Date: Tue, 24 Sep 2013 21:55:13 +0530 From: Dhiru Kholia <dhiru.kholia@...il.com> To: oss-security@...ts.openwall.com Subject: Reproducible Builds for Fedora Hi, I have been working on having Reproducible Builds in Fedora for some time. At this point, I think I have something demoable. Ensuring Reproducible Builds is a big task and I want your feedback, ideas, code and support. Please see https://github.com/kholia/ReproducibleBuilds for details. I would like to thank Debian and Ubuntu folks for starting similar projects (and inspiring this work). Reproducible Builds =================== It should be possible to reproduce every build of every package in Fedora. We want to be able to show that our binary was the result of our source code from our compiler and nobody added anything along the way. Can we (upstream / vendor) show that one of our rpms was built from the source we ship? It should be possible for the users to verify that the binary matches what the source intended to produce, in an independent fashion. We (the distribution provider) shouldn't be forced to say "Trust Us" to our users at all. Steps Involved ============== * Recording the build environment (DONE) - Koji does this automatically :-) * Re-producing the build environment (DONE) - Retrieve "brootid" (buildrootID) corresponding to the NVR we want to test from Koji (DONE) - Replicate this buildroot (DONE) - Create replica build environment using "Mock" (DONE) * Do re-builds locally using mock (DONE) * Verify new build against upstream (DONE, Steve's script works great) Current State ============= * Packages like git, john and qpdf are 100% reproducible as far as code is concerned :-) * We also support "Recursive Verification". For example, if building "Z" requires installing "Y" RPM, then, once we have verified that Z is OK, we can ask our tool to verify "Y" too and so on. Current Challenges ================== See http://tinyurl.com/ReproducibleBuildsProblems * python-epydoc will add timestamps to the HTML file it produces ( needs FIXING). * javadoc will add timestamps to the HTML file it produces (needs FIXING). Links ===== https://wiki.debian.org/ReproducibleBuilds http://fedoraproject.org/wiki/Releases/FeatureBuildId#Unique_build_ID http://blogs.kde.org/2013/06/19/really-source-code-software https://blog.torproject.org/blog/deterministic-builds-part-one-cyberwar-and-global-compromise https://trac.torproject.org/projects/tor/ticket/5837 https://trac.torproject.org/projects/tor/ticket/3688 http://bazaar.launchpad.net/~ubuntu-security/ubuntu-security-tools/trunk/files/head:/package-tools/ -- Dhiru
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