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John Terpstra
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@ -370,9 +370,250 @@ at how Samba helps to bridge the differences.
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<title>Share Definition Access Controls</title>
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<para>
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Explain here about the smb.conf [share] Access Control parameters, Mode and Mask parameters, force user/group, valid/invalid users, etc.
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The following parameters in the &smb.conf; file sections that define a share control or affect access controls.
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Before using any of the following options please refer to the man page for &smb.conf;.
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</para>
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<table frame='all'><title>User and Group Based Controls</title>
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<tgroup cols='2'>
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<thead>
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<row>
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<entry align="center">Control Parameter</entry>
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<entry align="center">Description - Action - Notes</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>admin users</entry>
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<entry><para>
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List of users who will be granted administrative privileges on the share.
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They will do all file operations as the super-user (root).
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Any user in this list will be able to do anything they like on the share,
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irrespective of file permissions.
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</para></entry>
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</row>
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<row>
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<entry>force group</entry>
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<entry><para>
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Specifies a UNIX group name that will be assigned as the default primary group
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for all users connecting to this service.
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</para></entry>
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</row>
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<row>
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<entry>force user</entry>
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<entry><para>
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Specifies a UNIX user name that will be assigned as the default user for all users connecting to this service.
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This is useful for sharing files. Incorrect use can cause security problems.
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</para></entry>
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</row>
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<row>
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<entry>guest ok</entry>
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<entry><para>
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If this parameter is set for a service, then no password is required to connect to the service. Privileges will be
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those of the guest account.
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</para></entry>
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</row>
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<row>
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<entry>invalid users</entry>
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<entry><para>
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List of users that should not be allowed to login to this service.
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</para></entry>
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</row>
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<row>
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<entry>only user</entry>
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<entry><para>
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Controls whether connections with usernames not in the user list will be allowed.
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</para></entry>
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</row>
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<row>
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<entry>read list</entry>
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<entry><para>
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List of users that are given read-only access to a service. Users in this list
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will not be given write access, no matter what the read only option is set to.
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</para></entry>
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</row>
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<row>
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<entry>username</entry>
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<entry><para>
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Refer to the &smb.conf; man page for more information - this is a complex and potentially misused parameter.
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</para></entry>
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</row>
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<row>
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<entry>valid users</entry>
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<entry><para>
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List of users that should be allowed to login to this service.
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</para></entry>
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</row>
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<row>
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<entry>write list</entry>
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<entry><para>
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List of users that are given read-write access to a service.
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</para></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<para>
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The following file and directory permission based controls, if misused, can result in considerable difficulty to
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diagnose the cause of mis-configuration. Use them sparingly and carefully. By gradually introducing each one by one
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undesirable side-effects may be detected. In the event of a problem, always comment all of them out and then gradually
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re-instroduce them in a controlled fashion.
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</para>
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<table frame='all'><title>File and Directory Permission Based Controls</title>
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<tgroup cols='2'>
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<thead>
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<row>
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<entry align="center">Control Parameter</entry>
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<entry align="center">Description - Action - Notes</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>create mask</entry>
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<entry><para>
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Refer to the &smb.conf; man page.
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</para></entry>
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</row>
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<row>
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<entry>directory mask</entry>
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<entry><para>
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The octal modes used when converting DOS modes to UNIX modes when creating UNIX directories.
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See also: directory security mask.
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</para></entry></row>
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<row>
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<entry>dos filemode</entry>
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<entry><para>
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Enabling this parameter allows a user who has write access to the file to modify the permissions on it.
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</para></entry>
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</row>
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<row>
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<entry>force create mode</entry>
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<entry><para>
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This parameter specifies a set of UNIX mode bit permissions that will always be set on a file created by Samba.
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</para></entry>
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</row>
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<row>
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<entry>force directory mode</entry>
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<entry><para>
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This parameter specifies a set of UNIX mode bit permissions that will always be set on a directory created by Samba.
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</para></entry>
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</row>
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<row>
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<entry>force directory security mode</entry>
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<entry><para>
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Controls UNIX permission bits modified when a Windows NT client is manipulating UNIX permissions on a directory
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</para></entry>
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</row>
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<row>
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<entry>force security mode</entry>
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<entry><para>
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Controls UNIX permission bits modified when a Windows NT client manipulates UNIX permissions.
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</para></entry>
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</row>
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<row>
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<entry>hide unreadable</entry>
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<entry><para>
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Prevents clients from seeing the existance of files that cannot be read.
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</para></entry>
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</row>
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<row>
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<entry>hide unwriteable files</entry>
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<entry><para>
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Prevents clients from seeing the existance of files that cannot be written to. Unwriteable directories are shown as usual.
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</para></entry>
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</row>
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<row>
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<entry>nt acl support</entry>
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<entry><para>
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This parameter controls whether smbd will attempt to map UNIX permissions into Windows NT access control lists.
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</para></entry>
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</row>
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<row>
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<entry>security mask</entry>
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<entry><para>
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Controls UNIX permission bits modified when a Windows NT client is manipulating the UNIX permissions on a file.
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</para></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<table frame='all'><title>Other Controls</title>
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<tgroup cols='2'>
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<thead>
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<row>
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<entry align="center">Control Parameter</entry>
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<entry align="center">Description - Action - Notes</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>case sensitive</entry>
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<entry><para>
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This means that all file name lookup will be done in a case sensitive manner.
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Files will be created with the precise filename Samba received from the MS Windows client.
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See also: default case, short preserve case.
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</para></entry>
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</row>
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<row>
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<entry>csc policy</entry>
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<entry><para>
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Client Side Caching Policy - parallels MS Windows client side file caching capabilities.
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</para></entry>
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</row>
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<row>
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<entry>dont descend</entry>
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<entry><para>
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Allows to specify a comma-delimited list of directories that the server should always show as empty.
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</para></entry>
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</row>
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<row>
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<entry>dos filetime resolution</entry>
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<entry><para>
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This option is mainly used as a compatibility option for Visual C++ when used against Samba shares.
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</para></entry>
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</row>
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<row>
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<entry>dos filetimes</entry>
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<entry><para>
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Under DOS and Windows, if a user can write to a file they can change the timestamp on it. Under POSIX semantics, only the
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owner of the file or root may change the timestamp. By default, Samba runs with POSIX semantics and refuses to change the
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timestamp on a file if the user smbd is acting on behalf of is not the file owner. Setting this option to yes allows DOS
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semantics and smbd(8) will change the file timestamp as DOS requires.
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</para></entry>
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</row>
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<row>
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<entry>fake oplocks</entry>
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<entry><para>
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Oplocks are the way that SMB clients get permission from a server to locally cache file operations. If a server grants an
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oplock (opportunistic lock) then the client is free to assume that it is the only one accessing the file and it will
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aggressively cache file data. With some oplock types the client may even cache file open/close operations.
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</para></entry>
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</row>
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<row>
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<entry>hide dot files, hide files, veto files</entry>
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<entry><para>
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Note: MS Windows Explorer allows over-ride of files marked as hidden so they will still be visible.
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</para></entry>
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</row>
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<row>
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<entry>read only</entry>
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<entry><para>
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If this parameter is yes, then users of a service may not create or modify files in the service's directory.
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</para></entry>
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</row>
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<row>
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<entry>veto files</entry>
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<entry><para>
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List of files and directories that are neither visible nor accessible.
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</para></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</sect1>
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<sect1>
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