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ansible/system/authorized_key.py

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#!/usr/bin/python
# -*- coding: utf-8 -*-
"""
Ansible module to add authorized_keys for ssh logins.
(c) 2012, Brad Olson <brado@movedbylight.com>
This file is part of Ansible
Ansible 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.
Ansible 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 Ansible. If not, see <http://www.gnu.org/licenses/>.
"""
DOCUMENTATION = '''
---
module: authorized_key
short_description: Adds or removes an SSH authorized key
description:
- "Adds or removes SSH authorized keys for particular user accounts"
version_added: "0.5"
options:
user:
description:
- The username on the remote host whose authorized_keys file will be modified
required: true
key:
description:
- The SSH public key(s), as a string or (since 1.9) url (https://github.com/username.keys)
required: true
path:
description:
- Alternate path to the authorized_keys file
required: false
default: "(homedir)+/.ssh/authorized_keys"
version_added: "1.2"
manage_dir:
description:
- Whether this module should manage the directory of the authorized key file. If
set, the module will create the directory, as well as set the owner and permissions
of an existing directory. Be sure to
set C(manage_dir=no) if you are using an alternate directory for
authorized_keys, as set with C(path), since you could lock yourself out of
SSH access. See the example below.
required: false
choices: [ "yes", "no" ]
default: "yes"
version_added: "1.2"
state:
description:
- Whether the given key (with the given key_options) should or should not be in the file
required: false
choices: [ "present", "absent" ]
default: "present"
key_options:
description:
- A string of ssh key options to be prepended to the key in the authorized_keys file
required: false
default: null
version_added: "1.4"
exclusive:
description:
- Whether to remove all other non-specified keys from the authorized_keys file. Multiple keys
can be specified in a single C(key) string value by separating them by newlines.
- This option is not loop aware, so if you use C(with_) , it will be exclusive per iteration
of the loop, if you want multiple keys in the file you need to pass them all to C(key) in a
single batch as mentioned above.
required: false
choices: [ "yes", "no" ]
default: "no"
version_added: "1.9"
validate_certs:
description:
- This only applies if using a https url as the source of the keys. If set to C(no), the SSL certificates will not be validated.
- This should only set to C(no) used on personally controlled sites using self-signed certificates as it avoids verifying the source site.
- Prior to 2.1 the code worked as if this was set to C(yes).
required: false
default: "yes"
choices: ["yes", "no"]
version_added: "2.1"
author: "Ansible Core Team"
'''
EXAMPLES = '''
# Example using key data from a local file on the management machine
- authorized_key: user=charlie key="{{ lookup('file', '/home/charlie/.ssh/id_rsa.pub') }}"
# Using github url as key source
- authorized_key: user=charlie key=https://github.com/charlie.keys
# Using alternate directory locations:
- authorized_key:
user: charlie
key: "{{ lookup('file', '/home/charlie/.ssh/id_rsa.pub') }}"
path: '/etc/ssh/authorized_keys/charlie'
manage_dir: no
# Using with_file
- name: Set up authorized_keys for the deploy user
authorized_key: user=deploy key="{{ item }}"
with_file:
- public_keys/doe-jane
- public_keys/doe-john
# Using key_options:
- authorized_key:
user: charlie
key: "{{ lookup('file', '/home/charlie/.ssh/id_rsa.pub') }}"
key_options: 'no-port-forwarding,from="10.0.1.1"'
# Using validate_certs:
- authorized_key: user=charlie key=https://github.com/user.keys validate_certs=no
# Set up authorized_keys exclusively with one key
- authorized_key: user=root key="{{ item }}" state=present exclusive=yes
with_file:
- public_keys/doe-jane
# Copies the key from the user who is running ansible to the remote machine user ubuntu
- authorized_key: user=ubuntu key="{{ lookup('file', lookup('env','HOME') + '/.ssh/id_rsa.pub') }}"
become: yes
'''
# Makes sure the public key line is present or absent in the user's .ssh/authorized_keys.
#
# Arguments
# =========
# user = username
# key = line to add to authorized_keys for user
# path = path to the user's authorized_keys file (default: ~/.ssh/authorized_keys)
# manage_dir = whether to create, and control ownership of the directory (default: true)
# state = absent|present (default: present)
#
# see example in examples/playbooks
import sys
import os
import pwd
import os.path
import tempfile
import re
import shlex
class keydict(dict):
""" a dictionary that maintains the order of keys as they are added """
# http://stackoverflow.com/questions/2328235/pythonextend-the-dict-class
def __init__(self, *args, **kw):
super(keydict,self).__init__(*args, **kw)
self.itemlist = super(keydict,self).keys()
def __setitem__(self, key, value):
self.itemlist.append(key)
super(keydict,self).__setitem__(key, value)
def __iter__(self):
return iter(self.itemlist)
def keys(self):
return list(set(self.itemlist))
def values(self):
return [self[key] for key in self]
def itervalues(self):
return (self[key] for key in self)
def keyfile(module, user, write=False, path=None, manage_dir=True):
"""
Calculate name of authorized keys file, optionally creating the
directories and file, properly setting permissions.
:param str user: name of user in passwd file
:param bool write: if True, write changes to authorized_keys file (creating directories if needed)
:param str path: if not None, use provided path rather than default of '~user/.ssh/authorized_keys'
:param bool manage_dir: if True, create and set ownership of the parent dir of the authorized_keys file
:return: full path string to authorized_keys for user
"""
if module.check_mode and path is not None:
keysfile = path
return keysfile
try:
user_entry = pwd.getpwnam(user)
except KeyError:
e = get_exception()
if module.check_mode and path is None:
module.fail_json(msg="Either user must exist or you must provide full path to key file in check mode")
module.fail_json(msg="Failed to lookup user %s: %s" % (user, str(e)))
if path is None:
homedir = user_entry.pw_dir
sshdir = os.path.join(homedir, ".ssh")
keysfile = os.path.join(sshdir, "authorized_keys")
else:
sshdir = os.path.dirname(path)
keysfile = path
if not write:
return keysfile
uid = user_entry.pw_uid
gid = user_entry.pw_gid
if manage_dir:
if not os.path.exists(sshdir):
os.mkdir(sshdir, int('0700', 8))
if module.selinux_enabled():
module.set_default_selinux_context(sshdir, False)
os.chown(sshdir, uid, gid)
os.chmod(sshdir, int('0700', 8))
if not os.path.exists(keysfile):
basedir = os.path.dirname(keysfile)
if not os.path.exists(basedir):
os.makedirs(basedir)
try:
f = open(keysfile, "w") #touches file so we can set ownership and perms
finally:
f.close()
if module.selinux_enabled():
module.set_default_selinux_context(keysfile, False)
try:
os.chown(keysfile, uid, gid)
os.chmod(keysfile, int('0600', 8))
except OSError:
pass
return keysfile
def parseoptions(module, options):
'''
reads a string containing ssh-key options
and returns a dictionary of those options
'''
options_dict = keydict() #ordered dict
if options:
try:
# the following regex will split on commas while
# ignoring those commas that fall within quotes
regex = re.compile(r'''((?:[^,"']|"[^"]*"|'[^']*')+)''')
parts = regex.split(options)[1:-1]
for part in parts:
if "=" in part:
(key, value) = part.split("=", 1)
if options_dict.has_key(key):
if isinstance(options_dict[key], list):
options_dict[key].append(value)
else:
options_dict[key] = [options_dict[key], value]
else:
options_dict[key] = value
elif part != ",":
options_dict[part] = None
except:
module.fail_json(msg="invalid option string: %s" % options)
return options_dict
def parsekey(module, raw_key):
'''
parses a key, which may or may not contain a list
of ssh-key options at the beginning
'''
VALID_SSH2_KEY_TYPES = [
'ssh-ed25519',
'ecdsa-sha2-nistp256',
'ecdsa-sha2-nistp384',
'ecdsa-sha2-nistp521',
'ssh-dss',
'ssh-rsa',
]
options = None # connection options
key = None # encrypted key string
key_type = None # type of ssh key
type_index = None # index of keytype in key string|list
# remove comment yaml escapes
raw_key = raw_key.replace('\#', '#')
# split key safely
lex = shlex.shlex(raw_key)
lex.quotes = []
lex.commenters = '' #keep comment hashes
lex.whitespace_split = True
key_parts = list(lex)
for i in range(0, len(key_parts)):
if key_parts[i] in VALID_SSH2_KEY_TYPES:
type_index = i
key_type = key_parts[i]
break
# check for options
if type_index is None:
return None
elif type_index > 0:
options = " ".join(key_parts[:type_index])
# parse the options (if any)
options = parseoptions(module, options)
# get key after the type index
key = key_parts[(type_index + 1)]
# set comment to everything after the key
if len(key_parts) > (type_index + 1):
comment = " ".join(key_parts[(type_index + 2):])
return (key, key_type, options, comment)
def readkeys(module, filename):
if not os.path.isfile(filename):
return {}
keys = {}
f = open(filename)
for line in f.readlines():
key_data = parsekey(module, line)
if key_data:
# use key as identifier
keys[key_data[0]] = key_data
else:
# for an invalid line, just append the line
# to the array so it will be re-output later
keys[line] = line
f.close()
return keys
def writekeys(module, filename, keys):
fd, tmp_path = tempfile.mkstemp('', 'tmp', os.path.dirname(filename))
f = open(tmp_path,"w")
try:
for index, key in keys.items():
try:
(keyhash,type,options,comment) = key
option_str = ""
if options:
option_strings = []
for option_key in options.keys():
if options[option_key]:
if isinstance(options[option_key], list):
for value in options[option_key]:
option_strings.append("%s=%s" % (option_key, value))
else:
option_strings.append("%s=%s" % (option_key, options[option_key]))
else:
option_strings.append("%s" % option_key)
option_str = ",".join(option_strings)
option_str += " "
key_line = "%s%s %s %s\n" % (option_str, type, keyhash, comment)
except:
key_line = key
f.writelines(key_line)
except IOError:
e = get_exception()
module.fail_json(msg="Failed to write to file %s: %s" % (tmp_path, str(e)))
f.close()
module.atomic_move(tmp_path, filename)
def enforce_state(module, params):
"""
Add or remove key.
"""
user = params["user"]
key = params["key"]
path = params.get("path", None)
manage_dir = params.get("manage_dir", True)
state = params.get("state", "present")
key_options = params.get("key_options", None)
exclusive = params.get("exclusive", False)
validate_certs = params.get("validate_certs", True)
error_msg = "Error getting key from: %s"
# if the key is a url, request it and use it as key source
if key.startswith("http"):
try:
resp, info = fetch_url(module, key)
if info['status'] != 200:
module.fail_json(msg=error_msg % key)
else:
key = resp.read()
except Exception:
module.fail_json(msg=error_msg % key)
# extract individual keys into an array, skipping blank lines and comments
key = [s for s in key.splitlines() if s and not s.startswith('#')]
# check current state -- just get the filename, don't create file
do_write = False
params["keyfile"] = keyfile(module, user, do_write, path, manage_dir)
existing_keys = readkeys(module, params["keyfile"])
# Add a place holder for keys that should exist in the state=present and
# exclusive=true case
keys_to_exist = []
# Check our new keys, if any of them exist we'll continue.
for new_key in key:
parsed_new_key = parsekey(module, new_key)
if not parsed_new_key:
module.fail_json(msg="invalid key specified: %s" % new_key)
if key_options is not None:
parsed_options = parseoptions(module, key_options)
parsed_new_key = (parsed_new_key[0], parsed_new_key[1], parsed_options, parsed_new_key[3])
present = False
matched = False
non_matching_keys = []
if parsed_new_key[0] in existing_keys:
present = True
# Then we check if everything matches, including
# the key type and options. If not, we append this
# existing key to the non-matching list
# We only want it to match everything when the state
# is present
if parsed_new_key != existing_keys[parsed_new_key[0]] and state == "present":
non_matching_keys.append(existing_keys[parsed_new_key[0]])
else:
matched = True
# handle idempotent state=present
if state=="present":
keys_to_exist.append(parsed_new_key[0])
if len(non_matching_keys) > 0:
for non_matching_key in non_matching_keys:
if non_matching_key[0] in existing_keys:
del existing_keys[non_matching_key[0]]
do_write = True
if not matched:
existing_keys[parsed_new_key[0]] = parsed_new_key
do_write = True
elif state=="absent":
if not matched:
continue
del existing_keys[parsed_new_key[0]]
do_write = True
# remove all other keys to honor exclusive
if state == "present" and exclusive:
to_remove = frozenset(existing_keys).difference(keys_to_exist)
for key in to_remove:
del existing_keys[key]
do_write = True
if do_write:
if module.check_mode:
module.exit_json(changed=True)
writekeys(module, keyfile(module, user, do_write, path, manage_dir), existing_keys)
params['changed'] = True
else:
if module.check_mode:
module.exit_json(changed=False)
return params
def main():
module = AnsibleModule(
argument_spec = dict(
user = dict(required=True, type='str'),
key = dict(required=True, type='str'),
path = dict(required=False, type='str'),
manage_dir = dict(required=False, type='bool', default=True),
state = dict(default='present', choices=['absent','present']),
key_options = dict(required=False, type='str'),
unique = dict(default=False, type='bool'),
exclusive = dict(default=False, type='bool'),
validate_certs = dict(default=True, type='bool'),
),
supports_check_mode=True
)
results = enforce_state(module, module.params)
module.exit_json(**results)
# import module snippets
from ansible.module_utils.basic import *
from ansible.module_utils.urls import *
main()
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