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# Authors:
# Pavel Zuna <pzuna@redhat.com>
#
# Copyright (C) 2010 Red Hat
# see file 'COPYING' for use and warranty information
#
# 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 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from ipalib import api, errors, output, _
from ipalib import Int, Str
from ipalib.plugins import baseldap
from ipalib.plugins.baseldap import entry_to_dict, pkey_to_value
from ipalib.plugable import Registry
from ipapython.dn import DN
__doc__ = _("""
Kerberos ticket policy
There is a single Kerberos ticket policy. This policy defines the
maximum ticket lifetime and the maximum renewal age, the period during
which the ticket is renewable.
You can also create a per-user ticket policy by specifying the user login.
For changes to the global policy to take effect, restarting the KDC service
is required, which can be achieved using:
service krb5kdc restart
Changes to per-user policies take effect immediately for newly requested
tickets (e.g. when the user next runs kinit).
EXAMPLES:
Display the current Kerberos ticket policy:
ipa krbtpolicy-show
Reset the policy to the default:
ipa krbtpolicy-reset
Modify the policy to 8 hours max life, 1-day max renewal:
ipa krbtpolicy-mod --maxlife=28800 --maxrenew=86400
Display effective Kerberos ticket policy for user 'admin':
ipa krbtpolicy-show admin
Reset per-user policy for user 'admin':
ipa krbtpolicy-reset admin
Modify per-user policy for user 'admin':
ipa krbtpolicy-mod admin --maxlife=3600
""")
register = Registry()
# FIXME: load this from a config file?
_default_values = {
'krbmaxticketlife': 86400,
'krbmaxrenewableage': 604800,
}
@register()
class krbtpolicy(baseldap.LDAPObject):
"""
Kerberos Ticket Policy object
"""
container_dn = DN(('cn', api.env.realm), ('cn', 'kerberos'))
object_name = _('kerberos ticket policy settings')
default_attributes = ['krbmaxticketlife', 'krbmaxrenewableage']
limit_object_classes = ['krbticketpolicyaux']
# permission_filter_objectclasses is deliberately missing,
# so it is not possible to create a permission of `--type krbtpolicy`.
# This is because we need two permissions to cover both global and per-user
# policies.
managed_permissions = {
'System: Read Default Kerberos Ticket Policy': {
'non_object': True,
'replaces_global_anonymous_aci': True,
'ipapermtargetfilter': ['(objectclass=krbticketpolicyaux)'],
'ipapermlocation': DN(container_dn, api.env.basedn),
'ipapermright': {'read', 'search', 'compare'},
'ipapermdefaultattr': {
'krbdefaultencsalttypes', 'krbmaxrenewableage',
'krbmaxticketlife', 'krbsupportedencsalttypes',
'objectclass',
},
'default_privileges': {
'Kerberos Ticket Policy Readers',
},
},
'System: Read User Kerberos Ticket Policy': {
'non_object': True,
'replaces_global_anonymous_aci': True,
'ipapermlocation': DN(api.env.container_user, api.env.basedn),
'ipapermtargetfilter': ['(objectclass=krbticketpolicyaux)'],
'ipapermright': {'read', 'search', 'compare'},
'ipapermdefaultattr': {
'krbmaxrenewableage', 'krbmaxticketlife',
},
'default_privileges': {
'Kerberos Ticket Policy Readers',
},
},
}
label = _('Kerberos Ticket Policy')
label_singular = _('Kerberos Ticket Policy')
takes_params = (
Str('uid?',
cli_name='user',
label=_('User name'),
doc=_('Manage ticket policy for specific user'),
primary_key=True,
),
Int('krbmaxticketlife?',
cli_name='maxlife',
label=_('Max life'),
doc=_('Maximum ticket life (seconds)'),
minvalue=1,
),
Int('krbmaxrenewableage?',
cli_name='maxrenew',
label=_('Max renew'),
doc=_('Maximum renewable age (seconds)'),
minvalue=1,
),
)
def get_dn(self, *keys, **kwargs):
if keys[-1] is not None:
return self.api.Object.user.get_dn(*keys, **kwargs)
return DN(self.container_dn, api.env.basedn)
@register()
class krbtpolicy_mod(baseldap.LDAPUpdate):
__doc__ = _('Modify Kerberos ticket policy.')
def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
assert isinstance(dn, DN)
# disable all flag
# ticket policies are attached to objects with unrelated attributes
if options.get('all'):
options['all'] = False
return dn
@register()
class krbtpolicy_show(baseldap.LDAPRetrieve):
__doc__ = _('Display the current Kerberos ticket policy.')
def pre_callback(self, ldap, dn, attrs_list, *keys, **options):
assert isinstance(dn, DN)
# disable all flag
# ticket policies are attached to objects with unrelated attributes
if options.get('all'):
options['all'] = False
return dn
def post_callback(self, ldap, dn, entry, *keys, **options):
default_entry = None
rights = None
for attrname in self.obj.default_attributes:
if attrname not in entry:
if keys[-1] is not None:
# User entry doesn't override the attribute.
# Check if this is caused by insufficient read rights
if rights is None:
rights = baseldap.get_effective_rights(
ldap, dn, self.obj.default_attributes)
if 'r' not in rights.get(attrname.lower(), ''):
raise errors.ACIError(
info=_('Ticket policy for %s could not be read') %
keys[-1])
# Fallback to the default
if default_entry is None:
try:
default_dn = self.obj.get_dn(None)
default_entry = ldap.get_entry(default_dn)
except errors.NotFound:
default_entry = {}
if attrname in default_entry:
entry[attrname] = default_entry[attrname]
if attrname not in entry:
raise errors.ACIError(
info=_('Default ticket policy could not be read'))
return dn
@register()
class krbtpolicy_reset(baseldap.LDAPQuery):
__doc__ = _('Reset Kerberos ticket policy to the default values.')
has_output = output.standard_entry
def execute(self, *keys, **options):
ldap = self.obj.backend
dn = self.obj.get_dn(*keys, **options)
def_values = {}
# if reseting policy for a user - just his values
if keys[-1] is not None:
for a in self.obj.default_attributes:
def_values[a] = None
# if reseting global policy - set values to default
else:
def_values = _default_values
entry = ldap.get_entry(dn, def_values.keys())
entry.update(def_values)
try:
ldap.update_entry(entry)
except errors.EmptyModlist:
pass
if keys[-1] is not None:
# policy for user was deleted, retrieve global policy
dn = self.obj.get_dn(None)
entry_attrs = ldap.get_entry(dn, self.obj.default_attributes)
entry_attrs = entry_to_dict(entry_attrs, **options)
return dict(result=entry_attrs, value=pkey_to_value(keys[-1], options))
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