119 lines
3.5 KiB
C
119 lines
3.5 KiB
C
/* $OpenBSD: tls12_lib.c,v 1.6 2022/11/26 16:08:56 tb Exp $ */
|
|
/*
|
|
* Copyright (c) 2021 Joel Sing <jsing@openbsd.org>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#include "ssl_local.h"
|
|
|
|
static int
|
|
tls12_finished_verify_data(SSL *s, const char *finished_label,
|
|
size_t finished_label_len, uint8_t *verify_data, size_t verify_data_len,
|
|
size_t *out_len)
|
|
{
|
|
uint8_t transcript_hash[EVP_MAX_MD_SIZE];
|
|
size_t transcript_hash_len;
|
|
|
|
*out_len = 0;
|
|
|
|
if (s->session->master_key_length == 0)
|
|
return 0;
|
|
|
|
if (verify_data_len < TLS1_FINISH_MAC_LENGTH)
|
|
return 0;
|
|
|
|
if (!tls1_transcript_hash_value(s, transcript_hash,
|
|
sizeof(transcript_hash), &transcript_hash_len))
|
|
return 0;
|
|
|
|
if (!tls1_PRF(s, s->session->master_key, s->session->master_key_length,
|
|
finished_label, finished_label_len, transcript_hash,
|
|
transcript_hash_len, NULL, 0, NULL, 0, NULL, 0, verify_data,
|
|
TLS1_FINISH_MAC_LENGTH))
|
|
return 0;
|
|
|
|
*out_len = TLS1_FINISH_MAC_LENGTH;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
tls12_client_finished_verify_data(SSL *s, uint8_t *verify_data,
|
|
size_t verify_data_len, size_t *out_len)
|
|
{
|
|
return tls12_finished_verify_data(s, TLS_MD_CLIENT_FINISH_CONST,
|
|
TLS_MD_CLIENT_FINISH_CONST_SIZE, verify_data, verify_data_len,
|
|
out_len);
|
|
}
|
|
|
|
static int
|
|
tls12_server_finished_verify_data(SSL *s, uint8_t *verify_data,
|
|
size_t verify_data_len, size_t *out_len)
|
|
{
|
|
return tls12_finished_verify_data(s, TLS_MD_SERVER_FINISH_CONST,
|
|
TLS_MD_SERVER_FINISH_CONST_SIZE, verify_data, verify_data_len,
|
|
out_len);
|
|
}
|
|
|
|
int
|
|
tls12_derive_finished(SSL *s)
|
|
{
|
|
if (!s->server) {
|
|
return tls12_client_finished_verify_data(s,
|
|
s->s3->hs.finished, sizeof(s->s3->hs.finished),
|
|
&s->s3->hs.finished_len);
|
|
} else {
|
|
return tls12_server_finished_verify_data(s,
|
|
s->s3->hs.finished, sizeof(s->s3->hs.finished),
|
|
&s->s3->hs.finished_len);
|
|
}
|
|
}
|
|
|
|
int
|
|
tls12_derive_peer_finished(SSL *s)
|
|
{
|
|
if (s->server) {
|
|
return tls12_client_finished_verify_data(s,
|
|
s->s3->hs.peer_finished, sizeof(s->s3->hs.peer_finished),
|
|
&s->s3->hs.peer_finished_len);
|
|
} else {
|
|
return tls12_server_finished_verify_data(s,
|
|
s->s3->hs.peer_finished, sizeof(s->s3->hs.peer_finished),
|
|
&s->s3->hs.peer_finished_len);
|
|
}
|
|
}
|
|
|
|
int
|
|
tls12_derive_master_secret(SSL *s, uint8_t *premaster_secret,
|
|
size_t premaster_secret_len)
|
|
{
|
|
s->session->master_key_length = 0;
|
|
|
|
if (premaster_secret_len == 0)
|
|
return 0;
|
|
|
|
CTASSERT(sizeof(s->session->master_key) == SSL_MAX_MASTER_KEY_LENGTH);
|
|
|
|
if (!tls1_PRF(s, premaster_secret, premaster_secret_len,
|
|
TLS_MD_MASTER_SECRET_CONST, TLS_MD_MASTER_SECRET_CONST_SIZE,
|
|
s->s3->client_random, SSL3_RANDOM_SIZE, NULL, 0,
|
|
s->s3->server_random, SSL3_RANDOM_SIZE, NULL, 0,
|
|
s->session->master_key, sizeof(s->session->master_key)))
|
|
return 0;
|
|
|
|
s->session->master_key_length = SSL_MAX_MASTER_KEY_LENGTH;
|
|
|
|
return 1;
|
|
}
|