Mercurial > prosody-modules

view mod_http_prebind/mod_http_prebind.lua @ 5193:2bb29ece216b

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
mod_http_oauth2: Implement stateless dynamic client registration Replaces previous explicit registration that required either the additional module mod_adhoc_oauth2_client or manually editing the database. That method was enough to have something to test with, but would not probably not scale easily. Dynamic client registration allows creating clients on the fly, which may be even easier in theory. In order to not allow basically unauthenticated writes to the database, we implement a stateless model here. per_host_key := HMAC(config -> oauth2_registration_key, hostname) client_id := JWT { client metadata } signed with per_host_key client_secret := HMAC(per_host_key, client_id) This should ensure everything we need to know is part of the client_id, allowing redirects etc to be validated, and the client_secret can be validated with only the client_id and the per_host_key. A nonce injected into the client_id JWT should ensure nobody can submit the same client metadata and retrieve the same client_secret
author Kim Alvefur <zash@zash.se>
date Fri, 03 Mar 2023 21:14:19 +0100
parents 495a23d61418
children
line wrap: on
line source

module:depends("http");

local http = require "net.http";
local format = require "util.format".format;
local json_encode = require "util.json".encode;
local promise = require "util.promise";
local xml = require "util.xml";
local t_insert = table.insert;

local function new_options(host)
	return {
		headers = {
			["Content-Type"] = "text/xml; charset=utf-8",
			["Host"] = host,
		},
		method = "POST",
	};
end

local function connect_to_bosh(url, hostname)
	local rid = math.random(100000, 100000000)
	local options = new_options(hostname);
	options.body = format([[<body content='text/xml; charset=utf-8'
	      hold='1'
	      rid='%d'
	      to='%s'
	      wait='60'
	      xml:lang='en'
	      xmpp:version='1.0'
	      xmlns='http://jabber.org/protocol/httpbind'
	      xmlns:xmpp='urn:xmpp:xbosh'/>]], rid, hostname);
	local rid = rid + 1;
	return promise.new(function (on_fulfilled, on_error)
		assert(http.request(url, options, function (body, code)
			if code ~= 200 then
				on_error("Failed to fetch, HTTP error code "..code);
				return;
			end
			local body = xml.parse(body);
			local sid = body.attr.sid;
			local mechanisms = {};
			for mechanism in body:get_child("features", "http://etherx.jabber.org/streams")
				:get_child("mechanisms", "urn:ietf:params:xml:ns:xmpp-sasl")
					:childtags("mechanism", "urn:ietf:params:xml:ns:xmpp-sasl") do
				mechanisms[mechanism:get_text()] = true;
			end
			on_fulfilled({ url = url, sid = sid, rid = rid, mechanisms = mechanisms });
		end));
	end);
end

local function authenticate(data)
	local options = new_options();
	options.body = format([[<body sid='%s'
	      rid='%d'
	      xmlns='http://jabber.org/protocol/httpbind'>
		<auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl'
		      mechanism='ANONYMOUS'/>
	</body>]], data.sid, data.rid);
	data.rid = data.rid + 1;
	return promise.new(function (on_fulfilled, on_error)
		if data.mechanisms["ANONYMOUS"] == nil then
			on_error("No SASL ANONYMOUS mechanism supported on this host.");
			return;
		end
		assert(http.request(data.url, options, function (body, code)
			if code ~= 200 then
				on_error("Failed to fetch, HTTP error code "..code);
				return;
			end
			local body = xml.parse(body);
			local success = body:get_child("success", "urn:ietf:params:xml:ns:xmpp-sasl");
			if success then
				data.mechanisms = nil;
				on_fulfilled(data);
			else
				on_error("Authentication failed.");
			end
		end));
	end);
end;

local function restart_stream(data)
	local options = new_options();
	options.body = format([[
	<body sid='%s'
	      rid='%d'
	      xml:lang='en'
	      xmlns='http://jabber.org/protocol/httpbind'
	      xmlns:xmpp='urn:xmpp:xbosh'
	      xmpp:restart='true'/>]], data.sid, data.rid);
	data.rid = data.rid + 1;
	return promise.new(function (on_fulfilled, on_error)
		assert(http.request(data.url, options, function (body, code)
			if code ~= 200 then
				on_error("Failed to fetch, HTTP error code "..code);
				return;
			end
			local body = xml.parse(body);
			on_fulfilled(data);
		end));
	end);
end;

local function bind(data)
	local options = new_options();
	options.body = format([[
	<body sid='%s'
	      rid='%d'
	      xmlns='http://jabber.org/protocol/httpbind'>
		<iq xmlns='jabber:client'
		    type='set'>
			<bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'/>
		</iq>
	</body>]], data.sid, data.rid);
	data.rid = data.rid + 1;
	return promise.new(function (on_fulfilled, on_error)
		assert(http.request(data.url, options, function (body, code)
			if code ~= 200 then
				on_error("Failed to fetch, HTTP error code "..code);
				return;
			end
			local body = xml.parse(body);
			local jid = body:get_child("iq", "jabber:client")
				:get_child("bind", "urn:ietf:params:xml:ns:xmpp-bind")
					:get_child_text("jid", "urn:ietf:params:xml:ns:xmpp-bind");
			on_fulfilled(json_encode({rid = data.rid, sid = data.sid, jid = jid}));
		end));
	end);
end;

module:provides("http", {
	route = {
		["GET"] = function (event)
			return connect_to_bosh("http://[::1]:5280/http-bind", module.host)
				:next(authenticate)
				:next(restart_stream)
				:next(bind);
		end;
	};
});