prosody
03287c06d986
plugins/mod_tls.lua

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plugins/mod_tls.lua @ 2625:03287c06d986

mod_tls: Refactor to simplify detection of whether we can do TLS on a connection
author Matthew Wild <mwild1@gmail.com>
date Fri, 12 Feb 2010 21:57:46 +0000
parent 2623:1d34b45dec15
child 2635:e79057cf2538
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2009 Matthew Wild
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3 -- Copyright (C) 2008-2009 Waqas Hussain
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 local st = require "util.stanza";
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10
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11 local secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption");
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12 local secure_s2s_only = module:get_option("s2s_require_encryption");
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14 local xmlns_starttls = 'urn:ietf:params:xml:ns:xmpp-tls';
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15 local starttls_attr = { xmlns = xmlns_starttls };
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16 local starttls_proceed = st.stanza("proceed", starttls_attr);
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17 local starttls_failure = st.stanza("failure", starttls_attr);
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18 local c2s_feature = st.stanza("starttls", starttls_attr);
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19 local s2s_feature = st.stanza("starttls", starttls_attr);
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20 if secure_auth_only then c2s_feature:tag("required"):up(); end
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21 if secure_s2s_only then s2s_feature:tag("required"):up(); end
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22
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23 local global_ssl_ctx = prosody.global_ssl_ctx;
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24
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25 local host = hosts[module.host];
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26
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27 local function can_do_tls(session)
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28 if session.type == "c2s_unauthed" then
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29 return session.username and session.conn.starttls and host.ssl_ctx_in;
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30 elseif session.type == "s2sin_unauthed" then
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31 return origin.to_host and origin.conn.starttls and host.ssl_ctx_in;
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32 end
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33 return false;
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34 end
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35
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36 -- Hook <starttls/>
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37 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-tls:starttls", function(event)
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38 local origin = event.origin;
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39 if can_do_tls(origin) then
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40 (origin.sends2s or origin.send)(starttls_proceed);
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41 origin:reset_stream();
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42 local host = origin.to_host or origin.host;
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43 local ssl_ctx = host and hosts[host].ssl_ctx_in or global_ssl_ctx;
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44 origin.conn:starttls(ssl_ctx);
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45 origin.log("info", "TLS negotiation started for %s...", origin.type);
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46 origin.secure = false;
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47 else
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48 origin.log("warn", "Attempt to start TLS, but TLS is not available on this %s connection", origin.type);
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49 (origin.sends2s or origin.send)(starttls_failure);
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50 origin:close();
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51 end
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52 return true;
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53 end);
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54
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55 -- Advertize stream feature
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56 module:hook("stream-features", function(event)
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57 local origin, features = event.origin, event.features;
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58 if can_do_tls(origin) then
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59 features:add_child(c2s_feature);
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60 end
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61 end);
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62 module:hook("s2s-stream-features", function(event)
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63 local origin, features = event.origin, event.features;
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64 if can_do_tls(origin) then
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65 features:add_child(s2s_feature);
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66 end
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67 end);
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68
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69 -- For s2sout connections, start TLS if we can
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70 module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza)
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71 module:log("debug", "Received features element");
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72 if session.conn.starttls and stanza:child_with_ns(xmlns_starttls) then
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73 module:log("%s is offering TLS, taking up the offer...", session.to_host);
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74 session.sends2s("<starttls xmlns='"..xmlns_starttls.."'/>");
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75 return true;
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76 end
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77 end, 500);
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78
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79 module:hook_stanza(xmlns_starttls, "proceed", function (session, stanza)
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80 module:log("debug", "Proceeding with TLS on s2sout...");
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81 session:reset_stream();
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82 local ssl_ctx = session.from_host and hosts[session.from_host].ssl_ctx or global_ssl_ctx;
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83 session.conn:starttls(ssl_ctx, true);
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84 session.secure = false;
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85 return true;
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86 end);