summaryrefslogtreecommitdiffstats
path: root/keystone-moon/keystone/common/openssl.py
blob: 0bea6d8e7104c55c9150692e223cc171c1c12b08 (plain)
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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
# Copyright 2012 OpenStack Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#

import os

from oslo_config import cfg
from oslo_log import log

from keystone.common import environment
from keystone.common import utils
from keystone.i18n import _LI, _LE, _LW

LOG = log.getLogger(__name__)
CONF = cfg.CONF

PUBLIC_DIR_PERMS = 0o755        # -rwxr-xr-x
PRIVATE_DIR_PERMS = 0o750       # -rwxr-x---
PUBLIC_FILE_PERMS = 0o644       # -rw-r--r--
PRIVATE_FILE_PERMS = 0o640      # -rw-r-----


def file_exists(file_path):
    return os.path.exists(file_path)


class BaseCertificateConfigure(object):
    """Create a certificate signing environment.

    This is based on a config section and reasonable OpenSSL defaults.

    """

    def __init__(self, conf_obj, server_conf_obj, keystone_user,
                 keystone_group, rebuild, **kwargs):
        self.conf_dir = os.path.dirname(server_conf_obj.ca_certs)
        self.use_keystone_user = keystone_user
        self.use_keystone_group = keystone_group
        self.rebuild = rebuild
        self.ssl_config_file_name = os.path.join(self.conf_dir, "openssl.conf")
        self.request_file_name = os.path.join(self.conf_dir, "req.pem")
        self.ssl_dictionary = {'conf_dir': self.conf_dir,
                               'ca_cert': server_conf_obj.ca_certs,
                               'default_md': 'default',
                               'ssl_config': self.ssl_config_file_name,
                               'ca_private_key': conf_obj.ca_key,
                               'request_file': self.request_file_name,
                               'signing_key': server_conf_obj.keyfile,
                               'signing_cert': server_conf_obj.certfile,
                               'key_size': int(conf_obj.key_size),
                               'valid_days': int(conf_obj.valid_days),
                               'cert_subject': conf_obj.cert_subject}

        try:
            # OpenSSL 1.0 and newer support default_md = default,
            # older versions do not
            openssl_ver = environment.subprocess.check_output(  # the arguments
                # are hardcoded and just check the openssl version
                ['openssl', 'version'])
            if b'OpenSSL 0.' in openssl_ver:
                self.ssl_dictionary['default_md'] = 'sha1'
        except environment.subprocess.CalledProcessError:
            LOG.warning(_LW('Failed to invoke ``openssl version``, '
                            'assuming is v1.0 or newer'))
        self.ssl_dictionary.update(kwargs)

    def exec_command(self, command):
        to_exec = [part % self.ssl_dictionary for part in command]
        LOG.info(_LI('Running command - %s'), ' '.join(to_exec))
        try:
            # NOTE(shaleh): use check_output instead of the simpler
            # `check_call()` in order to log any output from an error.
            environment.subprocess.check_output(  # the arguments being passed
                # in are defined in this file and trusted to build CAs, keys
                # and certs
                to_exec,
                stderr=environment.subprocess.STDOUT)
        except environment.subprocess.CalledProcessError as e:
            LOG.error(_LE('Command %(to_exec)s exited with %(retcode)s '
                          '- %(output)s'),
                      {'to_exec': to_exec,
                       'retcode': e.returncode,
                       'output': e.output})
            raise e

    def clean_up_existing_files(self):
        files_to_clean = [self.ssl_dictionary['ca_private_key'],
                          self.ssl_dictionary['ca_cert'],
                          self.ssl_dictionary['signing_key'],
                          self.ssl_dictionary['signing_cert'],
                          ]

        existing_files = []

        for file_path in files_to_clean:
            if file_exists(file_path):
                if self.rebuild:
                    # The file exists but the user wants to rebuild it, so blow
                    # it away
                    try:
                        os.remove(file_path)
                    except OSError as exc:
                        LOG.error(_LE('Failed to remove file %(file_path)r: '
                                      '%(error)s'),
                                  {'file_path': file_path,
                                   'error': exc.strerror})
                        raise
                else:
                    existing_files.append(file_path)

        return existing_files

    def build_ssl_config_file(self):
        utils.make_dirs(os.path.dirname(self.ssl_config_file_name),
                        mode=PUBLIC_DIR_PERMS,
                        user=self.use_keystone_user,
                        group=self.use_keystone_group, log=LOG)
        if not file_exists(self.ssl_config_file_name):
            with open(self.ssl_config_file_name, 'w') as ssl_config_file:
                ssl_config_file.write(self.sslconfig % self.ssl_dictionary)
        utils.set_permissions(self.ssl_config_file_name,
                              mode=PRIVATE_FILE_PERMS,
                              user=self.use_keystone_user,
                              group=self.use_keystone_group, log=LOG)

        index_file_name = os.path.join(self.conf_dir, 'index.txt')
        if not file_exists(index_file_name):
            with open(index_file_name, 'w') as index_file:
                index_file.write('')
        utils.set_permissions(index_file_name,
                              mode=PRIVATE_FILE_PERMS,
                              user=self.use_keystone_user,
                              group=self.use_keystone_group, log=LOG)

        serial_file_name = os.path.join(self.conf_dir, 'serial')
        if not file_exists(serial_file_name):
            with open(serial_file_name, 'w') as index_file:
                index_file.write('01')
        utils.set_permissions(serial_file_name,
                              mode=PRIVATE_FILE_PERMS,
                              user=self.use_keystone_user,
                              group=self.use_keystone_group, log=LOG)

    def build_ca_cert(self):
        ca_key_file = self.ssl_dictionary['ca_private_key']
        utils.make_dirs(os.path.dirname(ca_key_file),
                        mode=PRIVATE_DIR_PERMS,
                        user=self.use_keystone_user,
                        group=self.use_keystone_group, log=LOG)
        if not file_exists(ca_key_file):
            self.exec_command(['openssl', 'genrsa',
                               '-out', '%(ca_private_key)s',
                               '%(key_size)d'])
        utils.set_permissions(ca_key_file,
                              mode=PRIVATE_FILE_PERMS,
                              user=self.use_keystone_user,
                              group=self.use_keystone_group, log=LOG)

        ca_cert = self.ssl_dictionary['ca_cert']
        utils.make_dirs(os.path.dirname(ca_cert),
                        mode=PUBLIC_DIR_PERMS,
                        user=self.use_keystone_user,
                        group=self.use_keystone_group, log=LOG)
        if not file_exists(ca_cert):
            self.exec_command(['openssl', 'req', '-new', '-x509',
                               '-extensions', 'v3_ca',
                               '-key', '%(ca_private_key)s',
                               '-out', '%(ca_cert)s',
                               '-days', '%(valid_days)d',
                               '-config', '%(ssl_config)s',
                               '-subj', '%(cert_subject)s'])
        utils.set_permissions(ca_cert,
                              mode=PUBLIC_FILE_PERMS,
                              user=self.use_keystone_user,
                              group=self.use_keystone_group, log=LOG)

    def build_private_key(self):
        signing_keyfile = self.ssl_dictionary['signing_key']
        utils.make_dirs(os.path.dirname(signing_keyfile),
                        mode=PRIVATE_DIR_PERMS,
                        user=self.use_keystone_user,
                        group=self.use_keystone_group, log=LOG)
        if not file_exists(signing_keyfile):
            self.exec_command(['openssl', 'genrsa', '-out', '%(signing_key)s',
                               '%(key_size)d'])
        utils.set_permissions(signing_keyfile,
                              mode=PRIVATE_FILE_PERMS,
                              user=self.use_keystone_user,
                              group=self.use_keystone_group, log=LOG)

    def build_signing_cert(self):
        signing_cert = self.ssl_dictionary['signing_cert']

        utils.make_dirs(os.path.dirname(signing_cert),
                        mode=PUBLIC_DIR_PERMS,
                        user=self.use_keystone_user,
                        group=self.use_keystone_group, log=LOG)
        if not file_exists(signing_cert):
            self.exec_command(['openssl', 'req', '-key', '%(signing_key)s',
                               '-new', '-out', '%(request_file)s',
                               '-config', '%(ssl_config)s',
                               '-subj', '%(cert_subject)s'])

            self.exec_command(['openssl', 'ca', '-batch',
                               '-out', '%(signing_cert)s',
                               '-config', '%(ssl_config)s',
                               '-days', '%(valid_days)dd',
                               '-cert', '%(ca_cert)s',
                               '-keyfile', '%(ca_private_key)s',
                               '-infiles', '%(request_file)s'])

    def run(self):
        try:
            existing_files = self.clean_up_existing_files()
        except OSError:
            print('An error occurred when rebuilding cert files.')
            return
        if existing_files:
            print('The following cert files already exist, use --rebuild to '
                  'remove the existing files before regenerating:')
            for f in existing_files:
                print('%s already exists' % f)
            return

        self.build_ssl_config_file()
        self.build_ca_cert()
        self.build_private_key()
        self.build_signing_cert()


class ConfigurePKI(BaseCertificateConfigure):
    """Generate files for PKI signing using OpenSSL.

    Signed tokens require a private key and signing certificate which itself
    must be signed by a CA.  This class generates them with workable defaults
    if each of the files are not present

    """

    def __init__(self, keystone_user, keystone_group, rebuild=False):
        super(ConfigurePKI, self).__init__(CONF.signing, CONF.signing,
                                           keystone_user, keystone_group,
                                           rebuild=rebuild)


class ConfigureSSL(BaseCertificateConfigure):
    """Generate files for HTTPS using OpenSSL.

    Creates a public/private key and certificates. If a CA is not given
    one will be generated using provided arguments.
    """

    def __init__(self, keystone_user, keystone_group, rebuild=False):
        super(ConfigureSSL, self).__init__(CONF.ssl, CONF.eventlet_server_ssl,
                                           keystone_user, keystone_group,
                                           rebuild=rebuild)


BaseCertificateConfigure.sslconfig = """
# OpenSSL configuration file.
#

# Establish working directory.

dir            = %(conf_dir)s

[ ca ]
default_ca        = CA_default

[ CA_default ]
new_certs_dir     = $dir
serial            = $dir/serial
database          = $dir/index.txt
default_days      = 365
default_md        = %(default_md)s
preserve          = no
email_in_dn       = no
nameopt           = default_ca
certopt           = default_ca
policy            = policy_anything
x509_extensions   = usr_cert
unique_subject    = no

[ policy_anything ]
countryName             = optional
stateOrProvinceName     = optional
organizationName        = optional
organizationalUnitName  = optional
commonName              = supplied
emailAddress            = optional

[ req ]
default_bits       = 2048 # Size of keys
default_keyfile    = key.pem # name of generated keys
string_mask        = utf8only # permitted characters
distinguished_name = req_distinguished_name
req_extensions     = v3_req
x509_extensions = v3_ca

[ req_distinguished_name ]
countryName                 = Country Name (2 letter code)
countryName_min             = 2
countryName_max             = 2
stateOrProvinceName         = State or Province Name (full name)
localityName                = Locality Name (city, district)
0.organizationName          = Organization Name (company)
organizationalUnitName      = Organizational Unit Name (department, division)
commonName                  = Common Name (hostname, IP, or your name)
commonName_max              = 64
emailAddress                = Email Address
emailAddress_max            = 64

[ v3_ca ]
basicConstraints       = CA:TRUE
subjectKeyIdentifier   = hash
authorityKeyIdentifier = keyid:always,issuer

[ v3_req ]
basicConstraints     = CA:FALSE
keyUsage = nonRepudiation, digitalSignature, keyEncipherment

[ usr_cert ]
basicConstraints       = CA:FALSE
subjectKeyIdentifier   = hash
authorityKeyIdentifier = keyid:always
"""