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plugins/mod_mimicking.lua @ 13126:d043834f15d2
mod_http: Use RFC 7239 Forwarded header to find original client IP
Prefer over X-Forwarded-* since it has an actual specification.
Main practical difference is that Forwarded may carry more properties
than only the IP address since it is a structured header.
Since we parse it into an array, it is easier to do the logical thing
and iterate backwards trough proxies until an untrusted one is
encountered. Compare the handling of X-Forwarded-For.
The 'secure' field now accounts for the full chain of proxies, which
must be secure all the way to be considered secure.
author | Kim Alvefur <zash@zash.se> |
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date | Sat, 03 Jun 2023 17:10:04 +0200 (2023-06-03) |
parent | 12977:74b9e05af71e |
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-- Prosody IM -- Copyright (C) 2012 Florian Zeitz -- Copyright (C) 2019 Kim Alvefur -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- local encodings = require "prosody.util.encodings"; assert(encodings.confusable, "This module requires that Prosody be built with ICU"); local skeleton = encodings.confusable.skeleton; local usage = require "prosody.util.prosodyctl".show_usage; local usermanager = require "prosody.core.usermanager"; local storagemanager = require "prosody.core.storagemanager"; local skeletons function module.load() if module.host ~= "*" then skeletons = module:open_store("skeletons"); end end module:hook("user-registered", function(user) local skel = skeleton(user.username); local ok, err = skeletons:set(skel, { username = user.username }); if not ok then module:log("error", "Unable to store mimicry data (%q => %q): %s", user.username, skel, err); end end); module:hook_global("user-deleted", function(user) if user.host ~= module.host then return end local skel = skeleton(user.username); local ok, err = skeletons:set(skel, nil); if not ok and err then module:log("error", "Unable to clear mimicry data (%q): %s", skel, err); end end); module:hook("user-registering", function(user) local existing, err = skeletons:get(skeleton(user.username)); if existing then module:log("debug", "Attempt to register username '%s' which could be confused with '%s'", user.username, existing.username); user.allowed = false; elseif err then module:log("error", "Unable to check if new username '%s' can be confused with any existing user: %s", err); end end); function module.command(arg) if (arg[1] ~= "bootstrap" or not arg[2]) then usage("mod_mimicking bootstrap <host>", "Initialize username mimicry database"); return; end local host = arg[2]; local host_session = prosody.hosts[host]; if not host_session then return "No such host"; end storagemanager.initialize_host(host); usermanager.initialize_host(host); skeletons = storagemanager.open(host, "skeletons"); local count = 0; for user in usermanager.users(host) do local skel = skeleton(user); local existing, err = skeletons:get(skel); if existing and existing.username ~= user then module:log("warn", "Existing usernames '%s' and '%s' are confusable", existing.username, user); elseif err then module:log("error", "Error checking for existing mimicry data (%q = %q): %s", user, skel, err); end local ok, err = skeletons:set(skel, { username = user }); if ok then count = count + 1; elseif err then module:log("error", "Unable to store mimicry data (%q => %q): %s", user, skel, err); end end module:log("info", "%d usernames indexed", count); end