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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ --> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>NTP Symmetric Key</title> <meta name="description" content="NTP Symmetric Key"> <meta name="keywords" content="NTP Symmetric Key"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> <link href="#Top" rel="start" title="Top"> <link href="dir.html#Top" rel="up" title="(dir)"> <style type="text/css"> <!-- a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} blockquote.smallindentedblock {margin-right: 0em; font-size: smaller} blockquote.smallquotation {font-size: smaller} div.display {margin-left: 3.2em} div.example {margin-left: 3.2em} div.lisp {margin-left: 3.2em} div.smalldisplay {margin-left: 3.2em} div.smallexample {margin-left: 3.2em} div.smalllisp {margin-left: 3.2em} kbd {font-style: oblique} pre.display {font-family: inherit} pre.format {font-family: inherit} pre.menu-comment {font-family: serif} pre.menu-preformatted {font-family: serif} pre.smalldisplay {font-family: inherit; font-size: smaller} pre.smallexample {font-size: smaller} pre.smallformat {font-family: inherit; font-size: smaller} pre.smalllisp {font-size: smaller} span.nolinebreak {white-space: nowrap} span.roman {font-family: initial; font-weight: normal} span.sansserif {font-family: sans-serif; font-weight: normal} ul.no-bullet {list-style: none} --> </style> </head> <body lang="en"> <h1 class="settitle" align="center">NTP Symmetric Key</h1> <a name="Top"></a> <div class="header"> <p> Next: <a href="#ntp_002ekeys-Description" accesskey="n" rel="next">ntp.keys Description</a>, Previous: <a href="dir.html#Top" accesskey="p" rel="prev">(dir)</a>, Up: <a href="dir.html#Top" accesskey="u" rel="up">(dir)</a> </p> </div> <a name="NTP_0027s-Symmetric-Key-File-User-Manual"></a> <h1 class="top">NTP’s Symmetric Key File User Manual</h1> <p>This document describes the symmetric key file for the NTP Project’s <code>ntpd</code> program. </p> <p>This document applies to version 4.2.8p15 of <code>ntp.keys</code>. </p> <a name="SEC_Overview"></a> <h2 class="shortcontents-heading">Short Table of Contents</h2> <div class="shortcontents"> <ul class="no-bullet"> <li><a name="stoc-Description" href="#toc-Description">1 Description</a></li> </ul> </div> <table class="menu" border="0" cellspacing="0"> <tr><td align="left" valign="top">• <a href="#ntp_002ekeys-Description" accesskey="1">ntp.keys Description</a>:</td><td> </td><td align="left" valign="top"> </td></tr> <tr><td align="left" valign="top">• <a href="#ntp_002ekeys-Notes" accesskey="2">ntp.keys Notes</a>:</td><td> </td><td align="left" valign="top"> </td></tr> </table> <hr> <a name="ntp_002ekeys-Description"></a> <div class="header"> <p> Previous: <a href="#Top" accesskey="p" rel="prev">Top</a>, Up: <a href="#Top" accesskey="u" rel="up">Top</a> </p> </div> <a name="Description"></a> <h2 class="chapter">1 Description</h2> <p>The name and location of the symmetric key file for <code>ntpd</code> can be specified in a configuration file, by default <code>/etc/ntp.keys</code>. </p> <table class="menu" border="0" cellspacing="0"> <tr><td align="left" valign="top">• <a href="#ntp_002ekeys-Notes" accesskey="1">ntp.keys Notes</a>:</td><td> </td><td align="left" valign="top"> </td></tr> </table> <hr> <a name="ntp_002ekeys-Notes"></a> <div class="header"> <p> Previous: <a href="#ntp_002ekeys-See-Also" accesskey="p" rel="prev">ntp.keys See Also</a>, Up: <a href="#ntp_002ekeys-Description" accesskey="u" rel="up">ntp.keys Description</a> </p> </div> <a name="Notes-about-ntp_002ekeys"></a> <h3 class="section">1.1 Notes about ntp.keys</h3> <a name="index-ntp_002ekeys"></a> <a name="index-NTP-symmetric-key-file-format"></a> <p>This document describes the format of an NTP symmetric key file. For a description of the use of this type of file, see the "Authentication Support" section of the <code>ntp.conf(5)</code> page. </p> <p><code>ntpd(8)</code> reads its keys from a file specified using the <code>-k</code> command line option or the <code>keys</code> statement in the configuration file. While key number 0 is fixed by the NTP standard (as 56 zero bits) and may not be changed, one or more keys numbered between 1 and 65535 may be arbitrarily set in the keys file. </p> <p>The key file uses the same comment conventions as the configuration file. Key entries use a fixed format of the form </p> <div class="example"> <pre class="example"><kbd>keyno</kbd> <kbd>type</kbd> <kbd>key</kbd> <kbd>opt_IP_list</kbd> </pre></div> <p>where <kbd>keyno</kbd> is a positive integer (between 1 and 65535), <kbd>type</kbd> is the message digest algorithm, <kbd>key</kbd> is the key itself, and <kbd>opt_IP_list</kbd> is an optional comma-separated list of IPs where the <kbd>keyno</kbd> should be trusted. that are allowed to serve time. Each IP in <kbd>opt_IP_list</kbd> may contain an optional <code>/subnetbits</code> specification which identifies the number of bits for the desired subnet of trust. If <kbd>opt_IP_list</kbd> is empty, any properly-authenticated message will be accepted. </p> <p>The <kbd>key</kbd> may be given in a format controlled by the <kbd>type</kbd> field. The <kbd>type</kbd> <code>MD5</code> is always supported. If <code>ntpd</code> was built with the OpenSSL library then any digest library supported by that library may be specified. However, if compliance with FIPS 140-2 is required the <kbd>type</kbd> must be either <code>SHA</code> or <code>SHA1</code>. </p> <p>What follows are some key types, and corresponding formats: </p> <dl compact="compact"> <dt><code>MD5</code></dt> <dd><p>The key is 1 to 16 printable characters terminated by an EOL, whitespace, or a <code>#</code> (which is the "start of comment" character). </p> </dd> <dt><code>SHA</code></dt> <dt><code>SHA1</code></dt> <dt><code>RMD160</code></dt> <dd><p>The key is a hex-encoded ASCII string of 40 characters, which is truncated as necessary. </p></dd> </dl> <p>Note that the keys used by the <code>ntpq(8)</code> and <code>ntpdc(8)</code> programs are checked against passwords requested by the programs and entered by hand, so it is generally appropriate to specify these keys in ASCII format. </p> <p>This section was generated by <strong>AutoGen</strong>, using the <code>agtexi-cmd</code> template and the option descriptions for the <code>ntp.keys</code> program. This software is released under the NTP license, <http://ntp.org/license>. </p> <table class="menu" border="0" cellspacing="0"> <tr><td align="left" valign="top">• <a href="#ntp_002ekeys-Files" accesskey="1">ntp.keys Files</a>:</td><td> </td><td align="left" valign="top">Files </td></tr> <tr><td align="left" valign="top">• <a href="#ntp_002ekeys-See-Also" accesskey="2">ntp.keys See Also</a>:</td><td> </td><td align="left" valign="top">See Also </td></tr> <tr><td align="left" valign="top">• <a href="#ntp_002ekeys-Notes" accesskey="3">ntp.keys Notes</a>:</td><td> </td><td align="left" valign="top">Notes </td></tr> </table> <hr> <a name="ntp_002ekeys-Files"></a> <div class="header"> <p> Next: <a href="#ntp_002ekeys-See-Also" accesskey="n" rel="next">ntp.keys See Also</a>, Up: <a href="#ntp_002ekeys-Notes" accesskey="u" rel="up">ntp.keys Notes</a> </p> </div> <a name="ntp_002ekeys-Files-1"></a> <h4 class="subsection">1.1.1 ntp.keys Files</h4> <dl compact="compact"> <dt><samp>/etc/ntp.keys</samp></dt> <dd><p>the default name of the configuration file </p></dd> </dl> <hr> <a name="ntp_002ekeys-See-Also"></a> <div class="header"> <p> Previous: <a href="#ntp_002ekeys-Files" accesskey="p" rel="prev">ntp.keys Files</a>, Up: <a href="#ntp_002ekeys-Notes" accesskey="u" rel="up">ntp.keys Notes</a> </p> </div> <a name="ntp_002ekeys-See-Also-1"></a> <h4 class="subsection">1.1.2 ntp.keys See Also</h4> <p><code>ntp.conf(5)</code>, <code>ntpd(1ntpdmdoc)</code>, <code>ntpdate(1ntpdatemdoc)</code>, <code>ntpdc(1ntpdcmdoc)</code>, <code>sntp(1sntpmdoc)</code> </p><hr> <div class="header"> <p> </p> </div> <a name="ntp_002ekeys-Notes-1"></a> <h4 class="subsection">1.1.3 ntp.keys Notes</h4> <p>This document was derived from FreeBSD. </p><hr> </body> </html>
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