mirror of
https://github.com/janeczku/calibre-web
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bbf6d9b026
Bugfix for feeds
- removed categories related and up
- load new books now working
- category random now working
login page is free of non accessible elements
boolean custom column is vivible in UI
books with only with certain languages can be shown
book shelfs can be deleted from UI
Anonymous user view is more resticted
Added browse of series in sidebar
Dependencys in vendor folder are updated to newer versions (licencs files are now present)
Bugfix editing Authors names
Made upload on windows working
265 lines
8.8 KiB
Python
265 lines
8.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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werkzeug.security
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~~~~~~~~~~~~~~~~~
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Security related helpers such as secure password hashing tools.
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:copyright: (c) 2014 by the Werkzeug Team, see AUTHORS for more details.
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:license: BSD, see LICENSE for more details.
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"""
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import os
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import hmac
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import hashlib
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import posixpath
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import codecs
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from struct import Struct
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from random import SystemRandom
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from operator import xor
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from itertools import starmap
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from werkzeug._compat import range_type, PY2, text_type, izip, to_bytes, \
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string_types, to_native
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SALT_CHARS = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
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DEFAULT_PBKDF2_ITERATIONS = 1000
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_pack_int = Struct('>I').pack
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_builtin_safe_str_cmp = getattr(hmac, 'compare_digest', None)
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_sys_rng = SystemRandom()
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_os_alt_seps = list(sep for sep in [os.path.sep, os.path.altsep]
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if sep not in (None, '/'))
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def _find_hashlib_algorithms():
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algos = getattr(hashlib, 'algorithms', None)
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if algos is None:
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algos = ('md5', 'sha1', 'sha224', 'sha256', 'sha384', 'sha512')
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rv = {}
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for algo in algos:
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func = getattr(hashlib, algo, None)
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if func is not None:
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rv[algo] = func
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return rv
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_hash_funcs = _find_hashlib_algorithms()
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def pbkdf2_hex(data, salt, iterations=DEFAULT_PBKDF2_ITERATIONS,
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keylen=None, hashfunc=None):
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"""Like :func:`pbkdf2_bin`, but returns a hex-encoded string.
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.. versionadded:: 0.9
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:param data: the data to derive.
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:param salt: the salt for the derivation.
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:param iterations: the number of iterations.
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:param keylen: the length of the resulting key. If not provided,
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the digest size will be used.
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:param hashfunc: the hash function to use. This can either be the
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string name of a known hash function, or a function
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from the hashlib module. Defaults to sha1.
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"""
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rv = pbkdf2_bin(data, salt, iterations, keylen, hashfunc)
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return to_native(codecs.encode(rv, 'hex_codec'))
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_has_native_pbkdf2 = hasattr(hashlib, 'pbkdf2_hmac')
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def pbkdf2_bin(data, salt, iterations=DEFAULT_PBKDF2_ITERATIONS,
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keylen=None, hashfunc=None):
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"""Returns a binary digest for the PBKDF2 hash algorithm of `data`
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with the given `salt`. It iterates `iterations` times and produces a
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key of `keylen` bytes. By default, SHA-1 is used as hash function;
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a different hashlib `hashfunc` can be provided.
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.. versionadded:: 0.9
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:param data: the data to derive.
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:param salt: the salt for the derivation.
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:param iterations: the number of iterations.
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:param keylen: the length of the resulting key. If not provided
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the digest size will be used.
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:param hashfunc: the hash function to use. This can either be the
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string name of a known hash function or a function
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from the hashlib module. Defaults to sha1.
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"""
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if isinstance(hashfunc, string_types):
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hashfunc = _hash_funcs[hashfunc]
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elif not hashfunc:
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hashfunc = hashlib.sha1
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data = to_bytes(data)
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salt = to_bytes(salt)
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# If we're on Python with pbkdf2_hmac we can try to use it for
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# compatible digests.
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if _has_native_pbkdf2:
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_test_hash = hashfunc()
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if hasattr(_test_hash, 'name') and \
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_test_hash.name in _hash_funcs:
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return hashlib.pbkdf2_hmac(_test_hash.name,
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data, salt, iterations,
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keylen)
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mac = hmac.HMAC(data, None, hashfunc)
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if not keylen:
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keylen = mac.digest_size
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def _pseudorandom(x, mac=mac):
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h = mac.copy()
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h.update(x)
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return bytearray(h.digest())
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buf = bytearray()
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for block in range_type(1, -(-keylen // mac.digest_size) + 1):
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rv = u = _pseudorandom(salt + _pack_int(block))
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for i in range_type(iterations - 1):
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u = _pseudorandom(bytes(u))
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rv = bytearray(starmap(xor, izip(rv, u)))
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buf.extend(rv)
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return bytes(buf[:keylen])
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def safe_str_cmp(a, b):
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"""This function compares strings in somewhat constant time. This
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requires that the length of at least one string is known in advance.
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Returns `True` if the two strings are equal, or `False` if they are not.
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.. versionadded:: 0.7
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"""
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if isinstance(a, text_type):
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a = a.encode('utf-8')
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if isinstance(b, text_type):
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b = b.encode('utf-8')
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if _builtin_safe_str_cmp is not None:
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return _builtin_safe_str_cmp(a, b)
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if len(a) != len(b):
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return False
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rv = 0
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if PY2:
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for x, y in izip(a, b):
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rv |= ord(x) ^ ord(y)
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else:
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for x, y in izip(a, b):
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rv |= x ^ y
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return rv == 0
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def gen_salt(length):
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"""Generate a random string of SALT_CHARS with specified ``length``."""
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if length <= 0:
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raise ValueError('Salt length must be positive')
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return ''.join(_sys_rng.choice(SALT_CHARS) for _ in range_type(length))
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def _hash_internal(method, salt, password):
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"""Internal password hash helper. Supports plaintext without salt,
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unsalted and salted passwords. In case salted passwords are used
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hmac is used.
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"""
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if method == 'plain':
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return password, method
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if isinstance(password, text_type):
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password = password.encode('utf-8')
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if method.startswith('pbkdf2:'):
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args = method[7:].split(':')
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if len(args) not in (1, 2):
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raise ValueError('Invalid number of arguments for PBKDF2')
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method = args.pop(0)
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iterations = args and int(args[0] or 0) or DEFAULT_PBKDF2_ITERATIONS
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is_pbkdf2 = True
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actual_method = 'pbkdf2:%s:%d' % (method, iterations)
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else:
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is_pbkdf2 = False
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actual_method = method
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hash_func = _hash_funcs.get(method)
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if hash_func is None:
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raise TypeError('invalid method %r' % method)
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if is_pbkdf2:
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if not salt:
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raise ValueError('Salt is required for PBKDF2')
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rv = pbkdf2_hex(password, salt, iterations,
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hashfunc=hash_func)
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elif salt:
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if isinstance(salt, text_type):
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salt = salt.encode('utf-8')
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rv = hmac.HMAC(salt, password, hash_func).hexdigest()
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else:
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h = hash_func()
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h.update(password)
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rv = h.hexdigest()
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return rv, actual_method
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def generate_password_hash(password, method='pbkdf2:sha1', salt_length=8):
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"""Hash a password with the given method and salt with with a string of
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the given length. The format of the string returned includes the method
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that was used so that :func:`check_password_hash` can check the hash.
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The format for the hashed string looks like this::
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method$salt$hash
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This method can **not** generate unsalted passwords but it is possible
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to set the method to plain to enforce plaintext passwords. If a salt
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is used, hmac is used internally to salt the password.
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If PBKDF2 is wanted it can be enabled by setting the method to
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``pbkdf2:method:iterations`` where iterations is optional::
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pbkdf2:sha1:2000$salt$hash
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pbkdf2:sha1$salt$hash
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:param password: the password to hash.
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:param method: the hash method to use (one that hashlib supports). Can
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optionally be in the format ``pbkdf2:<method>[:iterations]``
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to enable PBKDF2.
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:param salt_length: the length of the salt in letters.
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"""
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salt = method != 'plain' and gen_salt(salt_length) or ''
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h, actual_method = _hash_internal(method, salt, password)
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return '%s$%s$%s' % (actual_method, salt, h)
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def check_password_hash(pwhash, password):
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"""check a password against a given salted and hashed password value.
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In order to support unsalted legacy passwords this method supports
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plain text passwords, md5 and sha1 hashes (both salted and unsalted).
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Returns `True` if the password matched, `False` otherwise.
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:param pwhash: a hashed string like returned by
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:func:`generate_password_hash`.
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:param password: the plaintext password to compare against the hash.
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"""
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if pwhash.count('$') < 2:
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return False
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method, salt, hashval = pwhash.split('$', 2)
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return safe_str_cmp(_hash_internal(method, salt, password)[0], hashval)
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def safe_join(directory, filename):
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"""Safely join `directory` and `filename`. If this cannot be done,
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this function returns ``None``.
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:param directory: the base directory.
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:param filename: the untrusted filename relative to that directory.
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"""
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filename = posixpath.normpath(filename)
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for sep in _os_alt_seps:
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if sep in filename:
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return None
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if os.path.isabs(filename) or filename.startswith('../'):
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return None
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return os.path.join(directory, filename)
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