216 lines
6.8 KiB
C
216 lines
6.8 KiB
C
#include "mbedtls/ssl.h"
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/ssl_ticket.h"
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#include "test/certs.h"
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#include "common.h"
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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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#if defined(MBEDTLS_SSL_SRV_C) && \
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defined(MBEDTLS_ENTROPY_C) && \
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defined(MBEDTLS_CTR_DRBG_C)
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const char *pers = "fuzz_server";
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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 srvcert;
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static mbedtls_pk_context pkey;
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#endif
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const char *alpn_list[3];
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#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
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const unsigned char psk[] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f
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};
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const char psk_id[] = "Client_identity";
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#endif
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#endif // MBEDTLS_SSL_SRV_C && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C
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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_SRV_C) && \
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defined(MBEDTLS_ENTROPY_C) && \
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defined(MBEDTLS_CTR_DRBG_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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#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_TICKET_C)
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mbedtls_ssl_ticket_context ticket_ctx;
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#endif
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unsigned char buf[4096];
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fuzzBufferOffset_t biomemfuzz;
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uint8_t options;
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//we take 1 byte as options input
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if (Size < 1) {
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return 0;
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}
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options = Data[Size - 1];
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mbedtls_ctr_drbg_init(&ctr_drbg);
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mbedtls_entropy_init(&entropy);
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#if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
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mbedtls_x509_crt_init(&srvcert);
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mbedtls_pk_init(&pkey);
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#endif
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mbedtls_ssl_init(&ssl);
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mbedtls_ssl_config_init(&conf);
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#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_TICKET_C)
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mbedtls_ssl_ticket_init(&ticket_ctx);
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#endif
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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psa_status_t status = psa_crypto_init();
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if (status != PSA_SUCCESS) {
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goto exit;
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}
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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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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return 1;
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}
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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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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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}
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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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}
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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,
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dummy_random, &ctr_drbg) != 0) {
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return 1;
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}
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#endif
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alpn_list[0] = "HTTP";
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alpn_list[1] = "fuzzalpn";
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alpn_list[2] = NULL;
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dummy_init();
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initialized = 1;
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}
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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_STREAM,
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MBEDTLS_SSL_PRESET_DEFAULT) != 0) {
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goto exit;
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}
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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) && defined(MBEDTLS_PEM_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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}
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#endif
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mbedtls_ssl_conf_cert_req_ca_list(&conf,
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(options &
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0x1) ? MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED : MBEDTLS_SSL_CERT_REQ_CA_LIST_DISABLED);
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#if defined(MBEDTLS_SSL_ALPN)
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if (options & 0x2) {
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mbedtls_ssl_conf_alpn_protocols(&conf, alpn_list);
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}
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#endif
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#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_TICKET_C)
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if (options & 0x4) {
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if (mbedtls_ssl_ticket_setup(&ticket_ctx,
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dummy_random, &ctr_drbg,
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MBEDTLS_CIPHER_AES_256_GCM,
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86400) != 0) {
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goto exit;
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}
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mbedtls_ssl_conf_session_tickets_cb(&conf,
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mbedtls_ssl_ticket_write,
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mbedtls_ssl_ticket_parse,
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&ticket_ctx);
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}
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#endif
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#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
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mbedtls_ssl_conf_extended_master_secret(&conf,
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(options &
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0x10) ? MBEDTLS_SSL_EXTENDED_MS_DISABLED : MBEDTLS_SSL_EXTENDED_MS_ENABLED);
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#endif
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#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
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mbedtls_ssl_conf_encrypt_then_mac(&conf,
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(options &
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0x20) ? MBEDTLS_SSL_ETM_ENABLED : MBEDTLS_SSL_ETM_DISABLED);
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#endif
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#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
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if (options & 0x40) {
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mbedtls_ssl_conf_psk(&conf, psk, sizeof(psk),
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(const unsigned char *) psk_id, sizeof(psk_id) - 1);
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}
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#endif
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#if defined(MBEDTLS_SSL_RENEGOTIATION)
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mbedtls_ssl_conf_renegotiation(&conf,
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(options &
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0x80) ? MBEDTLS_SSL_RENEGOTIATION_ENABLED : MBEDTLS_SSL_RENEGOTIATION_DISABLED);
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#endif
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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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biomemfuzz.Data = Data;
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biomemfuzz.Size = Size-1;
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biomemfuzz.Offset = 0;
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mbedtls_ssl_set_bio(&ssl, &biomemfuzz, dummy_send, fuzz_recv, NULL);
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mbedtls_ssl_session_reset(&ssl);
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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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#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_TICKET_C)
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mbedtls_ssl_ticket_free(&ticket_ctx);
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#endif
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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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#if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
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mbedtls_x509_crt_free(&srvcert);
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mbedtls_pk_free(&pkey);
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#endif
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mbedtls_ssl_free(&ssl);
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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mbedtls_psa_crypto_free();
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#endif
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#else
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(void) Data;
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(void) Size;
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#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */
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return 0;
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}
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