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mod_xhtmlim/mod_xhtmlim.lua @ 5170:4d6af8950016
mod_muc_moderation: Derive role from reserved nickname if occupant
When using a different client to moderate than the one used to
participate in the chat, e.g. a command line tool like clix, there's no
occupant and no role to use in the permission check. Previously the
default role based on affiliation was used. Now if you are present in
the room using your reserved nick, the role you have there is used in
the permission check instead of the default affiliation-derived role.
author | Kim Alvefur <zash@zash.se> |
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date | Sun, 19 Feb 2023 18:17:37 +0100 |
parent | 3699:1f68287138e3 |
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-- 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);