core/sessionmanager.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2010 Matthew Wild
   3 -- Copyright (C) 2008-2010 Waqas Hussain
   4 --
   5 -- This project is MIT/X11 licensed. Please see the
   6 -- COPYING file in the source package for more information.
   7 --
   8
   9
  10
  11 local tonumber, tostring, setmetatable = tonumber, tostring, setmetatable;
  12 local ipairs, pairs, print, next= ipairs, pairs, print, next;
  13 local format = import("string", "format");
  14
  15 local hosts = hosts;
  16 local full_sessions = full_sessions;
  17 local bare_sessions = bare_sessions;
  18
  19 local modulemanager = require "core.modulemanager";
  20 local logger = require "util.logger";
  21 local log = logger.init("sessionmanager");
  22 local error = error;
  23 local uuid_generate = require "util.uuid".generate;
  24 local rm_load_roster = require "core.rostermanager".load_roster;
  25 local config_get = require "core.configmanager".get;
  26 local nameprep = require "util.encodings".stringprep.nameprep;
  27 local resourceprep = require "util.encodings".stringprep.resourceprep;
  28
  29 local initialize_filters = require "util.filters".initialize;
  30 local fire_event = require "core.eventmanager".fire_event;
  31 local add_task = require "util.timer".add_task;
  32 local gettime = require "socket".gettime;
  33
  34 local st = require "util.stanza";
  35
  36 local c2s_timeout = config_get("*", "core", "c2s_timeout");
  37
  38 local newproxy = newproxy;
  39 local getmetatable = getmetatable;
  40
  41 module "sessionmanager"
  42
  43 local open_sessions = 0;
  44
  45 function new_session(conn)
  46         local session = { conn = conn, type = "c2s_unauthed", conntime = gettime() };
  47         if true then
  48                 session.trace = newproxy(true);
  49                 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end;
  50         end
  51         open_sessions = open_sessions + 1;
  52         log("debug", "open sessions now: ".. open_sessions);
  53
  54         local filter = initialize_filters(session);
  55         local w = conn.write;
  56         session.send = function (t)
  57                 if t.name then
  58                         t = filter("stanzas/out", t);
  59                 end
  60                 if t then
  61                         t = filter("bytes/out", tostring(t));
  62                         if t then
  63                                 return w(conn, t);
  64                         end
  65                 end
  66         end
  67         session.ip = conn:ip();
  68         local conn_name = "c2s"..tostring(conn):match("[a-f0-9]+$");
  69         session.log = logger.init(conn_name);
  70
  71         if c2s_timeout then
  72                 add_task(c2s_timeout, function ()
  73                         if session.type == "c2s_unauthed" then
  74                                 session:close("connection-timeout");
  75                         end
  76                 end);
  77         end
  78
  79         return session;
  80 end
  81
  82 local resting_session = { -- Resting, not dead
  83                 destroyed = true;
  84                 type = "c2s_destroyed";
  85                 close = function (session)
  86                         session.log("debug", "Attempt to close already-closed session");
  87                 end;
  88         }; resting_session.__index = resting_session;
  89
  90 function retire_session(session)
  91         local log = session.log or log;
  92         for k in pairs(session) do
  93                 if k ~= "trace" and k ~= "log" and k ~= "id" then
  94                         session[k] = nil;
  95                 end
  96         end
  97
  98         function session.send(data) log("debug", "Discarding data sent to resting session: %s", tostring(data)); end
  99         function session.data(data) log("debug", "Discarding data received from resting session: %s", tostring(data)); end
 100         return setmetatable(session, resting_session);
 101 end
 102
 103 function destroy_session(session, err)
 104         (session.log or log)("info", "Destroying session for %s (%s@%s)", session.full_jid or "(unknown)", session.username or "(unknown)", session.host or "(unknown)");
 105         if session.destroyed then return; end
 106
 107         -- Remove session/resource from user's session list
 108         if session.full_jid then
 109                 hosts[session.host].sessions[session.username].sessions[session.resource] = nil;
 110                 full_sessions[session.full_jid] = nil;
 111
 112                 if not next(hosts[session.host].sessions[session.username].sessions) then
 113                         log("debug", "All resources of %s are now offline", session.username);
 114                         hosts[session.host].sessions[session.username] = nil;
 115                         bare_sessions[session.username..'@'..session.host] = nil;
 116                 end
 117
 118                 hosts[session.host].events.fire_event("resource-unbind", {session=session, error=err});
 119         end
 120
 121         retire_session(session);
 122 end
 123
 124 function make_authenticated(session, username)
 125         session.username = username;
 126         if session.type == "c2s_unauthed" then
 127                 session.type = "c2s";
 128         end
 129         session.log("info", "Authenticated as %s@%s", username or "(unknown)", session.host or "(unknown)");
 130         return true;
 131 end
 132
 133 -- returns true, nil on success
 134 -- returns nil, err_type, err, err_message on failure
 135 function bind_resource(session, resource)
 136         if not session.username then return nil, "auth", "not-authorized", "Cannot bind resource before authentication"; end
 137         if session.resource then return nil, "cancel", "already-bound", "Cannot bind multiple resources on a single connection"; end
 138         -- We don't support binding multiple resources
 139
 140         resource = resourceprep(resource);
 141         resource = resource ~= "" and resource or uuid_generate();
 142         --FIXME: Randomly-generated resources must be unique per-user, and never conflict with existing
 143
 144         if not hosts[session.host].sessions[session.username] then
 145                 local sessions = { sessions = {} };
 146                 hosts[session.host].sessions[session.username] = sessions;
 147                 bare_sessions[session.username..'@'..session.host] = sessions;
 148         else
 149                 local sessions = hosts[session.host].sessions[session.username].sessions;
 150                 local limit = config_get(session.host, "core", "max_resources") or 10;
 151                 if #sessions >= limit then
 152                         return nil, "cancel", "resource-constraint", "Resource limit reached; only "..limit.." resources allowed";
 153                 end
 154                 if sessions[resource] then
 155                         -- Resource conflict
 156                         local policy = config_get(session.host, "core", "conflict_resolve");
 157                         local increment;
 158                         if policy == "random" then
 159                                 resource = uuid_generate();
 160                                 increment = true;
 161                         elseif policy == "increment" then
 162                                 increment = true; -- TODO ping old resource
 163                         elseif policy == "kick_new" then
 164                                 return nil, "cancel", "conflict", "Resource already exists";
 165                         else -- if policy == "kick_old" then
 166                                 sessions[resource]:close {
 167                                         condition = "conflict";
 168                                         text = "Replaced by new connection";
 169                                 };
 170                                 if not next(sessions) then
 171                                         hosts[session.host].sessions[session.username] = { sessions = sessions };
 172                                         bare_sessions[session.username.."@"..session.host] = hosts[session.host].sessions[session.username];
 173                                 end
 174                         end
 175                         if increment and sessions[resource] then
 176                                 local count = 1;
 177                                 while sessions[resource.."#"..count] do
 178                                         count = count + 1;
 179                                 end
 180                                 resource = resource.."#"..count;
 181                         end
 182                 end
 183         end
 184
 185         session.resource = resource;
 186         session.full_jid = session.username .. '@' .. session.host .. '/' .. resource;
 187         hosts[session.host].sessions[session.username].sessions[resource] = session;
 188         full_sessions[session.full_jid] = session;
 189
 190         local err;
 191         session.roster, err = rm_load_roster(session.username, session.host);
 192         if err then
 193                 full_sessions[session.full_jid] = nil;
 194                 hosts[session.host].sessions[session.username].sessions[resource] = nil;
 195                 session.full_jid = nil;
 196                 session.resource = nil;
 197                 if next(bare_sessions[session.username..'@'..session.host].sessions) == nil then
 198                         bare_sessions[session.username..'@'..session.host] = nil;
 199                         hosts[session.host].sessions[session.username] = nil;
 200                 end
 201                 return nil, "cancel", "internal-server-error", "Error loading roster";
 202         end
 203
 204         hosts[session.host].events.fire_event("resource-bind", {session=session});
 205
 206         return true;
 207 end
 208
 209 function streamopened(session, attr)
 210         local send = session.send;
 211         session.host = attr.to;
 212         if not session.host then
 213                 session:close{ condition = "improper-addressing",
 214                         text = "A 'to' attribute is required on stream headers" };
 215                 return;
 216         end
 217         session.host = nameprep(session.host);
 218         session.version = tonumber(attr.version) or 0;
 219         session.streamid = uuid_generate();
 220         (session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
 221
 222         if not hosts[session.host] then
 223                 -- We don't serve this host...
 224                 session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
 225                 return;
 226         end
 227
 228         send("<?xml version='1.0'?>");
 229         send(format("<stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' id='%s' from='%s' version='1.0' xml:lang='en'>", session.streamid, session.host));
 230
 231         (session.log or log)("debug", "Sent reply <stream:stream> to client");
 232         session.notopen = nil;
 233
 234         -- If session.secure is *false* (not nil) then it means we /were/ encrypting
 235         -- since we now have a new stream header, session is secured
 236         if session.secure == false then
 237                 session.secure = true;
 238         end
 239
 240         local features = st.stanza("stream:features");
 241         hosts[session.host].events.fire_event("stream-features", { origin = session, features = features });
 242         fire_event("stream-features", session, features);
 243
 244         send(features);
 245
 246 end
 247
 248 function streamclosed(session)
 249         session.log("debug", "Received </stream:stream>");
 250         session:close();
 251 end
 252
 253 function send_to_available_resources(user, host, stanza)
 254         local jid = user.."@"..host;
 255         local count = 0;
 256         local user = bare_sessions[jid];
 257         if user then
 258                 for k, session in pairs(user.sessions) do
 259                         if session.presence then
 260                                 session.send(stanza);
 261                                 count = count + 1;
 262                         end
 263                 end
 264         end
 265         return count;
 266 end
 267
 268 function send_to_interested_resources(user, host, stanza)
 269         local jid = user.."@"..host;
 270         local count = 0;
 271         local user = bare_sessions[jid];
 272         if user then
 273                 for k, session in pairs(user.sessions) do
 274                         if session.interested then
 275                                 session.send(stanza);
 276                                 count = count + 1;
 277                         end
 278                 end
 279         end
 280         return count;
 281 end
 282
 283 return _M;