challenge: Handle root password

pkg/challenge/init

@@ -20,8 +20,21 @@ cmdline() {
 USER_LOGIN=$(cmdline adlin.login)
 USER_PKEY=$(cmdline adlin.key)
 USER_IP=$(cmdline adlin.ip)
+ROOT_PASSWORD=$(cmdline adlin.rootpasswd)
+
+[ -f /etc/shadow_ ] && mv /etc/shadow_ /etc/shadow
 
 [ -n "${USER_IP}" ] && echo "${USER_IP}" > /root/my_ip
+[ -n "${ROOT_PASSWORD}" ] && sed -i "/^root:/s@!@${ROOT_PASSWORD}@" /etc/shadow
+
+# Handle extra user from /etc/shadow
+sed -r 's/^([^:]+):.*$/\1/' /etc/shadow | while read u; do
+    grep -q "^$u" /etc/passwd || {
+        i=$(($(wc -l /etc/passwd | cut -d ' ' -f 1) + 988))
+        echo "$u:x:$i:$u" >> /etc/group
+        echo "$u:x:$i:$i:new user:/home:/bin/ash" >> /etc/passwd
+    }
+done
 
 # Define hostname
 hostname adlin-${USER_LOGIN}
@@ -45,6 +58,7 @@ done
 
 # Launch some daemons
 #/usr/bin/setsid /usr/sbin/crond > /dev/null &
+/usr/bin/setsid /bin/shadow-up > /dev/null 2> /dev/null &
 
 # Prepare bonus 2
 mkdir -p /mnt
@@ -68,7 +82,7 @@ N2=$((25 + $RANDOM % 35))
 sync
 rm /mnt/bonus2
 sync
-umount /mnt
+umount /mnt 2> /dev/null
 
 
 # Launch requested init