in.rexecd(1M) System Administration Commands in.rexecd(1M)NAME
in.rexecd, rexecd - remote execution server
SYNOPSISin.rexecdDESCRIPTIONin.rexecd is the server for the rexec(3SOCKET) routine. The server
provides remote execution facilities with authentication 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 a null
(\0) byte. The resultant string is interpreted as an ASCII
number, base 10.
2. If the number received in step 1 is non-zero, it is inter‐
preted 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.
3. A null terminated user name of at most 16 characters 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 establishes the user and group protec‐
tions 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 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 rexecd.
USAGEin.rexecd and rexecd are IPv6-enabled. See ip6(7P).
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬────────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼────────────────────────────────┤
│Availability │service/network/network-servers │
└─────────────────────────────┴────────────────────────────────┘
SEE ALSOsvcs(1), inetd(1M), inetadm(1M), svcadm(1M), rexec(3SOCKET),
attributes(5), smf(5), ip6(7P)DIAGNOSTICS
All diagnostic messages are returned on the connection associated 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 characters.
password too long The password is longer than 16 characters.
command too long The command line passed exceeds the size of the
argument list (as configured 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 directory failed.
Try again. A fork by the server failed.
/usr/bin/sh: ... The user's login shell could not be started.
NOTES
The 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) to make configuration changes and to view configuration
information for this service. The service's status can be queried using
the svcs(1) command.
SunOS 5.11 4 Nov 2004 in.rexecd(1M)
