Diff

--- a/plugins/mod_privacy.lua	Sun Jan 24 05:36:25 2010 +0500
+++ b/plugins/mod_privacy.lua	Tue Jan 26 01:32:39 2010 +0500
@@ -1,31 +1,558 @@
 -- Prosody IM
 -- Copyright (C) 2008-2009 Matthew Wild
 -- Copyright (C) 2008-2009 Waqas Hussain
+-- Copyright (C) 2009 Thilo Cestonaro
 -- 
 -- This project is MIT/X11 licensed. Please see the
 -- COPYING file in the source package for more information.
 --
 
-
+local prosody = prosody;
 local st = require "util.stanza";
 local datamanager = require "util.datamanager";
+local bare_sessions = bare_sessions;
+local util_Jid = require "util.jid";
+local jid_bare = util_Jid.bare;
+local jid_split = util_Jid.split;
+local load_roster = require "core.rostermanager".load_roster;
+local to_number = _G.tonumber;
+
+function findNamedList (privacy_lists, name)
+	local ret = nil
+	if privacy_lists.lists == nil then
+		return nil;
+	end
+
+	for i=1, #privacy_lists.lists do
+		if privacy_lists.lists[i].name == name then
+			ret = i;
+			break;
+		end
+	end
+	return ret;
+end
+
+function isListUsed(origin, name, privacy_lists)	
+	if bare_sessions[origin.username.."@"..origin.host].sessions ~= nil then
+		for resource, session in pairs(bare_sessions[origin.username.."@"..origin.host].sessions) do
+			if resource ~= origin.resource then
+				if session.activePrivacyList == name then
+					return true;
+				elseif session.activePrivacyList == nil and privacy_lists.default == name then
+					return true;
+				end
+			end
+		end
+	end
+	return false;
+end
+
+function isAnotherSessionUsingDefaultList(origin)
+	local ret = false
+	if bare_sessions[origin.username.."@"..origin.host].sessions ~= nil then
+		for resource, session in pairs(bare_sessions[origin.username.."@"..origin.host].sessions) do
+			if resource ~= origin.resource and session.activePrivacyList == nil then
+				ret = true;
+				break;
+			end
+		end
+	end
+	return ret;
+end
+
+function sendUnavailable(to, from)
+--[[ example unavailable presence stanza
+<presence from="node@host/resource" type="unavailable" to="node@host" >
+	<status>Logged out</status>
+</presence>
+]]--
+	local presence = st.presence({from=from, type="unavailable"})
+	presence:tag("status"):text("Logged out");
+
+	local node, host = jid_bare(to);
+	local bare = node .. "@" .. host;
+	
+	if bare_sessions[bare].sessions ~= nil then
+		for resource, session in pairs(bare_sessions[bare].sessions) do
+			presence.attr.to = session.full_jid;
+			module:log("debug", "send unavailable to: %s; from: %s", tostring(presence.attr.to), tostring(presence.attr.from));
+			origin.send(presence);
+		end
+	end
+end
+
+function sendNeededUnavailablePersences(origin, listnameOrItem) -- TODO implement it correctly!
+	if type(listnameOrItem) == "string" then
+		local listname = listnameOrItem;
+		for _,list in ipairs(privacy_lists.lists) do
+			if list.name == listname then
+				for _,item in ipairs(list.items) do
+					sendNeededUnavailablePersences(origin, item);
+				end
+			end
+		end
+	elseif type(listnameOrItem) == "table" then
+		module:log("debug", "got an item, check wether to send unavailable presence stanza or not");
+		local item = listnameOrItem;
+		local serialize = require "util.serialization".serialize;
+
+
+		if item["presence-out"] == true then
+			if item.type == "jid" then
+				sendUnavailable(item.value, origin.full_jid);
+			elseif item.type == "group" then
+			elseif item.type == "subscription" then
+			elseif item.type == nil then
+			end
+		elseif item["presence-in"] == true then
+			if item.type == "jid" then
+				sendUnavailable(origin.full_jid, item.value);
+			elseif item.type == "group" then
+			elseif item.type == "subscription" then
+			elseif item.type == nil then
+			end		
+		end
+	else
+		module:log("debug", "got unknown type: %s", type(listnameOrItem));
+	end
+end
+
+function declineList (privacy_lists, origin, stanza, which)
+	if which == "default" then
+		if isAnotherSessionUsingDefaultList(origin) then
+			return { "cancel", "conflict", "Another session is online and using the default list."};
+		end
+		privacy_lists.default = nil;
+		origin.send(st.reply(stanza));
+	elseif which == "active" then
+		origin.activePrivacyList = nil;
+		origin.send(st.reply(stanza));
+	else
+		return {"modify", "bad-request", "Neither default nor active list specifed to decline."};
+	end
+	return true;
+end
+
+function activateList (privacy_lists, origin, stanza, which, name)
+	local idx = findNamedList(privacy_lists, name);
+
+	if privacy_lists.default == nil then
+		privacy_lists.default = "";
+	end
+	if origin.activePrivacyList == nil then
+		origin.activePrivacyList = "";
+	end
+	
+	if which == "default" and idx ~= nil then
+		if isAnotherSessionUsingDefaultList(origin) then
+			return {"cancel", "conflict", "Another session is online and using the default list."};
+		end
+		privacy_lists.default = name;
+		origin.send(st.reply(stanza));
+--[[
+		if origin.activePrivacyList == nil then
+			sendNeededUnavailablePersences(origin, name);
+		end
+]]--
+	elseif which == "active" and idx ~= nil then
+		origin.activePrivacyList = name;
+		origin.send(st.reply(stanza));
+		-- sendNeededUnavailablePersences(origin, name);
+	else
+		return {"modify", "bad-request", "Either not active or default given or unknown list name specified."};
+	end
+	return true;
+end
+
+function deleteList (privacy_lists, origin, stanza, name)
+	local idx = findNamedList(privacy_lists, name);
+
+	if idx ~= nil then
+		if isListUsed(origin, name, privacy_lists) then
+			return {"cancel", "conflict", "Another session is online and using the list which should be deleted."};
+		end
+		if privacy_lists.default == name then
+			privacy_lists.default = "";
+		end
+		if origin.activePrivacyList == name then
+			origin.activePrivacyList = "";
+		end
+		table.remove(privacy_lists.lists, idx);
+		origin.send(st.reply(stanza));
+		return true;
+	end
+	return {"modify", "bad-request", "Not existing list specifed to be deleted."};
+end
+
+local function sortByOrder(a, b)
+	if a.order < b.order then
+		return true;
+	end
+	return false;
+end
+
+function createOrReplaceList (privacy_lists, origin, stanza, name, entries, roster)
+	local idx = findNamedList(privacy_lists, name);
+	local bare_jid = origin.username.."@"..origin.host;
+	
+	if privacy_lists.lists == nil then
+		privacy_lists.lists = {};
+	end
+
+	if idx == nil then
+		idx = #privacy_lists.lists + 1;
+	end
+
+	local orderCheck = {};
+	local list = {};
+	list.name = name;
+	list.items = {};
+
+	for _,item in ipairs(entries) do
+		if to_number(item.attr.order) == nil or to_number(item.attr.order) < 0 or orderCheck[item.attr.order] ~= nil then
+			return {"modify", "bad-request", "Order attribute not valid."};
+		end
+		
+		if item.attr.type ~= nil and item.attr.type ~= "jid" and item.attr.type ~= "subscription" and item.attr.type ~= "group" then
+			return {"modify", "bad-request", "Type attribute not valid."};
+		end 
+		
+		local tmp = {};
+		orderCheck[item.attr.order] = true;
+		
+		tmp["type"] = item.attr.type;
+		tmp["value"] = item.attr.value;
+		tmp["action"] = item.attr.action;
+		tmp["order"] = to_number(item.attr.order);
+		tmp["presence-in"] = false;
+		tmp["presence-out"] = false;
+		tmp["message"] = false;
+		tmp["iq"] = false;
+		
+		if #item.tags > 0 then
+			for _,tag in ipairs(item.tags) do
+				tmp[tag.name] = true;
+			end
+		end
+		
+		if tmp.type == "group" then
+			local found = false;
+			local roster = load_roster(origin.username, origin.host);
+			for jid,item in pairs(roster) do
+				if item.groups ~= nil then
+					for group in pairs(item.groups) do
+						if group == tmp.value then
+							found = true;
+							break;
+						end
+					end
+					if found == true then
+						break;
+					end
+				end
+			end
+			if found == false then
+				return {"cancel", "item-not-found", "Specifed roster group not existing."};
+			end
+		elseif tmp.type == "subscription" then
+			if	tmp.value ~= "both" and
+				tmp.value ~= "to" and
+				tmp.value ~= "from" and
+				tmp.value ~= "none" then
+				return {"cancel", "bad-request", "Subscription value must be both, to, from or none."};
+			end
+		end
+		
+		if tmp.action ~= "deny" and tmp.action ~= "allow" then
+			return {"cancel", "bad-request", "Action must be either deny or allow."};
+		end
+		
+--[[		
+		if (privacy_lists.default == name and origin.activePrivacyList == nil) or origin.activePrivacyList == name then
+			module:log("debug", "calling sendNeededUnavailablePresences!");
+			-- item is valid and list is active, so send needed unavailable stanzas
+			sendNeededUnavailablePersences(origin, tmp);
+		end
+]]--
+		list.items[#list.items + 1] = tmp;
+	end
+	
+	table.sort(list, sortByOrder);
+
+	privacy_lists.lists[idx] = list;
+	origin.send(st.reply(stanza));
+	if bare_sessions[bare_jid] ~= nil then
+		iq = st.iq ( { type = "set", id="push1" } );
+		iq:tag ("query", { xmlns = "jabber:iq:privacy" } );
+		iq:tag ("list", { name = list.name } ):up();
+		iq:up();
+		for resource, session in pairs(bare_sessions[bare_jid].sessions) do
+			iq.attr.to = bare_jid.."/"..resource
+			session.send(iq);
+		end
+	else
+		return {"cancel", "bad-request", "internal error."};
+	end
+	return true;
+end
+
+function getList(privacy_lists, origin, stanza, name)
+	local reply = st.reply(stanza);
+	reply:tag("query", {xmlns="jabber:iq:privacy"});
+
+	if name == nil then
+		reply:tag("active", {name=origin.activePrivacyList or ""}):up();
+		reply:tag("default", {name=privacy_lists.default or ""}):up();
+		if privacy_lists.lists then
+			for _,list in ipairs(privacy_lists.lists) do
+				reply:tag("list", {name=list.name}):up();
+			end
+		end
+	else
+		local idx = findNamedList(privacy_lists, name);
+		if idx ~= nil then
+			list = privacy_lists.lists[idx];
+			reply = reply:tag("list", {name=list.name});
+			for _,item in ipairs(list.items) do
+				reply:tag("item", {type=item.type, value=item.value, action=item.action, order=item.order});
+				if item["message"] then reply:tag("message"):up(); end
+				if item["iq"] then reply:tag("iq"):up(); end
+				if item["presence-in"] then reply:tag("presence-in"):up(); end
+				if item["presence-out"] then reply:tag("presence-out"):up(); end
+				reply:up();
+			end
+		else
+			return {"cancel", "item-not-found", "Unknown list specified."};
+		end
+	end
+	
+	origin.send(reply);
+	return true;
+end
 
 module:hook("iq/bare/jabber:iq:privacy:query", function(data)
 	local origin, stanza = data.origin, data.stanza;
 	
-	if not stanza.attr.to then -- only service requests to own bare JID
+	if stanza.attr.to == nil then -- only service requests to own bare JID
 		local query = stanza.tags[1]; -- the query element
+		local valid = false;
 		local privacy_lists = datamanager.load(origin.username, origin.host, "privacy") or {};
+
 		if stanza.attr.type == "set" then
-			-- TODO
+			if #query.tags == 1 then --  the <query/> element MUST NOT include more than one child element 
+				for _,tag in ipairs(query.tags) do
+					if tag.name == "active" or tag.name == "default" then
+						if tag.attr.name == nil then -- Client declines the use of active / default list
+							valid = declineList(privacy_lists, origin, stanza, tag.name);
+						else -- Client requests change of active / default list
+							valid = activateList(privacy_lists, origin, stanza, tag.name, tag.attr.name);
+						end
+					elseif tag.name == "list" and tag.attr.name then -- Client adds / edits a privacy list
+						if #tag.tags == 0 then -- Client removes a privacy list
+							valid = deleteList(privacy_lists, origin, stanza, tag.attr.name);
+						else -- Client edits a privacy list
+							valid = createOrReplaceList(privacy_lists, origin, stanza, tag.attr.name, tag.tags);
+						end
+					end
+				end
+			end
 		elseif stanza.attr.type == "get" then
-			if #query.tags == 0 then -- Client requests names of privacy lists from server
-				-- TODO
-			elseif #query.tags == 1 and query.tags[1].name == "list" then -- Client requests a privacy list from server
-				-- TODO
-			else
-				origin.send(st.error_reply(stanza, "modify", "bad-request"));
+			local name = nil;
+			local listsToRetrieve = 0;
+			if #query.tags >= 1 then
+				for _,tag in ipairs(query.tags) do
+					if tag.name == "list" then -- Client requests a privacy list from server
+						name = tag.attr.name;
+						listsToRetrieve = listsToRetrieve + 1;
+					end
+				end
+			end
+			if listsToRetrieve == 0 or listsToRetrieve == 1 then
+				valid = getList(privacy_lists, origin, stanza, name);
+			end
+		end
+
+		if valid ~= true then
+			if valid[0] == nil then
+				valid[0] = "cancel";
+			end
+			if valid[1] == nil then
+				valid[1] = "bad-request";
+			end
+			origin.send(st.error_reply(stanza, valid[0], valid[1], valid[2]));
+		else
+			datamanager.store(origin.username, origin.host, "privacy", privacy_lists);
+		end
+		return true;
+	end
+	return false;
+end, 500);
+
+function checkIfNeedToBeBlocked(e, session)
+	local origin, stanza = e.origin, e.stanza;
+	local privacy_lists = datamanager.load(session.username, session.host, "privacy") or {};
+	local bare_jid = session.username.."@"..session.host;
+
+	module:log("debug", "stanza: %s, to: %s, from: %s", tostring(stanza.name), tostring(stanza.attr.to), tostring(stanza.attr.from));
+	
+	if stanza.attr.to ~= nil and stanza.attr.from ~= nil then
+		if privacy_lists.lists == nil or
+		   (session.activePrivacyList == nil or session.activePrivacyList == "") and
+		   (privacy_lists.default == nil     or privacy_lists.default == "")
+		then 
+			return; -- Nothing to block, default is Allow all
+		end
+	    if jid_bare(stanza.attr.from) == bare_jid and jid_bare(stanza.attr.to) == bare_jid then
+            module:log("debug", "Never block communications from one of a user's resources to another.");
+            return; -- from one of a user's resource to another => HANDS OFF!
+        end 
+
+		local idx;
+		local list;
+		local item;
+		local listname = session.activePrivacyList;
+		if listname == nil or listname == "" then
+			listname = privacy_lists.default; -- no active list selected, use default list
+		end
+		idx = findNamedList(privacy_lists, listname);
+		if idx == nil then
+			module:log("error", "given privacy listname not found. name: %s", listname);
+			return;
+		end
+		list = privacy_lists.lists[idx];
+		if list == nil then
+			module:log("info", "privacy list index wrong. index: %d", idx);
+			return;
+		end
+		for _,item in ipairs(list.items) do
+			local apply = false;
+			local block = false;
+			if (
+				(stanza.name == "message" and item.message) or
+				(stanza.name == "iq" and item.iq) or
+				(stanza.name == "presence" and jid_bare(stanza.attr.to) == bare_jid and item["presence-in"]) or
+				(stanza.name == "presence" and jid_bare(stanza.attr.from) == bare_jid and item["presence-out"]) or
+				(item.message == false and item.iq == false and item["presence-in"] == false and item["presence-in"] == false)
+			) then
+				apply = true;
+			end
+			if apply then
+				local evilJid = {};
+				apply = false;
+				if jid_bare(stanza.attr.to) == bare_jid then
+					module:log("debug", "evil jid is (from): %s", stanza.attr.from);
+					evilJid.node, evilJid.host, evilJid.resource = jid_split(stanza.attr.from);
+				else
+					module:log("debug", "evil jid is (to): %s", stanza.attr.to);
+					evilJid.node, evilJid.host, evilJid.resource = jid_split(stanza.attr.to);
+				end
+				if	item.type == "jid" and 
+					(evilJid.node and evilJid.host and evilJid.resource and item.value == evilJid.node.."@"..evilJid.host.."/"..evilJid.resource) or
+					(evilJid.node and evilJid.host and item.value == evilJid.node.."@"..evilJid.host) or
+					(evilJid.host and evilJid.resource and item.value == evilJid.host.."/"..evilJid.resource) or
+					(evilJid.host and item.value == evilJid.host) then
+					apply = true;
+					block = (item.action == "deny");
+				elseif item.type == "group" then
+					local roster = load_roster(session.username, session.host);
+					local groups = roster[evilJid.node .. "@" .. evilJid.host].groups;
+					for group in pairs(groups) do
+						if group == item.value then
+							apply = true;
+							block = (item.action == "deny");
+							break;
+						end
+					end
+				elseif item.type == "subscription" and evilJid.node ~= nil and evilJid.host ~= nil then -- we need a valid bare evil jid
+					local roster = load_roster(session.username, session.host);
+					if roster[evilJid.node .. "@" .. evilJid.host].subscription == item.value then
+						apply = true;
+						block = (item.action == "deny");
+					end
+				elseif item.type == nil then
+					apply = true;
+					block = (item.action == "deny");
+				end
+			end
+			if apply then
+				if block then
+					module:log("info", "stanza blocked: %s, to: %s, from: %s", tostring(stanza.name), tostring(stanza.attr.to), tostring(stanza.attr.from));
+					if stanza.name == "message" then
+						origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
+					elseif stanza.name == "iq" and (stanza.attr.type == "get" or stanza.attr.type == "set") then
+						origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
+					end
+					return true; -- stanza blocked !
+				else
+					module:log("info", "stanza explicit allowed!")
+					return;
+				end
 			end
 		end
 	end
-end);
+	return;
+end
+
+function preCheckIncoming(e)
+	local session;
+	if e.stanza.attr.to ~= nil then
+		local node, host, resource = jid_split(e.stanza.attr.to);
+		if node == nil or host == nil then
+			return;
+		end
+		if resource == nil then
+			local prio = 0;
+			local session_;
+			if bare_sessions[node.."@"..host] ~= nil then
+				for resource, session_ in pairs(bare_sessions[node.."@"..host].sessions) do
+					if session_.priority ~= nil and session_.priority > prio then
+						session = session_;
+						prio = session_.priority;
+					end
+				end
+			end
+		else
+			session = full_sessions[node.."@"..host.."/"..resource];
+		end
+		if session ~= nil then
+			return checkIfNeedToBeBlocked(e, session);
+		else
+			module:log("debug", "preCheckIncoming: Couldn't get session for jid: %s@%s/%s", tostring(node), tostring(host), tostring(resource))
+		end
+	end
+	return;
+end
+
+function preCheckOutgoing(e)
+	local session = e.origin;
+	if e.stanza.attr.from == nil then
+		e.stanza.attr.from = session.username .. "@" .. session.host;
+		if session.resource ~= nil then
+		 	e.stanza.attr.from = e.stanza.attr.from .. "/" .. session.resource;
+		end
+	end
+	return checkIfNeedToBeBlocked(e, session);
+end
+
+
+module:hook("pre-message/full", preCheckOutgoing, 500);
+module:hook("pre-message/bare", preCheckOutgoing, 500);
+module:hook("pre-message/host", preCheckOutgoing, 500);
+module:hook("pre-iq/full", preCheckOutgoing, 500);
+module:hook("pre-iq/bare", preCheckOutgoing, 500);
+module:hook("pre-iq/host", preCheckOutgoing, 500);
+module:hook("pre-presence/full", preCheckOutgoing, 500);
+module:hook("pre-presence/bare", preCheckOutgoing, 500);
+module:hook("pre-presence/host", preCheckOutgoing, 500);
+
+module:hook("message/full", preCheckIncoming, 500);
+module:hook("message/bare", preCheckIncoming, 500);
+module:hook("message/host", preCheckIncoming, 500);
+module:hook("iq/full", preCheckIncoming, 500);
+module:hook("iq/bare", preCheckIncoming, 500);
+module:hook("iq/host", preCheckIncoming, 500);
+module:hook("presence/full", preCheckIncoming, 500);
+module:hook("presence/bare", preCheckIncoming, 500);
+module:hook("presence/host", preCheckIncoming, 500);
+
+module:log("info", "mod_privacy loaded ...");