util.xml: Do not allow doctypes, comments or processing instructions
Yes. This is as bad as it sounds. CVE pending.
In Prosody itself, this only affects mod_websocket, which uses util.xml
to parse the <open/> frame, thus allowing unauthenticated remote DoS
using Billion Laughs. However, third-party modules using util.xml may
also be affected by this.
This commit installs handlers which disallow the use of doctype
declarations and processing instructions without any escape hatch. It,
by default, also introduces such a handler for comments, however, there
is a way to enable comments nontheless.
This is because util.xml is used to parse human-facing data, where
comments are generally a desirable feature, and also because comments
are generally harmless.
-- luacheck: ignore 212
local driver = {};
local driver_mt = { __index = driver };
function driver:open(store, typ)
if typ and typ ~= "keyval" and typ ~= "archive" then
return nil, "unsupported-store";
end
return setmetatable({ store = store, type = typ }, driver_mt);
end
function driver:get(user)
return {};
end
function driver:set(user, data)
return nil, "Storage disabled";
end
function driver:stores(username)
return { "roster" };
end
function driver:purge(user)
return true;
end
function driver:append()
return nil, "Storage disabled";
end
function driver:find()
return function () end, 0;
end
function driver:delete()
return true;
end
module:provides("storage", driver);