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community.general/plugins/modules/consul_acl.py
Alexei Znamensky 26df6c7657
use dict comprehension in plugins, part 3 (#8833) 
* use dict comprehension in plugins, part 3

* add changelog frag
2024-09-08 14:22:37 +02:00

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#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2015, Steve Gargan <steve.gargan@gmail.com>
# 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
from __future__ import absolute_import, division, print_function
__metaclass__ = type
DOCUMENTATION = '''
module: consul_acl
short_description: Manipulate Consul ACL keys and rules
description:
- Allows the addition, modification and deletion of ACL keys and associated
rules in a consul cluster via the agent. For more details on using and
configuring ACLs, see https://www.consul.io/docs/guides/acl.html.
author:
- Steve Gargan (@sgargan)
- Colin Nolan (@colin-nolan)
extends_documentation_fragment:
- community.general.attributes
attributes:
check_mode:
support: none
diff_mode:
support: none
deprecated:
removed_in: 10.0.0
why: The legacy ACL system was removed from Consul.
alternative: Use M(community.general.consul_token) and/or M(community.general.consul_policy) instead.
options:
mgmt_token:
description:
- a management token is required to manipulate the acl lists
required: true
type: str
state:
description:
- whether the ACL pair should be present or absent
required: false
choices: ['present', 'absent']
default: present
type: str
token_type:
description:
- the type of token that should be created
choices: ['client', 'management']
default: client
type: str
name:
description:
- the name that should be associated with the acl key, this is opaque
to Consul
required: false
type: str
token:
description:
- the token key identifying an ACL rule set. If generated by consul
this will be a UUID
required: false
type: str
rules:
type: list
elements: dict
description:
- rules that should be associated with a given token
required: false
host:
description:
- host of the consul agent defaults to localhost
required: false
default: localhost
type: str
port:
type: int
description:
- the port on which the consul agent is running
required: false
default: 8500
scheme:
description:
- the protocol scheme on which the consul agent is running
required: false
default: http
type: str
validate_certs:
type: bool
description:
- whether to verify the tls certificate of the consul agent
required: false
default: true
requirements:
- python-consul
- pyhcl
- requests
'''
EXAMPLES = """
- name: Create an ACL with rules
community.general.consul_acl:
host: consul1.example.com
mgmt_token: some_management_acl
name: Foo access
rules:
- key: "foo"
policy: read
- key: "private/foo"
policy: deny
- name: Create an ACL with a specific token
community.general.consul_acl:
host: consul1.example.com
mgmt_token: some_management_acl
name: Foo access
token: my-token
rules:
- key: "foo"
policy: read
- name: Update the rules associated to an ACL token
community.general.consul_acl:
host: consul1.example.com
mgmt_token: some_management_acl
name: Foo access
token: some_client_token
rules:
- event: "bbq"
policy: write
- key: "foo"
policy: read
- key: "private"
policy: deny
- keyring: write
- node: "hgs4"
policy: write
- operator: read
- query: ""
policy: write
- service: "consul"
policy: write
- session: "standup"
policy: write
- name: Remove a token
community.general.consul_acl:
host: consul1.example.com
mgmt_token: some_management_acl
token: 172bd5c8-9fe9-11e4-b1b0-3c15c2c9fd5e
state: absent
"""
RETURN = """
token:
description: the token associated to the ACL (the ACL's ID)
returned: success
type: str
sample: a2ec332f-04cf-6fba-e8b8-acf62444d3da
rules:
description: the HCL JSON representation of the rules associated to the ACL, in the format described in the
Consul documentation (https://www.consul.io/docs/guides/acl.html#rule-specification).
returned: when O(state=present)
type: dict
sample: {
"key": {
"foo": {
"policy": "write"
},
"bar": {
"policy": "deny"
}
}
}
operation:
description: the operation performed on the ACL
returned: changed
type: str
sample: update
"""
try:
import consul
python_consul_installed = True
except ImportError:
python_consul_installed = False
try:
import hcl
pyhcl_installed = True
except ImportError:
pyhcl_installed = False
try:
from requests.exceptions import ConnectionError
has_requests = True
except ImportError:
has_requests = False
from collections import defaultdict
from ansible.module_utils.basic import to_text, AnsibleModule
RULE_SCOPES = [
"agent",
"agent_prefix",
"event",
"event_prefix",
"key",
"key_prefix",
"keyring",
"node",
"node_prefix",
"operator",
"query",
"query_prefix",
"service",
"service_prefix",
"session",
"session_prefix",
]
MANAGEMENT_PARAMETER_NAME = "mgmt_token"
HOST_PARAMETER_NAME = "host"
SCHEME_PARAMETER_NAME = "scheme"
VALIDATE_CERTS_PARAMETER_NAME = "validate_certs"
NAME_PARAMETER_NAME = "name"
PORT_PARAMETER_NAME = "port"
RULES_PARAMETER_NAME = "rules"
STATE_PARAMETER_NAME = "state"
TOKEN_PARAMETER_NAME = "token"
TOKEN_TYPE_PARAMETER_NAME = "token_type"
PRESENT_STATE_VALUE = "present"
ABSENT_STATE_VALUE = "absent"
CLIENT_TOKEN_TYPE_VALUE = "client"
MANAGEMENT_TOKEN_TYPE_VALUE = "management"
REMOVE_OPERATION = "remove"
UPDATE_OPERATION = "update"
CREATE_OPERATION = "create"
_POLICY_JSON_PROPERTY = "policy"
_RULES_JSON_PROPERTY = "Rules"
_TOKEN_JSON_PROPERTY = "ID"
_TOKEN_TYPE_JSON_PROPERTY = "Type"
_NAME_JSON_PROPERTY = "Name"
_POLICY_YML_PROPERTY = "policy"
_POLICY_HCL_PROPERTY = "policy"
_ARGUMENT_SPEC = {
MANAGEMENT_PARAMETER_NAME: dict(required=True, no_log=True),
HOST_PARAMETER_NAME: dict(default='localhost'),
SCHEME_PARAMETER_NAME: dict(default='http'),
VALIDATE_CERTS_PARAMETER_NAME: dict(type='bool', default=True),
NAME_PARAMETER_NAME: dict(),
PORT_PARAMETER_NAME: dict(default=8500, type='int'),
RULES_PARAMETER_NAME: dict(type='list', elements='dict'),
STATE_PARAMETER_NAME: dict(default=PRESENT_STATE_VALUE, choices=[PRESENT_STATE_VALUE, ABSENT_STATE_VALUE]),
TOKEN_PARAMETER_NAME: dict(no_log=False),
TOKEN_TYPE_PARAMETER_NAME: dict(choices=[CLIENT_TOKEN_TYPE_VALUE, MANAGEMENT_TOKEN_TYPE_VALUE],
default=CLIENT_TOKEN_TYPE_VALUE)
}
def set_acl(consul_client, configuration):
"""
Sets an ACL based on the given configuration.
:param consul_client: the consul client
:param configuration: the run configuration
:return: the output of setting the ACL
"""
acls_as_json = decode_acls_as_json(consul_client.acl.list())
existing_acls_mapped_by_name = {acl.name: acl for acl in acls_as_json if acl.name is not None}
existing_acls_mapped_by_token = {acl.token: acl for acl in acls_as_json}
if None in existing_acls_mapped_by_token:
raise AssertionError("expecting ACL list to be associated to a token: %s" %
existing_acls_mapped_by_token[None])
if configuration.token is None and configuration.name and configuration.name in existing_acls_mapped_by_name:
# No token but name given so can get token from name
configuration.token = existing_acls_mapped_by_name[configuration.name].token
if configuration.token and configuration.token in existing_acls_mapped_by_token:
return update_acl(consul_client, configuration)
else:
if configuration.token in existing_acls_mapped_by_token:
raise AssertionError()
if configuration.name in existing_acls_mapped_by_name:
raise AssertionError()
return create_acl(consul_client, configuration)
def update_acl(consul_client, configuration):
"""
Updates an ACL.
:param consul_client: the consul client
:param configuration: the run configuration
:return: the output of the update
"""
existing_acl = load_acl_with_token(consul_client, configuration.token)
changed = existing_acl.rules != configuration.rules
if changed:
name = configuration.name if configuration.name is not None else existing_acl.name
rules_as_hcl = encode_rules_as_hcl_string(configuration.rules)
updated_token = consul_client.acl.update(
configuration.token, name=name, type=configuration.token_type, rules=rules_as_hcl)
if updated_token != configuration.token:
raise AssertionError()
return Output(changed=changed, token=configuration.token, rules=configuration.rules, operation=UPDATE_OPERATION)
def create_acl(consul_client, configuration):
"""
Creates an ACL.
:param consul_client: the consul client
:param configuration: the run configuration
:return: the output of the creation
"""
rules_as_hcl = encode_rules_as_hcl_string(configuration.rules) if len(configuration.rules) > 0 else None
token = consul_client.acl.create(
name=configuration.name, type=configuration.token_type, rules=rules_as_hcl, acl_id=configuration.token)
rules = configuration.rules
return Output(changed=True, token=token, rules=rules, operation=CREATE_OPERATION)
def remove_acl(consul, configuration):
"""
Removes an ACL.
:param consul: the consul client
:param configuration: the run configuration
:return: the output of the removal
"""
token = configuration.token
changed = consul.acl.info(token) is not None
if changed:
consul.acl.destroy(token)
return Output(changed=changed, token=token, operation=REMOVE_OPERATION)
def load_acl_with_token(consul, token):
"""
Loads the ACL with the given token (token == rule ID).
:param consul: the consul client
:param token: the ACL "token"/ID (not name)
:return: the ACL associated to the given token
:exception ConsulACLTokenNotFoundException: raised if the given token does not exist
"""
acl_as_json = consul.acl.info(token)
if acl_as_json is None:
raise ConsulACLNotFoundException(token)
return decode_acl_as_json(acl_as_json)
def encode_rules_as_hcl_string(rules):
"""
Converts the given rules into the equivalent HCL (string) representation.
:param rules: the rules
:return: the equivalent HCL (string) representation of the rules. Will be None if there is no rules (see internal
note for justification)
"""
if len(rules) == 0:
# Note: empty string is not valid HCL according to `hcl.load` however, the ACL `Rule` property will be an empty
# string if there is no rules...
return None
rules_as_hcl = ""
for rule in rules:
rules_as_hcl += encode_rule_as_hcl_string(rule)
return rules_as_hcl
def encode_rule_as_hcl_string(rule):
"""
Converts the given rule into the equivalent HCL (string) representation.
:param rule: the rule
:return: the equivalent HCL (string) representation of the rule
"""
if rule.pattern is not None:
return '%s "%s" {\n %s = "%s"\n}\n' % (rule.scope, rule.pattern, _POLICY_HCL_PROPERTY, rule.policy)
else:
return '%s = "%s"\n' % (rule.scope, rule.policy)
def decode_rules_as_hcl_string(rules_as_hcl):
"""
Converts the given HCL (string) representation of rules into a list of rule domain models.
:param rules_as_hcl: the HCL (string) representation of a collection of rules
:return: the equivalent domain model to the given rules
"""
rules_as_hcl = to_text(rules_as_hcl)
rules_as_json = hcl.loads(rules_as_hcl)
return decode_rules_as_json(rules_as_json)
def decode_rules_as_json(rules_as_json):
"""
Converts the given JSON representation of rules into a list of rule domain models.
:param rules_as_json: the JSON representation of a collection of rules
:return: the equivalent domain model to the given rules
"""
rules = RuleCollection()
for scope in rules_as_json:
if not isinstance(rules_as_json[scope], dict):
rules.add(Rule(scope, rules_as_json[scope]))
else:
for pattern, policy in rules_as_json[scope].items():
rules.add(Rule(scope, policy[_POLICY_JSON_PROPERTY], pattern))
return rules
def encode_rules_as_json(rules):
"""
Converts the given rules into the equivalent JSON representation according to the documentation:
https://www.consul.io/docs/guides/acl.html#rule-specification.
:param rules: the rules
:return: JSON representation of the given rules
"""
rules_as_json = defaultdict(dict)
for rule in rules:
if rule.pattern is not None:
if rule.pattern in rules_as_json[rule.scope]:
raise AssertionError()
rules_as_json[rule.scope][rule.pattern] = {
_POLICY_JSON_PROPERTY: rule.policy
}
else:
if rule.scope in rules_as_json:
raise AssertionError()
rules_as_json[rule.scope] = rule.policy
return rules_as_json
def decode_rules_as_yml(rules_as_yml):
"""
Converts the given YAML representation of rules into a list of rule domain models.
:param rules_as_yml: the YAML representation of a collection of rules
:return: the equivalent domain model to the given rules
"""
rules = RuleCollection()
if rules_as_yml:
for rule_as_yml in rules_as_yml:
rule_added = False
for scope in RULE_SCOPES:
if scope in rule_as_yml:
if rule_as_yml[scope] is None:
raise ValueError("Rule for '%s' does not have a value associated to the scope" % scope)
policy = rule_as_yml[_POLICY_YML_PROPERTY] if _POLICY_YML_PROPERTY in rule_as_yml \
else rule_as_yml[scope]
pattern = rule_as_yml[scope] if _POLICY_YML_PROPERTY in rule_as_yml else None
rules.add(Rule(scope, policy, pattern))
rule_added = True
break
if not rule_added:
raise ValueError("A rule requires one of %s and a policy." % ('/'.join(RULE_SCOPES)))
return rules
def decode_acl_as_json(acl_as_json):
"""
Converts the given JSON representation of an ACL into the equivalent domain model.
:param acl_as_json: the JSON representation of an ACL
:return: the equivalent domain model to the given ACL
"""
rules_as_hcl = acl_as_json[_RULES_JSON_PROPERTY]
rules = decode_rules_as_hcl_string(acl_as_json[_RULES_JSON_PROPERTY]) if rules_as_hcl.strip() != "" \
else RuleCollection()
return ACL(
rules=rules,
token_type=acl_as_json[_TOKEN_TYPE_JSON_PROPERTY],
token=acl_as_json[_TOKEN_JSON_PROPERTY],
name=acl_as_json[_NAME_JSON_PROPERTY]
)
def decode_acls_as_json(acls_as_json):
"""
Converts the given JSON representation of ACLs into a list of ACL domain models.
:param acls_as_json: the JSON representation of a collection of ACLs
:return: list of equivalent domain models for the given ACLs (order not guaranteed to be the same)
"""
return [decode_acl_as_json(acl_as_json) for acl_as_json in acls_as_json]
class ConsulACLNotFoundException(Exception):
"""
Exception raised if an ACL with is not found.
"""
class Configuration:
"""
Configuration for this module.
"""
def __init__(self, management_token=None, host=None, scheme=None, validate_certs=None, name=None, port=None,
rules=None, state=None, token=None, token_type=None):
self.management_token = management_token # type: str
self.host = host # type: str
self.scheme = scheme # type: str
self.validate_certs = validate_certs # type: bool
self.name = name # type: str
self.port = port # type: int
self.rules = rules # type: RuleCollection
self.state = state # type: str
self.token = token # type: str
self.token_type = token_type # type: str
class Output:
"""
Output of an action of this module.
"""
def __init__(self, changed=None, token=None, rules=None, operation=None):
self.changed = changed # type: bool
self.token = token # type: str
self.rules = rules # type: RuleCollection
self.operation = operation # type: str
class ACL:
"""
Consul ACL. See: https://www.consul.io/docs/guides/acl.html.
"""
def __init__(self, rules, token_type, token, name):
self.rules = rules
self.token_type = token_type
self.token = token
self.name = name
def __eq__(self, other):
return other \
and isinstance(other, self.__class__) \
and self.rules == other.rules \
and self.token_type == other.token_type \
and self.token == other.token \
and self.name == other.name
def __hash__(self):
return hash(self.rules) ^ hash(self.token_type) ^ hash(self.token) ^ hash(self.name)
class Rule:
"""
ACL rule. See: https://www.consul.io/docs/guides/acl.html#acl-rules-and-scope.
"""
def __init__(self, scope, policy, pattern=None):
self.scope = scope
self.policy = policy
self.pattern = pattern
def __eq__(self, other):
return isinstance(other, self.__class__) \
and self.scope == other.scope \
and self.policy == other.policy \
and self.pattern == other.pattern
def __ne__(self, other):
return not self.__eq__(other)
def __hash__(self):
return (hash(self.scope) ^ hash(self.policy)) ^ hash(self.pattern)
def __str__(self):
return encode_rule_as_hcl_string(self)
class RuleCollection:
"""
Collection of ACL rules, which are part of a Consul ACL.
"""
def __init__(self):
self._rules = {}
for scope in RULE_SCOPES:
self._rules[scope] = {}
def __iter__(self):
all_rules = []
for scope, pattern_keyed_rules in self._rules.items():
for pattern, rule in pattern_keyed_rules.items():
all_rules.append(rule)
return iter(all_rules)
def __len__(self):
count = 0
for scope in RULE_SCOPES:
count += len(self._rules[scope])
return count
def __eq__(self, other):
return isinstance(other, self.__class__) \
and set(self) == set(other)
def __ne__(self, other):
return not self.__eq__(other)
def __str__(self):
return encode_rules_as_hcl_string(self)
def add(self, rule):
"""
Adds the given rule to this collection.
:param rule: model of a rule
:raises ValueError: raised if there already exists a rule for a given scope and pattern
"""
if rule.pattern in self._rules[rule.scope]:
patten_info = " and pattern '%s'" % rule.pattern if rule.pattern is not None else ""
raise ValueError("Duplicate rule for scope '%s'%s" % (rule.scope, patten_info))
self._rules[rule.scope][rule.pattern] = rule
def get_consul_client(configuration):
"""
Gets a Consul client for the given configuration.
Does not check if the Consul client can connect.
:param configuration: the run configuration
:return: Consul client
"""
token = configuration.management_token
if token is None:
token = configuration.token
if token is None:
raise AssertionError("Expecting the management token to always be set")
return consul.Consul(host=configuration.host, port=configuration.port, scheme=configuration.scheme,
verify=configuration.validate_certs, token=token)
def check_dependencies():
"""
Checks that the required dependencies have been imported.
:exception ImportError: if it is detected that any of the required dependencies have not been imported
"""
if not python_consul_installed:
raise ImportError("python-consul required for this module. "
"See: https://python-consul.readthedocs.io/en/latest/#installation")
if not pyhcl_installed:
raise ImportError("pyhcl required for this module. "
"See: https://pypi.org/project/pyhcl/")
if not has_requests:
raise ImportError("requests required for this module. See https://pypi.org/project/requests/")
def main():
"""
Main method.
"""
module = AnsibleModule(_ARGUMENT_SPEC, supports_check_mode=False)
try:
check_dependencies()
except ImportError as e:
module.fail_json(msg=str(e))
configuration = Configuration(
management_token=module.params.get(MANAGEMENT_PARAMETER_NAME),
host=module.params.get(HOST_PARAMETER_NAME),
scheme=module.params.get(SCHEME_PARAMETER_NAME),
validate_certs=module.params.get(VALIDATE_CERTS_PARAMETER_NAME),
name=module.params.get(NAME_PARAMETER_NAME),
port=module.params.get(PORT_PARAMETER_NAME),
rules=decode_rules_as_yml(module.params.get(RULES_PARAMETER_NAME)),
state=module.params.get(STATE_PARAMETER_NAME),
token=module.params.get(TOKEN_PARAMETER_NAME),
token_type=module.params.get(TOKEN_TYPE_PARAMETER_NAME)
)
consul_client = get_consul_client(configuration)
try:
if configuration.state == PRESENT_STATE_VALUE:
output = set_acl(consul_client, configuration)
else:
output = remove_acl(consul_client, configuration)
except ConnectionError as e:
module.fail_json(msg='Could not connect to consul agent at %s:%s, error was %s' % (
configuration.host, configuration.port, str(e)))
raise
return_values = dict(changed=output.changed, token=output.token, operation=output.operation)
if output.rules is not None:
return_values["rules"] = encode_rules_as_json(output.rules)
module.exit_json(**return_values)
if __name__ == "__main__":
main()
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