1 /*
2 * Copyright (c) Facebook, Inc. and its affiliates.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <folly/io/async/test/SSLUtil.h>
18
19 #include <algorithm>
20 #include <set>
21
22 namespace {
23
24 std::set<std::string> const suitesFor13{
25 "TLS_AES_256_GCM_SHA384",
26 "TLS_CHACHA20_POLY1305_SHA256",
27 "TLS_AES_128_GCM_SHA256",
28 "TLS_AES_128_CCM_8_SHA256",
29 "TLS_AES_128_CCM_SHA256",
30 };
31
32 } // namespace
33
34 namespace folly {
35 namespace test {
36
getCiphersFromSSL(SSL * s)37 std::vector<std::string> getCiphersFromSSL(SSL* s) {
38 std::vector<std::string> osslCiphers;
39 for (int i = 0;; i++) {
40 auto c = SSL_get_cipher_list(s, i);
41 if (c == nullptr) {
42 break;
43 }
44 osslCiphers.emplace_back(std::move(c));
45 }
46
47 return osslCiphers;
48 }
49
getNonTLS13CipherList(SSL * s)50 std::vector<std::string> getNonTLS13CipherList(SSL* s) {
51 // OpenSSL 1.1.1 added TLS 1.3 support; SSL_get_cipher_list will return
52 // TLS 1.3 ciphersuites, even if they are not explicitly added by
53 // SSL_CTX_set_cipher_list (This is to ensure that applications built against
54 // 1.1.0 which did not have TLS 1.3 support would still be able to
55 // transparently begin negotiating TLS 1.3).
56 //
57 // For the time being, filter out any TLS 1.3 ciphers that appear in the
58 // returned list. A more accurate test would be to determine at runtime
59 // if TLS 1.3 support is available, and assert that the TLS 1.3 ciphersuites
60 // are added regardless of what we put in SSL_CTX_set_cipher_list
61
62 auto ciphers = getCiphersFromSSL(s);
63 ciphers.erase(
64 std::remove_if(
65 begin(ciphers),
66 end(ciphers),
67 [](const std::string& cipher) {
68 return suitesFor13.count(cipher) > 0;
69 }),
70 end(ciphers));
71 return ciphers;
72 }
73
getTLS13Ciphersuites(SSL * s)74 std::vector<std::string> getTLS13Ciphersuites(SSL* s) {
75 auto ciphers = getCiphersFromSSL(s);
76 ciphers.erase(
77 std::remove_if(
78 begin(ciphers),
79 end(ciphers),
80 [](const std::string& cipher) {
81 return suitesFor13.count(cipher) == 0;
82 }),
83 end(ciphers));
84 return ciphers;
85 }
86
87 } // namespace test
88 } // namespace folly
89