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Protect setting of premaster_generated flag

Browse source 
The flag is used for tracking if the premaster has
been succesfully generated. Note that when resuming
a session, the flag should not be used when trying to
notice if all the key generation/derivation has been done.
This commit is contained in:
Jarno Lamsa 2019-12-18 16:28:51 +02:00
parent 98801af26b
commit 67f0a1e833
3 changed files with 112 additions and 19 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

38
library/ssl_cli.c
View file

@ -2342,8 +2342,9 @@ static int ssl_rsa_generate_partial_pms( mbedtls_ssl_context *ssl,
unsigned char* out,
unsigned add_length_tag )
{
int ret;
volatile int ret;
ssl->handshake->premaster_generated = MBEDTLS_SSL_FI_FLAG_UNSET;
/*
* Generate (part of) the pre-master secret as
* struct {
@ -2364,14 +2365,21 @@ static int ssl_rsa_generate_partial_pms( mbedtls_ssl_context *ssl,
mbedtls_ssl_conf_get_max_minor_ver( ssl->conf ),
ssl->conf->transport, out );
if( ( ret = mbedtls_ssl_conf_get_frng( ssl->conf )
( mbedtls_ssl_conf_get_prng( ssl->conf ), out + 2, 46 ) ) != 0 )
ret = mbedtls_ssl_conf_get_frng( ssl->conf )
( mbedtls_ssl_conf_get_prng( ssl->conf ), out + 2, 46 );
if( ret == 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "f_rng", ret );
return( ret );
mbedtls_platform_enforce_volatile_reads();
if( ret == 0 )
{
ssl->handshake->premaster_generated = MBEDTLS_SSL_FI_FLAG_SET;
return( 0 );
}
}
return( 0 );
MBEDTLS_SSL_DEBUG_RET( 1, "f_rng", ret );
return( ret );
}
/*
@ -2383,11 +2391,12 @@ static int ssl_rsa_encrypt_partial_pms( mbedtls_ssl_context *ssl,
unsigned char *out, size_t buflen,
size_t *olen )
{
int ret;
volatile int ret;
size_t len_bytes = mbedtls_ssl_get_minor_ver( ssl ) ==
MBEDTLS_SSL_MINOR_VERSION_0 ? 0 : 2;
mbedtls_pk_context *peer_pk = NULL;
ssl->handshake->premaster_generated = MBEDTLS_SSL_FI_FLAG_UNSET;
if( buflen < len_bytes )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small for encrypted pms" ) );
@ -2427,16 +2436,27 @@ static int ssl_rsa_encrypt_partial_pms( mbedtls_ssl_context *ssl,
goto cleanup;
}
if( ( ret = mbedtls_pk_encrypt( peer_pk,
ret = mbedtls_pk_encrypt( peer_pk,
ppms, 48, out + len_bytes,
olen, buflen - len_bytes,
mbedtls_ssl_conf_get_frng( ssl->conf ),
mbedtls_ssl_conf_get_prng( ssl->conf ) ) ) != 0 )
mbedtls_ssl_conf_get_prng( ssl->conf ) );
if( ret == 0 )
{
mbedtls_platform_enforce_volatile_reads();
if( ret == 0 )
{
ssl->handshake->premaster_generated = MBEDTLS_SSL_FI_FLAG_SET;
}
}
else
{
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_rsa_pkcs1_encrypt", ret );
goto cleanup;
}
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
defined(MBEDTLS_SSL_PROTO_TLS1_2)
if( len_bytes == 2 )

14
library/ssl_srv.c
View file

@ -3978,7 +3978,9 @@ static int ssl_parse_encrypted_pms( mbedtls_ssl_context *ssl,
unsigned char mask;
size_t i, peer_pmslen;
unsigned int diff;
volatile unsigned int pmscounter = 0;
ssl->handshake->premaster_generated = MBEDTLS_SSL_FI_FLAG_UNSET;
/* In case of a failure in decryption, the decryption may write less than
* 2 bytes of output, but we always read the first two bytes. It doesn't
* matter in the end because diff will be nonzero in that case due to
@ -4056,7 +4058,19 @@ static int ssl_parse_encrypted_pms( mbedtls_ssl_context *ssl,
/* Set pms to either the true or the fake PMS, without
* data-dependent branches. */
for( i = 0; i < ssl->handshake->pmslen; i++ )
{
pms[i] = ( mask & fake_pms[i] ) | ( (~mask) & peer_pms[i] );
pmscounter++;
}
if( pmscounter == ssl->handshake->pmslen )
{
mbedtls_platform_enforce_volatile_reads();
if( pmscounter == ssl->handshake->pmslen )
{
ssl->handshake->premaster_generated = MBEDTLS_SSL_FI_FLAG_SET;
}
}
return( 0 );
}

79
library/ssl_tls.c
View file

@ -1881,7 +1881,7 @@ static int ssl_compute_master( mbedtls_ssl_handshake_params *handshake,
int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
{
int ret;
volatile int ret;
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> derive keys" ) );
@ -1958,11 +1958,11 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
int mbedtls_ssl_build_pms( mbedtls_ssl_context *ssl )
{
int ret;
volatile int ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
mbedtls_ssl_ciphersuite_handle_t ciphersuite_info =
mbedtls_ssl_handshake_get_ciphersuite( ssl->handshake );
ssl->handshake->premaster_generated = MBEDTLS_SSL_FI_FLAG_UNSET;
#if defined(MBEDTLS_USE_TINYCRYPT)
if( mbedtls_ssl_suite_get_key_exchange( ciphersuite_info )
== MBEDTLS_KEY_EXCHANGE_ECDHE_RSA ||
@ -1980,6 +1980,7 @@ int mbedtls_ssl_build_pms( mbedtls_ssl_context *ssl )
return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
if( ret != UECC_SUCCESS )
return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
ssl->handshake->premaster_generated = MBEDTLS_SSL_FI_FLAG_SET;
ssl->handshake->pmslen = NUM_ECC_BYTES;
}
@ -1989,12 +1990,26 @@ int mbedtls_ssl_build_pms( mbedtls_ssl_context *ssl )
if( mbedtls_ssl_suite_get_key_exchange( ciphersuite_info )
== MBEDTLS_KEY_EXCHANGE_DHE_RSA )
{
if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx,
ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx,
ssl->handshake->premaster,
MBEDTLS_PREMASTER_SIZE,
&ssl->handshake->pmslen,
mbedtls_ssl_conf_get_frng( ssl->conf ),
mbedtls_ssl_conf_get_prng( ssl->conf ) ) ) != 0 )
mbedtls_ssl_conf_get_prng( ssl->conf ) );
if( ret == 0 )
{
mbedtls_platform_enforce_volatile_reads();
if( ret == 0 )
{
ssl->handshake->premaster_generated = MBEDTLS_SSL_FI_FLAG_SET;
}
else
{
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret );
return( ret );
}
}
else
{
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret );
return( ret );
@ -2018,12 +2033,26 @@ int mbedtls_ssl_build_pms( mbedtls_ssl_context *ssl )
mbedtls_ssl_suite_get_key_exchange( ciphersuite_info )
== MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA )
{
if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx,
ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx,
&ssl->handshake->pmslen,
ssl->handshake->premaster,
MBEDTLS_MPI_MAX_SIZE,
mbedtls_ssl_conf_get_frng( ssl->conf ),
mbedtls_ssl_conf_get_prng( ssl->conf ) ) ) != 0 )
mbedtls_ssl_conf_get_prng( ssl->conf ) );
if( ret == 0 )
{
mbedtls_platform_enforce_volatile_reads();
if( ret == 0 )
{
ssl->handshake->premaster_generated = MBEDTLS_SSL_FI_FLAG_SET;
}
else
{
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
return( ret );
}
}
else
{
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
return( ret );
@ -2039,8 +2068,22 @@ int mbedtls_ssl_build_pms( mbedtls_ssl_context *ssl )
#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
if( mbedtls_ssl_ciphersuite_uses_psk( ciphersuite_info ) )
{
if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
mbedtls_ssl_suite_get_key_exchange( ciphersuite_info ) ) ) != 0 )
ret = mbedtls_ssl_psk_derive_premaster( ssl,
mbedtls_ssl_suite_get_key_exchange( ciphersuite_info ) );
if( ret == 0 )
{
mbedtls_platform_enforce_volatile_reads();
if( ret == 0 )
{
ssl->handshake->premaster_generated = MBEDTLS_SSL_FI_FLAG_SET;
}
else
{
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
return( ret );
}
}
else
{
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
return( ret );
@ -2056,7 +2099,20 @@ int mbedtls_ssl_build_pms( mbedtls_ssl_context *ssl )
ssl->handshake->premaster, 32, &ssl->handshake->pmslen,
mbedtls_ssl_conf_get_frng( ssl->conf ),
mbedtls_ssl_conf_get_prng( ssl->conf ) );
if( ret != 0 )
if( ret == 0 )
{
mbedtls_platform_enforce_volatile_reads();
if( ret == 0 )
{
ssl->handshake->premaster_generated = MBEDTLS_SSL_FI_FLAG_SET;
}
else
{
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_derive_secret", ret );
return( ret );
}
}
else
{
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_derive_secret", ret );
return( ret );
@ -2091,6 +2147,7 @@ int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exch
unsigned char *end = p + sizeof( ssl->handshake->premaster );
const unsigned char *psk = ssl->conf->psk;
size_t psk_len = ssl->conf->psk_len;
ssl->handshake->premaster_generated = MBEDTLS_SSL_FI_FLAG_UNSET;
/* If the psk callback was called, use its result */
if( ssl->handshake->psk != NULL )
@ -2214,6 +2271,8 @@ int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exch
ssl->handshake->pmslen = p - ssl->handshake->premaster;
ssl->handshake->premaster_generated = MBEDTLS_SSL_FI_FLAG_SET;
return( 0 );
}
#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */