Skip to content

Respond To Auth Challenge

cognitoidentityprovider_respond_to_auth_challenge R Documentation

Some API operations in a user pool generate a challenge, like a prompt for an MFA code, for device authentication that bypasses MFA, or for a custom authentication challenge

Description

Some API operations in a user pool generate a challenge, like a prompt for an MFA code, for device authentication that bypasses MFA, or for a custom authentication challenge. A respond_to_auth_challenge API request provides the answer to that challenge, like a code or a secure remote password (SRP). The parameters of a response to an authentication challenge vary with the type of challenge.

For more information about custom authentication challenges, see Custom authentication challenge Lambda triggers.

Amazon Cognito doesn't evaluate Identity and Access Management (IAM) policies in requests for this API operation. For this operation, you can't use IAM credentials to authorize requests, and you can't grant IAM permissions in policies. For more information about authorization models in Amazon Cognito, see Using the Amazon Cognito user pools API and user pool endpoints.

This action might generate an SMS text message. Starting June 1, 2021, US telecom carriers require you to register an origination phone number before you can send SMS messages to US phone numbers. If you use SMS text messages in Amazon Cognito, you must register a phone number with Amazon Pinpoint. Amazon Cognito uses the registered number automatically. Otherwise, Amazon Cognito users who must receive SMS messages might not be able to sign up, activate their accounts, or sign in.

If you have never used SMS text messages with Amazon Cognito or any other Amazon Web Services service, Amazon Simple Notification Service might place your account in the SMS sandbox. In sandbox mode , you can send messages only to verified phone numbers. After you test your app while in the sandbox environment, you can move out of the sandbox and into production. For more information, see SMS message settings for Amazon Cognito user pools in the Amazon Cognito Developer Guide.

Usage

cognitoidentityprovider_respond_to_auth_challenge(ClientId,
  ChallengeName, Session, ChallengeResponses, AnalyticsMetadata,
  UserContextData, ClientMetadata)

Arguments

ClientId

[required] The app client ID.

ChallengeName

[required] The challenge name. For more information, see initiate_auth.

ADMIN_NO_SRP_AUTH isn't a valid value.

Session

The session that should be passed both ways in challenge-response calls to the service. If initiate_auth or respond_to_auth_challenge API call determines that the caller must pass another challenge, they return a session with other challenge parameters. This session should be passed as it is to the next respond_to_auth_challenge API call.

ChallengeResponses

The responses to the challenge that you received in the previous request. Each challenge has its own required response parameters. The following examples are partial JSON request bodies that highlight challenge-response parameters.

You must provide a SECRET_HASH parameter in all challenge responses to an app client that has a client secret.

SMS_MFA

⁠"ChallengeName": "SMS_MFA", "ChallengeResponses": {"SMS_MFA_CODE": "[SMS_code]", "USERNAME": "[username]"}⁠

PASSWORD_VERIFIER

⁠"ChallengeName": "PASSWORD_VERIFIER", "ChallengeResponses": {"PASSWORD_CLAIM_SIGNATURE": "[claim_signature]", "PASSWORD_CLAIM_SECRET_BLOCK": "[secret_block]", "TIMESTAMP": [timestamp], "USERNAME": "[username]"}⁠

Add "DEVICE_KEY" when you sign in with a remembered device.

CUSTOM_CHALLENGE

⁠"ChallengeName": "CUSTOM_CHALLENGE", "ChallengeResponses": {"USERNAME": "[username]", "ANSWER": "[challenge_answer]"}⁠

Add "DEVICE_KEY" when you sign in with a remembered device.

NEW_PASSWORD_REQUIRED

⁠"ChallengeName": "NEW_PASSWORD_REQUIRED", "ChallengeResponses": {"NEW_PASSWORD": "[new_password]", "USERNAME": "[username]"}⁠

To set any required attributes that initiate_auth returned in an requiredAttributes parameter, add "userAttributes.[attribute_name]": "[attribute_value]". This parameter can also set values for writable attributes that aren't required by your user pool.

In a NEW_PASSWORD_REQUIRED challenge response, you can't modify a required attribute that already has a value. In respond_to_auth_challenge, set a value for any keys that Amazon Cognito returned in the requiredAttributes parameter, then use the update_user_attributes API operation to modify the value of any additional attributes.

SOFTWARE_TOKEN_MFA

⁠"ChallengeName": "SOFTWARE_TOKEN_MFA", "ChallengeResponses": {"USERNAME": "[username]", "SOFTWARE_TOKEN_MFA_CODE": [authenticator_code]}⁠

DEVICE_SRP_AUTH

⁠"ChallengeName": "DEVICE_SRP_AUTH", "ChallengeResponses": {"USERNAME": "[username]", "DEVICE_KEY": "[device_key]", "SRP_A": "[srp_a]"}⁠

DEVICE_PASSWORD_VERIFIER

⁠"ChallengeName": "DEVICE_PASSWORD_VERIFIER", "ChallengeResponses": {"DEVICE_KEY": "[device_key]", "PASSWORD_CLAIM_SIGNATURE": "[claim_signature]", "PASSWORD_CLAIM_SECRET_BLOCK": "[secret_block]", "TIMESTAMP": [timestamp], "USERNAME": "[username]"}⁠

MFA_SETUP

⁠"ChallengeName": "MFA_SETUP", "ChallengeResponses": {"USERNAME": "[username]"}, "SESSION": "[Session ID from VerifySoftwareToken]"⁠

SELECT_MFA_TYPE

⁠"ChallengeName": "SELECT_MFA_TYPE", "ChallengeResponses": {"USERNAME": "[username]", "ANSWER": "[SMS_MFA or SOFTWARE_TOKEN_MFA]"}⁠

For more information about SECRET_HASH, see Computing secret hash values. For information about DEVICE_KEY, see Working with user devices in your user pool.

AnalyticsMetadata

The Amazon Pinpoint analytics metadata that contributes to your metrics for respond_to_auth_challenge calls.

UserContextData

Contextual data about your user session, such as the device fingerprint, IP address, or location. Amazon Cognito advanced security evaluates the risk of an authentication event based on the context that your app generates and passes to Amazon Cognito when it makes API requests.

ClientMetadata

A map of custom key-value pairs that you can provide as input for any custom workflows that this action triggers.

You create custom workflows by assigning Lambda functions to user pool triggers. When you use the RespondToAuthChallenge API action, Amazon Cognito invokes any functions that are assigned to the following triggers: post authentication, pre token generation, define auth challenge, create auth challenge, and verify auth challenge. When Amazon Cognito invokes any of these functions, it passes a JSON payload, which the function receives as input. This payload contains a clientMetadata attribute, which provides the data that you assigned to the ClientMetadata parameter in your RespondToAuthChallenge request. In your function code in Lambda, you can process the clientMetadata value to enhance your workflow for your specific needs.

For more information, see Customizing user pool Workflows with Lambda Triggers in the Amazon Cognito Developer Guide.

When you use the ClientMetadata parameter, remember that Amazon Cognito won't do the following:

  • Store the ClientMetadata value. This data is available only to Lambda triggers that are assigned to a user pool to support custom workflows. If your user pool configuration doesn't include triggers, the ClientMetadata parameter serves no purpose.

  • Validate the ClientMetadata value.

  • Encrypt the ClientMetadata value. Don't use Amazon Cognito to provide sensitive information.

Value

A list with the following syntax: 

list(
  ChallengeName = "SMS_MFA"|"SOFTWARE_TOKEN_MFA"|"SELECT_MFA_TYPE"|"MFA_SETUP"|"PASSWORD_VERIFIER"|"CUSTOM_CHALLENGE"|"DEVICE_SRP_AUTH"|"DEVICE_PASSWORD_VERIFIER"|"ADMIN_NO_SRP_AUTH"|"NEW_PASSWORD_REQUIRED",
  Session = "string",
  ChallengeParameters = list(
    "string"
  ),
  AuthenticationResult = list(
    AccessToken = "string",
    ExpiresIn = 123,
    TokenType = "string",
    RefreshToken = "string",
    IdToken = "string",
    NewDeviceMetadata = list(
      DeviceKey = "string",
      DeviceGroupKey = "string"
    )
  )
)

Request syntax

svc$respond_to_auth_challenge(
  ClientId = "string",
  ChallengeName = "SMS_MFA"|"SOFTWARE_TOKEN_MFA"|"SELECT_MFA_TYPE"|"MFA_SETUP"|"PASSWORD_VERIFIER"|"CUSTOM_CHALLENGE"|"DEVICE_SRP_AUTH"|"DEVICE_PASSWORD_VERIFIER"|"ADMIN_NO_SRP_AUTH"|"NEW_PASSWORD_REQUIRED",
  Session = "string",
  ChallengeResponses = list(
    "string"
  ),
  AnalyticsMetadata = list(
    AnalyticsEndpointId = "string"
  ),
  UserContextData = list(
    IpAddress = "string",
    EncodedData = "string"
  ),
  ClientMetadata = list(
    "string"
  )
)