Move password_is_correct to auth module.

[philipp/winterrodeln/wradmin.git] / wradmin / auth / __init__.py

diff --git a/wradmin/auth/__init__.py b/wradmin/auth/__init__.py
new file mode 100644 (file)
index 0000000..1292b99
--- /dev/null
+++ b/wradmin/auth/__init__.py
@@ -0,0 +1,32 @@
+from authkit.users import md5, AuthKitError
+
+
+def password_is_correct(password_plain, password_db):
+    """Returns true if a plain text password corresponds to the hash of the password as stored in the MediaWiki db.
+
+    :param password_plain: plain text password, e.g. 'abc'
+    :param password_db: complete password line as stored in the database, e.g. ':pbkdf2:sha256:10000:128:EXgVGhc2mAs710feKvkiaw==:J5fYth9pg/R2d0F8bSsYfTR8SBpTBNIcdv/DgJ0tOPC1rtajl2Dr0RLqOozLb8O0XpDhtv4a3JJd/M0b58WebfNWAcdJBJI9nNeC0EYYD7OCYZGVAaRhiYtK4m53KZBBL6x/k2j4RjHPT1NmgV8Fr1DPqBNOlOHxUIh5z5oslM4='
+    """
+    if not password_db.startswith(':'):
+        raise AuthKitError("Password entry in the database does have an unexpected format (does not start with ':').")
+    pwd_parts = password_db[1:].split(':')
+    pwd_type = pwd_parts[0]
+    if pwd_type == 'B':
+        # legacy
+        # example: password_db == ':B:d25b2886:41e46c952790b1b442aac4f24f7ea7a8'
+        # pwd_parts == ['B', 'd25b2886', '41e46c952790b1b442aac4f24f7ea7a8']
+        if len(pwd_parts) != 3:
+            raise AuthKitError("Password entry in the database does have an unexpected format (too few ':').")
+        salt, pwd_md5 = tuple(pwd_parts[1:3])  # salt = 'd25b2886'; pwd_md5 = '41e46c952790b1b442aac4f24f7ea7a8'
+        # log.info("user: '%s'; md5 of salt+' '+entered_pwd: '%s'; md5-part of DB-pwd: %s" % (username, md5(salt + '-' + md5(password)), pwd_md5))
+        return md5(salt + '-' + md5(password_plain)) == pwd_md5
+    elif pwd_type == 'pbkdf2':
+        if len(pwd_parts) != 6:
+            raise AuthKitError("Password entry in the database does have an unexpected format (too few ':').")
+        _, algorithm, rounds, num_bit, salt, pwd_hash = pwd_parts
+        from base64 import b64decode, b64encode
+        from hashlib import pbkdf2_hmac
+        salt = b64decode(salt)
+        hash = pbkdf2_hmac(algorithm, password_plain, salt, int(rounds), int(num_bit))
+        hash = b64encode(hash)
+        return hash == pwd_hash