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#!/usr/bin/python -tt
##
# Copyright (C) 2012 by Konstantin Ryabitsev and contributors
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# 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., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
#
import os
import re
import sys
import cgi
import syslog
import logging
import urllib2
import cgitb
cgitb.enable()
import totpcgi
import totpcgi.backends
if len(sys.argv) > 1:
# blindly assume it's the config file
config_file = sys.argv[1]
else:
config_file = '/etc/totpcgi/totpcgi.conf'
import ConfigParser
from fedora.client import AuthError
from fedora.client.fasproxy import FasProxyClient
config = ConfigParser.RawConfigParser()
config.read(config_file)
require_pincode = config.getboolean('main', 'require_pincode')
success_string = config.get('main', 'success_string')
fas_url = config.get('main', 'fas_url')
try:
fas = FasProxyClient(fas_url)
except Exception, e:
syslog.syslog(syslog.LOG_CRIT, 'Problem connecting to fas %s' % e)
sys.exit(1)
backends = totpcgi.backends.Backends()
try:
backends.load_from_config(config)
except totpcgi.backends.BackendNotSupported, ex:
syslog.syslog(syslog.LOG_CRIT,
'Backend engine not supported: %s' % ex)
sys.exit(1)
syslog.openlog('totp.cgi', syslog.LOG_PID, syslog.LOG_AUTH)
### Begin custom Fedora Functions
def google_auth_fas_pincode_verify(user, pincode):
if not fas.verify_password(user, pincode):
raise totpcgi.UserPincodeError('User Password Error')
backends.pincode_backend.verify_user_pincode = google_auth_fas_pincode_verify
client_id = '1'
def parse_token(token):
if token > 44:
otp = token[-44:]
if otp.startswith('ccccc'):
return token[:-44], otp
# Not a password + yubikey
return False
class YubikeyAuthenticator(object):
auth_regex = re.compile('^status=(?P<rc>\w{2})')
def __init__(self, require_pincode=False):
self.require_pincode = require_pincode
def verify_user_token(self, user, token):
# Parse the token apart into a password and token
password, otp = parse_token(token)
# Verify token against yubikey server
server_prefix = 'http://localhost/yk-val/verify?id='
server_url = server_prefix + client_id + "&otp=" + otp
fh = urllib2.urlopen(server_url)
for line in fh:
match = self.auth_regex.search(line.strip('\n'))
if match:
if match.group('rc') == 'OK':
# Yubikey token is valid
break
raise totpcgi.VerifyFailed(line.split('=')[1])
else:
raise totpcgi.VerifyFailed('yk-val returned malformed response')
# Verify that the yubikey token belongs to the user
# As a side effect, verify the password is good as well
# if the user+password are wrong, this will raise a fedora.client.AuthError
try:
response = fas.send_request('/config/list/%s/yubikey' % user,
auth_params={'username': user, 'password': password})
except AuthError, e:
raise totpcgi.VerifyFailed('User Password Error: %s' % e)
if not response[1].configs.prefix or not response[1].configs.enabled:
raise totpcgi.VerifyFailed('Yubikey OTP unconfigured')
elif len(response[1].configs.prefix) != 12:
raise totpcgi.VerifyFailed('Invalid Yubikey OTP prefix')
if not otp.startswith(response[1].configs.prefix):
raise totpcgi.VerifyFailed('Unauthorized/Invalid OTP')
# Okay, everything passed
return 'Valid yubikey returned'
### End of custom Fedora Functions
def bad_request(why):
output = 'ERR\n' + why + '\n'
sys.stdout.write('Status: 400 BAD REQUEST\n')
sys.stdout.write('Content-type: text/plain\n')
sys.stdout.write('Content-Length: %s\n' % len(output))
sys.stdout.write('\n')
sys.stdout.write(output)
sys.exit(0)
def cgimain():
form = cgi.FieldStorage()
must_keys = ('user', 'token', 'mode')
for must_key in must_keys:
if must_key not in form:
bad_request("Missing field: %s" % must_key)
user = form.getfirst('user')
token = form.getfirst('token')
mode = form.getfirst('mode')
remote_host = os.environ['REMOTE_ADDR']
if mode != 'PAM_SM_AUTH':
bad_request('We only support PAM_SM_AUTH')
if parse_token(token):
ga = YubikeyAuthenticator(require_pincode)
else:
# totp/googleauth
ga = totpcgi.GoogleAuthenticator(backends, require_pincode)
try:
status = ga.verify_user_token(user, token)
except Exception, ex:
syslog.syslog(syslog.LOG_NOTICE,
'Failure: user=%s, mode=%s, host=%s, message=%s' % (user, mode,
remote_host, str(ex)))
bad_request(str(ex))
syslog.syslog(syslog.LOG_NOTICE,
'Success: user=%s, mode=%s, host=%s, message=%s' % (user, mode,
remote_host, status))
sys.stdout.write('Status: 200 OK\n')
sys.stdout.write('Content-type: text/plain\n')
sys.stdout.write('Content-Length: %s\n' % len(success_string))
sys.stdout.write('\n')
sys.stdout.write(success_string)
if __name__ == '__main__':
cgimain()
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