https://github.com/sorbo/tcpcrypt

Fast TCP encryption
https://github.com/sorbo/tcpcrypt

Last synced: 9 days ago
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Fast TCP encryption

• Host: GitHub
• URL: https://github.com/sorbo/tcpcrypt
• Owner: sorbo
• License: other
• Created: 2010-08-06T05:41:39.000Z (over 14 years ago)
• Default Branch: master
• Last Pushed: 2022-05-19T06:15:47.000Z (over 2 years ago)
• Last Synced: 2024-08-02T14:05:27.830Z (3 months ago)
• Language: C
• Homepage: http://tcpcrypt.org
• Size: 2.36 MB
• Stars: 242
• Watchers: 21
• Forks: 106
• Open Issues: 28
• Metadata Files:
  • Readme: README.markdown
  • License: LICENSE

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README

        
Tcpcrypt

========

Tcpcrypt is a protocol that attempts to encrypt (almost) all of your network

traffic. Unlike other security mechanisms, Tcpcrypt works out of the box: it

requires no configuration, no changes to applications, and your network

connections will continue to work even if the remote end does not support

Tcpcrypt, in which case connections will gracefully fall back to standard

clear-text TCP.

Tcpcrypt supports Linux, Mac OS X, Windows, and FreeBSD.

For more information, see [tcpcrypt.org](http://tcpcrypt.org).

Installing tcpcrypt

-------------------

    git clone git://github.com/sorbo/tcpcrypt.git

    cd tcpcrypt/user

    ./configure

    make

    sudo ./launch_tcpcryptd.sh

The launch script starts tcpcryptd and adds firewall rules to divert Web and

local port 7777 (an arbitrarily chosen port number) traffic to tcpcryptd. When the script exits (on Ctrl-C or

`kill`), it restores your firewall config to its former state--**no permanent

changes are made**.

On Linux, you must first install libnfnetlink, libnetfilter_queue, and libcap.

Optional: running `make install` will install `libtcpcrypt` and tcpcrypt

headers, for building apps that use tcpcrypt's session ID.

Try it out

---------- 

Go to [http://tcpcrypt.org/test.php](http://tcpcrypt.org/test.php) with

tcpcryptd running. If tcpcrypt is working, you'll be able to join the

tcpcrypt Hall of Fame and your tcpcrypt session ID will be displayed at the

bottom of the page.

Now let's examine the packets going over the wire by starting tcpdump and then

reloading the URL above.

    sudo tcpdump -X -s0 host tcpcrypt.org

Compare this tcpdump output, which appears encrypted (or at least unreadable),

with the cleartext packets you would see without tcpcryptd running.

A final netcat example:

    # in tcpcrypt/user

    sudo ./launch_tcpcryptd.sh & 

    nc -l 7777 &

    sudo tcpdump -i lo -n -s0 -vvvv -X tcp port 7777 &

    echo hello, world! | nc localhost 7777

    

    # clean up

    sudo killall tcpcryptd tcpdump

Troubleshooting

---------------

If it's not working, the most likely causes are the following.

   * Your browser already had an open, non-tcpcrypted TCP connection to

     tcpcrypt.org before you ran the launch script. Quit and reopen your

     browser, wait 30 seconds, or use a different browser to retrieve the

     tcpcrypt.org URL.

   * There's a conflict with your existing firewall rules. See the

     firewall setup section in the install guide for your platform.

Visit [http://wiki.github.com/sorbo/tcpcrypt/troubleshooting](http://wiki.github.com/sorbo/tcpcrypt/troubleshooting) if you're still

unable to make it work.

To build the `test_tcpcrypt` utility, run `make check` from `user/`. Run `test_tcpcrypt -v` to see the various tests that it can run.

More info

---------

The `INSTALL-*` files have more detailed installation and firewall setup instructions. See [tcpcrypt.org](http://tcpcrypt.org) for general info, including the [protocol specification](http://tcpcrypt.org/docs.php) and the [tcpcrypt paper, "The case for ubiquitous transport-level encryption"](http://tcpcrypt.org/tcpcrypt.pdf), presented at USENIX Security 2010.

The code repository lives at [http://github.com/sorbo/tcpcrypt](http://github.com/sorbo/tcpcrypt).