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34574f19 | 1 | /* |
fecb3aae | 2 | * Copyright 2016-2022 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> | |
706457b7 | 11 | #include "ssl_local.h" |
cc10b56d VF |
12 | #include "internal/ktls.h" |
13 | #include "record/record_local.h" | |
08717544 | 14 | #include "internal/cryptlib.h" |
34574f19 MC |
15 | #include <openssl/evp.h> |
16 | #include <openssl/kdf.h> | |
ce3b1bb4 | 17 | #include <openssl/core_names.h> |
34574f19 | 18 | |
0fb2815b | 19 | #define TLS13_MAX_LABEL_LEN 249 |
34574f19 | 20 | |
f7d998a2 P |
21 | #ifdef CHARSET_EBCDIC |
22 | static const unsigned char label_prefix[] = { 0x74, 0x6C, 0x73, 0x31, 0x33, 0x20, 0x00 }; | |
23 | #else | |
24 | static const unsigned char label_prefix[] = "tls13 "; | |
25 | #endif | |
34574f19 | 26 | |
34574f19 | 27 | /* |
a19ae67d MC |
28 | * Given a |secret|; a |label| of length |labellen|; and |data| of length |
29 | * |datalen| (e.g. typically a hash of the handshake messages), derive a new | |
30 | * secret |outlen| bytes long and store it in the location pointed to be |out|. | |
0fb2815b MC |
31 | * The |data| value may be zero length. Any errors will be treated as fatal if |
32 | * |fatal| is set. Returns 1 on success 0 on failure. | |
34574f19 | 33 | */ |
ec15acb6 | 34 | int tls13_hkdf_expand(SSL *s, const EVP_MD *md, const unsigned char *secret, |
1b9e4678 DB |
35 | const unsigned char *label, size_t labellen, |
36 | const unsigned char *data, size_t datalen, | |
37 | unsigned char *out, size_t outlen, int fatal) | |
34574f19 | 38 | { |
f7d998a2 | 39 | EVP_KDF *kdf = EVP_KDF_fetch(s->ctx->libctx, OSSL_KDF_NAME_TLS1_3_KDF, |
c8f6c28a | 40 | s->ctx->propq); |
ce3b1bb4 | 41 | EVP_KDF_CTX *kctx; |
f7d998a2 | 42 | OSSL_PARAM params[7], *p = params; |
ce3b1bb4 | 43 | int mode = EVP_PKEY_HKDEF_MODE_EXPAND_ONLY; |
ed576acd | 44 | const char *mdname = EVP_MD_get0_name(md); |
34574f19 | 45 | int ret; |
34574f19 | 46 | size_t hashlen; |
34574f19 | 47 | |
660c5344 | 48 | kctx = EVP_KDF_CTX_new(kdf); |
ce3b1bb4 | 49 | EVP_KDF_free(kdf); |
32495464 | 50 | if (kctx == NULL) |
34574f19 MC |
51 | return 0; |
52 | ||
0fb2815b MC |
53 | if (labellen > TLS13_MAX_LABEL_LEN) { |
54 | if (fatal) { | |
c48ffbcc | 55 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
0fb2815b MC |
56 | } else { |
57 | /* | |
58 | * Probably we have been called from SSL_export_keying_material(), | |
59 | * or SSL_export_keying_material_early(). | |
60 | */ | |
6849b73c | 61 | ERR_raise(ERR_LIB_SSL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL); |
0fb2815b | 62 | } |
660c5344 | 63 | EVP_KDF_CTX_free(kctx); |
0fb2815b MC |
64 | return 0; |
65 | } | |
66 | ||
f7d998a2 | 67 | if ((ret = EVP_MD_get_size(md)) <= 0) { |
660c5344 | 68 | EVP_KDF_CTX_free(kctx); |
0fb2815b | 69 | if (fatal) |
c48ffbcc | 70 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
0fb2815b | 71 | else |
6849b73c | 72 | ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR); |
34574f19 MC |
73 | return 0; |
74 | } | |
f7d998a2 | 75 | hashlen = (size_t)ret; |
34574f19 | 76 | |
ce3b1bb4 P |
77 | *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_MODE, &mode); |
78 | *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST, | |
8b6ffd40 | 79 | (char *)mdname, 0); |
ce3b1bb4 P |
80 | *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY, |
81 | (unsigned char *)secret, hashlen); | |
f7d998a2 P |
82 | *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PREFIX, |
83 | (unsigned char *)label_prefix, | |
84 | sizeof(label_prefix) - 1); | |
85 | *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_LABEL, | |
86 | (unsigned char *)label, labellen); | |
87 | if (data != NULL) | |
88 | *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_DATA, | |
89 | (unsigned char *)data, | |
90 | datalen); | |
ce3b1bb4 P |
91 | *p++ = OSSL_PARAM_construct_end(); |
92 | ||
5cceedb5 | 93 | ret = EVP_KDF_derive(kctx, out, outlen, params) <= 0; |
660c5344 | 94 | EVP_KDF_CTX_free(kctx); |
34574f19 | 95 | |
0fb2815b MC |
96 | if (ret != 0) { |
97 | if (fatal) | |
c48ffbcc | 98 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
0fb2815b | 99 | else |
6849b73c | 100 | ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR); |
0fb2815b | 101 | } |
f63a17d6 | 102 | |
34574f19 MC |
103 | return ret == 0; |
104 | } | |
105 | ||
34574f19 | 106 | /* |
f5ca0b04 MC |
107 | * Given a |secret| generate a |key| of length |keylen| bytes. Returns 1 on |
108 | * success 0 on failure. | |
34574f19 | 109 | */ |
d49e23ec MC |
110 | int tls13_derive_key(SSL *s, const EVP_MD *md, const unsigned char *secret, |
111 | unsigned char *key, size_t keylen) | |
34574f19 | 112 | { |
48102247 | 113 | #ifdef CHARSET_EBCDIC |
114 | static const unsigned char keylabel[] ={ 0x6B, 0x65, 0x79, 0x00 }; | |
115 | #else | |
116 | static const unsigned char keylabel[] = "key"; | |
117 | #endif | |
f5ca0b04 | 118 | |
d49e23ec | 119 | return tls13_hkdf_expand(s, md, secret, keylabel, sizeof(keylabel) - 1, |
0fb2815b | 120 | NULL, 0, key, keylen, 1); |
34574f19 MC |
121 | } |
122 | ||
123 | /* | |
f5ca0b04 MC |
124 | * Given a |secret| generate an |iv| of length |ivlen| bytes. Returns 1 on |
125 | * success 0 on failure. | |
34574f19 | 126 | */ |
d49e23ec MC |
127 | int tls13_derive_iv(SSL *s, const EVP_MD *md, const unsigned char *secret, |
128 | unsigned char *iv, size_t ivlen) | |
34574f19 | 129 | { |
48102247 | 130 | #ifdef CHARSET_EBCDIC |
131 | static const unsigned char ivlabel[] = { 0x69, 0x76, 0x00 }; | |
132 | #else | |
133 | static const unsigned char ivlabel[] = "iv"; | |
134 | #endif | |
f5ca0b04 | 135 | |
d49e23ec | 136 | return tls13_hkdf_expand(s, md, secret, ivlabel, sizeof(ivlabel) - 1, |
0fb2815b | 137 | NULL, 0, iv, ivlen, 1); |
34574f19 MC |
138 | } |
139 | ||
ec15acb6 MC |
140 | int tls13_derive_finishedkey(SSL *s, const EVP_MD *md, |
141 | const unsigned char *secret, | |
142 | unsigned char *fin, size_t finlen) | |
6484776f | 143 | { |
48102247 | 144 | #ifdef CHARSET_EBCDIC |
145 | static const unsigned char finishedlabel[] = { 0x66, 0x69, 0x6E, 0x69, 0x73, 0x68, 0x65, 0x64, 0x00 }; | |
146 | #else | |
147 | static const unsigned char finishedlabel[] = "finished"; | |
148 | #endif | |
f5ca0b04 | 149 | |
ec15acb6 | 150 | return tls13_hkdf_expand(s, md, secret, finishedlabel, |
0fb2815b | 151 | sizeof(finishedlabel) - 1, NULL, 0, fin, finlen, 1); |
6484776f MC |
152 | } |
153 | ||
34574f19 MC |
154 | /* |
155 | * Given the previous secret |prevsecret| and a new input secret |insecret| of | |
156 | * length |insecretlen|, generate a new secret and store it in the location | |
f5ca0b04 | 157 | * pointed to by |outsecret|. Returns 1 on success 0 on failure. |
34574f19 | 158 | */ |
ec15acb6 MC |
159 | int tls13_generate_secret(SSL *s, const EVP_MD *md, |
160 | const unsigned char *prevsecret, | |
161 | const unsigned char *insecret, | |
162 | size_t insecretlen, | |
163 | unsigned char *outsecret) | |
34574f19 | 164 | { |
f7d998a2 | 165 | size_t mdlen; |
bceae201 | 166 | int mdleni; |
34574f19 | 167 | int ret; |
ce3b1bb4 P |
168 | EVP_KDF *kdf; |
169 | EVP_KDF_CTX *kctx; | |
f7d998a2 | 170 | OSSL_PARAM params[7], *p = params; |
ce3b1bb4 | 171 | int mode = EVP_PKEY_HKDEF_MODE_EXTRACT_ONLY; |
ed576acd | 172 | const char *mdname = EVP_MD_get0_name(md); |
48102247 | 173 | #ifdef CHARSET_EBCDIC |
174 | static const char derived_secret_label[] = { 0x64, 0x65, 0x72, 0x69, 0x76, 0x65, 0x64, 0x00 }; | |
175 | #else | |
17aa119e | 176 | static const char derived_secret_label[] = "derived"; |
48102247 | 177 | #endif |
34574f19 | 178 | |
f7d998a2 | 179 | kdf = EVP_KDF_fetch(s->ctx->libctx, OSSL_KDF_NAME_TLS1_3_KDF, s->ctx->propq); |
660c5344 | 180 | kctx = EVP_KDF_CTX_new(kdf); |
ce3b1bb4 | 181 | EVP_KDF_free(kdf); |
32495464 | 182 | if (kctx == NULL) { |
c48ffbcc | 183 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
34574f19 | 184 | return 0; |
f63a17d6 | 185 | } |
34574f19 | 186 | |
ed576acd | 187 | mdleni = EVP_MD_get_size(md); |
bceae201 MC |
188 | /* Ensure cast to size_t is safe */ |
189 | if (!ossl_assert(mdleni >= 0)) { | |
c48ffbcc | 190 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
660c5344 | 191 | EVP_KDF_CTX_free(kctx); |
bceae201 MC |
192 | return 0; |
193 | } | |
194 | mdlen = (size_t)mdleni; | |
34574f19 | 195 | |
ce3b1bb4 P |
196 | *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_MODE, &mode); |
197 | *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST, | |
8b6ffd40 | 198 | (char *)mdname, 0); |
f7d998a2 P |
199 | if (insecret != NULL) |
200 | *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY, | |
201 | (unsigned char *)insecret, | |
202 | insecretlen); | |
203 | if (prevsecret != NULL) | |
204 | *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT, | |
205 | (unsigned char *)prevsecret, mdlen); | |
206 | *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PREFIX, | |
207 | (unsigned char *)label_prefix, | |
208 | sizeof(label_prefix) - 1); | |
209 | *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_LABEL, | |
210 | (unsigned char *)derived_secret_label, | |
211 | sizeof(derived_secret_label) - 1); | |
ce3b1bb4 P |
212 | *p++ = OSSL_PARAM_construct_end(); |
213 | ||
5cceedb5 | 214 | ret = EVP_KDF_derive(kctx, outsecret, mdlen, params) <= 0; |
34574f19 | 215 | |
f63a17d6 | 216 | if (ret != 0) |
c48ffbcc | 217 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 | 218 | |
660c5344 | 219 | EVP_KDF_CTX_free(kctx); |
34574f19 MC |
220 | return ret == 0; |
221 | } | |
222 | ||
34574f19 MC |
223 | /* |
224 | * Given an input secret |insecret| of length |insecretlen| generate the | |
225 | * handshake secret. This requires the early secret to already have been | |
f5ca0b04 | 226 | * generated. Returns 1 on success 0 on failure. |
34574f19 MC |
227 | */ |
228 | int tls13_generate_handshake_secret(SSL *s, const unsigned char *insecret, | |
229 | size_t insecretlen) | |
230 | { | |
f63a17d6 | 231 | /* Calls SSLfatal() if required */ |
ec15acb6 MC |
232 | return tls13_generate_secret(s, ssl_handshake_md(s), s->early_secret, |
233 | insecret, insecretlen, | |
34574f19 MC |
234 | (unsigned char *)&s->handshake_secret); |
235 | } | |
236 | ||
237 | /* | |
238 | * Given the handshake secret |prev| of length |prevlen| generate the master | |
f5ca0b04 MC |
239 | * secret and store its length in |*secret_size|. Returns 1 on success 0 on |
240 | * failure. | |
34574f19 MC |
241 | */ |
242 | int tls13_generate_master_secret(SSL *s, unsigned char *out, | |
243 | unsigned char *prev, size_t prevlen, | |
244 | size_t *secret_size) | |
245 | { | |
ec15acb6 MC |
246 | const EVP_MD *md = ssl_handshake_md(s); |
247 | ||
ed576acd | 248 | *secret_size = EVP_MD_get_size(md); |
f63a17d6 | 249 | /* Calls SSLfatal() if required */ |
ec15acb6 | 250 | return tls13_generate_secret(s, md, prev, NULL, 0, out); |
34574f19 MC |
251 | } |
252 | ||
92760c21 | 253 | /* |
f5ca0b04 MC |
254 | * Generates the mac for the Finished message. Returns the length of the MAC or |
255 | * 0 on error. | |
92760c21 MC |
256 | */ |
257 | size_t tls13_final_finish_mac(SSL *s, const char *str, size_t slen, | |
258 | unsigned char *out) | |
259 | { | |
ed576acd | 260 | const char *mdname = EVP_MD_get0_name(ssl_handshake_md(s)); |
6484776f | 261 | unsigned char hash[EVP_MAX_MD_SIZE]; |
c8f6c28a | 262 | unsigned char finsecret[EVP_MAX_MD_SIZE]; |
0edb8194 | 263 | unsigned char *key = NULL; |
21dfdbef | 264 | size_t len = 0, hashlen; |
0a8a6afd | 265 | OSSL_PARAM params[2], *p = params; |
c8f6c28a MC |
266 | |
267 | /* Safe to cast away const here since we're not "getting" any data */ | |
c8f6c28a MC |
268 | if (s->ctx->propq != NULL) |
269 | *p++ = OSSL_PARAM_construct_utf8_string(OSSL_ALG_PARAM_PROPERTIES, | |
270 | (char *)s->ctx->propq, | |
271 | 0); | |
0edb8194 | 272 | *p = OSSL_PARAM_construct_end(); |
92760c21 | 273 | |
d4d2f3a4 MC |
274 | if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) { |
275 | /* SSLfatal() already called */ | |
6484776f | 276 | goto err; |
d4d2f3a4 | 277 | } |
6484776f | 278 | |
de9f5b35 | 279 | if (str == s->method->ssl3_enc->server_finished_label) { |
0edb8194 | 280 | key = s->server_finished_secret; |
de9f5b35 | 281 | } else if (SSL_IS_FIRST_HANDSHAKE(s)) { |
0edb8194 | 282 | key = s->client_finished_secret; |
de9f5b35 | 283 | } else { |
de9f5b35 MC |
284 | if (!tls13_derive_finishedkey(s, ssl_handshake_md(s), |
285 | s->client_app_traffic_secret, | |
286 | finsecret, hashlen)) | |
287 | goto err; | |
0edb8194 | 288 | key = finsecret; |
de9f5b35 | 289 | } |
6484776f | 290 | |
0a8a6afd DDO |
291 | if (!EVP_Q_mac(s->ctx->libctx, "HMAC", s->ctx->propq, mdname, |
292 | params, key, hashlen, hash, hashlen, | |
293 | /* outsize as per sizeof(peer_finish_md) */ | |
294 | out, EVP_MAX_MD_SIZE * 2, &len)) { | |
c48ffbcc | 295 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
6484776f | 296 | goto err; |
d4d2f3a4 | 297 | } |
92760c21 | 298 | |
6484776f | 299 | err: |
c8f6c28a | 300 | OPENSSL_cleanse(finsecret, sizeof(finsecret)); |
21dfdbef | 301 | return len; |
92760c21 MC |
302 | } |
303 | ||
304 | /* | |
305 | * There isn't really a key block in TLSv1.3, but we still need this function | |
f5ca0b04 | 306 | * for initialising the cipher and hash. Returns 1 on success or 0 on failure. |
92760c21 MC |
307 | */ |
308 | int tls13_setup_key_block(SSL *s) | |
309 | { | |
310 | const EVP_CIPHER *c; | |
311 | const EVP_MD *hash; | |
92760c21 | 312 | |
555cbb32 | 313 | s->session->cipher = s->s3.tmp.new_cipher; |
c8f6c28a MC |
314 | if (!ssl_cipher_get_evp(s->ctx, s->session, &c, &hash, NULL, NULL, NULL, |
315 | 0)) { | |
5a2d0ef3 RL |
316 | /* Error is already recorded */ |
317 | SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR); | |
92760c21 MC |
318 | return 0; |
319 | } | |
320 | ||
c8f6c28a | 321 | ssl_evp_cipher_free(s->s3.tmp.new_sym_enc); |
555cbb32 | 322 | s->s3.tmp.new_sym_enc = c; |
c8f6c28a | 323 | ssl_evp_md_free(s->s3.tmp.new_hash); |
555cbb32 | 324 | s->s3.tmp.new_hash = hash; |
92760c21 MC |
325 | |
326 | return 1; | |
327 | } | |
328 | ||
d1186c30 | 329 | static int derive_secret_key_and_iv(SSL *s, int sending, const EVP_MD *md, |
d49e23ec | 330 | const EVP_CIPHER *ciph, |
57389a32 MC |
331 | const unsigned char *insecret, |
332 | const unsigned char *hash, | |
333 | const unsigned char *label, | |
334 | size_t labellen, unsigned char *secret, | |
cc10b56d VF |
335 | unsigned char *key, unsigned char *iv, |
336 | EVP_CIPHER_CTX *ciph_ctx) | |
57389a32 | 337 | { |
57389a32 | 338 | size_t ivlen, keylen, taglen; |
ed576acd | 339 | int hashleni = EVP_MD_get_size(md); |
bceae201 MC |
340 | size_t hashlen; |
341 | ||
342 | /* Ensure cast to size_t is safe */ | |
343 | if (!ossl_assert(hashleni >= 0)) { | |
c48ffbcc | 344 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB); |
cc10b56d | 345 | return 0; |
bceae201 MC |
346 | } |
347 | hashlen = (size_t)hashleni; | |
57389a32 | 348 | |
a19ae67d | 349 | if (!tls13_hkdf_expand(s, md, insecret, label, labellen, hash, hashlen, |
0fb2815b | 350 | secret, hashlen, 1)) { |
f63a17d6 | 351 | /* SSLfatal() already called */ |
cc10b56d | 352 | return 0; |
57389a32 MC |
353 | } |
354 | ||
ed576acd TM |
355 | keylen = EVP_CIPHER_get_key_length(ciph); |
356 | if (EVP_CIPHER_get_mode(ciph) == EVP_CIPH_CCM_MODE) { | |
c117af67 MC |
357 | uint32_t algenc; |
358 | ||
57389a32 | 359 | ivlen = EVP_CCM_TLS_IV_LEN; |
2e1a4f6a | 360 | if (s->s3.tmp.new_cipher != NULL) { |
361 | algenc = s->s3.tmp.new_cipher->algorithm_enc; | |
362 | } else if (s->session->cipher != NULL) { | |
c117af67 MC |
363 | /* We've not selected a cipher yet - we must be doing early data */ |
364 | algenc = s->session->cipher->algorithm_enc; | |
2e1a4f6a | 365 | } else if (s->psksession != NULL && s->psksession->cipher != NULL) { |
366 | /* We must be doing early data with out-of-band PSK */ | |
367 | algenc = s->psksession->cipher->algorithm_enc; | |
c117af67 | 368 | } else { |
c48ffbcc | 369 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB); |
cc10b56d | 370 | return 0; |
c117af67 MC |
371 | } |
372 | if (algenc & (SSL_AES128CCM8 | SSL_AES256CCM8)) | |
57389a32 MC |
373 | taglen = EVP_CCM8_TLS_TAG_LEN; |
374 | else | |
375 | taglen = EVP_CCM_TLS_TAG_LEN; | |
376 | } else { | |
ed576acd | 377 | ivlen = EVP_CIPHER_get_iv_length(ciph); |
57389a32 MC |
378 | taglen = 0; |
379 | } | |
380 | ||
d49e23ec MC |
381 | if (!tls13_derive_key(s, md, secret, key, keylen) |
382 | || !tls13_derive_iv(s, md, secret, iv, ivlen)) { | |
f63a17d6 | 383 | /* SSLfatal() already called */ |
cc10b56d | 384 | return 0; |
57389a32 MC |
385 | } |
386 | ||
d1186c30 | 387 | if (EVP_CipherInit_ex(ciph_ctx, ciph, NULL, NULL, NULL, sending) <= 0 |
57389a32 MC |
388 | || !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_IVLEN, ivlen, NULL) |
389 | || (taglen != 0 && !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_TAG, | |
390 | taglen, NULL)) | |
391 | || EVP_CipherInit_ex(ciph_ctx, NULL, NULL, key, NULL, -1) <= 0) { | |
c48ffbcc | 392 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB); |
cc10b56d | 393 | return 0; |
57389a32 MC |
394 | } |
395 | ||
57389a32 | 396 | return 1; |
57389a32 MC |
397 | } |
398 | ||
0d9824c1 MC |
399 | int tls13_change_cipher_state(SSL *s, int which) |
400 | { | |
48102247 | 401 | #ifdef CHARSET_EBCDIC |
402 | static const unsigned char client_early_traffic[] = {0x63, 0x20, 0x65, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00}; | |
403 | static const unsigned char client_handshake_traffic[] = {0x63, 0x20, 0x68, 0x73, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00}; | |
404 | static const unsigned char client_application_traffic[] = {0x63, 0x20, 0x61, 0x70, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00}; | |
405 | static const unsigned char server_handshake_traffic[] = {0x73, 0x20, 0x68, 0x73, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00}; | |
406 | static const unsigned char server_application_traffic[] = {0x73, 0x20, 0x61, 0x70, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00}; | |
407 | static const unsigned char exporter_master_secret[] = {0x65, 0x78, 0x70, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00}; | |
408 | static const unsigned char resumption_master_secret[] = {0x72, 0x65, 0x73, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00}; | |
409 | static const unsigned char early_exporter_master_secret[] = {0x65, 0x20, 0x65, 0x78, 0x70, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00}; | |
410 | #else | |
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"; |
48102247 | 419 | #endif |
bebc0c7d | 420 | unsigned char *iv; |
cc10b56d | 421 | unsigned char key[EVP_MAX_KEY_LENGTH]; |
0d9824c1 | 422 | unsigned char secret[EVP_MAX_MD_SIZE]; |
ace081c1 MC |
423 | unsigned char hashval[EVP_MAX_MD_SIZE]; |
424 | unsigned char *hash = hashval; | |
0d9824c1 | 425 | unsigned char *insecret; |
6484776f | 426 | unsigned char *finsecret = NULL; |
2c7bd692 | 427 | const char *log_label = NULL; |
0d9824c1 | 428 | EVP_CIPHER_CTX *ciph_ctx; |
57389a32 | 429 | size_t finsecretlen = 0; |
0d9824c1 | 430 | const unsigned char *label; |
ace081c1 | 431 | size_t labellen, hashlen = 0; |
6530c490 | 432 | int ret = 0; |
42f50fdf MC |
433 | const EVP_MD *md = NULL; |
434 | const EVP_CIPHER *cipher = NULL; | |
cc10b56d | 435 | #if !defined(OPENSSL_NO_KTLS) && defined(OPENSSL_KTLS_TLS13) |
c34ca13a | 436 | ktls_crypto_info_t crypto_info; |
7c78932b | 437 | void *rl_sequence; |
cc10b56d | 438 | BIO *bio; |
cc10b56d | 439 | #endif |
0d9824c1 MC |
440 | |
441 | if (which & SSL3_CC_READ) { | |
442 | if (s->enc_read_ctx != NULL) { | |
443 | EVP_CIPHER_CTX_reset(s->enc_read_ctx); | |
444 | } else { | |
445 | s->enc_read_ctx = EVP_CIPHER_CTX_new(); | |
446 | if (s->enc_read_ctx == NULL) { | |
c48ffbcc | 447 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE); |
0d9824c1 MC |
448 | goto err; |
449 | } | |
450 | } | |
451 | ciph_ctx = s->enc_read_ctx; | |
bebc0c7d | 452 | iv = s->read_iv; |
0d9824c1 MC |
453 | |
454 | RECORD_LAYER_reset_read_sequence(&s->rlayer); | |
455 | } else { | |
7426cd34 | 456 | s->statem.enc_write_state = ENC_WRITE_STATE_INVALID; |
0d9824c1 MC |
457 | if (s->enc_write_ctx != NULL) { |
458 | EVP_CIPHER_CTX_reset(s->enc_write_ctx); | |
459 | } else { | |
460 | s->enc_write_ctx = EVP_CIPHER_CTX_new(); | |
461 | if (s->enc_write_ctx == NULL) { | |
c48ffbcc | 462 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE); |
0d9824c1 MC |
463 | goto err; |
464 | } | |
465 | } | |
466 | ciph_ctx = s->enc_write_ctx; | |
bebc0c7d | 467 | iv = s->write_iv; |
0d9824c1 MC |
468 | |
469 | RECORD_LAYER_reset_write_sequence(&s->rlayer); | |
470 | } | |
471 | ||
472 | if (((which & SSL3_CC_CLIENT) && (which & SSL3_CC_WRITE)) | |
473 | || ((which & SSL3_CC_SERVER) && (which & SSL3_CC_READ))) { | |
d49e23ec MC |
474 | if (which & SSL3_CC_EARLY) { |
475 | EVP_MD_CTX *mdctx = NULL; | |
476 | long handlen; | |
477 | void *hdata; | |
478 | unsigned int hashlenui; | |
479 | const SSL_CIPHER *sslcipher = SSL_SESSION_get0_cipher(s->session); | |
480 | ||
481 | insecret = s->early_secret; | |
482 | label = client_early_traffic; | |
483 | labellen = sizeof(client_early_traffic) - 1; | |
484 | log_label = CLIENT_EARLY_LABEL; | |
485 | ||
555cbb32 | 486 | handlen = BIO_get_mem_data(s->s3.handshake_buffer, &hdata); |
d49e23ec | 487 | if (handlen <= 0) { |
c48ffbcc | 488 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_LENGTH); |
d49e23ec MC |
489 | goto err; |
490 | } | |
add8d0e9 | 491 | |
08717544 MC |
492 | if (s->early_data_state == SSL_EARLY_DATA_CONNECTING |
493 | && s->max_early_data > 0 | |
494 | && s->session->ext.max_early_data == 0) { | |
495 | /* | |
496 | * If we are attempting to send early data, and we've decided to | |
497 | * actually do it but max_early_data in s->session is 0 then we | |
498 | * must be using an external PSK. | |
499 | */ | |
500 | if (!ossl_assert(s->psksession != NULL | |
501 | && s->max_early_data == | |
502 | s->psksession->ext.max_early_data)) { | |
c48ffbcc | 503 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
08717544 MC |
504 | goto err; |
505 | } | |
add8d0e9 | 506 | sslcipher = SSL_SESSION_get0_cipher(s->psksession); |
08717544 | 507 | } |
d49e23ec | 508 | if (sslcipher == NULL) { |
c48ffbcc | 509 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, 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) { | |
c48ffbcc | 520 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE); |
d49e23ec MC |
521 | goto err; |
522 | } | |
9727f4e7 MC |
523 | |
524 | /* | |
525 | * This ups the ref count on cipher so we better make sure we free | |
526 | * it again | |
527 | */ | |
528 | if (!ssl_cipher_get_evp_cipher(s->ctx, sslcipher, &cipher)) { | |
5a2d0ef3 RL |
529 | /* Error is already recorded */ |
530 | SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR); | |
67d744b9 | 531 | EVP_MD_CTX_free(mdctx); |
9727f4e7 MC |
532 | goto err; |
533 | } | |
534 | ||
c8f6c28a | 535 | md = ssl_md(s->ctx, sslcipher->algorithm2); |
d49e23ec MC |
536 | if (md == NULL || !EVP_DigestInit_ex(mdctx, md, NULL) |
537 | || !EVP_DigestUpdate(mdctx, hdata, handlen) | |
538 | || !EVP_DigestFinal_ex(mdctx, hashval, &hashlenui)) { | |
c48ffbcc | 539 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
d49e23ec MC |
540 | EVP_MD_CTX_free(mdctx); |
541 | goto err; | |
542 | } | |
543 | hashlen = hashlenui; | |
544 | EVP_MD_CTX_free(mdctx); | |
b38ede80 TT |
545 | |
546 | if (!tls13_hkdf_expand(s, md, insecret, | |
547 | early_exporter_master_secret, | |
548 | sizeof(early_exporter_master_secret) - 1, | |
549 | hashval, hashlen, | |
0fb2815b MC |
550 | s->early_exporter_master_secret, hashlen, |
551 | 1)) { | |
c48ffbcc | 552 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
b38ede80 TT |
553 | goto err; |
554 | } | |
01a2a654 PW |
555 | |
556 | if (!ssl_log_secret(s, EARLY_EXPORTER_SECRET_LABEL, | |
557 | s->early_exporter_master_secret, hashlen)) { | |
558 | /* SSLfatal() already called */ | |
559 | goto err; | |
560 | } | |
d49e23ec | 561 | } else if (which & SSL3_CC_HANDSHAKE) { |
0d9824c1 | 562 | insecret = s->handshake_secret; |
6484776f | 563 | finsecret = s->client_finished_secret; |
ed576acd | 564 | finsecretlen = EVP_MD_get_size(ssl_handshake_md(s)); |
0d9824c1 MC |
565 | label = client_handshake_traffic; |
566 | labellen = sizeof(client_handshake_traffic) - 1; | |
2c7bd692 | 567 | log_label = CLIENT_HANDSHAKE_LABEL; |
fe5e20fd | 568 | /* |
69687aa8 | 569 | * The handshake hash used for the server read/client write handshake |
f7e393be MC |
570 | * traffic secret is the same as the hash for the server |
571 | * write/client read handshake traffic secret. However, if we | |
572 | * processed early data then we delay changing the server | |
573 | * read/client write cipher state until later, and the handshake | |
574 | * hashes have moved on. Therefore we use the value saved earlier | |
575 | * when we did the server write/client read change cipher state. | |
fe5e20fd | 576 | */ |
f7e393be | 577 | hash = s->handshake_traffic_hash; |
0d9824c1 | 578 | } else { |
ec15acb6 | 579 | insecret = s->master_secret; |
0d9824c1 MC |
580 | label = client_application_traffic; |
581 | labellen = sizeof(client_application_traffic) - 1; | |
2c7bd692 | 582 | log_label = CLIENT_APPLICATION_LABEL; |
ace081c1 MC |
583 | /* |
584 | * For this we only use the handshake hashes up until the server | |
585 | * Finished hash. We do not include the client's Finished, which is | |
586 | * what ssl_handshake_hash() would give us. Instead we use the | |
587 | * previously saved value. | |
588 | */ | |
589 | hash = s->server_finished_hash; | |
0d9824c1 MC |
590 | } |
591 | } else { | |
d49e23ec | 592 | /* Early data never applies to client-read/server-write */ |
0d9824c1 MC |
593 | if (which & SSL3_CC_HANDSHAKE) { |
594 | insecret = s->handshake_secret; | |
6484776f | 595 | finsecret = s->server_finished_secret; |
ed576acd | 596 | finsecretlen = EVP_MD_get_size(ssl_handshake_md(s)); |
0d9824c1 MC |
597 | label = server_handshake_traffic; |
598 | labellen = sizeof(server_handshake_traffic) - 1; | |
2c7bd692 | 599 | log_label = SERVER_HANDSHAKE_LABEL; |
0d9824c1 | 600 | } else { |
ec15acb6 | 601 | insecret = s->master_secret; |
0d9824c1 MC |
602 | label = server_application_traffic; |
603 | labellen = sizeof(server_application_traffic) - 1; | |
2c7bd692 | 604 | log_label = SERVER_APPLICATION_LABEL; |
0d9824c1 MC |
605 | } |
606 | } | |
607 | ||
d49e23ec MC |
608 | if (!(which & SSL3_CC_EARLY)) { |
609 | md = ssl_handshake_md(s); | |
555cbb32 | 610 | cipher = s->s3.tmp.new_sym_enc; |
d49e23ec MC |
611 | if (!ssl3_digest_cached_records(s, 1) |
612 | || !ssl_handshake_hash(s, hashval, sizeof(hashval), &hashlen)) { | |
f63a17d6 | 613 | /* SSLfatal() already called */; |
d49e23ec MC |
614 | goto err; |
615 | } | |
ace081c1 MC |
616 | } |
617 | ||
ec15acb6 MC |
618 | /* |
619 | * Save the hash of handshakes up to now for use when we calculate the | |
620 | * client application traffic secret | |
621 | */ | |
622 | if (label == server_application_traffic) | |
623 | memcpy(s->server_finished_hash, hashval, hashlen); | |
624 | ||
f7e393be | 625 | if (label == server_handshake_traffic) |
fe5e20fd MC |
626 | memcpy(s->handshake_traffic_hash, hashval, hashlen); |
627 | ||
ec15acb6 MC |
628 | if (label == client_application_traffic) { |
629 | /* | |
630 | * We also create the resumption master secret, but this time use the | |
631 | * hash for the whole handshake including the Client Finished | |
632 | */ | |
633 | if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret, | |
634 | resumption_master_secret, | |
635 | sizeof(resumption_master_secret) - 1, | |
4ff1a526 | 636 | hashval, hashlen, s->resumption_master_secret, |
0fb2815b | 637 | hashlen, 1)) { |
f63a17d6 | 638 | /* SSLfatal() already called */ |
ec15acb6 MC |
639 | goto err; |
640 | } | |
ec15acb6 MC |
641 | } |
642 | ||
cc10b56d | 643 | /* check whether cipher is known */ |
1287dabd | 644 | if (!ossl_assert(cipher != NULL)) |
cc10b56d VF |
645 | goto err; |
646 | ||
d49e23ec | 647 | if (!derive_secret_key_and_iv(s, which & SSL3_CC_WRITE, md, cipher, |
cc10b56d VF |
648 | insecret, hash, label, labellen, secret, key, |
649 | iv, ciph_ctx)) { | |
f63a17d6 | 650 | /* SSLfatal() already called */ |
57389a32 | 651 | goto err; |
ec07b1d8 | 652 | } |
0d9824c1 | 653 | |
2221ec10 | 654 | if (label == server_application_traffic) { |
57389a32 | 655 | memcpy(s->server_app_traffic_secret, secret, hashlen); |
2221ec10 TT |
656 | /* Now we create the exporter master secret */ |
657 | if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret, | |
658 | exporter_master_secret, | |
659 | sizeof(exporter_master_secret) - 1, | |
660 | hash, hashlen, s->exporter_master_secret, | |
0fb2815b | 661 | hashlen, 1)) { |
2221ec10 TT |
662 | /* SSLfatal() already called */ |
663 | goto err; | |
664 | } | |
6329ce8f PW |
665 | |
666 | if (!ssl_log_secret(s, EXPORTER_SECRET_LABEL, s->exporter_master_secret, | |
667 | hashlen)) { | |
668 | /* SSLfatal() already called */ | |
669 | goto err; | |
670 | } | |
2221ec10 | 671 | } else if (label == client_application_traffic) |
57389a32 MC |
672 | memcpy(s->client_app_traffic_secret, secret, hashlen); |
673 | ||
2c7bd692 | 674 | if (!ssl_log_secret(s, log_label, secret, hashlen)) { |
f63a17d6 | 675 | /* SSLfatal() already called */ |
2c7bd692 CB |
676 | goto err; |
677 | } | |
678 | ||
57389a32 MC |
679 | if (finsecret != NULL |
680 | && !tls13_derive_finishedkey(s, ssl_handshake_md(s), secret, | |
681 | finsecret, finsecretlen)) { | |
f63a17d6 | 682 | /* SSLfatal() already called */ |
0d9824c1 MC |
683 | goto err; |
684 | } | |
685 | ||
7426cd34 MC |
686 | if (!s->server && label == client_early_traffic) |
687 | s->statem.enc_write_state = ENC_WRITE_STATE_WRITE_PLAIN_ALERTS; | |
688 | else | |
689 | s->statem.enc_write_state = ENC_WRITE_STATE_VALID; | |
cc10b56d VF |
690 | #ifndef OPENSSL_NO_KTLS |
691 | # if defined(OPENSSL_KTLS_TLS13) | |
7c78932b | 692 | if (!(which & SSL3_CC_APPLICATION) |
a3a54179 | 693 | || (s->options & SSL_OP_ENABLE_KTLS) == 0) |
cc10b56d VF |
694 | goto skip_ktls; |
695 | ||
696 | /* ktls supports only the maximum fragment size */ | |
697 | if (ssl_get_max_send_fragment(s) != SSL3_RT_MAX_PLAIN_LENGTH) | |
698 | goto skip_ktls; | |
699 | ||
700 | /* ktls does not support record padding */ | |
701 | if (s->record_padding_cb != NULL) | |
702 | goto skip_ktls; | |
703 | ||
704 | /* check that cipher is supported */ | |
3e582606 | 705 | if (!ktls_check_supported_cipher(s, cipher, ciph_ctx)) |
cc10b56d VF |
706 | goto skip_ktls; |
707 | ||
7c78932b DU |
708 | if (which & SSL3_CC_WRITE) |
709 | bio = s->wbio; | |
710 | else | |
711 | bio = s->rbio; | |
cc10b56d VF |
712 | |
713 | if (!ossl_assert(bio != NULL)) { | |
c48ffbcc | 714 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
cc10b56d VF |
715 | goto err; |
716 | } | |
717 | ||
718 | /* All future data will get encrypted by ktls. Flush the BIO or skip ktls */ | |
7c78932b DU |
719 | if (which & SSL3_CC_WRITE) { |
720 | if (BIO_flush(bio) <= 0) | |
721 | goto skip_ktls; | |
722 | } | |
cc10b56d VF |
723 | |
724 | /* configure kernel crypto structure */ | |
7c78932b DU |
725 | if (which & SSL3_CC_WRITE) |
726 | rl_sequence = RECORD_LAYER_get_write_sequence(&s->rlayer); | |
727 | else | |
728 | rl_sequence = RECORD_LAYER_get_read_sequence(&s->rlayer); | |
729 | ||
730 | if (!ktls_configure_crypto(s, cipher, ciph_ctx, rl_sequence, &crypto_info, | |
731 | which & SSL3_CC_WRITE, iv, key, NULL, 0)) | |
cc10b56d VF |
732 | goto skip_ktls; |
733 | ||
734 | /* ktls works with user provided buffers directly */ | |
7c78932b DU |
735 | if (BIO_set_ktls(bio, &crypto_info, which & SSL3_CC_WRITE)) { |
736 | if (which & SSL3_CC_WRITE) | |
737 | ssl3_release_write_buffer(s); | |
738 | } | |
cc10b56d VF |
739 | skip_ktls: |
740 | # endif | |
741 | #endif | |
57389a32 MC |
742 | ret = 1; |
743 | err: | |
9727f4e7 MC |
744 | if ((which & SSL3_CC_EARLY) != 0) { |
745 | /* We up-refed this so now we need to down ref */ | |
746 | ssl_evp_cipher_free(cipher); | |
747 | } | |
cc10b56d | 748 | OPENSSL_cleanse(key, sizeof(key)); |
57389a32 MC |
749 | OPENSSL_cleanse(secret, sizeof(secret)); |
750 | return ret; | |
751 | } | |
0d9824c1 | 752 | |
d1186c30 | 753 | int tls13_update_key(SSL *s, int sending) |
57389a32 | 754 | { |
48102247 | 755 | #ifdef CHARSET_EBCDIC |
756 | static const unsigned char application_traffic[] = { 0x74, 0x72 ,0x61 ,0x66 ,0x66 ,0x69 ,0x63 ,0x20 ,0x75 ,0x70 ,0x64, 0x00}; | |
757 | #else | |
758 | static const unsigned char application_traffic[] = "traffic upd"; | |
759 | #endif | |
57389a32 | 760 | const EVP_MD *md = ssl_handshake_md(s); |
ed576acd | 761 | size_t hashlen = EVP_MD_get_size(md); |
cc10b56d | 762 | unsigned char key[EVP_MAX_KEY_LENGTH]; |
57389a32 MC |
763 | unsigned char *insecret, *iv; |
764 | unsigned char secret[EVP_MAX_MD_SIZE]; | |
765 | EVP_CIPHER_CTX *ciph_ctx; | |
766 | int ret = 0; | |
0d9824c1 | 767 | |
d1186c30 | 768 | if (s->server == sending) |
57389a32 MC |
769 | insecret = s->server_app_traffic_secret; |
770 | else | |
771 | insecret = s->client_app_traffic_secret; | |
bebc0c7d | 772 | |
d1186c30 | 773 | if (sending) { |
7426cd34 | 774 | s->statem.enc_write_state = ENC_WRITE_STATE_INVALID; |
57389a32 MC |
775 | iv = s->write_iv; |
776 | ciph_ctx = s->enc_write_ctx; | |
777 | RECORD_LAYER_reset_write_sequence(&s->rlayer); | |
778 | } else { | |
779 | iv = s->read_iv; | |
780 | ciph_ctx = s->enc_read_ctx; | |
781 | RECORD_LAYER_reset_read_sequence(&s->rlayer); | |
0d9824c1 | 782 | } |
57389a32 | 783 | |
d1186c30 | 784 | if (!derive_secret_key_and_iv(s, sending, ssl_handshake_md(s), |
555cbb32 | 785 | s->s3.tmp.new_sym_enc, insecret, NULL, |
d49e23ec | 786 | application_traffic, |
cc10b56d VF |
787 | sizeof(application_traffic) - 1, secret, key, |
788 | iv, ciph_ctx)) { | |
f63a17d6 | 789 | /* SSLfatal() already called */ |
57389a32 | 790 | goto err; |
f63a17d6 | 791 | } |
57389a32 MC |
792 | |
793 | memcpy(insecret, secret, hashlen); | |
0d9824c1 | 794 | |
7426cd34 | 795 | s->statem.enc_write_state = ENC_WRITE_STATE_VALID; |
6530c490 | 796 | ret = 1; |
0d9824c1 | 797 | err: |
cc10b56d | 798 | OPENSSL_cleanse(key, sizeof(key)); |
0d9824c1 | 799 | OPENSSL_cleanse(secret, sizeof(secret)); |
6530c490 | 800 | return ret; |
0d9824c1 | 801 | } |
04904312 MC |
802 | |
803 | int tls13_alert_code(int code) | |
804 | { | |
43a0f273 MC |
805 | /* There are 2 additional alerts in TLSv1.3 compared to TLSv1.2 */ |
806 | if (code == SSL_AD_MISSING_EXTENSION || code == SSL_AD_CERTIFICATE_REQUIRED) | |
04904312 MC |
807 | return code; |
808 | ||
809 | return tls1_alert_code(code); | |
810 | } | |
0ca8d1ec MC |
811 | |
812 | int tls13_export_keying_material(SSL *s, unsigned char *out, size_t olen, | |
813 | const char *label, size_t llen, | |
814 | const unsigned char *context, | |
815 | size_t contextlen, int use_context) | |
816 | { | |
817 | unsigned char exportsecret[EVP_MAX_MD_SIZE]; | |
48102247 | 818 | #ifdef CHARSET_EBCDIC |
819 | static const unsigned char exporterlabel[] = {0x65, 0x78, 0x70, 0x6F, 0x72, 0x74, 0x65, 0x72, 0x00}; | |
820 | #else | |
0ca8d1ec | 821 | static const unsigned char exporterlabel[] = "exporter"; |
48102247 | 822 | #endif |
c8b93876 | 823 | unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE]; |
0ca8d1ec MC |
824 | const EVP_MD *md = ssl_handshake_md(s); |
825 | EVP_MD_CTX *ctx = EVP_MD_CTX_new(); | |
c8b93876 | 826 | unsigned int hashsize, datalen; |
0ca8d1ec MC |
827 | int ret = 0; |
828 | ||
1f5878b8 | 829 | if (ctx == NULL || !ossl_statem_export_allowed(s)) |
0ca8d1ec MC |
830 | goto err; |
831 | ||
832 | if (!use_context) | |
833 | contextlen = 0; | |
834 | ||
835 | if (EVP_DigestInit_ex(ctx, md, NULL) <= 0 | |
836 | || EVP_DigestUpdate(ctx, context, contextlen) <= 0 | |
837 | || EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0 | |
c8b93876 TT |
838 | || EVP_DigestInit_ex(ctx, md, NULL) <= 0 |
839 | || EVP_DigestFinal_ex(ctx, data, &datalen) <= 0 | |
0ca8d1ec | 840 | || !tls13_hkdf_expand(s, md, s->exporter_master_secret, |
c8b93876 | 841 | (const unsigned char *)label, llen, |
0fb2815b | 842 | data, datalen, exportsecret, hashsize, 0) |
0ca8d1ec | 843 | || !tls13_hkdf_expand(s, md, exportsecret, exporterlabel, |
a19ae67d | 844 | sizeof(exporterlabel) - 1, hash, hashsize, |
0fb2815b | 845 | out, olen, 0)) |
0ca8d1ec MC |
846 | goto err; |
847 | ||
848 | ret = 1; | |
849 | err: | |
850 | EVP_MD_CTX_free(ctx); | |
851 | return ret; | |
852 | } | |
b38ede80 TT |
853 | |
854 | int tls13_export_keying_material_early(SSL *s, unsigned char *out, size_t olen, | |
855 | const char *label, size_t llen, | |
856 | const unsigned char *context, | |
857 | size_t contextlen) | |
858 | { | |
48102247 | 859 | #ifdef CHARSET_EBCDIC |
860 | static const unsigned char exporterlabel[] = {0x65, 0x78, 0x70, 0x6F, 0x72, 0x74, 0x65, 0x72, 0x00}; | |
861 | #else | |
862 | static const unsigned char exporterlabel[] = "exporter"; | |
863 | #endif | |
b38ede80 TT |
864 | unsigned char exportsecret[EVP_MAX_MD_SIZE]; |
865 | unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE]; | |
866 | const EVP_MD *md; | |
867 | EVP_MD_CTX *ctx = EVP_MD_CTX_new(); | |
868 | unsigned int hashsize, datalen; | |
869 | int ret = 0; | |
870 | const SSL_CIPHER *sslcipher; | |
871 | ||
872 | if (ctx == NULL || !ossl_statem_export_early_allowed(s)) | |
873 | goto err; | |
874 | ||
875 | if (!s->server && s->max_early_data > 0 | |
876 | && s->session->ext.max_early_data == 0) | |
877 | sslcipher = SSL_SESSION_get0_cipher(s->psksession); | |
878 | else | |
879 | sslcipher = SSL_SESSION_get0_cipher(s->session); | |
880 | ||
c8f6c28a | 881 | md = ssl_md(s->ctx, sslcipher->algorithm2); |
b38ede80 TT |
882 | |
883 | /* | |
884 | * Calculate the hash value and store it in |data|. The reason why | |
885 | * the empty string is used is that the definition of TLS-Exporter | |
886 | * is like so: | |
887 | * | |
888 | * TLS-Exporter(label, context_value, key_length) = | |
889 | * HKDF-Expand-Label(Derive-Secret(Secret, label, ""), | |
890 | * "exporter", Hash(context_value), key_length) | |
891 | * | |
892 | * Derive-Secret(Secret, Label, Messages) = | |
893 | * HKDF-Expand-Label(Secret, Label, | |
894 | * Transcript-Hash(Messages), Hash.length) | |
895 | * | |
896 | * Here Transcript-Hash is the cipher suite hash algorithm. | |
897 | */ | |
898 | if (EVP_DigestInit_ex(ctx, md, NULL) <= 0 | |
899 | || EVP_DigestUpdate(ctx, context, contextlen) <= 0 | |
900 | || EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0 | |
901 | || EVP_DigestInit_ex(ctx, md, NULL) <= 0 | |
902 | || EVP_DigestFinal_ex(ctx, data, &datalen) <= 0 | |
903 | || !tls13_hkdf_expand(s, md, s->early_exporter_master_secret, | |
904 | (const unsigned char *)label, llen, | |
0fb2815b | 905 | data, datalen, exportsecret, hashsize, 0) |
b38ede80 TT |
906 | || !tls13_hkdf_expand(s, md, exportsecret, exporterlabel, |
907 | sizeof(exporterlabel) - 1, hash, hashsize, | |
0fb2815b | 908 | out, olen, 0)) |
b38ede80 TT |
909 | goto err; |
910 | ||
911 | ret = 1; | |
912 | err: | |
913 | EVP_MD_CTX_free(ctx); | |
914 | return ret; | |
915 | } |