Verifica dell'autorizzazione della directory condivisa - C#

Question

Desidero scrivere un codice che controlli l'autorizzazione della directory condivisa, controllo più di una soluzione ma funziona correttamente quando provo ad ottenere i permessi della directory locale ma quando faccio dei test case per le directory condivise non riesce.

io cercando esempi in questa domanda: SOF: checking-for-directory-and-file-write-permissions-in-net

ma funziona solo su directory locali.

Per esempio, ho usato questa classe:

public class CurrentUserSecurity 
{ 
    WindowsIdentity _currentUser; 
    WindowsPrincipal _currentPrincipal; 

    public CurrentUserSecurity() 
    { 
     _currentUser = WindowsIdentity.GetCurrent(); 
     _currentPrincipal = new WindowsPrincipal(WindowsIdentity.GetCurrent()); 
    } 

    public bool HasAccess(DirectoryInfo directory, FileSystemRights right) 
    { 
     // Get the collection of authorization rules that apply to the directory. 
     AuthorizationRuleCollection acl = directory.GetAccessControl() 
      .GetAccessRules(true, true, typeof(SecurityIdentifier)); 
     return HasFileOrDirectoryAccess(right, acl); 
    } 

    public bool HasAccess(FileInfo file, FileSystemRights right) 
    { 
     // Get the collection of authorization rules that apply to the file. 
     AuthorizationRuleCollection acl = file.GetAccessControl() 
      .GetAccessRules(true, true, typeof(SecurityIdentifier)); 
     return HasFileOrDirectoryAccess(right, acl); 
    } 

    private bool HasFileOrDirectoryAccess(FileSystemRights right, 
              AuthorizationRuleCollection acl) 
    { 
     bool allow = false; 
     bool inheritedAllow = false; 
     bool inheritedDeny = false; 

     for (int i = 0; i < acl.Count; i++) 
     { 
      FileSystemAccessRule currentRule = (FileSystemAccessRule)acl[i]; 
      // If the current rule applies to the current user. 
      if (_currentUser.User.Equals(currentRule.IdentityReference) || 
       _currentPrincipal.IsInRole(
           (SecurityIdentifier)currentRule.IdentityReference)) 
      { 

       if (currentRule.AccessControlType.Equals(AccessControlType.Deny)) 
       { 
        if ((currentRule.FileSystemRights & right) == right) 
        { 
         if (currentRule.IsInherited) 
         { 
          inheritedDeny = true; 
         } 
         else 
         { // Non inherited "deny" takes overall precedence. 
          return false; 
         } 
        } 
       } 
       else if (currentRule.AccessControlType 
               .Equals(AccessControlType.Allow)) 
       { 
        if ((currentRule.FileSystemRights & right) == right) 
        { 
         if (currentRule.IsInherited) 
         { 
          inheritedAllow = true; 
         } 
         else 
         { 
          allow = true; 
         } 
        } 
       } 
      } 
     } 

     if (allow) 
     { // Non inherited "allow" takes precedence over inherited rules. 
      return true; 
     } 
     return inheritedAllow && !inheritedDeny; 
    } 
} 

E controllare il permesso di rappresentazione corrente sulla directory o file. Tutti i test case passano correttamente quando controllano la directory locale ma alcuni di essi falliscono nella directory condivisa che è il problema che voglio risolvere, quindi c'è qualche soluzione per questo?

Il banco di prova di seguito fallisce anche se la directory non ha avuto il permesso di scrittura:

 [TestMethod] 
    public void HasAccess_NotHaveAccess_ReturnsFalse() 
    { 
     CurrentUserSecurity cus = new CurrentUserSecurity(); 
     bool result = cus.HasAccess(new DirectoryInfo(@"\\sharedpc\readonly"), System.Security.AccessControl.FileSystemRights.Write); 
     Assert.AreEqual(result, false); 
    } 

Answer 1

Il codice WOMM. Vi incoraggio a capire perché le classi standard .NET non riescono (nel vostro ambiente) usando le API Win32 direttamente per scoprire eventuali potenziali problemi che il BCL sta nascondendo.

Incrocio le dita se si prova con questo metodo di livello inferiore che genera errori per darvi un'idea del problema con le classi BCL o utilizzarlo come soluzione temporanea.

using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Runtime.InteropServices; 

class MainConsole 
{ 
    [DllImport("Netapi32.dll", CharSet = CharSet.Unicode, SetLastError = true)] 
    static extern int NetShareGetInfo(
     [MarshalAs(UnmanagedType.LPWStr)] string serverName, 
     [MarshalAs(UnmanagedType.LPWStr)] string netName, 
     Int32 level, 
     out IntPtr bufPtr); 

    [DllImport("advapi32.dll", CharSet = CharSet.Unicode, SetLastError = true)] 
    [return: MarshalAs(UnmanagedType.Bool)] 
    static extern bool GetSecurityDescriptorDacl(
     IntPtr pSecurityDescriptor, 
     [MarshalAs(UnmanagedType.Bool)] out bool bDaclPresent, 
     ref IntPtr pDacl, 
     [MarshalAs(UnmanagedType.Bool)] out bool bDaclDefaulted 
     ); 

    [DllImport("advapi32.dll", CharSet = CharSet.Unicode, SetLastError = true)] 
    [return: MarshalAs(UnmanagedType.Bool)] 
    static extern bool GetAclInformation(
     IntPtr pAcl, 
     ref ACL_SIZE_INFORMATION pAclInformation, 
     uint nAclInformationLength, 
     ACL_INFORMATION_CLASS dwAclInformationClass 
    ); 

    [DllImport("advapi32.dll", CharSet = CharSet.Unicode, SetLastError = true)] 
    static extern int GetAce(
     IntPtr aclPtr, 
     int aceIndex, 
     out IntPtr acePtr 
    ); 

    [DllImport("advapi32.dll", CharSet = CharSet.Unicode, SetLastError = true)] 
    static extern int GetLengthSid(
     IntPtr pSID 
    ); 

    [DllImport("advapi32.dll", CharSet = CharSet.Unicode, SetLastError = true)] 
    [return: MarshalAs(UnmanagedType.Bool)] 
    static extern bool ConvertSidToStringSid(
     [MarshalAs(UnmanagedType.LPArray)] byte[] pSID, 
     out IntPtr ptrSid 
    ); 

    [DllImport("netapi32.dll", CharSet = CharSet.Unicode, SetLastError = true)] 
    static extern int NetApiBufferFree(
     IntPtr buffer 
    ); 

    enum SID_NAME_USE 
    { 
     SidTypeUser = 1, 
     SidTypeGroup, 
     SidTypeDomain, 
     SidTypeAlias, 
     SidTypeWellKnownGroup, 
     SidTypeDeletedAccount, 
     SidTypeInvalid, 
     SidTypeUnknown, 
     SidTypeComputer 
    } 

    [DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)] 
    static extern bool LookupAccountSid(
     string lpSystemName, 
     [MarshalAs(UnmanagedType.LPArray)] byte[] Sid, 
     System.Text.StringBuilder lpName, 
     ref uint cchName, 
     System.Text.StringBuilder ReferencedDomainName, 
     ref uint cchReferencedDomainName, 
     out SID_NAME_USE peUse); 

    [StructLayout(LayoutKind.Sequential)] 
    struct SHARE_INFO_502 
    { 
     [MarshalAs(UnmanagedType.LPWStr)] 
     public string shi502_netname; 
     public uint shi502_type; 
     [MarshalAs(UnmanagedType.LPWStr)] 
     public string shi502_remark; 
     public Int32 shi502_permissions; 
     public Int32 shi502_max_uses; 
     public Int32 shi502_current_uses; 
     [MarshalAs(UnmanagedType.LPWStr)] 
     public string shi502_path; 
     public IntPtr shi502_passwd; 
     public Int32 shi502_reserved; 
     public IntPtr shi502_security_descriptor; 
    } 

    [StructLayout(LayoutKind.Sequential)] 
    struct ACL_SIZE_INFORMATION 
    { 
     public uint AceCount; 
     public uint AclBytesInUse; 
     public uint AclBytesFree; 
    } 

    [StructLayout(LayoutKind.Sequential)] 
    public struct ACE_HEADER 
    { 
     public byte AceType; 
     public byte AceFlags; 
     public short AceSize; 
    } 

    [StructLayout(LayoutKind.Sequential)] 
    struct ACCESS_ALLOWED_ACE 
    { 
     public ACE_HEADER Header; 
     public int Mask; 
     public int SidStart; 
    } 

    enum ACL_INFORMATION_CLASS 
    { 
     AclRevisionInformation = 1, 
     AclSizeInformation 
    } 



    static void Main(string[] args) 
    { 
     IntPtr bufptr = IntPtr.Zero; 
     int err = NetShareGetInfo("ServerName", "ShareName", 502, out bufptr); 
     if (0 == err) 
     { 
      SHARE_INFO_502 shareInfo = (SHARE_INFO_502)Marshal.PtrToStructure(bufptr, typeof(SHARE_INFO_502)); 

      bool bDaclPresent; 
      bool bDaclDefaulted; 
      IntPtr pAcl = IntPtr.Zero; 
      GetSecurityDescriptorDacl(shareInfo.shi502_security_descriptor, out bDaclPresent, ref pAcl, out bDaclDefaulted); 
      if (bDaclPresent) 
      { 
       ACL_SIZE_INFORMATION AclSize = new ACL_SIZE_INFORMATION(); 
       GetAclInformation(pAcl, ref AclSize, (uint)Marshal.SizeOf(typeof(ACL_SIZE_INFORMATION)), ACL_INFORMATION_CLASS.AclSizeInformation); 
       for (int i = 0; i < AclSize.AceCount; i++) 
       { 
        IntPtr pAce; 
        err = GetAce(pAcl, i, out pAce); 
        ACCESS_ALLOWED_ACE ace = (ACCESS_ALLOWED_ACE)Marshal.PtrToStructure(pAce, typeof(ACCESS_ALLOWED_ACE)); 

        IntPtr iter = (IntPtr)((long)pAce + (long)Marshal.OffsetOf(typeof(ACCESS_ALLOWED_ACE), "SidStart")); 
        byte[] bSID = null; 
        int size = (int)GetLengthSid(iter); 
        bSID = new byte[size]; 
        Marshal.Copy(iter, bSID, 0, size); 
        IntPtr ptrSid; 
        ConvertSidToStringSid(bSID, out ptrSid); 
        string strSID = Marshal.PtrToStringAuto(ptrSid); 

        Console.WriteLine("The details of ACE number {0} are: ", i+1); 

        StringBuilder name = new StringBuilder(); 
        uint cchName = (uint)name.Capacity; 
        StringBuilder referencedDomainName = new StringBuilder(); 
        uint cchReferencedDomainName = (uint)referencedDomainName.Capacity; 
        SID_NAME_USE sidUse; 

        LookupAccountSid(null, bSID, name, ref cchName, referencedDomainName, ref cchReferencedDomainName, out sidUse); 

        Console.WriteLine("Trustee Name: " + name); 
        Console.WriteLine("Domain Name: " + referencedDomainName); 

        if ((ace.Mask & 0x1F01FF) == 0x1F01FF) 
        { 
         Console.WriteLine("Permission: Full Control"); 
        } 
        else if ((ace.Mask & 0x1301BF) == 0x1301BF) 
        { 
         Console.WriteLine("Permission: READ and CHANGE"); 
        } 
        else if ((ace.Mask & 0x1200A9) == 0x1200A9) 
        { 
         Console.WriteLine("Permission: READ only"); 
        } 
        Console.WriteLine("SID: {0} \nHeader AceType: {1} \nAccess Mask: {2} \nHeader AceFlag: {3}", strSID, ace.Header.AceType.ToString(), ace.Mask.ToString(), ace.Header.AceFlags.ToString()); 
        Console.WriteLine("\n"); 
       } 
      } 
      err = NetApiBufferFree(bufptr); 
     } 
    } 
} 

REF: http://blogs.msdn.com/b/dsadsi/archive/2012/03/30/to-read-shared-permissions-of-a-server-resource-in-c-using-netsharegetinfo.aspx

Anche se è possibile, prova il vostro codice e questo codice su un'altra rete, perché sto pensando proprio qualche problema ambiente.