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
|
import Bcfg2.Server.Plugin
import Bcfg2.Options
import lxml.etree
import posixpath
import tempfile
import os
from subprocess import Popen, PIPE, STDOUT
from ConfigParser import ConfigParser
class SSLCA(Bcfg2.Server.Plugin.GroupSpool):
"""
The SSLCA generator handles the creation and
management of ssl certificates and their keys.
"""
name = 'SSLCA'
__version__ = '$Id:$'
__author__ = 'g.hagger@gmail.com'
__child__ = Bcfg2.Server.Plugin.FileBacked
key_specs = {}
cert_specs = {}
CAs = {}
def HandleEvent(self, event=None):
"""
Updates which files this plugin handles based upon filesystem events.
Allows configuration items to be added/removed without server restarts.
"""
action = event.code2str()
if event.filename[0] == '/':
return
epath = "".join([self.data, self.handles[event.requestID],
event.filename])
if posixpath.isdir(epath):
ident = self.handles[event.requestID] + event.filename
else:
ident = self.handles[event.requestID][:-1]
fname = "".join([ident, '/', event.filename])
if event.filename.endswith('.xml'):
if action in ['exists', 'created', 'changed']:
if event.filename.endswith('key.xml'):
key_spec = dict(list(lxml.etree.parse(epath).find('Key').items()))
self.key_specs[ident] = {
'bits': key_spec.get('bits', 2048),
'type': key_spec.get('type', 'rsa')
}
self.Entries['Path'][ident] = self.get_key
elif event.filename.endswith('cert.xml'):
cert_spec = dict(list(lxml.etree.parse(epath).find('Cert').items()))
ca = cert_spec.get('ca', 'default')
self.cert_specs[ident] = {
'ca': ca,
'format': cert_spec.get('format', 'pem'),
'key': cert_spec.get('key'),
'days': cert_spec.get('days', 365),
'C': cert_spec.get('c'),
'L': cert_spec.get('l'),
'ST': cert_spec.get('st'),
'OU': cert_spec.get('ou'),
'O': cert_spec.get('o'),
'emailAddress': cert_spec.get('emailaddress')
}
cp = ConfigParser()
cp.read(self.core.cfile)
self.CAs[ca] = dict(cp.items('sslca_' + ca))
self.Entries['Path'][ident] = self.get_cert
if action == 'deleted':
if ident in self.Entries['Path']:
del self.Entries['Path'][ident]
else:
if action in ['exists', 'created']:
if posixpath.isdir(epath):
self.AddDirectoryMonitor(epath[len(self.data):])
if ident not in self.entries and posixpath.isfile(epath):
self.entries[fname] = self.__child__(epath)
self.entries[fname].HandleEvent(event)
if action == 'changed':
self.entries[fname].HandleEvent(event)
elif action == 'deleted':
if fname in self.entries:
del self.entries[fname]
else:
self.entries[fname].HandleEvent(event)
def get_key(self, entry, metadata):
"""
either grabs a prexisting key hostfile, or triggers the generation
of a new key if one doesn't exist.
"""
# set path type and permissions, otherwise bcfg2 won't bind the file
permdata = {'owner': 'root',
'group': 'root',
'type': 'file',
'perms': '644'}
[entry.attrib.__setitem__(key, permdata[key]) for key in permdata]
# check if we already have a hostfile, or need to generate a new key
# TODO: verify key fits the specs
path = entry.get('name')
filename = "".join([path, '/', path.rsplit('/', 1)[1],
'.H_', metadata.hostname])
if filename not in list(self.entries.keys()):
key = self.build_key(filename, entry, metadata)
open(self.data + filename, 'w').write(key)
entry.text = key
self.entries[filename] = self.__child__("%s%s" % (self.data,
filename))
self.entries[filename].HandleEvent()
else:
entry.text = self.entries[filename].data
def build_key(self, filename, entry, metadata):
"""
generates a new key according the the specification
"""
type = self.key_specs[entry.get('name')]['type']
bits = self.key_specs[entry.get('name')]['bits']
if type == 'rsa':
cmd = "openssl genrsa %s " % bits
elif type == 'dsa':
cmd = "openssl dsaparam -noout -genkey %s" % bits
key = Popen(cmd, shell=True, stdout=PIPE).stdout.read()
return key
def get_cert(self, entry, metadata):
"""
either grabs a prexisting cert hostfile, or triggers the generation
of a new cert if one doesn't exist.
"""
# set path type and permissions, otherwise bcfg2 won't bind the file
permdata = {'owner': 'root',
'group': 'root',
'type': 'file',
'perms': '644'}
[entry.attrib.__setitem__(key, permdata[key]) for key in permdata]
path = entry.get('name')
filename = "".join([path, '/', path.rsplit('/', 1)[1],
'.H_', metadata.hostname])
# first - ensure we have a key to work with
key = self.cert_specs[entry.get('name')].get('key')
key_filename = "".join([key, '/', key.rsplit('/', 1)[1],
'.H_', metadata.hostname])
if key_filename not in self.entries:
e = lxml.etree.Element('Path')
e.attrib['name'] = key
self.core.Bind(e, metadata)
# check if we have a valid hostfile
if filename in list(self.entries.keys()) and self.verify_cert(filename,
key_filename,
entry):
entry.text = self.entries[filename].data
else:
cert = self.build_cert(key_filename, entry, metadata)
open(self.data + filename, 'w').write(cert)
self.entries[filename] = self.__child__("%s%s" % (self.data,
filename))
self.entries[filename].HandleEvent()
entry.text = cert
def verify_cert(self, filename, key_filename, entry):
if self.verify_cert_against_ca(filename, entry):
if self.verify_cert_against_key(filename, key_filename):
return True
return False
def verify_cert_against_ca(self, filename, entry):
"""
check that a certificate validates against the ca cert,
and that it has not expired.
"""
chaincert = self.CAs[self.cert_specs[entry.get('name')]['ca']].get('chaincert')
cert = self.data + filename
cmd = "openssl verify -CAfile %s %s" % (chaincert, cert)
res = Popen(cmd, shell=True, stdout=PIPE, stderr=STDOUT).stdout.read()
if res == cert + ": OK\n":
return True
return False
def verify_cert_against_key(self, filename, key_filename):
"""
check that a certificate validates against its private key.
"""
cert = self.data + filename
key = self.data + key_filename
cmd = "openssl x509 -noout -modulus -in %s | openssl md5" % cert
cert_md5 = Popen(cmd, shell=True, stdout=PIPE, stderr=STDOUT).stdout.read()
cmd = "openssl rsa -noout -modulus -in %s | openssl md5" % key
key_md5 = Popen(cmd, shell=True, stdout=PIPE, stderr=STDOUT).stdout.read()
if cert_md5 == key_md5:
return True
return False
def build_cert(self, key_filename, entry, metadata):
"""
creates a new certificate according to the specification
"""
req_config = self.build_req_config(entry, metadata)
req = self.build_request(key_filename, req_config, entry)
ca = self.cert_specs[entry.get('name')]['ca']
ca_config = self.CAs[ca]['config']
days = self.cert_specs[entry.get('name')]['days']
passphrase = self.CAs[ca].get('passphrase')
if passphrase:
cmd = "openssl ca -config %s -in %s -days %s -batch -passin pass:%s" % (ca_config,
req,
days,
passphrase)
else:
cmd = "openssl ca -config %s -in %s -days %s -batch" % (ca_config,
req,
days)
cert = Popen(cmd, shell=True, stdout=PIPE).stdout.read()
try:
os.unlink(req_config)
os.unlink(req)
except OSError:
self.logger.error("Failed to unlink temporary files")
return cert
def build_req_config(self, entry, metadata):
"""
generates a temporary openssl configuration file that is
used to generate the required certificate request
"""
# create temp request config file
conffile = open(tempfile.mkstemp()[1], 'w')
cp = ConfigParser({})
cp.optionxform = str
defaults = {
'req': {
'default_md': 'sha1',
'distinguished_name': 'req_distinguished_name',
'req_extensions': 'v3_req',
'x509_extensions': 'v3_req',
'prompt': 'no'
},
'req_distinguished_name': {},
'v3_req': {
'subjectAltName': '@alt_names'
},
'alt_names': {}
}
for section in list(defaults.keys()):
cp.add_section(section)
for key in defaults[section]:
cp.set(section, key, defaults[section][key])
x = 1
altnames = list(metadata.aliases)
altnames.append(metadata.hostname)
for altname in altnames:
cp.set('alt_names', 'DNS.' + str(x), altname)
x += 1
for item in ['C', 'L', 'ST', 'O', 'OU', 'emailAddress']:
if self.cert_specs[entry.get('name')][item]:
cp.set('req_distinguished_name', item, self.cert_specs[entry.get('name')][item])
cp.set('req_distinguished_name', 'CN', metadata.hostname)
cp.write(conffile)
conffile.close()
return conffile.name
def build_request(self, key_filename, req_config, entry):
"""
creates the certificate request
"""
req = tempfile.mkstemp()[1]
days = self.cert_specs[entry.get('name')]['days']
key = self.data + key_filename
cmd = "openssl req -new -config %s -days %s -key %s -text -out %s" % (req_config,
days,
key,
req)
res = Popen(cmd, shell=True, stdout=PIPE).stdout.read()
return req
|
