annotate mod_cache_c2s_caps/mod_cache_c2s_caps.lua @ 5256:44f7edd4f845

mod_http_oauth2: Reject non-local hosts in more code paths We're not issuing tokens for users on remote hosts, we can't even authenticate them since they're remote. Thus the host is always the local module.host so no need to pass around the host in most cases or use it for anything but enforcing the same host.
author Kim Alvefur <zash@zash.se>
date Thu, 16 Mar 2023 17:52:10 +0100
parents 8fc16174fec6
children
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1 local st_iq = require "util.stanza".iq;
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2 local uuid_gen = require "util.uuid".generate;
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3 local calculate_hash = require "util.caps".calculate_hash;
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4
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5 -- Map of jid..node, to avoid querying the same client multiple times for the same value.
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6 local in_flight_iqs = {}
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7
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8 -- Some clients (*ahem* poezio…) don’t include the @node in their result iq.
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9 local iq_node_map = {}
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10
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11 assert(module.send_iq, "This module is not compatible with this version of Prosody.");
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12
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13 local function iq_result_handler(event)
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14 local origin, stanza = event.origin, event.stanza;
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16 local query = stanza:get_child("query", "http://jabber.org/protocol/disco#info");
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17 if not query then
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18 origin.log("debug", "Wrong iq payload in disco#info result: %s", stanza);
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19 origin.caps_cache = nil;
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20 return;
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21 end
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22
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23 local from = stanza.attr.from;
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24 local id = stanza.attr.id;
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25 local node_string = query.attr.node;
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26 local node_query = iq_node_map[from..id];
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27 if node_string == nil then
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28 node_string = node_query;
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29 query.attr.node = node_query;
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30 end
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31 iq_node_map[from..id] = nil;
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32
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33 if node_string ~= node_query then
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34 origin.log("debug", "Wrong node for our disco#info query, expected %s, received %s", node_string, node_query);
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35 origin.caps_cache = nil;
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36 return;
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37 end
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39 local node, ver = node_query:match("([^#]+)#([^#]+)");
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40 local hash = calculate_hash(query)
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41 if ver ~= hash then
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42 origin.log("debug", "Wrong hash for disco#info: %s ~= %s", ver, hash);
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43 origin.caps_cache = nil;
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44 return;
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45 end
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46
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47 origin.caps_cache = query;
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48 origin.log("info", "Stored caps %s", ver);
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49 module:fire_event("c2s-capabilities-changed", { origin = origin });
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50 return true;
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51 end
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52
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53 local function iq_error_handler(err)
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54 local origin = err.context.origin;
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55 if origin ~= nil then
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56 origin.caps_cache = nil;
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57 module:fire_event("c2s-capabilities-changed", { origin = origin });
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58 end
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59 end
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60
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61 local function presence_stanza_handler(event)
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62 local origin, stanza = event.origin, event.stanza;
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63
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64 local from = stanza.attr.from;
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65 if stanza.attr.to ~= nil then
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66 return;
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67 end
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68
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69 local caps = stanza:get_child("c", "http://jabber.org/protocol/caps");
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70 if caps == nil then
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71 origin.log("debug", "Presence from %s without caps received, skipping", from);
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72 return;
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73 end
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74
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75 local hash = caps.attr.hash;
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76 local node = caps.attr.node;
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77 local ver = caps.attr.ver;
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78 if not hash or not node or not ver then
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79 return;
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80 end
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81 if hash ~= "sha-1" then
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82 origin.log("warn", "Presence from %s with non-SHA-1 caps : %s", from, hash);
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83 return;
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84 end
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85
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86 local node_query = node.."#"..ver;
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87 if (origin.caps_cache and origin.caps_cache.attr.node == node_query) or in_flight_iqs[from..node_query] ~= nil then
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88 origin.log("debug", "Already requested these caps, skipping");
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89 return;
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90 end
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91
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92 origin.log("debug", "Presence from %s with SHA-1 caps %s, querying disco#info", from, node_query);
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93
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94 local id = uuid_gen();
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95 iq_node_map[from..id] = node_query
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96 local iq = st_iq({ type = "get", from = module.host, to = from, id = id })
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97 :tag("query", { xmlns = "http://jabber.org/protocol/disco#info", node = node_query });
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98 in_flight_iqs[from..node_query] = true;
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99 module:send_iq(iq, origin)
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100 :next(iq_result_handler, iq_error_handler)
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101 :finally(function () in_flight_iqs[from..node_query] = nil; end)
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102 end
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103
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104 -- Handle only non-directed presences for now.
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105 module:hook("pre-presence/bare", presence_stanza_handler);