mirror of
https://gitlab2.federez.net/re2o/re2o
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118 lines
3.8 KiB
Python
118 lines
3.8 KiB
Python
# -*- mode: python; coding: utf-8 -*-
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# Re2o est un logiciel d'administration développé initiallement au rezometz. Il
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# se veut agnostique au réseau considéré, de manière à être installable en
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# quelques clics.
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#
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# Copyright © 2017 Gabriel Détraz
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# Copyright © 2017 Goulven Kermarec
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# Copyright © 2017 Augustin Lemesle
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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# -*- coding: utf-8 -*-
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# Module d'authentification
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# David Sinquin, Gabriel Détraz, Goulven Kermarec
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"""re2o.login
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Module in charge of handling the login process and verifications
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"""
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import hashlib
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import binascii
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import os
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from base64 import encodestring
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from base64 import decodestring
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from collections import OrderedDict
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from django.contrib.auth import hashers
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ALGO_NAME = "{SSHA}"
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ALGO_LEN = len(ALGO_NAME + "$")
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DIGEST_LEN = 20
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def makeSecret(password):
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""" Build a hashed and salted version of the password """
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salt = os.urandom(4)
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h = hashlib.sha1(password.encode())
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h.update(salt)
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return ALGO_NAME + "$" + encodestring(h.digest() + salt).decode()[:-1]
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def hashNT(password):
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""" Build a md4 hash of the password to use as the NT-password """
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hash_str = hashlib.new('md4', password.encode('utf-16le')).digest()
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return binascii.hexlify(hash_str).upper()
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def checkPassword(challenge_password, password):
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""" Check if a given password match the hash of a stored password """
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challenge_bytes = decodestring(challenge_password[ALGO_LEN:].encode())
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digest = challenge_bytes[:DIGEST_LEN]
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salt = challenge_bytes[DIGEST_LEN:]
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hr = hashlib.sha1(password.encode())
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hr.update(salt)
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valid_password = True
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# La comparaison est volontairement en temps constant
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# (pour éviter les timing-attacks)
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for i, j in zip(digest, hr.digest()):
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valid_password &= i == j
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return valid_password
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class SSHAPasswordHasher(hashers.BasePasswordHasher):
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"""
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SSHA password hashing to allow for LDAP auth compatibility
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"""
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algorithm = ALGO_NAME
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def encode(self, password, salt):
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"""
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Hash and salt the given password using SSHA algorithm
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salt is overridden
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"""
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assert password is not None
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return makeSecret(password)
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def verify(self, password, encoded):
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"""
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Check password against encoded using SSHA algorithm
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"""
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assert encoded.startswith(self.algorithm)
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return checkPassword(encoded, password)
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def safe_summary(self, encoded):
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"""
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Provides a safe summary of the password
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"""
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assert encoded.startswith(self.algorithm)
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hash_str = encoded[ALGO_LEN:]
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hash_str = binascii.hexlify(decodestring(hash_str.encode())).decode()
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return OrderedDict([
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('algorithm', self.algorithm),
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('iterations', 0),
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('salt', hashers.mask_hash(hash_str[2*DIGEST_LEN:], show=2)),
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('hash', hashers.mask_hash(hash_str[:2*DIGEST_LEN])),
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])
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def harden_runtime(self, password, encoded):
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"""
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Method implemented to shut up BasePasswordHasher warning
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As we are not using multiple iterations the method is pretty useless
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"""
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pass
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