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SSERVER(8)                       MIT Kerberos                       SSERVER(8)

NAME
       sserver - sample Kerberos version 5 server

SYNOPSIS
       sserver [ -p port ] [ -S keytab ] [ server_port ]

DESCRIPTION
       sserver and sclient(1) are a simple demonstration client/server
       application.  When sclient connects to sserver, it performs a Kerberos
       authentication, and then sserver returns to sclient the Kerberos
       principal which was used for the Kerberos authentication.  It makes a
       good test that Kerberos has been successfully installed on a machine.

       The service name used by sserver and sclient is sample.  Hence, sserver
       will require that there be a keytab entry for the service
       sample/hostname.domain.name@REALM.NAME.  This keytab is generated using
       the kadmin(1) program.  The keytab file is usually installed as
       FILE:/etc/krb5.keytab.

       The -S option allows for a different keytab than the default.

       sserver is normally invoked out of inetd(8), using a line in
       /etc/inetd.conf that looks like this:

          sample stream tcp nowait root /usr/local/sbin/sserver sserver

       Since sample is normally not a port defined in /etc/services, you will
       usually have to add a line to /etc/services which looks like this:

          sample          13135/tcp

       When using sclient, you will first have to have an entry in the
       Kerberos database, by using kadmin(1), and then you have to get
       Kerberos tickets, by using kinit(1).  Also, if you are running the
       sclient program on a different host than the sserver it will be
       connecting to, be sure that both hosts have an entry in /etc/services
       for the sample tcp port, and that the same port number is in both
       files.

       When you run sclient you should see something like this:

          sendauth succeeded, reply is:
          reply len 32, contents:
          You are nlgilman@JIMI.MIT.EDU

COMMON ERROR MESSAGES

       1. kinit returns the error:

             kinit: Client not found in Kerberos database while getting
                    initial credentials

          This means that you didn't create an entry for your username in the
          Kerberos database.

       2. sclient returns the error:

             unknown service sample/tcp; check /etc/services

          This means that you don't have an entry in /etc/services for the
          sample tcp port.

       3. sclient returns the error:

             connect: Connection refused

          This probably means you didn't edit /etc/inetd.conf correctly, or
          you didn't restart inetd after editing inetd.conf.

       4. sclient returns the error:

             sclient: Server not found in Kerberos database while using
                      sendauth

          This means that the sample/hostname@LOCAL.REALM service was not
          defined in the Kerberos database; it should be created using
          kadmin(1), and a keytab file needs to be generated to make the key
          for that service principal available for sclient.

       5. sclient returns the error:

             sendauth rejected, error reply is:
                 "No such file or directory"

          This probably means sserver couldn't find the keytab file.  It was
          probably not installed in the proper directory.

ENVIRONMENT
       See kerberos(7) for a description of Kerberos environment variables.

SEE ALSO
       sclient(1), kerberos(7), services(5), inetd(8)

AUTHOR
       MIT

COPYRIGHT
       1985-2023, MIT

1.21.2                                                              SSERVER(8)