pineapple-src/externals/libressl/ssl/ssl_transcript.c

208 lines
4.4 KiB
C
Raw Normal View History

2020-12-28 15:15:37 +00:00
/* $OpenBSD: ssl_transcript.c,v 1.2 2020/02/05 16:47:34 jsing Exp $ */
/*
* Copyright (c) 2017 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_locl.h"
#include <openssl/ssl.h>
int
tls1_transcript_hash_init(SSL *s)
{
const unsigned char *data;
const EVP_MD *md;
size_t len;
tls1_transcript_hash_free(s);
if (!ssl_get_handshake_evp_md(s, &md)) {
SSLerrorx(ERR_R_INTERNAL_ERROR);
goto err;
}
if ((S3I(s)->handshake_hash = EVP_MD_CTX_new()) == NULL) {
SSLerror(s, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!EVP_DigestInit_ex(S3I(s)->handshake_hash, md, NULL)) {
SSLerror(s, ERR_R_EVP_LIB);
goto err;
}
if (!tls1_transcript_data(s, &data, &len)) {
SSLerror(s, SSL_R_BAD_HANDSHAKE_LENGTH);
goto err;
}
if (!tls1_transcript_hash_update(s, data, len)) {
SSLerror(s, ERR_R_EVP_LIB);
goto err;
}
return 1;
err:
tls1_transcript_hash_free(s);
return 0;
}
int
tls1_transcript_hash_update(SSL *s, const unsigned char *buf, size_t len)
{
if (S3I(s)->handshake_hash == NULL)
return 1;
return EVP_DigestUpdate(S3I(s)->handshake_hash, buf, len);
}
int
tls1_transcript_hash_value(SSL *s, const unsigned char *out, size_t len,
size_t *outlen)
{
EVP_MD_CTX *mdctx = NULL;
unsigned int mdlen;
int ret = 0;
if (EVP_MD_CTX_size(S3I(s)->handshake_hash) > len)
goto err;
if ((mdctx = EVP_MD_CTX_new()) == NULL) {
SSLerror(s, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!EVP_MD_CTX_copy_ex(mdctx, S3I(s)->handshake_hash)) {
SSLerror(s, ERR_R_EVP_LIB);
goto err;
}
if (!EVP_DigestFinal_ex(mdctx, (unsigned char *)out, &mdlen)) {
SSLerror(s, ERR_R_EVP_LIB);
goto err;
}
if (outlen != NULL)
*outlen = mdlen;
ret = 1;
err:
EVP_MD_CTX_free(mdctx);
return (ret);
}
void
tls1_transcript_hash_free(SSL *s)
{
EVP_MD_CTX_free(S3I(s)->handshake_hash);
S3I(s)->handshake_hash = NULL;
}
int
tls1_transcript_init(SSL *s)
{
if (S3I(s)->handshake_transcript != NULL)
return 0;
if ((S3I(s)->handshake_transcript = BUF_MEM_new()) == NULL)
return 0;
tls1_transcript_reset(s);
return 1;
}
void
tls1_transcript_free(SSL *s)
{
BUF_MEM_free(S3I(s)->handshake_transcript);
S3I(s)->handshake_transcript = NULL;
}
void
tls1_transcript_reset(SSL *s)
{
/*
* We should check the return value of BUF_MEM_grow_clean(), however
* due to yet another bad API design, when called with a length of zero
* it is impossible to tell if it succeeded (returning a length of zero)
* or if it failed (and returned zero)... our implementation never
* fails with a length of zero, so we trust all is okay...
*/
(void)BUF_MEM_grow_clean(S3I(s)->handshake_transcript, 0);
tls1_transcript_unfreeze(s);
}
int
tls1_transcript_append(SSL *s, const unsigned char *buf, size_t len)
{
size_t olen, nlen;
if (S3I(s)->handshake_transcript == NULL)
return 1;
if (s->s3->flags & TLS1_FLAGS_FREEZE_TRANSCRIPT)
return 1;
olen = S3I(s)->handshake_transcript->length;
nlen = olen + len;
if (nlen < olen)
return 0;
if (BUF_MEM_grow(S3I(s)->handshake_transcript, nlen) == 0)
return 0;
memcpy(S3I(s)->handshake_transcript->data + olen, buf, len);
return 1;
}
int
tls1_transcript_data(SSL *s, const unsigned char **data, size_t *len)
{
if (S3I(s)->handshake_transcript == NULL)
return 0;
*data = S3I(s)->handshake_transcript->data;
*len = S3I(s)->handshake_transcript->length;
return 1;
}
void
tls1_transcript_freeze(SSL *s)
{
s->s3->flags |= TLS1_FLAGS_FREEZE_TRANSCRIPT;
}
void
tls1_transcript_unfreeze(SSL *s)
{
s->s3->flags &= ~TLS1_FLAGS_FREEZE_TRANSCRIPT;
}
int
tls1_transcript_record(SSL *s, const unsigned char *buf, size_t len)
{
if (!tls1_transcript_hash_update(s, buf, len))
return 0;
if (!tls1_transcript_append(s, buf, len))
return 0;
return 1;
}