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# Copyright (C) 1998,1999,2000 by the Free Software Foundation, Inc.
#
# 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.
"""Handle passwords and sanitize approved messages."""
import os
import time
import sha
import marshal
import binascii
from types import StringType, TupleType
from urlparse import urlparse
try:
import crypt
except ImportError:
crypt = None
from Mailman import Errors
from Mailman import Utils
from Mailman import Cookie
from Mailman import mm_cfg
class SecurityManager:
def InitVars(self, crypted_password):
# Configurable, however, we don't pass this back in GetConfigInfo
# because it's a special case as it requires confirmation to change.
self.password = crypted_password
# Non configurable
self.passwords = {}
def ValidAdminPassword(self, response):
if Utils.CheckSiteAdminPassword(response):
return 1
# Old passwords may have been encrypted w/crypt. First try comparing
# challenge with sha hashed response and if that fails, use crypt and
# upgrade.
challenge = self.password
sha_response = sha.new(response).hexdigest()
if challenge == sha_response:
return 1
if crypt and challenge == crypt.crypt(response, challenge[:2]):
# Upgrade the password hash to SHA1. BAW: should we store the
# plaintext password as well? We could implement a mail-back
# option for list owners that way.
self.password = sha_response
return 1
# Didn't match.
return 0
def ConfirmAdminPassword(self, pw):
if not self.ValidAdminPassword(pw):
raise Errors.MMBadPasswordError
return 1
def WebAuthenticate(self, user=None, password=None, cookie=None):
key = self.internal_name()
if cookie:
key = key + ':' + cookie
# password will be None for explicit login
if password is not None:
if user:
self.ConfirmUserPassword(user, password)
else:
self.ConfirmAdminPassword(password)
print self.MakeCookie(key)
return 1
else:
return self.CheckCookie(key)
def MakeCookie(self, key):
# Ingredients for our cookie: our `secret' which is the list's admin
# password (never sent in the clear) and the time right now in seconds
# since the epoch.
secret = self.password
issued = int(time.time())
# Get a digest of the secret, plus other information.
mac = sha.new(secret + `issued`).hexdigest()
# Create the cookie object. The way the cookie module converts
# non-strings to pickles can cause problems if the resulting string
# needs to be quoted. So we'll do the conversion ourselves.
c = Cookie.Cookie()
c[key] = binascii.hexlify(marshal.dumps((issued, mac)))
# The path to all Mailman stuff, minus the scheme and host,
# i.e. usually the string `/mailman'
path = urlparse(self.web_page_url)[2]
c[key]['path'] = path
# Should we use session or persistent cookies?
if mm_cfg.ADMIN_COOKIE_LIFE > 0:
c[key]['expires'] = mm_cfg.ADMIN_COOKIE_LIFE
c[key]['max-age'] = mm_cfg.ADMIN_COOKIE_LIFE
# Set the RFC 2109 required header
c[key]['version'] = 1
return c
def ZapCookie(self, cookie=None):
key = self.internal_name()
if cookie:
key = key + ':' + cookie
# Logout of the session by zapping the cookie. For safety both set
# max-age=0 (as per RFC2109) and set the cookie data to the empty
# string.
c = Cookie.Cookie()
c[key] = ''
# The path to all Mailman stuff, minus the scheme and host,
# i.e. usually the string `/mailman'
path = urlparse(self.web_page_url)[2]
c[key]['path'] = path
c[key]['max-age'] = 0
# Don't set expires=0 here otherwise it'll force a persistent cookie
c[key]['version'] = 1
return c
def CheckCookie(self, key):
cookiedata = os.environ.get('HTTP_COOKIE')
if not cookiedata:
return 0
c = Cookie.Cookie(cookiedata)
if not c.has_key(key):
return 0
# Undo the encoding we performed in MakeCookie() above
try:
cookie = marshal.loads(binascii.unhexlify(c[key].value))
issued, received_mac = cookie
except (EOFError, ValueError, TypeError):
raise Errors.MMInvalidCookieError
now = time.time()
if now < issued:
raise Errors.MMInvalidCookieError
secret = self.password
mac = sha.new(secret + `issued`).hexdigest()
if mac <> received_mac:
raise Errors.MMInvalidCookieError
return 1
def ConfirmUserPassword(self, user, pw):
"""True if password is valid for site, list admin, or specific user."""
if self.ValidAdminPassword(pw):
return 1
if user is None:
raise Errors.MMBadUserError
addr = self.FindUser(user)
if addr is None:
raise Errors.MMNotAMemberError
storedpw = self.passwords.get(addr)
if storedpw is None:
raise Errors.MMBadUserError
if storedpw <> pw:
raise Errors.MMBadPasswordError
return 1
def ChangeUserPassword(self, user, newpw, confirm):
self.IsListInitialized()
addr = self.FindUser(user)
if not addr:
raise Errors.MMNotAMemberError
if newpw <> confirm:
raise Errors.MMPasswordsMustMatch
self.passwords[addr] = newpw
self.Save()
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