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
dont_log(gpr_log_func_args *)41 static void dont_log(gpr_log_func_args* /*args*/) {}
42
43 // Add a random number of target service accounts to client options.
read_target_service_accounts(input_stream * inp,grpc_alts_credentials_options * 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
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)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 }
111