AdjustTokenGroups

The AdjustTokenGroups function adjusts groups in the specified access token. TOKEN_ADJUST_GROUPS access is required to enable or disable groups in an access token.

BOOL AdjustTokenGroups(

HANDLE TokenHandle,	// handle to token that contains groups
BOOL ResetToDefault,	// flag for default settings
PTOKEN_GROUPS NewState,	// address of address of new group information
DWORD BufferLength,	// size of buffer for previous information
PTOKEN_GROUPS PreviousState,	// address of previous group information
PDWORD ReturnLength	// address of required buffer size
);

Parameters

TokenHandle

Identifies the access token containing the groups to be modified.

ResetToDefault

Specifies whether the groups are to be set to their default enabled and disabled states. If this value is TRUE, the groups are set to their default states and the NewState parameter is ignored. If this value is FALSE, the groups are set according to the information pointed to by the NewState parameter.

NewState

Points to a TOKEN_GROUPS structure containing the groups whose states are to be set. If the ResetToDefault parameter is FALSE, the function sets each of the groups to the value of that group's SE_GROUP_ENABLED flag in the TOKEN_GROUPS structure. If ResetToDefault is TRUE, this parameter is ignored.

BufferLength

Specifies the size, in bytes, of the buffer pointed to by the PreviousState parameter. This parameter can be NULL if the PreviousState parameter is NULL.

PreviousState

Points to a buffer receiving a TOKEN_GROUPS structure containing the previous state of any groups the function modifies. The token must be open for TOKEN_QUERY access to use this parameter. This parameter can be NULL.

If a buffer is specified but it does not contain enough space to receive the complete list of modified groups, no group states are changed and the function fails. In this case, the function sets the variable pointed to by the ReturnLength parameter to the number of bytes required to hold the complete list of modified groups.

ReturnLength

Points to a variable set by the function that contains the actual number of bytes needed for the buffer pointed to by the PreviousState parameter. This parameter can be NULL and is ignored if PreviousState is NULL.

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.

Remarks

The information retrieved in the PreviousState parameter is formatted as a TOKEN_GROUPS structure. This means a pointer to the buffer can be passed as the NewState parameter in a subsequent call to the AdjustTokenGroups function, restoring the original state of the groups.

The NewState parameter can list groups to be changed that are not present in the access token. This does not affect the successful modification of the groups in the token.

Mandatory groups cannot be disabled. They are identified by the SE_GROUP_MANDATORY flag in the TOKEN_GROUPS structure. If an attempt is made to disable any mandatory groups, AdjustTokenGroups fails and leaves the state of all groups unchanged.

See Also

AdjustTokenPrivileges, GetTokenInformation, OpenProcessToken, OpenThreadToken, SetTokenInformation, TOKEN_GROUPS

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