Mercurial > prosody-modules
view mod_inject_ecaps2/mod_inject_ecaps2.lua @ 5401:c8d04ac200fc
mod_http_oauth2: Reject loopback URIs as client_uri
This really should be a proper website with info, https://localhost is
not good enough. Ideally we'd validate that it's got proper DNS and is
actually reachable, but triggering HTTP or even DNS lookups seems like
it would carry abuse potential that would best to avoid.
author | Kim Alvefur <zash@zash.se> |
---|---|
date | Tue, 02 May 2023 16:20:55 +0200 |
parents | ce946d9d982e |
children |
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module:depends("cache_c2s_caps"); local st = require "util.stanza"; local hashes = require "util.hashes"; local base64 = require "util.encodings".base64; local t_insert, t_sort, t_concat = table.insert, table.sort, table.concat; local algorithms = module:get_option_set("ecaps2_hashes", { "sha-256", "sha-512" }); -- TODO: Add all of the other hashes supported. local algorithm_map = { ["sha-256"] = hashes.sha256; ["sha-512"] = hashes.sha512; }; -- TODO: move that to util.caps maybe. local function calculate_hash(disco_info) local identities, features, extensions = {}, {}, {}; for _, tag in ipairs(disco_info) do if tag.name == "identity" then t_insert(identities, ((tag.attr.category or "").."\31".. (tag.attr.type or "").."\31".. (tag.attr["xml:lang"] or "").."\31".. (tag.attr.name or "").."\31\30")); elseif tag.name == "feature" then t_insert(features, (tag.attr.var or "").."\31"); elseif tag.name == "x" and tag.attr.xmlns == "jabber:x:data" then local form = {}; for _, field in ipairs(tag.tags) do if field.name == "field" and field.attr.xmlns == "jabber:x:data" and field.attr.var then local values = {}; for _, value in ipairs(field.tags) do if value.name == "value" and value.attr.xmlns == "jabber:x:data" then value = #value.tags == 0 and value:get_text(); if value then t_insert(values, value.."\31"); end end end t_sort(values); if #values > 0 then t_insert(form, field.attr.var.."\31"..t_concat(values, "\31").."\31\30"); else t_insert(form, field.attr.var.."\31\30"); end end end t_sort(form); form = t_concat(form, "\29").."\29"; t_insert(extensions, form); else return nil, "Unknown element in disco#info"; end end t_sort(identities); t_sort(features); t_sort(extensions); if #identities > 0 then identities = t_concat(identities, "\28").."\28"; else identities = "\28"; end if #features > 0 then features = t_concat(features).."\28"; else features = "\28"; end if #extensions > 0 then extensions = t_concat(extensions, "\28").."\28"; else extensions = "\28"; end return features..identities..extensions; end local function caps_handler(event) local origin = event.origin; if origin.presence == nil or origin.presence:get_child("c", "urn:xmpp:caps") then return; end local disco_info = origin.caps_cache; if disco_info == nil then return; end local extension_string, err = calculate_hash(disco_info); if extension_string == nil then module:log("warn", "Failed to calculate ecaps2 hash: %s", err) return; end local ecaps2 = st.stanza("c", { xmlns = "urn:xmpp:caps" }); for algo in algorithms do local func = algorithm_map[algo]; if func ~= nil then local hash = base64.encode(func(extension_string)); ecaps2:tag("hash", { xmlns = "urn:xmpp:hashes:2"; algo = algo }) :text(hash) :up(); end end module:log("debug", "Injected ecaps2 element in presence"); origin.presence:add_child(ecaps2); end module:hook("c2s-capabilities-changed", caps_handler);