prosody-modules
38a0e3621181
mod_sasl2_fast/mod_sasl2_fast.lua

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mod_sasl2_fast/mod_sasl2_fast.lua @ 5062:38a0e3621181

mod_sasl2_fast: New module for SASL2 FAST authentication (WIP)
author Matthew Wild <mwild1@gmail.com>
date Thu, 13 Oct 2022 22:47:35 +0100
child 5066:74145faceba2
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rev   line source
5062
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1 local tokenauth = module:depends("tokenauth");
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2 local sasl = require "util.sasl";
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3 local dt = require "util.datetime";
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4 local st = require "util.stanza";
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5
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6 local fast_token_ttl = module:get_option_number("sasl2_fast_token_ttl", 86400*21);
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7
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8 local xmlns_fast = "urn:xmpp:fast:0";
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9 local xmlns_sasl2 = "urn:xmpp:sasl:2";
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10
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11 function get_sasl_handler(session) --luacheck: ignore session
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12 local token_auth_profile = {
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13 token_test = function (_, client_id, token, mech_name, counter) --luacheck: ignore
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14 return false; -- FIXME
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15 end;
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16 };
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17 return sasl.new(module.host, token_auth_profile);
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18 end
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19
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20 -- Advertise FAST to connecting clients
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21 module:hook("advertise-sasl-features", function (event)
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22 local sasl_handler = get_sasl_handler(event.session);
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23 if not sasl_handler then return; end
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24 event.session.fast_sasl_handler = sasl_handler;
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25 local fast = st.stanza("fast", { xmlns = xmlns_fast });
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26 for mech in sasl_handler:mechanisms() do
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27 fast:text_tag("mechanism", mech);
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28 end
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29 event.features:add_child(fast);
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30 end);
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31
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32 -- Process any FAST elements in <authenticate/>
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33 module:hook_tag(xmlns_sasl2, "authenticate", function (session, auth)
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34 -- Cache action for future processing (after auth success)
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35 local fast_auth = auth:get_child(xmlns_fast, "fast");
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36 if fast_auth then
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37 -- Client says it is using FAST auth, so set our SASL handler
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38 session.log("debug", "Client is authenticating using FAST");
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39 session.sasl_handler = session.fast_sasl_handler;
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40 end
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41 session.fast_sasl_handler = nil;
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42 local fast_token_request = auth:get_child(xmlns_fast, "request-token");
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43 if fast_token_request then
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44 local mech = fast_token_request.attr.mechanism;
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45 session.log("debug", "Client requested new FAST token for %s", mech);
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46 session.fast_token_request = {
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47 mechanism = mech;
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48 };
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49 end
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50 end, 100);
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51
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52 -- Process post-success (new token generation, etc.)
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53 module:hook("sasl2/c2s/success", function (event)
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54 local session = event.session;
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55
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56 local token_request = session.fast_token_request;
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57 if token_request then
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58 local token, token_info = tokenauth.create_jid_token(
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59 session.full_jid,
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60 session.full_jid,
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61 session.role,
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62 fast_token_ttl,
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63 {
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64 fast_token = true;
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65 fast_mechanism = token_request.mechanism;
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66 }
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67 );
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68 if token then
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69 event.success:tag("token", {
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70 xmlns = xmlns_fast;
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71 expiry = dt.datetime(token_info.expiry);
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72 token = token;
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73 }):up();
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74 end
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75 end
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76 end, 75);
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77
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78
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79 -- X-PLAIN-TOKEN mechanism
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80
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81 local function x_plain_token(self, message) --luacheck: ignore 212/self
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82 if not message then
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83 return nil, "malformed-request";
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84 end
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85 return nil, "temporary-auth-failure"; -- FIXME
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86 end
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87
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88 sasl.registerMechanism("X-PLAIN-TOKEN", { "token_test" }, x_plain_token);