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<h3>
Ian Bruene pushed to branch master
at <a href="https://gitlab.com/NTPsec/ntpsec">NTPsec / ntpsec</a>
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<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/8c9f64298f78079cbe58345bc88de699295e61d8">8c9f6429</a></strong>
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<span>by Ian Bruene</span>
<i>at 2018-01-01T15:13:31-06:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fixed potential security vulnerability and added additional comments.
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<h4>1 changed file:</h4>
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<a href="#a61fb9541c7ffe95e3b809ea55001114580d13e4">
pylib/util.py
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<h4>Changes:</h4>
<li id="a61fb9541c7ffe95e3b809ea55001114580d13e4">
<a href="https://gitlab.com/NTPsec/ntpsec/commit/8c9f64298f78079cbe58345bc88de699295e61d8#a61fb9541c7ffe95e3b809ea55001114580d13e4"><strong>pylib/util.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">@@ -556,11 +556,17 @@ canonicalization_cache = Cache()</td>
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<pre style="margin: 0;"> <span id="LC556" class="line" lang="python"></span>
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<pre style="margin: 0;"> <span id="LC557" class="line" lang="python"><span class="kn" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">subprocess</span></span>
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<pre style="margin: 0;"> <span id="LC558" class="line" lang="python"></span>
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<pre style="margin: 0;">-<span id="LC559" class="line" lang="python"></span>
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<pre style="margin: 0;">+<span id="LC559" class="line" lang="python"><span class="c" style="color: #998; font-style: italic;"># Hack to avoid occasional multi-second long delays when doing a DNS</span></span>
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<pre style="margin: 0;">+<span id="LC560" class="line" lang="python"><span class="c" style="color: #998; font-style: italic;"># lookup. Delays of that length will cause the SNMP master agent to drop</span></span>
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<pre style="margin: 0;">+<span id="LC561" class="line" lang="python"><span class="c" style="color: #998; font-style: italic;"># the connection. Uaccceptable.</span></span>
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<pre style="margin: 0;">+<span id="LC562" class="line" lang="python"><span class="c" style="color: #998; font-style: italic;"># Unfortunately there is no good way to timeout a function in Python, so</span></span>
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<pre style="margin: 0;">+<span id="LC563" class="line" lang="python"><span class="c" style="color: #998; font-style: italic;"># we are left with one of the ugly options that happened to work.</span></span>
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<pre style="margin: 0;"> <span id="LC564" class="line" lang="python"><span class="k" style="font-weight: 600;">def</span> <span class="nf" style="color: #900; font-weight: 600;">timed_canonicalize_dns</span><span class="p">(</span><span class="n" style="color: #333;">inhost</span><span class="p">,</span> <span class="n" style="color: #333;">family</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">socket</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">AF_UNSPEC</span><span class="p">,</span> <span class="n" style="color: #333;">ttl</span><span class="o" style="font-weight: 600;">=</span><span class="mf" style="color: #099;">1.0</span><span class="p">):</span></span>
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<pre style="margin: 0;"> <span id="LC565" class="line" lang="python"> <span class="n" style="color: #333;">resname</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canonicalization_cache</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">get</span><span class="p">(</span><span class="n" style="color: #333;">inhost</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC566" class="line" lang="python"> <span class="k" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">resname</span> <span class="ow" style="font-weight: 600;">is</span> <span class="ow" style="font-weight: 600;">not</span> <span class="bp" style="color: #999;">None</span><span class="p">:</span></span>
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<pre style="margin: 0;"> <span id="LC567" class="line" lang="python"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">resname</span></span>
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<pre style="margin: 0;">+<span id="LC568" class="line" lang="python"> <span class="k" style="font-weight: 600;">if</span> <span class="s" style="color: #d14;">"'"</span> <span class="ow" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">inhost</span><span class="p">:</span> <span class="c" style="color: #998; font-style: italic;"># Invalid IP address that will break the function.</span></span>
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<pre style="margin: 0;">+<span id="LC569" class="line" lang="python"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">inhost</span> <span class="c" style="color: #998; font-style: italic;"># Potentially hostile.</span></span>
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<pre style="margin: 0;"> <span id="LC570" class="line" lang="python"> <span class="n" style="color: #333;">cmd</span> <span class="o" style="font-weight: 600;">=</span> <span class="s" style="color: #d14;">"import ntp.util; print(ntp.util.canonicalize_dns('</span><span class="si" style="color: #d14;">%</span><span class="s" style="color: #d14;">s', </span><span class="si" style="color: #d14;">%</span><span class="s" style="color: #d14;">s))"</span></span>
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565
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571
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<pre style="margin: 0;"> <span id="LC571" class="line" lang="python"> <span class="n" style="color: #333;">cmd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cmd</span> <span class="o" style="font-weight: 600;">%</span> <span class="p">(</span><span class="nb" style="color: #0086b3;">str</span><span class="p">(</span><span class="n" style="color: #333;">inhost</span><span class="p">),</span> <span class="nb" style="color: #0086b3;">str</span><span class="p">(</span><span class="n" style="color: #333;">family</span><span class="p">))</span></span>
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572
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<pre style="margin: 0;"> <span id="LC572" class="line" lang="python"> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">subprocess</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">Popen</span><span class="p">([</span><span class="s" style="color: #d14;">"python"</span><span class="p">,</span> <span class="s" style="color: #d14;">"-c"</span><span class="p">,</span> <span class="n" style="color: #333;">cmd</span><span class="p">],</span></span>
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