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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/ssl/ssl_cipher_suite_names.h"
#include <ostream>
#include "base/notreached.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "net/ssl/ssl_connection_status_flags.h"
#include "third_party/boringssl/src/include/openssl/ssl.h"
namespace net {
namespace {
int ObsoleteSSLStatusForProtocol(int ssl_version) {
int obsolete_ssl = OBSOLETE_SSL_NONE;
if (ssl_version < SSL_CONNECTION_VERSION_TLS1_2)
obsolete_ssl |= OBSOLETE_SSL_MASK_PROTOCOL;
return obsolete_ssl;
}
int ObsoleteSSLStatusForCipherSuite(uint16_t cipher_suite) {
int obsolete_ssl = OBSOLETE_SSL_NONE;
const SSL_CIPHER* cipher = SSL_get_cipher_by_value(cipher_suite);
if (!cipher) {
// Cannot determine/unknown cipher suite. Err on the side of caution.
obsolete_ssl |= OBSOLETE_SSL_MASK_KEY_EXCHANGE;
obsolete_ssl |= OBSOLETE_SSL_MASK_CIPHER;
return obsolete_ssl;
}
if (SSL_CIPHER_get_kx_nid(cipher) == NID_kx_rsa) {
obsolete_ssl |= OBSOLETE_SSL_MASK_KEY_EXCHANGE;
}
if (!SSL_CIPHER_is_aead(cipher)) {
obsolete_ssl |= OBSOLETE_SSL_MASK_CIPHER;
}
return obsolete_ssl;
}
int ObsoleteSSLStatusForSignature(uint16_t signature_algorithm) {
switch (signature_algorithm) {
case SSL_SIGN_ECDSA_SHA1:
case SSL_SIGN_RSA_PKCS1_MD5_SHA1:
case SSL_SIGN_RSA_PKCS1_SHA1:
return OBSOLETE_SSL_MASK_SIGNATURE;
default:
return OBSOLETE_SSL_NONE;
}
}
} // namespace
void SSLCipherSuiteToStrings(const char** key_exchange_str,
const char** cipher_str,
const char** mac_str,
bool* is_aead,
bool* is_tls13,
uint16_t cipher_suite) {
*key_exchange_str = *cipher_str = *mac_str = "???";
*is_aead = false;
*is_tls13 = false;
const SSL_CIPHER* cipher = SSL_get_cipher_by_value(cipher_suite);
if (!cipher)
return;
switch (SSL_CIPHER_get_kx_nid(cipher)) {
case NID_kx_any:
*key_exchange_str = nullptr;
*is_tls13 = true;
break;
case NID_kx_rsa:
*key_exchange_str = "RSA";
break;
case NID_kx_ecdhe:
switch (SSL_CIPHER_get_auth_nid(cipher)) {
case NID_auth_rsa:
*key_exchange_str = "ECDHE_RSA";
break;
case NID_auth_ecdsa:
*key_exchange_str = "ECDHE_ECDSA";
break;
}
break;
}
switch (SSL_CIPHER_get_cipher_nid(cipher)) {
case NID_aes_128_gcm:
*cipher_str = "AES_128_GCM";
break;
case NID_aes_256_gcm:
*cipher_str = "AES_256_GCM";
break;
case NID_chacha20_poly1305:
*cipher_str = "CHACHA20_POLY1305";
break;
case NID_aes_128_cbc:
*cipher_str = "AES_128_CBC";
break;
case NID_aes_256_cbc:
*cipher_str = "AES_256_CBC";
break;
case NID_des_ede3_cbc:
*cipher_str = "3DES_EDE_CBC";
break;
}
if (SSL_CIPHER_is_aead(cipher)) {
*is_aead = true;
*mac_str = nullptr;
} else {
switch (SSL_CIPHER_get_digest_nid(cipher)) {
case NID_sha1:
*mac_str = "HMAC-SHA1";
break;
case NID_sha256:
*mac_str = "HMAC-SHA256";
break;
case NID_sha384:
*mac_str = "HMAC-SHA384";
break;
}
}
}
void SSLVersionToString(const char** name, int ssl_version) {
switch (ssl_version) {
case SSL_CONNECTION_VERSION_SSL2:
*name = "SSL 2.0";
break;
case SSL_CONNECTION_VERSION_SSL3:
*name = "SSL 3.0";
break;
case SSL_CONNECTION_VERSION_TLS1:
*name = "TLS 1.0";
break;
case SSL_CONNECTION_VERSION_TLS1_1:
*name = "TLS 1.1";
break;
case SSL_CONNECTION_VERSION_TLS1_2:
*name = "TLS 1.2";
break;
case SSL_CONNECTION_VERSION_TLS1_3:
*name = "TLS 1.3";
break;
case SSL_CONNECTION_VERSION_QUIC:
*name = "QUIC";
break;
default:
NOTREACHED() << ssl_version;
*name = "???";
break;
}
}
bool ParseSSLCipherString(const std::string& cipher_string,
uint16_t* cipher_suite) {
int value = 0;
if (cipher_string.size() == 6 &&
base::StartsWith(cipher_string, "0x",
base::CompareCase::INSENSITIVE_ASCII) &&
base::HexStringToInt(cipher_string, &value)) {
*cipher_suite = static_cast<uint16_t>(value);
return true;
}
return false;
}
int ObsoleteSSLStatus(int connection_status, uint16_t signature_algorithm) {
int obsolete_ssl = OBSOLETE_SSL_NONE;
int ssl_version = SSLConnectionStatusToVersion(connection_status);
obsolete_ssl |= ObsoleteSSLStatusForProtocol(ssl_version);
uint16_t cipher_suite = SSLConnectionStatusToCipherSuite(connection_status);
obsolete_ssl |= ObsoleteSSLStatusForCipherSuite(cipher_suite);
obsolete_ssl |= ObsoleteSSLStatusForSignature(signature_algorithm);
return obsolete_ssl;
}
bool IsTLSCipherSuiteAllowedByHTTP2(uint16_t cipher_suite) {
return ObsoleteSSLStatusForCipherSuite(cipher_suite) == OBSOLETE_SSL_NONE;
}
} // namespace net
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