1 <html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>SSLTAP</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="SSLTAP"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">SSLTAP</th></tr></table><hr></div><div class="refentry"><a name="ssltap"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ssltap — Tap into SSL connections and display the data going by </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="command">libssltap</code> [-vhfsxl] [-p port] [hostname:port]</p></div></div><div class="refsection"><a name="idm224680842512"></a><h2>STATUS</h2><p>This documentation is still work in progress. Please contribute to the initial review in <a class="ulink" href="https://bugzilla.mozilla.org/show_bug.cgi?id=836477" target="_top">Mozilla NSS bug 836477</a>
2 </p></div><div class="refsection"><a name="description"></a><h2>Description</h2><p>The SSL Debugging Tool <span class="command"><strong>ssltap</strong></span> is an SSL-aware command-line proxy. It watches TCP connections and displays the data going by. If a connection is SSL, the data display includes interpreted SSL records and handshaking</p></div><div class="refsection"><a name="options"></a><h2>Options</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term">-v </span></dt><dd><p>Print a version string for the tool.</p></dd><dt><span class="term">-h </span></dt><dd><p>
3 Turn on hex/ASCII printing. Instead of outputting raw data, the command interprets each record as a numbered line of hex values, followed by the same data as ASCII characters. The two parts are separated by a vertical bar. Nonprinting characters are replaced by dots.
4 </p></dd><dt><span class="term">-f </span></dt><dd><p>
5 Turn on fancy printing. Output is printed in colored HTML. Data sent from the client to the server is in blue; the server's reply is in red. When used with looping mode, the different connections are separated with horizontal lines. You can use this option to upload the output into a browser.
6 </p></dd><dt><span class="term">-s </span></dt><dd><p>
7 Turn on SSL parsing and decoding. The tool does not automatically detect SSL sessions. If you are intercepting an SSL connection, use this option so that the tool can detect and decode SSL structures.
9 If the tool detects a certificate chain, it saves the DER-encoded certificates into files in the current directory. The files are named cert.0x, where x is the sequence number of the certificate.
11 If the -s option is used with -h, two separate parts are printed for each record: the plain hex/ASCII output, and the parsed SSL output.
12 </p></dd><dt><span class="term">-x </span></dt><dd><p>
13 Turn on hex/ASCII printing of undecoded data inside parsed SSL records. Used only with the -s option.
14 This option uses the same output format as the -h option.
15 </p></dd><dt><span class="term">-l prefix</span></dt><dd><p>
16 Turn on looping; that is, continue to accept connections rather than stopping after the first connection is complete.
17 </p></dd><dt><span class="term">-p port</span></dt><dd><p>Change the default rendezvous port (1924) to another port.</p><p>The following are well-known port numbers:</p><p>
28 * IMAPS 993 (IMAP over SSL)
32 * NNTPS 563 (NNTP over SSL)
33 </p></dd></dl></div></div><div class="refsection"><a name="basic-usage"></a><h2>Usage and Examples</h2><p>
34 You can use the SSL Debugging Tool to intercept any connection information. Although you can run the tool at its most basic by issuing the ssltap command with no options other than hostname:port, the information you get in this way is not very useful. For example, assume your development machine is called intercept. The simplest way to use the debugging tool is to execute the following command from a command shell:
35 </p><pre class="programlisting">$ ssltap www.netscape.com</pre><p>
36 The program waits for an incoming connection on the default port 1924. In your browser window, enter the URL http://intercept:1924. The browser retrieves the requested page from the server at www.netscape.com, but the page is intercepted and passed on to the browser by the debugging tool on intercept. On its way to the browser, the data is printed to the command shell from which you issued the command. Data sent from the client to the server is surrounded by the following symbols: --> [ data ] Data sent from the server to the client is surrounded by the following symbols:
37 "left arrow"-- [ data ] The raw data stream is sent to standard output and is not interpreted in any way. This can result in peculiar effects, such as sounds, flashes, and even crashes of the command shell window. To output a basic, printable interpretation of the data, use the -h option, or, if you are looking at an SSL connection, the -s option. You will notice that the page you retrieved looks incomplete in the browser. This is because, by default, the tool closes down after the first connection is complete, so the browser is not able to load images. To make the tool
38 continue to accept connections, switch on looping mode with the -l option. The following examples show the output from commonly used combinations of options.
39 </p><p>Example 1 </p><pre class="programlisting">$ ssltap.exe -sx -p 444 interzone.mcom.com:443 > sx.txt</pre><p>Output </p><pre class="programlisting">
40 Connected to interzone.mcom.com:443
43 [ssl2] ClientHelloV2 {
44 version = {0x03, 0x00}
45 cipher-specs-length = 39 (0x27)
47 challenge-length = 16 (0x10)
50 (0x010080) SSL2/RSA/RC4-128/MD5
51 (0x020080) SSL2/RSA/RC4-40/MD5
52 (0x030080) SSL2/RSA/RC2CBC128/MD5
53 (0x040080) SSL2/RSA/RC2CBC40/MD5
54 (0x060040) SSL2/RSA/DES64CBC/MD5
55 (0x0700c0) SSL2/RSA/3DES192EDE-CBC/MD5
56 (0x000004) SSL3/RSA/RC4-128/MD5
57 (0x00ffe0) SSL3/RSA-FIPS/3DES192EDE-CBC/SHA
58 (0x00000a) SSL3/RSA/3DES192EDE-CBC/SHA
59 (0x00ffe1) SSL3/RSA-FIPS/DES64CBC/SHA
60 (0x000009) SSL3/RSA/DES64CBC/SHA
61 (0x000003) SSL3/RSA/RC4-40/MD5
62 (0x000006) SSL3/RSA/RC2CBC40/MD5
65 challenge = { 0xec5d 0x8edb 0x37c9 0xb5c9 0x7b70 0x8fe9 0xd1d3
72 0: 16 03 00 03 e5 |.....
78 type = 2 (server_hello)
79 length = 70 (0x000046)
81 server_version = {3, 0}
83 0: 77 8c 6e 26 6c 0c ec c0 d9 58 4f 47 d3 2d 01 45 |
85 10: 5c 17 75 43 a7 4c 88 c7 88 64 3c 50 41 48 4f 7f |
92 0: 14 11 07 a8 2a 31 91 29 11 94 40 37 57 10 a7 32 | ...¨*1.)..@7W.§2
93 10: 56 6f 52 62 fe 3d b3 65 b1 e4 13 0f 52 a3 c8 f6 | VoRbþ=³e±...R£È.
95 cipher_suite = (0x0003) SSL3/RSA/RC4-40/MD5
98 type = 11 (certificate)
99 length = 709 (0x0002c5)
101 chainlength = 706 (0x02c2)
104 data = { saved in file 'cert.001' }
108 type = 12 (server_key_exchange)
109 length = 202 (0x0000ca)
111 type = 14 (server_hello_done)
112 length = 0 (0x000000)
118 0: 16 03 00 00 44 |....D
119 type = 22 (handshake)
124 type = 16 (client_key_exchange)
125 length = 64 (0x000040)
134 0: 14 03 00 00 01 |.....
135 type = 20 (change_cipher_spec)
141 0: 16 03 00 00 38 |....8
142 type = 22 (handshake)
151 0: 14 03 00 00 01 |.....
152 type = 20 (change_cipher_spec)
160 0: 16 03 00 00 38 |....8
161 type = 22 (handshake)
170 0: 17 03 00 01 1f |.....
171 type = 23 (application_data)
179 0: 17 03 00 00 a0 |....
180 type = 23 (application_data)
189 0: 17 03 00 00 df |....ß
190 type = 23 (application_data)
197 0: 15 03 00 00 12 |.....
204 Server socket closed.
205 </pre><p>Example 2</p><p>
206 The -s option turns on SSL parsing. Because the -x option is not used in this example, undecoded values are output as raw data. The output is routed to a text file.
207 </p><pre class="programlisting">$ ssltap -s -p 444 interzone.mcom.com:443 > s.txt</pre><p>Output </p><pre class="programlisting">
208 Connected to interzone.mcom.com:443
211 [ssl2] ClientHelloV2 {
212 version = {0x03, 0x00}
213 cipher-specs-length = 36 (0x24)
214 sid-length = 0 (0x00)
215 challenge-length = 16 (0x10)
217 (0x010080) SSL2/RSA/RC4-128/MD5
218 (0x020080) SSL2/RSA/RC4-40/MD5
219 (0x030080) SSL2/RSA/RC2CBC128/MD5
220 (0x060040) SSL2/RSA/DES64CBC/MD5
221 (0x0700c0) SSL2/RSA/3DES192EDE-CBC/MD5
222 (0x000004) SSL3/RSA/RC4-128/MD5
223 (0x00ffe0) SSL3/RSA-FIPS/3DES192EDE-CBC/SHA
224 (0x00000a) SSL3/RSA/3DES192EDE-CBC/SHA
225 (0x00ffe1) SSL3/RSA-FIPS/DES64CBC/SHA
226 (0x000009) SSL3/RSA/DES64CBC/SHA
227 (0x000003) SSL3/RSA/RC4-40/MD5
230 challenge = { 0x713c 0x9338 0x30e1 0xf8d6 0xb934 0x7351 0x200c
235 type = 22 (handshake)
239 type = 2 (server_hello)
240 length = 70 (0x000046)
242 server_version = {3, 0}
248 cipher_suite = (0x0003) SSL3/RSA/RC4-40/MD5
250 type = 11 (certificate)
251 length = 709 (0x0002c5)
253 chainlength = 706 (0x02c2)
256 data = { saved in file 'cert.001' }
259 type = 12 (server_key_exchange)
260 length = 202 (0x0000ca)
261 type = 14 (server_hello_done)
262 length = 0 (0x000000)
268 type = 22 (handshake)
272 type = 16 (client_key_exchange)
273 length = 64 (0x000040)
282 type = 20 (change_cipher_spec)
287 type = 22 (handshake)
295 type = 20 (change_cipher_spec)
302 type = 22 (handshake)
310 type = 23 (application_data)
318 type = 23 (application_data)
326 type = 23 (application_data)
338 Server socket closed.
339 </pre><p>Example 3</p><p>
340 In this example, the -h option turns hex/ASCII format. There is no SSL parsing or decoding. The output is routed to a text file.
341 </p><pre class="programlisting">$ ssltap -h -p 444 interzone.mcom.com:443 > h.txt</pre><p>Output </p><pre class="programlisting">
342 Connected to interzone.mcom.com:443
344 0: 80 40 01 03 00 00 27 00 00 00 10 01 00 80 02 00 | .@....'.........
345 10: 80 03 00 80 04 00 80 06 00 40 07 00 c0 00 00 04 | .........@......
346 20: 00 ff e0 00 00 0a 00 ff e1 00 00 09 00 00 03 00 | ........á.......
347 30: 00 06 9b fe 5b 56 96 49 1f 9f ca dd d5 ba b9 52 | ..þ[V.I.\xd9 ...º¹R
351 0: 16 03 00 03 e5 02 00 00 46 03 00 7f e5 0d 1b 1d | ........F.......
352 10: 68 7f 3a 79 60 d5 17 3c 1d 9c 96 b3 88 d2 69 3b | h.:y`..<..³.Òi;
353 20: 78 e2 4b 8b a6 52 12 4b 46 e8 c2 20 14 11 89 05 | x.K.¦R.KFè. ...
354 30: 4d 52 91 fd 93 e0 51 48 91 90 08 96 c1 b6 76 77 | MR.ý..QH.....¶vw
355 40: 2a f4 00 08 a1 06 61 a2 64 1f 2e 9b 00 03 00 0b | *ô..¡.a¢d......
356 50: 00 02 c5 00 02 c2 00 02 bf 30 82 02 bb 30 82 02 | ..Å......0...0..
357 60: 24 a0 03 02 01 02 02 02 01 36 30 0d 06 09 2a 86 | $ .......60...*.
358 70: 48 86 f7 0d 01 01 04 05 00 30 77 31 0b 30 09 06 | H.÷......0w1.0..
359 80: 03 55 04 06 13 02 55 53 31 2c 30 2a 06 03 55 04 | .U....US1,0*..U.
360 90: 0a 13 23 4e 65 74 73 63 61 70 65 20 43 6f 6d 6d | ..#Netscape Comm
361 a0: 75 6e 69 63 61 74 69 6f 6e 73 20 43 6f 72 70 6f | unications Corpo
362 b0: 72 61 74 69 6f 6e 31 11 30 0f 06 03 55 04 0b 13 | ration1.0...U...
363 c0: 08 48 61 72 64 63 6f 72 65 31 27 30 25 06 03 55 | .Hardcore1'0%..U
364 d0: 04 03 13 1e 48 61 72 64 63 6f 72 65 20 43 65 72 | ....Hardcore Cer
365 e0: 74 69 66 69 63 61 74 65 20 53 65 72 76 65 72 20 | tificate Server
366 f0: 49 49 30 1e 17 0d 39 38 30 35 31 36 30 31 30 33 | II0...9805160103
367 <additional data lines>
369 <additional records in same format>
370 Server socket closed.
371 </pre><p>Example 4</p><p>
372 In this example, the -s option turns on SSL parsing, and the -h option turns on hex/ASCII format.
373 Both formats are shown for each record. The output is routed to a text file.
374 </p><pre class="programlisting">$ ssltap -hs -p 444 interzone.mcom.com:443 > hs.txt</pre><p>Output </p><pre class="programlisting">
375 Connected to interzone.mcom.com:443
377 0: 80 3d 01 03 00 00 24 00 00 00 10 01 00 80 02 00 | .=....$.........
378 10: 80 03 00 80 04 00 80 06 00 40 07 00 c0 00 00 04 | .........@......
379 20: 00 ff e0 00 00 0a 00 ff e1 00 00 09 00 00 03 03 | ........á.......
380 30: 55 e6 e4 99 79 c7 d7 2c 86 78 96 5d b5 cf e9 |U..yÇ\xb0 ,.x.]µÏé
382 [ssl2] ClientHelloV2 {
383 version = {0x03, 0x00}
384 cipher-specs-length = 36 (0x24)
385 sid-length = 0 (0x00)
386 challenge-length = 16 (0x10)
388 (0x010080) SSL2/RSA/RC4-128/MD5
389 (0x020080) SSL2/RSA/RC4-40/MD5
390 (0x030080) SSL2/RSA/RC2CBC128/MD5
391 (0x040080) SSL2/RSA/RC2CBC40/MD5
392 (0x060040) SSL2/RSA/DES64CBC/MD5
393 (0x0700c0) SSL2/RSA/3DES192EDE-CBC/MD5
394 (0x000004) SSL3/RSA/RC4-128/MD5
395 (0x00ffe0) SSL3/RSA-FIPS/3DES192EDE-CBC/SHA
396 (0x00000a) SSL3/RSA/3DES192EDE-CBC/SHA
397 (0x00ffe1) SSL3/RSA-FIPS/DES64CBC/SHA
398 (0x000009) SSL3/RSA/DES64CBC/SHA
399 (0x000003) SSL3/RSA/RC4-40/MD5
402 challenge = { 0x0355 0xe6e4 0x9979 0xc7d7 0x2c86 0x7896 0x5db
407 <additional records in same formats>
408 Server socket closed.
409 </pre></div><div class="refsection"><a name="usage-tips"></a><h2>Usage Tips</h2><p>
410 When SSL restarts a previous session, it makes use of cached information to do a partial handshake.
411 If you wish to capture a full SSL handshake, restart the browser to clear the session id cache.
413 If you run the tool on a machine other than the SSL server to which you are trying to connect,
414 the browser will complain that the host name you are trying to connect to is different from the certificate.
415 If you are using the default BadCert callback, you can still connect through a dialog. If you are not using
416 the default BadCert callback, the one you supply must allow for this possibility.
417 </p></div><div class="refsection"><a name="seealso"></a><h2>See Also</h2><p>The NSS Security Tools are also documented at <a class="ulink" href="http://www.mozilla.org/projects/security/pki/nss/tools" target="_top">http://www.mozilla.org/projects/security/pki/nss/</a>.</p></div><div class="refsection"><a name="resources"></a><h2>Additional Resources</h2><p>For information about NSS and other tools related to NSS (like JSS), check out the NSS project wiki at <a class="ulink" href="http://www.mozilla.org/projects/security/pki/nss/" target="_top">http://www.mozilla.org/projects/security/pki/nss/</a>. The NSS site relates directly to NSS code changes and releases.</p><p>Mailing lists: https://lists.mozilla.org/listinfo/dev-tech-crypto</p><p>IRC: Freenode at #dogtag-pki</p></div><div class="refsection"><a name="authors"></a><h2>Authors</h2><p>The NSS tools were written and maintained by developers with Netscape, Red Hat, Sun, Oracle, Mozilla, and Google.</p><p>
418 Authors: Elio Maldonado <emaldona@redhat.com>, Deon Lackey <dlackey@redhat.com>.
419 </p></div><div class="refsection"><a name="license"></a><h2>LICENSE</h2><p>Licensed under the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
420 </p></div></div><div class="navfooter"><hr></div></body></html>