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annotate mod_sasl2_bind2/mod_sasl2_bind2.lua @ 5296:0f5657db1cfc

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mod_isolate_host: handle server-generated stanzas The hook for setting the no_host_isolation is only called for c2s sessions. This does not work for stanzas generated by the server, such as PEP notifications or presence probe answers. To handle that, we do per-stanza checks for the case that the origin is local.
author Jonas Schäfer <jonas@wielicki.name>
date Sat, 01 Apr 2023 12:03:08 +0200
parents 6361afcda1a3
children
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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);