IABSD.fr/src/lib/libssl/tls12_lib.c

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• Author : tb
  Date : 2022-11-26 16:08:50
  Hash : c9675a23
  Message : Make internal header file names consistent Libcrypto currently has a mess of *_lcl.h, *_locl.h, and *_local.h names used for internal headers. Move all these headers we inherited from OpenSSL to *_local.h, reserving the name *_internal.h for our own code. Similarly, move dtls_locl.h and ssl_locl.h to dtls_local and ssl_local.h. constant_time_locl.h is moved to constant_time.h since it's special. Adjust all .c files in libcrypto, libssl and regress. The diff is mechanical with the exception of tls13_quic.c, where #include <ssl_locl.h> was fixed manually. discussed with jsing, no objection bcook

• lib/libssl/tls12_lib.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;
  }