NAME
rlogin - remote login
SYNOPSIS
rlogin rhost [-ec] [-8] [-c] [ -a] [-f | --forward]
[--noforward] [-F | --forwardable] [--noforwardable] [--For-
wardable] [--noForwardable] [-t termtype] [-n] [-7] [-d] [-k
realm] [-x | --encrypt] [--noencrypt] [--noflow] [-L] [-l
username] [--version]
DESCRIPTION
Rlogin connects your terminal on the current local host sys-
tem 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 authenti-
cation 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 authen-
tication 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; oth-
erwise 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 charac-
ter.
-c require confirmation before disconnecting via ``~.''
-a force the remote machine to ask for a password by send-
ing 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
forward a copy of the local credentials to the remote
system.
--noforward
disables ticket forwarding. This is useful for over-
riding the application defaults in the host's
krb5.conf(5) file.
-F | --forwardable
forward a forwardable copy of the local credentials to
the remote system.
--Forwardable
forward a forwardable copy of the local credentials to
the remote system.
--noforwardable
makes any forwarded tickets non-forwardable. This is
useful for overriding the application defaults in the
host's krb5.conf(5) file.
--noForwardable
makes any forwarded tickets non-forwardable. This is
useful for overriding the application defaults in the
host's krb5.conf(5) file.
-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.
--noflow
force transmission of flow control characters (^S/^Q)
to the remote system.
-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 | --encrypt
turn on DES encryption for all data passed via the rlo-
gin session. This significantly reduces response time
and significantly increases CPU utilization.
--noencrypt
disables encryption. This is useful for overriding the
application defaults in the host's krb5.conf(5) file.
--version
Prints out the KerbNet release version of the binary
and then exits.
CONFIGURATION
The following defaults may be specified in the [appdefaults]
or [realms] section of the krb5.conf(5) file:
forwardable Whether or not any forwarded tickets should
be forwardable. Takes a boolean argument.
forward Whether or not to forward tickets to the
remote host. Takes a boolean argument.
encrypt Whether or not to encrypt the data stream.
Takes a boolean argument.
For example:
[appdefaults]
rlogin = {
forwardable = true
forward = true
encrypt = true
}
[realms]
FUBAR.ORG = {
rlogin = {
forward = false
}
}
SEE ALSO
rsh(1), kerberos(3), krb_sendauth(3), krb_realmofhost(3),
k5login(5), krb5.conf(5), rlogin(1) [UCB version]
FILES
/etc/krb5.conf file containing local host's Kerberos V5
configuration information
7
~/.k5login (on remote host) - file containing Kerberos
principals that are allowed access.
BUGS
More of the environment should be propagated.