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79 lines
3.9 KiB
Bash
79 lines
3.9 KiB
Bash
#!/usr/bin/env bash
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# Prowler - the handy cloud security tool (c) by Toni de la Fuente
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#
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# This Prowler check is licensed under a
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# Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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#
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# You should have received a copy of the license along with this
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# work. If not, see <http://creativecommons.org/licenses/by-nc-sa/4.0/>.
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check3x(){
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grep_filter=$1
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local CHECK_OK
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local CHECK_WARN
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local CHECK_CROSS_ACCOUNT_WARN
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# In order to make all these checks work properly logs and alarms have to
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# be based only on CloudTrail tail with CloudWatchLog configuration.
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DESCRIBE_TRAILS_CACHE=$($AWSCLI cloudtrail describe-trails $PROFILE_OPT --region "$REGION" --query 'trailList[?CloudWatchLogsLogGroupArn != `null`]')
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TRAIL_LIST=$(echo $DESCRIBE_TRAILS_CACHE | jq -r '. |@base64')
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CURRENT_ACCOUNT_ID=$($AWSCLI sts $PROFILE_OPT get-caller-identity --region "$REGION" --query Account --output text)
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CLOUDWATCH_LOGGROUP=$($AWSCLI cloudtrail describe-trails $PROFILE_OPT --region "$REGION" --query 'trailList[*].CloudWatchLogsLogGroupArn' --output text| tr '\011' '\012' | awk -F: '{print $7}')
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if [[ $CLOUDWATCH_LOGGROUP != "" ]]; then
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for group_obj_enc in $TRAIL_LIST; do
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group_obj_raw=$(echo $group_obj_enc | decode_report)
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CLOUDWATCH_LOGGROUP_NAME=$(echo $group_obj_raw | jq -r '.[] | .CloudWatchLogsLogGroupArn|split(":")[6]')
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CLOUDWATCH_LOGGROUP_REGION=$(echo $group_obj_raw | jq -r '.[] | .CloudWatchLogsLogGroupArn|split(":")[3]')
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CLOUDWATCH_LOGGROUP_ACCOUNT=$(echo $group_obj_raw | jq -r '.[] | .CloudWatchLogsLogGroupArn|split(":")[4]')
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if [ "$CLOUDWATCH_LOGGROUP_ACCOUNT" == "$CURRENT_ACCOUNT_ID" ];then
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# Filter control and whitespace from .metricFilters[*].filterPattern for easier matching later
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METRICFILTER_CACHE=$($AWSCLI logs describe-metric-filters --log-group-name "$CLOUDWATCH_LOGGROUP_NAME" $PROFILE_OPT --region "$CLOUDWATCH_LOGGROUP_REGION"|jq '.metricFilters|=map(.filterPattern|=gsub("[[:space:]]+"; " "))')
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METRICFILTER_SET=$(echo $METRICFILTER_CACHE | jq -r --arg re "$grep_filter" '.metricFilters[]|select(.filterPattern|test($re))|.filterName')
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fi
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if [[ $METRICFILTER_SET ]];then
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for metric in $METRICFILTER_SET; do
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metric_name=$(echo $METRICFILTER_CACHE | jq -r --arg name $metric '.metricFilters[]|select(.filterName==$name)|.metricTransformations[0].metricName')
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HAS_ALARM_ASSOCIATED=$($AWSCLI cloudwatch describe-alarms $PROFILE_OPT --region "$CLOUDWATCH_LOGGROUP_REGION" --query 'MetricAlarms[?MetricName==`'"$metric_name"'`]' --output text)
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if [[ $HAS_ALARM_ASSOCIATED ]];then
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CHECK_OK="$CHECK_OK $CLOUDWATCH_LOGGROUP_NAME:$metric"
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else
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CHECK_WARN="$CHECK_WARN $CLOUDWATCH_LOGGROUP_NAME:$metric"
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fi
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done
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elif [ "$CLOUDWATCH_LOGGROUP_ACCOUNT" == "$CURRENT_ACCOUNT_ID" ];then
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CHECK_WARN="$CHECK_WARN $CLOUDWATCH_LOGGROUP_NAME"
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else
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CHECK_CROSS_ACCOUNT_WARN="$CHECK_CROSS_ACCOUNT_WARN $CLOUDWATCH_LOGGROUP_NAME"
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fi
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done
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if [[ $CHECK_OK ]]; then
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for group in $CHECK_OK; do
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metric=${group#*:}
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group=${group%:*}
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textPass "CloudWatch group $group found with metric filter $metric and alarms set"
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done
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fi
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if [[ $CHECK_WARN ]]; then
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for group in $CHECK_WARN; do
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case $group in
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*:*) metric=${group#*:}
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group=${group%:*}
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textFail "CloudWatch group $group found with metric filter $metric but no alarms associated"
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;;
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*) textFail "CloudWatch group $group found but no metric filters or alarms associated"
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esac
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done
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fi
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if [[ $CHECK_CROSS_ACCOUNT_WARN ]]; then
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for group in $CHECK_CROSS_ACCOUNT_WARN; do
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textInfo "CloudWatch group $group is not in this account"
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done
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fi
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else
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textFail "No CloudWatch group found for CloudTrail events"
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fi
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}
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