Modifying A Position CloudFormation Template to Go in an ARN to Assume the Position | by Teri Radichel | Cloud Safety | Aug, 2022

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ACM.30 Permit an IAM administrator to run IAM-related batch jobs

This can be a continuation of my sequence on automating cybersecurity metrics.

Initially, we created a batch admin consumer who was allowed to imagine the roles to run our batch jobs. On this submit, we need to enable the IAM consumer we created earlier to imagine the batch job position that requires IAM permissions.

An AWS CLI profile with EC2 occasion metadata credentials

Earlier than we modify our batch job operate template, let’s have a look at what occurs after we attempt to take over the batch job operate utilizing the operate assigned to an EC2 occasion.

As an example you need to configure an AWS CLI profile to imagine the batch job position. Discover the ARN of the position we created for this batch job.

Navigate to IAM. Click on Options. Seek for “Lot”:

Click on BatchRoleDeployBatchJobCredentials that we created for this batch job that we’re utilizing to deploy our batch job supervisor credentials.

As proven in a earlier submit, copy the ARN by clicking the copy icon.

Add the next to your ~/.aws/config file:

Save the file. hit the exhaust [esc] key and kind:

:wq!

Within the above setup, we’re making a CLI profile referred to as “batch” and operating instructions with the required position.

We want some credentials to imagine this position and we’re telling the CLI to make use of the EC2 occasion credentials within the second line the place credential_source is Ec2InstanceMetadata.

I defined what EC2 metadata is and its relationship to the permissions granted to your EC2 occasion in a earlier submit:

I assume you’re following my directions above to run the scripts on an AWS occasion with an assigned IAM position.

Our batch job position has KMS permissions. Take a look at your CLI profile by operating the command to describe KMS key we created in a earlier submit. We allowed this consumer to carry out that motion in our key coverage. We will discover the CLI documentation for that command:

We have to go a key id:

You will discover the important thing ID by navigating to KMS and on the lookout for your key ID there, or by wanting on the outcomes of your CloudFormation template:

Observe that I eliminated my key id within the screenshot above, however you will notice one within the Worth column. We will use that id to run our CLI command. Change [keyid] together with your identification key within the following command:

aws kms describe-key --key-id [your key id] --profile batch

What occurs subsequent? You might be prone to get an error when you have adopted my directions to the letter.

An error occurred (AccessDenied) when calling the AssumeRole operation: Person: arn:aws:sts::xxxxxxxxxx:assumed-role/xxxxxxx/i-xxxxxxxxx will not be approved to carry out: sts:AssumeRole on useful resource: arn:aws:iam::xxxxxxxxxxxxx:position/BatchRoleDeployBatchJobCredentials

The rationale we’re getting this error is as a result of we do not enable the consumer or position we configured on our EC2 occasion to take over the batch job position (BatchRoleDeployBatchjobCredentials).

Catch-22 to create credentials with a job that requires MFA to imagine

Let’s evaluate our belief coverage to see what we did. Navigate to the IAM dashboard within the AWS console. Click on on Roles and the position we are attempting to imagine. Click on on the “Belief Relationships” tab.

Keep in mind that we’re permitting our BatchJobAdmin to take over our batch job roles, however solely when MFA is current.

So perhaps we should always add our batch job credentials to the EC2 occasion so we will assume this position. However wait. The credentials for that consumer is what we’re making an attempt to create.

The issue is that we won’t use the consumer from the batch job to create our credentials as a result of that is the consumer we’re making an attempt to create credentials for. Or in different phrases, permissions to deploy credentials can’t rely on the credentials we are attempting to deploy. Our catch 22.

Since I by no means need to expose the batch job’s admin credentials to a human, I will have to make use of a distinct set of credentials to create them. We’ll use the IAM consumer to carry out this IAM-related job, ultimately by means of a batch job, however for now we need to take a look at that we will implement the credentials.

Modifying our position template to permit totally different ARNs to imagine a job

We have now a few choices to permit totally different identities to take over our batch job roles:

  • We might modify the batch job position template to go the assumed position principal when it’s deployed.
  • We might create a brand new CloudFormation position template particularly for this job or IAM directors.

I began with choice two as a result of I believed it would assist keep away from batch job misconfigurations, however went again to choice one to maintain issues easy. Nonetheless: we’re not completed with this template. It has some safety points which I’ll repair within the subsequent submit.

Modify our current batch job position to make it extra versatile. Check out batch_job_role.

That is the place I must assign a distinct ARN, apart from the batch job supervisor.

I will change this with a parameter to go an ARN and assign this ARN to the handed parameter:

I will additionally must edit the deployment.sh script within the batch_job_role folder to go an argument for use for the assumed position parameter:

I may even should go the position to imagine from the deployment.sh script within the job folder:

Navigate to your batch job folder:

jobs/DeployBatchJobCredentials/

Redeploy your batch job operate and go within the ARN for the IAM consumer we created in a earlier submit:

deploy.sh [assume-role-arn-here]

For those who get this error, it’s essential delete the coverage stack first since you are utilizing the credentials from the position stack. Then run deployment.sh once more.

For those who’re having issues the place the output names are lacking job names, be certain that your script is appropriately passing the job title, not an empty string. For those who’re simply utilizing my remaining GitHub scripts once they’re obtainable, you should not have that downside.

Swap again to the batch job position within the IAM console and confirm that the coverage within the Belief Relationships tab has modified as anticipated.

All the time confirm that your code has labored. Once I first tried this code, I acquired no errors, however once I checked the position belief coverage, it was unsuitable. I forgot a change and subsequently the template by no means up to date the position despite the fact that the template indicated a profitable deployment.

Give the IAM administrator permission to imagine the position

For the needs of this framework, I’m going to simulate an setting the place the pc that deploys the software program will not be the identical pc that deploys the KMS keys. I’ve already created a separate IAM administrator.

Redeploy the batch job position and go within the IAM consumer ARN so you’ll be able to seize the position, with MFA.

Create a job profile for the IAM consumer that requires MFA

Observe the steps within the earlier weblog submit the place I defined how you can arrange an IAM profile that requires MFA. Create an iam and iamuser profile akin to the kms and kmsuser profiles within the submit beneath. Use the batch job operate in configuration as a substitute of the KMS administrator operate in publishing.

Strive the MFA profile

Now run the KMS describe key command once more, however embody the brand new profile you configured. Now it ought to work.

We must always now be capable of use our iam CLI profile with the batch job position to create credentials for our batch job consumer.

Observe for updates.

Teri Radichel

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Modifying A Role CloudFormation Template to Pass in an ARN to Assume the Role | by Teri Radichel | Cloud Security | Aug, 2022

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