117 lines
3.3 KiB
C
117 lines
3.3 KiB
C
#include <string.h>
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#include <stdlib.h>
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#include <stdbool.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/certs.h"
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#include "mbedtls/timing.h"
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#ifdef MBEDTLS_SSL_CLI_C
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static bool 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 // MBEDTLS_SSL_CLI_C
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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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#if defined(MBEDTLS_SSL_PROTO_DTLS) && defined(MBEDTLS_SSL_CLI_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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#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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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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#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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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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#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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{
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//keep reading data from server until the end
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do
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{
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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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