-- 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, full_sessions = bare_sessions, full_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 = tonumber; function findNamedList(privacy_lists, name) if privacy_lists.lists then for i=1,#privacy_lists.lists do if privacy_lists.lists[i].name == name then return i; end end end end function isListUsed(origin, name, privacy_lists) local user = bare_sessions[origin.username.."@"..origin.host]; if user then for resource, session in pairs(user.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 end function isAnotherSessionUsingDefaultList(origin) local user = bare_sessions[origin.username.."@"..origin.host]; if user then for resource, session in pairs(user.sessions) do if resource ~= origin.resource and session.activePrivacyList == nil then return true; end end end end function sendUnavailable(origin, 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; local user = bare_sessions[bare]; if user then for resource, session in pairs(user.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; if item["presence-out"] == true then if item.type == "jid" then sendUnavailable(origin, 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, 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 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, function(a, b) return a.order < b.order; end); privacy_lists.lists[idx] = list; origin.send(st.reply(stanza)); if bare_sessions[bare_jid] ~= nil then local 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 local 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 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 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 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 end); 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-out"] == 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 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 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);