1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2014 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "tls.h"
#include <cassert>
#include <vector>
#include <mutex>
#include <iostream>
#include <openssl/crypto.h>
#include <openssl/conf.h>
#include "ssl_compat.h"
namespace nghttp2 {
namespace tls {
#if OPENSSL_1_1_API
// CRYPTO_LOCK is deprecated as of OpenSSL 1.1.0
LibsslGlobalLock::LibsslGlobalLock() {}
#else // !OPENSSL_1_1_API
namespace {
std::mutex *ssl_global_locks;
} // namespace
namespace {
void ssl_locking_cb(int mode, int type, const char *file, int line) {
if (mode & CRYPTO_LOCK) {
ssl_global_locks[type].lock();
} else {
ssl_global_locks[type].unlock();
}
}
} // namespace
LibsslGlobalLock::LibsslGlobalLock() {
if (ssl_global_locks) {
std::cerr << "OpenSSL global lock has been already set" << std::endl;
assert(0);
}
ssl_global_locks = new std::mutex[CRYPTO_num_locks()];
// CRYPTO_set_id_callback(ssl_thread_id); OpenSSL manual says that
// if threadid_func is not specified using
// CRYPTO_THREADID_set_callback(), then default implementation is
// used. We use this default one.
CRYPTO_set_locking_callback(ssl_locking_cb);
}
#endif // !OPENSSL_1_1_API
const char *get_tls_protocol(SSL *ssl) {
switch (SSL_version(ssl)) {
case SSL2_VERSION:
return "SSLv2";
case SSL3_VERSION:
return "SSLv3";
#ifdef TLS1_3_VERSION
case TLS1_3_VERSION:
return "TLSv1.3";
#endif // TLS1_3_VERSION
case TLS1_2_VERSION:
return "TLSv1.2";
case TLS1_1_VERSION:
return "TLSv1.1";
case TLS1_VERSION:
return "TLSv1";
default:
return "unknown";
}
}
TLSSessionInfo *get_tls_session_info(TLSSessionInfo *tls_info, SSL *ssl) {
if (!ssl) {
return nullptr;
}
auto session = SSL_get_session(ssl);
if (!session) {
return nullptr;
}
tls_info->cipher = SSL_get_cipher_name(ssl);
tls_info->protocol = get_tls_protocol(ssl);
tls_info->session_reused = SSL_session_reused(ssl);
unsigned int session_id_length;
tls_info->session_id = SSL_SESSION_get_id(session, &session_id_length);
tls_info->session_id_length = session_id_length;
return tls_info;
}
/* Conditional logic w/ lookup tables to check if id is one of the
the block listed cipher suites for HTTP/2 described in RFC 7540.
https://github.com/jay/http2_blacklisted_ciphers
*/
#define IS_CIPHER_BANNED_METHOD2(id) \
((0x0000 <= id && id <= 0x00FF && \
"\xFF\xFF\xFF\xCF\xFF\xFF\xFF\xFF\x7F\x00\x00\x00\x80\x3F\x00\x00" \
"\xF0\xFF\xFF\x3F\xF3\xF3\xFF\xFF\x3F\x00\x00\x00\x00\x00\x00\x80" \
[(id & 0xFF) / 8] & \
(1 << (id % 8))) || \
(0xC000 <= id && id <= 0xC0FF && \
"\xFE\xFF\xFF\xFF\xFF\x67\xFE\xFF\xFF\xFF\x33\xCF\xFC\xCF\xFF\xCF" \
"\x3C\xF3\xFC\x3F\x33\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" \
[(id & 0xFF) / 8] & \
(1 << (id % 8))))
bool check_http2_cipher_block_list(SSL *ssl) {
int id = SSL_CIPHER_get_id(SSL_get_current_cipher(ssl)) & 0xFFFFFF;
return IS_CIPHER_BANNED_METHOD2(id);
}
bool check_http2_tls_version(SSL *ssl) {
auto tls_ver = SSL_version(ssl);
return tls_ver >= TLS1_2_VERSION;
}
bool check_http2_requirement(SSL *ssl) {
return check_http2_tls_version(ssl) && !check_http2_cipher_block_list(ssl);
}
void libssl_init() {
#if OPENSSL_1_1_API
// No explicit initialization is required.
#elif defined(OPENSSL_IS_BORINGSSL)
CRYPTO_library_init();
#else // !OPENSSL_1_1_API && !defined(OPENSSL_IS_BORINGSSL)
OPENSSL_config(nullptr);
SSL_load_error_strings();
SSL_library_init();
OpenSSL_add_all_algorithms();
#endif // !OPENSSL_1_1_API && !defined(OPENSSL_IS_BORINGSSL)
}
int ssl_ctx_set_proto_versions(SSL_CTX *ssl_ctx, int min, int max) {
#if OPENSSL_1_1_API || defined(OPENSSL_IS_BORINGSSL)
if (SSL_CTX_set_min_proto_version(ssl_ctx, min) != 1 ||
SSL_CTX_set_max_proto_version(ssl_ctx, max) != 1) {
return -1;
}
return 0;
#else // !OPENSSL_1_1_API && !defined(OPENSSL_IS_BORINGSSL)
long int opts = 0;
// TODO We depends on the ordering of protocol version macro in
// OpenSSL.
if (min > TLS1_VERSION) {
opts |= SSL_OP_NO_TLSv1;
}
if (min > TLS1_1_VERSION) {
opts |= SSL_OP_NO_TLSv1_1;
}
if (min > TLS1_2_VERSION) {
opts |= SSL_OP_NO_TLSv1_2;
}
if (max < TLS1_2_VERSION) {
opts |= SSL_OP_NO_TLSv1_2;
}
if (max < TLS1_1_VERSION) {
opts |= SSL_OP_NO_TLSv1_1;
}
SSL_CTX_set_options(ssl_ctx, opts);
return 0;
#endif // !OPENSSL_1_1_API && !defined(OPENSSL_IS_BORINGSSL)
}
} // namespace tls
} // namespace nghttp2
|
