freeipa/ipaserver/plugins/pwpolicy.py
Rob Crittenden 36591995ac Fix upper bound of password policy grace limit
It was defined as an unsigned value (2**32) because it
originally was. During the review an additional setting of
disabled (-1) was added so the value needed to be signed.
The upper bound needs to be 2**31 which is provided by
the xmlrpc client MAXINT import.

Fixes: https://pagure.io/freeipa/issue/9243

Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Michal Polovka <mpolovka@redhat.com>
2022-09-20 14:51:56 -04:00

714 lines
27 KiB
Python

# Authors:
# Pavel Zuna <pzuna@redhat.com>
# Martin Kosek <mkosek@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/>.
import logging
from ipalib import api
from ipalib import Int, Str, DNParam, Bool
from ipalib import errors
from .baseldap import (
LDAPObject,
LDAPCreate,
LDAPDelete,
LDAPUpdate,
LDAPRetrieve,
LDAPSearch)
from ipalib import _
from ipalib.plugable import Registry
from ipalib.request import context
from ipapython.dn import DN
import six
if six.PY3:
unicode = str
__doc__ = _("""
Password policy
A password policy sets limitations on IPA passwords, including maximum
lifetime, minimum lifetime, the number of passwords to save in
history, the number of character classes required (for stronger passwords)
and the minimum password length.
By default there is a single, global policy for all users. You can also
create a password policy to apply to a group. Each user is only subject
to one password policy, either the group policy or the global policy. A
group policy stands alone; it is not a super-set of the global policy plus
custom settings.
Each group password policy requires a unique priority setting. If a user
is in multiple groups that have password policies, this priority determines
which password policy is applied. A lower value indicates a higher priority
policy.
Group password policies are automatically removed when the groups they
are associated with are removed.
Grace period defines the number of LDAP logins allowed after expiration.
-1 means do not enforce expiration to match previous behavior. 0 allows
no additional logins after expiration.
EXAMPLES:
Modify the global policy:
ipa pwpolicy-mod --minlength=10
Add a new group password policy:
ipa pwpolicy-add --maxlife=90 --minlife=1 --history=10 --minclasses=3 --minlength=8 --priority=10 localadmins
Display the global password policy:
ipa pwpolicy-show
Display a group password policy:
ipa pwpolicy-show localadmins
Display the policy that would be applied to a given user:
ipa pwpolicy-show --user=tuser1
Modify a group password policy:
ipa pwpolicy-mod --minclasses=2 localadmins
""")
logger = logging.getLogger(__name__)
register = Registry()
@register()
class cosentry(LDAPObject):
__doc__ = _('Class of Service object used for linking policies with'
' groups')
NO_CLI = True
container_dn = DN(('cn', 'costemplates'), api.env.container_accounts)
object_class = ['top', 'costemplate', 'extensibleobject', 'krbcontainer']
permission_filter_objectclasses = ['costemplate']
default_attributes = ['cn', 'cospriority', 'krbpwdpolicyreference']
managed_permissions = {
'System: Read Group Password Policy costemplate': {
'replaces_global_anonymous_aci': True,
'ipapermright': {'read', 'search', 'compare'},
'ipapermdefaultattr': {
'cn', 'cospriority', 'krbpwdpolicyreference', 'objectclass',
},
'default_privileges': {
'Password Policy Readers',
'Password Policy Administrator',
},
},
'System: Add Group Password Policy costemplate': {
'ipapermright': {'add'},
'replaces': [
'(target = "ldap:///cn=*,cn=costemplates,cn=accounts,$SUFFIX")(version 3.0;acl "permission:Add Group Password Policy costemplate";allow (add) groupdn = "ldap:///cn=Add Group Password Policy costemplate,cn=permissions,cn=pbac,$SUFFIX";)',
],
'default_privileges': {'Password Policy Administrator'},
},
'System: Delete Group Password Policy costemplate': {
'ipapermright': {'delete'},
'replaces': [
'(target = "ldap:///cn=*,cn=costemplates,cn=accounts,$SUFFIX")(version 3.0;acl "permission:Delete Group Password Policy costemplate";allow (delete) groupdn = "ldap:///cn=Delete Group Password Policy costemplate,cn=permissions,cn=pbac,$SUFFIX";)',
],
'default_privileges': {'Password Policy Administrator'},
},
'System: Modify Group Password Policy costemplate': {
'ipapermright': {'write'},
'ipapermdefaultattr': {'cospriority'},
'replaces': [
'(targetattr = "cospriority")(target = "ldap:///cn=*,cn=costemplates,cn=accounts,$SUFFIX")(version 3.0;acl "permission:Modify Group Password Policy costemplate";allow (write) groupdn = "ldap:///cn=Modify Group Password Policy costemplate,cn=permissions,cn=pbac,$SUFFIX";)',
],
'default_privileges': {'Password Policy Administrator'},
},
}
takes_params = (
Str('cn', primary_key=True),
DNParam('krbpwdpolicyreference'),
Int('cospriority', minvalue=0),
)
priority_not_unique_msg = _(
'priority must be a unique value (%(prio)d already used by %(gname)s)'
)
def get_dn(self, *keys, **options):
group_dn = self.api.Object.group.get_dn(keys[-1])
return self.backend.make_dn_from_attr(
'cn', group_dn, DN(self.container_dn, api.env.basedn)
)
def check_priority_uniqueness(self, *keys, **options):
if options.get('cospriority') is not None:
entries = self.methods.find(
cospriority=options['cospriority']
)['result']
if len(entries) > 0:
group_name = self.api.Object.group.get_primary_key_from_dn(
DN(entries[0]['cn'][0]))
raise errors.ValidationError(
name='priority',
error=self.priority_not_unique_msg % {
'prio': options['cospriority'],
'gname': group_name,
}
)
@register()
class cosentry_add(LDAPCreate):
__doc__ = _('Add Class of Service entry')
NO_CLI = True
def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
assert isinstance(dn, DN)
# check for existence of the group
group_dn = self.api.Object.group.get_dn(keys[-1])
try:
result = ldap.get_entry(group_dn, ['objectclass'])
except errors.NotFound:
raise self.api.Object.group.handle_not_found(keys[-1])
oc = [x.lower() for x in result['objectclass']]
if 'mepmanagedentry' in oc:
raise errors.ManagedPolicyError()
self.obj.check_priority_uniqueness(*keys, **options)
del entry_attrs['cn']
return dn
@register()
class cosentry_del(LDAPDelete):
__doc__ = _('Delete Class of Service entry')
NO_CLI = True
@register()
class cosentry_mod(LDAPUpdate):
__doc__ = _('Modify Class of Service entry')
NO_CLI = True
def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
assert isinstance(dn, DN)
new_cospriority = options.get('cospriority')
if new_cospriority is not None:
cos_entry = self.api.Command.cosentry_show(keys[-1])['result']
old_cospriority = int(cos_entry['cospriority'][0])
# check uniqueness only when the new priority differs
if old_cospriority != new_cospriority:
self.obj.check_priority_uniqueness(*keys, **options)
return dn
@register()
class cosentry_show(LDAPRetrieve):
__doc__ = _('Display Class of Service entry')
NO_CLI = True
@register()
class cosentry_find(LDAPSearch):
__doc__ = _('Search for Class of Service entry')
NO_CLI = True
global_policy_name = 'global_policy'
global_policy_dn = DN(('cn', global_policy_name), ('cn', api.env.realm), ('cn', 'kerberos'), api.env.basedn)
@register()
class pwpolicy(LDAPObject):
"""
Password Policy object
"""
container_dn = DN(('cn', api.env.realm), ('cn', 'kerberos'))
object_name = _('password policy')
object_name_plural = _('password policies')
object_class = ['top', 'nscontainer', 'krbpwdpolicy', 'ipapwdpolicy']
permission_filter_objectclasses = ['krbpwdpolicy', 'ipapwdpolicy']
default_attributes = [
'cn', 'cospriority', 'krbmaxpwdlife', 'krbminpwdlife',
'krbpwdhistorylength', 'krbpwdmindiffchars', 'krbpwdminlength',
'krbpwdmaxfailure', 'krbpwdfailurecountinterval',
'krbpwdlockoutduration', 'ipapwdmaxrepeat',
'ipapwdmaxsequence', 'ipapwddictcheck',
'ipapwdusercheck', 'passwordgracelimit',
]
managed_permissions = {
'System: Read Group Password Policy': {
'replaces_global_anonymous_aci': True,
'ipapermbindruletype': 'permission',
'ipapermright': {'read', 'search', 'compare'},
'ipapermdefaultattr': {
'cn', 'cospriority', 'krbmaxpwdlife', 'krbminpwdlife',
'krbpwdfailurecountinterval', 'krbpwdhistorylength',
'krbpwdlockoutduration', 'krbpwdmaxfailure',
'krbpwdmindiffchars', 'krbpwdminlength', 'objectclass',
'ipapwdmaxrepeat', 'ipapwdmaxsequence', 'ipapwddictcheck',
'ipapwdusercheck', 'passwordgracelimit',
},
'default_privileges': {
'Password Policy Readers',
'Password Policy Administrator',
},
},
'System: Add Group Password Policy': {
'ipapermright': {'add'},
'replaces': [
'(target = "ldap:///cn=*,cn=$REALM,cn=kerberos,$SUFFIX")(version 3.0;acl "permission:Add Group Password Policy";allow (add) groupdn = "ldap:///cn=Add Group Password Policy,cn=permissions,cn=pbac,$SUFFIX";)',
],
'default_privileges': {'Password Policy Administrator'},
},
'System: Delete Group Password Policy': {
'ipapermright': {'delete'},
'replaces': [
'(target = "ldap:///cn=*,cn=$REALM,cn=kerberos,$SUFFIX")(version 3.0;acl "permission:Delete Group Password Policy";allow (delete) groupdn = "ldap:///cn=Delete Group Password Policy,cn=permissions,cn=pbac,$SUFFIX";)',
],
'default_privileges': {'Password Policy Administrator'},
},
'System: Modify Group Password Policy': {
'ipapermright': {'write'},
'ipapermdefaultattr': {
'krbmaxpwdlife', 'krbminpwdlife', 'krbpwdfailurecountinterval',
'krbpwdhistorylength', 'krbpwdlockoutduration',
'krbpwdmaxfailure', 'krbpwdmindiffchars', 'krbpwdminlength',
'ipapwdmaxrepeat', 'ipapwdmaxsequence', 'ipapwddictcheck',
'ipapwdusercheck', 'passwordgracelimit',
},
'replaces': [
'(targetattr = "krbmaxpwdlife || krbminpwdlife || krbpwdhistorylength || krbpwdmindiffchars || krbpwdminlength || krbpwdmaxfailure || krbpwdfailurecountinterval || krbpwdlockoutduration")(target = "ldap:///cn=*,cn=$REALM,cn=kerberos,$SUFFIX")(version 3.0;acl "permission:Modify Group Password Policy";allow (write) groupdn = "ldap:///cn=Modify Group Password Policy,cn=permissions,cn=pbac,$SUFFIX";)',
],
'default_privileges': {'Password Policy Administrator'},
},
}
label = _('Password Policies')
label_singular = _('Password Policy')
takes_params = (
Str('cn?',
cli_name='group',
label=_('Group'),
doc=_('Manage password policy for specific group'),
primary_key=True,
),
Int('krbmaxpwdlife?',
cli_name='maxlife',
label=_('Max lifetime (days)'),
doc=_('Maximum password lifetime (in days)'),
minvalue=0,
maxvalue=20000, # a little over 54 years
),
Int('krbminpwdlife?',
cli_name='minlife',
label=_('Min lifetime (hours)'),
doc=_('Minimum password lifetime (in hours)'),
minvalue=0,
),
Int('krbpwdhistorylength?',
cli_name='history',
label=_('History size'),
doc=_('Password history size'),
minvalue=0,
),
Int('krbpwdmindiffchars?',
cli_name='minclasses',
label=_('Character classes'),
doc=_('Minimum number of character classes'),
minvalue=0,
maxvalue=5,
),
Int('krbpwdminlength?',
cli_name='minlength',
label=_('Min length'),
doc=_('Minimum length of password'),
minvalue=0,
),
Int('cospriority',
cli_name='priority',
label=_('Priority'),
doc=_('Priority of the policy (higher number means lower priority'),
minvalue=0,
flags=('virtual_attribute',),
),
Int(
'krbpwdmaxfailure?',
cli_name='maxfail',
label=_('Max failures'),
doc=_('Consecutive failures before lockout'),
minvalue=0,
),
Int(
'krbpwdfailurecountinterval?',
cli_name='failinterval',
label=_('Failure reset interval'),
doc=_('Period after which failure count will be reset (seconds)'),
minvalue=0,
),
Int(
'krbpwdlockoutduration?',
cli_name='lockouttime',
label=_('Lockout duration'),
doc=_('Period for which lockout is enforced (seconds)'),
minvalue=0,
),
Int(
'ipapwdmaxrepeat?',
cli_name='maxrepeat',
label=_('Max repeat'),
doc=_('Maximum number of same consecutive characters'),
minvalue=0,
maxvalue=256,
default=0,
),
Int(
'ipapwdmaxsequence?',
cli_name='maxsequence',
label=_('Max sequence'),
doc=_('The max. length of monotonic character sequences (abcd)'),
minvalue=0,
maxvalue=256,
default=0,
),
Bool(
'ipapwddictcheck?',
cli_name='dictcheck',
label=_('Dictionary check'),
doc=_('Check if the password is a dictionary word'),
default=False,
),
Bool(
'ipapwdusercheck?',
cli_name='usercheck',
label=_('User check'),
doc=_('Check if the password contains the username'),
default=False,
),
Int(
'passwordgracelimit?',
cli_name='gracelimit',
label=_('Grace login limit'),
doc=_('Number of LDAP authentications allowed after expiration'),
minvalue=-1,
maxvalue=Int.MAXINT,
default=-1,
autofill=True,
),
)
def get_dn(self, *keys, **options):
if keys[-1] is not None:
return self.backend.make_dn_from_attr(
self.primary_key.name, keys[-1],
DN(self.container_dn, api.env.basedn)
)
return global_policy_dn
def convert_time_for_output(self, entry_attrs, **options):
# Convert seconds to hours and days for displaying to user
if not options.get('raw', False):
if 'krbmaxpwdlife' in entry_attrs:
entry_attrs['krbmaxpwdlife'][0] = unicode(
int(entry_attrs['krbmaxpwdlife'][0]) // 86400
)
if 'krbminpwdlife' in entry_attrs:
entry_attrs['krbminpwdlife'][0] = unicode(
int(entry_attrs['krbminpwdlife'][0]) // 3600
)
def convert_time_on_input(self, entry_attrs):
# Convert hours and days to seconds for writing to LDAP
if 'krbmaxpwdlife' in entry_attrs and entry_attrs['krbmaxpwdlife']:
entry_attrs['krbmaxpwdlife'] = entry_attrs['krbmaxpwdlife'] * 86400
if 'krbminpwdlife' in entry_attrs and entry_attrs['krbminpwdlife']:
entry_attrs['krbminpwdlife'] = entry_attrs['krbminpwdlife'] * 3600
def validate_minlength(self, ldap, entry_attrs, add=False, *keys):
"""
If any of the libpwquality options are used then the minimum
length must be >= 6 which is the built-in default of libpwquality.
Allowing a lower value to be set will result in a failed policy
check and a generic error message.
"""
def get_val(entry, attr):
"""Get a single value from a list or a string"""
val = entry.get(attr, 0)
if isinstance(val, list):
val = val[0]
return val
def has_pwquality_set(entry):
for attr in ['ipapwdmaxrepeat', 'ipapwdmaxsequence',
'ipapwddictcheck', 'ipapwdusercheck']:
val = get_val(entry, attr)
if val not in (False, 'FALSE', '0', 0, None):
return True
return False
has_pwquality_value = False
if not add:
if len(keys) > 0:
existing_entry = self.api.Command.pwpolicy_show(
keys[-1], all=True,)['result']
else:
existing_entry = self.api.Command.pwpolicy_show(
all=True,)['result']
existing_entry.update(entry_attrs)
min_length = int(get_val(existing_entry, 'krbpwdminlength'))
has_pwquality_value = has_pwquality_set(existing_entry)
else:
min_length = int(get_val(entry_attrs, 'krbpwdminlength'))
has_pwquality_value = has_pwquality_set(entry_attrs)
if min_length and min_length < 6 and has_pwquality_value:
raise errors.ValidationError(
name='minlength',
error=_('Minimum length must be >= 6 if maxrepeat, '
'maxsequence, dictcheck or usercheck are defined')
)
def validate_lifetime(self, entry_attrs, add=False, *keys):
"""
Ensure that the maximum lifetime is greater than the minimum.
If there is no minimum lifetime set then don't return an error.
"""
maxlife=entry_attrs.get('krbmaxpwdlife', None)
minlife=entry_attrs.get('krbminpwdlife', None)
existing_entry = {}
if not add: # then read existing entry
existing_entry = self.api.Command.pwpolicy_show(keys[-1],
all=True,
)['result']
if minlife is None and 'krbminpwdlife' in existing_entry:
minlife = int(existing_entry['krbminpwdlife'][0]) * 3600
if maxlife is None and 'krbmaxpwdlife' in existing_entry:
maxlife = int(existing_entry['krbmaxpwdlife'][0]) * 86400
if maxlife not in (None, 0) and minlife is not None:
if minlife > maxlife:
raise errors.ValidationError(
name='maxlife',
error=_(
"Maximum password life must be equal to "
"or greater than the minimum."
),
)
def add_cospriority(self, entry, pwpolicy_name, rights=True):
if pwpolicy_name and pwpolicy_name != global_policy_name:
cos_entry = self.api.Command.cosentry_show(
pwpolicy_name,
rights=rights, all=rights
)['result']
if cos_entry.get('cospriority') is not None:
entry['cospriority'] = cos_entry['cospriority']
if rights:
entry['attributelevelrights']['cospriority'] = \
cos_entry['attributelevelrights']['cospriority']
@register()
class pwpolicy_add(LDAPCreate):
__doc__ = _('Add a new group password policy.')
def get_args(self):
yield self.obj.primary_key.clone(attribute=True, required=True)
def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
assert isinstance(dn, DN)
self.obj.convert_time_on_input(entry_attrs)
self.obj.validate_lifetime(entry_attrs, True)
self.obj.validate_minlength(ldap, entry_attrs, True)
self.api.Command.cosentry_add(
keys[-1], krbpwdpolicyreference=dn,
cospriority=options.get('cospriority')
)
return dn
def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
assert isinstance(dn, DN)
logger.info('%r', entry_attrs)
# attribute rights are not allowed for pwpolicy_add
self.obj.add_cospriority(entry_attrs, keys[-1], rights=False)
self.obj.convert_time_for_output(entry_attrs, **options)
return dn
@register()
class pwpolicy_del(LDAPDelete):
__doc__ = _('Delete a group password policy.')
def get_args(self):
yield self.obj.primary_key.clone(
attribute=True, required=True, multivalue=True
)
def pre_callback(self, ldap, dn, *keys, **options):
assert isinstance(dn, DN)
if dn == global_policy_dn:
raise errors.ValidationError(
name='group',
error=_('cannot delete global password policy')
)
return dn
def post_callback(self, ldap, dn, *keys, **options):
assert isinstance(dn, DN)
try:
self.api.Command.cosentry_del(keys[-1])
except errors.NotFound:
pass
return True
@register()
class pwpolicy_mod(LDAPUpdate):
__doc__ = _('Modify a group password policy.')
def execute(self, cn=None, **options):
return super(pwpolicy_mod, self).execute(cn, **options)
def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
assert isinstance(dn, DN)
old_entry_attrs = ldap.get_entry(dn, ['objectclass'])
if not self.obj.has_objectclass(
old_entry_attrs['objectclass'], 'ipapwdpolicy'
):
old_entry_attrs['objectclass'].append('ipapwdpolicy')
entry_attrs['objectclass'] = old_entry_attrs['objectclass']
self.obj.convert_time_on_input(entry_attrs)
self.obj.validate_minlength(ldap, entry_attrs, False, *keys)
self.obj.validate_lifetime(entry_attrs, False, *keys)
setattr(context, 'cosupdate', False)
if options.get('cospriority') is not None:
if keys[-1] is None:
raise errors.ValidationError(
name='priority',
error=_('priority cannot be set on global policy')
)
try:
self.api.Command.cosentry_mod(
keys[-1], cospriority=options['cospriority']
)
except errors.EmptyModlist as e:
if len(entry_attrs) == 1: # cospriority only was passed
raise e
else:
setattr(context, 'cosupdate', True)
return dn
def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
assert isinstance(dn, DN)
rights = options.get('all', False) and options.get('rights', False)
self.obj.add_cospriority(entry_attrs, keys[-1], rights)
self.obj.convert_time_for_output(entry_attrs, **options)
return dn
def exc_callback(self, keys, options, exc, call_func, *call_args, **call_kwargs):
if call_func.__name__ == 'update_entry':
if isinstance(exc, errors.EmptyModlist):
entry_attrs = call_args[0]
cosupdate = getattr(context, 'cosupdate')
if not entry_attrs or cosupdate:
return
raise exc
@register()
class pwpolicy_show(LDAPRetrieve):
__doc__ = _('Display information about password policy.')
takes_options = LDAPRetrieve.takes_options + (
Str('user?',
label=_('User'),
doc=_('Display effective policy for a specific user'),
),
)
def execute(self, cn=None, **options):
return super(pwpolicy_show, self).execute(cn, **options)
def pre_callback(self, ldap, dn, attrs_list, *keys, **options):
assert isinstance(dn, DN)
if options.get('user') is not None:
user_entry = self.api.Command.user_show(
options['user'], all=True
)['result']
if 'krbpwdpolicyreference' in user_entry:
return user_entry.get('krbpwdpolicyreference', [dn])[0]
return dn
def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
assert isinstance(dn, DN)
rights = options.get('all', False) and options.get('rights', False)
self.obj.add_cospriority(entry_attrs, keys[-1], rights)
self.obj.convert_time_for_output(entry_attrs, **options)
return dn
@register()
class pwpolicy_find(LDAPSearch):
__doc__ = _('Search for group password policies.')
# this command does custom sorting in post_callback
sort_result_entries = False
def priority_sort_key(self, entry):
"""Key for sorting password policies
returns a pair: (is_global, priority)
"""
# global policy will be always last in the output
if entry['cn'][0] == global_policy_name:
return True, 0
else:
# policies with higher priority (lower number) will be at the
# beginning of the list
try:
cospriority = int(entry['cospriority'][0])
except KeyError:
# if cospriority is not present in the entry, rather return 0
# than crash
cospriority = 0
return False, cospriority
def post_callback(self, ldap, entries, truncated, *args, **options):
for e in entries:
# When pkey_only flag is on, entries should contain only a cn.
# Add a cospriority attribute that will be used for sorting.
# Attribute rights are not allowed for pwpolicy_find.
self.obj.add_cospriority(e, e['cn'][0], rights=False)
self.obj.convert_time_for_output(e, **options)
# do custom entry sorting by its cospriority
entries.sort(key=self.priority_sort_key)
if options.get('pkey_only', False):
# remove cospriority that was used for sorting
for e in entries:
try:
del e['cospriority']
except KeyError:
pass
return truncated