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 collectgarbage = collectgarbage;
  14 local m_random = import("math", "random");
  15 local format = import("string", "format");
  16
  17 local hosts = hosts;
  18 local full_sessions = full_sessions;
  19 local bare_sessions = bare_sessions;
  20
  21 local modulemanager = require "core.modulemanager";
  22 local logger = require "util.logger";
  23 local log = logger.init("sessionmanager");
  24 local error = error;
  25 local uuid_generate = require "util.uuid".generate;
  26 local rm_load_roster = require "core.rostermanager".load_roster;
  27 local config_get = require "core.configmanager".get;
  28 local nameprep = require "util.encodings".stringprep.nameprep;
  29
  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         local w = conn.write;
  54         session.send = function (t) w(tostring(t)); end
  55         session.ip = conn.ip();
  56         local conn_name = "c2s"..tostring(conn):match("[a-f0-9]+$");
  57         session.log = logger.init(conn_name);
  58
  59         if c2s_timeout then
  60                 add_task(c2s_timeout, function ()
  61                         if session.type == "c2s_unauthed" then
  62                                 session:close("connection-timeout");
  63                         end
  64                 end);
  65         end
  66
  67         return session;
  68 end
  69
  70 function destroy_session(session, err)
  71         (session.log or log)("info", "Destroying session for %s (%s@%s)", session.full_jid or "(unknown)", session.username or "(unknown)", session.host or "(unknown)");
  72
  73         -- Remove session/resource from user's session list
  74         if session.full_jid then
  75                 hosts[session.host].events.fire_event("resource-unbind", {session=session, error=err});
  76
  77                 hosts[session.host].sessions[session.username].sessions[session.resource] = nil;
  78                 full_sessions[session.full_jid] = nil;
  79
  80                 if not next(hosts[session.host].sessions[session.username].sessions) then
  81                         log("debug", "All resources of %s are now offline", session.username);
  82                         hosts[session.host].sessions[session.username] = nil;
  83                         bare_sessions[session.username..'@'..session.host] = nil;
  84                 end
  85         end
  86
  87         for k in pairs(session) do
  88                 if k ~= "trace" then
  89                         session[k] = nil;
  90                 end
  91         end
  92 end
  93
  94 function make_authenticated(session, username)
  95         session.username = username;
  96         if session.type == "c2s_unauthed" then
  97                 session.type = "c2s";
  98         end
  99         session.log("info", "Authenticated as %s@%s", username or "(unknown)", session.host or "(unknown)");
 100         return true;
 101 end
 102
 103 -- returns true, nil on success
 104 -- returns nil, err_type, err, err_message on failure
 105 function bind_resource(session, resource)
 106         if not session.username then return nil, "auth", "not-authorized", "Cannot bind resource before authentication"; end
 107         if session.resource then return nil, "cancel", "already-bound", "Cannot bind multiple resources on a single connection"; end
 108         -- We don't support binding multiple resources
 109
 110         resource = resource or uuid_generate();
 111         --FIXME: Randomly-generated resources must be unique per-user, and never conflict with existing
 112
 113         if not hosts[session.host].sessions[session.username] then
 114                 local sessions = { sessions = {} };
 115                 hosts[session.host].sessions[session.username] = sessions;
 116                 bare_sessions[session.username..'@'..session.host] = sessions;
 117         else
 118                 local sessions = hosts[session.host].sessions[session.username].sessions;
 119                 local limit = config_get(session.host, "core", "max_resources") or 10;
 120                 if #sessions >= limit then
 121                         return nil, "cancel", "conflict", "Resource limit reached; only "..limit.." resources allowed";
 122                 end
 123                 if sessions[resource] then
 124                         -- Resource conflict
 125                         local policy = config_get(session.host, "core", "conflict_resolve");
 126                         local increment;
 127                         if policy == "random" then
 128                                 resource = uuid_generate();
 129                                 increment = true;
 130                         elseif policy == "increment" then
 131                                 increment = true; -- TODO ping old resource
 132                         elseif policy == "kick_new" then
 133                                 return nil, "cancel", "conflict", "Resource already exists";
 134                         else -- if policy == "kick_old" then
 135                                 sessions[resource]:close {
 136                                         condition = "conflict";
 137                                         text = "Replaced by new connection";
 138                                 };
 139                                 if not next(sessions) then
 140                                         hosts[session.host].sessions[session.username] = { sessions = sessions };
 141                                         bare_sessions[session.username.."@"..session.host] = hosts[session.host].sessions[session.username];
 142                                 end
 143                         end
 144                         if increment and sessions[resource] then
 145                                 local count = 1;
 146                                 while sessions[resource.."#"..count] do
 147                                         count = count + 1;
 148                                 end
 149                                 resource = resource.."#"..count;
 150                         end
 151                 end
 152         end
 153
 154         session.resource = resource;
 155         session.full_jid = session.username .. '@' .. session.host .. '/' .. resource;
 156         hosts[session.host].sessions[session.username].sessions[resource] = session;
 157         full_sessions[session.full_jid] = session;
 158
 159         session.roster = rm_load_roster(session.username, session.host);
 160
 161         hosts[session.host].events.fire_event("resource-bind", {session=session});
 162
 163         return true;
 164 end
 165
 166 function streamopened(session, attr)
 167         local send = session.send;
 168         session.host = attr.to or error("Client failed to specify destination hostname");
 169         session.host = nameprep(session.host);
 170         session.version = tonumber(attr.version) or 0;
 171         session.streamid = m_random(1000000, 99999999);
 172         (session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
 173
 174         send("<?xml version='1.0'?>");
 175         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));
 176
 177         if not hosts[session.host] then
 178                 -- We don't serve this host...
 179                 session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
 180                 return;
 181         end
 182
 183         -- If session.secure is *false* (not nil) then it means we /were/ encrypting
 184         -- since we now have a new stream header, session is secured
 185         if session.secure == false then
 186                 session.secure = true;
 187         end
 188
 189         local features = st.stanza("stream:features");
 190         fire_event("stream-features", session, features);
 191
 192         send(features);
 193
 194         (session.log or log)("debug", "Sent reply <stream:stream> to client");
 195         session.notopen = nil;
 196 end
 197
 198 function streamclosed(session)
 199         session.send("</stream:stream>");
 200         session.notopen = true;
 201 end
 202
 203 function send_to_available_resources(user, host, stanza)
 204         local count = 0;
 205         local to = stanza.attr.to;
 206         stanza.attr.to = nil;
 207         local h = hosts[host];
 208         if h and h.type == "local" then
 209                 local u = h.sessions[user];
 210                 if u then
 211                         for k, session in pairs(u.sessions) do
 212                                 if session.presence then
 213                                         session.send(stanza);
 214                                         count = count + 1;
 215                                 end
 216                         end
 217                 end
 218         end
 219         stanza.attr.to = to;
 220         return count;
 221 end
 222
 223 return _M;