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Improve signature of ssl_compute_master()

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Make it more explicit what's used. Unfortunately, we still need ssl as a
parameter for debugging, and because calc_verify wants it as a parameter (for
all TLS versions except SSL3 it would actually only need handshake, but SSL3
also accesses session_negotiate).

It's also because of calc_verify that we can't make it const yet, but see next
commit.
This commit is contained in:
Manuel Pégourié-Gonnard 2019-05-03 09:46:14 +02:00
parent dafe5227d4
commit c28c8895e5
1 changed files with 35 additions and 11 deletions
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46
library/ssl_tls.c
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@ -1095,13 +1095,33 @@ static int ssl_set_handshake_prfs( mbedtls_ssl_handshake_params *handshake,
/* /*
* Compute master secret if needed * Compute master secret if needed
*
* Parameters:
* [in/out] handshake
* [in] resume, premaster, extended_ms, calc_verify, tls_prf
* [out] premaster (cleared)
* [in] minor_ver (to compute hash_len)
* [in] hash_alg (to compute hash_len)
* [out] master
* [in] ssl: optionally used for debugging and calc_verify
*/ */
static int ssl_compute_master( mbedtls_ssl_context *ssl ) static int ssl_compute_master( mbedtls_ssl_handshake_params *handshake,
int minor_ver,
mbedtls_md_type_t hash_alg,
unsigned char *master,
mbedtls_ssl_context *ssl )
{ {
int ret; int ret;
mbedtls_ssl_handshake_params *handshake = ssl->handshake;
const mbedtls_ssl_ciphersuite_t *ciphersuite_info = handshake->ciphersuite_info; #if !defined(MBEDTLS_DEBUG_C) && !defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
mbedtls_ssl_session *session = ssl->session_negotiate; (void) ssl;
#endif
#if !defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) || !defined(MBEDTLS_SSL_PROTO_TLS1_2)
(void) minor_ver;
#if defined(MBEDTLS_SHA512_C)
(void) hash_alg;
#endif
#endif
if( handshake->resume != 0 ) if( handshake->resume != 0 )
{ {
@ -1113,20 +1133,20 @@ static int ssl_compute_master( mbedtls_ssl_context *ssl )
handshake->pmslen ); handshake->pmslen );
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED ) if( handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED )
{ {
unsigned char session_hash[48]; unsigned char session_hash[48];
size_t hash_len; size_t hash_len;
MBEDTLS_SSL_DEBUG_MSG( 3, ( "using extended master secret" ) ); MBEDTLS_SSL_DEBUG_MSG( 3, ( "using extended master secret" ) );
ssl->handshake->calc_verify( ssl, session_hash ); handshake->calc_verify( ssl, session_hash );
#if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
{ {
#if defined(MBEDTLS_SHA512_C) #if defined(MBEDTLS_SHA512_C)
if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 ) if( hash_alg == MBEDTLS_MD_SHA384 )
{ {
hash_len = 48; hash_len = 48;
} }
@ -1143,7 +1163,7 @@ static int ssl_compute_master( mbedtls_ssl_context *ssl )
ret = handshake->tls_prf( handshake->premaster, handshake->pmslen, ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
"extended master secret", "extended master secret",
session_hash, hash_len, session_hash, hash_len,
session->master, 48 ); master, 48 );
if( ret != 0 ) if( ret != 0 )
{ {
MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret ); MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
@ -1156,7 +1176,7 @@ static int ssl_compute_master( mbedtls_ssl_context *ssl )
ret = handshake->tls_prf( handshake->premaster, handshake->pmslen, ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
"master secret", "master secret",
handshake->randbytes, 64, handshake->randbytes, 64,
session->master, 48 ); master, 48 );
if( ret != 0 ) if( ret != 0 )
{ {
MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret ); MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
@ -1184,7 +1204,11 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
return( ret ); return( ret );
} }
ret = ssl_compute_master( ssl ); ret = ssl_compute_master( ssl->handshake,
ssl->minor_ver,
ciphersuite_info->mac,
ssl->session_negotiate->master,
ssl );
if( ret != 0 ) if( ret != 0 )
{ {
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_compute_master", ret ); MBEDTLS_SSL_DEBUG_RET( 1, "ssl_compute_master", ret );