Include warning of weak ciphers used by k5srvutil change

[wiki.git] / doc / kerberized-server.mdwn

diff --git a/doc/kerberized-server.mdwn b/doc/kerberized-server.mdwn
index 953075953a64d85c459f6e9734cb74abbd1a3a3f..763f8ead7f15b628368e6a1419177a4abbc2c8ec 100644 (file)
--- a/doc/kerberized-server.mdwn
+++ b/doc/kerberized-server.mdwn
@@ -15,6 +15,9 @@ and then **set a new (random) key**.
     # k5srvutil change
     # k5srvutil delold
 
+Note that the `k5srvutil` command will also generate keys for the DES and RC4 ciphers, which are considered weak.
+You are strongly advised to read the "Upgrading cryptographic strength" section below on how to generate only AES keys instead.
+
 If you're using Debathena, you can install the `debathena-ssh-server-config` package to configure Kerberos authentication on the server side. If not, make sure your `/etc/ssh/sshd_config` file includes the lines
 
     GSSAPIAuthentication yes
@@ -46,7 +49,7 @@ To change the supported enctypes, run `kadmin`:
 
 From within `kadmin`, to create new keys:
 
-    ktadd -k daemon.kronborg.keytab -e aes256-cts:normal -e aes128-cts:normal daemon/kronborg.mit.edu
+    ktadd -k daemon.kronborg.keytab -e aes256-cts:normal,aes128-cts:normal daemon/kronborg.mit.edu
 
 After all tickets currently issued against your service expire (which will happen after at most one day), you should remove the old keys from your keytab. If there are no outstanding tickets, you can do this from within `kadmin`: