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passwordstore: Add configurable locking (#4194) (#4243)

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* passwordstore: Add configurable locking

Passwordstore cannot be accessed safely in parallel, which causes
various issues:

- When accessing the same path, multiple different secrets are
  returned when the secret didn't exist (missing=create).
- When accessing the same _or different_ paths, multiple pinentry
  dialogs will be spawned by gpg-agent sequentially, having to enter
  the password for the same gpg key multiple times in a row.
- Due to issues in gpg dependencies, accessing gpg-agent in parallel
  is not reliable, causing plays to fail (this can be fixed by adding
  `auto-expand-secmem` to _~/.gnupg/gpg-agent.conf_ though).

These problems have been described in various github issues in the past,
e.g., ansible/ansible#23816 and ansible/ansible#27277.

This cannot be worked around in playbooks by users in a non-error-prone
way.

It is addressed by adding new configuration options:

- lock:
  - readwrite: Lock all operations
  - write: Only lock write operations (default)
  - none: Disable locking
- locktimeout: Time to wait for getting a lock (s/m/h suffix)
  (defaults to 15m)

These options can also be set in ansible.cfg, e.g.:

    [passwordstore_lookup]
    lock=readwrite
    locktimeout=30s

Also, add a note about modifying gpg-agent.conf.

* Tidy up locking config

There is no reason why lock configuration should be part of self.paramvals.
Now locking and its configuration happen all in one place.

* Change timeout description wording to the suggested value.

* Rearrange plugin setup, apply PR feedback

(cherry picked from commit 2416b81aa4)

Co-authored-by: grembo <freebsd@grem.de>
This commit is contained in:
patchback[bot] 2022-02-21 21:37:47 +01:00 committed by GitHub
parent df6a00dc89
commit 3d2caf3933
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2 changed files with 118 additions and 50 deletions
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2
changelogs/fragments/4194-configurable-passwordstore-locking.yml Normal file
View file

@ -0,0 +1,2 @@
minor_changes:
- passwordstore lookup plugin - add configurable ``lock`` and ``locktimeout`` options to avoid race conditions in itself and in the ``pass`` utility it calls. By default, the plugin now locks on write operations (https://github.com/ansible-collections/community.general/pull/4194).

94
plugins/lookup/passwordstore.py
View file

@ -14,6 +14,8 @@ DOCUMENTATION = '''
description:
- Enables Ansible to retrieve, create or update passwords from the passwordstore.org pass utility.
It also retrieves YAML style keys stored as multilines in the passwordfile.
- To avoid problems when accessing multiple secrets at once, add C(auto-expand-secmem) to
C(~/.gnupg/gpg-agent.conf). Where this is not possible, consider using I(lock=readwrite) instead.
options:
_terms:
description: query key.
@ -77,52 +79,87 @@ DOCUMENTATION = '''
- warn
- empty
- create
lock:
description:
- How to synchronize operations.
- The default of C(write) only synchronizes write operations.
- C(readwrite) synchronizes all operations (including read). This makes sure that gpg-agent is never called in parallel.
- C(none) does not do any synchronization.
ini:
- section: passwordstore_lookup
key: lock
type: str
default: write
choices:
- readwrite
- write
- none
version_added: 4.5.0
locktimeout:
description:
- Lock timeout applied when I(lock) is not C(none).
- Time with a unit suffix, C(s), C(m), C(h) for seconds, minutes, and hours, respectively. For example, C(900s) equals C(15m).
- Correlates with C(pinentry-timeout) in C(~/.gnupg/gpg-agent.conf), see C(man gpg-agent) for details.
ini:
- section: passwordstore_lookup
key: locktimeout
type: str
default: 15m
version_added: 4.5.0
'''
EXAMPLES = """
# Debug is used for examples, BAD IDEA to show passwords on screen
- name: Basic lookup. Fails if example/test doesn't exist
ansible.cfg: |
[passwordstore_lookup]
lock=readwrite
locktimeout=45s
playbook.yml: |
---
# Debug is used for examples, BAD IDEA to show passwords on screen
- name: Basic lookup. Fails if example/test does not exist
ansible.builtin.debug:
msg: "{{ lookup('community.general.passwordstore', 'example/test')}}"
- name: Basic lookup. Warns if example/test does not exist and returns empty string
- name: Basic lookup. Warns if example/test does not exist and returns empty string
ansible.builtin.debug:
msg: "{{ lookup('community.general.passwordstore', 'example/test missing=warn')}}"
- name: Create pass with random 16 character password. If password exists just give the password
- name: Create pass with random 16 character password. If password exists just give the password
ansible.builtin.debug:
var: mypassword
vars:
mypassword: "{{ lookup('community.general.passwordstore', 'example/test create=true')}}"
- name: Create pass with random 16 character password. If password exists just give the password
- name: Create pass with random 16 character password. If password exists just give the password
ansible.builtin.debug:
var: mypassword
vars:
mypassword: "{{ lookup('community.general.passwordstore', 'example/test missing=create')}}"
- name: Prints 'abc' if example/test does not exist, just give the password otherwise
- name: Prints 'abc' if example/test does not exist, just give the password otherwise
ansible.builtin.debug:
var: mypassword
vars:
mypassword: "{{ lookup('community.general.passwordstore', 'example/test missing=empty') | default('abc', true) }}"
- name: Different size password
- name: Different size password
ansible.builtin.debug:
msg: "{{ lookup('community.general.passwordstore', 'example/test create=true length=42')}}"
- name: Create password and overwrite the password if it exists. As a bonus, this module includes the old password inside the pass file
- name: Create password and overwrite the password if it exists. As a bonus, this module includes the old password inside the pass file
ansible.builtin.debug:
msg: "{{ lookup('community.general.passwordstore', 'example/test create=true overwrite=true')}}"
- name: Create an alphanumeric password
- name: Create an alphanumeric password
ansible.builtin.debug:
msg: "{{ lookup('community.general.passwordstore', 'example/test create=true nosymbols=true') }}"
- name: Return the value for user in the KV pair user, username
- name: Return the value for user in the KV pair user, username
ansible.builtin.debug:
msg: "{{ lookup('community.general.passwordstore', 'example/test subkey=user')}}"
- name: Return the entire password file content
- name: Return the entire password file content
ansible.builtin.set_fact:
passfilecontent: "{{ lookup('community.general.passwordstore', 'example/test returnall=true')}}"
"""
@ -135,13 +172,15 @@ _raw:
elements: str
"""
from contextlib import contextmanager
import os
import re
import subprocess
import time
import yaml
from ansible.errors import AnsibleError, AnsibleAssertionError
from ansible.module_utils.common.file import FileLock
from ansible.module_utils.common.text.converters import to_bytes, to_native, to_text
from ansible.module_utils.parsing.convert_bool import boolean
from ansible.utils.display import Display
@ -328,8 +367,25 @@ class LookupModule(LookupBase):
else:
return None
def run(self, terms, variables, **kwargs):
result = []
@contextmanager
def opt_lock(self, type):
if self.get_option('lock') == type:
tmpdir = os.environ.get('TMPDIR', '/tmp')
lockfile = os.path.join(tmpdir, '.passwordstore.lock')
with FileLock().lock_file(lockfile, tmpdir, self.lock_timeout):
self.locked = type
yield
self.locked = None
else:
yield
def setup(self, variables):
self.locked = None
timeout = self.get_option('locktimeout')
if not re.match('^[0-9]+[smh]$', timeout):
raise AnsibleError("{0} is not a correct value for locktimeout".format(timeout))
unit_to_seconds = {"s": 1, "m": 60, "h": 3600}
self.lock_timeout = int(timeout[:-1]) * unit_to_seconds[timeout[-1]]
self.paramvals = {
'subkey': 'password',
'directory': variables.get('passwordstore', os.environ.get(
@ -345,15 +401,25 @@ class LookupModule(LookupBase):
'missing': 'error',
}
def run(self, terms, variables, **kwargs):
self.setup(variables)
result = []
for term in terms:
self.parse_params(term) # parse the input into paramvals
with self.opt_lock('readwrite'):
if self.check_pass(): # password exists
if self.paramvals['overwrite'] and self.paramvals['subkey'] == 'password':
with self.opt_lock('write'):
result.append(self.update_password())
else:
result.append(self.get_passresult())
else: # password does not exist
if self.paramvals['missing'] == 'create':
with self.opt_lock('write'):
if self.locked == 'write' and self.check_pass(): # lookup password again if under write lock
result.append(self.get_passresult())
else:
result.append(self.generate_password())
else:
result.append(None)