Authentication Service Constants

Defines authentication services by identifying the security package that provides the service, such as NTLMSSP, Kerberos, or Schannel.

Constant/value	Description
RPC_C_AUTHN_NONE 0	No authentication.
RPC_C_AUTHN_DCE_PRIVATE 1	DCE private key authentication.
RPC_C_AUTHN_DCE_PUBLIC 2	DCE public key authentication.
RPC_C_AUTHN_DEC_PUBLIC 4	DEC public key authentication. Reserved for future use.
RPC_C_AUTHN_GSS_NEGOTIATE 9	Snego security support provider.
RPC_C_AUTHN_WINNT 10	NTLMSSP
RPC_C_AUTHN_GSS_SCHANNEL 14	Schannel security support provider. This authentication service supports SSL 2.0, SSL 3.0, TLS, and PCT.
RPC_C_AUTHN_GSS_KERBEROS 16	Kerberos security support provider.
RPC_C_AUTHN_DPA 17	DPA security support provider.
RPC_C_AUTHN_MSN 18	MSN security support provider.
RPC_C_AUTHN_KERNEL 20	Kernel security support provider.
RPC_C_AUTHN_DIGEST 21	Digest security support provider.
RPC_C_AUTHN_NEGO_EXTENDER 30	NEGO extender security support provider.
RPC_C_AUTHN_PKU2U 31	PKU2U security support provider.
RPC_C_AUTHN_MQ 100	MQ security support provider.
RPC_C_AUTHN_DEFAULT 0xFFFFFFFFL	The system default authentication service. When this value is specified, COM uses its normal security blanket negotiation algorithm to pick an authentication service. For more information, see Security Blanket Negotiation.

Remarks

These constants are used in the SOLE_AUTHENTICATION_SERVICE and the SOLE_AUTHENTICATION_INFO structures. The SOLE_AUTHENTICATION_SERVICE structure is passed by the server to the CoInitializeSecurity function and can be retrieved by the CoQueryAuthenticationServices function. A pointer to a SOLE_AUTHENTICATION_INFO structure is passed by the client to CoInitializeSecurity. For more information on the security packages identified by these values, such as NTLMSSP and Kerberos, see COM and Security Packages.

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Header	RpcDce.h