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Authorization Using NTFS and Share Permissions
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When you share resources, whether files, folders, or printers, you need to pay attention to two sets of security configurations First, you should review the New Technology File System (NTFS) permissions that are assigned to the resource you are sharing NTFS access control lists (ACLs) are the best way to manage authorization, setting the level of access per security group and per account To view and adjust NTFS permissions, rightclick the file or folder of interest, and choose Properties from the pop-up menu; then select the Security tab at the top of the properties window You have a great many options for configuring access in the default security window, and you can click the Advanced button (as shown in Figure 7-1) for even more granular options The other way that security is applied to a shared resource is through the share itself In addition to the NTFS permissions, you can configure share permissions that will authenticate a user Regardless of what a user is authorized to access in NTFS permissions, a user will not have access to anything, unless the share itself is configured to authenticate the user You can modify share permissions remotely if you have been granted full control (which administrators have by default) For other users, you must modify permissions using an account that is logged on locally and has full control over the resource To modify a share, right-click the resource and select Share from the pop-up menu Click Change Sharing Permissions and then choose an account or group to add or remove, and click Add You can set the account s access using the toggle in the Permissions column
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Figure 7-1 Use NTFS permissions to manage authorization levels
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You have a few options when setting permissions: Reader Allows the user or group to view resources Contributor Allows the user or group to view and add resources Co-Owner Allows the user or group to view, add, and edit resources Remove Removes the user or group from the permissions set, disabling explicit access to shared resources
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After adding a user or group and configuring permissions in the Permissions column, click the Share button at the bottom of the share window when finished NOTE Leave the default share permissions in place in most cases NTFS should be the primary way in which you manage authorization for any resource
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You can share your files with all the users across your network or with selected users on the same computer When sharing files from your local computer, you have two options You can share from Vista s default public folders or from another folder anywhere on your hard disk drive
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To share files on a network, one Vista-only option is to copy or move the files that you want to share into your Public folder (similar to the Shared Documents folder in Windows XP) To access the Public folder on your computer: 1 From the Start menu, open the Documents folder If only the Favorite Links are displayed, click the Folders button 2 On the left folder pane, scroll down to almost the bottom of the list of components and folders, and then click the Public folder icon in the navigation pane to display all subfolders within the Public folder on your computer This is shown in Figure 7-2
Figure 7-2 Use Vista s Public folder to quickly share files
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Vista creates six default subfolders within your Public folder: Public Documents, Public Downloads, Public Music, Public Pictures, and Public Videos You can enable sharing of these public folders using the Network And Sharing Center applet in Control Panel Once you open the applet, find the Sharing And Discovery section in the center of the window Note the status for sharing files, printers, media, and public folder sharing Turn on any sharing features you need Once you turn sharing on, Vista automatically configures the Windows Firewall for you The ports needed to pass sharing traffic are enabled automatically When activating public folder sharing, Vista also sets sharing permissions on your public folders By default, the Everyone group is given read permissions and the local Administrators group is given full-control permissions This is a good best-practice based approach to permissioning shares, but if you want to change them, navigate through Computer\ %SystemDrive%\Users and right-click the Public folder Select Sharing from the pop-up menu, and configure them according to your needs NOTE We will cover Windows Firewall in more detail in 10 However, you should be aware that enabling file and printer sharing will automatically configure Windows Firewall to open several services and their associated ports These include ICMP (ping), NetBIOS (UDP 137 and 138, TCP 139), SMB (TCP 445), and RPC (dynamic endpoint mapper)
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