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==================================================================
:class:`passlib.hash.unix_disabled` - Unix Disabled Account Helper
==================================================================
.. currentmodule:: passlib.hash
This class does not provide an encryption scheme,
but instead provides a helper for handling disabled
password fields as found in unix ``/etc/shadow`` files.
Usage
=====
This class is mainly useful only for plugging into a
:class:`~passlib.context.CryptContext` instance.
It can be used directly as follows::
>>> from passlib.hash import unix_disabled as ud
>>> # 'encrypting' a password always results in "!" or "*"
>>> ud.encrypt("password")
'!'
>>> # verifying will fail for all passwords and hashes
>>> ud.verify("password", "!")
False
>>> ud.verify("letmein", "*NOPASSWORD*")
False
>>> # all strings are recognized - if used in conjunction with other hashes,
>>> # this should be the last one checked.
>>> ud.identify('!')
True
>>> ud.identify('*')
True
>>> ud.identify('')
True
Interface
=========
.. autoclass:: unix_disabled
Deviations
==========
According to the Linux ``shadow`` man page, an empty string is treated
as a wildcard by Linux, allowing all passwords. For security purposes,
this behavior is NOT supported; empty strings are treated the same as ``!``.
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