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-    ----------------------------------------------------------
-    | NOTE: This code might not work as expected, especially |
-    | when used with C2 (aka ENHANCED) security.             |
-    ----------------------------------------------------------
-
-This is an attempt at a SIA module for Kerberos. To install this you
-will have to do the following:
-
-* Make sure libsia_krb4.so is available in /usr/athena/lib. If
-  /usr/athena is not on local disk, you might want to put it in
-  /usr/shlib or someplace else. If you do, you'll have to edit
-  krb4_matrix.conf to reflect the new location.
-
-* Copy (your possibly edited) krb4_matrix.conf to /etc/sia.
-
-* Apply security.patch to /sbin/init.d/security
-
-* Turn on krb4 security by issuing `rcmgr set SECURITY KRB4' and
-  `rcmgr set KRB4_MATRIX_CONF krb4_matrix.conf'
-
-* Digital thinks you should reboot your machine, but that really
-  shouldn't be necessary.  It's usually sufficient just to run
-  /sbin/init.d/security
-
-Users with local passwords (like root) should be able to login safely.
-
-When using Digital's xdm the KRBTKFILE environment variable doesn't
-get passed along (since xdm zaps the environment). Instead you have to
-set KRBTKFILE to the correct value in /usr/lib/X11/xdm/Xsession. Add a
-line similar to
-
-KRBTKFILE=/tmp/tkt`id -u`_`ps -o ppid= -p $$`; export KRBTKFILE
-
-There is currently no support for changing kerberos passwords. Use
-kpasswd instead.
-
-NOTES to users with ENHANCED security
--------------------------------------
-
-Digital's ENHANCED (C2) security, and Kerberos solves two different
-problems. C2 deals with local security, and adds better control of who
-can do what, and adds auditing and similar things. Kerberos deals with
-network security.
-
-The C2 compatibility has not been extensively tested, simply because I
-don't use C2. To make C2 security work with Kerberos you will have to
-do the following.
-
-* Replace `krb4_matrix.conf' with `krb4+c2_matrix.conf' in the above
-  directions.
-
-* You must enable `vouching' in the `default' database.  This will
-  make C2 trust other SIA modules, so you can login without giving
-  your C2 password. To do this use `edauth' to edit the default entry
-  `/usr/tcb/bin/edauth -dd default', and add a
-  `d_accept_alternate_vouching' capability, if not already present.
-
-* For each user that does *not* have a C2 password, you should set the
-  password expiration field to zero. You can do this for each user, or
-  in the `default' table. To to this use `edauth' to set (or change)
-  the `u_exp' capability to `u_exp#0'.
-
-* (optional) Change the entry for telnet in `/etc/inetd.conf' to
-  explicitly use Digital's login program. You can do this by adding
-  `-L /bin/login' at the end of the line. This way users with local
-  passwords will get warnings about expiring passwords and such.
-
-REMEMBER, if you do these changes you will get a system that most
-certainly does *not* fulfill the requirements of a C2 system. If C2 is
-what you want, for instance if someone else is forcing you to use it,
-you're out of luck.  If you use ENHANCED security because you want a
-system that is more secure than it would otherwise be, you probably
-got an even more secure system. Passwords will not be sent in the
-clear, for instance.