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@kazuki-ma

Windows ACE の AccessMask(マスク)ビットフラグの対応関係

More than 5 years have passed since last update.

Windows のアクセス権を示す ACL, ACE のビットフラグ位置と、
その名前の位置関係がわかりにくいので一覧にしています。

複数のフラグがついた汎用の名前があることや、ディレクトリ用とフォルダ用で別々の列挙体があることなどが見て取れます。

一覧表示のための PowerShell スクリプトも添付しました。


ListDirectory                  :        1  =                      1  =  0x00000001  ~  2^ 0
ReadData                       :        1  =                      1  =  0x00000001  ~  2^ 0
WriteData                      :        2  =                     10  =  0x00000002  ~  2^ 1
CreateFiles                    :        2  =                     10  =  0x00000002  ~  2^ 1
CreateDirectories              :        4  =                    100  =  0x00000004  ~  2^ 2
AppendData                     :        4  =                    100  =  0x00000004  ~  2^ 2
ReadExtendedAttributes         :        8  =                   1000  =  0x00000008  ~  2^ 3
WriteExtendedAttributes        :       16  =                  10000  =  0x00000010  ~  2^ 4
Traverse                       :       32  =                 100000  =  0x00000020  ~  2^ 5
ExecuteFile                    :       32  =                 100000  =  0x00000020  ~  2^ 5
DeleteSubdirectoriesAndFiles   :       64  =                1000000  =  0x00000040  ~  2^ 6
ReadAttributes                 :      128  =               10000000  =  0x00000080  ~  2^ 7
WriteAttributes                :      256  =              100000000  =  0x00000100  ~  2^ 8
Write                          :      278  =              100010110  =  0x00000116  ~  2^ 8
Delete                         :    65536  =      10000000000000000  =  0x00010000  ~  2^16
ReadPermissions                :   131072  =     100000000000000000  =  0x00020000  ~  2^17
Read                           :   131209  =     100000000010001001  =  0x00020089  ~  2^17
ReadAndExecute                 :   131241  =     100000000010101001  =  0x000200A9  ~  2^17
Modify                         :   197055  =     110000000110111111  =  0x000301BF  ~  2^17
ChangePermissions              :   262144  =    1000000000000000000  =  0x00040000  ~  2^18
TakeOwnership                  :   524288  =   10000000000000000000  =  0x00080000  ~  2^19
Synchronize                    :  1048576  =  100000000000000000000  =  0x00100000  ~  2^20
FullControl                    :  2032127  =  111110000000111111111  =  0x001F01FF  ~  2^20
foreach ($name in [enum]::GetNames([System.Security.AccessControl.FileSystemRights])) 
 { 
  $mask = [int][System.Security.AccessControl.FileSystemRights]$name;
  [String]::Format("{0,-30} : {1,8}  =  {2,21}  =  0x{1:X8}  ~  2^{3,2:0}", @(
     ($name ), # 名前
     ($mask), # 値
     ([System.Convert]::ToString(($mask), 2)), # 2進数文字列
     ([System.Math]::Log($mask,2) - 0.499) # 先頭ビット位置
     ))
 }
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kazuki-ma
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