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community.general/plugins/modules/ldap_inc.py

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# Copyright (c) 2024, Philippe Duveau <pduvax@gmail.com>
# Copyright (c) 2019, Maciej Delmanowski <drybjed@gmail.com> (ldap_attrs.py)
# Copyright (c) 2017, Alexander Korinek <noles@a3k.net> (ldap_attrs.py)
# Copyright (c) 2016, Peter Sagerson <psagers@ignorare.net> (ldap_attrs.py)
# Copyright (c) 2016, Jiri Tyr <jiri.tyr@gmail.com> (ldap_attrs.py)
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later
# The code of this module is derived from that of ldap_attrs.py
from __future__ import absolute_import, division, print_function
__metaclass__ = type
DOCUMENTATION = r"""
module: ldap_inc
short_description: Use the Modify-Increment LDAP V3 feature to increment an attribute value
version_added: 10.2.0
description:
- Atomically increments the value of an attribute and return its new value.
notes:
- When implemented by the directory server, the module uses the ModifyIncrement extension defined in L(RFC4525, https://www.rfc-editor.org/rfc/rfc4525.html)
and the control PostRead. This extension and the control are implemented in OpenLdap but not all directory servers implement
them. In this case, the module automatically uses a more classic method based on two phases, first the current value is
read then the modify operation remove the old value and add the new one in a single request. If the value has changed
by a concurrent call then the remove action will fail. Then the sequence is retried 3 times before raising an error to
the playbook. In an heavy modification environment, the module does not guarante to be systematically successful.
- This only deals with integer attribute of an existing entry. To modify attributes of an entry, see M(community.general.ldap_attrs)
or to add or remove whole entries, see M(community.general.ldap_entry).
author:
- Philippe Duveau (@pduveau)
requirements:
- python-ldap
attributes:
check_mode:
support: full
diff_mode:
support: none
options:
dn:
required: true
type: str
description:
- The DN entry containing the attribute to increment.
attribute:
required: true
type: str
description:
- The attribute to increment.
increment:
required: false
type: int
default: 1
description:
- The value of the increment to apply.
method:
required: false
type: str
default: auto
choices: [auto, rfc4525, legacy]
description:
- If V(auto), the module determines automatically the method to use.
- If V(rfc4525) or V(legacy) force to use the corresponding method.
extends_documentation_fragment:
- community.general.ldap.documentation
- community.general.attributes
"""
EXAMPLES = r"""
- name: Increments uidNumber 1 Number for example.com
community.general.ldap_inc:
dn: "cn=uidNext,ou=unix-management,dc=example,dc=com"
attribute: "uidNumber"
increment: "1"
register: ldap_uidNumber_sequence
- name: Modifies the user to define its identification number (uidNumber) when incrementation is successful
community.general.ldap_attrs:
dn: "cn=john,ou=posix-users,dc=example,dc=com"
state: present
attributes:
- uidNumber: "{{ ldap_uidNumber_sequence.value }}"
when: ldap_uidNumber_sequence.incremented
"""
RETURN = r"""
incremented:
description:
- It is set to V(true) if the attribute value has changed.
returned: success
type: bool
sample: true
attribute:
description:
- The name of the attribute that was incremented.
returned: success
type: str
sample: uidNumber
value:
description:
- The new value after incrementing.
returned: success
type: str
sample: "2"
rfc4525:
description:
- Is V(true) if the method used to increment is based on RFC4525, V(false) if legacy.
returned: success
type: bool
sample: true
"""
from ansible.module_utils.basic import AnsibleModule, missing_required_lib
from ansible.module_utils.common.text.converters import to_native, to_bytes
from ansible_collections.community.general.plugins.module_utils import deps
from ansible_collections.community.general.plugins.module_utils.ldap import LdapGeneric, gen_specs, ldap_required_together
with deps.declare("ldap", reason=missing_required_lib('python-ldap')):
import ldap
import ldap.controls.readentry
class LdapInc(LdapGeneric):
def __init__(self, module):
LdapGeneric.__init__(self, module)
# Shortcuts
self.attr = self.module.params['attribute']
self.increment = self.module.params['increment']
self.method = self.module.params['method']
def inc_rfc4525(self):
return [(ldap.MOD_INCREMENT, self.attr, [to_bytes(str(self.increment))])]
def inc_legacy(self, curr_val, new_val):
return [(ldap.MOD_DELETE, self.attr, [to_bytes(curr_val)]),
(ldap.MOD_ADD, self.attr, [to_bytes(new_val)])]
def serverControls(self):
return [ldap.controls.readentry.PostReadControl(attrList=[self.attr])]
LDAP_MOD_INCREMENT = to_bytes("1.3.6.1.1.14")
def main():
module = AnsibleModule(
argument_spec=gen_specs(
attribute=dict(type='str', required=True),
increment=dict(type='int', default=1, required=False),
method=dict(type='str', default='auto', choices=['auto', 'rfc4525', 'legacy']),
),
supports_check_mode=True,
required_together=ldap_required_together(),
)
deps.validate(module)
# Instantiate the LdapAttr object
mod = LdapInc(module)
changed = False
ret = ""
rfc4525 = False
try:
if mod.increment != 0 and not module.check_mode:
changed = True
if mod.method != "auto":
rfc4525 = mod.method == "rfc425"
else:
rootDSE = mod.connection.search_ext_s(
base="",
scope=ldap.SCOPE_BASE,
attrlist=["*", "+"])
if len(rootDSE) == 1:
if to_bytes(ldap.CONTROL_POST_READ) in rootDSE[0][1]["supportedControl"] and (
mod.LDAP_MOD_INCREMENT in rootDSE[0][1]["supportedFeatures"] or
mod.LDAP_MOD_INCREMENT in rootDSE[0][1]["supportedExtension"]
):
rfc4525 = True
if rfc4525:
dummy, dummy, dummy, resp_ctrls = mod.connection.modify_ext_s(
dn=mod.dn,
modlist=mod.inc_rfc4525(),
serverctrls=mod.serverControls(),
clientctrls=None)
if len(resp_ctrls) == 1:
ret = resp_ctrls[0].entry[mod.attr][0]
else:
tries = 0
max_tries = 3
while tries < max_tries:
tries = tries + 1
result = mod.connection.search_ext_s(
base=mod.dn,
scope=ldap.SCOPE_BASE,
filterstr="(%s=*)" % mod.attr,
attrlist=[mod.attr])
if len(result) != 1:
module.fail_json(msg="The entry does not exist or does not contain the specified attribute.")
return
try:
ret = str(int(result[0][1][mod.attr][0]) + mod.increment)
# if the current value first arg in inc_legacy has changed then the modify will fail
mod.connection.modify_s(
dn=mod.dn,
modlist=mod.inc_legacy(result[0][1][mod.attr][0], ret))
break
except ldap.NO_SUCH_ATTRIBUTE:
if tries == max_tries:
module.fail_json(msg="The increment could not be applied after " + str(max_tries) + " tries.")
return
else:
result = mod.connection.search_ext_s(
base=mod.dn,
scope=ldap.SCOPE_BASE,
filterstr="(%s=*)" % mod.attr,
attrlist=[mod.attr])
if len(result) == 1:
ret = str(int(result[0][1][mod.attr][0]) + mod.increment)
changed = mod.increment != 0
else:
module.fail_json(msg="The entry does not exist or does not contain the specified attribute.")
except Exception as e:
module.fail_json(msg="Attribute action failed.", details=to_native(e))
module.exit_json(changed=changed, incremented=changed, attribute=mod.attr, value=ret, rfc4525=rfc4525)
if __name__ == '__main__':
main()
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