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diff --git a/contrib/bind9/bin/tools/isc-hmac-fixup.html b/contrib/bind9/bin/tools/isc-hmac-fixup.html new file mode 100644 index 000000000000..8b70777cd792 --- /dev/null +++ b/contrib/bind9/bin/tools/isc-hmac-fixup.html @@ -0,0 +1,83 @@ +<!-- + - Copyright (C) 2010 Internet Systems Consortium, Inc. ("ISC") + - + - Permission to use, copy, modify, and/or distribute this software for any + - purpose with or without fee is hereby granted, provided that the above + - copyright notice and this permission notice appear in all copies. + - + - THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH + - REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + - AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, + - INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + - LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE + - OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + - PERFORMANCE OF THIS SOFTWARE. +--> +<!-- $Id: isc-hmac-fixup.html,v 1.4 2010-05-19 01:14:14 tbox Exp $ --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>isc-hmac-fixup</title> +<meta name="generator" content="DocBook XSL Stylesheets V1.71.1"> +</head> +<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en"> +<a name="man.isc-hmac-fixup"></a><div class="titlepage"></div> +<div class="refnamediv"> +<h2>Name</h2> +<p><span class="application">isc-hmac-fixup</span> — fixes HMAC keys generated by older versions of BIND</p> +</div> +<div class="refsynopsisdiv"> +<h2>Synopsis</h2> +<div class="cmdsynopsis"><p><code class="command">isc-hmac-fixup</code> {<em class="replaceable"><code>algorithm</code></em>} {<em class="replaceable"><code>secret</code></em>}</p></div> +</div> +<div class="refsect1" lang="en"> +<a name="id2543351"></a><h2>DESCRIPTION</h2> +<p> + Versions of BIND 9 up to and including BIND 9.6 had a bug causing + HMAC-SHA* TSIG keys which were longer than the digest length of the + hash algorithm (i.e., SHA1 keys longer than 160 bits, SHA256 keys + longer than 256 bits, etc) to be used incorrectly, generating a + message authentication code that was incompatible with other DNS + implementations. + </p> +<p> + This bug has been fixed in BIND 9.7. However, the fix may + cause incompatibility between older and newer versions of + BIND, when using long keys. <span><strong class="command">isc-hmac-fixup</strong></span> + modifies those keys to restore compatibility. + </p> +<p> + To modify a key, run <span><strong class="command">isc-hmac-fixup</strong></span> and + specify the key's algorithm and secret on the command line. If the + secret is longer than the digest length of the algorithm (64 bytes + for SHA1 through SHA256, or 128 bytes for SHA384 and SHA512), then a + new secret will be generated consisting of a hash digest of the old + secret. (If the secret did not require conversion, then it will be + printed without modification.) + </p> +</div> +<div class="refsect1" lang="en"> +<a name="id2543374"></a><h2>SECURITY CONSIDERATIONS</h2> +<p> + Secrets that have been converted by <span><strong class="command">isc-hmac-fixup</strong></span> + are shortened, but as this is how the HMAC protocol works in + operation anyway, it does not affect security. RFC 2104 notes, + "Keys longer than [the digest length] are acceptable but the + extra length would not significantly increase the function + strength." + </p> +</div> +<div class="refsect1" lang="en"> +<a name="id2543388"></a><h2>SEE ALSO</h2> +<p> + <em class="citetitle">BIND 9 Administrator Reference Manual</em>, + <em class="citetitle">RFC 2104</em>. + </p> +</div> +<div class="refsect1" lang="en"> +<a name="id2543405"></a><h2>AUTHOR</h2> +<p><span class="corpauthor">Internet Systems Consortium</span> + </p> +</div> +</div></body> +</html> |