wradmin/lib/mediawiki.py

   1 #!/usr/bin/python3.4
   2 # $Id$
   3 """MediaWiki communication functions"""
   4 import datetime
   5 import re
   6
   7 from authkit.users import UsersReadOnly, md5, AuthKitError
   8 import formencode, formencode.national
   9
  10 import logging
  11 log = logging.getLogger(__name__)
  12
  13 import wradmin.model as model
  14
  15
  16 # User management
  17 # ---------------
  18
  19 class MediaWikiUsers(UsersReadOnly):
  20     def __init__(self, data=None, encrypt=None):
  21         UsersReadOnly.__init__(self, data, encrypt)
  22
  23         # Initialize class fields
  24         self.usernames = []
  25         self.passwords = {}
  26         self.roles = {}
  27         self.groups = {}
  28         self.user_ids = {} # MediaWiki user_id field of the database
  29         self.real_names = {} # Real names of the users
  30         self.emails = {} # E-Mail addresses of the users
  31
  32         # Query database
  33         con = model.meta.engine.connect()
  34         sql = "SELECT user_id, user_name, user_real_name, user_password, user_email FROM user, user_groups WHERE ug_user=user_id AND ug_group='beauftragte'"
  35         result = con.execute(sql)
  36         for row in result:
  37             user_id, username, real_name, password, email = row
  38             username = username.lower()
  39             role = []
  40             group = None
  41
  42             self.usernames.append(username)
  43             self.passwords[username] = password
  44             self.roles[username] = role
  45             self.groups[username] = group
  46             self.user_ids[username] = user_id
  47             self.real_names[username] = real_name
  48             self.emails[username] = email
  49         con.close()
  50         log.info("%d users loaded from the MediaWiki database" % len(self.usernames))
  51
  52     @staticmethod
  53     def password_is_correct(password_plain, password_db):
  54         """Returns true if a plain text password corresponds to the hash of the password as stored in the MediaWiki db.
  55
  56         :param password_plain: plain text password, e.g. 'abc'
  57         :param password_db: complete password line as stored in the database, e.g. ':pbkdf2:sha256:10000:128:EXgVGhc2mAs710feKvkiaw==:J5fYth9pg/R2d0F8bSsYfTR8SBpTBNIcdv/DgJ0tOPC1rtajl2Dr0RLqOozLb8O0XpDhtv4a3JJd/M0b58WebfNWAcdJBJI9nNeC0EYYD7OCYZGVAaRhiYtK4m53KZBBL6x/k2j4RjHPT1NmgV8Fr1DPqBNOlOHxUIh5z5oslM4='
  58         """
  59         if not password_db.startswith(':'):
  60             raise AuthKitError("Password entry in the database does have an unexpected format (does not start with ':').")
  61         pwd_parts = password_db[1:].split(':')
  62         pwd_type = pwd_parts[0]
  63         if pwd_type == 'B':
  64             # legacy
  65             # example: password_db == ':B:d25b2886:41e46c952790b1b442aac4f24f7ea7a8'
  66             # pwd_parts == ['B', 'd25b2886', '41e46c952790b1b442aac4f24f7ea7a8']
  67             if len(pwd_parts) != 3:
  68                 raise AuthKitError("Password entry in the database does have an unexpected format (too few ':').")
  69             salt, pwd_md5 = tuple(pwd_parts[1:3]) # salt = 'd25b2886'; pwd_md5 = '41e46c952790b1b442aac4f24f7ea7a8'
  70             # log.info("user: '%s'; md5 of salt+' '+entered_pwd: '%s'; md5-part of DB-pwd: %s" % (username, md5(salt + '-' + md5(password)), pwd_md5))
  71             return md5(salt + '-' + md5(password_plain)) == pwd_md5
  72         elif pwd_type == 'pbkdf2':
  73             if len(pwd_parts) != 6:
  74                 raise AuthKitError("Password entry in the database does have an unexpected format (too few ':').")
  75             _, algorithm, rounds, num_bit, salt, pwd_hash = pwd_parts
  76             from base64 import b64decode, b64encode
  77             from hashlib import pbkdf2_hmac
  78             salt = b64decode(salt)
  79             hash = pbkdf2_hmac(algorithm, password_plain, salt, int(rounds), int(num_bit))
  80             hash = b64encode(hash)
  81             return hash == pwd_hash
  82
  83
  84     def user_has_password(self, username, password):
  85         """
  86         Passwords are case sensitive.
  87         Returns ``True`` if the user has the password specified, ``False`` otherwise.
  88         Raises an exception if the user doesn't exist.
  89
  90         See http://www.winterrodeln.org/trac/wiki/MediaWikiAuthorization
  91         """
  92         password_db = self.user_password(username)
  93         return self.password_is_correct(password, password_db)