28e2075280
trunk/talk git-svn-id: http://webrtc.googlecode.com/svn/trunk@4318 4adac7df-926f-26a2-2b94-8c16560cd09d
138 lines
5.2 KiB
C++
138 lines
5.2 KiB
C++
/*
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* libjingle
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* Copyright 2004--2008, Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TALK_BASE_SSLSTREAMADAPTERHELPER_H_
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#define TALK_BASE_SSLSTREAMADAPTERHELPER_H_
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#include <string>
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#include <vector>
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#include "talk/base/buffer.h"
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#include "talk/base/stream.h"
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#include "talk/base/sslidentity.h"
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#include "talk/base/sslstreamadapter.h"
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namespace talk_base {
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// SSLStreamAdapterHelper : A stream adapter which implements much
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// of the logic that is common between the known implementations
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// (NSS and OpenSSL)
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class SSLStreamAdapterHelper : public SSLStreamAdapter {
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public:
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explicit SSLStreamAdapterHelper(StreamInterface* stream)
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: SSLStreamAdapter(stream),
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state_(SSL_NONE),
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role_(SSL_CLIENT),
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ssl_error_code_(0), // Not meaningful yet
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ssl_mode_(SSL_MODE_TLS) {}
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// Overrides of SSLStreamAdapter
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virtual void SetIdentity(SSLIdentity* identity);
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virtual void SetServerRole(SSLRole role = SSL_SERVER);
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virtual void SetMode(SSLMode mode);
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virtual int StartSSLWithServer(const char* server_name);
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virtual int StartSSLWithPeer();
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virtual void SetPeerCertificate(SSLCertificate* cert);
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virtual bool SetPeerCertificateDigest(const std::string& digest_alg,
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const unsigned char* digest_val,
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size_t digest_len);
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virtual StreamState GetState() const;
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virtual void Close();
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protected:
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// Internal helper methods
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// The following method returns 0 on success and a negative
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// error code on failure. The error code may be either -1 or
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// from the impl on some other error cases, so it can't really be
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// interpreted unfortunately.
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// Perform SSL negotiation steps.
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int ContinueSSL();
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// Error handler helper. signal is given as true for errors in
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// asynchronous contexts (when an error code was not returned
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// through some other method), and in that case an SE_CLOSE event is
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// raised on the stream with the specified error.
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// A 0 error means a graceful close, otherwise there is not really enough
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// context to interpret the error code.
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virtual void Error(const char* context, int err, bool signal);
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// Must be implemented by descendents
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virtual int BeginSSL() = 0;
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virtual void Cleanup() = 0;
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virtual bool GetDigestLength(const std::string &algorithm,
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std::size_t *length) = 0;
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enum SSLState {
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// Before calling one of the StartSSL methods, data flows
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// in clear text.
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SSL_NONE,
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SSL_WAIT, // waiting for the stream to open to start SSL negotiation
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SSL_CONNECTING, // SSL negotiation in progress
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SSL_CONNECTED, // SSL stream successfully established
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SSL_ERROR, // some SSL error occurred, stream is closed
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SSL_CLOSED // Clean close
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};
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// MSG_MAX is the maximum generic stream message number.
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enum { MSG_DTLS_TIMEOUT = MSG_MAX + 1 };
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SSLState state_;
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SSLRole role_;
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int ssl_error_code_; // valid when state_ == SSL_ERROR
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// Our key and certificate, mostly useful in peer-to-peer mode.
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scoped_ptr<SSLIdentity> identity_;
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// in traditional mode, the server name that the server's certificate
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// must specify. Empty in peer-to-peer mode.
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std::string ssl_server_name_;
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// In peer-to-peer mode, the certificate that the peer must
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// present. Empty in traditional mode.
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scoped_ptr<SSLCertificate> peer_certificate_;
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// In peer-to-peer mode, the digest of the certificate that
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// the peer must present.
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Buffer peer_certificate_digest_value_;
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std::string peer_certificate_digest_algorithm_;
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// Do DTLS or not
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SSLMode ssl_mode_;
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private:
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// Go from state SSL_NONE to either SSL_CONNECTING or SSL_WAIT,
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// depending on whether the underlying stream is already open or
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// not. Returns 0 on success and a negative value on error.
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int StartSSL();
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};
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} // namespace talk_base
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#endif // TALK_BASE_SSLSTREAMADAPTERHELPER_H_
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