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Terraform module for creating alarms for tracking important changes and occurances from cloudtrail.

This module creates a set of filter metrics and alarms based on the security best practices covered in the AWS CIS Foundations Benchmark guide.

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Usage

module "metric_configs" {
  source  = "cloudposse/config/yaml"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"

  map_config_local_base_path = "./catalog"
  map_config_paths           = "*.yaml"

  context = module.this.context
}

module "cloudtrail_api_alarms" {
  source  = "cloudposse/cloudtrail-cloudwatch-alarms/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"

  log_group_name = "${aws_cloudwatch_log_group.default.name}"
  metrics = module.metric_configs.map_configs
}

For detailed usage which includes setting up cloudtrail, cloudwatch logs, roles, policies, and the s3 bucket - as well as using this module see the example directory

For aditional CIS rules and controls https://docs.aws.amazon.com/securityhub/latest/userguide/securityhub-cis-controls.html#securityhub-cis-controls-3.8

[!IMPORTANT] In Cloud Posse's examples, we avoid pinning modules to specific versions to prevent discrepancies between the documentation and the latest released versions. However, for your own projects, we strongly advise pinning each module to the exact version you're using. This practice ensures the stability of your infrastructure. Additionally, we recommend implementing a systematic approach for updating versions to avoid unexpected changes.

Examples

Here's a complete example of using this terraform-aws-cloudtrail-cloudwatch-alarms module.

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Requirements

NameVersion
<a name="requirement_terraform"></a> terraform>= 1.0
<a name="requirement_aws"></a> aws>= 4.0

Providers

NameVersion
<a name="provider_aws"></a> aws>= 4.0

Modules

NameSourceVersion
<a name="module_aws_sns_topic_label"></a> aws_sns_topic_labelcloudposse/label/null0.25.0
<a name="module_sns_kms_key"></a> sns_kms_keycloudposse/kms-key/aws0.10.0
<a name="module_sns_kms_key_label"></a> sns_kms_key_labelcloudposse/label/null0.25.0
<a name="module_this"></a> thiscloudposse/label/null0.25.0

Resources

NameType
aws_cloudwatch_dashboard.combinedresource
aws_cloudwatch_dashboard.individualresource
aws_cloudwatch_log_metric_filter.defaultresource
aws_cloudwatch_metric_alarm.defaultresource
aws_sns_topic.defaultresource
aws_sns_topic_policy.defaultresource
aws_caller_identity.defaultdata source
aws_iam_policy_document.sns_kms_key_policydata source
aws_iam_policy_document.sns_topic_policydata source
aws_region.currentdata source

Inputs

NameDescriptionTypeDefaultRequired
<a name="input_additional_endpoint_arns"></a> additional_endpoint_arnsAny alert endpoints, such as autoscaling, or app scaling endpoint arns that will respond to an alertlist(string)[]no
<a name="input_additional_tag_map"></a> additional_tag_mapAdditional key-value pairs to add to each map in tags_as_list_of_maps. Not added to tags or id.<br/>This is for some rare cases where resources want additional configuration of tags<br/>and therefore take a list of maps with tag key, value, and additional configuration.map(string){}no
<a name="input_attributes"></a> attributesID element. Additional attributes (e.g. workers or cluster) to add to id,<br/>in the order they appear in the list. New attributes are appended to the<br/>end of the list. The elements of the list are joined by the delimiter<br/>and treated as a single ID element.list(string)[]no
<a name="input_context"></a> contextSingle object for setting entire context at once.<br/>See description of individual variables for details.<br/>Leave string and numeric variables as null to use default value.<br/>Individual variable settings (non-null) override settings in context object,<br/>except for attributes, tags, and additional_tag_map, which are merged.any<pre>{<br/> "additional_tag_map": {},<br/> "attributes": [],<br/> "delimiter": null,<br/> "descriptor_formats": {},<br/> "enabled": true,<br/> "environment": null,<br/> "id_length_limit": null,<br/> "label_key_case": null,<br/> "label_order": [],<br/> "label_value_case": null,<br/> "labels_as_tags": [<br/> "unset"<br/> ],<br/> "name": null,<br/> "namespace": null,<br/> "regex_replace_chars": null,<br/> "stage": null,<br/> "tags": {},<br/> "tenant": null<br/>}</pre>no
<a name="input_dashboard_enabled"></a> dashboard_enabledWhen true a dashboard that displays the statistics as a line graph will be created in CloudWatchbooltrueno
<a name="input_delimiter"></a> delimiterDelimiter to be used between ID elements.<br/>Defaults to - (hyphen). Set to "" to use no delimiter at all.stringnullno
<a name="input_descriptor_formats"></a> descriptor_formatsDescribe additional descriptors to be output in the descriptors output map.<br/>Map of maps. Keys are names of descriptors. Values are maps of the form<br/>{<br/> format = string<br/> labels = list(string)<br/>}<br/>(Type is any so the map values can later be enhanced to provide additional options.)<br/>format is a Terraform format string to be passed to the format() function.<br/>labels is a list of labels, in order, to pass to format() function.<br/>Label values will be normalized before being passed to format() so they will be<br/>identical to how they appear in id.<br/>Default is {} (descriptors output will be empty).any{}no
<a name="input_enabled"></a> enabledSet to false to prevent the module from creating any resourcesboolnullno
<a name="input_environment"></a> environmentID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'stringnullno
<a name="input_id_length_limit"></a> id_length_limitLimit id to this many characters (minimum 6).<br/>Set to 0 for unlimited length.<br/>Set to null for keep the existing setting, which defaults to 0.<br/>Does not affect id_full.numbernullno
<a name="input_kms_master_key_id"></a> kms_master_key_idThe ID or alias of the customer master key (CMK) to use for encrypting the Amazon SNS topic.<br/> The CMK must have its resource-based policy allow the service cloudwatch.amazonaws.com to perform kms:Decrypt and kms:GenerateDataKey on it.<br/> If this variable is not supplied, a CMK with the sufficient resource-based policy will be created and used when configuring encryption for<br/> the SNS topic.stringnullno
<a name="input_label_key_case"></a> label_key_caseControls the letter case of the tags keys (label names) for tags generated by this module.<br/>Does not affect keys of tags passed in via the tags input.<br/>Possible values: lower, title, upper.<br/>Default value: title.stringnullno
<a name="input_label_order"></a> label_orderThe order in which the labels (ID elements) appear in the id.<br/>Defaults to ["namespace", "environment", "stage", "name", "attributes"].<br/>You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present.list(string)nullno
<a name="input_label_value_case"></a> label_value_caseControls the letter case of ID elements (labels) as included in id,<br/>set as tag values, and output by this module individually.<br/>Does not affect values of tags passed in via the tags input.<br/>Possible values: lower, title, upper and none (no transformation).<br/>Set this to title and set delimiter to "" to yield Pascal Case IDs.<br/>Default value: lower.stringnullno
<a name="input_labels_as_tags"></a> labels_as_tagsSet of labels (ID elements) to include as tags in the tags output.<br/>Default is to include all labels.<br/>Tags with empty values will not be included in the tags output.<br/>Set to [] to suppress all generated tags.<br/>Notes:<br/> The value of the name tag, if included, will be the id, not the name.<br/> Unlike other null-label inputs, the initial setting of labels_as_tags cannot be<br/> changed in later chained modules. Attempts to change it will be silently ignored.set(string)<pre>[<br/> "default"<br/>]</pre>no
<a name="input_log_group_name"></a> log_group_nameThe cloudtrail cloudwatch log group namestringn/ayes
<a name="input_log_group_region"></a> log_group_regionThe log group region that should be monitored for unauthorised AWS API Access. Current region used if none provided.string""no
<a name="input_metric_namespace"></a> metric_namespaceA namespace for grouping all of the metrics togetherstring"CISBenchmark"no
<a name="input_metrics"></a> metricsThe cloudwatch metrics and corresponding alarm definitions<pre>map(object({<br/> metric_name = string<br/> filter_pattern = string<br/> metric_namespace = string<br/> metric_value = string<br/> alarm_name = string<br/> alarm_comparison_operator = string<br/> alarm_evaluation_periods = string<br/> alarm_period = string<br/> alarm_statistic = string<br/> alarm_treat_missing_data = string<br/> alarm_threshold = string<br/> alarm_description = string<br/> }))</pre>{}no
<a name="input_name"></a> nameID element. Usually the component or solution name, e.g. 'app' or 'jenkins'.<br/>This is the only ID element not also included as a tag.<br/>The "name" tag is set to the full id string. There is no tag with the value of the name input.stringnullno
<a name="input_namespace"></a> namespaceID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally uniquestringnullno
<a name="input_regex_replace_chars"></a> regex_replace_charsTerraform regular expression (regex) string.<br/>Characters matching the regex will be removed from the ID elements.<br/>If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits.stringnullno
<a name="input_sns_policy_enabled"></a> sns_policy_enabledAttach a policy that allows the notifications through to the SNS topic endpointboolfalseno
<a name="input_sns_topic_arn"></a> sns_topic_arnAn SNS topic ARN that has already been created. Its policy must already allow access from CloudWatch Alarms, or set add_sns_policy to truestringnullno
<a name="input_stage"></a> stageID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'stringnullno
<a name="input_tags"></a> tagsAdditional tags (e.g. {'BusinessUnit': 'XYZ'}).<br/>Neither the tag keys nor the tag values will be modified by this module.map(string){}no
<a name="input_tenant"></a> tenantID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is forstringnullno

Outputs

NameDescription
<a name="output_dashboard_combined"></a> dashboard_combinedURL to CloudWatch Combined Metric Dashboard
<a name="output_dashboard_individual"></a> dashboard_individualURL to CloudWatch Individual Metric Dashboard
<a name="output_sns_topic_arn"></a> sns_topic_arnThe ARN of the SNS topic used
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Metrics Tracked

Alarm's NameDescription
AuthorizationFailureCountAlarms when an unauthorized API call is made.
S3BucketActivityEventCountAlarms when an API call is made to S3 to put or delete a Bucket, Bucket Policy or Bucket ACL.
SecurityGroupEventCountAlarms when an API call is made to create, update or delete a Security Group.
NetworkAclEventCountAlarms when an API call is made to create, update or delete a Network ACL.
GatewayEventCountAlarms when an API call is made to create, update or delete a Customer or Internet Gateway.
VpcEventCountAlarms when an API call is made to create, update or delete a VPC, VPC peering connection or VPC connection to classic.
EC2InstanceEventCountAlarms when an API call is made to create, terminate, start, stop or reboot an EC2 instance.
EC2LargeInstanceEventCountAlarms when an API call is made to create, terminate, start, stop or reboot a 4x-large or greater EC2 instance.
CloudTrailEventCountAlarms when an API call is made to create, update or delete a .cloudtrail. trail, or to start or stop logging to a trail.
ConsoleSignInFailureCountAlarms when an unauthenticated API call is made to sign into the console.
IAMPolicyEventCountAlarms when an API call is made to change an IAM policy.
ConsoleSignInWithoutMfaCountAlarms when a user logs into the console without MFA.
RootAccountUsageCountAlarms when a root account usage is detected.
KMSKeyPendingDeletionErrorCountAlarms when a customer created KMS key is pending deletion.
AWSConfigChangeCountAlarms when AWS Config changes.
RouteTableChangesCountAlarms when route table changes are detected.

Dashboard Created

Two CloudWatch Dashboards can be created as well, and will be automatically created by default.

CloudWatch Dashboard

Credits

The alarm metric names, descriptions, and filters from this repository were used.

With many thanks to Anton Babenko for pointing it out and saving us a lot of time scouring reference documents and describing alarms!

Related Projects

Check out these related projects.

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✨ Contributing

This project is under active development, and we encourage contributions from our community.

Many thanks to our outstanding contributors:

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For πŸ› bug reports & feature requests, please use the issue tracker.

In general, PRs are welcome. We follow the typical "fork-and-pull" Git workflow.

  1. Review our Code of Conduct and Contributor Guidelines.
  2. Fork the repo on GitHub
  3. Clone the project to your own machine
  4. Commit changes to your own branch
  5. Push your work back up to your fork
  6. Submit a Pull Request so that we can review your changes

NOTE: Be sure to merge the latest changes from "upstream" before making a pull request!

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<details> <summary>Preamble to the Apache License, Version 2.0</summary> <br/> <br/>

Complete license is available in the LICENSE file.

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