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ipaclient_join.py 11.52 KiB
#!/usr/bin/python
# -*- coding: utf-8 -*-
# Authors:
# Thomas Woerner <twoerner@redhat.com>
#
# Based on ipa-client-install code
#
# Copyright (C) 2017 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/>.
ANSIBLE_METADATA = {
'metadata_version': '1.0',
'supported_by': 'community',
'status': ['preview'],
}
DOCUMENTATION = '''
---
module: ipaclient_join
short description:
Join a machine to an IPA realm and get a keytab for the host service
principal
description:
Join a machine to an IPA realm and get a keytab for the host service
principal
options:
servers:
description: Fully qualified name of IPA servers to enroll to
required: no
domain:
description: Primary DNS domain of the IPA deployment
required: no
realm:
description: Kerberos realm name of the IPA deployment
required: no
hostname:
description: Fully qualified name of this host
required: no
kdc:
description: The name or address of the host running the KDC
required: no
basedn:
description: The basedn of the IPA server (of the form dc=example,dc=com)
required: no
principal:
description:
User Principal allowed to promote replicas and join IPA realm
required: yes
password:
description: Admin user kerberos password
required: yes
keytab:
description: Path to backed up keytab from previous enrollment
required: yes
admin_keytab:
description: The path to a local admin keytab
required: yes
ca_cert_file:
description:
A CA certificate to use. Do not acquire the IPA CA certificate via
automated means
required: yes
force_join:
description: Force client enrollment even if already enrolled
required: yes
kinit_attempts:
description: Repeat the request for host Kerberos ticket X times
required: yes
debug:
description: Turn on extra debugging
required: yes
author:
- Thomas Woerner
'''
EXAMPLES = '''
# Join IPA to get the keytab
- name: Join IPA in force mode with maximum 5 kinit attempts
ipaclient_join:
servers: ["server1.example.com","server2.example.com"]
domain: example.com
realm: EXAMPLE.COM
kdc: server1.example.com
basedn: dc=example,dc=com
hostname: client1.example.com
principal: admin
password: MySecretPassword
force_join: yes
kinit_attempts: 5
# Join IPA to get the keytab using ipadiscovery return values
- name: Join IPA
ipaclient_join:
servers: "{{ ipadiscovery.servers }}"
domain: "{{ ipadiscovery.domain }}"
realm: "{{ ipadiscovery.realm }}"
kdc: "{{ ipadiscovery.kdc }}"
basedn: "{{ ipadiscovery.basedn }}"
hostname: "{{ ipadiscovery.hostname }}"
principal: admin
password: MySecretPassword
'''
RETURN = '''
already_joined:
description: The flag describes if the host is arelady joined.
returned: always
type: bool
'''
import os
import tempfile
from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.ansible_ipa_client import (
SECURE_PATH, sysrestore, paths, options, configure_krb5_conf,
realm_to_suffix, kinit_keytab, GSSError, kinit_password, NUM_VERSION,
get_ca_cert, get_ca_certs, errors, run
)
def main():
module = AnsibleModule(
argument_spec=dict(
servers=dict(required=True, type='list'),
domain=dict(required=True),
realm=dict(required=True),
hostname=dict(required=True),
kdc=dict(required=True),
basedn=dict(required=True),
principal=dict(required=False),
password=dict(required=False, no_log=True),
keytab=dict(required=False),
admin_keytab=dict(required=False),
ca_cert_file=dict(required=False),
force_join=dict(required=False, type='bool'),
kinit_attempts=dict(required=False, type='int', default=5),
debug=dict(required=False, type='bool'),
),
supports_check_mode=True,
)
module._ansible_debug = True
servers = module.params.get('servers')
domain = module.params.get('domain')
realm = module.params.get('realm')
hostname = module.params.get('hostname')
basedn = module.params.get('basedn')
kdc = module.params.get('kdc')
force_join = module.params.get('force_join')
principal = module.params.get('principal')
password = module.params.get('password')
keytab = module.params.get('keytab')
admin_keytab = module.params.get('admin_keytab')
ca_cert_file = module.params.get('ca_cert_file')
kinit_attempts = module.params.get('kinit_attempts')
debug = module.params.get('debug')
if password is not None and keytab is not None:
module.fail_json(msg="Password and keytab cannot be used together")
if password is None and admin_keytab is None:
module.fail_json(msg="Password or admin_keytab is needed")
client_domain = hostname[hostname.find(".")+1:]
nolog = tuple()
env = {'PATH': SECURE_PATH}
fstore = sysrestore.FileStore(paths.IPA_CLIENT_SYSRESTORE)
host_principal = 'host/%s@%s' % (hostname, realm)
sssd = True
options.ca_cert_file = ca_cert_file
options.principal = principal
options.force = False
options.password = password
ccache_dir = None
changed = False
already_joined = False
try:
(krb_fd, krb_name) = tempfile.mkstemp()
os.close(krb_fd)
configure_krb5_conf(
cli_realm=realm,
cli_domain=domain,
cli_server=servers,
cli_kdc=kdc,
dnsok=False,
filename=krb_name,
client_domain=client_domain,
client_hostname=hostname,
configure_sssd=sssd,
force=False)
env['KRB5_CONFIG'] = krb_name
ccache_dir = tempfile.mkdtemp(prefix='krbcc')
ccache_name = os.path.join(ccache_dir, 'ccache')
join_args = [paths.SBIN_IPA_JOIN,
"-s", servers[0],
"-b", str(realm_to_suffix(realm)),
"-h", hostname]
if debug:
join_args.append("-d")
env['XMLRPC_TRACE_CURL'] = 'yes'
if force_join:
join_args.append("-f")
if principal is not None:
if principal.find('@') == -1:
principal = '%s@%s' % (principal, realm)
if admin_keytab:
join_args.append("-f")
if not os.path.exists(admin_keytab):
module.fail_json(
msg="Keytab file could not be found: %s" %
admin_keytab)
try:
kinit_keytab(principal,
admin_keytab,
ccache_name,
config=krb_name,
attempts=kinit_attempts)
except GSSError as e:
module.fail_json(
msg="Kerberos authentication failed: %s" % str(e))
else:
try:
kinit_password(principal, password, ccache_name,
config=krb_name)
except RuntimeError as e:
module.fail_json(
msg="Kerberos authentication failed: {}".format(e))
elif keytab:
join_args.append("-f")
if os.path.exists(keytab):
try:
kinit_keytab(host_principal,
keytab,
ccache_name,
config=krb_name,
attempts=kinit_attempts)
except GSSError as e:
module.fail_json(
msg="Kerberos authentication failed: {}".format(e))
else:
module.fail_json(
msg="Keytab file could not be found: {}".format(keytab))
elif password:
join_args.append("-w")
join_args.append(password)
nolog = (password,)
env['KRB5CCNAME'] = os.environ['KRB5CCNAME'] = ccache_name
# Get the CA certificate
try:
os.environ['KRB5_CONFIG'] = env['KRB5_CONFIG']
if NUM_VERSION < 40100:
get_ca_cert(fstore, options, servers[0], basedn)
else:
get_ca_certs(fstore, options, servers[0], basedn, realm)
del os.environ['KRB5_CONFIG']
except errors.FileError as e:
module.fail_json(msg='%s' % e)
except Exception as e:
module.fail_json(msg="Cannot obtain CA certificate\n%s" % e)
# Now join the domain
result = run(
join_args, raiseonerr=False, env=env, nolog=nolog,
capture_error=True)
stderr = result.error_output
if result.returncode != 0:
if result.returncode == 13:
already_joined = True
module.log("Host is already joined")
else:
if principal:
run([paths.KDESTROY], raiseonerr=False, env=env)
module.fail_json(msg="Joining realm failed: %s" % stderr)
else:
changed = True
module.log("Enrolled in IPA realm %s" % realm)
# Fail for missing krb5.keytab on already joined host
if already_joined and not os.path.exists(paths.KRB5_KEYTAB):
module.fail_json(msg="krb5.keytab missing! Retry with "
"ipaclient_force_join=yes to generate a new one.")
if principal:
run([paths.KDESTROY], raiseonerr=False, env=env)
# Obtain the TGT. We do it with the temporary krb5.conf, sot
# tha only the KDC we're installing under is contacted.
# Other KDCs might not have replicated the principal yet.
# Once we have the TGT, it's usable on any server.
try:
kinit_keytab(host_principal, paths.KRB5_KEYTAB,
paths.IPA_DNS_CCACHE,
config=krb_name,
attempts=kinit_attempts)
env['KRB5CCNAME'] = os.environ['KRB5CCNAME'] = paths.IPA_DNS_CCACHE
except GSSError as e:
# failure to get ticket makes it impossible to login and
# bind from sssd to LDAP, abort installation
module.fail_json(msg="Failed to obtain host TGT: %s" % e)
finally:
try:
os.remove(krb_name)
except OSError:
module.fail_json(msg="Could not remove %s" % krb_name)
if ccache_dir is not None:
try:
os.rmdir(ccache_dir)
except OSError:
pass
if os.path.exists(krb_name + ".ipabkp"):
try:
os.remove(krb_name + ".ipabkp")
except OSError:
module.fail_json(msg="Could not remove %s.ipabkp" % krb_name)
module.exit_json(changed=changed,
already_joined=already_joined)
if __name__ == '__main__':
main()