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/*
* Copyright 2016-2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* https://www.openssl.org/source/license.html
* or in the file LICENSE in the source distribution.
*/
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/bio.h>
#include "fuzzer.h"
#include "internal/sockets.h"
#include "internal/time.h"
#include "internal/quic_ssl.h"
/* unused, to avoid warning. */
static int idx;
static OSSL_TIME fake_now;
static OSSL_TIME fake_now_cb(void *arg)
{
return fake_now;
}
int FuzzerInitialize(int *argc, char ***argv)
{
STACK_OF(SSL_COMP) *comp_methods;
FuzzerSetRand();
OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS | OPENSSL_INIT_ASYNC, NULL);
OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL);
ERR_clear_error();
CRYPTO_free_ex_index(0, -1);
idx = SSL_get_ex_data_X509_STORE_CTX_idx();
comp_methods = SSL_COMP_get_compression_methods();
if (comp_methods != NULL)
sk_SSL_COMP_sort(comp_methods);
return 1;
}
int FuzzerTestOneInput(const uint8_t *buf, size_t len)
{
SSL *client = NULL;
BIO *in;
BIO *out;
SSL_CTX *ctx;
BIO_ADDR *peer_addr = NULL;
struct in_addr ina = {0};
struct timeval tv;
if (len == 0)
return 0;
/* This only fuzzes the initial flow from the client so far. */
ctx = SSL_CTX_new(OSSL_QUIC_client_method());
if (ctx == NULL)
goto end;
client = SSL_new(ctx);
if (client == NULL)
goto end;
fake_now = ossl_ms2time(1);
if (!ossl_quic_conn_set_override_now_cb(client, fake_now_cb, NULL))
goto end;
peer_addr = BIO_ADDR_new();
if (peer_addr == NULL)
goto end;
ina.s_addr = htonl(0x7f000001UL);
if (!BIO_ADDR_rawmake(peer_addr, AF_INET, &ina, sizeof(ina), htons(4433)))
goto end;
SSL_set_tlsext_host_name(client, "localhost");
in = BIO_new(BIO_s_dgram_mem());
if (in == NULL)
goto end;
out = BIO_new(BIO_s_dgram_mem());
if (out == NULL) {
BIO_free(in);
goto end;
}
if (!BIO_dgram_set_caps(out, BIO_DGRAM_CAP_HANDLES_DST_ADDR)) {
BIO_free(in);
BIO_free(out);
goto end;
}
SSL_set_bio(client, in, out);
if (SSL_set_alpn_protos(client, (const unsigned char *)"\x08ossltest", 9) != 0)
goto end;
if (SSL_set1_initial_peer_addr(client, peer_addr) != 1)
goto end;
SSL_set_connect_state(client);
for (;;) {
size_t size;
uint64_t nxtpktms = 0;
OSSL_TIME nxtpkt = ossl_time_zero(), nxttimeout;
int isinf, ret;
if (len >= 2) {
nxtpktms = buf[0] + (buf[1] << 8);
nxtpkt = ossl_time_add(fake_now, ossl_ms2time(nxtpktms));
len -= 2;
buf += 2;
}
for (;;) {
if ((ret = SSL_do_handshake(client)) == 1) {
/*
* Keep reading application data until there are no more
* datagrams to inject or a fatal error occurs
*/
uint8_t tmp[1024];
ret = SSL_read(client, tmp, sizeof(tmp));
}
if (ret <= 0) {
switch (SSL_get_error(client, ret)) {
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
break;
default:
goto end;
}
}
if (!SSL_get_event_timeout(client, &tv, &isinf))
goto end;
if (isinf) {
fake_now = nxtpkt;
break;
} else {
nxttimeout = ossl_time_add(fake_now,
ossl_time_from_timeval(tv));
if (len > 3 && ossl_time_compare(nxttimeout, nxtpkt) >= 0) {
fake_now = nxtpkt;
break;
}
fake_now = nxttimeout;
}
}
if (len <= 3)
break;
size = buf[0] + (buf[1] << 8);
if (size > len - 2)
break;
if (size > 0)
BIO_write(in, buf+2, size);
len -= size + 2;
buf += size + 2;
}
end:
SSL_free(client);
ERR_clear_error();
SSL_CTX_free(ctx);
BIO_ADDR_free(peer_addr);
return 0;
}
void FuzzerCleanup(void)
{
FuzzerClearRand();
}
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