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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/3647/">https://reviewboard.asterisk.org/r/3647/</a>
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<p style="margin-top: 0;">On June 19th, 2014, 2:13 p.m. UTC, <b>Matt Jordan</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/3647/diff/1/?file=59799#file59799line435" style="color: black; font-weight: bold; text-decoration: underline;">branches/12/main/tcptls.c</a>
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(Diff revision 1)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int __ssl_setup(struct ast_tls_config *cfg, int client)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="n">BIO</span> <span class="o">*</span><span class="n">bio</span> <span class="o">=</span> <span class="n">BIO_new_file</span><span class="p">(</span><span class="n">cfg</span><span class="o">-></span><span class="n">pvtfile</span><span class="p">,</span> <span class="s">"r"</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">bio</span> <span class="o">!=</span> <span class="nb">NULL</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="n">DH</span> <span class="o">*</span><span class="n">dh</span> <span class="o">=</span> <span class="n">PEM_read_bio_DHparams</span><span class="p">(</span><span class="n">bio</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">dh</span> <span class="o">!=</span> <span class="nb">NULL</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">SSL_CTX_set_tmp_dh</span><span class="p">(</span><span class="n">cfg</span><span class="o">-></span><span class="n">ssl_ctx</span><span class="p">,</span> <span class="n">dh</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="kt">long</span> <span class="n">options</span> <span class="o">=</span> <span class="n">SSL_OP_CIPHER_SERVER_PREFERENCE</span> <span class="o">|</span> <span class="n">SSL_OP_SINGLE_DH_USE</span> <span class="o">|</span> <span class="n">SSL_OP_SINGLE_ECDH_USE</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="n">options</span> <span class="o">=</span> <span class="n">SSL_CTX_set_options</span><span class="p">(</span><span class="n">cfg</span><span class="o">-></span><span class="n">ssl_ctx</span><span class="p">,</span> <span class="n">options</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="n">ast_verb</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="s">"SSL DH initialized, PFS cipher-suites enabled</span><span class="se">\n</span><span class="s">"</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="p">}</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="n">DH_free</span><span class="p">(</span><span class="n">dh</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="n">BIO_free</span><span class="p">(</span><span class="n">bio</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="p">}</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Given how tricky it is to set up TLS support, I'd go ahead and add an off nominal handler for BIO_new_file here. Something like:
if (bio != NULL) {
...
} else {
ast_log(LOG_WARNING, "Failed to open private key file %s: %s(%d)\n", cfg->pvtfile, strerror(errno), errno);
}</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">The private file was already opened (and used) some lines above. I am just re-using the reference.
The idea of this patch is to fail silently, when there are no DH parameters because those affect performance. Or stated differently, DH parameters are optional. Only administrators (who care) should enable it (and see success). Furthermore in Asterisk 12 chan_sip, the private file itself is optional. This is a bit different to pjsip were the TLS private file is mandatory.</pre>
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<p>- Alexander</p>
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<p>On June 19th, 2014, 2:34 p.m. UTC, Alexander Traud wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By Alexander Traud.</div>
<p style="color: grey;"><i>Updated June 19, 2014, 2:34 p.m.</i></p>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-23905">ASTERISK-23905</a>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
Asterisk
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">see Bugs</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>trunk/main/tcptls.c <span style="color: grey">(416071)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/3647/diff/" style="margin-left: 3em;">View Diff</a></p>
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