Mail Archives: cygwin/2006/08/30/08:13:55
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Hi All...
>From: Jörg Schaible Reply-To: To: "[ML] CygWin " Subject: RE: ssh-agent
>variables available to any user process
>Date: Wed, 30 Aug 2006 08:02:46 +0200
>
>Lapo Luchini wrote on Wednesday, August 30, 2006 12:42 AM:
>
> > Under FreeBSD, I launch ssh-agent in my .xsession script and its
> > environment is automatically inherited by every shell I then
> > open in my
> > X11 session.
> > No such luck with Windows, but I found a way to propagate a
> > environment variable to any (future) user process after the user is
> > already logged.
> > (or, at the very least...) Works for me.
> >
> > Variables will be then available on any shell and program opened after
> > the attached script is executed.
> > (put it in "Startup" menu in order to execute it at logon time)
>
>I use a similar approach for years utilizing keychain. In my ~/.profile I
>have following lines:
I do domething similar, but skip using keychain because it adds so much time
to launching a bash shell window. I just use ssh-agent directly. Once you do
all this work, keychain isn't doing much for you.
>
>====== %< =======
>if test -z "`pidof ssh-agent`"; then
> keychain ~/.ssh/id_dsa
> . ~/.keychain/`hostname`-sh
> # Create batch files to be called from running shells
> cat ~/.keychain/`hostname`-sh | sed -e "s/;.*$//g" | u2d >
>~/.keychain/`hostname`-command.bat
> # Set environment directly
> regtool -s set /machine/SYSTEM/CurrentControlSet/Control/Session\
>Manager/Environment/SSH_AUTH_SOCK $SSH_AUTH_SOCK
> regtool -s set /machine/SYSTEM/CurrentControlSet/Control/Session\
>Manager/Environment/SSH_AGENT_PID $SSH_AGENT_PID
> # Broadcast of WM_SETTINGCHANGE
> update-env
>else
> . ~/.keychain/`hostname`-sh
>fi
>====== %< =======
>
>And update-env.c is:
>
>====== %< =======
>#include <windows.h>
>int main() {
> SendMessage(HWND_BROADCAST, WM_SETTINGCHANGE, 0,
>(LPARAM)"Environment");
>}
>====== %< =======
>
>build with Makefile:
>
>====== %< =======
>all: update-env.exe
>
>%.exe: %.c
> gcc -mno-cygwin $^ -o $*
> strip $@
>====== %< =======
I use
ssh-add -l >/dev/null 2>&1
if [ $? -eq 1 ]; then
ssh-add
fi
in my profile and I launch ssh-agent from a service(one service for each
user), so it survives logout on windows. The service and service installer
bash scripts are attached.
I've considered supporting this as a package, but have not seen much
interest.
>
>I never found a way to broadcast the WM_SETTINGCHANGE directly form the
>script without the little helper app.
Neither did I. My helper application sendchenv.exe, but the same as
update-env.exe. My source is also attached.
HTH,
...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
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#!/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
# killing the ssh-agent.
regtool -s set /HKEY_CURRENT_USER/Environment/SSH_AUTH_SOCK $SSH_AUTH_SOCK
sendchenv
# Wait quietly until the service is stopped.
while true; do
sleep 24h &
wait
done
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// 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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