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# Copyright (C) 1998 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 string
import time
import types
import Crypt
import Errors
import Utils
import Cookie
from urlparse import urlparse
import mm_cfg
# TBD: is this the best location for the site password?
SITE_PW_FILE = os.path.join(mm_cfg.DATA_DIR, 'adm.pw')
class SecurityManager:
def SetSiteAdminPassword(self, pw):
fp = Utils.open_ex(SITE_PW_FILE, 'w', perms=0640)
fp.write(Crypt.crypt(pw, Utils.GetRandomSeed()))
fp.close()
def CheckSiteAdminPassword(self, str):
try:
f = open(SITE_PW_FILE, "r")
pw = f.read()
f.close()
salt = self.password[:2]
# crypt() has a bug in that if the salt is the empty string, it will
# always return the empty string, regardless of the key. :(
if len(salt) < 2:
return 0
return Crypt.crypt(str, pw) == pw
# There probably is no site admin password if there was an exception
except:
return 0
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, pw):
if self.CheckSiteAdminPassword(pw):
return 1
salt = self.password[:2]
# crypt() has a bug in that if the salt is the empty string, it will
# always return the empty string, regardless of the key. :(
if len(salt) < 2:
return 0
return Crypt.crypt(pw, salt) == self.password
def ConfirmAdminPassword(self, pw):
if not self.ValidAdminPassword(pw):
raise Errors.MMBadPasswordError
return 1
def WebAuthenticate(self, user=None, password=None, cookie=None):
if cookie:
cookie_key = self._internal_name + ':' + cookie
else:
cookie_key = self._internal_name
if password is not None: # explicit login
if user:
self.ConfirmUserPassword(user, password)
else:
self.ConfirmAdminPassword(password)
print self.MakeCookie(cookie_key)
return 1
else:
return self.CheckCookie(cookie_key)
def MakeCookie(self, key):
# Make sure we have the necessary ingredients for our cookie
client_ip = os.environ.get('REMOTE_ADDR') or '0.0.0.0'
issued = int(time.time())
expires = issued + mm_cfg.ADMIN_COOKIE_LIFE
# ... including the secret ingredient :)
secret = self.password
mac = hash(secret + client_ip + `issued` + `expires`)
# Mix all ingredients gently together,
c = Cookie.Cookie()
c[key] = [client_ip, issued, expires, mac]
# place in oven,
path = urlparse(self.web_page_url)[2] # '/mailman'
c[key]['path'] = path
# and bake until golden brown
c[key]['expires'] = mm_cfg.ADMIN_COOKIE_LIFE
return c
def CheckCookie(self, key):
cookiedata = os.environ.get('HTTP_COOKIE')
if not cookiedata:
return 0
#
# TBD: At least some versions of MS Internet Explorer stores cookies
# without the double quotes. This has been verified for MSIE 4.01,
# although MSIE 5 is fixed. The bug (see PR#80) is that if these
# double quotes are missing, the cookie data does not unpickle into
# the list that we expect. The kludge given here (slightly modified)
# was initially provided by Evaldas Auryla <evaldas.auryla@pheur.org>
#
## self.LogMsg('debug', 'Browser Cookie: ' + cookiedata)
keylen = len(key)
if cookiedata[keylen+1] <> '"' and cookiedata[-1] <> '"':
cookiedata = key + '="' + cookiedata[keylen+1:] + '"'
## self.LogMsg('debug', 'Using Cookie: ' + cookiedata)
c = Cookie.Cookie(cookiedata)
if not c.has_key(key):
return 0
cookie = c[key].value
if (type(cookie) <> type([]) or
len(cookie) <> 4):
raise Errors.MMInvalidCookieError
client_ip = os.environ.get('REMOTE_ADDR') or '0.0.0.0'
now = time.time()
[for_ip, issued, expires, received_mac] = cookie
if (for_ip <> client_ip or now < issued):
raise Errors.MMInvalidCookieError
if now > expires:
raise Errors.MMExpiredCookieError
secret = self.password
mac = hash(secret + client_ip + `issued` + `expires`)
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()
def ExtractApproval(self, msg):
"""True if message has valid administrator approval.
Approval line is always stripped from message as a side effect.
"""
p = msg.getheader('approved')
if p is None:
return 0
del msg['approved'] # Mustn't deliver this line!!
return self.ValidAdminPassword(p)
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