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# FIXME: more intelligent fault raises
"""
cert master listener
Copyright 2007, Red Hat, Inc
see AUTHORS
This software may be freely redistributed under the terms of the GNU
general public license.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
"""
# standard modules
import SimpleXMLRPCServer
import sys
import os
import os.path
from OpenSSL import crypto
import sha
import glob
import socket
import exceptions
import certs
import codes
import utils
from config import read_config
from commonconfig import CMConfig
CERTMASTER_LISTEN_PORT = 51235
CERTMASTER_CONFIG = "/etc/certmaster/certmaster.conf"
class CertMaster(object):
def __init__(self, conf_file=CERTMASTER_CONFIG):
self.cfg = read_config(conf_file, CMConfig)
usename = utils.get_hostname(talk_to_certmaster=False)
mycn = '%s-CA-KEY' % usename
self.ca_key_file = '%s/certmaster.key' % self.cfg.cadir
self.ca_cert_file = '%s/certmaster.crt' % self.cfg.cadir
try:
if not os.path.exists(self.cfg.cadir):
os.makedirs(self.cfg.cadir)
if not os.path.exists(self.ca_key_file) and not os.path.exists(self.ca_cert_file):
certs.create_ca(CN=mycn, ca_key_file=self.ca_key_file, ca_cert_file=self.ca_cert_file)
except (IOError, OSError), e:
print 'Cannot make certmaster certificate authority keys/certs, aborting: %s' % e
sys.exit(1)
# open up the cakey and cacert so we have them available
self.cakey = certs.retrieve_key_from_file(self.ca_key_file)
self.cacert = certs.retrieve_cert_from_file(self.ca_cert_file)
for dirpath in [self.cfg.cadir, self.cfg.certroot, self.cfg.csrroot]:
if not os.path.exists(dirpath):
os.makedirs(dirpath)
# setup handlers
self.handlers = {
'wait_for_cert': self.wait_for_cert,
}
def _dispatch(self, method, params):
if method == 'trait_names' or method == '_getAttributeNames':
return self.handlers.keys()
if method in self.handlers.keys():
return self.handlers[method](*params)
else:
raise codes.InvalidMethodException
def _sanitize_cn(self, commonname):
commonname = commonname.replace('/', '')
commonname = commonname.replace('\\', '')
return commonname
def wait_for_cert(self, csrbuf):
"""
takes csr as a string
returns True, caller_cert, ca_cert
returns False, '', ''
"""
try:
csrreq = crypto.load_certificate_request(crypto.FILETYPE_PEM, csrbuf)
except crypto.Error, e:
#XXX need to raise a fault here and document it - but false is just as good
return False, '', ''
requesting_host = self._sanitize_cn(csrreq.get_subject().CN)
# get rid of dodgy characters in the filename we're about to make
certfile = '%s/%s.cert' % (self.cfg.certroot, requesting_host)
csrfile = '%s/%s.csr' % (self.cfg.csrroot, requesting_host)
# check for old csr on disk
# if we have it - compare the two - if they are not the same - raise a fault
if os.path.exists(csrfile):
oldfo = open(csrfile)
oldcsrbuf = oldfo.read()
oldsha = sha.new()
oldsha.update(oldcsrbuf)
olddig = oldsha.hexdigest()
newsha = sha.new()
newsha.update(csrbuf)
newdig = newsha.hexdigest()
if not newdig == olddig:
# XXX raise a proper fault
return False, '', ''
# look for a cert:
# if we have it, then return True, etc, etc
if os.path.exists(certfile):
slavecert = certs.retrieve_cert_from_file(certfile)
cert_buf = crypto.dump_certificate(crypto.FILETYPE_PEM, slavecert)
cacert_buf = crypto.dump_certificate(crypto.FILETYPE_PEM, self.cacert)
return True, cert_buf, cacert_buf
# if we don't have a cert then:
# if we're autosign then sign it, write out the cert and return True, etc, etc
# else write out the csr
if self.cfg.autosign:
cert_fn = self.sign_this_csr(csrreq)
cert = certs.retrieve_cert_from_file(cert_fn)
cert_buf = crypto.dump_certificate(crypto.FILETYPE_PEM, cert)
cacert_buf = crypto.dump_certificate(crypto.FILETYPE_PEM, self.cacert)
return True, cert_buf, cacert_buf
else:
# write the csr out to a file to be dealt with by the admin
destfo = open(csrfile, 'w')
destfo.write(crypto.dump_certificate_request(crypto.FILETYPE_PEM, csrreq))
destfo.close()
del destfo
return False, '', ''
return False, '', ''
def get_csrs_waiting(self):
hosts = []
csrglob = '%s/*.csr' % self.cfg.csrroot
csr_list = glob.glob(csrglob)
for f in csr_list:
hn = os.path.basename(f)
hn = hn[:-4]
hosts.append(hn)
return hosts
def remove_this_cert(self, hn):
""" removes cert for hostname using unlink """
cm = self
csrglob = '%s/%s.csr' % (cm.cfg.csrroot, hn)
csrs = glob.glob(csrglob)
certglob = '%s/%s.cert' % (cm.cfg.certroot, hn)
certs = glob.glob(certglob)
if not csrs and not certs:
# FIXME: should be an exception?
print 'No match for %s to clean up' % hn
return
for fn in csrs + certs:
print 'Cleaning out %s for host matching %s' % (fn, hn)
os.unlink(fn)
def sign_this_csr(self, csr):
"""returns the path to the signed cert file"""
csr_unlink_file = None
if type(csr) is type(''):
if csr.startswith('/') and os.path.exists(csr): # we have a full path to the file
csrfo = open(csr)
csr_buf = csrfo.read()
csr_unlink_file = csr
elif os.path.exists('%s/%s' % (self.cfg.csrroot, csr)): # we have a partial path?
csrfo = open('%s/%s' % (self.cfg.csrroot, csr))
csr_buf = csrfo.read()
csr_unlink_file = '%s/%s' % (self.cfg.csrroot, csr)
# we have a string of some kind
else:
csr_buf = csr
try:
csrreq = crypto.load_certificate_request(crypto.FILETYPE_PEM, csr_buf)
except crypto.Error, e:
raise exceptions.Exception("Bad CSR: %s" % csr)
else: # assume we got a bare csr req
csrreq = csr
requesting_host = self._sanitize_cn(csrreq.get_subject().CN)
certfile = '%s/%s.cert' % (self.cfg.certroot, requesting_host)
thiscert = certs.create_slave_certificate(csrreq, self.cakey, self.cacert, self.cfg.cadir)
destfo = open(certfile, 'w')
destfo.write(crypto.dump_certificate(crypto.FILETYPE_PEM, thiscert))
destfo.close()
del destfo
if csr_unlink_file and os.path.exists(csr_unlink_file):
os.unlink(csr_unlink_file)
return certfile
class CertmasterXMLRPCServer(SimpleXMLRPCServer.SimpleXMLRPCServer):
def __init__(self, args):
self.allow_reuse_address = True
SimpleXMLRPCServer.SimpleXMLRPCServer.__init__(self, args)
def serve(xmlrpcinstance):
"""
Code for starting the XMLRPC service.
"""
server = CertmasterXMLRPCServer((xmlrpcinstance.cfg.listen_addr, CERTMASTER_LISTEN_PORT))
server.logRequests = 0 # don't print stuff to console
server.register_instance(xmlrpcinstance)
server.serve_forever()
def main(argv):
cm = CertMaster('/etc/certmaster/certmaster.conf')
if "daemon" in argv or "--daemon" in argv:
utils.daemonize("/var/run/certmaster.pid")
else:
print "serving...\n"
# just let exceptions bubble up for now
serve(cm)
if __name__ == "__main__":
#textdomain(I18N_DOMAIN)
main(sys.argv)
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