System Administration Commands in.rexecd(1M)
NAME
in.rexecd, rexecd - remote execution server
SYNOPSIS
in.rexecd
DESCRIPTION
in.rexecd is the server for the rexec(3SOCKET) routine. The
server provides remote execution facilities with authentica-
tion based on user names and passwords. It is invoked automatically as needed by inetd(1M), and then executes the following protocol: 1. The server reads characters from the socket up to anull (\0) byte. The resultant string is inter-
preted as an ASCII number, base 10.2. If the number received in step 1 is non-zero, it is
interpreted as the port number of a secondarystream to be used for the stderr. A second connec-
tion is then created to the specified port on the client's machine.3. A null terminated user name of at most 16 charac-
ters is retrieved on the initial socket. 4. A null terminated password of at most 16 characters is retrieved on the initial socket. 5. 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.6. rexecd then validates the user as is done at login
time and, if the authentication was successful,changes to the user's home directory, and estab-
lishes the user and group protections of the user. If any of these steps fail the connection is aborted and a diagnostic message is returned.7. A null byte is returned on the connection associ-
ated with the stderr and the command line is passed to the normal login shell of the user. The shell inherits the network connections established byrexecd.
USAGE
in.rexecd and rexecd are IPv6-enabled. See ip6(7P).
SunOS 5.11 Last change: 4 Nov 2004 1
System Administration Commands in.rexecd(1M)
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:_______________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|________________________________|
| Availability | service/network/network-servers|
|_____________________________|________________________________|
SEE ALSO
svcs(1), inetd(1M), inetadm(1M), svcadm(1M), rexec(3SOCKET), attributes(5), smf(5), ip6(7P) DIAGNOSTICSAll 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 7 above upon successful completion of all the steps prior to the command execution).username too long The name is longer than 16 charac-
ters.password too long The password is longer than 16 char-
acters. command too long The command line passed exceeds thesize of the argument list (as con-
figured into the system). Login incorrect. No password file entry for the user name existed. Password incorrect. The wrong password was supplied.No remote directory. The chdir command to the home direc-
tory failed. Try again. A fork by the server failed.SunOS 5.11 Last change: 4 Nov 2004 2
System Administration Commands in.rexecd(1M)
/usr/bin/sh: ... The user's login shell could not be started. NOTESThe in.rexecd service is managed by the service management
facility, smf(5), under the service identifier: svc:/network/rexec:default Administrative actions on this service, such as enabling, disabling, or requesting restart, can be performed using svcadm(1M). Responsibility for initiating and restarting this service is delegated to inetd(1M). Use inetadm(1M) tomake configuration changes and to view configuration infor-
mation for this service. The service's status can be queried using the svcs(1) command.SunOS 5.11 Last change: 4 Nov 2004 3