RpcServerRegisterAuthInfo function (rpcdce.h)

Article
08/19/2022

The RpcServerRegisterAuthInfo function registers authentication information with the RPC run-time library.

Syntax

RPC_STATUS RpcServerRegisterAuthInfo(
  RPC_CSTR                  ServerPrincName,
  unsigned long             AuthnSvc,
  RPC_AUTH_KEY_RETRIEVAL_FN GetKeyFn,
  void                      *Arg
);

Parameters

ServerPrincName

Pointer to the principal name to use for the server when authenticating remote procedure calls using the service specified by the AuthnSvc parameter. The content of the name and its syntax are defined by the authentication service in use. For more information, see Principal Names.

AuthnSvc

Authentication service to use when the server receives a request for a remote procedure call.

GetKeyFn

Address of a server-application-provided routine that returns encryption keys. See RPC_AUTH_KEY_RETRIEVAL_FN.

Specify a NULL parameter value to use the default method of encryption-key acquisition. In this case, the authentication service specifies the default behavior. Set this parameter to NULL when using the RPC_C_AUTHN_WINNT authentication service.

Authentication service	GetKeyFn	Arg	Run-time behavior
RPC_C_AUTHN_DPA	Ignored	Ignored	Does not support
RPC_C_AUTHN_GSS_KERBEROS	Ignored	Ignored	Does not support
RPC_C_AUTHN_GSS_NEGOTIATE	Ignored	Ignored	Does not support
RPC_C_AUTHN_GSS_SCHANNEL	Ignored	Ignored	Does not support
RPC_C_AUTHN_MQ	Ignored	Ignored	Does not support
RPC_C_AUTHN_MSN	Ignored	Ignored	Does not support
RPC_C_AUTHN_WINNT	Ignored	Ignored	Does not support
RPC_C_AUTHN_DCE_PRIVATE	NULL	Non-null	Uses default method of encryption-key acquisition from specified key table; specified argument is passed to default acquisition function.
RPC_C_AUTHN_DCE_PRIVATE	Non-null	NULL	Uses specified encryption-key acquisition function to obtain keys from default key table.
RPC_C_AUTHN_DCE_PRIVATE	Non-null	Non-null	Uses specified encryption-key acquisition function to obtain keys from specified key table; specified argument is passed to acquisition function.
RPC_C_AUTHN_DEC_PUBLIC	Ignored	Ignored	Reserved for future use.

The RPC run-time library passes the ServerPrincName parameter value from RpcServerRegisterAuthInfo as the ServerPrincName parameter value to the GetKeyFn acquisition function. The RPC run-time library automatically provides a value for the key version (KeyVer) parameter. For a KeyVer parameter value of zero, the acquisition function must return the most recent key available. The retrieval function returns the authentication key in the Key parameter.

If the acquisition function called from RpcServerRegisterAuthInfo returns a status other than RPC_S_OK, then this function fails and returns an error code to the server application. If the acquisition function called by the RPC run-time library while authenticating a client's remote procedure call request returns a status other than RPC_S_OK, the request fails and the RPC run-time library returns an error code to the client application.

Arg

Pointer to a parameter to pass to the GetKeyFn routine, if specified. This parameter can also be used to pass a pointer to an SCHANNEL_CRED structure to specify explicit credentials if the authentication service is set to SCHANNEL.

If the Arg parameter is set to NULL, this function will use the default certificate or credential if it has been set up in the directory service.

Return value

Value	Meaning
RPC_S_OK	The call succeeded.
RPC_S_UNKNOWN_AUTHN_SERVICE	The authentication service is unknown.

Note For a list of valid error codes, see RPC Return Values.

Remarks

A server application calls RpcServerRegisterAuthInfo to register an authentication service to use for authenticating remote procedure calls. A server calls this routine once for each authentication service the server wants to register. If the server calls this function more than once for a given authentication service, the results are undefined.

The authentication service that a client application specifies (using RpcBindingSetAuthInfo or RpcServerRegisterAuthInfo) must be one of the authentication services specified by the server application. Otherwise, the client's remote procedure call fails and an RPC_S_UNKNOWN_AUTHN_SERVICE status code is returned.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	rpcdce.h (include Rpc.h)
Library	Rpcrt4.lib
DLL	Rpcrt4.dll