: Changing File Permissions in .NET framework

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Example: Changing File Permissions
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Program 15-5 completes the collection of file security functions This function, ChangeFilePermissions, replaces the existing security descriptor with a new one, preserving the user and group SIDs but creating a new discretionary ACL
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Program 15-5 ChangeFilePermissions: Changing Security Attributes
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BOOL ChangeFilePermissions (DWORD fPm, LPCTSTR FNm, LPDWORD AceMsk) /* Change permissions in existing file Group is left unchanged */ { TCHAR UsrNm [ACCT_NAME_SIZE], GrpNm [ACCT_NAME_SIZE]; LPSECURITY_ATTRIBUTES pSA; PSECURITY_DESCRIPTOR pSD = NULL; HANDLE hSecHeap; if (_taccess (FNm, 0) != 0) return FALSE; ReadFilePermissions (FNm, UsrNm, GrpNm); pSA = InitializeUnixSA (fPm, UsrNm, GrpNm, AceMsk, &hSecHeap); pSD = pSA->lpSecurityDescriptor; SetFileSecurity (FileName, DACL_SECURITY_INFORMATION, pSD); HeapDestroy (hSecHeap); return TRUE; }
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Comments on the File Permissions
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When you're running these programs, it is interesting to monitor the file system using the Windows Explorer This utility cannot interpret the access-denied ACEs and will not be able to display the permissions The Windows NT 40 Explorer will generate an exception on encountering an access-denied ACE Using the access-denied ACEs is necessary, however, to emulate the UNIX semantics If they are omitted, the Windows Explorer can view the permissions A collection of permissions set with, for example, 0446 would then allow the user and group members to write to the file because Everyone can write to the file UNIX, however, does not act this way; it prevents the user and group members from writing to the file Also observe what happens when you try to create a secured file on a diskette or other FAT file system and when you run the program under Windows 9x
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Securing Kernel and Communication Objects
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The preceding sections were concerned mostly with file security, and the same techniques apply to other filelike objects, such as named pipes ( 11), and to kernel objects Program 15-6, the next example, deals with named pipes, which can be treated in much the same way as files were treated
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Securing Named Pipes
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While the code is omitted in the listing of Program 11-3, the server (whose full code appears on the book's Web site) optionally secures its named pipe to prevent access by unauthorized clients Optional command line parameters specify the user and group name Server [UserName GroupName]
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If the user and group names are omitted, default security is used Note that the full version of Program 11-3 (on the Web site) and Program 15-6 use techniques from Program 15-3 to create the optional security attributes However, rather than calling InitUnixSA, we now use a simpler function, InitializeAccessOnlySA, which only creates access allowed ACEs and puts a final access denied ACE at the end of the ACL Program 15-6 shows the relevant code sections that were not shown in Program 11-3 The important security rights for named pipes are as follows:
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FILE_GENERIC_READ FILE_GENERIC_WRITE SYNCHRONIZE (allowing a thread to wait on the pipe)
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Alternatively, simply use STANDARD_RIGHTS_REQUIRED, where all rights are required if the client is to connect You also need to mask in 0x1FF to obtain full access (duplex, inbound, outbound, and so on) The server in Program 15-6 optionally secures its named pipe instances using these rights Only clients executed by the owner have access, although it would be straightforward to allow group members to access the pipe as well
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Program 15-6 ServerNP: Securing a Named Pipe
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/* 15 ServerNP With named pipe security * Multithreaded command line server Named pipe version * Usage: Server [UserName GroupName] */ _tmain (int argc, LPTSTR argv []) { HANDLE hNp, hMonitor, hSrvrThread [MAX_CLIENTS]; DWORD iNp, MonitorId, ThreadId; DWORD AceMasks [] = /* Named pipe access rights */ {STANDARD_RIGHTS_REQUIRED | SYNCHRONIZE | 0X1FF, 0, 0 }; LPSECURITY_ATTRIBUTES pNPSA = NULL; if (argc == 4) /* Optional pipe security */ pNPSA = InitializeAccessOnlySA (0440, argv [1], argv [2], AceMasks, &hSecHeap);
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/* Create a pipe instance for every server thread */ for (iNp = 0; iNp < MAX_CLIENTS; iNp++) { hNp = CreateNamedPipe (SERVER_PIPE, PIPE_ACCESS_DUPLEX, PIPE_READMODE_MESSAGE | PIPE_TYPE_MESSAGE | PIPE_WAIT, MAX_CLIENTS, 0, 0, INFINITE, pNPSA); if (hNp == INVALID_HANDLE_VALUE) ReportError (_T ("Failure to open named pipe"), 1, TRUE); }
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