-- Prosody IM -- Copyright (C) 2009-2010 Matthew Wild -- Copyright (C) 2009-2010 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. -- module:add_feature("jabber:iq:privacy"); local st = require "util.stanza"; local bare_sessions, full_sessions = prosody.bare_sessions, prosody.full_sessions; local util_Jid = require "util.jid"; local jid_bare = util_Jid.bare; local jid_split, jid_join = util_Jid.split, util_Jid.join; local load_roster = require "core.rostermanager".load_roster; local to_number = tonumber; local privacy_storage = module:open_store(); 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 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 list = privacy_lists.lists[name]; if which == "default" and list 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)); elseif which == "active" and list then origin.activePrivacyList = name; origin.send(st.reply(stanza)); elseif not list then return {"cancel", "item-not-found", "No such list: "..name}; else return {"modify", "bad-request", "No list chosen to be active or default."}; end return true; end function deleteList(privacy_lists, origin, stanza, name) local list = privacy_lists.lists[name]; if list 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 = nil; end if origin.activePrivacyList == name then origin.activePrivacyList = nil; end privacy_lists.lists[name] = nil; 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) local bare_jid = origin.username.."@"..origin.host; if privacy_lists.lists == nil then privacy_lists.lists = {}; end local list = {}; privacy_lists.lists[name] = list; local orderCheck = {}; 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 == "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 list.items[#list.items + 1] = tmp; end table.sort(list.items, function(a, b) return a.order < b.order; end); 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 if privacy_lists.lists then if origin.activePrivacyList then reply:tag("active", {name=origin.activePrivacyList}):up(); end if privacy_lists.default then reply:tag("default", {name=privacy_lists.default}):up(); end for name,list in pairs(privacy_lists.lists) do reply:tag("list", {name=name}):up(); end end else local list = privacy_lists.lists[name]; if list then 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 = privacy_storage:get(origin.username) or { lists = {} }; if privacy_lists.lists[1] then -- Code to migrate from old privacy lists format, remove in 0.8 module:log("info", "Upgrading format of stored privacy lists for %s@%s", origin.username, origin.host); local lists = privacy_lists.lists; for idx, list in ipairs(lists) do lists[list.name] = list; lists[idx] = nil; end end 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 valid = valid or { "cancel", "bad-request", "Couldn't understand request" }; if valid[1] == nil then valid[1] = "cancel"; end if valid[2] == nil then valid[2] = "bad-request"; end origin.send(st.error_reply(stanza, valid[1], valid[2], valid[3])); else privacy_storage:set(origin.username, privacy_lists); end return true; end end); function checkIfNeedToBeBlocked(e, session) local origin, stanza = e.origin, e.stanza; local privacy_lists = privacy_storage:get(session.username) or {}; local bare_jid = session.username.."@"..session.host; local to = stanza.attr.to or bare_jid; local from = stanza.attr.from; local is_to_user = bare_jid == jid_bare(to); local is_from_user = bare_jid == jid_bare(from); --module:log("debug", "stanza: %s, to: %s, from: %s", tostring(stanza.name), tostring(to), tostring(from)); if privacy_lists.lists == nil or not (session.activePrivacyList or privacy_lists.default) then return; -- Nothing to block, default is Allow all end if is_from_user and is_to_user then --module:log("debug", "Not blocking communications between user's resources"); return; -- from one of a user's resource to another => HANDS OFF! end local listname = session.activePrivacyList; if listname == nil then listname = privacy_lists.default; -- no active list selected, use default list end local list = privacy_lists.lists[listname]; if not list then -- should never happen module:log("warn", "given privacy list not found. name: %s for user %s", listname, bare_jid); 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 is_to_user and item["presence-in"]) or (stanza.name == "presence" and is_from_user 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 is_to_user then --module:log("debug", "evil jid is (from): %s", from); evilJid.node, evilJid.host, evilJid.resource = jid_split(from); else --module:log("debug", "evil jid is (to): %s", to); evilJid.node, evilJid.host, evilJid.resource = jid_split(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 roster_entry = roster[jid_join(evilJid.node, evilJid.host)]; if roster_entry then local groups = roster_entry.groups; for group in pairs(groups) do if group == item.value then apply = true; block = (item.action == "deny"); break; end end end elseif item.type == "subscription" then -- we need a valid bare evil jid local roster = load_roster(session.username, session.host); local roster_entry = roster[jid_join(evilJid.node, evilJid.host)]; if (not(roster_entry) and item.value == "none") or (roster_entry and roster_entry.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 -- drop and not bounce groupchat messages, otherwise users will get kicked if stanza.attr.type == "groupchat" then return true; end module:log("debug", "stanza blocked: %s, to: %s, from: %s", tostring(stanza.name), tostring(to), tostring(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("debug", "stanza explicitly allowed!") return; 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; 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 if session.username then -- FIXME do properly return checkIfNeedToBeBlocked(e, session); end 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);