128 lines
3.5 KiB
C
128 lines
3.5 KiB
C
#define MBEDTLS_ALLOW_PRIVATE_ACCESS
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#include <string.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include "common.h"
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#include "mbedtls/ssl.h"
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#if defined(MBEDTLS_SSL_PROTO_DTLS)
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/timing.h"
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#include "test/certs.h"
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#if defined(MBEDTLS_SSL_CLI_C) && \
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defined(MBEDTLS_ENTROPY_C) && \
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defined(MBEDTLS_CTR_DRBG_C) && \
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defined(MBEDTLS_TIMING_C)
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static int initialized = 0;
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#if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
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static mbedtls_x509_crt cacert;
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#endif
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const char *pers = "fuzz_dtlsclient";
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#endif
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#endif // MBEDTLS_SSL_PROTO_DTLS
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int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
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{
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#if defined(MBEDTLS_SSL_PROTO_DTLS) && \
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defined(MBEDTLS_SSL_CLI_C) && \
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defined(MBEDTLS_ENTROPY_C) && \
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defined(MBEDTLS_CTR_DRBG_C) && \
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defined(MBEDTLS_TIMING_C)
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int ret;
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size_t len;
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mbedtls_ssl_context ssl;
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mbedtls_ssl_config conf;
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mbedtls_ctr_drbg_context ctr_drbg;
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mbedtls_entropy_context entropy;
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mbedtls_timing_delay_context timer;
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unsigned char buf[4096];
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fuzzBufferOffset_t biomemfuzz;
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if (initialized == 0) {
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#if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
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mbedtls_x509_crt_init(&cacert);
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if (mbedtls_x509_crt_parse(&cacert, (const unsigned char *) mbedtls_test_cas_pem,
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mbedtls_test_cas_pem_len) != 0) {
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return 1;
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}
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#endif
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dummy_init();
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initialized = 1;
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}
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mbedtls_ssl_init(&ssl);
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mbedtls_ssl_config_init(&conf);
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mbedtls_ctr_drbg_init(&ctr_drbg);
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mbedtls_entropy_init(&entropy);
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srand(1);
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if (mbedtls_ctr_drbg_seed(&ctr_drbg, dummy_entropy, &entropy,
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(const unsigned char *) pers, strlen(pers)) != 0) {
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goto exit;
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}
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if (mbedtls_ssl_config_defaults(&conf,
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MBEDTLS_SSL_IS_CLIENT,
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MBEDTLS_SSL_TRANSPORT_DATAGRAM,
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MBEDTLS_SSL_PRESET_DEFAULT) != 0) {
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goto exit;
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}
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#if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
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mbedtls_ssl_conf_ca_chain(&conf, &cacert, NULL);
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#endif
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mbedtls_ssl_conf_authmode(&conf, MBEDTLS_SSL_VERIFY_NONE);
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mbedtls_ssl_conf_rng(&conf, dummy_random, &ctr_drbg);
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if (mbedtls_ssl_setup(&ssl, &conf) != 0) {
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goto exit;
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}
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mbedtls_ssl_set_timer_cb(&ssl, &timer, mbedtls_timing_set_delay,
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mbedtls_timing_get_delay);
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#if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
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if (mbedtls_ssl_set_hostname(&ssl, "localhost") != 0) {
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goto exit;
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}
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#endif
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biomemfuzz.Data = Data;
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biomemfuzz.Size = Size;
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biomemfuzz.Offset = 0;
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mbedtls_ssl_set_bio(&ssl, &biomemfuzz, dummy_send, fuzz_recv, fuzz_recv_timeout);
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ret = mbedtls_ssl_handshake(&ssl);
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if (ret == 0) {
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//keep reading data from server until the end
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do {
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len = sizeof(buf) - 1;
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ret = mbedtls_ssl_read(&ssl, buf, len);
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if (ret == MBEDTLS_ERR_SSL_WANT_READ) {
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continue;
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} else if (ret <= 0) {
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//EOF or error
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break;
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}
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} while (1);
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}
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exit:
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mbedtls_entropy_free(&entropy);
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mbedtls_ctr_drbg_free(&ctr_drbg);
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mbedtls_ssl_config_free(&conf);
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mbedtls_ssl_free(&ssl);
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#else
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(void) Data;
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(void) Size;
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#endif
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return 0;
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}
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