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# Copyright (C) 2013-2014 science + computing ag
# Author: Sebastian Deiss <sebastian.deiss@t-online.de>
#
#
# This file is part of paramiko.
#
# Paramiko is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2.1 of the License, or (at your option)
# any later version.
#
# Paramiko is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.

"""
This module provides GSS-API / SSPI  authentication as defined in :rfc:`4462`.

.. note:: Credential delegation is not supported in server mode.

.. seealso:: :doc:`/api/kex_gss`

.. versionadded:: 1.15
"""

import struct
import os
import sys

"""
:var bool GSS_AUTH_AVAILABLE:
    Constraint that indicates if GSS-API / SSPI is available.
"""
GSS_AUTH_AVAILABLE = True

try:
    from pyasn1.type.univ import ObjectIdentifier
    from pyasn1.codec.der import encoder, decoder
except ImportError:
    GSS_AUTH_AVAILABLE = False
    class ObjectIdentifier(object):
        def __init__(self, *args):
            raise NotImplementedError("Module pyasn1 not importable")

class decoder(object):
        def decode(self):
            raise NotImplementedError("Module pyasn1 not importable")

class encoder(object):
        def encode(self):
            raise NotImplementedError("Module pyasn1 not importable")

from paramiko.common import MSG_USERAUTH_REQUEST
from paramiko.ssh_exception import SSHException

"""
:var str _API: Constraint for the used API
"""
_API = "MIT"

try:
    import gssapi
except (ImportError, OSError):
    try:
        import sspicon
        import sspi
        _API = "SSPI"
    except ImportError:
        GSS_AUTH_AVAILABLE = False
        _API = None

def GSSAuth(auth_method, gss_deleg_creds=True):
    """
    Provide SSH2 GSS-API / SSPI authentication.

:param str auth_method: The name of the SSH authentication mechanism
                            (gssapi-with-mic or gss-keyex)
    :param bool gss_deleg_creds: Delegate client credentials or not.
                                 We delegate credentials by default.
    :return: Either an `._SSH_GSSAPI` (Unix) object or an
             `_SSH_SSPI` (Windows) object
    :rtype: Object

:raise ImportError: If no GSS-API / SSPI module could be imported.

:see: `RFC 4462 <http://www.ietf.org/rfc/rfc4462.txt>`_
    :note: Check for the available API and return either an `._SSH_GSSAPI`
           (MIT GSSAPI) object or an `._SSH_SSPI` (MS SSPI) object. If you
           get python-gssapi working on Windows, python-gssapi
           will be used and a `._SSH_GSSAPI` object will be returned.
           If there is no supported API available,
           ``None`` will be returned.
    """
    if _API == "MIT":
        return _SSH_GSSAPI(auth_method, gss_deleg_creds)
    elif _API == "SSPI" and os.name == "nt":
        return _SSH_SSPI(auth_method, gss_deleg_creds)
    else:
        raise ImportError("Unable to import a GSS-API / SSPI module!")

class _SSH_GSSAuth(object):
    """
    Contains the shared variables and methods of `._SSH_GSSAPI` and
    `._SSH_SSPI`.
    """
    def __init__(self, auth_method, gss_deleg_creds):
        """
        :param str auth_method: The name of the SSH authentication mechanism
                                (gssapi-with-mic or gss-keyex)
        :param bool gss_deleg_creds: Delegate client credentials or not
        """
        self._auth_method = auth_method
        self._gss_deleg_creds = gss_deleg_creds
        self._gss_host = None
        self._username = None
        self._session_id = None
        self._service = "ssh-connection"
        """
        OpenSSH supports Kerberos V5 mechanism only for GSS-API authentication,
        so we also support the krb5 mechanism only.
        """
        self._krb5_mech = "1.2.840.113554.1.2.2"

# client mode
        self._gss_ctxt = None
        self._gss_ctxt_status = False

# server mode
        self._gss_srv_ctxt = None
        self._gss_srv_ctxt_status = False
        self.cc_file = None

def set_service(self, service):
        """
        This is just a setter to use a non default service.
        I added this method, because RFC 4462 doesn't specify "ssh-connection"
        as the only service value.

:param str service: The desired SSH service
        :rtype: Void
        """
        if service.find("ssh-"):
            self._service = service

def set_username(self, username):
        """
        Setter for C{username}. If GSS-API Key Exchange is performed, the
        username is not set by C{ssh_init_sec_context}.

:param str username: The name of the user who attempts to login
        :rtype: Void
        """
        self._username = username

def ssh_gss_oids(self, mode="client"):
        """
        This method returns a single OID, because we only support the
        Kerberos V5 mechanism.

:param str mode: Client for client mode and server for server mode
        :return: A byte sequence containing the number of supported
                 OIDs, the length of the OID and the actual OID encoded with
                 DER
        :rtype: Bytes
        :note: In server mode we just return the OID length and the DER encoded
               OID.
        """
        OIDs = self._make_uint32(1)
        krb5_OID = encoder.encode(ObjectIdentifier(self._krb5_mech))
        OID_len = self._make_uint32(len(krb5_OID))
        if mode == "server":
            return OID_len + krb5_OID
        return OIDs + OID_len + krb5_OID

def ssh_check_mech(self, desired_mech):
        """
        Check if the given OID is the Kerberos V5 OID (server mode).

:param str desired_mech: The desired GSS-API mechanism of the client
        :return: ``True`` if the given OID is supported, otherwise C{False}
        :rtype: Boolean
        """
        mech, __ = decoder.decode(desired_mech)
        if mech.__str__() != self._krb5_mech:
            return False
        return True

# Internals
    #--------------------------------------------------------------------------
    def _make_uint32(self, integer):
        """
        Create a 32 bit unsigned integer (The byte sequence of an integer).

:param int integer: The integer value to convert
        :return: The byte sequence of an 32 bit integer
        :rtype: Bytes
        """
        return struct.pack("!I", integer)

def _ssh_build_mic(self, session_id, username, service, auth_method):
        """
        Create the SSH2 MIC filed for gssapi-with-mic.

:param str session_id: The SSH session ID
        :param str username: The name of the user who attempts to login
        :param str service: The requested SSH service
        :param str auth_method: The requested SSH authentication mechanism
        :return: The MIC as defined in RFC 4462. The contents of the
                 MIC field are:
                 string    session_identifier,
                 byte      SSH_MSG_USERAUTH_REQUEST,
                 string    user-name,
                 string    service (ssh-connection),
                 string    authentication-method
                           (gssapi-with-mic or gssapi-keyex)
        :rtype: Bytes
        """
        mic = self._make_uint32(len(session_id))
        mic += session_id
        mic += struct.pack('B', MSG_USERAUTH_REQUEST)
        mic += self._make_uint32(len(username))
        mic += username.encode()
        mic += self._make_uint32(len(service))
        mic += service.encode()
        mic += self._make_uint32(len(auth_method))
        mic += auth_method.encode()
        return mic

class _SSH_GSSAPI(_SSH_GSSAuth):
    """
    Implementation of the GSS-API MIT Kerberos Authentication for SSH2.

:see: `.GSSAuth`
    """
    def __init__(self, auth_method, gss_deleg_creds):
        """
        :param str auth_method: The name of the SSH authentication mechanism
                                (gssapi-with-mic or gss-keyex)
        :param bool gss_deleg_creds: Delegate client credentials or not
        """
        _SSH_GSSAuth.__init__(self, auth_method, gss_deleg_creds)

if self._gss_deleg_creds:
            self._gss_flags = (gssapi.C_PROT_READY_FLAG,
                               gssapi.C_INTEG_FLAG,
                               gssapi.C_MUTUAL_FLAG,
                               gssapi.C_DELEG_FLAG)
        else:
            self._gss_flags = (gssapi.C_PROT_READY_FLAG,
                               gssapi.C_INTEG_FLAG,
                               gssapi.C_MUTUAL_FLAG)

def ssh_init_sec_context(self, target, desired_mech=None,
                             username=None, recv_token=None):
        """
        Initialize a GSS-API context.

:param str username: The name of the user who attempts to login
        :param str target: The hostname of the target to connect to
        :param str desired_mech: The negotiated GSS-API mechanism
                                 ("pseudo negotiated" mechanism, because we
                                 support just the krb5 mechanism :-))
        :param str recv_token: The GSS-API token received from the Server
        :raise SSHException: Is raised if the desired mechanism of the client
                             is not supported
        :return: A ``String`` if the GSS-API has returned a token or ``None`` if
                 no token was returned
        :rtype: String or None
        """
        self._username = username
        self._gss_host = target
        targ_name = gssapi.Name("host@" + self._gss_host,
                                gssapi.C_NT_HOSTBASED_SERVICE)
        ctx = gssapi.Context()
        ctx.flags = self._gss_flags
        if desired_mech is None:
            krb5_mech = gssapi.OID.mech_from_string(self._krb5_mech)
        else:
            mech, __ = decoder.decode(desired_mech)
            if mech.__str__() != self._krb5_mech:
                raise SSHException("Unsupported mechanism OID.")
            else:
                krb5_mech = gssapi.OID.mech_from_string(self._krb5_mech)
        token = None
        try:
            if recv_token is None:
                self._gss_ctxt = gssapi.InitContext(peer_name=targ_name,
                                                    mech_type=krb5_mech,
                                                    req_flags=ctx.flags)
                token = self._gss_ctxt.step(token)
            else:
                token = self._gss_ctxt.step(recv_token)
        except gssapi.GSSException:
            raise gssapi.GSSException("{0} Target: {1}".format(sys.exc_info()[1],
                                                               self._gss_host))
        self._gss_ctxt_status = self._gss_ctxt.established
        return token

def ssh_get_mic(self, session_id, gss_kex=False):
        """
        Create the MIC token for a SSH2 message.

:param str session_id: The SSH session ID
        :param bool gss_kex: Generate the MIC for GSS-API Key Exchange or not
        :return: gssapi-with-mic:
                 Returns the MIC token from GSS-API for the message we created
                 with ``_ssh_build_mic``.
                 gssapi-keyex:
                 Returns the MIC token from GSS-API with the SSH session ID as
                 message.
        :rtype: String
        :see: `._ssh_build_mic`
        """
        self._session_id = session_id
        if not gss_kex:
            mic_field = self._ssh_build_mic(self._session_id,
                                            self._username,
                                            self._service,
                                            self._auth_method)
            mic_token = self._gss_ctxt.get_mic(mic_field)
        else:
            # for key exchange with gssapi-keyex
            mic_token = self._gss_srv_ctxt.get_mic(self._session_id)
        return mic_token

def ssh_accept_sec_context(self, hostname, recv_token, username=None):
        """
        Accept a GSS-API context (server mode).

:param str hostname: The servers hostname
        :param str username: The name of the user who attempts to login
        :param str recv_token: The GSS-API Token received from the server,
                               if it's not the initial call.
        :return: A ``String`` if the GSS-API has returned a token or ``None``
                if no token was returned
        :rtype: String or None
        """
        # hostname and username are not required for GSSAPI, but for SSPI
        self._gss_host = hostname
        self._username = username
        if self._gss_srv_ctxt is None:
            self._gss_srv_ctxt = gssapi.AcceptContext()
        token = self._gss_srv_ctxt.step(recv_token)
        self._gss_srv_ctxt_status = self._gss_srv_ctxt.established
        return token

def ssh_check_mic(self, mic_token, session_id, username=None):
        """
        Verify the MIC token for a SSH2 message.

:param str mic_token: The MIC token received from the client
        :param str session_id: The SSH session ID
        :param str username: The name of the user who attempts to login
        :return: None if the MIC check was successful
        :raises gssapi.GSSException: if the MIC check failed
        """
        self._session_id = session_id
        self._username = username
        if self._username is not None:
            # server mode
            mic_field = self._ssh_build_mic(self._session_id,
                                        self._username,
                                        self._service,
                                        self._auth_method)
            self._gss_srv_ctxt.verify_mic(mic_field, mic_token)
        else:
            # for key exchange with gssapi-keyex
            # client mode
            self._gss_ctxt.verify_mic(self._session_id,
                                      mic_token)

@property
    def credentials_delegated(self):
        """
        Checks if credentials are delegated (server mode).

:return: ``True`` if credentials are delegated, otherwise ``False``
        :rtype: bool
        """
        if self._gss_srv_ctxt.delegated_cred is not None:
            return True
        return False

def save_client_creds(self, client_token):
        """
        Save the Client token in a file. This is used by the SSH server
        to store the client credentials if credentials are delegated
        (server mode).

:param str client_token: The GSS-API token received form the client
        :raise NotImplementedError: Credential delegation is currently not
                                    supported in server mode
        """
        raise NotImplementedError

class _SSH_SSPI(_SSH_GSSAuth):
    """
    Implementation of the Microsoft SSPI Kerberos Authentication for SSH2.

if self._gss_deleg_creds:
            self._gss_flags = sspicon.ISC_REQ_INTEGRITY |\
                              sspicon.ISC_REQ_MUTUAL_AUTH |\
                              sspicon.ISC_REQ_DELEGATE
        else:
            self._gss_flags = sspicon.ISC_REQ_INTEGRITY |\
                              sspicon.ISC_REQ_MUTUAL_AUTH

def ssh_init_sec_context(self, target, desired_mech=None,
                             username=None, recv_token=None):
        """
        Initialize a SSPI context.

:param str username: The name of the user who attempts to login
        :param str target: The FQDN of the target to connect to
        :param str desired_mech: The negotiated SSPI mechanism
                                 ("pseudo negotiated" mechanism, because we
                                 support just the krb5 mechanism :-))
        :param recv_token: The SSPI token received from the Server
        :raise SSHException: Is raised if the desired mechanism of the client
                             is not supported
        :return: A ``String`` if the SSPI has returned a token or ``None`` if
                 no token was returned
        :rtype: String or None
        """
        self._username = username
        self._gss_host = target
        error = 0
        targ_name = "host/" + self._gss_host
        if desired_mech is not None:
            mech, __ = decoder.decode(desired_mech)
            if mech.__str__() != self._krb5_mech:
                raise SSHException("Unsupported mechanism OID.")
        try:
            if recv_token is None:
                self._gss_ctxt = sspi.ClientAuth("Kerberos",
                                                 scflags=self._gss_flags,
                                                 targetspn=targ_name)
            error, token = self._gss_ctxt.authorize(recv_token)
            token = token[0].Buffer
        except:
            raise Exception("{0}, Target: {1}".format(sys.exc_info()[1],
                                                      self._gss_host))
        if error == 0:
            """
            if the status is GSS_COMPLETE (error = 0) the context is fully
            established an we can set _gss_ctxt_status to True.
            """
            self._gss_ctxt_status = True
            token = None
            """
            You won't get another token if the context is fully established,
            so i set token to None instead of ""
            """
        return token

def ssh_get_mic(self, session_id, gss_kex=False):
        """
        Create the MIC token for a SSH2 message.

:param str session_id: The SSH session ID
        :param bool gss_kex: Generate the MIC for Key Exchange with SSPI or not
        :return: gssapi-with-mic:
                 Returns the MIC token from SSPI for the message we created
                 with ``_ssh_build_mic``.
                 gssapi-keyex:
                 Returns the MIC token from SSPI with the SSH session ID as
                 message.
        :rtype: String
        :see: `._ssh_build_mic`
        """
        self._session_id = session_id
        if not gss_kex:
            mic_field = self._ssh_build_mic(self._session_id,
                                            self._username,
                                            self._service,
                                            self._auth_method)
            mic_token = self._gss_ctxt.sign(mic_field)
        else:
            # for key exchange with gssapi-keyex
            mic_token = self._gss_srv_ctxt.sign(self._session_id)
        return mic_token

def ssh_accept_sec_context(self, hostname, username, recv_token):
        """
        Accept a SSPI context (server mode).

:param str hostname: The servers FQDN
        :param str username: The name of the user who attempts to login
        :param str recv_token: The SSPI Token received from the server,
                               if it's not the initial call.
        :return: A ``String`` if the SSPI has returned a token or ``None`` if
                 no token was returned
        :rtype: String or None
        """
        self._gss_host = hostname
        self._username = username
        targ_name = "host/" + self._gss_host
        self._gss_srv_ctxt = sspi.ServerAuth("Kerberos", spn=targ_name)
        error, token = self._gss_srv_ctxt.authorize(recv_token)
        token = token[0].Buffer
        if error == 0:
            self._gss_srv_ctxt_status = True
            token = None
        return token

def ssh_check_mic(self, mic_token, session_id, username=None):
        """
        Verify the MIC token for a SSH2 message.

:param str mic_token: The MIC token received from the client
        :param str session_id: The SSH session ID
        :param str username: The name of the user who attempts to login
        :return: None if the MIC check was successful
        :raises sspi.error: if the MIC check failed
        """
        self._session_id = session_id
        self._username = username
        if username is not None:
            # server mode
            mic_field = self._ssh_build_mic(self._session_id,
                                            self._username,
                                            self._service,
                                            self._auth_method)
            # Verifies data and its signature.  If verification fails, an 
            # sspi.error will be raised.
            self._gss_srv_ctxt.verify(mic_field, mic_token)
        else:
            # for key exchange with gssapi-keyex
            # client mode
            # Verifies data and its signature.  If verification fails, an 
            # sspi.error will be raised.
            self._gss_ctxt.verify(self._session_id, mic_token)

@property
    def credentials_delegated(self):
        """
        Checks if credentials are delegated (server mode).

:return: ``True`` if credentials are delegated, otherwise ``False``
        :rtype: Boolean
        """
        return (
                self._gss_flags & sspicon.ISC_REQ_DELEGATE
                ) and (
                self._gss_srv_ctxt_status or (self._gss_flags)
           )

def save_client_creds(self, client_token):
        """
        Save the Client token in a file. This is used by the SSH server
        to store the client credentails if credentials are delegated
        (server mode).

:param str client_token: The SSPI token received form the client
        :raise NotImplementedError: Credential delegation is currently not
                                    supported in server mode
        """
        raise NotImplementedError

Type	Name	options
	__init__.py
	__init__.pyc
	__init__.pyo
	_version.py
	_version.pyc
	_version.pyo
	_winapi.py
	_winapi.pyc
	_winapi.pyo
	agent.py
	agent.pyc
	agent.pyo
	auth_handler.py
	auth_handler.pyc
	auth_handler.pyo
	ber.py
	ber.pyc
	ber.pyo
	buffered_pipe.py
	buffered_pipe.pyc
	buffered_pipe.pyo
	channel.py
	channel.pyc
	channel.pyo
	client.py
	client.pyc
	client.pyo
	common.py
	common.pyc
	common.pyo
	compress.py
	compress.pyc
	compress.pyo
	config.py
	config.pyc
	config.pyo
	dsskey.py
	dsskey.pyc
	dsskey.pyo
	ecdsakey.py
	ecdsakey.pyc
	ecdsakey.pyo
	file.py
	file.pyc
	file.pyo
	hostkeys.py
	hostkeys.pyc
	hostkeys.pyo
	kex_gex.py
	kex_gex.pyc
	kex_gex.pyo
	kex_group1.py
	kex_group1.pyc
	kex_group1.pyo
	kex_group14.py
	kex_group14.pyc
	kex_group14.pyo
	kex_gss.py
	kex_gss.pyc
	kex_gss.pyo
	message.py
	message.pyc
	message.pyo
	packet.py
	packet.pyc
	packet.pyo
	pipe.py
	pipe.pyc
	pipe.pyo
	pkey.py
	pkey.pyc
	pkey.pyo
	primes.py
	primes.pyc
	primes.pyo
	proxy.py
	proxy.pyc
	proxy.pyo
	py3compat.py
	py3compat.pyc
	py3compat.pyo
	resource.py
	resource.pyc
	resource.pyo
	rsakey.py
	rsakey.pyc
	rsakey.pyo
	server.py
	server.pyc
	server.pyo
	sftp.py
	sftp.pyc
	sftp.pyo
	sftp_attr.py
	sftp_attr.pyc
	sftp_attr.pyo
	sftp_client.py
	sftp_client.pyc
	sftp_client.pyo
	sftp_file.py
	sftp_file.pyc
	sftp_file.pyo
	sftp_handle.py
	sftp_handle.pyc
	sftp_handle.pyo
	sftp_server.py
	sftp_server.pyc
	sftp_server.pyo
	sftp_si.py
	sftp_si.pyc
	sftp_si.pyo
	ssh_exception.py
	ssh_exception.pyc
	ssh_exception.pyo
	ssh_gss.py
	ssh_gss.pyc
	ssh_gss.pyo
	transport.py
	transport.pyc
	transport.pyo
	util.py
	util.pyc
	util.pyo
	win_pageant.py
	win_pageant.pyc
	win_pageant.pyo