/terraform-aws-waf

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Cloud Posse

Terraform module to create and manage AWS WAFv2 rules.

This project is part of our comprehensive "SweetOps" approach towards DevOps.

Terraform Open Source Modules

It's 100% Open Source and licensed under the APACHE2.

We literally have hundreds of terraform modules that are Open Source and well-maintained. Check them out!

Security & Compliance

Security scanning is graciously provided by Bridgecrew. Bridgecrew is the leading fully hosted, cloud-native solution providing continuous Terraform security and compliance.

Benchmark Description
Infrastructure Security Infrastructure Security Compliance
CIS KUBERNETES Center for Internet Security, KUBERNETES Compliance
CIS AWS Center for Internet Security, AWS Compliance
CIS AZURE Center for Internet Security, AZURE Compliance
PCI-DSS Payment Card Industry Data Security Standards Compliance
NIST-800-53 National Institute of Standards and Technology Compliance
ISO27001 Information Security Management System, ISO/IEC 27001 Compliance
SOC2 Service Organization Control 2 Compliance
CIS GCP Center for Internet Security, GCP Compliance
HIPAA Health Insurance Portability and Accountability Compliance

Usage

IMPORTANT: We do not pin modules to versions in our examples because of the difficulty of keeping the versions in the documentation in sync with the latest released versions. We highly recommend that in your code you pin the version to the exact version you are using so that your infrastructure remains stable, and update versions in a systematic way so that they do not catch you by surprise.

Also, because of a bug in the Terraform registry (hashicorp/terraform#21417), the registry shows many of our inputs as required when in fact they are optional. The table below correctly indicates which inputs are required.

For a complete example, see examples/complete.

For automated tests of the complete example using bats and Terratest (which tests and deploys the example on AWS), see test.

module "label" {
  source = "cloudposse/label/null"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"
  namespace = "eg"
  stage     = "prod"
  name      = "waf"
  delimiter = "-"

  tags = {
    "BusinessUnit" = "XYZ",
  }
}

module "waf" {
  source = "cloudposse/waf/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"

  geo_match_statement_rules = [
    {
      name     = "rule-10"
      action   = "count"
      priority = 10

      statement = {
        country_codes = ["NL", "GB"]
      }

      visibility_config = {
        cloudwatch_metrics_enabled = true
        sampled_requests_enabled   = false
        metric_name                = "rule-10-metric"
      }
    },
    {
      name     = "rule-11"
      action   = "allow"
      priority = 11

      statement = {
        country_codes = ["US"]
      }

      visibility_config = {
        cloudwatch_metrics_enabled = true
        sampled_requests_enabled   = false
        metric_name                = "rule-11-metric"
      }
    }
  ]

  context = module.label.context
}

Examples

Here is an example of using this module:

Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code

Requirements

Name Version
terraform >= 0.13.0
aws >= 2.0

Providers

Name Version
aws >= 2.0

Modules

Name Source Version
this cloudposse/label/null 0.25.0

Resources

Name Type
aws_wafv2_web_acl.default resource
aws_wafv2_web_acl_association.default resource
aws_wafv2_web_acl_logging_configuration.default resource

Inputs

Name Description Type Default Required
additional_tag_map Additional key-value pairs to add to each map in tags_as_list_of_maps. Not added to tags or id.
This is for some rare cases where resources want additional configuration of tags
and therefore take a list of maps with tag key, value, and additional configuration.		 map(string) {} no
association_resource_arns A list of ARNs of the resources to associate with the web ACL.
This must be an ARN of an Application Load Balancer or an Amazon API Gateway stage.		 list(string) [] no
attributes ID element. Additional attributes (e.g. workers or cluster) to add to id,
in the order they appear in the list. New attributes are appended to the
end of the list. The elements of the list are joined by the delimiter
and treated as a single ID element.		 list(string) [] no
byte_match_statement_rules A rule statement that defines a string match search for AWS WAF to apply to web requests.

action:
The action that AWS WAF should take on a web request when it matches the rule's statement.
name:
A friendly name of the rule.
priority:
If you define more than one Rule in a WebACL,
AWS WAF evaluates each request against the rules in order based on the value of priority.
AWS WAF processes rules with lower priority first.

statement:
field_to_match:
The part of a web request that you want AWS WAF to inspect.
See https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/wafv2_web_acl#field-to-match
text_transformation:
Text transformations eliminate some of the unusual formatting that attackers use in web requests in an effort to bypass detection.
See https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/wafv2_web_acl#text-transformation

visibility_config:
Defines and enables Amazon CloudWatch metrics and web request sample collection.

cloudwatch_metrics_enabled:
Whether the associated resource sends metrics to CloudWatch.
metric_name:
A friendly name of the CloudWatch metric.
sampled_requests_enabled:
Whether AWS WAF should store a sampling of the web requests that match the rules.		 list(any) null no
context Single object for setting entire context at once.
See description of individual variables for details.
Leave string and numeric variables as null to use default value.
Individual variable settings (non-null) override settings in context object,
except for attributes, tags, and additional_tag_map, which are merged.		 any 
{
  "additional_tag_map": {},
  "attributes": [],
  "delimiter": null,
  "descriptor_formats": {},
  "enabled": true,
  "environment": null,
  "id_length_limit": null,
  "label_key_case": null,
  "label_order": [],
  "label_value_case": null,
  "labels_as_tags": [
    "unset"
  ],
  "name": null,
  "namespace": null,
  "regex_replace_chars": null,
  "stage": null,
  "tags": {},
  "tenant": null
}
 no
default_action Specifies that AWS WAF should allow requests by default. Possible values: allow, block. string "block" no
delimiter Delimiter to be used between ID elements.
Defaults to - (hyphen). Set to "" to use no delimiter at all.		 string null no
description A friendly description of the WebACL. string "Managed by Terraform" no
descriptor_formats Describe additional descriptors to be output in the descriptors output map.
Map of maps. Keys are names of descriptors. Values are maps of the form
{<br> format = string<br> labels = list(string)<br>}
(Type is any so the map values can later be enhanced to provide additional options.)
format is a Terraform format string to be passed to the format() function.
labels is a list of labels, in order, to pass to format() function.
Label values will be normalized before being passed to format() so they will be
identical to how they appear in id.
Default is {} (descriptors output will be empty).		 any {} no
enabled Set to false to prevent the module from creating any resources bool null no
environment ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT' string null no
geo_match_statement_rules A rule statement used to identify web requests based on country of origin.

action:
The action that AWS WAF should take on a web request when it matches the rule's statement.
name:
A friendly name of the rule.
priority:
If you define more than one Rule in a WebACL,
AWS WAF evaluates each request against the rules in order based on the value of priority.
AWS WAF processes rules with lower priority first.

statement:
country_codes:
A list of two-character country codes.
forwarded_ip_config:
fallback_behavior:
The match status to assign to the web request if the request doesn't have a valid IP address in the specified position.
Possible values: MATCH, NO_MATCH
header_name:
The name of the HTTP header to use for the IP address.

visibility_config:
Defines and enables Amazon CloudWatch metrics and web request sample collection.

cloudwatch_metrics_enabled:
Whether the associated resource sends metrics to CloudWatch.
metric_name:
A friendly name of the CloudWatch metric.
sampled_requests_enabled:
Whether AWS WAF should store a sampling of the web requests that match the rules.		 list(any) null no
id_length_limit Limit id to this many characters (minimum 6).
Set to 0 for unlimited length.
Set to null for keep the existing setting, which defaults to 0.
Does not affect id_full.		 number null no
ip_set_reference_statement_rules A rule statement used to detect web requests coming from particular IP addresses or address ranges.

action:
The action that AWS WAF should take on a web request when it matches the rule's statement.
name:
A friendly name of the rule.
priority:
If you define more than one Rule in a WebACL,
AWS WAF evaluates each request against the rules in order based on the value of priority.
AWS WAF processes rules with lower priority first.

statement:
arn:
The ARN of the IP Set that this statement references.
ip_set_forwarded_ip_config:
fallback_behavior:
The match status to assign to the web request if the request doesn't have a valid IP address in the specified position.
Possible values: MATCH, NO_MATCH
header_name:
The name of the HTTP header to use for the IP address.
position:
The position in the header to search for the IP address.
Possible values include: FIRST, LAST, or ANY.

visibility_config:
Defines and enables Amazon CloudWatch metrics and web request sample collection.

cloudwatch_metrics_enabled:
Whether the associated resource sends metrics to CloudWatch.
metric_name:
A friendly name of the CloudWatch metric.
sampled_requests_enabled:
Whether AWS WAF should store a sampling of the web requests that match the rules.		 list(any) null no
label_key_case Controls the letter case of the tags keys (label names) for tags generated by this module.
Does not affect keys of tags passed in via the tags input.
Possible values: lower, title, upper.
Default value: title.		 string null no
label_order The order in which the labels (ID elements) appear in the id.
Defaults to ["namespace", "environment", "stage", "name", "attributes"].
You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present.		 list(string) null no
label_value_case Controls the letter case of ID elements (labels) as included in id,
set as tag values, and output by this module individually.
Does not affect values of tags passed in via the tags input.
Possible values: lower, title, upper and none (no transformation).
Set this to title and set delimiter to "" to yield Pascal Case IDs.
Default value: lower.		 string null no
labels_as_tags Set of labels (ID elements) to include as tags in the tags output.
Default is to include all labels.
Tags with empty values will not be included in the tags output.
Set to [] to suppress all generated tags.
Notes:
The value of the name tag, if included, will be the id, not the name.
Unlike other null-label inputs, the initial setting of labels_as_tags cannot be
changed in later chained modules. Attempts to change it will be silently ignored.		 set(string) 
[
  "default"
]
 no
log_destination_configs The Amazon Kinesis Data Firehose ARNs. list(string) [] no
managed_rule_group_statement_rules A rule statement used to run the rules that are defined in a managed rule group.

name:
A friendly name of the rule.
priority:
If you define more than one Rule in a WebACL,
AWS WAF evaluates each request against the rules in order based on the value of priority.
AWS WAF processes rules with lower priority first.

override_action:
The override action to apply to the rules in a rule group.
Possible values: count, none

statement:
name:
The name of the managed rule group.
vendor_name:
The name of the managed rule group vendor.
excluded_rule:
The list of names of the rules to exclude.

visibility_config:
Defines and enables Amazon CloudWatch metrics and web request sample collection.

cloudwatch_metrics_enabled:
Whether the associated resource sends metrics to CloudWatch.
metric_name:
A friendly name of the CloudWatch metric.
sampled_requests_enabled:
Whether AWS WAF should store a sampling of the web requests that match the rules.		 list(any) null no
name ID element. Usually the component or solution name, e.g. 'app' or 'jenkins'.
This is the only ID element not also included as a tag.
The "name" tag is set to the full id string. There is no tag with the value of the name input.		 string null no
namespace ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique string null no
rate_based_statement_rules A rate-based rule tracks the rate of requests for each originating IP address,
and triggers the rule action when the rate exceeds a limit that you specify on the number of requests in any 5-minute time span.

action:
The action that AWS WAF should take on a web request when it matches the rule's statement.
name:
A friendly name of the rule.
priority:
If you define more than one Rule in a WebACL,
AWS WAF evaluates each request against the rules in order based on the value of priority.
AWS WAF processes rules with lower priority first.

statement:
aggregate_key_type:
Setting that indicates how to aggregate the request counts.
Possible values include: FORWARDED_IP or IP
limit:
The limit on requests per 5-minute period for a single originating IP address.
forwarded_ip_config:
fallback_behavior:
The match status to assign to the web request if the request doesn't have a valid IP address in the specified position.
Possible values: MATCH, NO_MATCH
header_name:
The name of the HTTP header to use for the IP address.

visibility_config:
Defines and enables Amazon CloudWatch metrics and web request sample collection.

cloudwatch_metrics_enabled:
Whether the associated resource sends metrics to CloudWatch.
metric_name:
A friendly name of the CloudWatch metric.
sampled_requests_enabled:
Whether AWS WAF should store a sampling of the web requests that match the rules.		 list(any) null no
redacted_fields The parts of the request that you want to keep out of the logs.

method_enabled:
Whether to enable redaction of the HTTP method.
The method indicates the type of operation that the request is asking the origin to perform.
uri_path_enabled:
Whether to enable redaction of the URI path.
This is the part of a web request that identifies a resource.
query_string_enabled:
Whether to enable redaction of the query string.
This is the part of a URL that appears after a ? character, if any.
single_header:
The list of names of the query headers to redact.		 map(any) {} no
regex_pattern_set_reference_statement_rules A rule statement used to search web request components for matches with regular expressions.

action:
The action that AWS WAF should take on a web request when it matches the rule's statement.
name:
A friendly name of the rule.
priority:
If you define more than one Rule in a WebACL,
AWS WAF evaluates each request against the rules in order based on the value of priority.
AWS WAF processes rules with lower priority first.

statement:
arn:
The Amazon Resource Name (ARN) of the Regex Pattern Set that this statement references.
field_to_match:
The part of a web request that you want AWS WAF to inspect.
See https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/wafv2_web_acl#field-to-match
text_transformation:
Text transformations eliminate some of the unusual formatting that attackers use in web requests in an effort to bypass detection.
See https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/wafv2_web_acl#text-transformation

visibility_config:
Defines and enables Amazon CloudWatch metrics and web request sample collection.

cloudwatch_metrics_enabled:
Whether the associated resource sends metrics to CloudWatch.
metric_name:
A friendly name of the CloudWatch metric.
sampled_requests_enabled:
Whether AWS WAF should store a sampling of the web requests that match the rules.		 list(any) null no
regex_replace_chars Terraform regular expression (regex) string.
Characters matching the regex will be removed from the ID elements.
If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits.		 string null no
rule_group_reference_statement_rules A rule statement used to run the rules that are defined in an WAFv2 Rule Group.

name:
A friendly name of the rule.
priority:
If you define more than one Rule in a WebACL,
AWS WAF evaluates each request against the rules in order based on the value of priority.
AWS WAF processes rules with lower priority first.

override_action:
The override action to apply to the rules in a rule group.
Possible values: count, none

statement:
arn:
The ARN of the aws_wafv2_rule_group resource.
excluded_rule:
The list of names of the rules to exclude.

visibility_config:
Defines and enables Amazon CloudWatch metrics and web request sample collection.

cloudwatch_metrics_enabled:
Whether the associated resource sends metrics to CloudWatch.
metric_name:
A friendly name of the CloudWatch metric.
sampled_requests_enabled:
Whether AWS WAF should store a sampling of the web requests that match the rules.		 list(any) null no
scope Specifies whether this is for an AWS CloudFront distribution or for a regional application.
Possible values are CLOUDFRONT or REGIONAL.
To work with CloudFront, you must also specify the region us-east-1 (N. Virginia) on the AWS provider.		 string "REGIONAL" no
size_constraint_statement_rules A rule statement that uses a comparison operator to compare a number of bytes against the size of a request component.

action:
The action that AWS WAF should take on a web request when it matches the rule's statement.
name:
A friendly name of the rule.
priority:
If you define more than one Rule in a WebACL,
AWS WAF evaluates each request against the rules in order based on the value of priority.
AWS WAF processes rules with lower priority first.

statement:
comparison_operator:
The operator to use to compare the request part to the size setting.
Possible values: EQ, NE, LE, LT, GE, or GT.
size:
The size, in bytes, to compare to the request part, after any transformations.
Valid values are integers between 0 and 21474836480, inclusive.
field_to_match:
The part of a web request that you want AWS WAF to inspect.
See https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/wafv2_web_acl#field-to-match
text_transformation:
Text transformations eliminate some of the unusual formatting that attackers use in web requests in an effort to bypass detection.
See https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/wafv2_web_acl#text-transformation

visibility_config:
Defines and enables Amazon CloudWatch metrics and web request sample collection.

cloudwatch_metrics_enabled:
Whether the associated resource sends metrics to CloudWatch.
metric_name:
A friendly name of the CloudWatch metric.
sampled_requests_enabled:
Whether AWS WAF should store a sampling of the web requests that match the rules.		 list(any) null no
sqli_match_statement_rules An SQL injection match condition identifies the part of web requests,
such as the URI or the query string, that you want AWS WAF to inspect.

action:
The action that AWS WAF should take on a web request when it matches the rule's statement.
name:
A friendly name of the rule.
priority:
If you define more than one Rule in a WebACL,
AWS WAF evaluates each request against the rules in order based on the value of priority.
AWS WAF processes rules with lower priority first.

statement:
field_to_match:
The part of a web request that you want AWS WAF to inspect.
See https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/wafv2_web_acl#field-to-match
text_transformation:
Text transformations eliminate some of the unusual formatting that attackers use in web requests in an effort to bypass detection.
See https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/wafv2_web_acl#text-transformation

visibility_config:
Defines and enables Amazon CloudWatch metrics and web request sample collection.

cloudwatch_metrics_enabled:
Whether the associated resource sends metrics to CloudWatch.
metric_name:
A friendly name of the CloudWatch metric.
sampled_requests_enabled:
Whether AWS WAF should store a sampling of the web requests that match the rules.		 list(any) null no
stage ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release' string null no
tags Additional tags (e.g. {'BusinessUnit': 'XYZ'}).
Neither the tag keys nor the tag values will be modified by this module.		 map(string) {} no
tenant ID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is for string null no
visibility_config Defines and enables Amazon CloudWatch metrics and web request sample collection.

cloudwatch_metrics_enabled:
Whether the associated resource sends metrics to CloudWatch.
metric_name:
A friendly name of the CloudWatch metric.
sampled_requests_enabled:
Whether AWS WAF should store a sampling of the web requests that match the rules.		 map(string) {} no
xss_match_statement_rules A rule statement that defines a cross-site scripting (XSS) match search for AWS WAF to apply to web requests.

action:
The action that AWS WAF should take on a web request when it matches the rule's statement.
name:
A friendly name of the rule.
priority:
If you define more than one Rule in a WebACL,
AWS WAF evaluates each request against the rules in order based on the value of priority.
AWS WAF processes rules with lower priority first.

xss_match_statement:
field_to_match:
The part of a web request that you want AWS WAF to inspect.
See https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/wafv2_web_acl#field-to-match
text_transformation:
Text transformations eliminate some of the unusual formatting that attackers use in web requests in an effort to bypass detection.
See https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/wafv2_web_acl#text-transformation

visibility_config:
Defines and enables Amazon CloudWatch metrics and web request sample collection.

cloudwatch_metrics_enabled:
Whether the associated resource sends metrics to CloudWatch.
metric_name:
A friendly name of the CloudWatch metric.
sampled_requests_enabled:
Whether AWS WAF should store a sampling of the web requests that match the rules.		 list(any) null no

Outputs

Name Description
arn The ARN of the WAF WebACL.
capacity The web ACL capacity units (WCUs) currently being used by this web ACL.
id The ID of the WAF WebACL.
logging_config_id The ARN of the WAFv2 Web ACL logging configuration.

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Related Projects

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  • terraform-null-label - Terraform Module to define a consistent naming convention by (namespace, stage, name, [attributes])

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Contributors

Vladimir Syromyatnikov
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