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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="auarf201.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="auarf203.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="HDRKPASSWD" HREF="auarf002.htm#ToC_216">kpasswd</A></H2>
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<A NAME="IDX5187"></A>
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<A NAME="IDX5188"></A>
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<A NAME="IDX5189"></A>
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<A NAME="IDX5190"></A>
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<A NAME="IDX5191"></A>
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<A NAME="IDX5192"></A>
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<A NAME="IDX5193"></A>
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<P><STRONG>Purpose</STRONG>
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<P>Changes the issuer's password in the Authentication Database
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<P><STRONG>Synopsis</STRONG>
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<PRE><B>kpasswd</B> [<B>-x</B>] [<B>-principal</B> <<VAR>user name</VAR>>] [<B>-password</B> <<VAR>user's password</VAR>>]
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[<B>-newpassword</B> <<VAR>user's new password</VAR>>] [<B>-cell</B> <<VAR>cell name</VAR>>]
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[<B>-servers</B> <<VAR>explicit list of servers</VAR>><SUP>+</SUP>] [<B>-pipe</B>] [<B>-help</B>]
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<B>kpasswd</B> [<B>-x</B>] [<B>-pr</B> <<VAR>user name</VAR>>] [<B>-pa</B> <<VAR>user's password</VAR>>]
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[<B>-n</B> <<VAR>user's new password</VAR>>] [<B>-c</B> <<VAR>cell name</VAR>>]
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[<B>-s</B> <<VAR>explicit list of servers</VAR>><SUP>+</SUP>] [<B>-pi</B>] [<B>-h</B>]
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</PRE>
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<P><STRONG>Description</STRONG>
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<P>The <B>kpasswd</B> command changes the password recorded in an
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Authentication Database entry. By default, the command interpreter
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changes the password for the AFS user name that matches the issuer's
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local identity (UNIX UID). To specify an alternate user, include the
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<B>-principal</B> argument. The user named by the
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<B>-principal</B> argument does not have to appear in the local password
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file (the <B>/etc/passwd</B> file or equivalent).
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<P>By default, the command interpreter sends the password change request to
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the Authentication Server running on one of the database server machines
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listed for the local cell in the <B>/usr/afs/etc/CellServDB</B> file on
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the local disk; it chooses the machine at random. It consults the
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<B>/usr/vice/etc/ThisCell</B> file on the local disk to learn the local
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cell name. To specify an alternate cell, include the <B>-cell</B>
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argument.
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<P>Unlike the UNIX <B>passwd</B> command, the <B>kpasswd</B> command
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does not restrict passwords to eight characters or less; it accepts
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passwords of virtually any length. All AFS commands that require
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passwords (including the <B>klog</B>, <B>kpasswd</B>, and AFS-modified
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login utilities, and the commands in the <B>kas</B> suite) accept
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passwords longer than eight characters, but some other applications and
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operating system utilities do not. Selecting an AFS password of eight
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characters or less enables the user to maintain matching AFS and UNIX
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passwords.
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<P>The command interpreter makes the following checks:
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<UL>
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<P><LI>If the program <B>kpwvalid</B> exists in the same directory as the
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<B>kpasswd</B> command, the command interpreter pass the new password to
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it for verification. For details, see the <B>kpwvalid</B> reference
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page.
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<P><LI>If the <B>-reuse</B> argument to the <B>kas setfields</B> command
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has been used to prohibit reuse of previous passwords, the command interpreter
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verifies that the password is not too similar too any of the user's
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previous 20 passwords. It generates the following error message at the
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shell:
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<PRE> Password was not changed because it seems like a reused password
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</PRE>
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<P>To prevent a user from subverting this restriction by changing the password
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twenty times in quick succession (manually or by running a script), use the
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<B>-minhours</B> argument on the <B>kaserver</B> initialization
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command. The following error message appears if a user attempts to
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change a password before the minimum time has passed:
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<PRE> Password was not changed because you changed it too
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recently; see your systems administrator
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</PRE>
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</UL>
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<P><STRONG>Options</STRONG>
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<DL>
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<P><DT><B>-x
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</B><DD>Appears only for backwards compatibility.
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<P><DT><B>-principal
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</B><DD>Names the Authentication Database entry for which to change the
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password. If this argument is omitted, the database entry with the same
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name as the issuer's local identity (UNIX UID) is changed.
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<P><DT><B>-password
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</B><DD>Specifies the current password. Omit this argument to have the
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command interpreter prompt for the password, which does not echo
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visibly:
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<PRE> Old password: <VAR>current_password</VAR>
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</PRE>
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<P><DT><B>-newpassword
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</B><DD>Specifies the new password, which the <B>kpasswd</B> command
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interpreter converts into an encryption key (string of octal numbers) before
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sending it to the Authentication Server for storage in the user's
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Authentication Database entry.
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<P>Omit this argument to have the command interpreter prompt for the password,
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which does not echo visibly:
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<PRE> New password (RETURN to abort): <VAR>new_password</VAR>
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Retype new password: <VAR>new_password</VAR>
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</PRE>
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<P><DT><B>-cell
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</B><DD>Specifies the cell in which to change the password, by directing the
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command to that cell's Authentication Servers. The issuer can
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abbreviate the cell name to the shortest form that distinguishes 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>By default, the command is executed in the local cell, as defined
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<UL>
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<P><LI>First, by the value of the environment variable AFSCELL
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<P><LI>Second, in the <B>/usr/vice/etc/ThisCell</B> file on the client
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machine on which the command is issued
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</UL>
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<P><DT><B>-servers
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</B><DD>Establishes a connection with the Authentication Server running on each
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specified machine, rather than with all of the database server machines listed
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for the relevant cell in the local copy of the
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<B>/usr/vice/etc/CellServDB</B> file. The <B>kpasswd</B>
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command interpreter then sends the password-changing request to one machine
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chosen at random from the set.
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<P><DT><B>-pipe
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</B><DD>Suppresses all output to the standard output stream or standard error
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stream. The <B>kpasswd</B> command interpreter expects to receive
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all necessary arguments, each on a separate line, from the standard input
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stream. Do not use this argument, which is provided for use by
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application programs rather than human users.
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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 example shows user <B>pat</B> changing her password in
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the ABC Corporation cell.
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<PRE> % <B>kpasswd</B>
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Changing password for 'pat' in cell 'abc.com'.
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Old password:
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New password (RETURN to abort):
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Verifying, please re-enter new_password:
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</PRE>
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<P><STRONG>Privilege Required</STRONG>
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<P>None
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<P><STRONG>Related Information</STRONG>
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<P><A HREF="auarf193.htm#HDRKAS_SETFIELDS">kas setfields</A>
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<P><A HREF="auarf194.htm#HDRKAS_SETPASSWORD">kas setpassword</A>
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<P><A HREF="auarf200.htm#HDRKLOG">klog</A>
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<P><A HREF="auarf203.htm#HDRKPWVALID">kpwvalid</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="auarf201.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="auarf203.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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<br>© <A HREF="http://www.ibm.com/">IBM Corporation 2000.</A> All Rights Reserved
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