[Bug 1917920] Re: magic-proxy broke with iptables 1.8.7-1ubuntu2

[Thomas Bechtold]

** Changed in: livecd-rootfs (Ubuntu Hirsute)
     Assignee: (unassigned) => Thomas Bechtold (toabctl)

** Changed in: livecd-rootfs (Ubuntu Focal)
     Assignee: (unassigned) => Thomas Bechtold (toabctl)

** Changed in: livecd-rootfs (Ubuntu Bionic)
     Assignee: (unassigned) => Thomas Bechtold (toabctl)

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https://bugs.launchpad.net/bugs/1917920

Title:
  magic-proxy broke with iptables 1.8.7-1ubuntu2

Status in launchpad-buildd:
  Invalid
Status in iptables package in Ubuntu:
  Invalid
Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in lxd package in Ubuntu:
  Invalid
Status in iptables source package in Bionic:
  Invalid
Status in livecd-rootfs source package in Bionic:
  New
Status in lxd source package in Bionic:
  Invalid
Status in iptables source package in Focal:
  Invalid
Status in livecd-rootfs source package in Focal:
  New
Status in lxd source package in Focal:
  Invalid
Status in iptables source package in Hirsute:
  Invalid
Status in livecd-rootfs source package in Hirsute:
  New
Status in lxd source package in Hirsute:
  Invalid

Bug description:
  [Impact]
  The fixes for this bug (including the fixes for LP:#1944906) need to be backported to hirsute, focal and bionic) to be able to re-enable  the "repo-snapshot-stamp" feature for image builds. That feature is important to get consistent image builds (means the same set of packages included in the different images) when doing multiple builds (eg. for AWS, Azure and GCE).

  [Test Plan]
  - build a livecd-rootfs image with the changes for every series in a PPA
  - Do build an image with the livecd-rootfs from the PPA and enable the repo-snapshot-stamp feature
  - Check that the build did not fail or hang

  [Where problems could occur]
  The codepath that will be changed is only executed in livecd-rootfs if the repo-snapshot-stamp feature is enabled. And that feature is currently broken so it shouldn't be enabled anywhere.

  [Original description]

  when iptables got upgraded from 1.8.5-3ubuntu4 to 1.8.7-1ubuntu2 magic
  proxy stopped working in livecd-rootfs.

  It does very simple thing:

  iptables -t nat -A OUTPUT -p tcp --dport 80 -m owner ! --uid-owner
  daemon -j REDIRECT --to 8080

  inside hirsute lxd container, with quite high privileges, in a bionic
  VM, running 4.15 kernel.

  With 1.8.5 above worked fine, with 1.8.7 somehow there was no outbound
  connectivity the very first http networking command after the above
  call would just hang indefinitely.

  However, if one does this instead:

  iptables -vv -t nat -S
  iptables-legacy -vv -t nat -S
  iptables -vv -t nat -A OUTPUT -p tcp --dport 80 -m owner ! --uid-owner daemon -j REDIRECT --to 8080

  somehow magically everything starts to work fine.

  weird.

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