iPECS SBG-1000 User Manual

iPECS SBG-1000 User Manual (DATA Features)
Figure 5.143 File Properties
Linux, on the other hand, has a very limited file permissions scheme, offering the basic Read (r),
Write (w) and Execute (x) permissions to the file owner and his group only. Access Control Lists
(ACLs) are an extension of the common Linux permission scheme. ACLs allow granting the
aforementioned permissions not only to the file owner and his group, but to any number of users
and groups. The need for ACLs in iPECS SBG-1000 is mainly to support permissions defined by a
Windows client connected to the file server. This connection is done via the ‘Microsoft File and
Printer Sharing Protocol’, which is supported on iPECS SBG-1000 and allows interoperability
between Linux/Unix servers and Windows-based clients. The basic user and group file
permissions in Windows are: Full control, Modify, Read and Execute, Read, and Write. Each
permission can be allowed or denied. Linux supports Read, Write and Execute only, and does not
support the Allow/Deny mechanism. When you modify a file’s permissions on a Windows client,
iPECS SBG-1000 uses a “best effort” algorithm to translate the ACLs to Linux r/w/x bits, making
the file compatible with Linux clients.
To view a file’s access control list on a Windows client connected to iPECS SBG-1000’s file server,
perform the following:
1. Click the file share link in the ‘File Server Shares’ section (see Figure 5.140) of the ‘File
Server’ screen to open the file share (login with a valid user for the share if a login prompt
appears).
2. Create a file on the share.
3. Right-click the file and choose “Properties”.
4. Click the Security tab to view the file ACLs (see Figure 5.143).
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