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##########################################################################
#
# Copyright (c) 2005 Imaginary Landscape LLC and Contributors.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
##########################################################################
import time as time_mod
import md5
import cgi
import Cookie
class AuthTicket(object):
"""
This class represents an authentication token. You must pass in
the shared secret, the userid, and the IP address. Optionally you
can include tokens (a list of strings, representing role names),
'user_data', which is arbitrary data available for your own use in
later scripts. Lastly, you can override the cookie name and
timestamp.
Once you provide all the arguments, use .cookie_value() to
generate the appropriate authentication ticket. .cookie()
generates a Cookie object, the str() of which is the complete
cookie header to be sent.
CGI usage::
token = auth_ticket.AuthTicket('sharedsecret', 'username',
os.environ['REMOTE_ADDR'], tokens=['admin'])
print 'Status: 200 OK'
print 'Content-type: text/html'
print token.cookie()
print
... redirect HTML ...
Webware usage::
token = auth_ticket.AuthTicket('sharedsecret', 'username',
self.request().environ()['REMOTE_ADDR'], tokens=['admin'])
self.response().setCookie('auth_tkt', token.cookie_value())
Be careful not to do an HTTP redirect after login; use meta
refresh or Javascript -- some browsers have bugs where cookies
aren't saved when set on a redirect.
"""
def __init__(self, secret, userid, ip, tokens=(), user_data='',
time=None, cookie_name='auth_tkt',
secure=False):
self.secret = secret
self.userid = userid
self.ip = ip
self.tokens = ','.join(tokens)
self.user_data = user_data
if time is None:
self.time = time_mod.time()
else:
self.time = time
self.cookie_name = cookie_name
self.secure = secure
def ipts(self):
ip_chars = ''.join(map(chr, map(int, self.ip.split('.'))))
t = int(self.time)
ts = ((t & 0xff000000) >> 24,
(t & 0xff0000) >> 16,
(t & 0xff00) >> 8,
t & 0xff)
ts_chars = ''.join(map(chr, ts))
return ip_chars + ts_chars
def digest0(self):
return md5.new(
self.ipts() + self.secret
+ self.userid + '\0' + self.tokens
+ '\0' + self.user_data).hexdigest()
def digest(self):
return md5.new(self.digest0() + self.secret).hexdigest()
def cookie_value(self):
v = '%s%08x%s!' % (self.digest(), int(self.time), self.userid)
if self.tokens:
v += self.tokens + '!'
v += self.user_data
return v
def cookie(self):
c = Cookie.SimpleCookie()
c[self.cookie_name] = self.cookie_value().encode('base64').strip()
c[self.cookie_name]['path'] = '/'
if self.secure:
c[self.cookie_name]['secure'] = 'true'
return c
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