Rob Crittenden
4ad8055341
The new model is based on permssions, privileges and roles. Most importantly it corrects the reverse membership that caused problems in the previous implementation. You add permission to privileges and privileges to roles, not the other way around (even though it works that way behind the scenes). A permission object is a combination of a simple group and an aci. The linkage between the aci and the permission is the description of the permission. This shows as the name/description of the aci. ldap:///self and groups granting groups (v1-style) are not supported by this model (it will be provided separately). This makes the aci plugin internal only. ticket 445
766 lines
24 KiB
Python
766 lines
24 KiB
Python
# Authors:
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# Rob Crittenden <rcritten@redhat.com>
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# Pavel Zuna <pzuna@redhat.com>
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#
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# Copyright (C) 2009 Red Hat
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# see file 'COPYING' for use and warranty information
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; version 2 only
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""
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Directory Server Access Control Instructions (ACIs)
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ACIs are used to allow or deny access to information. This module is
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currently designed to allow, not deny, access.
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The aci commands are designed to grant permissions that allow updating
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existing entries or adding or deleting new ones. The goal of the ACIs
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that ship with IPA is to provide a set of low-level permissions that
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grant access to special groups called taskgroups. These low-level
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permissions can be combined into roles that grant broader access. These
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roles are another type of group, roles.
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For example, if you have taskgroups that allow adding and modifying users you
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could create a role, useradmin. You would assign users to the useradmin
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role to allow them to do the operations defined by the taskgroups.
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You can create ACIs that delegate permission so users in group A can write
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attributes on group B.
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The type option is a map that applies to all entries in the users, groups or
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host location. It is primarily designed to be used when granting add
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permissions (to write new entries).
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An ACI consists of three parts:
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1. target
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2. permissions
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3. bind rules
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The target is a set of rules that define which LDAP objects are being
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targetted. This can include a list of attributes, an area of that LDAP
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tree or an LDAP filter.
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The permissions define what the ACI is allowed to do, they are one or more
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of:
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1. write - write one or more attributes
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2. read - read one or more attributes
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3. add - add a new entry to the tree
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4. delete - delete an existing entry
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5. all - all permissions are granted
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Note the distinction between attributes and entries. The permissions are
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independent, so being able to add a user does not mean that the user will
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be editabe.
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The bind rule defines who this ACI grants permissions to. The LDAP server
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allows this to be any valid LDAP entry but we encourage the use of
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taskgroups so that the rights can be easily shared through roles.
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For a more thorough description of access controls see
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http://www.redhat.com/docs/manuals/dir-server/ag/8.0/Managing_Access_Control.html
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EXAMPLES:
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Add an ACI so that the group "secretaries" can update the address on any user:
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ipa aci-add --attrs=streetAddress --memberof=ipausers --group=secretaries --permissions=write "Secretaries write addresses"
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Show the new ACI:
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ipa aci-show "Secretaries write addresses"
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Add an ACI that allows members of the "addusers" taskgroup to add new users:
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ipa aci-add --type=user --taskgroup=addusers --permissions=add "Add new users"
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Add an ACI that lets members of the edotors manage members of the admins group:
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ipa aci-add --permissions=write --attrs=member --targetgroup=admins --group=editors "Editors manage admins"
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The show command shows the raw 389-ds ACI.
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IMPORTANT: When modifying the target attributes of an existing ACI you
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must include all existing attributes as well. When doing an aci-mod the
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targetattr REPLACES the current attributes, it does not add to them.
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"""
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from ipalib import api, crud, errors
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from ipalib import Object, Command
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from ipalib import Flag, Int, List, Str, StrEnum
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from ipalib.aci import ACI
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from ipalib import output
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from ipalib import _, ngettext
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import logging
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_type_map = {
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'user': 'ldap:///uid=*,%s,%s' % (api.env.container_user, api.env.basedn),
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'group': 'ldap:///cn=*,%s,%s' % (api.env.container_group, api.env.basedn),
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'host': 'ldap:///fqdn=*,%s,%s' % (api.env.container_host, api.env.basedn),
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'hostgroup': 'ldap:///cn=*,%s,%s' % (api.env.container_hostgroup, api.env.basedn),
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'service': 'ldap:///krbprincipalname=*,%s,%s' % (api.env.container_service, api.env.basedn),
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'netgroup': 'ldap:///ipauniqueid=*,%s,%s' % (api.env.container_netgroup, api.env.basedn),
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}
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_valid_permissions_values = [
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u'read', u'write', u'add', u'delete', u'all'
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]
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class ListOfACI(output.Output):
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type = (list, tuple)
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doc = _('A list of ACI values')
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def validate(self, cmd, entries):
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assert isinstance(entries, self.type)
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for (i, entry) in enumerate(entries):
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if not isinstance(entry, unicode):
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raise TypeError(output.emsg %
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(cmd.name, self.__class__.__name__,
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self.name, i, unicode, type(entry), entry)
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)
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aci_output = (
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output.Output('result', unicode, 'A string representing the ACI'),
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output.value,
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output.summary,
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)
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def _make_aci(current, aciname, kw):
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"""
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Given a name and a set of keywords construct an ACI.
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"""
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# Do some quick and dirty validation.
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t1 = 'type' in kw
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t2 = 'filter' in kw
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t3 = 'subtree' in kw
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t4 = 'targetgroup' in kw
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t5 = 'attrs' in kw
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t6 = 'memberof' in kw
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if t1 + t2 + t3 + t4 > 1:
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raise errors.ValidationError(name='target', error=_('type, filter, subtree and targetgroup are mutually exclusive'))
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if t1 + t2 + t3 + t4 + t5 + t6 == 0:
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raise errors.ValidationError(name='target', error=_('at least one of: type, filter, subtree, targetgroup, attrs or memberof are required'))
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group = 'group' in kw
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permission = 'permission' in kw
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selfaci = 'selfaci' in kw and kw['selfaci'] == True
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if group + permission + selfaci > 1:
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raise errors.ValidationError(name='target', error=_('group, permission and self are mutually exclusive'))
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elif group + permission + selfaci == 0:
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raise errors.ValidationError(name='target', error=_('One of group, permission or self is required'))
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# Grab the dn of the group we're granting access to. This group may be a
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# permission or a user group.
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entry_attrs = []
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if permission:
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# This will raise NotFound if the permission doesn't exist
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try:
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entry_attrs = api.Command['permission_show'](kw['permission'])['result']
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except errors.NotFound, e:
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if 'test' in kw and not kw.get('test'):
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raise e
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else:
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entry_attrs = {'dn': 'cn=%s,%s' % (kw['permission'], api.env.container_permission)}
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elif group:
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# Not so friendly with groups. This will raise
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try:
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entry_attrs = api.Command['group_show'](kw['group'])['result']
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except errors.NotFound:
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raise errors.NotFound(reason=_("Group '%s' does not exist") % kw['group'])
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a = ACI(current)
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a.name = aciname
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a.permissions = kw['permissions']
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if 'selfaci' in kw and kw['selfaci']:
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a.set_bindrule('userdn = "ldap:///self"')
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else:
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dn = entry_attrs['dn']
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a.set_bindrule('groupdn = "ldap:///%s"' % dn)
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if 'attrs' in kw:
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a.set_target_attr(kw['attrs'])
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if 'memberof' in kw:
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entry_attrs = api.Command['group_show'](kw['memberof'])['result']
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a.set_target_filter('memberOf=%s' % entry_attrs['dn'])
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if 'filter' in kw:
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a.set_target_filter(kw['filter'])
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if 'type' in kw:
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target = _type_map[kw['type']]
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a.set_target(target)
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if 'targetgroup' in kw:
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# Purposely no try here so we'll raise a NotFound
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entry_attrs = api.Command['group_show'](kw['targetgroup'])['result']
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target = 'ldap:///%s' % entry_attrs['dn']
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a.set_target(target)
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if 'subtree' in kw:
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# See if the subtree is a full URI
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target = kw['subtree']
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if not target.startswith('ldap:///'):
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target = 'ldap:///%s' % target
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a.set_target(target)
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return a
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def _aci_to_kw(ldap, a, test=False):
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"""Convert an ACI into its equivalent keywords.
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This is used for the modify operation so we can merge the
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incoming kw and existing ACI and pass the result to
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_make_aci().
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"""
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kw = {}
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kw['aciname'] = a.name
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kw['permissions'] = tuple(a.permissions)
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if 'targetattr' in a.target:
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kw['attrs'] = list(a.target['targetattr']['expression'])
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for i in xrange(len(kw['attrs'])):
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kw['attrs'][i] = unicode(kw['attrs'][i])
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kw['attrs'] = tuple(kw['attrs'])
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if 'targetfilter' in a.target:
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target = a.target['targetfilter']['expression']
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if target.startswith('memberOf'):
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kw['memberof'] = unicode(target)
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else:
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kw['filter'] = unicode(target)
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if 'target' in a.target:
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target = a.target['target']['expression']
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found = False
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for k in _type_map.keys():
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if _type_map[k] == target:
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kw['type'] = unicode(k)
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found = True
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break;
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if not found:
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if target.startswith('('):
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kw['filter'] = unicode(target)
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else:
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# See if the target is a group. If so we set the
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# targetgroup attr, otherwise we consider it a subtree
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if api.env.container_group in target:
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kw['targetgroup'] = unicode(target)
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else:
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kw['subtree'] = unicode(target)
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groupdn = a.bindrule['expression']
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groupdn = groupdn.replace('ldap:///','')
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if groupdn == 'self':
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kw['selfaci'] = True
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elif groupdn == 'anyone':
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pass
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else:
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if groupdn.startswith('cn='):
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dn = ''
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entry_attrs = {}
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try:
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(dn, entry_attrs) = ldap.get_entry(groupdn, ['cn'])
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except errors.NotFound, e:
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# FIXME, use real name here
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if test:
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dn = 'cn=%s,%s' % ('test', api.env.container_permission)
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entry_attrs = {'cn': [u'test']}
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if api.env.container_permission in dn:
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kw['permission'] = entry_attrs['cn'][0]
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else:
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if 'cn' in entry_attrs:
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kw['group'] = entry_attrs['cn'][0]
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return kw
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def _convert_strings_to_acis(acistrs):
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acis = []
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for a in acistrs:
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try:
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acis.append(ACI(a))
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except SyntaxError, e:
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logging.warn("Failed to parse: %s" % a)
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return acis
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def _find_aci_by_name(acis, aciname):
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for a in acis:
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if a.name.lower() == aciname.lower():
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return a
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raise errors.NotFound(reason=_('ACI with name "%s" not found') % aciname)
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def validate_permissions(ugettext, permissions):
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valid_permissions = []
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permissions = permissions.split(',')
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for p in permissions:
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p = p.strip().lower()
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if not p in _valid_permissions_values:
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return '"%s" is not a valid permission' % p
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def _normalize_permissions(permissions):
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valid_permissions = []
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permissions = permissions.split(',')
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for p in permissions:
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p = p.strip().lower()
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if p not in valid_permissions:
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valid_permissions.append(p)
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return ','.join(valid_permissions)
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class aci(Object):
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"""
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ACI object.
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"""
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INTERNAL = True
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label = _('ACIs')
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takes_params = (
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Str('aciname',
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cli_name='name',
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label=_('ACI name'),
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primary_key=True,
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),
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Str('permission?',
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cli_name='permission',
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label=_('Permission'),
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doc=_('Permission ACI grants access to'),
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),
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Str('group?',
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cli_name='group',
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label=_('User group'),
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doc=_('User group ACI grants access to'),
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),
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List('permissions', validate_permissions,
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cli_name='permissions',
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label=_('Permissions'),
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doc=_('comma-separated list of permissions to grant' \
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'(read, write, add, delete, all)'),
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normalizer=_normalize_permissions,
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),
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List('attrs?',
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cli_name='attrs',
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label=_('Attributes'),
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doc=_('Comma-separated list of attributes'),
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),
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StrEnum('type?',
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cli_name='type',
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label=_('Type'),
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doc=_('type of IPA object (user, group, host, hostgroup, service, netgroup)'),
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values=(u'user', u'group', u'host', u'service', u'hostgroup', u'netgroup'),
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),
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Str('memberof?',
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cli_name='memberof',
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label=_('Member of'), # FIXME: Does this label make sense?
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doc=_('Member of a group'),
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),
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Str('filter?',
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cli_name='filter',
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label=_('Filter'),
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doc=_('Legal LDAP filter (e.g. ou=Engineering)'),
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),
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Str('subtree?',
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cli_name='subtree',
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label=_('Subtree'),
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doc=_('Subtree to apply ACI to'),
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),
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Str('targetgroup?',
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cli_name='targetgroup',
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label=_('Target group'),
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doc=_('Group to apply ACI to'),
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),
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Flag('selfaci?',
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cli_name='self',
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label=_('Target your own entry (self)'),
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doc=_('Apply ACI to your own entry (self)'),
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),
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)
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api.register(aci)
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class aci_add(crud.Create):
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"""
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Create new ACI.
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"""
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INTERNAL = True
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msg_summary = _('Created ACI "%(value)s"')
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takes_options = (
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Flag('test?',
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doc=_('Test the ACI syntax but don\'t write anything'),
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default=False,
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),
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)
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def execute(self, aciname, **kw):
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"""
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Execute the aci-create operation.
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Returns the entry as it will be created in LDAP.
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:param aciname: The name of the ACI being added.
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:param kw: Keyword arguments for the other LDAP attributes.
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"""
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assert 'aciname' not in kw
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ldap = self.api.Backend.ldap2
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newaci = _make_aci(None, aciname, kw)
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(dn, entry_attrs) = ldap.get_entry(self.api.env.basedn, ['aci'])
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acis = _convert_strings_to_acis(entry_attrs.get('aci', []))
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for a in acis:
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# FIXME: add check for permission_group = permission_group
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if a.isequal(newaci) or newaci.name == a.name:
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raise errors.DuplicateEntry()
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newaci_str = unicode(newaci)
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entry_attrs['aci'].append(newaci_str)
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if not kw.get('test', False):
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ldap.update_entry(dn, entry_attrs)
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if kw.get('raw', False):
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result = dict(aci=unicode(newaci_str))
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else:
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result = _aci_to_kw(ldap, newaci, kw.get('test', False))
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return dict(
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result=result,
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value=aciname,
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)
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api.register(aci_add)
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|
|
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class aci_del(crud.Delete):
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"""
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Delete ACI.
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"""
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INTERNAL = True
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has_output = output.standard_delete
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msg_summary = _('Deleted ACI "%(value)s"')
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|
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def execute(self, aciname, **kw):
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"""
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Execute the aci-delete operation.
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:param aciname: The name of the ACI being added.
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:param kw: unused
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"""
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assert 'aciname' not in kw
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ldap = self.api.Backend.ldap2
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|
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(dn, entry_attrs) = ldap.get_entry(self.api.env.basedn, ['aci'])
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acistrs = entry_attrs.get('aci', [])
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acis = _convert_strings_to_acis(acistrs)
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aci = _find_aci_by_name(acis, aciname)
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for a in acistrs:
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candidate = ACI(a)
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if aci.isequal(candidate):
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acistrs.remove(a)
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break
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entry_attrs['aci'] = acistrs
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ldap.update_entry(dn, entry_attrs)
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return dict(
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result=True,
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value=aciname,
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)
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api.register(aci_del)
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|
|
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class aci_mod(crud.Update):
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"""
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Modify ACI.
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"""
|
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INTERNAL = True
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has_output_params = (
|
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Str('aci',
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label=_('ACI'),
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),
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)
|
|
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msg_summary = _('Modified ACI "%(value)s"')
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|
|
def execute(self, aciname, **kw):
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ldap = self.api.Backend.ldap2
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(dn, entry_attrs) = ldap.get_entry(self.api.env.basedn, ['aci'])
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acis = _convert_strings_to_acis(entry_attrs.get('aci', []))
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aci = _find_aci_by_name(acis, aciname)
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|
|
# The strategy here is to convert the ACI we're updating back into
|
|
# a series of keywords. Then we replace any keywords that have been
|
|
# updated and convert that back into an ACI and write it out.
|
|
newkw = _aci_to_kw(ldap, aci)
|
|
if 'selfaci' in newkw and newkw['selfaci'] == True:
|
|
# selfaci is set in aci_to_kw to True only if the target is self
|
|
kw['selfaci'] = True
|
|
for k in kw.keys():
|
|
newkw[k] = kw[k]
|
|
if 'aciname' in newkw:
|
|
del newkw['aciname']
|
|
|
|
# _make_aci is what is run in aci_add and validates the input.
|
|
# Do this before we delete the existing ACI.
|
|
newaci = _make_aci(None, aciname, newkw)
|
|
if aci.isequal(newaci):
|
|
raise errors.EmptyModlist()
|
|
|
|
self.api.Command['aci_del'](aciname)
|
|
|
|
result = self.api.Command['aci_add'](aciname, **newkw)['result']
|
|
|
|
if kw.get('raw', False):
|
|
result = dict(aci=unicode(newaci))
|
|
else:
|
|
result = _aci_to_kw(ldap, newaci)
|
|
return dict(
|
|
result=result,
|
|
value=aciname,
|
|
)
|
|
|
|
api.register(aci_mod)
|
|
|
|
|
|
class aci_find(crud.Search):
|
|
"""
|
|
Search for ACIs.
|
|
|
|
Returns a list of ACIs
|
|
|
|
EXAMPLES:
|
|
|
|
To find all ACIs that apply directly to members of the group ipausers:
|
|
ipa aci-find --memberof=ipausers
|
|
|
|
To find all ACIs that grant add access:
|
|
ipa aci-find --permissions=add
|
|
|
|
Note that the find command only looks for the given text in the set of
|
|
ACIs, it does not evaluate the ACIs to see if something would apply.
|
|
For example, searching on memberof=ipausers will find all ACIs that
|
|
have ipausers as a memberof. There may be other ACIs that apply to
|
|
members of that group indirectly.
|
|
"""
|
|
INTERNAL = True
|
|
msg_summary = ngettext('%(count)d ACI matched', '%(count)d ACIs matched', 0)
|
|
|
|
def execute(self, term, **kw):
|
|
ldap = self.api.Backend.ldap2
|
|
|
|
(dn, entry_attrs) = ldap.get_entry(self.api.env.basedn, ['aci'])
|
|
|
|
acis = _convert_strings_to_acis(entry_attrs.get('aci', []))
|
|
results = []
|
|
|
|
if term:
|
|
term = term.lower()
|
|
for a in acis:
|
|
if a.name.lower().find(term) != -1 and a not in results:
|
|
results.append(a)
|
|
acis = list(results)
|
|
else:
|
|
results = list(acis)
|
|
|
|
if 'aciname' in kw:
|
|
for a in acis:
|
|
if a.name != kw['aciname']:
|
|
results.remove(a)
|
|
acis = list(results)
|
|
|
|
if 'attrs' in kw:
|
|
for a in acis:
|
|
if not 'targetattr' in a.target:
|
|
results.remove(a)
|
|
continue
|
|
alist1 = sorted(
|
|
[t.lower() for t in a.target['targetattr']['expression']]
|
|
)
|
|
alist2 = sorted([t.lower() for t in kw['attrs']])
|
|
if len(set(alist1) & set(alist2)) != len(alist2):
|
|
results.remove(a)
|
|
acis = list(results)
|
|
|
|
if 'permission' in kw:
|
|
try:
|
|
self.api.Command['permission_show'](
|
|
kw['permission']
|
|
)
|
|
except errors.NotFound:
|
|
pass
|
|
else:
|
|
for a in acis:
|
|
if a.bindrule['expression'] != ('ldap:///%s' % dn):
|
|
results.remove(a)
|
|
acis = list(results)
|
|
|
|
if 'permissions' in kw:
|
|
for a in acis:
|
|
alist1 = sorted(a.permissions)
|
|
alist2 = sorted(kw['permissions'])
|
|
if len(set(alist1) & set(alist2)) != len(alist2):
|
|
results.remove(a)
|
|
acis = list(results)
|
|
|
|
if 'memberof' in kw:
|
|
try:
|
|
self.api.Command['group_show'](
|
|
kw['memberof']
|
|
)
|
|
except errors.NotFound:
|
|
pass
|
|
else:
|
|
memberof_filter = '(memberOf=%s)' % dn
|
|
for a in acis:
|
|
if 'targetfilter' in a.target:
|
|
targetfilter = a.target['targetfilter']['expression']
|
|
if targetfilter != memberof_filter:
|
|
results.remove(a)
|
|
else:
|
|
results.remove(a)
|
|
# uncomment next line if you add more search criteria
|
|
# acis = list(results)
|
|
|
|
for a in acis:
|
|
if 'target' in a.target:
|
|
target = a.target['target']['expression']
|
|
else:
|
|
results.remove(a)
|
|
continue
|
|
found = False
|
|
for k in _type_map.keys():
|
|
if _type_map[k] == target and 'type' in kw and kw['type'] == k:
|
|
found = True
|
|
break;
|
|
if not found:
|
|
try:
|
|
results.remove(a)
|
|
except ValueError:
|
|
pass
|
|
|
|
# TODO: searching by: filter, subtree
|
|
|
|
acis = []
|
|
for result in results:
|
|
if kw.get('raw', False):
|
|
aci = dict(aci=unicode(result))
|
|
else:
|
|
aci = _aci_to_kw(ldap, result)
|
|
acis.append(aci)
|
|
|
|
return dict(
|
|
result=acis,
|
|
count=len(acis),
|
|
truncated=False,
|
|
)
|
|
|
|
api.register(aci_find)
|
|
|
|
|
|
class aci_show(crud.Retrieve):
|
|
"""
|
|
Display a single ACI given an ACI name.
|
|
"""
|
|
INTERNAL = True
|
|
|
|
has_output_params = (
|
|
Str('aci',
|
|
label=_('ACI'),
|
|
),
|
|
)
|
|
|
|
def execute(self, aciname, **kw):
|
|
"""
|
|
Execute the aci-show operation.
|
|
|
|
Returns the entry
|
|
|
|
:param uid: The login name of the user to retrieve.
|
|
:param kw: unused
|
|
"""
|
|
ldap = self.api.Backend.ldap2
|
|
|
|
(dn, entry_attrs) = ldap.get_entry(self.api.env.basedn, ['aci'])
|
|
|
|
acis = _convert_strings_to_acis(entry_attrs.get('aci', []))
|
|
|
|
aci = _find_aci_by_name(acis, aciname)
|
|
if kw.get('raw', False):
|
|
result = dict(aci=unicode(aci))
|
|
else:
|
|
result = _aci_to_kw(ldap, aci)
|
|
return dict(
|
|
result=result,
|
|
value=aciname,
|
|
)
|
|
|
|
api.register(aci_show)
|
|
|
|
|
|
class aci_rename(crud.Update):
|
|
"""
|
|
Rename an ACI.
|
|
"""
|
|
INTERNAL = True
|
|
has_output_params = (
|
|
Str('aci',
|
|
label=_('ACI'),
|
|
),
|
|
)
|
|
|
|
takes_options = (
|
|
Str('newname',
|
|
doc=_('New ACI name'),
|
|
),
|
|
)
|
|
|
|
msg_summary = _('Renameed ACI to "%(value)s"')
|
|
|
|
def execute(self, aciname, **kw):
|
|
ldap = self.api.Backend.ldap2
|
|
|
|
(dn, entry_attrs) = ldap.get_entry(self.api.env.basedn, ['aci'])
|
|
|
|
acis = _convert_strings_to_acis(entry_attrs.get('aci', []))
|
|
aci = _find_aci_by_name(acis, aciname)
|
|
|
|
for a in acis:
|
|
if kw['newname'] == a.name:
|
|
raise errors.DuplicateEntry()
|
|
|
|
# The strategy here is to convert the ACI we're updating back into
|
|
# a series of keywords. Then we replace any keywords that have been
|
|
# updated and convert that back into an ACI and write it out.
|
|
newkw = _aci_to_kw(ldap, aci)
|
|
if 'selfaci' in newkw and newkw['selfaci'] == True:
|
|
# selfaci is set in aci_to_kw to True only if the target is self
|
|
kw['selfaci'] = True
|
|
if 'aciname' in newkw:
|
|
del newkw['aciname']
|
|
|
|
# _make_aci is what is run in aci_add and validates the input.
|
|
# Do this before we delete the existing ACI.
|
|
newaci = _make_aci(None, kw['newname'], newkw)
|
|
|
|
self.api.Command['aci_del'](aciname)
|
|
|
|
result = self.api.Command['aci_add'](kw['newname'], **newkw)['result']
|
|
|
|
if kw.get('raw', False):
|
|
result = dict(aci=unicode(newaci))
|
|
else:
|
|
result = _aci_to_kw(ldap, newaci)
|
|
return dict(
|
|
result=result,
|
|
value=kw['newname'],
|
|
)
|
|
|
|
api.register(aci_rename)
|