test/core/security/alts_credentials_fuzzer.cc

   1 /*
   2  *
   3  * Copyright 2018 gRPC authors.
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  *
  17  */
  18
  19 #include <string.h>
  20
  21 #include <grpc/grpc.h>
  22 #include <grpc/grpc_security.h>
  23 #include <grpc/support/alloc.h>
  24 #include <grpc/support/log.h>
  25 #include <grpc/support/string_util.h>
  26 #include "test/core/util/fuzzer_util.h"
  27
  28 #include "src/core/lib/gpr/env.h"
  29 #include "src/core/lib/security/credentials/alts/alts_credentials.h"
  30 #include "src/core/lib/security/credentials/alts/check_gcp_environment.h"
  31 #include "src/core/lib/security/credentials/alts/grpc_alts_credentials_options.h"
  32
  33 using grpc_core::testing::grpc_fuzzer_get_next_byte;
  34 using grpc_core::testing::grpc_fuzzer_get_next_string;
  35 using grpc_core::testing::input_stream;
  36
  37 // Logging
  38 bool squelch = true;
  39 bool leak_check = true;
  40
  41 static void dont_log(gpr_log_func_args* /*args*/) {}
  42
  43 // Add a random number of target service accounts to client options.
  44 static void read_target_service_accounts(
  45     input_stream* inp, grpc_alts_credentials_options* options) {
  46   size_t n = grpc_fuzzer_get_next_byte(inp);
  47   for (size_t i = 0; i < n; i++) {
  48     char* service_account = grpc_fuzzer_get_next_string(inp, nullptr);
  49     if (service_account != nullptr) {
  50       grpc_alts_credentials_client_options_add_target_service_account(
  51           options, service_account);
  52       gpr_free(service_account);
  53     }
  54   }
  55   // Added to improve code coverage.
  56   grpc_alts_credentials_client_options_add_target_service_account(options,
  57                                                                   nullptr);
  58   grpc_alts_credentials_client_options_add_target_service_account(
  59       nullptr, "this is service account");
  60 }
  61
  62 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
  63   char* grpc_trace_fuzzer = gpr_getenv("GRPC_TRACE_FUZZER");
  64   if (squelch && grpc_trace_fuzzer == nullptr) {
  65     gpr_set_log_function(dont_log);
  66   }
  67   gpr_free(grpc_trace_fuzzer);
  68   input_stream inp = {data, data + size};
  69   grpc_init();
  70   bool is_on_gcp = grpc_alts_is_running_on_gcp();
  71   while (inp.cur != inp.end) {
  72     bool enable_untrusted_alts = grpc_fuzzer_get_next_byte(&inp) & 0x01;
  73     char* handshaker_service_url =
  74         grpc_fuzzer_get_next_byte(&inp) & 0x01
  75             ? grpc_fuzzer_get_next_string(&inp, nullptr)
  76             : nullptr;
  77     if (grpc_fuzzer_get_next_byte(&inp) & 0x01) {
  78       // Test ALTS channel credentials.
  79       grpc_alts_credentials_options* options =
  80           grpc_alts_credentials_client_options_create();
  81       read_target_service_accounts(&inp, options);
  82       grpc_channel_credentials* cred = grpc_alts_credentials_create_customized(
  83           options, handshaker_service_url, enable_untrusted_alts);
  84       if (!enable_untrusted_alts && !is_on_gcp) {
  85         GPR_ASSERT(cred == nullptr);
  86       } else {
  87         GPR_ASSERT(cred != nullptr);
  88       }
  89       grpc_channel_credentials_release(cred);
  90       grpc_alts_credentials_options_destroy(options);
  91     } else {
  92       // Test ALTS server credentials.
  93       grpc_alts_credentials_options* options =
  94           grpc_alts_credentials_server_options_create();
  95       grpc_server_credentials* cred =
  96           grpc_alts_server_credentials_create_customized(
  97               options, handshaker_service_url, enable_untrusted_alts);
  98       if (!enable_untrusted_alts && !is_on_gcp) {
  99         GPR_ASSERT(cred == nullptr);
 100       } else {
 101         GPR_ASSERT(cred != nullptr);
 102       }
 103       grpc_server_credentials_release(cred);
 104       grpc_alts_credentials_options_destroy(options);
 105     }
 106     gpr_free(handshaker_service_url);
 107   }
 108   grpc_shutdown();
 109   return 0;
 110 }