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/* Copyright (c) 2017-2021, The Tor Project, Inc. */
/* See LICENSE for licensing information */
#define HS_DESCRIPTOR_PRIVATE
#include "core/or/or.h"
#include "trunnel/ed25519_cert.h" /* Trunnel interface. */
#include "lib/crypt_ops/crypto_ed25519.h"
#include "feature/hs/hs_descriptor.h"
#include "feature/dirparse/unparseable.h"
#include "test/fuzz/fuzzing.h"
static void
mock_dump_desc__nodump(const char *desc, const char *type)
{
(void)desc;
(void)type;
}
static int
mock_rsa_ed25519_crosscert_check(const uint8_t *crosscert,
const size_t crosscert_len,
const crypto_pk_t *rsa_id_key,
const ed25519_public_key_t *master_key,
const time_t reject_if_expired_before)
{
(void) crosscert;
(void) crosscert_len;
(void) rsa_id_key;
(void) master_key;
(void) reject_if_expired_before;
return 0;
}
static size_t
mock_decrypt_desc_layer(const hs_descriptor_t *desc,
const uint8_t *descriptor_cookie,
bool is_superencrypted_layer,
char **decrypted_out)
{
(void)is_superencrypted_layer;
(void)desc;
(void)descriptor_cookie;
const size_t overhead = HS_DESC_ENCRYPTED_SALT_LEN + DIGEST256_LEN;
const uint8_t *encrypted_blob = (is_superencrypted_layer)
? desc->plaintext_data.superencrypted_blob
: desc->superencrypted_data.encrypted_blob;
size_t encrypted_blob_size = (is_superencrypted_layer)
? desc->plaintext_data.superencrypted_blob_size
: desc->superencrypted_data.encrypted_blob_size;
if (encrypted_blob_size < overhead)
return 0;
*decrypted_out = tor_memdup_nulterm(
encrypted_blob + HS_DESC_ENCRYPTED_SALT_LEN,
encrypted_blob_size - overhead);
size_t result = strlen(*decrypted_out);
if (result) {
return result;
} else {
tor_free(*decrypted_out);
return 0;
}
}
static const uint8_t *decrypted_data = NULL;
static size_t decrypted_len = 0;
static size_t
mock_desc_decrypt_superencrypted(const hs_descriptor_t *desc,
char **decrypted_out)
{
(void)desc;
*decrypted_out = (char*)tor_memdup_nulterm(decrypted_data, decrypted_len);
return decrypted_len;
}
int
fuzz_init(void)
{
disable_signature_checking();
MOCK(dump_desc, mock_dump_desc__nodump);
MOCK(rsa_ed25519_crosscert_check, mock_rsa_ed25519_crosscert_check);
MOCK(decrypt_desc_layer, mock_decrypt_desc_layer);
MOCK(desc_decrypt_superencrypted, mock_desc_decrypt_superencrypted);
ed25519_init();
return 0;
}
int
fuzz_cleanup(void)
{
return 0;
}
int
fuzz_main(const uint8_t *data, size_t sz)
{
decrypted_data = data;
decrypted_len = sz;
hs_descriptor_t *desc = tor_malloc_zero(sizeof(hs_descriptor_t));
hs_desc_superencrypted_data_t *output = tor_malloc_zero(sizeof(*output));
hs_desc_decode_status_t status;
status = desc_decode_superencrypted_v3(desc, output);
if (status == HS_DESC_DECODE_OK) {
log_debug(LD_GENERAL, "Decoding okay");
} else {
log_debug(LD_GENERAL, "Decoding failed");
}
hs_descriptor_free(desc);
hs_desc_superencrypted_data_free(output);
return 0;
}
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