1 #define MBEDTLS_ALLOW_PRIVATE_ACCESS
2
3 #include "mbedtls/ssl.h"
4 #include "mbedtls/entropy.h"
5 #include "mbedtls/ctr_drbg.h"
6 #include "mbedtls/ssl_ticket.h"
7 #include "test/certs.h"
8 #include "common.h"
9 #include <string.h>
10 #include <stdlib.h>
11 #include <stdint.h>
12
13
14 #if defined(MBEDTLS_SSL_SRV_C) && \
15 defined(MBEDTLS_ENTROPY_C) && \
16 defined(MBEDTLS_CTR_DRBG_C)
17 const char *pers = "fuzz_server";
18 static int initialized = 0;
19 #if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
20 static mbedtls_x509_crt srvcert;
21 static mbedtls_pk_context pkey;
22 #endif
23 const char *alpn_list[3];
24
25 #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
26 const unsigned char psk[] = {
27 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
28 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f
29 };
30 const char psk_id[] = "Client_identity";
31 #endif
32 #endif // MBEDTLS_SSL_SRV_C && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C
33
34
LLVMFuzzerTestOneInput(const uint8_t * Data,size_t Size)35 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
36 #if defined(MBEDTLS_SSL_SRV_C) && \
37 defined(MBEDTLS_ENTROPY_C) && \
38 defined(MBEDTLS_CTR_DRBG_C)
39 int ret;
40 size_t len;
41 mbedtls_ssl_context ssl;
42 mbedtls_ssl_config conf;
43 mbedtls_ctr_drbg_context ctr_drbg;
44 mbedtls_entropy_context entropy;
45 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
46 mbedtls_ssl_ticket_context ticket_ctx;
47 #endif
48 unsigned char buf[4096];
49 fuzzBufferOffset_t biomemfuzz;
50 uint8_t options;
51
52 //we take 1 byte as options input
53 if (Size < 1) {
54 return 0;
55 }
56 options = Data[Size - 1];
57
58 if (initialized == 0) {
59 mbedtls_ctr_drbg_init( &ctr_drbg );
60 mbedtls_entropy_init( &entropy );
61
62 if( mbedtls_ctr_drbg_seed( &ctr_drbg, dummy_entropy, &entropy,
63 (const unsigned char *) pers, strlen( pers ) ) != 0 )
64 return 1;
65
66 #if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
67 mbedtls_x509_crt_init( &srvcert );
68 mbedtls_pk_init( &pkey );
69 if (mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_srv_crt,
70 mbedtls_test_srv_crt_len ) != 0)
71 return 1;
72 if (mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_cas_pem,
73 mbedtls_test_cas_pem_len ) != 0)
74 return 1;
75 if (mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
76 mbedtls_test_srv_key_len, NULL, 0,
77 dummy_random, &ctr_drbg ) != 0)
78 return 1;
79 #endif
80
81 alpn_list[0] = "HTTP";
82 alpn_list[1] = "fuzzalpn";
83 alpn_list[2] = NULL;
84
85 dummy_init();
86
87 initialized = 1;
88 }
89 mbedtls_ssl_init( &ssl );
90 mbedtls_ssl_config_init( &conf );
91 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
92 mbedtls_ssl_ticket_init( &ticket_ctx );
93 #endif
94
95 if( mbedtls_ssl_config_defaults( &conf,
96 MBEDTLS_SSL_IS_SERVER,
97 MBEDTLS_SSL_TRANSPORT_STREAM,
98 MBEDTLS_SSL_PRESET_DEFAULT ) != 0 )
99 goto exit;
100
101 srand(1);
102 mbedtls_ssl_conf_rng( &conf, dummy_random, &ctr_drbg );
103
104 #if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
105 mbedtls_ssl_conf_ca_chain( &conf, srvcert.next, NULL );
106 if( mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) != 0 )
107 goto exit;
108 #endif
109
110 mbedtls_ssl_conf_cert_req_ca_list( &conf, (options & 0x1) ? MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED : MBEDTLS_SSL_CERT_REQ_CA_LIST_DISABLED );
111 #if defined(MBEDTLS_SSL_ALPN)
112 if (options & 0x2) {
113 mbedtls_ssl_conf_alpn_protocols( &conf, alpn_list );
114 }
115 #endif
116 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
117 if( options & 0x4 )
118 {
119 if( mbedtls_ssl_ticket_setup( &ticket_ctx,
120 dummy_random, &ctr_drbg,
121 MBEDTLS_CIPHER_AES_256_GCM,
122 86400 ) != 0 )
123 goto exit;
124
125 mbedtls_ssl_conf_session_tickets_cb( &conf,
126 mbedtls_ssl_ticket_write,
127 mbedtls_ssl_ticket_parse,
128 &ticket_ctx );
129 }
130 #endif
131 #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
132 mbedtls_ssl_conf_extended_master_secret( &conf, (options & 0x10) ? MBEDTLS_SSL_EXTENDED_MS_DISABLED : MBEDTLS_SSL_EXTENDED_MS_ENABLED);
133 #endif
134 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
135 mbedtls_ssl_conf_encrypt_then_mac( &conf, (options & 0x20) ? MBEDTLS_SSL_ETM_ENABLED : MBEDTLS_SSL_ETM_DISABLED);
136 #endif
137 #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
138 if (options & 0x40) {
139 mbedtls_ssl_conf_psk( &conf, psk, sizeof( psk ),
140 (const unsigned char *) psk_id, sizeof( psk_id ) - 1 );
141 }
142 #endif
143 #if defined(MBEDTLS_SSL_RENEGOTIATION)
144 mbedtls_ssl_conf_renegotiation( &conf, (options & 0x80) ? MBEDTLS_SSL_RENEGOTIATION_ENABLED : MBEDTLS_SSL_RENEGOTIATION_DISABLED );
145 #endif
146
147 if( mbedtls_ssl_setup( &ssl, &conf ) != 0 )
148 goto exit;
149
150 biomemfuzz.Data = Data;
151 biomemfuzz.Size = Size-1;
152 biomemfuzz.Offset = 0;
153 mbedtls_ssl_set_bio( &ssl, &biomemfuzz, dummy_send, fuzz_recv, NULL );
154
155 mbedtls_ssl_session_reset( &ssl );
156 ret = mbedtls_ssl_handshake( &ssl );
157 if( ret == 0 )
158 {
159 //keep reading data from server until the end
160 do
161 {
162 len = sizeof( buf ) - 1;
163 ret = mbedtls_ssl_read( &ssl, buf, len );
164
165 if( ret == MBEDTLS_ERR_SSL_WANT_READ )
166 continue;
167 else if( ret <= 0 )
168 //EOF or error
169 break;
170 }
171 while( 1 );
172 }
173
174 exit:
175 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
176 mbedtls_ssl_ticket_free( &ticket_ctx );
177 #endif
178 mbedtls_entropy_free( &entropy );
179 mbedtls_ctr_drbg_free( &ctr_drbg );
180 mbedtls_ssl_config_free( &conf );
181 mbedtls_ssl_free( &ssl );
182
183 #else
184 (void) Data;
185 (void) Size;
186 #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */
187
188 return 0;
189 }
190