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API improvement: FileSystemShare: Added OnAccessRequest event that allows the subscriber to manage read / write permissions

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This commit is contained in:
Tal Aloni 2017-02-09 14:22:52 +02:00
parent f9ad9f9b5e
commit fd26380dab
16 changed files with 248 additions and 81 deletions
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60
SMBLibrary/Server/Helpers/NTFileSystemHelper.cs
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@ -20,10 +20,10 @@ namespace SMBLibrary.Server
public const int BytesPerSector = 512;
public const int ClusterSize = 4096;
public static NTStatus CreateFile(out FileSystemEntry entry, FileSystemShare share, string userName, string path, CreateDisposition createDisposition, CreateOptions createOptions, AccessMask desiredAccess, ConnectionState state)
public static NTStatus CreateFile(out FileSystemEntry entry, IFileSystem fileSystem, string path, AccessMask desiredAccess, CreateDisposition createDisposition, CreateOptions createOptions, ConnectionState state)
{
bool hasWriteAccess = share.HasWriteAccess(userName);
IFileSystem fileSystem = share.FileSystem;
FileAccess createAccess = ToCreateFileAccess(desiredAccess, createDisposition);
bool requestedWriteAccess = (createAccess & FileAccess.Write) > 0;
bool forceDirectory = (createOptions & CreateOptions.FILE_DIRECTORY_FILE) > 0;
bool forceFile = (createOptions & CreateOptions.FILE_NON_DIRECTORY_FILE) > 0;
@ -82,7 +82,7 @@ namespace SMBLibrary.Server
return NTStatus.STATUS_OBJECT_NAME_COLLISION;
}
if (!hasWriteAccess)
if (!requestedWriteAccess)
{
return NTStatus.STATUS_ACCESS_DENIED;
}
@ -132,7 +132,7 @@ namespace SMBLibrary.Server
return NTStatus.STATUS_OBJECT_PATH_NOT_FOUND;
}
if (!hasWriteAccess)
if (!requestedWriteAccess)
{
return NTStatus.STATUS_ACCESS_DENIED;
}
@ -173,7 +173,7 @@ namespace SMBLibrary.Server
createDisposition == CreateDisposition.FILE_OVERWRITE_IF ||
createDisposition == CreateDisposition.FILE_SUPERSEDE)
{
if (!hasWriteAccess)
if (!requestedWriteAccess)
{
return NTStatus.STATUS_ACCESS_DENIED;
}
@ -208,12 +208,6 @@ namespace SMBLibrary.Server
return NTStatus.STATUS_INVALID_PARAMETER;
}
FileAccess fileAccess = ToFileAccess(desiredAccess.File);
if (!hasWriteAccess && (fileAccess == FileAccess.Write || fileAccess == FileAccess.ReadWrite))
{
return NTStatus.STATUS_ACCESS_DENIED;
}
return NTStatus.STATUS_SUCCESS;
}
@ -395,6 +389,48 @@ namespace SMBLibrary.Server
}
}
public static FileAccess ToCreateFileAccess(AccessMask desiredAccess, CreateDisposition createDisposition)
{
FileAccess result = 0;
if ((desiredAccess.File & FileAccessMask.FILE_READ_DATA) > 0 ||
(desiredAccess.File & FileAccessMask.FILE_READ_EA) > 0 ||
(desiredAccess.File & FileAccessMask.FILE_READ_ATTRIBUTES) > 0 ||
(desiredAccess.File & FileAccessMask.MAXIMUM_ALLOWED) > 0 ||
(desiredAccess.File & FileAccessMask.GENERIC_ALL) > 0 ||
(desiredAccess.File & FileAccessMask.GENERIC_READ) > 0)
{
result |= FileAccess.Read;
}
if ((desiredAccess.File & FileAccessMask.FILE_WRITE_DATA) > 0 ||
(desiredAccess.File & FileAccessMask.FILE_APPEND_DATA) > 0 ||
(desiredAccess.File & FileAccessMask.FILE_WRITE_EA) > 0 ||
(desiredAccess.File & FileAccessMask.FILE_WRITE_ATTRIBUTES) > 0 ||
(desiredAccess.File & FileAccessMask.DELETE) > 0 ||
(desiredAccess.File & FileAccessMask.WRITE_DAC) > 0 ||
(desiredAccess.File & FileAccessMask.WRITE_OWNER) > 0 ||
(desiredAccess.File & FileAccessMask.MAXIMUM_ALLOWED) > 0 ||
(desiredAccess.File & FileAccessMask.GENERIC_ALL) > 0 ||
(desiredAccess.File & FileAccessMask.GENERIC_WRITE) > 0)
{
result |= FileAccess.Write;
}
if ((desiredAccess.Directory & DirectoryAccessMask.FILE_DELETE_CHILD) > 0)
{
result |= FileAccess.Write;
}
if (createDisposition == CreateDisposition.FILE_CREATE ||
createDisposition == CreateDisposition.FILE_SUPERSEDE)
{
result |= FileAccess.Write;
}
return result;
}
public static FileAccess ToFileAccess(FileAccessMask desiredAccess)
{
FileAccess result = 0;