core/sessionmanager.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2009 Matthew Wild
   3 -- Copyright (C) 2008-2009 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 fire_event = require "core.eventmanager".fire_event;
  30 local add_task = require "util.timer".add_task;
  31 local gettime = require "socket".gettime;
  32
  33 local st = require "util.stanza";
  34
  35 local c2s_timeout = config_get("*", "core", "c2s_timeout");
  36
  37 local newproxy = newproxy;
  38 local getmetatable = getmetatable;
  39
  40 module "sessionmanager"
  41
  42 local open_sessions = 0;
  43
  44 function new_session(conn)
  45         local session = { conn = conn, type = "c2s_unauthed", conntime = gettime() };
  46         if true then
  47                 session.trace = newproxy(true);
  48                 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end;
  49         end
  50         open_sessions = open_sessions + 1;
  51         log("debug", "open sessions now: ".. open_sessions);
  52         local w = conn.write;
  53         session.send = function (t) w(conn, tostring(t)); end
  54         session.ip = conn:ip();
  55         local conn_name = "c2s"..tostring(conn):match("[a-f0-9]+$");
  56         session.log = logger.init(conn_name);
  57
  58         if c2s_timeout then
  59                 add_task(c2s_timeout, function ()
  60                         if session.type == "c2s_unauthed" then
  61                                 session:close("connection-timeout");
  62                         end
  63                 end);
  64         end
  65
  66         return session;
  67 end
  68
  69 local resting_session = { -- Resting, not dead
  70                 destroyed = true;
  71                 close = function (session)
  72                         session.log("debug", "Attempt to close already-closed session");
  73                 end;
  74         }; resting_session.__index = resting_session;
  75
  76 function retire_session(session)
  77         local log = session.log or log;
  78         for k in pairs(session) do
  79                 if k ~= "trace" and k ~= "log" and k ~= "id" then
  80                         session[k] = nil;
  81                 end
  82         end
  83
  84         function session.send(data) log("debug", "Discarding data sent to resting session: %s", tostring(data)); end
  85         function session.data(data) log("debug", "Discarding data received from resting session: %s", tostring(data)); end
  86         return setmetatable(session, resting_session);
  87 end
  88
  89 function destroy_session(session, err)
  90         (session.log or log)("info", "Destroying session for %s (%s@%s)", session.full_jid or "(unknown)", session.username or "(unknown)", session.host or "(unknown)");
  91         if session.destroyed then return; end
  92
  93         -- Remove session/resource from user's session list
  94         if session.full_jid then
  95                 hosts[session.host].sessions[session.username].sessions[session.resource] = nil;
  96                 full_sessions[session.full_jid] = nil;
  97
  98                 if not next(hosts[session.host].sessions[session.username].sessions) then
  99                         log("debug", "All resources of %s are now offline", session.username);
 100                         hosts[session.host].sessions[session.username] = nil;
 101                         bare_sessions[session.username..'@'..session.host] = nil;
 102                 end
 103
 104                 hosts[session.host].events.fire_event("resource-unbind", {session=session, error=err});
 105         end
 106
 107         retire_session(session);
 108 end
 109
 110 function make_authenticated(session, username)
 111         session.username = username;
 112         if session.type == "c2s_unauthed" then
 113                 session.type = "c2s";
 114         end
 115         session.log("info", "Authenticated as %s@%s", username or "(unknown)", session.host or "(unknown)");
 116         return true;
 117 end
 118
 119 -- returns true, nil on success
 120 -- returns nil, err_type, err, err_message on failure
 121 function bind_resource(session, resource)
 122         if not session.username then return nil, "auth", "not-authorized", "Cannot bind resource before authentication"; end
 123         if session.resource then return nil, "cancel", "already-bound", "Cannot bind multiple resources on a single connection"; end
 124         -- We don't support binding multiple resources
 125
 126         resource = resourceprep(resource);
 127         resource = resource ~= "" and resource or uuid_generate();
 128         --FIXME: Randomly-generated resources must be unique per-user, and never conflict with existing
 129
 130         if not hosts[session.host].sessions[session.username] then
 131                 local sessions = { sessions = {} };
 132                 hosts[session.host].sessions[session.username] = sessions;
 133                 bare_sessions[session.username..'@'..session.host] = sessions;
 134         else
 135                 local sessions = hosts[session.host].sessions[session.username].sessions;
 136                 local limit = config_get(session.host, "core", "max_resources") or 10;
 137                 if #sessions >= limit then
 138                         return nil, "cancel", "conflict", "Resource limit reached; only "..limit.." resources allowed";
 139                 end
 140                 if sessions[resource] then
 141                         -- Resource conflict
 142                         local policy = config_get(session.host, "core", "conflict_resolve");
 143                         local increment;
 144                         if policy == "random" then
 145                                 resource = uuid_generate();
 146                                 increment = true;
 147                         elseif policy == "increment" then
 148                                 increment = true; -- TODO ping old resource
 149                         elseif policy == "kick_new" then
 150                                 return nil, "cancel", "conflict", "Resource already exists";
 151                         else -- if policy == "kick_old" then
 152                                 sessions[resource]:close {
 153                                         condition = "conflict";
 154                                         text = "Replaced by new connection";
 155                                 };
 156                                 if not next(sessions) then
 157                                         hosts[session.host].sessions[session.username] = { sessions = sessions };
 158                                         bare_sessions[session.username.."@"..session.host] = hosts[session.host].sessions[session.username];
 159                                 end
 160                         end
 161                         if increment and sessions[resource] then
 162                                 local count = 1;
 163                                 while sessions[resource.."#"..count] do
 164                                         count = count + 1;
 165                                 end
 166                                 resource = resource.."#"..count;
 167                         end
 168                 end
 169         end
 170
 171         session.resource = resource;
 172         session.full_jid = session.username .. '@' .. session.host .. '/' .. resource;
 173         hosts[session.host].sessions[session.username].sessions[resource] = session;
 174         full_sessions[session.full_jid] = session;
 175
 176         session.roster = rm_load_roster(session.username, session.host);
 177
 178         hosts[session.host].events.fire_event("resource-bind", {session=session});
 179
 180         return true;
 181 end
 182
 183 function streamopened(session, attr)
 184         local send = session.send;
 185         session.host = attr.to;
 186         if not session.host then
 187                 session:close{ condition = "improper-addressing",
 188                         text = "A 'to' attribute is required on stream headers" };
 189                 return;
 190         end
 191         session.host = nameprep(session.host);
 192         session.version = tonumber(attr.version) or 0;
 193         session.streamid = uuid_generate();
 194         (session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
 195
 196         if not hosts[session.host] then
 197                 -- We don't serve this host...
 198                 session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
 199                 return;
 200         end
 201
 202         send("<?xml version='1.0'?>");
 203         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));
 204
 205         (session.log or log)("debug", "Sent reply <stream:stream> to client");
 206         session.notopen = nil;
 207
 208         -- If session.secure is *false* (not nil) then it means we /were/ encrypting
 209         -- since we now have a new stream header, session is secured
 210         if session.secure == false then
 211                 session.secure = true;
 212         end
 213
 214         local features = st.stanza("stream:features");
 215         hosts[session.host].events.fire_event("stream-features", { origin = session, features = features });
 216         fire_event("stream-features", session, features);
 217
 218         send(features);
 219
 220 end
 221
 222 function streamclosed(session)
 223         session.log("debug", "Received </stream:stream>");
 224         session:close();
 225 end
 226
 227 function send_to_available_resources(user, host, stanza)
 228         local jid = user.."@"..host;
 229         local count = 0;
 230         local user = bare_sessions[jid];
 231         if user then
 232                 for k, session in pairs(user.sessions) do
 233                         if session.presence then
 234                                 session.send(stanza);
 235                                 count = count + 1;
 236                         end
 237                 end
 238         end
 239         return count;
 240 end
 241
 242 function send_to_interested_resources(user, host, stanza)
 243         local jid = user.."@"..host;
 244         local count = 0;
 245         local user = bare_sessions[jid];
 246         if user then
 247                 for k, session in pairs(user.sessions) do
 248                         if session.interested then
 249                                 session.send(stanza);
 250                                 count = count + 1;
 251                         end
 252                 end
 253         end
 254         return count;
 255 end
 256
 257 return _M;