mbedtls/programs/ssl/ssl_test_lib.c
Gilles Peskine 535fb37870 SSL test programs: abstract CTR_DRBG away
In ssl_client2 and ssl_server2, to generate random data, go through a
level of indirection provided by ssl_test_lib. This way the programs
don't depend on a particular choice of RNG implementation, and only
ssl_test_lib.{h,c} explicitly reference CTR_DRBG.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2021-01-13 20:18:32 +01:00

240 lines
6.2 KiB
C

/*
* Common code library for SSL test programs.
*
* In addition to the functions in this file, there is shared source code
* that cannot be compiled separately in "ssl_test_common_source.c".
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "ssl_test_lib.h"
#if !defined(MBEDTLS_SSL_TEST_IMPOSSIBLE)
void my_debug( void *ctx, int level,
const char *file, int line,
const char *str )
{
const char *p, *basename;
/* Extract basename from file */
for( p = basename = file; *p != '\0'; p++ )
if( *p == '/' || *p == '\\' )
basename = p + 1;
mbedtls_fprintf( (FILE *) ctx, "%s:%04d: |%d| %s",
basename, line, level, str );
fflush( (FILE *) ctx );
}
mbedtls_time_t dummy_constant_time( mbedtls_time_t* time )
{
(void) time;
return 0x5af2a056;
}
static int dummy_entropy( void *data, unsigned char *output, size_t len )
{
size_t i;
int ret;
(void) data;
ret = mbedtls_entropy_func( data, output, len );
for( i = 0; i < len; i++ )
{
//replace result with pseudo random
output[i] = (unsigned char) rand();
}
return( ret );
}
void rng_init( rng_context_t *rng )
{
mbedtls_ctr_drbg_init( &rng->drbg );
mbedtls_entropy_init( &rng->entropy );
}
int rng_seed( rng_context_t *rng, int reproducible, const char *pers )
{
int ( *f_entropy )( void *, unsigned char *, size_t ) =
( reproducible ? dummy_entropy : mbedtls_entropy_func );
if ( reproducible )
srand( 1 );
int ret = mbedtls_ctr_drbg_seed( &rng->drbg,
f_entropy, &rng->entropy,
(const unsigned char *) pers,
strlen( pers ) );
if( ret != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned -0x%x\n",
(unsigned int) -ret );
return( ret );
}
return( 0 );
}
void rng_free( rng_context_t *rng )
{
mbedtls_ctr_drbg_free( &rng->drbg );
mbedtls_entropy_free( &rng->entropy );
}
int rng_get( void *p_rng, unsigned char *output, size_t output_len )
{
rng_context_t *rng = p_rng;
return( mbedtls_ctr_drbg_random( &rng->drbg, output, output_len ) );
}
#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
int ca_callback( void *data, mbedtls_x509_crt const *child,
mbedtls_x509_crt **candidates )
{
int ret = 0;
mbedtls_x509_crt *ca = (mbedtls_x509_crt *) data;
mbedtls_x509_crt *first;
/* This is a test-only implementation of the CA callback
* which always returns the entire list of trusted certificates.
* Production implementations managing a large number of CAs
* should use an efficient presentation and lookup for the
* set of trusted certificates (such as a hashtable) and only
* return those trusted certificates which satisfy basic
* parental checks, such as the matching of child `Issuer`
* and parent `Subject` field or matching key identifiers. */
((void) child);
first = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) );
if( first == NULL )
{
ret = -1;
goto exit;
}
mbedtls_x509_crt_init( first );
if( mbedtls_x509_crt_parse_der( first, ca->raw.p, ca->raw.len ) != 0 )
{
ret = -1;
goto exit;
}
while( ca->next != NULL )
{
ca = ca->next;
if( mbedtls_x509_crt_parse_der( first, ca->raw.p, ca->raw.len ) != 0 )
{
ret = -1;
goto exit;
}
}
exit:
if( ret != 0 )
{
mbedtls_x509_crt_free( first );
mbedtls_free( first );
first = NULL;
}
*candidates = first;
return( ret );
}
#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
int delayed_recv( void *ctx, unsigned char *buf, size_t len )
{
static int first_try = 1;
int ret;
if( first_try )
{
first_try = 0;
return( MBEDTLS_ERR_SSL_WANT_READ );
}
ret = mbedtls_net_recv( ctx, buf, len );
if( ret != MBEDTLS_ERR_SSL_WANT_READ )
first_try = 1; /* Next call will be a new operation */
return( ret );
}
int delayed_send( void *ctx, const unsigned char *buf, size_t len )
{
static int first_try = 1;
int ret;
if( first_try )
{
first_try = 0;
return( MBEDTLS_ERR_SSL_WANT_WRITE );
}
ret = mbedtls_net_send( ctx, buf, len );
if( ret != MBEDTLS_ERR_SSL_WANT_WRITE )
first_try = 1; /* Next call will be a new operation */
return( ret );
}
#if !defined(MBEDTLS_TIMING_C)
int idle( mbedtls_net_context *fd,
int idle_reason )
#else
int idle( mbedtls_net_context *fd,
mbedtls_timing_delay_context *timer,
int idle_reason )
#endif
{
int ret;
int poll_type = 0;
if( idle_reason == MBEDTLS_ERR_SSL_WANT_WRITE )
poll_type = MBEDTLS_NET_POLL_WRITE;
else if( idle_reason == MBEDTLS_ERR_SSL_WANT_READ )
poll_type = MBEDTLS_NET_POLL_READ;
#if !defined(MBEDTLS_TIMING_C)
else
return( 0 );
#endif
while( 1 )
{
/* Check if timer has expired */
#if defined(MBEDTLS_TIMING_C)
if( timer != NULL &&
mbedtls_timing_get_delay( timer ) == 2 )
{
break;
}
#endif /* MBEDTLS_TIMING_C */
/* Check if underlying transport became available */
if( poll_type != 0 )
{
ret = mbedtls_net_poll( fd, poll_type, 0 );
if( ret < 0 )
return( ret );
if( ret == poll_type )
break;
}
}
return( 0 );
}
#endif /* !defined(MBEDTLS_SSL_TEST_IMPOSSIBLE) */