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Fix TLS/SSL PRF usages.
[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>
ce3b1bb4 15#include <openssl/core_names.h>
34574f19 16
0fb2815b 17#define TLS13_MAX_LABEL_LEN 249
34574f19
MC		 18
19/* Always filled with zeros */
20static const unsigned char default_zeros[EVP_MAX_MD_SIZE];
21
34574f19 22/*
a19ae67d
MC		 23 * Given a |secret|; a |label| of length |labellen|; and |data| of length
24 * |datalen| (e.g. typically a hash of the handshake messages), derive a new
25 * secret |outlen| bytes long and store it in the location pointed to be |out|.
0fb2815b
MC		 26 * The |data| value may be zero length. Any errors will be treated as fatal if
27 * |fatal| is set. Returns 1 on success 0 on failure.
34574f19 28 */
ec15acb6 29int tls13_hkdf_expand(SSL *s, const EVP_MD *md, const unsigned char *secret,
34574f19 30 const unsigned char *label, size_t labellen,
a19ae67d 31 const unsigned char *data, size_t datalen,
0fb2815b 32 unsigned char *out, size_t outlen, int fatal)
34574f19 33{
48102247 34#ifdef CHARSET_EBCDIC
35 static const unsigned char label_prefix[] = { 0x74, 0x6C, 0x73, 0x31, 0x33, 0x20, 0x00 };
36#else
0fb2815b 37 static const unsigned char label_prefix[] = "tls13 ";
48102247 38#endif
ce3b1bb4
P		 39 EVP_KDF *kdf = EVP_KDF_fetch(NULL, SN_hkdf, NULL);
40 EVP_KDF_CTX *kctx;
41 OSSL_PARAM params[5], *p = params;
42 int mode = EVP_PKEY_HKDEF_MODE_EXPAND_ONLY;
43 const char *mdname = EVP_MD_name(md);
34574f19
MC		 44 int ret;
45 size_t hkdflabellen;
46 size_t hashlen;
47 /*
0fb2815b
MC		 48 * 2 bytes for length of derived secret + 1 byte for length of combined
49 * prefix and label + bytes for the label itself + 1 byte length of hash
50 * + bytes for the hash itself
34574f19
MC		 51 */
52 unsigned char hkdflabel[sizeof(uint16_t) + sizeof(uint8_t) +
0b4233f5 53 + (sizeof(label_prefix) - 1) + TLS13_MAX_LABEL_LEN
0fb2815b 54 + 1 + EVP_MAX_MD_SIZE];
34574f19
MC		 55 WPACKET pkt;
56
ce3b1bb4
P		 57 kctx = EVP_KDF_CTX_new(kdf);
58 EVP_KDF_free(kdf);
32495464 59 if (kctx == NULL)
34574f19
MC		 60 return 0;
61
0fb2815b
MC		 62 if (labellen > TLS13_MAX_LABEL_LEN) {
63 if (fatal) {
64 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_HKDF_EXPAND,
65 ERR_R_INTERNAL_ERROR);
66 } else {
67 /*
68 * Probably we have been called from SSL_export_keying_material(),
69 * or SSL_export_keying_material_early().
70 */
71 SSLerr(SSL_F_TLS13_HKDF_EXPAND, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
72 }
32495464 73 EVP_KDF_CTX_free(kctx);
0fb2815b
MC		 74 return 0;
75 }
76
34574f19
MC		 77 hashlen = EVP_MD_size(md);
78
79 if (!WPACKET_init_static_len(&pkt, hkdflabel, sizeof(hkdflabel), 0)
80 || !WPACKET_put_bytes_u16(&pkt, outlen)
81 || !WPACKET_start_sub_packet_u8(&pkt)
82 || !WPACKET_memcpy(&pkt, label_prefix, sizeof(label_prefix) - 1)
83 || !WPACKET_memcpy(&pkt, label, labellen)
84 || !WPACKET_close(&pkt)
a19ae67d 85 || !WPACKET_sub_memcpy_u8(&pkt, data, (data == NULL) ? 0 : datalen)
34574f19
MC		 86 || !WPACKET_get_total_written(&pkt, &hkdflabellen)
87 || !WPACKET_finish(&pkt)) {
32495464 88 EVP_KDF_CTX_free(kctx);
34574f19 89 WPACKET_cleanup(&pkt);
0fb2815b
MC		 90 if (fatal)
91 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_HKDF_EXPAND,
92 ERR_R_INTERNAL_ERROR);
93 else
94 SSLerr(SSL_F_TLS13_HKDF_EXPAND, ERR_R_INTERNAL_ERROR);
34574f19
MC		 95 return 0;
96 }
97
ce3b1bb4
P		 98 *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_MODE, &mode);
99 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
100 (char *)mdname, strlen(mdname) + 1);
101 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
102 (unsigned char *)secret, hashlen);
103 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_INFO,
104 hkdflabel, hkdflabellen);
105 *p++ = OSSL_PARAM_construct_end();
106
107 ret = EVP_KDF_CTX_set_params(kctx, params) <= 0
32495464 108 || EVP_KDF_derive(kctx, out, outlen) <= 0;
34574f19 109
32495464 110 EVP_KDF_CTX_free(kctx);
34574f19 111
0fb2815b
MC		 112 if (ret != 0) {
113 if (fatal)
114 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_HKDF_EXPAND,
115 ERR_R_INTERNAL_ERROR);
116 else
117 SSLerr(SSL_F_TLS13_HKDF_EXPAND, ERR_R_INTERNAL_ERROR);
118 }
f63a17d6 119
34574f19
MC		 120 return ret == 0;
121}
122
34574f19 123/*
f5ca0b04
MC		 124 * Given a |secret| generate a |key| of length |keylen| bytes. Returns 1 on
125 * success 0 on failure.
34574f19 126 */
d49e23ec
MC		 127int tls13_derive_key(SSL *s, const EVP_MD *md, const unsigned char *secret,
128 unsigned char *key, size_t keylen)
34574f19 129{
48102247 130#ifdef CHARSET_EBCDIC
131 static const unsigned char keylabel[] ={ 0x6B, 0x65, 0x79, 0x00 };
132#else
133 static const unsigned char keylabel[] = "key";
134#endif
f5ca0b04 135
d49e23ec 136 return tls13_hkdf_expand(s, md, secret, keylabel, sizeof(keylabel) - 1,
0fb2815b 137 NULL, 0, key, keylen, 1);
34574f19
MC		 138}
139
140/*
f5ca0b04
MC		 141 * Given a |secret| generate an |iv| of length |ivlen| bytes. Returns 1 on
142 * success 0 on failure.
34574f19 143 */
d49e23ec
MC		 144int tls13_derive_iv(SSL *s, const EVP_MD *md, const unsigned char *secret,
145 unsigned char *iv, size_t ivlen)
34574f19 146{
48102247 147#ifdef CHARSET_EBCDIC
148 static const unsigned char ivlabel[] = { 0x69, 0x76, 0x00 };
149#else
150 static const unsigned char ivlabel[] = "iv";
151#endif
f5ca0b04 152
d49e23ec 153 return tls13_hkdf_expand(s, md, secret, ivlabel, sizeof(ivlabel) - 1,
0fb2815b 154 NULL, 0, iv, ivlen, 1);
34574f19
MC		 155}
156
ec15acb6
MC		 157int tls13_derive_finishedkey(SSL *s, const EVP_MD *md,
158 const unsigned char *secret,
159 unsigned char *fin, size_t finlen)
6484776f 160{
48102247 161#ifdef CHARSET_EBCDIC
162 static const unsigned char finishedlabel[] = { 0x66, 0x69, 0x6E, 0x69, 0x73, 0x68, 0x65, 0x64, 0x00 };
163#else
164 static const unsigned char finishedlabel[] = "finished";
165#endif
f5ca0b04 166
ec15acb6 167 return tls13_hkdf_expand(s, md, secret, finishedlabel,
0fb2815b 168 sizeof(finishedlabel) - 1, NULL, 0, fin, finlen, 1);
6484776f
MC		 169}
170
34574f19
MC		 171/*
172 * Given the previous secret |prevsecret| and a new input secret |insecret| of
173 * length |insecretlen|, generate a new secret and store it in the location
f5ca0b04 174 * pointed to by |outsecret|. Returns 1 on success 0 on failure.
34574f19 175 */
ec15acb6
MC		 176int tls13_generate_secret(SSL *s, const EVP_MD *md,
177 const unsigned char *prevsecret,
178 const unsigned char *insecret,
179 size_t insecretlen,
180 unsigned char *outsecret)
34574f19 181{
34574f19 182 size_t mdlen, prevsecretlen;
bceae201 183 int mdleni;
34574f19 184 int ret;
ce3b1bb4
P		 185 EVP_KDF *kdf;
186 EVP_KDF_CTX *kctx;
187 OSSL_PARAM params[5], *p = params;
188 int mode = EVP_PKEY_HKDEF_MODE_EXTRACT_ONLY;
189 const char *mdname = EVP_MD_name(md);
48102247 190#ifdef CHARSET_EBCDIC
191 static const char derived_secret_label[] = { 0x64, 0x65, 0x72, 0x69, 0x76, 0x65, 0x64, 0x00 };
192#else
17aa119e 193 static const char derived_secret_label[] = "derived";
48102247 194#endif
3e0458fb 195 unsigned char preextractsec[EVP_MAX_MD_SIZE];
34574f19 196
ce3b1bb4
P		 197 kdf = EVP_KDF_fetch(NULL, SN_hkdf, NULL);
198 kctx = EVP_KDF_CTX_new(kdf);
199 EVP_KDF_free(kdf);
32495464 200 if (kctx == NULL) {
f63a17d6
MC		 201 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_GENERATE_SECRET,
202 ERR_R_INTERNAL_ERROR);
34574f19 203 return 0;
f63a17d6 204 }
34574f19 205
bceae201
MC		 206 mdleni = EVP_MD_size(md);
207 /* Ensure cast to size_t is safe */
208 if (!ossl_assert(mdleni >= 0)) {
209 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_GENERATE_SECRET,
210 ERR_R_INTERNAL_ERROR);
ad14e8e5 211 EVP_KDF_CTX_free(kctx);
bceae201
MC		 212 return 0;
213 }
214 mdlen = (size_t)mdleni;
34574f19
MC		 215
216 if (insecret == NULL) {
217 insecret = default_zeros;
218 insecretlen = mdlen;
219 }
220 if (prevsecret == NULL) {
221 prevsecret = default_zeros;
222 prevsecretlen = 0;
223 } else {
3e0458fb
MC		 224 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
225 unsigned char hash[EVP_MAX_MD_SIZE];
226
227 /* The pre-extract derive step uses a hash of no messages */
228 if (mctx == NULL
229 || EVP_DigestInit_ex(mctx, md, NULL) <= 0
230 || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) {
f63a17d6
MC		 231 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_GENERATE_SECRET,
232 ERR_R_INTERNAL_ERROR);
3e0458fb 233 EVP_MD_CTX_free(mctx);
32495464 234 EVP_KDF_CTX_free(kctx);
3e0458fb
MC		 235 return 0;
236 }
237 EVP_MD_CTX_free(mctx);
238
239 /* Generate the pre-extract secret */
240 if (!tls13_hkdf_expand(s, md, prevsecret,
241 (unsigned char *)derived_secret_label,
a19ae67d 242 sizeof(derived_secret_label) - 1, hash, mdlen,
0fb2815b 243 preextractsec, mdlen, 1)) {
f63a17d6 244 /* SSLfatal() already called */
32495464 245 EVP_KDF_CTX_free(kctx);
3e0458fb 246 return 0;
71d8c138 247 }
3e0458fb
MC		 248
249 prevsecret = preextractsec;
34574f19
MC		 250 prevsecretlen = mdlen;
251 }
252
ce3b1bb4
P		 253 *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_MODE, &mode);
254 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
255 (char *)mdname, strlen(mdname) + 1);
256 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
257 (unsigned char *)insecret,
258 insecretlen);
259 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
260 (unsigned char *)prevsecret,
261 prevsecretlen);
262 *p++ = OSSL_PARAM_construct_end();
263
264 ret = EVP_KDF_CTX_set_params(kctx, params) <= 0
32495464 265 || EVP_KDF_derive(kctx, outsecret, mdlen) <= 0;
34574f19 266
f63a17d6
MC		 267 if (ret != 0)
268 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_GENERATE_SECRET,
269 ERR_R_INTERNAL_ERROR);
270
32495464 271 EVP_KDF_CTX_free(kctx);
3e0458fb
MC		 272 if (prevsecret == preextractsec)
273 OPENSSL_cleanse(preextractsec, mdlen);
34574f19
MC		 274 return ret == 0;
275}
276
34574f19
MC		 277/*
278 * Given an input secret |insecret| of length |insecretlen| generate the
279 * handshake secret. This requires the early secret to already have been
f5ca0b04 280 * generated. Returns 1 on success 0 on failure.
34574f19
MC		 281 */
282int tls13_generate_handshake_secret(SSL *s, const unsigned char *insecret,
283 size_t insecretlen)
284{
f63a17d6 285 /* Calls SSLfatal() if required */
ec15acb6
MC		 286 return tls13_generate_secret(s, ssl_handshake_md(s), s->early_secret,
287 insecret, insecretlen,
34574f19
MC		 288 (unsigned char *)&s->handshake_secret);
289}
290
291/*
292 * Given the handshake secret |prev| of length |prevlen| generate the master
f5ca0b04
MC		 293 * secret and store its length in |*secret_size|. Returns 1 on success 0 on
294 * failure.
34574f19
MC		 295 */
296int tls13_generate_master_secret(SSL *s, unsigned char *out,
297 unsigned char *prev, size_t prevlen,
298 size_t *secret_size)
299{
ec15acb6
MC		 300 const EVP_MD *md = ssl_handshake_md(s);
301
302 *secret_size = EVP_MD_size(md);
f63a17d6 303 /* Calls SSLfatal() if required */
ec15acb6 304 return tls13_generate_secret(s, md, prev, NULL, 0, out);
34574f19
MC		 305}
306
92760c21 307/*
f5ca0b04
MC		 308 * Generates the mac for the Finished message. Returns the length of the MAC or
309 * 0 on error.
92760c21
MC		 310 */
311size_t tls13_final_finish_mac(SSL *s, const char *str, size_t slen,
312 unsigned char *out)
313{
6484776f
MC		 314 const EVP_MD *md = ssl_handshake_md(s);
315 unsigned char hash[EVP_MAX_MD_SIZE];
316 size_t hashlen, ret = 0;
317 EVP_PKEY *key = NULL;
318 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
92760c21 319
d4d2f3a4
MC		 320 if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
321 /* SSLfatal() already called */
6484776f 322 goto err;
d4d2f3a4 323 }
6484776f 324
de9f5b35 325 if (str == s->method->ssl3_enc->server_finished_label) {
f929439f
MC		 326 key = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL,
327 s->server_finished_secret, hashlen);
de9f5b35 328 } else if (SSL_IS_FIRST_HANDSHAKE(s)) {
f929439f
MC		 329 key = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL,
330 s->client_finished_secret, hashlen);
de9f5b35
MC		 331 } else {
332 unsigned char finsecret[EVP_MAX_MD_SIZE];
333
334 if (!tls13_derive_finishedkey(s, ssl_handshake_md(s),
335 s->client_app_traffic_secret,
336 finsecret, hashlen))
337 goto err;
338
339 key = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL, finsecret,
340 hashlen);
8f39d8af 341 OPENSSL_cleanse(finsecret, sizeof(finsecret));
de9f5b35 342 }
6484776f
MC		 343
344 if (key == NULL
345 || ctx == NULL
346 || EVP_DigestSignInit(ctx, NULL, md, NULL, key) <= 0
347 || EVP_DigestSignUpdate(ctx, hash, hashlen) <= 0
d4d2f3a4
MC		 348 || EVP_DigestSignFinal(ctx, out, &hashlen) <= 0) {
349 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_FINAL_FINISH_MAC,
350 ERR_R_INTERNAL_ERROR);
6484776f 351 goto err;
d4d2f3a4 352 }
92760c21 353
6484776f
MC		 354 ret = hashlen;
355 err:
356 EVP_PKEY_free(key);
357 EVP_MD_CTX_free(ctx);
358 return ret;
92760c21
MC		 359}
360
361/*
362 * There isn't really a key block in TLSv1.3, but we still need this function
f5ca0b04 363 * for initialising the cipher and hash. Returns 1 on success or 0 on failure.
92760c21
MC		 364 */
365int tls13_setup_key_block(SSL *s)
366{
367 const EVP_CIPHER *c;
368 const EVP_MD *hash;
92760c21 369
555cbb32 370 s->session->cipher = s->s3.tmp.new_cipher;
ea09abc8 371 if (!ssl_cipher_get_evp(s->session, &c, &hash, NULL, NULL, NULL, 0)) {
f63a17d6
MC		 372 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_SETUP_KEY_BLOCK,
373 SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
92760c21
MC		 374 return 0;
375 }
376
555cbb32
TS		 377 s->s3.tmp.new_sym_enc = c;
378 s->s3.tmp.new_hash = hash;
92760c21
MC		 379
380 return 1;
381}
382
d1186c30 383static int derive_secret_key_and_iv(SSL *s, int sending, const EVP_MD *md,
d49e23ec 384 const EVP_CIPHER *ciph,
57389a32
MC		 385 const unsigned char *insecret,
386 const unsigned char *hash,
387 const unsigned char *label,
388 size_t labellen, unsigned char *secret,
389 unsigned char *iv, EVP_CIPHER_CTX *ciph_ctx)
390{
391 unsigned char key[EVP_MAX_KEY_LENGTH];
392 size_t ivlen, keylen, taglen;
bceae201
MC		 393 int hashleni = EVP_MD_size(md);
394 size_t hashlen;
395
396 /* Ensure cast to size_t is safe */
397 if (!ossl_assert(hashleni >= 0)) {
398 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DERIVE_SECRET_KEY_AND_IV,
399 ERR_R_EVP_LIB);
400 goto err;
401 }
402 hashlen = (size_t)hashleni;
57389a32 403
a19ae67d 404 if (!tls13_hkdf_expand(s, md, insecret, label, labellen, hash, hashlen,
0fb2815b 405 secret, hashlen, 1)) {
f63a17d6 406 /* SSLfatal() already called */
57389a32
MC		 407 goto err;
408 }
409
410 /* TODO(size_t): convert me */
411 keylen = EVP_CIPHER_key_length(ciph);
412 if (EVP_CIPHER_mode(ciph) == EVP_CIPH_CCM_MODE) {
c117af67
MC		 413 uint32_t algenc;
414
57389a32 415 ivlen = EVP_CCM_TLS_IV_LEN;
555cbb32 416 if (s->s3.tmp.new_cipher == NULL) {
c117af67
MC		 417 /* We've not selected a cipher yet - we must be doing early data */
418 algenc = s->session->cipher->algorithm_enc;
419 } else {
555cbb32 420 algenc = s->s3.tmp.new_cipher->algorithm_enc;
c117af67
MC		 421 }
422 if (algenc & (SSL_AES128CCM8 | SSL_AES256CCM8))
57389a32
MC		 423 taglen = EVP_CCM8_TLS_TAG_LEN;
424 else
425 taglen = EVP_CCM_TLS_TAG_LEN;
426 } else {
427 ivlen = EVP_CIPHER_iv_length(ciph);
428 taglen = 0;
429 }
430
d49e23ec
MC		 431 if (!tls13_derive_key(s, md, secret, key, keylen)
432 || !tls13_derive_iv(s, md, secret, iv, ivlen)) {
f63a17d6 433 /* SSLfatal() already called */
57389a32
MC		 434 goto err;
435 }
436
d1186c30 437 if (EVP_CipherInit_ex(ciph_ctx, ciph, NULL, NULL, NULL, sending) <= 0
57389a32
MC		 438 || !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_IVLEN, ivlen, NULL)
439 || (taglen != 0 && !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_TAG,
440 taglen, NULL))
441 || EVP_CipherInit_ex(ciph_ctx, NULL, NULL, key, NULL, -1) <= 0) {
f63a17d6
MC		 442 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DERIVE_SECRET_KEY_AND_IV,
443 ERR_R_EVP_LIB);
57389a32
MC		 444 goto err;
445 }
446
57389a32
MC		 447 return 1;
448 err:
449 OPENSSL_cleanse(key, sizeof(key));
450 return 0;
451}
452
0d9824c1
MC		 453int tls13_change_cipher_state(SSL *s, int which)
454{
48102247 455#ifdef CHARSET_EBCDIC
456 static const unsigned char client_early_traffic[] = {0x63, 0x20, 0x65, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
457 static const unsigned char client_handshake_traffic[] = {0x63, 0x20, 0x68, 0x73, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
458 static const unsigned char client_application_traffic[] = {0x63, 0x20, 0x61, 0x70, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
459 static const unsigned char server_handshake_traffic[] = {0x73, 0x20, 0x68, 0x73, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
460 static const unsigned char server_application_traffic[] = {0x73, 0x20, 0x61, 0x70, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
461 static const unsigned char exporter_master_secret[] = {0x65, 0x78, 0x70, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00};
462 static const unsigned char resumption_master_secret[] = {0x72, 0x65, 0x73, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00};
463 static const unsigned char early_exporter_master_secret[] = {0x65, 0x20, 0x65, 0x78, 0x70, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00};
464#else
17aa119e
MC		 465 static const unsigned char client_early_traffic[] = "c e traffic";
466 static const unsigned char client_handshake_traffic[] = "c hs traffic";
467 static const unsigned char client_application_traffic[] = "c ap traffic";
468 static const unsigned char server_handshake_traffic[] = "s hs traffic";
469 static const unsigned char server_application_traffic[] = "s ap traffic";
0ca8d1ec 470 static const unsigned char exporter_master_secret[] = "exp master";
17aa119e 471 static const unsigned char resumption_master_secret[] = "res master";
b38ede80 472 static const unsigned char early_exporter_master_secret[] = "e exp master";
48102247 473#endif
bebc0c7d 474 unsigned char *iv;
0d9824c1 475 unsigned char secret[EVP_MAX_MD_SIZE];
ace081c1
MC		 476 unsigned char hashval[EVP_MAX_MD_SIZE];
477 unsigned char *hash = hashval;
0d9824c1 478 unsigned char *insecret;
6484776f 479 unsigned char *finsecret = NULL;
2c7bd692 480 const char *log_label = NULL;
0d9824c1 481 EVP_CIPHER_CTX *ciph_ctx;
57389a32 482 size_t finsecretlen = 0;
0d9824c1 483 const unsigned char *label;
ace081c1 484 size_t labellen, hashlen = 0;
6530c490 485 int ret = 0;
42f50fdf
MC		 486 const EVP_MD *md = NULL;
487 const EVP_CIPHER *cipher = NULL;
0d9824c1
MC		 488
489 if (which & SSL3_CC_READ) {
490 if (s->enc_read_ctx != NULL) {
491 EVP_CIPHER_CTX_reset(s->enc_read_ctx);
492 } else {
493 s->enc_read_ctx = EVP_CIPHER_CTX_new();
494 if (s->enc_read_ctx == NULL) {
f63a17d6
MC		 495 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
496 SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
0d9824c1
MC		 497 goto err;
498 }
499 }
500 ciph_ctx = s->enc_read_ctx;
bebc0c7d 501 iv = s->read_iv;
0d9824c1
MC		 502
503 RECORD_LAYER_reset_read_sequence(&s->rlayer);
504 } else {
7426cd34 505 s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
0d9824c1
MC		 506 if (s->enc_write_ctx != NULL) {
507 EVP_CIPHER_CTX_reset(s->enc_write_ctx);
508 } else {
509 s->enc_write_ctx = EVP_CIPHER_CTX_new();
510 if (s->enc_write_ctx == NULL) {
f63a17d6
MC		 511 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
512 SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
0d9824c1
MC		 513 goto err;
514 }
515 }
516 ciph_ctx = s->enc_write_ctx;
bebc0c7d 517 iv = s->write_iv;
0d9824c1
MC		 518
519 RECORD_LAYER_reset_write_sequence(&s->rlayer);
520 }
521
522 if (((which & SSL3_CC_CLIENT) && (which & SSL3_CC_WRITE))
523 || ((which & SSL3_CC_SERVER) && (which & SSL3_CC_READ))) {
d49e23ec
MC		 524 if (which & SSL3_CC_EARLY) {
525 EVP_MD_CTX *mdctx = NULL;
526 long handlen;
527 void *hdata;
528 unsigned int hashlenui;
529 const SSL_CIPHER *sslcipher = SSL_SESSION_get0_cipher(s->session);
530
531 insecret = s->early_secret;
532 label = client_early_traffic;
533 labellen = sizeof(client_early_traffic) - 1;
534 log_label = CLIENT_EARLY_LABEL;
535
555cbb32 536 handlen = BIO_get_mem_data(s->s3.handshake_buffer, &hdata);
d49e23ec 537 if (handlen <= 0) {
f63a17d6
MC		 538 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
539 SSL_F_TLS13_CHANGE_CIPHER_STATE,
540 SSL_R_BAD_HANDSHAKE_LENGTH);
d49e23ec
MC		 541 goto err;
542 }
add8d0e9 543
08717544
MC		 544 if (s->early_data_state == SSL_EARLY_DATA_CONNECTING
545 && s->max_early_data > 0
546 && s->session->ext.max_early_data == 0) {
547 /*
548 * If we are attempting to send early data, and we've decided to
549 * actually do it but max_early_data in s->session is 0 then we
550 * must be using an external PSK.
551 */
552 if (!ossl_assert(s->psksession != NULL
553 && s->max_early_data ==
554 s->psksession->ext.max_early_data)) {
f63a17d6
MC		 555 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
556 SSL_F_TLS13_CHANGE_CIPHER_STATE,
557 ERR_R_INTERNAL_ERROR);
08717544
MC		 558 goto err;
559 }
add8d0e9 560 sslcipher = SSL_SESSION_get0_cipher(s->psksession);
08717544 561 }
d49e23ec 562 if (sslcipher == NULL) {
f63a17d6
MC		 563 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
564 SSL_F_TLS13_CHANGE_CIPHER_STATE, SSL_R_BAD_PSK);
d49e23ec
MC		 565 goto err;
566 }
567
568 /*
569 * We need to calculate the handshake digest using the digest from
570 * the session. We haven't yet selected our ciphersuite so we can't
571 * use ssl_handshake_md().
572 */
573 mdctx = EVP_MD_CTX_new();
574 if (mdctx == NULL) {
f63a17d6
MC		 575 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
576 SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
d49e23ec
MC		 577 goto err;
578 }
579 cipher = EVP_get_cipherbynid(SSL_CIPHER_get_cipher_nid(sslcipher));
580 md = ssl_md(sslcipher->algorithm2);
581 if (md == NULL || !EVP_DigestInit_ex(mdctx, md, NULL)
582 || !EVP_DigestUpdate(mdctx, hdata, handlen)
583 || !EVP_DigestFinal_ex(mdctx, hashval, &hashlenui)) {
f63a17d6
MC		 584 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
585 SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
d49e23ec
MC		 586 EVP_MD_CTX_free(mdctx);
587 goto err;
588 }
589 hashlen = hashlenui;
590 EVP_MD_CTX_free(mdctx);
b38ede80
TT		 591
592 if (!tls13_hkdf_expand(s, md, insecret,
593 early_exporter_master_secret,
594 sizeof(early_exporter_master_secret) - 1,
595 hashval, hashlen,
0fb2815b
MC		 596 s->early_exporter_master_secret, hashlen,
597 1)) {
b38ede80
TT		 598 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
599 SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
600 goto err;
601 }
01a2a654
PW		 602
603 if (!ssl_log_secret(s, EARLY_EXPORTER_SECRET_LABEL,
604 s->early_exporter_master_secret, hashlen)) {
605 /* SSLfatal() already called */
606 goto err;
607 }
d49e23ec 608 } else if (which & SSL3_CC_HANDSHAKE) {
0d9824c1 609 insecret = s->handshake_secret;
6484776f 610 finsecret = s->client_finished_secret;
6612d87b 611 finsecretlen = EVP_MD_size(ssl_handshake_md(s));
0d9824c1
MC		 612 label = client_handshake_traffic;
613 labellen = sizeof(client_handshake_traffic) - 1;
2c7bd692 614 log_label = CLIENT_HANDSHAKE_LABEL;
fe5e20fd 615 /*
69687aa8 616 * The handshake hash used for the server read/client write handshake
f7e393be
MC		 617 * traffic secret is the same as the hash for the server
618 * write/client read handshake traffic secret. However, if we
619 * processed early data then we delay changing the server
620 * read/client write cipher state until later, and the handshake
621 * hashes have moved on. Therefore we use the value saved earlier
622 * when we did the server write/client read change cipher state.
fe5e20fd 623 */
f7e393be 624 hash = s->handshake_traffic_hash;
0d9824c1 625 } else {
ec15acb6 626 insecret = s->master_secret;
0d9824c1
MC		 627 label = client_application_traffic;
628 labellen = sizeof(client_application_traffic) - 1;
2c7bd692 629 log_label = CLIENT_APPLICATION_LABEL;
ace081c1
MC		 630 /*
631 * For this we only use the handshake hashes up until the server
632 * Finished hash. We do not include the client's Finished, which is
633 * what ssl_handshake_hash() would give us. Instead we use the
634 * previously saved value.
635 */
636 hash = s->server_finished_hash;
0d9824c1
MC		 637 }
638 } else {
d49e23ec 639 /* Early data never applies to client-read/server-write */
0d9824c1
MC		 640 if (which & SSL3_CC_HANDSHAKE) {
641 insecret = s->handshake_secret;
6484776f 642 finsecret = s->server_finished_secret;
6612d87b 643 finsecretlen = EVP_MD_size(ssl_handshake_md(s));
0d9824c1
MC		 644 label = server_handshake_traffic;
645 labellen = sizeof(server_handshake_traffic) - 1;
2c7bd692 646 log_label = SERVER_HANDSHAKE_LABEL;
0d9824c1 647 } else {
ec15acb6 648 insecret = s->master_secret;
0d9824c1
MC		 649 label = server_application_traffic;
650 labellen = sizeof(server_application_traffic) - 1;
2c7bd692 651 log_label = SERVER_APPLICATION_LABEL;
0d9824c1
MC		 652 }
653 }
654
d49e23ec
MC		 655 if (!(which & SSL3_CC_EARLY)) {
656 md = ssl_handshake_md(s);
555cbb32 657 cipher = s->s3.tmp.new_sym_enc;
d49e23ec
MC		 658 if (!ssl3_digest_cached_records(s, 1)
659 || !ssl_handshake_hash(s, hashval, sizeof(hashval), &hashlen)) {
f63a17d6 660 /* SSLfatal() already called */;
d49e23ec
MC		 661 goto err;
662 }
ace081c1
MC		 663 }
664
ec15acb6
MC		 665 /*
666 * Save the hash of handshakes up to now for use when we calculate the
667 * client application traffic secret
668 */
669 if (label == server_application_traffic)
670 memcpy(s->server_finished_hash, hashval, hashlen);
671
f7e393be 672 if (label == server_handshake_traffic)
fe5e20fd
MC		 673 memcpy(s->handshake_traffic_hash, hashval, hashlen);
674
ec15acb6
MC		 675 if (label == client_application_traffic) {
676 /*
677 * We also create the resumption master secret, but this time use the
678 * hash for the whole handshake including the Client Finished
679 */
680 if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
681 resumption_master_secret,
682 sizeof(resumption_master_secret) - 1,
4ff1a526 683 hashval, hashlen, s->resumption_master_secret,
0fb2815b 684 hashlen, 1)) {
f63a17d6 685 /* SSLfatal() already called */
ec15acb6
MC		 686 goto err;
687 }
ec15acb6
MC		 688 }
689
d49e23ec
MC		 690 if (!derive_secret_key_and_iv(s, which & SSL3_CC_WRITE, md, cipher,
691 insecret, hash, label, labellen, secret, iv,
692 ciph_ctx)) {
f63a17d6 693 /* SSLfatal() already called */
57389a32 694 goto err;
ec07b1d8 695 }
0d9824c1 696
2221ec10 697 if (label == server_application_traffic) {
57389a32 698 memcpy(s->server_app_traffic_secret, secret, hashlen);
2221ec10
TT		 699 /* Now we create the exporter master secret */
700 if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
701 exporter_master_secret,
702 sizeof(exporter_master_secret) - 1,
703 hash, hashlen, s->exporter_master_secret,
0fb2815b 704 hashlen, 1)) {
2221ec10
TT		 705 /* SSLfatal() already called */
706 goto err;
707 }
6329ce8f
PW		 708
709 if (!ssl_log_secret(s, EXPORTER_SECRET_LABEL, s->exporter_master_secret,
710 hashlen)) {
711 /* SSLfatal() already called */
712 goto err;
713 }
2221ec10 714 } else if (label == client_application_traffic)
57389a32
MC		 715 memcpy(s->client_app_traffic_secret, secret, hashlen);
716
2c7bd692 717 if (!ssl_log_secret(s, log_label, secret, hashlen)) {
f63a17d6 718 /* SSLfatal() already called */
2c7bd692
CB		 719 goto err;
720 }
721
57389a32
MC		 722 if (finsecret != NULL
723 && !tls13_derive_finishedkey(s, ssl_handshake_md(s), secret,
724 finsecret, finsecretlen)) {
f63a17d6 725 /* SSLfatal() already called */
0d9824c1
MC		 726 goto err;
727 }
728
7426cd34
MC		 729 if (!s->server && label == client_early_traffic)
730 s->statem.enc_write_state = ENC_WRITE_STATE_WRITE_PLAIN_ALERTS;
731 else
732 s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
57389a32
MC		 733 ret = 1;
734 err:
735 OPENSSL_cleanse(secret, sizeof(secret));
736 return ret;
737}
0d9824c1 738
d1186c30 739int tls13_update_key(SSL *s, int sending)
57389a32 740{
48102247 741#ifdef CHARSET_EBCDIC
742 static const unsigned char application_traffic[] = { 0x74, 0x72 ,0x61 ,0x66 ,0x66 ,0x69 ,0x63 ,0x20 ,0x75 ,0x70 ,0x64, 0x00};
743#else
744 static const unsigned char application_traffic[] = "traffic upd";
745#endif
57389a32
MC		 746 const EVP_MD *md = ssl_handshake_md(s);
747 size_t hashlen = EVP_MD_size(md);
748 unsigned char *insecret, *iv;
749 unsigned char secret[EVP_MAX_MD_SIZE];
750 EVP_CIPHER_CTX *ciph_ctx;
751 int ret = 0;
0d9824c1 752
d1186c30 753 if (s->server == sending)
57389a32
MC		 754 insecret = s->server_app_traffic_secret;
755 else
756 insecret = s->client_app_traffic_secret;
bebc0c7d 757
d1186c30 758 if (sending) {
7426cd34 759 s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
57389a32
MC		 760 iv = s->write_iv;
761 ciph_ctx = s->enc_write_ctx;
762 RECORD_LAYER_reset_write_sequence(&s->rlayer);
763 } else {
764 iv = s->read_iv;
765 ciph_ctx = s->enc_read_ctx;
766 RECORD_LAYER_reset_read_sequence(&s->rlayer);
0d9824c1 767 }
57389a32 768
d1186c30 769 if (!derive_secret_key_and_iv(s, sending, ssl_handshake_md(s),
555cbb32 770 s->s3.tmp.new_sym_enc, insecret, NULL,
d49e23ec 771 application_traffic,
57389a32 772 sizeof(application_traffic) - 1, secret, iv,
f63a17d6
MC		 773 ciph_ctx)) {
774 /* SSLfatal() already called */
57389a32 775 goto err;
f63a17d6 776 }
57389a32
MC		 777
778 memcpy(insecret, secret, hashlen);
0d9824c1 779
7426cd34 780 s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
6530c490 781 ret = 1;
0d9824c1
MC		 782 err:
783 OPENSSL_cleanse(secret, sizeof(secret));
6530c490 784 return ret;
0d9824c1 785}
04904312
MC		 786
787int tls13_alert_code(int code)
788{
43a0f273
MC		 789 /* There are 2 additional alerts in TLSv1.3 compared to TLSv1.2 */
790 if (code == SSL_AD_MISSING_EXTENSION || code == SSL_AD_CERTIFICATE_REQUIRED)
04904312
MC		 791 return code;
792
793 return tls1_alert_code(code);
794}
0ca8d1ec
MC		 795
796int tls13_export_keying_material(SSL *s, unsigned char *out, size_t olen,
797 const char *label, size_t llen,
798 const unsigned char *context,
799 size_t contextlen, int use_context)
800{
801 unsigned char exportsecret[EVP_MAX_MD_SIZE];
48102247 802#ifdef CHARSET_EBCDIC
803 static const unsigned char exporterlabel[] = {0x65, 0x78, 0x70, 0x6F, 0x72, 0x74, 0x65, 0x72, 0x00};
804#else
0ca8d1ec 805 static const unsigned char exporterlabel[] = "exporter";
48102247 806#endif
c8b93876 807 unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
0ca8d1ec
MC		 808 const EVP_MD *md = ssl_handshake_md(s);
809 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
c8b93876 810 unsigned int hashsize, datalen;
0ca8d1ec
MC		 811 int ret = 0;
812
1f5878b8 813 if (ctx == NULL || !ossl_statem_export_allowed(s))
0ca8d1ec
MC		 814 goto err;
815
816 if (!use_context)
817 contextlen = 0;
818
819 if (EVP_DigestInit_ex(ctx, md, NULL) <= 0
820 || EVP_DigestUpdate(ctx, context, contextlen) <= 0
821 || EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
c8b93876
TT		 822 || EVP_DigestInit_ex(ctx, md, NULL) <= 0
823 || EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
0ca8d1ec 824 || !tls13_hkdf_expand(s, md, s->exporter_master_secret,
c8b93876 825 (const unsigned char *)label, llen,
0fb2815b 826 data, datalen, exportsecret, hashsize, 0)
0ca8d1ec 827 || !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
a19ae67d 828 sizeof(exporterlabel) - 1, hash, hashsize,
0fb2815b 829 out, olen, 0))
0ca8d1ec
MC		 830 goto err;
831
832 ret = 1;
833 err:
834 EVP_MD_CTX_free(ctx);
835 return ret;
836}
b38ede80
TT		 837
838int tls13_export_keying_material_early(SSL *s, unsigned char *out, size_t olen,
839 const char *label, size_t llen,
840 const unsigned char *context,
841 size_t contextlen)
842{
48102247 843#ifdef CHARSET_EBCDIC
844 static const unsigned char exporterlabel[] = {0x65, 0x78, 0x70, 0x6F, 0x72, 0x74, 0x65, 0x72, 0x00};
845#else
846 static const unsigned char exporterlabel[] = "exporter";
847#endif
b38ede80
TT		 848 unsigned char exportsecret[EVP_MAX_MD_SIZE];
849 unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
850 const EVP_MD *md;
851 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
852 unsigned int hashsize, datalen;
853 int ret = 0;
854 const SSL_CIPHER *sslcipher;
855
856 if (ctx == NULL || !ossl_statem_export_early_allowed(s))
857 goto err;
858
859 if (!s->server && s->max_early_data > 0
860 && s->session->ext.max_early_data == 0)
861 sslcipher = SSL_SESSION_get0_cipher(s->psksession);
862 else
863 sslcipher = SSL_SESSION_get0_cipher(s->session);
864
865 md = ssl_md(sslcipher->algorithm2);
866
867 /*
868 * Calculate the hash value and store it in |data|. The reason why
869 * the empty string is used is that the definition of TLS-Exporter
870 * is like so:
871 *
872 * TLS-Exporter(label, context_value, key_length) =
873 * HKDF-Expand-Label(Derive-Secret(Secret, label, ""),
874 * "exporter", Hash(context_value), key_length)
875 *
876 * Derive-Secret(Secret, Label, Messages) =
877 * HKDF-Expand-Label(Secret, Label,
878 * Transcript-Hash(Messages), Hash.length)
879 *
880 * Here Transcript-Hash is the cipher suite hash algorithm.
881 */
882 if (EVP_DigestInit_ex(ctx, md, NULL) <= 0
883 || EVP_DigestUpdate(ctx, context, contextlen) <= 0
884 || EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
885 || EVP_DigestInit_ex(ctx, md, NULL) <= 0
886 || EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
887 || !tls13_hkdf_expand(s, md, s->early_exporter_master_secret,
888 (const unsigned char *)label, llen,
0fb2815b 889 data, datalen, exportsecret, hashsize, 0)
b38ede80
TT		 890 || !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
891 sizeof(exporterlabel) - 1, hash, hashsize,
0fb2815b 892 out, olen, 0))
b38ede80
TT		 893 goto err;
894
895 ret = 1;
896 err:
897 EVP_MD_CTX_free(ctx);
898 return ret;
899}
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