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Factoring code

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This commit is contained in:
Philippe Antoine 2019-06-04 14:14:33 +02:00
parent 08633825c0
commit 499c735d5e
6 changed files with 88 additions and 278 deletions
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75
tests/fuzz/common.c
View file

@ -1,14 +1,85 @@
#include "common.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "mbedtls/ctr_drbg.h"
mbedtls_time_t dummy_constant_time( mbedtls_time_t* time ) {
mbedtls_time_t dummy_constant_time( mbedtls_time_t* time )
{
(void) time;
return 0x5af2a056;
}
void dummy_init() {
void dummy_init()
{
#if defined(MBEDTLS_PLATFORM_TIME_ALT)
mbedtls_platform_set_time( dummy_constant_time );
#else
fprintf(stderr, "Warning: fuzzing without constant time\n");
#endif
}
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 );
}
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 );
}
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) rand();
}
return( ret );
}
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) rand();
}
return( 0 );
}
int fuzz_recv_timeout( void *ctx, unsigned char *buf, size_t len,
uint32_t timeout )
{
(void) timeout;
return fuzz_recv(ctx, buf, len);
}

15
tests/fuzz/common.h
View file

@ -1,4 +1,19 @@
#include "mbedtls/platform_time.h"
#include <stdint.h>
typedef struct fuzzBufferOffset
{
const uint8_t *Data;
size_t Size;
size_t Offset;
} fuzzBufferOffset_t;
mbedtls_time_t dummy_constant_time( mbedtls_time_t* time );
void dummy_init();
int dummy_send( void *ctx, const unsigned char *buf, size_t len );
int fuzz_recv( void *ctx, unsigned char *buf, size_t len );
int dummy_random( void *p_rng, unsigned char *output, size_t output_len );
int dummy_entropy( void *data, unsigned char *output, size_t len );
int fuzz_recv_timeout( void *ctx, unsigned char *buf, size_t len,
uint32_t timeout );

64
tests/fuzz/fuzz_client.c
View file

@ -27,70 +27,6 @@ const char psk_id[] = "Client_identity";
const char *pers = "fuzz_client";
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 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) rand();
}
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) rand();
}
return( 0 );
}
int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
int ret;
size_t len;

73
tests/fuzz/fuzz_dtlsclient.c
View file

@ -18,79 +18,6 @@ static mbedtls_x509_crt cacert;
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) rand();
}
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) rand();
}
return( 0 );
}
#endif

73
tests/fuzz/fuzz_dtlsserver.c
View file

@ -19,79 +19,6 @@ static bool initialized = 0;
static mbedtls_x509_crt srvcert;
static mbedtls_pk_context pkey;
#endif
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) rand();
}
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) rand();
}
return( 0 );
}
#endif
int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {

66
tests/fuzz/fuzz_server.c
View file

@ -27,72 +27,6 @@ const char psk_id[] = "Client_identity";
#endif
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 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) rand();
}
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) rand();
}
return( 0 );
}
int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
int ret;
size_t len;