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annotate mod_turncredentials/mod_turncredentials.lua @ 1282:17cb51496469

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mod_manifesto: Module that informs users about the Security Test Days and which contacts it will affect (Thanks to MattJ, who wrote most of it)
author Kim Alvefur <zash@zash.se>
date Thu, 23 Jan 2014 17:23:04 +0100
parents a18effacd384
children 853a382c9bd6
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95ab35ef52ba mod_turncredentials: XEP-0215 implementation for time-limited turn credentials
Philipp Hancke <fippo@goodadvice.pages.de>
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1 -- XEP-0215 implementation for time-limited turn credentials
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2 -- Copyright (C) 2012-2013 Philipp Hancke
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3 -- This file is MIT/X11 licensed.
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4
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5 local st = require "util.stanza";
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2da546139cb5 mod_turncredentials: Import HMAC from util.hashes
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6 local hmac_sha1 = require "util.hashes".hmac_sha1;
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7 local base64 = require "util.encodings".base64;
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8 local os_time = os.time;
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0ae2c250f274 mod_turncredentials: Use type-specific get_option() methods where appropriate, and pass in default values
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9 local secret = module:get_option_string("turncredentials_secret");
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10 local host = module:get_option_string("turncredentials_host"); -- use ip addresses here to avoid further dns lookup latency
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11 local port = module:get_option_number("turncredentials_port", 3478);
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12 local ttl = module:get_option_number("turncredentials_ttl", 86400);
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13 if not (secret and host) then
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14 module:log("error", "turncredentials not configured");
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15 return;
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16 end
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17
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6695c3098025 mod_turncredentials: Use iq-get event, to save checking attr.type manually
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18 module:hook("iq-get/host/urn:xmpp:extdisco:1:services", function(event)
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19 local origin, stanza = event.origin, event.stanza;
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a18effacd384 mod_turncredentials: No need to check tag name, we're already in the event handler for the 'services' tag
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20 if origin.type ~= "c2s" then
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21 return;
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22 end
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0b6b33688b75 mod_turncredentials: use smarter timestamp expiry from draft-uberti-behave-turn-rest-00
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23 local now = os_time() + ttl;
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24 local userpart = tostring(now);
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25 local nonce = base64.encode(hmac_sha1(secret, tostring(userpart), false));
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26 origin.send(st.reply(stanza):tag("services", {xmlns = "urn:xmpp:extdisco:1"})
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27 :tag("service", { type = "stun", host = host, port = port }):up()
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28 :tag("service", { type = "turn", host = host, port = port, username = userpart, password = nonce, ttl = ttl}):up()
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29 );
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30 return true;
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31 end);