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except (ImportError, AttributeError): # Platform-specific: No SSL. ssl = None
class BaseSSLError(BaseException): pass
# Python 3: not a no-op, we're adding this to the namespace so it can be imported. except NameError: # Python 2 class ConnectionError(Exception): pass
NewConnectionError, ConnectTimeoutError, SubjectAltNameWarning, SystemTimeWarning, )
resolve_cert_reqs, resolve_ssl_version, assert_fingerprint, create_urllib3_context, ssl_wrap_socket, )
# When it comes time to update this value as a part of regular maintenance # (ie test_recent_date is failing) update it to ~6 months before the current date.
"""Used to detect a failed ConnectionCls import."""
""" Based on httplib.HTTPConnection but provides an extra constructor backwards-compatibility layer between older and newer Pythons.
Additional keyword parameters are used to configure attributes of the connection. Accepted parameters include:
- ``strict``: See the documentation on :class:`urllib3.connectionpool.HTTPConnectionPool` - ``source_address``: Set the source address for the current connection. - ``socket_options``: Set specific options on the underlying socket. If not specified, then defaults are loaded from ``HTTPConnection.default_socket_options`` which includes disabling Nagle's algorithm (sets TCP_NODELAY to 1) unless the connection is behind a proxy.
For example, if you wish to enable TCP Keep Alive in addition to the defaults, you might pass::
HTTPConnection.default_socket_options + [ (socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1), ]
Or you may want to disable the defaults by passing an empty list (e.g., ``[]``). """
#: Disable Nagle's algorithm by default. #: ``[(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)]``
#: Whether this connection verifies the host's certificate.
# Pre-set source_address.
#: The socket options provided by the user. If no options are #: provided, we use the default options.
def host(self): """ Getter method to remove any trailing dots that indicate the hostname is an FQDN.
In general, SSL certificates don't include the trailing dot indicating a fully-qualified domain name, and thus, they don't validate properly when checked against a domain name that includes the dot. In addition, some servers may not expect to receive the trailing dot when provided.
However, the hostname with trailing dot is critical to DNS resolution; doing a lookup with the trailing dot will properly only resolve the appropriate FQDN, whereas a lookup without a trailing dot will search the system's search domain list. Thus, it's important to keep the original host around for use only in those cases where it's appropriate (i.e., when doing DNS lookup to establish the actual TCP connection across which we're going to send HTTP requests). """
def host(self, value): """ Setter for the `host` property.
We assume that only urllib3 uses the _dns_host attribute; httplib itself only uses `host`, and it seems reasonable that other libraries follow suit. """
""" Establish a socket connection and set nodelay settings on it.
:return: New socket connection. """ extra_kw["source_address"] = self.source_address
(self._dns_host, self.port), self.timeout, **extra_kw )
except SocketTimeout: raise ConnectTimeoutError( self, "Connection to %s timed out. (connect timeout=%s)" % (self.host, self.timeout), )
except SocketError as e: raise NewConnectionError( self, "Failed to establish a new connection: %s" % e )
# Google App Engine's httplib does not define _tunnel_host # TODO: Fix tunnel so it doesn't depend on self.sock state. self._tunnel() # Mark this connection as not reusable self.auto_open = 0
"""Send a request to the server""" raise ValueError( "Method cannot contain non-token characters %r (found at least %r)" % (method, match.group()) )
""" Alternative to the common request method, which sends the body with chunked encoding and not as one block """ headers = HTTPHeaderDict(headers if headers is not None else {}) skip_accept_encoding = "accept-encoding" in headers skip_host = "host" in headers self.putrequest( method, url, skip_accept_encoding=skip_accept_encoding, skip_host=skip_host ) for header, value in headers.items(): self.putheader(header, value) if "transfer-encoding" not in headers: self.putheader("Transfer-Encoding", "chunked") self.endheaders()
if body is not None: stringish_types = six.string_types + (bytes,) if isinstance(body, stringish_types): body = (body,) for chunk in body: if not chunk: continue if not isinstance(chunk, bytes): chunk = chunk.encode("utf8") len_str = hex(len(chunk))[2:] to_send = bytearray(len_str.encode()) to_send += b"\r\n" to_send += chunk to_send += b"\r\n" self.send(to_send)
# After the if clause, to always have a closed body self.send(b"0\r\n\r\n")
self, host, port=None, key_file=None, cert_file=None, key_password=None, strict=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT, ssl_context=None, server_hostname=None, **kw ):
# Required property for Google AppEngine 1.9.0 which otherwise causes # HTTPS requests to go out as HTTP. (See Issue #356)
self, key_file=None, cert_file=None, cert_reqs=None, key_password=None, ca_certs=None, assert_hostname=None, assert_fingerprint=None, ca_cert_dir=None, ca_cert_data=None, ): """ This method should only be called once, before the connection is used. """ # If cert_reqs is not provided we'll assume CERT_REQUIRED unless we also # have an SSLContext object in which case we'll use its verify_mode. if self.ssl_context is not None: cert_reqs = self.ssl_context.verify_mode else: cert_reqs = resolve_cert_reqs(None)
# Add certificate verification
# Google App Engine's httplib does not define _tunnel_host self.sock = conn # Calls self._set_hostport(), so self.host is # self._tunnel_host below. self._tunnel() # Mark this connection as not reusable self.auto_open = 0
# Override the host with the one we're requesting data from. hostname = self._tunnel_host
server_hostname = self.server_hostname
warnings.warn( ( "System time is way off (before {0}). This will probably " "lead to SSL verification errors" ).format(RECENT_DATE), SystemTimeWarning, )
# Wrap socket using verification with the root certs in # trusted_root_certs ssl_version=resolve_ssl_version(self.ssl_version), cert_reqs=resolve_cert_reqs(self.cert_reqs), )
# Try to load OS default certs if none are given. # Works well on Windows (requires Python3.4+) not self.ca_certs and not self.ca_cert_dir and not self.ca_cert_data and default_ssl_context and hasattr(context, "load_default_certs") ): context.load_default_certs()
sock=conn, keyfile=self.key_file, certfile=self.cert_file, key_password=self.key_password, ca_certs=self.ca_certs, ca_cert_dir=self.ca_cert_dir, ca_cert_data=self.ca_cert_data, server_hostname=server_hostname, ssl_context=context, )
assert_fingerprint( self.sock.getpeercert(binary_form=True), self.assert_fingerprint ) context.verify_mode != ssl.CERT_NONE and not getattr(context, "check_hostname", False) and self.assert_hostname is not False ): # While urllib3 attempts to always turn off hostname matching from # the TLS library, this cannot always be done. So we check whether # the TLS Library still thinks it's matching hostnames. warnings.warn( ( "Certificate for {0} has no `subjectAltName`, falling back to check for a " "`commonName` for now. This feature is being removed by major browsers and " "deprecated by RFC 2818. (See https://github.com/urllib3/urllib3/issues/497 " "for details.)".format(hostname) ), SubjectAltNameWarning, )
context.verify_mode == ssl.CERT_REQUIRED or self.assert_fingerprint is not None )
except CertificateError as e: log.warning( "Certificate did not match expected hostname: %s. Certificate: %s", asserted_hostname, cert, ) # Add cert to exception and reraise so client code can inspect # the cert when catching the exception, if they want to e._peer_cert = cert raise
HTTPSConnection = DummyConnection # noqa: F811
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