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Syncs iam roles

Project description

IAM syncr

A tool for keeping iam roles synced.


Just use pip:

pip install iam_syncr


You make a folder for each amazon account you have and you put in there files that define the roles you want to define in that account.

You then run:

iam_syncr <folder>

It will find the roles you have defined and ensure they exist and only have the policies you have defined.

It will leave alone other roles in your account.

Note that for the roles you have defined, it will remove any policies that don’t match what you have.

It is up to you to put the necessary amazon credentials in your environment via AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY.



The script will look for an accounts.yaml in the directory above the folder you specified. This is expected to be a mapping of {account_name:account_id} where account_id is the 12 digit id without hyphens for each amazon account.

The script will use these values to both check that the credentials you supplied is for the account you are syncing and will also use the values if you specify you account names in the policies.

Any yaml file in the specified folder
Currently only supports files with a “roles” or “remove_roles” definition in it.

Yaml Configuration

The yaml looks something like:


      description: <optional>

      make_instance_profile: <boolean saying whether to make an instance profile with this role in it>

      allow_to_assume_me: [<assume_role_principle]
      disallow_to_assume_me: [<assume_role_principle]

      permission: [<permission_statements>]
      deny_permission: [<permission_statemnt> where "Effect" is set to "Deny"]
      allow_permission: [<permission_statemnt> where "Effect" is set to "Allow"]

   - <role_name>
   - <role_name>
   - ...

Where <assume_role_statement> can be:

{service: ec2}

Sets the principle to {"Service": ""}

You’ll want to do this if you want to use metdata credentials on an ec2 box


See below, it specifies an iam resource

Basically allows the iam role specified to call assume role to be this role.

{federated: <string>}
Sets the principle to {"Federated": <string>}

Anything in the dictionary starting with an upper case character is included as is in the principle.

Also, the difference between allow_to_assume_me and disallow_to_assume_me is one sets Principle in the trust document, whereas the other sets NotPrinciple.

And <permission_statement> can be:

{"action": <action>, resource: <resource>, "allow":<True|False>}

Allows <action> for specified <resource> (string or list of strings)

“allow” will override any default allow or “Effect” you specify

And anything starting with an upper case character is included in the statement as is.

Where action and resource can be notaction and notresource.

And <resource> can be:

A single string
Placed in the policy as a list of that one string
A list of <resource>
Placed in the policy with each <resource> expanded
See below, it specifies an iam resource
{"s3": <s3_specifier>}
{"s3": [<s3_specifier>, <s3_specifier>, ...]}
[“arn:aws:s3:::<s3_specifier>”, “arn:aws:s3:::<s3_specifier>”, …]

Where <iam_specifer> can be:

arn for the role/user this policy is being given to
{"iam":<specifier>, "account":<account>"}


Where account is retrieved from our accounts dictionary from accounts.yaml

The Future

In order of importance:

  • Ordering so roles are created before roles are modified
  • Add a –noop option
  • More Tests
  • Support editing users and groups

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Filename, size & hash SHA256 hash help File type Python version Upload date
iam_syncr- (12.0 kB) Copy SHA256 hash SHA256 Source None Sep 1, 2014

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