maandag 9 december 2013

quick script to check for unsupported device nodes by SELinux

 #!/bin/bash --  
 #  
 # This script checks for device nodes that are unsupported by SELinux  
 # Unsupported device nodes fall back to the device_t generic type identifier for content in /dev   
 # The script just finds all chars and blocks, then looks if any of them as associated with the device_t type identifier  
 # If any device node is associated with device_t sid then the script uses matchpathcon to determine if SELinux is aware of the device node  
 # If matchpathcon thinks the device node should be associated with the device_t type then the device node is unsupported by SELinux one way or another  
 #  
 IFS=$'\n'  
 recurse_char() {  
  for i in "$1"/*;do  
   if [ -d "$i" ];then  
     recurse_char "$i"  
   elif [ -c "$i" -a ! -L "$i" ]; then  
     echo "$(ls -alZ "$i")"  
   fi  
  done  
 }  
 recurse_block() {  
  for i in "$1"/*;do  
   if [ -d "$i" ];then  
     recurse_block "$i"  
   elif [ -b "$i" -a ! -L "$i" ]; then  
     echo "$(ls -alZ "$i")"  
   fi  
  done  
 }  
 for s in $(recurse_char /dev); do  
      if [ "$(echo $s | /usr/bin/awk -F " " '{ print $4 }' | /usr/bin/awk -F ":" '{ print $3 }')" == "device_t" ] ; then  
           IFS=" "  
           read -r bits owner group context char <<< "$s"  
           mpc=$(/usr/sbin/matchpathcon "$char")  
           if [ "$(echo $mpc | /usr/bin/awk -F " " '{ print $2 }' | /usr/bin/awk -F ":" '{ print $3 }')" == "device_t" ] ; then  
                echo "unsupported char device: $char"  
           fi  
      fi  
 done  
 for s in $(recurse_block /dev); do  
      if [ "$(echo $s | /usr/bin/awk -F " " '{ print $4 }' | /usr/bin/awk -F ":" '{ print $3 }')" == "device_t" ] ; then  
           IFS=" "  
           read -r bits owner group context block <<< "$s"  
           mpc=$(/usr/sbin/matchpathcon "$block")  
           if [ "$(echo $mpc | /usr/bin/awk -F " " '{ print $2 }' | /usr/bin/awk -F ":" '{ print $3 }')" == "device_t" ] ; then  
                echo "unsupported block device: $block"  
           fi  
      fi  
 done  
 exit 0;  
 #EOF  

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