118 lines
3.5 KiB
C
Executable file
118 lines
3.5 KiB
C
Executable file
/* $OpenBSD: tls12_lib.c,v 1.4 2022/02/05 14:54:10 jsing Exp $ */
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/*
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* Copyright (c) 2021 Joel Sing <jsing@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "ssl_locl.h"
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static int
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tls12_finished_verify_data(SSL *s, const char *finished_label,
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size_t finished_label_len, uint8_t *verify_data, size_t verify_data_len,
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size_t *out_len)
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{
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uint8_t transcript_hash[EVP_MAX_MD_SIZE];
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size_t transcript_hash_len;
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*out_len = 0;
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if (s->session->master_key_length <= 0)
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return 0;
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if (verify_data_len < TLS1_FINISH_MAC_LENGTH)
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return 0;
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if (!tls1_transcript_hash_value(s, transcript_hash,
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sizeof(transcript_hash), &transcript_hash_len))
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return 0;
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if (!tls1_PRF(s, s->session->master_key, s->session->master_key_length,
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finished_label, finished_label_len, transcript_hash,
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transcript_hash_len, NULL, 0, NULL, 0, NULL, 0, verify_data,
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TLS1_FINISH_MAC_LENGTH))
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return 0;
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*out_len = TLS1_FINISH_MAC_LENGTH;
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return 1;
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}
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static int
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tls12_client_finished_verify_data(SSL *s, uint8_t *verify_data,
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size_t verify_data_len, size_t *out_len)
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{
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return tls12_finished_verify_data(s, TLS_MD_CLIENT_FINISH_CONST,
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TLS_MD_CLIENT_FINISH_CONST_SIZE, verify_data, verify_data_len,
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out_len);
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}
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static int
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tls12_server_finished_verify_data(SSL *s, uint8_t *verify_data,
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size_t verify_data_len, size_t *out_len)
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{
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return tls12_finished_verify_data(s, TLS_MD_SERVER_FINISH_CONST,
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TLS_MD_SERVER_FINISH_CONST_SIZE, verify_data, verify_data_len,
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out_len);
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}
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int
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tls12_derive_finished(SSL *s)
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{
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if (!s->server) {
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return tls12_client_finished_verify_data(s,
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s->s3->hs.finished, sizeof(s->s3->hs.finished),
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&s->s3->hs.finished_len);
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} else {
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return tls12_server_finished_verify_data(s,
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s->s3->hs.finished, sizeof(s->s3->hs.finished),
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&s->s3->hs.finished_len);
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}
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}
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int
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tls12_derive_peer_finished(SSL *s)
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{
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if (s->server) {
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return tls12_client_finished_verify_data(s,
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s->s3->hs.peer_finished, sizeof(s->s3->hs.peer_finished),
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&s->s3->hs.peer_finished_len);
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} else {
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return tls12_server_finished_verify_data(s,
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s->s3->hs.peer_finished, sizeof(s->s3->hs.peer_finished),
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&s->s3->hs.peer_finished_len);
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}
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}
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int
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tls12_derive_master_secret(SSL *s, uint8_t *premaster_secret,
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size_t premaster_secret_len)
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{
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s->session->master_key_length = 0;
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if (premaster_secret_len == 0)
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return 0;
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CTASSERT(sizeof(s->session->master_key) == SSL_MAX_MASTER_KEY_LENGTH);
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if (!tls1_PRF(s, premaster_secret, premaster_secret_len,
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TLS_MD_MASTER_SECRET_CONST, TLS_MD_MASTER_SECRET_CONST_SIZE,
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s->s3->client_random, SSL3_RANDOM_SIZE, NULL, 0,
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s->s3->server_random, SSL3_RANDOM_SIZE, NULL, 0,
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s->session->master_key, sizeof(s->session->master_key)))
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return 0;
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s->session->master_key_length = SSL_MAX_MASTER_KEY_LENGTH;
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return 1;
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}
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