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