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1531.

guest ok = no

1532.

Finally, restart Samba for the new settings to take effect:

1533.

Now when connecting to the shared directories or printers you should be prompted for a username and password.

1534.

If you choose to map a network drive to the share you can check the <quote>Reconnect at Logon</quote> check box, which will require you to only enter the username and password once, at least until the password changes.

1535.

Share Security

1536.

There are several options available to increase the security for each individual shared directory. Using the <emphasis>[share]</emphasis> example, this section will cover some common options.

1537.

Groups

1538.

Groups define a collection of computers or users which have a common level of access to particular network resources and offer a level of granularity in controlling access to such resources. For example, if a group <emphasis role="italic">qa</emphasis> is defined and contains the users <emphasis role="italic">freda</emphasis>, <emphasis role="italic">danika</emphasis>, and <emphasis role="italic">rob</emphasis> and a second group <emphasis role="italic">support</emphasis> is defined and consists of users <emphasis role="italic">danika</emphasis>, <emphasis role="italic">jeremy</emphasis>, and <emphasis role="italic">vincent</emphasis> then certain network resources configured to allow access by the <emphasis role="italic">qa</emphasis> group will subsequently enable access by freda, danika, and rob, but not jeremy or vincent. Since the user <emphasis role="italic">danika</emphasis> belongs to both the <emphasis role="italic">qa</emphasis> and <emphasis role="italic">support</emphasis> groups, she will be able to access resources configured for access by both groups, whereas all other users will have only access to resources explicitly allowing the group they are part of.

1539.

By default Samba looks for the local system groups defined in <filename>/etc/group</filename> to determine which users belong to which groups. For more information on adding and removing users from groups see <xref linkend="adding-deleting-users"/>.

1540.

When defining groups in the Samba configuration file, <filename>/etc/samba/smb.conf</filename>, the recognized syntax is to preface the group name with an "@" symbol. For example, if you wished to define a group named <emphasis role="italic">sysadmin</emphasis> in a certain section of the <filename>/etc/samba/smb.conf</filename>, you would do so by entering the group name as <emphasis role="bold">@sysadmin</emphasis>.