#!/bin/bash

# findsuid--Checks all SUID files or programs to see if they're writeable,
#   and outputs the matches in a friendly and useful format.

mtime="7"       # How far back (in days) to check for modified cmds
verbose=0       # By default, let's be quiet about things.

if [ "$1" = "-v" ] ; then
  verbose=1          # User-specified findsuid –v, so let's be verbose.
fi

# "find –perm" looks at the permissions of the file: 4000 and above 
#   are setuid/setgid.

find / -type f -perm +4000 -print0 | while read -d '' -r match
do
  if [ -x "$match" ] ; then

    # Let's split out file owner and permissions from the "ls –ld" output.

    owner="$(ls -ld $match | awk '{print $3}')"
    perms="$(ls -ld $match | cut -c5-10 | grep 'w')" 

    if [ ! -z $perms ] ; then
      echo "**** $match (writeable and setuid $owner)"
    elif [ ! -z $(find $match -mtime -$mtime -print) ] ; then
      echo "**** $match (modified within $mtime days and setuid $owner)"
    elif [ $verbose -eq 1 ] ; then
      # By default, only dangerous scripts are listed. If verbose, show all.
      lastmod="$(ls -ld $match | awk '{print $6, $7, $8}')"
      echo "     $match (setuid $owner, last modified $lastmod)"
    fi
  fi
done

exit 0