InitiateAuthRequest Class | AWS SDK for .NET V3

Container for the parameters to the InitiateAuth operation. Declares an authentication flow and initiates sign-in for a user in the Amazon Cognito user directory. Amazon Cognito might respond with an additional challenge or an AuthenticationResult that contains the outcome of a successful authentication. You can't sign in a user with a federated IdP with InitiateAuth. For more information, see Authentication.

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.

Inheritance Hierarchy

System.Object
  Amazon.Runtime.AmazonWebServiceRequest
    Amazon.CognitoIdentityProvider.AmazonCognitoIdentityProviderRequest
      Amazon.CognitoIdentityProvider.Model.InitiateAuthRequest

Namespace: Amazon.CognitoIdentityProvider.Model
Assembly: AWSSDK.CognitoIdentityProvider.dll
Version: 3.x.y.z

Syntax

public class InitiateAuthRequest : AmazonCognitoIdentityProviderRequest
         IAmazonWebServiceRequest

The InitiateAuthRequest type exposes the following members

Constructors

	Name	Description
	InitiateAuthRequest()

Properties

Name	Type	Description
AnalyticsMetadata	Amazon.CognitoIdentityProvider.Model.AnalyticsMetadataType	Gets and sets the property AnalyticsMetadata. Information that supports analytics outcomes with Amazon Pinpoint, including the user's endpoint ID. The endpoint ID is a destination for Amazon Pinpoint push notifications, for example a device identifier, email address, or phone number.
AuthFlow	Amazon.CognitoIdentityProvider.AuthFlowType	Gets and sets the property AuthFlow. The authentication flow that you want to initiate. Each `AuthFlow` has linked `AuthParameters` that you must submit. The following are some example flows. USER_AUTH The entry point for choice-based authentication with passwords, one-time passwords, and WebAuthn authenticators. Request a preferred authentication type or review available authentication types. From the offered authentication types, select one in a challenge response and then authenticate with that method in an additional challenge response. To activate this setting, your user pool must be in the Essentials tier or higher. USER_SRP_AUTH Username-password authentication with the Secure Remote Password (SRP) protocol. For more information, see Use SRP password verification in custom authentication flow. REFRESH_TOKEN_AUTH and REFRESH_TOKEN Receive new ID and access tokens when you pass a `REFRESH_TOKEN` parameter with a valid refresh token as the value. For more information, see Using the refresh token. CUSTOM_AUTH Custom authentication with Lambda triggers. For more information, see Custom authentication challenge Lambda triggers. USER_PASSWORD_AUTH Client-side username-password authentication with the password sent directly in the request. For more information about client-side and server-side authentication, see SDK authorization models. `ADMIN_USER_PASSWORD_AUTH` is a flow type of `AdminInitiateAuth` and isn't valid for InitiateAuth. `ADMIN_NO_SRP_AUTH` is a legacy server-side username-password flow and isn't valid for InitiateAuth.
AuthParameters	System.Collections.Generic.Dictionary<System.String, System.String>	Gets and sets the property AuthParameters. The authentication parameters. These are inputs corresponding to the `AuthFlow` that you're invoking. The required values are specific to the InitiateAuthRequest$AuthFlow. The following are some authentication flows and their parameters. Add a `SECRET_HASH` parameter if your app client has a client secret. `USER_AUTH`: `USERNAME` (required), `PREFERRED_CHALLENGE`. If you don't provide a value for `PREFERRED_CHALLENGE`, Amazon Cognito responds with the `AvailableChallenges` parameter that specifies the available sign-in methods. `USER_SRP_AUTH`: `USERNAME` (required), `SRP_A` (required), `DEVICE_KEY`. `USER_PASSWORD_AUTH`: `USERNAME` (required), `PASSWORD` (required), `DEVICE_KEY`. `REFRESH_TOKEN_AUTH/REFRESH_TOKEN`: `REFRESH_TOKEN` (required), `DEVICE_KEY`. `CUSTOM_AUTH`: `USERNAME` (required), `SECRET_HASH` (if app client is configured with client secret), `DEVICE_KEY`. To start the authentication flow with password verification, include `ChallengeName: SRP_A` and `SRP_A: (The SRP_A Value)`. 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.
ClientId	System.String	Gets and sets the property ClientId. The ID of the app client that your user wants to sign in to.
ClientMetadata	System.Collections.Generic.Dictionary<System.String, System.String>	Gets and sets the property ClientMetadata. A map of custom key-value pairs that you can provide as input for certain custom workflows that this action triggers. You create custom workflows by assigning Lambda functions to user pool triggers. When you send an `InitiateAuth` request, Amazon Cognito invokes the Lambda functions that are specified for various triggers. The `ClientMetadata` value is passed as input to the functions for only the following triggers. Pre sign-up Pre authentication User migration When Amazon Cognito invokes the functions for these triggers, it passes a JSON payload as input to the function. This payload contains a `validationData` attribute with the data that you assigned to the `ClientMetadata` parameter in your `InitiateAuth` request. In your function, `validationData` can contribute to operations that require data that isn't in the default payload. `InitiateAuth` requests invokes the following triggers without `ClientMetadata` as input. Post authentication Custom message Pre token generation Create auth challenge Define auth challenge Custom email sender Custom SMS sender For more information, see Using Lambda triggers in the Amazon Cognito Developer Guide. When you use the `ClientMetadata` parameter, note 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 send sensitive information in this parameter.
Session	System.String	Gets and sets the property Session. The optional session ID from a `ConfirmSignUp` API request. You can sign in a user directly from the sign-up process with the `USER_AUTH` authentication flow. When you pass the session ID to `InitiateAuth`, Amazon Cognito assumes the SMS or email message one-time verification password from `ConfirmSignUp` as the primary authentication factor. You're not required to submit this code a second time. This option is only valid for users who have confirmed their sign-up and are signing in for the first time within the authentication flow session duration of the session ID.
UserContextData	Amazon.CognitoIdentityProvider.Model.UserContextDataType	Gets and sets the property UserContextData. Contextual data about your user session like the device fingerprint, IP address, or location. Amazon Cognito threat protection 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. For more information, see Collecting data for threat protection in applications.

Examples

The following example signs in the user mytestuser with analytics data, client metadata, and user context data for advanced security.

Example username and password sign-in for a user who has TOTP MFA


var client = new AmazonCognitoIdentityProviderClient();
var response = client.InitiateAuth(new InitiateAuthRequest 
{
    AnalyticsMetadata = new AnalyticsMetadataType { AnalyticsEndpointId = "d70b2ba36a8c4dc5a04a0451a31a1e12" },
    AuthFlow = "USER_PASSWORD_AUTH",
    AuthParameters = new Dictionary<string, string> {
        { "PASSWORD", "This-is-my-test-99!" },
        { "SECRET_HASH", "oT5ZkS8ctnrhYeeGsGTvOzPhoc/Jd1cO5fueBWFVmp8=" },
        { "USERNAME", "mytestuser" }
    },
    ClientId = "1example23456789",
    ClientMetadata = new Dictionary<string, string> {
        { "MyTestKey", "MyTestValue" }
    },
    UserContextData = new UserContextDataType {
        EncodedData = "AmazonCognitoAdvancedSecurityData_object",
        IpAddress = "192.0.2.1"
    }
});

string challengeName = response.ChallengeName;
Dictionary<string, string> challengeParameters = response.ChallengeParameters;
string session = response.Session;

Version Information

.NET:
Supported in: 8.0 and newer, Core 3.1

.NET Standard:
Supported in: 2.0

.NET Framework:
Supported in: 4.5 and newer, 3.5