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109 lines
7.4 KiB
Bash
109 lines
7.4 KiB
Bash
#!/usr/bin/env bash
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# Prowler - the handy cloud security tool (copyright 2018) 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_extra716="7.16"
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CHECK_TITLE_extra716="[extra716] Check if Amazon Elasticsearch Service (ES) domains are set as Public and have cross account access "
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CHECK_SCORED_extra716="NOT_SCORED"
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CHECK_TYPE_extra716="EXTRA"
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CHECK_ALTERNATE_check716="extra716"
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extra716(){
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# if TEST_AUTHENTICATION has a value Prowler will try to access each ElasticSearch server to the public URI endpoint.
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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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TEST_ES_AUTHENTICATION=
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httpStatus(){
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case $1 in
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000) SERVER_RESPONSE="000 Not responding" ;;
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200) SERVER_RESPONSE="200 Successful" ;;
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400) SERVER_RESPONSE="400 Error: Bad Request" ;;
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401) SERVER_RESPONSE="401 Error: Unauthorized" ;;
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403) SERVER_RESPONSE="403 Error: Forbidden" ;;
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404) SERVER_RESPONSE="404 Error: Not Found" ;;
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407) SERVER_RESPONSE="407 Error: Proxy Authentication Required" ;;
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408) SERVER_RESPONSE="408 Error: Request Timeout" ;;
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500) SERVER_RESPONSE="500 Error: Internal Server Error" ;;
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502) SERVER_RESPONSE="502 Error: Bad Gateway" ;;
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503) SERVER_RESPONSE="503 Error: Service Unavailable" ;;
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504) SERVER_RESPONSE="504 Error: Gateway Timeout" ;;
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505) SERVER_RESPONSE="505 Error: HTTP Version Not Supported" ;;
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*) SERVER_RESPONSE="HTTP: status not defined." ;;
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esac
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}
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# "Check if Elasticsearch Service domains allow open access (Not Scored) (Not part of CIS benchmark)"
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for regx in $REGIONS; do
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LIST_OF_DOMAINS=$($AWSCLI es list-domain-names $PROFILE_OPT --region $regx --query DomainNames --output text)
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if [[ $LIST_OF_DOMAINS ]]; then
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for domain in $LIST_OF_DOMAINS;do
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TEMP_POLICY_FILE=$(mktemp -t prowler-${ACCOUNT_NUM}-es-domain.policy.XXXXXXXXXX)
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# get endpoint or vpc endpoints
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ES_DOMAIN_ENDPOINT=$($AWSCLI es describe-elasticsearch-domain --domain-name $domain $PROFILE_OPT --region $regx --query 'DomainStatus.[Endpoint || Endpoints]' --output text)
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# If the endpoint starts with "vpc-" it is in a VPC then it is fine.
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if [[ "$ES_DOMAIN_ENDPOINT" =~ ^vpc-* ]];then
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ES_DOMAIN_VPC=$($AWSCLI es describe-elasticsearch-domain --domain-name $domain $PROFILE_OPT --region $regx --query 'DomainStatus.VPCOptions.VPCId' --output text)
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textInfo "$regx: Amazon ES domain $domain is in VPC $ES_DOMAIN_VPC run extra779 to make sure it is not exposed using custom proxy" "$regx"
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else
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$AWSCLI es describe-elasticsearch-domain-config --domain-name $domain $PROFILE_OPT --region $regx --query DomainConfig.AccessPolicies.Options --output text > $TEMP_POLICY_FILE 2> /dev/null
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CHECK_ES_DOMAIN_POLICY_OPEN=$(cat $TEMP_POLICY_FILE | jq -r '. | .Statement[] | select(.Effect == "Allow" and (((.Principal|type == "object") and .Principal.AWS == "*") or ((.Principal|type == "string") and .Principal == "*")) and select(has("Condition") | not))')
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CHECK_ES_DOMAIN_POLICY_HAS_CONDITION=$(cat $TEMP_POLICY_FILE | jq -r '. | .Statement[] | select(.Effect == "Allow" and (((.Principal|type == "object") and .Principal.AWS == "*") or ((.Principal|type == "string") and .Principal == "*")) and select(has("Condition")))' )
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CHECK_ES_DOMAIN_POLICY_CONDITION_PRIVATE_IP=$(cat $TEMP_POLICY_FILE | jq 'select (.Statement[0] .Condition.IpAddress."aws:SourceIp" | select( test("^192.168.[0-9]|^10.0.[0-9]|^172.(1[6-9]|2[0-9]|3[01])|^127.0.0.1")))' )
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CHECK_ES_DOMAIN_POLICY_CONDITION_ZERO=$(cat $TEMP_POLICY_FILE | jq 'select (.Statement[0] .Condition.IpAddress."aws:SourceIp" | select( test("^0.0.0.0/0|^0.0.0.0/8")))' )
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CHECK_ES_DOMAIN_POLICY_CONDITION_STAR=$(cat $TEMP_POLICY_FILE | jq 'select (.Statement[0] .Condition.IpAddress."aws:SourceIp" == "*")')
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CHECK_ES_DOMAIN_POLICY_CONDITION_PUBLIC_IP=$(cat $TEMP_POLICY_FILE | jq 'select (.Statement[0] .Condition.IpAddress."aws:SourceIp" | select( test("^192.168.[0-9]|^10.0.[0-9]|^172.(1[6-9]|2[0-9]|3[01])|^127.0.0.1")| not))' )
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if [[ $CHECK_ES_DOMAIN_POLICY_OPEN || $CHECK_ES_DOMAIN_POLICY_CONDITION_ZERO || $CHECK_ES_DOMAIN_POLICY_CONDITION_STAR ]];then
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if [[ $TEST_ES_AUTHENTICATION ]];then
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# check for REST API on port 443
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CHECH_ES_HTTPS=$(curl -m 2 -s -w "%{http_code}" -o /dev/null -X GET "https://$ES_DOMAIN_ENDPOINT/_cat/indices")
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httpStatus $CHECH_ES_HTTPS
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if [[ $CHECH_ES_HTTPS -eq "200" ]];then
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textFail "$regx: Amazon ES domain $domain policy allows Anonymous access and ES service endpoint $ES_DOMAIN_ENDPOINT responded $SERVER_RESPONSE" "$regx"
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else
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textInfo "$regx: Amazon ES domain $domain policy allows Anonymous access but ES service endpoint $ES_DOMAIN_ENDPOINT responded $SERVER_RESPONSE" "$regx"
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fi
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# check for Kibana on port 443
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CHECH_KIBANA_HTTPS=$(curl -m 2 -s -w "%{http_code}" -o /dev/null -X GET "https://$ES_DOMAIN_ENDPOINT/_plugin/kibana/api/status")
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httpStatus $CHECH_KIBANA_HTTPS
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if [[ $CHECH_KIBANA_HTTPS -eq "200" ]];then
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textFail "$regx: Amazon ES domain $domain policy allows Anonymous access and Kibana service endpoint $ES_DOMAIN_ENDPOINT responded $SERVER_RESPONSE" "$regx"
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else
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textInfo "$regx: Amazon ES domain $domain policy allows Anonymous access but Kibana service endpoint $ES_DOMAIN_ENDPOINT responded $SERVER_RESPONSE" "$regx"
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fi
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else
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if [[ $CHECK_ES_DOMAIN_POLICY_OPEN ]];then
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textFail "$regx: Amazon ES domain $domain policy allows access (Principal: \"*\") AUTH NOT TESTED" "$regx"
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fi
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if [[ $CHECK_ES_DOMAIN_POLICY_CONDITION_ZERO ]];then
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textFail "$regx: Amazon ES domain $domain policy allows access (Principal: \"*\" and network 0.0.0.0) AUTH NOT TESTED" "$regx"
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fi
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if [[ $CHECK_ES_DOMAIN_POLICY_CONDITION_STAR ]];then
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textFail "$regx: Amazon ES domain $domain policy allows access (Principal: \"*\" and network \"*\") AUTH NOT TESTED" "$regx"
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fi
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fi
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elif [[ $CHECK_ES_DOMAIN_POLICY_HAS_CONDITION ]];then
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if [[ $CHECK_ES_DOMAIN_POLICY_CONDITION_PRIVATE_IP ]];then
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textInfo "$regx: Amazon ES domain $domain policy allows access from a RFC1918 PRIVATE IP or CIDR" "$regx"
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fi
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if [[ $CHECK_ES_DOMAIN_POLICY_CONDITION_PUBLIC_IP ]];then
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textInfo "$regx: Amazon ES domain $domain policy allows access from a PUBLIC IP or CIDR" "$regx"
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fi
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else
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textPass "$regx: Amazon ES domain $domain does not allow Anonymous cross account access" "$regx"
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fi
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fi
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rm -f $TEMP_POLICY_FILE
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done
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else
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textInfo "$regx: No Amazon ES domain found" "$regx"
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fi
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done
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}
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