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