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"""passlib.handlers.django- Django password hash support"""
#=============================================================================
# imports
#=============================================================================
# core
from base64 import b64encode
from binascii import hexlify
from hashlib import md5, sha1, sha256
import logging; log = logging.getLogger(__name__)
# site
# pkg
from passlib.handlers.bcrypt import _wrapped_bcrypt
from passlib.hash import argon2, bcrypt, pbkdf2_sha1, pbkdf2_sha256
from passlib.utils import to_unicode, rng, getrandstr
from passlib.utils.binary import BASE64_CHARS
from passlib.utils.compat import str_to_uascii, uascii_to_str, unicode, u
from passlib.crypto.digest import pbkdf2_hmac
import passlib.utils.handlers as uh
# local
__all__ = [
"django_salted_sha1",
"django_salted_md5",
"django_bcrypt",
"django_pbkdf2_sha1",
"django_pbkdf2_sha256",
"django_argon2",
"django_des_crypt",
"django_disabled",
]
#=============================================================================
# lazy imports & constants
#=============================================================================
# imported by django_des_crypt._calc_checksum()
des_crypt = None
def _import_des_crypt():
global des_crypt
if des_crypt is None:
from passlib.hash import des_crypt
return des_crypt
# django 1.4's salt charset
SALT_CHARS = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
#=============================================================================
# salted hashes
#=============================================================================
class DjangoSaltedHash(uh.HasSalt, uh.GenericHandler):
"""base class providing common code for django hashes"""
# name, ident, checksum_size must be set by subclass.
# ident must include "$" suffix.
setting_kwds = ("salt", "salt_size")
# NOTE: django 1.0-1.3 would accept empty salt strings.
# django 1.4 won't, but this appears to be regression
# (https://code.djangoproject.com/ticket/18144)
# so presumably it will be fixed in a later release.
default_salt_size = 12
max_salt_size = None
salt_chars = SALT_CHARS
checksum_chars = uh.LOWER_HEX_CHARS
@classmethod
def from_string(cls, hash):
salt, chk = uh.parse_mc2(hash, cls.ident, handler=cls)
return cls(salt=salt, checksum=chk)
def to_string(self):
return uh.render_mc2(self.ident, self.salt, self.checksum)
# NOTE: only used by PBKDF2
class DjangoVariableHash(uh.HasRounds, DjangoSaltedHash):
"""base class providing common code for django hashes w/ variable rounds"""
setting_kwds = DjangoSaltedHash.setting_kwds + ("rounds",)
min_rounds = 1
@classmethod
def from_string(cls, hash):
rounds, salt, chk = uh.parse_mc3(hash, cls.ident, handler=cls)
return cls(rounds=rounds, salt=salt, checksum=chk)
def to_string(self):
return uh.render_mc3(self.ident, self.rounds, self.salt, self.checksum)
class django_salted_sha1(DjangoSaltedHash):
"""This class implements Django's Salted SHA1 hash, and follows the :ref:`password-hash-api`.
It supports a variable-length salt, and uses a single round of SHA1.
The :meth:`~passlib.ifc.PasswordHash.hash` and :meth:`~passlib.ifc.PasswordHash.genconfig` methods accept the following optional keywords:
:type salt: str
:param salt:
Optional salt string.
If not specified, a 12 character one will be autogenerated (this is recommended).
If specified, may be any series of characters drawn from the regexp range ``[0-9a-zA-Z]``.
:type salt_size: int
:param salt_size:
Optional number of characters to use when autogenerating new salts.
Defaults to 12, but can be any positive value.
This should be compatible with Django 1.4's :class:`!SHA1PasswordHasher` class.
.. versionchanged: 1.6
This class now generates 12-character salts instead of 5,
and generated salts uses the character range ``[0-9a-zA-Z]`` instead of
the ``[0-9a-f]``. This is to be compatible with how Django >= 1.4
generates these hashes; but hashes generated in this manner will still be
correctly interpreted by earlier versions of Django.
"""
name = "django_salted_sha1"
django_name = "sha1"
ident = u("sha1$")
checksum_size = 40
def _calc_checksum(self, secret):
if isinstance(secret, unicode):
secret = secret.encode("utf-8")
return str_to_uascii(sha1(self.salt.encode("ascii") + secret).hexdigest())
class django_salted_md5(DjangoSaltedHash):
"""This class implements Django's Salted MD5 hash, and follows the :ref:`password-hash-api`.
It supports a variable-length salt, and uses a single round of MD5.
The :meth:`~passlib.ifc.PasswordHash.hash` and :meth:`~passlib.ifc.PasswordHash.genconfig` methods accept the following optional keywords:
:type salt: str
:param salt:
Optional salt string.
If not specified, a 12 character one will be autogenerated (this is recommended).
If specified, may be any series of characters drawn from the regexp range ``[0-9a-zA-Z]``.
:type salt_size: int
:param salt_size:
Optional number of characters to use when autogenerating new salts.
Defaults to 12, but can be any positive value.
This should be compatible with the hashes generated by
Django 1.4's :class:`!MD5PasswordHasher` class.
.. versionchanged: 1.6
This class now generates 12-character salts instead of 5,
and generated salts uses the character range ``[0-9a-zA-Z]`` instead of
the ``[0-9a-f]``. This is to be compatible with how Django >= 1.4
generates these hashes; but hashes generated in this manner will still be
correctly interpreted by earlier versions of Django.
"""
name = "django_salted_md5"
django_name = "md5"
ident = u("md5$")
checksum_size = 32
def _calc_checksum(self, secret):
if isinstance(secret, unicode):
secret = secret.encode("utf-8")
return str_to_uascii(md5(self.salt.encode("ascii") + secret).hexdigest())
#=============================================================================
# BCrypt
#=============================================================================
django_bcrypt = uh.PrefixWrapper("django_bcrypt", bcrypt,
prefix=u('bcrypt$'), ident=u("bcrypt$"),
# NOTE: this docstring is duplicated in the docs, since sphinx
# seems to be having trouble reading it via autodata::
doc="""This class implements Django 1.4's BCrypt wrapper, and follows the :ref:`password-hash-api`.
This is identical to :class:`!bcrypt` itself, but with
the Django-specific prefix ``"bcrypt$"`` prepended.
See :doc:`/lib/passlib.hash.bcrypt` for more details,
the usage and behavior is identical.
This should be compatible with the hashes generated by
Django 1.4's :class:`!BCryptPasswordHasher` class.
.. versionadded:: 1.6
""")
django_bcrypt.django_name = "bcrypt"
django_bcrypt._using_clone_attrs += ("django_name",)
#=============================================================================
# BCRYPT + SHA256
#=============================================================================
class django_bcrypt_sha256(_wrapped_bcrypt):
"""This class implements Django 1.6's Bcrypt+SHA256 hash, and follows the :ref:`password-hash-api`.
It supports a variable-length salt, and a variable number of rounds.
While the algorithm and format is somewhat different,
the api and options for this hash are identical to :class:`!bcrypt` itself,
see :doc:`bcrypt </lib/passlib.hash.bcrypt>` for more details.
.. versionadded:: 1.6.2
"""
name = "django_bcrypt_sha256"
django_name = "bcrypt_sha256"
_digest = sha256
# sample hash:
# bcrypt_sha256$$2a$06$/3OeRpbOf8/l6nPPRdZPp.nRiyYqPobEZGdNRBWihQhiFDh1ws1tu
# XXX: we can't use .ident attr due to bcrypt code using it.
# working around that via django_prefix
django_prefix = u('bcrypt_sha256$')
@classmethod
def identify(cls, hash):
hash = uh.to_unicode_for_identify(hash)
if not hash:
return False
return hash.startswith(cls.django_prefix)
@classmethod
def from_string(cls, hash):
hash = to_unicode(hash, "ascii", "hash")
if not hash.startswith(cls.django_prefix):
raise uh.exc.InvalidHashError(cls)
bhash = hash[len(cls.django_prefix):]
if not bhash.startswith("$2"):
raise uh.exc.MalformedHashError(cls)
return super(django_bcrypt_sha256, cls).from_string(bhash)
def to_string(self):
bhash = super(django_bcrypt_sha256, self).to_string()
return uascii_to_str(self.django_prefix) + bhash
def _calc_checksum(self, secret):
if isinstance(secret, unicode):
secret = secret.encode("utf-8")
secret = hexlify(self._digest(secret).digest())
return super(django_bcrypt_sha256, self)._calc_checksum(secret)
#=============================================================================
# PBKDF2 variants
#=============================================================================
class django_pbkdf2_sha256(DjangoVariableHash):
"""This class implements Django's PBKDF2-HMAC-SHA256 hash, and follows the :ref:`password-hash-api`.
It supports a variable-length salt, and a variable number of rounds.
The :meth:`~passlib.ifc.PasswordHash.using` method accepts the following optional keywords:
:type salt: str
:param salt:
Optional salt string.
If not specified, a 12 character one will be autogenerated (this is recommended).
If specified, may be any series of characters drawn from the regexp range ``[0-9a-zA-Z]``.
:type salt_size: int
:param salt_size:
Optional number of characters to use when autogenerating new salts.
Defaults to 12, but can be any positive value.
:type rounds: int
:param rounds:
Optional number of rounds to use.
Defaults to 29000, but must be within ``range(1,1<<32)``.
:type relaxed: bool
:param relaxed:
By default, providing an invalid value for one of the other
keywords will result in a :exc:`ValueError`. If ``relaxed=True``,
and the error can be corrected, a :exc:`~passlib.exc.PasslibHashWarning`
will be issued instead. Correctable errors include ``rounds``
that are too small or too large, and ``salt`` strings that are too long.
This should be compatible with the hashes generated by
Django 1.4's :class:`!PBKDF2PasswordHasher` class.
.. versionadded:: 1.6
"""
name = "django_pbkdf2_sha256"
django_name = "pbkdf2_sha256"
ident = u('pbkdf2_sha256$')
min_salt_size = 1
max_rounds = 0xffffffff # setting at 32-bit limit for now
checksum_chars = uh.PADDED_BASE64_CHARS
checksum_size = 44 # 32 bytes -> base64
default_rounds = pbkdf2_sha256.default_rounds # NOTE: django 1.6 uses 12000
_digest = "sha256"
def _calc_checksum(self, secret):
# NOTE: secret & salt will be encoded using UTF-8 by pbkdf2_hmac()
hash = pbkdf2_hmac(self._digest, secret, self.salt, self.rounds)
return b64encode(hash).rstrip().decode("ascii")
class django_pbkdf2_sha1(django_pbkdf2_sha256):
"""This class implements Django's PBKDF2-HMAC-SHA1 hash, and follows the :ref:`password-hash-api`.
It supports a variable-length salt, and a variable number of rounds.
The :meth:`~passlib.ifc.PasswordHash.using` method accepts the following optional keywords:
:type salt: str
:param salt:
Optional salt string.
If not specified, a 12 character one will be autogenerated (this is recommended).
If specified, may be any series of characters drawn from the regexp range ``[0-9a-zA-Z]``.
:type salt_size: int
:param salt_size:
Optional number of characters to use when autogenerating new salts.
Defaults to 12, but can be any positive value.
:type rounds: int
:param rounds:
Optional number of rounds to use.
Defaults to 131000, but must be within ``range(1,1<<32)``.
:type relaxed: bool
:param relaxed:
By default, providing an invalid value for one of the other
keywords will result in a :exc:`ValueError`. If ``relaxed=True``,
and the error can be corrected, a :exc:`~passlib.exc.PasslibHashWarning`
will be issued instead. Correctable errors include ``rounds``
that are too small or too large, and ``salt`` strings that are too long.
This should be compatible with the hashes generated by
Django 1.4's :class:`!PBKDF2SHA1PasswordHasher` class.
.. versionadded:: 1.6
"""
name = "django_pbkdf2_sha1"
django_name = "pbkdf2_sha1"
ident = u('pbkdf2_sha1$')
checksum_size = 28 # 20 bytes -> base64
default_rounds = pbkdf2_sha1.default_rounds # NOTE: django 1.6 uses 12000
_digest = "sha1"
#=============================================================================
# Argon2
#=============================================================================
# NOTE: as of 2019-11-11, Django's Argon2PasswordHasher only supports Type I;
# so limiting this to ensure that as well.
django_argon2 = uh.PrefixWrapper(
name="django_argon2",
wrapped=argon2.using(type="I"),
prefix=u('argon2'),
ident=u('argon2$argon2i$'),
# NOTE: this docstring is duplicated in the docs, since sphinx
# seems to be having trouble reading it via autodata::
doc="""This class implements Django 1.10's Argon2 wrapper, and follows the :ref:`password-hash-api`.
This is identical to :class:`!argon2` itself, but with
the Django-specific prefix ``"argon2$"`` prepended.
See :doc:`argon2 </lib/passlib.hash.argon2>` for more details,
the usage and behavior is identical.
This should be compatible with the hashes generated by
Django 1.10's :class:`!Argon2PasswordHasher` class.
.. versionadded:: 1.7
""")
django_argon2.django_name = "argon2"
django_argon2._using_clone_attrs += ("django_name",)
#=============================================================================
# DES
#=============================================================================
class django_des_crypt(uh.TruncateMixin, uh.HasSalt, uh.GenericHandler):
"""This class implements Django's :class:`des_crypt` wrapper, and follows the :ref:`password-hash-api`.
It supports a fixed-length salt.
The :meth:`~passlib.ifc.PasswordHash.hash` and :meth:`~passlib.ifc.PasswordHash.genconfig` methods accept the following optional keywords:
:type salt: str
:param salt:
Optional salt string.
If not specified, one will be autogenerated (this is recommended).
If specified, it must be 2 characters, drawn from the regexp range ``[./0-9A-Za-z]``.
:param bool truncate_error:
By default, django_des_crypt will silently truncate passwords larger than 8 bytes.
Setting ``truncate_error=True`` will cause :meth:`~passlib.ifc.PasswordHash.hash`
to raise a :exc:`~passlib.exc.PasswordTruncateError` instead.
.. versionadded:: 1.7
This should be compatible with the hashes generated by
Django 1.4's :class:`!CryptPasswordHasher` class.
Note that Django only supports this hash on Unix systems
(though :class:`!django_des_crypt` is available cross-platform
under Passlib).
.. versionchanged:: 1.6
This class will now accept hashes with empty salt strings,
since Django 1.4 generates them this way.
"""
name = "django_des_crypt"
django_name = "crypt"
setting_kwds = ("salt", "salt_size", "truncate_error")
ident = u("crypt$")
checksum_chars = salt_chars = uh.HASH64_CHARS
checksum_size = 11
min_salt_size = default_salt_size = 2
truncate_size = 8
# NOTE: regarding duplicate salt field:
#
# django 1.0 had a "crypt$<salt1>$<salt2><digest>" hash format,
# used [a-z0-9] to generate a 5 char salt, stored it in salt1,
# duplicated the first two chars of salt1 as salt2.
# it would throw an error if salt1 was empty.
#
# django 1.4 started generating 2 char salt using the full alphabet,
# left salt1 empty, and only paid attention to salt2.
#
# in order to be compatible with django 1.0, the hashes generated
# by this function will always include salt1, unless the following
# class-level field is disabled (mainly used for testing)
use_duplicate_salt = True
@classmethod
def from_string(cls, hash):
salt, chk = uh.parse_mc2(hash, cls.ident, handler=cls)
if chk:
# chk should be full des_crypt hash
if not salt:
# django 1.4 always uses empty salt field,
# so extract salt from des_crypt hash <chk>
salt = chk[:2]
elif salt[:2] != chk[:2]:
# django 1.0 stored 5 chars in salt field, and duplicated
# the first two chars in <chk>. we keep the full salt,
# but make sure the first two chars match as sanity check.
raise uh.exc.MalformedHashError(cls,
"first two digits of salt and checksum must match")
# in all cases, strip salt chars from <chk>
chk = chk[2:]
return cls(salt=salt, checksum=chk)
def to_string(self):
salt = self.salt
chk = salt[:2] + self.checksum
if self.use_duplicate_salt:
# filling in salt field, so that we're compatible with django 1.0
return uh.render_mc2(self.ident, salt, chk)
else:
# django 1.4+ style hash
return uh.render_mc2(self.ident, "", chk)
def _calc_checksum(self, secret):
# NOTE: we lazily import des_crypt,
# since most django deploys won't use django_des_crypt
global des_crypt
if des_crypt is None:
_import_des_crypt()
# check for truncation (during .hash() calls only)
if self.use_defaults:
self._check_truncate_policy(secret)
return des_crypt(salt=self.salt[:2])._calc_checksum(secret)
class django_disabled(uh.ifc.DisabledHash, uh.StaticHandler):
"""This class provides disabled password behavior for Django, and follows the :ref:`password-hash-api`.
This class does not implement a hash, but instead
claims the special hash string ``"!"`` which Django uses
to indicate an account's password has been disabled.
* newly encrypted passwords will hash to ``"!"``.
* it rejects all passwords.
.. note::
Django 1.6 prepends a randomly generated 40-char alphanumeric string
to each unusuable password. This class recognizes such strings,
but for backwards compatibility, still returns ``"!"``.
See `<https://code.djangoproject.com/ticket/20079>`_ for why
Django appends an alphanumeric string.
.. versionchanged:: 1.6.2 added Django 1.6 support
.. versionchanged:: 1.7 started appending an alphanumeric string.
"""
name = "django_disabled"
_hash_prefix = u("!")
suffix_length = 40
# XXX: move this to StaticHandler, or wherever _hash_prefix is being used?
@classmethod
def identify(cls, hash):
hash = uh.to_unicode_for_identify(hash)
return hash.startswith(cls._hash_prefix)
def _calc_checksum(self, secret):
# generate random suffix to match django's behavior
return getrandstr(rng, BASE64_CHARS[:-2], self.suffix_length)
@classmethod
def verify(cls, secret, hash):
uh.validate_secret(secret)
if not cls.identify(hash):
raise uh.exc.InvalidHashError(cls)
return False
#=============================================================================
# eof
#=============================================================================