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Security Modules 0.72.0Last updated in version 0.69.2

IAM Users

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This is a Terraform module you can use to create and manage IAM users as code.

How do you generate passwords and access keys with this module?​

This module can optionally create a password for AWS Web Console access and/or access keys for programmatic access for each IAM user if you set create_login_profile and/or create_access_keys to true for that IAM user, respectively.

To avoid having these secrets stored in plain text in Terraform state, this module will only generate the password or access keys if you specify the pgp_key param for that user. This param can contain either the base-64 encoded PGP public key for that user or the user's Keybase username in the format keybase:<USERNAME>.

We recommend using Keybase, as it makes it easier to manage PGP keys. Have each user at your company:

  1. Install the Keybase app.
  2. Claim a Keybase username.
  3. Use the Keybase app to create a PGP key and add it to their profile.
  4. Send you their username.

Once you have their user name, set pgp_key = "keybase:<USERNAME>" and create_login_profile and/or create_access_keys to true for that user, and this module will generate the password and/or access keys, and export them in the output variables user_passwords and user_access_keys. The output will look something like this:

user_access_keys = {
  "alice" = {
    "access_key_id" = "AKIARIUU2OIYE2APGOYK"
    "secret_access_key" = "wcBMA7E6Kn/t1YPfAQgAjLvUWUES/GeLHr/=="
  }
}
user_passwords = {
  "bob" = "wcBMA7E6Kn/t1YPfAQgAdByWFftehuD3uw="
}

You can see that Alice's secret_access_key and Bob's password are encrypted, so you can safely mail those credentials to each user.

How do I use PGP keys directly?​

The module also supports using PGP keys directly, without keybase. To use a raw PGP key, export the public key in binary format and base64 encode it:

# Set KEYID to the ID of the PGP key you would like to use for encrypting
gpg --export $KEYID | base64

You can then set the pgp_key field to the resulting string.

How do you decrypt the generated passwords and access keys?​

To decrypt a user's password or access keys, that user can decrypt them on the command-line as follows:

echo "<SECRET>" | base64 --decode | keybase pgp decrypt

Note that this only works if the user has the private key for their PGP key on their local computer (which they will if they used the Keybase app to create the PGP key in the first place).

If you used a raw PGP key, you can use the following command instead:

# Set KEYID to the ID of the PGP key you used for encrypting
echo "<SECRET>" | base64 --decode | gpg -d $KEYID

How do you delete users?​

Under the hood, this module uses the aws_iam_user resource, which only allows you to delete an IAM user by doing the following multi-step process:

  1. Set the force_destroy parameter to true on that user. Example:

    module "iam_users" {
      source = "git::git@github.com:gruntwork-io/terraform-aws-security.git//modules/iam-users?ref=v0.53.2"

      users = {
        # Set force_destroy to true on the user you want to delete
        "example-user-to-delete" = {
          force_destroy = true
        }
        
        "some-other-user"  = {}
        "yet-another-user" = {}
      }
    }

  2. Run apply.

  3. Remove the user you wish to delete from the users input variable. Following on the previous example:

    module "iam_users" {
      source = "git::git@github.com:gruntwork-io/terraform-aws-security.git//modules/iam-users?ref=v0.53.2"

      users = {
        # Note that example-user-to-delete has been removed
        
        "some-other-user"  = {}
        "yet-another-user" = {}
      }
    }

  4. Run apply again.

Sample Usage​

main.tf

# ------------------------------------------------------------------------------------------------------
# DEPLOY GRUNTWORK'S IAM-USERS MODULE
# ------------------------------------------------------------------------------------------------------

module "iam_users" {

  source = "git::git@github.com:gruntwork-io/terraform-aws-security.git//modules/iam-users?ref=v0.72.0"

  # ----------------------------------------------------------------------------------------------------
  # REQUIRED VARIABLES
  # ----------------------------------------------------------------------------------------------------

  # A map of users to create. The keys are the user names and the values are an
  # object with the optional keys 'groups' (a list of IAM groups to add the user
  # to), 'tags' (a map of tags to apply to the user), 'pgp_key' (either a
  # base-64 encoded PGP public key, or a keybase username in the form
  # keybase:username, used to encrypt the user's credentials; required if
  # create_login_profile or create_access_keys is true), 'create_login_profile'
  # (if set to true, create a password to login to the AWS Web Console),
  # 'create_access_keys' (if set to true, create access keys for the user),
  # 'path' (the path), 'permissions_boundary' (the ARN of the policy that is
  # used to set the permissions boundary for the user), and 'ssh_public_key'
  # (the public part of the user's SSH key that will be added to their security
  # credentials for use with `ssh-grunt`).
  users = <any>

  # ----------------------------------------------------------------------------------------------------
  # OPTIONAL VARIABLES
  # ----------------------------------------------------------------------------------------------------

  # Create a dependency between the resources in this module to the interpolated
  # values in this list (and thus the source resources). In other words, the
  # resources in this module will now depend on the resources backing the values
  # in this list such that those resources need to be created before the
  # resources in this module, and the resources in this module need to be
  # destroyed before the resources in the list.
  dependencies = []

  # When destroying this user, destroy even if it has non-Terraform-managed IAM
  # access keys, login profile, or MFA devices. Without force_destroy a user
  # with non-Terraform-managed access keys and login profile will fail to be
  # destroyed.
  force_destroy = false

  # The length for the generated AWS Web Console password. Only used for users
  # with create_login_profile set to true.
  password_length = 20

  # Force the user to reset their password on initial login. Only used for users
  # with create_login_profile set to true.
  password_reset_required = true

}


Reference​

Required​

usersanyrequired

A map of users to create. The keys are the user names and the values are an object with the optional keys 'groups' (a list of IAM groups to add the user to), 'tags' (a map of tags to apply to the user), 'pgp_key' (either a base-64 encoded PGP public key, or a keybase username in the form keybase:username, used to encrypt the user's credentials; required if create_login_profile or create_access_keys is true), 'create_login_profile' (if set to true, create a password to login to the AWS Web Console), 'create_access_keys' (if set to true, create access keys for the user), 'path' (the path), 'permissions_boundary' (the ARN of the policy that is used to set the permissions boundary for the user), and 'ssh_public_key' (the public part of the user's SSH key that will be added to their security credentials for use with ssh-grunt).

Any types represent complex values of variable type. For details, please consult `variables.tf` in the source repo.
Example
   default = {
     alice = {
       groups = ["user-self-mgmt", "developers", "ssh-sudo-users"]
     }
  
     bob = {
       path   = "/"
       groups = ["user-self-mgmt", "ops", "admins"]
       tags   = {
         foo = "bar"
       }
     }
  
     carol = {
       groups               = ["user-self-mgmt", "developers", "ssh-users"]
       pgp_key              = "keybase:carol_on_keybase"
       ssh_public_key       = "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQD3F6tyPEFEzV0LX3X8BsXdMsQz1x2cEikKDEY0aIj41qgxMCP/iteneqXSIFZBp5vizPvaoIR3Um9xK7PGoW8giupGn+EPuxIA4cDM4vzOqOkiMPhz5XK0whEjkVzTo4+S0puvDZuwIsdiW9mxhJc7tgBNL0cYlWSYVkz4G/fslNfRPW5mYAM49f4fhtxPb5ok4Q2Lg9dPKVHO/Bgeu5woMc7RY0p1ej6D4CKFE6lymSDJpW0YHX/wqE9+cfEauh7xZcG0q9t2ta6F6fmX0agvpFyZo8aFbXeUBr7osSCJNgvavWbM/06niWrOvYX2xwWdhXmXSrbX8ZbabVohBK41 carol@example.com"
       create_login_profile = true
       create_access_keys   = true
     }
  
     dan = {
       json_policies = {
         EC2FullAccess = <<-EOF
         {
             "Version": "2012-10-17",
             "Statement": [
                 {
                     "Sid": "AllowEC2FullAccess",
                     "Effect": "Allow",
                     "Action": [
                         "ec2:*"
                     ],
                     "Resource": "*"
                 }
             ]
         }
         EOF
         billing  = module.iam_policies.billing
       }
       inline_iam_policies = {
         AdminAccess = {
           actions   = ["*:*"]
           resources = ["*"]
           effect    = "Allow"
           force_mfa = true
         }
       }
     }
   }

Details

   Ideally, this would be a map of (string, object), but object does not support optional properties, and we want
   users to be able to specify, say, tags for some users, but not for others. We can't use a map(any) either, as that
   would require the values to all have the same type, and due to optional parameters, that wouldn't work either. So,
   we have to lamely fall back to any.

Details

   Each entry in the map supports the following attributes:
  
   OPTIONAL
   - groups                             list(string)    : A list of IAM groups to add the user to. Defaults to null.
   - customer_managed_policy_names      list(string)    : A list of IAM AWS Customer Managed policy names to attach to the IAM
                                                          user. Defaults to null.
   - aws_managed_policy_names           list(string)    : A list of IAM AWS Managed Policy names to attach to the group.
                                                          Defaults to null.
   - inline_iam_policies                map(PolicyDoc)  : Map of names to IAM policy documents to attach as inline policies
                                                          on the user. See below for the schema of each object. Defaults to null.
   - json_policies                      map(string)     : Map of names to JSON formatted policy documents to attach to the user.
                                                          Defaults to null.
   - create_login_profile               bool            : When true, create a password to login to the AWS Web Console.
                                                          Defaults to false. The resulting secret is encrypted using the PGP
                                                          key specified in the pgp_key attribute.
   - create_access_keys                 bool            : When true, create AWS Access Key pair for the user.  Defaults to
                                                          false. The resulting secret is encrypted using the PGP key specified
                                                          in the pgp_key attribute.
   - path                               string          : The path for the IAM user.
   - pgp_key                            string          : Used to encrypt the user's credentials. Required if create_login_profile or
                                                          create_access_keys attributes is true. This is either a base64
                                                          encoded PGP public key, or a keybase username in the form
                                                          'keybase:username'.
   - permissions_boundary               string          : The ARN of the policy that is used to set the permissions boundary
                                                          for the user. Defaults to null.
   - ssh_public_key                     string          : The public part of the user's SSH key that will be added to their
                                                          security credentials for use with ssh-grunt. Defaults to null.
   - store_access_keys_in_secrets_mgr   bool            : if set to true, store the user's access keys in AWS Secrets Manager. This should
                                                          only be set to `true` for machine users. Secrets Manager
                                                          allows multiple team members to access the data, whereas a
                                                          PGP key is usually only accessible to one team member. The
                                                          secret id will be equal to the IAM username for which the
                                                          secret is provisioned. **WARNING**: This will cause the
                                                          user's access keys to be stored in plain text in Terraform
                                                          state. The Secrets Manager secret value will be a JSON
                                                          object with the keys `accessKey` and `secretKey` similar to
                                                          the following (`ACCESS_KEY_HERE` and `SECRET_KEY_HERE` will
                                                          be replaced with the real access key and secret key for
                                                          the user):
                                                              {
                                                                  "accessKey": "ACCESS_KEY_HERE",
                                                                  "secretKey": "SECRET_KEY_HERE"
                                                              }
   - tags                               map(string)     : A map of tags to apply to the user, where the keys are tag keys and
                                                          values are tag values. Defaults to {}.
  
   Structure of PolicyDoc object:
   - resources  list(string)  : The list of resources that the policy applies to.
   - actions    list(string)  : The list of AWS actions (e.g., ec2:DescribeImages or ec2:*) that applies to the policy.
   - effect     string        : Whether the IAM policy is specifying actions the user is allowed to do, or denied to
                                do. Must be "Allow" or "Deny".
   - force_mfa  bool          : Whether or not the MFA is only applied if the session is MFA verified.

Optional​

dependencieslist(string)optional

Create a dependency between the resources in this module to the interpolated values in this list (and thus the source resources). In other words, the resources in this module will now depend on the resources backing the values in this list such that those resources need to be created before the resources in this module, and the resources in this module need to be destroyed before the resources in the list.

[]
force_destroybooloptional

When destroying this user, destroy even if it has non-Terraform-managed IAM access keys, login profile, or MFA devices. Without force_destroy a user with non-Terraform-managed access keys and login profile will fail to be destroyed.

false
password_lengthnumberoptional

The length for the generated AWS Web Console password. Only used for users with create_login_profile set to true.

20

Force the user to reset their password on initial login. Only used for users with create_login_profile set to true.

true