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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 <stddef.h>
#include <stdint.h>
#include <memory>
#include <string>
#include <vector>
#include "rtc_base/async_socket.h"
#include "rtc_base/buffer.h"
#include "rtc_base/message_handler.h"
#include "rtc_base/openssl_identity.h"
#include "rtc_base/openssl_session_cache.h"
#include "rtc_base/socket.h"
#include "rtc_base/socket_address.h"
#include "rtc_base/ssl_adapter.h"
#include "rtc_base/ssl_certificate.h"
#include "rtc_base/ssl_identity.h"
#include "rtc_base/ssl_stream_adapter.h"
namespace rtc {
class OpenSSLAdapter final : public SSLAdapter,
public MessageHandlerAutoCleanup {
static bool InitializeSSL();
static bool CleanupSSL();
// Creating an OpenSSLAdapter requires a socket to bind to, an optional
// session cache if you wish to improve performance by caching sessions for
// hostnames you have previously connected to and an optional
// SSLCertificateVerifier which can override any existing trusted roots to
// validate a peer certificate. The cache and verifier are effectively
// immutable after the the SSL connection starts.
explicit OpenSSLAdapter(AsyncSocket* socket,
OpenSSLSessionCache* ssl_session_cache = nullptr,
SSLCertificateVerifier* ssl_cert_verifier = nullptr);
~OpenSSLAdapter() override;
void SetIgnoreBadCert(bool ignore) override;
void SetAlpnProtocols(const std::vector<std::string>& protos) override;
void SetEllipticCurves(const std::vector<std::string>& curves) override;
void SetMode(SSLMode mode) override;
void SetCertVerifier(SSLCertificateVerifier* ssl_cert_verifier) override;
void SetIdentity(std::unique_ptr<SSLIdentity> identity) override;
void SetRole(SSLRole role) override;
AsyncSocket* Accept(SocketAddress* paddr) override;
int StartSSL(const char* hostname) override;
int Send(const void* pv, size_t cb) override;
int SendTo(const void* pv, size_t cb, const SocketAddress& addr) override;
int Recv(void* pv, size_t cb, int64_t* timestamp) override;
int RecvFrom(void* pv,
size_t cb,
SocketAddress* paddr,
int64_t* timestamp) override;
int Close() override;
// Note that the socket returns ST_CONNECTING while SSL is being negotiated.
ConnState GetState() const override;
bool IsResumedSession() override;
// Creates a new SSL_CTX object, configured for client-to-server usage
// with SSLMode |mode|, and if |enable_cache| is true, with support for
// storing successful sessions so that they can be later resumed.
// OpenSSLAdapterFactory will call this method to create its own internal
// SSL_CTX, and OpenSSLAdapter will also call this when used without a
// factory.
static SSL_CTX* CreateContext(SSLMode mode, bool enable_cache);
void OnConnectEvent(AsyncSocket* socket) override;
void OnReadEvent(AsyncSocket* socket) override;
void OnWriteEvent(AsyncSocket* socket) override;
void OnCloseEvent(AsyncSocket* socket, int err) override;
enum SSLState {
enum { MSG_TIMEOUT };
int BeginSSL();
int ContinueSSL();
void Error(const char* context, int err, bool signal = true);
void Cleanup();
// Return value and arguments have the same meanings as for Send; |error| is
// an output parameter filled with the result of SSL_get_error.
int DoSslWrite(const void* pv, size_t cb, int* error);
void OnMessage(Message* msg) override;
bool SSLPostConnectionCheck(SSL* ssl, const std::string& host);
#if !defined(NDEBUG)
// In debug builds, logs info about the state of the SSL connection.
static void SSLInfoCallback(const SSL* ssl, int where, int ret);
static int SSLVerifyCallback(int ok, X509_STORE_CTX* store);
friend class OpenSSLStreamAdapter; // for custom_verify_callback_;
// If the SSL_CTX was created with |enable_cache| set to true, this callback
// will be called when a SSL session has been successfully established,
// to allow its SSL_SESSION* to be cached for later resumption.
static int NewSSLSessionCallback(SSL* ssl, SSL_SESSION* session);
// Optional SSL Shared session cache to improve performance.
OpenSSLSessionCache* ssl_session_cache_ = nullptr;
// Optional SSL Certificate verifier which can be set by a third party.
SSLCertificateVerifier* ssl_cert_verifier_ = nullptr;
// The current connection state of the (d)TLS connection.
SSLState state_;
std::unique_ptr<OpenSSLIdentity> identity_;
// Indicates whethere this is a client or a server.
SSLRole role_;
bool ssl_read_needs_write_;
bool ssl_write_needs_read_;
// This buffer is used if SSL_write fails with SSL_ERROR_WANT_WRITE, which
// means we need to keep retrying with *the same exact data* until it
// succeeds. Afterwards it will be cleared.
Buffer pending_data_;
SSL* ssl_;
// Holds the SSL context, which may be shared if an session cache is provided.
SSL_CTX* ssl_ctx_;
// Hostname of server that is being connected, used for SNI.
std::string ssl_host_name_;
// Set the adapter to DTLS or TLS mode before creating the context.
SSLMode ssl_mode_;
// If true, the server certificate need not match the configured hostname.
bool ignore_bad_cert_;
// List of protocols to be used in the TLS ALPN extension.
std::vector<std::string> alpn_protocols_;
// List of elliptic curves to be used in the TLS elliptic curves extension.
std::vector<std::string> elliptic_curves_;
// Holds the result of the call to run of the ssl_cert_verify_->Verify()
bool custom_cert_verifier_status_;
// The OpenSSLAdapterFactory is responsbile for creating multiple new
// OpenSSLAdapters with a shared SSL_CTX and a shared SSL_SESSION cache. The
// SSL_SESSION cache allows existing SSL_SESSIONS to be reused instead of
// recreating them leading to a significant performance improvement.
class OpenSSLAdapterFactory : public SSLAdapterFactory {
~OpenSSLAdapterFactory() override;
// Set the SSL Mode to use with this factory. This should only be set before
// the first adapter is created with the factory. If it is called after it
// will DCHECK.
void SetMode(SSLMode mode) override;
// Set a custom certificate verifier to be passed down to each instance
// created with this factory. This should only ever be set before the first
// call to the factory and cannot be changed after the fact.
void SetCertVerifier(SSLCertificateVerifier* ssl_cert_verifier) override;
// Constructs a new socket using the shared OpenSSLSessionCache. This means
// existing SSLSessions already in the cache will be reused instead of
// re-created for improved performance.
OpenSSLAdapter* CreateAdapter(AsyncSocket* socket) override;
// Holds the SSLMode (DTLS,TLS) that will be used to set the session cache.
SSLMode ssl_mode_ = SSL_MODE_TLS;
// Holds a cache of existing SSL Sessions.
std::unique_ptr<OpenSSLSessionCache> ssl_session_cache_;
// Provides an optional custom callback for verifying SSL certificates, this
// in currently only used for TLS-TURN connections.
SSLCertificateVerifier* ssl_cert_verifier_ = nullptr;
// TODO(benwright): Remove this when context is moved to OpenSSLCommon.
// Hold a friend class to the OpenSSLAdapter to retrieve the context.
friend class OpenSSLAdapter;
std::string TransformAlpnProtocols(const std::vector<std::string>& protos);
} // namespace rtc