How do I obtain temporary AWS credentials for an unauthenticated role in PowerShell using a Cognito IdentityPool

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I was writing a PowerShell script that needed to access an AWS S3 bucket using an unauthenticated role via Cognito and had trouble finding much documentation. All of the documentation I was able to find for the AWS PowerShell SDK discussed storing your AccessKey and SecretKey but never how to get those credentials using Cognito when you aren't using a user pool.
Feb 16, 2023 in AWS by sarit
• 1,830 points
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1 answer to this question.

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To obtain temporary AWS credentials for an unauthenticated role in PowerShell using a Cognito IdentityPool, you can use the AWS PowerShell SDK and the Get-CognitoIdentity cmdlet. Here are the steps:

  1. Install the AWS PowerShell SDK if you haven't already. You can do this by running the following command in PowerShell:

    
    
    

    Install-Module -Name AWSPowerShell.NetCore

  2. Create an IdentityPool in the AWS Console and note its ID.

  3. Set up an IAM Role with permissions to access the AWS resources you need, and make sure to enable the "Allow access from unauthenticated identities" option.

  4. In your PowerShell script, use the following code to get temporary credentials:

    # Import the AWS PowerShell module
    Import-Module AWSPowerShell

    # Set up the parameters for the Get-CognitoIdentity cmdlet
    $IdentityPoolId = "<your IdentityPool ID>"
    $AccountId = "<your AWS Account ID>"
    $RoleArn = "<your IAM Role ARN>"

    # Get a new Cognito identity ID
    $IdentityId = (Get-CognitoIdentity -IdentityPoolId $IdentityPoolId).IdentityId

    # Get temporary AWS credentials for the unauthenticated role
    $Credentials = Get-CognitoIdentityCredentials -IdentityId $IdentityId -AccountId $AccountId -RoleArn $RoleArn

    # Use the credentials to access the AWS resource (e.g. S3 bucket)
    Get-S3Object -BucketName "<your S3 bucket name>" -Key "<your object key>" -Credential $Credentials

    Replace the values for $IdentityPoolId, $AccountId, $RoleArn, <your S3 bucket name>, and <your object key> with your own values.

  5. Run the script and you should be able to access your AWS resource using temporary credentials obtained through Cognito.

Note that the temporary credentials obtained through Cognito have an expiration time, so you will need to refresh them periodically to continue accessing your AWS resource.

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answered Feb 17, 2023 by anonymous

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