projects/apache-httpd/fuzz_utils.c

/* Copyright 2021 Google LLC
Licensed under the Apache License, Version 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
      http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include "apr.h"
#include "apr_file_io.h"
#include "apr_poll.h"
#include "apr_portable.h"
#include "apr_proc_mutex.h"
#include "apr_signal.h"
#include "apr_strings.h"
#include "apr_thread_mutex.h"
#include "apr_thread_proc.h"

#define APR_WANT_STRFUNC
#include "apr_file_io.h"
#include "apr_fnmatch.h"
#include "apr_want.h"

#include "apr_poll.h"
#include "apr_want.h"

#include "ap_config.h"
#include "ap_expr.h"
#include "ap_listen.h"
#include "ap_provider.h"
#include "ap_regex.h"

#include "ada_fuzz_header.h"


int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
  // Initialize fuzzing garbage collector. We use this to easily
  // get data types seeded with random input from the fuzzer.
  af_gb_init();

  const uint8_t *data2 = data;
  size_t size2 = size;

  char *new_str = af_gb_get_null_terminated(&data2, &size2);
  char *new_dst = af_gb_get_null_terminated(&data2, &size2);
  if (new_str != NULL && new_dst != NULL) {

    // Targets that do not require a pool
    ap_cstr_casecmp(new_str, new_str);
    ap_getparents(new_str);
    ap_unescape_url(new_str);
    ap_unescape_urlencoded(new_str);
    ap_strcmp_match(new_str, new_dst);

    char *ns3 = af_gb_get_null_terminated(&data2, &size2);
    if (ns3 != NULL) {
      ap_no2slash(ns3);
    }

    char *ns11 = af_gb_get_null_terminated(&data2, &size2);
    if (ns11) {
      char *ns10 = malloc(strlen(ns11)*3+1); // big enough for worst-case URL-escaped input.
      ap_escape_path_segment_buffer(ns10, ns11);
      free(ns10);
    }

    // Pool initialisation
    if (apr_pool_initialize() == APR_SUCCESS) {
      apr_pool_t *pool = NULL;
      apr_pool_create(&pool, NULL);

      // Targets that require a pool
      ns3 = af_gb_get_null_terminated(&data2, &size2);
      if (ns3 != NULL) {
        ap_make_dirstr_parent(pool, ns3);
      }

      ap_field_noparam(pool, new_str);

      ap_escape_shell_cmd(pool, new_str);
      ap_os_escape_path(pool, new_str, 0);
      ap_escape_html2(pool, new_str, 0);
      ap_escape_logitem(pool, new_str);

      // This line causes some issues if something bad is allocated
      ap_escape_quotes(pool, new_str);

      if (size > 2) {
        ap_cstr_casecmpn(new_str, new_str + 2, size - 2);
      }

      char *d = malloc(size * 2);
      ap_escape_errorlog_item(d, new_str, size * 2);
      free(d);

      // base64
      char *decoded = NULL;
      decoded = ap_pbase64decode(pool, new_str);
      ap_pbase64encode(pool, new_str);

      char *ns12 = af_gb_get_null_terminated(&data2, &size2);
      if (ns12 != NULL) {
        char *d;
        apr_size_t dlen;
        ap_pbase64decode_strict(pool, ns12, &d, &dlen);
      }

      char *tmp_s = new_str;
      ap_getword_conf2(pool, &tmp_s);

      // str functions
      ap_strcasecmp_match(tmp_s, new_dst);
      ap_strcasestr(tmp_s, new_dst);

      // List functions
      tmp_s = new_str;
      ap_get_list_item(pool, &tmp_s);
      tmp_s = new_str;
      ap_find_list_item(pool, &tmp_s, "kjahsdfkj");
      ap_find_token(pool, tmp_s, "klsjdfk");
      ap_find_last_token(pool, tmp_s, "sdadf");
      ap_is_chunked(pool, tmp_s);

      apr_array_header_t *offers = NULL;
      ap_parse_token_list_strict(pool, new_str, &offers, 0);

      char *tmp_null = NULL;
      ap_pstr2_alnum(pool, new_str, &tmp_null);

      // Word functions
      tmp_s = new_str;
      ap_getword(pool, &tmp_s, 0);

      tmp_s = new_str;
      ap_getword_white_nc(pool, &tmp_s);

      tmp_s = new_str;
      ap_get_token(pool, &tmp_s, 1);

      tmp_s = new_str;
      ap_escape_urlencoded(pool, tmp_s);

      apr_interval_time_t timeout;
      ap_timeout_parameter_parse(new_str, &timeout, "ms");

      tmp_s = new_str;
      ap_content_type_tolower(tmp_s);


			char filename[256];
			sprintf(filename, "/tmp/libfuzzer.%d", getpid());
			FILE *fp = fopen(filename, "wb");
			fwrite(data, size, 1, fp);
			fclose(fp);

			// Fuzzer logic here
			ap_configfile_t *cfg;
			ap_pcfg_openfile(&cfg, pool, filename);
      char tmp_line[100];
      if ((af_get_short(&data2, &size2) % 2) == 0) {
        ap_cfg_getline(tmp_line, 100, cfg);
      }
      else {
        cfg->getstr = NULL;
        ap_cfg_getline(tmp_line, 100, cfg);
      }
			// Fuzzer logic end

			unlink(filename);

      // Cleanup
      apr_pool_terminate();
    }
  }

  // Cleanup all of the memory allocated by the fuzz headers.
  af_gb_cleanup();
  return 0;
}