Rev 3658: (Jelmer) Support GSSAPI authentication in FTP transport. in file:///home/pqm/archives/thelove/bzr/%2Btrunk/

Canonical.com Patch Queue Manager pqm at pqm.ubuntu.com
Thu Aug 28 18:17:54 BST 2008


At file:///home/pqm/archives/thelove/bzr/%2Btrunk/

------------------------------------------------------------
revno: 3658
revision-id: pqm at pqm.ubuntu.com-20080828171745-xdrmccm17muk77y0
parent: pqm at pqm.ubuntu.com-20080828152239-3cu7dhmjrk7zvs3f
parent: jelmer at samba.org-20080828164617-h4521ou3ay63q4m1
committer: Canonical.com Patch Queue Manager <pqm at pqm.ubuntu.com>
branch nick: +trunk
timestamp: Thu 2008-08-28 18:17:45 +0100
message:
  (Jelmer) Support GSSAPI authentication in FTP transport.
added:
  bzrlib/transport/ftp/          ftp-20080611185801-3vm145h8dmnfgh25-1
  bzrlib/transport/ftp/_gssapi.py _gssapi.py-20080611190840-7ejrtp884bk5eu72-2
renamed:
  bzrlib/transport/ftp.py => bzrlib/transport/ftp/__init__.py ftp.py-20051116161804-58dc9506548c2a53
modified:
  NEWS                           NEWS-20050323055033-4e00b5db738777ff
  bzrlib/transport/__init__.py   transport.py-20050711165921-4978aa7ce1285ad5
    ------------------------------------------------------------
    revno: 3649.3.6
    revision-id: jelmer at samba.org-20080828164617-h4521ou3ay63q4m1
    parent: jelmer at samba.org-20080828164420-vax88wymxd6an1bu
    committer: Jelmer Vernooij <jelmer at samba.org>
    branch nick: bzr.dev
    timestamp: Thu 2008-08-28 18:46:17 +0200
    message:
      Move NEWS item to DEVELOPMENT (was in 1.4).
    modified:
      NEWS                           NEWS-20050323055033-4e00b5db738777ff
    ------------------------------------------------------------
    revno: 3649.3.5
    revision-id: jelmer at samba.org-20080828164420-vax88wymxd6an1bu
    parent: jelmer at samba.org-20080828153904-ymlu7hg3ecq3dsyd
    committer: Jelmer Vernooij <jelmer at samba.org>
    branch nick: bzr.dev
    timestamp: Thu 2008-08-28 18:44:20 +0200
    message:
      use startswith.
    modified:
      bzrlib/transport/ftp/_gssapi.py _gssapi.py-20080611190840-7ejrtp884bk5eu72-2
    ------------------------------------------------------------
    revno: 3649.3.4
    revision-id: jelmer at samba.org-20080828153904-ymlu7hg3ecq3dsyd
    parent: jelmer at samba.org-20080828153134-qt2l5ogkn0xd9f6y
    parent: pqm at pqm.ubuntu.com-20080828152239-3cu7dhmjrk7zvs3f
    committer: Jelmer Vernooij <jelmer at samba.org>
    branch nick: bzr.dev
    timestamp: Thu 2008-08-28 17:39:04 +0200
    message:
      Merge bzr.dev.
    modified:
      NEWS                           NEWS-20050323055033-4e00b5db738777ff
      bzrlib/_patiencediff_c.c       _patiencediff_c.c-20070721205602-q3imkipwlgagp3cy-1
      bzrlib/btree_index.py          index.py-20080624222253-p0x5f92uyh5hw734-7
      bzrlib/chunk_writer.py         chunk_writer.py-20080630234519-6ggn4id17nipovny-1
      bzrlib/log.py                  log.py-20050505065812-c40ce11702fe5fb1
      bzrlib/plugin.py               plugin.py-20050622060424-829b654519533d69
      bzrlib/tests/test_btree_index.py test_index.py-20080624222253-p0x5f92uyh5hw734-13
      bzrlib/tests/test_chunk_writer.py test_chunk_writer.py-20080630234519-6ggn4id17nipovny-2
      bzrlib/tests/test_diff.py      testdiff.py-20050727164403-d1a3496ebb12e339
      bzrlib/tests/test_log.py       testlog.py-20050728115707-1a514809d7d49309
      bzrlib/tests/test_pack_repository.py test_pack_repository-20080801043947-eaw0e6h2gu75kwmy-1
      bzrlib/transport/http/_pycurl.py pycurlhttp.py-20060110060940-4e2a705911af77a6
      bzrlib/workingtree.py          workingtree.py-20050511021032-29b6ec0a681e02e3
    ------------------------------------------------------------
    revno: 3649.3.3
    revision-id: jelmer at samba.org-20080828153134-qt2l5ogkn0xd9f6y
    parent: jelmer at samba.org-20080828150141-1xpxelrida0uhc9j
    committer: Jelmer Vernooij <jelmer at samba.org>
    branch nick: bzr.dev
    timestamp: Thu 2008-08-28 17:31:34 +0200
    message:
      Review feedback from John.
    modified:
      bzrlib/transport/__init__.py   transport.py-20050711165921-4978aa7ce1285ad5
      bzrlib/transport/ftp/_gssapi.py _gssapi.py-20080611190840-7ejrtp884bk5eu72-2
    ------------------------------------------------------------
    revno: 3649.3.2
    revision-id: jelmer at samba.org-20080828150141-1xpxelrida0uhc9j
    parent: jelmer at samba.org-20080827203222-pr2ssub113o4q5lk
    parent: jelmer at samba.org-20080702230908-so8hndobqj9jygj4
    committer: Jelmer Vernooij <jelmer at samba.org>
    branch nick: bzr.dev
    timestamp: Thu 2008-08-28 17:01:41 +0200
    message:
      Merge GSSAPI patch.
    added:
      bzrlib/transport/ftp/          ftp-20080611185801-3vm145h8dmnfgh25-1
      bzrlib/transport/ftp/_gssapi.py _gssapi.py-20080611190840-7ejrtp884bk5eu72-2
    renamed:
      bzrlib/transport/ftp.py => bzrlib/transport/ftp/__init__.py ftp.py-20051116161804-58dc9506548c2a53
    modified:
      NEWS                           NEWS-20050323055033-4e00b5db738777ff
      bzrlib/transport/__init__.py   transport.py-20050711165921-4978aa7ce1285ad5
    ------------------------------------------------------------
    revno: 3331.2.11
    revision-id: jelmer at samba.org-20080702230908-so8hndobqj9jygj4
    parent: jelmer at samba.org-20080612214904-2vq5150j8wm2othn
    committer: Jelmer Vernooij <jelmer at samba.org>
    branch nick: ftp-krb5
    timestamp: Thu 2008-07-03 01:09:08 +0200
    message:
      Review comments from Martin.
    modified:
      bzrlib/transport/__init__.py   transport.py-20050711165921-4978aa7ce1285ad5
      bzrlib/transport/ftp/_gssapi.py _gssapi.py-20080611190840-7ejrtp884bk5eu72-2
    ------------------------------------------------------------
    revno: 3331.2.10
    revision-id: jelmer at samba.org-20080612214904-2vq5150j8wm2othn
    parent: jelmer at samba.org-20080611214357-scdwovuhubt4tvt6
    committer: Jelmer Vernooij <jelmer at samba.org>
    branch nick: ftp-krb5
    timestamp: Thu 2008-06-12 23:49:04 +0200
    message:
      Review feedback from Vincent.
    modified:
      bzrlib/transport/ftp/_gssapi.py _gssapi.py-20080611190840-7ejrtp884bk5eu72-2
    ------------------------------------------------------------
    revno: 3331.2.9
    revision-id: jelmer at samba.org-20080611214357-scdwovuhubt4tvt6
    parent: jelmer at samba.org-20080611212911-wszhwsqtn3bbz6a2
    committer: Jelmer Vernooij <jelmer at samba.org>
    branch nick: ftp-krb5
    timestamp: Wed 2008-06-11 23:43:57 +0200
    message:
      Fix PEP8-ness.
    modified:
      bzrlib/transport/ftp/_gssapi.py _gssapi.py-20080611190840-7ejrtp884bk5eu72-2
    ------------------------------------------------------------
    revno: 3331.2.8
    revision-id: jelmer at samba.org-20080611212911-wszhwsqtn3bbz6a2
    parent: jelmer at samba.org-20080611211522-cmd25uirlv1ww6e7
    committer: Jelmer Vernooij <jelmer at samba.org>
    branch nick: ftp-krb5
    timestamp: Wed 2008-06-11 23:29:11 +0200
    message:
      Run regular FTP tests against SecureFTP transport.
    modified:
      bzrlib/transport/ftp/_gssapi.py _gssapi.py-20080611190840-7ejrtp884bk5eu72-2
    ------------------------------------------------------------
    revno: 3331.2.7
    revision-id: jelmer at samba.org-20080611211522-cmd25uirlv1ww6e7
    parent: jelmer at samba.org-20080611193913-qw02j63yrweairuk
    committer: Jelmer Vernooij <jelmer at samba.org>
    branch nick: ftp-krb5
    timestamp: Wed 2008-06-11 23:15:22 +0200
    message:
      Fix handling of multilines.
    modified:
      bzrlib/transport/ftp/_gssapi.py _gssapi.py-20080611190840-7ejrtp884bk5eu72-2
    ------------------------------------------------------------
    revno: 3331.2.6
    revision-id: jelmer at samba.org-20080611193913-qw02j63yrweairuk
    parent: jelmer at samba.org-20080611192110-531pd5h9cjrhjxlh
    committer: Jelmer Vernooij <jelmer at samba.org>
    branch nick: ftp-krb5
    timestamp: Wed 2008-06-11 21:39:13 +0200
    message:
      Fix formatting, check for completeness of kerberos functions.
    modified:
      bzrlib/transport/ftp/_gssapi.py _gssapi.py-20080611190840-7ejrtp884bk5eu72-2
    ------------------------------------------------------------
    revno: 3331.2.5
    revision-id: jelmer at samba.org-20080611192110-531pd5h9cjrhjxlh
    parent: jelmer at samba.org-20080611192024-e7l1vrflhissbd17
    parent: pqm at pqm.ubuntu.com-20080611120348-tqhq37qvfz624jyb
    committer: Jelmer Vernooij <jelmer at samba.org>
    branch nick: ftp-krb5
    timestamp: Wed 2008-06-11 21:21:10 +0200
    message:
      Merge bzr.dev.
    removed:
      bzrlib/xml6.py                 xml6.py-20060823042456-dbaaq4atrche7xy5-1
    added:
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      bzrlib/tests/per_repository_reference/test_add_inventory.py test_add_inventory.p-20080220025549-nnm2s80it1lvcwnc-3
      bzrlib/tests/per_repository_reference/test_add_revision.py test_add_revision.py-20080220034108-ao1u8qgakqbo5a08-1
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      bzrlib/tests/per_repository_reference/test_break_lock.py test_break_lock.py-20080220042825-1f48qmpnuqqp5wg2-1
      bzrlib/tests/per_repository_reference/test_check.py test_check.py-20080220044229-sxxe747gzi6q8fyv-1
      bzrlib/tests/repository_implementations/test_get_parent_map.py test_get_parent_map.-20080421172708-x1z6ot341osr0jq1-1
      bzrlib/tests/test_mutabletree.py test_mutabletree.py-20080405014429-2v0cdi3re320p8db-1
      bzrlib/xml5.py                 xml5.py-20080328030717-t9guwinq8hom0ar3-1
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      doc/developers/integration.txt integration.txt-20080404022341-2lorxocp1in07zij-1
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      doc/es/                        es-20080504181154-x2fm3oprvjohiz7n-1
      doc/es/guia-desarrollador/     guiadesarrollador-20080504181514-qlh50dq1mj769bic-1
      doc/es/guia-usuario/           guiausuario-20080504181514-qlh50dq1mj769bic-2
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      doc/es/mini-tutorial/          minitutorial-20080504181514-qlh50dq1mj769bic-3
      doc/es/mini-tutorial/index.txt index.txt-20080504182136-wmoc35u2t6kom8ca-1
      doc/es/notas-version/          notasversion-20080504181514-qlh50dq1mj769bic-4
      doc/es/referencia/             referencia-20080504181514-qlh50dq1mj769bic-5
      doc/es/referencia-rapida/      referenciarapida-20080504181514-qlh50dq1mj769bic-6
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      doc/index.es.txt               index.es.txt-20080506002113-aunzdhptcoc0h6hm-1
    renamed:
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      doc/en/user-guide/best_practice_intro.txt => doc/en/user-guide/part2_intro.txt best_practice_intro.-20071123154453-dk2mjhrg1vpjm5w2-1
      doc/en/user-guide/revnos.txt => doc/en/user-guide/zen.txt revnos.txt-20080111231928-pbntxea0ynh9ww1t-1
    modified:
      Makefile                       Makefile-20050805140406-d96e3498bb61c5bb
      NEWS                           NEWS-20050323055033-4e00b5db738777ff
      bzr                            bzr.py-20050313053754-5485f144c7006fa6
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      bzrlib/_dirstate_helpers_py.py _dirstate_helpers_py-20070710145033-90nz6cqglsk150jy-1
      bzrlib/_patiencediff_py.py     cdvdifflib.py-20051106064558-f8f8097fbf0db4e4
      bzrlib/add.py                  add.py-20050323030017-3a77d63feda58e33
      bzrlib/annotate.py             annotate.py-20050922133147-7c60541d2614f022
      bzrlib/atomicfile.py           atomicfile.py-20050509044450-dbd24e6c564f7c66
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      bzrlib/branch.py               branch.py-20050309040759-e4baf4e0d046576e
      bzrlib/builtins.py             builtins.py-20050830033751-fc01482b9ca23183
      bzrlib/bundle/bundle_data.py   read_changeset.py-20050619171944-c0d95aa685537640
      bzrlib/bundle/serializer/v08.py v06.py-20051119041339-ee43f97270b01823
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      bzrlib/bzrdir.py               bzrdir.py-20060131065624-156dfea39c4387cb
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      bzrlib/commit.py               commit.py-20050511101309-79ec1a0168e0e825
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    ------------------------------------------------------------
    revno: 3331.2.4
    revision-id: jelmer at samba.org-20080611192024-e7l1vrflhissbd17
    parent: jelmer at samba.org-20080611185819-o4shi1ranh9zh01e
    committer: Jelmer Vernooij <jelmer at samba.org>
    branch nick: ftp-krb5
    timestamp: Wed 2008-06-11 21:20:24 +0200
    message:
      Move GSSAPI support to a separate file.
    added:
      bzrlib/transport/ftp/_gssapi.py _gssapi.py-20080611190840-7ejrtp884bk5eu72-2
    modified:
      bzrlib/transport/__init__.py   transport.py-20050711165921-4978aa7ce1285ad5
      bzrlib/transport/ftp/__init__.py ftp.py-20051116161804-58dc9506548c2a53
    ------------------------------------------------------------
    revno: 3331.2.3
    revision-id: jelmer at samba.org-20080611185819-o4shi1ranh9zh01e
    parent: jelmer at samba.org-20080413225009-91fqa5j66urmck10
    committer: Jelmer Vernooij <jelmer at samba.org>
    branch nick: ftp-krb5
    timestamp: Wed 2008-06-11 20:58:19 +0200
    message:
      Move ftp transport into separate directory.
    added:
      bzrlib/transport/ftp/          ftp-20080611185801-3vm145h8dmnfgh25-1
    renamed:
      bzrlib/transport/ftp.py => bzrlib/transport/ftp/__init__.py ftp.py-20051116161804-58dc9506548c2a53
    ------------------------------------------------------------
    revno: 3331.2.2
    revision-id: jelmer at samba.org-20080413225009-91fqa5j66urmck10
    parent: jelmer at samba.org-20080403231741-tipeqxjj8ao0ge1o
    committer: Jelmer Vernooij <jelmer at samba.org>
    branch nick: ftp-krb5
    timestamp: Mon 2008-04-14 00:50:09 +0200
    message:
      Move GSSAPI bits to a separate class.
    modified:
      bzrlib/transport/ftp.py        ftp.py-20051116161804-58dc9506548c2a53
    ------------------------------------------------------------
    revno: 3331.2.1
    revision-id: jelmer at samba.org-20080403231741-tipeqxjj8ao0ge1o
    parent: pqm at pqm.ubuntu.com-20080403080121-tbx3clqp8wqe776c
    committer: Jelmer Vernooij <jelmer at samba.org>
    branch nick: ftp-krb5
    timestamp: Fri 2008-04-04 01:17:41 +0200
    message:
      Support GSSAPI authentication in the FTP transport.
    modified:
      NEWS                           NEWS-20050323055033-4e00b5db738777ff
      bzrlib/transport/ftp.py        ftp.py-20051116161804-58dc9506548c2a53
=== modified file 'NEWS'
--- a/NEWS	2008-08-28 15:22:39 +0000
+++ b/NEWS	2008-08-28 16:46:17 +0000
@@ -16,6 +16,11 @@
       them automatically, much as ``bzr add`` scans for new files that
       are not ignored and adds them automatically. (Robert Collins)
 
+  FEATURES
+
+    * Support for GSSAPI authentication when using FTP as documented in 
+      RFC2228. (Jelmer Vernooij, #49623)
+
   IMPROVEMENTS:
 
     * ``bzr init`` and ``bzr init-repo`` will now print out the same as

=== modified file 'bzrlib/transport/__init__.py'
--- a/bzrlib/transport/__init__.py	2008-06-24 22:53:43 +0000
+++ b/bzrlib/transport/__init__.py	2008-08-28 15:31:34 +0000
@@ -1722,6 +1722,25 @@
 register_transport_proto('aftp://', help="Access using active FTP.")
 register_lazy_transport('aftp://', 'bzrlib.transport.ftp', 'FtpTransport')
 
+# Default to trying GSSAPI authentication (if the kerberos module is available)
+register_transport_proto('ftp+gssapi://', register_netloc=True)
+register_lazy_transport('ftp+gssapi://', 'bzrlib.transport.ftp._gssapi', 
+                        'GSSAPIFtpTransport')
+register_transport_proto('aftp+gssapi://', register_netloc=True)
+register_lazy_transport('aftp+gssapi://', 'bzrlib.transport.ftp._gssapi', 
+                        'GSSAPIFtpTransport')
+register_transport_proto('ftp+nogssapi://', register_netloc=True)
+register_transport_proto('aftp+nogssapi://', register_netloc=True)
+
+register_lazy_transport('ftp://', 'bzrlib.transport.ftp._gssapi', 
+                        'GSSAPIFtpTransport')
+register_lazy_transport('aftp://', 'bzrlib.transport.ftp._gssapi', 
+                        'GSSAPIFtpTransport')
+register_lazy_transport('ftp+nogssapi://', 'bzrlib.transport.ftp', 
+                        'FtpTransport')
+register_lazy_transport('aftp+nogssapi://', 'bzrlib.transport.ftp', 
+                        'FtpTransport')
+
 register_transport_proto('memory://')
 register_lazy_transport('memory://', 'bzrlib.transport.memory',
                         'MemoryTransport')

=== added directory 'bzrlib/transport/ftp'
=== renamed file 'bzrlib/transport/ftp.py' => 'bzrlib/transport/ftp/__init__.py'
=== added file 'bzrlib/transport/ftp/_gssapi.py'
--- a/bzrlib/transport/ftp/_gssapi.py	1970-01-01 00:00:00 +0000
+++ b/bzrlib/transport/ftp/_gssapi.py	2008-08-28 16:44:20 +0000
@@ -0,0 +1,159 @@
+# Copyright (C) 2005, 2006, 2007, 2008 Canonical Ltd
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+"""Support for secure authentication using GSSAPI over FTP.
+
+See RFC2228 for details.
+"""
+
+import base64, ftplib, getpass, socket
+
+from bzrlib import (
+    config, 
+    errors,
+    )
+from bzrlib.trace import info, mutter
+from bzrlib.transport.ftp import FtpTransport
+from bzrlib.transport import register_transport_proto, register_transport
+
+try:
+    import kerberos
+except ImportError, e:
+    mutter('failed to import kerberos lib: %s', e)
+    raise errors.DependencyNotPresent('kerberos', e)
+
+if getattr(kerberos, "authGSSClientWrap", None) is None:
+    raise errors.DependencyNotPresent('kerberos', 
+        "missing encryption function authGSSClientWrap")
+
+
+class GSSAPIFtp(ftplib.FTP):
+    """Extended version of ftplib.FTP that can authenticate using GSSAPI."""
+
+    def mic_putcmd(self, line):
+        rc = kerberos.authGSSClientWrap(self.vc, 
+            base64.b64encode(line), kerberos.authGSSClientUserName(self.vc))
+        wrapped = kerberos.authGSSClientResponse(self.vc)
+        ftplib.FTP.putcmd(self, "MIC " + wrapped)
+
+    def mic_getline(self):
+        resp = ftplib.FTP.getline(self)
+        if resp[:4] != '631 ':
+            raise AssertionError
+        rc = kerberos.authGSSClientUnwrap(self.vc, resp[4:].strip("\r\n"))
+        response = base64.b64decode(kerberos.authGSSClientResponse(self.vc))
+        return response
+
+    def gssapi_login(self, user):
+        # Try GSSAPI login first
+
+        # Used FTP response codes:
+        # 235 [ADAT=base64data] - indicates that the security data exchange 
+        #     completed successfully.
+        # 334 [ADAT=base64data] - indicates that the requested security 
+        #     mechanism is ok, and includes security data to be used by the 
+        #     client to construct the next command.
+        # 335 [ADAT=base64data] - indicates that the security data is
+        #     acceptable, and more is required to complete the security 
+        #     data exchange.
+
+        resp = self.sendcmd('AUTH GSSAPI')
+        if resp.startswith('334 '):
+            rc, self.vc = kerberos.authGSSClientInit("ftp@%s" % self.host)
+            if kerberos.authGSSClientStep(self.vc, "") != 1:
+                while resp[:4] in ('334 ', '335 '):
+                    authdata = kerberos.authGSSClientResponse(self.vc)
+                    resp = self.sendcmd('ADAT ' + authdata)
+                    if resp[:9] in ('235 ADAT=', '335 ADAT='):
+                        rc = kerberos.authGSSClientStep(self.vc, resp[9:])
+                        if not ((resp.startswith('235 ') and rc == 1) or 
+                                (resp.startswith('335 ') and rc == 0)):
+                            raise ftplib.error_reply, resp
+            info("Authenticated as %s" % kerberos.authGSSClientUserName(
+                    self.vc))
+
+            # Monkey patch ftplib
+            self.putcmd = self.mic_putcmd
+            self.getline = self.mic_getline
+            self.sendcmd('USER ' + user)
+            return resp
+        mutter("Unable to use GSSAPI authentication: %s", resp)
+
+
+class GSSAPIFtpTransport(FtpTransport):
+    """FTP transport implementation that will try to use GSSAPI authentication.
+
+    """
+
+    def _create_connection(self, credentials=None):
+        """Create a new connection with the provided credentials.
+
+        :param credentials: The credentials needed to establish the connection.
+
+        :return: The created connection and its associated credentials.
+
+        The credentials are a tuple with the username and password. The 
+        password is used if GSSAPI Authentication is not available.
+
+        The username and password can both be None, in which case the 
+        credentials specified in the URL or provided by the 
+        AuthenticationConfig() are used.
+        """
+        if credentials is None:
+            user, password = self._user, self._password
+        else:
+            user, password = credentials
+
+        auth = config.AuthenticationConfig()
+        if user is None:
+            user = auth.get_user('ftp', self._host, port=self._port)
+            if user is None:
+                # Default to local user
+                user = getpass.getuser()
+
+        mutter("Constructing FTP instance against %r" %
+               ((self._host, self._port, user, '********',
+                self.is_active),))
+        try:
+            connection = GSSAPIFtp()
+            connection.connect(host=self._host, port=self._port)
+            try:
+                connection.gssapi_login(user=user)
+            except ftplib.error_perm, e:
+                if user and user != 'anonymous' and \
+                        password is None: # '' is a valid password
+                    password = auth.get_password('ftp', self._host, user,
+                                                 port=self._port)
+                connection.login(user=user, passwd=password)
+            connection.set_pasv(not self.is_active)
+        except socket.error, e:
+            raise errors.SocketConnectionError(self._host, self._port,
+                                               msg='Unable to connect to',
+                                               orig_error= e)
+        except ftplib.error_perm, e:
+            raise errors.TransportError(msg="Error setting up connection:"
+                                        " %s" % str(e), orig_error=e)
+        return connection, (user, password)
+
+
+def get_test_permutations():
+    """Return the permutations to be used in testing."""
+    from bzrlib import tests
+    if tests.FTPServerFeature.available():
+        from bzrlib.tests import ftp_server
+        return [(GSSAPIFtpTransport, ftp_server.FTPServer)]
+    else:
+        return []




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