Complete Backchannel Authentication - Authlete Documentation

Full description

After the implementation of the backchannel authentication endpoint returns JSON containing an auth_req_id to the client, the authorization server starts a background process that communicates with the authentication device of the end-user. On the authentication device, end-user authentication is performed and the end-user is asked whether they give authorization to the client or not. The authorization server will receive the result of end-user authentication and authorization from the authentication device. After the authorization server receives the result from the authentication device, or even in the case where the server gave up receiving a response from the authentication device for some reasons, the server should call the /backchannel/authentication/complete API to tell Authlete the result. When the end-user was authenticated and authorization was granted to the client by the end-user, the authorization server should call the API with result=AUTHORIZED. In this successful case, the subject request parameter is mandatory. If the token delivery mode is push, the API will generate an access token, an ID token and optionally a refresh token. On the other hand, if the token delivery mode is poll or ping, the API will just update the database record so that /auth/token API can generate tokens later. When the authorization server received the decision of the end-user from the authentication device and it indicates that the end-user has rejected to give authorization to the client, the authorization server should call the API with result=ACCESS_DENIED. In this case, if the token delivery mode is push, the API will generate an error response that contains the error response parameter and optionally the error_description and error_uri response parameters (if the errorDescription and errorUri request parameters have been given). On the other hand, if the token delivery mode is poll or ping, the API will just update the database record so that /auth/token API can generate an error response later. In any token delivery mode, the value of the error parameter will become access_denied. When the authorization server could not get the result of end-user authentication and authorization from the authentication device for some reasons, the authorization server should call the API with result=TRANSACTION_FAILED. In this error case, the API will behave in the same way as in the case of ACCESS_DENIED. The only difference is that expired_token is used as the value of the error parameter. The response from /backchannel/authentication/complete API has various parameters. Among them, it is action parameter that the authorization server implementation should check first because it denotes the next action that the authorization server implementation should take. According to the value of action, the service implementation must take the steps described below.

SERVER_ERROR

When the value of action is SERVER_ERROR, it means either (1) that the request from the authorization server to Authlete was wrong, or (2) that an error occurred on Authlete side. When the backchannel token delivery mode is ping or push, SERVER_ERROR is used only when an error is detected before the record of the ticket (which is included in the API call to /backchannel/authentication/complete) is retrieved from the database successfully. If an error is detected after the record of the ticket is retrieved from the database, NOTIFICATION is used instead of SERVER_ERROR. When the backchannel token delivery mode is poll, SERVER_ERROR is used regardless of whether it is before or after the record of the ticket is retrieved from the database.

NO_ACTION

When the value of action is NO_ACTION, it means that the authorization server does not have to take any immediate action. NO_ACTION is returned when the backchannel token delivery mode is poll. In this case, the client will receive the final result at the token endpoint.

NOTIFICATION

When the value of action is NOTIFICATION, it means that the authorization server must send a notification to the client notification endpoint. According to the CIBA Core specification, the notification is an HTTP POST request whose request body is JSON and whose Authorization header contains the client notification token, which was included in the backchannel authentication request as the value of the client_notification_token request parameter, as a bearer token. When the backchannel token delivery mode is ping, the request body of the notification is JSON which contains the auth_req_id property only. When the backchannel token delivery mode is push, the request body will additionally contain an access token, an ID token and other properties. Note that when the backchannel token delivery mode is poll, a notification does not have to be sent to the client notification endpoint. In error cases, in the ping mode, however, the content of a notification is not different from the content in successful cases. That is, the notification contains the auth_req_id property only. The client will know the error when it accesses the token endpoint. On the other hand, in the push mode, in error cases, the content of a notification will include the error property instead of an access token and an ID token. The client will know the error by detecting that error is included in the notification. In any case, the value of responseContent is JSON which can be used as the request body of the notification. The client notification endpoint that the notification should be sent to the value of the clientNotificationEndpoint parameter. Likewise, the client notification token that the notification should include as a bearer token is the clientNotificationToken parameter. With these methods, the notification can be built like the following.

POST &#123;clientNotificationEndpoint&#125; HTTP/1.1
HOST: &#123;The host of clientNotificationEndpoint&#125;
Authorization: Bearer &#123;notificationToken&#125;
Content-Type: application/json
&#123;responseContent&#125;

Authorizations

Authorization

string

header

required

Authenticate every request with a Service Access Token or Organization Token. Set the token value in the Authorization: Bearer <token> header.

Service Access Token: Scoped to a single service. Use when automating service-level configuration or runtime flows.

Organization Token: Scoped to the organization; inherits permissions across services. Use for org-wide automation or when managing multiple services programmatically.

Both token types are issued by the Authlete console or provisioning APIs.

Path Parameters

serviceId

string

required

A service ID.

Body

ticket

string

required

The ticket issued by Authlete's /backchannel/authentication API.

result

enum<string>

required

The result of the end-user authentication and authorization. One of the following. Details are described in the description.

Available options:

TRANSACTION_FAILED,

ACCESS_DENIED,

AUTHORIZED

subject

string

required

The subject (= unique identifier) of the end-user.

sub

string

The value of the sub claim that should be used in the ID token.

authTime

integer<int64>

The time at which the end-user was authenticated. Its value is the number of seconds from 1970-01-01.

acr

string

The reference of the authentication context class which the end-user authentication satisfied.

claims

string

Additional claims which will be embedded in the ID token.

properties

object[]

The extra properties associated with the access token.

Show child attributes

scopes

string[]

Scopes to replace the scopes specified in the original backchannel authentication request with. When nothing is specified for this parameter, replacement is not performed.

idtHeaderParams

string

JSON that represents additional JWS header parameters for ID tokens.

errorDescription

string

The description of the error. If this optional request parameter is given, its value is used as the value of the error_description property, but it is used only when the result is not AUTHORIZED. To comply with the specification strictly, the description must not include characters outside the set %x20-21 / %x23-5B / %x5D-7E.

errorUri

string

The URI of a document which describes the error in detail. This corresponds to the error_uri property in the response to the client.

consentedClaims

string[]

the claims that the user has consented for the client application to know.

jwtAtClaims

string

Additional claims that are added to the payload part of the JWT access token.

accessToken

string

The representation of an access token that may be issued as a result of the Authlete API call.

accessTokenDuration

integer<int64>

The duration (in seconds) of the access token that may be issued as a result of the Authlete API call.

When this request parameter holds a positive integer, it is used as the duration of the access token in. In other cases, this request parameter is ignored.

refreshTokenDuration

integer<int64>

The duration (in seconds) of the refresh token that may be issued as a result of the Authlete API call.

When this request parameter holds a positive integer, it is used as the duration of the refresh token in. In other cases, this request parameter is ignored.

idTokenAudType

string

The type of the aud claim of the ID token being issued. Valid values are as follows.

Value	Description
"array"	The type of the aud claim is always an array of strings.
"string"	The type of the aud claim is always a single string.
null	The type of the aud claim remains the same as before.

This request parameter takes precedence over the idTokenAudType property of the service.

Response

Backchannel authentication completed successfully

resultCode

string

The code which represents the result of the API call.

resultMessage

string

A short message which explains the result of the API call.

action

enum<string>

The next action that the authorization server implementation should take.

Available options:

SERVER_ERROR,

NO_ACTION,

NOTIFICATION

responseContent

string

The content that the authorization server implementation is to return to the client application. Its format varies depending on the value of action parameter.

clientId

integer<int64>

The client ID of the client application that has made the backchannel authentication request.

clientIdAlias

string

The client ID alias of the client application that has made the backchannel authentication request.

clientIdAliasUsed

boolean

true if the value of the client_id request parameter included in the backchannel authentication request is the client ID alias. false if the value is the original numeric client ID.

clientName

string

The name of the client application which has made the backchannel authentication request.

deliveryMode

enum<string>

Available options:

PING,

POLL,

PUSH

clientNotificationEndpoint

string

The client notification endpoint to which a notification needs to be sent. This corresponds to the client_notification_endpoint metadata of the client application.

clientNotificationToken

string

The client notification token which needs to be embedded as a Bearer token in the Authorization header in the notification. This is the value of the client_notification_token request parameter included in the backchannel authentication request.

authReqId

string

The newly issued authentication request ID.

accessToken

string

The issued access token.

refreshToken

string

The issued refresh token.

idToken

string

The issued ID token.

accessTokenDuration

integer<int64>

The duration of the access token in seconds.

refreshTokenDuration

integer<int64>

The duration of the refresh token in seconds.

idTokenDuration

integer<int64>

The duration of the ID token in seconds.

jwtAccessToken

string

The issued access token in JWT format.

resources

string[]

The resources specified by the resource request parameters or by the resource property in the request object. If both are given, the values in the request object should be set. See "Resource Indicators for OAuth 2.0" for details.

authorizationDetails

object

The authorization details. This represents the value of the authorization_details request parameter in the preceding device authorization request which is defined in "OAuth 2.0 Rich Authorization Requests".

Show child attributes

serviceAttributes

object[]

The attributes of this service that the client application belongs to.

Show child attributes

clientAttributes

object[]

The attributes of the client.

Show child attributes

grantId

string

the value of the grant_id request parameter of the device authorization request.

The grant_id request parameter is defined in Grant Management for OAuth 2.0 , which is supported by Authlete 2.3 and newer versions.

clientEntityId

string

The entity ID of the client.

clientEntityIdUsed

boolean

Flag which indicates whether the entity ID of the client was used when the request for the access token was made.

metadataDocumentLocation

string<uri>

The location of the client's metadata document that was used to resolve client metadata.

This property is set when client metadata was retrieved via the OAuth Client ID Metadata Document (CIMD) mechanism.

metadataDocumentUsed

boolean

Flag indicating whether a metadata document was used to resolve client metadata for this request.

When true, the client metadata was retrieved via the CIMD mechanism rather than from the Authlete database.

Authlete

​SERVER_ERROR

​NO_ACTION

​NOTIFICATION

Authorizations

Path Parameters

Body

Response

SERVER_ERROR

NO_ACTION

NOTIFICATION