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Setting Sharing Options
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Click Options to select which protocols you will use. On this screen, simply select the check box for each protocol to enable it, as you can see in Figure 13 3. For the purposes of this discussion, we have selected SMB. Here you can also configure which users will have access to the SMB service.
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Samba
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Only enable SMB, as well as any of these services if you actually need them. When adding users to this list, you will be asked to enter a password (see Figure 13 4). The reason for this is that the respective user s password file must be modified to allow for an older style of password, which is used by the Samba Windows file-sharing engine.
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CHAPTER 13: File Services
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Figure 13 3. Defining an SMB/Windows user
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It s important to note that you are decreasing the overall security of your system by using the SMB service. Apple does not enable the storage of these weak passwords by default because dictionary attacking these older LAN Manager (LM MD4) passwords has been fairly simple. Any attacker who has gained root access to your system could view this weak password hash in your password file and potentially recover your login password. This might seem counterintuitive to worry about security concerns for someone with root access, but remember that even the root account cannot view a user s encrypted keychain file without knowing that user s password. Therefore, in this instance, if an attacker has gained complete control of the system, they could be able to decrypt files that are based on the user s login password, such as keychains or file vaulted home folders. NOTE: If you use the same password for all services, then compromising this password could lead to compromising the password for all of your services that use that same password. Once you are satisfied that your files and folders have an appropriate level of permissions assigned to them, it s time to turn to other protocols that computers will be using to access resources on your Mac. First on the list is the Samba protocol.
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CHAPTER 13: File Services
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Figure 13 4. Providing the password for a Windows user
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Once you have enabled a Windows user, then you will be able to connect to the system using SMB. To test this from a Mac, click the Go menu from the Finder, and select the Connect to a Server option. In the Connect to Server window (as shown in Figure 13 5), type smb:// followed by the IP address of the computer to which you are connecting. When you click Connect, you will be asked to enter the password and will be given a list of share points that have access through SMB. Make sure the user you are logged in as has access only to the locations that you want the user to be able to access.
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Figure 13 5. Connecting to an SMB share point
The SMB.conf File
From System Preferences, you may want to only share certain directories over Samba. By default, all shares are shared by any protocol enabled. Therefore, to only provide the least amount of privileges and access to any directory while still achieving your objectives, you will want to disable shares where possible. The SMB.conf file is a good place to look to see which SMB directories are being shared. The following is the basic/default smb.conf file for the Windows service:
Apress-MacBook-cedge:/private/etc cedge$ cat smb.conf [global] guest account = unknown
CHAPTER 13: File Services
encrypt passwords = yes auth methods = guest opendirectory passdb backend = opendirectorysam guest printer admin = @admin, @staff server string = 318 Administrator s iBook G4 unix charset = UTF-8-MAC display charset = UTF-8-MAC dos charset = 437 client ntlmv2 auth = no os level = 8 defer sharing violations = no vfs objects = darwin_acls brlm = yes workgroup = Workgroup ; Using the Computer Name to compute the NetBIOS name. netbios name = 318-Administrat use spnego = yes [homes] comment = User Home Directories browseable = no read only = no ;[public] ; path = /tmp ; public = yes ; only guest = yes ; writable = yes ; printable = no [printers] path = /tmp printable = yes
Review each section of the previous file. Make sure that any file shares (denoted between two [] symbols) have been planned and that the permissions are appropriate. Try to always disable guest access by changing the public variable to no. Try to always set the read only variable to yes, thus making many shares read-only. Also try to not make shares browseable unless otherwise required.
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