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import Bcfg2.Server.Plugin
import Bcfg2.Options
import lxml.etree
import posixpath
import tempfile
import pipes
import os
from subprocess import Popen, PIPE, STDOUT
# Compatibility import
from Bcfg2.Bcfg2Py3k 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 __init__(self, core, datastore):
Bcfg2.Server.Plugin.GroupSpool.__init__(self, core, datastore)
self.infoxml = dict()
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 = os.path.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,
parser=Bcfg2.Server.XMLParser).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,
parser=Bcfg2.Server.XMLParser).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.ConfigParser()
cp.read(self.core.cfile)
self.CAs[ca] = dict(cp.items('sslca_' + ca))
self.Entries['Path'][ident] = self.get_cert
elif event.filename.endswith("info.xml"):
self.infoxml[ident] = Bcfg2.Server.Plugin.InfoXML(epath,
noprio=True)
self.infoxml[ident].HandleEvent(event)
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.
"""
# 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 = os.path.join(path, "%s.H_%s" % (os.path.basename(path),
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__(self.data + filename)
self.entries[filename].HandleEvent()
else:
entry.text = self.entries[filename].data
entry.set("type", "file")
if path in self.infoxml:
Bcfg2.Server.Plugin.bind_info(entry, metadata,
infoxml=self.infoxml[path])
else:
Bcfg2.Server.Plugin.bind_info(entry, metadata)
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", bits]
elif type == 'dsa':
cmd = ["openssl", "dsaparam", "-noout", "-genkey", bits]
key = Popen(cmd, 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.
"""
path = entry.get('name')
filename = os.path.join(path, "%s.H_%s" % (os.path.basename(path),
metadata.hostname))
# first - ensure we have a key to work with
key = self.cert_specs[entry.get('name')].get('key')
key_filename = os.path.join(key, "%s.H_%s" % (os.path.basename(key),
metadata.hostname))
if key_filename not in self.entries:
e = lxml.etree.Element('Path')
e.set('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__(self.data + filename)
self.entries[filename].HandleEvent()
entry.text = cert
entry.set("type", "file")
if path in self.infoxml:
Bcfg2.Server.Plugin.bind_info(entry, metadata,
infoxml=self.infoxml[path])
else:
Bcfg2.Server.Plugin.bind_info(entry, metadata)
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
res = Popen(["openssl", "verify", "-CAfile", chaincert, cert],
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" %
pipes.quote(cert))
cert_md5 = Popen(cmd, shell=True, stdout=PIPE, stderr=STDOUT).stdout.read()
cmd = ("openssl rsa -noout -modulus -in %s | openssl md5" %
pipes.quote(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')
cmd = ["openssl", "ca", "-config", ca_config, "-in", req,
"-days", days, "-batch"]
if passphrase:
cmd.extend(["-passin", "pass:%s" % passphrase])
cert = Popen(cmd, 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.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", req_config,
"-days", days, "-key", key, "-text", "-out", req]
res = Popen(cmd, stdout=PIPE).stdout.read()
return req
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