Refactoring Current Code to Use IAM Naming Conventions: Half 3 | by Teri Radichel | Cloud Safety | Sep, 2022 | Buff Tech

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ACM.44 Be sure group and coverage names are constant

It is a continuation of my sequence on automating cybersecurity metrics.

In my final put up, I defined how one can create a reusable template and capabilities to create IAM customers. We are able to use that very same concept to create a reusable perform to implement a gaggle, for the reason that solely factor I actually need to range in my group template is the title.

I can begin with a perform to implement a gaggle.

I may create an analogous perform for my group insurance policies with the coverage template file title matching the coverage title:

I’ve all three coverage templates within the Insurance policies subdirectory of my Teams/cfn folder:

Here is the intelligent factor. If I all the time title my CloudFormation coverage templates constantly, I can simply implement the coverage and group with a few additional strains of code. I can calculate the title of the group coverage template file utilizing the group title and implement it from throughout the create_group perform:

So if my group title is IAMAdmins, my coverage file title can be IAMAdminsGroupPolicy.yaml. I am not going to create a generic coverage file as a result of insurance policies are probably the most vital points of CloudSecurity and every of those will doubtless be distinctive. I add Group to every coverage title so I do know the coverage is related to a gaggle after I search for it in my checklist of insurance policies within the AWS console or checklist of CloudFormation stacks.

I made a decision to maintain my group insurance policies in my group folder and this code will stop group insurance policies from being utilized to another useful resource, if that is the one code we use to implement teams and insurance policies. That is one other instance of how a completely automated surroundings will help.

Now my deployment script is fairly easy:

Now I can add new teams in a short time and after I need to discover them within the CloudFormation console I can simply look beneath ‘IAM-Group’.

I can simply discover insurance policies for teams:

I can discover all my IAM admin templates (though the username most likely matches an actual person in a manufacturing surroundings).

Subsequent, I can create a generic perform so as to add a person to a gaggle:

To check a number of customers, I added yet another person named IAMAdmin2 so I can take a look at including a number of customers to a gaggle. Take a look at this put up the place I add customers with related frequent roles.

I simply added a line to IAM/stacks/Customers/

deploy_user "IAMAdmin2" $profile

Now I can strive including two customers to a gaggle in my deployment script:

Test that your group has the related customers after creating this stack:

Some caveats concerning the above deployment script:


The CloudFormation documentation specifies the next for prices:

AWS CloudFormation offers a straightforward and constant approach to mannequin, provision, and handle a set of associated AWS and third-party sources by treating infrastructure as code. You solely pay for what you utilize, with no minimal charges and no upfront commitments required. While you use registry extensions with CloudFormation, you incur controller operation expenses. The controller operations are: CREATE, UPDATE, DELETE, READ, or LIST actions on a useful resource sort, and CREATE, UPDATE, or DELETE actions for a Hook sort. For extra data on controller operations and useful resource suppliers, go to the CloudFormation Documentation.

This isn’t precisely clear. What are you doing “When utilizing registry extensions” imply? Properly, first we will verify what the CloudForamtion registry is…

CloudFormation registration permits you to handle extensions, each private and non-private.

Are we utilizing an extension right here? Is CloudFormation free if we do not use an extension?

Here is one other ingredient for the #AWSWishList ~ to make this documentation clearer.

I do not assume you’re utilizing extensions and CloudFormation was once free. The best approach to reply this query is to verify my billing dashboard to see if I have been charged something for CloudFormation on this account. I can affirm that for what I’m doing thus far on this repository I’m not being charged any CloudFormation charges. I’ve been utilizing this account and CloudFormation for fairly a while. Prior to now CloudFormation was free, I used to be simply checking to see if that had modified.

In the event you’re utilizing some type of extension aside from what I am doing right here, you might not need to rerun all of the stacks simply to replace considered one of them. I am undecided if you’ll be charged for operating if there aren’t any updates. The documentation would not say. I’ve had points previously with unclear AWS documentation that ended up costing far more than preliminary spreadsheet estimates. Hopefully the AWS calculator will provide you with extra correct estimates, but it surely’s all the time a good suggestion to do a proof of idea (POC) and see your invoice earlier than you deploy something at scale.

If I used to be uncertain about pricing and located that I used to be charged for a stack name even when no updates had been required, I might create a approach to deploy solely the particular sources I wished to alter.

Facet-by-side modifications to CloudFormation code and templates

As with pricing, you might need to separate every useful resource to have its personal deployment script when you may have a number of issues in a repository being up to date and do not need to deploy unfinished modifications. I am simply establishing this repository for testing functions and the one individual in the meanwhile is me. In the event you had a growth workforce making a lot of modifications directly, you may need to modify the deployment script.

A change within the validation perform.

Notice that I modified the validation perform in barely to move the perform title.

That manner, after I report an error, I can return the title of the perform that had the lacking parameter worth:

It is all the time a good suggestion to make your error messages as particular as potential to assist individuals rapidly establish the supply of an error.

Subsequent, I added this line to my capabilities to get the title of the present perform:


I then move the perform title to the validate_param perform.

Move parameter values ​​to a comma-separated checklist parameter

One other factor to know is that when passing comma-separated lists to CloudFormation stacks, you should ensure there isn’t a house within the checklist or you’re going to get an error.

So as an alternative of this:

"IAMAdminUser, IAMAdminUser2"

Move this:


Warnings about including and eradicating customers from teams

I did not take a look at eradicating the IAMAdmin2 person from the group right here, however I assume eradicating and redeploying would replace the group. What occurs if somebody removes a person from the group outdoors of the CloudFormation template? I assume redeploying will re-add the person to the group.

What if somebody manually provides a person to the group? Are you influenced by this stack including particular customers to the group?

What if we need to generate all of the customers added to the group and use that? Subsequent, we have to guarantee that the one manner the pool might be up to date is thru this automation stack.

As for IAM roles…

Good! Now we will very simply create new customers, teams and group insurance policies. We have now yet another useful resource to see if we will refactor: IAM roles. Comply with me or join the e-mail checklist to obtain the subsequent put up.

Teri Radichel

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