epfl-vpn: fix word splitting issue when passing complex command

Signed-off-by: Roosembert Palacios <roosemberth@posteo.ch>

bin/epfl-vpn

@@ -252,12 +252,19 @@ if [ -n "$VPNGATEWAY" ]; then
 
 	"$VPNC_SCRIPT" "$@"
 
+	# Deserialize command
+	OLDIFS="$IFS"
+	IFS="\x1E"
+	# shellcheck disable=SC2206  # splitting with custom IFS
+	CMD=($COMMAND)
+	IFS="$OLDIFS"
+
 	# shellcheck disable=SC2154 # $reason is set by openconnect
 	if [ -n "$NETNS_NAME" ] && [ -n "$RUNAS_USER" ] && [ "$reason" = "connect" ] ; then
 		echo "Running requested command"
 		cat <<- EOF | sudo -u "$RUNAS_USER" bash -s &
 			#!/usr/bin/env bash
-			$COMMAND
+			${CMD[@]}
 			echo
 			echo "Command finished, press Ctrl-C to exit the network jail"
 		EOF
@@ -283,7 +290,8 @@ while [ $# -gt 0 ]; do
 			if [ $# -lt 1 ]; then
 				die $E_USER "A command to execute inside the jail must be specified."
 			fi
-			COMMAND="$@"
+			# Serialize the rest of the arguments, to be executed in bash inside the jail
+			OLDIFS="$IFS"; IFS="\x1E"; COMMAND="$*"; IFS="$OLDIFS"
 			break ;;
 		(-*) die $E_USER 'Unknown option: %s' "$opt" ;;
 		(*) die $E_USER 'Trailing argument: %s' "$opt" ;;