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annotate mod_sasl2_bind2/mod_sasl2_bind2.lua @ 5405:c7a5caad28ef

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mod_http_oauth2: Enforce response type encoded in client_id The client promises to only use this response type, so we should hold them to that. This makes it fail earlier if the response type is disabled or the client is trying to use one that it promised not to use. Better than failing after login and consent.
author Kim Alvefur <zash@zash.se>
date Tue, 02 May 2023 16:31:25 +0200
parents 6361afcda1a3
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 local base64 = require "util.encodings".base64;
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2 local id = require "util.id";
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3 local sha1 = require "util.hashes".sha1;
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4 local st = require "util.stanza";
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5
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6 local sm_bind_resource = require "core.sessionmanager".bind_resource;
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7
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8 local xmlns_bind2 = "urn:xmpp:bind:0";
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9 local xmlns_sasl2 = "urn:xmpp:sasl:2";
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10
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11 module:depends("sasl2");
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12
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13 -- Advertise what we can do
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14
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15 module:hook("advertise-sasl-features", function(event)
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16 local bind = st.stanza("bind", { xmlns = xmlns_bind2 });
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17 local inline = st.stanza("inline");
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18 module:fire_event("advertise-bind-features", { origin = event.origin, features = inline });
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19 bind:add_direct_child(inline);
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20
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21 event.features:add_direct_child(bind);
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22 end, 1);
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23
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24 -- Helper to actually bind a resource to a session
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25
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26 local function do_bind(session, bind_request)
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27 local resource = session.sasl_handler.resource;
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28
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29 if not resource then
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30 local client_name_tag = bind_request:get_child_text("tag");
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31 if client_name_tag then
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32 local client_id = session.client_id;
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33 local tag_suffix = client_id and base64.encode(sha1(client_id):sub(1, 9)) or id.medium();
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34 resource = ("%s~%s"):format(client_name_tag, tag_suffix);
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35 end
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36 end
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37
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38 local success, err_type, err, err_msg = sm_bind_resource(session, resource);
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39 if not success then
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40 session.log("debug", "Resource bind failed: %s", err_msg or err);
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41 return nil, { type = err_type, condition = err, text = err_msg };
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42 end
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43
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44 session.log("debug", "Resource bound: %s", session.full_jid);
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45 return st.stanza("bound", { xmlns = xmlns_bind2 });
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46 end
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47
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48 -- Enable inline features requested by the client
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49
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50 local function enable_features(session, bind_request, bind_result)
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51 module:fire_event("enable-bind-features", {
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52 session = session;
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53 request = bind_request;
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54 result = bind_result;
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55 });
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56 end
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57
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58 -- SASL 2 integration
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59
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60 module:hook_tag(xmlns_sasl2, "authenticate", function (session, auth)
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61 -- Cache action for future processing (after auth success)
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62 session.sasl2_bind_request = auth:child_with_ns(xmlns_bind2);
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63 end, 100);
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64
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65 module:hook("sasl2/c2s/success", function (event)
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66 local session = event.session;
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67
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68 local bind_request = session.sasl2_bind_request;
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69 if not bind_request then return; end -- No bind requested
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70 session.sasl2_bind_request = nil;
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71
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72 local sm_success = session.sasl2_sm_success;
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73 if sm_success and sm_success.type == "resumed" then
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74 return; -- No need to bind a resource
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75 end
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76
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77 local bind_result, err = do_bind(session, bind_request);
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78 if not bind_result then
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79 bind_result = st.stanza("failed", { xmlns = xmlns_bind2 })
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80 :add_error(err);
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81 else
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82 enable_features(session, bind_request, bind_result);
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83 end
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84
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85 event.success:add_child(bind_result);
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86 end, 100);
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87
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88 -- Inline features
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89
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90 module:hook("advertise-bind-features", function (event)
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91 local features = event.features;
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92 features:tag("feature", { var = "urn:xmpp:carbons:2" }):up();
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93 features:tag("feature", { var = "urn:xmpp:csi:0" }):up();
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94 end);
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95
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96 module:hook("enable-bind-features", function (event)
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97 local session, request = event.session, event.request;
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98
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99 -- Carbons
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100 if request:get_child("enable", "urn:xmpp:carbons:2") then
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101 session.want_carbons = true;
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102 event.result:tag("enabled", { xmlns = "urn:xmpp:carbons:2" }):up();
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103 end
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104
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105 -- CSI
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106 local csi_state_tag = request:child_with_ns("urn:xmpp:csi:0");
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107 if csi_state_tag then
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108 session.state = csi_state_tag.name;
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109 end
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110 end, 10);