HTTP_FILTER_AUTH_COMPLETE_INFO Structure

The Forefront TMG Web proxy includes a pointer to the HTTP_FILTER_AUTH_COMPLETE_INFO structure in the notification that it sends to Web filters after it has successfully completed authentication. If your filter should be notified for this event, it must register to receive SF_NOTIFY_AUTH_COMPLETE notifications. For more information about the types of event notifications that are sent to Web filters, see Event Notifications.

Note When you are creating a Web filter for Forefront TMG, we recommend that you use WPX_HTTP_FILTER_AUTH_COMPLETE_INFO rather than HTTP_FILTER_AUTH_COMPLETE_INFO.

Syntax

typedef struct _HTTP_FILTER_AUTH_COMPLETE_INFO {

  BOOL (WINAPI)* GetHeader;

  BOOL (WINAPI)* SetHeader;

  BOOL (WINAPI)* AddHeader;

  BOOL (WINAPI)* GetUserToken;

  DWORD HttpStatus;

  BOOL fResetAuth;

  DWORD dwReserved;
} HTTP_FILTER_AUTH_COMPLETE_INFO, 

 *PHTTP_FILTER_AUTH_COMPLETE_INFO;

Members

GetHeader: Pointer to the GetHeader callback function, which can be used to retrieve a specified header or a portion of the request line in the incoming request. Header names include a trailing colon (:). Individual portions of the request line are specified by the special values "method", "URL", and "version". The special values are case-sensitive and must not include the trailing colon.
SetHeader: Pointer to the SetHeader callback function, which can be used to modify or delete the value of a header or to add a new header. Unlike the IIS function of the same name, this function cannot be used to modify the portions of the request line specified by the special values.
AddHeader: Pointer to the AddHeader callback function, which can be used to add an HTTP header to the request.
GetUserToken: Pointer to the GetUserToken function that returns a handle to the token of the user for whom impersonation will be performed.
HttpStatus: Not used.
fResetAuth: If set to TRUE, the authentication process will be reset, and no impersonation will be done.
dwReserved: A DWORD reserved for later use.

Remarks

This structure allows you to view the method, URL, version, or headers, or to modify the headers sent from the client.

The SF_NOTIFY_AUTH_COMPLETE notification is sent after the client's identity has been negotiated with the client, or when the client is anonymous. Because of the timing of this notification, the AUTH_USER server variable can be used to reliably obtain the identity of the user. Also, functionality is provided to retrieve a copy of the token that Forefront TMG will use to impersonate the client when processing the request.

All authentication scheme processes should result in either SF_NOTIFY_AUTH_COMPLETE, authentication, giving the filter a handle to a token of the user to be impersonated, or ACCESS_DENIED, when the user is not recognized by the system.

The SF_NOTIFY_AUTH_COMPLETE notification may be used for:

Accessing the user token of the user to be impersonated.
Actions that can be done in PREPROC_HEADERS, such as GET/ADD or SET request headers.
Resetting authentication.

Note If a filter needs to add Authorization headers after a request is authenticated and before the request is sent to the upstream proxy server or Web server, it must do so by parsing the request after the SF_NOTIFY_FORWARD_RAW_DATA notification, rather than after the SF_NOTIFY_AUTH_COMPLETE notification.

This is because when the request is authenticated, Forefront TMG removes every Authorization header before sending the request on to the upstream proxy server or Web server. (In forward-proxy scenarios, it removes Proxy-Authorization headers. In reverse-proxy scenarios, it removes Authorization headers.) Therefore, even if the filter adds an Authorization header after receiving the SF_NOTIFY_AUTH_COMPLETE notification, it will be removed.

Requirements

Server	Requires Windows Server 2008.
Version	Requires Forefront Threat Management Gateway (TMG).
Header	Declared in Httpfilt.h.

HTTP_FILTER_AUTH_COMPLETE_INFO Structure

Syntax

Members

Remarks

Requirements

See Also