Mercurial > prosody-modules
view mod_xhtmlim/mod_xhtmlim.lua @ 5461:06640647d193
mod_http_oauth2: Fix use of arbitrary ports in loopback redirect URIs
Per draft-ietf-oauth-v2-1-08#section-8.4.2
> The authorization server MUST allow any port to be specified at the
> time of the request for loopback IP redirect URIs, to accommodate
> clients that obtain an available ephemeral port from the operating
> system at the time of the request.
Uncertain if it should normalize the host part, but it also seems
harmless to treat IPv6 and IPv4 the same here.
One thing is that "localhost" is NOT RECOMMENDED because it can
sometimes be pointed to non-loopback interfaces via DNS or hosts file.
author | Kim Alvefur <zash@zash.se> |
---|---|
date | Wed, 17 May 2023 13:51:30 +0200 |
parents | 1f68287138e3 |
children |
line wrap: on
line source
-- XEP-0071: XHTML-IM sanitizing local assert = assert; local st = require "util.stanza"; local url = require "socket.url"; local no_styles = module:get_option_boolean("strip_xhtml_style", true); -- Tables from XEP-0071 local xeptables = [[ <body/> class, id, title; style <head/> profile <html/> version <title/> <abbr/> class, id, title; style <acronym/> class, id, title; style <address/> class, id, title; style <blockquote/> class, id, title; style; cite <br/> class, id, title; style <cite/> class, id, title; style <code/> class, id, title; style <dfn/> class, id, title; style <div/> class, id, title; style <em/> class, id, title; style <h1/> class, id, title; style <h2/> class, id, title; style <h3/> class, id, title; style <h4/> class, id, title; style <h5/> class, id, title; style <h6/> class, id, title; style <kbd/> class, id, title; style <p/> class, id, title; style <pre/> class, id, title; style <q/> class, id, title; style; cite <samp/> class, id, title; style <span/> class, id, title; style <strong/> class, id, title; style <var/> class, id, title; style <a/> class, id, title; style; accesskey, charset, href, hreflang, rel, rev, tabindex, type <dl/> class, id, title; style <dt/> class, id, title; style <dd/> class, id, title; style <ol/> class, id, title; style <ul/> class, id, title; style <li/> class, id, title; style <img/> class, id, title; style; alt, height, longdesc, src, width ]]; -- map of whitelisted tag names to set of allowed attributes local tags = {}; -- { string : { string : boolean } } for tag, attrs in xeptables:gmatch("<(%w+)/>([^\n]*)") do tags[tag] = { xmlns = true, ["xml:lang"] = true }; for attr in attrs:gmatch("%w+") do tags[tag][attr] = true; end if no_styles then tags[tag]["style"] = nil; end end -- module:log("debug", "tags = %s;", require "util.serialization".serialize(tags)); -- TODO Decide if disallowed tags should be bounced or silently discarded. -- XEP says "ignore" and replace tag with text content, but that would -- need a different transform which can't use `maptags`. if not module:get_option_boolean("bounce_invalid_xhtml", false) then assert = function (x) return x end end local function sanitize_xhtml(tag) -- module:log("debug", "sanitize_xhtml(<{%s}%s>)", tag.attr.xmlns, tag.name); if tag.attr.xmlns == "http://www.w3.org/1999/xhtml" then local allowed = assert(tags[tag.name], tag.name); if allowed then for attr, value in pairs(tag.attr) do if not allowed[attr] then -- module:log("debug", "Removing disallowed attribute %q from <%s>", attr, tag.name); tag.attr[attr] = nil; elseif attr == "src" or attr == "href" then local urlattr = url.parse(value); local scheme = urlattr and urlattr.scheme; if scheme ~= "http" and scheme ~= "https" and scheme ~= "mailto" and scheme ~= "xmpp" and scheme ~= "cid" then tag.attr[attr] = "https://url.was.invalid/"; end end end else tag.name = "span" tag.attr = { xmlns = "http://www.w3.org/1999/xhtml" } end -- Check child tags tag:maptags(sanitize_xhtml); -- This tag is clean! return tag; end -- Not xhtml, probably best to discard it return nil; end -- Check for xhtml-im, sanitize if exists local function message_handler(event) local stanza = event.stanza; if stanza:get_child("html", "http://jabber.org/protocol/xhtml-im") then stanza = st.clone(stanza); if pcall(function() -- try stanza:get_child("html", "http://jabber.org/protocol/xhtml-im"):maptags(sanitize_xhtml); end) then event.stanza = stanza; else -- catch if stanza.attr.type ~= "error" then event.origin.send(st.error_reply(stanza, "modify", "not-acceptable", "Stanza contained illegal XHTML-IM tag")); end return true; end end end -- Stanzas received from clients module:hook("pre-message/bare", message_handler, 71); module:hook("pre-message/full", message_handler, 71); module:hook("pre-message/host", message_handler, 71); -- Stanzas about to be delivered to clients module:hook("message/bare", message_handler, 71); module:hook("message/full", message_handler, 71);