| #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/certs.h" |
| #include "mbedtls/timing.h" |
| #include "mbedtls/ssl_cookie.h" |
| |
| |
| #ifdef MBEDTLS_SSL_SRV_C |
| const char *pers = "fuzz_dtlsserver"; |
| const unsigned char client_ip[4] = {0x7F, 0, 0, 1}; |
| static int initialized = 0; |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C) |
| static mbedtls_x509_crt srvcert; |
| static mbedtls_pk_context pkey; |
| #endif |
| #endif // MBEDTLS_SSL_SRV_C |
| #endif // MBEDTLS_SSL_PROTO_DTLS |
| |
| int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) && defined(MBEDTLS_SSL_SRV_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; |
| mbedtls_ssl_cookie_ctx cookie_ctx; |
| 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( &srvcert ); |
| mbedtls_pk_init( &pkey ); |
| if (mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_srv_crt, |
| mbedtls_test_srv_crt_len ) != 0) |
| return 1; |
| if (mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_cas_pem, |
| mbedtls_test_cas_pem_len ) != 0) |
| return 1; |
| if (mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key, |
| mbedtls_test_srv_key_len, NULL, 0 ) != 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 ); |
| mbedtls_ssl_cookie_init( &cookie_ctx ); |
| |
| 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_DATAGRAM, |
| MBEDTLS_SSL_PRESET_DEFAULT ) != 0 ) |
| goto exit; |
| |
| |
| srand(1); |
| mbedtls_ssl_conf_rng( &conf, dummy_random, &ctr_drbg ); |
| |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C) |
| mbedtls_ssl_conf_ca_chain( &conf, srvcert.next, NULL ); |
| if( mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) != 0 ) |
| goto exit; |
| #endif |
| |
| if( mbedtls_ssl_cookie_setup( &cookie_ctx, dummy_random, &ctr_drbg ) != 0 ) |
| goto exit; |
| |
| mbedtls_ssl_conf_dtls_cookies( &conf, mbedtls_ssl_cookie_write, mbedtls_ssl_cookie_check, &cookie_ctx ); |
| |
| if( mbedtls_ssl_setup( &ssl, &conf ) != 0 ) |
| goto exit; |
| |
| mbedtls_ssl_set_timer_cb( &ssl, &timer, mbedtls_timing_set_delay, |
| mbedtls_timing_get_delay ); |
| |
| biomemfuzz.Data = Data; |
| biomemfuzz.Size = Size; |
| biomemfuzz.Offset = 0; |
| mbedtls_ssl_set_bio( &ssl, &biomemfuzz, dummy_send, fuzz_recv, fuzz_recv_timeout ); |
| if( mbedtls_ssl_set_client_transport_id( &ssl, client_ip, sizeof(client_ip) ) != 0 ) |
| goto exit; |
| |
| ret = mbedtls_ssl_handshake( &ssl ); |
| |
| if (ret == MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED) { |
| biomemfuzz.Offset = ssl.next_record_offset; |
| mbedtls_ssl_session_reset( &ssl ); |
| mbedtls_ssl_set_bio( &ssl, &biomemfuzz, dummy_send, fuzz_recv, fuzz_recv_timeout ); |
| if( mbedtls_ssl_set_client_transport_id( &ssl, client_ip, sizeof(client_ip) ) != 0 ) |
| goto exit; |
| |
| 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_ssl_cookie_free( &cookie_ctx ); |
| 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; |
| } |