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[Simon Chopin <2087827@xxxxxxxxxxxxxxxxxx>]

** Also affects: pam (Ubuntu Oracular)
   Importance: Undecided
       Status: New

** Also affects: pam (Ubuntu Plucky)
   Importance: Undecided
       Status: New

** Also affects: pam (Ubuntu Questing)
   Importance: High
       Status: Triaged

** Also affects: pam (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Changed in: pam (Ubuntu Questing)
       Status: Triaged => Fix Released

** Changed in: pam (Ubuntu Questing)
       Status: Fix Released => Fix Committed

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https://bugs.launchpad.net/bugs/2087827

Title:
  Pam includes does not look in /usr/lib/pam.d

Status in pam package in Ubuntu:
  Fix Committed
Status in pam source package in Noble:
  New
Status in pam source package in Oracular:
  New
Status in pam source package in Plucky:
  New
Status in pam source package in Questing:
  Fix Committed

Bug description:
  Hey!

  We're using libpam in the Ubuntu Core rootfs for the core24 snap
  (which is pam from Noble). We've run into a sitaution where we would
  like to move pam.d files into /usr/lib/pam.d instead of /etc/pam.d,
  and looking at man pages this should be supported. (I.e it always
  checks /etc/pam.d first, then /usr/lib/pam.d).

  However, there seems to be an issue (or misunderstanding) in terms of
  how `include`'s are loaded. For an installation that has all pam.d
  files in /usr/lib we get this error:

  ```
  [  556.375377] sshd[3553]: PAM _pam_load_conf_file: unable to open config for /etc/pam.d/common-auth
  [  556.377644] sshd[3553]: PAM error loading (null)
  [  556.379731] sshd[3553]: PAM _pam_init_handlers: error reading /usr/lib/pam.d/sshd
  [  556.382681] sshd[3553]: PAM _pam_init_handlers: [Critical error - immediate abort]
  [  556.384512] sshd[3553]: PAM error reading PAM configuration file
  [  556.386397] sshd[3553]: PAM pam_start: failed to initialize handlers
  [  556.389716] sshd[3553]: PAM pam_end: NULL pam handle passed
  [  556.393755] sshd[3553]: fatal: PAM: initialisation failed

  ```

  It seems to correctly read sshd from /usr/lib/pam.d/, however the
  includes it seems it insists on loading through /etc/pam.d. Looking at
  the code:
  https://git.launchpad.net/ubuntu/+source/pam/tree/libpam/pam_handlers.c?h=applied/ubuntu/noble#n227
  it seems that it only checks /etc/pam.d, and not /usr/lib/pam.d. This
  seems to not be in line with the man pages?

  *note* this seem at first glance that there might be a bug in the
  patch `debian/patches/031_pam_include`

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