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win-gpg-agent-relay
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win-gpg-agent-relay
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#!/bin/bash
# Script origins:
# https://gist.github.com/andsens/2ebd7b46c9712ac205267136dc677ac1
# https://gist.github.com/Nimamoh/e2df2ba0a99ef221d8cca360c931e5e6
# For debugging startup problems uncomment next line
# exec 2> >(tee -a -i "$HOME/error.log")
GNUPGHOME="$HOME/.gnupg"
if [ ! -d ${GNUPGHOME} ]; then
mkdir ${GNUPGHOME}
chmod 0700 ${GNUPGHOME}
fi
PIDFILE="$GNUPGHOME/win-gpg-agent-relay.pid"
SORELAY_BIN="${HOME}/winhome/.wsl/sorelay.exe"
WINAGENT_HOME_DIR="${WIN_AGENT_HOME}"
WINGPGAGENT_SOCKETS_DIR="${WIN_GNUPG_SOCKETS}"
GPG_AGENT_SOCK="$WINGPGAGENT_SOCKETS_DIR/S.gpg-agent"
GPG_AGENT_EXTRA_SOCK="$WINGPGAGENT_SOCKETS_DIR/S.gpg-agent.extra"
GPG_AGENT_SSH_SOCK="$WINAGENT_HOME_DIR/S.gpg-agent.ssh"
log() {
echo >&2 "$@"
}
is_pid_running() {
if [[ -z "$1" ]]; then
return 1
fi
ps -p "$1" >/dev/null
return $?
}
_cleanup() {
log "Cleaning up relay to $GPG_AGENT_SOCK..."
if is_pid_running "$SOCAT_GPG_AGENT_PID"; then
kill -SIGTERM "$SOCAT_GPG_AGENT_PID" || log "Failed."
fi
log "Cleaning up relay to $GPG_AGENT_EXTRA_SOCK..."
if is_pid_running "$SOCAT_GPG_AGENT_EXTRA_PID"; then
kill -SIGTERM "$SOCAT_GPG_AGENT_EXTRA_PID" || log "Failed."
fi
log "Cleaning up relay to $GPG_AGENT_SSH_SOCK..."
if is_pid_running "$SOCAT_GPG_AGENT_SSH_PID"; then
kill -SIGTERM "$SOCAT_GPG_AGENT_SSH_PID" || log "Failed."
fi
}
die() {
if [[ -n "$1" ]]; then
log "$1"
fi
log "Exiting."
exit 1
}
usage() {
log "Usage: win-gpg-agent-relay [OPTIONS] COMMAND"
log ""
log " SUMMARY: Relay local GPG sockets to win-gpg-agent's ones in order to integrate WSL2 and host."
log " Do debug use foreground command"
log ""
log " OPTIONS:"
log " -h|--help this page"
log ""
log " -v|--verbose verbose mode"
log ""
log " COMMAND: start, stop, foreground"
}
fg_opts() {
FG_OPTS=()
# Generate opts for passing it to foreground version
if [[ -n "$VERBOSE" ]]; then
FG_OPTS+=("-v")
fi
}
main() {
POSITIONAL=()
VERBOSE=""
while (($# > 0)); do
case "$1" in
-v | --verbose)
VERBOSE="ENABLED"
shift # shift once since flags have no values
;;
-h | --help)
usage
exit 0
;;
*) # unknown flag/switch
POSITIONAL+=("$1")
shift
if [[ "${#POSITIONAL[@]}" -gt 1 ]]; then
usage
die
fi
;;
esac
done
set -- "${POSITIONAL[@]}" # restore positional params
if [[ -z "$VERBOSE" ]]; then
QUIET="QUIET"
fi
case "${POSITIONAL[0]}" in
start)
fg_opts
start-stop-daemon --start --oknodo --pidfile "$PIDFILE" --name win-gpg-agent-r --make-pidfile --background --startas "$0" ${VERBOSE:+--verbose} ${QUIET:+--quiet} -- foreground "${FG_OPTS[@]}"
;;
stop)
start-stop-daemon --pidfile "$PIDFILE" --stop --remove-pidfile ${VERBOSE:+--verbose} ${QUIET:+--quiet}
;;
status)
start-stop-daemon --pidfile "$PIDFILE" --status ${VERBOSE:+--verbose} ${QUIET:+--quiet}
local result=$?
case $result in
0) log "$0 is running" ;;
1 | 3) log "$0 is not running" ;;
4) log "$0 unable to determine status" ;;
esac
return $result
;;
foreground)
relay
;;
*)
usage
die
;;
esac
}
relay() {
trap _cleanup EXIT
log "Using gpg-agent sockets in: $WINGPGAGENT_SOCKETS_DIR"
log "Using agent-gui sockets in: $WINAGENT_HOME_DIR"
[[ -f "${SORELAY_BIN}" ]] || die "Unable to access ${SORELAY_BIN}"
[[ -z "$WINGPGAGENT_SOCKETS_DIR" ]] && die "Wrong directory of gpg-agent sockets"
[[ -z "$WINAGENT_HOME_DIR" ]] && die "Wrong directory of agent-gui home"
if pgrep -fx "^gpg-agent\s.+" >/dev/null; then
log "Killing previously started local gpg-agent..."
echo "KILLAGENT" | gpg-connect-agent >/dev/null 2>&1
fi
if [ -e "$HOME/.gnupg/S.gpg-agent" ] || [ -e "$HOME/.gnupg/S.gpg-agent.extra" ] || [ -e "$HOME/.gnupg/S.gpg-agent.ssh" ]; then
log "WSL has been shutdown ungracefully, leaving garbage behind"
rm "$HOME/.gnupg/S.gpg-agent" "$HOME/.gnupg/S.gpg-agent.extra" "$HOME/.gnupg/S.gpg-agent.ssh"
fi
socat UNIX-LISTEN:"\"$HOME/.gnupg/S.gpg-agent\"",fork EXEC:"\"\'$SORELAY_BIN\' -a \'$GPG_AGENT_SOCK\'\"",nofork 1>/dev/null 2>&1 &
SOCAT_GPG_AGENT_PID="$!"
if ! is_pid_running "$SOCAT_GPG_AGENT_PID"; then
log "socat $SOCAT_GPG_AGENT_PID failed"
return 1
fi
log "socat running with PID: $SOCAT_GPG_AGENT_PID"
socat UNIX-LISTEN:"\"$HOME/.gnupg/S.gpg-agent.extra\"",fork EXEC:"\"\'$SORELAY_BIN\' -a \'$GPG_AGENT_EXTRA_SOCK\'\"",nofork 1>/dev/null 2>&1 &
SOCAT_GPG_AGENT_EXTRA_PID="$!"
if ! is_pid_running "$SOCAT_GPG_AGENT_EXTRA_PID"; then
log "socat $SOCAT_GPG_AGENT_EXTRA_PID failed"
return 1
fi
log "socat running with PID: $SOCAT_GPG_AGENT_EXTRA_PID"
socat UNIX-LISTEN:"\"$HOME/.gnupg/S.gpg-agent.ssh\"",fork EXEC:"\"\'$SORELAY_BIN\' \'$GPG_AGENT_SSH_SOCK\'\"",nofork 1>/dev/null 2>&1 &
SOCAT_GPG_AGENT_SSH_PID="$!"
if ! is_pid_running "$SOCAT_GPG_AGENT_SSH_PID"; then
log "socat $SOCAT_GPG_AGENT_SSH_PID failed"
return 1
fi
log "socat running with PID: $SOCAT_GPG_AGENT_SSH_PID"
log -n "Polling remote ssh-agent..."
res=`SSH_AUTH_SOCK="$HOME/.gnupg/S.gpg-agent.ssh" ssh-add -L 2>&1`
if [ "$?" -ne 0 ]; then
# When hardware smartcard is used to keep private keys gpg will report no identities here
if ! echo "${res}" | grep -q "The agent has no identities"; then
die "Failure communicating with ssh-agent"
fi
fi
log "OK"
log -n "Polling remote gpg-agent... "
gpg-connect-agent /bye >/dev/null 2>&1 || die "[$?] Failure communicating with gpg-agent"
log "OK"
# Everything checks, we are ready for actions
log "Entering wait..."
wait $SOCAT_GPG_AGENT_PID $SOCAT_GPG_AGENT_EXTRA_PID $SOCAT_GPG_AGENT_SSH_PID
}
main "$@"