The authentication-level constants represent authentication levels passed to various run-time functions. These levels are listed in order of increasing authentication. Each new level adds to the authentication provided by the previous level. If the RPC run-time library does not support the specified level, it automatically upgrades to the next higher supported level.
| Constant | Description |
RPC_C_AUTHN_LEVEL_DEFAULT | Uses the default authentication level for the specified authentication service. |
RPC_C_AUTHN_LEVEL_NONE | Performs no authentication. |
RPC_C_AUTHN_LEVEL_CONNECT | Authenticates only when the client establishes a relationship with a server. |
RPC_C_AUTHN_LEVEL_CALL | Authenticates only at the beginning of each remote procedure call when the server receives the request. Does not apply to remote procedure calls made using the connection-based protocol sequences (those that start with the prefix "ncacn"). If the protocol sequence in a binding handle is a connection-based protocol sequence and you specify this level, this routine instead uses the RPC_C_AUTHN_LEVEL_PKT constant. |
RPC_C_AUTHN_LEVEL_PKT | Authenticates only that all data received is from the expected client. Does not validate the data itself. |
RPC_C_AUTHN_LEVEL_PKT_INTEGRITY | Authenticates and verifies that none of the data transferred between client and server has been modified. |
RPC_C_AUTHN_LEVEL_PKT_PRIVACY | Includes all previous levels, and ensures clear text data can only be seen by the sender and the receiver. In the local case, this involves using a secure channel. In the remote case, this involves encrypting the argument value of each remote procedure call. |
Remarks
Regardless of the value specified by the constant, ncalrpc always uses RPC_C_AUTHN_LEVEL_PKT_PRIVACY.
RPC_C_AUTHN_LEVEL_CALL, RPC_C_AUTHN_LEVEL_PKT, RPC_C_AUTHN_LEVEL_PKT_INTEGRITY, and RPC_C_AUTHN_LEVEL_PKT_PRIVACY are not supported on Windows Me/98/95; a Windows Me/98/95 server can only accept incoming calls at the RPC_C_AUTHN_LEVEL_CONNECT level.
Requirements
| Client | Requires Windows Vista, Windows XP, or Windows 2000 Professional. |
| Server | Requires Windows Server 2008, Windows Server 2003, or Windows 2000 Server. |
| Header | Declared in Rpcdce.h. |
See Also
RpcBindingInqAuthInfo
RpcBindingSetAuthInfo
RpcMgmtInqDefaultProtectLevel
RpcBindingInqAuthClient
RpcBindingInqAuthClientEx
RpcBindingSetAuthInfoEx
RpcBindingInqAuthInfoEx
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Build date: 2/7/2008