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#!/usr/bin/python
# FIXME: Perms checked and okayed on all csr, certs and keys, everywhere
# FIXME: picky about bogus CN names ../ ../ ./ etc, etc to avoid stupid attacks
# 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
#from func.server import codes
import func
import func.certs
import func.codes
import func.utils
class SimpleConfigFile(object):
"""simple config file object:
reads in key=value pairs from a file and stores each as an attribute"""
def __init__(self, filename, defaults={}):
self.fn = filename
fo = open(filename, 'r')
for line in fo.readlines():
if line.startswith('#'): continue
if line.strip() == '': continue
(key, val) = line.split('=')
key = key.strip().lower()
val = val.strip()
setattr(self, key, val)
for k,v in defaults.items():
if not hasattr(self, k):
setattr(self, k, v)
fo.close()
class CertMaster(object):
def __init__(self, conf_file, defaults={}):
self.cfg = SimpleConfigFile(conf_file, defaults)
if hasattr(self.cfg, 'autosign'):
if getattr(self.cfg, 'autosign').lower() in ['yes', 'true', 1, 'on']:
self.cfg.autosign = True
elif getattr(self.cfg, 'autosign').lower() in ['no', 'false', 0, 'off']:
self.cfg.autosign = False
else:
self.cfg.autosign = False
self.cfg.listen_port = int(self.cfg.listen_port)
self.ca_key_file = '%s/funcmaster.key' % self.cfg.cadir
self.ca_cert_file = '%s/funcmaster.crt' % self.cfg.cadir
try:
if not os.path.exists(self.cfg.cadir):
os.makedirs(self.cfg.cadir)
# fixme - should we creating these separately?
if not os.path.exists(self.ca_key_file) and not os.path.exists(self.ca_cert_file):
func.certs.create_ca(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 = func.certs.retrieve_key_from_file(self.ca_key_file)
self.cacert = func.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 func.codes.InvalidMethodException
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 = csrreq.get_subject().CN
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 = func.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 = func.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 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:
print 'Bad CSR: %s' % csr
else: # assume we got a bare csr req
csrreq = csr
requesting_host = csrreq.get_subject().CN
certfile = '%s/%s.cert' % (self.cfg.certroot, requesting_host)
thiscert = func.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, xmlrpcinstance.cfg.listen_port))
server.logRequests = 0 # don't print stuff to console
server.register_instance(xmlrpcinstance)
server.serve_forever()
def main(argv):
defaults = { 'listen_addr': 'localhost',
'listen_port': '51235',
'cadir': '/etc/pki/func/ca',
'certroot': '/var/lib/func/certmaster/certs',
'csrroot': '/var/lib/func/certmaster/csrs',
'autosign': 'false'
}
cm = CertMaster('/etc/func/certmaster.conf', defaults)
if "daemon" in argv or "--daemon" in argv:
func.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)
|
