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https://github.com/ghndrx/prowler.git
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168 lines
11 KiB
Bash
168 lines
11 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_extra73="7.3,7.03"
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CHECK_TITLE_extra73="[extra73] Ensure there are no S3 buckets open to the Everyone or Any AWS user (Not Scored) (Not part of CIS benchmark)"
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CHECK_SCORED_extra73="NOT_SCORED"
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CHECK_TYPE_extra73="EXTRA"
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CHECK_ALTERNATE_extra703="extra73"
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CHECK_ALTERNATE_check73="extra73"
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CHECK_ALTERNATE_check703="extra73"
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# Improved and simplified check on Nov 18th 2018 due to a new bucket attribute
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# called PolicyStatus, not available in all regions yet.
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# extra73(){
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# ALL_BUCKETS_LIST=$($AWSCLI s3api list-buckets --query 'Buckets[*].{Name:Name}' $PROFILE_OPT --region $REGION --output text)
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# for bucket in $ALL_BUCKETS_LIST; do
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# BUCKET_LOCATION=$($AWSCLI s3api get-bucket-location --bucket $bucket $PROFILE_OPT --region $REGION --output text)
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# if [[ "None" == $BUCKET_LOCATION ]]; then
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# BUCKET_LOCATION="us-east-1"
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# fi
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# if [[ "EU" == $BUCKET_LOCATION ]]; then
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# BUCKET_LOCATION="eu-west-1"
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# fi
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#
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# BUCKET_POLICY_STATUS=$($AWSCLI s3api get-bucket-policy-status --bucket $bucket --query PolicyStatus.IsPublic --output text | grep False)
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# if [[ $BUCKET_POLICY_STATUS ]];then
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# textFail "$BUCKET_LOCATION: $bucket bucket is Public!" "$BUCKET_LOCATION"
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# else
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# textPass "$BUCKET_LOCATION: $bucket bucket is not Public" "$BUCKET_LOCATION"
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# fi
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# done
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# }
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extra73(){
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textInfo "Looking for open S3 Buckets (ACLs and Policies) in all regions... "
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ALL_BUCKETS_LIST=$($AWSCLI s3api list-buckets --query 'Buckets[*].{Name:Name}' $PROFILE_OPT --output text)
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for bucket in $ALL_BUCKETS_LIST; do
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# 3 DIFFERENT POSSIBLE, Let's show only 1 finding all together
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S3_FINDING_ALLUSERS_ACL="Ok"
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S3_FINDING_AUTHUSERS_ACL="Ok"
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S3_FINDING_POLICY="Ok"
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# LOCATION
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BUCKET_LOCATION=$($AWSCLI s3api get-bucket-location --bucket $bucket $PROFILE_OPT --output text)
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if [[ "None" == $BUCKET_LOCATION ]]; then
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BUCKET_LOCATION="us-east-1"
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fi
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if [[ "EU" == $BUCKET_LOCATION ]]; then
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BUCKET_LOCATION="eu-west-1"
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fi
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# EXPLICIT DENY
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CHEK_FOR_EXPLICIT_DENY=$($AWSCLI s3api get-bucket-acl $PROFILE_OPT --region $BUCKET_LOCATION --bucket $bucket --output text 2>&1)
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if [[ $(echo "$CHEK_FOR_EXPLICIT_DENY" | grep AccessDenied) ]] ; then
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textInfo "$BUCKET_LOCATION: $bucket have an explicit Deny. Not possible to get ACL." "$bucket" "$BUCKET_LOCATION"
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else
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# PUBLIC BLOCK
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# https://docs.aws.amazon.com/cli/latest/reference/s3api/get-public-access-block.html
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BUCKET_PUBLIC_BLOCK_IGNOREPUBLICACL=$($AWSCLI s3api get-public-access-block --bucket $bucket $PROFILE_OPT --region $BUCKET_LOCATION --output text --query PublicAccessBlockConfiguration.IgnorePublicAcls 2>/dev/null)
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BUCKET_PUBLIC_BLOCK_BLOCKPUBLICPOLICY=$($AWSCLI s3api get-public-access-block --bucket $bucket $PROFILE_OPT --region $BUCKET_LOCATION --output text --query PublicAccessBlockConfiguration.BlockPublicPolicy 2>/dev/null)
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BUCKET_PUBLIC_BLOCK_BLOCKPUBLICACLS=$($AWSCLI s3api get-public-access-block --bucket $bucket $PROFILE_OPT --region $BUCKET_LOCATION --output text --query PublicAccessBlockConfiguration.BlockPublicAcls 2>/dev/null)
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BUCKET_PUBLIC_BLOCK_RESTRICPUBLICBUCKET=$($AWSCLI s3api get-public-access-block --bucket $bucket $PROFILE_OPT --region $BUCKET_LOCATION --output text --query PublicAccessBlockConfiguration.RestrictPublicBuckets 2>/dev/null)
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if [[ $BUCKET_PUBLIC_BLOCK_IGNOREPUBLICACL == "True" ]] && [[ $BUCKET_PUBLIC_BLOCK_BLOCKPUBLICPOLICY == "True" ]] && [[ $BUCKET_PUBLIC_BLOCK_BLOCKPUBLICACLS == "True" ]] && [[ $BUCKET_PUBLIC_BLOCK_RESTRICPUBLICBUCKET == "True" ]]; then
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textPass "$BUCKET_LOCATION: $bucket bucket is public blocked (public-access-block)" "$BUCKET_LOCATION"
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else
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## ACL
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# check if AllUsers is in the ACL as Grantee
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CHECK_BUCKET_ALLUSERS_ACL=$($AWSCLI s3api get-bucket-acl $PROFILE_OPT --region $BUCKET_LOCATION --bucket $bucket --query "Grants[?Grantee.URI == 'http://acs.amazonaws.com/groups/global/AllUsers']" --output text |grep -v GRANTEE)
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CHECK_BUCKET_ALLUSERS_ACL_SINGLE_LINE=$(echo -ne $CHECK_BUCKET_ALLUSERS_ACL)
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# check if AuthenticatedUsers is in the ACL as Grantee, they will have access with sigened URL only
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CHECK_BUCKET_AUTHUSERS_ACL=$($AWSCLI s3api get-bucket-acl $PROFILE_OPT --region $BUCKET_LOCATION --bucket $bucket --query "Grants[?Grantee.URI == 'http://acs.amazonaws.com/groups/global/AuthenticatedUsers']" --output text |grep -v GRANTEE)
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CHECK_BUCKET_AUTHUSERS_ACL_SINGLE_LINE=$(echo -ne $CHECK_BUCKET_AUTHUSERS_ACL)
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## POLICY
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BUCKET_POLICY_STATUS=$($AWSCLI s3api get-bucket-policy-status $PROFILE_OPT --region $BUCKET_LOCATION --bucket $bucket --query PolicyStatus.IsPublic --output text 2>/dev/null)
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if [[ $CHECK_BUCKET_ALLUSERS_ACL || $CHECK_BUCKET_AUTHUSERS_ACL || $CHECK_BUCKET_ALLUSERS_POLICY == "True" ]]; then
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if [[ $CHECK_BUCKET_ALLUSERS_ACL || $CHECK_BUCKET_AUTHUSERS_ACL ]] && [[ $BUCKET_PUBLIC_BLOCK_IGNOREPUBLICACL != "True" ]];then
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if [[ $CHECK_BUCKET_ALLUSERS_ACL ]];then
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S3_FINDING_ALLUSERS_ACL="$bucket bucket ACL is open to the Internet (Everyone) with permissions: $CHECK_BUCKET_ALLUSERS_ACL_SINGLE_LINE"
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fi
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if [[ $CHECK_BUCKET_AUTHUSERS_ACL ]];then
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S3_FINDING_AUTHUSERS_ACL="$bucket bucket ACL is open to Authenticated users (Any AWS user) with permissions: $CHECK_BUCKET_AUTHUSERS_ACL_SINGLE_LINE"
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fi
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fi
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if [[ $BUCKET_PUBLIC_BLOCK_RESTRICPUBLICBUCKET != "True" ]] && [[ $BUCKET_POLICY_STATUS == "True" ]]; then
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# Here comes the magic: Look Statement Allow, Principal * and No Condition
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BUCKET_POLICY_ALLOW_ALL_WITHOUT_CONDITION=$($AWSCLI s3api get-bucket-policy $PROFILE_OPT --region $BUCKET_LOCATION --bucket $bucket \
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| jq '.Policy | fromjson' | jq '.Statement[] | select(.Effect=="Allow") | select(.Principal=="*" or .Principal.AWS=="*" or .Principal.CanonicalUser=="*") | select(has("Condition") | not)')
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if [[ $BUCKET_POLICY_ALLOW_ALL_WITHOUT_CONDITION ]]; then
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# Let's do more magic and identify who can do what
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BUCKET_POLICY_ALLOW_ALL_WITHOUT_CONDITION_DETAILS=$($AWSCLI s3api get-bucket-policy $PROFILE_OPT --region $BUCKET_LOCATION --bucket $bucket \
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| jq '.Policy | fromjson' | jq '.Statement[] | select(.Effect=="Allow") | select(.Principal=="*" or .Principal.AWS=="*" or .Principal.CanonicalUser=="*") | select(has("Condition") | not)' | jq '"[Principal: " + (.Principal|tostring) + " Action: " + .Action + "]"' )
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S3_FINDING_POLICY="$bucket bucket policy allow perform actions: $BUCKET_POLICY_ALLOW_ALL_WITHOUT_CONDITION_DETAILS"
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else
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textPass "$BUCKET_LOCATION: $bucket bucket policy with conditions" "$BUCKET_LOCATION"
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fi
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fi
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else
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textPass "$BUCKET_LOCATION: $bucket bucket is not open" "$bucket" "$BUCKET_LOCATION"
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fi
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fi
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fi
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if [[ $S3_FINDING_ALLUSERS_ACL != "Ok" ]] || [[ $S3_FINDING_AUTHUSERS_ACL != "Ok" ]] || [[ $S3_FINDING_POLICY != "Ok" ]] ; then
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textFail "$BUCKET_LOCATION: ALLUSERS_ACL: $S3_FINDING_ALLUSERS_ACL | AUTHUSERS_ACL: $S3_FINDING_AUTHUSERS_ACL | BUCKET_POLICY: $S3_FINDING_POLICY" "$BUCKET_LOCATION"
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fi
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done
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}
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# Then implementation below makes pararel checks but can reach AWS API limits
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# and eventually doesn't work as expected
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# extra73(){
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# textTitle "$ID73" "$TITLE73" "NOT_SCORED" "EXTRA"
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# textNotice "Looking for open S3 Buckets (ACLs and Policies) in all regions... "
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# ALL_BUCKETS_LIST=$($AWSCLI s3api list-buckets --query 'Buckets[*].{Name:Name}' --profile $PROFILE --region $REGION --output text)
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# for bucket in $ALL_BUCKETS_LIST; do
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# extra73Thread $bucket &
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# done
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# wait
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# }
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# extra73Thread(){
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# bucket=$1
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# BUCKET_LOCATION=$($AWSCLI s3api get-bucket-location --bucket $bucket --profile $PROFILE --region $REGION --output text)
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# if [[ "None" == $BUCKET_LOCATION ]]; then
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# BUCKET_LOCATION="us-east-1"
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# fi
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# if [[ "EU" == $BUCKET_LOCATION ]]; then
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# BUCKET_LOCATION="eu-west-1"
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# fi
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# # check if AllUsers is in the ACL as Grantee
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# CHECK_BUCKET_ALLUSERS_ACL=$($AWSCLI s3api get-bucket-acl --profile $PROFILE --region $BUCKET_LOCATION --bucket $bucket --query "Grants[?Grantee.URI == 'http://acs.amazonaws.com/groups/global/AllUsers']" --output text |grep -v GRANTEE)
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# CHECK_BUCKET_ALLUSERS_ACL_SINGLE_LINE=$(echo -ne $CHECK_BUCKET_ALLUSERS_ACL)
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# # check if AuthenticatedUsers is in the ACL as Grantee, they will have access with sigened URL only
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# CHECK_BUCKET_AUTHUSERS_ACL=$($AWSCLI s3api get-bucket-acl --profile $PROFILE --region $BUCKET_LOCATION --bucket $bucket --query "Grants[?Grantee.URI == 'http://acs.amazonaws.com/groups/global/AuthenticatedUsers']" --output text |grep -v GRANTEE)
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# CHECK_BUCKET_AUTHUSERS_ACL_SINGLE_LINE=$(echo -ne $CHECK_BUCKET_AUTHUSERS_ACL)
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# # to prevent error NoSuchBucketPolicy first clean the output controlling stderr
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# TEMP_POLICY_FILE=$(mktemp -t prowler-${ACCOUNT_NUM}-${bucket}.policy.XXXXXXXXXX)
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# $AWSCLI s3api get-bucket-policy --profile $PROFILE --region $BUCKET_LOCATION --bucket $bucket --output text --query Policy > $TEMP_POLICY_FILE 2> /dev/null
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# # check if the S3 policy has Principal as *
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# CHECK_BUCKET_ALLUSERS_POLICY=$(cat $TEMP_POLICY_FILE | sed -e 's/[{}]/''/g' | awk -v k="text" '{n=split($0,a,","); for (i=1; i<=n; i++) print a[i]}'|awk '/Principal/ && !skip { print } { skip = /Deny/} '|grep ^\"Principal|grep \*)
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# if [[ $CHECK_BUCKET_ALLUSERS_ACL || $CHECK_BUCKET_AUTHUSERS_ACL || $CHECK_BUCKET_ALLUSERS_POLICY ]];then
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# if [[ $CHECK_BUCKET_ALLUSERS_ACL ]];then
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# textWarn "$BUCKET_LOCATION: $bucket bucket is open to the Internet (Everyone) with permissions: $CHECK_BUCKET_ALLUSERS_ACL_SINGLE_LINE" "$BUCKET_LOCATION"
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# fi
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# if [[ $CHECK_BUCKET_AUTHUSERS_ACL ]];then
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# textWarn "$BUCKET_LOCATION: $bucket bucket is open to Authenticated users (Any AWS user) with permissions: $CHECK_BUCKET_AUTHUSERS_ACL_SINGLE_LINE" "$BUCKET_LOCATION"
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# fi
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# if [[ $CHECK_BUCKET_ALLUSERS_POLICY ]];then
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# textWarn "$BUCKET_LOCATION: $bucket bucket policy \"may\" allow Anonymous users to perform actions (Principal: \"*\")" "$BUCKET_LOCATION"
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# fi
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# else
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# textOK "$BUCKET_LOCATION: $bucket bucket is not open" "$BUCKET_LOCATION"
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# fi
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# rm -fr $TEMP_POLICY_FILE
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# }
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