heimdal-rshd man page
rshd — remote shell server
|rshd|| [-aiklnvxPL] [-p |
rshd is the server for the rsh(1) program. It provides an authenticated remote command execution service. Supported options are:
- -n, --no-keepalive
- Disables keep-alive messages. Keep-alives are packets sent at certain intervals to make sure that the client is still there, even when it doesn't send any data.
- -k, --kerberos
- Assume that clients connecting to this server will use some form of Kerberos authentication. See the Examples section for a sample inetd.conf(5) configuration.
- -x, --encrypt
- For Kerberos 4 this means that the connections are encrypted. Kerberos 5 can negotiate encryption even without this option, but if it's present rshd will deny unencrypted connections. This option implies -k.
- -v, --vacuous
- If the connecting client does not use any Kerberised authentication, print a message that complains about this fact, and exit. This is helpful if you want to move away from old port-based authentication.
- When using the AFS filesystem, users' authentication tokens are put in something called a PAG (Process Authentication Group). Multiple processes can share a PAG, but normally each login session has its own PAG. This option disables the setpag() call, so all tokens will be put in the default (uid-based) PAG, making it possible to share tokens between sessions. This is only useful in peculiar environments, such as some batch systems.
- -i, --no-inetd
- The -i option will cause rshd to create a socket, instead of assuming that its stdin came from inetd(8). This is mostly useful for debugging.
- Port to use with -i.
- This flag is for backwards compatibility only.
- This flag enables logging of connections to syslogd(8). This option is always on in this implementation.
The following can be used to enable Kerberised rsh in inetd.cond(5), while disabling non-Kerberised connections:
shell stream tcp nowait root /usr/libexec/rshd rshd -v kshell stream tcp nowait root /usr/libexec/rshd rshd -k ekshell stream tcp nowait root /usr/libexec/rshd rshd -kx
The rshd command appeared in 4.2BSD.
This implementation of rshd was written as part of the Heimdal Kerberos 5 implementation.