rlogin - remote login

NAME

       rlogin - remote login

SYNOPSIS

       rlogin  rhost  [-ec]  [-8] [-c] [ -a] [-f] [-F] [-t termtype] [-n] [-7]
       [-PN | -PO] [-d] [-k realm] [-x] [-L] [-l username]

DESCRIPTION

Rlogin connects your terminal on the current local host system lhost to
the remote host system rhost.

The version built to use Kerberos authentication is very similar to the
standard Berkeley rlogin(1), except that instead of the rhosts
mechanism, it uses Kerberos authentication to determine the
authorization to use a remote account.

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 principal/instance@realm. If the
originating user is authenticated to one of the principals named in
.k5login, access is granted to the account. If there is no /.k5login
file, the principal will be granted access to the account according to
the aname->lname mapping rules. (See krb5_anadd(8) for more details.)
Otherwise a login and password will be prompted for on the remote
machine as in login(1). To avoid some security problems, the .k5login
file must be owned by the remote user.

If there is some problem in marshaling the Kerberos authentication
information, an error message is printed and the standard UCB rlogin is
executed in place of the Kerberos rlogin.

A line of the form ‘‘~.’’ disconnects from the remote host, where ‘‘~’’
is the escape character. Similarly, the line ‘‘~^Z’’ (where ^Z,
control-Z, is the suspend character) will suspend the rlogin session.
Substitution of the delayed-suspend character (normally ^Y) for the
suspend character suspends the send portion of the rlogin, but allows
output from the remote system.

The remote terminal type is the same as your local terminal type (as
given in your environment TERM variable), unless the -t option is
specified (see below). The terminal or window size is also copied to
the remote system if the server supports the option, and changes in
size are reflected as well.

All echoing takes place at the remote site, so that (except for delays)
the rlogin is transparent. Flow control via ^S and ^Q and flushing of
input and output on interrupts are handled properly.

OPTIONS

       -8     allows an eight-bit input data  path  at  all  times;  otherwise
              parity  bits are stripped except when the remote side’s stop and
              start characters are other than ^S/^Q.  Eight-bit  mode  is  the
              default.

       -L     allows the rlogin session to be run in litout mode.

       -ec    sets  the  escape  character to c.  There is no space separating
              this option flag and the new escape character.

       -c     require confirmation before disconnecting via ‘‘~.’’

       -a     force the remote machine to ask for a password by sending a null
              local  username.   This option has no effect unless the standard
              UCB rlogin is executed in place  of  the  Kerberos  rlogin  (see
              above).

       -f     forward a copy of the local credentials to the remote system.

       -F     forward  a  forwardable  copy  of  the  local credentials to the
              remote system.

       -t termtype
              replace the  terminal  type  passed  to  the  remote  host  with
              termtype.

       -n     prevent suspension of rlogin via ‘‘~^Z’’ or ‘‘~^Y’’.

       -7     force seven-bit transmissions.

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

       -k     request rlogin to obtain tickets for the remote  host  in  realm
              realm  instead  of  the  remote  host’s  realm  as determined by
              krb_realmofhost(3).

       -x     turn on DES encryption for data passed via the  rlogin  session.
              This  applies  only to input and output streams, so the username
              is sent unencrypted.  This significantly reduces  response  time
              and significantly increases CPU utilization.

       -PN

       -PO    Explicitly  request  new or old version of the Kerberos ‘‘rcmd’’
              protocol.  The new protocol avoids many security problems  found
              in  the  old  one,  but is not interoperable 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.

FILES

       ~/.k5login  (on remote host) - file containing Kerberos principals that
                   are allowed access.

BUGS