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Implement API for configuration of opaque PSKs

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This commit adds implementations of the two new API functions

mbedtls_ssl_conf_psk_opaque()
mbedtls_ssl_set_hs_psk_opaque().
This commit is contained in:
Hanno Becker 2018-10-22 15:31:26 +01:00
parent 4363313976
commit d20a8ca733
1 changed files with 95 additions and 21 deletions
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116
library/ssl_tls.c
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@ -7326,6 +7326,37 @@ int mbedtls_ssl_set_hs_ecjpake_password( mbedtls_ssl_context *ssl,
#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
static void ssl_conf_remove_psk( mbedtls_ssl_config *conf )
{
/* Remove reference to existing PSK, if any. */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( conf->psk_opaque != 0 )
{
/* The maintenance of the PSK key slot is the
* user's responsibility. */
conf->psk_opaque = 0;
}
else
#endif /* MBEDTLS_USE_PSA_CRYPTO */
if( conf->psk != NULL )
{
mbedtls_platform_zeroize( conf->psk, conf->psk_len );
mbedtls_free( conf->psk );
conf->psk = NULL;
conf->psk_len = 0;
}
/* Remove reference to PSK identity, if any. */
if( conf->psk_identity != NULL )
{
mbedtls_free( conf->psk_identity );
conf->psk_identity = NULL;
conf->psk_identity_len = 0;
}
}
int mbedtls_ssl_conf_psk( mbedtls_ssl_config *conf,
const unsigned char *psk, size_t psk_len,
const unsigned char *psk_identity, size_t psk_identity_len )
@ -7343,20 +7374,7 @@ int mbedtls_ssl_conf_psk( mbedtls_ssl_config *conf,
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
if( conf->psk != NULL )
{
mbedtls_platform_zeroize( conf->psk, conf->psk_len );
mbedtls_free( conf->psk );
conf->psk = NULL;
conf->psk_len = 0;
}
if( conf->psk_identity != NULL )
{
mbedtls_free( conf->psk_identity );
conf->psk_identity = NULL;
conf->psk_identity_len = 0;
}
ssl_conf_remove_psk( conf );
if( ( conf->psk = mbedtls_calloc( 1, psk_len ) ) == NULL ||
( conf->psk_identity = mbedtls_calloc( 1, psk_identity_len ) ) == NULL )
@ -7377,6 +7395,24 @@ int mbedtls_ssl_conf_psk( mbedtls_ssl_config *conf,
return( 0 );
}
static void ssl_remove_psk( mbedtls_ssl_context *ssl )
{
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( ssl->handshake->psk_opaque != 0 )
{
ssl->handshake->psk_opaque = 0;
}
else
#endif /* MBEDTLS_USE_PSA_CRYPTO */
if( ssl->handshake->psk != NULL )
{
mbedtls_platform_zeroize( ssl->handshake->psk,
ssl->handshake->psk_len );
mbedtls_free( ssl->handshake->psk );
ssl->handshake->psk_len = 0;
}
}
int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl,
const unsigned char *psk, size_t psk_len )
{
@ -7386,13 +7422,7 @@ int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl,
if( psk_len > MBEDTLS_PSK_MAX_LEN )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
if( ssl->handshake->psk != NULL )
{
mbedtls_platform_zeroize( ssl->handshake->psk,
ssl->handshake->psk_len );
mbedtls_free( ssl->handshake->psk );
ssl->handshake->psk_len = 0;
}
ssl_remove_psk( ssl );
if( ( ssl->handshake->psk = mbedtls_calloc( 1, psk_len ) ) == NULL )
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
@ -7403,6 +7433,50 @@ int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl,
return( 0 );
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
int mbedtls_ssl_conf_psk_opaque( mbedtls_ssl_config *conf,
psa_key_slot_t psk_slot,
const unsigned char *psk_identity,
size_t psk_identity_len )
{
if( psk_slot == 0 || psk_identity == NULL )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
/* Identity len will be encoded on two bytes */
if( ( psk_identity_len >> 16 ) != 0 ||
psk_identity_len > MBEDTLS_SSL_OUT_CONTENT_LEN )
{
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
ssl_conf_remove_psk( conf );
if( ( conf->psk_identity = mbedtls_calloc( 1, psk_identity_len ) ) == NULL )
{
mbedtls_free( conf->psk_identity );
conf->psk_identity = NULL;
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
}
conf->psk_identity_len = psk_identity_len;
memcpy( conf->psk_identity, psk_identity, conf->psk_identity_len );
conf->psk_opaque = psk_slot;
return( 0 );
}
int mbedtls_ssl_set_hs_psk_opaque( mbedtls_ssl_context *ssl,
psa_key_slot_t psk_slot )
{
if( psk_slot == 0 || ssl->handshake == NULL )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
ssl_remove_psk( ssl );
ssl->handshake->psk_opaque = psk_slot;
return( 0 );
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
void mbedtls_ssl_conf_psk_cb( mbedtls_ssl_config *conf,
int (*f_psk)(void *, mbedtls_ssl_context *, const unsigned char *,
size_t),