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/*
* 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 <cstring>
#include <vector>
#include <mutex>
#include <iostream>
#include <fstream>
#include <openssl/crypto.h>
#include <openssl/conf.h>
#ifdef HAVE_LIBBROTLI
# include <brotli/encode.h>
# include <brotli/decode.h>
#endif // HAVE_LIBBROTLI
#include "ssl_compat.h"
namespace nghttp2 {
namespace tls {
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);
}
int ssl_ctx_set_proto_versions(SSL_CTX *ssl_ctx, int min, int max) {
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;
}
#if defined(NGHTTP2_OPENSSL_IS_BORINGSSL) && defined(HAVE_LIBBROTLI)
int cert_compress(SSL *ssl, CBB *out, const uint8_t *in, size_t in_len) {
uint8_t *dest;
auto compressed_size = BrotliEncoderMaxCompressedSize(in_len);
if (compressed_size == 0) {
return 0;
}
if (!CBB_reserve(out, &dest, compressed_size)) {
return 0;
}
if (BrotliEncoderCompress(BROTLI_MAX_QUALITY, BROTLI_DEFAULT_WINDOW,
BROTLI_MODE_GENERIC, in_len, in, &compressed_size,
dest) != BROTLI_TRUE) {
return 0;
}
if (!CBB_did_write(out, compressed_size)) {
return 0;
}
return 1;
}
int cert_decompress(SSL *ssl, CRYPTO_BUFFER **out, size_t uncompressed_len,
const uint8_t *in, size_t in_len) {
uint8_t *dest;
auto buf = CRYPTO_BUFFER_alloc(&dest, uncompressed_len);
auto len = uncompressed_len;
if (BrotliDecoderDecompress(in_len, in, &len, dest) !=
BROTLI_DECODER_RESULT_SUCCESS) {
CRYPTO_BUFFER_free(buf);
return 0;
}
if (uncompressed_len != len) {
CRYPTO_BUFFER_free(buf);
return 0;
}
*out = buf;
return 1;
}
#endif // NGHTTP2_OPENSSL_IS_BORINGSSL && HAVE_LIBBROTLI
namespace {
std::ofstream keylog_file;
void keylog_callback(const SSL *ssl, const char *line) {
keylog_file.write(line, strlen(line));
keylog_file.put('\n');
keylog_file.flush();
}
} // namespace
int setup_keylog_callback(SSL_CTX *ssl_ctx) {
auto keylog_filename = getenv("SSLKEYLOGFILE");
if (!keylog_filename) {
return 0;
}
keylog_file.open(keylog_filename, std::ios_base::app);
if (!keylog_file) {
return -1;
}
SSL_CTX_set_keylog_callback(ssl_ctx, keylog_callback);
return 0;
}
} // namespace tls
} // namespace nghttp2
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