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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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+# Copyright 2011, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+# * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+# * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+"""This file provides the opening handshake processor for the WebSocket
+protocol version HyBi 00.
+
+Specification:
+http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-00
+"""
+
+
+# Note: request.connection.write/read are used in this module, even though
+# mod_python document says that they should be used only in connection
+# handlers. Unfortunately, we have no other options. For example,
+# request.write/read are not suitable because they don't allow direct raw bytes
+# writing/reading.
+
+
+import logging
+import re
+import struct
+
+from mod_pywebsocket import common
+from mod_pywebsocket.stream import StreamHixie75
+from mod_pywebsocket import util
+from mod_pywebsocket.handshake._base import HandshakeException
+from mod_pywebsocket.handshake._base import check_request_line
+from mod_pywebsocket.handshake._base import format_header
+from mod_pywebsocket.handshake._base import get_default_port
+from mod_pywebsocket.handshake._base import get_mandatory_header
+from mod_pywebsocket.handshake._base import parse_host_header
+from mod_pywebsocket.handshake._base import validate_mandatory_header
+
+
+_MANDATORY_HEADERS = [
+ # key, expected value or None
+ [common.UPGRADE_HEADER, common.WEBSOCKET_UPGRADE_TYPE_HIXIE75],
+ [common.CONNECTION_HEADER, common.UPGRADE_CONNECTION_TYPE],
+]
+
+
+def _validate_subprotocol(subprotocol):
+ """Checks if characters in subprotocol are in range between U+0020 and
+ U+007E. A value in the Sec-WebSocket-Protocol field need to satisfy this
+ requirement.
+
+ See the Section 4.1. Opening handshake of the spec.
+ """
+
+ if not subprotocol:
+ raise HandshakeException('Invalid subprotocol name: empty')
+
+ # Parameter should be in the range U+0020 to U+007E.
+ for c in subprotocol:
+ if not 0x20 <= ord(c) <= 0x7e:
+ raise HandshakeException(
+ 'Illegal character in subprotocol name: %r' % c)
+
+
+def _check_header_lines(request, mandatory_headers):
+ check_request_line(request)
+
+ # The expected field names, and the meaning of their corresponding
+ # values, are as follows.
+ # |Upgrade| and |Connection|
+ for key, expected_value in mandatory_headers:
+ validate_mandatory_header(request, key, expected_value)
+
+
+def _build_location(request):
+ """Build WebSocket location for request."""
+
+ location_parts = []
+ if request.is_https():
+ location_parts.append(common.WEB_SOCKET_SECURE_SCHEME)
+ else:
+ location_parts.append(common.WEB_SOCKET_SCHEME)
+ location_parts.append('://')
+ host, port = parse_host_header(request)
+ connection_port = request.connection.local_addr[1]
+ if port != connection_port:
+ raise HandshakeException('Header/connection port mismatch: %d/%d' %
+ (port, connection_port))
+ location_parts.append(host)
+ if (port != get_default_port(request.is_https())):
+ location_parts.append(':')
+ location_parts.append(str(port))
+ location_parts.append(request.unparsed_uri)
+ return ''.join(location_parts)
+
+
+class Handshaker(object):
+ """Opening handshake processor for the WebSocket protocol version HyBi 00.
+ """
+
+ def __init__(self, request, dispatcher):
+ """Construct an instance.
+
+ Args:
+ request: mod_python request.
+ dispatcher: Dispatcher (dispatch.Dispatcher).
+
+ Handshaker will add attributes such as ws_resource in performing
+ handshake.
+ """
+
+ self._logger = util.get_class_logger(self)
+
+ self._request = request
+ self._dispatcher = dispatcher
+
+ def do_handshake(self):
+ """Perform WebSocket Handshake.
+
+ On _request, we set
+ ws_resource, ws_protocol, ws_location, ws_origin, ws_challenge,
+ ws_challenge_md5: WebSocket handshake information.
+ ws_stream: Frame generation/parsing class.
+ ws_version: Protocol version.
+
+ Raises:
+ HandshakeException: when any error happened in parsing the opening
+ handshake request.
+ """
+
+ # 5.1 Reading the client's opening handshake.
+ # dispatcher sets it in self._request.
+ _check_header_lines(self._request, _MANDATORY_HEADERS)
+ self._set_resource()
+ self._set_subprotocol()
+ self._set_location()
+ self._set_origin()
+ self._set_challenge_response()
+ self._set_protocol_version()
+
+ self._dispatcher.do_extra_handshake(self._request)
+
+ self._send_handshake()
+
+ def _set_resource(self):
+ self._request.ws_resource = self._request.uri
+
+ def _set_subprotocol(self):
+ # |Sec-WebSocket-Protocol|
+ subprotocol = self._request.headers_in.get(
+ common.SEC_WEBSOCKET_PROTOCOL_HEADER)
+ if subprotocol is not None:
+ _validate_subprotocol(subprotocol)
+ self._request.ws_protocol = subprotocol
+
+ def _set_location(self):
+ # |Host|
+ host = self._request.headers_in.get(common.HOST_HEADER)
+ if host is not None:
+ self._request.ws_location = _build_location(self._request)
+ # TODO(ukai): check host is this host.
+
+ def _set_origin(self):
+ # |Origin|
+ origin = self._request.headers_in.get(common.ORIGIN_HEADER)
+ if origin is not None:
+ self._request.ws_origin = origin
+
+ def _set_protocol_version(self):
+ # |Sec-WebSocket-Draft|
+ draft = self._request.headers_in.get(common.SEC_WEBSOCKET_DRAFT_HEADER)
+ if draft is not None and draft != '0':
+ raise HandshakeException('Illegal value for %s: %s' %
+ (common.SEC_WEBSOCKET_DRAFT_HEADER,
+ draft))
+
+ self._logger.debug('Protocol version is HyBi 00')
+ self._request.ws_version = common.VERSION_HYBI00
+ self._request.ws_stream = StreamHixie75(self._request, True)
+
+ def _set_challenge_response(self):
+ # 5.2 4-8.
+ self._request.ws_challenge = self._get_challenge()
+ # 5.2 9. let /response/ be the MD5 finterprint of /challenge/
+ self._request.ws_challenge_md5 = util.md5_hash(
+ self._request.ws_challenge).digest()
+ self._logger.debug(
+ 'Challenge: %r (%s)',
+ self._request.ws_challenge,
+ util.hexify(self._request.ws_challenge))
+ self._logger.debug(
+ 'Challenge response: %r (%s)',
+ self._request.ws_challenge_md5,
+ util.hexify(self._request.ws_challenge_md5))
+
+ def _get_key_value(self, key_field):
+ key_value = get_mandatory_header(self._request, key_field)
+
+ self._logger.debug('%s: %r', key_field, key_value)
+
+ # 5.2 4. let /key-number_n/ be the digits (characters in the range
+ # U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9)) in /key_n/,
+ # interpreted as a base ten integer, ignoring all other characters
+ # in /key_n/.
+ try:
+ key_number = int(re.sub("\\D", "", key_value))
+ except:
+ raise HandshakeException('%s field contains no digit' % key_field)
+ # 5.2 5. let /spaces_n/ be the number of U+0020 SPACE characters
+ # in /key_n/.
+ spaces = re.subn(" ", "", key_value)[1]
+ if spaces == 0:
+ raise HandshakeException('%s field contains no space' % key_field)
+
+ self._logger.debug(
+ '%s: Key-number is %d and number of spaces is %d',
+ key_field, key_number, spaces)
+
+ # 5.2 6. if /key-number_n/ is not an integral multiple of /spaces_n/
+ # then abort the WebSocket connection.
+ if key_number % spaces != 0:
+ raise HandshakeException(
+ '%s: Key-number (%d) is not an integral multiple of spaces '
+ '(%d)' % (key_field, key_number, spaces))
+ # 5.2 7. let /part_n/ be /key-number_n/ divided by /spaces_n/.
+ part = key_number / spaces
+ self._logger.debug('%s: Part is %d', key_field, part)
+ return part
+
+ def _get_challenge(self):
+ # 5.2 4-7.
+ key1 = self._get_key_value(common.SEC_WEBSOCKET_KEY1_HEADER)
+ key2 = self._get_key_value(common.SEC_WEBSOCKET_KEY2_HEADER)
+ # 5.2 8. let /challenge/ be the concatenation of /part_1/,
+ challenge = ''
+ challenge += struct.pack('!I', key1) # network byteorder int
+ challenge += struct.pack('!I', key2) # network byteorder int
+ challenge += self._request.connection.read(8)
+ return challenge
+
+ def _send_handshake(self):
+ response = []
+
+ # 5.2 10. send the following line.
+ response.append('HTTP/1.1 101 WebSocket Protocol Handshake\r\n')
+
+ # 5.2 11. send the following fields to the client.
+ response.append(format_header(
+ common.UPGRADE_HEADER, common.WEBSOCKET_UPGRADE_TYPE_HIXIE75))
+ response.append(format_header(
+ common.CONNECTION_HEADER, common.UPGRADE_CONNECTION_TYPE))
+ response.append(format_header(
+ common.SEC_WEBSOCKET_LOCATION_HEADER, self._request.ws_location))
+ response.append(format_header(
+ common.SEC_WEBSOCKET_ORIGIN_HEADER, self._request.ws_origin))
+ if self._request.ws_protocol:
+ response.append(format_header(
+ common.SEC_WEBSOCKET_PROTOCOL_HEADER,
+ self._request.ws_protocol))
+ # 5.2 12. send two bytes 0x0D 0x0A.
+ response.append('\r\n')
+ # 5.2 13. send /response/
+ response.append(self._request.ws_challenge_md5)
+
+ raw_response = ''.join(response)
+ self._request.connection.write(raw_response)
+ self._logger.debug('Sent server\'s opening handshake: %r',
+ raw_response)
+
+
+# vi:sts=4 sw=4 et