opensearch.sp

locals {
  conformance_pack_opensearch_common_tags = merge(local.aws_compliance_common_tags, {
    service = "AWS/OpenSearch"
  })
}

control "opensearch_domain_encryption_at_rest_enabled" {
  title       = "OpenSearch domains should have encryption at rest enabled"
  description = "This control checks whether Amazon OpenSearch domains have encryption-at-rest configuration enabled. The check fails if encryption at rest is not enabled."
  query       = query.opensearch_domain_encryption_at_rest_enabled

  tags = merge(local.conformance_pack_opensearch_common_tags, {
    pci_dss_v321 = "true"
  })
}

control "opensearch_domain_fine_grained_access_enabled" {
  title       = "OpenSearch domains should have fine-grained access control enabled"
  description = "This control checks whether OpenSearch domains have fine-grained access control enabled. The control fails if the fine-grained access control is not enabled. Fine-grained access control requires advanced-security-optionsin the OpenSearch parameter update-domain-config to be enabled."
  query       = query.opensearch_domain_fine_grained_access_enabled

  tags = merge(local.conformance_pack_opensearch_common_tags, {
    pci_dss_v321 = "true"
  })
}

control "opensearch_domain_https_required" {
  title       = "OpenSearch domains should use HTTPS"
  description = "This control checks whether connections to OpenSearch domains are using HTTPS. The rule is non compliant if the Amazon OpenSearch domain 'EnforceHTTPS' is not 'true' or is 'true' and 'TLSSecurityPolicy' is not in 'tlsPolicies'."
  query       = query.opensearch_domain_https_required

  tags = merge(local.conformance_pack_opensearch_common_tags, {
    pci_dss_v321 = "true"
  })
}

control "opensearch_domain_audit_logging_enabled" {
  title       = "OpenSearch domains should have audit logging enabled"
  description = "This control checks whether Amazon OpenSearch Service domains have audit logging enabled. The rule is non compliant if an OpenSearch Service domain does not have audit logging enabled."
  query       = query.opensearch_domain_audit_logging_enabled

  tags = merge(local.conformance_pack_opensearch_common_tags, {
    pci_dss_v321 = "true"
    soc_2        = "true"
  })
}

control "opensearch_domain_logs_to_cloudwatch" {
  title       = "OpenSearch domains logs to Amazon CloudWatch Logs"
  description = "This control checks whether Amazon OpenSearch Service domains are configured to send logs to Amazon CloudWatch Logs. The rule is non compliant if logging is not configured."
  query       = query.opensearch_domain_logs_to_cloudwatch


  tags = merge(local.conformance_pack_opensearch_common_tags, {
    pci_dss_v321 = "true"
    soc_2        = "true"
  })
}

query "opensearch_domain_encryption_at_rest_enabled" {
  sql = <<-EOQ
    select
      arn as resource,
      case
        when encryption_at_rest_options ->> 'Enabled' = 'false' then 'alarm'
        else 'ok'
      end as status,
      case
        when encryption_at_rest_options ->> 'Enabled' = 'false' then title || ' encryption at rest not enabled.'
        else title || ' encryption at rest enabled.'
      end as reason
      ${local.tag_dimensions_sql}
      ${local.common_dimensions_sql}
    from
      aws_opensearch_domain;
  EOQ
}

query "opensearch_domain_fine_grained_access_enabled" {
  sql = <<-EOQ
    select
      arn as resource,
      case
        when advanced_security_options is null or not (advanced_security_options -> 'Enabled')::boolean then 'alarm'
        else 'ok'
      end as status,
      case
        when advanced_security_options is null or not (advanced_security_options -> 'Enabled')::boolean then title || ' has fine-grained access control disabled.'
        else title || ' has fine-grained access control enabled.'
      end as reason
      ${local.tag_dimensions_sql}
      ${local.common_dimensions_sql}
    from
      aws_opensearch_domain;
  EOQ
}

query "opensearch_domain_https_required" {
  sql = <<-EOQ
    select
      arn as resource,
      case
        when (domain_endpoint_options ->> 'EnforceHTTPS' = 'false') or (domain_endpoint_options ->> 'EnforceHTTPS' = 'true' and domain_endpoint_options ->> 'TLSSecurityPolicy' not in ('tlsPolicies')) then 'alarm'
        else 'ok'
      end status,
      case
        when (domain_endpoint_options ->> 'EnforceHTTPS' = 'false') or (domain_endpoint_options ->> 'EnforceHTTPS' = 'true' and domain_endpoint_options ->> 'TLSSecurityPolicy' not in ('tlsPolicies')) then title || ' does not use HTTPS.'
        else title || ' uses HTTPS.'
      end as reason
      ${local.tag_dimensions_sql}
      ${local.common_dimensions_sql}
    from
      aws_opensearch_domain;
  EOQ
}

query "opensearch_domain_audit_logging_enabled" {
  sql = <<-EOQ
    select
      arn as resource,
      case
        when log_publishing_options -> 'AUDIT_LOGS' ->> 'Enabled' = 'true' then 'ok'
        else 'ok'
      end as status,
      case
        when log_publishing_options -> 'AUDIT_LOGS' ->> 'Enabled' = 'true' then title || ' audit logging enabled.'
        else title || ' audit logging disabled.'
      end as reason
      ${local.tag_dimensions_sql}
      ${local.common_dimensions_sql}
    from
      aws_opensearch_domain;
  EOQ
}

query "opensearch_domain_logs_to_cloudwatch" {
  sql = <<-EOQ
    select
      arn as resource,
      case
        when log_publishing_options is null then 'alarm'
        when
          ( log_publishing_options -> 'AUDIT_LOGS' is null
            or log_publishing_options -> 'AUDIT_LOGS' -> 'Enabled' = 'false'
            or (log_publishing_options -> 'AUDIT_LOGS' -> 'Enabled' = 'true' and log_publishing_options -> 'AUDIT_LOGS' -> 'CloudWatchLogsLogGroupArn' is not null)
          )
          and
          ( log_publishing_options -> 'INDEX_SLOW_LOGS' is null
            or log_publishing_options -> 'INDEX_SLOW_LOGS' -> 'Enabled' = 'false'
            or (log_publishing_options -> 'INDEX_SLOW_LOGS' -> 'Enabled' = 'true' and log_publishing_options -> 'INDEX_SLOW_LOGS' -> 'CloudWatchLogsLogGroupArn' is not null)
          )
          and
          ( log_publishing_options -> 'SEARCH_SLOW_LOGS' is null
            or log_publishing_options -> 'SEARCH_SLOW_LOGS' -> 'Enabled' = 'false'
            or (log_publishing_options -> 'SEARCH_SLOW_LOGS' -> 'Enabled' = 'true' and log_publishing_options -> 'SEARCH_SLOW_LOGS' -> 'CloudWatchLogsLogGroupArn' is not null)
          )
          and
          ( log_publishing_options -> 'ES_APPLICATION_LOGS' is null
            or log_publishing_options -> 'ES_APPLICATION_LOGS' -> 'Enabled' = 'false'
            or (log_publishing_options -> 'ES_APPLICATION_LOGS' -> 'Enabled' = 'true' and log_publishing_options -> 'ES_APPLICATION_LOGS' -> 'CloudWatchLogsLogGroupArn' is not null)
          )
          then 'ok'
        else 'alarm'
      end as status,
      case
        when log_publishing_options is null then title || ' logging not enabled.'
        when
          ( log_publishing_options -> 'AUDIT_LOGS' is null
            or log_publishing_options -> 'AUDIT_LOGS' -> 'Enabled' = 'false'
            or (log_publishing_options -> 'AUDIT_LOGS' -> 'Enabled' = 'true' and log_publishing_options -> 'AUDIT_LOGS' -> 'CloudWatchLogsLogGroupArn' is not null)
          )
          and
          ( log_publishing_options -> 'INDEX_SLOW_LOGS' is null
            or log_publishing_options -> 'INDEX_SLOW_LOGS' -> 'Enabled' = 'false'
            or (log_publishing_options -> 'INDEX_SLOW_LOGS' -> 'Enabled' = 'true' and log_publishing_options -> 'INDEX_SLOW_LOGS' -> 'CloudWatchLogsLogGroupArn' is not null)
          )
          and
          ( log_publishing_options -> 'SEARCH_SLOW_LOGS' is null
            or log_publishing_options -> 'SEARCH_SLOW_LOGS' -> 'Enabled' = 'false'
            or (log_publishing_options -> 'SEARCH_SLOW_LOGS' -> 'Enabled' = 'true' and log_publishing_options -> 'SEARCH_SLOW_LOGS' -> 'CloudWatchLogsLogGroupArn' is not null)
          )
          and
          ( log_publishing_options -> 'ES_APPLICATION_LOGS' is null
            or log_publishing_options -> 'ES_APPLICATION_LOGS' -> 'Enabled' = 'false'
            or (log_publishing_options -> 'ES_APPLICATION_LOGS' -> 'Enabled' = 'true' and log_publishing_options -> 'ES_APPLICATION_LOGS' -> 'CloudWatchLogsLogGroupArn' is not null)
          ) then title || ' send logs to Amazon CloudWatch.'
        else title || ' does not send logs to Amazon CloudWatch.'
      end as reason
      ${local.tag_dimensions_sql}
      ${local.common_dimensions_sql}
    from
      aws_opensearch_domain;
  EOQ
}

# Non-Config rule query

query "opensearch_domain_in_vpc" {
  sql = <<-EOQ
    with public_subnets as (
      select
        distinct a -> 'SubnetId' as SubnetId
      from
        aws_vpc_route_table as t,
        jsonb_array_elements(associations) as a,
        jsonb_array_elements(routes) as r
      where
        r ->> 'DestinationCidrBlock' = '0.0.0.0/0'
        and  r ->>  'GatewayId' like 'igw-%'
    ), opensearch_domain_with_public_subnet as (
      select
        arn
      from
        aws_opensearch_domain ,
        jsonb_array_elements(vpc_options -> 'SubnetIds') as s
      where
        s in (select SubnetId from public_subnets)
    )
    select
      d.arn as resource,
      case
        when d.vpc_options ->> 'VPCId' is null then 'alarm'
        when d.vpc_options ->> 'VPCId' is not null and p.arn is not null then 'alarm'
        else 'ok'
      end status,
      case
        when vpc_options ->> 'VPCId' is null then title || ' not in VPC.'
        when d.vpc_options ->> 'VPCId' is not null and p.arn is not null then title || ' attached to public subnet.'
        else title || ' in VPC ' || (vpc_options ->> 'VPCId') || '.'
      end reason
      ${replace(local.tag_dimensions_qualifier_sql, "__QUALIFIER__", "d.")}
      ${replace(local.common_dimensions_qualifier_sql, "__QUALIFIER__", "d.")}
    from
      aws_opensearch_domain as d left join opensearch_domain_with_public_subnet as p
      on d.arn = p.arn;
  EOQ
}