2 * Copyright 2016-2022 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
22 static const unsigned char label_prefix
[] = { 0x74, 0x6C, 0x73, 0x31, 0x33, 0x20, 0x00 };
24 static const unsigned char label_prefix
[] = "tls13 ";
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|.
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.
34 int tls13_hkdf_expand(SSL_CONNECTION
*s
, const EVP_MD
*md
,
35 const unsigned char *secret
,
36 const unsigned char *label
, size_t labellen
,
37 const unsigned char *data
, size_t datalen
,
38 unsigned char *out
, size_t outlen
, int fatal
)
40 SSL_CTX
*sctx
= SSL_CONNECTION_GET_CTX(s
);
41 EVP_KDF
*kdf
= EVP_KDF_fetch(sctx
->libctx
, OSSL_KDF_NAME_TLS1_3_KDF
,
44 OSSL_PARAM params
[7], *p
= params
;
45 int mode
= EVP_PKEY_HKDEF_MODE_EXPAND_ONLY
;
46 const char *mdname
= EVP_MD_get0_name(md
);
50 kctx
= EVP_KDF_CTX_new(kdf
);
55 if (labellen
> TLS13_MAX_LABEL_LEN
) {
57 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, ERR_R_INTERNAL_ERROR
);
60 * Probably we have been called from SSL_export_keying_material(),
61 * or SSL_export_keying_material_early().
63 ERR_raise(ERR_LIB_SSL
, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL
);
65 EVP_KDF_CTX_free(kctx
);
69 if ((ret
= EVP_MD_get_size(md
)) <= 0) {
70 EVP_KDF_CTX_free(kctx
);
72 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, ERR_R_INTERNAL_ERROR
);
74 ERR_raise(ERR_LIB_SSL
, ERR_R_INTERNAL_ERROR
);
77 hashlen
= (size_t)ret
;
79 *p
++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_MODE
, &mode
);
80 *p
++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST
,
82 *p
++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY
,
83 (unsigned char *)secret
, hashlen
);
84 *p
++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PREFIX
,
85 (unsigned char *)label_prefix
,
86 sizeof(label_prefix
) - 1);
87 *p
++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_LABEL
,
88 (unsigned char *)label
, labellen
);
90 *p
++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_DATA
,
91 (unsigned char *)data
,
93 *p
++ = OSSL_PARAM_construct_end();
95 ret
= EVP_KDF_derive(kctx
, out
, outlen
, params
) <= 0;
96 EVP_KDF_CTX_free(kctx
);
100 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, ERR_R_INTERNAL_ERROR
);
102 ERR_raise(ERR_LIB_SSL
, ERR_R_INTERNAL_ERROR
);
109 * Given a |secret| generate a |key| of length |keylen| bytes. Returns 1 on
110 * success 0 on failure.
112 int tls13_derive_key(SSL_CONNECTION
*s
, const EVP_MD
*md
,
113 const unsigned char *secret
,
114 unsigned char *key
, size_t keylen
)
116 #ifdef CHARSET_EBCDIC
117 static const unsigned char keylabel
[] ={ 0x6B, 0x65, 0x79, 0x00 };
119 static const unsigned char keylabel
[] = "key";
122 return tls13_hkdf_expand(s
, md
, secret
, keylabel
, sizeof(keylabel
) - 1,
123 NULL
, 0, key
, keylen
, 1);
127 * Given a |secret| generate an |iv| of length |ivlen| bytes. Returns 1 on
128 * success 0 on failure.
130 int tls13_derive_iv(SSL_CONNECTION
*s
, const EVP_MD
*md
,
131 const unsigned char *secret
,
132 unsigned char *iv
, size_t ivlen
)
134 #ifdef CHARSET_EBCDIC
135 static const unsigned char ivlabel
[] = { 0x69, 0x76, 0x00 };
137 static const unsigned char ivlabel
[] = "iv";
140 return tls13_hkdf_expand(s
, md
, secret
, ivlabel
, sizeof(ivlabel
) - 1,
141 NULL
, 0, iv
, ivlen
, 1);
144 int tls13_derive_finishedkey(SSL_CONNECTION
*s
, const EVP_MD
*md
,
145 const unsigned char *secret
,
146 unsigned char *fin
, size_t finlen
)
148 #ifdef CHARSET_EBCDIC
149 static const unsigned char finishedlabel
[] = { 0x66, 0x69, 0x6E, 0x69, 0x73, 0x68, 0x65, 0x64, 0x00 };
151 static const unsigned char finishedlabel
[] = "finished";
154 return tls13_hkdf_expand(s
, md
, secret
, finishedlabel
,
155 sizeof(finishedlabel
) - 1, NULL
, 0, fin
, finlen
, 1);
159 * Given the previous secret |prevsecret| and a new input secret |insecret| of
160 * length |insecretlen|, generate a new secret and store it in the location
161 * pointed to by |outsecret|. Returns 1 on success 0 on failure.
163 int tls13_generate_secret(SSL_CONNECTION
*s
, const EVP_MD
*md
,
164 const unsigned char *prevsecret
,
165 const unsigned char *insecret
,
167 unsigned char *outsecret
)
174 OSSL_PARAM params
[7], *p
= params
;
175 int mode
= EVP_PKEY_HKDEF_MODE_EXTRACT_ONLY
;
176 const char *mdname
= EVP_MD_get0_name(md
);
177 #ifdef CHARSET_EBCDIC
178 static const char derived_secret_label
[] = { 0x64, 0x65, 0x72, 0x69, 0x76, 0x65, 0x64, 0x00 };
180 static const char derived_secret_label
[] = "derived";
182 SSL_CTX
*sctx
= SSL_CONNECTION_GET_CTX(s
);
184 kdf
= EVP_KDF_fetch(sctx
->libctx
, OSSL_KDF_NAME_TLS1_3_KDF
, sctx
->propq
);
185 kctx
= EVP_KDF_CTX_new(kdf
);
188 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, ERR_R_INTERNAL_ERROR
);
192 mdleni
= EVP_MD_get_size(md
);
193 /* Ensure cast to size_t is safe */
194 if (!ossl_assert(mdleni
>= 0)) {
195 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, ERR_R_INTERNAL_ERROR
);
196 EVP_KDF_CTX_free(kctx
);
199 mdlen
= (size_t)mdleni
;
201 *p
++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_MODE
, &mode
);
202 *p
++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST
,
204 if (insecret
!= NULL
)
205 *p
++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY
,
206 (unsigned char *)insecret
,
208 if (prevsecret
!= NULL
)
209 *p
++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT
,
210 (unsigned char *)prevsecret
, mdlen
);
211 *p
++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PREFIX
,
212 (unsigned char *)label_prefix
,
213 sizeof(label_prefix
) - 1);
214 *p
++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_LABEL
,
215 (unsigned char *)derived_secret_label
,
216 sizeof(derived_secret_label
) - 1);
217 *p
++ = OSSL_PARAM_construct_end();
219 ret
= EVP_KDF_derive(kctx
, outsecret
, mdlen
, params
) <= 0;
222 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, ERR_R_INTERNAL_ERROR
);
224 EVP_KDF_CTX_free(kctx
);
229 * Given an input secret |insecret| of length |insecretlen| generate the
230 * handshake secret. This requires the early secret to already have been
231 * generated. Returns 1 on success 0 on failure.
233 int tls13_generate_handshake_secret(SSL_CONNECTION
*s
,
234 const unsigned char *insecret
,
237 /* Calls SSLfatal() if required */
238 return tls13_generate_secret(s
, ssl_handshake_md(s
), s
->early_secret
,
239 insecret
, insecretlen
,
240 (unsigned char *)&s
->handshake_secret
);
244 * Given the handshake secret |prev| of length |prevlen| generate the master
245 * secret and store its length in |*secret_size|. Returns 1 on success 0 on
248 int tls13_generate_master_secret(SSL_CONNECTION
*s
, unsigned char *out
,
249 unsigned char *prev
, size_t prevlen
,
252 const EVP_MD
*md
= ssl_handshake_md(s
);
254 *secret_size
= EVP_MD_get_size(md
);
255 /* Calls SSLfatal() if required */
256 return tls13_generate_secret(s
, md
, prev
, NULL
, 0, out
);
260 * Generates the mac for the Finished message. Returns the length of the MAC or
263 size_t tls13_final_finish_mac(SSL_CONNECTION
*s
, const char *str
, size_t slen
,
266 const EVP_MD
*md
= ssl_handshake_md(s
);
267 const char *mdname
= EVP_MD_get0_name(md
);
268 unsigned char hash
[EVP_MAX_MD_SIZE
];
269 unsigned char finsecret
[EVP_MAX_MD_SIZE
];
270 unsigned char *key
= NULL
;
271 size_t len
= 0, hashlen
;
272 OSSL_PARAM params
[2], *p
= params
;
273 SSL_CTX
*sctx
= SSL_CONNECTION_GET_CTX(s
);
278 /* Safe to cast away const here since we're not "getting" any data */
279 if (sctx
->propq
!= NULL
)
280 *p
++ = OSSL_PARAM_construct_utf8_string(OSSL_ALG_PARAM_PROPERTIES
,
283 *p
= OSSL_PARAM_construct_end();
285 if (!ssl_handshake_hash(s
, hash
, sizeof(hash
), &hashlen
)) {
286 /* SSLfatal() already called */
290 if (str
== SSL_CONNECTION_GET_SSL(s
)->method
->ssl3_enc
->server_finished_label
) {
291 key
= s
->server_finished_secret
;
292 } else if (SSL_IS_FIRST_HANDSHAKE(s
)) {
293 key
= s
->client_finished_secret
;
295 if (!tls13_derive_finishedkey(s
, md
,
296 s
->client_app_traffic_secret
,
302 if (!EVP_Q_mac(sctx
->libctx
, "HMAC", sctx
->propq
, mdname
,
303 params
, key
, hashlen
, hash
, hashlen
,
304 /* outsize as per sizeof(peer_finish_md) */
305 out
, EVP_MAX_MD_SIZE
* 2, &len
)) {
306 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, ERR_R_INTERNAL_ERROR
);
311 OPENSSL_cleanse(finsecret
, sizeof(finsecret
));
316 * There isn't really a key block in TLSv1.3, but we still need this function
317 * for initialising the cipher and hash. Returns 1 on success or 0 on failure.
319 int tls13_setup_key_block(SSL_CONNECTION
*s
)
324 s
->session
->cipher
= s
->s3
.tmp
.new_cipher
;
325 if (!ssl_cipher_get_evp(SSL_CONNECTION_GET_CTX(s
), s
->session
, &c
, &hash
,
326 NULL
, NULL
, NULL
, 0)) {
327 /* Error is already recorded */
328 SSLfatal_alert(s
, SSL_AD_INTERNAL_ERROR
);
332 ssl_evp_cipher_free(s
->s3
.tmp
.new_sym_enc
);
333 s
->s3
.tmp
.new_sym_enc
= c
;
334 ssl_evp_md_free(s
->s3
.tmp
.new_hash
);
335 s
->s3
.tmp
.new_hash
= hash
;
340 static int derive_secret_key_and_iv(SSL_CONNECTION
*s
, int sending
,
342 const EVP_CIPHER
*ciph
,
343 const unsigned char *insecret
,
344 const unsigned char *hash
,
345 const unsigned char *label
,
346 size_t labellen
, unsigned char *secret
,
347 unsigned char *key
, size_t *keylen
,
348 unsigned char *iv
, size_t *ivlen
,
350 EVP_CIPHER_CTX
*ciph_ctx
)
352 int hashleni
= EVP_MD_get_size(md
);
356 /* Ensure cast to size_t is safe */
357 if (!ossl_assert(hashleni
>= 0)) {
358 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, ERR_R_EVP_LIB
);
361 hashlen
= (size_t)hashleni
;
363 if (!tls13_hkdf_expand(s
, md
, insecret
, label
, labellen
, hash
, hashlen
,
364 secret
, hashlen
, 1)) {
365 /* SSLfatal() already called */
369 *keylen
= EVP_CIPHER_get_key_length(ciph
);
371 mode
= EVP_CIPHER_get_mode(ciph
);
372 if (mode
== EVP_CIPH_CCM_MODE
) {
375 *ivlen
= EVP_CCM_TLS_IV_LEN
;
376 if (s
->s3
.tmp
.new_cipher
!= NULL
) {
377 algenc
= s
->s3
.tmp
.new_cipher
->algorithm_enc
;
378 } else if (s
->session
->cipher
!= NULL
) {
379 /* We've not selected a cipher yet - we must be doing early data */
380 algenc
= s
->session
->cipher
->algorithm_enc
;
381 } else if (s
->psksession
!= NULL
&& s
->psksession
->cipher
!= NULL
) {
382 /* We must be doing early data with out-of-band PSK */
383 algenc
= s
->psksession
->cipher
->algorithm_enc
;
385 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, ERR_R_EVP_LIB
);
388 if (algenc
& (SSL_AES128CCM8
| SSL_AES256CCM8
))
389 *taglen
= EVP_CCM8_TLS_TAG_LEN
;
391 *taglen
= EVP_CCM_TLS_TAG_LEN
;
393 if (mode
== EVP_CIPH_GCM_MODE
) {
394 *taglen
= EVP_GCM_TLS_TAG_LEN
;
396 /* CHACHA20P-POLY1305 */
397 *taglen
= EVP_CHACHAPOLY_TLS_TAG_LEN
;
399 *ivlen
= EVP_CIPHER_get_iv_length(ciph
);
402 if (!tls13_derive_key(s
, md
, secret
, key
, *keylen
)
403 || !tls13_derive_iv(s
, md
, secret
, iv
, *ivlen
)) {
404 /* SSLfatal() already called */
409 if (EVP_CipherInit_ex(ciph_ctx
, ciph
, NULL
, NULL
, NULL
, sending
) <= 0
410 || EVP_CIPHER_CTX_ctrl(ciph_ctx
, EVP_CTRL_AEAD_SET_IVLEN
, *ivlen
, NULL
) <= 0
411 || (mode
== EVP_CIPH_CCM_MODE
412 && EVP_CIPHER_CTX_ctrl(ciph_ctx
, EVP_CTRL_AEAD_SET_TAG
, *taglen
, NULL
) <= 0)
413 || EVP_CipherInit_ex(ciph_ctx
, NULL
, NULL
, key
, NULL
, -1) <= 0) {
414 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, ERR_R_EVP_LIB
);
422 int tls13_change_cipher_state(SSL_CONNECTION
*s
, int which
)
424 #ifdef CHARSET_EBCDIC
425 static const unsigned char client_early_traffic
[] = {0x63, 0x20, 0x65, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
426 static const unsigned char client_handshake_traffic
[] = {0x63, 0x20, 0x68, 0x73, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
427 static const unsigned char client_application_traffic
[] = {0x63, 0x20, 0x61, 0x70, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
428 static const unsigned char server_handshake_traffic
[] = {0x73, 0x20, 0x68, 0x73, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
429 static const unsigned char server_application_traffic
[] = {0x73, 0x20, 0x61, 0x70, 0x20, /*traffic*/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
430 static const unsigned char exporter_master_secret
[] = {0x65, 0x78, 0x70, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00};
431 static const unsigned char resumption_master_secret
[] = {0x72, 0x65, 0x73, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00};
432 static const unsigned char early_exporter_master_secret
[] = {0x65, 0x20, 0x65, 0x78, 0x70, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00};
434 static const unsigned char client_early_traffic
[] = "c e traffic";
435 static const unsigned char client_handshake_traffic
[] = "c hs traffic";
436 static const unsigned char client_application_traffic
[] = "c ap traffic";
437 static const unsigned char server_handshake_traffic
[] = "s hs traffic";
438 static const unsigned char server_application_traffic
[] = "s ap traffic";
439 static const unsigned char exporter_master_secret
[] = "exp master";
440 static const unsigned char resumption_master_secret
[] = "res master";
441 static const unsigned char early_exporter_master_secret
[] = "e exp master";
444 unsigned char key
[EVP_MAX_KEY_LENGTH
];
445 unsigned char secret
[EVP_MAX_MD_SIZE
];
446 unsigned char hashval
[EVP_MAX_MD_SIZE
];
447 unsigned char *hash
= hashval
;
448 unsigned char *insecret
;
449 unsigned char *finsecret
= NULL
;
450 const char *log_label
= NULL
;
451 EVP_CIPHER_CTX
*ciph_ctx
= NULL
;
452 size_t finsecretlen
= 0;
453 const unsigned char *label
;
454 size_t labellen
, hashlen
= 0;
456 const EVP_MD
*md
= NULL
;
457 const EVP_CIPHER
*cipher
= NULL
;
458 SSL_CTX
*sctx
= SSL_CONNECTION_GET_CTX(s
);
459 size_t keylen
, ivlen
, taglen
;
460 #if !defined(OPENSSL_NO_KTLS) && defined(OPENSSL_KTLS_TLS13)
461 ktls_crypto_info_t crypto_info
;
466 if (which
& SSL3_CC_READ
) {
469 RECORD_LAYER_reset_read_sequence(&s
->rlayer
);
471 s
->statem
.enc_write_state
= ENC_WRITE_STATE_INVALID
;
472 if (s
->enc_write_ctx
!= NULL
) {
473 EVP_CIPHER_CTX_reset(s
->enc_write_ctx
);
475 s
->enc_write_ctx
= EVP_CIPHER_CTX_new();
476 if (s
->enc_write_ctx
== NULL
) {
477 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, ERR_R_MALLOC_FAILURE
);
481 ciph_ctx
= s
->enc_write_ctx
;
484 RECORD_LAYER_reset_write_sequence(&s
->rlayer
);
487 if (((which
& SSL3_CC_CLIENT
) && (which
& SSL3_CC_WRITE
))
488 || ((which
& SSL3_CC_SERVER
) && (which
& SSL3_CC_READ
))) {
489 if (which
& SSL3_CC_EARLY
) {
490 EVP_MD_CTX
*mdctx
= NULL
;
493 unsigned int hashlenui
;
494 const SSL_CIPHER
*sslcipher
= SSL_SESSION_get0_cipher(s
->session
);
496 insecret
= s
->early_secret
;
497 label
= client_early_traffic
;
498 labellen
= sizeof(client_early_traffic
) - 1;
499 log_label
= CLIENT_EARLY_LABEL
;
501 handlen
= BIO_get_mem_data(s
->s3
.handshake_buffer
, &hdata
);
503 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_R_BAD_HANDSHAKE_LENGTH
);
507 if (s
->early_data_state
== SSL_EARLY_DATA_CONNECTING
508 && s
->max_early_data
> 0
509 && s
->session
->ext
.max_early_data
== 0) {
511 * If we are attempting to send early data, and we've decided to
512 * actually do it but max_early_data in s->session is 0 then we
513 * must be using an external PSK.
515 if (!ossl_assert(s
->psksession
!= NULL
516 && s
->max_early_data
==
517 s
->psksession
->ext
.max_early_data
)) {
518 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, ERR_R_INTERNAL_ERROR
);
521 sslcipher
= SSL_SESSION_get0_cipher(s
->psksession
);
523 if (sslcipher
== NULL
) {
524 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, SSL_R_BAD_PSK
);
529 * We need to calculate the handshake digest using the digest from
530 * the session. We haven't yet selected our ciphersuite so we can't
531 * use ssl_handshake_md().
533 mdctx
= EVP_MD_CTX_new();
535 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, ERR_R_MALLOC_FAILURE
);
540 * This ups the ref count on cipher so we better make sure we free
543 if (!ssl_cipher_get_evp_cipher(sctx
, sslcipher
, &cipher
)) {
544 /* Error is already recorded */
545 SSLfatal_alert(s
, SSL_AD_INTERNAL_ERROR
);
546 EVP_MD_CTX_free(mdctx
);
550 md
= ssl_md(sctx
, sslcipher
->algorithm2
);
551 if (md
== NULL
|| !EVP_DigestInit_ex(mdctx
, md
, NULL
)
552 || !EVP_DigestUpdate(mdctx
, hdata
, handlen
)
553 || !EVP_DigestFinal_ex(mdctx
, hashval
, &hashlenui
)) {
554 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, ERR_R_INTERNAL_ERROR
);
555 EVP_MD_CTX_free(mdctx
);
559 EVP_MD_CTX_free(mdctx
);
561 if (!tls13_hkdf_expand(s
, md
, insecret
,
562 early_exporter_master_secret
,
563 sizeof(early_exporter_master_secret
) - 1,
565 s
->early_exporter_master_secret
, hashlen
,
567 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, ERR_R_INTERNAL_ERROR
);
571 if (!ssl_log_secret(s
, EARLY_EXPORTER_SECRET_LABEL
,
572 s
->early_exporter_master_secret
, hashlen
)) {
573 /* SSLfatal() already called */
576 } else if (which
& SSL3_CC_HANDSHAKE
) {
577 insecret
= s
->handshake_secret
;
578 finsecret
= s
->client_finished_secret
;
579 finsecretlen
= EVP_MD_get_size(ssl_handshake_md(s
));
580 label
= client_handshake_traffic
;
581 labellen
= sizeof(client_handshake_traffic
) - 1;
582 log_label
= CLIENT_HANDSHAKE_LABEL
;
584 * The handshake hash used for the server read/client write handshake
585 * traffic secret is the same as the hash for the server
586 * write/client read handshake traffic secret. However, if we
587 * processed early data then we delay changing the server
588 * read/client write cipher state until later, and the handshake
589 * hashes have moved on. Therefore we use the value saved earlier
590 * when we did the server write/client read change cipher state.
592 hash
= s
->handshake_traffic_hash
;
594 insecret
= s
->master_secret
;
595 label
= client_application_traffic
;
596 labellen
= sizeof(client_application_traffic
) - 1;
597 log_label
= CLIENT_APPLICATION_LABEL
;
599 * For this we only use the handshake hashes up until the server
600 * Finished hash. We do not include the client's Finished, which is
601 * what ssl_handshake_hash() would give us. Instead we use the
602 * previously saved value.
604 hash
= s
->server_finished_hash
;
607 /* Early data never applies to client-read/server-write */
608 if (which
& SSL3_CC_HANDSHAKE
) {
609 insecret
= s
->handshake_secret
;
610 finsecret
= s
->server_finished_secret
;
611 finsecretlen
= EVP_MD_get_size(ssl_handshake_md(s
));
612 label
= server_handshake_traffic
;
613 labellen
= sizeof(server_handshake_traffic
) - 1;
614 log_label
= SERVER_HANDSHAKE_LABEL
;
616 insecret
= s
->master_secret
;
617 label
= server_application_traffic
;
618 labellen
= sizeof(server_application_traffic
) - 1;
619 log_label
= SERVER_APPLICATION_LABEL
;
623 if (!(which
& SSL3_CC_EARLY
)) {
624 md
= ssl_handshake_md(s
);
625 cipher
= s
->s3
.tmp
.new_sym_enc
;
626 if (!ssl3_digest_cached_records(s
, 1)
627 || !ssl_handshake_hash(s
, hashval
, sizeof(hashval
), &hashlen
)) {
628 /* SSLfatal() already called */;
634 * Save the hash of handshakes up to now for use when we calculate the
635 * client application traffic secret
637 if (label
== server_application_traffic
)
638 memcpy(s
->server_finished_hash
, hashval
, hashlen
);
640 if (label
== server_handshake_traffic
)
641 memcpy(s
->handshake_traffic_hash
, hashval
, hashlen
);
643 if (label
== client_application_traffic
) {
645 * We also create the resumption master secret, but this time use the
646 * hash for the whole handshake including the Client Finished
648 if (!tls13_hkdf_expand(s
, ssl_handshake_md(s
), insecret
,
649 resumption_master_secret
,
650 sizeof(resumption_master_secret
) - 1,
651 hashval
, hashlen
, s
->resumption_master_secret
,
653 /* SSLfatal() already called */
658 /* check whether cipher is known */
659 if (!ossl_assert(cipher
!= NULL
))
662 if (!derive_secret_key_and_iv(s
, which
& SSL3_CC_WRITE
, md
, cipher
,
663 insecret
, hash
, label
, labellen
, secret
, key
,
664 &keylen
, iv
, &ivlen
, &taglen
, ciph_ctx
)) {
665 /* SSLfatal() already called */
669 if (label
== server_application_traffic
) {
670 memcpy(s
->server_app_traffic_secret
, secret
, hashlen
);
671 /* Now we create the exporter master secret */
672 if (!tls13_hkdf_expand(s
, ssl_handshake_md(s
), insecret
,
673 exporter_master_secret
,
674 sizeof(exporter_master_secret
) - 1,
675 hash
, hashlen
, s
->exporter_master_secret
,
677 /* SSLfatal() already called */
681 if (!ssl_log_secret(s
, EXPORTER_SECRET_LABEL
, s
->exporter_master_secret
,
683 /* SSLfatal() already called */
686 } else if (label
== client_application_traffic
)
687 memcpy(s
->client_app_traffic_secret
, secret
, hashlen
);
689 if (!ssl_log_secret(s
, log_label
, secret
, hashlen
)) {
690 /* SSLfatal() already called */
694 if (finsecret
!= NULL
695 && !tls13_derive_finishedkey(s
, ssl_handshake_md(s
), secret
,
696 finsecret
, finsecretlen
)) {
697 /* SSLfatal() already called */
701 if (!s
->server
&& label
== client_early_traffic
)
702 s
->statem
.enc_write_state
= ENC_WRITE_STATE_WRITE_PLAIN_ALERTS
;
704 s
->statem
.enc_write_state
= ENC_WRITE_STATE_VALID
;
706 if ((which
& SSL3_CC_READ
) != 0) {
707 int level
= (which
& SSL3_CC_EARLY
) != 0
708 ? OSSL_RECORD_PROTECTION_LEVEL_EARLY
709 : ((which
&SSL3_CC_HANDSHAKE
) != 0
710 ? OSSL_RECORD_PROTECTION_LEVEL_HANDSHAKE
711 : OSSL_RECORD_PROTECTION_LEVEL_APPLICATION
);
713 if (!ssl_set_new_record_layer(s
, NULL
, s
->version
,
714 OSSL_RECORD_DIRECTION_READ
,
715 level
, key
, keylen
, iv
, ivlen
, NULL
, 0,
716 cipher
, taglen
, NID_undef
, NULL
, NULL
)) {
717 /* SSLfatal already called */
722 #ifndef OPENSSL_NO_KTLS
723 # if defined(OPENSSL_KTLS_TLS13)
724 if (!(which
& SSL3_CC_APPLICATION
)
725 || (s
->options
& SSL_OP_ENABLE_KTLS
) == 0)
728 /* ktls supports only the maximum fragment size */
729 if (ssl_get_max_send_fragment(s
) != SSL3_RT_MAX_PLAIN_LENGTH
)
732 /* ktls does not support record padding */
733 if (s
->record_padding_cb
!= NULL
)
736 /* check that cipher is supported */
737 if (!ktls_check_supported_cipher(s
, cipher
, ciph_ctx
))
740 if (which
& SSL3_CC_WRITE
)
745 if (!ossl_assert(bio
!= NULL
)) {
746 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
, ERR_R_INTERNAL_ERROR
);
750 /* All future data will get encrypted by ktls. Flush the BIO or skip ktls */
751 if (which
& SSL3_CC_WRITE
) {
752 if (BIO_flush(bio
) <= 0)
756 /* configure kernel crypto structure */
757 if (which
& SSL3_CC_WRITE
)
758 rl_sequence
= RECORD_LAYER_get_write_sequence(&s
->rlayer
);
760 rl_sequence
= RECORD_LAYER_get_read_sequence(&s
->rlayer
);
762 if (!ktls_configure_crypto(s
, cipher
, ciph_ctx
, rl_sequence
, &crypto_info
,
763 which
& SSL3_CC_WRITE
, iv
, key
, NULL
, 0))
766 /* ktls works with user provided buffers directly */
767 if (BIO_set_ktls(bio
, &crypto_info
, which
& SSL3_CC_WRITE
)) {
768 if (which
& SSL3_CC_WRITE
)
769 ssl3_release_write_buffer(s
);
776 if ((which
& SSL3_CC_EARLY
) != 0) {
777 /* We up-refed this so now we need to down ref */
778 ssl_evp_cipher_free(cipher
);
780 OPENSSL_cleanse(key
, sizeof(key
));
781 OPENSSL_cleanse(secret
, sizeof(secret
));
785 int tls13_update_key(SSL_CONNECTION
*s
, int sending
)
787 #ifdef CHARSET_EBCDIC
788 static const unsigned char application_traffic
[] = { 0x74, 0x72 ,0x61 ,0x66 ,0x66 ,0x69 ,0x63 ,0x20 ,0x75 ,0x70 ,0x64, 0x00};
790 static const unsigned char application_traffic
[] = "traffic upd";
792 const EVP_MD
*md
= ssl_handshake_md(s
);
793 size_t hashlen
= EVP_MD_get_size(md
);
794 unsigned char key
[EVP_MAX_KEY_LENGTH
];
795 unsigned char *insecret
, *iv
;
796 unsigned char secret
[EVP_MAX_MD_SIZE
];
797 EVP_CIPHER_CTX
*ciph_ctx
;
798 size_t keylen
, ivlen
, taglen
;
801 if (s
->server
== sending
)
802 insecret
= s
->server_app_traffic_secret
;
804 insecret
= s
->client_app_traffic_secret
;
807 s
->statem
.enc_write_state
= ENC_WRITE_STATE_INVALID
;
809 ciph_ctx
= s
->enc_write_ctx
;
810 RECORD_LAYER_reset_write_sequence(&s
->rlayer
);
813 ciph_ctx
= s
->enc_read_ctx
;
814 RECORD_LAYER_reset_read_sequence(&s
->rlayer
);
817 if (!derive_secret_key_and_iv(s
, sending
, md
,
818 s
->s3
.tmp
.new_sym_enc
, insecret
, NULL
,
820 sizeof(application_traffic
) - 1, secret
, key
,
821 &keylen
, iv
, &ivlen
, &taglen
, ciph_ctx
)) {
822 /* SSLfatal() already called */
826 memcpy(insecret
, secret
, hashlen
);
829 if (!ssl_set_new_record_layer(s
, NULL
, s
->version
,
830 OSSL_RECORD_DIRECTION_READ
,
831 OSSL_RECORD_PROTECTION_LEVEL_APPLICATION
,
832 key
, keylen
, iv
, ivlen
, NULL
, 0,
833 s
->s3
.tmp
.new_sym_enc
, taglen
, NID_undef
, NULL
,
835 /* SSLfatal already called */
840 s
->statem
.enc_write_state
= ENC_WRITE_STATE_VALID
;
843 OPENSSL_cleanse(key
, sizeof(key
));
844 OPENSSL_cleanse(secret
, sizeof(secret
));
848 int tls13_alert_code(int code
)
850 /* There are 2 additional alerts in TLSv1.3 compared to TLSv1.2 */
851 if (code
== SSL_AD_MISSING_EXTENSION
|| code
== SSL_AD_CERTIFICATE_REQUIRED
)
854 return tls1_alert_code(code
);
857 int tls13_export_keying_material(SSL_CONNECTION
*s
,
858 unsigned char *out
, size_t olen
,
859 const char *label
, size_t llen
,
860 const unsigned char *context
,
861 size_t contextlen
, int use_context
)
863 unsigned char exportsecret
[EVP_MAX_MD_SIZE
];
864 #ifdef CHARSET_EBCDIC
865 static const unsigned char exporterlabel
[] = {0x65, 0x78, 0x70, 0x6F, 0x72, 0x74, 0x65, 0x72, 0x00};
867 static const unsigned char exporterlabel
[] = "exporter";
869 unsigned char hash
[EVP_MAX_MD_SIZE
], data
[EVP_MAX_MD_SIZE
];
870 const EVP_MD
*md
= ssl_handshake_md(s
);
871 EVP_MD_CTX
*ctx
= EVP_MD_CTX_new();
872 unsigned int hashsize
, datalen
;
875 if (ctx
== NULL
|| md
== NULL
|| !ossl_statem_export_allowed(s
))
881 if (EVP_DigestInit_ex(ctx
, md
, NULL
) <= 0
882 || EVP_DigestUpdate(ctx
, context
, contextlen
) <= 0
883 || EVP_DigestFinal_ex(ctx
, hash
, &hashsize
) <= 0
884 || EVP_DigestInit_ex(ctx
, md
, NULL
) <= 0
885 || EVP_DigestFinal_ex(ctx
, data
, &datalen
) <= 0
886 || !tls13_hkdf_expand(s
, md
, s
->exporter_master_secret
,
887 (const unsigned char *)label
, llen
,
888 data
, datalen
, exportsecret
, hashsize
, 0)
889 || !tls13_hkdf_expand(s
, md
, exportsecret
, exporterlabel
,
890 sizeof(exporterlabel
) - 1, hash
, hashsize
,
896 EVP_MD_CTX_free(ctx
);
900 int tls13_export_keying_material_early(SSL_CONNECTION
*s
,
901 unsigned char *out
, size_t olen
,
902 const char *label
, size_t llen
,
903 const unsigned char *context
,
906 #ifdef CHARSET_EBCDIC
907 static const unsigned char exporterlabel
[] = {0x65, 0x78, 0x70, 0x6F, 0x72, 0x74, 0x65, 0x72, 0x00};
909 static const unsigned char exporterlabel
[] = "exporter";
911 unsigned char exportsecret
[EVP_MAX_MD_SIZE
];
912 unsigned char hash
[EVP_MAX_MD_SIZE
], data
[EVP_MAX_MD_SIZE
];
914 EVP_MD_CTX
*ctx
= EVP_MD_CTX_new();
915 unsigned int hashsize
, datalen
;
917 const SSL_CIPHER
*sslcipher
;
919 if (ctx
== NULL
|| !ossl_statem_export_early_allowed(s
))
922 if (!s
->server
&& s
->max_early_data
> 0
923 && s
->session
->ext
.max_early_data
== 0)
924 sslcipher
= SSL_SESSION_get0_cipher(s
->psksession
);
926 sslcipher
= SSL_SESSION_get0_cipher(s
->session
);
928 md
= ssl_md(SSL_CONNECTION_GET_CTX(s
), sslcipher
->algorithm2
);
931 * Calculate the hash value and store it in |data|. The reason why
932 * the empty string is used is that the definition of TLS-Exporter
935 * TLS-Exporter(label, context_value, key_length) =
936 * HKDF-Expand-Label(Derive-Secret(Secret, label, ""),
937 * "exporter", Hash(context_value), key_length)
939 * Derive-Secret(Secret, Label, Messages) =
940 * HKDF-Expand-Label(Secret, Label,
941 * Transcript-Hash(Messages), Hash.length)
943 * Here Transcript-Hash is the cipher suite hash algorithm.
946 || EVP_DigestInit_ex(ctx
, md
, NULL
) <= 0
947 || EVP_DigestUpdate(ctx
, context
, contextlen
) <= 0
948 || EVP_DigestFinal_ex(ctx
, hash
, &hashsize
) <= 0
949 || EVP_DigestInit_ex(ctx
, md
, NULL
) <= 0
950 || EVP_DigestFinal_ex(ctx
, data
, &datalen
) <= 0
951 || !tls13_hkdf_expand(s
, md
, s
->early_exporter_master_secret
,
952 (const unsigned char *)label
, llen
,
953 data
, datalen
, exportsecret
, hashsize
, 0)
954 || !tls13_hkdf_expand(s
, md
, exportsecret
, exporterlabel
,
955 sizeof(exporterlabel
) - 1, hash
, hashsize
,
961 EVP_MD_CTX_free(ctx
);