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Use the dedicated dummy_random in fuzzing programs

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Also make sure to initialize the DRBG before using it in fuzz_server
(dummy_random uses ctr_drbg internally).

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit is contained in:
Manuel Pégourié-Gonnard 2021-06-16 10:20:30 +02:00
parent 36a8963b3b
commit 7f93da1265
3 changed files with 11 additions and 12 deletions
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3
programs/fuzz/fuzz_dtlsserver.c
View File

@ -6,7 +6,6 @@
#include "common.h"
#include "mbedtls/ssl.h"
#include "test/certs.h"
#include "test/random.h"
#if defined(MBEDTLS_SSL_PROTO_DTLS)
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
@ -57,7 +56,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
return 1;
if (mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
mbedtls_test_srv_key_len, NULL, 0,
mbedtls_test_rnd_std_rand, NULL ) != 0)
dummy_random, NULL ) != 0)
return 1;
#endif
dummy_init();

4
programs/fuzz/fuzz_privkey.c
View File

@ -3,7 +3,7 @@
#include <stdint.h>
#include <stdlib.h>
#include "mbedtls/pk.h"
#include "test/random.h"
#include "common.h"
//4 Kb should be enough for every bug ;-)
#define MAX_LEN 0x1000
@ -21,7 +21,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
mbedtls_pk_init( &pk );
ret = mbedtls_pk_parse_key( &pk, Data, Size, NULL, 0,
mbedtls_test_rnd_std_rand, NULL );
dummy_random, NULL );
if (ret == 0) {
#if defined(MBEDTLS_RSA_C)
if( mbedtls_pk_get_type( &pk ) == MBEDTLS_PK_RSA )

16
programs/fuzz/fuzz_server.c
View File

@ -56,6 +56,13 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
options = Data[Size - 1];
if (initialized == 0) {
mbedtls_ctr_drbg_init( &ctr_drbg );
mbedtls_entropy_init( &entropy );
if( mbedtls_ctr_drbg_seed( &ctr_drbg, dummy_entropy, &entropy,
(const unsigned char *) pers, strlen( pers ) ) != 0 )
return 1;
#if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
mbedtls_x509_crt_init( &srvcert );
mbedtls_pk_init( &pkey );
@ -67,7 +74,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
return 1;
if (mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
mbedtls_test_srv_key_len, NULL, 0,
mbedtls_ctr_drbg_random, &ctr_drbg ) != 0)
dummy_random, &ctr_drbg ) != 0)
return 1;
#endif
@ -81,17 +88,10 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
}
mbedtls_ssl_init( &ssl );
mbedtls_ssl_config_init( &conf );
mbedtls_ctr_drbg_init( &ctr_drbg );
mbedtls_entropy_init( &entropy );
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
mbedtls_ssl_ticket_init( &ticket_ctx );
#endif
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_SERVER,
MBEDTLS_SSL_TRANSPORT_STREAM,