[Bug 2068729] Re: pam_radius_auth: Failed to open RADIUS IPv6 socket: Address family not supported by protocol

[Real Ursus]

If we set aside the specific terminology for a moment, it appears that the version of the software available on GitHub is functioning as expected, while the version available through the “apt” package manager is not. 
My recommendation would be to consider updating the “apt” package directly, without the need to involve any personal or third-party “PPA”. 
I hope this suggestion proves helpful.

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https://bugs.launchpad.net/bugs/2068729

Title:
  pam_radius_auth: Failed to open RADIUS IPv6 socket: Address family not
  supported by protocol

Status in libpam-radius-auth package in Ubuntu:
  Triaged
Status in shadow package in Ubuntu:
  New

Bug description:
  New and fully updated 24.04 LTS with disabled IPv6 (The CISA secure
  config states that IPv6 is to be disabled unless it's in use).

  lsb_release -rd:
  No LSB modules are available.
  Description:    Ubuntu 24.04 LTS
  Release:        24.04

  apt-cache policy libpam-radius-auth
  libpam-radius-auth:
    Installed: 2.0.1-1
    Candidate: 2.0.1-1
    Version table:
   *** 2.0.1-1 500
          500 http://au.archive.ubuntu.com/ubuntu noble/universe amd64 Packages
          100 /var/lib/dpkg/status

  What you expected to happen:
  Based on https://github.com/FreeRADIUS/pam_radius/blob/master/src/pam_radius_auth.c, the pam_radius_auth module must support ipv6 and ipv4 options.

  /etc/pam.d/sshd:
  auth       sufficient   pam_radius_auth.so  conf=/etc/pam_radius_auth.conf retry=3 ipv4=yes ipv6=no debug

  What happened instead:
  2024-06-07T22:07:57.499460+10:00 ubuntu sshd[584305]: pam_radius_auth: 2.0.1, built on Aug 19 2023 at 14:08:42
  2024-06-07T22:07:57.499672+10:00 ubuntu sshd[584305]: pam_radius_auth: unrecognized option 'ipv4=yes'
  2024-06-07T22:07:57.499880+10:00 ubuntu sshd[584305]: pam_radius_auth: unrecognized option 'ipv6=no'
  2024-06-07T22:07:57.500051+10:00 ubuntu sshd[584305]: pam_radius_auth: DEBUG: conf_file='/etc/pam_radius_auth.conf' use_first_pass=no try_first_pass=no skip_passwd=no retry=3 localifdown=no client_id='' accounting_bug=no ruser=no prompt='Password: ' force_prompt=no prompt_attribute=no max_challenge=0 privilege_level=no
  2024-06-07T22:07:57.500279+10:00 ubuntu sshd[584305]: pam_radius_auth: Got user name: 'test'
  2024-06-07T22:07:57.502892+10:00 ubuntu sshd[584305]: pam_radius_auth: Failed to open RADIUS IPv6 socket: Address family not supported by protocol

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