terraform-aws-cognito-user-pool

A Terraform 0.12 module for deploying and managing Cognito User Pools on Amazon Web Services (AWS).

• Module Features
• Getting Started
• Module Argument Reference
  • Top-level Arguments
    • Module Configuration
    • Cognito User Pool
    • Cognito User Pool Domain
    • Cognito User Pool Clients
    • Cognito User Pool Clients Default Values
• Module Attributes Reference
• External Documentation
• Module Versioning
  • Backwards compatibility in 0.0.z and 0.y.z version
• About Mineiros
• Reporting Issues
• Contributing
• Makefile Targets
• License

Module Features

In contrast to the plain cognito_user_pool resource this module has a more secure level of default settings.

While all settings can be customized as needed, best practices are pre-configured.

• Default Security Settings: Per default, only administrators are allowed to create user profiles by setting allow_admin_create_user_only to true. This module comes with a strong default password policy.

Standard Cognito Features: Create a Cognito User Pool with pre-configured best practices. Create Cognito User Pool Clients. Create a Cognito User Pool Domain.

• Features not yet implemented: cognito_user_group cognito_resource_server

Getting Started

Most basic usage just setting required arguments:

module "terraform-aws-cognito-user-pool" {
  source  = "mineiros-io/cognito-user-pool/aws"
  version = "~> 0.1.4"

  name = "application-userpool"
}

Advanced usage as found in examples/complete/main.tf setting all required and optional arguments to their default values.

Module Argument Reference

See variables.tf and examples/ for details and use-cases.

Top-level Arguments

Module Configuration

• module_enabled: (Optional bool)

  Specifies whether resources in the module will be created. Default is true.

• module_depends_on: (Optional list(any))

  A list of dependencies. Any object can be assigned to this list to define a hidden external dependency. Default is [].

Cognito User Pool

• name: (Required string, Forces new resource)

  The name of the user pool.

• advanced_security_mode: (Optional string)

  The mode for advanced security, must be one of OFF, AUDIT or ENFORCED. Additional pricing applies for Amazon Cognito advanced security features. For details see https://aws.amazon.com/cognito/pricing/. Default is OFF.

• alias_attributes: (Optional set(string))

  Attributes supported as an alias for this user pool. Possible values: phone_number, email, or preferred_username. Conflicts with username_attributes. Default is ["email", "preferred_username",] if username_attributes is not set.

• username_attributes: (Optional set(string))

  Specifies whether email addresse or phone_number can be specified as usernames when a user signs up. Conflicts with alias_attributes. Default is to use alias_attributes.

• allow_admin_create_user_only: (Optional bool)

  Set to True if only the administrator is allowed to create user profiles. Set to False if users can sign themselves up via an app. Default is true.

• invite_email_subject: (Optional string)

  The message template for email messages. Default is "Your verification code".

• invite_email_message: (Optional string)

  The message template for email messages. Must contain {username} and {####} placeholders, for username and temporary password, respectively. Default is "Your username is {username} and your temporary password is '{####}'".

• invite_sms_message: (Optional string)

  The message template for SMS messages. Must contain {username} and {####} placeholders, for username and temporary password, respectively. Default is "Your username is {username} and your temporary password is '{####}'.".

• auto_verified_attributes: (Optional set(string))

  The attributes to be auto-verified. Possible values: email, phone_number. Default is ["email"].

• challenge_required_on_new_device: (Optional bool) Indicates whether a challenge is required on a new device. Only applicable to a new device. Default is true.

• device_only_remembered_on_user_prompt: (Optional string)

  If true, a device is only remembered on user prompt. Default is true.

• enable_username_case_sensitivity: (Optional bool)

  Specifies whether username case sensitivity will be applied to all users in the user pool through Cognito APIs. Default is false.

• email_sending_account: (Optional string)

  The email delivery method to use. COGNITO_DEFAULT for the default email functionality built into Cognito or DEVELOPER to use your Amazon SES configuration. Default is "COGNITO_DEFAULT".

• email_reply_to_address: (Optional string)

  The REPLY-TO email address. Default is null.

• email_source_arn: (Optional string)

  The ARN of the email source. Default is null.

• email_from_address: (Optional string)

  Sender’s email address or sender’s name with their email address (e.g. 'john@smith.com' or 'John Smith john@smith.com'). Default is null.

• mfa_configuration: (Optional string)

  Multi-Factor Authentication (MFA) configuration for the User Pool. Valid values: ON, OFF or OPTIONAL. ON and OPTIONAL require at least one of sms_configuration or software_token_mfa_configuration to be configured. Default is "OPTIONAL".

• password_minimum_length: (Optional number)

  The minimum length of the password policy that you have set. Default is 20.

• password_require_lowercase: (Optional bool)

  Whether you have required users to use at least one lowercase letter in their password. Default is true.

• password_require_numbers: (Optional bool)

  Whether you have required users to use at least one number in their password. Default is true.

• password_require_symbols: (Optional bool)

  Whether you have required users to use at least one symbol in their password. Default is true.

• password_require_uppercase: (Optional bool)

  Whether you have required users to use at least one uppercase letter in their password. Default is true.

• temporary_password_validity_days: (Optional number)

  In the password policy you have set, refers to the number of days a temporary password is valid. If the user does not sign in during this time, their password will need to be reset by an administrator. Default is 1.

• allow_software_mfa_token: (Optional bool)

  Boolean whether to enable software token Multi-Factor Authentication (MFA) tokens, such as Time-Based One-Time Password (TOTP). To disable software token MFA when sms_configuration is not present, the mfa_configuration argument must be set to OFF and the software_token_mfa_configuration configuration block must be fully removed. Default is true.

• sms_authentication_message: (Optional string)

  A string representing the SMS authentication message. The message must contain the {####} placeholder, which will be replaced with the authentication code. Default is "Your temporary password is {####}.".

• lambda_create_auth_challenge: (Optional string)

  The ARN of an AWS Lambda creating an authentication challenge. Default is null.

• lambda_custom_message: (Optional string)

  The ARN of a custom message AWS Lambda trigger. Default is null.

• lambda_define_auth_challenge: (Optional string)

  The ARN of an AWS Lambda that defines the authentication challenge. Default is null.

• lambda_post_authentication: (Optional string)

  The ARN of an AWS Lambda that defines the authentication challenge. Default is null.

• lambda_post_confirmation: (Optional string)

  The ARN of a post-confirmation AWS Lambda trigger. Default is null.

• lambda_pre_authentication: (Optional string)

  The ARN of a pre-authentication AWS Lambda trigger. Default is null.

• lambda_pre_sign_up: (Optional string)

  The ARN of a pre-registration AWS Lambda trigger. Default is null.

• lambda_pre_token_generation: (Optional string)

  The ARN of an AWS Lambda that allows customization of identity token claims before token generation. Default is null.

• lambda_user_migration: (Optional string)

  The ARN of he user migration AWS Lambda config type. Default is null.

• lambda_verify_auth_challenge_response: (Optional string)

  The ARN of an AWS Lambda that verifies the authentication challenge response. Default is true.

• schema_attributes: (Optional any)

  A list of schema attributes of a user pool. You can add a maximum um 25 custom attributes. Please note that only default attributes can be marked as required. Also an attribute cannot be switched between required and not required after a user pool has been created. For details please see the attributes docs. Default is [].

  Example:

    schema_attributes = [
      {
        name = "gender", # overwrites the default attribute 'gender'
        type = "String"
        required = true  # required can only be set for default attributes
      },
      {
        name       = "alternative_name"
        type       = "String"
        min_length = 0,
        max_length = 2048
      },
      {
        name      = "friends_count"
        type      = "Number"
        min_value = 0,
        max_value = 100
      },
      {
        name = "is_active"
        type = "Boolean"
      },
      {
        name = "last_seen"
        type = "DateTime"
      }
    ]

• sms_configuration: (Optional object({external_id = string, sns_caller_arn = string}))

  The sms_configuration with the external_id parameter used in IAM role trust relationships and the sns_caller_arn parameter to set the ARN of the Amazon SNS caller. This is usually the IAM role that you have given AWS Cognito permission to assume. Default is null.

• default_email_option: (Optional string)

  The default email option. Must be either CONFIRM_WITH_CODE or CONFIRM_WITH_LINK. Default is "CONFIRM_WITH_CODE".

• email_message: (Optional string)

  The email message template. Must contain the {####} placeholder. Default is "Your verification code is {####}.".

• email_message_by_link: (Optional string)

  The email message template for sending a confirmation link to the user, it must contain the {##Click Here##} placeholder. Default is "Please click the link below to verify your email address. {##Verify Email##}.".

• email_subject: (Optional string)

  The subject line for the email message template. Default is "Your Verification Code".

• email_subject_by_link: (Optional string)

  The subject line for the email message template for sending a confirmation link to the user. Default is "Your Verifiction Link".

• sms_message: (Optional string)

  The SMS message template. Must contain the {####} placeholder, which will be replaced with the verification code. Can also contain the {username} placeholder which will be replaced with the username. Default is "Your verification code is {####}.".

• tags: (Optional map(string))

  A mapping of tags to assign to the resource. Default is {}.

  Example:

  tags  = {
    CreatedAt = "2020-02-07",
    Alice     = "Bob"
  }

Cognito User Pool Domain

• domain: (Optional string)

  The domain name that should be used. Can be set to a FQDN or prefix. If no FQDN and certificate_arn are set, the domain prefix will be used for the sign-up and sign-in pages that are hosted by Amazon Cognito, e.g. https://{YOUR_PREFIX}.auth.eu-west-1.amazoncognito.com. The prefix must be unique across the selected AWS Region. Domain names can only contain lower-case letters, numbers, and hyphens.

  Default is not to use a custom domain.

• certificate_arn : (Optional string)

  The ARN of an ISSUED ACM certificate in us-east-1 for a custom domain. Default is not to use a custom domain.

Cognito User Pool Clients

• clients: (Optional list(client))

  A list of objects with the clients definitions. Default is [].

  Example:

  A list of clients that follow the normal schema defined by the provider. For details please see Terraform AWS Cognito User Pool Client Docs.

  clients = [
    {
      name                 = "android-mobile-client"
      read_attributes      = ["email", "email_verified", "preferred_username"]
      allowed_oauth_scopes = ["email", "openid"]
      allowed_oauth_flows  = ["implicit"]
      callback_urls        = ["https://mineiros.io/callback", "https://mineiros.io/anothercallback"]
      default_redirect_uri = "https://mineiros.io/callback"
      generate_secret      = true
    }
  ]

Cognito User Pool Clients Default Values

The following variables can be used for setting default settings among various clients defined through the clients variable. This helps you to quickly issue several clients that implement the same settings, e.g. like so:

clients = [
  { name = "ios" },
  { name = "android" },
  { name = "web" },
]

default_client_read_attributes        = ["email", "email_verified", "preferred_username"]
default_client_allowed_oauth_scopes   = ["email", "openid"]
default_client_allowed_oauth_flows    = ["implicit"]
default_client_callback_urls          = ["https://mineiros.io/callback", "https://mineiros.io/anothercallback"]
default_client_default_redirect_uri   = "https://mineiros.io/callback"
default_client_generate_secret        = true
default_client_refresh_token_validity = 45

default_client_supported_identity_providers         = null
default_client_logout_urls                          = null
default_client_allowed_oauth_flows_user_pool_client = null
default_client_write_attributes                     = null
default_client_explicit_auth_flows                  = null
default_client_prevent_user_existence_errors        = null

• default_client_callback_urls: (Optional list(string))

  List of allowed callback URLs for the identity providers.

• default_client_default_redirect_uri: (Optional string)

  The default redirect URI. Must be in the list of callback URLs.

• default_client_read_attributes: (Optional list(string))

  List of Cognito User Pool attributes the application client can read from.

• default_client_refresh_token_validity: (Optional number)

  The time limit in days refresh tokens are valid for.

• default_client_supported_identity_providers: (Optional list(string))

  List of provider names for the identity providers that are supported on this client.

• default_client_allowed_oauth_scopes: (Optional list(string))

  List of allowed OAuth scopes. Possible values are phone, email, openid, profile, and aws.cognito.signin.user.admin.

• default_client_logout_urls: (Optional list(string))

  List of allowed logout URLs for the identity providers.

• default_client_allowed_oauth_flows_user_pool_client: (Optional bool)

  Whether the client is allowed to follow the OAuth protocol when interacting with Cognito User Pools.

• default_client_generate_secret: (Optional bool)

  Boolean flag for generating an application secret.

• default_client_allowed_oauth_flows: (Optional list(string))

  List of allowed OAuth flows. Possible flows are code, implicit, and client_credentials.

• default_client_write_attributes: (Optional list(string))

  List of Cognito User Pool attributes the application client can write to.

• default_client_explicit_auth_flows: (Optional list(string))

  List of authentication flows. Possible values are ADMIN_NO_SRP_AUTH, CUSTOM_AUTH_FLOW_ONLY, USER_PASSWORD_AUTH, ALLOW_ADMIN_USER_PASSWORD_AUTH, ALLOW_CUSTOM_AUTH, ALLOW_USER_PASSWORD_AUTH, ALLOW_USER_SRP_AUTH, and ALLOW_REFRESH_TOKEN_AUTH.

• default_client_prevent_user_existence_errors: (Optional string)

  Choose which errors and responses are returned by Cognito APIs during authentication, account confirmation, and password recovery when the user does not exist in the Cognito User Pool. When set to ENABLED and the user does not exist, authentication returns an error indicating either the username or password was incorrect, and account confirmation and password recovery return a response indicating a code was sent to a simulated destination. When set to LEGACY, those APIs will return a UserNotFoundException exception if the user does not exist in the Cognito User Pool.

Module Attributes Reference

The following attributes are exported by the module:

• user_pool: The cognito_user_pool object.
• clients: A list of cognito_user_pool_client objects.
• client_secrets: The secrets for all created cognito_user_pool_client resources.

External Documentation

• AWS Documentation:
  • https://docs.aws.amazon.com/cognito/latest/developerguide/cognito-user-identity-pools.html
  • https://docs.aws.amazon.com/cognito/latest/developerguide/user-pool-settings-client-apps.html
• Terraform AWS Provider Documentation:
  • https://www.terraform.io/docs/providers/aws/r/cognito_user_pool.html
  • https://www.terraform.io/docs/providers/aws/r/cognito_user_pool_client.html

Module Versioning

This Module follows the principles of Semantic Versioning (SemVer).

Given a version number MAJOR.MINOR.PATCH, we increment the:

1. MAJOR version when we make incompatible changes,
2. MINOR version when we add functionality in a backwards compatible manner, and
3. PATCH version when we make backwards compatible bug fixes.

Backwards compatibility in 0.0.z and 0.y.z version

• Backwards compatibility in versions 0.0.z is not guaranteed when z is increased. (Initial development)
• Backwards compatibility in versions 0.y.z is not guaranteed when y is increased. (Pre-release)

About Mineiros

Mineiros is a remote-first company headquartered in Berlin, Germany that solves development, automation and security challenges in cloud infrastructure.

Our vision is to massively reduce time and overhead for teams to manage and deploy production-grade and secure cloud infrastructure.

We offer commercial support for all of our modules and encourage you to reach out if you have any questions or need help. Feel free to email us at hello@mineiros.io or join our Community Slack channel.

Reporting Issues

We use GitHub Issues to track community reported issues and missing features.

Contributing

Contributions are always encouraged and welcome! For the process of accepting changes, we use Pull Requests. If you'd like more information, please see our Contribution Guidelines.

Makefile Targets

This repository comes with a handy Makefile. Run make help to see details on each available target.

License

This module is licensed under the Apache License Version 2.0, January 2004. Please see LICENSE for full details.

Copyright © 2020 Mineiros GmbH