1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
<html lang="en">
<head>
<title>NTP Symmetric Key</title>
<meta http-equiv="Content-Type" content="text/html">
<meta name="description" content="NTP Symmetric Key">
<meta name="generator" content="makeinfo 4.7">
<link title="Top" rel="top" href="#Top">
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
<meta http-equiv="Content-Style-Type" content="text/css">
<style type="text/css"><!--
pre.display { font-family:inherit }
pre.format { font-family:inherit }
pre.smalldisplay { font-family:inherit; font-size:smaller }
pre.smallformat { font-family:inherit; font-size:smaller }
pre.smallexample { font-size:smaller }
pre.smalllisp { font-size:smaller }
span.sc { font-variant:small-caps }
span.roman { font-family: serif; font-weight: normal; }
--></style>
</head>
<body>
<h1 class="settitle">NTP Symmetric Key</h1>
<div class="node">
<p><hr>
<a name="Top"></a>Next: <a rel="next" accesskey="n" href="#ntp_002ekeys-Description">ntp.keys Description</a>,
Previous: <a rel="previous" accesskey="p" href="#dir">(dir)</a>,
Up: <a rel="up" accesskey="u" href="#dir">(dir)</a>
<br>
</div>
<h2 class="unnumbered">NTP's Symmetric Key File User Manual</h2>
<p>This document describes the symmetric key file for the NTP Project's
<code>ntpd</code> program.
<p>This document applies to version 4.2.8p9 of <code>ntp.keys</code>.
<div class="shortcontents">
<h2>Short Contents</h2>
<ul>
<a href="#Top">NTP's Symmetric Key File User Manual</a>
</ul>
</div>
<ul class="menu">
<li><a accesskey="1" href="#ntp_002ekeys-Description">ntp.keys Description</a>
<li><a accesskey="2" href="#ntp_002ekeys-Notes">ntp.keys Notes</a>
</ul>
<div class="node">
<p><hr>
<a name="ntp_002ekeys-Description"></a>Previous: <a rel="previous" accesskey="p" href="#Top">Top</a>,
Up: <a rel="up" accesskey="u" href="#Top">Top</a>
<br>
</div>
<!-- node-name, next, previous, up -->
<h3 class="section">Description</h3>
<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>.
<div class="node">
<p><hr>
<a name="ntp_002ekeys-Notes"></a>
<br>
</div>
<h3 class="section">Notes about ntp.keys</h3>
<p><a name="index-ntp_002ekeys-1"></a><a name="index-NTP-symmetric-key-file-format-2"></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><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 65534
may be arbitrarily set in the keys file.
<p>The key file uses the same comment conventions
as the configuration file.
Key entries use a fixed format of the form
<pre class="example"> <kbd>keyno</kbd> <kbd>type</kbd> <kbd>key</kbd> <kbd>opt_IP_list</kbd>
</pre>
<p>where
<kbd>keyno</kbd>
is a positive integer (between 1 and 65534),
<kbd>type</kbd>
is the message digest algorithm,
and
<kbd>key</kbd>
is the key itself, and
<kbd>opt_IP_list</kbd>
is an optional comma-separated list of IPs
that are allowed to serve time.
If
<kbd>opt_IP_list</kbd>
is empty,
any properly-authenticated server message will be
accepted.
<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>What follows are some key types, and corresponding formats:
<dl>
<dt><code>MD5</code><dd>The key is 1 to 16 printable characters terminated by
an EOL,
whitespace,
or
a
<code>#</code>
(which is the "start of comment" character).
<br><dt><code>SHA</code><br><dt><code>SHA1</code><br><dt><code>RMD160</code><dd>The key is a hex-encoded ASCII string of 40 characters,
which is truncated as necessary.
</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>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>.
<ul class="menu">
<li><a accesskey="1" href="#ntp_002ekeys-Files">ntp.keys Files</a>: Files
<li><a accesskey="2" href="#ntp_002ekeys-See-Also">ntp.keys See Also</a>: See Also
<li><a accesskey="3" href="#ntp_002ekeys-Notes">ntp.keys Notes</a>: Notes
</ul>
<div class="node">
<p><hr>
<a name="ntp_002ekeys-Files"></a>Next: <a rel="next" accesskey="n" href="#ntp_002ekeys-See-Also">ntp.keys See Also</a>,
Up: <a rel="up" accesskey="u" href="#ntp_002ekeys-Notes">ntp.keys Notes</a>
<br>
</div>
<h4 class="subsection">ntp.keys Files</h4>
<dl>
<dt><span class="file">/etc/ntp.keys</span><dd>the default name of the configuration file
</dl>
<div class="node">
<p><hr>
<a name="ntp_002ekeys-See-Also"></a>Next: <a rel="next" accesskey="n" href="#ntp_002ekeys-Notes">ntp.keys Notes</a>,
Previous: <a rel="previous" accesskey="p" href="#ntp_002ekeys-Files">ntp.keys Files</a>,
Up: <a rel="up" accesskey="u" href="#ntp_002ekeys-Notes">ntp.keys Notes</a>
<br>
</div>
<h4 class="subsection">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>
<div class="node">
<p><hr>
<a name="ntp_002ekeys-Notes"></a>Previous: <a rel="previous" accesskey="p" href="#ntp_002ekeys-See-Also">ntp.keys See Also</a>,
Up: <a rel="up" accesskey="u" href="#ntp_002ekeys-Notes">ntp.keys Notes</a>
<br>
</div>
<h4 class="subsection">ntp.keys Notes</h4>
<p>This document was derived from FreeBSD.
</body></html>
|
