Add some password check methods to the MySQL auth backend
This commit is contained in:
Valentin Samir
parent
b36a9a1523
commit
ac206d56d6
3 changed files with 175 additions and 13 deletions
14
README.rst
14
README.rst
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@ -199,8 +199,18 @@ Mysql backend settings. Only usefull if you are using the mysql authentication b
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The username must be in field ``username``, the password in ``password``,
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additional fields are used as the user attributes.
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The default is ``"SELECT user AS usersame, pass AS password, users.* FROM users WHERE user = %s"``
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* ``CAS_SQL_PASSWORD_CHECK``: The method used to check the user password. Must be
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``"crypt"`` or ``"plain``". The default is ``"crypt"``.
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* ``CAS_SQL_PASSWORD_CHECK``: The method used to check the user password. Must be one of the following:
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* ``"crypt"`` (see `<https://en.wikipedia.org/wiki/Crypt_(C)>`), the password in the database
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should begin this $
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* ``"ldap"`` (see https://tools.ietf.org/id/draft-stroeder-hashed-userpassword-values-01.html)
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the password in the database must begin with one of {MD5}, {SMD5}, {SHA}, {SSHA}, {SHA256},
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{SSHA256}, {SHA384}, {SSHA384}, {SHA512}, {SSHA512}, {CRYPT}.
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* ``"hex_HASH_NAME"`` with ``HASH_NAME`` in md5, sha1, sha224, sha256, sha384, sha512.
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The hashed password in the database is compare to the hexadecimal digest of the clear
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password hashed with the corresponding algorithm.
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* ``"plain"``, the password in the database must be in clear.
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The default is ``"crypt"``.
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Test backend settings. Only usefull if you are using the test authentication backend:
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@ -16,6 +16,7 @@ try: # pragma: no cover
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import MySQLdb
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import MySQLdb.cursors
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import crypt
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from utils import check_password
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except ImportError:
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MySQLdb = None
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@ -90,17 +91,12 @@ class MysqlAuthUser(AuthUser): # pragma: no cover
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def test_password(self, password):
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"""test `password` agains the user"""
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if self.user:
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if settings.CAS_SQL_PASSWORD_CHECK == "plain":
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return password == self.user["password"]
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elif settings.CAS_SQL_PASSWORD_CHECK == "crypt":
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if self.user["password"].startswith('$'):
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salt = '$'.join(self.user["password"].split('$', 3)[:-1])
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return crypt.crypt(password, salt) == self.user["password"]
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else:
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return crypt.crypt(
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check_password(
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settings.CAS_SQL_PASSWORD_CHECK,
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password,
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self.user["password"][:2]
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) == self.user["password"]
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self.user["password"],
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settings.CAS_SQL_DBCHARSET
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)
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else:
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return False
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@ -19,6 +19,10 @@ from django.contrib import messages
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import random
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import string
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import json
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import hashlib
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import crypt
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import base64
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import six
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from threading import Thread
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from importlib import import_module
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from six.moves import BaseHTTPServer
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@ -172,3 +176,155 @@ class PGTUrlHandler(BaseHTTPServer.BaseHTTPRequestHandler):
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httpd_thread.daemon = True
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httpd_thread.start()
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return (httpd_thread, host, port)
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class LdapHashUserPassword(object):
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"""Please see https://tools.ietf.org/id/draft-stroeder-hashed-userpassword-values-01.html"""
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schemes_salt = {b"{SMD5}", b"{SSHA}", b"{SSHA256}", b"{SSHA384}", b"{SSHA512}", b"{CRYPT}"}
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schemes_nosalt = {b"{MD5}", b"{SHA}", b"{SHA256}", b"{SHA384}", b"{SHA512}"}
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_schemes_to_hash = {
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b"{SMD5}": hashlib.md5,
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b"{MD5}": hashlib.md5,
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b"{SSHA}": hashlib.sha1,
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b"{SHA}": hashlib.sha1,
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b"{SSHA256}": hashlib.sha256,
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b"{SHA256}": hashlib.sha256,
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b"{SSHA384}": hashlib.sha384,
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b"{SHA384}": hashlib.sha384,
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b"{SSHA512}": hashlib.sha512,
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b"{SHA512}": hashlib.sha512
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}
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_schemes_to_len = {
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b"{SMD5}": 16,
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b"{SSHA}": 20,
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b"{SSHA256}": 32,
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b"{SSHA384}": 48,
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b"{SSHA512}": 64,
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}
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class BadScheme(ValueError):
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pass
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class BadHash(ValueError):
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pass
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class BadSalt(ValueError):
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pass
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@classmethod
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def _raise_bad_scheme(cls, scheme, valid, msg):
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valid_schemes = [s for s in valid]
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valid_schemes.sort()
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raise cls.BadScheme(msg % (scheme, ", ".join(valid_schemes)))
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@classmethod
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def _test_scheme(cls, scheme):
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if scheme not in cls.schemes_salt and scheme not in cls.schemes_nosalt:
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cls._raise_bad_scheme(
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scheme,
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cls.schemes_salt | cls.schemes_nosalt,
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"The scheme %r is not valid. Valide schemes are %s."
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)
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@classmethod
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def _test_scheme_salt(cls, scheme):
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if scheme not in cls.schemes_salt:
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cls._raise_bad_scheme(
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scheme,
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cls.schemes_salt,
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"The scheme %r is only valid without a salt. Valide schemes with salt are %s."
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)
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@classmethod
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def _test_scheme_nosalt(cls, scheme):
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if scheme not in cls.schemes_nosalt:
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cls._raise_bad_scheme(
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scheme,
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cls.schemes_nosalt,
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"The scheme %r is only valid with a salt. Valide schemes without salt are %s."
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)
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@classmethod
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def hash(cls, scheme, password, salt=None, charset="utf8"):
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scheme = scheme.upper()
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cls._test_scheme(scheme)
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if salt is None or salt == b"":
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salt = b""
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cls._test_scheme_nosalt(scheme)
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elif salt is not None:
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cls._test_scheme_salt(scheme)
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try:
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return scheme + base64.b64encode(cls._schemes_to_hash[scheme](password + salt).digest() + salt)
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except KeyError:
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if six.PY3:
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password = password.decode(charset)
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salt = salt.decode(charset)
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hashed_password = crypt.crypt(password, salt)
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if hashed_password is None:
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raise cls.BadSalt("System crypt implementation do not support the salt %r" % salt)
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if six.PY3:
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hashed_password = hashed_password.encode(charset)
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return scheme + hashed_password
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@classmethod
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def get_scheme(cls, hashed_passord):
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if not hashed_passord[0] == b'{' or not b'}' in hashed_passord:
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raise cls.BadHash("%r should start with the scheme enclosed with { }" % hashed_passord)
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scheme = hashed_passord.split(b'}', 1)[0]
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scheme = scheme.upper() + b"}"
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return scheme
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@classmethod
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def get_salt(cls, hashed_passord):
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scheme = cls.get_scheme(hashed_passord)
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cls._test_scheme(scheme)
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if scheme in cls.schemes_nosalt:
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return b""
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elif scheme == b'{CRYPT}':
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return b'$'.join(hashed_passord.split(b'$', 3)[:-1])
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else:
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hashed_passord = base64.b64decode(hashed_passord[len(scheme):])
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if len(hashed_passord) < cls._schemes_to_len[scheme]:
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raise cls.BadHash("Hash too short for the scheme %s" % scheme)
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return hashed_passord[cls._schemes_to_len[scheme]:]
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def check_password(method, password, hashed_password, charset):
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if not isinstance(password, six.binary_type):
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password = password.encode(charset)
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if not isinstance(hashed_password, six.binary_type):
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hashed_password = hashed_password.encode(charset)
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if method == "plain":
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return password == hashed_password
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elif method == "crypt":
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if hashed_password.startswith(b'$'):
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salt = b'$'.join(hashed_password.split(b'$', 3)[:-1])
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elif hashed_password.startswith(b'_'):
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salt = hashed_password[:9]
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else:
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salt = hashed_password[:2]
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if six.PY3:
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password = password.decode(charset)
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salt = salt.decode(charset)
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hashed_password = hashed_password.decode(charset)
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crypted_password = crypt.crypt(password, salt)
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if crypted_password is None:
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raise ValueError("System crypt implementation do not support the salt %r" % salt)
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return crypted_password == hashed_password
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elif method == "ldap":
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scheme = LdapHashUserPassword.get_scheme(hashed_password)
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salt = LdapHashUserPassword.get_salt(hashed_password)
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return LdapHashUserPassword.hash(scheme, password, salt, charset=charset) == hashed_password
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elif (
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method.startswith("hex_") and
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method[4:] in {"md5", "sha1", "sha224", "sha256", "sha384", "sha512"}
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):
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return getattr(hashlib, method[4:])(password).hexdigest() == hashed_password.lower()
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else:
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raise ValueError("Unknown password method check %r" % method)
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