= Proposed System Wide Change: Switch libidn-using applications to IDNA2008 = https://fedoraproject.org/wiki/Changes/IDNA2008 Change owner(s): * Nikos Mavrogiannopoulos <nmav AT redhat DOT com> * Robert Scheck <robert AT fedoraproject DOT org> The proposed change is about deprecating libidn, which supports IDNA2003, and switch all applications using libidn, to libidn2 2.0.0, which supports IDNA2008. == Detailed Description == Internationalized domain names exist for quite some time (IDNA2003), although the protocols describing them have evolved in an incompatible way (IDNA2008). These incompatibilities will prevent applications written for IDNA2003 to access certain problematic domain names defined with IDNA2008, e.g., faß.de is translated to domain xn--fa-hia.de with IDNA2008, while in IDNA2003 it is translated to fass.de domain. That not only causes incompatibility problems, but may be used as an attack vector to redirect users to different web sites. The proposed change is about deprecating libidn, which supports IDNA2003, and switch all applications using libidn, to libidn2 2.0.0, which supports IDNA2008. The switch should be transparent as the libidn2 library is API compatible. Note that even in the web browsers, field there is much confusion on the topic. Chromium appears to use IDNA2008 transitional (i.e., IDNA2003 mapping for the problematic characters), while Firefox and Safari have already moved to IDNA2008. For more information see: * http://nmav.gnutls.org/2017/04/the-mess-with-internationalized-domain.html * https://www.plesk.com/blog/what-is-the-problem-with-s/ * http://unicode.org/faq/idn.html#6 == Scope == * Proposal owners: The proposal owner is expected to co-ordinate and fill the required bugs on the distribution. * Other developers: Maintainers, should - Verify that their software is linked with the libidn library - Update the software from upstream if it already has been converted to libidn2 - Check the libidn2 instructions on converting a package to libidn2. - Propose patches (trivial task) to convert to libidn2, and notify upstream about it. In short switch software from libidn to libidn2, it is sufficient replacing idna.h header with idn2.h. * Release engineering: This feature requires not action from release engineering. * List of deliverables: This will bring: - An updated libidn2 library <- already in F25 - A switch of all applications to libidn2 - libidn will be deprecated but not removed as applications may explicitly require IDNA2003 support (e.g., for compatibility) * Policies and guidelines: Currently Fedora has no guidelines for IDNA support. With this change the recommended guideline for applications would be to support IDNA2008 by default. * Trademark approval: N/A (not needed for this Change) -- Jan Kuřík Platform & Fedora Program Manager Red Hat Czech s.r.o., Purkynova 99/71, 612 45 Brno, Czech Republic _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx
