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Improvements and new checks for elasticsearch
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Toni de la Fuente
81
checks/check_extra787
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81
checks/check_extra787
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#!/usr/bin/env bash
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# Prowler - the handy cloud security tool (copyright 2020) by Toni de la Fuente
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may not
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# use this file except in compliance with the License. You may obtain a copy
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# of the License at http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software distributed
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# under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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# CONDITIONS OF ANY KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations under the License.
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CHECK_ID_extra787="7.87"
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CHECK_TITLE_extra787="[extra787] Check connection and authentication for public exposed Elasticsearch/Kibana ports"
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CHECK_SCORED_extra787="NOT_SCORED"
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CHECK_TYPE_extra787="EXTRA"
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CHECK_ALTERNATE_check787="extra787"
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extra787(){
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# Prowler will try to access each ElasticSearch server to port:
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# 9200 API, 9300 Communcation and 5601 Kibana to figure out if authentication is enabled.
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# That is from the host where Prowler is running and will try to read indices or get kibana status
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ES_API_PORT="9200"
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ES_DATA_PORT="9300"
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ES_KIBANA_PORT="5601"
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for regx in $REGIONS; do
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# crate a list of SG open to the world with port $ES_API_PORT or $ES_DATA_PORT or $ES_KIBANA_PORT
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SG_LIST=$($AWSCLI ec2 describe-security-groups $PROFILE_OPT --region $regx --output text \
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--query "SecurityGroups[?length(IpPermissions[?((FromPort==null && ToPort==null) || (FromPort<=\`$ES_API_PORT\` && ToPort>=\`$ES_API_PORT\`) || (FromPort<=\`$ES_DATA_PORT\` && ToPort>=\`$ES_DATA_PORT\`) || (FromPort<=\`$ES_KIBANA_PORT\` && ToPort>=\`$ES_KIBANA_PORT\`)) && (contains(IpRanges[].CidrIp, \`0.0.0.0/0\`) || contains(Ipv6Ranges[].CidrIpv6, \`::/0\`))]) > \`0\`].{GroupId:GroupId}")
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# in case of open security groups goes through each one
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if [[ $SG_LIST ]];then
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for sg in $SG_LIST;do
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# temp file store the list of instances IDs and public IP address if found
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TEMP_EXTRA787_FILE=$(mktemp -t prowler-${ACCOUNT_NUM}-es-domain.EXTRA787.XXXXXXXXXX)
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# finds instances with that open security group attached and get its public ip address (if it has one)
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$AWSCLI $PROFILE_OPT --region $regx ec2 describe-instances --filters Name=instance.group-id,Values=$sg --query 'Reservations[*].Instances[*].[InstanceId,PublicIpAddress]' --output text > $TEMP_EXTRA787_FILE
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# in case of exposed instances it does access checks
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if [[ -s "$TEMP_EXTRA787_FILE" ]];then
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while read instance eip ; do
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if [[ "$eip" != "None" ]];then
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# check for Elasticsearch on port $ES_API_PORT, rest API HTTP.
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CHECH_HTTP_ES_API=$(curl -m 2 -s -w "%{http_code}" -o /dev/null -X GET "http://$eip:$ES_API_PORT/_cat/indices")
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httpStatus $CHECH_HTTP_ES_API
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if [[ $CHECH_HTTP_ES_API -eq "200" ]];then
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textFail "$regx: Found instance $instance with public IP $eip on Security Group: $sg with Elasticsearch port $ES_API_PORT response $SERVER_RESPONSE" "$regx"
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else
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textInfo "$regx: Found instance $instance with public IP $eip on Security Group: $sg with Elasticsearch port $ES_API_PORT response $SERVER_RESPONSE" "$regx"
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fi
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# check for port $ES_DATA_PORT TCP, this is the communication port, not:
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# test_tcp_connectivity is in include/os_detector
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# syntax is 'test_tcp_connectivity $HOST $PORT $TIMEOUT' (in seconds)
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CHECH_HTTP_ES_DATA=$(test_tcp_connectivity $eip $ES_DATA_PORT 2)
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# Using HTTP error codes here as well to reuse httpStatus function
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# codes for better handling, so 200 is open and 000 is not responding
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httpStatus $CHECH_HTTP_ES_DATA
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if [[ $CHECH_HTTP_ES_DATA -eq "200" ]];then
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textFail "$regx: Found instance $instance with public IP $eip on Security Group: $sg with Elasticsearch port $ES_DATA_PORT response $SERVER_RESPONSE" "$regx"
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else
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textInfo "$regx: Found instance $instance with public IP $eip on Security Group: $sg with Elasticsearch port $ES_DATA_PORT response $SERVER_RESPONSE" "$regx"
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fi
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# check for Kibana on port $ES_KIBANA_PORT
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CHECH_HTTP_ES_KIBANA=$(curl -m 2 -s -w "%{http_code}" -o /dev/null -X GET "http://$eip:$ES_KIBANA_PORT/api/status")
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httpStatus $CHECH_HTTP_ES_KIBANA
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if [[ $CHECH_AUTH_5601 -eq "200" ]];then
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textFail "$regx: Found instance $instance with public IP $eip on Security Group: $sg with Kibana on port $ES_KIBANA_PORT response $SERVER_RESPONSE" "$regx"
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else
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textInfo "$regx: Found instance $instance with public IP $eip on Security Group: $sg with Kibana on port $ES_KIBANA_PORT response $SERVER_RESPONSE" "$regx"
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fi
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else
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textInfo "$regx: Found instance $instance with private IP on Security Group: $sg" "$regx"
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fi
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done < <(cat $TEMP_EXTRA787_FILE)
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fi
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rm -rf $TEMP_EXTRA787_FILE
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done
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else
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textPass "$regx: No Security Groups found open to 0.0.0.0/0 for Elasticsearch/Kibana ports" "$regx"
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fi
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done
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}
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