Use DecodeAuthorizationMessage with an AWS SDK or CLI - AWS SDK Code Examples

There are more AWS SDK examples available in the AWS Doc SDK Examples GitHub repo.

Use DecodeAuthorizationMessage with an AWS SDK or CLI

The following code examples show how to use DecodeAuthorizationMessage.

CLI
AWS CLI

To decode an encoded authorization message returned in response to a request

The following decode-authorization-message example decodes additional information about the authorization status of a request from an encoded message returned in response to an Amazon Web Services request.

aws sts decode-authorization-message \
    --encoded-message EXAMPLEWodyRNrtlQARDip-eTA6i6DrlUhHhPQrLWB_lAbl5pAKxl9mPDLexYcGBreyIKQC1BGBIpBKr3dFDkwqeO7e2NMk5j_hmzAiChJN-8oy3EwiCjkUW5fdRNjcRvscGlUo_MhqHqHpR-Ojau7BMjOTWwOtHPhV_Zaz87yENdipr745EjQwRd5LaoL3vN8_5ZfA9UiBMKDgVh1gjqZJFUiQoubv78V1RbHNYnK44ElGKmUWYa020I1y6TNS9LXoNmc62GzkfGvoPGhD13br5tXEOo1rAm3vsPewRDFNkYL-4_1MWWezhRNEpqvXBDXLI9xEux7YYkRtjd45NJLFzZynBUubV8NHOevVuighd1Mvz3OiA-1_oPSe4TBtjfN9s7kjU1z70WpVbUgrLVp1xXTK1rf9Ea7t8shPd-3VzKhjS5tLrweFxNOKwV2GtT76B_fRp8HTYz-pOu3FZjwYStfvTb3GHs3-6rLribGO9jZOktkfE6vqxlFzLyeDr4P2ihC1wty9tArCvvGzIAUNmARQJ2VVWPxioqgoqCzMaDMZEO7wkku7QeakEVZdf00qlNLMmcaVZb1UPNqD-JWP5pwe_mAyqh0NLw-r1S56YC_90onj9A80sNrHlI-tIiNd7tgNTYzDuPQYD2FMDBnp82V9eVmYGtPp5NIeSpuf3fOHanFuBZgENxZQZ2dlH3xJGMTtYayzZrRXjiq_SfX9zeBbpCvrD-0AJK477RM84vmtCrsUpJgx-FaoPIb8LmmKVBLpIB0iFhU9sEHPqKHVPi6jdxXqKaZaFGvYVmVOiuQdNQKuyk0p067POFrZECLjjOtNPBOZCcuEKEXAMPLE

Output:

{
    "DecodedMessage": "{\"allowed\":false,\"explicitDeny\":true,\"matchedStatements\":{\"items\":[{\"statementId\":\"VisualEditor0\",\"effect\":\"DENY\",\"principals\":{\"items\":[{\"value\":\"AROA123456789EXAMPLE\"}]},\"principalGroups\":{\"items\":[]},\"actions\":{\"items\":[{\"value\":\"ec2:RunInstances\"}]},\"resources\":{\"items\":[{\"value\":\"*\"}]},\"conditions\":{\"items\":[]}}]},\"failures\":{\"items\":[]},\"context\":{\"principal\":{\"id\":\"AROA123456789EXAMPLE:Ana\",\"arn\":\"arn:aws:sts::111122223333:assumed-role/Developer/Ana\"},\"action\":\"RunInstances\",\"resource\":\"arn:aws:ec2:us-east-1:111122223333:instance/*\",\"conditions\":{\"items\":[{\"key\":\"ec2:MetadataHttpPutResponseHopLimit\",\"values\":{\"items\":[{\"value\":\"2\"}]}},{\"key\":\"ec2:InstanceMarketType\",\"values\":{\"items\":[{\"value\":\"on-demand\"}]}},{\"key\":\"aws:Resource\",\"values\":{\"items\":[{\"value\":\"instance/*\"}]}},{\"key\":\"aws:Account\",\"values\":{\"items\":[{\"value\":\"111122223333\"}]}},{\"key\":\"ec2:AvailabilityZone\",\"values\":{\"items\":[{\"value\":\"us-east-1f\"}]}},{\"key\":\"ec2:ebsOptimized\",\"values\":{\"items\":[{\"value\":\"false\"}]}},{\"key\":\"ec2:IsLaunchTemplateResource\",\"values\":{\"items\":[{\"value\":\"false\"}]}},{\"key\":\"ec2:InstanceType\",\"values\":{\"items\":[{\"value\":\"t2.micro\"}]}},{\"key\":\"ec2:RootDeviceType\",\"values\":{\"items\":[{\"value\":\"ebs\"}]}},{\"key\":\"aws:Region\",\"values\":{\"items\":[{\"value\":\"us-east-1\"}]}},{\"key\":\"ec2:MetadataHttpEndpoint\",\"values\":{\"items\":[{\"value\":\"enabled\"}]}},{\"key\":\"aws:Service\",\"values\":{\"items\":[{\"value\":\"ec2\"}]}},{\"key\":\"ec2:InstanceID\",\"values\":{\"items\":[{\"value\":\"*\"}]}},{\"key\":\"ec2:MetadataHttpTokens\",\"values\":{\"items\":[{\"value\":\"required\"}]}},{\"key\":\"aws:Type\",\"values\":{\"items\":[{\"value\":\"instance\"}]}},{\"key\":\"ec2:Tenancy\",\"values\":{\"items\":[{\"value\":\"default\"}]}},{\"key\":\"ec2:Region\",\"values\":{\"items\":[{\"value\":\"us-east-1\"}]}},{\"key\":\"aws:ARN\",\"values\":{\"items\":[{\"value\":\"arn:aws:ec2:us-east-1:111122223333:instance/*\"}]}}]}}}"
}

For more information, see Policy evaluation logic in the AWS IAM User Guide.

PowerShell
Tools for PowerShell

Example 1: Decodes the additional information contained in the supplied encoded message content that was returned in response to a request. The additional information is encoded because details of the authorization status can constitute privileged information that the user who requested the action should not see.

Convert-STSAuthorizationMessage -EncodedMessage "...encoded message..."