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Add a fuzzer for the http used in our directory protocol
(Teor wrote the code, nick extracted it. It won't compile yet.)
This commit is contained in:
teor
Nick Mathewson
parent
b96c70d668
commit
a967d568dc
174
src/test/fuzz/fuzz_http.c
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174
src/test/fuzz/fuzz_http.c
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/* Copyright (c) 2016, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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#include "orconfig.h"
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#define BUFFERS_PRIVATE
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#include "or.h"
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#include "backtrace.h"
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#include "buffers.h"
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#include "config.h"
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#include "connection.h"
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#include "directory.h"
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#include "torlog.h"
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/* Silence compiler warnings about a missing extern */
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extern const char tor_git_revision[];
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const char tor_git_revision[] = "";
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#define MAX_FUZZ_SIZE (2*MAX_HEADERS_SIZE + MAX_DIR_UL_SIZE)
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static int mock_get_options_calls = 0;
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static or_options_t *mock_options = NULL;
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static void
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reset_options(or_options_t *options, int *get_options_calls)
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{
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memset(options, 0, sizeof(or_options_t));
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options->TestingTorNetwork = 1;
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*get_options_calls = 0;
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}
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static const or_options_t*
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mock_get_options(void)
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{
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++mock_get_options_calls;
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tor_assert(mock_options);
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return mock_options;
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}
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static void
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mock_connection_write_to_buf_impl_(const char *string, size_t len,
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connection_t *conn, int zlib)
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{
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log_debug(LD_GENERAL, "%sResponse:\n%zu\nConnection: %p\n%s\n",
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zlib ? "Compressed " : "", len, conn, string);
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}
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/* Read a directory command (including HTTP headers) from stdin, parse it, and
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* output what tor parsed */
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int
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main(int c, char** v)
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{
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/* Disable logging by default to speed up fuzzing. */
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int loglevel = LOG_ERR;
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/* Initialise logging first */
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init_logging(1);
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configure_backtrace_handler(get_version());
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for (int i = 1; i < c; ++i) {
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if (!strcmp(v[i], "--warn")) {
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loglevel = LOG_WARN;
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} else if (!strcmp(v[i], "--notice")) {
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loglevel = LOG_NOTICE;
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} else if (!strcmp(v[i], "--info")) {
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loglevel = LOG_INFO;
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} else if (!strcmp(v[i], "--debug")) {
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loglevel = LOG_DEBUG;
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}
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}
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{
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log_severity_list_t s;
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memset(&s, 0, sizeof(s));
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set_log_severity_config(loglevel, LOG_ERR, &s);
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/* ALWAYS log bug warnings. */
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s.masks[LOG_WARN-LOG_ERR] |= LD_BUG;
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add_stream_log(&s, "", fileno(stdout));
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}
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/* Make BUG() and nonfatal asserts crash */
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tor_set_failed_assertion_callback(abort);
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/* Set up fake variables */
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dir_connection_t dir_conn;
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int rv = -1;
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ssize_t data_size = -1;
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char *stdin_buf = tor_malloc(MAX_FUZZ_SIZE+1);
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/* directory_handle_command checks some tor options
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* just make them all 0 */
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mock_options = tor_malloc(sizeof(or_options_t));
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reset_options(mock_options, &mock_get_options_calls);
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MOCK(get_options, mock_get_options);
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/* Set up the fake connection */
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memset(&dir_conn, 0, sizeof(dir_connection_t));
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dir_conn.base_.type = CONN_TYPE_DIR;
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/* Set up fake response handler */
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MOCK(connection_write_to_buf_impl_, mock_connection_write_to_buf_impl_);
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/*
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afl extension - loop and reset state after parsing
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likely needs to reset the allocation data structures and counts as well
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#ifdef __AFL_HAVE_MANUAL_CONTROL
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while (__AFL_LOOP(1000)) {
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#endif
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*/
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/* Initialise the data structures */
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memset(stdin_buf, 0, MAX_FUZZ_SIZE+1);
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/* Apparently tor sets this before directory_handle_command() is called. */
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dir_conn.base_.address = tor_strdup("replace-this-address.example.com");
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#ifdef __AFL_HAVE_MANUAL_CONTROL
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/* Tell AFL to pause and fork here - ignored if not using AFL */
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__AFL_INIT();
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#endif
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/* Read the data */
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data_size = read(STDIN_FILENO, stdin_buf, MAX_FUZZ_SIZE);
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tor_assert(data_size != -1);
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tor_assert(data_size <= MAX_FUZZ_SIZE);
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stdin_buf[data_size] = '\0';
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tor_assert(strlen(stdin_buf) >= 0);
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tor_assert(strlen(stdin_buf) <= MAX_FUZZ_SIZE);
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log_debug(LD_GENERAL, "Input-Length:\n%zu\n", data_size);
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log_debug(LD_GENERAL, "Input:\n%s\n", stdin_buf);
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/* Copy the stdin data into the buffer */
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tor_assert(data_size >= 0);
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dir_conn.base_.inbuf = buf_new_with_data(stdin_buf, (size_t)data_size);
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if (!dir_conn.base_.inbuf) {
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log_debug(LD_GENERAL, "Zero-Length-Input\n");
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return 0;
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}
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/* Parse the headers */
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rv = directory_handle_command(&dir_conn);
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/* TODO: check the output is correctly parsed based on the input */
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/* Report the parsed origin address */
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if (dir_conn.base_.address) {
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log_debug(LD_GENERAL, "Address:\n%s\n", dir_conn.base_.address);
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}
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log_debug(LD_GENERAL, "Result:\n%d\n", rv);
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/* Reset */
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tor_free(dir_conn.base_.address);
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buf_free(dir_conn.base_.inbuf);
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dir_conn.base_.inbuf = NULL;
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/*
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#ifdef __AFL_HAVE_MANUAL_CONTROL
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}
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#endif
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*/
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/* Cleanup */
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tor_free(mock_options);
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UNMOCK(get_options);
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UNMOCK(connection_write_to_buf_impl_);
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tor_free(stdin_buf);
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}
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