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/*
* Copyright (c) 2019 Yubico AB. All rights reserved.
* Use of this source code is governed by a BSD-style
* license that can be found in the LICENSE file.
*/
#include <assert.h>
#include <cbor.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "fido.h"
#include "mutator_aux.h"
size_t LLVMFuzzerMutate(uint8_t *, size_t, size_t);
static const uint8_t *wire_data_ptr = NULL;
static size_t wire_data_len = 0;
size_t
xstrlen(const char *s)
{
if (s == NULL)
return 0;
return strlen(s);
}
void
consume(const void *body, size_t len)
{
const volatile uint8_t *ptr = body;
volatile uint8_t x = 0;
#ifdef WITH_MSAN
__msan_check_mem_is_initialized(body, len);
#endif
while (len--)
x ^= *ptr++;
}
void
consume_str(const char *str)
{
consume(str, strlen(str));
}
int
unpack_int(cbor_item_t *item, int *v)
{
if (cbor_is_int(item) == false ||
cbor_int_get_width(item) != CBOR_INT_64)
return -1;
if (cbor_isa_uint(item))
*v = (int)cbor_get_uint64(item);
else
*v = (int)(-cbor_get_uint64(item) - 1);
return 0;
}
int
unpack_string(cbor_item_t *item, char *v)
{
size_t len;
if (cbor_isa_bytestring(item) == false ||
(len = cbor_bytestring_length(item)) >= MAXSTR)
return -1;
memcpy(v, cbor_bytestring_handle(item), len);
v[len] = '\0';
return 0;
}
int
unpack_byte(cbor_item_t *item, uint8_t *v)
{
if (cbor_isa_uint(item) == false ||
cbor_int_get_width(item) != CBOR_INT_8)
return -1;
*v = cbor_get_uint8(item);
return 0;
}
int
unpack_blob(cbor_item_t *item, struct blob *v)
{
if (cbor_isa_bytestring(item) == false ||
(v->len = cbor_bytestring_length(item)) > sizeof(v->body))
return -1;
memcpy(v->body, cbor_bytestring_handle(item), v->len);
return 0;
}
cbor_item_t *
pack_int(int v) NO_MSAN
{
if (v < 0)
return cbor_build_negint64((uint64_t)(-(int64_t)v - 1));
else
return cbor_build_uint64((uint64_t)v);
}
cbor_item_t *
pack_string(const char *v) NO_MSAN
{
if (strlen(v) >= MAXSTR)
return NULL;
return cbor_build_bytestring((const unsigned char *)v, strlen(v));
}
cbor_item_t *
pack_byte(uint8_t v) NO_MSAN
{
return cbor_build_uint8(v);
}
cbor_item_t *
pack_blob(const struct blob *v) NO_MSAN
{
return cbor_build_bytestring(v->body, v->len);
}
void
mutate_byte(uint8_t *b)
{
LLVMFuzzerMutate(b, sizeof(*b), sizeof(*b));
}
void
mutate_int(int *i)
{
LLVMFuzzerMutate((uint8_t *)i, sizeof(*i), sizeof(*i));
}
void
mutate_blob(struct blob *blob)
{
blob->len = LLVMFuzzerMutate((uint8_t *)blob->body, blob->len,
sizeof(blob->body));
}
void
mutate_string(char *s)
{
size_t n;
n = LLVMFuzzerMutate((uint8_t *)s, strlen(s), MAXSTR - 1);
s[n] = '\0';
}
void *
dev_open(const char *path)
{
(void)path;
return (void *)0xdeadbeef;
}
void
dev_close(void *handle)
{
assert(handle == (void *)0xdeadbeef);
}
int
dev_read(void *handle, unsigned char *ptr, size_t len, int ms)
{
size_t n;
(void)ms;
assert(handle == (void *)0xdeadbeef);
assert(len >= CTAP_MIN_REPORT_LEN && len <= CTAP_MAX_REPORT_LEN);
if (wire_data_len < len)
n = wire_data_len;
else
n = len;
memcpy(ptr, wire_data_ptr, n);
wire_data_ptr += n;
wire_data_len -= n;
return (int)n;
}
int
dev_write(void *handle, const unsigned char *ptr, size_t len)
{
assert(handle == (void *)0xdeadbeef);
assert(len >= CTAP_MIN_REPORT_LEN + 1 &&
len <= CTAP_MAX_REPORT_LEN + 1);
consume(ptr, len);
if (uniform_random(400) < 1)
return -1;
return (int)len;
}
void
set_wire_data(const uint8_t *ptr, size_t len)
{
wire_data_ptr = ptr;
wire_data_len = len;
}
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