[Bug 786998] Re: /etc/shadow permissions changed after installation

[Launchpad Bug Tracker]

[Expired for isc-dhcp (Ubuntu) because there has been no activity for 60
days.]

** Changed in: isc-dhcp (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/786998

Title:
  /etc/shadow permissions changed after installation

Status in “isc-dhcp” package in Ubuntu:
  Expired

Bug description:
  Tracking down the problem that led to me filing bug #774273 brought me
  to the isc-dhcp-server package which was installed as a dhcp3-server
  dependency.  After installing the package, gnome-screensaver didn't
  work.  I found that this is because pam_unix uses unix_chkpwd when it
  doesn't have permissions to read /etc/shadow.  unix_chkpwd is setgid
  "shadow" and the /etc/shadow file is supposed to be read-only for the
  "shadow" group.

  At some point after the installation (but before the installation of
  any other package, according to etckeeper) the group was changed to
  "root" on /etc/shadow, breaking gnome-screensaver.

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