1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
#define MBEDTLS_ALLOW_PRIVATE_ACCESS
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include "common.h"
#include "mbedtls/ssl.h"
#if defined(MBEDTLS_SSL_PROTO_DTLS)
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/timing.h"
#include "test/certs.h"
#if defined(MBEDTLS_SSL_CLI_C) && \
defined(MBEDTLS_ENTROPY_C) && \
defined(MBEDTLS_CTR_DRBG_C) && \
defined(MBEDTLS_TIMING_C)
static int initialized = 0;
#if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
static mbedtls_x509_crt cacert;
#endif
const char *pers = "fuzz_dtlsclient";
#endif
#endif // MBEDTLS_SSL_PROTO_DTLS
int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
#if defined(MBEDTLS_SSL_PROTO_DTLS) && \
defined(MBEDTLS_SSL_CLI_C) && \
defined(MBEDTLS_ENTROPY_C) && \
defined(MBEDTLS_CTR_DRBG_C) && \
defined(MBEDTLS_TIMING_C)
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) && defined(MBEDTLS_PEM_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
dummy_init();
initialized = 1;
}
mbedtls_ssl_init( &ssl );
mbedtls_ssl_config_init( &conf );
mbedtls_ctr_drbg_init( &ctr_drbg );
mbedtls_entropy_init( &entropy );
srand(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) && defined(MBEDTLS_PEM_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) && defined(MBEDTLS_PEM_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;
}
|
