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