// getInfo retrieves a specified type of information about an access token.
func getInfo(t syscall.Token, class uint32, initSize int) (unsafe.Pointer, error) {
b := make([]byte, initSize)
var n uint32
e := syscall.GetTokenInformation(t, class, &b[0], uint32(len(b)), &n)
if e != nil {
if e != syscall.ERROR_INSUFFICIENT_BUFFER {
return nil, e
}
// make receive buffers of requested size and try again
b = make([]byte, n)
e = syscall.GetTokenInformation(t, class, &b[0], uint32(len(b)), &n)
if e != nil {
return nil, e
}
}
return unsafe.Pointer(&b[0]), nil
}
// GetTokenPrivileges returns a list of privileges associated with a token.
// The provided token must have at a minimum TOKEN_QUERY access. This is a
// wrapper around the GetTokenInformation function.
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa446671(v=vs.85).aspx
func GetTokenPrivileges(token syscall.Token) (map[string]Privilege, error) {
// Determine the required buffer size.
var size uint32
syscall.GetTokenInformation(token, syscall.TokenPrivileges, nil, 0, &size)
// This buffer will receive a TOKEN_PRIVILEGE structure.
b := bytes.NewBuffer(make([]byte, size))
err := syscall.GetTokenInformation(token, syscall.TokenPrivileges, &b.Bytes()[0], uint32(b.Len()), &size)
if err != nil {
return nil, errors.Wrap(err, "GetTokenInformation failed")
}
var privilegeCount uint32
err = binary.Read(b, binary.LittleEndian, &privilegeCount)
if err != nil {
return nil, errors.Wrap(err, "failed to read PrivilegeCount")
}
rtn := make(map[string]Privilege, privilegeCount)
for i := 0; i < int(privilegeCount); i++ {
var luid int64
err = binary.Read(b, binary.LittleEndian, &luid)
if err != nil {
return nil, errors.Wrap(err, "failed to read LUID value")
}
var attributes uint32
err = binary.Read(b, binary.LittleEndian, &attributes)
if err != nil {
return nil, errors.Wrap(err, "failed to read attributes")
}
name, err := LookupPrivilegeName("", luid)
if err != nil {
return nil, errors.Wrapf(err, "LookupPrivilegeName failed for LUID=%v", luid)
}
rtn[name] = Privilege{
LUID: luid,
Name: name,
EnabledByDefault: (attributes & _SE_PRIVILEGE_ENABLED_BY_DEFAULT) > 0,
Enabled: (attributes & _SE_PRIVILEGE_ENABLED) > 0,
Removed: (attributes & _SE_PRIVILEGE_REMOVED) > 0,
Used: (attributes & _SE_PRIVILEGE_USED_FOR_ACCESS) > 0,
}
}
return rtn, nil
}