1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
# Copyright (C) 2014 Simo Sorce <simo@redhat.com>
#
# 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/>.
import logging
import pwd
import os
import socket
import subprocess
import sys
from ipsilon.helpers.common import EnvHelpersInstaller
IPA_CONFIG_FILE = '/etc/ipa/default.conf'
HTTPD_IPA_KEYTAB = '/etc/httpd/conf/ipa.keytab'
IPA_COMMAND = '/usr/bin/ipa'
IPA_GETKEYTAB = '/usr/sbin/ipa-getkeytab'
HTTPD_USER = 'apache'
NO_CREDS_FOR_KEYTAB = """
Valid IPA admin credentials are required to get a keytab.
Please kinit with a pivileged user like 'admin' and retry.
"""
FAILED_TO_GET_KEYTAB = """
A pre-existing keytab was not found and it was not possible to
successfully retrieve a new keytab for the IPA server. Please
manually provide a keytab or resolve the error that cause this
failure (see logs) and retry.
"""
class Installer(EnvHelpersInstaller):
def __init__(self, *pargs):
super(Installer, self).__init__()
self.name = 'ipa'
self.ptype = 'helper'
self.logger = None
self.realm = None
self.domain = None
self.server = None
def install_args(self, group):
group.add_argument('--ipa', choices=['yes', 'no', 'auto'],
default='auto',
help='Helper for IPA joined machines')
def conf_init(self, opts):
logger = self.logger
# Do a simple check to see if machine is ipa joined
if not os.path.exists(IPA_CONFIG_FILE):
logger.info('No IPA configuration file. Skipping ipa helper...')
if opts['ipa'] == 'yes':
raise Exception('No IPA installation found!')
return
# Get config vars from ipa file
try:
from ipapython import config as ipaconfig
ipaconfig.init_config()
self.realm = ipaconfig.config.get_realm()
self.domain = ipaconfig.config.get_domain()
self.server = ipaconfig.config.get_server()
except Exception, e: # pylint: disable=broad-except
logger.info('IPA tools installation found: [%s]', e)
if opts['ipa'] == 'yes':
raise Exception('No IPA installation found!')
return
def get_keytab(self, opts):
logger = self.logger
# Check if we have need ipa tools
if not os.path.exists(IPA_GETKEYTAB):
logger.info('ipa-getkeytab missing. Will skip keytab creation.')
if opts['ipa'] == 'yes':
raise Exception('No IPA tools found!')
# Check if we already have a keytab for HTTP
if 'krb_httpd_keytab' in opts:
msg = "Searching for keytab in: %s" % opts['krb_httpd_keytab']
print >> sys.stdout, msg,
if os.path.exists(opts['krb_httpd_keytab']):
print >> sys.stdout, "... Found!"
return
else:
print >> sys.stdout, "... Not found!"
msg = "Searching for keytab in: %s" % HTTPD_IPA_KEYTAB
print >> sys.stdout, msg,
if os.path.exists(HTTPD_IPA_KEYTAB):
opts['krb_httpd_keytab'] = HTTPD_IPA_KEYTAB
print >> sys.stdout, "... Found!"
return
else:
print >> sys.stdout, "... Not found!"
us = socket.gethostname()
princ = 'HTTP/%s@%s' % (us, self.realm)
# Check we have credentials to access server (for keytab)
from ipalib import api
from ipalib import errors as ipaerrors
api.bootstrap(context='ipsilon_installer')
api.finalize()
try:
api.Backend.rpcclient.connect()
logger.debug('Try RPC connection')
api.Backend.rpcclient.forward('ping')
print >> sys.stdout, "... Succeeded!"
except ipaerrors.KerberosError as e:
print >> sys.stderr, NO_CREDS_FOR_KEYTAB
logger.error('Invalid credentials: [%s]', repr(e))
if api.Backend.rpcclient.isconnected():
api.Backend.rpcclient.disconnect()
raise Exception('Invalid credentials: [%s]' % e)
except ipaerrors.PublicError as e:
print >> sys.stderr, "Can't connect to any IPA server"
logger.error(
'Cannot connect to the server due to generic error: %s', e)
if api.Backend.rpcclient.isconnected():
api.Backend.rpcclient.disconnect()
raise Exception('Unable to connect to IPA server: %s' % e)
# Specify an older version to work on nearly any master. Force is
# set to True so a DNS A record is not required for adding the
# service.
try:
api.Backend.rpcclient.forward(
'service_add',
unicode(princ),
force=True,
version=u'2.0',
)
except ipaerrors.DuplicateEntry:
logger.debug('Principal %s already exists' % princ)
except ipaerrors.NotFound as e:
print >> sys.stderr, "%s" % e
logger.error('%s' % e)
raise Exception('%s' % e)
except ipaerrors.ACIError as e:
print >> sys.stderr, NO_CREDS_FOR_KEYTAB
logger.error('Invalid credentials: [%s]', repr(e))
raise Exception('Invalid credentials: [%s]' % e)
finally:
server = api.Backend.rpcclient.api.env.server
if api.Backend.rpcclient.isconnected():
api.Backend.rpcclient.disconnect()
try:
msg = "Trying to fetch keytab[%s] for %s" % (
opts['krb_httpd_keytab'], princ)
print >> sys.stdout, msg,
subprocess.check_output([IPA_GETKEYTAB,
'-s', server, '-p', princ,
'-k', opts['krb_httpd_keytab']],
stderr=subprocess.STDOUT)
except subprocess.CalledProcessError, e:
# unfortunately this one is fatal
print >> sys.stderr, FAILED_TO_GET_KEYTAB
logger.info('Error trying to get HTTP keytab:')
logger.info('Cmd> %s\n%s', e.cmd, e.output)
raise Exception('Missing keytab: [%s]' % e)
# Fixup permissions so only the ipsilon user can read these files
pw = pwd.getpwnam(HTTPD_USER)
os.chown(opts['krb_httpd_keytab'], pw.pw_uid, pw.pw_gid)
def configure_server(self, opts):
if opts['ipa'] != 'yes' and opts['ipa'] != 'auto':
return
if opts['ipa'] != 'yes' and opts['krb'] == 'no':
return
self.logger = logging.getLogger()
self.conf_init(opts)
self.get_keytab(opts)
# Forcibly use krb then pam modules
if 'lm_order' not in opts:
opts['lm_order'] = []
opts['krb'] = 'yes'
if 'krb' not in opts['lm_order']:
opts['lm_order'].insert(0, 'krb')
opts['form'] = 'yes'
if not any(lm in opts['lm_order'] for lm in ('form', 'pam')):
opts['lm_order'].append('form')
|