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/*
* Copyright 2004 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "rtc_base/ssl_stream_adapter.h"
#include <cstddef>
#include <cstdint>
#include <memory>
#include <optional>
#include <set>
#include <string>
#include <utility>
#include <vector>
#include "absl/functional/any_invocable.h"
#include "absl/strings/string_view.h"
#include "api/array_view.h"
#include "api/field_trials_view.h"
#include "rtc_base/openssl_stream_adapter.h"
#include "rtc_base/ssl_identity.h"
#include "rtc_base/stream.h"
namespace webrtc {
// Deprecated, prefer SrtpCryptoSuiteToName.
const char kCsAesCm128HmacSha1_80[] = "AES_CM_128_HMAC_SHA1_80";
const char kCsAesCm128HmacSha1_32[] = "AES_CM_128_HMAC_SHA1_32";
const char kCsAeadAes128Gcm[] = "AEAD_AES_128_GCM";
const char kCsAeadAes256Gcm[] = "AEAD_AES_256_GCM";
std::string SrtpCryptoSuiteToName(int crypto_suite) {
switch (crypto_suite) {
case kSrtpAes128CmSha1_80:
return "AES_CM_128_HMAC_SHA1_80";
case kSrtpAes128CmSha1_32:
return "AES_CM_128_HMAC_SHA1_32";
case kSrtpAeadAes128Gcm:
return "AEAD_AES_128_GCM";
case kSrtpAeadAes256Gcm:
return "AEAD_AES_256_GCM";
default:
return std::string();
}
}
bool GetSrtpKeyAndSaltLengths(int crypto_suite,
int* key_length,
int* salt_length) {
switch (crypto_suite) {
case kSrtpAes128CmSha1_32:
case kSrtpAes128CmSha1_80:
// SRTP_AES128_CM_HMAC_SHA1_32 and SRTP_AES128_CM_HMAC_SHA1_80 are defined
// in RFC 5764 to use a 128 bits key and 112 bits salt for the cipher.
*key_length = 16;
*salt_length = 14;
break;
case kSrtpAeadAes128Gcm:
// kSrtpAeadAes128Gcm is defined in RFC 7714 to use a 128 bits key and
// a 96 bits salt for the cipher.
*key_length = 16;
*salt_length = 12;
break;
case kSrtpAeadAes256Gcm:
// kSrtpAeadAes256Gcm is defined in RFC 7714 to use a 256 bits key and
// a 96 bits salt for the cipher.
*key_length = 32;
*salt_length = 12;
break;
default:
return false;
}
return true;
}
bool IsGcmCryptoSuite(int crypto_suite) {
return (crypto_suite == kSrtpAeadAes256Gcm ||
crypto_suite == kSrtpAeadAes128Gcm);
}
std::unique_ptr<SSLStreamAdapter> SSLStreamAdapter::Create(
std::unique_ptr<StreamInterface> stream,
absl::AnyInvocable<void(SSLHandshakeError)> handshake_error,
const FieldTrialsView* field_trials) {
return std::make_unique<OpenSSLStreamAdapter>(
std::move(stream), std::move(handshake_error), field_trials);
}
bool SSLStreamAdapter::IsBoringSsl() {
return OpenSSLStreamAdapter::IsBoringSsl();
}
bool SSLStreamAdapter::IsAcceptableCipher(int cipher, KeyType key_type) {
return OpenSSLStreamAdapter::IsAcceptableCipher(cipher, key_type);
}
bool SSLStreamAdapter::IsAcceptableCipher(absl::string_view cipher,
KeyType key_type) {
return OpenSSLStreamAdapter::IsAcceptableCipher(cipher, key_type);
}
std::optional<std::string>
SSLStreamAdapter::GetEphemeralKeyExchangeCipherGroupName(uint16_t group_id) {
#if defined(OPENSSL_IS_BORINGSSL)
auto val = SSL_get_group_name(group_id);
if (val != nullptr) {
return std::string(val);
}
#endif
return std::nullopt;
}
std::set<uint16_t>
SSLStreamAdapter::GetSupportedEphemeralKeyExchangeCipherGroups() {
return {
// It would be nice if BoringSSL had a function like this!
#ifdef SSL_GROUP_SECP224R1
SSL_GROUP_SECP224R1,
#endif
#ifdef SSL_GROUP_SECP256R1
SSL_GROUP_SECP256R1,
#endif
#ifdef SSL_GROUP_SECP384R1
SSL_GROUP_SECP384R1,
#endif
#ifdef SSL_GROUP_SECP521R1
SSL_GROUP_SECP521R1,
#endif
#ifdef SSL_GROUP_X25519
SSL_GROUP_X25519,
#endif
#ifdef SSL_GROUP_X25519_MLKEM768
SSL_GROUP_X25519_MLKEM768,
#endif
};
}
std::vector<uint16_t>
SSLStreamAdapter::GetDefaultEphemeralKeyExchangeCipherGroups(
const FieldTrialsView* field_trials) {
// It would be nice if BoringSSL had a function like this!
// from boringssl/src/ssl/extensions.cc kDefaultGroups.
if (field_trials && field_trials->IsEnabled("WebRTC-EnableDtlsPqc")) {
return {
#ifdef SSL_GROUP_X25519_MLKEM768
SSL_GROUP_X25519_MLKEM768,
#endif
#ifdef SSL_GROUP_X25519
SSL_GROUP_X25519,
#endif
#ifdef SSL_GROUP_SECP256R1
SSL_GROUP_SECP256R1,
#endif
#ifdef SSL_GROUP_SECP384R1
SSL_GROUP_SECP384R1,
#endif
};
}
return {
#ifdef SSL_GROUP_X25519
SSL_GROUP_X25519,
#endif
#ifdef SSL_GROUP_SECP256R1
SSL_GROUP_SECP256R1,
#endif
#ifdef SSL_GROUP_SECP384R1
SSL_GROUP_SECP384R1,
#endif
};
}
// Default shim for backward compat.
bool SSLStreamAdapter::SetPeerCertificateDigest(
absl::string_view digest_alg,
const unsigned char* digest_val,
size_t digest_len,
SSLPeerCertificateDigestError* error) {
unsigned char* nonconst_val = const_cast<unsigned char*>(digest_val);
SSLPeerCertificateDigestError ret = SetPeerCertificateDigest(
digest_alg, ArrayView<uint8_t>(nonconst_val, digest_len));
if (error)
*error = ret;
return ret == SSLPeerCertificateDigestError::NONE;
}
///////////////////////////////////////////////////////////////////////////////
// Test only settings
///////////////////////////////////////////////////////////////////////////////
void SSLStreamAdapter::EnableTimeCallbackForTesting() {
OpenSSLStreamAdapter::EnableTimeCallbackForTesting();
}
SSLProtocolVersion SSLStreamAdapter::GetMaxSupportedDTLSProtocolVersion() {
return OpenSSLStreamAdapter::GetMaxSupportedDTLSProtocolVersion();
}
///////////////////////////////////////////////////////////////////////////////
} // namespace webrtc
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