summaryrefslogtreecommitdiffstats
path: root/ipaserver/plugins/ra.py
blob: 1238f5036452c86b946e2b5574750c9e86b00911 (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
338
339
340
341
342
343
# Authors:
#   Andrew Wnuk <awnuk@redhat.com>
#   Jason Gerard DeRose <jderose@redhat.com>
#   Rob Crittenden <rcritten@@redhat.com>
#
# Copyright (C) 2009  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; version 2 only
#
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

"""
Backend plugin for IPA-RA.

The `ra` plugin provides access to the CA to issue, retrieve, and revoke
certificates via the following methods:

    * `ra.check_request_status()` - check certificate request status.
    * `ra.get_certificate()` - retrieve an existing certificate.
    * `ra.request_certificate()` - request a new certificate.
    * `ra.revoke_certificate()` - revoke a certificate.
    * `ra.take_certificate_off_hold()` - take a certificate off hold.
"""

from ipalib import api, SkipPluginModule
if api.env.enable_ra is not True:
    # In this case, abort loading this plugin module...
    raise SkipPluginModule(reason='env.enable_ra is not True')
import os, stat, subprocess
import array
import errno
import binascii
from httplib import HTTPConnection
from urllib import urlencode, quote
from socket import gethostname
import socket
from ipalib import Backend
from ipalib.errors import NetworkError
from ipaserver import servercore
from ipaserver import ipaldap
from ipalib.constants import TYPE_ERROR
from ipapython import nsslib
import nss.nss as nss
import nss.ssl as ssl
from nss.error import NSPRError
import xml.dom.minidom

def get_xml_value(doc, tagname):
    try:
        item_node = doc.getElementsByTagName(tagname)
        return item_node[0].childNodes[0].data
    except IndexError:
        return None

class ra(Backend):
    """
    Request Authority backend plugin.
    """
    def __init__(self):
        if api.env.home:
            self.sec_dir = api.env.dot_ipa + os.sep + 'alias'
            self.pwd_file = self.sec_dir + os.sep + '.pwd'
        else:
            self.sec_dir = "/etc/httpd/alias"
            self.pwd_file = "/etc/httpd/alias/pwdfile.txt"
        self.noise_file = self.sec_dir + os.sep + '.noise'
        self.ipa_key_size = "2048"
        self.ipa_certificate_nickname = "ipaCert"
        self.ca_certificate_nickname = "caCert"
        f = open(self.pwd_file, "r")
        self.password = f.readline().strip()
        f.close()
        super(ra, self).__init__()

    def _request(self, url, **kw):
        """
        Perform an HTTP request.

        :param url: The URL to post to.
        :param kw: Keyword arguments to encode into POST body.
        """
        uri = 'http://%s:%s%s' % (self.env.ca_host, self.env.ca_port, url)
        post = urlencode(kw)
        self.info('request %r', uri)
        self.debug('request post %r', post)
        conn = HTTPConnection(self.env.ca_host, self.env.ca_port)
        try:
            conn.request('POST', url,
                body=post,
                headers={'Content-type': 'application/x-www-form-urlencoded'},
            )
        except socket.error, e:
            raise NetworkError(uri=uri, error=e.args[1])
        response = conn.getresponse()
        (status, reason) = (response.status, response.reason)
        data = response.read()
        conn.close()
        self.debug('request status %r', status)
        self.debug('request reason %s', reason)
        self.debug('request data %s', data)
        return (status, reason, data)

    def _sslget(self, url, **kw):
        """
        Perform an HTTPS request

        :param url: The URL to post to.
        :param kw: Keyword arguments to encode into POST body.
        """
        uri = 'https://%s:%d%s' % (self.env.ca_host, self.env.ca_ssl_port, url)
        post = urlencode(kw)
        self.info('sslget %r', uri)
        self.debug('sslget post %r', post)
        argv = [
            '/usr/bin/sslget',
            '-n', self.ipa_certificate_nickname,  # nickname
            '-w', self.pwd_file,  # pwfile
            '-d', self.sec_dir,  # dbdir
            '-e', post,  # post
            '-r', url,  # url
            '%s:%d' % (self.env.ca_host, self.env.ca_ssl_port),
        ]
        headers = {"Content-type": "application/x-www-form-urlencoded",
                   "Accept": "text/plain"}
        conn = nsslib.NSSConnection(self.env.ca_host, self.env.ca_ssl_port, dbdir=self.sec_dir)
        conn.sslsock.set_client_auth_data_callback(nsslib.client_auth_data_callback, self.ipa_certificate_nickname, self.password, nss.get_default_certdb())
        conn.set_debuglevel(10)
        conn.request("POST", url, post, headers)
        res = conn.getresponse()
        (status, reason) = (res.status, res.reason)
        data = res.read()
        conn.close()

        self.debug('sslget status %r', status)
        self.debug('sslget reason %s', reason)
        self.debug('sslget output %s', data)
        return (status, reason, data)

    def check_request_status(self, request_id):
        """
        Check status of a certificate signing request.

        :param request_id: request ID
        """
        self.debug('%s.check_request_status()', self.fullname)
        (s, r, data) = self._request('/ca/ee/ca/checkRequest',
            requestId=request_id,
            xmlOutput='true',
        )
        response = {'status': '2'}
        if data is not None:
            request_status = self.__find_substring(
                data, 'header.status = "', '"'
            )
            if request_status is not None:
                response['status'] = '0'
                response['request_status'] = request_status
                serial_number = self.__find_substring(
                    data, 'record.serialNumber="', '"'
                )
                if serial_number is not None:
                    # This was "0x"+serial_number, but we should return it in
                    # the same form used as arg to get_certificate(), etc.
                    response['serial_number'] = serial_number
            request_id = self.__find_substring(
                data, 'header.requestId = "', '"'
            )
            if request_id is not None:
                response['request_id'] = request_id
            error = self.__find_substring(
                data, 'fixed.unexpectedError = "', '"'
            )
            if error is not None:
                response['error'] = error
        return response

    def get_certificate(self, serial_number=None):
        """
        Retrieve an existing certificate.

        :param serial_number: certificate serial number
        """
        self.debug('%s.get_certificate()', self.fullname)
        issued_certificate = None
        (status, reason, stdout) = self._sslget(
            '/ca/agent/ca/displayBySerial',
            serialNumber=serial_number,
            xmlOutput='true',
        )
        response = {}
        if (status == 200):
            issued_certificate = self.__find_substring(
                stdout, 'header.certChainBase64 = "', '"'
            )
            if issued_certificate is not None:
                response['status'] = '0'
                issued_certificate = issued_certificate.replace('\\r', '')
                issued_certificate = issued_certificate.replace('\\n', '')
                self.debug('IPA-RA: issued_certificate: %s', issued_certificate)
                response['certificate'] = issued_certificate
            else:
                response['status'] = '1'
            revocation_reason = self.__find_substring(
                stdout, 'header.revocationReason = ', ';'
            )
            if revocation_reason is not None:
                response['revocation_reason'] = revocation_reason
        else:
            response['status'] = str(status)
        return response

    def request_certificate(self, csr, request_type='pkcs10'):
        """
        Submit certificate signing request.

        :param csr: The certificate signing request.
        :param request_type: The request type (defaults to ``'pkcs10'``).
        """
        self.debug('%s.request_certificate()', self.fullname)
        certificate = None
        (status, reason, stdout) = self._sslget('/ca/ee/ca/profileSubmit',
            profileId='caRAserverCert',
            cert_request_type=request_type,
            cert_request=csr,
            xmlOutput='true',
        )
        response = {}
        if (status == 200):
            doc = xml.dom.minidom.parseString(stdout)

            status = get_xml_value(doc, "Status")
            if status is not None:
                response["status"] = status
            request_id = get_xml_value(doc, "Id")
            if request_id is not None:
                response["request_id"] = request_id
            serial_number = get_xml_value(doc, "serialno")
            if serial_number is not None:
                response["serial_number"] = ("0x%s" % serial_number)
            subject = get_xml_value(doc, "SubjectDN")
            if subject is not None:
                response["subject"] = subject
            certificate = get_xml_value(doc, "b64")
            if certificate is not None:
                response["certificate"] = certificate
            if response.has_key("status") is False:
                response["status"] = "2"

            doc.unlink()
        else:
            response["status"] = str(status)
        return response

    def revoke_certificate(self, serial_number, revocation_reason=0):
        """
        Revoke a certificate.

        The integer ``revocation_reason`` code must have one of these values:

            * ``0`` - unspecified
            * ``1`` - keyCompromise
            * ``2`` - cACompromise
            * ``3`` - affiliationChanged
            * ``4`` - superseded
            * ``5`` - cessationOfOperation
            * ``6`` - certificateHold
            * ``8`` - removeFromCRL
            * ``9`` - privilegeWithdrawn
            * ``10`` - aACompromise

        Note that reason code ``7`` is not used.  See RFC 5280 for more details:

            http://www.ietf.org/rfc/rfc5280.txt

        :param serial_number: Certificate serial number.
        :param revocation_reason: Integer code of revocation reason.
        """
        self.debug('%s.revoke_certificate()', self.fullname)
        if type(revocation_reason) is not int:
            raise TYPE_ERROR('revocation_reason', int, revocation_reason,
                type(revocation_reason)
            )
        response = {}
        (status, reason, stdout) = self._sslget('/ca/agent/ca/doRevoke',
            op='revoke',
            revocationReason=revocation_reason,
            revokeAll='(certRecordId=%s)' % serial_number,
            totalRecordCount=1,
        )
        if status == 200:
            response['status'] = '0'
            if (stdout.find('revoked = "yes"') > -1):
                response['revoked'] = True
            else:
                response['revoked'] = False
        else:
            response['status'] = str(status)
        return response

    def take_certificate_off_hold(self, serial_number):
        """
        Take revoked certificate off hold.

        :param serial_number: Certificate serial number.
        """
        response = {}
        self.debug('%s.take_certificate_off_hold()', self.fullname)
        (status, reason, stdout) = self._sslget('/ca/agent/ca/doUnrevoke',
            serialNumber=serial_number,
        )
        if (status == 0):
            if (stdout.find('unrevoked = "yes"') > -1):
                response['taken_off_hold'] = True
            else:
                response['taken_off_hold'] = False
        else:
            response['status'] = str(status)
        return response

    def __find_substring(self, str, str1, str2):
        sub_str = None
        k0 = len(str)
        k1 = str.find(str1)
        k2 = len(str1)
        if (k0 > 0 and k1 > -1 and k2 > 0 and k0 > k1 + k2):
            sub_str = str[k1+k2:]
            k3 = len(sub_str)
            k4 = sub_str.find(str2)
            if (k3 > 0 and k4 > -1 and k3 > k4):
                sub_str = sub_str[:k4]
        return sub_str

api.register(ra)