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245 lines
8.3 KiB
245 lines
8.3 KiB
3 years ago
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"""passlib.handlers.mssql - MS-SQL Password Hash
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Notes
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=====
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MS-SQL has used a number of hash algs over the years,
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most of which were exposed through the undocumented
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'pwdencrypt' and 'pwdcompare' sql functions.
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Known formats
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-------------
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6.5
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snefru hash, ascii encoded password
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no examples found
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7.0
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snefru hash, unicode (what encoding?)
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saw ref that these blobs were 16 bytes in size
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no examples found
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2000
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byte string using displayed as 0x hex, using 0x0100 prefix.
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contains hashes of password and upper-case password.
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2007
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same as 2000, but without the upper-case hash.
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refs
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----------
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https://blogs.msdn.com/b/lcris/archive/2007/04/30/sql-server-2005-about-login-password-hashes.aspx?Redirected=true
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http://us.generation-nt.com/securing-passwords-hash-help-35429432.html
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http://forum.md5decrypter.co.uk/topic230-mysql-and-mssql-get-password-hashes.aspx
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http://www.theregister.co.uk/2002/07/08/cracking_ms_sql_server_passwords/
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"""
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#=============================================================================
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# imports
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#=============================================================================
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# core
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from binascii import hexlify, unhexlify
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from hashlib import sha1
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import re
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import logging; log = logging.getLogger(__name__)
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from warnings import warn
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# site
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# pkg
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from passlib.utils import consteq
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from passlib.utils.compat import bascii_to_str, unicode, u
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import passlib.utils.handlers as uh
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# local
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__all__ = [
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"mssql2000",
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"mssql2005",
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]
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#=============================================================================
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# mssql 2000
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#=============================================================================
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def _raw_mssql(secret, salt):
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assert isinstance(secret, unicode)
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assert isinstance(salt, bytes)
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return sha1(secret.encode("utf-16-le") + salt).digest()
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BIDENT = b"0x0100"
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##BIDENT2 = b("\x01\x00")
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UIDENT = u("0x0100")
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def _ident_mssql(hash, csize, bsize):
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"""common identify for mssql 2000/2005"""
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if isinstance(hash, unicode):
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if len(hash) == csize and hash.startswith(UIDENT):
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return True
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elif isinstance(hash, bytes):
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if len(hash) == csize and hash.startswith(BIDENT):
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return True
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##elif len(hash) == bsize and hash.startswith(BIDENT2): # raw bytes
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## return True
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else:
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raise uh.exc.ExpectedStringError(hash, "hash")
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return False
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def _parse_mssql(hash, csize, bsize, handler):
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"""common parser for mssql 2000/2005; returns 4 byte salt + checksum"""
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if isinstance(hash, unicode):
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if len(hash) == csize and hash.startswith(UIDENT):
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try:
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return unhexlify(hash[6:].encode("utf-8"))
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except TypeError: # throw when bad char found
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pass
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elif isinstance(hash, bytes):
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# assumes ascii-compat encoding
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assert isinstance(hash, bytes)
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if len(hash) == csize and hash.startswith(BIDENT):
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try:
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return unhexlify(hash[6:])
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except TypeError: # throw when bad char found
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pass
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##elif len(hash) == bsize and hash.startswith(BIDENT2): # raw bytes
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## return hash[2:]
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else:
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raise uh.exc.ExpectedStringError(hash, "hash")
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raise uh.exc.InvalidHashError(handler)
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class mssql2000(uh.HasRawSalt, uh.HasRawChecksum, uh.GenericHandler):
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"""This class implements the password hash used by MS-SQL 2000, and follows the :ref:`password-hash-api`.
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It supports a fixed-length salt.
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The :meth:`~passlib.ifc.PasswordHash.using` method accepts the following optional keywords:
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:type salt: bytes
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:param salt:
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Optional salt string.
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If not specified, one will be autogenerated (this is recommended).
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If specified, it must be 4 bytes in length.
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:type relaxed: bool
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:param relaxed:
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By default, providing an invalid value for one of the other
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keywords will result in a :exc:`ValueError`. If ``relaxed=True``,
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and the error can be corrected, a :exc:`~passlib.exc.PasslibHashWarning`
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will be issued instead. Correctable errors include
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``salt`` strings that are too long.
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"""
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#===================================================================
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# algorithm information
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#===================================================================
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name = "mssql2000"
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setting_kwds = ("salt",)
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checksum_size = 40
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min_salt_size = max_salt_size = 4
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#===================================================================
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# formatting
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#===================================================================
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# 0100 - 2 byte identifier
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# 4 byte salt
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# 20 byte checksum
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# 20 byte checksum
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# = 46 bytes
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# encoded '0x' + 92 chars = 94
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@classmethod
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def identify(cls, hash):
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return _ident_mssql(hash, 94, 46)
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@classmethod
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def from_string(cls, hash):
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data = _parse_mssql(hash, 94, 46, cls)
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return cls(salt=data[:4], checksum=data[4:])
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def to_string(self):
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raw = self.salt + self.checksum
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# raw bytes format - BIDENT2 + raw
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return "0x0100" + bascii_to_str(hexlify(raw).upper())
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def _calc_checksum(self, secret):
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if isinstance(secret, bytes):
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secret = secret.decode("utf-8")
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salt = self.salt
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return _raw_mssql(secret, salt) + _raw_mssql(secret.upper(), salt)
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@classmethod
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def verify(cls, secret, hash):
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# NOTE: we only compare against the upper-case hash
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# XXX: add 'full' just to verify both checksums?
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uh.validate_secret(secret)
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self = cls.from_string(hash)
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chk = self.checksum
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if chk is None:
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raise uh.exc.MissingDigestError(cls)
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if isinstance(secret, bytes):
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secret = secret.decode("utf-8")
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result = _raw_mssql(secret.upper(), self.salt)
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return consteq(result, chk[20:])
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#=============================================================================
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# handler
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#=============================================================================
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class mssql2005(uh.HasRawSalt, uh.HasRawChecksum, uh.GenericHandler):
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"""This class implements the password hash used by MS-SQL 2005, and follows the :ref:`password-hash-api`.
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It supports a fixed-length salt.
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The :meth:`~passlib.ifc.PasswordHash.using` method accepts the following optional keywords:
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:type salt: bytes
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:param salt:
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Optional salt string.
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If not specified, one will be autogenerated (this is recommended).
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If specified, it must be 4 bytes in length.
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:type relaxed: bool
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:param relaxed:
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By default, providing an invalid value for one of the other
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keywords will result in a :exc:`ValueError`. If ``relaxed=True``,
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and the error can be corrected, a :exc:`~passlib.exc.PasslibHashWarning`
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will be issued instead. Correctable errors include
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``salt`` strings that are too long.
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"""
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#===================================================================
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# algorithm information
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#===================================================================
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name = "mssql2005"
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setting_kwds = ("salt",)
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checksum_size = 20
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min_salt_size = max_salt_size = 4
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#===================================================================
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# formatting
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#===================================================================
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# 0x0100 - 2 byte identifier
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# 4 byte salt
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# 20 byte checksum
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# = 26 bytes
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# encoded '0x' + 52 chars = 54
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@classmethod
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def identify(cls, hash):
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return _ident_mssql(hash, 54, 26)
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@classmethod
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def from_string(cls, hash):
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data = _parse_mssql(hash, 54, 26, cls)
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return cls(salt=data[:4], checksum=data[4:])
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def to_string(self):
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raw = self.salt + self.checksum
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# raw bytes format - BIDENT2 + raw
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return "0x0100" + bascii_to_str(hexlify(raw)).upper()
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def _calc_checksum(self, secret):
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if isinstance(secret, bytes):
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secret = secret.decode("utf-8")
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return _raw_mssql(secret, self.salt)
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#===================================================================
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# eoc
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#===================================================================
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#=============================================================================
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# eof
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#=============================================================================
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