initial commit

chapter26/chk_passwd_gid_0.bash

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+#!/bin/bash
+#
+# SCRIPT: chk_passwd_gid_0.bash
+#
+# PURPOSE: This script searches the /etc/passwd
+# for all non-root users who are a member of
+# the system/root group, GID=0
+#
+###########################################
+# DECLARE FILES AND VARIABLES HERE
+###########################################
+
+case $(uname) in
+SunOS) alias awk=nawk
+       ;;
+esac
+
+###########################################
+# BEGINNING OF MAIN
+###########################################
+
+awk -F ':' '{print $1, $3}' /etc/passwd | while read U G
+do
+    # If the user is root skip the test
+    if [ $U != 'root' ]
+    then
+        # Test for GID=0
+        if $(id $U | grep -q 'gid=0' )
+        then
+            echo "WARNING: $U is a member of the root/system group"
+        fi
+    fi
+done