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<TITLE>Administration Reference</TITLE>
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<A NAME="Top_Of_Page"></A>
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<H1>Administration Reference</H1>
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<HR><P ALIGN="center"> <A HREF="../index.htm"><IMG SRC="../books.gif" BORDER="0" ALT="[Return to Library]"></A> <A HREF="auarf002.htm#ToC"><IMG SRC="../toc.gif" BORDER="0" ALT="[Contents]"></A> <A HREF="auarf158.htm"><IMG SRC="../prev.gif" BORDER="0" ALT="[Previous Topic]"></A> <A HREF="#Bot_Of_Page"><IMG SRC="../bot.gif" BORDER="0" ALT="[Bottom of Topic]"></A> <A HREF="auarf160.htm"><IMG SRC="../next.gif" BORDER="0" ALT="[Next Topic]"></A> <A HREF="auarf284.htm#HDRINDEX"><IMG SRC="../index.gif" BORDER="0" ALT="[Index]"></A> <P>
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<P>
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<H2><A NAME="HDRFS_SETCELL" HREF="auarf002.htm#ToC_173">fs setcell</A></H2>
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<P><STRONG>Purpose</STRONG>
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<P>Allows or disallows running of setuid programs from specified cells
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<P><STRONG>Synopsis</STRONG>
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<PRE><B>fs setcell -cell</B> <<VAR>cell name</VAR>><SUP>+</SUP> [<B>-suid</B>] [<B>-nosuid</B>] [<B>-help</B>]
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<B>fs setce -c</B> <<VAR>cell name</VAR>><SUP>+</SUP> [<B>-s</B>] [<B>-n</B>] [<B>-h</B>]
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</PRE>
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<P><STRONG>Description</STRONG>
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<P>The <B>fs setcell</B> command sets whether the Cache Manager allows
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programs (and other executable files) from each cell named by the
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<B>-cell</B> argument to run with setuid permission. By default,
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the Cache Manager allows programs from its home cell to run with setuid
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permission, but not programs from any foreign cells. A program belongs
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to the same cell as the file server machine that houses the volume in which
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the program's binary file resides, as specified in the file server
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machine's <B>/usr/afs/etc/ThisCell</B> file. The Cache Manager
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determines its own home cell by reading the <B>/usr/vice/etc/ThisCell</B>
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file at initialization.
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<P>To enable programs from each specified cell to run with setuid permission,
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include the <B>-suid</B> flag. To prohibit programs from running
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with setuid permission, include the <B>-nosuid</B> flag, or omit both
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flags.
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<P>The <B>fs setcell</B> command directly alters a cell's setuid
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status as recorded in kernel memory, so rebooting the machine is
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unnecessary. However, non-default settings do not persist across
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reboots of the machine unless the appropriate <B>fs setcell</B> command
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appears in the machine's AFS initialization file.
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<P>To display a cell's setuid status, issue the <B>fs
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getcellstatus</B> command.
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<P><STRONG>Cautions</STRONG>
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<P>AFS does not recognize effective UID: if a setuid program accesses
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AFS files and directories, it does so using the current AFS identity of the
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AFS user who initialized the program, not of the program's owner.
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Only the local file system recognizes effective UID.
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<P>Only members of the <B>system:administrators</B> group can turn
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on the setuid mode bit on an AFS file or directory.
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<P>When the setuid mode bit is turned on, the UNIX <B>ls -l</B> command
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displays the third user mode bit as an <TT>s</TT> instead of an
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<TT>x</TT>. However, the <TT>s</TT> does not appear on an AFS file
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or directory unless setuid permission is enabled for the cell in which the
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file resides.
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<P><STRONG>Options</STRONG>
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<DL>
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<P><DT><B>-cell
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</B><DD>Names each cell for which to set setuid status. Provide the fully
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qualified domain name, or a shortened form that disambiguates it from the
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other cells listed in the local <B>/usr/vice/etc/CellServDB</B>
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file.
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<P><DT><B>-suid
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</B><DD>Allows programs from each specified cell to run with setuid
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privilege. Provide it or the <B>-nosuid</B> flag, or omit both
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flags to disallow programs from running with setuid privilege.
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<P><DT><B>-nosuid
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</B><DD>Prevents programs from each specified cell from running with setuid
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privilege. Provide it or the <B>-suid</B> flag, or omit both flags
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to disallow programs form running with setuid privilege.
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<P><DT><B>-help
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</B><DD>Prints the online help for this command. All other valid options
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are ignored.
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</DL>
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<P><STRONG>Examples</STRONG>
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<P>The following command enables executable files from the State University
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cell to run with setuid privilege on the local machine:
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<PRE> % <B>fs setcell -cell stateu.edu -suid</B>
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</PRE>
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<P><STRONG>Privilege Required</STRONG>
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<P>The issuer must be logged in as the local superuser <B>root</B>.
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<P><STRONG>Related Information</STRONG>
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<P><A HREF="auarf144.htm#HDRFS_GETCELLSTATUS">fs getcellstatus</A>
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<P>
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<HR><P ALIGN="center"> <A HREF="../index.htm"><IMG SRC="../books.gif" BORDER="0" ALT="[Return to Library]"></A> <A HREF="auarf002.htm#ToC"><IMG SRC="../toc.gif" BORDER="0" ALT="[Contents]"></A> <A HREF="auarf158.htm"><IMG SRC="../prev.gif" BORDER="0" ALT="[Previous Topic]"></A> <A HREF="#Top_Of_Page"><IMG SRC="../top.gif" BORDER="0" ALT="[Top of Topic]"></A> <A HREF="auarf160.htm"><IMG SRC="../next.gif" BORDER="0" ALT="[Next Topic]"></A> <A HREF="auarf284.htm#HDRINDEX"><IMG SRC="../index.gif" BORDER="0" ALT="[Index]"></A> <P>
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