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