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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, 9:13 a.m. CDT, <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="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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<p>On June 20th, 2014, 4:19 a.m. CDT, <b>Alexander Traud</b> wrote:</p>
<blockquote style="margin-left: 1em; border-left: 2px solid #d0d0d0; padding-left: 10px;">
<pre style="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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<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;">Looking at where we use cfg->pvtfile above:
char *tmpprivate = ast_strlen_zero(cfg->pvtfile) ? cfg->certfile : cfg->pvtfile;
if (SSL_CTX_use_certificate_chain_file(cfg->ssl_ctx, cfg->certfile) == 0) {
if (!client) {
/* Clients don't need a certificate, but if its setup we can use it */
ast_verb(0, "SSL error loading cert file. <%s>\n", cfg->certfile);
cfg->enabled = 0;
SSL_CTX_free(cfg->ssl_ctx);
cfg->ssl_ctx = NULL;
return 0;
}
}
So yes, if this is a TLS server and if cfg->pvtfile is specified, we will emit an error.
However, if this is a client, we won't emit any error if the pvtfile is specified but cannot be opened. Since in your case a client could specify a pvtfile and the open could fail (again) when BIO_new_file is called, a warning message at least is appropriate. The user configured Asterisk to use a private key file and we failed to access it. Telling them that they have a configuration error is a nice thing to do, as opposed to silently moving on.</pre>
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<p>- Matt</p>
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<p>On June 19th, 2014, 9:34 a.m. CDT, 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, 9:34 a.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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