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GetTokenInformation info  Overview  Group

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

See also:


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