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16ee6847e4
The "Read DNS Entries" permission, which was marked SYSTEM (no associated ACI), can now be converted to a regular managed permission. Add a mechanism for the updater to replace old SYSTEM permissions. This cannot be done in an update file because we do not want to replace V2 permissions with the same name. Part of the work for: https://fedorahosted.org/freeipa/ticket/4346 Reviewed-By: Martin Kosek <mkosek@redhat.com>
591 lines
25 KiB
Python
591 lines
25 KiB
Python
# Authors:
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# Petr Viktorin <pviktori@redhat.com>
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#
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# Copyright (C) 2014 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 modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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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, see <http://www.gnu.org/licenses/>.
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"""
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Plugin for updating managed permissions.
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The permissions are declared in Object plugins in the "managed_permissions"
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attribute, which is a dictionary mapping permission names to a "template"
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for the updater.
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For example, an entry could look like this:
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managed_permissions = {
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'System: Read Object A': {
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'ipapermbindruletype': 'all',
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'ipapermright': {'read', 'search', 'compare'},
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'ipapermdefaultattr': {'cn', 'description'},
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'replaces_global_anonymous_aci': True,
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},
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}
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For permissions not tied to an object plugin, a NONOBJECT_PERMISSIONS
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dict of the same format is defined in this module.
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The permission name must start with the "System:" prefix.
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The template dictionary can have the following keys:
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* ipapermtarget, ipapermtargetfilter, ipapermlocation, ipapermright, objectclass
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- Directly used as attributes on the permission.
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- Replaced when upgrading an existing permission
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- If not specified, these default to the defaults of a permission of the
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corresponding --type, or, if non_object is specified, or if not on an
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object, to general permission defaults .
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- ipapermlocation and ipapermtarget must be DNs
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- ipapermtargetfilter and objectclass must be iterables of strings
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* ipapermbindruletype
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- Directly used as attribute on the permission.
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- Not replaced when upgrading an existing permission.
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* ipapermdefaultattr
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- Used as attribute of the permission.
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- When upgrading, only new values are added; all old values are kept.
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* default_privileges
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- Names of privileges to add the permission to
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- Only applied on newly created permissions
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* replaces_global_anonymous_aci
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- If true, any attributes specified (denied) in the legacy global anonymous
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read ACI will be added to excluded_attributes of the new permission.
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- Has no effect when existing permissions are updated.
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* non_object
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- If true, no object-specific defaults are used (e.g. for
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ipapermtargetfilter, ipapermlocation).
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* replaces
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- A list of ACIs corresponding to legacy default permissions replaced
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by this permission.
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* replaces_system
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- A list of names of old SYSTEM permissions this replaces.
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* fixup_function
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- A callable that may modify the template in-place before it is applied.
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- Called with the permission name, template dict, and keyword arguments:
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- is_new: true if the permission was previously existing
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- anonymous_read_aci: the legacy 'Enable Anonymous access' ACI as
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an ipalib.aci.ACI object, or None if it does not exist
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Extra keyword arguments must be ignored, since this list may grow
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in the future.
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No other keys are allowed in the template
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"""
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from ipalib import api, errors
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from ipapython.dn import DN
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from ipalib.plugable import Registry
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from ipalib.plugins import aci
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from ipalib.plugins.permission import permission, permission_del
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from ipalib.aci import ACI
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from ipapython import ipautil
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from ipaserver.plugins.ldap2 import ldap2
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from ipaserver.install.plugins import LAST
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from ipaserver.install.plugins.baseupdate import PostUpdate
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register = Registry()
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NONOBJECT_PERMISSIONS = {
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'System: Read IPA Masters': {
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'replaces_global_anonymous_aci': True,
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'ipapermlocation': DN('cn=masters,cn=ipa,cn=etc', api.env.basedn),
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'ipapermtargetfilter': {'(objectclass=nscontainer)'},
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'ipapermbindruletype': 'permission',
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'ipapermright': {'read', 'search', 'compare'},
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'ipapermdefaultattr': {
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'cn', 'objectclass', 'ipaconfigstring',
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},
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'default_privileges': {'IPA Masters Readers'},
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},
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'System: Read DNA Configuration': {
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'replaces_global_anonymous_aci': True,
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'ipapermlocation': DN('cn=dna,cn=ipa,cn=etc', api.env.basedn),
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'ipapermtargetfilter': {'(objectclass=dnasharedconfig)'},
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'ipapermbindruletype': 'all',
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'ipapermright': {'read', 'search', 'compare'},
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'ipapermdefaultattr': {
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'cn', 'objectclass', 'dnaHostname', 'dnaPortNum',
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'dnaSecurePortNum', 'dnaRemoteBindMethod', 'dnaRemoteConnProtocol',
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'dnaRemainingValues',
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},
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},
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'System: Read CA Renewal Information': {
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'replaces_global_anonymous_aci': True,
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'ipapermlocation': DN('cn=ca_renewal,cn=ipa,cn=etc', api.env.basedn),
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'ipapermtargetfilter': {'(objectclass=pkiuser)'},
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'ipapermbindruletype': 'all',
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'ipapermright': {'read', 'search', 'compare'},
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'ipapermdefaultattr': {
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'cn', 'objectclass', 'usercertificate',
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},
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},
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'System: Read CA Certificate': {
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'replaces_global_anonymous_aci': True,
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'ipapermlocation': DN('cn=CAcert,cn=ipa,cn=etc', api.env.basedn),
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'ipapermtargetfilter': {'(objectclass=pkica)'},
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'ipapermbindruletype': 'anonymous',
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'ipapermright': {'read', 'search', 'compare'},
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'ipapermdefaultattr': {
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'cn', 'objectclass', 'cacertificate', 'certificaterevocationlist',
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'authorityrevocationlist', 'crosscertificatepair',
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},
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},
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'System: Read Replication Information': {
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'replaces_global_anonymous_aci': True,
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'ipapermlocation': DN('cn=replication,cn=etc', api.env.basedn),
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'ipapermtargetfilter': {'(objectclass=nsds5replica)'},
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'ipapermbindruletype': 'all',
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'ipapermright': {'read', 'search', 'compare'},
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'ipapermdefaultattr': {
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'cn', 'objectclass', 'nsds5replicaroot', 'nsds5replicaid',
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'nsds5replicacleanruv', 'nsds5replicaabortcleanruv',
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'nsds5replicatype', 'nsds5replicabinddn', 'nsstate',
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'nsds5replicaname', 'nsds5flags', 'nsds5task',
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'nsds5replicareferral', 'nsds5replicaautoreferral',
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'nsds5replicapurgedelay', 'nsds5replicatombstonepurgeinterval',
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'nsds5replicachangecount', 'nsds5replicalegacyconsumer',
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'nsds5replicaprotocoltimeout', 'nsds5replicabackoffmin',
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'nsds5replicabackoffmax',
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},
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},
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'System: Read AD Domains': {
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'replaces_global_anonymous_aci': True,
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'ipapermlocation': DN('cn=etc', api.env.basedn),
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'ipapermtarget': DN('cn=ad,cn=etc', api.env.basedn),
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'ipapermtargetfilter': {'(objectclass=ipantdomainattrs)'},
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'ipapermbindruletype': 'all',
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'ipapermright': {'read', 'search', 'compare'},
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'ipapermdefaultattr': {
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'cn', 'objectclass', 'ipantsecurityidentifier', 'ipantflatname',
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'ipantdomainguid', 'ipantfallbackprimarygroup',
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},
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},
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'System: Read Replication Agreements': {
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'ipapermlocation': DN('cn=config'),
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'ipapermtargetfilter': {
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'(|'
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'(objectclass=nsds5Replica)'
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'(objectclass=nsds5replicationagreement)'
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'(objectclass=nsDSWindowsReplicationAgreement)'
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'(objectClass=nsMappingTree)'
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')'
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},
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'ipapermbindruletype': 'permission',
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'ipapermright': {'read', 'search', 'compare'},
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'ipapermdefaultattr': {
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'cn', 'objectclass',
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# nsds5Replica
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'nsds5replicaroot', 'nsds5replicaid', 'nsds5replicacleanruv',
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'nsds5replicaabortcleanruv', 'nsds5replicatype',
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'nsds5replicabinddn', 'nsstate', 'nsds5replicaname',
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'nsds5flags', 'nsds5task', 'nsds5replicareferral',
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'nsds5replicaautoreferral', 'nsds5replicapurgedelay',
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'nsds5replicatombstonepurgeinterval', 'nsds5replicachangecount',
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'nsds5replicalegacyconsumer', 'nsds5replicaprotocoltimeout',
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'nsds5replicabackoffmin', 'nsds5replicabackoffmax',
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# nsds5replicationagreement
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'nsds5replicacleanruvnotified', 'nsds5replicahost',
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'nsds5replicaport', 'nsds5replicatransportinfo',
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'nsds5replicabinddn', 'nsds5replicacredentials',
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'nsds5replicabindmethod', 'nsds5replicaroot',
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'nsds5replicatedattributelist',
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'nsds5replicatedattributelisttotal', 'nsds5replicaupdateschedule',
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'nsds5beginreplicarefresh', 'description', 'nsds50ruv',
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'nsruvreplicalastmodified', 'nsds5replicatimeout',
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'nsds5replicachangessentsincestartup', 'nsds5replicalastupdateend',
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'nsds5replicalastupdatestart', 'nsds5replicalastupdatestatus',
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'nsds5replicaupdateinprogress', 'nsds5replicalastinitend',
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'nsds5replicaenabled', 'nsds5replicalastinitstart',
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'nsds5replicalastinitstatus', 'nsds5debugreplicatimeout',
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'nsds5replicabusywaittime', 'nsds5replicastripattrs',
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'nsds5replicasessionpausetime', 'nsds5replicaprotocoltimeout',
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# nsDSWindowsReplicationAgreement
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'nsds5replicahost', 'nsds5replicaport',
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'nsds5replicatransportinfo', 'nsds5replicabinddn',
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'nsds5replicacredentials', 'nsds5replicabindmethod',
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'nsds5replicaroot', 'nsds5replicatedattributelist',
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'nsds5replicaupdateschedule', 'nsds5beginreplicarefresh',
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'description', 'nsds50ruv', 'nsruvreplicalastmodified',
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'nsds5replicatimeout', 'nsds5replicachangessentsincestartup',
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'nsds5replicalastupdateend', 'nsds5replicalastupdatestart',
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'nsds5replicalastupdatestatus', 'nsds5replicaupdateinprogress',
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'nsds5replicalastinitend', 'nsds5replicalastinitstart',
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'nsds5replicalastinitstatus', 'nsds5debugreplicatimeout',
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'nsds5replicabusywaittime', 'nsds5replicasessionpausetime',
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'nsds7windowsreplicasubtree', 'nsds7directoryreplicasubtree',
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'nsds7newwinusersyncenabled', 'nsds7newwingroupsyncenabled',
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'nsds7windowsdomain', 'nsds7dirsynccookie', 'winsyncinterval',
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'onewaysync', 'winsyncmoveaction', 'nsds5replicaenabled',
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'winsyncdirectoryfilter', 'winsyncwindowsfilter',
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'winsyncsubtreepair',
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},
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'default_privileges': {'Replication Administrators'},
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}
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}
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class IncompatibleACIModification(Exception):
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"""User has made a legacy default perm modification we can't handle"""
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@register()
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class update_managed_permissions(PostUpdate):
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"""Update managed permissions after an update.
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Update managed permissions according to templates specified in plugins.
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For read permissions, puts any attributes specified in the legacy
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Anonymous access ACI in the exclude list when creating the permission.
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"""
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order = LAST
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def get_anonymous_read_aci(self, ldap):
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aciname = u'Enable Anonymous access'
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aciprefix = u'none'
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base_entry = ldap.get_entry(self.api.env.basedn, ['aci'])
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acistrs = base_entry.get('aci', [])
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acilist = aci._convert_strings_to_acis(acistrs)
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try:
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return aci._find_aci_by_name(acilist, aciprefix, aciname)
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except errors.NotFound:
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return None
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def remove_anonymous_read_aci(self, ldap, anonymous_read_aci):
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base_entry = ldap.get_entry(self.api.env.basedn, ['aci'])
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acistrs = base_entry.get('aci', [])
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for acistr in acistrs:
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if ACI(acistr).isequal(anonymous_read_aci):
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self.log.info('Removing anonymous ACI: %s', acistr)
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acistrs.remove(acistr)
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break
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else:
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return
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ldap.update_entry(base_entry)
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def get_templates(self):
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"""Return (name, template, obj) triples for all managed permissions
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If the permission is not defined in an object plugin, obj is None.
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Entries with the same obj are returned consecutively.
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"""
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for obj in sorted(self.api.Object(), key=lambda o: o.name):
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managed_permissions = getattr(obj, 'managed_permissions', {})
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for name, template in sorted(managed_permissions.iteritems()):
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yield name, template, obj
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for name, template in sorted(NONOBJECT_PERMISSIONS.iteritems()):
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yield name, template, None
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def execute(self, **options):
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ldap = self.api.Backend[ldap2]
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anonymous_read_aci = self.get_anonymous_read_aci(ldap)
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if anonymous_read_aci:
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self.log.info('Anonymous read ACI: %s', anonymous_read_aci)
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else:
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self.log.info('Anonymous ACI not found')
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current_obj = () # initially distinct from any obj value, even None
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for name, template, obj in self.get_templates():
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if current_obj != obj:
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if obj:
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self.log.info('Updating managed permissions for %s',
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obj.name)
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else:
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self.log.info('Updating non-object managed permissions')
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current_obj = obj
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self.update_permission(ldap,
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obj,
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unicode(name),
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template,
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anonymous_read_aci)
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if anonymous_read_aci:
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self.remove_anonymous_read_aci(ldap, anonymous_read_aci)
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return False, False, ()
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def update_permission(self, ldap, obj, name, template, anonymous_read_aci):
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"""Update the given permission and the corresponding ACI"""
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assert name.startswith('System:')
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dn = self.api.Object[permission].get_dn(name)
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permission_plugin = self.api.Object[permission]
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try:
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attrs_list = list(permission_plugin.default_attributes)
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attrs_list.remove('memberindirect')
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entry = ldap.get_entry(dn, attrs_list)
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is_new = False
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except errors.NotFound:
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entry = ldap.make_entry(dn)
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is_new = True
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self.update_entry(obj, entry, template,
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anonymous_read_aci, is_new=is_new)
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remove_legacy = False
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if 'replaces' in template:
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sub_dict = {
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'SUFFIX': str(self.api.env.basedn),
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}
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legacy_acistrs = [ipautil.template_str(r, sub_dict)
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for r in template['replaces']]
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legacy_aci = ACI(legacy_acistrs[0])
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prefix, sep, legacy_name = legacy_aci.name.partition(':')
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assert prefix == 'permission' and sep
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legacy_dn = permission_plugin.get_dn(legacy_name)
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try:
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legacy_entry = ldap.get_entry(legacy_dn,
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['ipapermissiontype', 'cn'])
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except errors.NotFound:
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self.log.debug("Legacy permission %s not found", legacy_name)
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else:
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if 'ipapermissiontype' not in legacy_entry:
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if is_new:
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acientry, acistr = (
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permission_plugin._get_aci_entry_and_string(
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legacy_entry, notfound_ok=True))
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try:
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included, excluded = self.get_upgrade_attr_lists(
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acistr, legacy_acistrs)
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except IncompatibleACIModification:
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self.log.error(
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"Permission '%s' has been modified from its "
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"default; not updating it to '%s'.",
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legacy_name, name)
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return
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else:
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self.log.debug("Merging attributes from legacy "
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"permission '%s'", legacy_name)
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self.log.debug("Included attrs: %s",
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', '.join(sorted(included)))
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self.log.debug("Excluded attrs: %s",
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', '.join(sorted(excluded)))
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entry['ipapermincludedattr'] = list(included)
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entry['ipapermexcludedattr'] = list(excluded)
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remove_legacy = True
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else:
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self.log.debug("Ignoring attributes in legacy "
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"permission '%s' because '%s' exists",
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legacy_name, name)
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remove_legacy = True
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else:
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self.log.debug("Ignoring V2 permission named '%s'" %
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legacy_name)
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update_aci = True
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self.log.debug('Updating managed permission: %s', name)
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if is_new:
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ldap.add_entry(entry)
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else:
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try:
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ldap.update_entry(entry)
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except errors.EmptyModlist:
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self.log.debug('No changes to permission: %s', name)
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update_aci = False
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if update_aci:
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self.log.debug('Updating ACI for managed permission: %s', name)
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permission_plugin.update_aci(entry)
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if remove_legacy:
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self.log.info("Removing legacy permission '%s'", legacy_name)
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self.api.Command[permission_del](unicode(legacy_name))
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for name in template.get('replaces_system', ()):
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name = unicode(name)
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try:
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entry = ldap.get_entry(permission_plugin.get_dn(name),
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['ipapermissiontype'])
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except errors.NotFound:
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self.log.info("Legacy permission '%s' not found", name)
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else:
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flags = entry.get('ipapermissiontype', [])
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if list(flags) == ['SYSTEM']:
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self.log.info("Removing legacy permission '%s'", name)
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self.api.Command[permission_del](name, force=True)
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else:
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self.log.info("Ignoring V2 permission '%s'", name)
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def get_upgrade_attr_lists(self, current_acistring, default_acistrings):
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"""Compute included and excluded attributes for a new permission
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:param current_acistring: ACI is in LDAP currently
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:param default_acistrings:
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List of all default ACIs IPA historically used for this permission
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:return:
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(ipapermincludedattr, ipapermexcludedattr) for the upgraded
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permission
|
|
|
|
An attribute will be included if the user has it in LDAP but it does
|
|
not appear in *any* historic ACI.
|
|
It will be excluded if it is in *all* historic ACIs but not in LDAP.
|
|
Rationale: When we don't know which version of an ACI the user is
|
|
upgrading from, we only consider attributes where all the versions
|
|
agree. For other attrs we'll use the default from the new managed perm.
|
|
|
|
If the ACIs differ in something else than the list of attributes,
|
|
raise IncompatibleACIModification. This means manual action is needed
|
|
(either delete the old permission or change it to resemble the default
|
|
again, then re-run ipa-ldap-updater).
|
|
|
|
In case there are multiple historic default ACIs, and some of them
|
|
are compatible with the current but other ones aren't, we deduce that
|
|
the user is upgrading from one of the compatible ones.
|
|
The incompatible ones are removed from consideration, both for
|
|
compatibility and attribute lists.
|
|
"""
|
|
assert default_acistrings
|
|
|
|
def _pop_targetattr(aci):
|
|
"""Return the attr list it as a set, clear it in the ACI object
|
|
"""
|
|
targetattr = aci.target.get('targetattr')
|
|
if targetattr:
|
|
attrs = targetattr['expression']
|
|
targetattr['expression'] = []
|
|
return set(t.lower() for t in attrs)
|
|
else:
|
|
return set()
|
|
|
|
current_aci = ACI(current_acistring)
|
|
current_attrs = _pop_targetattr(current_aci)
|
|
self.log.debug("Current ACI for '%s': %s",
|
|
current_aci.name, current_acistring)
|
|
|
|
attrs_in_all_defaults = None
|
|
attrs_in_any_defaults = set()
|
|
all_incompatible = True
|
|
for default_acistring in default_acistrings:
|
|
default_aci = ACI(default_acistring)
|
|
default_attrs = _pop_targetattr(default_aci)
|
|
self.log.debug("Default ACI for '%s': %s",
|
|
default_aci.name, default_acistring)
|
|
|
|
if current_aci != default_aci:
|
|
self.log.debug('ACIs not compatible')
|
|
continue
|
|
else:
|
|
all_incompatible = False
|
|
|
|
if attrs_in_all_defaults is None:
|
|
attrs_in_all_defaults = set(default_attrs)
|
|
else:
|
|
attrs_in_all_defaults &= attrs_in_all_defaults
|
|
attrs_in_any_defaults |= default_attrs
|
|
|
|
if all_incompatible:
|
|
self.log.debug('All old default ACIs are incompatible')
|
|
raise(IncompatibleACIModification())
|
|
|
|
included = current_attrs - attrs_in_any_defaults
|
|
excluded = attrs_in_all_defaults - current_attrs
|
|
|
|
return included, excluded
|
|
|
|
def update_entry(self, obj, entry, template,
|
|
anonymous_read_aci, is_new):
|
|
"""Update the given permission Entry (without contacting LDAP)"""
|
|
|
|
[name_ava] = entry.dn[0]
|
|
assert name_ava.attr == 'cn'
|
|
name = name_ava.value
|
|
entry.single_value['cn'] = name
|
|
|
|
template = dict(template)
|
|
template.pop('replaces', None)
|
|
template.pop('replaces_system', None)
|
|
|
|
fixup_function = template.pop('fixup_function', None)
|
|
if fixup_function:
|
|
fixup_function(name, template,
|
|
is_new=is_new,
|
|
anonymous_read_aci=anonymous_read_aci)
|
|
|
|
if template.pop('non_object', False):
|
|
obj = None
|
|
|
|
entry['ipapermissiontype'] = [u'SYSTEM', u'V2', u'MANAGED']
|
|
|
|
# Attributes with defaults
|
|
objectclass = template.pop('objectclass', None)
|
|
if objectclass is None:
|
|
objectclass = self.api.Object[permission].object_class
|
|
entry['objectclass'] = list(objectclass)
|
|
|
|
ldap_filter = template.pop('ipapermtargetfilter', None)
|
|
if obj and ldap_filter is None:
|
|
ldap_filter = ['(objectclass=%s)' % oc
|
|
for oc in obj.permission_filter_objectclasses]
|
|
entry['ipapermtargetfilter'] = list(ldap_filter or [])
|
|
|
|
ipapermlocation = template.pop('ipapermlocation', None)
|
|
if ipapermlocation is None:
|
|
assert obj
|
|
ipapermlocation = DN(obj.container_dn, self.api.env.basedn)
|
|
entry.single_value['ipapermlocation'] = ipapermlocation
|
|
|
|
# Optional attributes
|
|
ipapermtarget = template.pop('ipapermtarget', None)
|
|
if ipapermtarget is not None:
|
|
entry['ipapermtarget'] = ipapermtarget
|
|
|
|
# Attributes from template
|
|
bindruletype = template.pop('ipapermbindruletype', 'permission')
|
|
if is_new:
|
|
entry.single_value['ipapermbindruletype'] = bindruletype
|
|
|
|
entry['ipapermright'] = list(template.pop('ipapermright'))
|
|
|
|
default_privileges = template.pop('default_privileges', None)
|
|
if is_new and default_privileges:
|
|
entry['member'] = list(
|
|
DN(('cn', privilege_name),
|
|
self.api.env.container_privilege,
|
|
self.api.env.basedn)
|
|
for privilege_name in default_privileges)
|
|
|
|
# Add to the set of default attributes
|
|
attributes = set(template.pop('ipapermdefaultattr', ()))
|
|
attributes.update(entry.get('ipapermdefaultattr', ()))
|
|
attributes = set(a.lower() for a in attributes)
|
|
entry['ipapermdefaultattr'] = list(attributes)
|
|
|
|
# Exclude attributes filtered from the global read ACI
|
|
replaces_ga_aci = template.pop('replaces_global_anonymous_aci', False)
|
|
if replaces_ga_aci and is_new and anonymous_read_aci:
|
|
read_blacklist = set(
|
|
a.lower() for a in
|
|
anonymous_read_aci.target['targetattr']['expression'])
|
|
read_blacklist &= attributes
|
|
if read_blacklist:
|
|
self.log.info('Excluded attributes for %s: %s',
|
|
name, ', '.join(read_blacklist))
|
|
entry['ipapermexcludedattr'] = list(read_blacklist)
|
|
|
|
# Sanity check
|
|
if template:
|
|
raise ValueError(
|
|
'Unknown key(s) in managed permission template %s: %s' % (
|
|
name, ', '.join(template.keys())))
|