Index: package_tags/xvm-authz-locker/0.0.2/debian/changelog
===================================================================
--- package_tags/xvm-authz-locker/0.0.2/debian/changelog	(revision 2771)
+++ package_tags/xvm-authz-locker/0.0.2/debian/changelog	(revision 2771)
@@ -0,0 +1,11 @@
+xvm-authz-locker (0.0.2) unstable; urgency=low
+
+  * Install the authz module as invirt.authz, instead of xvm.authz.locker
+
+ -- Evan Broder <broder@mit.edu>  Mon, 21 Dec 2009 16:24:05 -0600
+
+xvm-authz-locker (0.0.1) unstable; urgency=low
+
+  * Initial release.
+
+ -- Evan Broder <broder@mit.edu>  Tue, 15 Dec 2009 19:09:02 -0500
Index: package_tags/xvm-authz-locker/0.0.2/debian/compat
===================================================================
--- package_tags/xvm-authz-locker/0.0.2/debian/compat	(revision 2771)
+++ package_tags/xvm-authz-locker/0.0.2/debian/compat	(revision 2771)
@@ -0,0 +1,1 @@
+4
Index: package_tags/xvm-authz-locker/0.0.2/debian/control
===================================================================
--- package_tags/xvm-authz-locker/0.0.2/debian/control	(revision 2771)
+++ package_tags/xvm-authz-locker/0.0.2/debian/control	(revision 2771)
@@ -0,0 +1,18 @@
+Source: xvm-authz-locker
+Section: base
+Priority: extra
+Maintainer: Invirt project <invirt@mit.edu>
+Build-Depends: cdbs (>= 0.4.23-1.1), debhelper (>= 4.1.0), python-all-dev, python-support, python-setuptools, python-debian, python-apt
+Standards-Version: 3.8.0
+
+Package: xvm-authz-locker
+Architecture: all
+Depends: ${python:Depends}, ${misc:Depends}, invirt-base, python-afs
+Provides: ${python:Provides}, invirt-authz
+Conflicts: invirt-authz
+Replaces: invirt-authz
+Breaks: invirt-base (<< 0.0.28~)
+XB-Python-Version: ${python:Versions}
+Description: Authorization module for XVM
+ This package contains an authorization module for XVM. It supports
+ the locker authorization scheme.
Index: package_tags/xvm-authz-locker/0.0.2/debian/copyright
===================================================================
--- package_tags/xvm-authz-locker/0.0.2/debian/copyright	(revision 2771)
+++ package_tags/xvm-authz-locker/0.0.2/debian/copyright	(revision 2771)
@@ -0,0 +1,16 @@
+This software was written as part of the Invirt project <invirt@mit.edu>.
+
+Copyright :
+
+  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.
+
+On Debian systems, the complete text of the GNU General Public License
+can be found in the file /usr/share/common-licenses/GPL.
Index: package_tags/xvm-authz-locker/0.0.2/debian/pycompat
===================================================================
--- package_tags/xvm-authz-locker/0.0.2/debian/pycompat	(revision 2771)
+++ package_tags/xvm-authz-locker/0.0.2/debian/pycompat	(revision 2771)
@@ -0,0 +1,1 @@
+2
Index: package_tags/xvm-authz-locker/0.0.2/debian/pyversions
===================================================================
--- package_tags/xvm-authz-locker/0.0.2/debian/pyversions	(revision 2771)
+++ package_tags/xvm-authz-locker/0.0.2/debian/pyversions	(revision 2771)
@@ -0,0 +1,1 @@
+2.5-
Index: package_tags/xvm-authz-locker/0.0.2/debian/rules
===================================================================
--- package_tags/xvm-authz-locker/0.0.2/debian/rules	(revision 2771)
+++ package_tags/xvm-authz-locker/0.0.2/debian/rules	(revision 2771)
@@ -0,0 +1,9 @@
+#!/usr/bin/make -f
+
+DEB_PYTHON_SYSTEM=pysupport
+
+include /usr/share/cdbs/1/rules/debhelper.mk
+include /usr/share/cdbs/1/class/python-distutils.mk
+
+clean::
+	rm -rf python/xvm.authz.locker.egg-info
Index: package_tags/xvm-authz-locker/0.0.2/python/invirt/authz.py
===================================================================
--- package_tags/xvm-authz-locker/0.0.2/python/invirt/authz.py	(revision 2771)
+++ package_tags/xvm-authz-locker/0.0.2/python/invirt/authz.py	(revision 2771)
@@ -0,0 +1,132 @@
+import errno
+
+from afs import acl
+from afs import fs
+from afs import pts
+
+from invirt import common
+from invirt.config import structs as config
+from invirt import remctl
+
+
+#
+# expandOwner and expandAdmin form the API that needs to be exported
+# for all authz modules.
+#
+
+
+def expandOwner(name):
+    """Expand an owner to a list of authorized users.
+
+    For the locker authz module, an owner is an Athena locker. Those
+    users who have been given the administrator ('a') bit on the root
+    of a locker are given access to any VM owned by that locker,
+    unless they also have been given a negative administrator bit.
+
+    If a locker doesn't exist, or we can't access the permissions, we
+    assume the ACL is empty.
+    """
+    try:
+        path = _lockerPath(name)
+        cell = fs.whichcell(path)
+        auth = _authenticate(cell)
+        a = acl.ACL.retrieve(path)
+
+        allowed = set()
+        for ent in a.pos:
+            if a.pos[ent] & acl.ADMINISTER:
+                allowed.update(_expandGroup(ent, cell=cell, auth=auth))
+        for ent in a.neg:
+            if a.neg[ent] & acl.ADMINISTER:
+                allowed.difference_update(_expandGroup(ent, cell=cell, auth=auth))
+
+        return allowed
+    except OSError, e:
+        if e.errno in (errno.ENOENT, errno.EACCES):
+            return []
+        else:
+            raise
+
+
+def expandAdmin(name, owner):
+    """Expand an administrator to a list of authorized users.
+
+    Because the interpretation of an administrator might depend on the
+    owner, the owner is passed in as an argument.
+
+    However, in the case of locker-based authentication, the
+    administrator is always interpreted as an AFS entry (either a user
+    or a group) in the home cell (athena.mit.edu for XVM).
+    """
+    cell = config.authz.afs.cells[0].cell
+    auth = _authenticate(cell)
+    return _expandGroup(name, cell=cell, auth=auth)
+
+
+#
+# These are helper functions, and aren't part of the authz API
+#
+
+
+def _authenticate(cell):
+    """Acquire AFS tokens for a cell if encryption is required by config.
+
+    If the Invirt configuration requires connections to this cell to
+    be encrypted, acquires tokens and returns True. Otherwise, returns
+    False. Consumers of this function must still be sure to encrypt
+    their own connections if necessary.
+
+    Cells not listed in the Invirt configuration default to requiring
+    encryption in order to maintain security by default.
+
+    Due to AFS's cross-realm auto-PTS-creation mechanism, using
+    authenticated connections by default should only fail for cells
+    which authenticate directly against the machine's home realm and
+    cells distantly related to the machine's home realm.
+    """
+    for c in config.authz.afs.cells:
+        if c.cell == cell and not c.auth:
+            return False
+
+    remctl.checkKinit()
+    common.captureOutput(['aklog', '-c', cell])
+    return True
+
+
+def _expandGroup(name, cell=None, auth=False):
+    """Expand an AFS group into a list of its members.
+
+    Because groups are not global, but can vary from cell to cell,
+    this function accepts as an optional argument the cell in which
+    this group should be resolved.
+
+    If no cell is specified, it is assumed that the default cell (or
+    ThisCell) should be used.
+
+    If the name is a user, not a group, then a single-element set with
+    the same name is returned.
+
+    As with expandOwner, if a group doesn't exist or if we're unable
+    to retrieve its membership, we assume it's empty.
+    """
+    try:
+        ent = pts.PTS(cell, pts.PTS_ENCRYPT if auth else pts.PTS_UNAUTH).\
+            getEntry(name)
+        if ent.id > 0:
+            return set([ent.name])
+        else:
+            return set([x.name for x in ent.members])
+    except OSError, e:
+        if e.errno in (errno.ENOENT, errno.EACCESS):
+            return set()
+        else:
+            raise
+
+
+def _lockerPath(owner):
+    """Given the name of a locker, return a path to that locker.
+
+    This turns out to be pretty simple, thanks to the /mit
+    automounter.
+    """
+    return '/mit/%s' % owner
Index: package_tags/xvm-authz-locker/0.0.2/setup.py
===================================================================
--- package_tags/xvm-authz-locker/0.0.2/setup.py	(revision 2771)
+++ package_tags/xvm-authz-locker/0.0.2/setup.py	(revision 2771)
@@ -0,0 +1,28 @@
+#!/usr/bin/python
+
+from os import path
+from email.utils import parseaddr
+from glob import glob
+from setuptools import setup
+
+try:
+    from debian_bundle.changelog import Changelog
+    from debian_bundle.deb822 import Deb822
+    version = Changelog(open(path.join(path.dirname(__file__), 'debian/changelog')).read()).\
+        get_version().full_version
+
+    maintainer_full = Deb822(open(path.join(path.dirname(__file__), 'debian/control')))['Maintainer']
+    maintainer, maintainer_email = parseaddr(maintainer_full)
+except:
+    version = '0.0.0'
+    maintainer, maintainer_email = parseaddr('Invirt project <invirt@mit.edu>')
+
+setup(
+    name='xvm.authz.locker',
+    version=version,
+    maintainer=maintainer,
+    maintainer_email=maintainer_email,
+    
+    py_modules = ['invirt.authz'],
+    package_dir = {'': 'python'},
+)
