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<h3>
Eric S. Raymond pushed to branch master
at <a href="https://gitlab.com/NTPsec/ntpsec">NTPsec / ntpsec</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.com/NTPsec/ntpsec/-/commit/68f46247045ee38d1e12d76a2c4977fe45deaca3">68f46247</a></strong>
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<span>by James Browning</span>
<i>at 2020-09-02T23:32:39-07:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">plyib: also support == for packet hash check ...
Python 2.7.7 and 3.3 support hmac.compare_digest otherwise ==
the hmac function runs in slower but (in theory) immune to timing attacks
probably not practical when len and contents available to the machine
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<h4>1 changed file:</h4>
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<a href="#e0397ae65951b0adbbedbbb14a096009aaa63642">
pylib/packet.py
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<h4>Changes:</h4>
<li id="e0397ae65951b0adbbedbbb14a096009aaa63642">
<a href="https://gitlab.com/NTPsec/ntpsec/-/commit/68f46247045ee38d1e12d76a2c4977fe45deaca3#e0397ae65951b0adbbedbbb14a096009aaa63642"><strong>pylib/packet.py</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1765,6 +1765,10 @@ class Authenticator:</td>
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<pre style="margin: 0;"> <span id="LC1765" class="line" lang="python"> <span class="n" style="color: #333;">ntp</span><span class="p">.</span><span class="n" style="color: #333;">poly</span><span class="p">.</span><span class="n" style="color: #333;">polybytes</span><span class="p">(</span><span class="n" style="color: #333;">passwd</span><span class="p">),</span> <span class="n" style="color: #333;">keytype</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1766" class="line" lang="python"> <span class="k" style="font-weight: 600;">if</span> <span class="ow" style="font-weight: 600;">not</span> <span class="n" style="color: #333;">mac2</span><span class="p">:</span></span>
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<pre style="margin: 0;"> <span id="LC1767" class="line" lang="python"> <span class="k" style="font-weight: 600;">return</span> <span class="bp" style="color: #999;">False</span></span>
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<pre style="margin: 0;">-<span id="LC1768" class="line" lang="python"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">hmac</span><span class="p">.</span><span class="n" style="color: #333;">compare_digest</span><span class="p">(</span><span class="n" style="color: #333;">mac</span><span class="p">,</span> <span class="n" style="color: #333;">mac2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1768" class="line" lang="python"> <span class="c1" style="color: #998; font-style: italic;"># typically prefered to avoid timing attacks client-side (in theory)</span></span>
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<pre style="margin: 0;">+<span id="LC1769" class="line" lang="python"> <span class="k" style="font-weight: 600;">try</span><span class="p">:</span></span>
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<pre style="margin: 0;">+<span id="LC1770" class="line" lang="python"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">hmac</span><span class="p">.</span><span class="n" style="color: #333;">compare_digest</span><span class="p">(</span><span class="n" style="color: #333;">mac</span><span class="p">,</span> <span class="n" style="color: #333;">mac2</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;"># supported 2.7.7+ and 3.3+</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1771" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1771" class="line" lang="python"> <span class="k" style="font-weight: 600;">except</span> <span class="nb" style="color: #0086b3;">AttributeError</span><span class="p">:</span></span>
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<pre style="margin: 0;">+<span id="LC1772" class="line" lang="python"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">mac</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">mac2</span> <span class="c1" style="color: #998; font-style: italic;"># solves issue #666</span></span>
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<pre style="margin: 0;"> <span id="LC1773" class="line" lang="python"></span>
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<pre style="margin: 0;"> <span id="LC1774" class="line" lang="python"><span class="c1" style="color: #998; font-style: italic;"># end</span></span></pre>
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