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Types: TextFile
Names: »RSHD_DOC«
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RSHD(8C) MAINTENANCE COMMANDS RSHD(8C)
NAME
rshd - remote shell server
SYNOPSIS
/etc/in.rshd host.port
DESCRIPTION
_▶08◀R_▶08◀s_▶08◀h_▶08◀d is the server for the _▶08◀r_▶08◀c_▶08◀m_▶08◀d(3N) routine and, conse-
quently, for the _▶08◀r_▶08◀s_▶08◀h(1C) program. The server provides
remote execution facilities with authentication based on
privileged port numbers.
_▶08◀R_▶08◀s_▶08◀h_▶08◀d is invoked by _▶08◀i_▶08◀n_▶08◀e_▶08◀t_▶08◀d(8C) each time a shell service is
requested, and executes the following protocol:
1) The server checks the client's source port. If the
port is not in the range 0-1023, the server aborts the
connection. The clients host address (in hex) and port
number (in decimal) are the argument passed to _▶08◀r_▶08◀s_▶08◀h_▶08◀d.
2) The server reads characters from the socket up to a
null (`\0') byte. The resultant string is interpreted
as an ASCII number, base 10.
3) If the number received in step 1 is non-zero, it is
interpreted as the port number of a secondary stream to
be used for the stderr. A second connection is then
created to the specified port on the client's machine.
The source port of this second connection is also in
the range 0-1023.
4) The server checks the client's source address. If the
address is associated with a host for which no
corresponding entry exists in the host name data base
(see _▶08◀h_▶08◀o_▶08◀s_▶08◀t_▶08◀s(5)), the server aborts the connection.
5) A null terminated user name of at most 16 characters is
retrieved on the initial socket. This user name is
interpreted as a user identity to use on the server's
machine.
6) A null terminated user name of at most 16 characters is
retrieved on the initial socket. This user name is
interpreted as the user identity on the client's
machine.
7) A null terminated command to be passed to a shell is
retrieved on the initial socket. The length of the
command is limited by the upper bound on the size of
the system's argument list.
8) _▶08◀R_▶08◀s_▶08◀h_▶08◀d then validates the user according to the following
Sun Release 3.5 Last change: 3 January 1984 1
RSHD(8C) MAINTENANCE COMMANDS RSHD(8C)
steps. The remote user name is looked up in the pass-
word file and a _▶08◀c_▶08◀h_▶08◀d_▶08◀i_▶08◀r is performed to the user's home
directory. If the lookup or fails, the connection is
terminated. If the _▶08◀c_▶08◀h_▶08◀d_▶08◀i_▶08◀r fails, it does a _▶08◀c_▶08◀h_▶08◀d_▶08◀i_▶08◀r _▶08◀t_▶08◀o /
(root). If the user is not the super-user, (user id
0), the file /_▶08◀e_▶08◀t_▶08◀c/_▶08◀h_▶08◀o_▶08◀s_▶08◀t_▶08◀s._▶08◀e_▶08◀q_▶08◀u_▶08◀i_▶08◀v is consulted for a list
of hosts considered ``equivalent''. If the client's
host name is present in this file, the authentication
is considered successful. If the lookup fails, or the
user is the super-user, then the file ._▶08◀r_▶08◀h_▶08◀o_▶08◀s_▶08◀t_▶08◀s in the
home directory of the remote user is checked for the
machine name and identity of the user on the client's
machine. If this lookup fails, the connection is ter-
minated.
9) A null byte is returned on the connection associated
with the stderr and the command line is passed to the
normal login shell of the user. The shell inherits the
network connections established by _▶08◀r_▶08◀s_▶08◀h_▶08◀d.
DIAGNOSTICS
All diagnostic messages are returned on the connection asso-
ciated with the stderr, after which any network connections
are closed. An error is indicated by a leading byte with a
value of 1 (0 is returned in step 9 above upon successful
completion of all the steps prior to the command execution).
``locuser too long''
The name of the user on the client's machine is longer than
16 characters.
``remuser too long''
The name of the user on the remote machine is longer than 16
characters.
``command too long ''
The command line passed exceeds the size of the argument
list (as configured into the system).
``Hostname for your address unknown.''
No entry in the host name database existed for the client's
machine.
``Login incorrect.''
No password file entry for the user name existed.
``Permission denied.''
The authentication procedure described above failed.
``Can't make pipe.''
The pipe needed for the stderr, wasn't created.
Sun Release 3.5 Last change: 3 January 1984 2
RSHD(8C) MAINTENANCE COMMANDS RSHD(8C)
``Try again.''
A _▶08◀f_▶08◀o_▶08◀r_▶08◀k by the server failed.
``/bin/sh: ...''
The user's login shell could not be started.
SEE ALSO
rsh(1C), rcmd(3N)
BUGS
The authentication procedure used here assumes the integrity
of each client machine and the connecting medium. This is
insecure, but is useful in an ``open'' environment.
A facility to allow all data exchanges to be encrypted
should be present.
Sun Release 3.5 Last change: 3 January 1984 3