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 #include "test/core/util/memory_counters.h"
  28
  29 #include "src/core/lib/gpr/env.h"
  30 #include "src/core/lib/security/credentials/alts/alts_credentials.h"
  31 #include "src/core/lib/security/credentials/alts/check_gcp_environment.h"
  32 #include "src/core/lib/security/credentials/alts/grpc_alts_credentials_options.h"
  33
  34 using grpc_core::testing::grpc_fuzzer_get_next_byte;
  35 using grpc_core::testing::grpc_fuzzer_get_next_string;
  36 using grpc_core::testing::input_stream;
  37
  38 // Logging
  39 bool squelch = true;
  40 bool leak_check = true;
  41
  42 static void dont_log(gpr_log_func_args* args) {}
  43
  44 // Add a random number of target service accounts to client options.
  45 static void read_target_service_accounts(
  46     input_stream* inp, grpc_alts_credentials_options* options) {
  47   size_t n = grpc_fuzzer_get_next_byte(inp);
  48   for (size_t i = 0; i < n; i++) {
  49     char* service_account = grpc_fuzzer_get_next_string(inp, nullptr);
  50     if (service_account != nullptr) {
  51       grpc_alts_credentials_client_options_add_target_service_account(
  52           options, service_account);
  53       gpr_free(service_account);
  54     }
  55   }
  56   // Added to improve code coverage.
  57   grpc_alts_credentials_client_options_add_target_service_account(options,
  58                                                                   nullptr);
  59   grpc_alts_credentials_client_options_add_target_service_account(
  60       nullptr, "this is service account");
  61 }
  62
  63 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
  64   char* grpc_trace_fuzzer = gpr_getenv("GRPC_TRACE_FUZZER");
  65   if (squelch && grpc_trace_fuzzer == nullptr) {
  66     gpr_set_log_function(dont_log);
  67   }
  68   gpr_free(grpc_trace_fuzzer);
  69   struct grpc_memory_counters counters;
  70   if (leak_check) {
  71     grpc_memory_counters_init();
  72   }
  73   input_stream inp = {data, data + size};
  74   grpc_init();
  75   bool is_on_gcp = grpc_alts_is_running_on_gcp();
  76   while (inp.cur != inp.end) {
  77     bool enable_untrusted_alts = grpc_fuzzer_get_next_byte(&inp) & 0x01;
  78     char* handshaker_service_url =
  79         grpc_fuzzer_get_next_byte(&inp) & 0x01
  80             ? grpc_fuzzer_get_next_string(&inp, nullptr)
  81             : nullptr;
  82     if (grpc_fuzzer_get_next_byte(&inp) & 0x01) {
  83       // Test ALTS channel credentials.
  84       grpc_alts_credentials_options* options =
  85           grpc_alts_credentials_client_options_create();
  86       read_target_service_accounts(&inp, options);
  87       grpc_channel_credentials* cred = grpc_alts_credentials_create_customized(
  88           options, handshaker_service_url, enable_untrusted_alts);
  89       if (!enable_untrusted_alts && !is_on_gcp) {
  90         GPR_ASSERT(cred == nullptr);
  91       } else {
  92         GPR_ASSERT(cred != nullptr);
  93       }
  94       grpc_channel_credentials_release(cred);
  95       grpc_alts_credentials_options_destroy(options);
  96     } else {
  97       // Test ALTS server credentials.
  98       grpc_alts_credentials_options* options =
  99           grpc_alts_credentials_server_options_create();
 100       grpc_server_credentials* cred =
 101           grpc_alts_server_credentials_create_customized(
 102               options, handshaker_service_url, enable_untrusted_alts);
 103       if (!enable_untrusted_alts && !is_on_gcp) {
 104         GPR_ASSERT(cred == nullptr);
 105       } else {
 106         GPR_ASSERT(cred != nullptr);
 107       }
 108       grpc_server_credentials_release(cred);
 109       grpc_alts_credentials_options_destroy(options);
 110     }
 111     gpr_free(handshaker_service_url);
 112   }
 113   grpc_shutdown();
 114   if (leak_check) {
 115     counters = grpc_memory_counters_snapshot();
 116     grpc_memory_counters_destroy();
 117     GPR_ASSERT(counters.total_size_relative == 0);
 118   }
 119   return 0;
 120 }