[ aws . cloudtrail ]



Validates CloudTrail logs for a given period of time.

This command uses the digest files delivered to your S3 bucket to perform the validation.

The AWS CLI allows you to detect the following types of changes:

  • Modification or deletion of CloudTrail log files.
  • Modification or deletion of CloudTrail digest files.

To validate log files with the AWS CLI, the following preconditions must be met:

  • You must have online connectivity to AWS.
  • You must have read access to the S3 bucket that contains the digest and log files.
  • The digest and log files must not have been moved from the original S3 location where CloudTrail delivered them.
  • For organization trails you must have access to describe-organization to validate digest files

When you disable Log File Validation, the chain of digest files is broken after one hour. CloudTrail will not digest log files that were delivered during a period in which the Log File Validation feature was disabled. For example, if you enable Log File Validation on January 1, disable it on January 2, and re-enable it on January 10, digest files will not be created for the log files delivered from January 3 to January 9. The same applies whenever you stop CloudTrail logging or delete a trail.


Log files that have been downloaded to local disk cannot be validated with the AWS CLI. The CLI will download all log files each time this command is executed.


This command requires that the role executing the command has permission to call ListObjects, GetObject, and GetBucketLocation for each bucket referenced by the trail.


--trail-arn <value>
--start-time <value>
[--end-time <value>]
[--s3-bucket <value>]
[--s3-prefix <value>]
[--account-id <value>]
[--endpoint-url <value>]
[--output <value>]
[--query <value>]
[--profile <value>]
[--region <value>]
[--version <value>]
[--color <value>]
[--ca-bundle <value>]
[--cli-read-timeout <value>]
[--cli-connect-timeout <value>]
[--cli-binary-format <value>]


--trail-arn (string) Specifies the ARN of the trail to be validated

--start-time (string) Specifies that log files delivered on or after the specified UTC timestamp value will be validated. Example: “2015-01-08T05:21:42Z”.

--end-time (string) Optionally specifies that log files delivered on or before the specified UTC timestamp value will be validated. The default value is the current time. Example: “2015-01-08T12:31:41Z”.

--s3-bucket (string) Optionally specifies the S3 bucket where the digest files are stored. If a bucket name is not specified, the CLI will retrieve it by calling describe_trails

--s3-prefix (string) Optionally specifies the optional S3 prefix where the digest files are stored. If not specified, the CLI will determine the prefix automatically by calling describe_trails.

--account-id (string) Optionally specifies the account for validating logs. This parameter is needed for organization trails for validating logs for specific account inside an organization

--verbose (boolean) Display verbose log validation information

Global Options

--debug (boolean)

Turn on debug logging.

--endpoint-url (string)

Override command’s default URL with the given URL.

--no-verify-ssl (boolean)

By default, the AWS CLI uses SSL when communicating with AWS services. For each SSL connection, the AWS CLI will verify SSL certificates. This option overrides the default behavior of verifying SSL certificates.

--no-paginate (boolean)

Disable automatic pagination.

--output (string)

The formatting style for command output.

  • json
  • text
  • table
  • yaml
  • yaml-stream

--query (string)

A JMESPath query to use in filtering the response data.

--profile (string)

Use a specific profile from your credential file.

--region (string)

The region to use. Overrides config/env settings.

--version (string)

Display the version of this tool.

--color (string)

Turn on/off color output.

  • on
  • off
  • auto

--no-sign-request (boolean)

Do not sign requests. Credentials will not be loaded if this argument is provided.

--ca-bundle (string)

The CA certificate bundle to use when verifying SSL certificates. Overrides config/env settings.

--cli-read-timeout (int)

The maximum socket read time in seconds. If the value is set to 0, the socket read will be blocking and not timeout. The default value is 60 seconds.

--cli-connect-timeout (int)

The maximum socket connect time in seconds. If the value is set to 0, the socket connect will be blocking and not timeout. The default value is 60 seconds.

--cli-binary-format (string)

The formatting style to be used for binary blobs. The default format is base64. The base64 format expects binary blobs to be provided as a base64 encoded string. The raw-in-base64-out format preserves compatibility with AWS CLI V1 behavior and binary values must be passed literally. When providing contents from a file that map to a binary blob fileb:// will always be treated as binary and use the file contents directly regardless of the cli-binary-format setting. When using file:// the file contents will need to properly formatted for the configured cli-binary-format.

  • base64
  • raw-in-base64-out

--no-cli-pager (boolean)

Disable cli pager for output.

--cli-auto-prompt (boolean)

Automatically prompt for CLI input parameters.

--no-cli-auto-prompt (boolean)

Disable automatically prompt for CLI input parameters.



To use the following examples, you must have the AWS CLI installed and configured. See the Getting started guide in the AWS CLI User Guide for more information.

Unless otherwise stated, all examples have unix-like quotation rules. These examples will need to be adapted to your terminal’s quoting rules. See Using quotation marks with strings in the AWS CLI User Guide .

To validate a log file

The following validate-logs command validates the logs for Trail1:

aws cloudtrail validate-logs --trail-arn arn:aws:cloudtrail:us-east-1:123456789012:trail/Trail1 --start-time 20160129T19:00:00Z


Validating log files for trail arn:aws:cloudtrail:us-east-1:123456789012:trail/Trail1 between 2016-01-29T19:00:00Z and 2016-01-29T22:15:43Z
Results requested for 2016-01-29T19:00:00Z to 2016-01-29T22:15:43Z
Results found for 2016-01-29T19:24:57Z to 2016-01-29T21:24:57Z:
3/3 digest files valid
15/15 log files valid