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werkzeug.security
~~~~~~~~~~~~~~~~~
Security related helpers such as secure password hashing tools.
:copyright: 2007 Pallets
:license: BSD-3-Clause
i����N( t SystemRandom( t Structi ( t izip( t PY2( t
range_type( t text_type( t to_bytes( t to_nativet> abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789i�I s >It compare_digestc c s! | ] } | d k r | Vq d S( t /N( NR
( t None( t .0t sep( ( s5 /tmp/pip-install-sTXtzD/Werkzeug/werkzeug/security.pys <genexpr>! s c C s. t | | | | | � } t t j | d � � S( s) Like :func:`pbkdf2_bin`, but returns a hex-encoded string.
.. versionadded:: 0.9
:param data: the data to derive.
:param salt: the salt for the derivation.
:param iterations: the number of iterations.
:param keylen: the length of the resulting key. If not provided,
the digest size will be used.
:param hashfunc: the hash function to use. This can either be the
string name of a known hash function, or a function
from the hashlib module. Defaults to sha256.
t hex_codec( t
pbkdf2_binR t codecst encode( t datat saltt
iterationst keylent hashfunct rv( ( s5 /tmp/pip-install-sTXtzD/Werkzeug/werkzeug/security.pyt
pbkdf2_hex% s c C sp | s d } n t | � } t | � } t | � rQ | � } t | d d � } n | } t j | | | | | � S( s� Returns a binary digest for the PBKDF2 hash algorithm of `data`
with the given `salt`. It iterates `iterations` times and produces a
key of `keylen` bytes. By default, SHA-256 is used as hash function;
a different hashlib `hashfunc` can be provided.
.. versionadded:: 0.9
:param data: the data to derive.
:param salt: the salt for the derivation.
:param iterations: the number of iterations.
:param keylen: the length of the resulting key. If not provided
the digest size will be used.
:param hashfunc: the hash function to use. This can either be the
string name of a known hash function or a function
from the hashlib module. Defaults to sha256.
t sha256t nameN( R t callablet getattrR t hashlibt pbkdf2_hmac( R R R R R t
_test_hasht hash_name( ( s5 /tmp/pip-install-sTXtzD/Werkzeug/werkzeug/security.pyR 9 s c C s� t | t � r! | j d � } n t | t � rB | j d � } n t d k r[ t | | � St | � t | � k rw t Sd } t r� xh t | | � D]& \ } } | t | � t | � AO} q� Wn. x+ t | | � D] \ } } | | | AO} q� W| d k S( s� This function compares strings in somewhat constant time. This
requires that the length of at least one string is known in advance.
Returns `True` if the two strings are equal, or `False` if they are not.
.. versionadded:: 0.7
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isinstanceR R t _builtin_safe_str_cmpR t lent FalseR R t ord( t at bR t xt y( ( s5 /tmp/pip-install-sTXtzD/Werkzeug/werkzeug/security.pyt safe_str_cmpZ s
! c C s8 | d k r t d � � n d j d � t | � D� � S( sA Generate a random string of SALT_CHARS with specified ``length``.i s Salt length must be positivet c s s | ] } t j t � Vq d S( N( t _sys_rngt choicet
SALT_CHARS( R t _( ( s5 /tmp/pip-install-sTXtzD/Werkzeug/werkzeug/security.pys <genexpr>| s ( t
ValueErrort joinR ( t length( ( s5 /tmp/pip-install-sTXtzD/Werkzeug/werkzeug/security.pyt gen_saltx s c C sp | d k r | | f St | t � r7 | j d � } n | j d � r� | d j d � } t | � d
k rz t d � � n | j d � } | r� t | d p� d � p� t } t
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| | | � } | j � } n t j | | � j � } | | f S( s� Internal password hash helper. Supports plaintext without salt,
unsalted and salted passwords. In case salted passwords are used
hmac is used.
t plains utf-8s pbkdf2:i t :i i s& Invalid number of arguments for PBKDF2i s pbkdf2:%s:%ds Salt is required for PBKDF2R ( i i ( R! R R t
startswitht splitR# R0 t popt intt DEFAULT_PBKDF2_ITERATIONSt TrueR$ R t _create_mact hexdigestR t new( t methodR t passwordt argsR t is_pbkdf2t
actual_methodR t mac( ( s5 /tmp/pip-install-sTXtzD/Werkzeug/werkzeug/security.pyt _hash_internal s2
"c sM t � � r t j | | � � Sd � f d � } | | _ t j | | | � S( NR+ c s t j � | � S( N( R R> ( t d( R? ( s5 /tmp/pip-install-sTXtzD/Werkzeug/werkzeug/security.pyR � s ( R t hmact HMACt __call__( t keyt msgR? R ( ( R? s5 /tmp/pip-install-sTXtzD/Werkzeug/werkzeug/security.pyR< � s
s
pbkdf2:sha256i c C sG | d k r t | � n d } t | | | � \ } } d | | | f S( s� Hash a password with the given method and salt with a string of
the given length. The format of the string returned includes the method
that was used so that :func:`check_password_hash` can check the hash.
The format for the hashed string looks like this::
method$salt$hash
This method can **not** generate unsalted passwords but it is possible
to set param method='plain' in order to enforce plaintext passwords.
If a salt is used, hmac is used internally to salt the password.
If PBKDF2 is wanted it can be enabled by setting the method to
``pbkdf2:method:iterations`` where iterations is optional::
pbkdf2:sha256:80000$salt$hash
pbkdf2:sha256$salt$hash
:param password: the password to hash.
:param method: the hash method to use (one that hashlib supports). Can
optionally be in the format ``pbkdf2:<method>[:iterations]``
to enable PBKDF2.
:param salt_length: the length of the salt in letters.
R4 R+ s %s$%s$%s( R3 RE ( R@ R? t salt_lengthR t hRC ( ( s5 /tmp/pip-install-sTXtzD/Werkzeug/werkzeug/security.pyt generate_password_hash� s c C sQ | j d � d k r t S| j d d � \ } } } t t | | | � d | � S( s� check a password against a given salted and hashed password value.
In order to support unsalted legacy passwords this method supports
plain text passwords, md5 and sha1 hashes (both salted and unsalted).
Returns `True` if the password matched, `False` otherwise.
:param pwhash: a hashed string like returned by
:func:`generate_password_hash`.
:param password: the plaintext password to compare against the hash.
t $i i ( t countR$ R7 R* RE ( t pwhashR@ R? R t hashval( ( s5 /tmp/pip-install-sTXtzD/Werkzeug/werkzeug/security.pyt check_password_hash� s c s� | g } x� | D]~ � � d k r4 t j � � � n t � f d � t D� � s} t j j � � s} � d k s} � j d � r� d S| j � � q Wt j
| � S( s2 Safely join zero or more untrusted path components to a base
directory to avoid escaping the base directory.
:param directory: The trusted base directory.
:param pathnames: The untrusted path components relative to the
base directory.
:return: A safe path, otherwise ``None``.
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( t filename( s5 /tmp/pip-install-sTXtzD/Werkzeug/werkzeug/security.pys <genexpr>� s s ..s ../N( t posixpatht normpatht anyt _os_alt_sepst ost patht isabsR6 R t appendR1 ( t directoryt pathnamest parts( ( RT s5 /tmp/pip-install-sTXtzD/Werkzeug/werkzeug/security.pyt safe_join� s
(' t __doc__R R RG RY RU t randomR t structR t _compatR R R R R R R. R: t packt _pack_intR R R" R, t listRZ R
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