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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(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(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 self.entries.keys():
key = self.build_key(filename, entry, metadata)
open(self.data + filename, 'w').write(key)
entry.text = key
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 self.entries.keys() and self.verify_cert(filename, entry):
entry.text = self.entries[filename].data
else:
cert = self.build_cert(key_filename, entry, metadata)
open(self.data + filename, 'w').write(cert)
entry.text = cert
def verify_cert(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 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 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
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