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-rw-r--r--net/websocket.lua83
-rw-r--r--net/websocket/frames.lua19
-rw-r--r--plugins/mod_websocket.lua301
3 files changed, 354 insertions, 49 deletions
diff --git a/net/websocket.lua b/net/websocket.lua
index 32bb1a6e..3c4746b7 100644
--- a/net/websocket.lua
+++ b/net/websocket.lua
@@ -6,6 +6,8 @@
-- COPYING file in the source package for more information.
--
+local t_concat = table.concat;
+
local http = require "net.http";
local frames = require "net.websocket.frames";
local base64 = require "util.encodings".base64;
@@ -76,7 +78,7 @@ function websocket_listeners.onincoming(handler, buffer, err)
if frame.FIN then
s.databuffer = nil;
if s.onmessage then
- s:onmessage(table.concat(databuffer), databuffer.type);
+ s:onmessage(t_concat(databuffer), databuffer.type);
end
end
else -- Control frame
@@ -176,28 +178,31 @@ local websocket_metatable = {
local function connect(url, ex, listeners)
ex = ex or {};
- --[[ RFC 6455 4.1.7:
+ --[[RFC 6455 4.1.7:
The request MUST include a header field with the name
- |Sec-WebSocket-Key|. The value of this header field MUST be a
- nonce consisting of a randomly selected 16-byte value that has
- been base64-encoded (see Section 4 of [RFC4648]). The nonce
- MUST be selected randomly for each connection.
- ]]
+ |Sec-WebSocket-Key|. The value of this header field MUST be a
+ nonce consisting of a randomly selected 16-byte value that has
+ been base64-encoded (see Section 4 of [RFC4648]). The nonce
+ MUST be selected randomly for each connection.
+ ]]
local key = base64.encode(random_bytes(16));
-- Either a single protocol string or an array of protocol strings.
local protocol = ex.protocol;
- if type(protocol) == "table" then
- protocol = table.concat(protocol, ", ");
+ if type(protocol) == "string" then
+ protocol = { protocol };
+ end
+ for _, v in ipairs(protocol) do
+ protocol[v] = true;
end
local headers = {
["Upgrade"] = "websocket";
["Connection"] = "Upgrade";
["Sec-WebSocket-Key"] = key;
- ["Sec-WebSocket-Protocol"] = protocol;
- ["Sec-WebSocket-Version"] = "13";
- ["Sec-WebSocket-Extensions"] = ex.extensions;
+ ["Sec-WebSocket-Protocol"] = t_concat(protocol, ", ");
+ ["Sec-WebSocket-Version"] = "13";
+ ["Sec-WebSocket-Extensions"] = ex.extensions;
}
if ex.headers then
for k,v in pairs(ex.headers) do
@@ -225,36 +230,36 @@ local function connect(url, ex, listeners)
local http_url = url:gsub("^(ws)", "http");
local http_req = http.request(http_url, {
- method = "GET";
- headers = headers;
- sslctx = ex.sslctx;
- }, function(b, c, r, http_req)
- if c ~= 101
- or r.headers["connection"]:lower() ~= "upgrade"
- or r.headers["upgrade"] ~= "websocket"
- or r.headers["sec-websocket-accept"] ~= base64.encode(sha1(key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"))
- -- TODO: check "Sec-WebSocket-Protocol"
- then
- s.readyState = 3;
- log("warn", "WebSocket connection to %s failed: %s", url, tostring(b));
- if s.onerror then s:onerror("connecting-failed"); end
- return
- end
+ method = "GET";
+ headers = headers;
+ sslctx = ex.sslctx;
+ }, function(b, c, r, http_req)
+ if c ~= 101
+ or r.headers["connection"]:lower() ~= "upgrade"
+ or r.headers["upgrade"] ~= "websocket"
+ or r.headers["sec-websocket-accept"] ~= base64.encode(sha1(key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"))
+ or not protocol[r.headers["sec-websocket-protocol"]]
+ then
+ s.readyState = 3;
+ log("warn", "WebSocket connection to %s failed: %s", url, tostring(b));
+ if s.onerror then s:onerror("connecting-failed"); end
+ return;
+ end
- s.protocol = r.headers["sec-websocket-protocol"];
+ s.protocol = r.headers["sec-websocket-protocol"];
- -- Take possession of socket from http
- http_req.conn = nil;
- local handler = http_req.handler;
- s.handler = handler;
- websockets[handler] = s;
- handler:setlistener(websocket_listeners);
+ -- Take possession of socket from http
+ http_req.conn = nil;
+ local handler = http_req.handler;
+ s.handler = handler;
+ websockets[handler] = s;
+ handler:setlistener(websocket_listeners);
- log("debug", "WebSocket connected successfully to %s", url);
- s.readyState = 1;
- if s.onopen then s:onopen(); end
- websocket_listeners.onincoming(handler, b);
- end);
+ log("debug", "WebSocket connected successfully to %s", url);
+ s.readyState = 1;
+ if s.onopen then s:onopen(); end
+ websocket_listeners.onincoming(handler, b);
+ end);
return s;
end
diff --git a/net/websocket/frames.lua b/net/websocket/frames.lua
index a5fcdad9..8bbddd1c 100644
--- a/net/websocket/frames.lua
+++ b/net/websocket/frames.lua
@@ -29,7 +29,7 @@ local function read_uint16be(str, pos)
local l1, l2 = s_byte(str, pos, pos+1);
return l1*256 + l2;
end
--- TODO: this may lose precision
+-- FIXME: this may lose precision
local function read_uint64be(str, pos)
local l1, l2, l3, l4, l5, l6, l7, l8 = s_byte(str, pos, pos+7);
return lshift(l1, 56) + lshift(l2, 48) + lshift(l3, 40) + lshift(l4, 32)
@@ -38,12 +38,12 @@ end
local function pack_uint16be(x)
return s_char(rshift(x, 8), band(x, 0xFF));
end
-local function sm(x, n)
+local function get_byte(x, n)
return band(rshift(x, n), 0xFF);
end
local function pack_uint64be(x)
- return s_char(rshift(x, 56), sm(x, 48), sm(x, 40), sm(x, 32),
- sm(x, 24), sm(x, 16), sm(x, 8), band(x, 0xFF));
+ return s_char(rshift(x, 56), get_byte(x, 48), get_byte(x, 40), get_byte(x, 32),
+ get_byte(x, 24), get_byte(x, 16), get_byte(x, 8), band(x, 0xFF));
end
local function parse_frame_header(frame)
@@ -78,7 +78,7 @@ local function parse_frame_header(frame)
end
if result.MASK then
- result.key = { s_byte(frame, pos+1, pos+4) };
+ result.key = { s_byte(frame, length_bytes+3, length_bytes+6) };
end
return result, header_length;
@@ -131,13 +131,12 @@ local function build_frame(desc)
desc.RSV1 and 0x40 or 0,
desc.RSV2 and 0x20 or 0,
desc.RSV3 and 0x10 or 0);
- local b2;
- local length_extra
- if #data <= 125 then -- 7-bit length
- b2 = #data;
+ local b2 = #data;
+ local length_extra;
+ if b2 <= 125 then -- 7-bit length
length_extra = "";
- elseif #data <= 0xFFFF then -- 2-byte length
+ elseif b2 <= 0xFFFF then -- 2-byte length
b2 = 126;
length_extra = pack_uint16be(#data);
else -- 8-byte length
diff --git a/plugins/mod_websocket.lua b/plugins/mod_websocket.lua
new file mode 100644
index 00000000..313dbd41
--- /dev/null
+++ b/plugins/mod_websocket.lua
@@ -0,0 +1,301 @@
+-- Prosody IM
+-- Copyright (C) 2012-2014 Florian Zeitz
+--
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
+--
+
+module:set_global();
+
+local add_filter = require "util.filters".add_filter;
+local sha1 = require "util.hashes".sha1;
+local base64 = require "util.encodings".base64.encode;
+local st = require "util.stanza";
+local parse_xml = require "util.xml".parse;
+local portmanager = require "core.portmanager";
+local sm_destroy_session = sessionmanager.destroy_session;
+local log = module._log;
+
+local websocket_frames = require"net.websocket.frames";
+local parse_frame = websocket_frames.parse;
+local build_frame = websocket_frames.build;
+local build_close = websocket_frames.build_close;
+local parse_close = websocket_frames.parse_close;
+
+local t_concat = table.concat;
+
+local consider_websocket_secure = module:get_option_boolean("consider_websocket_secure");
+local cross_domain = module:get_option("cross_domain_websocket");
+if cross_domain then
+ if cross_domain == true then
+ cross_domain = "*";
+ elseif type(cross_domain) == "table" then
+ cross_domain = t_concat(cross_domain, ", ");
+ end
+ if type(cross_domain) ~= "string" then
+ cross_domain = nil;
+ end
+end
+
+local xmlns_framing = "urn:ietf:params:xml:ns:xmpp-framing";
+local xmlns_streams = "http://etherx.jabber.org/streams";
+local xmlns_client = "jabber:client";
+local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
+
+module:depends("c2s")
+local sessions = module:shared("c2s/sessions");
+local c2s_listener = portmanager.get_service("c2s").listener;
+
+--- Session methods
+local function session_open_stream(session)
+ local attr = {
+ xmlns = xmlns_framing,
+ version = "1.0",
+ id = session.streamid or "",
+ from = session.host
+ };
+ session.send(st.stanza("open", attr));
+end
+
+local function session_close(session, reason)
+ local log = session.log or log;
+ if session.conn then
+ if session.notopen then
+ session:open_stream();
+ end
+ if reason then -- nil == no err, initiated by us, false == initiated by client
+ local stream_error = st.stanza("stream:error");
+ if type(reason) == "string" then -- assume stream error
+ stream_error:tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' });
+ elseif type(reason) == "table" then
+ if reason.condition then
+ stream_error:tag(reason.condition, stream_xmlns_attr):up();
+ if reason.text then
+ stream_error:tag("text", stream_xmlns_attr):text(reason.text):up();
+ end
+ if reason.extra then
+ stream_error:add_child(reason.extra);
+ end
+ elseif reason.name then -- a stanza
+ stream_error = reason;
+ end
+ end
+ log("debug", "Disconnecting client, <stream:error> is: %s", tostring(stream_error));
+ session.send(stream_error);
+ end
+
+ session.send(st.stanza("close", { xmlns = xmlns_framing }));
+ function session.send() return false; end
+
+ local reason = (reason and (reason.name or reason.text or reason.condition)) or reason;
+ session.log("debug", "c2s stream for %s closed: %s", session.full_jid or ("<"..session.ip..">"), reason or "session closed");
+
+ -- Authenticated incoming stream may still be sending us stanzas, so wait for </stream:stream> from remote
+ local conn = session.conn;
+ if reason == nil and not session.notopen and session.type == "c2s" then
+ -- Grace time to process data from authenticated cleanly-closed stream
+ add_task(stream_close_timeout, function ()
+ if not session.destroyed then
+ session.log("warn", "Failed to receive a stream close response, closing connection anyway...");
+ sm_destroy_session(session, reason);
+ conn:write(build_close(1000, "Stream closed"));
+ conn:close();
+ end
+ end);
+ else
+ sm_destroy_session(session, reason);
+ conn:write(build_close(1000, "Stream closed"));
+ conn:close();
+ end
+ end
+end
+
+
+--- Filters
+local function filter_open_close(data)
+ if not data:find(xmlns_framing, 1, true) then return data; end
+
+ local oc = parse_xml(data);
+ if not oc then return data; end
+ if oc.attr.xmlns ~= xmlns_framing then return data; end
+ if oc.name == "close" then return "</stream:stream>"; end
+ if oc.name == "open" then
+ oc.name = "stream:stream";
+ oc.attr.xmlns = nil;
+ oc.attr["xmlns:stream"] = xmlns_streams;
+ return oc:top_tag();
+ end
+
+ return data;
+end
+function handle_request(event, path)
+ local request, response = event.request, event.response;
+ local conn = response.conn;
+
+ if not request.headers.sec_websocket_key then
+ response.headers.content_type = "text/html";
+ return [[<!DOCTYPE html><html><head><title>Websocket</title></head><body>
+ <p>It works! Now point your WebSocket client to this URL to connect to Prosody.</p>
+ </body></html>]];
+ end
+
+ local wants_xmpp = false;
+ (request.headers.sec_websocket_protocol or ""):gsub("([^,]*),?", function (proto)
+ if proto == "xmpp" then wants_xmpp = true; end
+ end);
+
+ if not wants_xmpp then
+ return 501;
+ end
+
+ local function websocket_close(code, message)
+ conn:write(build_close(code, message));
+ conn:close();
+ end
+
+ local dataBuffer;
+ local function handle_frame(frame)
+ local opcode = frame.opcode;
+ local length = frame.length;
+ module:log("debug", "Websocket received frame: opcode=%0x, %i bytes", frame.opcode, #frame.data);
+
+ -- Error cases
+ if frame.RSV1 or frame.RSV2 or frame.RSV3 then -- Reserved bits non zero
+ websocket_close(1002, "Reserved bits not zero");
+ return false;
+ end
+
+ if opcode == 0x8 then -- close frame
+ if length == 1 then
+ websocket_close(1002, "Close frame with payload, but too short for status code");
+ return false;
+ elseif length >= 2 then
+ local status_code = parse_close(frame.data)
+ if status_code < 1000 then
+ websocket_close(1002, "Closed with invalid status code");
+ return false;
+ elseif ((status_code > 1003 and status_code < 1007) or status_code > 1011) and status_code < 3000 then
+ websocket_close(1002, "Closed with reserved status code");
+ return false;
+ end
+ end
+ end
+
+ if opcode >= 0x8 then
+ if length > 125 then -- Control frame with too much payload
+ websocket_close(1002, "Payload too large");
+ return false;
+ end
+
+ if not frame.FIN then -- Fragmented control frame
+ websocket_close(1002, "Fragmented control frame");
+ return false;
+ end
+ end
+
+ if (opcode > 0x2 and opcode < 0x8) or (opcode > 0xA) then
+ websocket_close(1002, "Reserved opcode");
+ return false;
+ end
+
+ if opcode == 0x0 and not dataBuffer then
+ websocket_close(1002, "Unexpected continuation frame");
+ return false;
+ end
+
+ if (opcode == 0x1 or opcode == 0x2) and dataBuffer then
+ websocket_close(1002, "Continuation frame expected");
+ return false;
+ end
+
+ -- Valid cases
+ if opcode == 0x0 then -- Continuation frame
+ dataBuffer[#dataBuffer+1] = frame.data;
+ elseif opcode == 0x1 then -- Text frame
+ dataBuffer = {frame.data};
+ elseif opcode == 0x2 then -- Binary frame
+ websocket_close(1003, "Only text frames are supported");
+ return;
+ elseif opcode == 0x8 then -- Close request
+ websocket_close(1000, "Goodbye");
+ return;
+ elseif opcode == 0x9 then -- Ping frame
+ frame.opcode = 0xA;
+ conn:write(build_frame(frame));
+ return "";
+ elseif opcode == 0xA then -- Pong frame
+ module:log("warn", "Received unexpected pong frame: " .. tostring(frame.data));
+ return "";
+ else
+ log("warn", "Received frame with unsupported opcode %i", opcode);
+ return "";
+ end
+
+ if frame.FIN then
+ local data = t_concat(dataBuffer, "");
+ dataBuffer = nil;
+ return data;
+ end
+ return "";
+ end
+
+ conn:setlistener(c2s_listener);
+ c2s_listener.onconnect(conn);
+
+ local session = sessions[conn];
+
+ session.secure = consider_websocket_secure or session.secure;
+
+ session.open_stream = session_open_stream;
+ session.close = session_close;
+
+ local frameBuffer = "";
+ add_filter(session, "bytes/in", function(data)
+ local cache = {};
+ frameBuffer = frameBuffer .. data;
+ local frame, length = parse_frame(frameBuffer);
+
+ while frame do
+ frameBuffer = frameBuffer:sub(length + 1);
+ local result = handle_frame(frame);
+ if not result then return; end
+ cache[#cache+1] = filter_open_close(result);
+ frame, length = parse_frame(frameBuffer);
+ end
+ return t_concat(cache, "");
+ end);
+
+ add_filter(session, "stanzas/out", function(stanza)
+ local attr = stanza.attr;
+ attr.xmlns = attr.xmlns or xmlns_client;
+ if stanza.name:find("^stream:") then
+ attr["xmlns:stream"] = attr["xmlns:stream"] or xmlns_streams;
+ end
+ return stanza;
+ end);
+
+ add_filter(session, "bytes/out", function(data)
+ return build_frame({ FIN = true, opcode = 0x01, data = tostring(data)});
+ end);
+
+ response.status_code = 101;
+ response.headers.upgrade = "websocket";
+ response.headers.connection = "Upgrade";
+ response.headers.sec_webSocket_accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"));
+ response.headers.sec_webSocket_protocol = "xmpp";
+ response.headers.access_control_allow_origin = cross_domain;
+
+ return "";
+end
+
+function module.add_host(module)
+ module:depends("http");
+ module:provides("http", {
+ name = "websocket";
+ default_path = "xmpp-websocket";
+ route = {
+ ["GET"] = handle_request;
+ ["GET /"] = handle_request;
+ };
+ });
+end
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