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Now that we've narrowed connection rights down to an explicit community of client users and machines, we'll want to bind the set of operations permitted on file and directory objects contained within the share. This is accomplished by indicating whether a user has read or write privileges based on effective UNIX user and group identifiers, and how UNIX owner, group and world permissions are specified for manipulating files and directories. Keep in mind that Samba must honor UNIX permissions regardless of the parameter specifications designated for the share in smb.conf. Read/write permissions can be specified at the share level or user level using the readonly, read list, writeable, and write list parameters. If the user name is prefixed with an "@" sign or a "&" sign it is assumed to correspond to an NIS netgroup. If it is prefixed with a "+" sign, the name is checked against the UNIX group file. The "+" and "@"/"&" characters can be combined to indicate that a check be made against both UNIX groups file and NIS netgroups. writeable = <yes, no> write list = <comma separated user list> readonly = <yes, no> read list = <comma separated user list> Due to the wide range of access control attributes employed by DOS, LAN Manger, Windows 9x and Windows NT clients, Samba requires a set of mechanisms to ensure that these attributes are reflected in corresponding UNIX file and directory permissions. This is carefully achieved through a set of mask or mode (synonym for mask) parameters that guarantee appropriate application of UNIX permissions. There are two levels of masking that can be applied when a client creates a file or directory within a Samba file share. The first set of mask parameters are bit-wise AND'ed with the UNIX permission bits resulting from the mapping of DOS modes or NT access control attributes. Any bit not matching the mask will be removed from the resulting UNIX permission bits when the file or directory is created. The first-level mask parameters include create mask (DOS), directory mask (DOS), security mask (NT), and directory security mask (NT). Values for each of these parameters are designated as an octal mask: create mask = <default=0744> directory mask = <default=0755>
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security mask = <default=create mask> directory security mask = <default=directory mask> The next level of file and directory permission parameters allows you to force the setting of permission bits through bit-wise OR'ing with the results of the first level parameters. This ensures that certain owner, group and world permission bits will always be applied when a file or directory is created. Second-level parameters include force create mode (DOS), force directory mode (DOS), force security mode (NT), and force directory security mode (NT). Refer to the smb.conf (5) man page for additional information. force create mode = <default=000> force directory mode = <default=000> force security mode = <default=force create mode> force directory security mode = <default=force directory mode> In some instances you may want to force the assignment of a particular effective UNIX user or group to be used when operating on objects in the share. This is useful when multiple users are sharing access to a file share. By specifying a UNIX user name and group name as values to the force user and force group parameters, you can ensure that all file operations on the service will be performed using the named user and group for permissions checking and assignment: force user = <user name> force group = <group name> As of Samba 2.0.5, the force group parameter allows a "+" character to be added as a prefix to the group name value. What this means is that a connecting user only operates under the specified effective group if it is already listed as a member of that group in the /etc/groups file (Example 11.7). All other users will operate under their own default primary UNIX groups. Example 11.7 2.0.5 Force Group Enhancement force group = +sys Power users that require full administrative privileges for a share are designated with the admin users parameter. This basically gives these users root privileges when operating on files and directories within the share. admin users = <user list>
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