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#!/usr/bin/env bash
# Copyright 2018 Toni de la Fuente
# Prowler is a tool that provides automate auditing and hardening guidance of an
# AWS account. It is based on AWS-CLI commands. It follows some guidelines
# present in the CIS Amazon Web Services Foundations Benchmark at:
# https://d0.awsstatic.com/whitepapers/compliance/AWS_CIS_Foundations_Benchmark.pdf
# Contact the author at https://blyx.com/contact
# and open issues or ask questions at https://github.com/toniblyx/prowler
# All CIS based checks in checks folder are licensed under a Creative Commons
# Attribution-NonCommercial-ShareAlike 4.0 International Public License.
# The link to the license terms can be found at
# https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode
#
# Any other piece of code is licensed as Apache License 2.0 as specified in
# each file. You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Prowler - Iron Maiden
#
# Walking through the city, looking oh so pretty
# I've just got to find my way
# See the ladies flashing
# All there legs and lashes
# I've just got to find my way...
OPTRED="[1;31m"
OPTNORMAL="[0;39m"
# Set the defaults variables
PROWLER_VERSION=2.3.0-18122020
PROWLER_DIR=$(dirname "$0")
REGION=""
FILTERREGION=""
MAXITEMS=100
MONOCHROME=0
MODE="text"
QUIET=0
SEP=','
KEEPCREDREPORT=0
EXITCODE=0
SEND_TO_SECURITY_HUB=0
SCRIPT_START_TIME=$( date -u +"%Y-%m-%dT%H:%M:%S%z" )
TITLE_ID=""
TITLE_TEXT="CALLER ERROR - UNSET TITLE"
WHITELIST_FILE=""
TOTAL_CHECKS=()
# Command usage menu
usage(){
echo "
USAGE:
`basename $0` [ -p <profile> -r <region> -h ]
Options:
-p <profile> specify your AWS profile to use (i.e.: default)
-r <region> specify an AWS region to direct API requests to
(i.e.: us-east-1), all regions are checked anyway if the check requires it
-c <check_id> specify one or multiple check ids separated by commas, to see all available checks use "-l" option
(i.e.: "check11" for check 1.1 or "extra71,extra72" for extra check 71 and extra check 72)
-g <group_id> specify a group of checks by id, to see all available group of checks use "-L"
(i.e.: "group3" for entire section 3, "cislevel1" for CIS Level 1 Profile Definitions or "forensics-ready")
-f <filterregion> specify an AWS region to run checks against
(i.e.: us-west-1)
-m <maxitems> specify the maximum number of items to return for long-running requests (default: 100)
-M <mode> output mode: text (default), mono, html, json, json-asff, junit-xml, csv. They can be used combined comma separated.
(separator is ","; data is on stdout; progress on stderr).
-k keep the credential report
-n show check numbers to sort easier
(i.e.: 1.01 instead of 1.1)
-l list all available checks only (does not perform any check). Add -g <group_id> to only list checks within the specified group
-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
-s show scoring report
-S send check output to AWS Security Hub - only valid when the output mode is json-asff (i.e. "-M json-asff -S")
-x specify external directory with custom checks (i.e. /my/own/checks, files must start by "check")
-q suppress info messages and passing test output
-A account id for the account where to assume a role, requires -R and -T
(i.e.: 123456789012)
-R role name to assume in the account, requires -A and -T
(i.e.: ProwlerRole)
-T session duration given to that role credentials in seconds, default 1h (3600) recommended 12h, requires -R and -T
(i.e.: 43200)
-I External ID to be used when assuming roles (not mandatory), requires -A and -R
-w whitelist file. See whitelist_sample.txt for reference and format
(i.e.: whitelist_sample.txt)
-N <shodan_api_key> Shoadan API key used by check extra7102.
-V show version number & exit
-h this help
"
exit
}
while getopts ":hlLkqp:r:c:g:f:m:M:E:x:enbVsSI:A:R:T:w:N:" OPTION; do
case $OPTION in
h )
usage
EXITCODE=1
exit $EXITCODE
;;
l )
PRINTCHECKSONLY=1
;;
L )
PRINTGROUPSONLY=1
;;
k )
KEEPCREDREPORT=1
;;
p )
PROFILE=$OPTARG
;;
r )
REGION_OPT=$OPTARG
;;
c )
CHECK_ID=$OPTARG
;;
g )
GROUP_ID_READ=$OPTARG
;;
f )
FILTERREGION=$OPTARG
;;
m )
MAXITEMS=$OPTARG
;;
M )
MODE=$OPTARG
;;
n )
NUMERAL=1
;;
b )
BANNER=0
;;
e )
EXTRAS=1
;;
E )
EXCLUDE_CHECK_ID=$OPTARG
;;
V )
echo "Prowler $PROWLER_VERSION"
EXITCODE=0
exit $EXITCODE
;;
s )
SCORING=1
;;
S )
SEND_TO_SECURITY_HUB=1
;;
x )
EXTERNAL_CHECKS_PATH=$OPTARG
;;
q )
QUIET=1
;;
A )
ACCOUNT_TO_ASSUME=$OPTARG
;;
R )
ROLE_TO_ASSUME=$OPTARG
;;
I )
ROLE_EXTERNAL_ID=$OPTARG
;;
T )
SESSION_DURATION_TO_ASSUME=$OPTARG
;;
w )
WHITELIST_FILE=$OPTARG
;;
N )
SHODAN_API_KEY=$OPTARG
;;
: )
echo ""
echo "$OPTRED ERROR!$OPTNORMAL -$OPTARG requires an argument"
usage
EXITCODE=1
exit $EXITCODE
;;
? )
echo ""
echo "$OPTRED ERROR!$OPTNORMAL Invalid option"
usage
EXITCODE=1
exit $EXITCODE
;;
esac
done
clean_up() {
rm -f /tmp/prowler*.policy.*
# in case html output is used, make sure it closes html file properly
if [[ "${MODES[@]}" =~ "html" ]]; then
addHtmlFooter >> ${OUTPUT_FILE_NAME}.$EXTENSION_HTML
fi
}
handle_ctrl_c() {
clean_up
exit $EXITCODE
}
# Clean up any temp files when prowler quits unexpectedly
trap clean_up EXIT
# Clean up and exit if Ctrl-C occurs. Required to allow Ctrl-C to stop Prowler when running in Docker
trap handle_ctrl_c INT
# Environment variable takes precedence over command line
unset AWS_DEFAULT_OUTPUT
. $PROWLER_DIR/include/colors
. $PROWLER_DIR/include/os_detector
. $PROWLER_DIR/include/aws_profile_loader
. $PROWLER_DIR/include/awscli_detector
. $PROWLER_DIR/include/whoami
. $PROWLER_DIR/include/assume_role
. $PROWLER_DIR/include/csv_header
. $PROWLER_DIR/include/banner
. $PROWLER_DIR/include/html_report
. $PROWLER_DIR/include/outputs
. $PROWLER_DIR/include/credentials_report
. $PROWLER_DIR/include/scoring
. $PROWLER_DIR/include/python_detector
. $PROWLER_DIR/include/secrets_detector
. $PROWLER_DIR/include/check_creds_last_used
. $PROWLER_DIR/include/check3x
. $PROWLER_DIR/include/connection_tests
. $PROWLER_DIR/include/securityhub_integration
. $PROWLER_DIR/include/junit_integration
# Get list of regions based on include/whoami
REGIONS=$($AWSCLI ec2 describe-regions --query 'Regions[].RegionName' --output text $PROFILE_OPT --region $REGION_FOR_STS --region-names $FILTERREGION 2>&1)
if [[ $(echo "$REGIONS" | grep AccessDenied) ]]; then
echo "Access Denied trying to describe regions"
EXITCODE=1
exit $EXITCODE
fi
# Pre-process whitelist file if supplied
if [[ -n "$WHITELIST_FILE" ]]; then
# ignore lines starting with # (comments)
# ignore inline comments: check1:foo # inline comment
WHITELIST="$(awk '!/^[[:space:]]*#/{print }' <(cat "$WHITELIST_FILE") | sed 's/[[:space:]]*#.*$//g')"
fi
# Load all of the groups of checks inside groups folder named as "groupNumber*"
for group in $(ls $PROWLER_DIR/groups/group[0-9]*|grep -v groupN_sample); do
. "$group"
done
# Load all of the checks inside checks folder named as "check*"
# this includes also extra checks since they are "check_extraNN"
for checks in $(ls $PROWLER_DIR/checks/check*|grep -v check_sample); do
. "$checks"
done
# include checks if external folder is specified
if [[ $EXTERNAL_CHECKS_PATH ]]; then
for checks in $(ls $EXTERNAL_CHECKS_PATH/check*); do
. "$checks"
done
fi
# Get a list of total checks available by ID
for i in "${!GROUP_TITLE[@]}"; do
IFS=',' read -ra CHECKS <<< "${GROUP_CHECKS[$i]}"
for j in "${CHECKS[@]}"; do
TOTAL_CHECKS+=("$CHECK_ID_$j")
done
done
# Remove duplicates, sort checks numerically, and store the result as an array
# Note: the sort mechanism relies on the fact that the check ID prefixes 'check' and 'extra' are both 5 characters long.
# 6th character is the section number, 7th character onwards is the individual ID (e.g. check110 = check 1 10)
TOTAL_CHECKS=($(echo "${TOTAL_CHECKS[*]}" | tr ' ' '\n' | awk '!seen[$0]++' | sort -k 1.6,1.6n -k 1.7n))
# Function to show the title of the check, and optionally which group(s) it belongs to
# using this way instead of arrays to keep bash3 (osx) and bash4(linux) compatibility
show_check_title() {
local check_id=CHECK_ID_$1
local check_title=CHECK_TITLE_$1
local check_scored=CHECK_SCORED_$1
local check_type=CHECK_TYPE_$1
local check_asff_compliance_type=CHECK_ASFF_COMPLIANCE_TYPE_$1
local group_ids
local group_index
# If requested ($2 is any non-null value) iterate all GROUP_CHECKS and produce a comma-separated list of all
# the GROUP_IDs that include this particular check
if [[ -n "$2" ]]; then
for group_index in "${!GROUP_ID[@]}"; do
if [[ "${GROUP_CHECKS[$group_index]}" =~ "$1" ]]; then
if [[ -n "$group_ids" ]]; then
group_ids+=", "
fi
group_ids+="${GROUP_ID[$group_index]}"
fi
done
fi
# This shows ASFF_COMPLIANCE_TYPE if group used is ens, this si used to show ENS compliance ID control, can be used for other compliance groups as well.
if [[ ${GROUP_ID_READ} == "ens" ]];then
textTitle "${!check_id}" "${!check_title}" "${!check_scored}" "${!check_type}" "$group_ids" "(${!check_asff_compliance_type})"
else
textTitle "${!check_id}" "${!check_title}" "${!check_scored}" "${!check_type}" "$group_ids"
fi
}
# Function to show the title of a group, by numeric id
show_group_title() {
# when csv mode is used, no group title is shown
if [[ "$MODE" != "csv" ]]; then
textTitle "${GROUP_NUMBER[$1]}" "${GROUP_TITLE[$1]}" "NOT_SCORED" "SUPPORT"
fi
}
# Function to execute the check
execute_check() {
if [[ $ACCOUNT_TO_ASSUME ]]; then
MINIMUM_REMAINING_TIME_ALLOWED=$(($SESSION_DURATION_TO_ASSUME / 10 ))
CURRENT_TIMESTAMP=$(date -u "+%s")
SESSION_CUTOFF=$(($CURRENT_TIMESTAMP + $MINIMUM_REMAINING_TIME_ALLOWED))
if [[ $AWS_SESSION_EXPIRATION < $SESSION_CUTOFF ]]; then
unset AWS_ACCESS_KEY_ID
unset AWS_SECRET_ACCESS_KEY
unset AWS_SESSION_TOKEN
assume_role
fi
fi
# See if this is an alternate name for a check
# for example, we might have been passed 1.01 which is another name for 1.1
local alternate_name_var=CHECK_ALTERNATE_$1
local alternate_name=${!alternate_name_var}
# See if this check defines an ASFF Type, if so, use this, falling back to a sane default
# For a list of Types, see: https://docs.aws.amazon.com/securityhub/latest/userguide/securityhub-findings-format.html#securityhub-findings-format-type-taxonomy
local asff_type_var=CHECK_ASFF_TYPE_$1
local asff_compliance_type_var=CHECK_ASFF_COMPLIANCE_TYPE_$1
local severity_var=CHECK_SEVERITY_$1
CHECK_SEVERITY="${!severity_var}"
CHECK_ID="$1"
ASFF_TYPE="${!asff_type_var:-Software and Configuration Checks}"
ASFF_COMPLIANCE_TYPE="${!asff_compliance_type_var:-Software and Configuration Checks}"
# See if this check defines an ASFF Resource Type, if so, use this, falling back to a sane default
# For a list of Resource Types, see: https://docs.aws.amazon.com/securityhub/latest/userguide/securityhub-findings-format.html#asff-resources
local asff_resource_type_var=CHECK_ASFF_RESOURCE_TYPE_$1
ASFF_RESOURCE_TYPE="${!asff_resource_type_var:-AwsAccount}"
SECURITYHUB_NEW_FINDINGS_IDS=()
# Generate the credential report, only if it is group1 related which checks we
# run so that the checks can safely assume it's available
# set the custom ignores list for this check
ignores="$(awk "/${1}/{print}" <(echo "${WHITELIST}"))"
if [ ${alternate_name} ];then
if [[ ${alternate_name} == check1* || ${alternate_name} == extra71 || ${alternate_name} == extra774 || ${alternate_name} == extra7123 ]];then
if [ ! -s $TEMP_REPORT_FILE ];then
genCredReport
saveReport
fi
fi
show_check_title ${alternate_name}
if is_junit_output_enabled; then
prepare_junit_check_output "$1"
fi
# Execute the check
IGNORES="${ignores}" CHECK_NAME="$1" ${alternate_name}
if is_junit_output_enabled; then
finalise_junit_check_output "$1"
fi
if [[ "$SEND_TO_SECURITY_HUB" -eq 1 ]]; then
resolveSecurityHubPreviousFails "$1"
fi
else
# Check to see if this is a real check
local check_id_var=CHECK_ID_$1
local check_id=${!check_id_var}
if [ ${check_id} ]; then
if [[ ${check_id} == 1* || ${check_id} == 7.1 || ${check_id} == 7.74 || ${check_id} == 7.123 ]];then
if [ ! -s $TEMP_REPORT_FILE ];then
genCredReport
saveReport
fi
fi
show_check_title "$1"
if is_junit_output_enabled; then
prepare_junit_check_output "$1"
fi
# Execute the check
IGNORES="${ignores}" CHECK_NAME="$1" $1
if is_junit_output_enabled; then
finalise_junit_check_output "$1"
fi
if [[ "$SEND_TO_SECURITY_HUB" -eq 1 ]]; then
resolveSecurityHubPreviousFails "$1"
fi
else
textFail "ERROR! Use a valid check name (i.e. check41 or extra71)";
exit $EXITCODE
fi
fi
}
# Function to execute all checks in a group
execute_group() {
show_group_title $1
# run the checks in the group
IFS=',' read -ra CHECKS <<< ${GROUP_CHECKS[$1]}
# Exclude any checks specified
if [[ -n ${2} ]]; then
EXCLUDED_CHECKS=()
NEW_CHECKS=()
IFS=',' read -ra EXCLUDED_CHECKS <<< "${2},"
for exc in ${EXCLUDED_CHECKS[@]} ; do
for i in ${!CHECKS[@]} ; do
[[ ${CHECKS[i]} = ${exc} ]] && unset CHECKS[i]
done
done
unset EXCLUDED_CHECKS
fi
for i in ${CHECKS[@]}; do
execute_check ${i}
done
}
# Function to execute group by name
execute_group_by_id() {
for i in "${!GROUP_ID[@]}"; do
if [ "${GROUP_ID[$i]}" == "$1" ]; then
execute_group ${i} $2
fi
done
}
# Function to execute all checks in all groups except extras if -e is invoked
execute_all() {
for i in "${!GROUP_TITLE[@]}"; do
if [[ $EXTRAS ]]; then
GROUP_RUN_BY_DEFAULT[7]='N'
fi
if [ "${GROUP_RUN_BY_DEFAULT[$i]}" == "Y" ]; then
execute_group $i
fi
done
}
# Function to show the titles of either all checks or only those in the specified group
show_all_titles() {
local checks
local check_id
local group_index
# If '-g <group_id>' has been specified, only show the titles of checks within the specified group
if [[ $GROUP_ID_READ ]];then
if [[ " ${GROUP_ID[@]} " =~ " ${GROUP_ID_READ} " ]]; then
for group_index in "${!GROUP_ID[@]}"; do
if [ "${GROUP_ID[$group_index]}" == "${GROUP_ID_READ}" ]; then
show_group_title "$group_index"
IFS=',' read -ra checks <<< "${GROUP_CHECKS[$group_index]}"
for check_id in ${checks[@]}; do
show_check_title "$check_id"
done
fi
done
else
textFail "Use a valid check group ID i.e.: group1, extras, forensics-ready, etc."
show_all_group_titles
exit $EXITCODE
fi
else
for check_id in "${TOTAL_CHECKS[@]}"; do
# Pass 1 so that the group IDs that this check belongs to are printed
show_check_title "$check_id" 1
done
fi
}
show_all_group_titles() {
local group_index
for group_index in "${!GROUP_TITLE[@]}"; do
show_group_title "$group_index"
done
}
# Function to execute all checks but exclude some of them
get_all_checks_without_exclusion() {
CHECKS_EXCLUDED=()
local CHECKS_TO_EXCLUDE=()
# Get a list of checks to exclude
IFS=',' read -ra E_CHECKS <<< "$1"
for E_CHECK in "${E_CHECKS[@]}"; do
CHECKS_TO_EXCLUDE+=($E_CHECK)
done
# Create a list that contains all checks but excluded ones
for i in "${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 [[ " ${MODES[@]} " =~ " mono " || " ${MODES[@]} " =~ " text " ]]; then
prowlerBanner
fi
# List only check tittles
if [[ $PRINTCHECKSONLY == "1" ]]; then
show_all_titles
exit $EXITCODE
fi
# List only group tittles
if [[ $PRINTGROUPSONLY == "1" ]]; then
show_all_group_titles
exit $EXITCODE
fi
# Check that jq is installed for JSON outputs
if [[ " ${MODES[@]} " =~ " json " || " ${MODES[@]} " =~ " json-asff " ]]; then
. $PROWLER_DIR/include/jq_detector
fi
if [[ "$SEND_TO_SECURITY_HUB" -eq 1 ]]; then
checkSecurityHubCompatibility
fi
if is_junit_output_enabled; then
prepare_junit_output
fi
# Gather account data / test aws cli connectivity
getWhoami
if [[ $ACCOUNT_TO_ASSUME ]]; then
assume_role
fi
# Execute group of checks if called with -g
if [[ $GROUP_ID_READ ]];then
if [[ " ${GROUP_ID[@]} " =~ " ${GROUP_ID_READ} " ]]; then
execute_group_by_id ${GROUP_ID_READ} ${EXCLUDE_CHECK_ID}
if [[ "${MODES[@]}" =~ "html" ]]; then
addHtmlFooter >> ${OUTPUT_FILE_NAME}.$EXTENSION_HTML
fi
cleanTemp
scoring
exit $EXITCODE
else
textFail "Use a valid check group ID i.e.: group1, extras, forensics-ready, etc."
show_all_group_titles
exit $EXITCODE
fi
fi
# 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"
for CHECK in "${CHECKS[@]}"; do
execute_check $CHECK
done
if [[ "${MODES[@]}" =~ "html" ]]; then
addHtmlFooter >> ${OUTPUT_FILE_NAME}.$EXTENSION_HTML
fi
cleanTemp
exit $EXITCODE
fi
execute_all
if [[ "${MODES[@]}" =~ "html" ]]; then
addHtmlFooter >> ${OUTPUT_FILE_NAME}.$EXTENSION_HTML
fi
scoring
cleanTemp
if [[ $ACCOUNT_TO_ASSUME ]]; then
# unset env variables with assumed role credentials
unset AWS_ACCESS_KEY_ID
unset AWS_SECRET_ACCESS_KEY
unset AWS_SESSION_TOKEN
fi
exit $EXITCODE