On 5/3/22 18:41, David Woodhouse wrote: > On Mon, 2022-05-02 at 19:33 +0200, Clemens Lang wrote: >> This is the reason why the proposal contains extensive methods to test >> whether things are going to break by modifying the crypto-policy or using >> bpftrace. Unfortunately there are hundreds of packages that depend on >> cryptographic libraries, and millions of different configurations out there. >> We can’t know ahead of time which ones of them are going to break, but the >> proposal provides tools and a long transition period to identify and fix >> them. > > When changes like this broke things for users in the past, we talked > about a way to present the "insufficient crypto/digest/protocol" as > just another failure like server certificate validation failures, so > the application/user can *choose* to accept and proceed, in real time. > > I'd like to see that as a *condition* of acceptance of further > restrictions in the policy.
Agreed — with one caveat. It is quite possible that support for some ancient protocols may be outright removed from upstream projects. In that case, there is nothing Fedora can do. > I really don't want us continuing to break things for Fedora users and > driving them back to the proprietary VPN clients. > > I am pleased to see some progress on this front with > https://fedoraproject.org/wiki/Changes/GnutlsAllowlisting but it isn't > clear to me that this gives us what we need. We *want* to warn users > that their VPN server doesn't meet modern crypto standards. We don't > want to just blindly re-enable ancient crap and have it silently work. > But we also do *need* it to work, after we've warned the user about it. > > Which is why handling it like a certificate validation failure seems to > be the right answer, but I'm happy to explore other solutions... but > preferably *not* solutions like "manually set > GNUTLS_SYSTEM_PRIORTY_FILE=/dev/null in your Fedora package to > explicitly override all the Fedora crypto policies". That suggestion > made me sad... :) I agree wholeheartedly. -- Sincerely, Demi Marie Obenour (she/her/hers)
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