cert)
1548 {
1549 	/* this runs after the private key is loaded so no PIN is required */
1550 	struct {
1551 		const char *cert_id;
1552 		X509 *cert;
1553 	} params;
1554 	params.cert_id = cert_id;
1555 	params.cert = NULL;
1556 
1557 	if (!ENGINE_ctrl_cmd(conn->engine, "LOAD_CERT_CTRL",
1558 			     0, &params, NULL, 1)) {
1559 		wpa_printf(MSG_ERROR, "ENGINE: cannot load client cert with id"
1560 			   " '%s' [%s]", cert_id,
1561 			   ERR_error_string(ERR_get_error(), NULL));
1562 		return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1563 	}
1564 	if (!params.cert) {
1565 		wpa_printf(MSG_ERROR, "ENGINE: did not properly cert with id"
1566 			   " '%s'", cert_id);
1567 		return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1568 	}
1569 	*cert = params.cert;
1570 	return 0;
1571 }
1572 #endif /* OPENSSL_NO_ENGINE */
1573 
1574 
1575 static int tls_connection_engine_client_cert(struct tls_connection *conn,
1576 					     const char *cert_id)
1577 {
1578 #ifndef OPENSSL_NO_ENGINE
1579 	X509 *cert;
1580 
1581 	if (tls_engine_get_cert(conn, cert_id, &cert))
1582 		return -1;
1583 
1584 	if (!SSL_use_certificate(conn->ssl, cert)) {
1585 		tls_show_errors(MSG_ERROR, __func__,
1586 				"SSL_use_certificate failed");
1587                 X509_free(cert);
1588 		return -1;
1589 	}
1590 	X509_free(cert);
1591 	wpa_printf(MSG_DEBUG, "ENGINE: SSL_use_certificate --> "
1592 		   "OK");
1593 	return 0;
1594 
1595 #else /* OPENSSL_NO_ENGINE */
1596 	return -1;
1597 #endif /* OPENSSL_NO_ENGINE */
1598 }
1599 
1600 
1601 static int tls_connection_engine_ca_cert(void *_ssl_ctx,
1602 					 struct tls_connection *conn,
1603 					 const char *ca_cert_id)
1604 {
1605 #ifndef OPENSSL_NO_ENGINE
1606 	X509 *cert;
1607 	SSL_CTX *ssl_ctx = _ssl_ctx;
1608 
1609 	if (tls_engine_get_cert(conn, ca_cert_id, &cert))
1610 		return -1;
1611 
1612 	/* start off the same as tls_connection_ca_cert */
1613 	X509_STORE_free(ssl_ctx->cert_store);
1614 	ssl_ctx->cert_store = X509_STORE_new();
1615 	if (ssl_ctx->cert_store == NULL) {
1616 		wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
1617 			   "certificate store", __func__);
1618 		X509_free(cert);
1619 		return -1;
1620 	}
1621 	if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
1622 		unsigned long err = ERR_peek_error();
1623 		tls_show_errors(MSG_WARNING, __func__,
1624 				"Failed to add CA certificate from engine "
1625 				"to certificate store");
1626 		if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1627 		    ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1628 			wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring cert"
1629 				   " already in hash table error",
1630 				   __func__);
1631 		} else {
1632 			X509_free(cert);
1633 			return -1;
1634 		}
1635 	}
1636 	X509_free(cert);
1637 	wpa_printf(MSG_DEBUG, "OpenSSL: %s - added CA certificate from engine "
1638 		   "to certificate store", __func__);
1639 	SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1640 	return 0;
1641 
1642 #else /* OPENSSL_NO_ENGINE */
1643 	return -1;
1644 #endif /* OPENSSL_NO_ENGINE */
1645 }
1646 
1647 
1648 static int tls_connection_engine_private_key(struct tls_connection *conn)
1649 {
1650 #ifndef OPENSSL_NO_ENGINE
1651 	if (SSL_use_PrivateKey(conn->ssl, conn->private_key) != 1) {
1652 		tls_show_errors(MSG_ERROR, __func__,
1653 				"ENGINE: cannot use private key for TLS");
1654 		return -1;
1655 	}
1656 	if (!SSL_check_private_key(conn->ssl)) {
1657 		tls_show_errors(MSG_INFO, __func__,
1658 				"Private key failed verification");
1659 		return -1;
1660 	}
1661 	return 0;
1662 #else /* OPENSSL_NO_ENGINE */
1663 	wpa_printf(MSG_ERROR, "SSL: Configuration uses engine, but "
1664 		   "engine support was not compiled in");
1665 	return -1;
1666 #endif /* OPENSSL_NO_ENGINE */
1667 }
1668 
1669 
1670 static int tls_connection_private_key(void *_ssl_ctx,
1671 				      struct tls_connection *conn,
1672 				      const char *private_key,
1673 				      const char *private_key_passwd,
1674 				      const u8 *private_key_blob,
1675 				      size_t private_key_blob_len)
1676 {
1677 	SSL_CTX *ssl_ctx = _ssl_ctx;
1678 	char *passwd;
1679 	int ok;
1680 
1681 	if (private_key == NULL && private_key_blob == NULL)
1682 		return 0;
1683 
1684 	if (private_key_passwd) {
1685 		passwd = os_strdup(private_key_passwd);
1686 		if (passwd == NULL)
1687 			return -1;
1688 	} else
1689 		passwd = NULL;
1690 
1691 	SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
1692 	SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
1693 
1694 	ok = 0;
1695 	while (private_key_blob) {
1696 		if (SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA, conn->ssl,
1697 					    (u8 *) private_key_blob,
1698 					    private_key_blob_len) == 1) {
1699 			wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
1700 				   "ASN1(EVP_PKEY_RSA) --> OK");
1701 			ok = 1;
1702 			break;
1703 		} else {
1704 			tls_show_errors(MSG_DEBUG, __func__,
1705 					"SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA)"
1706 					" failed");
1707 		}
1708 
1709 		if (SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA, conn->ssl,
1710 					    (u8 *) private_key_blob,
1711 					    private_key_blob_len) == 1) {
1712 			wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
1713 				   "ASN1(EVP_PKEY_DSA) --> OK");
1714 			ok = 1;
1715 			break;
1716 		} else {
1717 			tls_show_errors(MSG_DEBUG, __func__,
1718 					"SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA)"
1719 					" failed");
1720 		}
1721 
1722 		if (SSL_use_RSAPrivateKey_ASN1(conn->ssl,
1723 					       (u8 *) private_key_blob,
1724 					       private_key_blob_len) == 1) {
1725 			wpa_printf(MSG_DEBUG, "OpenSSL: "
1726 				   "SSL_use_RSAPrivateKey_ASN1 --> OK");
1727 			ok = 1;
1728 			break;
1729 		} else {
1730 			tls_show_errors(MSG_DEBUG, __func__,
1731 					"SSL_use_RSAPrivateKey_ASN1 failed");
1732 		}
1733 
1734 		if (tls_read_pkcs12_blob(ssl_ctx, conn->ssl, private_key_blob,
1735 					 private_key_blob_len, passwd) == 0) {
1736 			wpa_printf(MSG_DEBUG, "OpenSSL: PKCS#12 as blob --> "
1737 				   "OK");
1738 			ok = 1;
1739 			break;
1740 		}
1741 
1742 		break;
1743 	}
1744 
1745 	while (!ok && private_key) {
1746 #ifndef OPENSSL_NO_STDIO
1747 		if (SSL_use_PrivateKey_file(conn->ssl, private_key,
1748 					    SSL_FILETYPE_ASN1) == 1) {
1749 			wpa_printf(MSG_DEBUG, "OpenSSL: "
1750 				   "SSL_use_PrivateKey_File (DER) --> OK");
1751 			ok = 1;
1752 			break;
1753 		} else {
1754 			tls_show_errors(MSG_DEBUG, __func__,
1755 					"SSL_use_PrivateKey_File (DER) "
1756 					"failed");
1757 		}
1758 
1759 		if (SSL_use_PrivateKey_file(conn->ssl, private_key,
1760 					    SSL_FILETYPE_PEM) == 1) {
1761 			wpa_printf(MSG_DEBUG, "OpenSSL: "
1762 				   "SSL_use_PrivateKey_File (PEM) --> OK");
1763 			ok = 1;
1764 			break;
1765 		} else {
1766 			tls_show_errors(MSG_DEBUG, __func__,
1767 					"SSL_use_PrivateKey_File (PEM) "
1768 					"failed");
1769 		}
1770 #else /* OPENSSL_NO_STDIO */
1771 		wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
1772 			   __func__);
1773 #endif /* OPENSSL_NO_STDIO */
1774 
1775 		if (tls_read_pkcs12(ssl_ctx, conn->ssl, private_key, passwd)
1776 		    == 0) {
1777 			wpa_printf(MSG_DEBUG, "OpenSSL: Reading PKCS#12 file "
1778 				   "--> OK");
1779 			ok = 1;
1780 			break;
1781 		}
1782 
1783 		if (tls_cryptoapi_cert(conn->ssl, private_key) == 0) {
1784 			wpa_printf(MSG_DEBUG, "OpenSSL: Using CryptoAPI to "
1785 				   "access certificate store --> OK");
1786 			ok = 1;
1787 			break;
1788 		}
1789 
1790 		break;
1791 	}
1792 
1793 	if (!ok) {
1794 		wpa_printf(MSG_INFO, "OpenSSL: Failed to load private key");
1795 		os_free(passwd);
1796 		ERR_clear_error();
1797 		return -1;
1798 	}
1799 	ERR_clear_error();
1800 	SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
1801 	os_free(passwd);
1802 
1803 	if (!SSL_check_private_key(conn->ssl)) {
1804 		tls_show_errors(MSG_INFO, __func__, "Private key failed "
1805 				"verification");
1806 		return -1;
1807 	}
1808 
1809 	wpa_printf(MSG_DEBUG, "SSL: Private key loaded successfully");
1810 	return 0;
1811 }
1812 
1813 
1814 static int tls_global_private_key(SSL_CTX *ssl_ctx, const char *private_key,
1815 				  const char *private_key_passwd)
1816 {
1817 	char *passwd;
1818 
1819 	if (private_key == NULL)
1820 		return 0;
1821 
1822 	if (private_key_passwd) {
1823 		passwd = os_strdup(private_key_passwd);
1824 		if (passwd == NULL)
1825 			return -1;
1826 	} else
1827 		passwd = NULL;
1828 
1829 	SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
1830 	SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
1831 	if (
1832 #ifndef OPENSSL_NO_STDIO
1833 	    SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
1834 					SSL_FILETYPE_ASN1) != 1 &&
1835 	    SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
1836 					SSL_FILETYPE_PEM) != 1 &&
1837 #endif /* OPENSSL_NO_STDIO */
1838 	    tls_read_pkcs12(ssl_ctx, NULL, private_key, passwd)) {
1839 		tls_show_errors(MSG_INFO, __func__,
1840 				"Failed to load private key");
1841 		os_free(passwd);
1842 		ERR_clear_error();
1843 		return -1;
1844 	}
1845 	os_free(passwd);
1846 	ERR_clear_error();
1847 	SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
1848 
1849 	if (!SSL_CTX_check_private_key(ssl_ctx)) {
1850 		tls_show_errors(MSG_INFO, __func__,
1851 				"Private key failed verification");
1852 		return -1;
1853 	}
1854 
1855 	return 0;
1856 }
1857 
1858 
1859 static int tls_connection_dh(struct tls_connection *conn, const char *dh_file)
1860 {
1861 #ifdef OPENSSL_NO_DH
1862 	if (dh_file == NULL)
1863 		return 0;
1864 	wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
1865 		   "dh_file specified");
1866 	return -1;
1867 #else /* OPENSSL_NO_DH */
1868 	DH *dh;
1869 	BIO *bio;
1870 
1871 	/* TODO: add support for dh_blob */
1872 	if (dh_file == NULL)
1873 		return 0;
1874 	if (conn == NULL)
1875 		return -1;
1876 
1877 	bio = BIO_new_file(dh_file, "r");
1878 	if (bio == NULL) {
1879 		wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
1880 			   dh_file, ERR_error_string(ERR_get_error(), NULL));
1881 		return -1;
1882 	}
1883 	dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
1884 	BIO_free(bio);
1885 #ifndef OPENSSL_NO_DSA
1886 	while (dh == NULL) {
1887 		DSA *dsa;
1888 		wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
1889 			   " trying to parse as DSA params", dh_file,
1890 			   ERR_error_string(ERR_get_error(), NULL));
1891 		bio = BIO_new_file(dh_file, "r");
1892 		if (bio == NULL)
1893 			break;
1894 		dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
1895 		BIO_free(bio);
1896 		if (!dsa) {
1897 			wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
1898 				   "'%s': %s", dh_file,
1899 				   ERR_error_string(ERR_get_error(), NULL));
1900 			break;
1901 		}
1902 
1903 		wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
1904 		dh = DSA_dup_DH(dsa);
1905 		DSA_free(dsa);
1906 		if (dh == NULL) {
1907 			wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
1908 				   "params into DH params");
1909 			break;
1910 		}
1911 		break;
1912 	}
1913 #endif /* !OPENSSL_NO_DSA */
1914 	if (dh == NULL) {
1915 		wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
1916 			   "'%s'", dh_file);
1917 		return -1;
1918 	}
1919 
1920 	if (SSL_set_tmp_dh(conn->ssl, dh) != 1) {
1921 		wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
1922 			   "%s", dh_file,
1923 			   ERR_error_string(ERR_get_error(), NULL));
1924 		DH_free(dh);
1925 		return -1;
1926 	}
1927 	DH_free(dh);
1928 	return 0;
1929 #endif /* OPENSSL_NO_DH */
1930 }
1931 
1932 
1933 static int tls_global_dh(SSL_CTX *ssl_ctx, const char *dh_file)
1934 {
1935 #ifdef OPENSSL_NO_DH
1936 	if (dh_file == NULL)
1937 		return 0;
1938 	wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
1939 		   "dh_file specified");
1940 	return -1;
1941 #else /* OPENSSL_NO_DH */
1942 	DH *dh;
1943 	BIO *bio;
1944 
1945 	/* TODO: add support for dh_blob */
1946 	if (dh_file == NULL)
1947 		return 0;
1948 	if (ssl_ctx == NULL)
1949 		return -1;
1950 
1951 	bio = BIO_new_file(dh_file, "r");
1952 	if (bio == NULL) {
1953 		wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
1954 			   dh_file, ERR_error_string(ERR_get_error(), NULL));
1955 		return -1;
1956 	}
1957 	dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
1958 	BIO_free(bio);
1959 #ifndef OPENSSL_NO_DSA
1960 	while (dh == NULL) {
1961 		DSA *dsa;
1962 		wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
1963 			   " trying to parse as DSA params", dh_file,
1964 			   ERR_error_string(ERR_get_error(), NULL));
1965 		bio = BIO_new_file(dh_file, "r");
1966 		if (bio == NULL)
1967 			break;
1968 		dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
1969 		BIO_free(bio);
1970 		if (!dsa) {
1971 			wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
1972 				   "'%s': %s", dh_file,
1973 				   ERR_error_string(ERR_get_error(), NULL));
1974 			break;
1975 		}
1976 
1977 		wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
1978 		dh = DSA_dup_DH(dsa);
1979 		DSA_free(dsa);
1980 		if (dh == NULL) {
1981 			wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
1982 				   "params into DH params");
1983 			break;
1984 		}
1985 		break;
1986 	}
1987 #endif /* !OPENSSL_NO_DSA */
1988 	if (dh == NULL) {
1989 		wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
1990 			   "'%s'", dh_file);
1991 		return -1;
1992 	}
1993 
1994 	if (SSL_CTX_set_tmp_dh(ssl_ctx, dh) != 1) {
1995 		wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
1996 			   "%s", dh_file,
1997 			   ERR_error_string(ERR_get_error(), NULL));
1998 		DH_free(dh);
1999 		return -1;
2000 	}
2001 	DH_free(dh);
2002 	return 0;
2003 #endif /* OPENSSL_NO_DH */
2004 }
2005 
2006 
2007 int tls_connection_get_keys(void *ssl_ctx, struct tls_connection *conn,
2008 			    struct tls_keys *keys)
2009 {
2010 	SSL *ssl;
2011 
2012 	if (conn == NULL || keys == NULL)
2013 		return -1;
2014 	ssl = conn->ssl;
2015 	if (ssl == NULL || ssl->s3 == NULL || ssl->session == NULL)
2016 		return -1;
2017 
2018 	os_memset(keys, 0, sizeof(*keys));
2019 	keys->master_key = ssl->session->master_key;
2020 	keys->master_key_len = ssl->session->master_key_length;
2021 	keys->client_random = ssl->s3->client_random;
2022 	keys->client_random_len = SSL3_RANDOM_SIZE;
2023 	keys->server_random = ssl->s3->server_random;
2024 	keys->server_random_len = SSL3_RANDOM_SIZE;
2025 
2026 	return 0;
2027 }
2028 
2029 
2030 int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
2031 		       const char *label, int server_random_first,
2032 		       u8 *out, size_t out_len)
2033 {
2034 	return -1;
2035 }
2036 
2037 
2038 u8 * tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
2039 			      const u8 *in_data, size_t in_len,
2040 			      size_t *out_len, u8 **appl_data,
2041 			      size_t *appl_data_len)
2042 {
2043 	int res;
2044 	u8 *out_data;
2045 
2046 	if (appl_data)
2047 		*appl_data = NULL;
2048 
2049 	/*
2050 	 * Give TLS handshake data from the server (if available) to OpenSSL
2051 	 * for processing.
2052 	 */
2053 	if (in_data &&
2054 	    BIO_write(conn->ssl_in, in_data, in_len) < 0) {
2055 		tls_show_errors(MSG_INFO, __func__,
2056 				"Handshake failed - BIO_write");
2057 		return NULL;
2058 	}
2059 
2060 	/* Initiate TLS handshake or continue the existing handshake */
2061 	res = SSL_connect(conn->ssl);
2062 	if (res != 1) {
2063 		int err = SSL_get_error(conn->ssl, res);
2064 		if (err == SSL_ERROR_WANT_READ)
2065 			wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want "
2066 				   "more data");
2067 		else if (err == SSL_ERROR_WANT_WRITE)
2068 			wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want to "
2069 				   "write");
2070 		else {
2071 			tls_show_errors(MSG_INFO, __func__, "SSL_connect");
2072 			conn->failed++;
2073 		}
2074 	}
2075 
2076 	/* Get the TLS handshake data to be sent to the server */
2077 	res = BIO_ctrl_pending(conn->ssl_out);
2078 	wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
2079 	out_data = os_malloc(res == 0 ? 1 : res);
2080 	if (out_data == NULL) {
2081 		wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
2082 			   "handshake output (%d bytes)", res);
2083 		if (BIO_reset(conn->ssl_out) < 0) {
2084 			tls_show_errors(MSG_INFO, __func__,
2085 					"BIO_reset failed");
2086 		}
2087 		*out_len = 0;
2088 		return NULL;
2089 	}
2090 	res = res == 0 ? 0 : BIO_read(conn->ssl_out, out_data, res);
2091 	if (res < 0) {
2092 		tls_show_errors(MSG_INFO, __func__,
2093 				"Handshake failed - BIO_read");
2094 		if (BIO_reset(conn->ssl_out) < 0) {
2095 			tls_show_errors(MSG_INFO, __func__,
2096 					"BIO_reset failed");
2097 		}
2098 		*out_len = 0;
2099 		return NULL;
2100 	}
2101 	*out_len = res;
2102 
2103 	if (SSL_is_init_finished(conn->ssl) && appl_data) {
2104 		*appl_data = os_malloc(in_len);
2105 		if (*appl_data) {
2106 			res = SSL_read(conn->ssl, *appl_data, in_len);
2107 			if (res < 0) {
2108 				tls_show_errors(MSG_INFO, __func__,
2109 						"Failed to read possible "
2110 						"Application Data");
2111 				os_free(*appl_data);
2112 				*appl_data = NULL;
2113 			} else {
2114 				*appl_data_len = res;
2115 				wpa_hexdump_key(MSG_MSGDUMP, "SSL: Application"
2116 						" Data in Finish message",
2117 						*appl_data, *appl_data_len);
2118 			}
2119 		}
2120 	}
2121 
2122 	return out_data;
2123 }
2124 
2125 
2126 u8 * tls_connection_server_handshake(void *ssl_ctx,
2127 				     struct tls_connection *conn,
2128 				     const u8 *in_data, size_t in_len,
2129 				     size_t *out_len)
2130 {
2131 	int res;
2132 	u8 *out_data;
2133 
2134 	/*
2135 	 * Give TLS handshake data from the client (if available) to OpenSSL
2136 	 * for processing.
2137 	 */
2138 	if (in_data &&
2139 	    BIO_write(conn->ssl_in, in_data, in_len) < 0) {
2140 		tls_show_errors(MSG_INFO, __func__,
2141 				"Handshake failed - BIO_write");
2142 		return NULL;
2143 	}
2144 
2145 	/* Initiate TLS handshake or continue the existing handshake */
2146 	res = SSL_accept(conn->ssl);
2147 	if (res != 1) {
2148 		int err = SSL_get_error(conn->ssl, res);
2149 		if (err == SSL_ERROR_WANT_READ)
2150 			wpa_printf(MSG_DEBUG, "SSL: SSL_accept - want "
2151 				   "more data");
2152 		else if (err == SSL_ERROR_WANT_WRITE)
2153 			wpa_printf(MSG_DEBUG, "SSL: SSL_accept - want to "
2154 				   "write");
2155 		else {
2156 			tls_show_errors(MSG_INFO, __func__, "SSL_accept");
2157 			return NULL;
2158 		}
2159 	}
2160 
2161 	/* Get the TLS handshake data to be sent to the client */
2162 	res = BIO_ctrl_pending(conn->ssl_out);
2163 	wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
2164 	out_data = os_malloc(res == 0 ? 1 : res);
2165 	if (out_data == NULL) {
2166 		wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
2167 			   "handshake output (%d bytes)", res);
2168 		if (BIO_reset(conn->ssl_out) < 0) {
2169 			tls_show_errors(MSG_INFO, __func__,
2170 					"BIO_reset failed");
2171 		}
2172 		*out_len = 0;
2173 		return NULL;
2174 	}
2175 	res = res == 0 ? 0 : BIO_read(conn->ssl_out, out_data, res);
2176 	if (res < 0) {
2177 		tls_show_errors(MSG_INFO, __func__,
2178 				"Handshake failed - BIO_read");
2179 		if (BIO_reset(conn->ssl_out) < 0) {
2180 			tls_show_errors(MSG_INFO, __func__,
2181 					"BIO_reset failed");
2182 		}
2183 		*out_len = 0;
2184 		return NULL;
2185 	}
2186 	*out_len = res;
2187 	return out_data;
2188 }
2189 
2190 
2191 int tls_connection_encrypt(void *ssl_ctx, struct tls_connection *conn,
2192 			   const u8 *in_data, size_t in_len,
2193 			   u8 *out_data, size_t out_len)
2194 {
2195 	int res;
2196 
2197 	if (conn == NULL)
2198 		return -1;
2199 
2200 	/* Give plaintext data for OpenSSL to encrypt into the TLS tunnel. */
2201 	if ((res = BIO_reset(conn->ssl_in)) < 0 ||
2202 	    (res = BIO_reset(conn->ssl_out)) < 0) {
2203 		tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
2204 		return res;
2205 	}
2206 	res = SSL_write(conn->ssl, in_data, in_len);
2207 	if (res < 0) {
2208 		tls_show_errors(MSG_INFO, __func__,
2209 				"Encryption failed - SSL_write");
2210 		return res;
2211 	}
2212 
2213 	/* Read encrypted data to be sent to the server */
2214 	res = BIO_read(conn->ssl_out, out_data, out_len);
2215 	if (res < 0) {
2216 		tls_show_errors(MSG_INFO, __func__,
2217 				"Encryption failed - BIO_read");
2218 		return res;
2219 	}
2220 
2221 	return res;
2222 }
2223 
2224 
2225 int tls_connection_decrypt(void *ssl_ctx, struct tls_connection *conn,
2226 			   const u8 *in_data, size_t in_len,
2227 			   u8 *out_data, size_t out_len)
2228 {
2229 	int res;
2230 
2231 	/* Give encrypted data from TLS tunnel for OpenSSL to decrypt. */
2232 	res = BIO_write(conn->ssl_in, in_data, in_len);
2233 	if (res < 0) {
2234 		tls_show_errors(MSG_INFO, __func__,
2235 				"Decryption failed - BIO_write");
2236 		return res;
2237 	}
2238 	if (BIO_reset(conn->ssl_out) < 0) {
2239 		tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
2240 		return res;
2241 	}
2242 
2243 	/* Read decrypted data for further processing */
2244 	res = SSL_read(conn->ssl, out_data, out_len);
2245 	if (res < 0) {
2246 		tls_show_errors(MSG_INFO, __func__,
2247 				"Decryption failed - SSL_read");
2248 		return res;
2249 	}
2250 
2251 	return res;
2252 }
2253 
2254 
2255 int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn)
2256 {
2257 	return conn ? conn->ssl->hit : 0;
2258 }
2259 
2260 
2261 int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
2262 				   u8 *ciphers)
2263 {
2264 	char buf[100], *pos, *end;
2265 	u8 *c;
2266 	int ret;
2267 
2268 	if (conn == NULL || conn->ssl == NULL || ciphers == NULL)
2269 		return -1;
2270 
2271 	buf[0] = '\0';
2272 	pos = buf;
2273 	end = pos + sizeof(buf);
2274 
2275 	c = ciphers;
2276 	while (*c != TLS_CIPHER_NONE) {
2277 		const char *suite;
2278 
2279 		switch (*c) {
2280 		case TLS_CIPHER_RC4_SHA:
2281 			suite = "RC4-SHA";
2282 			break;
2283 		case TLS_CIPHER_AES128_SHA:
2284 			suite = "AES128-SHA";
2285 			break;
2286 		case TLS_CIPHER_RSA_DHE_AES128_SHA:
2287 			suite = "DHE-RSA-AES128-SHA";
2288 			break;
2289 		case TLS_CIPHER_ANON_DH_AES128_SHA:
2290 			suite = "ADH-AES128-SHA";
2291 			break;
2292 		default:
2293 			wpa_printf(MSG_DEBUG, "TLS: Unsupported "
2294 				   "cipher selection: %d", *c);
2295 			return -1;
2296 		}
2297 		ret = os_snprintf(pos, end - pos, ":%s", suite);
2298 		if (ret < 0 || ret >= end - pos)
2299 			break;
2300 		pos += ret;
2301 
2302 		c++;
2303 	}
2304 
2305 	wpa_printf(MSG_DEBUG, "OpenSSL: cipher suites: %s", buf + 1);
2306 
2307 	if (SSL_set_cipher_list(conn->ssl, buf + 1) != 1) {
2308 		tls_show_errors(MSG_INFO, __func__,
2309 				"Cipher suite configuration failed");
2310 		return -1;
2311 	}
2312 
2313 	return 0;
2314 }
2315 
2316 
2317 int tls_get_cipher(void *ssl_ctx, struct tls_connection *conn,
2318 		   char *buf, size_t buflen)
2319 {
2320 	const char *name;
2321 	if (conn == NULL || conn->ssl == NULL)
2322 		return -1;
2323 
2324 	name = SSL_get_cipher(conn->ssl);
2325 	if (name == NULL)
2326 		return -1;
2327 
2328 	os_strlcpy(buf, name, buflen);
2329 	return 0;
2330 }
2331 
2332 
2333 int tls_connection_enable_workaround(void *ssl_ctx,
2334 				     struct tls_connection *conn)
2335 {
2336 	SSL_set_options(conn->ssl, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);
2337 
2338 	return 0;
2339 }
2340 
2341 
2342 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC)
2343 /* ClientHello TLS extensions require a patch to openssl, so this function is
2344  * commented out unless explicitly needed for EAP-FAST in order to be able to
2345  * build this file with unmodified openssl. */
2346 int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn,
2347 				    int ext_type, const u8 *data,
2348 				    size_t data_len)
2349 {
2350 	if (conn == NULL || conn->ssl == NULL || ext_type != 35)
2351 		return -1;
2352 
2353 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
2354 	if (SSL_set_session_ticket_ext(conn->ssl, (void *) data,
2355 				       data_len) != 1)
2356 		return -1;
2357 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2358 	if (SSL_set_hello_extension(conn->ssl, ext_type, (void *) data,
2359 				    data_len) != 1)
2360 		return -1;
2361 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2362 
2363 	return 0;
2364 }
2365 #endif /* EAP_FAST || EAP_FAST_DYNAMIC */
2366 
2367 
2368 int tls_connection_get_failed(void *ssl_ctx, struct tls_connection *conn)
2369 {
2370 	if (conn == NULL)
2371 		return -1;
2372 	return conn->failed;
2373 }
2374 
2375 
2376 int tls_connection_get_read_alerts(void *ssl_ctx, struct tls_connection *conn)
2377 {
2378 	if (conn == NULL)
2379 		return -1;
2380 	return conn->read_alerts;
2381 }
2382 
2383 
2384 int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn)
2385 {
2386 	if (conn == NULL)
2387 		return -1;
2388 	return conn->write_alerts;
2389 }
2390 
2391 
2392 int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
2393 			      const struct tls_connection_params *params)
2394 {
2395 	int ret;
2396 	unsigned long err;
2397 
2398 	if (conn == NULL)
2399 		return -1;
2400 
2401 	while ((err = ERR_get_error())) {
2402 		wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
2403 			   __func__, ERR_error_string(err, NULL));
2404 	}
2405 
2406 	if (params->engine) {
2407 		wpa_printf(MSG_DEBUG, "SSL: Initializing TLS engine");
2408 		ret = tls_engine_init(conn, params->engine_id, params->pin,
2409 				      params->key_id, params->cert_id,
2410 				      params->ca_cert_id);
2411 		if (ret)
2412 			return ret;
2413 	}
2414 	if (tls_connection_set_subject_match(conn,
2415 					     params->subject_match,
2416 					     params->altsubject_match))
2417 		return -1;
2418 
2419 	if (params->engine && params->ca_cert_id) {
2420 		if (tls_connection_engine_ca_cert(tls_ctx, conn,
2421 						  params->ca_cert_id))
2422 			return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
2423 	} else if (tls_connection_ca_cert(tls_ctx, conn, params->ca_cert,
2424 					  params->ca_cert_blob,
2425 					  params->ca_cert_blob_len,
2426 					  params->ca_path))
2427 		return -1;
2428 
2429 	if (params->engine && params->cert_id) {
2430 		if (tls_connection_engine_client_cert(conn, params->cert_id))
2431 			return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
2432 	} else if (tls_connection_client_cert(conn, params->client_cert,
2433 					      params->client_cert_blob,
2434 					      params->client_cert_blob_len))
2435 		return -1;
2436 
2437 	if (params->engine && params->key_id) {
2438 		wpa_printf(MSG_DEBUG, "TLS: Using private key from engine");
2439 		if (tls_connection_engine_private_key(conn))
2440 			return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
2441 	} else if (tls_connection_private_key(tls_ctx, conn,
2442 					      params->private_key,
2443 					      params->private_key_passwd,
2444 					      params->private_key_blob,
2445 					      params->private_key_blob_len)) {
2446 		wpa_printf(MSG_INFO, "TLS: Failed to load private key '%s'",
2447 			   params->private_key);
2448 		return -1;
2449 	}
2450 
2451 	if (tls_connection_dh(conn, params->dh_file)) {
2452 		wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
2453 			   params->dh_file);
2454 		return -1;
2455 	}
2456 
2457 	tls_get_errors(tls_ctx);
2458 
2459 	return 0;
2460 }
2461 
2462 
2463 int tls_global_set_params(void *tls_ctx,
2464 			  const struct tls_connection_params *params)
2465 {
2466 	SSL_CTX *ssl_ctx = tls_ctx;
2467 	unsigned long err;
2468 
2469 	while ((err = ERR_get_error())) {
2470 		wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
2471 			   __func__, ERR_error_string(err, NULL));
2472 	}
2473 
2474 	if (tls_global_ca_cert(ssl_ctx, params->ca_cert))
2475 		return -1;
2476 
2477 	if (tls_global_client_cert(ssl_ctx, params->client_cert))
2478 		return -1;
2479 
2480 	if (tls_global_private_key(ssl_ctx, params->private_key,
2481 				   params->private_key_passwd))
2482 		return -1;
2483 
2484 	if (tls_global_dh(ssl_ctx, params->dh_file)) {
2485 		wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
2486 			   params->dh_file);
2487 		return -1;
2488 	}
2489 
2490 	return 0;
2491 }
2492 
2493 
2494 int tls_connection_get_keyblock_size(void *tls_ctx,
2495 				     struct tls_connection *conn)
2496 {
2497 	const EVP_CIPHER *c;
2498 	const EVP_MD *h;
2499 
2500 	if (conn == NULL || conn->ssl == NULL ||
2501 	    conn->ssl->enc_read_ctx == NULL ||
2502 	    conn->ssl->enc_read_ctx->cipher == NULL ||
2503 	    conn->ssl->read_hash == NULL)
2504 		return -1;
2505 
2506 	c = conn->ssl->enc_read_ctx->cipher;
2507 #if OPENSSL_VERSION_NUMBER >= 0x00909000L
2508 	h = EVP_MD_CTX_md(conn->ssl->read_hash);
2509 #else
2510 	h = conn->ssl->read_hash;
2511 #endif
2512 
2513 	return 2 * (EVP_CIPHER_key_length(c) +
2514 		    EVP_MD_size(h) +
2515 		    EVP_CIPHER_iv_length(c));
2516 }
2517 
2518 
2519 unsigned int tls_capabilities(void *tls_ctx)
2520 {
2521 	return 0;
2522 }
2523 
2524 
2525 int tls_connection_set_ia(void *tls_ctx, struct tls_connection *conn,
2526 			  int tls_ia)
2527 {
2528 	return -1;
2529 }
2530 
2531 
2532 int tls_connection_ia_send_phase_finished(void *tls_ctx,
2533 					  struct tls_connection *conn,
2534 					  int final,
2535 					  u8 *out_data, size_t out_len)
2536 {
2537 	return -1;
2538 }
2539 
2540 
2541 int tls_connection_ia_final_phase_finished(void *tls_ctx,
2542 					   struct tls_connection *conn)
2543 {
2544 	return -1;
2545 }
2546 
2547 
2548 int tls_connection_ia_permute_inner_secret(void *tls_ctx,
2549 					   struct tls_connection *conn,
2550 					   const u8 *key, size_t key_len)
2551 {
2552 	return -1;
2553 }
2554 
2555 
2556 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC)
2557 /* Pre-shared secred requires a patch to openssl, so this function is
2558  * commented out unless explicitly needed for EAP-FAST in order to be able to
2559  * build this file with unmodified openssl. */
2560 
2561 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
2562 			   STACK_OF(SSL_CIPHER) *peer_ciphers,
2563 			   SSL_CIPHER **cipher, void *arg)
2564 {
2565 	struct tls_connection *conn = arg;
2566 	int ret;
2567 
2568 	if (conn == NULL || conn->session_ticket_cb == NULL)
2569 		return 0;
2570 
2571 	ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
2572 				      conn->session_ticket,
2573 				      conn->session_ticket_len,
2574 				      s->s3->client_random,
2575 				      s->s3->server_random, secret);
2576 	os_free(conn->session_ticket);
2577 	conn->session_ticket = NULL;
2578 
2579 	if (ret <= 0)
2580 		return 0;
2581 
2582 	*secret_len = SSL_MAX_MASTER_KEY_LENGTH;
2583 	return 1;
2584 }
2585 
2586 
2587 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
2588 static int tls_session_ticket_ext_cb(SSL *s, const unsigned char *data,
2589 				     int len, void *arg)
2590 {
2591 	struct tls_connection *conn = arg;
2592 
2593 	if (conn == NULL || conn->session_ticket_cb == NULL)
2594 		return 0;
2595 
2596 	wpa_printf(MSG_DEBUG, "OpenSSL: %s: length=%d", __func__, len);
2597 
2598 	os_free(conn->session_ticket);
2599 	conn->session_ticket = NULL;
2600 
2601 	wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
2602 		    "extension", data, len);
2603 
2604 	conn->session_ticket = os_malloc(len);
2605 	if (conn->session_ticket == NULL)
2606 		return 0;
2607 
2608 	os_memcpy(conn->session_ticket, data, len);
2609 	conn->session_ticket_len = len;
2610 
2611 	return 1;
2612 }
2613 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2614 #ifdef SSL_OP_NO_TICKET
2615 static void tls_hello_ext_cb(SSL *s, int client_server, int type,
2616 			     unsigned char *data, int len, void *arg)
2617 {
2618 	struct tls_connection *conn = arg;
2619 
2620 	if (conn == NULL || conn->session_ticket_cb == NULL)
2621 		return;
2622 
2623 	wpa_printf(MSG_DEBUG, "OpenSSL: %s: type=%d length=%d", __func__,
2624 		   type, len);
2625 
2626 	if (type == TLSEXT_TYPE_session_ticket && !client_server) {
2627 		os_free(conn->session_ticket);
2628 		conn->session_ticket = NULL;
2629 
2630 		wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
2631 			    "extension", data, len);
2632 		conn->session_ticket = os_malloc(len);
2633 		if (conn->session_ticket == NULL)
2634 			return;
2635 
2636 		os_memcpy(conn->session_ticket, data, len);
2637 		conn->session_ticket_len = len;
2638 	}
2639 }
2640 #else /* SSL_OP_NO_TICKET */
2641 static int tls_hello_ext_cb(SSL *s, TLS_EXTENSION *ext, void *arg)
2642 {
2643 	struct tls_connection *conn = arg;
2644 
2645 	if (conn == NULL || conn->session_ticket_cb == NULL)
2646 		return 0;
2647 
2648 	wpa_printf(MSG_DEBUG, "OpenSSL: %s: type=%d length=%d", __func__,
2649 		   ext->type, ext->length);
2650 
2651 	os_free(conn->session_ticket);
2652 	conn->session_ticket = NULL;
2653 
2654 	if (ext->type == 35) {
2655 		wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
2656 			    "extension", ext->data, ext->length);
2657 		conn->session_ticket = os_malloc(ext->length);
2658 		if (conn->session_ticket == NULL)
2659 			return SSL_AD_INTERNAL_ERROR;
2660 
2661 		os_memcpy(conn->session_ticket, ext->data, ext->length);
2662 		conn->session_ticket_len = ext->length;
2663 	}
2664 
2665 	return 0;
2666 }
2667 #endif /* SSL_OP_NO_TICKET */
2668 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2669 #endif /* EAP_FAST || EAP_FAST_DYNAMIC */
2670 
2671 
2672 int tls_connection_set_session_ticket_cb(void *tls_ctx,
2673 					 struct tls_connection *conn,
2674 					 tls_session_ticket_cb cb,
2675 					 void *ctx)
2676 {
2677 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC)
2678 	conn->session_ticket_cb = cb;
2679 	conn->session_ticket_cb_ctx = ctx;
2680 
2681 	if (cb) {
2682 		if (SSL_set_session_secret_cb(conn->ssl, tls_sess_sec_cb,
2683 					      conn) != 1)
2684 			return -1;
2685 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
2686 		SSL_set_session_ticket_ext_cb(conn->ssl,
2687 					      tls_session_ticket_ext_cb, conn);
2688 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2689 #ifdef SSL_OP_NO_TICKET
2690 		SSL_set_tlsext_debug_callback(conn->ssl, tls_hello_ext_cb);
2691 		SSL_set_tlsext_debug_arg(conn->ssl, conn);
2692 #else /* SSL_OP_NO_TICKET */
2693 		if (SSL_set_hello_extension_cb(conn->ssl, tls_hello_ext_cb,
2694 					       conn) != 1)
2695 			return -1;
2696 #endif /* SSL_OP_NO_TICKET */
2697 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2698 	} else {
2699 		if (SSL_set_session_secret_cb(conn->ssl, NULL, NULL) != 1)
2700 			return -1;
2701 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
2702 		SSL_set_session_ticket_ext_cb(conn->ssl, NULL, NULL);
2703 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2704 #ifdef SSL_OP_NO_TICKET
2705 		SSL_set_tlsext_debug_callback(conn->ssl, NULL);
2706 		SSL_set_tlsext_debug_arg(conn->ssl, conn);
2707 #else /* SSL_OP_NO_TICKET */
2708 		if (SSL_set_hello_extension_cb(conn->ssl, NULL, NULL) != 1)
2709 			return -1;
2710 #endif /* SSL_OP_NO_TICKET */
2711 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2712 	}
2713 
2714 	return 0;
2715 #else /* EAP_FAST || EAP_FAST_DYNAMIC */
2716 	return -1;
2717 #endif /* EAP_FAST || EAP_FAST_DYNAMIC */
2718 }
2719