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a1a825a2fcd6b32bd63d40a0705ef68fcbf1ed16vboxsync - Copyright (C) 2004-2014 Internet Systems Consortium, Inc. ("ISC")
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a1a825a2fcd6b32bd63d40a0705ef68fcbf1ed16vboxsync<tr><th colspan="3" align="center"><span class="application">isc-hmac-fixup</span></th></tr>
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1edca85ede2f5073e962bf32fa2abe26f128f11avboxsync<p><span class="application">isc-hmac-fixup</span> — fixes HMAC keys generated by older versions of BIND</p>
a1a825a2fcd6b32bd63d40a0705ef68fcbf1ed16vboxsync<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>
bf798cb79ac0bda723591893603554df2c16ddc5vboxsync Versions of BIND 9 up to and including BIND 9.6 had a bug causing
bf798cb79ac0bda723591893603554df2c16ddc5vboxsync HMAC-SHA* TSIG keys which were longer than the digest length of the
bf798cb79ac0bda723591893603554df2c16ddc5vboxsync hash algorithm (i.e., SHA1 keys longer than 160 bits, SHA256 keys
bf798cb79ac0bda723591893603554df2c16ddc5vboxsync longer than 256 bits, etc) to be used incorrectly, generating a
bf798cb79ac0bda723591893603554df2c16ddc5vboxsync message authentication code that was incompatible with other DNS
bf798cb79ac0bda723591893603554df2c16ddc5vboxsync implementations.
bf798cb79ac0bda723591893603554df2c16ddc5vboxsync This bug has been fixed in BIND 9.7. However, the fix may
bf798cb79ac0bda723591893603554df2c16ddc5vboxsync cause incompatibility between older and newer versions of
bf798cb79ac0bda723591893603554df2c16ddc5vboxsync BIND, when using long keys. <span><strong class="command">isc-hmac-fixup</strong></span>
bf798cb79ac0bda723591893603554df2c16ddc5vboxsync modifies those keys to restore compatibility.
bf798cb79ac0bda723591893603554df2c16ddc5vboxsync To modify a key, run <span><strong class="command">isc-hmac-fixup</strong></span> and
bf798cb79ac0bda723591893603554df2c16ddc5vboxsync specify the key's algorithm and secret on the command line. If the
bf798cb79ac0bda723591893603554df2c16ddc5vboxsync secret is longer than the digest length of the algorithm (64 bytes
04f905599c3a63d4349a8584d7ca5b9e0a3c3b98vboxsync for SHA1 through SHA256, or 128 bytes for SHA384 and SHA512), then a
bf798cb79ac0bda723591893603554df2c16ddc5vboxsync new secret will be generated consisting of a hash digest of the old
bf798cb79ac0bda723591893603554df2c16ddc5vboxsync secret. (If the secret did not require conversion, then it will be
a1a825a2fcd6b32bd63d40a0705ef68fcbf1ed16vboxsync printed without modification.)
a1a825a2fcd6b32bd63d40a0705ef68fcbf1ed16vboxsync<a name="id2668954"></a><h2>SECURITY CONSIDERATIONS</h2>
a1a825a2fcd6b32bd63d40a0705ef68fcbf1ed16vboxsync Secrets that have been converted by <span><strong class="command">isc-hmac-fixup</strong></span>
a1a825a2fcd6b32bd63d40a0705ef68fcbf1ed16vboxsync are shortened, but as this is how the HMAC protocol works in
a3011b448b38c39a7222f2f1eb40c8349023f650vboxsync operation anyway, it does not affect security. RFC 2104 notes,
a3011b448b38c39a7222f2f1eb40c8349023f650vboxsync "Keys longer than [the digest length] are acceptable but the
a1a825a2fcd6b32bd63d40a0705ef68fcbf1ed16vboxsync extra length would not significantly increase the function
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2ad9f8a731c73f6ac74044d42d47bbaf6f44a566vboxsync<p><span class="corpauthor">Internet Systems Consortium</span>
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00331fbaff118e6a5077fe96327aca51a70459dbvboxsync<p style="text-align: center;">BIND 9.11.0pre-alpha</p>