#!/usr/bin/env bash

# Prowler - the handy cloud security tool (copyright 2018) by Toni de la Fuente
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy
# of the License at http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software distributed
# under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
# CONDITIONS OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the License.

CHECK_ID_extra77="7.7"
CHECK_TITLE_extra77="[extra77] Ensure there are no ECR repositories set as Public"
CHECK_SCORED_extra77="NOT_SCORED"
CHECK_CIS_LEVEL_extra77="EXTRA"
CHECK_SEVERITY_extra77="Critical"
CHECK_ALTERNATE_extra707="extra77"
CHECK_ALTERNATE_check77="extra77"
CHECK_ALTERNATE_check707="extra77"
CHECK_SERVICENAME_extra77="ecr"
CHECK_RISK_extra77='Policy may allow Anonymous users to perform actions.'
CHECK_REMEDIATION_extra77='Ensure this repository and its contents should be publicly accessible.'
CHECK_DOC_extra77='https://docs.aws.amazon.com/AmazonECR/latest/public/security_iam_service-with-iam.html'
CHECK_CAF_EPIC_extra77='Data Protection'

extra77(){
  # "Ensure there are no ECR repositories set as Public "
  for regx in $REGIONS; do
    LIST_ECR_REPOS=$($AWSCLI ecr describe-repositories $PROFILE_OPT --region $regx --query "repositories[*].[repositoryName]" --output text 2>&1)
    if [[ $(echo "$LIST_ECR_REPOS" | grep AccessDenied) ]]; then
      textInfo "$regx: Access Denied Trying to describe ECR repositories" "$regx" "$repo"
      continue
    fi
    if [[ $(echo "$LIST_ECR_REPOS" | grep SubscriptionRequiredException) ]]; then
      textInfo "$regx: Subscription Required Exception trying to describe ECR repositories" "$regx" "$repo"
      continue
    fi
    if [[ ! -z "$LIST_ECR_REPOS" ]]; then
      for repo in $LIST_ECR_REPOS; do
        TEMP_POLICY_FILE=$(mktemp -t prowler-${ACCOUNT_NUM}-ecr-repo.policy.XXXXXXXXXX)
        $AWSCLI ecr get-repository-policy $PROFILE_OPT --region $regx --repository-name $repo --query "policyText" --output text > $TEMP_POLICY_FILE 2>&1
        if [[ $(grep AccessDenied $TEMP_POLICY_FILE) ]]; then
          textInfo "$regx: Access Denied to get repository policy for repo $repo" "$regx" "$repo"
          rm -f $TEMP_POLICY_FILE
          continue
        fi
        # https://docs.aws.amazon.com/AmazonECR/latest/userguide/repository-policies.html - "By default, only the repository owner has access to a repository."
        if [[ $(grep RepositoryPolicyNotFoundException $TEMP_POLICY_FILE) ]]; then
          textPass "$regx: $repo is not open" "$regx" "$repo"
          rm -f $TEMP_POLICY_FILE
          continue
        fi
        # check if the policy has Principal as *
        CHECK_ECR_REPO_ALLUSERS_POLICY=$(cat $TEMP_POLICY_FILE | jq '.Statement[]|select(.Effect=="Allow" and (((.Principal|type == "object") and .Principal.AWS == "*") or ((.Principal|type == "string") and .Principal == "*")))')
        if [[ $CHECK_ECR_REPO_ALLUSERS_POLICY ]]; then
          textFail "$regx: $repo policy \"may\" allow Anonymous users to perform actions (Principal: \"*\")" "$regx"
        else
          textPass "$regx: $repo is not open" "$regx" "$repo"
        fi
        rm -f $TEMP_POLICY_FILE
      done
    else
      textInfo "$regx: No ECR repositories found" "$regx" "$repo"
    fi
  done
}