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view mod_privilege/mod_privilege.lua @ 3641:58b49d883f0c
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author | Kim Alvefur <zash@zash.se> |
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date | Fri, 09 Aug 2019 18:41:51 +0200 |
parents | 7454274ead2f |
children | 3ddab718f717 |
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-- XEP-0356 (Privileged Entity) -- Copyright (C) 2015-2016 Jérôme Poisson -- -- This module is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- -- Some parts come from mod_remote_roster (module by Waqas Hussain and Kim Alvefur, see https://code.google.com/p/prosody-modules/) -- TODO: manage external <presence/> (for "roster" presence permission) when the account with the roster is offline local jid = require("util.jid") local set = require("util.set") local st = require("util.stanza") local roster_manager = require("core.rostermanager") local usermanager_user_exists = require "core.usermanager".user_exists; local hosts = prosody.hosts local full_sessions = prosody.full_sessions; local priv_session = module:shared("/*/privilege/session") if priv_session.connected_cb == nil then -- set used to have connected event listeners -- which allows a host to react on events from -- other hosts priv_session.connected_cb = set.new() end local connected_cb = priv_session.connected_cb -- the folowing sets are used to forward presence stanza -- the folowing sets are used to forward presence stanza local presence_man_ent = set.new() local presence_roster = set.new() local _ALLOWED_ROSTER = set.new({'none', 'get', 'set', 'both'}) local _ROSTER_GET_PERM = set.new({'get', 'both'}) local _ROSTER_SET_PERM = set.new({'set', 'both'}) local _ALLOWED_MESSAGE = set.new({'none', 'outgoing'}) local _ALLOWED_PRESENCE = set.new({'none', 'managed_entity', 'roster'}) local _PRESENCE_MANAGED = set.new({'managed_entity', 'roster'}) local _TO_CHECK = {roster=_ALLOWED_ROSTER, message=_ALLOWED_MESSAGE, presence=_ALLOWED_PRESENCE} local _PRIV_ENT_NS = 'urn:xmpp:privilege:1' local _FORWARDED_NS = 'urn:xmpp:forward:0' local _MODULE_HOST = module:get_host() module:log("debug", "Loading privileged entity module "); --> Permissions management <-- local privileges = module:get_option("privileged_entities", {}) local function get_session_privileges(session, host) if not session.privileges then return nil end return session.privileges[host] end local function advertise_perm(session, to_jid, perms) -- send <message/> stanza to advertise permissions -- as expained in § 4.2 local message = st.message({from=module.host, to=to_jid}) :tag("privilege", {xmlns=_PRIV_ENT_NS}) for _, perm in pairs({'roster', 'message', 'presence'}) do if perms[perm] then message:tag("perm", {access=perm, type=perms[perm]}):up() end end session.send(message) end local function set_presence_perm_set(to_jid, perms) -- fill the presence sets according to perms if _PRESENCE_MANAGED:contains(perms.presence) then presence_man_ent:add(to_jid) end if perms.presence == 'roster' then presence_roster:add(to_jid) end end local function advertise_presences(session, to_jid, perms) -- send presence status for already conencted entities -- as explained in § 7.1 -- people in roster are probed only for active sessions -- TODO: manage roster load for inactive sessions if not perms.presence then return; end local to_probe = {} for _, user_session in pairs(full_sessions) do if user_session.presence and _PRESENCE_MANAGED:contains(perms.presence) then local presence = st.clone(user_session.presence) presence.attr.to = to_jid module:log("debug", "sending current presence for "..tostring(user_session.full_jid)) session.send(presence) end if perms.presence == "roster" then -- we reset the cache to avoid to miss a presence that just changed priv_session.last_presence = nil if user_session.roster then local bare_jid = jid.bare(user_session.full_jid) for entity, item in pairs(user_session.roster) do if entity~=false and entity~="pending" and (item.subscription=="both" or item.subscription=="to") then local _, host = jid.split(entity) if not hosts[host] then -- we don't probe jid from hosts we manage -- using a table with entity as key avoid probing several time the same one to_probe[entity] = bare_jid end end end end end end -- now we probe peoples for "roster" presence permission for probe_to, probe_from in pairs(to_probe) do module:log("debug", "probing presence for %s (on behalf of %s)", tostring(probe_to), tostring(probe_from)) local probe = st.presence({from=probe_from, to=probe_to, type="probe"}) prosody.core_route_stanza(nil, probe) end end local function on_auth(event) -- Check if entity is privileged according to configuration, -- and set session.privileges accordingly local session = event.session local bare_jid = jid.join(session.username, session.host) if not session.privileges then session.privileges = {} end local ent_priv = privileges[bare_jid] if ent_priv ~= nil then module:log("debug", "Entity is privileged") for perm_type, allowed_values in pairs(_TO_CHECK) do local value = ent_priv[perm_type] if value ~= nil then if not allowed_values:contains(value) then module:log('warn', 'Invalid value for '..perm_type..' privilege: ['..value..']') module:log('warn', 'Setting '..perm_type..' privilege to none') ent_priv[perm_type] = nil end if value == 'none' then ent_priv[perm_type] = nil end end end -- extra checks for presence permission if ent_priv.presence == 'roster' and not _ROSTER_GET_PERM:contains(ent_priv.roster) then module:log("warn", "Can't allow roster presence privilege without roster \"get\" privilege") module:log("warn", "Setting presence permission to none") ent_priv.presence = nil end if session.type == "component" then -- we send the message stanza only for component -- it will be sent at first <presence/> for other entities advertise_perm(session, bare_jid, ent_priv) set_presence_perm_set(bare_jid, ent_priv) advertise_presences(session, bare_jid, ent_priv) end end session.privileges[_MODULE_HOST] = ent_priv end local function on_presence(event) -- Permission are already checked at this point, -- we only advertise them to the entity local session = event.origin local session_privileges = get_session_privileges(session, _MODULE_HOST) if session_privileges then advertise_perm(session, session.full_jid, session_privileges) set_presence_perm_set(session.full_jid, session_privileges) advertise_presences(session, session.full_jid, session_privileges) end end local function on_component_auth(event) -- react to component-authenticated event from this host -- and call the on_auth methods from all other hosts -- needed for the component to get delegations advertising for callback in connected_cb:items() do callback(event) end end if module:get_host_type() ~= "component" then connected_cb:add(on_auth) end module:hook('authentication-success', on_auth) module:hook('component-authenticated', on_component_auth) module:hook('presence/initial', on_presence) --> roster permission <-- -- get module:hook("iq-get/bare/jabber:iq:roster:query", function(event) local session, stanza = event.origin, event.stanza; if not stanza.attr.to then -- we don't want stanzas addressed to /self return; end local node, host = jid.split(stanza.attr.to); local session_privileges = get_session_privileges(session, host) if session_privileges and _ROSTER_GET_PERM:contains(session_privileges.roster) then module:log("debug", "Roster get from allowed privileged entity received") -- following code is adapted from mod_remote_roster local roster = roster_manager.load_roster(node, host); local reply = st.reply(stanza):query("jabber:iq:roster"); for entity_jid, item in pairs(roster) do if entity_jid and entity_jid ~= "pending" then reply:tag("item", { jid = entity_jid, subscription = item.subscription, ask = item.ask, name = item.name, }); for group in pairs(item.groups) do reply:tag("group"):text(group):up(); end reply:up(); -- move out from item end end -- end of code adapted from mod_remote_roster session.send(reply); else module:log("warn", "Entity "..tostring(session.full_jid).." try to get roster without permission") session.send(st.error_reply(stanza, 'auth', 'forbidden')) end return true end); -- set module:hook("iq-set/bare/jabber:iq:roster:query", function(event) local session, stanza = event.origin, event.stanza; if not stanza.attr.to then -- we don't want stanzas addressed to /self return; end local from_node, from_host = jid.split(stanza.attr.to); local session_privileges = get_session_privileges(session, from_host) if session_privileges and _ROSTER_SET_PERM:contains(session_privileges.roster) then module:log("debug", "Roster set from allowed privileged entity received") -- following code is adapted from mod_remote_roster if not(usermanager_user_exists(from_node, from_host)) then return; end local roster = roster_manager.load_roster(from_node, from_host); if not(roster) then return; end local query = stanza.tags[1]; for _, item in ipairs(query.tags) do if item.name == "item" and item.attr.xmlns == "jabber:iq:roster" and item.attr.jid -- Protection against overwriting roster.pending, until we move it and item.attr.jid ~= "pending" then local item_jid = jid.prep(item.attr.jid); local _, host, resource = jid.split(item_jid); if not resource then if item_jid ~= stanza.attr.to then -- not self-item_jid if item.attr.subscription == "remove" then local r_item = roster[item_jid]; if r_item then roster[item_jid] = nil; if roster_manager.save_roster(from_node, from_host, roster) then session.send(st.reply(stanza)); roster_manager.roster_push(from_node, from_host, item_jid); else roster[item_jid] = item; session.send(st.error_reply(stanza, "wait", "internal-server-error", "Unable to save roster")); end else session.send(st.error_reply(stanza, "modify", "item-not-found")); end else local subscription = item.attr.subscription; if subscription ~= "both" and subscription ~= "to" and subscription ~= "from" and subscription ~= "none" then -- TODO error on invalid subscription = roster[item_jid] and roster[item_jid].subscription or "none"; end local r_item = {name = item.attr.name, groups = {}}; if r_item.name == "" then r_item.name = nil; end r_item.subscription = subscription; if subscription ~= "both" and subscription ~= "to" then r_item.ask = roster[item_jid] and roster[item_jid].ask; end for _, child in ipairs(item) do if child.name == "group" then local text = table.concat(child); if text and text ~= "" then r_item.groups[text] = true; end end end local olditem = roster[item_jid]; roster[item_jid] = r_item; if roster_manager.save_roster(from_node, from_host, roster) then -- Ok, send success session.send(st.reply(stanza)); -- and push change to all resources roster_manager.roster_push(from_node, from_host, item_jid); else -- Adding to roster failed roster[item_jid] = olditem; session.send(st.error_reply(stanza, "wait", "internal-server-error", "Unable to save roster")); end end else -- Trying to add self to roster session.send(st.error_reply(stanza, "cancel", "not-allowed")); end else -- Invalid JID added to roster module:log("warn", "resource: %s , host: %s", tostring(resource), tostring(host)) session.send(st.error_reply(stanza, "modify", "bad-request")); -- FIXME what's the correct error? end else -- Roster set didn't include a single item, or its name wasn't 'item' session.send(st.error_reply(stanza, "modify", "bad-request")); end end -- for loop end -- end of code adapted from mod_remote_roster else -- The permission is not granted module:log("warn", "Entity "..tostring(session.full_jid).." try to set roster without permission") session.send(st.error_reply(stanza, 'auth', 'forbidden')) end return true end); --> message permission <-- local function clean_xmlns(node) -- Recursively remove "jabber:client" attribute from node. -- In Prosody internal routing, xmlns should not be set. -- Keeping xmlns would lead to issues like mod_smacks ignoring the outgoing stanza, -- so we remove all xmlns attributes with a value of "jabber:client" if node.attr.xmlns == 'jabber:client' then for childnode in node:childtags() do clean_xmlns(childnode); end node.attr.xmlns = nil; end end module:hook("message/host", function(event) local session, stanza = event.origin, event.stanza; local privilege_elt = stanza:get_child('privilege', _PRIV_ENT_NS) if privilege_elt==nil then return; end local _, to_host = jid.split(stanza.attr.to) local session_privileges = get_session_privileges(session, to_host) if session_privileges and session_privileges.message=="outgoing" then if #privilege_elt.tags==1 and privilege_elt.tags[1].name == "forwarded" and privilege_elt.tags[1].attr.xmlns==_FORWARDED_NS then local message_elt = privilege_elt.tags[1]:get_child('message', 'jabber:client') if message_elt ~= nil then local _, from_host, from_resource = jid.split(message_elt.attr.from) if from_resource == nil and hosts[from_host] then -- we only accept bare jids from one of the server hosts clean_xmlns(message_elt); -- needed do to proper routing -- at this point everything should be alright, we can send the message prosody.core_route_stanza(nil, message_elt) else -- trying to send a message from a forbidden entity module:log("warn", "Entity "..tostring(session.full_jid).." try to send a message from "..tostring(message_elt.attr.from)) session.send(st.error_reply(stanza, 'auth', 'forbidden')) end else -- incorrect message child session.send(st.error_reply(stanza, "modify", "bad-request", "invalid forwarded <message/> element")); end else -- incorrect forwarded child session.send(st.error_reply(stanza, "modify", "bad-request", "invalid <forwarded/> element")); end; else -- The permission is not granted module:log("warn", "Entity "..tostring(session.full_jid).." try to send message without permission") session.send(st.error_reply(stanza, 'auth', 'forbidden')) end return true end); --> presence permission <-- local function same_tags(tag1, tag2) -- check if two tags are equivalent if tag1.name ~= tag2.name then return false; end if #tag1 ~= #tag2 then return false; end for name, value in pairs(tag1.attr) do if tag2.attr[name] ~= value then return false; end end for i=1,#tag1 do if type(tag1[i]) == "string" then if tag1[i] ~= tag2[i] then return false; end else if not same_tags(tag1[i], tag2[i]) then return false; end end end return true end local function same_presences(presence1, presence2) -- check that 2 <presence/> stanzas are equivalent (except for "to" attribute) -- /!\ if the id change but everything else is equivalent, this method return false -- this behaviour may change in the future if presence1.attr.from ~= presence2.attr.from or presence1.attr.id ~= presence2.attr.id or presence1.attr.type ~= presence2.attr.type then return false end if presence1.attr.id and presence1.attr.id == presence2.attr.id then return true; end if #presence1 ~= #presence2 then return false; end for i=1,#presence1 do if type(presence1[i]) == "string" then if presence1[i] ~= presence2[i] then return false; end else if not same_tags(presence1[i], presence2[i]) then return false; end end end return true end local function forward_presence(presence, to_jid) local presence_fwd = st.clone(presence) presence_fwd.attr.to = to_jid module:log("debug", "presence forwarded to "..to_jid..": "..tostring(presence_fwd)) module:send(presence_fwd) -- cache used to avoid to send several times the same stanza priv_session.last_presence = presence end module:hook("presence/bare", function(event) if presence_man_ent:empty() and presence_roster:empty() then return; end local stanza = event.stanza if stanza.attr.type == nil or stanza.attr.type == "unavailable" then if not stanza.attr.to then for entity in presence_man_ent:items() do if stanza.attr.from ~= entity then forward_presence(stanza, entity); end end else -- directed presence -- we ignore directed presences from our own host, as we already have them local _, from_host = jid.split(stanza.attr.from) if hosts[from_host] then return; end -- we don't send several time the same presence, as recommended in §7 #2 if priv_session.last_presence and same_presences(priv_session.last_presence, stanza) then return end for entity in presence_roster:items() do if stanza.attr.from ~= entity then forward_presence(stanza, entity); end end end end end, 150)