Python clienthelper.ClientHelper类代码示例

 def connect(self):
      httplib.HTTPConnection.connect(self)
      sock = self.sock
      self.sock = TLSConnection(self.sock)
      self.sock.fileno = lambda: sock.fd
      self.sock.wait_for_read = sock.wait_for_read
      self.sock.wait_for_write = sock.wait_for_write
      self.sock.ignoreAbruptClose = self.ignoreAbruptClose
      ClientHelper._handshake(self, self.sock)

    def open(self, host = '', port = IMAP4_TLS_PORT):
        """Setup connection to remote server on "host:port".

        This connection will be used by the routines:
        read, readline, send, shutdown.
        """
        self.host = host
        self.port = port
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.sock.connect((host, port))
        self.sock = TLSConnection(self.sock)
        ClientHelper._handshake(self, self.sock)
        self.file = self.sock.makefile('rb')

def wrap_socket(sock,
    keyfile = None,
    certfile = None,
    server_side = False,
    cert_reqs = CERT_NONE,
    ssl_version = PROTOCOL_SSLv23,
    ca_certs = None,
    do_handshake_on_connect = True,
    suppress_ragged_eofs = True,
    ciphers = None,
    fingerprint = None):

    try:
        sock = TLSConnection(sock)

        if do_handshake_on_connect:
            checker = None if fingerprint is None else tlslite.CheckerXfw(x509Fingerprint=fingerprint)
            helper = ClientHelper(checker=checker)
            helper._handshake(sock)
    except:
        sock = None
        raise

    return sock

#.........这里部分代码省略.........

        An instance of this class can be passed to L{xmlrpclib.ServerProxy}
        to use TLS with XML-RPC calls::

            from tlslite.api import XMLRPCTransport
            from xmlrpclib import ServerProxy

            transport = XMLRPCTransport(user="alice", password="abra123")
            server = ServerProxy("https://localhost", transport)

        For client authentication, use one of these argument
        combinations:
         - username, password (SRP)
         - username, sharedKey (shared-key)
         - certChain, privateKey (certificate)

        For server authentication, you can either rely on the
        implicit mutual authentication performed by SRP or
        shared-keys, or you can do certificate-based server
        authentication with one of these argument combinations:
         - cryptoID[, protocol] (requires cryptoIDlib)
         - x509Fingerprint
         - x509TrustList[, x509CommonName] (requires cryptlib_py)

        Certificate-based server authentication is compatible with
        SRP or certificate-based client authentication.  It is
        not compatible with shared-keys.

        The constructor does not perform the TLS handshake itself, but
        simply stores these arguments for later.  The handshake is
        performed only when this class needs to connect with the
        server.  Thus you should be prepared to handle TLS-specific
        exceptions when calling methods of L{xmlrpclib.ServerProxy}.  See the
        client handshake functions in
        L{tlslite.TLSConnection.TLSConnection} for details on which
        exceptions might be raised.

        @type username: str
        @param username: SRP or shared-key username.  Requires the
        'password' or 'sharedKey' argument.

        @type password: str
        @param password: SRP password for mutual authentication.
        Requires the 'username' argument.

        @type sharedKey: str
        @param sharedKey: Shared key for mutual authentication.
        Requires the 'username' argument.

        @type certChain: L{tlslite.X509CertChain.X509CertChain} or
        L{cryptoIDlib.CertChain.CertChain}
        @param certChain: Certificate chain for client authentication.
        Requires the 'privateKey' argument.  Excludes the SRP or
        shared-key related arguments.

        @type privateKey: L{tlslite.utils.RSAKey.RSAKey}
        @param privateKey: Private key for client authentication.
        Requires the 'certChain' argument.  Excludes the SRP or
        shared-key related arguments.

        @type cryptoID: str
        @param cryptoID: cryptoID for server authentication.  Mutually
        exclusive with the 'x509...' arguments.

        @type protocol: str
        @param protocol: cryptoID protocol URI for server
        authentication.  Requires the 'cryptoID' argument.

        @type x509Fingerprint: str
        @param x509Fingerprint: Hex-encoded X.509 fingerprint for
        server authentication.  Mutually exclusive with the 'cryptoID'
        and 'x509TrustList' arguments.

        @type x509TrustList: list of L{tlslite.X509.X509}
        @param x509TrustList: A list of trusted root certificates.  The
        other party must present a certificate chain which extends to
        one of these root certificates.  The cryptlib_py module must be
        installed to use this parameter.  Mutually exclusive with the
        'cryptoID' and 'x509Fingerprint' arguments.

        @type x509CommonName: str
        @param x509CommonName: The end-entity certificate's 'CN' field
        must match this value.  For a web server, this is typically a
        server name such as 'www.amazon.com'.  Mutually exclusive with
        the 'cryptoID' and 'x509Fingerprint' arguments.  Requires the
        'x509TrustList' argument.

        @type settings: L{tlslite.HandshakeSettings.HandshakeSettings}
        @param settings: Various settings which can be used to control
        the ciphersuites, certificate types, and SSL/TLS versions
        offered by the client.
        """

        ClientHelper.__init__(self,
                 username, password, sharedKey,
                 certChain, privateKey,
                 cryptoID, protocol,
                 x509Fingerprint,
                 x509TrustList, x509CommonName,
                 settings)

    def starttls(
        self,
        username=None,
        password=None,
        sharedKey=None,
        certChain=None,
        privateKey=None,
        cryptoID=None,
        protocol=None,
        x509Fingerprint=None,
        x509TrustList=None,
        x509CommonName=None,
        settings=None,
    ):
        """Puts the connection to the SMTP server into TLS mode.

        If the server supports TLS, this will encrypt the rest of the SMTP
        session.

        For client authentication, use one of these argument
        combinations:
         - username, password (SRP)
         - username, sharedKey (shared-key)
         - certChain, privateKey (certificate)

        For server authentication, you can either rely on the
        implicit mutual authentication performed by SRP or
        shared-keys, or you can do certificate-based server
        authentication with one of these argument combinations:
         - cryptoID[, protocol] (requires cryptoIDlib)
         - x509Fingerprint
         - x509TrustList[, x509CommonName] (requires cryptlib_py)

        Certificate-based server authentication is compatible with
        SRP or certificate-based client authentication.  It is
        not compatible with shared-keys.

        The caller should be prepared to handle TLS-specific
        exceptions.  See the client handshake functions in
        L{tlslite.TLSConnection.TLSConnection} for details on which
        exceptions might be raised.

        @type username: str
        @param username: SRP or shared-key username.  Requires the
        'password' or 'sharedKey' argument.

        @type password: str
        @param password: SRP password for mutual authentication.
        Requires the 'username' argument.

        @type sharedKey: str
        @param sharedKey: Shared key for mutual authentication.
        Requires the 'username' argument.

        @type certChain: L{tlslite.X509CertChain.X509CertChain} or
        L{cryptoIDlib.CertChain.CertChain}
        @param certChain: Certificate chain for client authentication.
        Requires the 'privateKey' argument.  Excludes the SRP or
        shared-key related arguments.

        @type privateKey: L{tlslite.utils.RSAKey.RSAKey}
        @param privateKey: Private key for client authentication.
        Requires the 'certChain' argument.  Excludes the SRP or
        shared-key related arguments.

        @type cryptoID: str
        @param cryptoID: cryptoID for server authentication.  Mutually
        exclusive with the 'x509...' arguments.

        @type protocol: str
        @param protocol: cryptoID protocol URI for server
        authentication.  Requires the 'cryptoID' argument.

        @type x509Fingerprint: str
        @param x509Fingerprint: Hex-encoded X.509 fingerprint for
        server authentication.  Mutually exclusive with the 'cryptoID'
        and 'x509TrustList' arguments.

        @type x509TrustList: list of L{tlslite.X509.X509}
        @param x509TrustList: A list of trusted root certificates.  The
        other party must present a certificate chain which extends to
        one of these root certificates.  The cryptlib_py module must be
        installed to use this parameter.  Mutually exclusive with the
        'cryptoID' and 'x509Fingerprint' arguments.

        @type x509CommonName: str
        @param x509CommonName: The end-entity certificate's 'CN' field
        must match this value.  For a web server, this is typically a
        server name such as 'www.amazon.com'.  Mutually exclusive with
        the 'cryptoID' and 'x509Fingerprint' arguments.  Requires the
        'x509TrustList' argument.

        @type settings: L{tlslite.HandshakeSettings.HandshakeSettings}
        @param settings: Various settings which can be used to control
        the ciphersuites, certificate types, and SSL/TLS versions
        offered by the client.
        """
        (resp, reply) = self.docmd("STARTTLS")
        if resp == 220:
            helper = ClientHelper(
#.........这里部分代码省略.........

    def __init__(self, host = '', port = IMAP4_TLS_PORT,
                 username=None, password=None,
                 certChain=None, privateKey=None,
                 checker=None,
                 settings=None):
        """Create a new IMAP4_TLS.

        For client authentication, use one of these argument
        combinations:
         - username, password (SRP)
         - certChain, privateKey (certificate)

        For server authentication, you can either rely on the
        implicit mutual authentication performed by SRP
        or you can do certificate-based server
        authentication with one of these argument combinations:
         - x509Fingerprint

        Certificate-based server authentication is compatible with
        SRP or certificate-based client authentication.

        The caller should be prepared to handle TLS-specific
        exceptions.  See the client handshake functions in
        L{tlslite.TLSConnection.TLSConnection} for details on which
        exceptions might be raised.

        @type host: str
        @param host: Server to connect to.

        @type port: int
        @param port: Port to connect to.

        @type username: str
        @param username: SRP username.  Requires the
        'password' argument.

        @type password: str
        @param password: SRP password for mutual authentication.
        Requires the 'username' argument.

        @type certChain: L{tlslite.x509certchain.X509CertChain}
        @param certChain: Certificate chain for client authentication.
        Requires the 'privateKey' argument.  Excludes the SRP arguments.

        @type privateKey: L{tlslite.utils.rsakey.RSAKey}
        @param privateKey: Private key for client authentication.
        Requires the 'certChain' argument.  Excludes the SRP arguments.
        
        @type checker: L{tlslite.checker.Checker}
        @param checker: Callable object called after handshaking to 
        evaluate the connection and raise an Exception if necessary.

        @type settings: L{tlslite.handshakesettings.HandshakeSettings}
        @param settings: Various settings which can be used to control
        the ciphersuites, certificate types, and SSL/TLS versions
        offered by the client.
        """

        ClientHelper.__init__(self,
                 username, password,
                 certChain, privateKey,
                 checker,
                 settings)

        IMAP4.__init__(self, host, port)

    def __init__(self, host = '', port = IMAP4_TLS_PORT,
                 username=None, password=None, sharedKey=None,
                 certChain=None, privateKey=None,
                 cryptoID=None, protocol=None,
                 x509Fingerprint=None,
                 x509TrustList=None, x509CommonName=None,
                 settings=None):
        """Create a new IMAP4_TLS.

        For client authentication, use one of these argument
        combinations:
         - username, password (SRP)
         - username, sharedKey (shared-key)
         - certChain, privateKey (certificate)

        For server authentication, you can either rely on the
        implicit mutual authentication performed by SRP or
        shared-keys, or you can do certificate-based server
        authentication with one of these argument combinations:
         - cryptoID[, protocol] (requires cryptoIDlib)
         - x509Fingerprint
         - x509TrustList[, x509CommonName] (requires cryptlib_py)

        Certificate-based server authentication is compatible with
        SRP or certificate-based client authentication.  It is
        not compatible with shared-keys.

        The caller should be prepared to handle TLS-specific
        exceptions.  See the client handshake functions in
        L{tlslite.TLSConnection.TLSConnection} for details on which
        exceptions might be raised.

        @type host: str
        @param host: Server to connect to.

        @type port: int
        @param port: Port to connect to.

        @type username: str
        @param username: SRP or shared-key username.  Requires the
        'password' or 'sharedKey' argument.

        @type password: str
        @param password: SRP password for mutual authentication.
        Requires the 'username' argument.

        @type sharedKey: str
        @param sharedKey: Shared key for mutual authentication.
        Requires the 'username' argument.

        @type certChain: L{tlslite.X509CertChain.X509CertChain} or
        L{cryptoIDlib.CertChain.CertChain}
        @param certChain: Certificate chain for client authentication.
        Requires the 'privateKey' argument.  Excludes the SRP or
        shared-key related arguments.

        @type privateKey: L{tlslite.utils.RSAKey.RSAKey}
        @param privateKey: Private key for client authentication.
        Requires the 'certChain' argument.  Excludes the SRP or
        shared-key related arguments.

        @type cryptoID: str
        @param cryptoID: cryptoID for server authentication.  Mutually
        exclusive with the 'x509...' arguments.

        @type protocol: str
        @param protocol: cryptoID protocol URI for server
        authentication.  Requires the 'cryptoID' argument.

        @type x509Fingerprint: str
        @param x509Fingerprint: Hex-encoded X.509 fingerprint for
        server authentication.  Mutually exclusive with the 'cryptoID'
        and 'x509TrustList' arguments.

        @type x509TrustList: list of L{tlslite.X509.X509}
        @param x509TrustList: A list of trusted root certificates.  The
        other party must present a certificate chain which extends to
        one of these root certificates.  The cryptlib_py module must be
        installed to use this parameter.  Mutually exclusive with the
        'cryptoID' and 'x509Fingerprint' arguments.

        @type x509CommonName: str
        @param x509CommonName: The end-entity certificate's 'CN' field
        must match this value.  For a web server, this is typically a
        server name such as 'www.amazon.com'.  Mutually exclusive with
        the 'cryptoID' and 'x509Fingerprint' arguments.  Requires the
        'x509TrustList' argument.

        @type settings: L{tlslite.HandshakeSettings.HandshakeSettings}
        @param settings: Various settings which can be used to control
        the ciphersuites, certificate types, and SSL/TLS versions
        offered by the client.
        """

        ClientHelper.__init__(self,
                 username, password, sharedKey,
                 certChain, privateKey,
                 cryptoID, protocol,
                 x509Fingerprint,
                 x509TrustList, x509CommonName,
#.........这里部分代码省略.........

    def starttls(self,
                 username=None, password=None,
                 certChain=None, privateKey=None,
                 checker=None,
                 settings=None):
        """Puts the connection to the SMTP server into TLS mode.

        If the server supports TLS, this will encrypt the rest of the SMTP
        session.

        For client authentication, use one of these argument
        combinations:
         - username, password (SRP)
         - certChain, privateKey (certificate)

        For server authentication, you can either rely on the
        implicit mutual authentication performed by SRP or
        you can do certificate-based server
        authentication with one of these argument combinations:
         - x509Fingerprint

        Certificate-based server authentication is compatible with
        SRP or certificate-based client authentication.

        The caller should be prepared to handle TLS-specific
        exceptions.  See the client handshake functions in
        L{tlslite.TLSConnection.TLSConnection} for details on which
        exceptions might be raised.

        @type username: str
        @param username: SRP username.  Requires the
        'password' argument.

        @type password: str
        @param password: SRP password for mutual authentication.
        Requires the 'username' argument.

        @type certChain: L{tlslite.x509certchain.X509CertChain}
        @param certChain: Certificate chain for client authentication.
        Requires the 'privateKey' argument.  Excludes the SRP arguments.

        @type privateKey: L{tlslite.utils.rsakey.RSAKey}
        @param privateKey: Private key for client authentication.
        Requires the 'certChain' argument.  Excludes the SRP arguments.

        @type checker: L{tlslite.checker.Checker}
        @param checker: Callable object called after handshaking to 
        evaluate the connection and raise an Exception if necessary.

        @type settings: L{tlslite.handshakesettings.HandshakeSettings}
        @param settings: Various settings which can be used to control
        the ciphersuites, certificate types, and SSL/TLS versions
        offered by the client.
        """
        (resp, reply) = self.docmd("STARTTLS")
        if resp == 220:
            helper = ClientHelper(
                     username, password, 
                     certChain, privateKey,
                     checker,
                     settings)
            conn = TLSConnection(self.sock)
            helper._handshake(conn)
            self.sock = conn
            self.file = conn.makefile('rb')
        return (resp, reply)

 def connect(self):
      httplib.HTTPConnection.connect(self)
      self.sock = TLSConnection(self.sock)
      ClientHelper._handshake(self, self.sock)

    def __init__(self, host = '', port = IMAP4_TLS_PORT,
                 username=None, password=None,
                 certChain=None, privateKey=None,
                 x509Fingerprint=None,
                 tackID=None,
                 hardTack=None,
                 settings=None):
        """Create a new IMAP4_TLS.

        For client authentication, use one of these argument
        combinations:
         - username, password (SRP)
         - certChain, privateKey (certificate)

        For server authentication, you can either rely on the
        implicit mutual authentication performed by SRP
        or you can do certificate-based server
        authentication with one of these argument combinations:
         - x509Fingerprint

        Certificate-based server authentication is compatible with
        SRP or certificate-based client authentication.

        The caller should be prepared to handle TLS-specific
        exceptions.  See the client handshake functions in
        L{tlslite.TLSConnection.TLSConnection} for details on which
        exceptions might be raised.

        @type host: str
        @param host: Server to connect to.

        @type port: int
        @param port: Port to connect to.

        @type username: str
        @param username: SRP username.  Requires the
        'password' argument.

        @type password: str
        @param password: SRP password for mutual authentication.
        Requires the 'username' argument.

        @type certChain: L{tlslite.x509certchain.X509CertChain}
        @param certChain: Certificate chain for client authentication.
        Requires the 'privateKey' argument.  Excludes the SRP arguments.

        @type privateKey: L{tlslite.utils.rsakey.RSAKey}
        @param privateKey: Private key for client authentication.
        Requires the 'certChain' argument.  Excludes the SRP arguments.

        @type x509Fingerprint: str
        @param x509Fingerprint: Hex-encoded X.509 fingerprint for
        server authentication.

        @type tackID: str
        @param tackID: TACK ID for server authentication.

        @type hardTack: bool
        @param hardTack: Whether to raise TackBreakSigError on TACK Break.

        @type settings: L{tlslite.handshakesettings.HandshakeSettings}
        @param settings: Various settings which can be used to control
        the ciphersuites, certificate types, and SSL/TLS versions
        offered by the client.
        """

        ClientHelper.__init__(self,
                 username, password,
                 certChain, privateKey,
                 x509Fingerprint,
                 tackID,
                 hardTack,
                 settings)

        IMAP4.__init__(self, host, port)

    def __init__(self,
                 username=None, password=None,
                 certChain=None, privateKey=None,
                 x509Fingerprint=None,
                 tackID=None,
                 hardTack=None,                 
                 settings=None):
        """Create a new XMLRPCTransport.

        An instance of this class can be passed to L{xmlrpclib.ServerProxy}
        to use TLS with XML-RPC calls::

            from tlslite import XMLRPCTransport
            from xmlrpclib import ServerProxy

            transport = XMLRPCTransport(user="alice", password="abra123")
            server = ServerProxy("https://localhost", transport)

        For client authentication, use one of these argument
        combinations:
         - username, password (SRP)
         - certChain, privateKey (certificate)

        For server authentication, you can either rely on the
        implicit mutual authentication performed by SRP or
        you can do certificate-based server
        authentication with one of these argument combinations:
         - x509Fingerprint

        Certificate-based server authentication is compatible with
        SRP or certificate-based client authentication.

        The constructor does not perform the TLS handshake itself, but
        simply stores these arguments for later.  The handshake is
        performed only when this class needs to connect with the
        server.  Thus you should be prepared to handle TLS-specific
        exceptions when calling methods of L{xmlrpclib.ServerProxy}.  See the
        client handshake functions in
        L{tlslite.TLSConnection.TLSConnection} for details on which
        exceptions might be raised.

        @type username: str
        @param username: SRP username.  Requires the
        'password' argument.

        @type password: str
        @param password: SRP password for mutual authentication.
        Requires the 'username' argument.

        @type certChain: L{tlslite.x509certchain.X509CertChain}
        @param certChain: Certificate chain for client authentication.
        Requires the 'privateKey' argument.  Excludes the SRP arguments.

        @type privateKey: L{tlslite.utils.rsakey.RSAKey}
        @param privateKey: Private key for client authentication.
        Requires the 'certChain' argument.  Excludes the SRP arguments.

        @type x509Fingerprint: str
        @param x509Fingerprint: Hex-encoded X.509 fingerprint for
        server authentication.

        @type tackID: str
        @param tackID: TACK ID for server authentication.

        @type hardTack: bool
        @param hardTack: Whether to raise TackBreakSigError on TACK Break.

        @type settings: L{tlslite.handshakesettings.HandshakeSettings}
        @param settings: Various settings which can be used to control
        the ciphersuites, certificate types, and SSL/TLS versions
        offered by the client.
        """

        ClientHelper.__init__(self,
                 username, password, 
                 certChain, privateKey,
                 x509Fingerprint,
                 tackID,
                 hardTack,
                 settings)

    def __init__(self, use_datetime=0,
                 username=None, password=None,
                 certChain=None, privateKey=None,
                 checker=None,
                 settings=None,
                 ignoreAbruptClose=False):
        """
        Create a new XMLRPCTransport.

        An instance of this class can be passed to
        :py:class:`xmlrpclib.ServerProxy`
        to use TLS with XML-RPC calls::

            from tlslite import XMLRPCTransport
            from xmlrpclib import ServerProxy

            transport = XMLRPCTransport(user="alice", password="abra123")
            server = ServerProxy("https://localhost", transport)

        For client authentication, use one of these argument
        combinations:

         - username, password (SRP)
         - certChain, privateKey (certificate)

        For server authentication, you can either rely on the
        implicit mutual authentication performed by SRP or
        you can do certificate-based server
        authentication with one of these argument combinations:

         - x509Fingerprint

        Certificate-based server authentication is compatible with
        SRP or certificate-based client authentication.

        The constructor does not perform the TLS handshake itself, but
        simply stores these arguments for later.  The handshake is
        performed only when this class needs to connect with the
        server.  Thus you should be prepared to handle TLS-specific
        exceptions when calling methods of :py:class:`xmlrpclib.ServerProxy`.
        See the
        client handshake functions in
        :py:class:`~tlslite.tlsconnection.TLSConnection` for details on which
        exceptions might be raised.

        :type username: str
        :param username: SRP username.  Requires the
            'password' argument.

        :type password: str
        :param password: SRP password for mutual authentication.
            Requires the 'username' argument.

        :type certChain: ~tlslite.x509certchain.X509CertChain
        :param certChain: Certificate chain for client authentication.
            Requires the 'privateKey' argument.  Excludes the SRP arguments.

        :type privateKey: ~tlslite.utils.rsakey.RSAKey
        :param privateKey: Private key for client authentication.
            Requires the 'certChain' argument.  Excludes the SRP arguments.

        :type checker: ~tlslite.checker.Checker
        :param checker: Callable object called after handshaking to
            evaluate the connection and raise an Exception if necessary.

        :type settings: ~tlslite.handshakesettings.HandshakeSettings
        :param settings: Various settings which can be used to control
            the ciphersuites, certificate types, and SSL/TLS versions
            offered by the client.

        :type ignoreAbruptClose: bool
        :param ignoreAbruptClose: ignore the TLSAbruptCloseError on
            unexpected hangup.
        """
        # self._connection is new in python 2.7, since we're using it here,
        # we'll add this ourselves too, just in case we're pre-2.7
        self._connection = (None, None)
        xmlrpclib.Transport.__init__(self, use_datetime)
        self.ignoreAbruptClose = ignoreAbruptClose
        ClientHelper.__init__(self,
                 username, password, 
                 certChain, privateKey,
                 checker,
                 settings)

    def __init__(self, host, port=None, strict=None, 
                timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
                source_address=None,
                username=None, password=None,
                certChain=None, privateKey=None,
                x509Fingerprint=None,
                tackID=None,
                hardTack=None,
                settings = None):
        """Create a new HTTPTLSConnection.

        For client authentication, use one of these argument
        combinations:
         - username, password (SRP)
         - certChain, privateKey (certificate)

        For server authentication, you can either rely on the
        implicit mutual authentication performed by SRP
        or you can do certificate-based server
        authentication with one of these argument combinations:
         - x509Fingerprint

        Certificate-based server authentication is compatible with
        SRP or certificate-based client authentication.

        The constructor does not perform the TLS handshake itself, but
        simply stores these arguments for later.  The handshake is
        performed only when this class needs to connect with the
        server.  Thus you should be prepared to handle TLS-specific
        exceptions when calling methods inherited from
        L{httplib.HTTPConnection} such as request(), connect(), and
        send().  See the client handshake functions in
        L{tlslite.TLSConnection.TLSConnection} for details on which
        exceptions might be raised.

        @type host: str
        @param host: Server to connect to.

        @type port: int
        @param port: Port to connect to.

        @type username: str
        @param username: SRP username.  Requires the
        'password' argument.

        @type password: str
        @param password: SRP password for mutual authentication.
        Requires the 'username' argument.

        @type certChain: L{tlslite.x509certchain.X509CertChain} or
        @param certChain: Certificate chain for client authentication.
        Requires the 'privateKey' argument.  Excludes the SRP arguments.
        
        @type privateKey: L{tlslite.utils.rsakey.RSAKey}
        @param privateKey: Private key for client authentication.
        Requires the 'certChain' argument.  Excludes the SRP arguments.

        @type x509Fingerprint: str
        @param x509Fingerprint: Hex-encoded X.509 fingerprint for
        server authentication.
        
        @type tackID: str
        @param tackID: TACK ID for server authentication.

        @type hardTack: bool
        @param hardTack: Whether to raise TackBreakSigError on TACK Break.             

        @type settings: L{tlslite.handshakesettings.HandshakeSettings}
        @param settings: Various settings which can be used to control
        the ciphersuites, certificate types, and SSL/TLS versions
        offered by the client.
        """
        if source_address:
            httplib.HTTPConnection.__init__(self, host, port, strict,
                                            timeout, source_address)
        if not source_address:
            httplib.HTTPConnection.__init__(self, host, port, strict,
                                            timeout)
            
        ClientHelper.__init__(self,
                 username, password, 
                 certChain, privateKey,
                 x509Fingerprint,
                 tackID,
                 hardTack,
                 settings)

 def connect(self):
     httplib.HTTPConnection.connect(self)
     self.sock = TLSConnection(self.sock)
     self.sock.ignoreAbruptClose = self.ignoreAbruptClose
     ClientHelper._handshake(self, self.sock)

    def __init__(self, host, port = POP3_SSL_PORT,
                 timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
                 username=None, password=None,
                 certChain=None, privateKey=None,
                 checker=None,
                 settings=None):
        """Create a new POP3_TLS.

        For client authentication, use one of these argument
        combinations:

         - username, password (SRP)
         - certChain, privateKey (certificate)

        For server authentication, you can either rely on the
        implicit mutual authentication performed by SRP or
        you can do certificate-based server
        authentication with one of these argument combinations:

         - x509Fingerprint

        Certificate-based server authentication is compatible with
        SRP or certificate-based client authentication.

        The caller should be prepared to handle TLS-specific
        exceptions.  See the client handshake functions in
        :py:class:`~tlslite.tlsconnection.TLSConnection`
        for details on which
        exceptions might be raised.

        :type host: str
        :param host: Server to connect to.

        :type port: int
        :param port: Port to connect to.

        :type username: str
        :param username: SRP username.

        :type password: str
        :param password: SRP password for mutual authentication.
            Requires the 'username' argument.

        :type certChain: ~tlslite.x509certchain.X509CertChain
        :param certChain: Certificate chain for client authentication.
            Requires the 'privateKey' argument.  Excludes the SRP argument.

        :type privateKey: ~tlslite.utils.rsakey.RSAKey
        :param privateKey: Private key for client authentication.
            Requires the 'certChain' argument.  Excludes the SRP argument.

        :type checker: ~tlslite.checker.Checker
        :param checker: Callable object called after handshaking to
            evaluate the connection and raise an Exception if necessary.

        :type settings: ~tlslite.handshakesettings.HandshakeSettings
        :param settings: Various settings which can be used to control
            the ciphersuites, certificate types, and SSL/TLS versions
            offered by the client.
        """
        self.host = host
        self.port = port
        sock = socket.create_connection((host, port), timeout)
        ClientHelper.__init__(self,
                 username, password,
                 certChain, privateKey,
                 checker,
                 settings)
        connection = TLSConnection(sock) 
        ClientHelper._handshake(self, connection)
        self.sock = connection
        self.file = self.sock.makefile('rb')
        self._debugging = 0
        self.welcome = self._getresp()