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637 lines
21 KiB
Python
637 lines
21 KiB
Python
import base64
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import binascii
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import functools
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import hashlib
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import importlib
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import warnings
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from django.conf import settings
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from django.core.exceptions import ImproperlyConfigured
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from django.core.signals import setting_changed
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from django.dispatch import receiver
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from django.utils.crypto import (
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constant_time_compare, get_random_string, pbkdf2,
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)
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from django.utils.module_loading import import_string
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from django.utils.translation import gettext_noop as _
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UNUSABLE_PASSWORD_PREFIX = '!' # This will never be a valid encoded hash
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UNUSABLE_PASSWORD_SUFFIX_LENGTH = 40 # number of random chars to add after UNUSABLE_PASSWORD_PREFIX
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def is_password_usable(encoded):
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"""
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Return True if this password wasn't generated by
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User.set_unusable_password(), i.e. make_password(None).
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"""
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return encoded is None or not encoded.startswith(UNUSABLE_PASSWORD_PREFIX)
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def check_password(password, encoded, setter=None, preferred='default'):
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"""
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Return a boolean of whether the raw password matches the three
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part encoded digest.
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If setter is specified, it'll be called when you need to
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regenerate the password.
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"""
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if password is None or not is_password_usable(encoded):
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return False
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preferred = get_hasher(preferred)
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try:
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hasher = identify_hasher(encoded)
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except ValueError:
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# encoded is gibberish or uses a hasher that's no longer installed.
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return False
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hasher_changed = hasher.algorithm != preferred.algorithm
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must_update = hasher_changed or preferred.must_update(encoded)
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is_correct = hasher.verify(password, encoded)
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# If the hasher didn't change (we don't protect against enumeration if it
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# does) and the password should get updated, try to close the timing gap
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# between the work factor of the current encoded password and the default
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# work factor.
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if not is_correct and not hasher_changed and must_update:
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hasher.harden_runtime(password, encoded)
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if setter and is_correct and must_update:
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setter(password)
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return is_correct
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def make_password(password, salt=None, hasher='default'):
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"""
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Turn a plain-text password into a hash for database storage
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Same as encode() but generate a new random salt. If password is None then
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return a concatenation of UNUSABLE_PASSWORD_PREFIX and a random string,
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which disallows logins. Additional random string reduces chances of gaining
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access to staff or superuser accounts. See ticket #20079 for more info.
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"""
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if password is None:
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return UNUSABLE_PASSWORD_PREFIX + get_random_string(UNUSABLE_PASSWORD_SUFFIX_LENGTH)
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hasher = get_hasher(hasher)
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salt = salt or hasher.salt()
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return hasher.encode(password, salt)
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@functools.lru_cache()
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def get_hashers():
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hashers = []
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for hasher_path in settings.PASSWORD_HASHERS:
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hasher_cls = import_string(hasher_path)
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hasher = hasher_cls()
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if not getattr(hasher, 'algorithm'):
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raise ImproperlyConfigured("hasher doesn't specify an "
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"algorithm name: %s" % hasher_path)
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hashers.append(hasher)
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return hashers
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@functools.lru_cache()
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def get_hashers_by_algorithm():
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return {hasher.algorithm: hasher for hasher in get_hashers()}
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@receiver(setting_changed)
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def reset_hashers(**kwargs):
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if kwargs['setting'] == 'PASSWORD_HASHERS':
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get_hashers.cache_clear()
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get_hashers_by_algorithm.cache_clear()
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def get_hasher(algorithm='default'):
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"""
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Return an instance of a loaded password hasher.
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If algorithm is 'default', return the default hasher. Lazily import hashers
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specified in the project's settings file if needed.
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"""
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if hasattr(algorithm, 'algorithm'):
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return algorithm
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elif algorithm == 'default':
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return get_hashers()[0]
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else:
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hashers = get_hashers_by_algorithm()
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try:
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return hashers[algorithm]
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except KeyError:
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raise ValueError("Unknown password hashing algorithm '%s'. "
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"Did you specify it in the PASSWORD_HASHERS "
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"setting?" % algorithm)
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def identify_hasher(encoded):
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"""
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Return an instance of a loaded password hasher.
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Identify hasher algorithm by examining encoded hash, and call
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get_hasher() to return hasher. Raise ValueError if
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algorithm cannot be identified, or if hasher is not loaded.
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"""
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# Ancient versions of Django created plain MD5 passwords and accepted
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# MD5 passwords with an empty salt.
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if ((len(encoded) == 32 and '$' not in encoded) or
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(len(encoded) == 37 and encoded.startswith('md5$$'))):
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algorithm = 'unsalted_md5'
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# Ancient versions of Django accepted SHA1 passwords with an empty salt.
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elif len(encoded) == 46 and encoded.startswith('sha1$$'):
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algorithm = 'unsalted_sha1'
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else:
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algorithm = encoded.split('$', 1)[0]
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return get_hasher(algorithm)
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def mask_hash(hash, show=6, char="*"):
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"""
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Return the given hash, with only the first ``show`` number shown. The
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rest are masked with ``char`` for security reasons.
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"""
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masked = hash[:show]
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masked += char * len(hash[show:])
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return masked
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class BasePasswordHasher:
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"""
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Abstract base class for password hashers
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When creating your own hasher, you need to override algorithm,
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verify(), encode() and safe_summary().
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PasswordHasher objects are immutable.
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"""
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algorithm = None
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library = None
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def _load_library(self):
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if self.library is not None:
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if isinstance(self.library, (tuple, list)):
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name, mod_path = self.library
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else:
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mod_path = self.library
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try:
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module = importlib.import_module(mod_path)
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except ImportError as e:
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raise ValueError("Couldn't load %r algorithm library: %s" %
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(self.__class__.__name__, e))
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return module
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raise ValueError("Hasher %r doesn't specify a library attribute" %
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self.__class__.__name__)
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def salt(self):
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"""Generate a cryptographically secure nonce salt in ASCII."""
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return get_random_string()
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def verify(self, password, encoded):
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"""Check if the given password is correct."""
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raise NotImplementedError('subclasses of BasePasswordHasher must provide a verify() method')
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def encode(self, password, salt):
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"""
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Create an encoded database value.
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The result is normally formatted as "algorithm$salt$hash" and
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must be fewer than 128 characters.
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"""
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raise NotImplementedError('subclasses of BasePasswordHasher must provide an encode() method')
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def safe_summary(self, encoded):
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"""
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Return a summary of safe values.
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The result is a dictionary and will be used where the password field
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must be displayed to construct a safe representation of the password.
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"""
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raise NotImplementedError('subclasses of BasePasswordHasher must provide a safe_summary() method')
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def must_update(self, encoded):
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return False
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def harden_runtime(self, password, encoded):
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"""
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Bridge the runtime gap between the work factor supplied in `encoded`
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and the work factor suggested by this hasher.
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Taking PBKDF2 as an example, if `encoded` contains 20000 iterations and
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`self.iterations` is 30000, this method should run password through
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another 10000 iterations of PBKDF2. Similar approaches should exist
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for any hasher that has a work factor. If not, this method should be
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defined as a no-op to silence the warning.
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"""
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warnings.warn('subclasses of BasePasswordHasher should provide a harden_runtime() method')
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class PBKDF2PasswordHasher(BasePasswordHasher):
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"""
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Secure password hashing using the PBKDF2 algorithm (recommended)
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Configured to use PBKDF2 + HMAC + SHA256.
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The result is a 64 byte binary string. Iterations may be changed
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safely but you must rename the algorithm if you change SHA256.
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"""
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algorithm = "pbkdf2_sha256"
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iterations = 180000
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digest = hashlib.sha256
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def encode(self, password, salt, iterations=None):
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assert password is not None
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assert salt and '$' not in salt
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iterations = iterations or self.iterations
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hash = pbkdf2(password, salt, iterations, digest=self.digest)
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hash = base64.b64encode(hash).decode('ascii').strip()
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return "%s$%d$%s$%s" % (self.algorithm, iterations, salt, hash)
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def verify(self, password, encoded):
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algorithm, iterations, salt, hash = encoded.split('$', 3)
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assert algorithm == self.algorithm
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encoded_2 = self.encode(password, salt, int(iterations))
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return constant_time_compare(encoded, encoded_2)
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def safe_summary(self, encoded):
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algorithm, iterations, salt, hash = encoded.split('$', 3)
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assert algorithm == self.algorithm
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return {
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_('algorithm'): algorithm,
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_('iterations'): iterations,
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_('salt'): mask_hash(salt),
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_('hash'): mask_hash(hash),
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}
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def must_update(self, encoded):
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algorithm, iterations, salt, hash = encoded.split('$', 3)
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return int(iterations) != self.iterations
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def harden_runtime(self, password, encoded):
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algorithm, iterations, salt, hash = encoded.split('$', 3)
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extra_iterations = self.iterations - int(iterations)
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if extra_iterations > 0:
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self.encode(password, salt, extra_iterations)
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class PBKDF2SHA1PasswordHasher(PBKDF2PasswordHasher):
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"""
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Alternate PBKDF2 hasher which uses SHA1, the default PRF
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recommended by PKCS #5. This is compatible with other
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implementations of PBKDF2, such as openssl's
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PKCS5_PBKDF2_HMAC_SHA1().
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"""
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algorithm = "pbkdf2_sha1"
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digest = hashlib.sha1
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class Argon2PasswordHasher(BasePasswordHasher):
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"""
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Secure password hashing using the argon2 algorithm.
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This is the winner of the Password Hashing Competition 2013-2015
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(https://password-hashing.net). It requires the argon2-cffi library which
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depends on native C code and might cause portability issues.
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"""
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algorithm = 'argon2'
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library = 'argon2'
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time_cost = 2
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memory_cost = 512
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parallelism = 2
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def encode(self, password, salt):
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argon2 = self._load_library()
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data = argon2.low_level.hash_secret(
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password.encode(),
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salt.encode(),
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time_cost=self.time_cost,
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memory_cost=self.memory_cost,
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parallelism=self.parallelism,
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hash_len=argon2.DEFAULT_HASH_LENGTH,
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type=argon2.low_level.Type.I,
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)
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return self.algorithm + data.decode('ascii')
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def verify(self, password, encoded):
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argon2 = self._load_library()
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algorithm, rest = encoded.split('$', 1)
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assert algorithm == self.algorithm
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try:
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return argon2.low_level.verify_secret(
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('$' + rest).encode('ascii'),
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password.encode(),
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type=argon2.low_level.Type.I,
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)
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except argon2.exceptions.VerificationError:
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return False
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def safe_summary(self, encoded):
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(algorithm, variety, version, time_cost, memory_cost, parallelism,
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salt, data) = self._decode(encoded)
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assert algorithm == self.algorithm
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return {
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_('algorithm'): algorithm,
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_('variety'): variety,
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_('version'): version,
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_('memory cost'): memory_cost,
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_('time cost'): time_cost,
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_('parallelism'): parallelism,
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_('salt'): mask_hash(salt),
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_('hash'): mask_hash(data),
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}
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def must_update(self, encoded):
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(algorithm, variety, version, time_cost, memory_cost, parallelism,
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salt, data) = self._decode(encoded)
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assert algorithm == self.algorithm
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argon2 = self._load_library()
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return (
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argon2.low_level.ARGON2_VERSION != version or
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self.time_cost != time_cost or
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self.memory_cost != memory_cost or
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self.parallelism != parallelism
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)
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def harden_runtime(self, password, encoded):
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# The runtime for Argon2 is too complicated to implement a sensible
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# hardening algorithm.
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pass
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def _decode(self, encoded):
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"""
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Split an encoded hash and return: (
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algorithm, variety, version, time_cost, memory_cost,
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parallelism, salt, data,
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).
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"""
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bits = encoded.split('$')
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if len(bits) == 5:
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# Argon2 < 1.3
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algorithm, variety, raw_params, salt, data = bits
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version = 0x10
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else:
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assert len(bits) == 6
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algorithm, variety, raw_version, raw_params, salt, data = bits
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assert raw_version.startswith('v=')
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version = int(raw_version[len('v='):])
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params = dict(bit.split('=', 1) for bit in raw_params.split(','))
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assert len(params) == 3 and all(x in params for x in ('t', 'm', 'p'))
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time_cost = int(params['t'])
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memory_cost = int(params['m'])
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parallelism = int(params['p'])
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return (
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algorithm, variety, version, time_cost, memory_cost, parallelism,
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salt, data,
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)
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class BCryptSHA256PasswordHasher(BasePasswordHasher):
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"""
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Secure password hashing using the bcrypt algorithm (recommended)
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This is considered by many to be the most secure algorithm but you
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must first install the bcrypt library. Please be warned that
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this library depends on native C code and might cause portability
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issues.
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"""
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algorithm = "bcrypt_sha256"
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digest = hashlib.sha256
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library = ("bcrypt", "bcrypt")
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rounds = 12
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def salt(self):
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bcrypt = self._load_library()
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return bcrypt.gensalt(self.rounds)
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def encode(self, password, salt):
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bcrypt = self._load_library()
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password = password.encode()
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# Hash the password prior to using bcrypt to prevent password
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# truncation as described in #20138.
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if self.digest is not None:
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# Use binascii.hexlify() because a hex encoded bytestring is str.
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password = binascii.hexlify(self.digest(password).digest())
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data = bcrypt.hashpw(password, salt)
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return "%s$%s" % (self.algorithm, data.decode('ascii'))
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def verify(self, password, encoded):
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algorithm, data = encoded.split('$', 1)
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assert algorithm == self.algorithm
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encoded_2 = self.encode(password, data.encode('ascii'))
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return constant_time_compare(encoded, encoded_2)
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def safe_summary(self, encoded):
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algorithm, empty, algostr, work_factor, data = encoded.split('$', 4)
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assert algorithm == self.algorithm
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salt, checksum = data[:22], data[22:]
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return {
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_('algorithm'): algorithm,
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_('work factor'): work_factor,
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_('salt'): mask_hash(salt),
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_('checksum'): mask_hash(checksum),
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}
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def must_update(self, encoded):
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algorithm, empty, algostr, rounds, data = encoded.split('$', 4)
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return int(rounds) != self.rounds
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def harden_runtime(self, password, encoded):
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_, data = encoded.split('$', 1)
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salt = data[:29] # Length of the salt in bcrypt.
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rounds = data.split('$')[2]
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# work factor is logarithmic, adding one doubles the load.
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diff = 2**(self.rounds - int(rounds)) - 1
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while diff > 0:
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self.encode(password, salt.encode('ascii'))
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diff -= 1
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class BCryptPasswordHasher(BCryptSHA256PasswordHasher):
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"""
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Secure password hashing using the bcrypt algorithm
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This is considered by many to be the most secure algorithm but you
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must first install the bcrypt library. Please be warned that
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this library depends on native C code and might cause portability
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issues.
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This hasher does not first hash the password which means it is subject to
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bcrypt's 72 bytes password truncation. Most use cases should prefer the
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BCryptSHA256PasswordHasher.
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"""
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algorithm = "bcrypt"
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digest = None
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|
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class SHA1PasswordHasher(BasePasswordHasher):
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"""
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The SHA1 password hashing algorithm (not recommended)
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"""
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algorithm = "sha1"
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def encode(self, password, salt):
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assert password is not None
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assert salt and '$' not in salt
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hash = hashlib.sha1((salt + password).encode()).hexdigest()
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return "%s$%s$%s" % (self.algorithm, salt, hash)
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def verify(self, password, encoded):
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algorithm, salt, hash = encoded.split('$', 2)
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assert algorithm == self.algorithm
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encoded_2 = self.encode(password, salt)
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return constant_time_compare(encoded, encoded_2)
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def safe_summary(self, encoded):
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algorithm, salt, hash = encoded.split('$', 2)
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assert algorithm == self.algorithm
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return {
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_('algorithm'): algorithm,
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_('salt'): mask_hash(salt, show=2),
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_('hash'): mask_hash(hash),
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}
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def harden_runtime(self, password, encoded):
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pass
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class MD5PasswordHasher(BasePasswordHasher):
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"""
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The Salted MD5 password hashing algorithm (not recommended)
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"""
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algorithm = "md5"
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def encode(self, password, salt):
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assert password is not None
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assert salt and '$' not in salt
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hash = hashlib.md5((salt + password).encode()).hexdigest()
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return "%s$%s$%s" % (self.algorithm, salt, hash)
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|
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def verify(self, password, encoded):
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algorithm, salt, hash = encoded.split('$', 2)
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assert algorithm == self.algorithm
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encoded_2 = self.encode(password, salt)
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return constant_time_compare(encoded, encoded_2)
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|
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def safe_summary(self, encoded):
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algorithm, salt, hash = encoded.split('$', 2)
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assert algorithm == self.algorithm
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return {
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_('algorithm'): algorithm,
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_('salt'): mask_hash(salt, show=2),
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_('hash'): mask_hash(hash),
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}
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def harden_runtime(self, password, encoded):
|
|
pass
|
|
|
|
|
|
class UnsaltedSHA1PasswordHasher(BasePasswordHasher):
|
|
"""
|
|
Very insecure algorithm that you should *never* use; store SHA1 hashes
|
|
with an empty salt.
|
|
|
|
This class is implemented because Django used to accept such password
|
|
hashes. Some older Django installs still have these values lingering
|
|
around so we need to handle and upgrade them properly.
|
|
"""
|
|
algorithm = "unsalted_sha1"
|
|
|
|
def salt(self):
|
|
return ''
|
|
|
|
def encode(self, password, salt):
|
|
assert salt == ''
|
|
hash = hashlib.sha1(password.encode()).hexdigest()
|
|
return 'sha1$$%s' % hash
|
|
|
|
def verify(self, password, encoded):
|
|
encoded_2 = self.encode(password, '')
|
|
return constant_time_compare(encoded, encoded_2)
|
|
|
|
def safe_summary(self, encoded):
|
|
assert encoded.startswith('sha1$$')
|
|
hash = encoded[6:]
|
|
return {
|
|
_('algorithm'): self.algorithm,
|
|
_('hash'): mask_hash(hash),
|
|
}
|
|
|
|
def harden_runtime(self, password, encoded):
|
|
pass
|
|
|
|
|
|
class UnsaltedMD5PasswordHasher(BasePasswordHasher):
|
|
"""
|
|
Incredibly insecure algorithm that you should *never* use; stores unsalted
|
|
MD5 hashes without the algorithm prefix, also accepts MD5 hashes with an
|
|
empty salt.
|
|
|
|
This class is implemented because Django used to store passwords this way
|
|
and to accept such password hashes. Some older Django installs still have
|
|
these values lingering around so we need to handle and upgrade them
|
|
properly.
|
|
"""
|
|
algorithm = "unsalted_md5"
|
|
|
|
def salt(self):
|
|
return ''
|
|
|
|
def encode(self, password, salt):
|
|
assert salt == ''
|
|
return hashlib.md5(password.encode()).hexdigest()
|
|
|
|
def verify(self, password, encoded):
|
|
if len(encoded) == 37 and encoded.startswith('md5$$'):
|
|
encoded = encoded[5:]
|
|
encoded_2 = self.encode(password, '')
|
|
return constant_time_compare(encoded, encoded_2)
|
|
|
|
def safe_summary(self, encoded):
|
|
return {
|
|
_('algorithm'): self.algorithm,
|
|
_('hash'): mask_hash(encoded, show=3),
|
|
}
|
|
|
|
def harden_runtime(self, password, encoded):
|
|
pass
|
|
|
|
|
|
class CryptPasswordHasher(BasePasswordHasher):
|
|
"""
|
|
Password hashing using UNIX crypt (not recommended)
|
|
|
|
The crypt module is not supported on all platforms.
|
|
"""
|
|
algorithm = "crypt"
|
|
library = "crypt"
|
|
|
|
def salt(self):
|
|
return get_random_string(2)
|
|
|
|
def encode(self, password, salt):
|
|
crypt = self._load_library()
|
|
assert len(salt) == 2
|
|
data = crypt.crypt(password, salt)
|
|
assert data is not None # A platform like OpenBSD with a dummy crypt module.
|
|
# we don't need to store the salt, but Django used to do this
|
|
return "%s$%s$%s" % (self.algorithm, '', data)
|
|
|
|
def verify(self, password, encoded):
|
|
crypt = self._load_library()
|
|
algorithm, salt, data = encoded.split('$', 2)
|
|
assert algorithm == self.algorithm
|
|
return constant_time_compare(data, crypt.crypt(password, data))
|
|
|
|
def safe_summary(self, encoded):
|
|
algorithm, salt, data = encoded.split('$', 2)
|
|
assert algorithm == self.algorithm
|
|
return {
|
|
_('algorithm'): algorithm,
|
|
_('salt'): salt,
|
|
_('hash'): mask_hash(data, show=3),
|
|
}
|
|
|
|
def harden_runtime(self, password, encoded):
|
|
pass
|