2 * Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
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
11 #include "ssl_local.h"
12 #include "internal/ktls.h"
13 #include "record/record_local.h"
14 #include "internal/cryptlib.h"
15 #include <openssl/evp.h>
16 #include <openssl/kdf.h>
17 #include <openssl/core_names.h>
19 #define TLS13_MAX_LABEL_LEN 249
21 /* Always filled with zeros */
22 static const unsigned char default_zeros[EVP_MAX_MD_SIZE];
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|.
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.
31 int tls13_hkdf_expand(SSL *s, const EVP_MD *md, const unsigned char *secret,
32 const unsigned char *label, size_t labellen,
33 const unsigned char *data, size_t datalen,
34 unsigned char *out, size_t outlen, int fatal)
37 static const unsigned char label_prefix[] = { 0x74, 0x6C, 0x73, 0x31, 0x33, 0x20, 0x00 };
39 static const unsigned char label_prefix[] = "tls13 ";
41 EVP_KDF *kdf = EVP_KDF_fetch(s->ctx->libctx, OSSL_KDF_NAME_HKDF,
44 OSSL_PARAM params[5], *p = params;
45 int mode = EVP_PKEY_HKDEF_MODE_EXPAND_ONLY;
46 const char *mdname = EVP_MD_name(md);
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
55 unsigned char hkdflabel[sizeof(uint16_t) + sizeof(uint8_t)
56 + (sizeof(label_prefix) - 1) + TLS13_MAX_LABEL_LEN
57 + 1 + EVP_MAX_MD_SIZE];
60 kctx = EVP_KDF_CTX_new(kdf);
65 if (labellen > TLS13_MAX_LABEL_LEN) {
67 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
70 * Probably we have been called from SSL_export_keying_material(),
71 * or SSL_export_keying_material_early().
73 ERR_raise(ERR_LIB_SSL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
75 EVP_KDF_CTX_free(kctx);
79 hashlen = EVP_MD_size(md);
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)
87 || !WPACKET_sub_memcpy_u8(&pkt, data, (data == NULL) ? 0 : datalen)
88 || !WPACKET_get_total_written(&pkt, &hkdflabellen)
89 || !WPACKET_finish(&pkt)) {
90 EVP_KDF_CTX_free(kctx);
91 WPACKET_cleanup(&pkt);
93 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
95 ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
99 *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_MODE, &mode);
100 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
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();
108 ret = EVP_KDF_derive(kctx, out, outlen, params) <= 0;
110 EVP_KDF_CTX_free(kctx);
114 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
116 ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
123 * Given a |secret| generate a |key| of length |keylen| bytes. Returns 1 on
124 * success 0 on failure.
126 int tls13_derive_key(SSL *s, const EVP_MD *md, const unsigned char *secret,
127 unsigned char *key, size_t keylen)
129 #ifdef CHARSET_EBCDIC
130 static const unsigned char keylabel[] ={ 0x6B, 0x65, 0x79, 0x00 };
132 static const unsigned char keylabel[] = "key";
135 return tls13_hkdf_expand(s, md, secret, keylabel, sizeof(keylabel) - 1,
136 NULL, 0, key, keylen, 1);
140 * Given a |secret| generate an |iv| of length |ivlen| bytes. Returns 1 on
141 * success 0 on failure.
143 int tls13_derive_iv(SSL *s, const EVP_MD *md, const unsigned char *secret,
144 unsigned char *iv, size_t ivlen)
146 #ifdef CHARSET_EBCDIC
147 static const unsigned char ivlabel[] = { 0x69, 0x76, 0x00 };
149 static const unsigned char ivlabel[] = "iv";
152 return tls13_hkdf_expand(s, md, secret, ivlabel, sizeof(ivlabel) - 1,
153 NULL, 0, iv, ivlen, 1);
156 int tls13_derive_finishedkey(SSL *s, const EVP_MD *md,
157 const unsigned char *secret,
158 unsigned char *fin, size_t finlen)
160 #ifdef CHARSET_EBCDIC
161 static const unsigned char finishedlabel[] = { 0x66, 0x69, 0x6E, 0x69, 0x73, 0x68, 0x65, 0x64, 0x00 };
163 static const unsigned char finishedlabel[] = "finished";
166 return tls13_hkdf_expand(s, md, secret, finishedlabel,
167 sizeof(finishedlabel) - 1, NULL, 0, fin, finlen, 1);
171 * Given the previous secret |prevsecret| and a new input secret |insecret| of
172 * length |insecretlen|, generate a new secret and store it in the location
173 * pointed to by |outsecret|. Returns 1 on success 0 on failure.
175 int tls13_generate_secret(SSL *s, const EVP_MD *md,
176 const unsigned char *prevsecret,
177 const unsigned char *insecret,
179 unsigned char *outsecret)
181 size_t mdlen, prevsecretlen;
186 OSSL_PARAM params[5], *p = params;
187 int mode = EVP_PKEY_HKDEF_MODE_EXTRACT_ONLY;
188 const char *mdname = EVP_MD_name(md);
189 #ifdef CHARSET_EBCDIC
190 static const char derived_secret_label[] = { 0x64, 0x65, 0x72, 0x69, 0x76, 0x65, 0x64, 0x00 };
192 static const char derived_secret_label[] = "derived";
194 unsigned char preextractsec[EVP_MAX_MD_SIZE];
196 kdf = EVP_KDF_fetch(s->ctx->libctx, OSSL_KDF_NAME_HKDF, s->ctx->propq);
197 kctx = EVP_KDF_CTX_new(kdf);
200 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
204 mdleni = EVP_MD_size(md);
205 /* Ensure cast to size_t is safe */
206 if (!ossl_assert(mdleni >= 0)) {
207 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
208 EVP_KDF_CTX_free(kctx);
211 mdlen = (size_t)mdleni;
213 if (insecret == NULL) {
214 insecret = default_zeros;
217 if (prevsecret == NULL) {
218 prevsecret = default_zeros;
221 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
222 unsigned char hash[EVP_MAX_MD_SIZE];
224 /* The pre-extract derive step uses a hash of no messages */
226 || EVP_DigestInit_ex(mctx, md, NULL) <= 0
227 || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) {
228 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
229 EVP_MD_CTX_free(mctx);
230 EVP_KDF_CTX_free(kctx);
233 EVP_MD_CTX_free(mctx);
235 /* Generate the pre-extract secret */
236 if (!tls13_hkdf_expand(s, md, prevsecret,
237 (unsigned char *)derived_secret_label,
238 sizeof(derived_secret_label) - 1, hash, mdlen,
239 preextractsec, mdlen, 1)) {
240 /* SSLfatal() already called */
241 EVP_KDF_CTX_free(kctx);
245 prevsecret = preextractsec;
246 prevsecretlen = mdlen;
249 *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_MODE, &mode);
250 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
252 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
253 (unsigned char *)insecret,
255 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
256 (unsigned char *)prevsecret,
258 *p++ = OSSL_PARAM_construct_end();
260 ret = EVP_KDF_derive(kctx, outsecret, mdlen, params) <= 0;
263 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
265 EVP_KDF_CTX_free(kctx);
266 if (prevsecret == preextractsec)
267 OPENSSL_cleanse(preextractsec, mdlen);
272 * Given an input secret |insecret| of length |insecretlen| generate the
273 * handshake secret. This requires the early secret to already have been
274 * generated. Returns 1 on success 0 on failure.
276 int tls13_generate_handshake_secret(SSL *s, const unsigned char *insecret,
279 /* Calls SSLfatal() if required */
280 return tls13_generate_secret(s, ssl_handshake_md(s), s->early_secret,
281 insecret, insecretlen,
282 (unsigned char *)&s->handshake_secret);
286 * Given the handshake secret |prev| of length |prevlen| generate the master
287 * secret and store its length in |*secret_size|. Returns 1 on success 0 on
290 int tls13_generate_master_secret(SSL *s, unsigned char *out,
291 unsigned char *prev, size_t prevlen,
294 const EVP_MD *md = ssl_handshake_md(s);
296 *secret_size = EVP_MD_size(md);
297 /* Calls SSLfatal() if required */
298 return tls13_generate_secret(s, md, prev, NULL, 0, out);
302 * Generates the mac for the Finished message. Returns the length of the MAC or
305 size_t tls13_final_finish_mac(SSL *s, const char *str, size_t slen,
308 const char *mdname = EVP_MD_name(ssl_handshake_md(s));
309 EVP_MAC *hmac = EVP_MAC_fetch(s->ctx->libctx, "HMAC", s->ctx->propq);
310 unsigned char hash[EVP_MAX_MD_SIZE];
311 unsigned char finsecret[EVP_MAX_MD_SIZE];
312 unsigned char *key = NULL;
313 size_t hashlen, ret = 0;
314 EVP_MAC_CTX *ctx = NULL;
315 OSSL_PARAM params[3], *p = params;
318 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
322 /* Safe to cast away const here since we're not "getting" any data */
323 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_ALG_PARAM_DIGEST,
325 if (s->ctx->propq != NULL)
326 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_ALG_PARAM_PROPERTIES,
327 (char *)s->ctx->propq,
329 *p = OSSL_PARAM_construct_end();
331 if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
332 /* SSLfatal() already called */
336 if (str == s->method->ssl3_enc->server_finished_label) {
337 key = s->server_finished_secret;
338 } else if (SSL_IS_FIRST_HANDSHAKE(s)) {
339 key = s->client_finished_secret;
341 if (!tls13_derive_finishedkey(s, ssl_handshake_md(s),
342 s->client_app_traffic_secret,
348 ctx = EVP_MAC_CTX_new(hmac);
350 || !EVP_MAC_init(ctx, key, hashlen, params)
351 || !EVP_MAC_update(ctx, hash, hashlen)
352 /* outsize as per sizeof(peer_finish_md) */
353 || !EVP_MAC_final(ctx, out, &hashlen, EVP_MAX_MD_SIZE * 2)) {
354 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
360 OPENSSL_cleanse(finsecret, sizeof(finsecret));
361 EVP_MAC_CTX_free(ctx);
367 * There isn't really a key block in TLSv1.3, but we still need this function
368 * for initialising the cipher and hash. Returns 1 on success or 0 on failure.
370 int tls13_setup_key_block(SSL *s)
375 s->session->cipher = s->s3.tmp.new_cipher;
376 if (!ssl_cipher_get_evp(s->ctx, s->session, &c, &hash, NULL, NULL, NULL,
378 /* Error is already recorded */
379 SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
383 ssl_evp_cipher_free(s->s3.tmp.new_sym_enc);
384 s->s3.tmp.new_sym_enc = c;
385 ssl_evp_md_free(s->s3.tmp.new_hash);
386 s->s3.tmp.new_hash = hash;
391 static int derive_secret_key_and_iv(SSL *s, int sending, const EVP_MD *md,
392 const EVP_CIPHER *ciph,
393 const unsigned char *insecret,
394 const unsigned char *hash,
395 const unsigned char *label,
396 size_t labellen, unsigned char *secret,
397 unsigned char *key, unsigned char *iv,
398 EVP_CIPHER_CTX *ciph_ctx)
400 size_t ivlen, keylen, taglen;
401 int hashleni = EVP_MD_size(md);
404 /* Ensure cast to size_t is safe */
405 if (!ossl_assert(hashleni >= 0)) {
406 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
409 hashlen = (size_t)hashleni;
411 if (!tls13_hkdf_expand(s, md, insecret, label, labellen, hash, hashlen,
412 secret, hashlen, 1)) {
413 /* SSLfatal() already called */
417 /* TODO(size_t): convert me */
418 keylen = EVP_CIPHER_key_length(ciph);
419 if (EVP_CIPHER_mode(ciph) == EVP_CIPH_CCM_MODE) {
422 ivlen = EVP_CCM_TLS_IV_LEN;
423 if (s->s3.tmp.new_cipher != NULL) {
424 algenc = s->s3.tmp.new_cipher->algorithm_enc;
425 } else if (s->session->cipher != NULL) {
426 /* We've not selected a cipher yet - we must be doing early data */
427 algenc = s->session->cipher->algorithm_enc;
428 } else if (s->psksession != NULL && s->psksession->cipher != NULL) {
429 /* We must be doing early data with out-of-band PSK */
430 algenc = s->psksession->cipher->algorithm_enc;
432 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
435 if (algenc & (SSL_AES128CCM8 | SSL_AES256CCM8))
436 taglen = EVP_CCM8_TLS_TAG_LEN;
438 taglen = EVP_CCM_TLS_TAG_LEN;
440 ivlen = EVP_CIPHER_iv_length(ciph);
444 if (!tls13_derive_key(s, md, secret, key, keylen)
445 || !tls13_derive_iv(s, md, secret, iv, ivlen)) {
446 /* SSLfatal() already called */
450 if (EVP_CipherInit_ex(ciph_ctx, ciph, NULL, NULL, NULL, sending) <= 0
451 || !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_IVLEN, ivlen, NULL)
452 || (taglen != 0 && !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_TAG,
454 || EVP_CipherInit_ex(ciph_ctx, NULL, NULL, key, NULL, -1) <= 0) {
455 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
462 int tls13_change_cipher_state(SSL *s, int which)
464 #ifdef CHARSET_EBCDIC
465 static const unsigned char client_early_traffic[] = {0x63, 0x20, 0x65, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
466 static const unsigned char client_handshake_traffic[] = {0x63, 0x20, 0x68, 0x73, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
467 static const unsigned char client_application_traffic[] = {0x63, 0x20, 0x61, 0x70, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
468 static const unsigned char server_handshake_traffic[] = {0x73, 0x20, 0x68, 0x73, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
469 static const unsigned char server_application_traffic[] = {0x73, 0x20, 0x61, 0x70, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
470 static const unsigned char exporter_master_secret[] = {0x65, 0x78, 0x70, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00};
471 static const unsigned char resumption_master_secret[] = {0x72, 0x65, 0x73, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00};
472 static const unsigned char early_exporter_master_secret[] = {0x65, 0x20, 0x65, 0x78, 0x70, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00};
474 static const unsigned char client_early_traffic[] = "c e traffic";
475 static const unsigned char client_handshake_traffic[] = "c hs traffic";
476 static const unsigned char client_application_traffic[] = "c ap traffic";
477 static const unsigned char server_handshake_traffic[] = "s hs traffic";
478 static const unsigned char server_application_traffic[] = "s ap traffic";
479 static const unsigned char exporter_master_secret[] = "exp master";
480 static const unsigned char resumption_master_secret[] = "res master";
481 static const unsigned char early_exporter_master_secret[] = "e exp master";
484 unsigned char key[EVP_MAX_KEY_LENGTH];
485 unsigned char secret[EVP_MAX_MD_SIZE];
486 unsigned char hashval[EVP_MAX_MD_SIZE];
487 unsigned char *hash = hashval;
488 unsigned char *insecret;
489 unsigned char *finsecret = NULL;
490 const char *log_label = NULL;
491 EVP_CIPHER_CTX *ciph_ctx;
492 size_t finsecretlen = 0;
493 const unsigned char *label;
494 size_t labellen, hashlen = 0;
496 const EVP_MD *md = NULL;
497 const EVP_CIPHER *cipher = NULL;
498 #if !defined(OPENSSL_NO_KTLS) && defined(OPENSSL_KTLS_TLS13)
499 ktls_crypto_info_t crypto_info;
503 if (which & SSL3_CC_READ) {
504 if (s->enc_read_ctx != NULL) {
505 EVP_CIPHER_CTX_reset(s->enc_read_ctx);
507 s->enc_read_ctx = EVP_CIPHER_CTX_new();
508 if (s->enc_read_ctx == NULL) {
509 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
513 ciph_ctx = s->enc_read_ctx;
516 RECORD_LAYER_reset_read_sequence(&s->rlayer);
518 s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
519 if (s->enc_write_ctx != NULL) {
520 EVP_CIPHER_CTX_reset(s->enc_write_ctx);
522 s->enc_write_ctx = EVP_CIPHER_CTX_new();
523 if (s->enc_write_ctx == NULL) {
524 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
528 ciph_ctx = s->enc_write_ctx;
531 RECORD_LAYER_reset_write_sequence(&s->rlayer);
534 if (((which & SSL3_CC_CLIENT) && (which & SSL3_CC_WRITE))
535 || ((which & SSL3_CC_SERVER) && (which & SSL3_CC_READ))) {
536 if (which & SSL3_CC_EARLY) {
537 EVP_MD_CTX *mdctx = NULL;
540 unsigned int hashlenui;
541 const SSL_CIPHER *sslcipher = SSL_SESSION_get0_cipher(s->session);
543 insecret = s->early_secret;
544 label = client_early_traffic;
545 labellen = sizeof(client_early_traffic) - 1;
546 log_label = CLIENT_EARLY_LABEL;
548 handlen = BIO_get_mem_data(s->s3.handshake_buffer, &hdata);
550 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_LENGTH);
554 if (s->early_data_state == SSL_EARLY_DATA_CONNECTING
555 && s->max_early_data > 0
556 && s->session->ext.max_early_data == 0) {
558 * If we are attempting to send early data, and we've decided to
559 * actually do it but max_early_data in s->session is 0 then we
560 * must be using an external PSK.
562 if (!ossl_assert(s->psksession != NULL
563 && s->max_early_data ==
564 s->psksession->ext.max_early_data)) {
565 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
568 sslcipher = SSL_SESSION_get0_cipher(s->psksession);
570 if (sslcipher == NULL) {
571 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_PSK);
576 * We need to calculate the handshake digest using the digest from
577 * the session. We haven't yet selected our ciphersuite so we can't
578 * use ssl_handshake_md().
580 mdctx = EVP_MD_CTX_new();
582 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
587 * This ups the ref count on cipher so we better make sure we free
590 if (!ssl_cipher_get_evp_cipher(s->ctx, sslcipher, &cipher)) {
591 /* Error is already recorded */
592 SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
593 EVP_MD_CTX_free(mdctx);
597 md = ssl_md(s->ctx, sslcipher->algorithm2);
598 if (md == NULL || !EVP_DigestInit_ex(mdctx, md, NULL)
599 || !EVP_DigestUpdate(mdctx, hdata, handlen)
600 || !EVP_DigestFinal_ex(mdctx, hashval, &hashlenui)) {
601 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
602 EVP_MD_CTX_free(mdctx);
606 EVP_MD_CTX_free(mdctx);
608 if (!tls13_hkdf_expand(s, md, insecret,
609 early_exporter_master_secret,
610 sizeof(early_exporter_master_secret) - 1,
612 s->early_exporter_master_secret, hashlen,
614 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
618 if (!ssl_log_secret(s, EARLY_EXPORTER_SECRET_LABEL,
619 s->early_exporter_master_secret, hashlen)) {
620 /* SSLfatal() already called */
623 } else if (which & SSL3_CC_HANDSHAKE) {
624 insecret = s->handshake_secret;
625 finsecret = s->client_finished_secret;
626 finsecretlen = EVP_MD_size(ssl_handshake_md(s));
627 label = client_handshake_traffic;
628 labellen = sizeof(client_handshake_traffic) - 1;
629 log_label = CLIENT_HANDSHAKE_LABEL;
631 * The handshake hash used for the server read/client write handshake
632 * traffic secret is the same as the hash for the server
633 * write/client read handshake traffic secret. However, if we
634 * processed early data then we delay changing the server
635 * read/client write cipher state until later, and the handshake
636 * hashes have moved on. Therefore we use the value saved earlier
637 * when we did the server write/client read change cipher state.
639 hash = s->handshake_traffic_hash;
641 insecret = s->master_secret;
642 label = client_application_traffic;
643 labellen = sizeof(client_application_traffic) - 1;
644 log_label = CLIENT_APPLICATION_LABEL;
646 * For this we only use the handshake hashes up until the server
647 * Finished hash. We do not include the client's Finished, which is
648 * what ssl_handshake_hash() would give us. Instead we use the
649 * previously saved value.
651 hash = s->server_finished_hash;
654 /* Early data never applies to client-read/server-write */
655 if (which & SSL3_CC_HANDSHAKE) {
656 insecret = s->handshake_secret;
657 finsecret = s->server_finished_secret;
658 finsecretlen = EVP_MD_size(ssl_handshake_md(s));
659 label = server_handshake_traffic;
660 labellen = sizeof(server_handshake_traffic) - 1;
661 log_label = SERVER_HANDSHAKE_LABEL;
663 insecret = s->master_secret;
664 label = server_application_traffic;
665 labellen = sizeof(server_application_traffic) - 1;
666 log_label = SERVER_APPLICATION_LABEL;
670 if (!(which & SSL3_CC_EARLY)) {
671 md = ssl_handshake_md(s);
672 cipher = s->s3.tmp.new_sym_enc;
673 if (!ssl3_digest_cached_records(s, 1)
674 || !ssl_handshake_hash(s, hashval, sizeof(hashval), &hashlen)) {
675 /* SSLfatal() already called */;
681 * Save the hash of handshakes up to now for use when we calculate the
682 * client application traffic secret
684 if (label == server_application_traffic)
685 memcpy(s->server_finished_hash, hashval, hashlen);
687 if (label == server_handshake_traffic)
688 memcpy(s->handshake_traffic_hash, hashval, hashlen);
690 if (label == client_application_traffic) {
692 * We also create the resumption master secret, but this time use the
693 * hash for the whole handshake including the Client Finished
695 if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
696 resumption_master_secret,
697 sizeof(resumption_master_secret) - 1,
698 hashval, hashlen, s->resumption_master_secret,
700 /* SSLfatal() already called */
705 /* check whether cipher is known */
706 if(!ossl_assert(cipher != NULL))
709 if (!derive_secret_key_and_iv(s, which & SSL3_CC_WRITE, md, cipher,
710 insecret, hash, label, labellen, secret, key,
712 /* SSLfatal() already called */
716 if (label == server_application_traffic) {
717 memcpy(s->server_app_traffic_secret, secret, hashlen);
718 /* Now we create the exporter master secret */
719 if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
720 exporter_master_secret,
721 sizeof(exporter_master_secret) - 1,
722 hash, hashlen, s->exporter_master_secret,
724 /* SSLfatal() already called */
728 if (!ssl_log_secret(s, EXPORTER_SECRET_LABEL, s->exporter_master_secret,
730 /* SSLfatal() already called */
733 } else if (label == client_application_traffic)
734 memcpy(s->client_app_traffic_secret, secret, hashlen);
736 if (!ssl_log_secret(s, log_label, secret, hashlen)) {
737 /* SSLfatal() already called */
741 if (finsecret != NULL
742 && !tls13_derive_finishedkey(s, ssl_handshake_md(s), secret,
743 finsecret, finsecretlen)) {
744 /* SSLfatal() already called */
748 if (!s->server && label == client_early_traffic)
749 s->statem.enc_write_state = ENC_WRITE_STATE_WRITE_PLAIN_ALERTS;
751 s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
752 #ifndef OPENSSL_NO_KTLS
753 # if defined(OPENSSL_KTLS_TLS13)
754 if (!(which & SSL3_CC_WRITE)
755 || !(which & SSL3_CC_APPLICATION)
756 || (s->options & SSL_OP_ENABLE_KTLS) == 0)
759 /* ktls supports only the maximum fragment size */
760 if (ssl_get_max_send_fragment(s) != SSL3_RT_MAX_PLAIN_LENGTH)
763 /* ktls does not support record padding */
764 if (s->record_padding_cb != NULL)
767 /* check that cipher is supported */
768 if (!ktls_check_supported_cipher(s, cipher, ciph_ctx))
773 if (!ossl_assert(bio != NULL)) {
774 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
778 /* All future data will get encrypted by ktls. Flush the BIO or skip ktls */
779 if (BIO_flush(bio) <= 0)
782 /* configure kernel crypto structure */
783 if (!ktls_configure_crypto(s, cipher, ciph_ctx,
784 RECORD_LAYER_get_write_sequence(&s->rlayer),
785 &crypto_info, NULL, iv, key, NULL, 0))
788 /* ktls works with user provided buffers directly */
789 if (BIO_set_ktls(bio, &crypto_info, which & SSL3_CC_WRITE))
790 ssl3_release_write_buffer(s);
796 if ((which & SSL3_CC_EARLY) != 0) {
797 /* We up-refed this so now we need to down ref */
798 ssl_evp_cipher_free(cipher);
800 OPENSSL_cleanse(key, sizeof(key));
801 OPENSSL_cleanse(secret, sizeof(secret));
805 int tls13_update_key(SSL *s, int sending)
807 #ifdef CHARSET_EBCDIC
808 static const unsigned char application_traffic[] = { 0x74, 0x72 ,0x61 ,0x66 ,0x66 ,0x69 ,0x63 ,0x20 ,0x75 ,0x70 ,0x64, 0x00};
810 static const unsigned char application_traffic[] = "traffic upd";
812 const EVP_MD *md = ssl_handshake_md(s);
813 size_t hashlen = EVP_MD_size(md);
814 unsigned char key[EVP_MAX_KEY_LENGTH];
815 unsigned char *insecret, *iv;
816 unsigned char secret[EVP_MAX_MD_SIZE];
817 EVP_CIPHER_CTX *ciph_ctx;
820 if (s->server == sending)
821 insecret = s->server_app_traffic_secret;
823 insecret = s->client_app_traffic_secret;
826 s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
828 ciph_ctx = s->enc_write_ctx;
829 RECORD_LAYER_reset_write_sequence(&s->rlayer);
832 ciph_ctx = s->enc_read_ctx;
833 RECORD_LAYER_reset_read_sequence(&s->rlayer);
836 if (!derive_secret_key_and_iv(s, sending, ssl_handshake_md(s),
837 s->s3.tmp.new_sym_enc, insecret, NULL,
839 sizeof(application_traffic) - 1, secret, key,
841 /* SSLfatal() already called */
845 memcpy(insecret, secret, hashlen);
847 s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
850 OPENSSL_cleanse(key, sizeof(key));
851 OPENSSL_cleanse(secret, sizeof(secret));
855 int tls13_alert_code(int code)
857 /* There are 2 additional alerts in TLSv1.3 compared to TLSv1.2 */
858 if (code == SSL_AD_MISSING_EXTENSION || code == SSL_AD_CERTIFICATE_REQUIRED)
861 return tls1_alert_code(code);
864 int tls13_export_keying_material(SSL *s, unsigned char *out, size_t olen,
865 const char *label, size_t llen,
866 const unsigned char *context,
867 size_t contextlen, int use_context)
869 unsigned char exportsecret[EVP_MAX_MD_SIZE];
870 #ifdef CHARSET_EBCDIC
871 static const unsigned char exporterlabel[] = {0x65, 0x78, 0x70, 0x6F, 0x72, 0x74, 0x65, 0x72, 0x00};
873 static const unsigned char exporterlabel[] = "exporter";
875 unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
876 const EVP_MD *md = ssl_handshake_md(s);
877 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
878 unsigned int hashsize, datalen;
881 if (ctx == NULL || !ossl_statem_export_allowed(s))
887 if (EVP_DigestInit_ex(ctx, md, NULL) <= 0
888 || EVP_DigestUpdate(ctx, context, contextlen) <= 0
889 || EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
890 || EVP_DigestInit_ex(ctx, md, NULL) <= 0
891 || EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
892 || !tls13_hkdf_expand(s, md, s->exporter_master_secret,
893 (const unsigned char *)label, llen,
894 data, datalen, exportsecret, hashsize, 0)
895 || !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
896 sizeof(exporterlabel) - 1, hash, hashsize,
902 EVP_MD_CTX_free(ctx);
906 int tls13_export_keying_material_early(SSL *s, unsigned char *out, size_t olen,
907 const char *label, size_t llen,
908 const unsigned char *context,
911 #ifdef CHARSET_EBCDIC
912 static const unsigned char exporterlabel[] = {0x65, 0x78, 0x70, 0x6F, 0x72, 0x74, 0x65, 0x72, 0x00};
914 static const unsigned char exporterlabel[] = "exporter";
916 unsigned char exportsecret[EVP_MAX_MD_SIZE];
917 unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
919 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
920 unsigned int hashsize, datalen;
922 const SSL_CIPHER *sslcipher;
924 if (ctx == NULL || !ossl_statem_export_early_allowed(s))
927 if (!s->server && s->max_early_data > 0
928 && s->session->ext.max_early_data == 0)
929 sslcipher = SSL_SESSION_get0_cipher(s->psksession);
931 sslcipher = SSL_SESSION_get0_cipher(s->session);
933 md = ssl_md(s->ctx, sslcipher->algorithm2);
936 * Calculate the hash value and store it in |data|. The reason why
937 * the empty string is used is that the definition of TLS-Exporter
940 * TLS-Exporter(label, context_value, key_length) =
941 * HKDF-Expand-Label(Derive-Secret(Secret, label, ""),
942 * "exporter", Hash(context_value), key_length)
944 * Derive-Secret(Secret, Label, Messages) =
945 * HKDF-Expand-Label(Secret, Label,
946 * Transcript-Hash(Messages), Hash.length)
948 * Here Transcript-Hash is the cipher suite hash algorithm.
950 if (EVP_DigestInit_ex(ctx, md, NULL) <= 0
951 || EVP_DigestUpdate(ctx, context, contextlen) <= 0
952 || EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
953 || EVP_DigestInit_ex(ctx, md, NULL) <= 0
954 || EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
955 || !tls13_hkdf_expand(s, md, s->early_exporter_master_secret,
956 (const unsigned char *)label, llen,
957 data, datalen, exportsecret, hashsize, 0)
958 || !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
959 sizeof(exporterlabel) - 1, hash, hashsize,
965 EVP_MD_CTX_free(ctx);