142 lines
4.5 KiB
C
142 lines
4.5 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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#include "mbedtls/ssl_cookie.h"
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#ifdef MBEDTLS_SSL_SRV_C
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const char *pers = "fuzz_dtlsserver";
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const unsigned char client_ip[4] = {0x7F, 0, 0, 1};
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static bool initialized = 0;
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#if defined(MBEDTLS_X509_CRT_PARSE_C)
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static mbedtls_x509_crt srvcert;
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static mbedtls_pk_context pkey;
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#endif
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#endif // MBEDTLS_SSL_SRV_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_SRV_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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mbedtls_ssl_cookie_ctx cookie_ctx;
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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)
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mbedtls_x509_crt_init( &srvcert );
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mbedtls_pk_init( &pkey );
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if (mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_srv_crt,
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mbedtls_test_srv_crt_len ) != 0)
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return 1;
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if (mbedtls_x509_crt_parse( &srvcert, (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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if (mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
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mbedtls_test_srv_key_len, NULL, 0 ) != 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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mbedtls_ssl_cookie_init( &cookie_ctx );
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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_SERVER,
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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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srand(1);
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mbedtls_ssl_conf_rng( &conf, dummy_random, &ctr_drbg );
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#if defined(MBEDTLS_X509_CRT_PARSE_C)
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mbedtls_ssl_conf_ca_chain( &conf, srvcert.next, NULL );
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if( mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) != 0 )
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goto exit;
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#endif
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if( mbedtls_ssl_cookie_setup( &cookie_ctx, dummy_random, &ctr_drbg ) != 0 )
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goto exit;
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mbedtls_ssl_conf_dtls_cookies( &conf, mbedtls_ssl_cookie_write, mbedtls_ssl_cookie_check, &cookie_ctx );
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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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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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if( mbedtls_ssl_set_client_transport_id( &ssl, client_ip, sizeof(client_ip) ) != 0 )
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goto exit;
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ret = mbedtls_ssl_handshake( &ssl );
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if (ret == MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED) {
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biomemfuzz.Offset = ssl.next_record_offset;
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mbedtls_ssl_session_reset( &ssl );
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mbedtls_ssl_set_bio( &ssl, &biomemfuzz, dummy_send, fuzz_recv, fuzz_recv_timeout );
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if( mbedtls_ssl_set_client_transport_id( &ssl, client_ip, sizeof(client_ip) ) != 0 )
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goto exit;
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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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}
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exit:
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mbedtls_ssl_cookie_free( &cookie_ctx );
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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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