GetTokenInformation

The GetTokenInformation function retrieves a specified type of information about an access token. The calling process must have appropriate access rights to obtain the information.

BOOL GetTokenInformation(

HANDLE TokenHandle,	// handle of access token
TOKEN_INFORMATION_CLASS TokenInformationClass,	// type of information to retrieve
LPVOID TokenInformation,	// address of retrieved information
DWORD TokenInformationLength,	// size of information buffer
PDWORD ReturnLength	// address of required buffer size
);

Parameters

TokenHandle

Identifies an access token from which information is retrieved.

TokenInformationClass

Specifies a variable of the TOKEN_INFORMATION_CLASS enumerated type identifying the type of information the function retrieves.

TokenInformation

Points to a buffer the function fills with the requested information. The structure put into this buffer depends upon the type of information specified by the TokenInformationClass parameter, as shown in the following list:

Token Information Class	Structure Returned
TokenUser	TOKEN_USER structure. TOKEN_QUERY access is needed to retrieve this information.
TokenGroups	TOKEN_GROUPS structure. TOKEN_QUERY access is needed to retrieve this information.
TokenPrivileges	TOKEN_PRIVILEGES structure. TOKEN_QUERY access is needed to retrieve this information.
TokenOwner	TOKEN_OWNER structure. TOKEN_QUERY access is needed to retrieve this information.
TokenPrimaryGroup	TOKEN_PRIMARY_GROUP structure. TOKEN_QUERY access is needed to retrieve this information.
TokenDefaultDacl	TOKEN_DEFAULT_DACL structure. TOKEN_QUERY access is needed to retrieve this information.
TokenSource	TOKEN_SOURCE structure. TOKEN_QUERY_SOURCE access is needed to retrieve this information.
TokenType	TOKEN_TYPE enumerated type. TOKEN_QUERY access is needed to retrieve this information.
TokenImpersonationLevel	SECURITY_IMPERSONATION_LEVEL enumerated type. TOKEN_QUERY access is needed to retrieve this information about a token. If the access token is not an impersonation token, the function fails.
TokenStatistics	TOKEN_STATISTICS structure. TOKEN_QUERY access is needed to retrieve this information.

The formats for the retrieved structures and enumerated types are listed in the following Remarks section.

TokenInformationLength

Specifies the size, in bytes, of the buffer pointed to by the TokenInformation parameter.

ReturnLength

Points to a variable receiving the actual number of bytes needed for the buffer pointed to by the TokenInformation parameter. If this value is larger than the value specified in the TokenInformationLength parameter, the function fails and stores no data in the buffer.

If the value of the TokenInformationClass parameter is TokenDefaultDacl and the token has no default access-control list, the function sets the variable pointed to by ReturnLength to zero and stores no data in the buffer.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

See Also

AdjustTokenGroups, AdjustTokenPrivileges, OpenProcessToken, OpenThreadToken, SetTokenInformation, SECURITY_IMPERSONATION_LEVEL, TOKEN_DEFAULT_DACL, TOKEN_GROUPS, TOKEN_INFORMATION_CLASS, TOKEN_OWNER, TOKEN_PRIMARY_GROUP, TOKEN_PRIVILEGES, TOKEN_SOURCE, TOKEN_STATISTICS, TOKEN_TYPE, TOKEN_USER

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