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RPC_SECURITY_QOS_V2 structure

The RPC_SECURITY_QOS_V2 structure defines version 2 security quality-of-service settings on a binding handle. See Remarks for version availability on Windows editions.

Syntax


typedef struct _RPC_SECURITY_QOS_V2 {
  unsigned long Version;
  unsigned long Capabilities;
  unsigned long IdentityTracking;
  unsigned long ImpersonationType;
  unsigned long AdditionalSecurityInfoType;
  union {
    RPC_HTTP_TRANSPORT_CREDENTIALS *HttpCredentials;
  } u;
} RPC_SECURITY_QOS_V2, *PRPC_SECURITY_QOS_V2;

Members

Version

Version of the RPC_SECURITY_QOS structure being used. This topic documents version 2 of the RPC_SECURITY_QOS structure. See RPC_SECURITY_QOS, RPC_SECURITY_QOS_V3, RPC_SECURITY_QOS_V4, and RPC_SECURITY_QOS_V5 for other versions.

Capabilities

Security services being provided to the application. Capabilities is a set of flags that can be combined using the bitwise OR operator.

ValueMeaning
RPC_C_QOS_CAPABILITIES_DEFAULT

Used when no provider-specific capabilities are needed.

RPC_C_QOS_CAPABILITIES_MUTUAL_AUTH

Specifying this flag causes the RPC run time to request mutual authentication from the security provider. Some security providers do not support mutual authentication. If the security provider does not support mutual authentication, or the identity of the server cannot be established, a remote procedure call to such server fails with error RPC_S_SEC_PKG_ERROR.

Note  RPC relies on the SSP to indicate which security options were successfully negotiated; RPC in turn fails any call for which the SSP reports it could not negotiate an option. However, some security providers are known to report the successful negotiation of an option even when the option was not successfully negotiated. For example, NTLM will report successful negotiation of mutual authentication for backward compatibility reasons, even though it does not support mutual authentication. Check with the particular SSP being used to determine its behavior with respect to security options.

RPC_C_QOS_CAPABILITIES_MAKE_FULLSIC

Not currently implemented.

RPC_C_QOS_CAPABILITIES_ANY_AUTHORITY

Accepts the client's credentials even if the certificate authority (CA) is not in the server's list of trusted CAs. This constant is used only by the SCHANNEL SSP.

RPC_C_QOS_CAPABILITIES_IGNORE_DELEGATE_FAILURE

When specified, this flag directs the RPC runtime on the client to ignore an error to establish a security context that supports delegation. Normally, if the client asks for delegation and the security system cannot establish a security context that supports delegation, error RPC_S_SEC_PKG_ERROR is returned; when this flag is specified, no error is returned.

Note  Unsupported on Windows XP and earlier client editions, unsupported on Windows 2000 and earlier server editions.

RPC_C_QOS_CAPABILITIES_LOCAL_MA_HINT

When specified, this flag specifies to RPC that the server is local to the machine making the RPC call. In this situation RPC instructs the endpoint mapper to pick up only endpoints registered by the principal specified in the ServerPrincName or Sid members (these members are available in RPC_SECURITY_QOS_V3, RPC_SECURITY_QOS_V4, and RPC_SECURITY_QOS_V5 only). See Remarks for more information.

Note  Unsupported on Windows XP and earlier client editions, unsupported on Windows 2000 and earlier server editions.

 

IdentityTracking

Sets the context tracking mode. Should be set to one of the values shown in the following table.

ValueMeaning
RPC_C_QOS_IDENTITY_STATIC

Security context is created only once and is never revised during the entire communication, even if the client side changes it. This is the default behavior if RPC_SECURITY_QOS_V2 is not specified.

RPC_C_QOS_IDENTITY_DYNAMIC

Context is revised whenever the ModifiedId in the client's token is changed. All protocols use the ModifiedId (see note).

Windows 2000:  All remote protocols (all protocols other than ncalrpc) use the AuthenticationID, also known as the LogonId, to track changes in the client's identity. The ncalrpc protocol uses ModifiedId.

 

ImpersonationType

Level at which the server process can impersonate the client.

ValueMeaning
RPC_C_IMP_LEVEL_DEFAULT

Uses the default impersonation level.

RPC_C_IMP_LEVEL_ANONYMOUS

Client does not provide identification information to the server. The server cannot impersonate the client or identify the client. Many servers reject calls with this impersonation type.

RPC_C_IMP_LEVEL_IDENTIFY

Server can obtain the client's identity, and impersonate the client to perform Access Control List (ACL) checks, but cannot impersonate the client. See Impersonation Levels for more information.

Note  Some security providers may treat this impersonation type as equivalent to RPC_C_IMP_LEVEL_IMPERSONATE.

RPC_C_IMP_LEVEL_IMPERSONATE

Server can impersonate the client's security context on its local system, but not on remote systems.

RPC_C_IMP_LEVEL_DELEGATE

The server can impersonate the client's security context while acting on behalf of the client. The server can also make outgoing calls to other servers while acting on behalf of the client. The server may use the client's security context on other machines to access local and remote resources as the client.

 

AdditionalSecurityInfoType

Specifies the type of additional credentials present in the u union. The following constants are supported:

Supported ConstantsMeaning
0

No additional credentials are passed in the u union.

RPC_C_AUTHN_INFO_TYPE_HTTP

The HttpCredentials member of the u union points to a RPC_HTTP_TRANSPORT_CREDENTIALS structure. This value can be used only when the protocol sequence is ncacn_http. Any other protocol sequence returns RPC_S_INVALID_ARG.

 

u
HttpCredentials

Additional set of credentials to pass to RPC, in the form of an RPC_HTTP_TRANSPORT_CREDENTIALS structure. Used when the AdditionalSecurityInfoType member is set to RPC_C_AUTHN_INFO_TYPE_HTTP.

Remarks

The following listing defines the availability of QOS versions on various Windows operating systems:

  • Version 1: Windows 2000 and later.
  • Version 2: Windows XP with Service Pack 1 (SP1) and later.
  • Version 3: Windows Server 2003 and later.
  • Version 4: Windows Vista and later.
  • Version 5: Windows 8 and later.

Windows editions support downlevel versions as well. For example, Windows Server 2003 supports version 3, but also supports versions 1 and 2.

The client-side security functions RpcBindingInqAuthInfoEx and RpcBindingSetAuthInfo use the RPC_SECURITY_QOS structure to inquire about, or to set, the security quality of service for a binding handle.

RPC supports the RPC_C_QOS_CAPABILITIES_LOCAL_MA_HINT hint (unsupported on Windows XP and earlier client editions, unsupported on Windows 2000 and earlier server editions). This hint is used only when dynamic endpoints and mutual authentication are used. Furthermore, it is not supported for the ncadg_* protocol sequences. If this flag is used for a ncadg_* protocol sequence, or without using mutual authentication, RPC_S_INVALID_ARG is returned from the RpcBindingSetAuthInfoEx function call. This flag is designed to prevent a Denial of Service Attack. Using this flag forces the RPC Runtime to ask the endpoint mapper only for endpoints registered by the principal specified in the ServerPrincName or Sid members. This prevents an attacker on the local machine from trying to trick your RPC client to connect to a spoof endpoint it has registered in the endpoint mapper. Note that since the attack is local only (such as from a terminal server machine with many users), the flag also works only for RPC calls made locally.

Note  Some security providers, such as Kerberos, support delegation-impersonation type. On Windows editions that support delegation-impersonation type, if the client has asked for delegation but the security provider is unable to provide it, the call fails with PRC_S_SEC_PKG_ERROR unless the RPC_C_QOS_CAPABILITIES_IGNORE_DELEGATE_FAILURE flag is specified.

Requirements

Minimum supported client

Windows XP with SP1 [desktop apps only]

Minimum supported server

Windows Server 2003 [desktop apps only]

Header

Rpcdce.h (include Rpc.h)

See also

RpcBindingInqAuthInfoEx
RpcBindingSetAuthInfoEx
RPC_SECURITY_QOS
RPC_SECURITY_QOS_V3
RPC_SECURITY_QOS_V4
RPC_SECURITY_QOS_V5
RPC_HTTP_TRANSPORT_CREDENTIALS

 

 

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