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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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433 lines
12 KiB
433 lines
12 KiB
8 years ago
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/* Fuzz testing for the nanopb core.
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* Attempts to verify all the properties defined in the security model document.
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*/
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#include <pb_decode.h>
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#include <pb_encode.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <time.h>
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#include <malloc_wrappers.h>
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#include "alltypes_static.pb.h"
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#include "alltypes_pointer.pb.h"
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static uint64_t random_seed;
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/* Uses xorshift64 here instead of rand() for both speed and
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* reproducibility across platforms. */
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static uint32_t rand_word()
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{
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random_seed ^= random_seed >> 12;
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random_seed ^= random_seed << 25;
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random_seed ^= random_seed >> 27;
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return random_seed * 2685821657736338717ULL;
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}
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/* Get a random integer in range, with approximately flat distribution. */
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static int rand_int(int min, int max)
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{
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return rand_word() % (max + 1 - min) + min;
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}
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static bool rand_bool()
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{
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return rand_word() & 1;
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}
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/* Get a random byte, with skewed distribution.
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* Important corner cases like 0xFF, 0x00 and 0xFE occur more
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* often than other values. */
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static uint8_t rand_byte()
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{
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uint32_t w = rand_word();
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uint8_t b = w & 0xFF;
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if (w & 0x100000)
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b >>= (w >> 8) & 7;
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if (w & 0x200000)
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b <<= (w >> 12) & 7;
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if (w & 0x400000)
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b ^= 0xFF;
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return b;
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}
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/* Get a random length, with skewed distribution.
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* Favors the shorter lengths, but always atleast 1. */
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static size_t rand_len(size_t max)
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{
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uint32_t w = rand_word();
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size_t s;
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if (w & 0x800000)
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w &= 3;
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else if (w & 0x400000)
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w &= 15;
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else if (w & 0x200000)
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w &= 255;
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s = (w % max);
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if (s == 0)
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s = 1;
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return s;
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}
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/* Fills a buffer with random data with skewed distribution. */
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static void rand_fill(uint8_t *buf, size_t count)
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{
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while (count--)
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*buf++ = rand_byte();
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}
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/* Fill with random protobuf-like data */
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static size_t rand_fill_protobuf(uint8_t *buf, size_t min_bytes, size_t max_bytes, int min_tag)
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{
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pb_ostream_t stream = pb_ostream_from_buffer(buf, max_bytes);
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while(stream.bytes_written < min_bytes)
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{
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pb_wire_type_t wt = rand_int(0, 3);
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if (wt == 3) wt = 5; /* Gap in values */
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if (!pb_encode_tag(&stream, wt, rand_int(min_tag, min_tag + 512)))
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break;
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if (wt == PB_WT_VARINT)
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{
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uint64_t value;
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rand_fill((uint8_t*)&value, sizeof(value));
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pb_encode_varint(&stream, value);
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}
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else if (wt == PB_WT_64BIT)
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{
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uint64_t value;
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rand_fill((uint8_t*)&value, sizeof(value));
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pb_encode_fixed64(&stream, &value);
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}
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else if (wt == PB_WT_32BIT)
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{
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uint32_t value;
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rand_fill((uint8_t*)&value, sizeof(value));
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pb_encode_fixed32(&stream, &value);
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}
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else if (wt == PB_WT_STRING)
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{
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size_t len;
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uint8_t *buf;
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if (min_bytes > stream.bytes_written)
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len = rand_len(min_bytes - stream.bytes_written);
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else
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len = 0;
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buf = malloc(len);
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pb_encode_varint(&stream, len);
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rand_fill(buf, len);
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pb_write(&stream, buf, len);
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free(buf);
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}
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}
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return stream.bytes_written;
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}
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/* Given a buffer of data, mess it up a bit */
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static void rand_mess(uint8_t *buf, size_t count)
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{
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int m = rand_int(0, 3);
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if (m == 0)
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{
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/* Replace random substring */
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int s = rand_int(0, count - 1);
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int l = rand_len(count - s);
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rand_fill(buf + s, l);
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}
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else if (m == 1)
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{
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/* Swap random bytes */
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int a = rand_int(0, count - 1);
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int b = rand_int(0, count - 1);
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int x = buf[a];
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buf[a] = buf[b];
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buf[b] = x;
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}
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else if (m == 2)
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{
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/* Duplicate substring */
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int s = rand_int(0, count - 2);
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int l = rand_len((count - s) / 2);
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memcpy(buf + s + l, buf + s, l);
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}
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else if (m == 3)
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{
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/* Add random protobuf noise */
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int s = rand_int(0, count - 1);
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int l = rand_len(count - s);
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rand_fill_protobuf(buf + s, l, count - s, 1);
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}
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}
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/* Some default data to put in the message */
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static const alltypes_static_AllTypes initval = alltypes_static_AllTypes_init_default;
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#define BUFSIZE 4096
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static bool do_static_encode(uint8_t *buffer, size_t *msglen)
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{
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pb_ostream_t stream;
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bool status;
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/* Allocate a message and fill it with defaults */
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alltypes_static_AllTypes *msg = malloc_with_check(sizeof(alltypes_static_AllTypes));
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memcpy(msg, &initval, sizeof(initval));
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/* Apply randomness to the data before encoding */
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while (rand_int(0, 7))
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rand_mess((uint8_t*)msg, sizeof(alltypes_static_AllTypes));
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stream = pb_ostream_from_buffer(buffer, BUFSIZE);
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status = pb_encode(&stream, alltypes_static_AllTypes_fields, msg);
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assert(stream.bytes_written <= BUFSIZE);
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assert(stream.bytes_written <= alltypes_static_AllTypes_size);
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*msglen = stream.bytes_written;
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8 years ago
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pb_release(alltypes_static_AllTypes_fields, msg);
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8 years ago
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free_with_check(msg);
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return status;
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}
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/* Append or prepend protobuf noise */
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static void do_protobuf_noise(uint8_t *buffer, size_t *msglen)
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{
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int m = rand_int(0, 2);
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size_t max_size = BUFSIZE - 32 - *msglen;
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if (m == 1)
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{
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/* Prepend */
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uint8_t *tmp = malloc_with_check(BUFSIZE);
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size_t s = rand_fill_protobuf(tmp, rand_len(max_size), BUFSIZE - *msglen, 512);
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memmove(buffer + s, buffer, *msglen);
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memcpy(buffer, tmp, s);
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free_with_check(tmp);
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*msglen += s;
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}
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else if (m == 2)
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{
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/* Append */
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size_t s = rand_fill_protobuf(buffer + *msglen, rand_len(max_size), BUFSIZE - *msglen, 512);
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*msglen += s;
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}
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}
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static bool do_static_decode(uint8_t *buffer, size_t msglen, bool assert_success)
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{
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pb_istream_t stream;
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bool status;
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alltypes_static_AllTypes *msg = malloc_with_check(sizeof(alltypes_static_AllTypes));
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rand_fill((uint8_t*)msg, sizeof(alltypes_static_AllTypes));
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stream = pb_istream_from_buffer(buffer, msglen);
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status = pb_decode(&stream, alltypes_static_AllTypes_fields, msg);
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if (!status && assert_success)
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{
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/* Anything that was successfully encoded, should be decodeable.
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* One exception: strings without null terminator are encoded up
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* to end of buffer, but refused on decode because the terminator
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* would not fit. */
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if (strcmp(stream.errmsg, "string overflow") != 0)
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assert(status);
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}
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free_with_check(msg);
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return status;
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}
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static bool do_pointer_decode(uint8_t *buffer, size_t msglen, bool assert_success)
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{
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pb_istream_t stream;
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bool status;
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alltypes_pointer_AllTypes *msg;
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msg = malloc_with_check(sizeof(alltypes_pointer_AllTypes));
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memset(msg, 0, sizeof(alltypes_pointer_AllTypes));
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stream = pb_istream_from_buffer(buffer, msglen);
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assert(get_alloc_count() == 0);
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status = pb_decode(&stream, alltypes_pointer_AllTypes_fields, msg);
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if (assert_success)
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assert(status);
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pb_release(alltypes_pointer_AllTypes_fields, msg);
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assert(get_alloc_count() == 0);
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free_with_check(msg);
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return status;
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}
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/* Do a decode -> encode -> decode -> encode roundtrip */
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static void do_static_roundtrip(uint8_t *buffer, size_t msglen)
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{
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bool status;
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uint8_t *buf2 = malloc_with_check(BUFSIZE);
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uint8_t *buf3 = malloc_with_check(BUFSIZE);
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size_t msglen2, msglen3;
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alltypes_static_AllTypes *msg1 = malloc_with_check(sizeof(alltypes_static_AllTypes));
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alltypes_static_AllTypes *msg2 = malloc_with_check(sizeof(alltypes_static_AllTypes));
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memset(msg1, 0, sizeof(alltypes_static_AllTypes));
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memset(msg2, 0, sizeof(alltypes_static_AllTypes));
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{
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pb_istream_t stream = pb_istream_from_buffer(buffer, msglen);
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status = pb_decode(&stream, alltypes_static_AllTypes_fields, msg1);
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assert(status);
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}
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{
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pb_ostream_t stream = pb_ostream_from_buffer(buf2, BUFSIZE);
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status = pb_encode(&stream, alltypes_static_AllTypes_fields, msg1);
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assert(status);
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msglen2 = stream.bytes_written;
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}
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{
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pb_istream_t stream = pb_istream_from_buffer(buf2, msglen2);
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status = pb_decode(&stream, alltypes_static_AllTypes_fields, msg2);
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assert(status);
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}
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{
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pb_ostream_t stream = pb_ostream_from_buffer(buf3, BUFSIZE);
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status = pb_encode(&stream, alltypes_static_AllTypes_fields, msg2);
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assert(status);
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msglen3 = stream.bytes_written;
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}
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assert(msglen2 == msglen3);
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assert(memcmp(buf2, buf3, msglen2) == 0);
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free_with_check(msg1);
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free_with_check(msg2);
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free_with_check(buf2);
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free_with_check(buf3);
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}
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/* Do decode -> encode -> decode -> encode roundtrip */
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static void do_pointer_roundtrip(uint8_t *buffer, size_t msglen)
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{
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bool status;
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uint8_t *buf2 = malloc_with_check(BUFSIZE);
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uint8_t *buf3 = malloc_with_check(BUFSIZE);
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size_t msglen2, msglen3;
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alltypes_pointer_AllTypes *msg1 = malloc_with_check(sizeof(alltypes_pointer_AllTypes));
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alltypes_pointer_AllTypes *msg2 = malloc_with_check(sizeof(alltypes_pointer_AllTypes));
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memset(msg1, 0, sizeof(alltypes_pointer_AllTypes));
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memset(msg2, 0, sizeof(alltypes_pointer_AllTypes));
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{
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pb_istream_t stream = pb_istream_from_buffer(buffer, msglen);
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status = pb_decode(&stream, alltypes_pointer_AllTypes_fields, msg1);
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assert(status);
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}
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{
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pb_ostream_t stream = pb_ostream_from_buffer(buf2, BUFSIZE);
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status = pb_encode(&stream, alltypes_pointer_AllTypes_fields, msg1);
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assert(status);
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msglen2 = stream.bytes_written;
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}
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{
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pb_istream_t stream = pb_istream_from_buffer(buf2, msglen2);
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status = pb_decode(&stream, alltypes_pointer_AllTypes_fields, msg2);
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assert(status);
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}
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{
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pb_ostream_t stream = pb_ostream_from_buffer(buf3, BUFSIZE);
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status = pb_encode(&stream, alltypes_pointer_AllTypes_fields, msg2);
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assert(status);
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msglen3 = stream.bytes_written;
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}
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assert(msglen2 == msglen3);
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assert(memcmp(buf2, buf3, msglen2) == 0);
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pb_release(alltypes_pointer_AllTypes_fields, msg1);
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pb_release(alltypes_pointer_AllTypes_fields, msg2);
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free_with_check(msg1);
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free_with_check(msg2);
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free_with_check(buf2);
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free_with_check(buf3);
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}
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static void run_iteration()
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{
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uint8_t *buffer = malloc_with_check(BUFSIZE);
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size_t msglen;
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bool status;
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rand_fill(buffer, BUFSIZE);
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if (do_static_encode(buffer, &msglen))
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{
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do_protobuf_noise(buffer, &msglen);
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status = do_static_decode(buffer, msglen, true);
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if (status)
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do_static_roundtrip(buffer, msglen);
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status = do_pointer_decode(buffer, msglen, true);
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if (status)
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do_pointer_roundtrip(buffer, msglen);
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/* Apply randomness to the encoded data */
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while (rand_bool())
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rand_mess(buffer, BUFSIZE);
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/* Apply randomness to encoded data length */
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if (rand_bool())
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msglen = rand_int(0, BUFSIZE);
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status = do_static_decode(buffer, msglen, false);
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do_pointer_decode(buffer, msglen, status);
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if (status)
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{
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do_static_roundtrip(buffer, msglen);
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do_pointer_roundtrip(buffer, msglen);
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}
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}
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free_with_check(buffer);
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}
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int main(int argc, char **argv)
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{
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int i;
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if (argc > 1)
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{
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random_seed = atol(argv[1]);
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}
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else
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{
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random_seed = time(NULL);
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}
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fprintf(stderr, "Random seed: %llu\n", (long long unsigned)random_seed);
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for (i = 0; i < 10000; i++)
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{
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run_iteration();
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}
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return 0;
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}
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