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 local nodeprep = require "util.encodings".stringprep.nodeprep;
  29
  30 local initialize_filters = require "util.filters".initialize;
  31 local fire_event = prosody.events.fire_event;
  32 local add_task = require "util.timer".add_task;
  33 local gettime = require "socket".gettime;
  34
  35 local st = require "util.stanza";
  36
  37 local c2s_timeout = config_get("*", "core", "c2s_timeout");
  38
  39 local newproxy = newproxy;
  40 local getmetatable = getmetatable;
  41
  42 module "sessionmanager"
  43
  44 local open_sessions = 0;
  45
  46 function new_session(conn)
  47         local session = { conn = conn, type = "c2s_unauthed", conntime = gettime() };
  48         if true then
  49                 session.trace = newproxy(true);
  50                 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end;
  51         end
  52         open_sessions = open_sessions + 1;
  53         log("debug", "open sessions now: ".. open_sessions);
  54
  55         local filter = initialize_filters(session);
  56         local w = conn.write;
  57         session.send = function (t)
  58                 if t.name then
  59                         t = filter("stanzas/out", t);
  60                 end
  61                 if t then
  62                         t = filter("bytes/out", tostring(t));
  63                         if t then
  64                                 return w(conn, t);
  65                         end
  66                 end
  67         end
  68         session.ip = conn:ip();
  69         local conn_name = "c2s"..tostring(conn):match("[a-f0-9]+$");
  70         session.log = logger.init(conn_name);
  71
  72         if c2s_timeout then
  73                 add_task(c2s_timeout, function ()
  74                         if session.type == "c2s_unauthed" then
  75                                 session:close("connection-timeout");
  76                         end
  77                 end);
  78         end
  79
  80         return session;
  81 end
  82
  83 local resting_session = { -- Resting, not dead
  84                 destroyed = true;
  85                 type = "c2s_destroyed";
  86                 close = function (session)
  87                         session.log("debug", "Attempt to close already-closed session");
  88                 end;
  89                 filter = function (type, data) return data; end;
  90         }; resting_session.__index = resting_session;
  91
  92 function retire_session(session)
  93         local log = session.log or log;
  94         for k in pairs(session) do
  95                 if k ~= "trace" and k ~= "log" and k ~= "id" then
  96                         session[k] = nil;
  97                 end
  98         end
  99
 100         function session.send(data) log("debug", "Discarding data sent to resting session: %s", tostring(data)); end
 101         function session.data(data) log("debug", "Discarding data received from resting session: %s", tostring(data)); end
 102         return setmetatable(session, resting_session);
 103 end
 104
 105 function destroy_session(session, err)
 106         (session.log or log)("info", "Destroying session for %s (%s@%s)", session.full_jid or "(unknown)", session.username or "(unknown)", session.host or "(unknown)");
 107         if session.destroyed then return; end
 108
 109         -- Remove session/resource from user's session list
 110         if session.full_jid then
 111                 hosts[session.host].sessions[session.username].sessions[session.resource] = nil;
 112                 full_sessions[session.full_jid] = nil;
 113
 114                 if not next(hosts[session.host].sessions[session.username].sessions) then
 115                         log("debug", "All resources of %s are now offline", session.username);
 116                         hosts[session.host].sessions[session.username] = nil;
 117                         bare_sessions[session.username..'@'..session.host] = nil;
 118                 end
 119
 120                 hosts[session.host].events.fire_event("resource-unbind", {session=session, error=err});
 121         end
 122
 123         retire_session(session);
 124 end
 125
 126 function make_authenticated(session, username)
 127         username = nodeprep(username);
 128         if not username or #username == 0 then return nil, "Invalid username"; end
 129         session.username = username;
 130         if session.type == "c2s_unauthed" then
 131                 session.type = "c2s";
 132         end
 133         session.log("info", "Authenticated as %s@%s", username or "(unknown)", session.host or "(unknown)");
 134         return true;
 135 end
 136
 137 -- returns true, nil on success
 138 -- returns nil, err_type, err, err_message on failure
 139 function bind_resource(session, resource)
 140         if not session.username then return nil, "auth", "not-authorized", "Cannot bind resource before authentication"; end
 141         if session.resource then return nil, "cancel", "already-bound", "Cannot bind multiple resources on a single connection"; end
 142         -- We don't support binding multiple resources
 143
 144         resource = resourceprep(resource);
 145         resource = resource ~= "" and resource or uuid_generate();
 146         --FIXME: Randomly-generated resources must be unique per-user, and never conflict with existing
 147
 148         if not hosts[session.host].sessions[session.username] then
 149                 local sessions = { sessions = {} };
 150                 hosts[session.host].sessions[session.username] = sessions;
 151                 bare_sessions[session.username..'@'..session.host] = sessions;
 152         else
 153                 local sessions = hosts[session.host].sessions[session.username].sessions;
 154                 local limit = config_get(session.host, "core", "max_resources") or 10;
 155                 if #sessions >= limit then
 156                         return nil, "cancel", "resource-constraint", "Resource limit reached; only "..limit.." resources allowed";
 157                 end
 158                 if sessions[resource] then
 159                         -- Resource conflict
 160                         local policy = config_get(session.host, "core", "conflict_resolve");
 161                         local increment;
 162                         if policy == "random" then
 163                                 resource = uuid_generate();
 164                                 increment = true;
 165                         elseif policy == "increment" then
 166                                 increment = true; -- TODO ping old resource
 167                         elseif policy == "kick_new" then
 168                                 return nil, "cancel", "conflict", "Resource already exists";
 169                         else -- if policy == "kick_old" then
 170                                 sessions[resource]:close {
 171                                         condition = "conflict";
 172                                         text = "Replaced by new connection";
 173                                 };
 174                                 if not next(sessions) then
 175                                         hosts[session.host].sessions[session.username] = { sessions = sessions };
 176                                         bare_sessions[session.username.."@"..session.host] = hosts[session.host].sessions[session.username];
 177                                 end
 178                         end
 179                         if increment and sessions[resource] then
 180                                 local count = 1;
 181                                 while sessions[resource.."#"..count] do
 182                                         count = count + 1;
 183                                 end
 184                                 resource = resource.."#"..count;
 185                         end
 186                 end
 187         end
 188
 189         session.resource = resource;
 190         session.full_jid = session.username .. '@' .. session.host .. '/' .. resource;
 191         hosts[session.host].sessions[session.username].sessions[resource] = session;
 192         full_sessions[session.full_jid] = session;
 193
 194         local err;
 195         session.roster, err = rm_load_roster(session.username, session.host);
 196         if err then
 197                 full_sessions[session.full_jid] = nil;
 198                 hosts[session.host].sessions[session.username].sessions[resource] = nil;
 199                 session.full_jid = nil;
 200                 session.resource = nil;
 201                 if next(bare_sessions[session.username..'@'..session.host].sessions) == nil then
 202                         bare_sessions[session.username..'@'..session.host] = nil;
 203                         hosts[session.host].sessions[session.username] = nil;
 204                 end
 205                 return nil, "cancel", "internal-server-error", "Error loading roster";
 206         end
 207
 208         hosts[session.host].events.fire_event("resource-bind", {session=session});
 209
 210         return true;
 211 end
 212
 213 function streamopened(session, attr)
 214         local send = session.send;
 215         session.host = attr.to;
 216         if not session.host then
 217                 session:close{ condition = "improper-addressing",
 218                         text = "A 'to' attribute is required on stream headers" };
 219                 return;
 220         end
 221         session.host = nameprep(session.host);
 222         session.version = tonumber(attr.version) or 0;
 223         session.streamid = uuid_generate();
 224         (session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
 225
 226         if not hosts[session.host] then
 227                 -- We don't serve this host...
 228                 session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
 229                 return;
 230         end
 231
 232         send("<?xml version='1.0'?>");
 233         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));
 234
 235         (session.log or log)("debug", "Sent reply <stream:stream> to client");
 236         session.notopen = nil;
 237
 238         -- If session.secure is *false* (not nil) then it means we /were/ encrypting
 239         -- since we now have a new stream header, session is secured
 240         if session.secure == false then
 241                 session.secure = true;
 242         end
 243
 244         local features = st.stanza("stream:features");
 245         hosts[session.host].events.fire_event("stream-features", { origin = session, features = features });
 246         fire_event("stream-features", session, features);
 247
 248         send(features);
 249
 250 end
 251
 252 function streamclosed(session)
 253         session.log("debug", "Received </stream:stream>");
 254         session:close();
 255 end
 256
 257 function send_to_available_resources(user, host, stanza)
 258         local jid = user.."@"..host;
 259         local count = 0;
 260         local user = bare_sessions[jid];
 261         if user then
 262                 for k, session in pairs(user.sessions) do
 263                         if session.presence then
 264                                 session.send(stanza);
 265                                 count = count + 1;
 266                         end
 267                 end
 268         end
 269         return count;
 270 end
 271
 272 function send_to_interested_resources(user, host, stanza)
 273         local jid = user.."@"..host;
 274         local count = 0;
 275         local user = bare_sessions[jid];
 276         if user then
 277                 for k, session in pairs(user.sessions) do
 278                         if session.interested then
 279                                 session.send(stanza);
 280                                 count = count + 1;
 281                         end
 282                 end
 283         end
 284         return count;
 285 end
 286
 287 return _M;