mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-11-23 20:15:38 +01:00
187 lines
4.8 KiB
C
187 lines
4.8 KiB
C
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
#include "mbedtls/ssl.h"
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
#include "mbedtls/entropy.h"
|
|
#include "mbedtls/ctr_drbg.h"
|
|
#include "mbedtls/certs.h"
|
|
#include "mbedtls/timing.h"
|
|
|
|
|
|
static bool initialized = 0;
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
|
static mbedtls_x509_crt cacert;
|
|
#endif
|
|
|
|
|
|
const char *pers = "fuzz_dtlsclient";
|
|
|
|
|
|
typedef struct fuzzBufferOffset
|
|
{
|
|
const uint8_t *Data;
|
|
size_t Size;
|
|
size_t Offset;
|
|
} fuzzBufferOffset_t;
|
|
|
|
static int dummy_send( void *ctx, const unsigned char *buf, size_t len )
|
|
{
|
|
//silence warning about unused parameter
|
|
(void) ctx;
|
|
(void) buf;
|
|
|
|
//pretends we wrote everything ok
|
|
return( len );
|
|
}
|
|
|
|
static int fuzz_recv( void *ctx, unsigned char *buf, size_t len )
|
|
{
|
|
//reads from the buffer from fuzzer
|
|
fuzzBufferOffset_t * biomemfuzz = (fuzzBufferOffset_t *) ctx;
|
|
|
|
if (biomemfuzz->Offset == biomemfuzz->Size) {
|
|
//EOF
|
|
return (0);
|
|
}
|
|
if (len + biomemfuzz->Offset > biomemfuzz->Size) {
|
|
//do not overflow
|
|
len = biomemfuzz->Size - biomemfuzz->Offset;
|
|
}
|
|
memcpy(buf, biomemfuzz->Data + biomemfuzz->Offset, len);
|
|
biomemfuzz->Offset += len;
|
|
return( len );
|
|
}
|
|
|
|
static int fuzz_recv_timeout( void *ctx, unsigned char *buf, size_t len,
|
|
uint32_t timeout )
|
|
{
|
|
(void) timeout;
|
|
|
|
return fuzz_recv(ctx, buf, len);
|
|
}
|
|
|
|
static int dummy_random( void *p_rng, unsigned char *output, size_t output_len )
|
|
{
|
|
int ret;
|
|
size_t i;
|
|
|
|
//use mbedtls_ctr_drbg_random to find bugs in it
|
|
ret = mbedtls_ctr_drbg_random(p_rng, output, output_len);
|
|
for (i=0; i<output_len; i++) {
|
|
//replace result with pseudo random
|
|
output[i] = (unsigned char) random();
|
|
}
|
|
return( ret );
|
|
}
|
|
|
|
static int dummy_entropy( void *data, unsigned char *output, size_t len )
|
|
{
|
|
size_t i;
|
|
(void) data;
|
|
|
|
//use mbedtls_entropy_func to find bugs in it
|
|
//test performance impact of entropy
|
|
//ret = mbedtls_entropy_func(data, output, len);
|
|
for (i=0; i<len; i++) {
|
|
//replace result with pseudo random
|
|
output[i] = (unsigned char) random();
|
|
}
|
|
return( 0 );
|
|
}
|
|
#endif
|
|
|
|
|
|
|
|
int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
int ret;
|
|
size_t len;
|
|
mbedtls_ssl_context ssl;
|
|
mbedtls_ssl_config conf;
|
|
mbedtls_ctr_drbg_context ctr_drbg;
|
|
mbedtls_entropy_context entropy;
|
|
mbedtls_timing_delay_context timer;
|
|
unsigned char buf[4096];
|
|
fuzzBufferOffset_t biomemfuzz;
|
|
|
|
if (initialized == 0) {
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
|
mbedtls_x509_crt_init( &cacert );
|
|
if (mbedtls_x509_crt_parse( &cacert, (const unsigned char *) mbedtls_test_cas_pem,
|
|
mbedtls_test_cas_pem_len ) != 0)
|
|
return 1;
|
|
#endif
|
|
initialized = 1;
|
|
}
|
|
|
|
mbedtls_ssl_init( &ssl );
|
|
mbedtls_ssl_config_init( &conf );
|
|
mbedtls_ctr_drbg_init( &ctr_drbg );
|
|
mbedtls_entropy_init( &entropy );
|
|
|
|
srandom(1);
|
|
if( mbedtls_ctr_drbg_seed( &ctr_drbg, dummy_entropy, &entropy,
|
|
(const unsigned char *) pers, strlen( pers ) ) != 0 )
|
|
goto exit;
|
|
|
|
if( mbedtls_ssl_config_defaults( &conf,
|
|
MBEDTLS_SSL_IS_CLIENT,
|
|
MBEDTLS_SSL_TRANSPORT_DATAGRAM,
|
|
MBEDTLS_SSL_PRESET_DEFAULT ) != 0 )
|
|
goto exit;
|
|
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
|
mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
|
|
#endif
|
|
mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_NONE );
|
|
mbedtls_ssl_conf_rng( &conf, dummy_random, &ctr_drbg );
|
|
|
|
if( mbedtls_ssl_setup( &ssl, &conf ) != 0 )
|
|
goto exit;
|
|
|
|
mbedtls_ssl_set_timer_cb( &ssl, &timer, mbedtls_timing_set_delay,
|
|
mbedtls_timing_get_delay );
|
|
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
|
if( mbedtls_ssl_set_hostname( &ssl, "localhost" ) != 0 )
|
|
goto exit;
|
|
#endif
|
|
|
|
biomemfuzz.Data = Data;
|
|
biomemfuzz.Size = Size;
|
|
biomemfuzz.Offset = 0;
|
|
mbedtls_ssl_set_bio( &ssl, &biomemfuzz, dummy_send, fuzz_recv, fuzz_recv_timeout );
|
|
|
|
ret = mbedtls_ssl_handshake( &ssl );
|
|
if( ret == 0 )
|
|
{
|
|
//keep reading data from server until the end
|
|
do
|
|
{
|
|
len = sizeof( buf ) - 1;
|
|
ret = mbedtls_ssl_read( &ssl, buf, len );
|
|
|
|
if( ret == MBEDTLS_ERR_SSL_WANT_READ )
|
|
continue;
|
|
else if( ret <= 0 )
|
|
//EOF or error
|
|
break;
|
|
}
|
|
while( 1 );
|
|
}
|
|
|
|
exit:
|
|
mbedtls_entropy_free( &entropy );
|
|
mbedtls_ctr_drbg_free( &ctr_drbg );
|
|
mbedtls_ssl_config_free( &conf );
|
|
mbedtls_ssl_free( &ssl );
|
|
|
|
#else
|
|
(void) Data;
|
|
(void) Size;
|
|
#endif
|
|
return 0;
|
|
}
|