| Platform SDK: Access Control |
The SECURITY_IMPERSONATION_LEVEL enumeration type contains values that specify security impersonation levels. Security impersonation levels govern the degree to which a server process can act on behalf of a client process.
typedef enum _SECURITY_IMPERSONATION_LEVEL {
SecurityAnonymous,
SecurityIdentification,
SecurityImpersonation,
SecurityDelegation
} SECURITY_IMPERSONATION_LEVEL;
| Enumerator Value | Meaning |
|---|---|
| SecurityAnonymous | The server process cannot obtain identification information about the client and it cannot impersonate the client. It is defined with no value given, and thus, by ANSI C rules, defaults to a value of 0. |
| SecurityIdentification | The server process can obtain information about the client, such as security identifiers and privileges, but it cannot impersonate the client. This is useful for servers that export their own objects — for example, database products that export tables and views. Using the retrieved client-security information, the server can make access-validation decisions without being able to utilize other services using the client's security context. |
| SecurityImpersonation | The server process can impersonate the client's security context on its local system. The server cannot impersonate the client on remote systems. |
| SecurityDelegation | The server process can impersonate the client's security context on remote systems.
Windows NT: This impersonation level is not supported. Windows 2000: This impersonation level is supported. |
Impersonation is the ability of a process to take on the security attributes of another process.
Windows NT/2000: Requires Windows NT 3.1 or later.
Header: Declared in Winnt.h; include Windows.h.
Client/Server Access Control Overview, Client/Server Access Control Enumeration Types, CreatePrivateObjectSecurity, DuplicateToken, DuplicateTokenEx, GetTokenInformation, ImpersonateSelf, OpenThreadToken