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import Bcfg2.Server.Plugin
import Bcfg2.Options
import os
from ConfigParser import ConfigParser, NoSectionError, NoOptionError
from M2Crypto import RSA, EVP, X509, m2
"""
How this should work....
V1.0 - Only handles localhost.key and localhost.crt, therefor
assuming we only care about a cert for www, or all ssl services
will use the same cert
Initialiazation:
Grab options from bcfg2.conf
load cakey, cacert
cache other options
Req comes in for key & cert
If key exists:
load key
cache key
return key
Else:
gen key
cache key
save key
return key
If cert exists:
load cert
If fails to verify against key:
gen cert
save cert
return cert
If aliases fail don't match
gen cert
save cert
return cert
return cert
Else:
gen cert
save cert
return cert
V2.0 - Maybe create additional types, SSLCertPath, SSLKeyPath,
to allow generation of multiple certs/keys in arbitrary locations
"""
class SSLbase(Bcfg2.Server.Plugin.Plugin,
Bcfg2.Server.Plugin.Generator,
Bcfg2.Server.Plugin.DirectoryBacked):
"""
The sslca generator manages ssl certificates
and keys
"""
name = 'SSLbase'
__version__ = '0.00000000001'
__author__ = 'ghagger@wgen.net'
hostkey = 'localhost.key'
hostcert = 'localhost.crt'
def __init__(self, core, datastore):
Bcfg2.Server.Plugin.Plugin.__init__(self, core, datastore)
Bcfg2.Server.Plugin.Generator.__init__(self)
try:
Bcfg2.Server.Plugin.DirectoryBacked.__init__(self, self.data,
self.core.fam)
except OSError, ioerr:
self.logger.error("Failed to load SSLbase repository from %s" \
% (self.data))
self.logger.error(ioerr)
raise Bcfg2.Server.Plugin.PluginInitError
self.Entries = {'Path':
{'/etc/pki/tls/private/localhost.key': self.get_key,
'/etc/pki/tls/certs/localhost.crt': self.get_cert}}
# grab essential sslca configuration from bcfg2.conf
cp = ConfigParser()
cp.read(Bcfg2.Options.CFILE.value)
try:
ca_cert_filename = cp.get('sslca', 'ca_cert')
ca_key_filename = cp.get('sslca', 'ca_key')
self.ca_key_passphrase = cp.get('sslca', 'ca_key_passphrase')
self.cert_subject = cp.get('sslca', 'cert_subject')
self.cert_days = cp.get('sslca', 'cert_days')
self.pkey_bits = cp.get('sslca', 'pkey_bits')
except:
raise NoOptionError
self.ca_cert = X509.load_cert(ca_cert_filename)
self.ca_key = EVP.load_key(ca_key_filename, lambda x: self.ca_key_passphrase)
self._newkey = False
def get_key(self, entry, metadata):
filename = self.hostkey+".H_%s" % metadata.hostname
if filename in self.entries.keys():
entry.text = self.entries[filename].data
self.pkey = EVP.load_key_string(entry.text)
else:
(self.pkey, entry.text) = self.build_key(filename)
keyfile = open(self.data + '/' +filename, 'w')
keyfile.write(entry.text)
keyfile.close()
self._newkey = True
def build_key(self, filename):
"""Generate new private key for client."""
rsa_key = RSA.gen_key(int(self.pkey_bits), m2.RSA_F4)
pkey = EVP.PKey()
pkey.assign_rsa(rsa_key)
keyfile = open(self.data + '/' +filename, 'w')
keyfile.write(pkey.as_pem(cipher=None))
keyfile.close()
self._newkey = True
return pkey, pkey.as_pem(cipher=None)
def get_cert(self, entry, metadata):
filename = self.hostcert + ".H_%s" % metadata.hostname
# load prexisting cert, if any
if filename in self.entries.keys() and self._newkey == False:
cert = X509.load_cert_string(self.entries[filename].data)
# check cert subjectAltNames match current aliases
cert_aliases = cert.get_ext('subjectAltName')
if cert_aliases:
if metadata.aliases != [alias.lstrip('DNS:') for alias in cert_aliases.get_value().split(', ')]:
entry.text = self.build_cert(filename, metadata)
return
entry.text = cert.as_text()+cert.as_string()
else:
entry.text = self.build_cert(filename, metadata)
def get_serial(self):
serialpath = self.data + '/serial'
serial = 0
if os.path.isfile(serialpath):
serialfile = open(serialpath, 'r')
serial = int(serialfile.read())
serialfile.close()
serialfile = open(serialpath, 'w')
serial += 1
serialfile.write(str(serial))
serialfile.close()
return serial
def build_cert(self, filename, metadata):
req = self.make_request(self.pkey, metadata)
serial = self.get_serial()
cert = self.make_cert(req, serial, metadata.aliases)
cert_out = cert.as_text()+cert.as_pem()
certfile = open(self.data + '/' +filename, 'w')
certfile.write(cert_out)
certfile.close()
cert_store = self.data + '/certstore'
if not os.path.isdir(cert_store):
os.mkdir(cert_store)
storefile = open(cert_store + '/' + str(serial) + '.pem', 'w')
storefile.write(cert_out)
storefile.close()
return cert_out
def make_request(self, key, metadata):
req = X509.Request()
req.set_version(2)
req.set_pubkey(key)
name = X509.X509_Name()
parts = [a.split('=') for a in self.cert_subject.split(',')]
[setattr(name, k, v) for k,v in parts]
name.CN = metadata.hostname
req.set_subject_name(name)
req.sign(key, 'sha1')
return req
def make_cert(self, req, serial, aliases):
pkey = req.get_pubkey()
if not req.verify(pkey):
raise ValueError, 'Error verifying request'
sub = req.get_subject()
cert = X509.X509()
cert.set_serial_number(serial)
cert.set_version(2)
cert.set_subject(sub)
cert.set_issuer(self.ca_cert)
cert.set_pubkey(pkey)
notBefore = m2.x509_get_not_before(cert.x509)
notAfter = m2.x509_get_not_after(cert.x509)
m2.x509_gmtime_adj(notBefore, 0)
m2.x509_gmtime_adj(notAfter, 60*60*24*long(self.cert_days))
exts = [
('basicConstraints','CA:FALSE'),
('subjectKeyIdentifier','hash'),
('authorityKeyIdentifier','keyid,issuer:always'),
('nsCertType','SSL Server'),
]
if aliases:
exts.append(('subjectAltName', ','.join(['DNS:'+alias for alias in aliases])))
for ext in exts:
cert.add_ext(X509.new_extension(ext[0],ext[1]))
cert.sign(self.ca_key, 'sha1')
return cert
def HandleEvent(self, event=None):
"""Local event handler that does something...."""
Bcfg2.Server.Plugin.DirectoryBacked.HandleEvent(self, event)
def HandlesEntry(self, entry, _):
"""Handle entries dynamically."""
return entry.tag == 'Path' and (entry.get('name').endswith(self.hostkey) or entry.get('name').endswith(self.hostcert))
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