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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.
+ */
+
+#ifndef WEBRTC_BASE_OPENSSLSTREAMADAPTER_H__
+#define WEBRTC_BASE_OPENSSLSTREAMADAPTER_H__
+
+#include <string>
+#include <vector>
+
+#include "webrtc/base/buffer.h"
+#include "webrtc/base/sslstreamadapter.h"
+#include "webrtc/base/opensslidentity.h"
+
+typedef struct ssl_st SSL;
+typedef struct ssl_ctx_st SSL_CTX;
+typedef struct x509_store_ctx_st X509_STORE_CTX;
+
+namespace rtc {
+
+// This class was written with OpenSSLAdapter (a socket adapter) as a
+// starting point. It has similar structure and functionality, with
+// the peer-to-peer mode added.
+//
+// Static methods to initialize and deinit the SSL library are in
+// OpenSSLAdapter. This class also uses
+// OpenSSLAdapter::custom_verify_callback_ (a static field). These
+// should probably be moved out to a neutral class.
+//
+// In a few cases I have factored out some OpenSSLAdapter code into
+// static methods so it can be reused from this class. Eventually that
+// code should probably be moved to a common support
+// class. Unfortunately there remain a few duplicated sections of
+// code. I have not done more restructuring because I did not want to
+// affect existing code that uses OpenSSLAdapter.
+//
+// This class does not support the SSL connection restart feature
+// present in OpenSSLAdapter. I am not entirely sure how the feature
+// is useful and I am not convinced that it works properly.
+//
+// This implementation is careful to disallow data exchange after an
+// SSL error, and it has an explicit SSL_CLOSED state. It should not
+// be possible to send any data in clear after one of the StartSSL
+// methods has been called.
+
+// Look in sslstreamadapter.h for documentation of the methods.
+
+class OpenSSLIdentity;
+
+///////////////////////////////////////////////////////////////////////////////
+
+class OpenSSLStreamAdapter : public SSLStreamAdapter {
+ public:
+ explicit OpenSSLStreamAdapter(StreamInterface* stream);
+ virtual ~OpenSSLStreamAdapter();
+
+ virtual void SetIdentity(SSLIdentity* identity);
+
+ // Default argument is for compatibility
+ virtual void SetServerRole(SSLRole role = SSL_SERVER);
+ virtual bool SetPeerCertificateDigest(const std::string& digest_alg,
+ const unsigned char* digest_val,
+ size_t digest_len);
+
+ virtual bool GetPeerCertificate(SSLCertificate** cert) const;
+
+ virtual int StartSSLWithServer(const char* server_name);
+ virtual int StartSSLWithPeer();
+ virtual void SetMode(SSLMode mode);
+
+ virtual StreamResult Read(void* data, size_t data_len,
+ size_t* read, int* error);
+ virtual StreamResult Write(const void* data, size_t data_len,
+ size_t* written, int* error);
+ virtual void Close();
+ virtual StreamState GetState() const;
+
+ // Key Extractor interface
+ virtual bool ExportKeyingMaterial(const std::string& label,
+ const uint8* context,
+ size_t context_len,
+ bool use_context,
+ uint8* result,
+ size_t result_len);
+
+
+ // DTLS-SRTP interface
+ virtual bool SetDtlsSrtpCiphers(const std::vector<std::string>& ciphers);
+ virtual bool GetDtlsSrtpCipher(std::string* cipher);
+
+ // Capabilities interfaces
+ static bool HaveDtls();
+ static bool HaveDtlsSrtp();
+ static bool HaveExporter();
+
+ protected:
+ virtual void OnEvent(StreamInterface* stream, int events, int err);
+
+ private:
+ enum SSLState {
+ // Before calling one of the StartSSL methods, data flows
+ // in clear text.
+ SSL_NONE,
+ SSL_WAIT, // waiting for the stream to open to start SSL negotiation
+ SSL_CONNECTING, // SSL negotiation in progress
+ SSL_CONNECTED, // SSL stream successfully established
+ SSL_ERROR, // some SSL error occurred, stream is closed
+ SSL_CLOSED // Clean close
+ };
+
+ enum { MSG_TIMEOUT = MSG_MAX+1};
+
+ // The following three methods return 0 on success and a negative
+ // error code on failure. The error code may be from OpenSSL or -1
+ // on some other error cases, so it can't really be interpreted
+ // unfortunately.
+
+ // Go from state SSL_NONE to either SSL_CONNECTING or SSL_WAIT,
+ // depending on whether the underlying stream is already open or
+ // not.
+ int StartSSL();
+ // Prepare SSL library, state is SSL_CONNECTING.
+ int BeginSSL();
+ // Perform SSL negotiation steps.
+ int ContinueSSL();
+
+ // Error handler helper. signal is given as true for errors in
+ // asynchronous contexts (when an error method was not returned
+ // through some other method), and in that case an SE_CLOSE event is
+ // raised on the stream with the specified error.
+ // A 0 error means a graceful close, otherwise there is not really enough
+ // context to interpret the error code.
+ void Error(const char* context, int err, bool signal);
+ void Cleanup();
+
+ // Override MessageHandler
+ virtual void OnMessage(Message* msg);
+
+ // Flush the input buffers by reading left bytes (for DTLS)
+ void FlushInput(unsigned int left);
+
+ // SSL library configuration
+ SSL_CTX* SetupSSLContext();
+ // SSL verification check
+ bool SSLPostConnectionCheck(SSL* ssl, const char* server_name,
+ const X509* peer_cert,
+ const std::string& peer_digest);
+ // SSL certification verification error handler, called back from
+ // the openssl library. Returns an int interpreted as a boolean in
+ // the C style: zero means verification failure, non-zero means
+ // passed.
+ static int SSLVerifyCallback(int ok, X509_STORE_CTX* store);
+
+ SSLState state_;
+ SSLRole role_;
+ int ssl_error_code_; // valid when state_ == SSL_ERROR or SSL_CLOSED
+ // Whether the SSL negotiation is blocked on needing to read or
+ // write to the wrapped stream.
+ bool ssl_read_needs_write_;
+ bool ssl_write_needs_read_;
+
+ SSL* ssl_;
+ SSL_CTX* ssl_ctx_;
+
+ // Our key and certificate, mostly useful in peer-to-peer mode.
+ scoped_ptr<OpenSSLIdentity> identity_;
+ // in traditional mode, the server name that the server's certificate
+ // must specify. Empty in peer-to-peer mode.
+ std::string ssl_server_name_;
+ // The certificate that the peer must present or did present. Initially
+ // null in traditional mode, until the connection is established.
+ scoped_ptr<OpenSSLCertificate> peer_certificate_;
+ // In peer-to-peer mode, the digest of the certificate that
+ // the peer must present.
+ Buffer peer_certificate_digest_value_;
+ std::string peer_certificate_digest_algorithm_;
+
+ // OpenSSLAdapter::custom_verify_callback_ result
+ bool custom_verification_succeeded_;
+
+ // The DtlsSrtp ciphers
+ std::string srtp_ciphers_;
+
+ // Do DTLS or not
+ SSLMode ssl_mode_;
+};
+
+/////////////////////////////////////////////////////////////////////////////
+
+} // namespace rtc
+
+#endif // WEBRTC_BASE_OPENSSLSTREAMADAPTER_H__