1 /*
2 * Copyright 1995-2022 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright 2005 Nokia. All rights reserved.
4 *
5 * Licensed under the Apache License 2.0 (the "License"). You may not use
6 * this file except in compliance with the License. You can obtain a copy
7 * in the file LICENSE in the source distribution or at
8 * https://www.openssl.org/source/license.html
9 */
10
11 #include <stdio.h>
12 #include "ssl_local.h"
13 #include "record/record_local.h"
14 #include "internal/ktls.h"
15 #include "internal/cryptlib.h"
16 #include <openssl/comp.h>
17 #include <openssl/evp.h>
18 #include <openssl/kdf.h>
19 #include <openssl/rand.h>
20 #include <openssl/obj_mac.h>
21 #include <openssl/core_names.h>
22 #include <openssl/trace.h>
23
24 /* seed1 through seed5 are concatenated */
tls1_PRF(SSL * s,const void * seed1,size_t seed1_len,const void * seed2,size_t seed2_len,const void * seed3,size_t seed3_len,const void * seed4,size_t seed4_len,const void * seed5,size_t seed5_len,const unsigned char * sec,size_t slen,unsigned char * out,size_t olen,int fatal)25 static int tls1_PRF(SSL *s,
26 const void *seed1, size_t seed1_len,
27 const void *seed2, size_t seed2_len,
28 const void *seed3, size_t seed3_len,
29 const void *seed4, size_t seed4_len,
30 const void *seed5, size_t seed5_len,
31 const unsigned char *sec, size_t slen,
32 unsigned char *out, size_t olen, int fatal)
33 {
34 const EVP_MD *md = ssl_prf_md(s);
35 EVP_KDF *kdf;
36 EVP_KDF_CTX *kctx = NULL;
37 OSSL_PARAM params[8], *p = params;
38 const char *mdname;
39
40 if (md == NULL) {
41 /* Should never happen */
42 if (fatal)
43 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
44 else
45 ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
46 return 0;
47 }
48 kdf = EVP_KDF_fetch(s->ctx->libctx, OSSL_KDF_NAME_TLS1_PRF, s->ctx->propq);
49 if (kdf == NULL)
50 goto err;
51 kctx = EVP_KDF_CTX_new(kdf);
52 EVP_KDF_free(kdf);
53 if (kctx == NULL)
54 goto err;
55 mdname = EVP_MD_get0_name(md);
56 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
57 (char *)mdname, 0);
58 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SECRET,
59 (unsigned char *)sec,
60 (size_t)slen);
61 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
62 (void *)seed1, (size_t)seed1_len);
63 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
64 (void *)seed2, (size_t)seed2_len);
65 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
66 (void *)seed3, (size_t)seed3_len);
67 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
68 (void *)seed4, (size_t)seed4_len);
69 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
70 (void *)seed5, (size_t)seed5_len);
71 *p = OSSL_PARAM_construct_end();
72 if (EVP_KDF_derive(kctx, out, olen, params)) {
73 EVP_KDF_CTX_free(kctx);
74 return 1;
75 }
76
77 err:
78 if (fatal)
79 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
80 else
81 ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
82 EVP_KDF_CTX_free(kctx);
83 return 0;
84 }
85
tls1_generate_key_block(SSL * s,unsigned char * km,size_t num)86 static int tls1_generate_key_block(SSL *s, unsigned char *km, size_t num)
87 {
88 int ret;
89
90 /* Calls SSLfatal() as required */
91 ret = tls1_PRF(s,
92 TLS_MD_KEY_EXPANSION_CONST,
93 TLS_MD_KEY_EXPANSION_CONST_SIZE, s->s3.server_random,
94 SSL3_RANDOM_SIZE, s->s3.client_random, SSL3_RANDOM_SIZE,
95 NULL, 0, NULL, 0, s->session->master_key,
96 s->session->master_key_length, km, num, 1);
97
98 return ret;
99 }
100
tls_provider_set_tls_params(SSL * s,EVP_CIPHER_CTX * ctx,const EVP_CIPHER * ciph,const EVP_MD * md)101 int tls_provider_set_tls_params(SSL *s, EVP_CIPHER_CTX *ctx,
102 const EVP_CIPHER *ciph,
103 const EVP_MD *md)
104 {
105 /*
106 * Provided cipher, the TLS padding/MAC removal is performed provider
107 * side so we need to tell the ctx about our TLS version and mac size
108 */
109 OSSL_PARAM params[3], *pprm = params;
110 size_t macsize = 0;
111 int imacsize = -1;
112
113 if ((EVP_CIPHER_get_flags(ciph) & EVP_CIPH_FLAG_AEAD_CIPHER) == 0
114 /*
115 * We look at s->ext.use_etm instead of SSL_READ_ETM() or
116 * SSL_WRITE_ETM() because this test applies to both reading
117 * and writing.
118 */
119 && !s->ext.use_etm)
120 imacsize = EVP_MD_get_size(md);
121 if (imacsize >= 0)
122 macsize = (size_t)imacsize;
123
124 *pprm++ = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_TLS_VERSION,
125 &s->version);
126 *pprm++ = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_TLS_MAC_SIZE,
127 &macsize);
128 *pprm = OSSL_PARAM_construct_end();
129
130 if (!EVP_CIPHER_CTX_set_params(ctx, params)) {
131 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
132 return 0;
133 }
134
135 return 1;
136 }
137
138
tls_iv_length_within_key_block(const EVP_CIPHER * c)139 static int tls_iv_length_within_key_block(const EVP_CIPHER *c)
140 {
141 /* If GCM/CCM mode only part of IV comes from PRF */
142 if (EVP_CIPHER_get_mode(c) == EVP_CIPH_GCM_MODE)
143 return EVP_GCM_TLS_FIXED_IV_LEN;
144 else if (EVP_CIPHER_get_mode(c) == EVP_CIPH_CCM_MODE)
145 return EVP_CCM_TLS_FIXED_IV_LEN;
146 else
147 return EVP_CIPHER_get_iv_length(c);
148 }
149
tls1_change_cipher_state(SSL * s,int which)150 int tls1_change_cipher_state(SSL *s, int which)
151 {
152 unsigned char *p, *mac_secret;
153 unsigned char *ms, *key, *iv;
154 EVP_CIPHER_CTX *dd;
155 const EVP_CIPHER *c;
156 #ifndef OPENSSL_NO_COMP
157 const SSL_COMP *comp;
158 #endif
159 const EVP_MD *m;
160 int mac_type;
161 size_t *mac_secret_size;
162 EVP_MD_CTX *mac_ctx;
163 EVP_PKEY *mac_key;
164 size_t n, i, j, k, cl;
165 int reuse_dd = 0;
166 #ifndef OPENSSL_NO_KTLS
167 ktls_crypto_info_t crypto_info;
168 void *rl_sequence;
169 BIO *bio;
170 #endif
171
172 c = s->s3.tmp.new_sym_enc;
173 m = s->s3.tmp.new_hash;
174 mac_type = s->s3.tmp.new_mac_pkey_type;
175 #ifndef OPENSSL_NO_COMP
176 comp = s->s3.tmp.new_compression;
177 #endif
178
179 if (which & SSL3_CC_READ) {
180 if (s->ext.use_etm)
181 s->s3.flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
182 else
183 s->s3.flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
184
185 if (s->s3.tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
186 s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM;
187 else
188 s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;
189
190 if (s->s3.tmp.new_cipher->algorithm2 & TLS1_TLSTREE)
191 s->mac_flags |= SSL_MAC_FLAG_READ_MAC_TLSTREE;
192 else
193 s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_TLSTREE;
194
195 if (s->enc_read_ctx != NULL) {
196 reuse_dd = 1;
197 } else if ((s->enc_read_ctx = EVP_CIPHER_CTX_new()) == NULL) {
198 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
199 goto err;
200 } else {
201 /*
202 * make sure it's initialised in case we exit later with an error
203 */
204 EVP_CIPHER_CTX_reset(s->enc_read_ctx);
205 }
206 dd = s->enc_read_ctx;
207 mac_ctx = ssl_replace_hash(&s->read_hash, NULL);
208 if (mac_ctx == NULL) {
209 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
210 goto err;
211 }
212 #ifndef OPENSSL_NO_COMP
213 COMP_CTX_free(s->expand);
214 s->expand = NULL;
215 if (comp != NULL) {
216 s->expand = COMP_CTX_new(comp->method);
217 if (s->expand == NULL) {
218 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
219 SSL_R_COMPRESSION_LIBRARY_ERROR);
220 goto err;
221 }
222 }
223 #endif
224 /*
225 * this is done by dtls1_reset_seq_numbers for DTLS
226 */
227 if (!SSL_IS_DTLS(s))
228 RECORD_LAYER_reset_read_sequence(&s->rlayer);
229 mac_secret = &(s->s3.read_mac_secret[0]);
230 mac_secret_size = &(s->s3.read_mac_secret_size);
231 } else {
232 s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
233 if (s->ext.use_etm)
234 s->s3.flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
235 else
236 s->s3.flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
237
238 if (s->s3.tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
239 s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
240 else
241 s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
242
243 if (s->s3.tmp.new_cipher->algorithm2 & TLS1_TLSTREE)
244 s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_TLSTREE;
245 else
246 s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_TLSTREE;
247 if (s->enc_write_ctx != NULL && !SSL_IS_DTLS(s)) {
248 reuse_dd = 1;
249 } else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL) {
250 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
251 goto err;
252 }
253 dd = s->enc_write_ctx;
254 if (SSL_IS_DTLS(s)) {
255 mac_ctx = EVP_MD_CTX_new();
256 if (mac_ctx == NULL) {
257 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
258 goto err;
259 }
260 s->write_hash = mac_ctx;
261 } else {
262 mac_ctx = ssl_replace_hash(&s->write_hash, NULL);
263 if (mac_ctx == NULL) {
264 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
265 goto err;
266 }
267 }
268 #ifndef OPENSSL_NO_COMP
269 COMP_CTX_free(s->compress);
270 s->compress = NULL;
271 if (comp != NULL) {
272 s->compress = COMP_CTX_new(comp->method);
273 if (s->compress == NULL) {
274 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
275 SSL_R_COMPRESSION_LIBRARY_ERROR);
276 goto err;
277 }
278 }
279 #endif
280 /*
281 * this is done by dtls1_reset_seq_numbers for DTLS
282 */
283 if (!SSL_IS_DTLS(s))
284 RECORD_LAYER_reset_write_sequence(&s->rlayer);
285 mac_secret = &(s->s3.write_mac_secret[0]);
286 mac_secret_size = &(s->s3.write_mac_secret_size);
287 }
288
289 if (reuse_dd)
290 EVP_CIPHER_CTX_reset(dd);
291
292 p = s->s3.tmp.key_block;
293 i = *mac_secret_size = s->s3.tmp.new_mac_secret_size;
294
295 cl = EVP_CIPHER_get_key_length(c);
296 j = cl;
297 k = tls_iv_length_within_key_block(c);
298 if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
299 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
300 ms = &(p[0]);
301 n = i + i;
302 key = &(p[n]);
303 n += j + j;
304 iv = &(p[n]);
305 n += k + k;
306 } else {
307 n = i;
308 ms = &(p[n]);
309 n += i + j;
310 key = &(p[n]);
311 n += j + k;
312 iv = &(p[n]);
313 n += k;
314 }
315
316 if (n > s->s3.tmp.key_block_length) {
317 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
318 goto err;
319 }
320
321 memcpy(mac_secret, ms, i);
322
323 if (!(EVP_CIPHER_get_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
324 if (mac_type == EVP_PKEY_HMAC) {
325 mac_key = EVP_PKEY_new_raw_private_key_ex(s->ctx->libctx, "HMAC",
326 s->ctx->propq, mac_secret,
327 *mac_secret_size);
328 } else {
329 /*
330 * If its not HMAC then the only other types of MAC we support are
331 * the GOST MACs, so we need to use the old style way of creating
332 * a MAC key.
333 */
334 mac_key = EVP_PKEY_new_mac_key(mac_type, NULL, mac_secret,
335 (int)*mac_secret_size);
336 }
337 if (mac_key == NULL
338 || EVP_DigestSignInit_ex(mac_ctx, NULL, EVP_MD_get0_name(m),
339 s->ctx->libctx, s->ctx->propq, mac_key,
340 NULL) <= 0) {
341 EVP_PKEY_free(mac_key);
342 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
343 goto err;
344 }
345 EVP_PKEY_free(mac_key);
346 }
347
348 OSSL_TRACE_BEGIN(TLS) {
349 BIO_printf(trc_out, "which = %04X, mac key:\n", which);
350 BIO_dump_indent(trc_out, ms, i, 4);
351 } OSSL_TRACE_END(TLS);
352
353 if (EVP_CIPHER_get_mode(c) == EVP_CIPH_GCM_MODE) {
354 if (!EVP_CipherInit_ex(dd, c, NULL, key, NULL, (which & SSL3_CC_WRITE))
355 || EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GCM_SET_IV_FIXED, (int)k,
356 iv) <= 0) {
357 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
358 goto err;
359 }
360 } else if (EVP_CIPHER_get_mode(c) == EVP_CIPH_CCM_MODE) {
361 int taglen;
362 if (s->s3.tmp.
363 new_cipher->algorithm_enc & (SSL_AES128CCM8 | SSL_AES256CCM8))
364 taglen = EVP_CCM8_TLS_TAG_LEN;
365 else
366 taglen = EVP_CCM_TLS_TAG_LEN;
367 if (!EVP_CipherInit_ex(dd, c, NULL, NULL, NULL, (which & SSL3_CC_WRITE))
368 || (EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_IVLEN, 12, NULL) <= 0)
369 || (EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_TAG, taglen, NULL) <= 0)
370 || (EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_CCM_SET_IV_FIXED, (int)k, iv) <= 0)
371 || !EVP_CipherInit_ex(dd, NULL, NULL, key, NULL, -1)) {
372 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
373 goto err;
374 }
375 } else {
376 if (!EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE))) {
377 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
378 goto err;
379 }
380 }
381 /* Needed for "composite" AEADs, such as RC4-HMAC-MD5 */
382 if ((EVP_CIPHER_get_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER)
383 && *mac_secret_size
384 && EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_MAC_KEY,
385 (int)*mac_secret_size, mac_secret) <= 0) {
386 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
387 goto err;
388 }
389
390 /*
391 * The cipher we actually ended up using in the EVP_CIPHER_CTX may be
392 * different to that in c if we have an ENGINE in use
393 */
394 if (EVP_CIPHER_get0_provider(EVP_CIPHER_CTX_get0_cipher(dd)) != NULL
395 && !tls_provider_set_tls_params(s, dd, c, m)) {
396 /* SSLfatal already called */
397 goto err;
398 }
399
400 #ifndef OPENSSL_NO_KTLS
401 if (s->compress || (s->options & SSL_OP_ENABLE_KTLS) == 0)
402 goto skip_ktls;
403
404 /* ktls supports only the maximum fragment size */
405 if (ssl_get_max_send_fragment(s) != SSL3_RT_MAX_PLAIN_LENGTH)
406 goto skip_ktls;
407
408 /* check that cipher is supported */
409 if (!ktls_check_supported_cipher(s, c, dd))
410 goto skip_ktls;
411
412 if (which & SSL3_CC_WRITE)
413 bio = s->wbio;
414 else
415 bio = s->rbio;
416
417 if (!ossl_assert(bio != NULL)) {
418 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
419 goto err;
420 }
421
422 /* All future data will get encrypted by ktls. Flush the BIO or skip ktls */
423 if (which & SSL3_CC_WRITE) {
424 if (BIO_flush(bio) <= 0)
425 goto skip_ktls;
426 }
427
428 /* ktls doesn't support renegotiation */
429 if ((BIO_get_ktls_send(s->wbio) && (which & SSL3_CC_WRITE)) ||
430 (BIO_get_ktls_recv(s->rbio) && (which & SSL3_CC_READ))) {
431 SSLfatal(s, SSL_AD_NO_RENEGOTIATION, ERR_R_INTERNAL_ERROR);
432 goto err;
433 }
434
435 if (which & SSL3_CC_WRITE)
436 rl_sequence = RECORD_LAYER_get_write_sequence(&s->rlayer);
437 else
438 rl_sequence = RECORD_LAYER_get_read_sequence(&s->rlayer);
439
440 if (!ktls_configure_crypto(s, c, dd, rl_sequence, &crypto_info,
441 which & SSL3_CC_WRITE, iv, key, ms,
442 *mac_secret_size))
443 goto skip_ktls;
444
445 /* ktls works with user provided buffers directly */
446 if (BIO_set_ktls(bio, &crypto_info, which & SSL3_CC_WRITE)) {
447 if (which & SSL3_CC_WRITE)
448 ssl3_release_write_buffer(s);
449 SSL_set_options(s, SSL_OP_NO_RENEGOTIATION);
450 }
451
452 skip_ktls:
453 #endif /* OPENSSL_NO_KTLS */
454 s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
455
456 OSSL_TRACE_BEGIN(TLS) {
457 BIO_printf(trc_out, "which = %04X, key:\n", which);
458 BIO_dump_indent(trc_out, key, EVP_CIPHER_get_key_length(c), 4);
459 BIO_printf(trc_out, "iv:\n");
460 BIO_dump_indent(trc_out, iv, k, 4);
461 } OSSL_TRACE_END(TLS);
462
463 return 1;
464 err:
465 return 0;
466 }
467
tls1_setup_key_block(SSL * s)468 int tls1_setup_key_block(SSL *s)
469 {
470 unsigned char *p;
471 const EVP_CIPHER *c;
472 const EVP_MD *hash;
473 SSL_COMP *comp;
474 int mac_type = NID_undef;
475 size_t num, mac_secret_size = 0;
476 int ret = 0;
477
478 if (s->s3.tmp.key_block_length != 0)
479 return 1;
480
481 if (!ssl_cipher_get_evp(s->ctx, s->session, &c, &hash, &mac_type,
482 &mac_secret_size, &comp, s->ext.use_etm)) {
483 /* Error is already recorded */
484 SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
485 return 0;
486 }
487
488 ssl_evp_cipher_free(s->s3.tmp.new_sym_enc);
489 s->s3.tmp.new_sym_enc = c;
490 ssl_evp_md_free(s->s3.tmp.new_hash);
491 s->s3.tmp.new_hash = hash;
492 s->s3.tmp.new_mac_pkey_type = mac_type;
493 s->s3.tmp.new_mac_secret_size = mac_secret_size;
494 num = mac_secret_size + EVP_CIPHER_get_key_length(c)
495 + tls_iv_length_within_key_block(c);
496 num *= 2;
497
498 ssl3_cleanup_key_block(s);
499
500 if ((p = OPENSSL_malloc(num)) == NULL) {
501 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
502 goto err;
503 }
504
505 s->s3.tmp.key_block_length = num;
506 s->s3.tmp.key_block = p;
507
508 OSSL_TRACE_BEGIN(TLS) {
509 BIO_printf(trc_out, "key block length: %zu\n", num);
510 BIO_printf(trc_out, "client random\n");
511 BIO_dump_indent(trc_out, s->s3.client_random, SSL3_RANDOM_SIZE, 4);
512 BIO_printf(trc_out, "server random\n");
513 BIO_dump_indent(trc_out, s->s3.server_random, SSL3_RANDOM_SIZE, 4);
514 BIO_printf(trc_out, "master key\n");
515 BIO_dump_indent(trc_out,
516 s->session->master_key,
517 s->session->master_key_length, 4);
518 } OSSL_TRACE_END(TLS);
519
520 if (!tls1_generate_key_block(s, p, num)) {
521 /* SSLfatal() already called */
522 goto err;
523 }
524
525 OSSL_TRACE_BEGIN(TLS) {
526 BIO_printf(trc_out, "key block\n");
527 BIO_dump_indent(trc_out, p, num, 4);
528 } OSSL_TRACE_END(TLS);
529
530 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)
531 && s->method->version <= TLS1_VERSION) {
532 /*
533 * enable vulnerability countermeasure for CBC ciphers with known-IV
534 * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
535 */
536 s->s3.need_empty_fragments = 1;
537
538 if (s->session->cipher != NULL) {
539 if (s->session->cipher->algorithm_enc == SSL_eNULL)
540 s->s3.need_empty_fragments = 0;
541
542 if (s->session->cipher->algorithm_enc == SSL_RC4)
543 s->s3.need_empty_fragments = 0;
544 }
545 }
546
547 ret = 1;
548 err:
549 return ret;
550 }
551
tls1_final_finish_mac(SSL * s,const char * str,size_t slen,unsigned char * out)552 size_t tls1_final_finish_mac(SSL *s, const char *str, size_t slen,
553 unsigned char *out)
554 {
555 size_t hashlen;
556 unsigned char hash[EVP_MAX_MD_SIZE];
557 size_t finished_size = TLS1_FINISH_MAC_LENGTH;
558
559 if (s->s3.tmp.new_cipher->algorithm_mkey & SSL_kGOST18)
560 finished_size = 32;
561
562 if (!ssl3_digest_cached_records(s, 0)) {
563 /* SSLfatal() already called */
564 return 0;
565 }
566
567 if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
568 /* SSLfatal() already called */
569 return 0;
570 }
571
572 if (!tls1_PRF(s, str, slen, hash, hashlen, NULL, 0, NULL, 0, NULL, 0,
573 s->session->master_key, s->session->master_key_length,
574 out, finished_size, 1)) {
575 /* SSLfatal() already called */
576 return 0;
577 }
578 OPENSSL_cleanse(hash, hashlen);
579 return finished_size;
580 }
581
tls1_generate_master_secret(SSL * s,unsigned char * out,unsigned char * p,size_t len,size_t * secret_size)582 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
583 size_t len, size_t *secret_size)
584 {
585 if (s->session->flags & SSL_SESS_FLAG_EXTMS) {
586 unsigned char hash[EVP_MAX_MD_SIZE * 2];
587 size_t hashlen;
588 /*
589 * Digest cached records keeping record buffer (if present): this won't
590 * affect client auth because we're freezing the buffer at the same
591 * point (after client key exchange and before certificate verify)
592 */
593 if (!ssl3_digest_cached_records(s, 1)
594 || !ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
595 /* SSLfatal() already called */
596 return 0;
597 }
598 OSSL_TRACE_BEGIN(TLS) {
599 BIO_printf(trc_out, "Handshake hashes:\n");
600 BIO_dump(trc_out, (char *)hash, hashlen);
601 } OSSL_TRACE_END(TLS);
602 if (!tls1_PRF(s,
603 TLS_MD_EXTENDED_MASTER_SECRET_CONST,
604 TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE,
605 hash, hashlen,
606 NULL, 0,
607 NULL, 0,
608 NULL, 0, p, len, out,
609 SSL3_MASTER_SECRET_SIZE, 1)) {
610 /* SSLfatal() already called */
611 return 0;
612 }
613 OPENSSL_cleanse(hash, hashlen);
614 } else {
615 if (!tls1_PRF(s,
616 TLS_MD_MASTER_SECRET_CONST,
617 TLS_MD_MASTER_SECRET_CONST_SIZE,
618 s->s3.client_random, SSL3_RANDOM_SIZE,
619 NULL, 0,
620 s->s3.server_random, SSL3_RANDOM_SIZE,
621 NULL, 0, p, len, out,
622 SSL3_MASTER_SECRET_SIZE, 1)) {
623 /* SSLfatal() already called */
624 return 0;
625 }
626 }
627
628 OSSL_TRACE_BEGIN(TLS) {
629 BIO_printf(trc_out, "Premaster Secret:\n");
630 BIO_dump_indent(trc_out, p, len, 4);
631 BIO_printf(trc_out, "Client Random:\n");
632 BIO_dump_indent(trc_out, s->s3.client_random, SSL3_RANDOM_SIZE, 4);
633 BIO_printf(trc_out, "Server Random:\n");
634 BIO_dump_indent(trc_out, s->s3.server_random, SSL3_RANDOM_SIZE, 4);
635 BIO_printf(trc_out, "Master Secret:\n");
636 BIO_dump_indent(trc_out,
637 s->session->master_key,
638 SSL3_MASTER_SECRET_SIZE, 4);
639 } OSSL_TRACE_END(TLS);
640
641 *secret_size = SSL3_MASTER_SECRET_SIZE;
642 return 1;
643 }
644
tls1_export_keying_material(SSL * s,unsigned char * out,size_t olen,const char * label,size_t llen,const unsigned char * context,size_t contextlen,int use_context)645 int tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen,
646 const char *label, size_t llen,
647 const unsigned char *context,
648 size_t contextlen, int use_context)
649 {
650 unsigned char *val = NULL;
651 size_t vallen = 0, currentvalpos;
652 int rv;
653
654 /*
655 * construct PRF arguments we construct the PRF argument ourself rather
656 * than passing separate values into the TLS PRF to ensure that the
657 * concatenation of values does not create a prohibited label.
658 */
659 vallen = llen + SSL3_RANDOM_SIZE * 2;
660 if (use_context) {
661 vallen += 2 + contextlen;
662 }
663
664 val = OPENSSL_malloc(vallen);
665 if (val == NULL)
666 goto err2;
667 currentvalpos = 0;
668 memcpy(val + currentvalpos, (unsigned char *)label, llen);
669 currentvalpos += llen;
670 memcpy(val + currentvalpos, s->s3.client_random, SSL3_RANDOM_SIZE);
671 currentvalpos += SSL3_RANDOM_SIZE;
672 memcpy(val + currentvalpos, s->s3.server_random, SSL3_RANDOM_SIZE);
673 currentvalpos += SSL3_RANDOM_SIZE;
674
675 if (use_context) {
676 val[currentvalpos] = (contextlen >> 8) & 0xff;
677 currentvalpos++;
678 val[currentvalpos] = contextlen & 0xff;
679 currentvalpos++;
680 if ((contextlen > 0) || (context != NULL)) {
681 memcpy(val + currentvalpos, context, contextlen);
682 }
683 }
684
685 /*
686 * disallow prohibited labels note that SSL3_RANDOM_SIZE > max(prohibited
687 * label len) = 15, so size of val > max(prohibited label len) = 15 and
688 * the comparisons won't have buffer overflow
689 */
690 if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST,
691 TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0)
692 goto err1;
693 if (memcmp(val, TLS_MD_SERVER_FINISH_CONST,
694 TLS_MD_SERVER_FINISH_CONST_SIZE) == 0)
695 goto err1;
696 if (memcmp(val, TLS_MD_MASTER_SECRET_CONST,
697 TLS_MD_MASTER_SECRET_CONST_SIZE) == 0)
698 goto err1;
699 if (memcmp(val, TLS_MD_EXTENDED_MASTER_SECRET_CONST,
700 TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE) == 0)
701 goto err1;
702 if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST,
703 TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0)
704 goto err1;
705
706 rv = tls1_PRF(s,
707 val, vallen,
708 NULL, 0,
709 NULL, 0,
710 NULL, 0,
711 NULL, 0,
712 s->session->master_key, s->session->master_key_length,
713 out, olen, 0);
714
715 goto ret;
716 err1:
717 ERR_raise(ERR_LIB_SSL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
718 rv = 0;
719 goto ret;
720 err2:
721 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
722 rv = 0;
723 ret:
724 OPENSSL_clear_free(val, vallen);
725 return rv;
726 }
727
tls1_alert_code(int code)728 int tls1_alert_code(int code)
729 {
730 switch (code) {
731 case SSL_AD_CLOSE_NOTIFY:
732 return SSL3_AD_CLOSE_NOTIFY;
733 case SSL_AD_UNEXPECTED_MESSAGE:
734 return SSL3_AD_UNEXPECTED_MESSAGE;
735 case SSL_AD_BAD_RECORD_MAC:
736 return SSL3_AD_BAD_RECORD_MAC;
737 case SSL_AD_DECRYPTION_FAILED:
738 return TLS1_AD_DECRYPTION_FAILED;
739 case SSL_AD_RECORD_OVERFLOW:
740 return TLS1_AD_RECORD_OVERFLOW;
741 case SSL_AD_DECOMPRESSION_FAILURE:
742 return SSL3_AD_DECOMPRESSION_FAILURE;
743 case SSL_AD_HANDSHAKE_FAILURE:
744 return SSL3_AD_HANDSHAKE_FAILURE;
745 case SSL_AD_NO_CERTIFICATE:
746 return -1;
747 case SSL_AD_BAD_CERTIFICATE:
748 return SSL3_AD_BAD_CERTIFICATE;
749 case SSL_AD_UNSUPPORTED_CERTIFICATE:
750 return SSL3_AD_UNSUPPORTED_CERTIFICATE;
751 case SSL_AD_CERTIFICATE_REVOKED:
752 return SSL3_AD_CERTIFICATE_REVOKED;
753 case SSL_AD_CERTIFICATE_EXPIRED:
754 return SSL3_AD_CERTIFICATE_EXPIRED;
755 case SSL_AD_CERTIFICATE_UNKNOWN:
756 return SSL3_AD_CERTIFICATE_UNKNOWN;
757 case SSL_AD_ILLEGAL_PARAMETER:
758 return SSL3_AD_ILLEGAL_PARAMETER;
759 case SSL_AD_UNKNOWN_CA:
760 return TLS1_AD_UNKNOWN_CA;
761 case SSL_AD_ACCESS_DENIED:
762 return TLS1_AD_ACCESS_DENIED;
763 case SSL_AD_DECODE_ERROR:
764 return TLS1_AD_DECODE_ERROR;
765 case SSL_AD_DECRYPT_ERROR:
766 return TLS1_AD_DECRYPT_ERROR;
767 case SSL_AD_EXPORT_RESTRICTION:
768 return TLS1_AD_EXPORT_RESTRICTION;
769 case SSL_AD_PROTOCOL_VERSION:
770 return TLS1_AD_PROTOCOL_VERSION;
771 case SSL_AD_INSUFFICIENT_SECURITY:
772 return TLS1_AD_INSUFFICIENT_SECURITY;
773 case SSL_AD_INTERNAL_ERROR:
774 return TLS1_AD_INTERNAL_ERROR;
775 case SSL_AD_USER_CANCELLED:
776 return TLS1_AD_USER_CANCELLED;
777 case SSL_AD_NO_RENEGOTIATION:
778 return TLS1_AD_NO_RENEGOTIATION;
779 case SSL_AD_UNSUPPORTED_EXTENSION:
780 return TLS1_AD_UNSUPPORTED_EXTENSION;
781 case SSL_AD_CERTIFICATE_UNOBTAINABLE:
782 return TLS1_AD_CERTIFICATE_UNOBTAINABLE;
783 case SSL_AD_UNRECOGNIZED_NAME:
784 return TLS1_AD_UNRECOGNIZED_NAME;
785 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
786 return TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
787 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
788 return TLS1_AD_BAD_CERTIFICATE_HASH_VALUE;
789 case SSL_AD_UNKNOWN_PSK_IDENTITY:
790 return TLS1_AD_UNKNOWN_PSK_IDENTITY;
791 case SSL_AD_INAPPROPRIATE_FALLBACK:
792 return TLS1_AD_INAPPROPRIATE_FALLBACK;
793 case SSL_AD_NO_APPLICATION_PROTOCOL:
794 return TLS1_AD_NO_APPLICATION_PROTOCOL;
795 case SSL_AD_CERTIFICATE_REQUIRED:
796 return SSL_AD_HANDSHAKE_FAILURE;
797 case TLS13_AD_MISSING_EXTENSION:
798 return SSL_AD_HANDSHAKE_FAILURE;
799 default:
800 return -1;
801 }
802 }
803