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BUG#: 5634
TITLE: PEP 259 SSL Certificate Management Command Interfaces - phase 4

DESCRIPTION: Removed export SSL connection code and config parameters exportSSLTrustStore and enableExportSSLClientVerification. Added cimcrl and cimtrust man pages. Updated SSL guidelines document.

//%2006////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development
// Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
// Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation, The Open Group.
// Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; Symantec Corporation; The Open Group.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
// ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
// "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//==============================================================================
//
//%/////////////////////////////////////////////////////////////////////////////

#include <Pegasus/Common/Socket.h>
#include <Pegasus/Common/Tracer.h>
#include <Pegasus/Common/SSLContextRep.h>
#include <Pegasus/Common/SSLContext.h>
#include <Pegasus/Common/MessageLoader.h> //l10n
#include <Pegasus/Common/FileSystem.h>

#include "TLS.h"

#ifdef PEGASUS_OS_ZOS
#include "SocketzOS_inline.h"
#endif

//
// use the following definitions only if SSL is available
//
#ifdef PEGASUS_HAS_SSL

PEGASUS_NAMESPACE_BEGIN

//
// Basic SSL socket
//

SSLSocket::SSLSocket(
    SocketHandle socket,
    SSLContext * sslcontext,
    ReadWriteSem * sslContextObjectLock)
   :
   _SSLConnection(0),
   _socket(socket),
   _SSLContext(sslcontext),
   _sslContextObjectLock(sslContextObjectLock),
   _SSLCallbackInfo(0),
   _certificateVerified(false)
{
    PEG_METHOD_ENTER(TRC_SSL, "SSLSocket::SSLSocket()");

    _sslReadErrno = 0;

    //
    // create the SSLConnection area
    //
    if (!( _SSLConnection = SSL_new(_SSLContext->_rep->getContext() )))
    {
        PEG_METHOD_EXIT();
        //l10n
        //throw( SSLException("Could not get SSL Connection Area"));
        MessageLoaderParms parms("Common.TLS.COULD_NOT_GET_SSL_CONNECTION_AREA",
            					 "Could not get SSL Connection Area");
        throw SSLException(parms);
    }

    // This try/catch block is necessary so that we can free the SSL Connection
    // Area if any exceptions are thrown.
    try
    {
        //
        // set the verification callback data
        //

        //we are only storing one set of data, so we can just use index 0, this is defined in SSLContext.h
        //int index = SSL_get_ex_new_index(0, (void*)"pegasus", NULL, NULL, NULL);

        //
        // Create a new callback info for each new connection
        //
        _SSLCallbackInfo.reset(new SSLCallbackInfo(_SSLContext->getSSLCertificateVerifyFunction()
#ifdef PEGASUS_ENABLE_SSL_CRL_VERIFICATION
                                                   , _SSLContext->getCRLStore()));
#else
                                                   ));
#endif

        if (SSL_set_ex_data(_SSLConnection, SSLCallbackInfo::SSL_CALLBACK_INDEX, _SSLCallbackInfo.get()))
        {
            PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL4, "--->SSL: Set callback info");
        }
        else
        {
            PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL3, "--->SSL: Error setting callback info");
        }

        //
        // and connect the active socket with the ssl operation
        //
        if (!(SSL_set_fd(_SSLConnection, _socket) ))
        {
            PEG_METHOD_EXIT();
            //l10n
            //throw( SSLException("Could not link socket to SSL Connection"));
            MessageLoaderParms parms("Common.TLS.COULD_NOT_LINK_SOCKET",
            					 "Could not link socket to SSL Connection");
            throw SSLException(parms);
        }
    }
    catch(...)
    {
        SSL_free(_SSLConnection);
        throw;
    }

    PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL4, "---> SSL: Created SSL socket");

    PEG_METHOD_EXIT();
}

SSLSocket::~SSLSocket()
{
    PEG_METHOD_ENTER(TRC_SSL, "SSLSocket::~SSLSocket()");

    SSL_free(_SSLConnection);

    PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL3, "---> SSL: Deleted SSL socket");

    PEG_METHOD_EXIT();
}


Boolean SSLSocket::incompleteReadOccurred(Sint32 retCode)
{
    Sint32 err = SSL_get_error(_SSLConnection, retCode);

    Tracer::trace(TRC_SSL, Tracer::LEVEL4,
        "In SSLSocket::incompleteReadOccurred : err = %d", err);

    return ((err == SSL_ERROR_SYSCALL) && (_sslReadErrno == EAGAIN || _sslReadErrno == EINTR)) ||
            err == SSL_ERROR_WANT_READ ||
            err == SSL_ERROR_WANT_WRITE;
}

Sint32 SSLSocket::read(void* ptr, Uint32 size)
{
    PEG_METHOD_ENTER(TRC_SSL, "SSLSocket::read()");
    Sint32 rc;

    PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL4, "---> SSL: (r) ");
    PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL4, SSL_state_string_long(_SSLConnection) );
    rc = SSL_read(_SSLConnection, (char *)ptr, size);

    _sslReadErrno = errno;

    PEG_METHOD_EXIT();
    return rc;
}

Sint32 SSLSocket::timedWrite( const void* ptr,
                              Uint32 size,
                              Uint32 socketWriteTimeout)
{
    PEG_METHOD_ENTER(TRC_SSL, "SSLSocket::timedWrite()");
    Sint32 bytesWritten = 0;
    Sint32 totalBytesWritten = 0;
    Boolean socketTimedOut = false;
    Uint32 selreturn = 0;

  while (1)
  {
    PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL4, "---> SSL: (w) ");
    PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL4, 
                     SSL_state_string_long(_SSLConnection) );
    bytesWritten = SSL_write(_SSLConnection, (char *)ptr, size);

    // Some data written this cycle ?
    // Add it to the total amount of written data.
    if (bytesWritten > 0)
    {
        totalBytesWritten += bytesWritten;
        socketTimedOut = false;
    }

    // All data written ? return amount of data written
    if ((Uint32)bytesWritten == size)
    {
        // exit the while loop
        break;
    }
    // If data has been written partially, we resume writing data
    // this also accounts for the case of a signal interrupt
    // (i.e. errno = EINTR)
    if (bytesWritten > 0)
    {
        size -= bytesWritten;
        ptr = (void *)((char *)ptr + bytesWritten);
        continue;
    }
    // Something went wrong, SSL return with everything not > 0 is an error
    if (bytesWritten <= 0)
    {
        // if we already waited for the socket to get ready, bail out
        if( socketTimedOut )
        {
            // bytesWritten contains the error indication
            PEG_METHOD_EXIT();
            return bytesWritten;
        }

        // just interrupted by a signal, try again
#ifdef PEGASUS_OS_TYPE_WINDOWS
        if (WSAGetLastError() == WSAEINTR) continue;
#else        
        if (errno == EINTR) continue;
#endif

        // socket not ready ...
#ifdef PEGASUS_OS_TYPE_WINDOWS
        if (WSAGetLastError() == WSAEWOULDBLOCK)
#else        
        if (errno == EAGAIN || errno == EWOULDBLOCK)
#endif
        {
            fd_set fdwrite;
            // max. timeout seconds waiting for the socket to get ready
            struct timeval tv = {socketWriteTimeout , 0 };
            FD_ZERO(&fdwrite);
            FD_SET(_socket, &fdwrite);
            selreturn = select(FD_SETSIZE, NULL, &fdwrite, NULL, &tv);
            if (selreturn == 0) socketTimedOut = true; // ran out of time
            continue;            
        }
        // bytesWritten contains the error indication
        PEG_METHOD_EXIT();
        return bytesWritten;
    }
  }
    PEG_METHOD_EXIT();
    return totalBytesWritten;
}

void SSLSocket::close()
{
    PEG_METHOD_ENTER(TRC_SSL, "SSLSocket::close()");

    SSL_shutdown(_SSLConnection);
    Socket::close(_socket);

    PEG_METHOD_EXIT();
}

void SSLSocket::enableBlocking()
{
    Socket::enableBlocking(_socket);
}

void SSLSocket::disableBlocking()
{
    Socket::disableBlocking(_socket);
}

void SSLSocket::initializeInterface()
{
    Socket::initializeInterface();
    PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL3, "---> SSL: initialized SSL");
}

void SSLSocket::uninitializeInterface()
{
    Socket::uninitializeInterface();
}

Sint32 SSLSocket::accept()
{
    PEG_METHOD_ENTER(TRC_SSL, "SSLSocket::accept()");

    Sint32 ssl_rc,ssl_rsn;

    //ATTN: these methods get implicitly done with the SSL_accept call
    //SSL_do_handshake(_SSLConnection);
    //SSL_set_accept_state(_SSLConnection);

    // Make sure the SSLContext object is not updated during this operation.
    ReadLock rlock(*_sslContextObjectLock);

    ssl_rc = SSL_accept(_SSLConnection);

    if (ssl_rc < 0)
    {
       ssl_rsn = SSL_get_error(_SSLConnection, ssl_rc);
       Tracer::trace(TRC_SSL, Tracer::LEVEL3, "---> SSL: Not accepted %d", ssl_rsn );

       if ((ssl_rsn == SSL_ERROR_WANT_READ) ||
           (ssl_rsn == SSL_ERROR_WANT_WRITE))
       {
           PEG_METHOD_EXIT();
           return 0;
       }
       else
       {
           PEG_METHOD_EXIT();
           return -1;
       }
    }
    else if (ssl_rc == 0)
    {
       ssl_rsn = SSL_get_error(_SSLConnection, ssl_rc);
       PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL3, "Shutdown SSL_accept()");
       Tracer::trace(TRC_SSL, Tracer::LEVEL4, "Error Code:  %d", ssl_rsn );
       PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL4,
           "Error string: " + String(ERR_error_string(ssl_rc, NULL)));

       PEG_METHOD_EXIT();
       return -1;
    }
    PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL3, "---> SSL: Accepted");

    //
    // If peer certificate verification is enabled or request received on
    // export connection, get the peer certificate and verify the trust
    // store validation result.
    //
    if (_SSLContext->isPeerVerificationEnabled())
    {
        PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL3, "Attempting to certify client");

        //
        // get client's certificate
        //
        X509 * client_cert = SSL_get_peer_certificate(_SSLConnection);
        if (client_cert != NULL)
        {
            //
            // get certificate verification result
            //
            int verifyResult = SSL_get_verify_result(_SSLConnection);
            Tracer::trace(TRC_SSL, Tracer::LEVEL3, "Verification Result:  %d", verifyResult );

            if (verifyResult == X509_V_OK)
            {
                PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL2,
                    "---> SSL: Client Certificate verified.");
                //
                // set flag to indicate that the certificate was verified in
                // the trust store.
                //
                _certificateVerified = true;
            }
            else
            {
                PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL2,
                     "---> SSL: Client Certificate not verified");
            }

            X509_free(client_cert);
        }
        else
        {
            PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL3,
                "---> SSL: Client not certified, no certificate received");
        }
    }
    else
    {
        PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL3, "---> SSL: Client certification disabled");
    }

    PEG_METHOD_EXIT();
    return 1;
}

Sint32 SSLSocket::connect()
{
    PEG_METHOD_ENTER(TRC_SSL, "SSLSocket::connect()");

    Sint32 ssl_rc,ssl_rsn;

    SSL_set_connect_state(_SSLConnection);

redo_connect:

    ssl_rc = SSL_connect(_SSLConnection);

    if (ssl_rc < 0)
    {
       ssl_rsn = SSL_get_error(_SSLConnection, ssl_rc);
       PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL3, "---> SSL: Not connected " + ssl_rsn );

       if ((ssl_rsn == SSL_ERROR_WANT_READ) ||
           (ssl_rsn == SSL_ERROR_WANT_WRITE))
       {
           goto redo_connect;
       }
       else
       {
           PEG_METHOD_EXIT();
           return -1;
       }
    }
    else if (ssl_rc == 0)
    {
       PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL3, "---> SSL: Shutdown SSL_connect()");
       PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL3,
           "Error string: " + String(ERR_error_string(ssl_rc, NULL)));
       PEG_METHOD_EXIT();
       return -1;
    }
    PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL3, "---> SSL: Connected");

    if (_SSLContext->isPeerVerificationEnabled())
    {
        PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL3, "Attempting to verify server certificate.");

        X509 * server_cert = SSL_get_peer_certificate(_SSLConnection);
        if (server_cert != NULL)
        {
            //
            // Do not check the verification result using SSL_get_verify_result here to see whether or not to continue.
            // The prepareForCallback does not reset the verification result, so it will still contain the original error.
            // If the client chose to override the default error in the callback and return true, we got here and
            // should proceed with the transaction.  Otherwise, the handshake was already terminated.
            //

            if (SSL_get_verify_result(_SSLConnection) == X509_V_OK)
            {
                 PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL3, "--->SSL: Server Certificate verified.");
            }
            else
            {
                PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL3, "--->SSL: Server Certificate not verified, but the callback overrode the default error.");
            }

            X509_free (server_cert);
        }
        else
        {
            PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL3, "-->SSL: Server not certified, no certificate received.");
            PEG_METHOD_EXIT();
            return -1;
        }
    }
    else
    {
        PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL3, "---> SSL: Server certification disabled");
    }

    PEG_METHOD_EXIT();
    return ssl_rc;
}

Boolean SSLSocket::isPeerVerificationEnabled()
{
    return (_SSLContext->isPeerVerificationEnabled());
}

Array<SSLCertificateInfo*> SSLSocket::getPeerCertificateChain()
{
    Array<SSLCertificateInfo*> peerCertificate;

    if (_SSLCallbackInfo.get())
    {
        peerCertificate = _SSLCallbackInfo->_rep->peerCertificate;
    }

    return peerCertificate;
}

Boolean SSLSocket::isCertificateVerified()
{
    return _certificateVerified;
}


//
// MP_Socket (Multi-purpose Socket class)
//



MP_Socket::MP_Socket(SocketHandle socket)
 : _socket(socket), _isSecure(false), _socketWriteTimeout(20) {}

MP_Socket::MP_Socket(
    SocketHandle socket,
    SSLContext * sslcontext,
    ReadWriteSem * sslContextObjectLock)
{
    PEG_METHOD_ENTER(TRC_SSL, "MP_Socket::MP_Socket()");
    if (sslcontext != NULL)
    {
        _isSecure = true;
        _sslsock = new SSLSocket(
            socket, sslcontext, sslContextObjectLock);
    }
    else
    {
        _isSecure = false;
        _socket = socket;
    }
     // 20 seconds are the default for client timeouts
    _socketWriteTimeout = 20;
    PEG_METHOD_EXIT();
}

MP_Socket::~MP_Socket()
{
    PEG_METHOD_ENTER(TRC_SSL, "MP_Socket::~MP_Socket()");
    if (_isSecure)
    {
        delete _sslsock;
    }
    PEG_METHOD_EXIT();
}

Boolean MP_Socket::isSecure() {return _isSecure;}

Boolean MP_Socket::incompleteReadOccurred(Sint32 retCode)
{
    if (_isSecure)
        return(_sslsock->incompleteReadOccurred(retCode));
    return (retCode <=  0);
}

SocketHandle MP_Socket::getSocket()
{
    if (_isSecure)
        return _sslsock->getSocket();
    else
        return _socket;
}

Sint32 MP_Socket::read(void * ptr, Uint32 size)
{
    if (_isSecure)
        return _sslsock->read(ptr,size);
    else
        return Socket::read(_socket,ptr,size);
}

Sint32 MP_Socket::write(const void * ptr, Uint32 size)
{
    if (_isSecure)
        return _sslsock->timedWrite(ptr,size,_socketWriteTimeout);
    else
        return Socket::timedWrite(_socket,ptr,size,_socketWriteTimeout);
}

void MP_Socket::close()
{
    if (_isSecure)
        _sslsock->close();
    else
        Socket::close(_socket);
}

void MP_Socket::enableBlocking()
{
    if (_isSecure)
        _sslsock->enableBlocking();
    else
        Socket::enableBlocking(_socket);
}

void MP_Socket::disableBlocking()
{
    if (_isSecure)
        _sslsock->disableBlocking();
    else
       Socket::disableBlocking(_socket);
}

Sint32 MP_Socket::accept()
{
    if (_isSecure)
    {
        return (_sslsock->accept());
    }
    return 1;
}

Sint32 MP_Socket::connect()
{
    if (_isSecure)
        if (_sslsock->connect() < 0) return -1;
    return 0;
}

Boolean MP_Socket::isPeerVerificationEnabled()
{
    if (_isSecure)
    {
        return (_sslsock->isPeerVerificationEnabled());
    }
    return false;
}

Array<SSLCertificateInfo*> MP_Socket::getPeerCertificateChain()
{
    Array<SSLCertificateInfo*> peerCertificate;

    if (_isSecure)
    {
        peerCertificate = _sslsock->getPeerCertificateChain();
    }
    return peerCertificate;
}

Boolean MP_Socket::isCertificateVerified()
{
    if (_isSecure)
    {
        return (_sslsock->isCertificateVerified());
    }
    return false;
}

void MP_Socket::setSocketWriteTimeout(Uint32 socketWriteTimeout)
{
    _socketWriteTimeout = socketWriteTimeout;
}

PEGASUS_NAMESPACE_END

#else

PEGASUS_NAMESPACE_BEGIN

#ifndef PEGASUS_OS_ZOS

MP_Socket::MP_Socket(SocketHandle socket)
 : _socket(socket), _isSecure(false), _socketWriteTimeout(20) {}

MP_Socket::MP_Socket(
    SocketHandle socket,
    SSLContext * sslcontext,
    ReadWriteSem * sslContextObjectLock)
 : _socket(socket), _isSecure(false), _socketWriteTimeout(20) {}

#endif

MP_Socket::~MP_Socket() {}

Boolean MP_Socket::isSecure() {return _isSecure;}

Boolean MP_Socket::incompleteReadOccurred(Sint32 retCode)
{
   return (retCode <= 0);
}

SocketHandle MP_Socket::getSocket()
{
    return _socket;
}

Sint32 MP_Socket::read(void * ptr, Uint32 size)
{
    return Socket::read(_socket,ptr,size);
}

Sint32 MP_Socket::write(const void * ptr, Uint32 size)
{
    return Socket::timedWrite(_socket,ptr,size,_socketWriteTimeout);
}

void MP_Socket::close()
{
    Socket::close(_socket);
}

void MP_Socket::enableBlocking()
{
    Socket::enableBlocking(_socket);
}

void MP_Socket::disableBlocking()
{
    Socket::disableBlocking(_socket);
}

Sint32 MP_Socket::accept() 
{ 
#ifndef PEGASUS_OS_ZOS
    return 1; 
#else
PEG_METHOD_ENTER(TRC_SSL, "MP_Socket::accept()");
// ****************************************************************************
// This is a z/OS speciffic section. No other platform can port this.
// Pegsus on z/OS has no OpenSSL but cat use a transparent layer called
// AT-TLS ( Applicatin Transparent Transport Layer Security ) to handel 
// HTTTPS connections.
// ****************************************************************************

int rc;

if(isSecure())
{
   PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL4, "---> HTTPS processing.");
   rc = ATTLS_zOS_query();
} else
{
   PEG_TRACE_STRING(TRC_SSL, Tracer::LEVEL4, "---> Normal HTTP processing.");
   rc = 1;
}
PEG_METHOD_EXIT();
return rc;

#endif

}

Sint32 MP_Socket::connect() { return 0; }

Boolean MP_Socket::isPeerVerificationEnabled() { return false; }

Array<SSLCertificateInfo*> MP_Socket::getPeerCertificateChain()
{
//
//  Return empty array
//
return Array<SSLCertificateInfo*>();
}

Boolean MP_Socket::isCertificateVerified() { return false; }

void MP_Socket::setSocketWriteTimeout(Uint32 socketWriteTimeout)
{
    _socketWriteTimeout = socketWriteTimeout;
}


PEGASUS_NAMESPACE_END

#endif // end of PEGASUS_HAS_SSL