1 from authkit.users import md5, AuthKitError
4 def password_is_correct(password_plain, password_db):
5 """Returns true if a plain text password corresponds to the hash of the password as stored in the MediaWiki db.
7 :param password_plain: plain text password, e.g. 'abc'
8 :param password_db: complete password line as stored in the database, e.g. ':pbkdf2:sha256:10000:128:EXgVGhc2mAs710feKvkiaw==:J5fYth9pg/R2d0F8bSsYfTR8SBpTBNIcdv/DgJ0tOPC1rtajl2Dr0RLqOozLb8O0XpDhtv4a3JJd/M0b58WebfNWAcdJBJI9nNeC0EYYD7OCYZGVAaRhiYtK4m53KZBBL6x/k2j4RjHPT1NmgV8Fr1DPqBNOlOHxUIh5z5oslM4='
10 if not password_db.startswith(':'):
11 raise AuthKitError("Password entry in the database does have an unexpected format (does not start with ':').")
12 pwd_parts = password_db[1:].split(':')
13 pwd_type = pwd_parts[0]
16 # example: password_db == ':B:d25b2886:41e46c952790b1b442aac4f24f7ea7a8'
17 # pwd_parts == ['B', 'd25b2886', '41e46c952790b1b442aac4f24f7ea7a8']
18 if len(pwd_parts) != 3:
19 raise AuthKitError("Password entry in the database does have an unexpected format (too few ':').")
20 salt, pwd_md5 = tuple(pwd_parts[1:3]) # salt = 'd25b2886'; pwd_md5 = '41e46c952790b1b442aac4f24f7ea7a8'
21 # log.info("user: '%s'; md5 of salt+' '+entered_pwd: '%s'; md5-part of DB-pwd: %s" % (username, md5(salt + '-' + md5(password)), pwd_md5))
22 return md5(salt + '-' + md5(password_plain)) == pwd_md5
23 elif pwd_type == 'pbkdf2':
24 if len(pwd_parts) != 6:
25 raise AuthKitError("Password entry in the database does have an unexpected format (too few ':').")
26 _, algorithm, rounds, num_bit, salt, pwd_hash = pwd_parts
27 from base64 import b64decode, b64encode
28 from hashlib import pbkdf2_hmac
29 salt = b64decode(salt)
30 hash = pbkdf2_hmac(algorithm, password_plain, salt, int(rounds), int(num_bit))
31 hash = b64encode(hash)
32 return hash == pwd_hash