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  library-mediated password change of an expired password.  This is fixed
  in later releases of Heimdal.

  To run the full test suite, Perl 5.10 or later is required.  The
  following additional Perl modules will be used if present:

  * Test::Pod
  * Test::Spelling

  All are available on CPAN.  Those tests will be skipped if the modules
  are not available.

  To enable tests that don't detect functionality problems but are used to
  sanity-check the release, set the environment variable RELEASE_TESTING
  to a true value.  To enable tests that may be sensitive to the local
  environment or that produce a lot of false positives without uncovering
  many problems, set the environment variable AUTHOR_TESTING to a true
  value.

CONFIGURING

  Just installing the module does not enable it or change anything about
  your system authentication configuration.  To use the module for all
  system authentication on Debian systems, put something like:

      auth  sufficient   pam_krb5.so minimum_uid=1000
      auth  required     pam_unix.so try_first_pass nullok_secure

  in /etc/pam.d/common-auth, something like:

      session  optional  pam_krb5.so minimum_uid=1000
      session  required  pam_unix.so

  in /etc/pam.d/common-session, and something like:

      account  required  pam_krb5.so minimum_uid=1000
      account  required  pam_unix.so

  in /etc/pam.d/common-account.  The minimum_uid setting tells the PAM
  module to pass on any users with a UID lower than 1000, thereby
  bypassing Kerberos authentication for the root account and any system
  accounts.  You normally want to do this since otherwise, if the network
  is down, the Kerberos authentication can time out and make it difficult
  to log in as root and fix matters.  This also avoids problems with
  Kerberos principals that happen to match system accounts accidentally
  getting access to those accounts.

  Be sure to include the module in the session group as well as the auth
  group.  Without the session entry, the user's ticket cache will not be
  created properly for ssh logins (among possibly others).

  If your users should normally all use Kerberos passwords exclusively,
  putting something like:

      password sufficient pam_krb5.so minimum_uid=1000
      password required   pam_unix.so try_first_pass obscure md5

  in /etc/pam.d/common-password will change users' passwords in Kerberos
  by default and then only fall back on Unix if that doesn't work.  (You
  can make this tighter by using the more complex new-style PAM
  configuration.)  If you instead want to synchronize local and Kerberos
  passwords and change them both at the same time, you can do something
  like:

      password required   pam_unix.so obscure sha512
      password required   pam_krb5.so use_authtok minimum_uid=1000

  If you have multiple environments that you want to synchronize and you
  don't want password changes to continue if the Kerberos password change
  fails, use the clear_on_fail option.  For example:

      password required   pam_krb5.so clear_on_fail minimum_uid=1000
      password required   pam_unix.so use_authtok obscure sha512
      password required   pam_smbpass.so use_authtok

  In this case, if pam_krb5 cannot change the password (due to password
  strength rules on the KDC, for example), it will clear the stored
  password (because of the clear_on_fail option), and since pam_unix and
  pam_smbpass are both configured with use_authtok, they will both fail.
  clear_on_fail is not the default because it would interfere with the
  more common pattern of falling back to local passwords if the user
  doesn't exist in Kerberos.

  If you use a more complex configuration with the Linux PAM [] syntax for
  the session and account groups, note that pam_krb5 returns a status of
  ignore, not success, if the user didn't log on with Kerberos.  You may
  need to handle that explicitly with ignore=ignore in your action list.

  There are many, many other possibilities.  See the Linux PAM
  documentation for all the configuration options.

  On Red Hat systems, modify /etc/pam.d/system-auth instead, which
  contains all of the configuration for the different stacks.

  You can also use pam-krb5 only for specific services.  In that case,
  modify the files in /etc/pam.d for that particular service to use
  pam_krb5.so for authentication.  For services that are using passwords
  over TLS to authenticate users, you may want to use the ignore_k5login
  and no_ccache options to the authenticate module.  .k5login
  authorization is only meaningful for local accounts and ticket caches
  are usually (although not always) only useful for interactive sessions.

  Configuring the module for Solaris is both simpler and less flexible,
  since Solaris (at least Solaris 8 and 9, which are the last versions of
  Solaris with which this module was extensively tested) use a single
  /etc/pam.conf file that contains configuration for all programs.  For
  console login on Solaris, try something like:

      login auth sufficient /usr/local/lib/security/pam_krb5.so minimum_uid=100
      login auth required /usr/lib/security/pam_unix_auth.so.1 use_first_pass
      login account required /usr/local/lib/security/pam_krb5.so minimum_uid=100
      login account required /usr/lib/security/pam_unix_account.so.1
      login session required /usr/local/lib/security/pam_krb5.so retain_after_close minimum_uid=100
      login session required /usr/lib/security/pam_unix_session.so.1

  A similar configuration could be used for other services, such as ssh.
  See the pam.conf(5) man page for more information.  When using this
  module with Solaris login (at least on Solaris 8 and 9), you will
  probably also need to add retain_after_close to the PAM configuration to
  avoid having the user's credentials deleted before they are logged in.

  The Solaris Kerberos library reportedly does not support prompting for a
  password change of an expired account during authentication.  Supporting
  password change for expired accounts on Solaris with native Kerberos may
  therefore require setting the defer_pwchange or force_pwchange option
  for selected login applications.  See the description and warnings about
  that option in the pam_krb5(5) man page.