forked from s434650/CatOrNot
261 lines
8.3 KiB
Python
261 lines
8.3 KiB
Python
|
import os
|
||
|
|
import socket
|
||
|
|
import atexit
|
||
|
|
import re
|
||
|
|
import functools
|
||
|
|
|
||
|
|
from setuptools.extern.six.moves import urllib, http_client, map, filter
|
||
|
|
|
||
|
|
from pkg_resources import ResolutionError, ExtractionError
|
||
|
|
|
||
|
|
try:
|
||
|
|
import ssl
|
||
|
|
except ImportError:
|
||
|
|
ssl = None
|
||
|
|
|
||
|
|
__all__ = [
|
||
|
|
'VerifyingHTTPSHandler', 'find_ca_bundle', 'is_available', 'cert_paths',
|
||
|
|
'opener_for'
|
||
|
|
]
|
||
|
|
|
||
|
|
cert_paths = """
|
||
|
|
/etc/pki/tls/certs/ca-bundle.crt
|
||
|
|
/etc/ssl/certs/ca-certificates.crt
|
||
|
|
/usr/share/ssl/certs/ca-bundle.crt
|
||
|
|
/usr/local/share/certs/ca-root.crt
|
||
|
|
/etc/ssl/cert.pem
|
||
|
|
/System/Library/OpenSSL/certs/cert.pem
|
||
|
|
/usr/local/share/certs/ca-root-nss.crt
|
||
|
|
/etc/ssl/ca-bundle.pem
|
||
|
|
""".strip().split()
|
||
|
|
|
||
|
|
try:
|
||
|
|
HTTPSHandler = urllib.request.HTTPSHandler
|
||
|
|
HTTPSConnection = http_client.HTTPSConnection
|
||
|
|
except AttributeError:
|
||
|
|
HTTPSHandler = HTTPSConnection = object
|
||
|
|
|
||
|
|
is_available = ssl is not None and object not in (HTTPSHandler, HTTPSConnection)
|
||
|
|
|
||
|
|
|
||
|
|
try:
|
||
|
|
from ssl import CertificateError, match_hostname
|
||
|
|
except ImportError:
|
||
|
|
try:
|
||
|
|
from backports.ssl_match_hostname import CertificateError
|
||
|
|
from backports.ssl_match_hostname import match_hostname
|
||
|
|
except ImportError:
|
||
|
|
CertificateError = None
|
||
|
|
match_hostname = None
|
||
|
|
|
||
|
|
if not CertificateError:
|
||
|
|
|
||
|
|
class CertificateError(ValueError):
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
if not match_hostname:
|
||
|
|
|
||
|
|
def _dnsname_match(dn, hostname, max_wildcards=1):
|
||
|
|
"""Matching according to RFC 6125, section 6.4.3
|
||
|
|
|
||
|
|
http://tools.ietf.org/html/rfc6125#section-6.4.3
|
||
|
|
"""
|
||
|
|
pats = []
|
||
|
|
if not dn:
|
||
|
|
return False
|
||
|
|
|
||
|
|
# Ported from python3-syntax:
|
||
|
|
# leftmost, *remainder = dn.split(r'.')
|
||
|
|
parts = dn.split(r'.')
|
||
|
|
leftmost = parts[0]
|
||
|
|
remainder = parts[1:]
|
||
|
|
|
||
|
|
wildcards = leftmost.count('*')
|
||
|
|
if wildcards > max_wildcards:
|
||
|
|
# Issue #17980: avoid denials of service by refusing more
|
||
|
|
# than one wildcard per fragment. A survey of established
|
||
|
|
# policy among SSL implementations showed it to be a
|
||
|
|
# reasonable choice.
|
||
|
|
raise CertificateError(
|
||
|
|
"too many wildcards in certificate DNS name: " + repr(dn))
|
||
|
|
|
||
|
|
# speed up common case w/o wildcards
|
||
|
|
if not wildcards:
|
||
|
|
return dn.lower() == hostname.lower()
|
||
|
|
|
||
|
|
# RFC 6125, section 6.4.3, subitem 1.
|
||
|
|
# The client SHOULD NOT attempt to match a presented identifier in which
|
||
|
|
# the wildcard character comprises a label other than the left-most label.
|
||
|
|
if leftmost == '*':
|
||
|
|
# When '*' is a fragment by itself, it matches a non-empty dotless
|
||
|
|
# fragment.
|
||
|
|
pats.append('[^.]+')
|
||
|
|
elif leftmost.startswith('xn--') or hostname.startswith('xn--'):
|
||
|
|
# RFC 6125, section 6.4.3, subitem 3.
|
||
|
|
# The client SHOULD NOT attempt to match a presented identifier
|
||
|
|
# where the wildcard character is embedded within an A-label or
|
||
|
|
# U-label of an internationalized domain name.
|
||
|
|
pats.append(re.escape(leftmost))
|
||
|
|
else:
|
||
|
|
# Otherwise, '*' matches any dotless string, e.g. www*
|
||
|
|
pats.append(re.escape(leftmost).replace(r'\*', '[^.]*'))
|
||
|
|
|
||
|
|
# add the remaining fragments, ignore any wildcards
|
||
|
|
for frag in remainder:
|
||
|
|
pats.append(re.escape(frag))
|
||
|
|
|
||
|
|
pat = re.compile(r'\A' + r'\.'.join(pats) + r'\Z', re.IGNORECASE)
|
||
|
|
return pat.match(hostname)
|
||
|
|
|
||
|
|
def match_hostname(cert, hostname):
|
||
|
|
"""Verify that *cert* (in decoded format as returned by
|
||
|
|
SSLSocket.getpeercert()) matches the *hostname*. RFC 2818 and RFC 6125
|
||
|
|
rules are followed, but IP addresses are not accepted for *hostname*.
|
||
|
|
|
||
|
|
CertificateError is raised on failure. On success, the function
|
||
|
|
returns nothing.
|
||
|
|
"""
|
||
|
|
if not cert:
|
||
|
|
raise ValueError("empty or no certificate")
|
||
|
|
dnsnames = []
|
||
|
|
san = cert.get('subjectAltName', ())
|
||
|
|
for key, value in san:
|
||
|
|
if key == 'DNS':
|
||
|
|
if _dnsname_match(value, hostname):
|
||
|
|
return
|
||
|
|
dnsnames.append(value)
|
||
|
|
if not dnsnames:
|
||
|
|
# The subject is only checked when there is no dNSName entry
|
||
|
|
# in subjectAltName
|
||
|
|
for sub in cert.get('subject', ()):
|
||
|
|
for key, value in sub:
|
||
|
|
# XXX according to RFC 2818, the most specific Common Name
|
||
|
|
# must be used.
|
||
|
|
if key == 'commonName':
|
||
|
|
if _dnsname_match(value, hostname):
|
||
|
|
return
|
||
|
|
dnsnames.append(value)
|
||
|
|
if len(dnsnames) > 1:
|
||
|
|
raise CertificateError("hostname %r "
|
||
|
|
"doesn't match either of %s"
|
||
|
|
% (hostname, ', '.join(map(repr, dnsnames))))
|
||
|
|
elif len(dnsnames) == 1:
|
||
|
|
raise CertificateError("hostname %r "
|
||
|
|
"doesn't match %r"
|
||
|
|
% (hostname, dnsnames[0]))
|
||
|
|
else:
|
||
|
|
raise CertificateError("no appropriate commonName or "
|
||
|
|
"subjectAltName fields were found")
|
||
|
|
|
||
|
|
|
||
|
|
class VerifyingHTTPSHandler(HTTPSHandler):
|
||
|
|
"""Simple verifying handler: no auth, subclasses, timeouts, etc."""
|
||
|
|
|
||
|
|
def __init__(self, ca_bundle):
|
||
|
|
self.ca_bundle = ca_bundle
|
||
|
|
HTTPSHandler.__init__(self)
|
||
|
|
|
||
|
|
def https_open(self, req):
|
||
|
|
return self.do_open(
|
||
|
|
lambda host, **kw: VerifyingHTTPSConn(host, self.ca_bundle, **kw), req
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
class VerifyingHTTPSConn(HTTPSConnection):
|
||
|
|
"""Simple verifying connection: no auth, subclasses, timeouts, etc."""
|
||
|
|
|
||
|
|
def __init__(self, host, ca_bundle, **kw):
|
||
|
|
HTTPSConnection.__init__(self, host, **kw)
|
||
|
|
self.ca_bundle = ca_bundle
|
||
|
|
|
||
|
|
def connect(self):
|
||
|
|
sock = socket.create_connection(
|
||
|
|
(self.host, self.port), getattr(self, 'source_address', None)
|
||
|
|
)
|
||
|
|
|
||
|
|
# Handle the socket if a (proxy) tunnel is present
|
||
|
|
if hasattr(self, '_tunnel') and getattr(self, '_tunnel_host', None):
|
||
|
|
self.sock = sock
|
||
|
|
self._tunnel()
|
||
|
|
# http://bugs.python.org/issue7776: Python>=3.4.1 and >=2.7.7
|
||
|
|
# change self.host to mean the proxy server host when tunneling is
|
||
|
|
# being used. Adapt, since we are interested in the destination
|
||
|
|
# host for the match_hostname() comparison.
|
||
|
|
actual_host = self._tunnel_host
|
||
|
|
else:
|
||
|
|
actual_host = self.host
|
||
|
|
|
||
|
|
if hasattr(ssl, 'create_default_context'):
|
||
|
|
ctx = ssl.create_default_context(cafile=self.ca_bundle)
|
||
|
|
self.sock = ctx.wrap_socket(sock, server_hostname=actual_host)
|
||
|
|
else:
|
||
|
|
# This is for python < 2.7.9 and < 3.4?
|
||
|
|
self.sock = ssl.wrap_socket(
|
||
|
|
sock, cert_reqs=ssl.CERT_REQUIRED, ca_certs=self.ca_bundle
|
||
|
|
)
|
||
|
|
try:
|
||
|
|
match_hostname(self.sock.getpeercert(), actual_host)
|
||
|
|
except CertificateError:
|
||
|
|
self.sock.shutdown(socket.SHUT_RDWR)
|
||
|
|
self.sock.close()
|
||
|
|
raise
|
||
|
|
|
||
|
|
|
||
|
|
def opener_for(ca_bundle=None):
|
||
|
|
"""Get a urlopen() replacement that uses ca_bundle for verification"""
|
||
|
|
return urllib.request.build_opener(
|
||
|
|
VerifyingHTTPSHandler(ca_bundle or find_ca_bundle())
|
||
|
|
).open
|
||
|
|
|
||
|
|
|
||
|
|
# from jaraco.functools
|
||
|
|
def once(func):
|
||
|
|
@functools.wraps(func)
|
||
|
|
def wrapper(*args, **kwargs):
|
||
|
|
if not hasattr(func, 'always_returns'):
|
||
|
|
func.always_returns = func(*args, **kwargs)
|
||
|
|
return func.always_returns
|
||
|
|
return wrapper
|
||
|
|
|
||
|
|
|
||
|
|
@once
|
||
|
|
def get_win_certfile():
|
||
|
|
try:
|
||
|
|
import wincertstore
|
||
|
|
except ImportError:
|
||
|
|
return None
|
||
|
|
|
||
|
|
class CertFile(wincertstore.CertFile):
|
||
|
|
def __init__(self):
|
||
|
|
super(CertFile, self).__init__()
|
||
|
|
atexit.register(self.close)
|
||
|
|
|
||
|
|
def close(self):
|
||
|
|
try:
|
||
|
|
super(CertFile, self).close()
|
||
|
|
except OSError:
|
||
|
|
pass
|
||
|
|
|
||
|
|
_wincerts = CertFile()
|
||
|
|
_wincerts.addstore('CA')
|
||
|
|
_wincerts.addstore('ROOT')
|
||
|
|
return _wincerts.name
|
||
|
|
|
||
|
|
|
||
|
|
def find_ca_bundle():
|
||
|
|
"""Return an existing CA bundle path, or None"""
|
||
|
|
extant_cert_paths = filter(os.path.isfile, cert_paths)
|
||
|
|
return (
|
||
|
|
get_win_certfile()
|
||
|
|
or next(extant_cert_paths, None)
|
||
|
|
or _certifi_where()
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def _certifi_where():
|
||
|
|
try:
|
||
|
|
return __import__('certifi').where()
|
||
|
|
except (ImportError, ResolutionError, ExtractionError):
|
||
|
|
pass
|