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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/1173/">https://reviewboard.asterisk.org/r/1173/</a>
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<p style="margin-top: 0;">On May 25th, 2011, 3:29 p.m., <b>Tilghman Lesher</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1173/diff/6/?file=16640#file16640line11073" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_sip.c</a>
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(Diff revision 6)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void get_our_media_address(struct sip_pvt *p, int needvideo, int needtext,</pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">11073</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* set the key length based on INVITE or settings */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">ast_test_flag</span><span class="p">(</span><span class="n">srtp</span><span class="p">,</span> <span class="n">SRTP_CRYPTO_TAG_80</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="n">taglen</span> <span class="o">=</span> <span class="mi">80</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="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">ast_test_flag</span><span class="p">(</span><span class="o">&</span><span class="n">p</span><span class="o">-></span><span class="n">flags</span><span class="p">[</span><span class="mi">2</span><span class="p">],</span> <span class="n">SIP_PAGE3_SRTP_TAG_32</span><span class="p">)</span> <span class="o">||</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_test_flag</span><span class="p">(</span><span class="n">srtp</span><span class="p">,</span> <span class="n">SRTP_CRYPTO_TAG_32</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="n">taglen</span> <span class="o">=</span> <span class="mi">32</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="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;">Shouldn't you reverse these (i.e. prefer 32-bit taglen, if it's specified in the request, even if an 80-bit taglen is specified in the config file)?</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;">SRTP_CRYPTO_TAG_XX is set on INVITE request received
SIP_PAGE3_SRTP_TAG_32 is the config option ...
i should favor the request in response and only outbound INVITE should use the config option.
the above -
uses 80 ALWAYS in RESPONSE to INVITE when INVITE was 80
uses 32 ALWAYS in RESPONSE to INVITE when INVITE was 32
uses 80 for outbound INVITE when there is no config of 32.
please check i believe it is as you commented above.
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<p style="margin-top: 0;">On May 25th, 2011, 3:29 p.m., <b>Tilghman Lesher</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1173/diff/6/?file=16640#file16640line26223" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_sip.c</a>
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(Diff revision 6)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int handle_common_options(struct ast_flags *flags, struct ast_flags *mask, struct ast_variable *v)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">strcasecmp</span><span class="p">(</span><span class="n">v</span><span class="o">-></span><span class="n">name</span><span class="p">,</span> <span class="s">"encryption_taglen"</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="n">ast_set_flag</span><span class="p">(</span><span class="o">&</span><span class="n">mask</span><span class="p">[</span><span class="mi">2</span><span class="p">],</span> <span class="n">SIP_PAGE3_SRTP_TAG_32</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="n">ast_set2_flag</span><span class="p">(</span><span class="o">&</span><span class="n">flags</span><span class="p">[</span><span class="mi">2</span><span class="p">],</span> <span class="o">!</span><span class="n">strcasecmp</span><span class="p">(</span><span class="n">v</span><span class="o">-></span><span class="n">value</span><span class="p">,</span> <span class="s">"32"</span><span class="p">),</span> <span class="n">SIP_PAGE3_SRTP_TAG_32</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;">This new option needs corresponding documentation in configs/sip.conf.sample.</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;">Done.</pre>
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<blockquote style="margin-left: 1em; border-left: 2px solid #d0d0d0; padding-left: 10px;">
<p style="margin-top: 0;">On May 25th, 2011, 3:29 p.m., <b>Tilghman Lesher</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1173/diff/6/?file=16640#file16640line26230" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_sip.c</a>
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(Diff revision 6)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int handle_common_options(struct ast_flags *flags, struct ast_flags *mask, struct ast_variable *v)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">strcasecmp</span><span class="p">(</span><span class="n">v</span><span class="o">-></span><span class="n">value</span><span class="p">,</span> <span class="s">"try"</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="n">ast_set_flag</span><span class="p">(</span><span class="o">&</span><span class="n">flags</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">SIP_PAGE2_USE_SRTP</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">26232</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_set_flag</span><span class="p">(</span><span class="o">&</span><span class="n">flags</span><span class="p">[</span><span class="mi">2</span><span class="p">],</span> <span class="n">SIP_PAGE3_SRTP_TRY</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;">Document this in the config file, too.</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;">Done</pre>
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<blockquote style="margin-left: 1em; border-left: 2px solid #d0d0d0; padding-left: 10px;">
<p style="margin-top: 0;">On May 25th, 2011, 3:29 p.m., <b>Tilghman Lesher</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1173/diff/6/?file=16640#file16640line28908" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_sip.c</a>
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(Diff revision 6)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int process_crypto(struct sip_pvt *p, struct ast_rtp_instance *rtp, struct sip_srtp **srtp, const char *a)</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">sdp_crypto_process</span><span class="p">((</span><span class="o">*</span><span class="n">srtp</span><span class="p">)</span><span class="o">-></span><span class="n">crypto</span><span class="p">,</span> <span class="n">a</span><span class="p">,</span> <span class="n">rtp</span><span class="p">)</span> <span class="o"><</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">sdp_crypto_process</span><span class="p">((</span><span class="o">*</span><span class="n">srtp</span><span class="p">)</span><span class="o">-></span><span class="n">crypto</span><span class="p">,</span> <span class="n">a</span><span class="p">,</span> <span class="n">rtp</span><span class="p"><span class="hl">,</span></span><span class="hl"> </span><span class="p"><span class="hl">(</span></span><span class="o"><span class="hl">*</span></span><span class="n"><span class="hl">srtp</span></span><span class="p"><span class="hl">)</span>)</span> <span class="o"><</span> <span class="mi">0</span><span class="p">)</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;">The additional parentheses around *srtp are unnecessary (in the second case) when you're just passing the pointer.</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;">Done</pre>
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<blockquote style="margin-left: 1em; border-left: 2px solid #d0d0d0; padding-left: 10px;">
<p style="margin-top: 0;">On May 25th, 2011, 3:29 p.m., <b>Tilghman Lesher</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1173/diff/6/?file=16644#file16644line289" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/sip/sdp_crypto.c</a>
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(Diff revision 6)
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">int sdp_crypto_offer(struct sdp_crypto *p)</pre></td>
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<th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">286</font></th>
<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="kt">int</span> <span class="nf">sdp_crypto_offer</span><span class="p">(</span><span class="k">struct</span> <span class="n">sdp_crypto</span> <span class="o">*</span><span class="n">p</span><span class="p">)</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="kt">int</span> <span class="nf">sdp_crypto_offer</span><span class="p">(</span><span class="k">struct</span> <span class="n">sdp_crypto</span> <span class="o">*</span><span class="n">p</span><span class="p"><span class="hl">,</span></span><span class="kt"><span class="hl">int</span></span><span class="hl"> </span><span class="n"><span class="hl">taglen</span></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;">space after comma</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;">Done</pre>
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<p>- irroot</p>
<br />
<p>On May 26th, 2011, 2:59 a.m., irroot wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By irroot.</div>
<p style="color: grey;"><i>Updated 2011-05-26 02:59:41</i></p>
<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;">change the encruption option to tristate with optional bit setting
also make this a global option.
qwell sugests a second option for bitlen have no problem with that.
4.1 Crypto-suites
A crypto-suite value appears as the first parameter in a=crypto. The
CRYPTO-SUITE value MAY be different for SRTP and SRTCP as described
in Section 4.2. If a receiver does not support the particular
crypto-suite, then the receiver MUST NOT participate in the media
stream and SHOULD log an "unrecognized crypto-suite" condition
unless the receiver is participating in an Offer/Answer exchange
(Section 5). RTP/SAVP has four crypto-suites as described below.
4.1.1 AES_CM_128_HMAC_SHA1_80
This is the SRTP default AES Counter Mode cipher and HMAC-SHA1
message authentication having a 80-bit authentication tag. The
encryption and authentication key lengths are 128 bits. The master
salt value is 112 bits and the session salt value is 112 bits. The
PRF is the default SRTP pseudo-random function that uses AES Counter
Mode with a 128-bit key length.
4.1.2 AES_CM_128_HMAC_SHA1_32
The SRTP AES Counter Mode cipher is used with HMAC-SHA1 message
authentication having an 32-bit authentication tag. The encryption
and authentication key lengths are 128 bits. The master salt value
is 112 bits and the session salt value is 112 bits. These values
apply to SRTP and to SRTCP. The PRF is the default SRTP pseudo-
random function that uses AES Counter Mode with a 128-bit key
length.
4.1.3 F8_128_HMAC_SHA1_80
The SRTP f8 cipher is used with HMAC-SHA1 message authentication
having a 80-bit authentication tag. The encryption and
authentication key lengths are 128 bits. The master salt value is
112 bits and the session salt value is 112 bits. The PRF is the
default SRTP pseudo-random function that uses AES Counter Mode with
a 128-bit key length.
4.1.4 F8_128_HMAC_SHA1_32
The SRTP f8 cipher is used with HMAC-SHA1 message authentication
having a 32-bit authentication tag. The encryption and
authentication key lengths are 128 bits. The master salt value is
112 bits and the session salt value is 112 bits. The PRF is the
default SRTP pseudo-random function that uses AES Counter Mode with
a 128-bit key length. </pre>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/view.php?id=19335">19335</a>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/trunk/CHANGES <span style="color: grey">(320770)</span></li>
<li>/trunk/channels/chan_sip.c <span style="color: grey">(320770)</span></li>
<li>/trunk/channels/sip/include/sdp_crypto.h <span style="color: grey">(320770)</span></li>
<li>/trunk/channels/sip/include/sip.h <span style="color: grey">(320770)</span></li>
<li>/trunk/channels/sip/include/srtp.h <span style="color: grey">(320770)</span></li>
<li>/trunk/channels/sip/sdp_crypto.c <span style="color: grey">(320770)</span></li>
<li>/trunk/configs/sip.conf.sample <span style="color: grey">(320770)</span></li>
</ul>
<p><a href="https://reviewboard.asterisk.org/r/1173/diff/" style="margin-left: 3em;">View Diff</a></p>
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