On Thu, 23 Jan 2020 at 12:16, Dimitri John Ledkov <[email protected]> wrote: > > On Thu, 23 Jan 2020 at 14:01, Nikos Mavrogiannopoulos <[email protected]> wrote: > > > > On Wed, Jan 22, 2020 at 3:42 PM Brandon Sawyers <[email protected]> wrote: > > > > > > Hello everyone: > > > > > > A recent package upgrade in ubuntu 1604 (v3.4.10-4ubuntu1.6) and 1804 > > > (v3.5.18-1ubuntu1.2) has left us without SHA1 support. Since we are still > > > in the process of migrating our last services off of SHA1 with a target > > > date of April this has put us in a pickle. > > > > > > From reading the docs I expect I should be able to use priority and allow > > > SHA1 to function, however making this work has been rather frustrating. > > > > > > I've tried several different versions of the following command but I > > > would expect just having "NORMAL:+SIGN-RSA-SHA1:+SHA1" priority set > > > should work. > > > > > > `gnutls-bin --x509cafile ./cachain-with-sha1-signed-cert.pem > > > --priority='NORMAL:+SIGN-RSA-SHA1:+SHA1' -p 636 internal.directory.org` > > > > Have you tried appending %VERIFY_ALLOW_SIGN_WITH_SHA1? The available > > priority strings are documented in: > > https://gnutls.org/manual/html_node/Priority-Strings.html > > > > From what I can tell is that the backports do not include that > flag.... I'm escalating this, as this is regression-security as I do > not believe that upstream code is affected as this is an issue in the > patch set released in ubuntu. > > I hope to move this discussion downstream to > https://bugs.launchpad.net/ubuntu/+source/gnutls28/+bug/1860656 >
To close this out, a further update got published to the affected releases which adds support to use "%VERIFY_ALLOW_BROKEN" and "%VERIFY_ALLOW_SIGN_WITH_SHA1" in the priority string option, allowing one to re-enable obsoleted hashes in certificate signatures. But please upgrade your certificates to use SHA256 nonetheless as progressively more software will start outright reject SHA1 certificates without a way to turn them back on. -- Regards, Dimitri. _______________________________________________ Gnutls-help mailing list [email protected] http://lists.gnupg.org/mailman/listinfo/gnutls-help
