Software / code / prosody
Diff
core/xmlhandlers.lua @ 4276:a37522bf6b1b
xmlhandlers: Reject XML comments, processing instructions and (if supported by LuaExpat) DTDs. If not supported, log a warning. [Backport of 7cc426988bcc in trunk]
| author | Matthew Wild <mwild1@gmail.com> |
|---|---|
| date | Wed, 01 Jun 2011 23:20:54 +0100 |
| parent | 2923:b7049746bd29 |
| child | 4277:683523db4fe8 |
| child | 4280:65e2c089d138 |
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--- a/core/xmlhandlers.lua Tue May 18 23:28:36 2010 +0100 +++ b/core/xmlhandlers.lua Wed Jun 01 23:20:54 2011 +0100 @@ -19,6 +19,16 @@ local default_log = require "util.logger".init("xmlhandlers"); +-- COMPAT: w/LuaExpat 1.1.0 +local lxp_supports_doctype = pcall(lxp.new, { StartDoctypeDecl = false }); + +if not lxp_supports_doctype then + default_log("warn", "The version of LuaExpat on your system leaves Prosody " + .."vulnerable to denial-of-service attacks. You should upgrade to " + .."LuaExpat 1.1.1 or higher as soon as possible. See " + .."http://prosody.im/doc/depends#luaexpat for more information."); +end + local error = error; module "xmlhandlers" @@ -134,6 +144,18 @@ stanza:up(); end end + + local function restricted_handler() + cb_error(session, "parse-error", "restricted-xml", "Restricted XML, see RFC 6120 section 11.1."); + end + + if lxp_supports_doctype then + xml_handlers.StartDoctypeDecl = restricted_handler; + end + xml_handlers.Comment = restricted_handler; + xml_handlers.StartCdataSection = restricted_handler; + xml_handlers.ProcessingInstruction = restricted_handler; + return xml_handlers; end
