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krb5-clients - Secure replacements for ftp, telnet and rsh using MIT Kerberos…  more info»

krb5-rsh.1.gz

RSH(1)                                                        RSH(1)



NAME
       rsh - remote shell

SYNOPSIS
       rsh  host  [-l  username] [-n] [-d] [-k realm] [-f | -F] [-x]
       [-PN | -PO] command

DESCRIPTION
       Rsh connects to the specified host, and executes  the  speci‐
       fied  command.   Rsh  copies its standard input to the remote
       command, the standard output of the  remote  command  to  its
       standard output, and the standard error of the remote command
       to its standard  error.   This  implementation  of  rsh  will
       accept  any  port  for the standard error stream.  Interrupt,
       quit and terminate signals are propagated to the remote  com‐
       mand; rsh normally terminates when the remote command does.

       Each  user  may  have  a private authorization list in a file
       .k5login in his login directory.   Each  line  in  this  file
       should  contain a Kerberos principal name of the form princi‐
       pal/instance@realm.  If there  is  a  ~/.k5login  file,  then
       access  is  granted  to the account if and only if the origi‐
       nater user is authenticated to one of the princiapls named in
       the ~/.k5login file.  Otherwise, the originating user will be
       granted access to the account if and only  if  the  authenti‐
       cated  principal  name of the user can be mapped to the local
       account name using the aname  ->  lname  mapping  rules  (see
       krb5_anadd(8) for more details).

OPTIONS
       -l username
              sets  the remote username to username.  Otherwise, the
              remote username will be the same as  the  local  user‐
              name.

       -x     causes  the  network  session traffic to be encrypted.
              This applies only to the input and output streams, and
              not the command line.

       -f     cause  nonforwardable  Kerberos credentials to be for‐
              warded to the remote machine for use by the  specified
              command.   They will be removed when command finishes.
              This option is mutually exclusive with the -F option.

       -F     cause forwardable Kerberos credentials to be forwarded
              to  the  remote  machine for use by the specified com‐
              mand.  They will be  removed  when  command  finishes.
              This option is mutually exclusive with the -f option.

       -k realm
              causes  rsh  to  obtain tickets for the remote host in
              realm instead of the remote host's realm as determined
              by krb_realmofhost(3).

       -d     turns  on  socket debugging (via setsockopt(2)) on the
              TCP sockets used for  communication  with  the  remote
              host.

       -n     redirects input from the special device /dev/null (see
              the BUGS section below).

       -PN

       -PO    Explicitly request new or old version of the  Kerberos
              ``rcmd'' protocol.  The new protocol avoids many secu‐
              rity problems found in the old one, but is not  inter‐
              operable with older servers.  (An "input/output error"
              and a closed connection is the most likely  result  of
              attempting  this  combination.)   If neither option is
              specified, some simple heuristics are  used  to  guess
              which to try.

       If  you omit command, then instead of executing a single com‐
       mand, you  will  be  logged  in  on  the  remote  host  using
       rlogin(1).

       Shell  metacharacters which are not quoted are interpreted on
       the local machine, while  quoted  metacharacters  are  inter‐
       preted on the remote machine.  Thus the command

          rsh otherhost cat remotefile >> localfile

       appends  the  remote file remotefile to the local file local‐
       file, while

          rsh otherhost cat remotefile ">>" otherremotefile

       appends remotefile to otherremotefile.

FILES
       /etc/hosts
       ~/.k5login  (on remote host) - file containing Kerberos prin‐
                   cipals that are allowed access.

SEE ALSO
       rlogin(1),  kerberos(3), krb_sendauth(3), krb_realmofhost(3),
       kshd(8)

BUGS
       If you are using csh(1) and put a rsh(1)  in  the  background
       without redirecting its input away from the terminal, it will
       block even if no reads are posted by the remote command.   If
       no  input  is desired you should redirect the input of rsh to
       /dev/null using the -n option.

       You cannot run  an  interactive  command  (like  rogue(6)  or
       vi(1)); use rlogin(1).

       Stop  signals  stop  the  local  rsh  process  only;  this is
       arguably wrong, but currently hard to  fix  for  reasons  too
       complicated to explain here.



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