Log fields - AWS WAF, AWS Firewall Manager, and AWS Shield Advanced

Log fields

The following list describes the possible log fields.

action

The terminating action that AWS WAF applied to the request. This indicates either allow, block, CAPTCHA, or challenge. The CAPTCHA and Challenge actions are terminating when the web request doesn't contain a valid token.

args

The query string.

captchaResponse

The CAPTCHA action status for the request, populated when a CAPTCHA action is applied to the request. This field is populated for any CAPTCHA action, whether terminating or non-terminating. If a request has the CAPTCHA action applied multiple times, this field is populated from the last time the action was applied.

The CAPTCHA action terminates web request inspection when the request either doesn't include a token or the token is invalid or expired. If the CAPTCHA action is terminating, this field includes a response code and failure reason. If the action is non-terminating, this field includes a solve timestamp. To differentiate between a terminating and non-terminating action, you can filter for a non-empty failureReason attribute in this field.

challengeResponse

The challenge action status for the request, populated when a Challenge action is applied to the request. This field is populated for any Challenge action, whether terminating or non-terminating. If a request has the Challenge action applied multiple times, this field is populated from the last time the action was applied.

The Challenge action terminates web request inspection when the request either doesn't include a token or the token is invalid or expired. If the Challenge action is terminating, this field includes a response code and failure reason. If the action is non-terminating, this field includes a solve timestamp. To differentiate between a terminating and non-terminating action, you can filter for a non-empty failureReason attribute in this field.

clientIp

The IP address of the client sending the request.

country

The source country of the request. If AWS WAF is unable to determine the country of origin, it sets this field to -.

excludedRules

Used only for rule group rules. The list of rules in the rule group that you have excluded. The action for these rules is set to Count.

If you override a rule to count using the override rule action option, matches aren't listed here. They're listed as the action pairs action and overriddenAction.

exclusionType

A type that indicates that the excluded rule has the action Count.

ruleId

The ID of the rule within the rule group that is excluded.

formatVersion

The format version for the log.

headers

The list of headers.

httpMethod

The HTTP method in the request.

httpRequest

The metadata about the request.

httpSourceId

The ID of the associated resource:

  • For an Amazon CloudFront distribution, the ID is the distribution-id in the ARN syntax:

    arn:partitioncloudfront::account-id:distribution/distribution-id

  • For an Application Load Balancer, the ID is the load-balancer-id in the ARN syntax:

    arn:partition:elasticloadbalancing:region:account-id:loadbalancer/app/load-balancer-name/load-balancer-id

  • For an Amazon API Gateway REST API, the ID is the api-id in the ARN syntax:

    arn:partition:apigateway:region::/restapis/api-id/stages/stage-name

  • For an AWS AppSync GraphQL API, the ID is the GraphQLApiId in the ARN syntax:

    arn:partition:appsync:region:account-id:apis/GraphQLApiId

  • For an Amazon Cognito user pool, the ID is the user-pool-id in the ARN syntax:

    arn:partition:cognito-idp:region:account-id:userpool/user-pool-id

  • For an AWS App Runner service, the ID is the apprunner-service-id in the ARN syntax:

    arn:partition:apprunner:region:account-id:service/apprunner-service-name/apprunner-service-id

httpSourceName

The source of the request. Possible values: CF for Amazon CloudFront, APIGW for Amazon API Gateway, ALB for Application Load Balancer, APPSYNC for AWS AppSync, COGNITOIDP for Amazon Cognito, APPRUNNER for App Runner, and VERIFIED_ACCESS for Verified Access.

httpVersion

The HTTP version.

ja3Fingerprint

The JA3 fingerprint of the request.

Note

JA3 fingerprint inspection is available only for Amazon CloudFront distributions and Application Load Balancers.

The JA3 fingerprint is a 32-character hash derived from the TLS Client Hello of an incoming request. This fingerprint serves as a unique identifier for the client's TLS configuration. AWS WAF calculates and logs this fingerprint for each request that has enough TLS Client Hello information for the calculation.

You provide this value when you configure a JA3 fingerprint match in your web ACL rules. For information about creating a match against the JA3 fingerprint, see JA3 fingerprint in the Request component options for a rule statement.

labels

The labels on the web request. These labels were applied by rules that were used to evaluate the request. AWS WAF logs the first 100 labels.

nonTerminatingMatchingRules

The list of non-terminating rules that matched the request. Each item in the list contains the following information.

action

The action that AWS WAF applied to the request. This indicates either count, CAPTCHA, or challenge. The CAPTCHA and Challenge are non-terminating when the web request contains a valid token.

ruleId

The ID of the rule that matched the request and was non-terminating.

ruleMatchDetails

Detailed information about the rule that matched the request. This field is only populated for SQL injection and cross-site scripting (XSS) match rule statements. A matching rule might require a match for more than one inspection criteria, so these match details are provided as an array of match criteria.

Any additional information provided for each rule varies according factors such as the rule configuration, rule match type, and details of the match. For example for rules with a CAPTCHA or Challenge action, the captchaResponse or challengeResponse will be listed. If the matching rule is in a rule group and you've overridden its configured rule action, the configured action will be provided in overriddenAction.

oversizeFields

The list of fields in the web request that were inspected by the web ACL and that are over the AWS WAF inspection limit. If a field is oversize but the web ACL doesn't inspect it, it won't be listed here.

This list can contain zero or more of the following values: REQUEST_BODY, REQUEST_JSON_BODY, REQUEST_HEADERS, and REQUEST_COOKIES. For more information about oversize fields, see Handling of oversize request components in AWS WAF.

rateBasedRuleList

The list of rate-based rules that acted on the request. For information about rate-based rules, see Rate-based rule statement.

rateBasedRuleId

The ID of the rate-based rule that acted on the request. If this has terminated the request, the ID for rateBasedRuleId is the same as the ID for terminatingRuleId.

rateBasedRuleName

The name of the rate-based rule that acted on the request.

limitKey

The type of aggregation that the rule is using. Possible values are IP for web request origin, FORWARDED_IP for an IP forwarded in a header in the request, CUSTOMKEYS for custom aggregate key settings. and CONSTANT for count all requests together, with no aggregation.

limitValue

Used only when rate limiting by a single IP address type. If a request contains an IP address that isn't valid, the limitvalue is INVALID.

maxRateAllowed

The maximum number of requests allowed in the specified time window for a specific aggregation instance. The aggregation instance is defined by the limitKey plus any additional key specifications that you've provided in the rate-based rule configuration.

evaluationWindowSec

The amount of time that AWS WAF included in its request counts, in seconds.

customValues

Unique values identified by the rate-based rule in the request. For string values, the logs print the first 32 characters of the string value. Depending on the key type, these values might be for just a key, such as for HTTP method or query string, or they might be for a key and name, such as for header and the header name.

requestHeadersInserted

The list of headers inserted for custom request handling.

requestId

The ID of the request, which is generated by the underlying host service. For Application Load Balancer, this is the trace ID. For all others, this is the request ID.

responseCodeSent

The response code sent with a custom response.

ruleGroupId

The ID of the rule group. If the rule blocked the request, the ID for ruleGroupID is the same as the ID for terminatingRuleId.

ruleGroupList

The list of rule groups that acted on this request, with match information.

terminatingRule

The rule that terminated the request. If this is present, it contains the following information.

action

The terminating action that AWS WAF applied to the request. This indicates either allow, block, CAPTCHA, or challenge. The CAPTCHA and Challenge actions are terminating when the web request doesn't contain a valid token.

ruleId

The ID of the rule that matched the request.

ruleMatchDetails

Detailed information about the rule that matched the request. This field is only populated for SQL injection and cross-site scripting (XSS) match rule statements. A matching rule might require a match for more than one inspection criteria, so these match details are provided as an array of match criteria.

Any additional information provided for each rule varies according factors such as the rule configuration, rule match type, and details of the match. For example for rules with a CAPTCHA or Challenge action, the captchaResponse or challengeResponse will be listed. If the matching rule is in a rule group and you've overridden its configured rule action, the configured action will be provided in overriddenAction.

terminatingRuleId

The ID of the rule that terminated the request. If nothing terminates the request, the value is Default_Action.

terminatingRuleMatchDetails

Detailed information about the terminating rule that matched the request. A terminating rule has an action that ends the inspection process against a web request. Possible actions for a terminating rule include Allow, Block, CAPTCHA, and Challenge. During the inspection of a web request, at the first rule that matches the request and that has a terminating action, AWS WAF stops the inspection and applies the action. The web request might contain other threats, in addition to the one that's reported in the log for the matching terminating rule.

This is only populated for SQL injection and cross-site scripting (XSS) match rule statements. The matching rule might require a match for more than one inspection criteria, so these match details are provided as an array of match criteria.

terminatingRuleType

The type of rule that terminated the request. Possible values: RATE_BASED, REGULAR, GROUP, and MANAGED_RULE_GROUP.

timestamp

The timestamp in milliseconds.

uri

The URI of the request.

webaclId

The GUID of the web ACL.