Charles Wilson wrote:
> Karl M wrote:
>> Just a comment...keychain is pretty heavy for what you get in Cygwin. I had
>> problems a long time ago with a slow laptop running XP SP2 with Cygwin
>> windows taking a long time to open if I kicked off several at once,
>> particularly at boot time.
>>
>> My solution was to launch ssh-agent as a service (one for each user that
>> wants it). That service spawns the agent and updates the user environment in
>> the registry so that other processes can find the ssh-agent process/socket.
>> The advantages are that it is fast and the agent survives a logout (only
>> rekey for a reboot is desired).
>>
>> I had thought about offering it as a package, but there was insufficient
>> interest. Your are welcome to it if you are interested. It has been rock
>> solid for years.
>
> That sounds like a useful alternative.
>
It is three bash script files and one C program (just compile it with gcc). The
shell scripts (1) install the service, (2) are the service under cygrunsrv and
(3) is the commands to add to your bash_profile. If you use a different shell,
they will need syntax tweaking. The C program provides access to sending a
Windows API call to broadcast a message for WM_SETTINGCHANGE. This is needed
because the user can log in before the service is started in XP. I think that
this all worked on WIN2k when last I tried it, but it has been a long time
since I touched a WIN2k box. I have no experience with Vista :.).
Overall, it is fast and simple.
Enjoy,
...Karl
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#!/bin/bash
# secret-agent-service-install service-name user-name
if [ "~$1" = "~" ]; then
echo A service name is required.
exit 1
fi
if [ "~$2" = "~" ]; then
echo A user name is required.
exit 1
fi
echo Uninstalling the secret-agent service, $1.
cygrunsrv --remove $1
echo Adding the \"Log on as a Service\" right for $2.
editrights -a SeServiceLogonRight -u "$2"
echo Installing the secret-agent service, $1.
cygrunsrv --install $1 \
--args '/bin/secret-agent-service' \
--disp "Secret Agent $2" \
--desc "Creates an ssh-agent process for $2." \
--path '/bin/bash' \
--shutdown \
--user "$2"
echo Starting the secret-agent service, $1.
cygrunsrv --start $1
#!/bin/bash
# Launch the ssh-agent from a service so it survives logoff.
# When the service stops, kill the ssh-agent.
trap "ssh-agent -k;
exit 0" TERM
# Clean up old files that may be left behind after a crash.
# The file permissions make this safe to do in a multi-user
# environment, but "/tmp" must be local to this host.
rm -rf /tmp/ssh-*
# Launch the ssh-agent.
eval $(ssh-agent)
# Provide the ssh-agent socket ID via the registry and broadcast
# the change in case the user is logged before we finish.
# Do not provide the ssh-agent PID to minimize the risk of
# accidentally killing the ssh-agent.
regtool -s set /HKEY_CURRENT_USER/Environment/SSH_AUTH_SOCK $SSH_AUTH_SOCK
regtool remove /HKEY_CURRENT_USER/Environment/SSH_AGENT_PID
sendchenv
# Wait quietly until the service is stopped.
while true; do
sleep 24h &
wait
done
ssh-add -l >/dev/null 2>&1
if [ $? -eq 1 ]; then
ssh-add
fi
// Notify all windows that environment variables may have changed.
#include <windows.h>
int main()
{
DWORD dwReturnValue;
if (SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0,
(LPARAM) "Environment", SMTO_ABORTIFHUNG, 5000, &dwReturnValue))
return 0;
else
return 1;
}
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