xref: /freebsd/crypto/heimdal/appl/rsh/rshd.8 (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
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32.\" $Id: rshd.8,v 1.7 2003/04/16 19:58:42 lha Exp $
33.\"
34.Dd November 22, 2002
35.Dt RSHD 8
36.Os HEIMDAL
37.Sh NAME
38.Nm rshd
39.Nd
40remote shell server
41.Sh SYNOPSIS
42.Nm
43.Op Fl aiklnvxPL
44.Op Fl p Ar port
45.Sh DESCRIPTION
46.Nm
47is the server for
48the
49.Xr rsh 1
50program. It provides an authenticated remote command execution
51service.  Supported options are:
52.Bl -tag -width Ds
53.It Xo
54.Fl n ,
55.Fl -no-keepalive
56.Xc
57Disables keep-alive messages.
58Keep-alives are packets sent at certain intervals to make sure that the
59client is still there, even when it doesn't send any data.
60.It Xo
61.Fl k ,
62.Fl -kerberos
63.Xc
64Assume that clients connecting to this server will use some form of
65Kerberos authentication. See the
66.Sx EXAMPLES
67section for a sample
68.Xr inetd.conf 5
69configuration.
70.It Xo
71.Fl x ,
72.Fl -encrypt
73.Xc
74For Kerberos 4 this means that the connections are encrypted. Kerberos
755 can negotiate encryption even without this option, but if it's
76present
77.Nm
78will deny unencrypted connections. This option implies
79.Fl k .
80.\".It Xo
81.\".Fl l ,
82.\".Fl -no-rhosts
83.\".Xc
84.\"When using old port-based authentication, the user's
85.\".Pa .rhosts
86.\"files are normally checked. This options disables this.
87.It Xo
88.Fl v ,
89.Fl -vacuous
90.Xc
91If the connecting client does not use any Kerberised authentication,
92print a message that complains about this fact, and exit. This is
93helpful if you want to move away from old port-based authentication.
94.It Xo
95.Fl P
96.Xc
97When using the AFS filesystem, users' authentication tokens are put in
98something called a PAG (Process Authentication Group). Multiple
99processes can share a PAG, but normally each login session has its own
100PAG. This option disables the
101.Fn setpag
102call, so all tokens will be put in the default (uid-based) PAG, making
103it possible to share tokens between sessions. This is only useful in
104peculiar environments, such as some batch systems.
105.It Xo
106.Fl i ,
107.Fl -no-inetd
108.Xc
109The
110.Fl i
111option will cause
112.Nm
113to create a socket, instead of assuming that its stdin came from
114.Xr inetd 8 .
115This is mostly useful for debugging.
116.It Xo
117.Fl p Ar port ,
118.Fl -port= Ns Ar port
119.Xc
120Port to use with
121.Fl i .
122.It Xo
123.Fl a
124.Xc
125This flag is for backwards compatibility only.
126.It Xo
127.Fl L
128.Xc
129This flag enables logging of connections to
130.Xr syslogd 8 .
131This option is always on in this implementation.
132.El
133.\".Sh ENVIRONMENT
134.Sh FILES
135.Bl -tag -width /etc/hosts.equiv -compact
136.It Pa /etc/hosts.equiv
137.It Pa ~/.rhosts
138.El
139.Sh EXAMPLES
140The following can be used to enable Kerberised rsh in
141.Xr inetd.cond 5 ,
142while disabling non-Kerberised connections:
143.Bd -literal
144shell   stream  tcp  nowait  root  /usr/libexec/rshd  rshd -v
145kshell  stream  tcp  nowait  root  /usr/libexec/rshd  rshd -k
146ekshell stream  tcp  nowait  root  /usr/libexec/rshd  rshd -kx
147.Ed
148.\".Sh DIAGNOSTICS
149.Sh SEE ALSO
150.Xr rsh 1 ,
151.Xr iruserok 3
152.\".Sh STANDARDS
153.Sh HISTORY
154The
155.Nm
156command appeared in
157.Bx 4.2 .
158.Sh AUTHORS
159This implementation of
160.Nm
161was written as part of the Heimdal Kerberos 5 implementation.
162.\".Sh BUGS
163