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34574f19 | 1 | /* |
33388b44 | 2 | * Copyright 2016-2020 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 MC |
20 | |
21 | /* Always filled with zeros */ | |
22 | static const unsigned char default_zeros[EVP_MAX_MD_SIZE]; | |
23 | ||
34574f19 | 24 | /* |
a19ae67d MC |
25 | * Given a |secret|; a |label| of length |labellen|; and |data| of length |
26 | * |datalen| (e.g. typically a hash of the handshake messages), derive a new | |
27 | * secret |outlen| bytes long and store it in the location pointed to be |out|. | |
0fb2815b MC |
28 | * The |data| value may be zero length. Any errors will be treated as fatal if |
29 | * |fatal| is set. Returns 1 on success 0 on failure. | |
34574f19 | 30 | */ |
ec15acb6 | 31 | int tls13_hkdf_expand(SSL *s, const EVP_MD *md, const unsigned char *secret, |
34574f19 | 32 | const unsigned char *label, size_t labellen, |
a19ae67d | 33 | const unsigned char *data, size_t datalen, |
0fb2815b | 34 | unsigned char *out, size_t outlen, int fatal) |
34574f19 | 35 | { |
48102247 | 36 | #ifdef CHARSET_EBCDIC |
37 | static const unsigned char label_prefix[] = { 0x74, 0x6C, 0x73, 0x31, 0x33, 0x20, 0x00 }; | |
38 | #else | |
0fb2815b | 39 | static const unsigned char label_prefix[] = "tls13 "; |
48102247 | 40 | #endif |
c8f6c28a MC |
41 | EVP_KDF *kdf = EVP_KDF_fetch(s->ctx->libctx, OSSL_KDF_NAME_HKDF, |
42 | s->ctx->propq); | |
ce3b1bb4 P |
43 | EVP_KDF_CTX *kctx; |
44 | OSSL_PARAM params[5], *p = params; | |
45 | int mode = EVP_PKEY_HKDEF_MODE_EXPAND_ONLY; | |
46 | const char *mdname = EVP_MD_name(md); | |
34574f19 MC |
47 | int ret; |
48 | size_t hkdflabellen; | |
49 | size_t hashlen; | |
50 | /* | |
0fb2815b MC |
51 | * 2 bytes for length of derived secret + 1 byte for length of combined |
52 | * prefix and label + bytes for the label itself + 1 byte length of hash | |
53 | * + bytes for the hash itself | |
34574f19 | 54 | */ |
2de5a5fb | 55 | unsigned char hkdflabel[sizeof(uint16_t) + sizeof(uint8_t) |
0b4233f5 | 56 | + (sizeof(label_prefix) - 1) + TLS13_MAX_LABEL_LEN |
0fb2815b | 57 | + 1 + EVP_MAX_MD_SIZE]; |
34574f19 MC |
58 | WPACKET pkt; |
59 | ||
660c5344 | 60 | kctx = EVP_KDF_CTX_new(kdf); |
ce3b1bb4 | 61 | EVP_KDF_free(kdf); |
32495464 | 62 | if (kctx == NULL) |
34574f19 MC |
63 | return 0; |
64 | ||
0fb2815b MC |
65 | if (labellen > TLS13_MAX_LABEL_LEN) { |
66 | if (fatal) { | |
c48ffbcc | 67 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
0fb2815b MC |
68 | } else { |
69 | /* | |
70 | * Probably we have been called from SSL_export_keying_material(), | |
71 | * or SSL_export_keying_material_early(). | |
72 | */ | |
6849b73c | 73 | ERR_raise(ERR_LIB_SSL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL); |
0fb2815b | 74 | } |
660c5344 | 75 | EVP_KDF_CTX_free(kctx); |
0fb2815b MC |
76 | return 0; |
77 | } | |
78 | ||
34574f19 MC |
79 | hashlen = EVP_MD_size(md); |
80 | ||
81 | if (!WPACKET_init_static_len(&pkt, hkdflabel, sizeof(hkdflabel), 0) | |
82 | || !WPACKET_put_bytes_u16(&pkt, outlen) | |
83 | || !WPACKET_start_sub_packet_u8(&pkt) | |
84 | || !WPACKET_memcpy(&pkt, label_prefix, sizeof(label_prefix) - 1) | |
85 | || !WPACKET_memcpy(&pkt, label, labellen) | |
86 | || !WPACKET_close(&pkt) | |
a19ae67d | 87 | || !WPACKET_sub_memcpy_u8(&pkt, data, (data == NULL) ? 0 : datalen) |
34574f19 MC |
88 | || !WPACKET_get_total_written(&pkt, &hkdflabellen) |
89 | || !WPACKET_finish(&pkt)) { | |
660c5344 | 90 | EVP_KDF_CTX_free(kctx); |
34574f19 | 91 | WPACKET_cleanup(&pkt); |
0fb2815b | 92 | if (fatal) |
c48ffbcc | 93 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
0fb2815b | 94 | else |
6849b73c | 95 | ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR); |
34574f19 MC |
96 | return 0; |
97 | } | |
98 | ||
ce3b1bb4 P |
99 | *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_MODE, &mode); |
100 | *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST, | |
8b6ffd40 | 101 | (char *)mdname, 0); |
ce3b1bb4 P |
102 | *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY, |
103 | (unsigned char *)secret, hashlen); | |
104 | *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_INFO, | |
105 | hkdflabel, hkdflabellen); | |
106 | *p++ = OSSL_PARAM_construct_end(); | |
107 | ||
660c5344 | 108 | ret = EVP_KDF_CTX_set_params(kctx, params) <= 0 |
32495464 | 109 | || EVP_KDF_derive(kctx, out, outlen) <= 0; |
34574f19 | 110 | |
660c5344 | 111 | EVP_KDF_CTX_free(kctx); |
34574f19 | 112 | |
0fb2815b MC |
113 | if (ret != 0) { |
114 | if (fatal) | |
c48ffbcc | 115 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
0fb2815b | 116 | else |
6849b73c | 117 | ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR); |
0fb2815b | 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 |
127 | int 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 |
144 | int 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 |
157 | int 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 |
176 | int 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 | |
c8f6c28a | 197 | kdf = EVP_KDF_fetch(s->ctx->libctx, OSSL_KDF_NAME_HKDF, s->ctx->propq); |
660c5344 | 198 | kctx = EVP_KDF_CTX_new(kdf); |
ce3b1bb4 | 199 | EVP_KDF_free(kdf); |
32495464 | 200 | if (kctx == NULL) { |
c48ffbcc | 201 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
34574f19 | 202 | return 0; |
f63a17d6 | 203 | } |
34574f19 | 204 | |
bceae201 MC |
205 | mdleni = EVP_MD_size(md); |
206 | /* Ensure cast to size_t is safe */ | |
207 | if (!ossl_assert(mdleni >= 0)) { | |
c48ffbcc | 208 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
660c5344 | 209 | EVP_KDF_CTX_free(kctx); |
bceae201 MC |
210 | return 0; |
211 | } | |
212 | mdlen = (size_t)mdleni; | |
34574f19 MC |
213 | |
214 | if (insecret == NULL) { | |
215 | insecret = default_zeros; | |
216 | insecretlen = mdlen; | |
217 | } | |
218 | if (prevsecret == NULL) { | |
219 | prevsecret = default_zeros; | |
220 | prevsecretlen = 0; | |
221 | } else { | |
3e0458fb MC |
222 | EVP_MD_CTX *mctx = EVP_MD_CTX_new(); |
223 | unsigned char hash[EVP_MAX_MD_SIZE]; | |
224 | ||
225 | /* The pre-extract derive step uses a hash of no messages */ | |
226 | if (mctx == NULL | |
227 | || EVP_DigestInit_ex(mctx, md, NULL) <= 0 | |
228 | || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) { | |
c48ffbcc | 229 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
3e0458fb | 230 | EVP_MD_CTX_free(mctx); |
660c5344 | 231 | EVP_KDF_CTX_free(kctx); |
3e0458fb MC |
232 | return 0; |
233 | } | |
234 | EVP_MD_CTX_free(mctx); | |
235 | ||
236 | /* Generate the pre-extract secret */ | |
237 | if (!tls13_hkdf_expand(s, md, prevsecret, | |
238 | (unsigned char *)derived_secret_label, | |
a19ae67d | 239 | sizeof(derived_secret_label) - 1, hash, mdlen, |
0fb2815b | 240 | preextractsec, mdlen, 1)) { |
f63a17d6 | 241 | /* SSLfatal() already called */ |
660c5344 | 242 | EVP_KDF_CTX_free(kctx); |
3e0458fb | 243 | return 0; |
71d8c138 | 244 | } |
3e0458fb MC |
245 | |
246 | prevsecret = preextractsec; | |
34574f19 MC |
247 | prevsecretlen = mdlen; |
248 | } | |
249 | ||
ce3b1bb4 P |
250 | *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_MODE, &mode); |
251 | *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST, | |
8b6ffd40 | 252 | (char *)mdname, 0); |
ce3b1bb4 P |
253 | *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY, |
254 | (unsigned char *)insecret, | |
255 | insecretlen); | |
256 | *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT, | |
257 | (unsigned char *)prevsecret, | |
258 | prevsecretlen); | |
259 | *p++ = OSSL_PARAM_construct_end(); | |
260 | ||
660c5344 | 261 | ret = EVP_KDF_CTX_set_params(kctx, params) <= 0 |
32495464 | 262 | || EVP_KDF_derive(kctx, outsecret, mdlen) <= 0; |
34574f19 | 263 | |
f63a17d6 | 264 | if (ret != 0) |
c48ffbcc | 265 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
f63a17d6 | 266 | |
660c5344 | 267 | EVP_KDF_CTX_free(kctx); |
3e0458fb MC |
268 | if (prevsecret == preextractsec) |
269 | OPENSSL_cleanse(preextractsec, mdlen); | |
34574f19 MC |
270 | return ret == 0; |
271 | } | |
272 | ||
34574f19 MC |
273 | /* |
274 | * Given an input secret |insecret| of length |insecretlen| generate the | |
275 | * handshake secret. This requires the early secret to already have been | |
f5ca0b04 | 276 | * generated. Returns 1 on success 0 on failure. |
34574f19 MC |
277 | */ |
278 | int tls13_generate_handshake_secret(SSL *s, const unsigned char *insecret, | |
279 | size_t insecretlen) | |
280 | { | |
f63a17d6 | 281 | /* Calls SSLfatal() if required */ |
ec15acb6 MC |
282 | return tls13_generate_secret(s, ssl_handshake_md(s), s->early_secret, |
283 | insecret, insecretlen, | |
34574f19 MC |
284 | (unsigned char *)&s->handshake_secret); |
285 | } | |
286 | ||
287 | /* | |
288 | * Given the handshake secret |prev| of length |prevlen| generate the master | |
f5ca0b04 MC |
289 | * secret and store its length in |*secret_size|. Returns 1 on success 0 on |
290 | * failure. | |
34574f19 MC |
291 | */ |
292 | int tls13_generate_master_secret(SSL *s, unsigned char *out, | |
293 | unsigned char *prev, size_t prevlen, | |
294 | size_t *secret_size) | |
295 | { | |
ec15acb6 MC |
296 | const EVP_MD *md = ssl_handshake_md(s); |
297 | ||
298 | *secret_size = EVP_MD_size(md); | |
f63a17d6 | 299 | /* Calls SSLfatal() if required */ |
ec15acb6 | 300 | return tls13_generate_secret(s, md, prev, NULL, 0, out); |
34574f19 MC |
301 | } |
302 | ||
92760c21 | 303 | /* |
f5ca0b04 MC |
304 | * Generates the mac for the Finished message. Returns the length of the MAC or |
305 | * 0 on error. | |
92760c21 MC |
306 | */ |
307 | size_t tls13_final_finish_mac(SSL *s, const char *str, size_t slen, | |
308 | unsigned char *out) | |
309 | { | |
c8f6c28a MC |
310 | const char *mdname = EVP_MD_name(ssl_handshake_md(s)); |
311 | EVP_MAC *hmac = EVP_MAC_fetch(s->ctx->libctx, "HMAC", s->ctx->propq); | |
6484776f | 312 | unsigned char hash[EVP_MAX_MD_SIZE]; |
c8f6c28a | 313 | unsigned char finsecret[EVP_MAX_MD_SIZE]; |
6484776f | 314 | size_t hashlen, ret = 0; |
c8f6c28a MC |
315 | EVP_MAC_CTX *ctx = NULL; |
316 | OSSL_PARAM params[4], *p = params; | |
317 | ||
318 | if (hmac == NULL) { | |
c48ffbcc | 319 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
c8f6c28a MC |
320 | goto err; |
321 | } | |
322 | ||
323 | /* Safe to cast away const here since we're not "getting" any data */ | |
324 | *p++ = OSSL_PARAM_construct_utf8_string(OSSL_ALG_PARAM_DIGEST, | |
325 | (char *)mdname, 0); | |
326 | if (s->ctx->propq != NULL) | |
327 | *p++ = OSSL_PARAM_construct_utf8_string(OSSL_ALG_PARAM_PROPERTIES, | |
328 | (char *)s->ctx->propq, | |
329 | 0); | |
92760c21 | 330 | |
d4d2f3a4 MC |
331 | if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) { |
332 | /* SSLfatal() already called */ | |
6484776f | 333 | goto err; |
d4d2f3a4 | 334 | } |
6484776f | 335 | |
de9f5b35 | 336 | if (str == s->method->ssl3_enc->server_finished_label) { |
c8f6c28a MC |
337 | *p++ = OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_KEY, |
338 | s->server_finished_secret, | |
339 | hashlen); | |
de9f5b35 | 340 | } else if (SSL_IS_FIRST_HANDSHAKE(s)) { |
c8f6c28a MC |
341 | *p++ = OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_KEY, |
342 | s->client_finished_secret, | |
343 | hashlen); | |
de9f5b35 | 344 | } else { |
de9f5b35 MC |
345 | if (!tls13_derive_finishedkey(s, ssl_handshake_md(s), |
346 | s->client_app_traffic_secret, | |
347 | finsecret, hashlen)) | |
348 | goto err; | |
349 | ||
c8f6c28a MC |
350 | *p++ = OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_KEY, finsecret, |
351 | hashlen); | |
de9f5b35 | 352 | } |
c8f6c28a | 353 | *p++ = OSSL_PARAM_construct_end(); |
6484776f | 354 | |
865adf97 | 355 | ctx = EVP_MAC_CTX_new(hmac); |
c8f6c28a | 356 | if (ctx == NULL |
865adf97 | 357 | || !EVP_MAC_CTX_set_params(ctx, params) |
c8f6c28a MC |
358 | || !EVP_MAC_init(ctx) |
359 | || !EVP_MAC_update(ctx, hash, hashlen) | |
360 | /* outsize as per sizeof(peer_finish_md) */ | |
361 | || !EVP_MAC_final(ctx, out, &hashlen, EVP_MAX_MD_SIZE * 2)) { | |
c48ffbcc | 362 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
6484776f | 363 | goto err; |
d4d2f3a4 | 364 | } |
92760c21 | 365 | |
6484776f MC |
366 | ret = hashlen; |
367 | err: | |
c8f6c28a | 368 | OPENSSL_cleanse(finsecret, sizeof(finsecret)); |
865adf97 | 369 | EVP_MAC_CTX_free(ctx); |
c8f6c28a | 370 | EVP_MAC_free(hmac); |
6484776f | 371 | return ret; |
92760c21 MC |
372 | } |
373 | ||
374 | /* | |
375 | * There isn't really a key block in TLSv1.3, but we still need this function | |
f5ca0b04 | 376 | * for initialising the cipher and hash. Returns 1 on success or 0 on failure. |
92760c21 MC |
377 | */ |
378 | int tls13_setup_key_block(SSL *s) | |
379 | { | |
380 | const EVP_CIPHER *c; | |
381 | const EVP_MD *hash; | |
92760c21 | 382 | |
555cbb32 | 383 | s->session->cipher = s->s3.tmp.new_cipher; |
c8f6c28a MC |
384 | if (!ssl_cipher_get_evp(s->ctx, s->session, &c, &hash, NULL, NULL, NULL, |
385 | 0)) { | |
c48ffbcc | 386 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_CIPHER_OR_HASH_UNAVAILABLE); |
92760c21 MC |
387 | return 0; |
388 | } | |
389 | ||
c8f6c28a | 390 | ssl_evp_cipher_free(s->s3.tmp.new_sym_enc); |
555cbb32 | 391 | s->s3.tmp.new_sym_enc = c; |
c8f6c28a | 392 | ssl_evp_md_free(s->s3.tmp.new_hash); |
555cbb32 | 393 | s->s3.tmp.new_hash = hash; |
92760c21 MC |
394 | |
395 | return 1; | |
396 | } | |
397 | ||
d1186c30 | 398 | static int derive_secret_key_and_iv(SSL *s, int sending, const EVP_MD *md, |
d49e23ec | 399 | const EVP_CIPHER *ciph, |
57389a32 MC |
400 | const unsigned char *insecret, |
401 | const unsigned char *hash, | |
402 | const unsigned char *label, | |
403 | size_t labellen, unsigned char *secret, | |
cc10b56d VF |
404 | unsigned char *key, unsigned char *iv, |
405 | EVP_CIPHER_CTX *ciph_ctx) | |
57389a32 | 406 | { |
57389a32 | 407 | size_t ivlen, keylen, taglen; |
bceae201 MC |
408 | int hashleni = EVP_MD_size(md); |
409 | size_t hashlen; | |
410 | ||
411 | /* Ensure cast to size_t is safe */ | |
412 | if (!ossl_assert(hashleni >= 0)) { | |
c48ffbcc | 413 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB); |
cc10b56d | 414 | return 0; |
bceae201 MC |
415 | } |
416 | hashlen = (size_t)hashleni; | |
57389a32 | 417 | |
a19ae67d | 418 | if (!tls13_hkdf_expand(s, md, insecret, label, labellen, hash, hashlen, |
0fb2815b | 419 | secret, hashlen, 1)) { |
f63a17d6 | 420 | /* SSLfatal() already called */ |
cc10b56d | 421 | return 0; |
57389a32 MC |
422 | } |
423 | ||
424 | /* TODO(size_t): convert me */ | |
425 | keylen = EVP_CIPHER_key_length(ciph); | |
426 | if (EVP_CIPHER_mode(ciph) == EVP_CIPH_CCM_MODE) { | |
c117af67 MC |
427 | uint32_t algenc; |
428 | ||
57389a32 | 429 | ivlen = EVP_CCM_TLS_IV_LEN; |
2e1a4f6a | 430 | if (s->s3.tmp.new_cipher != NULL) { |
431 | algenc = s->s3.tmp.new_cipher->algorithm_enc; | |
432 | } else if (s->session->cipher != NULL) { | |
c117af67 MC |
433 | /* We've not selected a cipher yet - we must be doing early data */ |
434 | algenc = s->session->cipher->algorithm_enc; | |
2e1a4f6a | 435 | } else if (s->psksession != NULL && s->psksession->cipher != NULL) { |
436 | /* We must be doing early data with out-of-band PSK */ | |
437 | algenc = s->psksession->cipher->algorithm_enc; | |
c117af67 | 438 | } else { |
c48ffbcc | 439 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB); |
cc10b56d | 440 | return 0; |
c117af67 MC |
441 | } |
442 | if (algenc & (SSL_AES128CCM8 | SSL_AES256CCM8)) | |
57389a32 MC |
443 | taglen = EVP_CCM8_TLS_TAG_LEN; |
444 | else | |
445 | taglen = EVP_CCM_TLS_TAG_LEN; | |
446 | } else { | |
447 | ivlen = EVP_CIPHER_iv_length(ciph); | |
448 | taglen = 0; | |
449 | } | |
450 | ||
d49e23ec MC |
451 | if (!tls13_derive_key(s, md, secret, key, keylen) |
452 | || !tls13_derive_iv(s, md, secret, iv, ivlen)) { | |
f63a17d6 | 453 | /* SSLfatal() already called */ |
cc10b56d | 454 | return 0; |
57389a32 MC |
455 | } |
456 | ||
d1186c30 | 457 | if (EVP_CipherInit_ex(ciph_ctx, ciph, NULL, NULL, NULL, sending) <= 0 |
57389a32 MC |
458 | || !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_IVLEN, ivlen, NULL) |
459 | || (taglen != 0 && !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_TAG, | |
460 | taglen, NULL)) | |
461 | || EVP_CipherInit_ex(ciph_ctx, NULL, NULL, key, NULL, -1) <= 0) { | |
c48ffbcc | 462 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB); |
cc10b56d | 463 | return 0; |
57389a32 MC |
464 | } |
465 | ||
57389a32 | 466 | return 1; |
57389a32 MC |
467 | } |
468 | ||
0d9824c1 MC |
469 | int tls13_change_cipher_state(SSL *s, int which) |
470 | { | |
48102247 | 471 | #ifdef CHARSET_EBCDIC |
472 | static const unsigned char client_early_traffic[] = {0x63, 0x20, 0x65, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00}; | |
473 | static const unsigned char client_handshake_traffic[] = {0x63, 0x20, 0x68, 0x73, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00}; | |
474 | static const unsigned char client_application_traffic[] = {0x63, 0x20, 0x61, 0x70, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00}; | |
475 | static const unsigned char server_handshake_traffic[] = {0x73, 0x20, 0x68, 0x73, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00}; | |
476 | static const unsigned char server_application_traffic[] = {0x73, 0x20, 0x61, 0x70, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00}; | |
477 | static const unsigned char exporter_master_secret[] = {0x65, 0x78, 0x70, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00}; | |
478 | static const unsigned char resumption_master_secret[] = {0x72, 0x65, 0x73, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00}; | |
479 | static const unsigned char early_exporter_master_secret[] = {0x65, 0x20, 0x65, 0x78, 0x70, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00}; | |
480 | #else | |
17aa119e MC |
481 | static const unsigned char client_early_traffic[] = "c e traffic"; |
482 | static const unsigned char client_handshake_traffic[] = "c hs traffic"; | |
483 | static const unsigned char client_application_traffic[] = "c ap traffic"; | |
484 | static const unsigned char server_handshake_traffic[] = "s hs traffic"; | |
485 | static const unsigned char server_application_traffic[] = "s ap traffic"; | |
0ca8d1ec | 486 | static const unsigned char exporter_master_secret[] = "exp master"; |
17aa119e | 487 | static const unsigned char resumption_master_secret[] = "res master"; |
b38ede80 | 488 | static const unsigned char early_exporter_master_secret[] = "e exp master"; |
48102247 | 489 | #endif |
bebc0c7d | 490 | unsigned char *iv; |
cc10b56d | 491 | unsigned char key[EVP_MAX_KEY_LENGTH]; |
0d9824c1 | 492 | unsigned char secret[EVP_MAX_MD_SIZE]; |
ace081c1 MC |
493 | unsigned char hashval[EVP_MAX_MD_SIZE]; |
494 | unsigned char *hash = hashval; | |
0d9824c1 | 495 | unsigned char *insecret; |
6484776f | 496 | unsigned char *finsecret = NULL; |
2c7bd692 | 497 | const char *log_label = NULL; |
0d9824c1 | 498 | EVP_CIPHER_CTX *ciph_ctx; |
57389a32 | 499 | size_t finsecretlen = 0; |
0d9824c1 | 500 | const unsigned char *label; |
ace081c1 | 501 | size_t labellen, hashlen = 0; |
6530c490 | 502 | int ret = 0; |
42f50fdf MC |
503 | const EVP_MD *md = NULL; |
504 | const EVP_CIPHER *cipher = NULL; | |
cc10b56d | 505 | #if !defined(OPENSSL_NO_KTLS) && defined(OPENSSL_KTLS_TLS13) |
c34ca13a | 506 | ktls_crypto_info_t crypto_info; |
cc10b56d | 507 | BIO *bio; |
cc10b56d | 508 | #endif |
0d9824c1 MC |
509 | |
510 | if (which & SSL3_CC_READ) { | |
511 | if (s->enc_read_ctx != NULL) { | |
512 | EVP_CIPHER_CTX_reset(s->enc_read_ctx); | |
513 | } else { | |
514 | s->enc_read_ctx = EVP_CIPHER_CTX_new(); | |
515 | if (s->enc_read_ctx == NULL) { | |
c48ffbcc | 516 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE); |
0d9824c1 MC |
517 | goto err; |
518 | } | |
519 | } | |
520 | ciph_ctx = s->enc_read_ctx; | |
bebc0c7d | 521 | iv = s->read_iv; |
0d9824c1 MC |
522 | |
523 | RECORD_LAYER_reset_read_sequence(&s->rlayer); | |
524 | } else { | |
7426cd34 | 525 | s->statem.enc_write_state = ENC_WRITE_STATE_INVALID; |
0d9824c1 MC |
526 | if (s->enc_write_ctx != NULL) { |
527 | EVP_CIPHER_CTX_reset(s->enc_write_ctx); | |
528 | } else { | |
529 | s->enc_write_ctx = EVP_CIPHER_CTX_new(); | |
530 | if (s->enc_write_ctx == NULL) { | |
c48ffbcc | 531 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE); |
0d9824c1 MC |
532 | goto err; |
533 | } | |
534 | } | |
535 | ciph_ctx = s->enc_write_ctx; | |
bebc0c7d | 536 | iv = s->write_iv; |
0d9824c1 MC |
537 | |
538 | RECORD_LAYER_reset_write_sequence(&s->rlayer); | |
539 | } | |
540 | ||
541 | if (((which & SSL3_CC_CLIENT) && (which & SSL3_CC_WRITE)) | |
542 | || ((which & SSL3_CC_SERVER) && (which & SSL3_CC_READ))) { | |
d49e23ec MC |
543 | if (which & SSL3_CC_EARLY) { |
544 | EVP_MD_CTX *mdctx = NULL; | |
545 | long handlen; | |
546 | void *hdata; | |
547 | unsigned int hashlenui; | |
548 | const SSL_CIPHER *sslcipher = SSL_SESSION_get0_cipher(s->session); | |
549 | ||
550 | insecret = s->early_secret; | |
551 | label = client_early_traffic; | |
552 | labellen = sizeof(client_early_traffic) - 1; | |
553 | log_label = CLIENT_EARLY_LABEL; | |
554 | ||
555cbb32 | 555 | handlen = BIO_get_mem_data(s->s3.handshake_buffer, &hdata); |
d49e23ec | 556 | if (handlen <= 0) { |
c48ffbcc | 557 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_LENGTH); |
d49e23ec MC |
558 | goto err; |
559 | } | |
add8d0e9 | 560 | |
08717544 MC |
561 | if (s->early_data_state == SSL_EARLY_DATA_CONNECTING |
562 | && s->max_early_data > 0 | |
563 | && s->session->ext.max_early_data == 0) { | |
564 | /* | |
565 | * If we are attempting to send early data, and we've decided to | |
566 | * actually do it but max_early_data in s->session is 0 then we | |
567 | * must be using an external PSK. | |
568 | */ | |
569 | if (!ossl_assert(s->psksession != NULL | |
570 | && s->max_early_data == | |
571 | s->psksession->ext.max_early_data)) { | |
c48ffbcc | 572 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
08717544 MC |
573 | goto err; |
574 | } | |
add8d0e9 | 575 | sslcipher = SSL_SESSION_get0_cipher(s->psksession); |
08717544 | 576 | } |
d49e23ec | 577 | if (sslcipher == NULL) { |
c48ffbcc | 578 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_PSK); |
d49e23ec MC |
579 | goto err; |
580 | } | |
581 | ||
582 | /* | |
583 | * We need to calculate the handshake digest using the digest from | |
584 | * the session. We haven't yet selected our ciphersuite so we can't | |
585 | * use ssl_handshake_md(). | |
586 | */ | |
587 | mdctx = EVP_MD_CTX_new(); | |
588 | if (mdctx == NULL) { | |
c48ffbcc | 589 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE); |
d49e23ec MC |
590 | goto err; |
591 | } | |
9727f4e7 MC |
592 | |
593 | /* | |
594 | * This ups the ref count on cipher so we better make sure we free | |
595 | * it again | |
596 | */ | |
597 | if (!ssl_cipher_get_evp_cipher(s->ctx, sslcipher, &cipher)) { | |
598 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, | |
9727f4e7 | 599 | SSL_R_ALGORITHM_FETCH_FAILED); |
67d744b9 | 600 | EVP_MD_CTX_free(mdctx); |
9727f4e7 MC |
601 | goto err; |
602 | } | |
603 | ||
c8f6c28a | 604 | md = ssl_md(s->ctx, sslcipher->algorithm2); |
d49e23ec MC |
605 | if (md == NULL || !EVP_DigestInit_ex(mdctx, md, NULL) |
606 | || !EVP_DigestUpdate(mdctx, hdata, handlen) | |
607 | || !EVP_DigestFinal_ex(mdctx, hashval, &hashlenui)) { | |
c48ffbcc | 608 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
d49e23ec MC |
609 | EVP_MD_CTX_free(mdctx); |
610 | goto err; | |
611 | } | |
612 | hashlen = hashlenui; | |
613 | EVP_MD_CTX_free(mdctx); | |
b38ede80 TT |
614 | |
615 | if (!tls13_hkdf_expand(s, md, insecret, | |
616 | early_exporter_master_secret, | |
617 | sizeof(early_exporter_master_secret) - 1, | |
618 | hashval, hashlen, | |
0fb2815b MC |
619 | s->early_exporter_master_secret, hashlen, |
620 | 1)) { | |
c48ffbcc | 621 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
b38ede80 TT |
622 | goto err; |
623 | } | |
01a2a654 PW |
624 | |
625 | if (!ssl_log_secret(s, EARLY_EXPORTER_SECRET_LABEL, | |
626 | s->early_exporter_master_secret, hashlen)) { | |
627 | /* SSLfatal() already called */ | |
628 | goto err; | |
629 | } | |
d49e23ec | 630 | } else if (which & SSL3_CC_HANDSHAKE) { |
0d9824c1 | 631 | insecret = s->handshake_secret; |
6484776f | 632 | finsecret = s->client_finished_secret; |
6612d87b | 633 | finsecretlen = EVP_MD_size(ssl_handshake_md(s)); |
0d9824c1 MC |
634 | label = client_handshake_traffic; |
635 | labellen = sizeof(client_handshake_traffic) - 1; | |
2c7bd692 | 636 | log_label = CLIENT_HANDSHAKE_LABEL; |
fe5e20fd | 637 | /* |
69687aa8 | 638 | * The handshake hash used for the server read/client write handshake |
f7e393be MC |
639 | * traffic secret is the same as the hash for the server |
640 | * write/client read handshake traffic secret. However, if we | |
641 | * processed early data then we delay changing the server | |
642 | * read/client write cipher state until later, and the handshake | |
643 | * hashes have moved on. Therefore we use the value saved earlier | |
644 | * when we did the server write/client read change cipher state. | |
fe5e20fd | 645 | */ |
f7e393be | 646 | hash = s->handshake_traffic_hash; |
0d9824c1 | 647 | } else { |
ec15acb6 | 648 | insecret = s->master_secret; |
0d9824c1 MC |
649 | label = client_application_traffic; |
650 | labellen = sizeof(client_application_traffic) - 1; | |
2c7bd692 | 651 | log_label = CLIENT_APPLICATION_LABEL; |
ace081c1 MC |
652 | /* |
653 | * For this we only use the handshake hashes up until the server | |
654 | * Finished hash. We do not include the client's Finished, which is | |
655 | * what ssl_handshake_hash() would give us. Instead we use the | |
656 | * previously saved value. | |
657 | */ | |
658 | hash = s->server_finished_hash; | |
0d9824c1 MC |
659 | } |
660 | } else { | |
d49e23ec | 661 | /* Early data never applies to client-read/server-write */ |
0d9824c1 MC |
662 | if (which & SSL3_CC_HANDSHAKE) { |
663 | insecret = s->handshake_secret; | |
6484776f | 664 | finsecret = s->server_finished_secret; |
6612d87b | 665 | finsecretlen = EVP_MD_size(ssl_handshake_md(s)); |
0d9824c1 MC |
666 | label = server_handshake_traffic; |
667 | labellen = sizeof(server_handshake_traffic) - 1; | |
2c7bd692 | 668 | log_label = SERVER_HANDSHAKE_LABEL; |
0d9824c1 | 669 | } else { |
ec15acb6 | 670 | insecret = s->master_secret; |
0d9824c1 MC |
671 | label = server_application_traffic; |
672 | labellen = sizeof(server_application_traffic) - 1; | |
2c7bd692 | 673 | log_label = SERVER_APPLICATION_LABEL; |
0d9824c1 MC |
674 | } |
675 | } | |
676 | ||
d49e23ec MC |
677 | if (!(which & SSL3_CC_EARLY)) { |
678 | md = ssl_handshake_md(s); | |
555cbb32 | 679 | cipher = s->s3.tmp.new_sym_enc; |
d49e23ec MC |
680 | if (!ssl3_digest_cached_records(s, 1) |
681 | || !ssl_handshake_hash(s, hashval, sizeof(hashval), &hashlen)) { | |
f63a17d6 | 682 | /* SSLfatal() already called */; |
d49e23ec MC |
683 | goto err; |
684 | } | |
ace081c1 MC |
685 | } |
686 | ||
ec15acb6 MC |
687 | /* |
688 | * Save the hash of handshakes up to now for use when we calculate the | |
689 | * client application traffic secret | |
690 | */ | |
691 | if (label == server_application_traffic) | |
692 | memcpy(s->server_finished_hash, hashval, hashlen); | |
693 | ||
f7e393be | 694 | if (label == server_handshake_traffic) |
fe5e20fd MC |
695 | memcpy(s->handshake_traffic_hash, hashval, hashlen); |
696 | ||
ec15acb6 MC |
697 | if (label == client_application_traffic) { |
698 | /* | |
699 | * We also create the resumption master secret, but this time use the | |
700 | * hash for the whole handshake including the Client Finished | |
701 | */ | |
702 | if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret, | |
703 | resumption_master_secret, | |
704 | sizeof(resumption_master_secret) - 1, | |
4ff1a526 | 705 | hashval, hashlen, s->resumption_master_secret, |
0fb2815b | 706 | hashlen, 1)) { |
f63a17d6 | 707 | /* SSLfatal() already called */ |
ec15acb6 MC |
708 | goto err; |
709 | } | |
ec15acb6 MC |
710 | } |
711 | ||
cc10b56d VF |
712 | /* check whether cipher is known */ |
713 | if(!ossl_assert(cipher != NULL)) | |
714 | goto err; | |
715 | ||
d49e23ec | 716 | if (!derive_secret_key_and_iv(s, which & SSL3_CC_WRITE, md, cipher, |
cc10b56d VF |
717 | insecret, hash, label, labellen, secret, key, |
718 | iv, ciph_ctx)) { | |
f63a17d6 | 719 | /* SSLfatal() already called */ |
57389a32 | 720 | goto err; |
ec07b1d8 | 721 | } |
0d9824c1 | 722 | |
2221ec10 | 723 | if (label == server_application_traffic) { |
57389a32 | 724 | memcpy(s->server_app_traffic_secret, secret, hashlen); |
2221ec10 TT |
725 | /* Now we create the exporter master secret */ |
726 | if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret, | |
727 | exporter_master_secret, | |
728 | sizeof(exporter_master_secret) - 1, | |
729 | hash, hashlen, s->exporter_master_secret, | |
0fb2815b | 730 | hashlen, 1)) { |
2221ec10 TT |
731 | /* SSLfatal() already called */ |
732 | goto err; | |
733 | } | |
6329ce8f PW |
734 | |
735 | if (!ssl_log_secret(s, EXPORTER_SECRET_LABEL, s->exporter_master_secret, | |
736 | hashlen)) { | |
737 | /* SSLfatal() already called */ | |
738 | goto err; | |
739 | } | |
2221ec10 | 740 | } else if (label == client_application_traffic) |
57389a32 MC |
741 | memcpy(s->client_app_traffic_secret, secret, hashlen); |
742 | ||
2c7bd692 | 743 | if (!ssl_log_secret(s, log_label, secret, hashlen)) { |
f63a17d6 | 744 | /* SSLfatal() already called */ |
2c7bd692 CB |
745 | goto err; |
746 | } | |
747 | ||
57389a32 MC |
748 | if (finsecret != NULL |
749 | && !tls13_derive_finishedkey(s, ssl_handshake_md(s), secret, | |
750 | finsecret, finsecretlen)) { | |
f63a17d6 | 751 | /* SSLfatal() already called */ |
0d9824c1 MC |
752 | goto err; |
753 | } | |
754 | ||
7426cd34 MC |
755 | if (!s->server && label == client_early_traffic) |
756 | s->statem.enc_write_state = ENC_WRITE_STATE_WRITE_PLAIN_ALERTS; | |
757 | else | |
758 | s->statem.enc_write_state = ENC_WRITE_STATE_VALID; | |
cc10b56d VF |
759 | #ifndef OPENSSL_NO_KTLS |
760 | # if defined(OPENSSL_KTLS_TLS13) | |
cc10b56d VF |
761 | if (!(which & SSL3_CC_WRITE) || !(which & SSL3_CC_APPLICATION) |
762 | || ((which & SSL3_CC_WRITE) && (s->mode & SSL_MODE_NO_KTLS_TX))) | |
763 | goto skip_ktls; | |
764 | ||
765 | /* ktls supports only the maximum fragment size */ | |
766 | if (ssl_get_max_send_fragment(s) != SSL3_RT_MAX_PLAIN_LENGTH) | |
767 | goto skip_ktls; | |
768 | ||
769 | /* ktls does not support record padding */ | |
770 | if (s->record_padding_cb != NULL) | |
771 | goto skip_ktls; | |
772 | ||
773 | /* check that cipher is supported */ | |
3e582606 | 774 | if (!ktls_check_supported_cipher(s, cipher, ciph_ctx)) |
cc10b56d VF |
775 | goto skip_ktls; |
776 | ||
777 | bio = s->wbio; | |
778 | ||
779 | if (!ossl_assert(bio != NULL)) { | |
c48ffbcc | 780 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
cc10b56d VF |
781 | goto err; |
782 | } | |
783 | ||
784 | /* All future data will get encrypted by ktls. Flush the BIO or skip ktls */ | |
785 | if (BIO_flush(bio) <= 0) | |
786 | goto skip_ktls; | |
787 | ||
788 | /* configure kernel crypto structure */ | |
3e582606 | 789 | if (!ktls_configure_crypto(s, cipher, ciph_ctx, |
cc10b56d | 790 | RECORD_LAYER_get_write_sequence(&s->rlayer), |
3e582606 | 791 | &crypto_info, NULL, iv, key, NULL, 0)) |
cc10b56d VF |
792 | goto skip_ktls; |
793 | ||
794 | /* ktls works with user provided buffers directly */ | |
795 | if (BIO_set_ktls(bio, &crypto_info, which & SSL3_CC_WRITE)) | |
796 | ssl3_release_write_buffer(s); | |
cc10b56d VF |
797 | skip_ktls: |
798 | # endif | |
799 | #endif | |
57389a32 MC |
800 | ret = 1; |
801 | err: | |
9727f4e7 MC |
802 | if ((which & SSL3_CC_EARLY) != 0) { |
803 | /* We up-refed this so now we need to down ref */ | |
804 | ssl_evp_cipher_free(cipher); | |
805 | } | |
cc10b56d | 806 | OPENSSL_cleanse(key, sizeof(key)); |
57389a32 MC |
807 | OPENSSL_cleanse(secret, sizeof(secret)); |
808 | return ret; | |
809 | } | |
0d9824c1 | 810 | |
d1186c30 | 811 | int tls13_update_key(SSL *s, int sending) |
57389a32 | 812 | { |
48102247 | 813 | #ifdef CHARSET_EBCDIC |
814 | static const unsigned char application_traffic[] = { 0x74, 0x72 ,0x61 ,0x66 ,0x66 ,0x69 ,0x63 ,0x20 ,0x75 ,0x70 ,0x64, 0x00}; | |
815 | #else | |
816 | static const unsigned char application_traffic[] = "traffic upd"; | |
817 | #endif | |
57389a32 MC |
818 | const EVP_MD *md = ssl_handshake_md(s); |
819 | size_t hashlen = EVP_MD_size(md); | |
cc10b56d | 820 | unsigned char key[EVP_MAX_KEY_LENGTH]; |
57389a32 MC |
821 | unsigned char *insecret, *iv; |
822 | unsigned char secret[EVP_MAX_MD_SIZE]; | |
823 | EVP_CIPHER_CTX *ciph_ctx; | |
824 | int ret = 0; | |
0d9824c1 | 825 | |
d1186c30 | 826 | if (s->server == sending) |
57389a32 MC |
827 | insecret = s->server_app_traffic_secret; |
828 | else | |
829 | insecret = s->client_app_traffic_secret; | |
bebc0c7d | 830 | |
d1186c30 | 831 | if (sending) { |
7426cd34 | 832 | s->statem.enc_write_state = ENC_WRITE_STATE_INVALID; |
57389a32 MC |
833 | iv = s->write_iv; |
834 | ciph_ctx = s->enc_write_ctx; | |
835 | RECORD_LAYER_reset_write_sequence(&s->rlayer); | |
836 | } else { | |
837 | iv = s->read_iv; | |
838 | ciph_ctx = s->enc_read_ctx; | |
839 | RECORD_LAYER_reset_read_sequence(&s->rlayer); | |
0d9824c1 | 840 | } |
57389a32 | 841 | |
d1186c30 | 842 | if (!derive_secret_key_and_iv(s, sending, ssl_handshake_md(s), |
555cbb32 | 843 | s->s3.tmp.new_sym_enc, insecret, NULL, |
d49e23ec | 844 | application_traffic, |
cc10b56d VF |
845 | sizeof(application_traffic) - 1, secret, key, |
846 | iv, ciph_ctx)) { | |
f63a17d6 | 847 | /* SSLfatal() already called */ |
57389a32 | 848 | goto err; |
f63a17d6 | 849 | } |
57389a32 MC |
850 | |
851 | memcpy(insecret, secret, hashlen); | |
0d9824c1 | 852 | |
7426cd34 | 853 | s->statem.enc_write_state = ENC_WRITE_STATE_VALID; |
6530c490 | 854 | ret = 1; |
0d9824c1 | 855 | err: |
cc10b56d | 856 | OPENSSL_cleanse(key, sizeof(key)); |
0d9824c1 | 857 | OPENSSL_cleanse(secret, sizeof(secret)); |
6530c490 | 858 | return ret; |
0d9824c1 | 859 | } |
04904312 MC |
860 | |
861 | int tls13_alert_code(int code) | |
862 | { | |
43a0f273 MC |
863 | /* There are 2 additional alerts in TLSv1.3 compared to TLSv1.2 */ |
864 | if (code == SSL_AD_MISSING_EXTENSION || code == SSL_AD_CERTIFICATE_REQUIRED) | |
04904312 MC |
865 | return code; |
866 | ||
867 | return tls1_alert_code(code); | |
868 | } | |
0ca8d1ec MC |
869 | |
870 | int tls13_export_keying_material(SSL *s, unsigned char *out, size_t olen, | |
871 | const char *label, size_t llen, | |
872 | const unsigned char *context, | |
873 | size_t contextlen, int use_context) | |
874 | { | |
875 | unsigned char exportsecret[EVP_MAX_MD_SIZE]; | |
48102247 | 876 | #ifdef CHARSET_EBCDIC |
877 | static const unsigned char exporterlabel[] = {0x65, 0x78, 0x70, 0x6F, 0x72, 0x74, 0x65, 0x72, 0x00}; | |
878 | #else | |
0ca8d1ec | 879 | static const unsigned char exporterlabel[] = "exporter"; |
48102247 | 880 | #endif |
c8b93876 | 881 | unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE]; |
0ca8d1ec MC |
882 | const EVP_MD *md = ssl_handshake_md(s); |
883 | EVP_MD_CTX *ctx = EVP_MD_CTX_new(); | |
c8b93876 | 884 | unsigned int hashsize, datalen; |
0ca8d1ec MC |
885 | int ret = 0; |
886 | ||
1f5878b8 | 887 | if (ctx == NULL || !ossl_statem_export_allowed(s)) |
0ca8d1ec MC |
888 | goto err; |
889 | ||
890 | if (!use_context) | |
891 | contextlen = 0; | |
892 | ||
893 | if (EVP_DigestInit_ex(ctx, md, NULL) <= 0 | |
894 | || EVP_DigestUpdate(ctx, context, contextlen) <= 0 | |
895 | || EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0 | |
c8b93876 TT |
896 | || EVP_DigestInit_ex(ctx, md, NULL) <= 0 |
897 | || EVP_DigestFinal_ex(ctx, data, &datalen) <= 0 | |
0ca8d1ec | 898 | || !tls13_hkdf_expand(s, md, s->exporter_master_secret, |
c8b93876 | 899 | (const unsigned char *)label, llen, |
0fb2815b | 900 | data, datalen, exportsecret, hashsize, 0) |
0ca8d1ec | 901 | || !tls13_hkdf_expand(s, md, exportsecret, exporterlabel, |
a19ae67d | 902 | sizeof(exporterlabel) - 1, hash, hashsize, |
0fb2815b | 903 | out, olen, 0)) |
0ca8d1ec MC |
904 | goto err; |
905 | ||
906 | ret = 1; | |
907 | err: | |
908 | EVP_MD_CTX_free(ctx); | |
909 | return ret; | |
910 | } | |
b38ede80 TT |
911 | |
912 | int tls13_export_keying_material_early(SSL *s, unsigned char *out, size_t olen, | |
913 | const char *label, size_t llen, | |
914 | const unsigned char *context, | |
915 | size_t contextlen) | |
916 | { | |
48102247 | 917 | #ifdef CHARSET_EBCDIC |
918 | static const unsigned char exporterlabel[] = {0x65, 0x78, 0x70, 0x6F, 0x72, 0x74, 0x65, 0x72, 0x00}; | |
919 | #else | |
920 | static const unsigned char exporterlabel[] = "exporter"; | |
921 | #endif | |
b38ede80 TT |
922 | unsigned char exportsecret[EVP_MAX_MD_SIZE]; |
923 | unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE]; | |
924 | const EVP_MD *md; | |
925 | EVP_MD_CTX *ctx = EVP_MD_CTX_new(); | |
926 | unsigned int hashsize, datalen; | |
927 | int ret = 0; | |
928 | const SSL_CIPHER *sslcipher; | |
929 | ||
930 | if (ctx == NULL || !ossl_statem_export_early_allowed(s)) | |
931 | goto err; | |
932 | ||
933 | if (!s->server && s->max_early_data > 0 | |
934 | && s->session->ext.max_early_data == 0) | |
935 | sslcipher = SSL_SESSION_get0_cipher(s->psksession); | |
936 | else | |
937 | sslcipher = SSL_SESSION_get0_cipher(s->session); | |
938 | ||
c8f6c28a | 939 | md = ssl_md(s->ctx, sslcipher->algorithm2); |
b38ede80 TT |
940 | |
941 | /* | |
942 | * Calculate the hash value and store it in |data|. The reason why | |
943 | * the empty string is used is that the definition of TLS-Exporter | |
944 | * is like so: | |
945 | * | |
946 | * TLS-Exporter(label, context_value, key_length) = | |
947 | * HKDF-Expand-Label(Derive-Secret(Secret, label, ""), | |
948 | * "exporter", Hash(context_value), key_length) | |
949 | * | |
950 | * Derive-Secret(Secret, Label, Messages) = | |
951 | * HKDF-Expand-Label(Secret, Label, | |
952 | * Transcript-Hash(Messages), Hash.length) | |
953 | * | |
954 | * Here Transcript-Hash is the cipher suite hash algorithm. | |
955 | */ | |
956 | if (EVP_DigestInit_ex(ctx, md, NULL) <= 0 | |
957 | || EVP_DigestUpdate(ctx, context, contextlen) <= 0 | |
958 | || EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0 | |
959 | || EVP_DigestInit_ex(ctx, md, NULL) <= 0 | |
960 | || EVP_DigestFinal_ex(ctx, data, &datalen) <= 0 | |
961 | || !tls13_hkdf_expand(s, md, s->early_exporter_master_secret, | |
962 | (const unsigned char *)label, llen, | |
0fb2815b | 963 | data, datalen, exportsecret, hashsize, 0) |
b38ede80 TT |
964 | || !tls13_hkdf_expand(s, md, exportsecret, exporterlabel, |
965 | sizeof(exporterlabel) - 1, hash, hashsize, | |
0fb2815b | 966 | out, olen, 0)) |
b38ede80 TT |
967 | goto err; |
968 | ||
969 | ret = 1; | |
970 | err: | |
971 | EVP_MD_CTX_free(ctx); | |
972 | return ret; | |
973 | } |