On Wed, 16 Jul 2003 [EMAIL PROTECTED] wrote:
> I know about /etc/X11/Xsession.options and use-ssh-agent, but most of
> the people that will be reading this are using Solaris, HP-UX and all
> kinds of GNU/Linux distributions, so this must be as portable as
> possible. Of course the above is for OpenSSH, but the same examples are
> given further in the text adapted for use with SSH.com.
Hi,
After reading a lot of stuff on the net I have written some code I think
should work for Bourne Shell and C Shell derivatives. Following are the
examples for OpenSSH. The examples for SSH.com only differ where names
of environment variables and commands are used. I'd appreciate it if you
could comment on them. Undoubtedly they can be improved upon.
As I am not well-versed in [t]csh scripting and because I could not find
any information on defining functions I simply haven't done that. Is it
possible to define functions in the C Shell?
Another thing is the $USER environment variable. On the systems I have
at my disposal (GNU/Linux and Solaris) it is set by login as expected,
but I am not sure if that is the case for other platforms (HP-UX and the
BSDs mainly) too.
Finally there is the output of "ps ux". I use it to verify the PID of
the ssh-agent process. For that I take the value found in the second
column, but I am not sure if "ps ux" will give me that on all/most
unices. Does anyone on the list know?
Thanks for you help.
Grx HdV
P.S. I looked at keychain and I really liked it, but choose not to
introduce a new tool in our environment. That would make getting this
accepted in our organization on short term all that much harder.
Here's the code for inclusion in ~/.profile:
--------------------------------------------
#!/bin/bash
AGENT_INFO=~/.ssh/agent.info
CURRENT_AGENT_PID=$(ps ux | grep "^$USER" | grep 'ssh-agent' | grep -v 'grep' | head
-1 | awk '{print $2}')
TTY=/usr/bin/tty
VERBOSE=1
function init_agent {
ssh-agent > $AGENT_INFO
chmod 0600 $AGENT_INFO
. $AGENT_INFO
}
#Set up an SSH Agent session if this is a terminal-session
if $TTY > /dev/null; then
if [ "$SSH_AGENT_PID" = "" ]; then
if [ ! -f $AGENT_INFO ]; then
if [ "$VERBOSE" = "1" ]; then
echo "Initializing SSH Agent..."
fi
init_agent
else
if [ "$VERBOSE" = "1" ]; then
echo "Sourcing Agent state from $AGENT_INFO ..."
fi
. $AGENT_INFO
if [ "$CURRENT_AGENT_PID" != "$SSH_AGENT_PID" ]; then
if [ "$VERBOSE" = "1" ]; then
echo "PID found in $AGENT_INFO differs from current PID, starting new
Agent..."
fi
init_agent
fi
fi
elif [ "$CURRENT_AGENT_PID" != "$SSH_AGENT_PID" ]; then
if [ "$VERBOSE" = "1" ]; then
echo "Value of SSH_AGENT_PID differs from current PID, starting new Agent..."
fi
init_agent
fi
#Remove cruft from previous sessions
if [ "$VERBOSE" = "1" ]; then
echo "Removing all keys from the Agent's memory..."
fi
ssh-add -D
#Load default key
if [ "$VERBOSE" = "1" ]; then
echo "Loading default key for $USER..."
fi
ssh-add < /dev/null
fi
Here's the code for inclusion in ~/.login:
------------------------------------------
#!/bin/csh
set AGENT_INFO=~/.ssh/agent.info
set CURRENT_AGENT_PID=`ps ux | grep "^$USER" | grep 'ssh-agent' | grep -v 'grep' |
head -1 | awk '{print $2}'`
set TTY=/usr/bin/tty
set VERBOSE=1
#Set up an SSH Agent session if this is a terminal-session
if {( $TTY > /dev/null )} then
if ( "$SSH_AGENT_PID" == "" ) then
if ( ! -f $AGENT_INFO ) then
if ( "$VERBOSE" == "1" ) echo "Initializing SSH Agent..."
ssh-agent > $AGENT_INFO
chmod 0600 $AGENT_INFO
source $AGENT_INFO
else
if ( "$VERBOSE" == "1" ) echo "Sourcing Agent state from $AGENT_INFO ..."
source $AGENT_INFO
if ( "$CURRENT_AGENT_PID" != "$SSH_AGENT_PID" ) then
if ( "$VERBOSE" == "1" ) echo "PID found in $AGENT_INFO differs from current
PID, starting new Agent..."
ssh-agent > $AGENT_INFO
chmod 0600 $AGENT_INFO
source $AGENT_INFO
endif
endif
else if ( "$CURRENT_AGENT_PID" != "$SSH_AGENT_PID" ) then
if ( "$VERBOSE" == "1" ) echo "Value of SSH_AGENT_PID differs from current PID,
starting new Agent..."
ssh-agent > $AGENT_INFO
chmod 0600 $AGENT_INFO
source $AGENT_INFO
endif
#Remove cruft from previous sessions
if ( "$VERBOSE" == "1" ) echo "Removing all keys from the Agent's memory..."
ssh-add -D
#Load default key
if ( "$VERBOSE" == "1" ) echo "Loading default key for $USER..."
ssh-add < /dev/null
endif
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