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
dont_log(gpr_log_func_args * args)42 static void dont_log(gpr_log_func_args* args) {}
43
44 // Add a random number of target service accounts to client options.
read_target_service_accounts(input_stream * inp,grpc_alts_credentials_options * 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
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)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 }
121