aboutsummaryrefslogtreecommitdiffstats
path: root/core/sessionmanager.lua
blob: 08e9b7ed76d4583654deaf2595ed61b7860ee850 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
-- Prosody IM v0.4
-- Copyright (C) 2008-2009 Matthew Wild
-- Copyright (C) 2008-2009 Waqas Hussain
-- 
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--



local tonumber, tostring = tonumber, tostring;
local ipairs, pairs, print, next= ipairs, pairs, print, next;
local collectgarbage = collectgarbage;
local m_random = import("math", "random");
local format = import("string", "format");

local hosts = hosts;
local full_sessions = full_sessions;
local bare_sessions = bare_sessions;

local modulemanager = require "core.modulemanager";
local log = require "util.logger".init("sessionmanager");
local error = error;
local uuid_generate = require "util.uuid".generate;
local rm_load_roster = require "core.rostermanager".load_roster;
local config_get = require "core.configmanager".get;
local nameprep = require "util.encodings".stringprep.nameprep;

local fire_event = require "core.eventmanager".fire_event;

local gettime = require "socket".gettime;

local st = require "util.stanza";

local newproxy = newproxy;
local getmetatable = getmetatable;

module "sessionmanager"

local open_sessions = 0;

function new_session(conn)
	local session = { conn = conn,  priority = 0, type = "c2s_unauthed", conntime = gettime() };
	if true then
		session.trace = newproxy(true);
		getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end;
	end
	open_sessions = open_sessions + 1;
	log("debug", "open sessions now: ".. open_sessions);
	local w = conn.write;
	session.send = function (t) w(tostring(t)); end
	session.ip = conn.ip();
	return session;
end

function destroy_session(session, err)
	(session.log or log)("info", "Destroying session for %s (%s@%s)", session.full_jid or "(unknown)", session.username or "(unknown)", session.host or "(unknown)");
	
	-- Send unavailable presence
	if session.presence then
		local pres = st.presence{ type = "unavailable" };
		if (not err) or err == "closed" then err = "connection closed"; end
		pres:tag("status"):text("Disconnected: "..err):up();
		session:dispatch_stanza(pres);
	end
	
	-- Remove session/resource from user's session list
	if session.full_jid then
		if session.resource then
			hosts[session.host].sessions[session.username].sessions[session.resource] = nil;
			full_sessions[session.full_jid] = nil;
		end
			
		if not next(hosts[session.host].sessions[session.username].sessions) then
			log("debug", "All resources of %s are now offline", session.username);
			hosts[session.host].sessions[session.username] = nil;
			bare_sessions[session.host..'@'..session.username] = nil;
		end
	end
	
	for k in pairs(session) do
		if k ~= "trace" then
			session[k] = nil;
		end
	end
end

function make_authenticated(session, username)
	session.username = username;
	if session.type == "c2s_unauthed" then
		session.type = "c2s";
	end
	session.log("info", "Authenticated as %s@%s", username or "(unknown)", session.host or "(unknown)");
	return true;
end

-- returns true, nil on success
-- returns nil, err_type, err, err_message on failure
function bind_resource(session, resource)
	if not session.username then return nil, "auth", "not-authorized", "Cannot bind resource before authentication"; end
	if session.resource then return nil, "cancel", "already-bound", "Cannot bind multiple resources on a single connection"; end
	-- We don't support binding multiple resources

	resource = resource or uuid_generate();
	--FIXME: Randomly-generated resources must be unique per-user, and never conflict with existing
	
	if not hosts[session.host].sessions[session.username] then
		local sessions = { sessions = {} };
		hosts[session.host].sessions[session.username] = sessions;
		bare_sessions[session.host..'@'..session.username] = sessions;
	else
		local sessions = hosts[session.host].sessions[session.username].sessions;
		local limit = config_get(session.host, "core", "max_resources") or 10;
		if #sessions >= limit then
			return nil, "cancel", "conflict", "Resource limit reached; only "..limit.." resources allowed";
		end
		if sessions[resource] then
			-- Resource conflict
			local policy = config_get(session.host, "core", "conflict_resolve");
			local increment;
			if policy == "random" then
				resource = uuid_generate();
				increment = true;
			elseif policy == "increment" then
				increment = true; -- TODO ping old resource
			elseif policy == "kick_new" then
				return nil, "cancel", "conflict", "Resource already exists";
			else -- if policy == "kick_old" then
				sessions[resource]:close {
					condition = "conflict";
					text = "Replaced by new connection";
				};
				if not next(sessions) then
					hosts[session.host].sessions[session.username] = { sessions = sessions };
				end
			end
			if increment and sessions[resource] then
				local count = 1;
				while sessions[resource.."#"..count] do
					count = count + 1;
				end
				resource = resource.."#"..count;
			end
		end
	end
	
	session.resource = resource;
	session.full_jid = session.username .. '@' .. session.host .. '/' .. resource;
	hosts[session.host].sessions[session.username].sessions[resource] = session;
	full_sessions[session.full_jid] = session;
	
	session.roster = rm_load_roster(session.username, session.host);
	
	return true;
end

function streamopened(session, attr)
	local send = session.send;
	session.host = attr.to or error("Client failed to specify destination hostname");
	session.host = nameprep(session.host);
	session.version = tonumber(attr.version) or 0;
	session.streamid = m_random(1000000, 99999999);
	(session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
	
	send("<?xml version='1.0'?>");
	send(format("<stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' id='%s' from='%s' version='1.0'>", session.streamid, session.host));

	if not hosts[session.host] then
		-- We don't serve this host...
		session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
		return;
	end
	
	-- If session.secure is *false* (not nil) then it means we /were/ encrypting
	-- since we now have a new stream header, session is secured
	if session.secure == false then
		session.secure = true;
	end
						
	local features = st.stanza("stream:features");
	fire_event("stream-features", session, features);
	
	send(features);
	
	(session.log or log)("debug", "Sent reply <stream:stream> to client");
	session.notopen = nil;
end

function streamclosed(session)
	session.send("</stream:stream>");
	session.notopen = true;
end

function send_to_available_resources(user, host, stanza)
	local count = 0;
	local to = stanza.attr.to;
	stanza.attr.to = nil;
	local h = hosts[host];
	if h and h.type == "local" then
		local u = h.sessions[user];
		if u then
			for k, session in pairs(u.sessions) do
				if session.presence then
					session.send(stanza);
					count = count + 1;
				end
			end
		end
	end
	stanza.attr.to = to;
	return count;
end

return _M;