1 #include "mbedtls/ssl.h"
2 #include "mbedtls/entropy.h"
3 #include "mbedtls/ctr_drbg.h"
4 #include "mbedtls/ssl_ticket.h"
5 #include "test/certs.h"
6 #include "common.h"
7 #include <string.h>
8 #include <stdlib.h>
9 #include <stdint.h>
10
11
12 #if defined(MBEDTLS_SSL_SRV_C) && \
13 defined(MBEDTLS_ENTROPY_C) && \
14 defined(MBEDTLS_CTR_DRBG_C)
15 const char *pers = "fuzz_server";
16 static int initialized = 0;
17 #if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
18 static mbedtls_x509_crt srvcert;
19 static mbedtls_pk_context pkey;
20 #endif
21 const char *alpn_list[3];
22
23 #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
24 const unsigned char psk[] = {
25 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
26 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f
27 };
28 const char psk_id[] = "Client_identity";
29 #endif
30 #endif // MBEDTLS_SSL_SRV_C && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C
31
32
LLVMFuzzerTestOneInput(const uint8_t * Data,size_t Size)33 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
34 {
35 #if defined(MBEDTLS_SSL_SRV_C) && \
36 defined(MBEDTLS_ENTROPY_C) && \
37 defined(MBEDTLS_CTR_DRBG_C)
38 int ret;
39 size_t len;
40 mbedtls_ssl_context ssl;
41 mbedtls_ssl_config conf;
42 mbedtls_ctr_drbg_context ctr_drbg;
43 mbedtls_entropy_context entropy;
44 #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_TICKET_C)
45 mbedtls_ssl_ticket_context ticket_ctx;
46 #endif
47 unsigned char buf[4096];
48 fuzzBufferOffset_t biomemfuzz;
49 uint8_t options;
50
51 //we take 1 byte as options input
52 if (Size < 1) {
53 return 0;
54 }
55 options = Data[Size - 1];
56
57 mbedtls_ctr_drbg_init(&ctr_drbg);
58 mbedtls_entropy_init(&entropy);
59 #if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
60 mbedtls_x509_crt_init(&srvcert);
61 mbedtls_pk_init(&pkey);
62 #endif
63 mbedtls_ssl_init(&ssl);
64 mbedtls_ssl_config_init(&conf);
65 #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_TICKET_C)
66 mbedtls_ssl_ticket_init(&ticket_ctx);
67 #endif
68 #if defined(MBEDTLS_USE_PSA_CRYPTO)
69 psa_status_t status = psa_crypto_init();
70 if (status != PSA_SUCCESS) {
71 goto exit;
72 }
73 #endif /* MBEDTLS_USE_PSA_CRYPTO */
74
75 if (mbedtls_ctr_drbg_seed(&ctr_drbg, dummy_entropy, &entropy,
76 (const unsigned char *) pers, strlen(pers)) != 0) {
77 return 1;
78 }
79
80 if (initialized == 0) {
81
82 #if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
83 if (mbedtls_x509_crt_parse(&srvcert, (const unsigned char *) mbedtls_test_srv_crt,
84 mbedtls_test_srv_crt_len) != 0) {
85 return 1;
86 }
87 if (mbedtls_x509_crt_parse(&srvcert, (const unsigned char *) mbedtls_test_cas_pem,
88 mbedtls_test_cas_pem_len) != 0) {
89 return 1;
90 }
91 if (mbedtls_pk_parse_key(&pkey, (const unsigned char *) mbedtls_test_srv_key,
92 mbedtls_test_srv_key_len, NULL, 0,
93 dummy_random, &ctr_drbg) != 0) {
94 return 1;
95 }
96 #endif
97
98 alpn_list[0] = "HTTP";
99 alpn_list[1] = "fuzzalpn";
100 alpn_list[2] = NULL;
101
102 dummy_init();
103
104 initialized = 1;
105 }
106
107 if (mbedtls_ssl_config_defaults(&conf,
108 MBEDTLS_SSL_IS_SERVER,
109 MBEDTLS_SSL_TRANSPORT_STREAM,
110 MBEDTLS_SSL_PRESET_DEFAULT) != 0) {
111 goto exit;
112 }
113
114 srand(1);
115 mbedtls_ssl_conf_rng(&conf, dummy_random, &ctr_drbg);
116
117 #if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
118 mbedtls_ssl_conf_ca_chain(&conf, srvcert.next, NULL);
119 if (mbedtls_ssl_conf_own_cert(&conf, &srvcert, &pkey) != 0) {
120 goto exit;
121 }
122 #endif
123
124 mbedtls_ssl_conf_cert_req_ca_list(&conf,
125 (options &
126 0x1) ? MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED : MBEDTLS_SSL_CERT_REQ_CA_LIST_DISABLED);
127 #if defined(MBEDTLS_SSL_ALPN)
128 if (options & 0x2) {
129 mbedtls_ssl_conf_alpn_protocols(&conf, alpn_list);
130 }
131 #endif
132 #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_TICKET_C)
133 if (options & 0x4) {
134 if (mbedtls_ssl_ticket_setup(&ticket_ctx,
135 dummy_random, &ctr_drbg,
136 MBEDTLS_CIPHER_AES_256_GCM,
137 86400) != 0) {
138 goto exit;
139 }
140
141 mbedtls_ssl_conf_session_tickets_cb(&conf,
142 mbedtls_ssl_ticket_write,
143 mbedtls_ssl_ticket_parse,
144 &ticket_ctx);
145 }
146 #endif
147 #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
148 mbedtls_ssl_conf_extended_master_secret(&conf,
149 (options &
150 0x10) ? MBEDTLS_SSL_EXTENDED_MS_DISABLED : MBEDTLS_SSL_EXTENDED_MS_ENABLED);
151 #endif
152 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
153 mbedtls_ssl_conf_encrypt_then_mac(&conf,
154 (options &
155 0x20) ? MBEDTLS_SSL_ETM_ENABLED : MBEDTLS_SSL_ETM_DISABLED);
156 #endif
157 #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
158 if (options & 0x40) {
159 mbedtls_ssl_conf_psk(&conf, psk, sizeof(psk),
160 (const unsigned char *) psk_id, sizeof(psk_id) - 1);
161 }
162 #endif
163 #if defined(MBEDTLS_SSL_RENEGOTIATION)
164 mbedtls_ssl_conf_renegotiation(&conf,
165 (options &
166 0x80) ? MBEDTLS_SSL_RENEGOTIATION_ENABLED : MBEDTLS_SSL_RENEGOTIATION_DISABLED);
167 #endif
168
169 if (mbedtls_ssl_setup(&ssl, &conf) != 0) {
170 goto exit;
171 }
172
173 biomemfuzz.Data = Data;
174 biomemfuzz.Size = Size-1;
175 biomemfuzz.Offset = 0;
176 mbedtls_ssl_set_bio(&ssl, &biomemfuzz, dummy_send, fuzz_recv, NULL);
177
178 mbedtls_ssl_session_reset(&ssl);
179 ret = mbedtls_ssl_handshake(&ssl);
180 if (ret == 0) {
181 //keep reading data from server until the end
182 do {
183 len = sizeof(buf) - 1;
184 ret = mbedtls_ssl_read(&ssl, buf, len);
185
186 if (ret == MBEDTLS_ERR_SSL_WANT_READ) {
187 continue;
188 } else if (ret <= 0) {
189 //EOF or error
190 break;
191 }
192 } while (1);
193 }
194
195 exit:
196 #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_TICKET_C)
197 mbedtls_ssl_ticket_free(&ticket_ctx);
198 #endif
199 mbedtls_entropy_free(&entropy);
200 mbedtls_ctr_drbg_free(&ctr_drbg);
201 mbedtls_ssl_config_free(&conf);
202 #if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
203 mbedtls_x509_crt_free(&srvcert);
204 mbedtls_pk_free(&pkey);
205 #endif
206 mbedtls_ssl_free(&ssl);
207 #if defined(MBEDTLS_USE_PSA_CRYPTO)
208 mbedtls_psa_crypto_free();
209 #endif
210 #else
211 (void) Data;
212 (void) Size;
213 #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */
214
215 return 0;
216 }
217