]> git.ipfire.org Git - thirdparty/openssl.git/blame - ssl/tls13_enc.c
projects / thirdparty / openssl.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Coverity fixes
[thirdparty/openssl.git] / ssl / tls13_enc.c
CommitLineData
34574f19 1/*
6738bf14 2 * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
34574f19 3 *
2c18d164 4 * Licensed under the Apache License 2.0 (the "License"). You may not use
34574f19
MC		 5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdlib.h>
11#include "ssl_locl.h"
08717544 12#include "internal/cryptlib.h"
34574f19
MC		 13#include <openssl/evp.h>
14#include <openssl/kdf.h>
15
0fb2815b 16#define TLS13_MAX_LABEL_LEN 249
34574f19
MC		 17
18/* Always filled with zeros */
19static const unsigned char default_zeros[EVP_MAX_MD_SIZE];
20
34574f19 21/*
a19ae67d
MC		 22 * Given a |secret|; a |label| of length |labellen|; and |data| of length
23 * |datalen| (e.g. typically a hash of the handshake messages), derive a new
24 * secret |outlen| bytes long and store it in the location pointed to be |out|.
0fb2815b
MC		 25 * The |data| value may be zero length. Any errors will be treated as fatal if
26 * |fatal| is set. Returns 1 on success 0 on failure.
34574f19 27 */
ec15acb6 28int tls13_hkdf_expand(SSL *s, const EVP_MD *md, const unsigned char *secret,
34574f19 29 const unsigned char *label, size_t labellen,
a19ae67d 30 const unsigned char *data, size_t datalen,
0fb2815b 31 unsigned char *out, size_t outlen, int fatal)
34574f19 32{
0fb2815b 33 static const unsigned char label_prefix[] = "tls13 ";
32495464 34 EVP_KDF_CTX *kctx = EVP_KDF_CTX_new_id(EVP_PKEY_HKDF);
34574f19
MC		 35 int ret;
36 size_t hkdflabellen;
37 size_t hashlen;
38 /*
0fb2815b
MC		 39 * 2 bytes for length of derived secret + 1 byte for length of combined
40 * prefix and label + bytes for the label itself + 1 byte length of hash
41 * + bytes for the hash itself
34574f19
MC		 42 */
43 unsigned char hkdflabel[sizeof(uint16_t) + sizeof(uint8_t) +
0b4233f5 44 + (sizeof(label_prefix) - 1) + TLS13_MAX_LABEL_LEN
0fb2815b 45 + 1 + EVP_MAX_MD_SIZE];
34574f19
MC		 46 WPACKET pkt;
47
32495464 48 if (kctx == NULL)
34574f19
MC		 49 return 0;
50
0fb2815b
MC		 51 if (labellen > TLS13_MAX_LABEL_LEN) {
52 if (fatal) {
53 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_HKDF_EXPAND,
54 ERR_R_INTERNAL_ERROR);
55 } else {
56 /*
57 * Probably we have been called from SSL_export_keying_material(),
58 * or SSL_export_keying_material_early().
59 */
60 SSLerr(SSL_F_TLS13_HKDF_EXPAND, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
61 }
32495464 62 EVP_KDF_CTX_free(kctx);
0fb2815b
MC		 63 return 0;
64 }
65
34574f19
MC		 66 hashlen = EVP_MD_size(md);
67
68 if (!WPACKET_init_static_len(&pkt, hkdflabel, sizeof(hkdflabel), 0)
69 || !WPACKET_put_bytes_u16(&pkt, outlen)
70 || !WPACKET_start_sub_packet_u8(&pkt)
71 || !WPACKET_memcpy(&pkt, label_prefix, sizeof(label_prefix) - 1)
72 || !WPACKET_memcpy(&pkt, label, labellen)
73 || !WPACKET_close(&pkt)
a19ae67d 74 || !WPACKET_sub_memcpy_u8(&pkt, data, (data == NULL) ? 0 : datalen)
34574f19
MC		 75 || !WPACKET_get_total_written(&pkt, &hkdflabellen)
76 || !WPACKET_finish(&pkt)) {
32495464 77 EVP_KDF_CTX_free(kctx);
34574f19 78 WPACKET_cleanup(&pkt);
0fb2815b
MC		 79 if (fatal)
80 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_HKDF_EXPAND,
81 ERR_R_INTERNAL_ERROR);
82 else
83 SSLerr(SSL_F_TLS13_HKDF_EXPAND, ERR_R_INTERNAL_ERROR);
34574f19
MC		 84 return 0;
85 }
86
32495464
DM		 87 ret = EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_HKDF_MODE,
88 EVP_PKEY_HKDEF_MODE_EXPAND_ONLY) <= 0
89 || EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_MD, md) <= 0
90 || EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_KEY, secret, hashlen) <= 0
91 || EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_ADD_HKDF_INFO,
92 hkdflabel, hkdflabellen) <= 0
93 || EVP_KDF_derive(kctx, out, outlen) <= 0;
34574f19 94
32495464 95 EVP_KDF_CTX_free(kctx);
34574f19 96
0fb2815b
MC		 97 if (ret != 0) {
98 if (fatal)
99 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_HKDF_EXPAND,
100 ERR_R_INTERNAL_ERROR);
101 else
102 SSLerr(SSL_F_TLS13_HKDF_EXPAND, ERR_R_INTERNAL_ERROR);
103 }
f63a17d6 104
34574f19
MC		 105 return ret == 0;
106}
107
34574f19 108/*
f5ca0b04
MC		 109 * Given a |secret| generate a |key| of length |keylen| bytes. Returns 1 on
110 * success 0 on failure.
34574f19 111 */
d49e23ec
MC		 112int tls13_derive_key(SSL *s, const EVP_MD *md, const unsigned char *secret,
113 unsigned char *key, size_t keylen)
34574f19 114{
f5ca0b04
MC		 115 static const unsigned char keylabel[] = "key";
116
d49e23ec 117 return tls13_hkdf_expand(s, md, secret, keylabel, sizeof(keylabel) - 1,
0fb2815b 118 NULL, 0, key, keylen, 1);
34574f19
MC		 119}
120
121/*
f5ca0b04
MC		 122 * Given a |secret| generate an |iv| of length |ivlen| bytes. Returns 1 on
123 * success 0 on failure.
34574f19 124 */
d49e23ec
MC		 125int tls13_derive_iv(SSL *s, const EVP_MD *md, const unsigned char *secret,
126 unsigned char *iv, size_t ivlen)
34574f19 127{
f5ca0b04
MC		 128 static const unsigned char ivlabel[] = "iv";
129
d49e23ec 130 return tls13_hkdf_expand(s, md, secret, ivlabel, sizeof(ivlabel) - 1,
0fb2815b 131 NULL, 0, iv, ivlen, 1);
34574f19
MC		 132}
133
ec15acb6
MC		 134int tls13_derive_finishedkey(SSL *s, const EVP_MD *md,
135 const unsigned char *secret,
136 unsigned char *fin, size_t finlen)
6484776f 137{
f5ca0b04
MC		 138 static const unsigned char finishedlabel[] = "finished";
139
ec15acb6 140 return tls13_hkdf_expand(s, md, secret, finishedlabel,
0fb2815b 141 sizeof(finishedlabel) - 1, NULL, 0, fin, finlen, 1);
6484776f
MC		 142}
143
34574f19
MC		 144/*
145 * Given the previous secret |prevsecret| and a new input secret |insecret| of
146 * length |insecretlen|, generate a new secret and store it in the location
f5ca0b04 147 * pointed to by |outsecret|. Returns 1 on success 0 on failure.
34574f19 148 */
ec15acb6
MC		 149int tls13_generate_secret(SSL *s, const EVP_MD *md,
150 const unsigned char *prevsecret,
151 const unsigned char *insecret,
152 size_t insecretlen,
153 unsigned char *outsecret)
34574f19 154{
34574f19 155 size_t mdlen, prevsecretlen;
bceae201 156 int mdleni;
34574f19 157 int ret;
32495464 158 EVP_KDF_CTX *kctx = EVP_KDF_CTX_new_id(EVP_PKEY_HKDF);
17aa119e 159 static const char derived_secret_label[] = "derived";
3e0458fb 160 unsigned char preextractsec[EVP_MAX_MD_SIZE];
34574f19 161
32495464 162 if (kctx == NULL) {
f63a17d6
MC		 163 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_GENERATE_SECRET,
164 ERR_R_INTERNAL_ERROR);
34574f19 165 return 0;
f63a17d6 166 }
34574f19 167
bceae201
MC		 168 mdleni = EVP_MD_size(md);
169 /* Ensure cast to size_t is safe */
170 if (!ossl_assert(mdleni >= 0)) {
171 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_GENERATE_SECRET,
172 ERR_R_INTERNAL_ERROR);
ad14e8e5 173 EVP_KDF_CTX_free(kctx);
bceae201
MC		 174 return 0;
175 }
176 mdlen = (size_t)mdleni;
34574f19
MC		 177
178 if (insecret == NULL) {
179 insecret = default_zeros;
180 insecretlen = mdlen;
181 }
182 if (prevsecret == NULL) {
183 prevsecret = default_zeros;
184 prevsecretlen = 0;
185 } else {
3e0458fb
MC		 186 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
187 unsigned char hash[EVP_MAX_MD_SIZE];
188
189 /* The pre-extract derive step uses a hash of no messages */
190 if (mctx == NULL
191 || EVP_DigestInit_ex(mctx, md, NULL) <= 0
192 || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) {
f63a17d6
MC		 193 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_GENERATE_SECRET,
194 ERR_R_INTERNAL_ERROR);
3e0458fb 195 EVP_MD_CTX_free(mctx);
32495464 196 EVP_KDF_CTX_free(kctx);
3e0458fb
MC		 197 return 0;
198 }
199 EVP_MD_CTX_free(mctx);
200
201 /* Generate the pre-extract secret */
202 if (!tls13_hkdf_expand(s, md, prevsecret,
203 (unsigned char *)derived_secret_label,
a19ae67d 204 sizeof(derived_secret_label) - 1, hash, mdlen,
0fb2815b 205 preextractsec, mdlen, 1)) {
f63a17d6 206 /* SSLfatal() already called */
32495464 207 EVP_KDF_CTX_free(kctx);
3e0458fb 208 return 0;
71d8c138 209 }
3e0458fb
MC		 210
211 prevsecret = preextractsec;
34574f19
MC		 212 prevsecretlen = mdlen;
213 }
214
32495464
DM		 215 ret = EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_HKDF_MODE,
216 EVP_PKEY_HKDEF_MODE_EXTRACT_ONLY) <= 0
217 || EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_MD, md) <= 0
218 || EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_KEY, insecret, insecretlen) <= 0
219 || EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_SALT,
220 prevsecret, prevsecretlen) <= 0
221 || EVP_KDF_derive(kctx, outsecret, mdlen) <= 0;
34574f19 222
f63a17d6
MC		 223 if (ret != 0)
224 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_GENERATE_SECRET,
225 ERR_R_INTERNAL_ERROR);
226
32495464 227 EVP_KDF_CTX_free(kctx);
3e0458fb
MC		 228 if (prevsecret == preextractsec)
229 OPENSSL_cleanse(preextractsec, mdlen);
34574f19
MC		 230 return ret == 0;
231}
232
34574f19
MC		 233/*
234 * Given an input secret |insecret| of length |insecretlen| generate the
235 * handshake secret. This requires the early secret to already have been
f5ca0b04 236 * generated. Returns 1 on success 0 on failure.
34574f19
MC		 237 */
238int tls13_generate_handshake_secret(SSL *s, const unsigned char *insecret,
239 size_t insecretlen)
240{
f63a17d6 241 /* Calls SSLfatal() if required */
ec15acb6
MC		 242 return tls13_generate_secret(s, ssl_handshake_md(s), s->early_secret,
243 insecret, insecretlen,
34574f19
MC		 244 (unsigned char *)&s->handshake_secret);
245}
246
247/*
248 * Given the handshake secret |prev| of length |prevlen| generate the master
f5ca0b04
MC		 249 * secret and store its length in |*secret_size|. Returns 1 on success 0 on
250 * failure.
34574f19
MC		 251 */
252int tls13_generate_master_secret(SSL *s, unsigned char *out,
253 unsigned char *prev, size_t prevlen,
254 size_t *secret_size)
255{
ec15acb6
MC		 256 const EVP_MD *md = ssl_handshake_md(s);
257
258 *secret_size = EVP_MD_size(md);
f63a17d6 259 /* Calls SSLfatal() if required */
ec15acb6 260 return tls13_generate_secret(s, md, prev, NULL, 0, out);
34574f19
MC		 261}
262
92760c21 263/*
f5ca0b04
MC		 264 * Generates the mac for the Finished message. Returns the length of the MAC or
265 * 0 on error.
92760c21
MC		 266 */
267size_t tls13_final_finish_mac(SSL *s, const char *str, size_t slen,
268 unsigned char *out)
269{
6484776f
MC		 270 const EVP_MD *md = ssl_handshake_md(s);
271 unsigned char hash[EVP_MAX_MD_SIZE];
272 size_t hashlen, ret = 0;
273 EVP_PKEY *key = NULL;
274 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
92760c21 275
d4d2f3a4
MC		 276 if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
277 /* SSLfatal() already called */
6484776f 278 goto err;
d4d2f3a4 279 }
6484776f 280
de9f5b35 281 if (str == s->method->ssl3_enc->server_finished_label) {
f929439f
MC		 282 key = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL,
283 s->server_finished_secret, hashlen);
de9f5b35 284 } else if (SSL_IS_FIRST_HANDSHAKE(s)) {
f929439f
MC		 285 key = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL,
286 s->client_finished_secret, hashlen);
de9f5b35
MC		 287 } else {
288 unsigned char finsecret[EVP_MAX_MD_SIZE];
289
290 if (!tls13_derive_finishedkey(s, ssl_handshake_md(s),
291 s->client_app_traffic_secret,
292 finsecret, hashlen))
293 goto err;
294
295 key = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL, finsecret,
296 hashlen);
8f39d8af 297 OPENSSL_cleanse(finsecret, sizeof(finsecret));
de9f5b35 298 }
6484776f
MC		 299
300 if (key == NULL
301 || ctx == NULL
302 || EVP_DigestSignInit(ctx, NULL, md, NULL, key) <= 0
303 || EVP_DigestSignUpdate(ctx, hash, hashlen) <= 0
d4d2f3a4
MC		 304 || EVP_DigestSignFinal(ctx, out, &hashlen) <= 0) {
305 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_FINAL_FINISH_MAC,
306 ERR_R_INTERNAL_ERROR);
6484776f 307 goto err;
d4d2f3a4 308 }
92760c21 309
6484776f
MC		 310 ret = hashlen;
311 err:
312 EVP_PKEY_free(key);
313 EVP_MD_CTX_free(ctx);
314 return ret;
92760c21
MC		 315}
316
317/*
318 * There isn't really a key block in TLSv1.3, but we still need this function
f5ca0b04 319 * for initialising the cipher and hash. Returns 1 on success or 0 on failure.
92760c21
MC		 320 */
321int tls13_setup_key_block(SSL *s)
322{
323 const EVP_CIPHER *c;
324 const EVP_MD *hash;
92760c21 325
555cbb32 326 s->session->cipher = s->s3.tmp.new_cipher;
ea09abc8 327 if (!ssl_cipher_get_evp(s->session, &c, &hash, NULL, NULL, NULL, 0)) {
f63a17d6
MC		 328 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_SETUP_KEY_BLOCK,
329 SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
92760c21
MC		 330 return 0;
331 }
332
555cbb32
TS		 333 s->s3.tmp.new_sym_enc = c;
334 s->s3.tmp.new_hash = hash;
92760c21
MC		 335
336 return 1;
337}
338
d1186c30 339static int derive_secret_key_and_iv(SSL *s, int sending, const EVP_MD *md,
d49e23ec 340 const EVP_CIPHER *ciph,
57389a32
MC		 341 const unsigned char *insecret,
342 const unsigned char *hash,
343 const unsigned char *label,
344 size_t labellen, unsigned char *secret,
345 unsigned char *iv, EVP_CIPHER_CTX *ciph_ctx)
346{
347 unsigned char key[EVP_MAX_KEY_LENGTH];
348 size_t ivlen, keylen, taglen;
bceae201
MC		 349 int hashleni = EVP_MD_size(md);
350 size_t hashlen;
351
352 /* Ensure cast to size_t is safe */
353 if (!ossl_assert(hashleni >= 0)) {
354 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DERIVE_SECRET_KEY_AND_IV,
355 ERR_R_EVP_LIB);
356 goto err;
357 }
358 hashlen = (size_t)hashleni;
57389a32 359
a19ae67d 360 if (!tls13_hkdf_expand(s, md, insecret, label, labellen, hash, hashlen,
0fb2815b 361 secret, hashlen, 1)) {
f63a17d6 362 /* SSLfatal() already called */
57389a32
MC		 363 goto err;
364 }
365
366 /* TODO(size_t): convert me */
367 keylen = EVP_CIPHER_key_length(ciph);
368 if (EVP_CIPHER_mode(ciph) == EVP_CIPH_CCM_MODE) {
c117af67
MC		 369 uint32_t algenc;
370
57389a32 371 ivlen = EVP_CCM_TLS_IV_LEN;
555cbb32 372 if (s->s3.tmp.new_cipher == NULL) {
c117af67
MC		 373 /* We've not selected a cipher yet - we must be doing early data */
374 algenc = s->session->cipher->algorithm_enc;
375 } else {
555cbb32 376 algenc = s->s3.tmp.new_cipher->algorithm_enc;
c117af67
MC		 377 }
378 if (algenc & (SSL_AES128CCM8 | SSL_AES256CCM8))
57389a32
MC		 379 taglen = EVP_CCM8_TLS_TAG_LEN;
380 else
381 taglen = EVP_CCM_TLS_TAG_LEN;
382 } else {
383 ivlen = EVP_CIPHER_iv_length(ciph);
384 taglen = 0;
385 }
386
d49e23ec
MC		 387 if (!tls13_derive_key(s, md, secret, key, keylen)
388 || !tls13_derive_iv(s, md, secret, iv, ivlen)) {
f63a17d6 389 /* SSLfatal() already called */
57389a32
MC		 390 goto err;
391 }
392
d1186c30 393 if (EVP_CipherInit_ex(ciph_ctx, ciph, NULL, NULL, NULL, sending) <= 0
57389a32
MC		 394 || !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_IVLEN, ivlen, NULL)
395 || (taglen != 0 && !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_TAG,
396 taglen, NULL))
397 || EVP_CipherInit_ex(ciph_ctx, NULL, NULL, key, NULL, -1) <= 0) {
f63a17d6
MC		 398 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DERIVE_SECRET_KEY_AND_IV,
399 ERR_R_EVP_LIB);
57389a32
MC		 400 goto err;
401 }
402
57389a32
MC		 403 return 1;
404 err:
405 OPENSSL_cleanse(key, sizeof(key));
406 return 0;
407}
408
0d9824c1
MC		 409int tls13_change_cipher_state(SSL *s, int which)
410{
17aa119e
MC		 411 static const unsigned char client_early_traffic[] = "c e traffic";
412 static const unsigned char client_handshake_traffic[] = "c hs traffic";
413 static const unsigned char client_application_traffic[] = "c ap traffic";
414 static const unsigned char server_handshake_traffic[] = "s hs traffic";
415 static const unsigned char server_application_traffic[] = "s ap traffic";
0ca8d1ec 416 static const unsigned char exporter_master_secret[] = "exp master";
17aa119e 417 static const unsigned char resumption_master_secret[] = "res master";
b38ede80 418 static const unsigned char early_exporter_master_secret[] = "e exp master";
bebc0c7d 419 unsigned char *iv;
0d9824c1 420 unsigned char secret[EVP_MAX_MD_SIZE];
ace081c1
MC		 421 unsigned char hashval[EVP_MAX_MD_SIZE];
422 unsigned char *hash = hashval;
0d9824c1 423 unsigned char *insecret;
6484776f 424 unsigned char *finsecret = NULL;
2c7bd692 425 const char *log_label = NULL;
0d9824c1 426 EVP_CIPHER_CTX *ciph_ctx;
57389a32 427 size_t finsecretlen = 0;
0d9824c1 428 const unsigned char *label;
ace081c1 429 size_t labellen, hashlen = 0;
6530c490 430 int ret = 0;
42f50fdf
MC		 431 const EVP_MD *md = NULL;
432 const EVP_CIPHER *cipher = NULL;
0d9824c1
MC		 433
434 if (which & SSL3_CC_READ) {
435 if (s->enc_read_ctx != NULL) {
436 EVP_CIPHER_CTX_reset(s->enc_read_ctx);
437 } else {
438 s->enc_read_ctx = EVP_CIPHER_CTX_new();
439 if (s->enc_read_ctx == NULL) {
f63a17d6
MC		 440 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
441 SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
0d9824c1
MC		 442 goto err;
443 }
444 }
445 ciph_ctx = s->enc_read_ctx;
bebc0c7d 446 iv = s->read_iv;
0d9824c1
MC		 447
448 RECORD_LAYER_reset_read_sequence(&s->rlayer);
449 } else {
7426cd34 450 s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
0d9824c1
MC		 451 if (s->enc_write_ctx != NULL) {
452 EVP_CIPHER_CTX_reset(s->enc_write_ctx);
453 } else {
454 s->enc_write_ctx = EVP_CIPHER_CTX_new();
455 if (s->enc_write_ctx == NULL) {
f63a17d6
MC		 456 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
457 SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
0d9824c1
MC		 458 goto err;
459 }
460 }
461 ciph_ctx = s->enc_write_ctx;
bebc0c7d 462 iv = s->write_iv;
0d9824c1
MC		 463
464 RECORD_LAYER_reset_write_sequence(&s->rlayer);
465 }
466
467 if (((which & SSL3_CC_CLIENT) && (which & SSL3_CC_WRITE))
468 || ((which & SSL3_CC_SERVER) && (which & SSL3_CC_READ))) {
d49e23ec
MC		 469 if (which & SSL3_CC_EARLY) {
470 EVP_MD_CTX *mdctx = NULL;
471 long handlen;
472 void *hdata;
473 unsigned int hashlenui;
474 const SSL_CIPHER *sslcipher = SSL_SESSION_get0_cipher(s->session);
475
476 insecret = s->early_secret;
477 label = client_early_traffic;
478 labellen = sizeof(client_early_traffic) - 1;
479 log_label = CLIENT_EARLY_LABEL;
480
555cbb32 481 handlen = BIO_get_mem_data(s->s3.handshake_buffer, &hdata);
d49e23ec 482 if (handlen <= 0) {
f63a17d6
MC		 483 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
484 SSL_F_TLS13_CHANGE_CIPHER_STATE,
485 SSL_R_BAD_HANDSHAKE_LENGTH);
d49e23ec
MC		 486 goto err;
487 }
add8d0e9 488
08717544
MC		 489 if (s->early_data_state == SSL_EARLY_DATA_CONNECTING
490 && s->max_early_data > 0
491 && s->session->ext.max_early_data == 0) {
492 /*
493 * If we are attempting to send early data, and we've decided to
494 * actually do it but max_early_data in s->session is 0 then we
495 * must be using an external PSK.
496 */
497 if (!ossl_assert(s->psksession != NULL
498 && s->max_early_data ==
499 s->psksession->ext.max_early_data)) {
f63a17d6
MC		 500 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
501 SSL_F_TLS13_CHANGE_CIPHER_STATE,
502 ERR_R_INTERNAL_ERROR);
08717544
MC		 503 goto err;
504 }
add8d0e9 505 sslcipher = SSL_SESSION_get0_cipher(s->psksession);
08717544 506 }
d49e23ec 507 if (sslcipher == NULL) {
f63a17d6
MC		 508 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
509 SSL_F_TLS13_CHANGE_CIPHER_STATE, SSL_R_BAD_PSK);
d49e23ec
MC		 510 goto err;
511 }
512
513 /*
514 * We need to calculate the handshake digest using the digest from
515 * the session. We haven't yet selected our ciphersuite so we can't
516 * use ssl_handshake_md().
517 */
518 mdctx = EVP_MD_CTX_new();
519 if (mdctx == NULL) {
f63a17d6
MC		 520 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
521 SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
d49e23ec
MC		 522 goto err;
523 }
524 cipher = EVP_get_cipherbynid(SSL_CIPHER_get_cipher_nid(sslcipher));
525 md = ssl_md(sslcipher->algorithm2);
526 if (md == NULL || !EVP_DigestInit_ex(mdctx, md, NULL)
527 || !EVP_DigestUpdate(mdctx, hdata, handlen)
528 || !EVP_DigestFinal_ex(mdctx, hashval, &hashlenui)) {
f63a17d6
MC		 529 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
530 SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
d49e23ec
MC		 531 EVP_MD_CTX_free(mdctx);
532 goto err;
533 }
534 hashlen = hashlenui;
535 EVP_MD_CTX_free(mdctx);
b38ede80
TT		 536
537 if (!tls13_hkdf_expand(s, md, insecret,
538 early_exporter_master_secret,
539 sizeof(early_exporter_master_secret) - 1,
540 hashval, hashlen,
0fb2815b
MC		 541 s->early_exporter_master_secret, hashlen,
542 1)) {
b38ede80
TT		 543 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
544 SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
545 goto err;
546 }
01a2a654
PW		 547
548 if (!ssl_log_secret(s, EARLY_EXPORTER_SECRET_LABEL,
549 s->early_exporter_master_secret, hashlen)) {
550 /* SSLfatal() already called */
551 goto err;
552 }
d49e23ec 553 } else if (which & SSL3_CC_HANDSHAKE) {
0d9824c1 554 insecret = s->handshake_secret;
6484776f 555 finsecret = s->client_finished_secret;
6612d87b 556 finsecretlen = EVP_MD_size(ssl_handshake_md(s));
0d9824c1
MC		 557 label = client_handshake_traffic;
558 labellen = sizeof(client_handshake_traffic) - 1;
2c7bd692 559 log_label = CLIENT_HANDSHAKE_LABEL;
fe5e20fd 560 /*
69687aa8 561 * The handshake hash used for the server read/client write handshake
f7e393be
MC		 562 * traffic secret is the same as the hash for the server
563 * write/client read handshake traffic secret. However, if we
564 * processed early data then we delay changing the server
565 * read/client write cipher state until later, and the handshake
566 * hashes have moved on. Therefore we use the value saved earlier
567 * when we did the server write/client read change cipher state.
fe5e20fd 568 */
f7e393be 569 hash = s->handshake_traffic_hash;
0d9824c1 570 } else {
ec15acb6 571 insecret = s->master_secret;
0d9824c1
MC		 572 label = client_application_traffic;
573 labellen = sizeof(client_application_traffic) - 1;
2c7bd692 574 log_label = CLIENT_APPLICATION_LABEL;
ace081c1
MC		 575 /*
576 * For this we only use the handshake hashes up until the server
577 * Finished hash. We do not include the client's Finished, which is
578 * what ssl_handshake_hash() would give us. Instead we use the
579 * previously saved value.
580 */
581 hash = s->server_finished_hash;
0d9824c1
MC		 582 }
583 } else {
d49e23ec 584 /* Early data never applies to client-read/server-write */
0d9824c1
MC		 585 if (which & SSL3_CC_HANDSHAKE) {
586 insecret = s->handshake_secret;
6484776f 587 finsecret = s->server_finished_secret;
6612d87b 588 finsecretlen = EVP_MD_size(ssl_handshake_md(s));
0d9824c1
MC		 589 label = server_handshake_traffic;
590 labellen = sizeof(server_handshake_traffic) - 1;
2c7bd692 591 log_label = SERVER_HANDSHAKE_LABEL;
0d9824c1 592 } else {
ec15acb6 593 insecret = s->master_secret;
0d9824c1
MC		 594 label = server_application_traffic;
595 labellen = sizeof(server_application_traffic) - 1;
2c7bd692 596 log_label = SERVER_APPLICATION_LABEL;
0d9824c1
MC		 597 }
598 }
599
d49e23ec
MC		 600 if (!(which & SSL3_CC_EARLY)) {
601 md = ssl_handshake_md(s);
555cbb32 602 cipher = s->s3.tmp.new_sym_enc;
d49e23ec
MC		 603 if (!ssl3_digest_cached_records(s, 1)
604 || !ssl_handshake_hash(s, hashval, sizeof(hashval), &hashlen)) {
f63a17d6 605 /* SSLfatal() already called */;
d49e23ec
MC		 606 goto err;
607 }
ace081c1
MC		 608 }
609
ec15acb6
MC		 610 /*
611 * Save the hash of handshakes up to now for use when we calculate the
612 * client application traffic secret
613 */
614 if (label == server_application_traffic)
615 memcpy(s->server_finished_hash, hashval, hashlen);
616
f7e393be 617 if (label == server_handshake_traffic)
fe5e20fd
MC		 618 memcpy(s->handshake_traffic_hash, hashval, hashlen);
619
ec15acb6
MC		 620 if (label == client_application_traffic) {
621 /*
622 * We also create the resumption master secret, but this time use the
623 * hash for the whole handshake including the Client Finished
624 */
625 if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
626 resumption_master_secret,
627 sizeof(resumption_master_secret) - 1,
4ff1a526 628 hashval, hashlen, s->resumption_master_secret,
0fb2815b 629 hashlen, 1)) {
f63a17d6 630 /* SSLfatal() already called */
ec15acb6
MC		 631 goto err;
632 }
ec15acb6
MC		 633 }
634
d49e23ec
MC		 635 if (!derive_secret_key_and_iv(s, which & SSL3_CC_WRITE, md, cipher,
636 insecret, hash, label, labellen, secret, iv,
637 ciph_ctx)) {
f63a17d6 638 /* SSLfatal() already called */
57389a32 639 goto err;
ec07b1d8 640 }
0d9824c1 641
2221ec10 642 if (label == server_application_traffic) {
57389a32 643 memcpy(s->server_app_traffic_secret, secret, hashlen);
2221ec10
TT		 644 /* Now we create the exporter master secret */
645 if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
646 exporter_master_secret,
647 sizeof(exporter_master_secret) - 1,
648 hash, hashlen, s->exporter_master_secret,
0fb2815b 649 hashlen, 1)) {
2221ec10
TT		 650 /* SSLfatal() already called */
651 goto err;
652 }
6329ce8f
PW		 653
654 if (!ssl_log_secret(s, EXPORTER_SECRET_LABEL, s->exporter_master_secret,
655 hashlen)) {
656 /* SSLfatal() already called */
657 goto err;
658 }
2221ec10 659 } else if (label == client_application_traffic)
57389a32
MC		 660 memcpy(s->client_app_traffic_secret, secret, hashlen);
661
2c7bd692 662 if (!ssl_log_secret(s, log_label, secret, hashlen)) {
f63a17d6 663 /* SSLfatal() already called */
2c7bd692
CB		 664 goto err;
665 }
666
57389a32
MC		 667 if (finsecret != NULL
668 && !tls13_derive_finishedkey(s, ssl_handshake_md(s), secret,
669 finsecret, finsecretlen)) {
f63a17d6 670 /* SSLfatal() already called */
0d9824c1
MC		 671 goto err;
672 }
673
7426cd34
MC		 674 if (!s->server && label == client_early_traffic)
675 s->statem.enc_write_state = ENC_WRITE_STATE_WRITE_PLAIN_ALERTS;
676 else
677 s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
57389a32
MC		 678 ret = 1;
679 err:
680 OPENSSL_cleanse(secret, sizeof(secret));
681 return ret;
682}
0d9824c1 683
d1186c30 684int tls13_update_key(SSL *s, int sending)
57389a32 685{
17aa119e 686 static const unsigned char application_traffic[] = "traffic upd";
57389a32
MC		 687 const EVP_MD *md = ssl_handshake_md(s);
688 size_t hashlen = EVP_MD_size(md);
689 unsigned char *insecret, *iv;
690 unsigned char secret[EVP_MAX_MD_SIZE];
691 EVP_CIPHER_CTX *ciph_ctx;
692 int ret = 0;
0d9824c1 693
d1186c30 694 if (s->server == sending)
57389a32
MC		 695 insecret = s->server_app_traffic_secret;
696 else
697 insecret = s->client_app_traffic_secret;
bebc0c7d 698
d1186c30 699 if (sending) {
7426cd34 700 s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
57389a32
MC		 701 iv = s->write_iv;
702 ciph_ctx = s->enc_write_ctx;
703 RECORD_LAYER_reset_write_sequence(&s->rlayer);
704 } else {
705 iv = s->read_iv;
706 ciph_ctx = s->enc_read_ctx;
707 RECORD_LAYER_reset_read_sequence(&s->rlayer);
0d9824c1 708 }
57389a32 709
d1186c30 710 if (!derive_secret_key_and_iv(s, sending, ssl_handshake_md(s),
555cbb32 711 s->s3.tmp.new_sym_enc, insecret, NULL,
d49e23ec 712 application_traffic,
57389a32 713 sizeof(application_traffic) - 1, secret, iv,
f63a17d6
MC		 714 ciph_ctx)) {
715 /* SSLfatal() already called */
57389a32 716 goto err;
f63a17d6 717 }
57389a32
MC		 718
719 memcpy(insecret, secret, hashlen);
0d9824c1 720
7426cd34 721 s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
6530c490 722 ret = 1;
0d9824c1
MC		 723 err:
724 OPENSSL_cleanse(secret, sizeof(secret));
6530c490 725 return ret;
0d9824c1 726}
04904312
MC		 727
728int tls13_alert_code(int code)
729{
43a0f273
MC		 730 /* There are 2 additional alerts in TLSv1.3 compared to TLSv1.2 */
731 if (code == SSL_AD_MISSING_EXTENSION || code == SSL_AD_CERTIFICATE_REQUIRED)
04904312
MC		 732 return code;
733
734 return tls1_alert_code(code);
735}
0ca8d1ec
MC		 736
737int tls13_export_keying_material(SSL *s, unsigned char *out, size_t olen,
738 const char *label, size_t llen,
739 const unsigned char *context,
740 size_t contextlen, int use_context)
741{
742 unsigned char exportsecret[EVP_MAX_MD_SIZE];
743 static const unsigned char exporterlabel[] = "exporter";
c8b93876 744 unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
0ca8d1ec
MC		 745 const EVP_MD *md = ssl_handshake_md(s);
746 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
c8b93876 747 unsigned int hashsize, datalen;
0ca8d1ec
MC		 748 int ret = 0;
749
1f5878b8 750 if (ctx == NULL || !ossl_statem_export_allowed(s))
0ca8d1ec
MC		 751 goto err;
752
753 if (!use_context)
754 contextlen = 0;
755
756 if (EVP_DigestInit_ex(ctx, md, NULL) <= 0
757 || EVP_DigestUpdate(ctx, context, contextlen) <= 0
758 || EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
c8b93876
TT		 759 || EVP_DigestInit_ex(ctx, md, NULL) <= 0
760 || EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
0ca8d1ec 761 || !tls13_hkdf_expand(s, md, s->exporter_master_secret,
c8b93876 762 (const unsigned char *)label, llen,
0fb2815b 763 data, datalen, exportsecret, hashsize, 0)
0ca8d1ec 764 || !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
a19ae67d 765 sizeof(exporterlabel) - 1, hash, hashsize,
0fb2815b 766 out, olen, 0))
0ca8d1ec
MC		 767 goto err;
768
769 ret = 1;
770 err:
771 EVP_MD_CTX_free(ctx);
772 return ret;
773}
b38ede80
TT		 774
775int tls13_export_keying_material_early(SSL *s, unsigned char *out, size_t olen,
776 const char *label, size_t llen,
777 const unsigned char *context,
778 size_t contextlen)
779{
780 static const unsigned char exporterlabel[] = "exporter";
781 unsigned char exportsecret[EVP_MAX_MD_SIZE];
782 unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
783 const EVP_MD *md;
784 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
785 unsigned int hashsize, datalen;
786 int ret = 0;
787 const SSL_CIPHER *sslcipher;
788
789 if (ctx == NULL || !ossl_statem_export_early_allowed(s))
790 goto err;
791
792 if (!s->server && s->max_early_data > 0
793 && s->session->ext.max_early_data == 0)
794 sslcipher = SSL_SESSION_get0_cipher(s->psksession);
795 else
796 sslcipher = SSL_SESSION_get0_cipher(s->session);
797
798 md = ssl_md(sslcipher->algorithm2);
799
800 /*
801 * Calculate the hash value and store it in |data|. The reason why
802 * the empty string is used is that the definition of TLS-Exporter
803 * is like so:
804 *
805 * TLS-Exporter(label, context_value, key_length) =
806 * HKDF-Expand-Label(Derive-Secret(Secret, label, ""),
807 * "exporter", Hash(context_value), key_length)
808 *
809 * Derive-Secret(Secret, Label, Messages) =
810 * HKDF-Expand-Label(Secret, Label,
811 * Transcript-Hash(Messages), Hash.length)
812 *
813 * Here Transcript-Hash is the cipher suite hash algorithm.
814 */
815 if (EVP_DigestInit_ex(ctx, md, NULL) <= 0
816 || EVP_DigestUpdate(ctx, context, contextlen) <= 0
817 || EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
818 || EVP_DigestInit_ex(ctx, md, NULL) <= 0
819 || EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
820 || !tls13_hkdf_expand(s, md, s->early_exporter_master_secret,
821 (const unsigned char *)label, llen,
0fb2815b 822 data, datalen, exportsecret, hashsize, 0)
b38ede80
TT		 823 || !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
824 sizeof(exporterlabel) - 1, hash, hashsize,
0fb2815b 825 out, olen, 0))
b38ede80
TT		 826 goto err;
827
828 ret = 1;
829 err:
830 EVP_MD_CTX_free(ctx);
831 return ret;
832}
A mirror of the official openssl repository