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<h3>
Hal Murray 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/7ec3fd978fce4664fecfc2af123f2d9e1f30fc3a">7ec3fd97</a></strong>
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<span>by Hal Murray</span>
<i>at 2019-06-27T06:32:53Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Tweaks to alpn_select_cb
fix iteration - skip over length byte too
check for bogus input - possible buffer overrun
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<h4>1 changed file:</h4>
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<a href="#f2a76773af5c8626dfdd65c4c6ab3a967f644a4d">
ntpd/nts_server.c
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<h4>Changes:</h4>
<li id="f2a76773af5c8626dfdd65c4c6ab3a967f644a4d">
<a href="https://gitlab.com/NTPsec/ntpsec/commit/7ec3fd978fce4664fecfc2af123f2d9e1f30fc3a#f2a76773af5c8626dfdd65c4c6ab3a967f644a4d"><strong>ntpd/nts_server.c</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">@@ -56,15 +56,24 @@ static int alpn_select_cb(SSL *ssl,</td>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">arg</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="c"> <span class="k" style="font-weight: 600;">static</span> <span class="k" style="font-weight: 600;">const</span> <span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="kt" style="color: #458; font-weight: 600;">char</span> <span class="n" style="color: #333;">alpn</span><span class="p">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">{</span> <span class="mi" style="color: #099;">7</span><span class="p">,</span> <span class="sc" style="color: #d14;">'n'</span><span class="p">,</span> <span class="sc" style="color: #d14;">'t'</span><span class="p">,</span> <span class="sc" style="color: #d14;">'s'</span><span class="p">,</span> <span class="sc" style="color: #d14;">'k'</span><span class="p">,</span> <span class="sc" style="color: #d14;">'e'</span><span class="p">,</span> <span class="sc" style="color: #d14;">'/'</span><span class="p">,</span> <span class="sc" style="color: #d14;">'1'</span> <span class="p">};</span></span>
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<pre style="margin: 0;">-<span id="LC59" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="n" style="color: #333;">i</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="n" style="color: #333;">i</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">len</span></span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC61" class="line" lang="c"> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">void</span></span><span class="p"><span class="idiff">)</span></span><span class="n" style="color: #333;"><span class="idiff right">ssl</span></span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC62" class="line" lang="c"> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">void</span></span><span class="p"><span class="idiff">)</span></span><span class="n" style="color: #333;"><span class="idiff right">arg</span></span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="c"> <span class="n" style="color: #333;"><span class="idiff left">UNUSED_ARG</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ssl</span></span><span class="p"><span class="idiff right">)</span>;</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="c"> <span class="n" style="color: #333;"><span class="idiff left">UNUSED_ARG</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">arg</span></span><span class="p"><span class="idiff right">)</span>;</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC64" class="line" lang="c"> <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">inlen</span><span class="p">;</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">+=</span> <span class="n" style="color: #333;">in</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">])</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC65" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">in</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">]</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">alpn</span><span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="p">]</span> <span class="o" style="font-weight: 600;">&&</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">memcmp</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">in</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">],</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">alpn</span><span class="p">[</span><span class="mi" style="color: #099;">1</span><span class="p">],</span> <span class="n" style="color: #333;">alpn</span><span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="p">]))</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC66" class="line" lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">outlen</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">in</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">];</span></span>
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<pre style="margin: 0;">-<span id="LC67" class="line" lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">out</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">in</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">];</span></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="c"> <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">inlen</span><span class="p">;</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">+=</span> <span class="n" style="color: #333;">len</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="c"> <span class="n" style="color: #333;">len</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">in</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">]</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">;</span> <span class="cm" style="color: #998; font-style: italic;">/* includes length byte */</span></span>
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66
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="c"><span class="c" style="color: #998; font-style: italic;">#if 0</span></span>
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67
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="c"><span class="c" style="color: #998; font-style: italic;"> char foo[256];</span></span>
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68
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="c"><span class="c" style="color: #998; font-style: italic;"> strlcpy(foo, (const char*)in+i+1, len);</span></span>
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69
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="c"><span class="c" style="color: #998; font-style: italic;"> msyslog(LOG_DEBUG, "DEBUG: alpn_select_cb: %u, %u, %s", inlen-i, len, foo);</span></span>
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70
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="c"><span class="c" style="color: #998; font-style: italic;">#endif</span></span>
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71
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">len</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">inlen</span><span class="o" style="font-weight: 600;">-</span><span class="n" style="color: #333;">i</span><span class="p">)</span></span>
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72
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* bogus arg: length overlaps end of in buffer */</span></span>
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<td class="diff-line-num new new_line" data-linenumber="73" 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">
73
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">SSL_TLSEXT_ERR_ALERT_FATAL</span><span class="p">;</span></span>
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74
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">len</span> <span class="o" style="font-weight: 600;">==</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">alpn</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">memcmp</span><span class="p">(</span><span class="n" style="color: #333;">in</span><span class="o" style="font-weight: 600;">+</span><span class="n" style="color: #333;">i</span><span class="p">,</span> <span class="n" style="color: #333;">alpn</span><span class="p">,</span> <span class="n" style="color: #333;">len</span><span class="p">))</span> <span class="p">{</span></span>
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75
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">out</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">in</span><span class="o" style="font-weight: 600;">+</span><span class="n" style="color: #333;">i</span><span class="p">;</span></span>
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76
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">outlen</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">len</span><span class="p">;</span></span>
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68
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77
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">SSL_TLSEXT_ERR_OK</span><span class="p">;</span></span>
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69
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78
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="c"> <span class="p">}</span></span>
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70
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79
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="c"> <span class="p">}</span></span>
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