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[Dimitri John Ledkov <launchpad@xxxxxxxxxxxx>]

** No longer affects: debian-archive-keyring (Ubuntu Vivid)

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https://bugs.launchpad.net/bugs/1685305

Title:
  Debian keys should not be trusted by default

Status in debian-archive-keyring package in Ubuntu:
  New
Status in debian-archive-keyring source package in Trusty:
  New
Status in debian-archive-keyring source package in Xenial:
  New
Status in debian-archive-keyring source package in Yakkety:
  New
Status in debian-archive-keyring source package in Zesty:
  New
Status in debian-archive-keyring source package in Artful:
  New

Bug description:
  [Impact]

   * debian-archive-keyring provides Debian Archive keys in two formats/locations:
     - /usr/share/keyrings/debian-archive-keyring.gpg
     - /etc/apt/trusted.gpg.d/*.gpg snippets

     The first location is used by many development tools to validate Debian
     mirrors when creating chroots/containers of Debian releases.

     The latter one is used by apt to validate and trust repositories.

     Ubuntu and Debian releases are, often, binary incompatible with each other,
     therefore by default on Ubuntu systems apt should not trust Debian Archive keys,
     when one simply wants to have ability to verify Debian releases on a Ubuntu system.

     Furthermore, debian-archive-keyring is often not installed explicitly but pulled in
     as a dependency. Thus the presence of debian-archive-keyring cannot be treated as
     consent to trust Debian archive keys by default.

  [Test Case]

   * Install debian-archive-keyring
   * Verify that Debian keys are listed in the output of $ apt-key list
   * Upgrade debian-archive-keyring
   * Verify that Debian keys are no longer present in the output of $ apt-key list

  [Regression Potential]

   * Users that rely on hosts' system to trust Debian archive keys, will no longer do.
   * As a workaround those users should symlink
     /usr/share/keyrings/debian-archive-keyring.gpg into /etc/apt/trusted.gpg.d/
   * Maybe we should provide a package "debian-archive-keyring-trusted" which will
     ship the trusted.gpg.d snippets and make host systems trust Debian keys. But I
     do not believe there is a demand for that.

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