tor-browser

index.rst (20856B)

---

.. _mozilla_projects_nss_tools_ssltap:

NSS tools : ssltap
==================

.. container::

  | Name
  |    ssltap — Tap into SSL connections and display the data going by
  | Synopsis
  |    libssltap [-vhfsxl] [-p port] [hostname:port]
  | Description
  |    The SSL Debugging Tool ssltap 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
  | Options
  |    -v
  |            Print a version string for the tool.
  |    -h
  |            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.
  |    -f
  |            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.
  |    -s
  |            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.
  |            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.
  |            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.
  |    -x
  |            Turn on hex/ASCII printing of undecoded data inside parsed SSL
  |            records. Used only with the -s option. This option uses the same
  |            output format as the -h option.
  |    -l prefix
  |            Turn on looping; that is, continue to accept connections rather
  |            than stopping after the first connection is complete.
  |    -p port
  |            Change the default rendezvous port (1924) to another port.
  |            The following are well-known port numbers:
  |            \* HTTP 80
  |            \* HTTPS 443
  |            \* SMTP 25
  |            \* FTP 21
  |            \* IMAP 143
  |            \* IMAPS 993 (IMAP over SSL)
  |            \* NNTP 119
  |            \* NNTPS 563 (NNTP over SSL)
  | Usage and Examples
  |    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:
  |  $ ssltap www.netscape.com
  |    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: "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 continue to
  |    accept connections, switch on looping mode with the -l option. The
  |    following examples show the output from commonly used combinations of
  |    options.
  |    Example 1
  |  $ ssltap.exe -sx -p 444 interzone.mcom.com:443 > sx.txt
  |    Output
  |  Connected to interzone.mcom.com:443
  |  -->; [
  |  alloclen = 66 bytes
  |     [ssl2]  ClientHelloV2 {
  |              version = {0x03, 0x00}
  |              cipher-specs-length = 39 (0x27)
  |              sid-length = 0 (0x00)
  |              challenge-length = 16 (0x10)
  |              cipher-suites = {
  |                  (0x010080) SSL2/RSA/RC4-128/MD5
  |                    (0x020080) SSL2/RSA/RC4-40/MD5
  |                    (0x030080) SSL2/RSA/RC2CBC128/MD5
  |                    (0x040080) SSL2/RSA/RC2CBC40/MD5
  |                    (0x060040) SSL2/RSA/DES64CBC/MD5
  |                    (0x0700c0) SSL2/RSA/3DES192EDE-CBC/MD5
  |                    (0x000004) SSL3/RSA/RC4-128/MD5
  |                    (0x00ffe0) SSL3/RSA-FIPS/3DES192EDE-CBC/SHA
  |                    (0x00000a) SSL3/RSA/3DES192EDE-CBC/SHA
  |                    (0x00ffe1) SSL3/RSA-FIPS/DES64CBC/SHA
  |                    (0x000009) SSL3/RSA/DES64CBC/SHA
  |                    (0x000003) SSL3/RSA/RC4-40/MD5
  |                    (0x000006) SSL3/RSA/RC2CBC40/MD5
  |                    }
  |              session-id = { }
  |              challenge = { 0xec5d 0x8edb 0x37c9 0xb5c9 0x7b70 0x8fe9 0xd1d3
  |  0x2592 }
  |  }
  |  ]
  |  <-- [
  |  SSLRecord {
  |     0: 16 03 00 03  e5                                   \|.....
  |     type    = 22 (handshake)
  |     version = { 3,0 }
  |     length  = 997 (0x3e5)
  |     handshake {
  |     0: 02 00 00 46                                      \|...F
  |        type = 2 (server_hello)
  |        length = 70 (0x000046)
  |              ServerHello {
  |              server_version = {3, 0}
  |              random = {...}
  |     0: 77 8c 6e 26  6c 0c ec c0  d9 58 4f 47  d3 2d 01 45  \|
  |  wn&l.ì..XOG.-.E
  |     10: 5c 17 75 43  a7 4c 88 c7  88 64 3c 50  41 48 4f 7f  \|
  |  \.uC§L.Ç.d<PAHO.
  |                    session ID = {
  |                    length = 32
  |                  contents = {..}
  |     0: 14 11 07 a8  2a 31 91 29  11 94 40 37  57 10 a7 32  \| ...¨*1.)..@7W.§2
  |     10: 56 6f 52 62  fe 3d b3 65  b1 e4 13 0f  52 a3 c8 f6  \| VoRbþ=³e±...R£È.
  |           }
  |                 cipher_suite = (0x0003) SSL3/RSA/RC4-40/MD5
  |           }
  |     0: 0b 00 02 c5                                      \|...Å
  |        type = 11 (certificate)
  |        length = 709 (0x0002c5)
  |              CertificateChain {
  |              chainlength = 706 (0x02c2)
  |                 Certificate {
  |              size = 703 (0x02bf)
  |                 data = { saved in file 'cert.001' }
  |              }
  |           }
  |     0: 0c 00 00 ca                                      \|....
  |           type = 12 (server_key_exchange)
  |           length = 202 (0x0000ca)
  |     0: 0e 00 00 00                                      \|....
  |           type = 14 (server_hello_done)
  |           length = 0 (0x000000)
  |     }
  |  }
  |  ]
  |  --> [
  |  SSLRecord {
  |     0: 16 03 00 00  44                                   \|....D
  |     type    = 22 (handshake)
  |     version = { 3,0 }
  |     length  = 68 (0x44)
  |     handshake {
  |     0: 10 00 00 40                                      \|...@
  |     type = 16 (client_key_exchange)
  |     length = 64 (0x000040)
  |           ClientKeyExchange {
  |              message = {...}
  |           }
  |     }
  |  }
  |  ]
  |  --> [
  |  SSLRecord {
  |     0: 14 03 00 00  01                                   \|.....
  |     type    = 20 (change_cipher_spec)
  |     version = { 3,0 }
  |     length  = 1 (0x1)
  |     0: 01                                               \|.
  |  }
  |  SSLRecord {
  |     0: 16 03 00 00  38                                   \|....8
  |     type    = 22 (handshake)
  |     version = { 3,0 }
  |     length  = 56 (0x38)
  |                 < encrypted >
  |  }
  |  ]
  |  <-- [
  |  SSLRecord {
  |     0: 14 03 00 00  01                                   \|.....
  |     type    = 20 (change_cipher_spec)
  |     version = { 3,0 }
  |     length  = 1 (0x1)
  |     0: 01                                               \|.
  |  }
  |  ]
  |  <-- [
  |  SSLRecord {
  |     0: 16 03 00 00  38                                   \|....8
  |     type    = 22 (handshake)
  |     version = { 3,0 }
  |     length  = 56 (0x38)
  |                    < encrypted >
  |  }
  |  ]
  |  --> [
  |  SSLRecord {
  |     0: 17 03 00 01  1f                                   \|.....
  |     type    = 23 (application_data)
  |     version = { 3,0 }
  |     length  = 287 (0x11f)
  |                 < encrypted >
  |  }
  |  ]
  |  <-- [
  |  SSLRecord {
  |     0: 17 03 00 00  a0                                   \|....
  |     type    = 23 (application_data)
  |     version = { 3,0 }
  |     length  = 160 (0xa0)
  |                 < encrypted >
  |  }
  |  ]
  |  <-- [
  |  SSLRecord {
  |  0: 17 03 00 00  df                                   \|....ß
  |     type    = 23 (application_data)
  |     version = { 3,0 }
  |     length  = 223 (0xdf)
  |                 < encrypted >
  |  }
  |  SSLRecord {
  |     0: 15 03 00 00  12                                   \|.....
  |     type    = 21 (alert)
  |     version = { 3,0 }
  |     length  = 18 (0x12)
  |                 < encrypted >
  |  }
  |  ]
  |  Server socket closed.
  |    Example 2
  |    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.
  |  $ ssltap -s  -p 444 interzone.mcom.com:443 > s.txt
  |    Output
  |  Connected to interzone.mcom.com:443
  |  --> [
  |  alloclen = 63 bytes
  |     [ssl2]  ClientHelloV2 {
  |              version = {0x03, 0x00}
  |              cipher-specs-length = 36 (0x24)
  |              sid-length = 0 (0x00)
  |              challenge-length = 16 (0x10)
  |              cipher-suites = {
  |                    (0x010080) SSL2/RSA/RC4-128/MD5
  |                    (0x020080) SSL2/RSA/RC4-40/MD5
  |                    (0x030080) SSL2/RSA/RC2CBC128/MD5
  |                    (0x060040) SSL2/RSA/DES64CBC/MD5
  |                    (0x0700c0) SSL2/RSA/3DES192EDE-CBC/MD5
  |                    (0x000004) SSL3/RSA/RC4-128/MD5
  |                    (0x00ffe0) SSL3/RSA-FIPS/3DES192EDE-CBC/SHA
  |                    (0x00000a) SSL3/RSA/3DES192EDE-CBC/SHA
  |                    (0x00ffe1) SSL3/RSA-FIPS/DES64CBC/SHA
  |                    (0x000009) SSL3/RSA/DES64CBC/SHA
  |                    (0x000003) SSL3/RSA/RC4-40/MD5
  |                    }
  |                 session-id = { }
  |              challenge = { 0x713c 0x9338 0x30e1 0xf8d6 0xb934 0x7351 0x200c
  |  0x3fd0 }
  |  ]
  |  >-- [
  |  SSLRecord {
  |     type    = 22 (handshake)
  |     version = { 3,0 }
  |     length  = 997 (0x3e5)
  |     handshake {
  |           type = 2 (server_hello)
  |           length = 70 (0x000046)
  |              ServerHello {
  |              server_version = {3, 0}
  |              random = {...}
  |              session ID = {
  |                 length = 32
  |                 contents = {..}
  |                 }
  |                 cipher_suite = (0x0003) SSL3/RSA/RC4-40/MD5
  |              }
  |           type = 11 (certificate)
  |           length = 709 (0x0002c5)
  |              CertificateChain {
  |                 chainlength = 706 (0x02c2)
  |                 Certificate {
  |                    size = 703 (0x02bf)
  |                    data = { saved in file 'cert.001' }
  |                 }
  |              }
  |           type = 12 (server_key_exchange)
  |           length = 202 (0x0000ca)
  |           type = 14 (server_hello_done)
  |           length = 0 (0x000000)
  |     }
  |  }
  |  ]
  |  --> [
  |  SSLRecord {
  |     type    = 22 (handshake)
  |     version = { 3,0 }
  |     length  = 68 (0x44)
  |     handshake {
  |           type = 16 (client_key_exchange)
  |           length = 64 (0x000040)
  |              ClientKeyExchange {
  |                 message = {...}
  |              }
  |     }
  |  }
  |  ]
  |  --> [
  |  SSLRecord {
  |     type    = 20 (change_cipher_spec)
  |     version = { 3,0 }
  |     length  = 1 (0x1)
  |  }
  |  SSLRecord {
  |     type    = 22 (handshake)
  |     version = { 3,0 }
  |     length  = 56 (0x38)
  |                 > encrypted >
  |  }
  |  ]
  |  >-- [
  |  SSLRecord {
  |     type    = 20 (change_cipher_spec)
  |     version = { 3,0 }
  |     length  = 1 (0x1)
  |  }
  |  ]
  |  >-- [
  |  SSLRecord {
  |     type    = 22 (handshake)
  |     version = { 3,0 }
  |     length  = 56 (0x38)
  |                 > encrypted >
  |  }
  |  ]
  |  --> [
  |  SSLRecord {
  |     type    = 23 (application_data)
  |     version = { 3,0 }
  |     length  = 287 (0x11f)
  |                 > encrypted >
  |  }
  |  ]
  |  [
  |  SSLRecord {
  |     type    = 23 (application_data)
  |     version = { 3,0 }
  |     length  = 160 (0xa0)
  |                 > encrypted >
  |  }
  |  ]
  |  >-- [
  |  SSLRecord {
  |     type    = 23 (application_data)
  |     version = { 3,0 }
  |     length  = 223 (0xdf)
  |                 > encrypted >
  |  }
  |  SSLRecord {
  |     type    = 21 (alert)
  |     version = { 3,0 }
  |     length  = 18 (0x12)
  |                 > encrypted >
  |  }
  |  ]
  |  Server socket closed.
  |    Example 3
  |    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.
  |  $ ssltap -h  -p 444 interzone.mcom.com:443 > h.txt
  |    Output
  |  Connected to interzone.mcom.com:443
  |  --> [
  |     0: 80 40 01 03  00 00 27 00  00 00 10 01  00 80 02 00  \| .@....'.........
  |     10: 80 03 00 80  04 00 80 06  00 40 07 00  c0 00 00 04  \| .........@......
  |     20: 00 ff e0 00  00 0a 00 ff  e1 00 00 09  00 00 03 00  \| ........á.......
  |     30: 00 06 9b fe  5b 56 96 49  1f 9f ca dd  d5 ba b9 52  \| ..þ[V.I.\xd9 ...º¹R
  |     40: 6f 2d                                            \|o-
  |  ]
  |  <-- [
  |     0: 16 03 00 03  e5 02 00 00  46 03 00 7f  e5 0d 1b 1d  \| ........F.......
  |     10: 68 7f 3a 79  60 d5 17 3c  1d 9c 96 b3  88 d2 69 3b  \| h.:y`..<..³.Òi;
  |     20: 78 e2 4b 8b  a6 52 12 4b  46 e8 c2 20  14 11 89 05  \| x.K.¦R.KFè. ...
  |     30: 4d 52 91 fd  93 e0 51 48  91 90 08 96  c1 b6 76 77  \| MR.ý..QH.....¶vw
  |     40: 2a f4 00 08  a1 06 61 a2  64 1f 2e 9b  00 03 00 0b  \| \*ô..¡.a¢d......
  |     50: 00 02 c5 00  02 c2 00 02  bf 30 82 02  bb 30 82 02  \| ..Å......0...0..
  |     60: 24 a0 03 02  01 02 02 02  01 36 30 0d  06 09 2a 86  \| $ .......60...*.
  |     70: 48 86 f7 0d  01 01 04 05  00 30 77 31  0b 30 09 06  \| H.÷......0w1.0..
  |     80: 03 55 04 06  13 02 55 53  31 2c 30 2a  06 03 55 04  \| .U....US1,0*..U.
  |     90: 0a 13 23 4e  65 74 73 63  61 70 65 20  43 6f 6d 6d  \| ..#Netscape Comm
  |     a0: 75 6e 69 63  61 74 69 6f  6e 73 20 43  6f 72 70 6f  \| unications Corpo
  |     b0: 72 61 74 69  6f 6e 31 11  30 0f 06 03  55 04 0b 13  \| ration1.0...U...
  |     c0: 08 48 61 72  64 63 6f 72  65 31 27 30  25 06 03 55  \| .Hardcore1'0%..U
  |     d0: 04 03 13 1e  48 61 72 64  63 6f 72 65  20 43 65 72  \| ....Hardcore Cer
  |     e0: 74 69 66 69  63 61 74 65  20 53 65 72  76 65 72 20  \| tificate Server
  |     f0: 49 49 30 1e  17 0d 39 38  30 35 31 36  30 31 30 33  \| II0...9805160103
  |  <additional data lines>
  |  ]
  |  <additional records in same format>
  |  Server socket closed.
  |    Example 4
  |    In this example, the -s option turns on SSL parsing, and the -h option
  |    turns on hex/ASCII format. Both formats are shown for each record. The
  |    output is routed to a text file.
  |  $ ssltap -hs -p 444 interzone.mcom.com:443 > hs.txt
  |    Output
  |  Connected to interzone.mcom.com:443
  |  --> [
  |     0: 80 3d 01 03  00 00 24 00  00 00 10 01  00 80 02 00  \| .=....$.........
  |     10: 80 03 00 80  04 00 80 06  00 40 07 00  c0 00 00 04  \| .........@......
  |     20: 00 ff e0 00  00 0a 00 ff  e1 00 00 09  00 00 03 03  \| ........á.......
  |     30: 55 e6 e4 99  79 c7 d7 2c  86 78 96 5d  b5 cf e9     \|U..yÇ\xb0 ,.x.]µÏé
  |  alloclen = 63 bytes
  |     [ssl2]  ClientHelloV2 {
  |              version = {0x03, 0x00}
  |              cipher-specs-length = 36 (0x24)
  |              sid-length = 0 (0x00)
  |              challenge-length = 16 (0x10)
  |              cipher-suites = {
  |                    (0x010080) SSL2/RSA/RC4-128/MD5
  |                    (0x020080) SSL2/RSA/RC4-40/MD5
  |                    (0x030080) SSL2/RSA/RC2CBC128/MD5
  |                    (0x040080) SSL2/RSA/RC2CBC40/MD5
  |                    (0x060040) SSL2/RSA/DES64CBC/MD5
  |                    (0x0700c0) SSL2/RSA/3DES192EDE-CBC/MD5
  |                    (0x000004) SSL3/RSA/RC4-128/MD5
  |                    (0x00ffe0) SSL3/RSA-FIPS/3DES192EDE-CBC/SHA
  |                    (0x00000a) SSL3/RSA/3DES192EDE-CBC/SHA
  |                    (0x00ffe1) SSL3/RSA-FIPS/DES64CBC/SHA
  |                    (0x000009) SSL3/RSA/DES64CBC/SHA
  |                    (0x000003) SSL3/RSA/RC4-40/MD5
  |                    }
  |              session-id = { }
  |              challenge = { 0x0355 0xe6e4 0x9979 0xc7d7 0x2c86 0x7896 0x5db
  |  0xcfe9 }
  |  }
  |  ]
  |  <additional records in same formats>
  |  Server socket closed.
  | Usage Tips
  |    When SSL restarts a previous session, it makes use of cached information
  |    to do a partial handshake. If you wish to capture a full SSL handshake,
  |    restart the browser to clear the session id cache.
  |    If you run the tool on a machine other than the SSL server to which you
  |    are trying to connect, the browser will complain that the host name you
  |    are trying to connect to is different from the certificate. If you are
  |    using the default BadCert callback, you can still connect through a
  |    dialog. If you are not using the default BadCert callback, the one you
  |    supply must allow for this possibility.
  | See Also
  |    The NSS Security Tools are also documented at
  |   
    [1]\ `http://www.mozilla.org/projects/security/pki/nss/ <https://www.mozilla.org/projects/security/pki/nss/>`__.
  | Additional Resources
  |    NSS is maintained in conjunction with PKI and security-related projects
  |    through Mozilla dn Fedora. The most closely-related project is Dogtag PKI,
  |    with a project wiki at [2]\ http://pki.fedoraproject.org/wiki/.
  |    For information specifically about NSS, the NSS project wiki is located at
  |   
    [3]\ `http://www.mozilla.org/projects/security/pki/nss/ <https://www.mozilla.org/projects/security/pki/nss/>`__.
    The NSS site relates
  |    directly to NSS code changes and releases.
  |    Mailing lists: pki-devel@redhat.com and pki-users@redhat.com
  |    IRC: Freenode at #dogtag-pki
  | Authors
  |    The NSS tools were written and maintained by developers with Netscape and
  |    now with Red Hat and Sun.
  |    Authors: Elio Maldonado <emaldona@redhat.com>, Deon Lackey
  |    <dlackey@redhat.com>.
  | Copyright
  |    (c) 2010, Red Hat, Inc. Licensed under the GNU Public License version 2.
  | References
  |    Visible links
  |    1.
    `http://www.mozilla.org/projects/secu.../pki/nss/tools <https://www.mozilla.org/projects/security/pki/nss/tools>`__
  |    2. http://pki.fedoraproject.org/wiki/
  |    3.
    `http://www.mozilla.org/projects/security/pki/nss/ <https://www.mozilla.org/projects/security/pki/nss/>`__