But this doesn't solve the specific xz problem. That one requires different kinds of defense techniques.
On 3/31/24 08:10, Carlos Rodriguez-Fernandez wrote:
Going in that same route, if 2FA becomes mandatory, then we have a stronger defense of the GPG public key in the user profile. The attacker would need not only the credentials, but the 2FA device to change the public GPG.That then makes one step further possible: enforce commit signing on the downstream project. That makes authorship of changes non repudiateable (that is, important changes like `sources`, all patches, specs, etc...), and also allows the build to check that all commits between the last release and the current build are signed by the committers of the project. This can be done by having the build importing the public GPGs of the committers of the downstream project from pagure/FAS and checking, again, the commits since the last release. The downstream project *source code* would be effectively signed, so the signed rpm then would carry even a higher assurance: "this artifact was built by Fedora Infrastructure", but also "all the downstream sources used to make it are assuredly coming from the maintainers."It is definitely an additional hassle for the maintainers, but there is value in it, especially in this day and age.On 3/31/24 01:58, Adam Williamson wrote:On Sat, 2024-03-30 at 09:37 +0000, Richard W.M. Jones wrote:I'm not pretending these will solve everything, but they should make attacks a little harder in future.I don't disagree with Richard's list. However...more in regards to some of the grandiose ideas in later posts than Richard's list...I think we're in danger of building castles in the sky while not cleaning up the poop in our backyard, here. Before we start in on the grand fantasies about converting the world off autotools or banning binaries in repos or centralized source depots authenticated by a committee of Top People, can we remember: 1. We *still don't have compulsory 2FA for Fedora packagers*. We *still don't have compulsory 2FA for Fedora packagers*. *WE STILL DON'T HAVE COMPULSORY 2FA FOR FEDORA PACKAGERS*. 2. Our process for vetting packagers is, let's face it, from a security perspective almost *comically* patchy. There are 140 sponsors in the packager FAS group. Any one of those people - or someone who compromises any one of those 140 accounts - can grant any other person on earth Fedora packager status. Our policy on how they should do this is https://docs.fedoraproject.org/en-US/package-maintainers/How_to_Sponsor_a_New_Contributor/#sponsoring_someone_for_fedora_package_collection . The words "trust" and "identity" do not appear in it. There is, AFAIK, no policy or procedure by which inactive sponsors have this power removed. There is no mandatory 2FA policy for sponsors. 3. We have no mechanism to flag when J. Random Packager adds "Supplements: glibc" to their random leaf node package. As a reminder, *we are a project that allows 1,601 minimally-vetted people to deliver arbitrary code executed as root on hundreds of thousands of systems*, and this mechanism allows any one of those people to cause the package they have complete control over to be automatically pulled in as a dependency on virtually every single one of those systems. 4. Our main auth system was written years ago by someone who no longer contributes and nobody is really actively maintaining it[0]. These are just the ones that leap to my tired mind at this moment. I'm sure we can think of many more things we should probably look at before we start pontificating (or, worse, lecturing) about how things should be done upstream of us. [0]: https://pagure.io/ipsilon/commits/master
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