nghttp2/src/ssl.cc

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/*
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* nghttp2 - HTTP/2 C Library
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*
* 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 "ssl.h"
#include <cassert>
#include <vector>
#include <mutex>
#include <iostream>
#include <openssl/crypto.h>
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#include <openssl/conf.h>
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namespace nghttp2 {
namespace ssl {
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// Recommended general purpose "Intermediate compatibility" cipher
// suites by mozilla.
//
// https://wiki.mozilla.org/Security/Server_Side_TLS
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const char *const DEFAULT_CIPHER_LIST =
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"ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-"
"AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-"
"SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-"
"AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-"
"ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-"
"AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-"
"SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-"
"ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-"
"SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-"
"SHA:DES-CBC3-SHA:!DSS";
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namespace {
std::vector<std::mutex> ssl_global_locks;
} // namespace
namespace {
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void ssl_locking_cb(int mode, int type, const char *file, int line) {
if (mode & CRYPTO_LOCK) {
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ssl_global_locks[type].lock();
} else {
ssl_global_locks[type].unlock();
}
}
} // namespace
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LibsslGlobalLock::LibsslGlobalLock() {
if (!ssl_global_locks.empty()) {
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std::cerr << "OpenSSL global lock has been already set" << std::endl;
assert(0);
}
ssl_global_locks = std::vector<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);
}
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LibsslGlobalLock::~LibsslGlobalLock() { ssl_global_locks.clear(); }
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const char *get_tls_protocol(SSL *ssl) {
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switch (SSL_version(ssl)) {
case SSL2_VERSION:
return "SSLv2";
case SSL3_VERSION:
return "SSLv3";
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);
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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 black 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_black_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_black_list(ssl);
}
void libssl_init() {
#ifndef OPENSSL_IS_BORINGSSL
OPENSSL_config(nullptr);
#endif // OPENSSL_IS_BORINGSSL
SSL_load_error_strings();
SSL_library_init();
OpenSSL_add_all_algorithms();
}
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} // namespace ssl
} // namespace nghttp2