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import logging
import os
from os.path import join as path_join
from os.path import exists
import subprocess
log = logging.getLogger("service_ca")
logging.basicConfig(level=logging.DEBUG)
STD_CERT = "standard"
# Mysql server is fairly picky about cert creation
# and types, spec its creation separately for now.
MYSQL_CERT = "mysql"
class ServiceCA(object):
default_expiry = str(365 * 2)
default_ca_expiry = str(365 * 6)
def __init__(self, name, ca_dir, cert_type=STD_CERT):
self.name = name
self.ca_dir = ca_dir
self.cert_type = cert_type
###############
# Hook Helper API
@staticmethod
def get_ca(type=STD_CERT):
service_name = os.environ['JUJU_UNIT_NAME'].split('/')[0]
ca_path = os.path.join(os.environ['CHARM_DIR'], 'ca')
ca = ServiceCA(service_name, ca_path, type)
ca.init()
return ca
@classmethod
def get_service_cert(cls, type=STD_CERT):
service_name = os.environ['JUJU_UNIT_NAME'].split('/')[0]
ca = cls.get_ca()
crt, key = ca.get_or_create_cert(service_name)
return crt, key, ca.get_ca_bundle()
###############
def init(self):
log.debug("initializing service ca")
if not exists(self.ca_dir):
self._init_ca_dir(self.ca_dir)
self._init_ca()
@property
def ca_key(self):
return path_join(self.ca_dir, 'private', 'cacert.key')
@property
def ca_cert(self):
return path_join(self.ca_dir, 'cacert.pem')
@property
def ca_conf(self):
return path_join(self.ca_dir, 'ca.cnf')
@property
def signing_conf(self):
return path_join(self.ca_dir, 'signing.cnf')
def _init_ca_dir(self, ca_dir):
os.mkdir(ca_dir)
for i in ['certs', 'crl', 'newcerts', 'private']:
sd = path_join(ca_dir, i)
if not exists(sd):
os.mkdir(sd)
if not exists(path_join(ca_dir, 'serial')):
with open(path_join(ca_dir, 'serial'), 'wb') as fh:
fh.write('02\n')
if not exists(path_join(ca_dir, 'index.txt')):
with open(path_join(ca_dir, 'index.txt'), 'wb') as fh:
fh.write('')
def _init_ca(self):
"""Generate the root ca's cert and key.
"""
if not exists(path_join(self.ca_dir, 'ca.cnf')):
with open(path_join(self.ca_dir, 'ca.cnf'), 'wb') as fh:
fh.write(
CA_CONF_TEMPLATE % (self.get_conf_variables()))
if not exists(path_join(self.ca_dir, 'signing.cnf')):
with open(path_join(self.ca_dir, 'signing.cnf'), 'wb') as fh:
fh.write(
SIGNING_CONF_TEMPLATE % (self.get_conf_variables()))
if exists(self.ca_cert) or exists(self.ca_key):
raise RuntimeError("Initialized called when CA already exists")
cmd = ['openssl', 'req', '-config', self.ca_conf,
'-x509', '-nodes', '-newkey', 'rsa',
'-days', self.default_ca_expiry,
'-keyout', self.ca_key, '-out', self.ca_cert,
'-outform', 'PEM']
output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
log.debug("CA Init:\n %s", output)
def get_conf_variables(self):
return dict(
org_name="juju",
org_unit_name="%s service" % self.name,
common_name=self.name,
ca_dir=self.ca_dir)
def get_or_create_cert(self, common_name):
if common_name in self:
return self.get_certificate(common_name)
return self.create_certificate(common_name)
def create_certificate(self, common_name):
if common_name in self:
return self.get_certificate(common_name)
key_p = path_join(self.ca_dir, "certs", "%s.key" % common_name)
crt_p = path_join(self.ca_dir, "certs", "%s.crt" % common_name)
csr_p = path_join(self.ca_dir, "certs", "%s.csr" % common_name)
self._create_certificate(common_name, key_p, csr_p, crt_p)
return self.get_certificate(common_name)
def get_certificate(self, common_name):
if not common_name in self:
raise ValueError("No certificate for %s" % common_name)
key_p = path_join(self.ca_dir, "certs", "%s.key" % common_name)
crt_p = path_join(self.ca_dir, "certs", "%s.crt" % common_name)
with open(crt_p) as fh:
crt = fh.read()
with open(key_p) as fh:
key = fh.read()
return crt, key
def __contains__(self, common_name):
crt_p = path_join(self.ca_dir, "certs", "%s.crt" % common_name)
return exists(crt_p)
def _create_certificate(self, common_name, key_p, csr_p, crt_p):
template_vars = self.get_conf_variables()
template_vars['common_name'] = common_name
subj = '/O=%(org_name)s/OU=%(org_unit_name)s/CN=%(common_name)s' % (
template_vars)
log.debug("CA Create Cert %s", common_name)
cmd = ['openssl', 'req', '-sha1', '-newkey', 'rsa:2048',
'-nodes', '-days', self.default_expiry,
'-keyout', key_p, '-out', csr_p, '-subj', subj]
subprocess.check_call(cmd)
cmd = ['openssl', 'rsa', '-in', key_p, '-out', key_p]
subprocess.check_call(cmd)
log.debug("CA Sign Cert %s", common_name)
if self.cert_type == MYSQL_CERT:
cmd = ['openssl', 'x509', '-req',
'-in', csr_p, '-days', self.default_expiry,
'-CA', self.ca_cert, '-CAkey', self.ca_key,
'-set_serial', '01', '-out', crt_p]
else:
cmd = ['openssl', 'ca', '-config', self.signing_conf,
'-extensions', 'req_extensions',
'-days', self.default_expiry, '-notext',
'-in', csr_p, '-out', crt_p, '-subj', subj, '-batch']
log.debug("running %s", " ".join(cmd))
subprocess.check_call(cmd)
def get_ca_bundle(self):
with open(self.ca_cert) as fh:
return fh.read()
CA_CONF_TEMPLATE = """
[ ca ]
default_ca = CA_default
[ CA_default ]
dir = %(ca_dir)s
policy = policy_match
database = $dir/index.txt
serial = $dir/serial
certs = $dir/certs
crl_dir = $dir/crl
new_certs_dir = $dir/newcerts
certificate = $dir/cacert.pem
private_key = $dir/private/cacert.key
RANDFILE = $dir/private/.rand
default_md = default
[ req ]
default_bits = 1024
default_md = sha1
prompt = no
distinguished_name = ca_distinguished_name
x509_extensions = ca_extensions
[ ca_distinguished_name ]
organizationName = %(org_name)s
organizationalUnitName = %(org_unit_name)s Certificate Authority
[ policy_match ]
countryName = optional
stateOrProvinceName = optional
organizationName = match
organizationalUnitName = optional
commonName = supplied
[ ca_extensions ]
basicConstraints = critical,CA:true
subjectKeyIdentifier = hash
authorityKeyIdentifier = keyid:always, issuer
keyUsage = cRLSign, keyCertSign
"""
SIGNING_CONF_TEMPLATE = """
[ ca ]
default_ca = CA_default
[ CA_default ]
dir = %(ca_dir)s
policy = policy_match
database = $dir/index.txt
serial = $dir/serial
certs = $dir/certs
crl_dir = $dir/crl
new_certs_dir = $dir/newcerts
certificate = $dir/cacert.pem
private_key = $dir/private/cacert.key
RANDFILE = $dir/private/.rand
default_md = default
[ req ]
default_bits = 1024
default_md = sha1
prompt = no
distinguished_name = req_distinguished_name
x509_extensions = req_extensions
[ req_distinguished_name ]
organizationName = %(org_name)s
organizationalUnitName = %(org_unit_name)s machine resources
commonName = %(common_name)s
[ policy_match ]
countryName = optional
stateOrProvinceName = optional
organizationName = match
organizationalUnitName = optional
commonName = supplied
[ req_extensions ]
basicConstraints = CA:false
subjectKeyIdentifier = hash
authorityKeyIdentifier = keyid:always, issuer
keyUsage = digitalSignature, keyEncipherment, keyAgreement
extendedKeyUsage = serverAuth, clientAuth
"""
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