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Edit: /usr/sbin/sendmail

#!/bin/bash
##CageFS proxyexec wrapper - ver 16

if [[ $EUID -eq 0 ]]; then
    echo 'Cannot be run as root'
    exit 1
fi

USR=`/usr/bin/whoami`
TOKEN=`/bin/cat /var/.cagefs/.cagefs.token`
# It's user's tmp directory and write to it is secure procedure
# because this script is running only under usual user
PIDFILE="/tmp/.cagefs.proxy.$$"
USER_INTERRUPT=13
CWD=`pwd`

ctrl_c_handler() {
    if [[ -f "$PIDFILE" ]]; then
        pid=`/bin/cat $PIDFILE`
        /bin/rm -f $PIDFILE > /dev/null 2>&1
        /bin/kill -s SIGINT "$pid" > /dev/null 2>&1
    fi
    exit $USER_INTERRUPT
}

if [[ -e /var/.cagefs/origin ]]; then
    ORIGIN=`/bin/cat /var/.cagefs/origin`
    REMOTE="/usr/bin/ssh -F /etc/ssh/cagefs-rexec_config $USR@$ORIGIN"
    $REMOTE CAGEFS_TOKEN="$TOKEN" /usr/sbin/proxyexec -c cagefs.sock "$USR" "$CWD" SENDMAIL $$ "$@"
    RETVAL=$?
else
    trap 'ctrl_c_handler' 2
    CAGEFS_TOKEN="$TOKEN" /usr/sbin/proxyexec -c cagefs.sock "$USR" "$CWD" SENDMAIL $$ "$@"
    RETVAL=$?
    /bin/rm -f $PIDFILE > /dev/null 2>&1
fi

exit $RETVAL

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