New option "-E" supports exclusion of one or multiple checks

Added new option "-E" which will execute all tests except a list of specified checks separated by comma (i.e. check21,check31). Any invalid check name will be discarded. And if just one argument is passed and this is invalid, then Prowler will execute all checks.

To save space, the option will return a list of total checks excluding the list provided. Then, the functionality will overwrite CHECK_ID with the final list and the program will continue as if the user entered "-c" option and the final list of checks.

prowler

@@ -70,6 +70,7 @@ USAGE:
       -l                  list all available checks only (does not perform any check)
       -L                  list all groups (does not perform any check)
       -e                  exclude group extras
+      -E                  execute all tests except a list of specified checks separated by comma (i.e. check21,check31)
       -b                  do not print Prowler banner
       -V                  show version number & exit
       -h                  this help
@@ -77,7 +78,7 @@ USAGE:
   exit
 }
 
-while getopts ":hlLkp:r:c:g:f:m:M:enbV" OPTION; do
+while getopts ":hlLkp:r:c:g:f:m:M:E:enbV" OPTION; do
    case $OPTION in
      h )
         usage
@@ -123,6 +124,9 @@ while getopts ":hlLkp:r:c:g:f:m:M:enbV" OPTION; do
      e )
         EXTRAS=1
         ;;
+     E )
+        EXCLUDE_CHECK_ID=$OPTARG
+        ;;
      V )
         echo "Prowler $PROWLER_VERSION"
         EXITCODE=0
@@ -278,6 +282,40 @@ show_all_group_titles() {
 	done
 }
 
+
+# Function to execute all checks but exclude some of them
+get_all_checks_without_exclusion() {
+        CHECKS_EXCLUDED=()
+        local CHECKS_TO_EXCLUDE=()
+        local TOTAL_CHECKS=()
+        #Get a list of checks to exclude
+        IFS=',' read -ra E_CHECKS <<< "$1"
+        for E_CHECK in "${E_CHECKS[@]}"; do
+            CHECKS_TO_EXCLUDE+=($E_CHECK)
+        done
+        #Get a list of total checks available by ID
+	for i in "${!GROUP_TITLE[@]}"; do
+		#show_group_title $i
+		IFS=',' read -ra CHECKS <<< ${GROUP_CHECKS[$i]}
+		for j in ${CHECKS[@]}; do
+                    TOTAL_CHECKS+=($CHECK_ID_$j)
+		done
+	done
+        TOTAL_CHECKS=($(echo "${TOTAL_CHECKS[*]}" | tr ' ' '\n' | sort -u)) #removes duplicate and store the result as an array
+        #Create a list that contains all checks but excluded ones
+        for i in "${TOTAL_CHECKS[@]}"; do
+            local COINCIDENCE=false
+            for x in "${CHECKS_TO_EXCLUDE[@]}"; do
+                if [[ "$i" == "$x" ]]; then
+                    COINCIDENCE=true
+                fi
+            done
+            if [[ "$COINCIDENCE" = false ]]; then
+                CHECKS_EXCLUDED+=($i)
+            fi
+        done
+}
+
 ### All functions defined above ... run the workflow
 if [[ $MODE != "csv" ]]; then
   prowlerBanner
@@ -303,6 +341,16 @@ fi
 # Gather account data / test aws cli connectivity
 getWhoami
 
+# Get a list of total checks excluding a list provided by the user and overwrite CHECK_ID with the result
+# if the list provided by the user contains an invalid check, this will be discarded.
+# if the list provided by the user contains  just one argument and is invalid, then it will be discarded and all tests will be executed
+if [[ $EXCLUDE_CHECK_ID ]];then
+  get_all_checks_without_exclusion $EXCLUDE_CHECK_ID
+  function join { local IFS="$1"; shift; echo "$*"; }
+  CHECKS_EXCLUDED=$(join , "${CHECKS_EXCLUDED[@]}")
+  CHECK_ID=$CHECKS_EXCLUDED
+fi
+
 # Execute single check if called with -c
 if [[ $CHECK_ID ]];then
   IFS=',' read -ra CHECKS <<< "$CHECK_ID"