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
27 #include "src/core/lib/gprpp/crash.h"
28 #include "src/core/lib/gprpp/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 #include "test/core/util/fuzzer_util.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 *)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 if (squelch && !grpc_core::GetEnv("GRPC_TRACE_FUZZER").has_value()) {
65 gpr_set_log_function(dont_log);
66 }
67 input_stream inp = {data, data + size};
68 grpc_init();
69 bool is_on_gcp = grpc_alts_is_running_on_gcp();
70 while (inp.cur != inp.end) {
71 bool enable_untrusted_alts = grpc_fuzzer_get_next_byte(&inp) & 0x01;
72 char* handshaker_service_url =
73 grpc_fuzzer_get_next_byte(&inp) & 0x01
74 ? grpc_fuzzer_get_next_string(&inp, nullptr)
75 : nullptr;
76 if (grpc_fuzzer_get_next_byte(&inp) & 0x01) {
77 // Test ALTS channel credentials.
78 grpc_alts_credentials_options* options =
79 grpc_alts_credentials_client_options_create();
80 read_target_service_accounts(&inp, options);
81 grpc_channel_credentials* cred = grpc_alts_credentials_create_customized(
82 options, handshaker_service_url, enable_untrusted_alts);
83 if (!enable_untrusted_alts && !is_on_gcp) {
84 GPR_ASSERT(cred == nullptr);
85 } else {
86 GPR_ASSERT(cred != nullptr);
87 }
88 grpc_channel_credentials_release(cred);
89 grpc_alts_credentials_options_destroy(options);
90 } else {
91 // Test ALTS server credentials.
92 grpc_alts_credentials_options* options =
93 grpc_alts_credentials_server_options_create();
94 grpc_server_credentials* cred =
95 grpc_alts_server_credentials_create_customized(
96 options, handshaker_service_url, enable_untrusted_alts);
97 if (!enable_untrusted_alts && !is_on_gcp) {
98 GPR_ASSERT(cred == nullptr);
99 } else {
100 GPR_ASSERT(cred != nullptr);
101 }
102 grpc_server_credentials_release(cred);
103 grpc_alts_credentials_options_destroy(options);
104 }
105 gpr_free(handshaker_service_url);
106 }
107 grpc_shutdown();
108 return 0;
109 }
110