summaryrefslogtreecommitdiffstats
path: root/testing/mochitest/pywebsocket3/mod_pywebsocket/handshake/hybi.py
diff options
context:
space:
mode:
Diffstat (limited to 'testing/mochitest/pywebsocket3/mod_pywebsocket/handshake/hybi.py')
-rw-r--r--testing/mochitest/pywebsocket3/mod_pywebsocket/handshake/hybi.py403
1 files changed, 403 insertions, 0 deletions
diff --git a/testing/mochitest/pywebsocket3/mod_pywebsocket/handshake/hybi.py b/testing/mochitest/pywebsocket3/mod_pywebsocket/handshake/hybi.py
new file mode 100644
index 0000000000..bddbafcca8
--- /dev/null
+++ b/testing/mochitest/pywebsocket3/mod_pywebsocket/handshake/hybi.py
@@ -0,0 +1,403 @@
+# Copyright 2012, 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 (RFC 6455).
+
+Specification:
+http://tools.ietf.org/html/rfc6455
+"""
+
+from __future__ import absolute_import
+import base64
+import logging
+import os
+import re
+from hashlib import sha1
+
+from mod_pywebsocket import common
+from mod_pywebsocket.extensions import get_extension_processor
+from mod_pywebsocket.handshake._base import check_request_line
+from mod_pywebsocket.handshake._base import format_header
+from mod_pywebsocket.handshake._base import get_mandatory_header
+from mod_pywebsocket.handshake._base import HandshakeException
+from mod_pywebsocket.handshake._base import parse_token_list
+from mod_pywebsocket.handshake._base import validate_mandatory_header
+from mod_pywebsocket.handshake._base import validate_subprotocol
+from mod_pywebsocket.handshake._base import VersionException
+from mod_pywebsocket.stream import Stream
+from mod_pywebsocket.stream import StreamOptions
+from mod_pywebsocket import util
+from six.moves import map
+from six.moves import range
+
+# Used to validate the value in the Sec-WebSocket-Key header strictly. RFC 4648
+# disallows non-zero padding, so the character right before == must be any of
+# A, Q, g and w.
+_SEC_WEBSOCKET_KEY_REGEX = re.compile('^[+/0-9A-Za-z]{21}[AQgw]==$')
+
+# Defining aliases for values used frequently.
+_VERSION_LATEST = common.VERSION_HYBI_LATEST
+_VERSION_LATEST_STRING = str(_VERSION_LATEST)
+_SUPPORTED_VERSIONS = [
+ _VERSION_LATEST,
+]
+
+
+def compute_accept(key):
+ """Computes value for the Sec-WebSocket-Accept header from value of the
+ Sec-WebSocket-Key header.
+ """
+
+ accept_binary = sha1(key + common.WEBSOCKET_ACCEPT_UUID).digest()
+ accept = base64.b64encode(accept_binary)
+
+ return accept
+
+
+def compute_accept_from_unicode(unicode_key):
+ """A wrapper function for compute_accept which takes a unicode string as an
+ argument, and encodes it to byte string. It then passes it on to
+ compute_accept.
+ """
+
+ key = unicode_key.encode('UTF-8')
+ return compute_accept(key)
+
+
+class Handshaker(object):
+ """Opening handshake processor for the WebSocket protocol (RFC 6455)."""
+ 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 during handshake.
+ """
+
+ self._logger = util.get_class_logger(self)
+
+ self._request = request
+ self._dispatcher = dispatcher
+
+ def _validate_connection_header(self):
+ connection = get_mandatory_header(self._request,
+ common.CONNECTION_HEADER)
+
+ try:
+ connection_tokens = parse_token_list(connection)
+ except HandshakeException as e:
+ raise HandshakeException('Failed to parse %s: %s' %
+ (common.CONNECTION_HEADER, e))
+
+ connection_is_valid = False
+ for token in connection_tokens:
+ if token.lower() == common.UPGRADE_CONNECTION_TYPE.lower():
+ connection_is_valid = True
+ break
+ if not connection_is_valid:
+ raise HandshakeException(
+ '%s header doesn\'t contain "%s"' %
+ (common.CONNECTION_HEADER, common.UPGRADE_CONNECTION_TYPE))
+
+ def do_handshake(self):
+ self._request.ws_close_code = None
+ self._request.ws_close_reason = None
+
+ # Parsing.
+
+ check_request_line(self._request)
+
+ validate_mandatory_header(self._request, common.UPGRADE_HEADER,
+ common.WEBSOCKET_UPGRADE_TYPE)
+
+ self._validate_connection_header()
+
+ self._request.ws_resource = self._request.uri
+
+ unused_host = get_mandatory_header(self._request, common.HOST_HEADER)
+
+ self._request.ws_version = self._check_version()
+
+ try:
+ self._get_origin()
+ self._set_protocol()
+ self._parse_extensions()
+
+ # Key validation, response generation.
+
+ key = self._get_key()
+ accept = compute_accept(key)
+ self._logger.debug('%s: %r (%s)',
+ common.SEC_WEBSOCKET_ACCEPT_HEADER, accept,
+ util.hexify(base64.b64decode(accept)))
+
+ self._logger.debug('Protocol version is RFC 6455')
+
+ # Setup extension processors.
+
+ processors = []
+ if self._request.ws_requested_extensions is not None:
+ for extension_request in self._request.ws_requested_extensions:
+ processor = get_extension_processor(extension_request)
+ # Unknown extension requests are just ignored.
+ if processor is not None:
+ processors.append(processor)
+ self._request.ws_extension_processors = processors
+
+ # List of extra headers. The extra handshake handler may add header
+ # data as name/value pairs to this list and pywebsocket appends
+ # them to the WebSocket handshake.
+ self._request.extra_headers = []
+
+ # Extra handshake handler may modify/remove processors.
+ self._dispatcher.do_extra_handshake(self._request)
+ processors = [
+ processor
+ for processor in self._request.ws_extension_processors
+ if processor is not None
+ ]
+
+ # Ask each processor if there are extensions on the request which
+ # cannot co-exist. When processor decided other processors cannot
+ # co-exist with it, the processor marks them (or itself) as
+ # "inactive". The first extension processor has the right to
+ # make the final call.
+ for processor in reversed(processors):
+ if processor.is_active():
+ processor.check_consistency_with_other_processors(
+ processors)
+ processors = [
+ processor for processor in processors if processor.is_active()
+ ]
+
+ accepted_extensions = []
+
+ stream_options = StreamOptions()
+
+ for index, processor in enumerate(processors):
+ if not processor.is_active():
+ continue
+
+ extension_response = processor.get_extension_response()
+ if extension_response is None:
+ # Rejected.
+ continue
+
+ accepted_extensions.append(extension_response)
+
+ processor.setup_stream_options(stream_options)
+
+ # Inactivate all of the following compression extensions.
+ for j in range(index + 1, len(processors)):
+ processors[j].set_active(False)
+
+ if len(accepted_extensions) > 0:
+ self._request.ws_extensions = accepted_extensions
+ self._logger.debug(
+ 'Extensions accepted: %r',
+ list(
+ map(common.ExtensionParameter.name,
+ accepted_extensions)))
+ else:
+ self._request.ws_extensions = None
+
+ self._request.ws_stream = self._create_stream(stream_options)
+
+ if self._request.ws_requested_protocols is not None:
+ if self._request.ws_protocol is None:
+ raise HandshakeException(
+ 'do_extra_handshake must choose one subprotocol from '
+ 'ws_requested_protocols and set it to ws_protocol')
+ validate_subprotocol(self._request.ws_protocol)
+
+ self._logger.debug('Subprotocol accepted: %r',
+ self._request.ws_protocol)
+ else:
+ if self._request.ws_protocol is not None:
+ raise HandshakeException(
+ 'ws_protocol must be None when the client didn\'t '
+ 'request any subprotocol')
+
+ self._send_handshake(accept)
+ except HandshakeException as e:
+ if not e.status:
+ # Fallback to 400 bad request by default.
+ e.status = common.HTTP_STATUS_BAD_REQUEST
+ raise e
+
+ def _get_origin(self):
+ origin_header = common.ORIGIN_HEADER
+ origin = self._request.headers_in.get(origin_header)
+ if origin is None:
+ self._logger.debug('Client request does not have origin header')
+ self._request.ws_origin = origin
+
+ def _check_version(self):
+ version = get_mandatory_header(self._request,
+ common.SEC_WEBSOCKET_VERSION_HEADER)
+ if version == _VERSION_LATEST_STRING:
+ return _VERSION_LATEST
+
+ if version.find(',') >= 0:
+ raise HandshakeException(
+ 'Multiple versions (%r) are not allowed for header %s' %
+ (version, common.SEC_WEBSOCKET_VERSION_HEADER),
+ status=common.HTTP_STATUS_BAD_REQUEST)
+ raise VersionException('Unsupported version %r for header %s' %
+ (version, common.SEC_WEBSOCKET_VERSION_HEADER),
+ supported_versions=', '.join(
+ map(str, _SUPPORTED_VERSIONS)))
+
+ def _set_protocol(self):
+ self._request.ws_protocol = None
+ # MOZILLA
+ self._request.sts = None
+ # /MOZILLA
+
+ protocol_header = self._request.headers_in.get(
+ common.SEC_WEBSOCKET_PROTOCOL_HEADER)
+
+ if protocol_header is None:
+ self._request.ws_requested_protocols = None
+ return
+
+ self._request.ws_requested_protocols = parse_token_list(
+ protocol_header)
+ self._logger.debug('Subprotocols requested: %r',
+ self._request.ws_requested_protocols)
+
+ def _parse_extensions(self):
+ extensions_header = self._request.headers_in.get(
+ common.SEC_WEBSOCKET_EXTENSIONS_HEADER)
+ if not extensions_header:
+ self._request.ws_requested_extensions = None
+ return
+
+ try:
+ self._request.ws_requested_extensions = common.parse_extensions(
+ extensions_header)
+ except common.ExtensionParsingException as e:
+ raise HandshakeException(
+ 'Failed to parse Sec-WebSocket-Extensions header: %r' % e)
+
+ self._logger.debug(
+ 'Extensions requested: %r',
+ list(
+ map(common.ExtensionParameter.name,
+ self._request.ws_requested_extensions)))
+
+ def _validate_key(self, key):
+ if key.find(',') >= 0:
+ raise HandshakeException('Request has multiple %s header lines or '
+ 'contains illegal character \',\': %r' %
+ (common.SEC_WEBSOCKET_KEY_HEADER, key))
+
+ # Validate
+ key_is_valid = False
+ try:
+ # Validate key by quick regex match before parsing by base64
+ # module. Because base64 module skips invalid characters, we have
+ # to do this in advance to make this server strictly reject illegal
+ # keys.
+ if _SEC_WEBSOCKET_KEY_REGEX.match(key):
+ decoded_key = base64.b64decode(key)
+ if len(decoded_key) == 16:
+ key_is_valid = True
+ except TypeError as e:
+ pass
+
+ if not key_is_valid:
+ raise HandshakeException('Illegal value for header %s: %r' %
+ (common.SEC_WEBSOCKET_KEY_HEADER, key))
+
+ return decoded_key
+
+ def _get_key(self):
+ key = get_mandatory_header(self._request,
+ common.SEC_WEBSOCKET_KEY_HEADER)
+
+ decoded_key = self._validate_key(key)
+
+ self._logger.debug('%s: %r (%s)', common.SEC_WEBSOCKET_KEY_HEADER, key,
+ util.hexify(decoded_key))
+
+ return key.encode('UTF-8')
+
+ def _create_stream(self, stream_options):
+ return Stream(self._request, stream_options)
+
+ def _create_handshake_response(self, accept):
+ response = []
+
+ response.append(u'HTTP/1.1 101 Switching Protocols\r\n')
+
+ # WebSocket headers
+ response.append(
+ format_header(common.UPGRADE_HEADER,
+ common.WEBSOCKET_UPGRADE_TYPE))
+ response.append(
+ format_header(common.CONNECTION_HEADER,
+ common.UPGRADE_CONNECTION_TYPE))
+ response.append(
+ format_header(common.SEC_WEBSOCKET_ACCEPT_HEADER,
+ accept.decode('UTF-8')))
+ if self._request.ws_protocol is not None:
+ response.append(
+ format_header(common.SEC_WEBSOCKET_PROTOCOL_HEADER,
+ self._request.ws_protocol))
+ if (self._request.ws_extensions is not None
+ and len(self._request.ws_extensions) != 0):
+ response.append(
+ format_header(
+ common.SEC_WEBSOCKET_EXTENSIONS_HEADER,
+ common.format_extensions(self._request.ws_extensions)))
+ # MOZILLA
+ if self._request.sts is not None:
+ response.append(format_header("Strict-Transport-Security",
+ self._request.sts))
+ # /MOZILLA
+
+ # Headers not specific for WebSocket
+ for name, value in self._request.extra_headers:
+ response.append(format_header(name, value))
+
+ response.append(u'\r\n')
+
+ return u''.join(response)
+
+ def _send_handshake(self, accept):
+ raw_response = self._create_handshake_response(accept)
+ self._request.connection.write(raw_response.encode('UTF-8'))
+ self._logger.debug('Sent server\'s opening handshake: %r',
+ raw_response)
+
+
+# vi:sts=4 sw=4 et