import sys, os, socket, atexit, re
import pkg_resources
from pkg_resources import ResolutionError, ExtractionError
from setuptools.compat import urllib2
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
""".strip().split()
HTTPSHandler = HTTPSConnection = object
for what, where in (
('HTTPSHandler', ['urllib2','urllib.request']),
('HTTPSConnection', ['httplib', 'http.client']),
):
for module in where:
try:
exec("from %s import %s" % (module, what))
except ImportError:
pass
is_available = ssl is not None and object not in (HTTPSHandler, HTTPSConnection)
try:
from socket import create_connection
except ImportError:
_GLOBAL_DEFAULT_TIMEOUT = getattr(socket, '_GLOBAL_DEFAULT_TIMEOUT', object())
def create_connection(address, timeout=_GLOBAL_DEFAULT_TIMEOUT,
source_address=None):
"""Connect to *address* and return the socket object.
Convenience function. Connect to *address* (a 2-tuple ``(host,
port)``) and return the socket object. Passing the optional
*timeout* parameter will set the timeout on the socket instance
before attempting to connect. If no *timeout* is supplied, the
global default timeout setting returned by :func:`getdefaulttimeout`
is used. If *source_address* is set it must be a tuple of (host, port)
for the socket to bind as a source address before making the connection.
An host of '' or port 0 tells the OS to use the default.
"""
host, port = address
err = None
for res in socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM):
af, socktype, proto, canonname, sa = res
sock = None
try:
sock = socket.socket(af, socktype, proto)
if timeout is not _GLOBAL_DEFAULT_TIMEOUT:
sock.settimeout(timeout)
if source_address:
sock.bind(source_address)
sock.connect(sa)
return sock
except error:
err = True
if sock is not None:
sock.close()
if err:
raise
else:
raise error("getaddrinfo returns an empty list")
from backports.ssl_match_hostname import CertificateError, match_hostname
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 = 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
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 urllib2.build_opener(
VerifyingHTTPSHandler(ca_bundle or find_ca_bundle())
).open
_wincerts = None
def get_win_certfile():
global _wincerts
if _wincerts is not None:
return _wincerts.name
try:
from wincertstore import CertFile
except ImportError:
return None
class MyCertFile(CertFile):
def __init__(self, stores=(), certs=()):
CertFile.__init__(self)
for store in stores:
self.addstore(store)
self.addcerts(certs)
atexit.register(self.close)
_wincerts = MyCertFile(stores=['CA', 'ROOT'])
return _wincerts.name
def find_ca_bundle():
"""Return an existing CA bundle path, or None"""
if os.name=='nt':
return get_win_certfile()
else:
for cert_path in cert_paths:
if os.path.isfile(cert_path):
return cert_path
try:
return pkg_resources.resource_filename('certifi', 'cacert.pem')
except (ImportError, ResolutionError, ExtractionError):
return None