There is no difference in login process for both version's sshd manual:
LOGIN PROCESS
When a user successfully logs in, sshd does the following:
1. If the login is on a tty, and no command has been
specified,
prints last login time and /etc/motd (unless prevented
in
the configuration file or by ~/.hushlogin; see the FILES
section).
2. If the login is on a tty, records login time.
3. Checks /etc/nologin; if it exists, prints contents and
quits
(unless root).
4. Changes to run with normal user privileges.
5. Sets up basic environment.
6. Reads the file ~/.ssh/environment, if it exists, and
users
are allowed to change their environment. See the
PermitUserEnvironment option in sshd_config(5).
7. Changes to user's home directory.
8. If ~/.ssh/rc exists, runs it; else if /etc/ssh/sshrc
exists,
runs it; otherwise runs xauth. The ``rc'' files are
given
the X11 authentication protocol and cookie in standard
input.
See SSHRC, below.
9. Runs user's shell or command.
The fact is if I do a "real" login (ssh without command), server2 has
the variable be set:
Localhost$ ssh server2 echo $LIC_HOST
Localhost$ ssh server2
$ hostname
server2
$ cat $HOME/.kshrc
LIC_HOST=licserv; export LIC_HOST;
$ echo $LIC_HOST
licserv
When running "ssh ssh_server command", I guess the difference between
the two versions is at step 9, where server1 runs the command with
user's shell but server2 runs the command with a "default shell".
I am not sure how the latest Openssh dose on this point. If the user can
not specify different environment/shell variables for different server
when doing "ssh ssh_server command", that is a restriction for remote
application submission.
Jialing
-----Original Message-----
From: Greg Wooledge [mailto:wooledg@xxxxxxxxxxx]
Sent: Thursday, March 05, 2009 11:54 AM
To: Jialing Liang
Cc: secureshell@xxxxxxxxxxxxxxxxx
Subject: Re: Activity of the $HOME/.kshrc
On Thu, Mar 05, 2009 at 11:43:39AM -0700, Jialing Liang wrote:
> > I have ssh login to two Linux - Openssh server. They share one $Home
> > directory. server1 runs Redhat 3 with Openssh 3.6.1 and sever2 runs
> > Redhat 5 with Openssh 4.3
> >Check the user's shell and make sure it's actually ksh.
> It is ksh:
> Localhost$ ssh server1 echo $SHELL
> /usr/bin/ksh
> Localhost$ ssh server2 echo $SHELL
> /usr/bin/ksh
In that case, look for the manuals for OpenSSH 3.6.1 and 4.3 and make
sure the features you're relying on (~/.ssh/environment) are actually
available in both versions. Also, check the server configs to make
sure PermitUserEnvironment is set to yes (the default is ``no'').
