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
321 lines
11 KiB
Python
321 lines
11 KiB
Python
from __future__ import absolute_import
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import errno
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import warnings
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import hmac
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from binascii import hexlify, unhexlify
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from hashlib import md5, sha1, sha256
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from ..exceptions import SSLError, InsecurePlatformWarning, SNIMissingWarning
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SSLContext = None
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HAS_SNI = False
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create_default_context = None
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IS_PYOPENSSL = False
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# Maps the length of a digest to a possible hash function producing this digest
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HASHFUNC_MAP = {
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32: md5,
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40: sha1,
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64: sha256,
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}
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def _const_compare_digest_backport(a, b):
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"""
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Compare two digests of equal length in constant time.
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The digests must be of type str/bytes.
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Returns True if the digests match, and False otherwise.
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"""
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result = abs(len(a) - len(b))
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for l, r in zip(bytearray(a), bytearray(b)):
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result |= l ^ r
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return result == 0
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_const_compare_digest = getattr(hmac, 'compare_digest',
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_const_compare_digest_backport)
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try: # Test for SSL features
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import ssl
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from ssl import wrap_socket, CERT_NONE, PROTOCOL_SSLv23
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from ssl import HAS_SNI # Has SNI?
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except ImportError:
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pass
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try:
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from ssl import OP_NO_SSLv2, OP_NO_SSLv3, OP_NO_COMPRESSION
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except ImportError:
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OP_NO_SSLv2, OP_NO_SSLv3 = 0x1000000, 0x2000000
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OP_NO_COMPRESSION = 0x20000
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# A secure default.
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# Sources for more information on TLS ciphers:
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#
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# - https://wiki.mozilla.org/Security/Server_Side_TLS
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# - https://www.ssllabs.com/projects/best-practices/index.html
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# - https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
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#
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# The general intent is:
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# - Prefer cipher suites that offer perfect forward secrecy (DHE/ECDHE),
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# - prefer ECDHE over DHE for better performance,
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# - prefer any AES-GCM over any AES-CBC for better performance and security,
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# - use 3DES as fallback which is secure but slow,
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# - disable NULL authentication, MD5 MACs and DSS for security reasons.
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DEFAULT_CIPHERS = (
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'ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+HIGH:'
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'DH+HIGH:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+HIGH:RSA+3DES:!aNULL:'
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'!eNULL:!MD5'
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)
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try:
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from ssl import SSLContext # Modern SSL?
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except ImportError:
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import sys
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class SSLContext(object): # Platform-specific: Python 2 & 3.1
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supports_set_ciphers = ((2, 7) <= sys.version_info < (3,) or
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(3, 2) <= sys.version_info)
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def __init__(self, protocol_version):
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self.protocol = protocol_version
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# Use default values from a real SSLContext
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self.check_hostname = False
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self.verify_mode = ssl.CERT_NONE
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self.ca_certs = None
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self.options = 0
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self.certfile = None
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self.keyfile = None
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self.ciphers = None
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def load_cert_chain(self, certfile, keyfile):
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self.certfile = certfile
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self.keyfile = keyfile
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def load_verify_locations(self, cafile=None, capath=None):
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self.ca_certs = cafile
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if capath is not None:
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raise SSLError("CA directories not supported in older Pythons")
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def set_ciphers(self, cipher_suite):
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if not self.supports_set_ciphers:
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raise TypeError(
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'Your version of Python does not support setting '
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'a custom cipher suite. Please upgrade to Python '
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'2.7, 3.2, or later if you need this functionality.'
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)
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self.ciphers = cipher_suite
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def wrap_socket(self, socket, server_hostname=None, server_side=False):
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warnings.warn(
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'A true SSLContext object is not available. This prevents '
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'urllib3 from configuring SSL appropriately and may cause '
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'certain SSL connections to fail. You can upgrade to a newer '
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'version of Python to solve this. For more information, see '
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'https://urllib3.readthedocs.io/en/latest/security.html'
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'#insecureplatformwarning.',
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InsecurePlatformWarning
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)
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kwargs = {
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'keyfile': self.keyfile,
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'certfile': self.certfile,
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'ca_certs': self.ca_certs,
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'cert_reqs': self.verify_mode,
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'ssl_version': self.protocol,
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'server_side': server_side,
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}
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if self.supports_set_ciphers: # Platform-specific: Python 2.7+
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return wrap_socket(socket, ciphers=self.ciphers, **kwargs)
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else: # Platform-specific: Python 2.6
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return wrap_socket(socket, **kwargs)
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def assert_fingerprint(cert, fingerprint):
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"""
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Checks if given fingerprint matches the supplied certificate.
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:param cert:
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Certificate as bytes object.
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:param fingerprint:
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Fingerprint as string of hexdigits, can be interspersed by colons.
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"""
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fingerprint = fingerprint.replace(':', '').lower()
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digest_length = len(fingerprint)
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hashfunc = HASHFUNC_MAP.get(digest_length)
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if not hashfunc:
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raise SSLError(
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'Fingerprint of invalid length: {0}'.format(fingerprint))
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# We need encode() here for py32; works on py2 and p33.
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fingerprint_bytes = unhexlify(fingerprint.encode())
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cert_digest = hashfunc(cert).digest()
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if not _const_compare_digest(cert_digest, fingerprint_bytes):
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raise SSLError('Fingerprints did not match. Expected "{0}", got "{1}".'
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.format(fingerprint, hexlify(cert_digest)))
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def resolve_cert_reqs(candidate):
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"""
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Resolves the argument to a numeric constant, which can be passed to
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the wrap_socket function/method from the ssl module.
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Defaults to :data:`ssl.CERT_NONE`.
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If given a string it is assumed to be the name of the constant in the
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:mod:`ssl` module or its abbrevation.
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(So you can specify `REQUIRED` instead of `CERT_REQUIRED`.
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If it's neither `None` nor a string we assume it is already the numeric
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constant which can directly be passed to wrap_socket.
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"""
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if candidate is None:
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return CERT_NONE
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if isinstance(candidate, str):
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res = getattr(ssl, candidate, None)
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if res is None:
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res = getattr(ssl, 'CERT_' + candidate)
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return res
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return candidate
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def resolve_ssl_version(candidate):
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"""
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like resolve_cert_reqs
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"""
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if candidate is None:
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return PROTOCOL_SSLv23
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if isinstance(candidate, str):
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res = getattr(ssl, candidate, None)
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if res is None:
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res = getattr(ssl, 'PROTOCOL_' + candidate)
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return res
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return candidate
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def create_urllib3_context(ssl_version=None, cert_reqs=None,
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options=None, ciphers=None):
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"""All arguments have the same meaning as ``ssl_wrap_socket``.
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By default, this function does a lot of the same work that
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``ssl.create_default_context`` does on Python 3.4+. It:
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- Disables SSLv2, SSLv3, and compression
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- Sets a restricted set of server ciphers
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If you wish to enable SSLv3, you can do::
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from urllib3.util import ssl_
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context = ssl_.create_urllib3_context()
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context.options &= ~ssl_.OP_NO_SSLv3
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You can do the same to enable compression (substituting ``COMPRESSION``
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for ``SSLv3`` in the last line above).
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:param ssl_version:
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The desired protocol version to use. This will default to
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PROTOCOL_SSLv23 which will negotiate the highest protocol that both
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the server and your installation of OpenSSL support.
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:param cert_reqs:
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Whether to require the certificate verification. This defaults to
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``ssl.CERT_REQUIRED``.
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:param options:
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Specific OpenSSL options. These default to ``ssl.OP_NO_SSLv2``,
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``ssl.OP_NO_SSLv3``, ``ssl.OP_NO_COMPRESSION``.
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:param ciphers:
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Which cipher suites to allow the server to select.
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:returns:
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Constructed SSLContext object with specified options
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:rtype: SSLContext
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"""
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context = SSLContext(ssl_version or ssl.PROTOCOL_SSLv23)
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# Setting the default here, as we may have no ssl module on import
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cert_reqs = ssl.CERT_REQUIRED if cert_reqs is None else cert_reqs
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if options is None:
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options = 0
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# SSLv2 is easily broken and is considered harmful and dangerous
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options |= OP_NO_SSLv2
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# SSLv3 has several problems and is now dangerous
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options |= OP_NO_SSLv3
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# Disable compression to prevent CRIME attacks for OpenSSL 1.0+
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# (issue #309)
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options |= OP_NO_COMPRESSION
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context.options |= options
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if getattr(context, 'supports_set_ciphers', True): # Platform-specific: Python 2.6
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context.set_ciphers(ciphers or DEFAULT_CIPHERS)
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context.verify_mode = cert_reqs
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if getattr(context, 'check_hostname', None) is not None: # Platform-specific: Python 3.2
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# We do our own verification, including fingerprints and alternative
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# hostnames. So disable it here
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context.check_hostname = False
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return context
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def ssl_wrap_socket(sock, keyfile=None, certfile=None, cert_reqs=None,
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ca_certs=None, server_hostname=None,
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ssl_version=None, ciphers=None, ssl_context=None,
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ca_cert_dir=None):
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"""
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All arguments except for server_hostname, ssl_context, and ca_cert_dir have
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the same meaning as they do when using :func:`ssl.wrap_socket`.
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:param server_hostname:
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When SNI is supported, the expected hostname of the certificate
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:param ssl_context:
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A pre-made :class:`SSLContext` object. If none is provided, one will
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be created using :func:`create_urllib3_context`.
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:param ciphers:
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A string of ciphers we wish the client to support. This is not
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supported on Python 2.6 as the ssl module does not support it.
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:param ca_cert_dir:
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A directory containing CA certificates in multiple separate files, as
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supported by OpenSSL's -CApath flag or the capath argument to
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SSLContext.load_verify_locations().
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"""
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context = ssl_context
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if context is None:
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context = create_urllib3_context(ssl_version, cert_reqs,
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ciphers=ciphers)
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if ca_certs or ca_cert_dir:
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try:
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context.load_verify_locations(ca_certs, ca_cert_dir)
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except IOError as e: # Platform-specific: Python 2.6, 2.7, 3.2
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raise SSLError(e)
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# Py33 raises FileNotFoundError which subclasses OSError
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# These are not equivalent unless we check the errno attribute
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except OSError as e: # Platform-specific: Python 3.3 and beyond
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if e.errno == errno.ENOENT:
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raise SSLError(e)
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raise
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if certfile:
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context.load_cert_chain(certfile, keyfile)
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if HAS_SNI: # Platform-specific: OpenSSL with enabled SNI
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return context.wrap_socket(sock, server_hostname=server_hostname)
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warnings.warn(
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'An HTTPS request has been made, but the SNI (Subject Name '
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'Indication) extension to TLS is not available on this platform. '
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'This may cause the server to present an incorrect TLS '
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'certificate, which can cause validation failures. You can upgrade to '
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'a newer version of Python to solve this. For more information, see '
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'https://urllib3.readthedocs.io/en/latest/security.html'
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'#snimissingwarning.',
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SNIMissingWarning
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)
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return context.wrap_socket(sock)
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