Import Debian changes 1.0.9-1

tinc (1.0.9-1) unstable; urgency=low

  * New upstream release.
    - Binds IPv6 sockets only to IPv6. Closes: #440150
  * Update copyright file. Closes: #482566
This commit is contained in:
Guus Sliepen 2008-12-26 13:25:05 +01:00
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<h1 class="chapter"> 1. Introduction </h1>
<p>Tinc is a Virtual Private Network (VPN) daemon that uses tunneling and
encryption to create a secure private network between hosts on the
Internet.
</p>
<p>Because the tunnel appears to the IP level network code as a normal
network device, there is no need to adapt any existing software.
The encrypted tunnels allows VPN sites to share information with each other
over the Internet without exposing any information to others.
</p>
<p>This document is the manual for tinc. Included are chapters on how to
configure your computer to use tinc, as well as the configuration
process of tinc itself.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top"><a href="#SEC2">1.1 Virtual Private Networks</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#SEC3">1.2 tinc</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top"> About tinc
</td></tr>
<tr><td align="left" valign="top"><a href="#SEC4">1.3 Supported platforms</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
</table>
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<h2 class="section"> 1.1 Virtual Private Networks </h2>
<a name="IDX1"></a>
<p>A Virtual Private Network or VPN is a network that can only be accessed
by a few elected computers that participate. This goal is achievable in
more than just one way.
</p>
<a name="IDX2"></a>
<p>Private networks can consist of a single stand-alone Ethernet LAN. Or
even two computers hooked up using a null-modem cable. In these cases,
it is
obvious that the network is <em>private</em>, no one can access it from the
outside. But if your computers are linked to the Internet, the network
is not private anymore, unless one uses firewalls to block all private
traffic. But then, there is no way to send private data to trusted
computers on the other end of the Internet.
</p>
<p>This problem can be solved by using <em>virtual</em> networks. Virtual
networks can live on top of other networks, but they use encapsulation to
keep using their private address space so they do not interfere with
the Internet. Mostly, virtual networks appear like a singe LAN, even though
they can span the entire world. But virtual networks can't be secured
by using firewalls, because the traffic that flows through it has to go
through the Internet, where other people can look at it.
</p>
<p>As is the case with either type of VPN, anybody could eavesdrop. Or
worse, alter data. Hence it's probably advisable to encrypt the data
that flows over the network.
</p>
<p>When one introduces encryption, we can form a true VPN. Other people may
see encrypted traffic, but if they don't know how to decipher it (they
need to know the key for that), they cannot read the information that flows
through the VPN. This is what tinc was made for.
</p>
<hr size="6">
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<h2 class="section"> 1.2 tinc </h2>
<a name="IDX3"></a>
<p>I really don't quite remember what got us started, but it must have been
Guus' idea. He wrote a simple implementation (about 50 lines of C) that
used the ethertap device that Linux knows of since somewhere
about kernel 2.1.60. It didn't work immediately and he improved it a
bit. At this stage, the project was still simply called &quot;vpnd&quot;.
</p>
<p>Since then, a lot has changed&mdash;to say the least.
</p>
<a name="IDX4"></a>
<p>Tinc now supports encryption, it consists of a single daemon (tincd) for
both the receiving and sending end, it has become largely
runtime-configurable&mdash;in short, it has become a full-fledged
professional package.
</p>
<a name="IDX5"></a>
<p>Tinc also allows more than two sites to connect to eachother and form a single VPN.
Traditionally VPNs are created by making tunnels, which only have two endpoints.
Larger VPNs with more sites are created by adding more tunnels.
Tinc takes another approach: only endpoints are specified,
the software itself will take care of creating the tunnels.
This allows for easier configuration and improved scalability.
</p>
<p>A lot can&mdash;and will be&mdash;changed. We have a number of things that we would like to
see in the future releases of tinc. Not everything will be available in
the near future. Our first objective is to make tinc work perfectly as
it stands, and then add more advanced features.
</p>
<p>Meanwhile, we're always open-minded towards new ideas. And we're
available too.
</p>
<hr size="6">
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<h2 class="section"> 1.3 Supported platforms </h2>
<a name="IDX6"></a>
<p>Tinc has been verified to work under Linux, FreeBSD, OpenBSD, NetBSD, MacOS/X (Darwin), Solaris, and Windows (both natively and in a Cygwin environment),
with various hardware architectures. These are some of the platforms
that are supported by the universal tun/tap device driver or other virtual network device drivers.
Without such a driver, tinc will most
likely compile and run, but it will not be able to send or receive data
packets.
</p>
<p>For an up to date list of supported platforms, please check the list on
our website:
<a href="http://www.tinc-vpn.org/platforms">http://www.tinc-vpn.org/platforms</a>.
</p>
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<h1 class="chapter"> 2. Preparations </h1>
<p>This chapter contains information on how to prepare your system to
support tinc.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top"><a href="#SEC6">2.1 Configuring the kernel</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#SEC14">2.2 Libraries</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<h2 class="section"> 2.1 Configuring the kernel </h2>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top"><a href="#SEC7">2.1.1 Configuration of Linux kernels</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#SEC8">2.1.2 Configuration of FreeBSD kernels</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#SEC9">2.1.3 Configuration of OpenBSD kernels</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#SEC10">2.1.4 Configuration of NetBSD kernels</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#SEC11">2.1.5 Configuration of Solaris kernels</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#SEC12">2.1.6 Configuration of Darwin (MacOS/X) kernels</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#SEC13">2.1.7 Configuration of Windows</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
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<h3 class="subsection"> 2.1.1 Configuration of Linux kernels </h3>
<p>For tinc to work, you need a kernel that supports the Universal tun/tap device.
Most distributions come with kernels that already support this.
Here are the options you have to turn on when configuring a new kernel:
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">Code maturity level options
[*] Prompt for development and/or incomplete code/drivers
Network device support
&lt;M&gt; Universal tun/tap device driver support
</pre></td></tr></table>
<p>It's not necessary to compile this driver as a module, even if you are going to
run more than one instance of tinc.
</p>
<p>If you decide to build the tun/tap driver as a kernel module, add these lines
to &lsquo;<tt>/etc/modules.conf</tt>&rsquo;:
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">alias char-major-10-200 tun
</pre></td></tr></table>
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<h3 class="subsection"> 2.1.2 Configuration of FreeBSD kernels </h3>
<p>For FreeBSD version 4.1 and higher, tun and tap drivers are included in the default kernel configuration.
Using tap devices is recommended.
</p>
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<h3 class="subsection"> 2.1.3 Configuration of OpenBSD kernels </h3>
<p>For OpenBSD version 2.9 and higher,
the tun driver is included in the default kernel configuration.
There is also a kernel patch from <a href="http://diehard.n-r-g.com/stuff/openbsd/">http://diehard.n-r-g.com/stuff/openbsd/</a>
which adds a tap device to OpenBSD which should work with tinc,
but with recent versions of OpenBSD,
a tun device can act as a tap device by setting the link0 option with ifconfig.
</p>
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<h3 class="subsection"> 2.1.4 Configuration of NetBSD kernels </h3>
<p>For NetBSD version 1.5.2 and higher,
the tun driver is included in the default kernel configuration.
</p>
<p>Tunneling IPv6 may not work on NetBSD's tun device.
</p>
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<h3 class="subsection"> 2.1.5 Configuration of Solaris kernels </h3>
<p>For Solaris 8 (SunOS 5.8) and higher,
the tun driver may or may not be included in the default kernel configuration.
If it isn't, the source can be downloaded from <a href="http://vtun.sourceforge.net/tun/">http://vtun.sourceforge.net/tun/</a>.
For x86 and sparc64 architectures, precompiled versions can be found at <a href="http://www.monkey.org/~dugsong/fragroute/">http://www.monkey.org/~dugsong/fragroute/</a>.
If the &lsquo;<tt>net/if_tun.h</tt>&rsquo; header file is missing, install it from the source package.
</p>
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<h3 class="subsection"> 2.1.6 Configuration of Darwin (MacOS/X) kernels </h3>
<p>Tinc on Darwin relies on a tunnel driver for its data acquisition from the kernel.
Tinc supports either the driver from <a href="http://www-user.rhrk.uni-kl.de/~nissler/tuntap/">http://www-user.rhrk.uni-kl.de/~nissler/tuntap/</a>,
which supports both tun and tap style devices,
and also the driver from from <a href="http://chrisp.de/en/projects/tunnel.html">http://chrisp.de/en/projects/tunnel.html</a>.
The former driver is recommended.
The tunnel driver must be loaded before starting tinc with the following command:
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">kmodload tunnel
</pre></td></tr></table>
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<h3 class="subsection"> 2.1.7 Configuration of Windows </h3>
<p>You will need to install the latest TAP-Win32 driver from OpenVPN.
You can download it from <a href="http://openvpn.sourceforge.net">http://openvpn.sourceforge.net</a>.
Using the Network Connections control panel,
configure the TAP-Win32 network interface in the same way as you would do from the tinc-up script,
as explained in the rest of the documentation.
</p>
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<h2 class="section"> 2.2 Libraries </h2>
<p>Before you can configure or build tinc, you need to have the OpenSSL,
zlib and lzo libraries installed on your system. If you try to configure tinc without
having them installed, configure will give you an error message, and stop.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top"><a href="#SEC15">2.2.1 OpenSSL</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#SEC17">2.2.2 zlib</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#SEC18">2.2.3 lzo</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
</table>
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<h3 class="subsection"> 2.2.1 OpenSSL </h3>
<p>For all cryptography-related functions, tinc uses the functions provided
by the OpenSSL library.
</p>
<p>If this library is not installed, you wil get an error when configuring
tinc for build. Support for running tinc without having OpenSSL
installed <em>may</em> be added in the future.
</p>
<p>You can use your operating system's package manager to install this if
available. Make sure you install the development AND runtime versions
of this package.
</p>
<p>If you have to install OpenSSL manually, you can get the source code
from <a href="http://www.openssl.org/">http://www.openssl.org/</a>. Instructions on how to configure,
build and install this package are included within the package. Please
make sure you build development and runtime libraries (which is the
default).
</p>
<p>If you installed the OpenSSL libraries from source, it may be necessary
to let configure know where they are, by passing configure one of the
&ndash;with-openssl-* parameters.
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">--with-openssl=DIR OpenSSL library and headers prefix
--with-openssl-include=DIR OpenSSL headers directory
(Default is OPENSSL_DIR/include)
--with-openssl-lib=DIR OpenSSL library directory
(Default is OPENSSL_DIR/lib)
</pre></td></tr></table>
<a name="SEC16"></a>
<h4 class="subsubheading"> License </h4>
<p>The complete source code of tinc is covered by the GNU GPL version 2.
Since the license under which OpenSSL is distributed is not directly
compatible with the terms of the GNU GPL
<a href="http://www.openssl.org/support/faq.html#LEGAL2">http://www.openssl.org/support/faq.html#LEGAL2</a>, we
include an exemption to the GPL (see also the file COPYING.README) to allow
everyone to create a statically or dynamically linked executable:
</p>
<blockquote><p>This program is released under the GPL with the additional exemption
that compiling, linking, and/or using OpenSSL is allowed. You may
provide binary packages linked to the OpenSSL libraries, provided that
all other requirements of the GPL are met.
</p></blockquote>
<p>Since the LZO library used by tinc is also covered by the GPL,
we also present the following exemption:
</p>
<blockquote><p>Hereby I grant a special exception to the tinc VPN project
(http://www.tinc-vpn.org/) to link the LZO library with the OpenSSL library
(http://www.openssl.org).
</p>
<p>Markus F.X.J. Oberhumer
</p></blockquote>
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<h3 class="subsection"> 2.2.2 zlib </h3>
<p>For the optional compression of UDP packets, tinc uses the functions provided
by the zlib library.
</p>
<p>If this library is not installed, you wil get an error when configuring
tinc for build. Support for running tinc without having zlib
installed <em>may</em> be added in the future.
</p>
<p>You can use your operating system's package manager to install this if
available. Make sure you install the development AND runtime versions
of this package.
</p>
<p>If you have to install zlib manually, you can get the source code
from <a href="http://www.gzip.org/zlib/">http://www.gzip.org/zlib/</a>. Instructions on how to configure,
build and install this package are included within the package. Please
make sure you build development and runtime libraries (which is the
default).
</p>
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<h3 class="subsection"> 2.2.3 lzo </h3>
<a name="IDX7"></a>
<p>Another form of compression is offered using the lzo library.
</p>
<p>If this library is not installed, you wil get an error when configuring
tinc for build. Support for running tinc without having lzo
installed <em>may</em> be added in the future.
</p>
<p>You can use your operating system's package manager to install this if
available. Make sure you install the development AND runtime versions
of this package.
</p>
<p>If you have to install lzo manually, you can get the source code
from <a href="http://www.oberhumer.com/opensource/lzo/">http://www.oberhumer.com/opensource/lzo/</a>. Instructions on how to configure,
build and install this package are included within the package. Please
make sure you build development and runtime libraries (which is the
default).
</p>
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<h1 class="chapter"> 3. Installation </h1>
<p>If you use Debian, you may want to install one of the
precompiled packages for your system. These packages are equipped with
system startup scripts and sample configurations.
</p>
<p>If you cannot use one of the precompiled packages, or you want to compile tinc
for yourself, you can use the source. The source is distributed under
the GNU General Public License (GPL). Download the source from the
<a href="http://www.tinc-vpn.org/download">download page</a>, which has
the checksums of these files listed; you may wish to check these with
md5sum before continuing.
</p>
<p>Tinc comes in a convenient autoconf/automake package, which you can just
treat the same as any other package. Which is just untar it, type
`./configure' and then `make'.
More detailed instructions are in the file &lsquo;<tt>INSTALL</tt>&rsquo;, which is
included in the source distribution.
</p>
<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top"><a href="#SEC24">3.2 System files</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<h2 class="section"> 3.1 Building and installing tinc </h2>
<p>Detailed instructions on configuring the source, building tinc and installing tinc
can be found in the file called &lsquo;<tt>INSTALL</tt>&rsquo;.
</p>
<p>If you happen to have a binary package for tinc for your distribution,
you can use the package management tools of that distribution to install tinc.
The documentation that comes along with your distribution will tell you how to do that.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top"><a href="#SEC21">3.1.1 Darwin (MacOS/X) build environment</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#SEC22">3.1.2 Cygwin (Windows) build environment</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#SEC23">3.1.3 MinGW (Windows) build environment</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
</table>
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<h3 class="subsection"> 3.1.1 Darwin (MacOS/X) build environment </h3>
<p>In order to build tinc on Darwin, you need to install the MacOS/X Developer Tools
from <a href="http://developer.apple.com/tools/macosxtools.html">http://developer.apple.com/tools/macosxtools.html</a> and
a recent version of Fink from <a href="http://fink.sourceforge.net/">http://fink.sourceforge.net/</a>.
</p>
<p>After installation use fink to download and install the following packages:
autoconf25, automake, dlcompat, m4, openssl, zlib and lzo.
</p>
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<h3 class="subsection"> 3.1.2 Cygwin (Windows) build environment </h3>
<p>If Cygwin hasn't already been installed, install it directly from
<a href="http://www.cygwin.com/">http://www.cygwin.com/</a>.
</p>
<p>When tinc is compiled in a Cygwin environment, it can only be run in this environment,
but all programs, including those started outside the Cygwin environment, will be able to use the VPN.
It will also support all features.
</p>
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<h3 class="subsection"> 3.1.3 MinGW (Windows) build environment </h3>
<p>You will need to install the MinGW environment from <a href="http://www.mingw.org">http://www.mingw.org</a>.
</p>
<p>When tinc is compiled using MinGW it runs natively under Windows,
it is not necessary to keep MinGW installed.
</p>
<p>When detaching, tinc will install itself as a service,
which will be restarted automatically after reboots.
</p>
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<h2 class="section"> 3.2 System files </h2>
<p>Before you can run tinc, you must make sure you have all the needed
files on your system.
</p>
<table class="menu" border="0" cellspacing="0">
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<h3 class="subsection"> 3.2.1 Device files </h3>
<p>Most operating systems nowadays come with the necessary device files by default,
or they have a mechanism to create them on demand.
</p>
<p>If you use Linux and do not have udev installed,
you may need to create the following device file if it does not exist:
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">mknod -m 600 /dev/net/tun c 10 200
</pre></td></tr></table>
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<h3 class="subsection"> 3.2.2 Other files </h3>
<a name="SEC27"></a>
<h4 class="subsubheading"> &lsquo;<tt>/etc/networks</tt>&rsquo; </h4>
<p>You may add a line to &lsquo;<tt>/etc/networks</tt>&rsquo; so that your VPN will get a
symbolic name. For example:
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">myvpn 10.0.0.0
</pre></td></tr></table>
<a name="SEC28"></a>
<h4 class="subsubheading"> &lsquo;<tt>/etc/services</tt>&rsquo; </h4>
<a name="IDX8"></a>
<p>You may add this line to &lsquo;<tt>/etc/services</tt>&rsquo;. The effect is that you
may supply a &lsquo;<samp>tinc</samp>&rsquo; as a valid port number to some programs. The
number 655 is registered with the IANA.
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">tinc 655/tcp TINC
tinc 655/udp TINC
# Ivo Timmermans &lt;ivo@tinc-vpn.org&gt;
</pre></td></tr></table>
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<h1 class="chapter"> 5. Running tinc </h1>
<p>If everything else is done, you can start tinc by typing the following command:
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">tincd -n <var>netname</var>
</pre></td></tr></table>
<a name="IDX64"></a>
<p>Tinc will detach from the terminal and continue to run in the background like a good daemon.
If there are any problems however you can try to increase the debug level
and look in the syslog to find out what the problems are.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top"><a href="#SEC50">5.1 Runtime options</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<h2 class="section"> 5.1 Runtime options </h2>
<p>Besides the settings in the configuration file, tinc also accepts some
command line options.
</p>
<a name="IDX65"></a>
<a name="IDX66"></a>
<a name="IDX67"></a>
<dl compact="compact">
<dt> &lsquo;<samp>-c, --config=<var>path</var></samp>&rsquo;</dt>
<dd><p>Read configuration options from the directory <var>path</var>. The default is
&lsquo;<tt>/etc/tinc/<var>netname</var>/</tt>&rsquo;.
</p>
</dd>
<dt> &lsquo;<samp>-D, --no-detach</samp>&rsquo;</dt>
<dd><p>Don't fork and detach.
This will also disable the automatic restart mechanism for fatal errors.
</p>
</dd>
<dt> &lsquo;<samp>-d, --debug=<var>level</var></samp>&rsquo;</dt>
<dd><p>Set debug level to <var>level</var>. The higher the debug level, the more gets
logged. Everything goes via syslog.
</p>
</dd>
<dt> &lsquo;<samp>-k, --kill[=<var>signal</var>]</samp>&rsquo;</dt>
<dd><p>Attempt to kill a running tincd (optionally with the specified <var>signal</var> instead of SIGTERM) and exit.
Use it in conjunction with the -n option to make sure you kill the right tinc daemon.
Under native Windows the optional argument is ignored,
the service will always be stopped and removed.
</p>
</dd>
<dt> &lsquo;<samp>-n, --net=<var>netname</var></samp>&rsquo;</dt>
<dd><p>Use configuration for net <var>netname</var>. See section <a href="tinc_3.html#SEC31">Multiple networks</a>.
</p>
</dd>
<dt> &lsquo;<samp>-K, --generate-keys[=<var>bits</var>]</samp>&rsquo;</dt>
<dd><p>Generate public/private keypair of <var>bits</var> length. If <var>bits</var> is not specified,
1024 is the default. tinc will ask where you want to store the files,
but will default to the configuration directory (you can use the -c or -n option
in combination with -K). After that, tinc will quit.
</p>
</dd>
<dt> &lsquo;<samp>-L, --mlock</samp>&rsquo;</dt>
<dd><p>Lock tinc into main memory.
This will prevent sensitive data like shared private keys to be written to the system swap files/partitions.
</p>
</dd>
<dt> &lsquo;<samp>--logfile[=<var>file</var>]</samp>&rsquo;</dt>
<dd><p>Write log entries to a file instead of to the system logging facility.
If <var>file</var> is omitted, the default is &lsquo;<tt>/var/log/tinc.<var>netname</var>.log</tt>&rsquo;.
</p>
</dd>
<dt> &lsquo;<samp>--pidfile=<var>file</var></samp>&rsquo;</dt>
<dd><p>Write PID to <var>file</var> instead of &lsquo;<tt>/var/run/tinc.<var>netname</var>.pid</tt>&rsquo;.
</p>
</dd>
<dt> &lsquo;<samp>--bypass-security</samp>&rsquo;</dt>
<dd><p>Disables encryption and authentication.
Only useful for debugging.
</p>
</dd>
<dt> &lsquo;<samp>--help</samp>&rsquo;</dt>
<dd><p>Display a short reminder of these runtime options and terminate.
</p>
</dd>
<dt> &lsquo;<samp>--version</samp>&rsquo;</dt>
<dd><p>Output version information and exit.
</p>
</dd>
</dl>
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<h2 class="section"> 5.2 Signals </h2>
<p>You can also send the following signals to a running tincd process:
</p>
<dl compact="compact">
<dt> &lsquo;<samp>ALRM</samp>&rsquo;</dt>
<dd><p>Forces tinc to try to connect to all uplinks immediately.
Usually tinc attempts to do this itself,
but increases the time it waits between the attempts each time it failed,
and if tinc didn't succeed to connect to an uplink the first time after it started,
it defaults to the maximum time of 15 minutes.
</p>
</dd>
<dt> &lsquo;<samp>HUP</samp>&rsquo;</dt>
<dd><p>Partially rereads configuration files.
Connections to hosts whose host config file are removed are closed.
New outgoing connections specified in &lsquo;<tt>tinc.conf</tt>&rsquo; will be made.
</p>
</dd>
<dt> &lsquo;<samp>INT</samp>&rsquo;</dt>
<dd><p>Temporarily increases debug level to 5.
Send this signal again to revert to the original level.
</p>
</dd>
<dt> &lsquo;<samp>USR1</samp>&rsquo;</dt>
<dd><p>Dumps the connection list to syslog.
</p>
</dd>
<dt> &lsquo;<samp>USR2</samp>&rsquo;</dt>
<dd><p>Dumps virtual network device statistics, all known nodes, edges and subnets to syslog.
</p>
</dd>
<dt> &lsquo;<samp>WINCH</samp>&rsquo;</dt>
<dd><p>Purges all information remembered about unreachable nodes.
</p>
</dd>
</dl>
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<h2 class="section"> 5.3 Debug levels </h2>
<p>The tinc daemon can send a lot of messages to the syslog.
The higher the debug level, the more messages it will log.
Each level inherits all messages of the previous level:
</p>
<dl compact="compact">
<dt> &lsquo;<samp>0</samp>&rsquo;</dt>
<dd><p>This will log a message indicating tinc has started along with a version number.
It will also log any serious error.
</p>
</dd>
<dt> &lsquo;<samp>1</samp>&rsquo;</dt>
<dd><p>This will log all connections that are made with other tinc daemons.
</p>
</dd>
<dt> &lsquo;<samp>2</samp>&rsquo;</dt>
<dd><p>This will log status and error messages from scripts and other tinc daemons.
</p>
</dd>
<dt> &lsquo;<samp>3</samp>&rsquo;</dt>
<dd><p>This will log all requests that are exchanged with other tinc daemons. These include
authentication, key exchange and connection list updates.
</p>
</dd>
<dt> &lsquo;<samp>4</samp>&rsquo;</dt>
<dd><p>This will log a copy of everything received on the meta socket.
</p>
</dd>
<dt> &lsquo;<samp>5</samp>&rsquo;</dt>
<dd><p>This will log all network traffic over the virtual private network.
</p>
</dd>
</dl>
<hr size="6">
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<h2 class="section"> 5.4 Solving problems </h2>
<p>If tinc starts without problems, but if the VPN doesn't work, you will have to find the cause of the problem.
The first thing to do is to start tinc with a high debug level in the foreground,
so you can directly see everything tinc logs:
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">tincd -n <var>netname</var> -d5 -D
</pre></td></tr></table>
<p>If tinc does not log any error messages, then you might want to check the following things:
</p>
<ul class="toc">
<li> &lsquo;<tt>tinc-up</tt>&rsquo; script
Does this script contain the right commands?
Normally you must give the interface the address of this host on the VPN, and the netmask must be big enough so that the entire VPN is covered.
</li><li> Subnet
Does the Subnet (or Subnets) in the host configuration file of this host match the portion of the VPN that belongs to this host?
</li><li> Firewalls and NATs
Do you have a firewall or a NAT device (a masquerading firewall or perhaps an ADSL router that performs masquerading)?
If so, check that it allows TCP and UDP traffic on port 655.
If it masquerades and the host running tinc is behind it, make sure that it forwards TCP and UDP traffic to port 655 to the host running tinc.
You can add &lsquo;<samp>TCPOnly = yes</samp>&rsquo; to your host config file to force tinc to only use a single TCP connection,
this works through most firewalls and NATs.
</li></ul>
<hr size="6">
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<h2 class="section"> 5.5 Error messages </h2>
<p>What follows is a list of the most common error messages you might find in the logs.
Some of them will only be visible if the debug level is high enough.
</p>
<dl compact="compact">
<dt> &lsquo;<samp>Could not open /dev/tap0: No such device</samp>&rsquo;</dt>
<dd>
<ul class="toc">
<li> You forgot to `modprobe netlink_dev' or `modprobe ethertap'.
</li><li> You forgot to compile `Netlink device emulation' in the kernel.
</li></ul>
</dd>
<dt> &lsquo;<samp>Can't write to /dev/net/tun: No such device</samp>&rsquo;</dt>
<dd>
<ul class="toc">
<li> You forgot to `modprobe tun'.
</li><li> You forgot to compile `Universal TUN/TAP driver' in the kernel.
</li><li> The tun device is located somewhere else in &lsquo;<tt>/dev/</tt>&rsquo;.
</li></ul>
</dd>
<dt> &lsquo;<samp>Network address and prefix length do not match!</samp>&rsquo;</dt>
<dd>
<ul class="toc">
<li> The Subnet field must contain a <em>network</em> address, trailing bits should be 0.
</li><li> If you only want to use one IP address, set the netmask to /32.
</li></ul>
</dd>
<dt> &lsquo;<samp>Error reading RSA key file `rsa_key.priv': No such file or directory</samp>&rsquo;</dt>
<dd>
<ul class="toc">
<li> You forgot to create a public/private keypair.
</li><li> Specify the complete pathname to the private key file with the &lsquo;<samp>PrivateKeyFile</samp>&rsquo; option.
</li></ul>
</dd>
<dt> &lsquo;<samp>Warning: insecure file permissions for RSA private key file `rsa_key.priv'!</samp>&rsquo;</dt>
<dd>
<ul class="toc">
<li> The private key file is readable by users other than root.
Use chmod to correct the file permissions.
</li></ul>
</dd>
<dt> &lsquo;<samp>Creating metasocket failed: Address family not supported</samp>&rsquo;</dt>
<dd>
<ul class="toc">
<li> By default tinc tries to create both IPv4 and IPv6 sockets.
On some platforms this might not be implemented.
If the logs show &lsquo;<samp>Ready</samp>&rsquo; later on, then at least one metasocket was created,
and you can ignore this message.
You can add &lsquo;<samp>AddressFamily = ipv4</samp>&rsquo; to &lsquo;<tt>tinc.conf</tt>&rsquo; to prevent this from happening.
</li></ul>
</dd>
<dt> &lsquo;<samp>Cannot route packet: unknown IPv4 destination 1.2.3.4</samp>&rsquo;</dt>
<dd>
<ul class="toc">
<li> You try to send traffic to a host on the VPN for which no Subnet is known.
</li><li> If it is a broadcast address (ending in .255), it probably is a samba server or a Windows host sending broadcast packets.
You can ignore it.
</li></ul>
</dd>
<dt> &lsquo;<samp>Cannot route packet: ARP request for unknown address 1.2.3.4</samp>&rsquo;</dt>
<dd>
<ul class="toc">
<li> You try to send traffic to a host on the VPN for which no Subnet is known.
</li></ul>
</dd>
<dt> &lsquo;<samp>Packet with destination 1.2.3.4 is looping back to us!</samp>&rsquo;</dt>
<dd>
<ul class="toc">
<li> Something is not configured right. Packets are being sent out to the
virtual network device, but according to the Subnet directives in your host configuration
file, those packets should go to your own host. Most common mistake is that
you have a Subnet line in your host configuration file with a prefix length which is
just as large as the prefix of the virtual network interface. The latter should in almost all
cases be larger. Rethink your configuration.
Note that you will only see this message if you specified a debug
level of 5 or higher!
</li><li> Chances are that a &lsquo;<samp>Subnet = ...</samp>&rsquo; line in the host configuration file of this tinc daemon is wrong.
Change it to a subnet that is accepted locally by another interface,
or if that is not the case, try changing the prefix length into /32.
</li></ul>
</dd>
<dt> &lsquo;<samp>Node foo (1.2.3.4) is not reachable</samp>&rsquo;</dt>
<dd>
<ul class="toc">
<li> Node foo does not have a connection anymore, its tinc daemon is not running or its connection to the Internet is broken.
</li></ul>
</dd>
<dt> &lsquo;<samp>Received UDP packet from unknown source 1.2.3.4 (port 12345)</samp>&rsquo;</dt>
<dd>
<ul class="toc">
<li> If you see this only sporadically, it is harmless and caused by a node sending packets using an old key.
</li><li> If you see this often and another node is not reachable anymore, then a NAT (masquerading firewall) is changing the source address of UDP packets.
You can add &lsquo;<samp>TCPOnly = yes</samp>&rsquo; to host configuration files to force all VPN traffic to go over a TCP connection.
</li></ul>
</dd>
<dt> &lsquo;<samp>Got bad/bogus/unauthorized REQUEST from foo (1.2.3.4 port 12345)</samp>&rsquo;</dt>
<dd>
<ul class="toc">
<li> Node foo does not have the right public/private keypair.
Generate new keypairs and distribute them again.
</li><li> An attacker tries to gain access to your VPN.
</li><li> A network error caused corruption of metadata sent from foo.
</li></ul>
</dd>
</dl>
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<h2 class="section"> 5.6 Sending bug reports </h2>
<p>If you really can't find the cause of a problem, or if you suspect tinc is not working right,
you can send us a bugreport, see <a href="tinc_7.html#SEC69">Contact information</a>.
Be sure to include the following information in your bugreport:
</p>
<ul class="toc">
<li> A clear description of what you are trying to achieve and what the problem is.
</li><li> What platform (operating system, version, hardware architecture) and which version of tinc you use.
</li><li> If compiling tinc fails, a copy of &lsquo;<tt>config.log</tt>&rsquo; and the error messages you get.
</li><li> Otherwise, a copy of &lsquo;<tt>tinc.conf</tt>&rsquo;, &lsquo;<tt>tinc-up</tt>&rsquo; and all files in the &lsquo;<tt>hosts/</tt>&rsquo; directory.
</li><li> The output of the commands &lsquo;<samp>ifconfig -a</samp>&rsquo; and &lsquo;<samp>route -n</samp>&rsquo; (or &lsquo;<samp>netstat -rn</samp>&rsquo; if that doesn't work).
</li><li> The output of any command that fails to work as it should (like ping or traceroute).
</li></ul>
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<h1 class="chapter"> 6. Technical information </h1>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top"><a href="#SEC57">6.1 The connection</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#SEC60">6.2 The meta-protocol</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
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<h2 class="section"> 6.1 The connection </h2>
<p>Tinc is a daemon that takes VPN data and transmit that to another host
computer over the existing Internet infrastructure.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top"><a href="#SEC58">6.1.1 The UDP tunnel</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#SEC59">6.1.2 The meta-connection</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<h3 class="subsection"> 6.1.1 The UDP tunnel </h3>
<a name="IDX68"></a>
<p>The data itself is read from a character device file, the so-called
<em>virtual network device</em>. This device is associated with a network
interface. Any data sent to this interface can be read from the device,
and any data written to the device gets sent from the interface.
There are two possible types of virtual network devices:
`tun' style, which are point-to-point devices which can only handle IPv4 and/or IPv6 packets,
and `tap' style, which are Ethernet devices and handle complete Ethernet frames.
</p>
<p>So when tinc reads an Ethernet frame from the device, it determines its
type. When tinc is in it's default routing mode, it can handle IPv4 and IPv6
packets. Depending on the Subnet lines, it will send the packets off to their destination IP address.
In the `switch' and `hub' mode, tinc will use broadcasts and MAC address discovery
to deduce the destination of the packets.
Since the latter modes only depend on the link layer information,
any protocol that runs over Ethernet is supported (for instance IPX and Appletalk).
However, only `tap' style devices provide this information.
</p>
<p>After the destination has been determined,
the packet will be compressed (optionally),
a sequence number will be added to the packet,
the packet will then be encrypted
and a message authentication code will be appended.
</p>
<a name="IDX69"></a>
<a name="IDX70"></a>
<p>When that is done, time has come to actually transport the
packet to the destination computer. We do this by sending the packet
over an UDP connection to the destination host. This is called
<em>encapsulating</em>, the VPN packet (though now encrypted) is
encapsulated in another IP datagram.
</p>
<p>When the destination receives this packet, the same thing happens, only
in reverse. So it checks the message authentication code, decrypts the contents of the UDP datagram,
checks the sequence number
and writes the decrypted information to its own virtual network device.
</p>
<p>If the virtual network device is a `tun' device (a point-to-point tunnel),
there is no problem for the kernel to accept a packet.
However, if it is a `tap' device (this is the only available type on FreeBSD),
the destination MAC address must match that of the virtual network interface.
If tinc is in it's default routing mode, ARP does not work, so the correct destination MAC
can not be known by the sending host.
Tinc solves this by letting the receiving end detect the MAC address of its own virtual network interface
and overwriting the destination MAC address of the received packet.
</p>
<p>In switch or hub modes ARP does work so the sender already knows the correct destination MAC address.
In those modes every interface should have a unique MAC address, so make sure they are not the same.
Because switch and hub modes rely on MAC addresses to function correctly,
these modes cannot be used on the following operating systems which don't have a `tap' style virtual network device:
OpenBSD, NetBSD, Darwin and Solaris.
</p>
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<h3 class="subsection"> 6.1.2 The meta-connection </h3>
<p>Having only a UDP connection available is not enough. Though suitable
for transmitting data, we want to be able to reliably send other
information, such as routing and session key information to somebody.
</p>
<a name="IDX71"></a>
<p>TCP is a better alternative, because it already contains protection
against information being lost, unlike UDP.
</p>
<p>So we establish two connections. One for the encrypted VPN data, and one
for other information, the meta-data. Hence, we call the second
connection the meta-connection. We can now be sure that the
meta-information doesn't get lost on the way to another computer.
</p>
<a name="IDX72"></a>
<a name="IDX73"></a>
<p>Like with any communication, we must have a protocol, so that everybody
knows what everything stands for, and how she should react. Because we
have two connections, we also have two protocols. The protocol used for
the UDP data is the &ldquo;data-protocol,&rdquo; the other one is the
&ldquo;meta-protocol.&rdquo;
</p>
<p>The reason we don't use TCP for both protocols is that UDP is much
better for encapsulation, even while it is less reliable. The real
problem is that when TCP would be used to encapsulate a TCP stream
that's on the private network, for every packet sent there would be
three ACKs sent instead of just one. Furthermore, if there would be
a timeout, both TCP streams would sense the timeout, and both would
start re-sending packets.
</p>
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<h2 class="section"> 6.2 The meta-protocol </h2>
<p>The meta protocol is used to tie all tinc daemons together, and
exchange information about which tinc daemon serves which virtual
subnet.
</p>
<p>The meta protocol consists of requests that can be sent to the other
side. Each request has a unique number and several parameters. All
requests are represented in the standard ASCII character set. It is
possible to use tools such as telnet or netcat to connect to a tinc
daemon started with the &ndash;bypass-security option
and to read and write requests by hand, provided that one
understands the numeric codes sent.
</p>
<p>The authentication scheme is described in <a href="#SEC62">Authentication protocol</a>. After a
successful authentication, the server and the client will exchange all the
information about other tinc daemons and subnets they know of, so that both
sides (and all the other tinc daemons behind them) have their information
synchronised.
</p>
<a name="IDX74"></a>
<a name="IDX75"></a>
<table><tr><td>&nbsp;</td><td><pre class="example">message
------------------------------------------------------------------
ADD_EDGE node1 node2 21.32.43.54 655 222 0
| | | | | +-&gt; options
| | | | +----&gt; weight
| | | +--------&gt; UDP port of node2
| | +----------------&gt; real address of node2
| +-------------------------&gt; name of destination node
+-------------------------------&gt; name of source node
ADD_SUBNET node 192.168.1.0/24
| | +--&gt; prefixlength
| +--------&gt; network address
+------------------&gt; owner of this subnet
------------------------------------------------------------------
</pre></td></tr></table>
<p>The ADD_EDGE messages are to inform other tinc daemons that a connection between
two nodes exist. The address of the destination node is available so that
VPN packets can be sent directly to that node.
</p>
<p>The ADD_SUBNET messages inform other tinc daemons that certain subnets belong
to certain nodes. tinc will use it to determine to which node a VPN packet has
to be sent.
</p>
<a name="IDX76"></a>
<a name="IDX77"></a>
<table><tr><td>&nbsp;</td><td><pre class="example">message
------------------------------------------------------------------
DEL_EDGE node1 node2
| +----&gt; name of destination node
+----------&gt; name of source node
DEL_SUBNET node 192.168.1.0/24
| | +--&gt; prefixlength
| +--------&gt; network address
+------------------&gt; owner of this subnet
------------------------------------------------------------------
</pre></td></tr></table>
<p>In case a connection between two daemons is closed or broken, DEL_EDGE messages
are sent to inform the other daemons of that fact. Each daemon will calculate a
new route to the the daemons, or mark them unreachable if there isn't any.
</p>
<a name="IDX78"></a>
<a name="IDX79"></a>
<a name="IDX80"></a>
<table><tr><td>&nbsp;</td><td><pre class="example">message
------------------------------------------------------------------
REQ_KEY origin destination
| +--&gt; name of the tinc daemon it wants the key from
+----------&gt; name of the daemon that wants the key
ANS_KEY origin destination 4ae0b0a82d6e0078 91 64 4
| | \______________/ | | +--&gt; MAC length
| | | | +-----&gt; digest algorithm
| | | +--------&gt; cipher algorithm
| | +--&gt; 128 bits key
| +--&gt; name of the daemon that wants the key
+----------&gt; name of the daemon that uses this key
KEY_CHANGED origin
+--&gt; daemon that has changed it's packet key
------------------------------------------------------------------
</pre></td></tr></table>
<p>The keys used to encrypt VPN packets are not sent out directly. This is
because it would generate a lot of traffic on VPNs with many daemons, and
chances are that not every tinc daemon will ever send a packet to every
other daemon. Instead, if a daemon needs a key it sends a request for it
via the meta connection of the nearest hop in the direction of the
destination.
</p>
<a name="IDX81"></a>
<table><tr><td>&nbsp;</td><td><pre class="example">daemon message
------------------------------------------------------------------
origin PING
dest. PONG
------------------------------------------------------------------
</pre></td></tr></table>
<p>There is also a mechanism to check if hosts are still alive. Since network
failures or a crash can cause a daemon to be killed without properly
shutting down the TCP connection, this is necessary to keep an up to date
connection list. PINGs are sent at regular intervals, except when there
is also some other traffic. A little bit of salt (random data) is added
with each PING and PONG message, to make sure that long sequences of PING/PONG
messages without any other traffic won't result in known plaintext.
</p>
<p>This basically covers what is sent over the meta connection by tinc.
</p>
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<h2 class="section"> 6.3 Security </h2>
<a name="IDX82"></a>
<p>Tinc got its name from &ldquo;TINC,&rdquo; short for <em>There Is No Cabal</em>; the
alleged Cabal was/is an organisation that was said to keep an eye on the
entire Internet. As this is exactly what you <em>don't</em> want, we named
the tinc project after TINC.
</p>
<p>But in order to be &ldquo;immune&rdquo; to eavesdropping, you'll have to encrypt
your data. Because tinc is a <em>Secure</em> VPN (SVPN) daemon, it does
exactly that: encrypt.
Tinc by default uses blowfish encryption with 128 bit keys in CBC mode, 32 bit
sequence numbers and 4 byte long message authentication codes to make sure
eavesdroppers cannot get and cannot change any information at all from the
packets they can intercept. The encryption algorithm and message authentication
algorithm can be changed in the configuration. The length of the message
authentication codes is also adjustable. The length of the key for the
encryption algorithm is always the default length used by OpenSSL.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top"><a href="#SEC62">6.3.1 Authentication protocol</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#SEC63">6.3.2 Encryption of network packets</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#SEC64">6.3.3 Security issues</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
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<h3 class="subsection"> 6.3.1 Authentication protocol </h3>
<a name="IDX83"></a>
<p>A new scheme for authentication in tinc has been devised, which offers some
improvements over the protocol used in 1.0pre2 and 1.0pre3. Explanation is
below.
</p>
<a name="IDX84"></a>
<a name="IDX85"></a>
<a name="IDX86"></a>
<a name="IDX87"></a>
<table><tr><td>&nbsp;</td><td><pre class="example">daemon message
--------------------------------------------------------------------------
client &lt;attempts connection&gt;
server &lt;accepts connection&gt;
client ID client 12
| +---&gt; version
+-------&gt; name of tinc daemon
server ID server 12
| +---&gt; version
+-------&gt; name of tinc daemon
client META_KEY 5f0823a93e35b69e...7086ec7866ce582b
\_________________________________/
+-&gt; RSAKEYLEN bits totally random string S1,
encrypted with server's public RSA key
server META_KEY 6ab9c1640388f8f0...45d1a07f8a672630
\_________________________________/
+-&gt; RSAKEYLEN bits totally random string S2,
encrypted with client's public RSA key
From now on:
- the client will symmetrically encrypt outgoing traffic using S1
- the server will symmetrically encrypt outgoing traffic using S2
client CHALLENGE da02add1817c1920989ba6ae2a49cecbda0
\_________________________________/
+-&gt; CHALLEN bits totally random string H1
server CHALLENGE 57fb4b2ccd70d6bb35a64c142f47e61d57f
\_________________________________/
+-&gt; CHALLEN bits totally random string H2
client CHAL_REPLY 816a86
+-&gt; 160 bits SHA1 of H2
server CHAL_REPLY 928ffe
+-&gt; 160 bits SHA1 of H1
After the correct challenge replies are received, both ends have proved
their identity. Further information is exchanged.
client ACK 655 123 0
| | +-&gt; options
| +----&gt; estimated weight
+--------&gt; listening port of client
server ACK 655 321 0
| | +-&gt; options
| +----&gt; estimated weight
+--------&gt; listening port of server
--------------------------------------------------------------------------
</pre></td></tr></table>
<p>This new scheme has several improvements, both in efficiency and security.
</p>
<p>First of all, the server sends exactly the same kind of messages over the wire
as the client. The previous versions of tinc first authenticated the client,
and then the server. This scheme even allows both sides to send their messages
simultaneously, there is no need to wait for the other to send something first.
This means that any calculations that need to be done upon sending or receiving
a message can also be done in parallel. This is especially important when doing
RSA encryption/decryption. Given that these calculations are the main part of
the CPU time spent for the authentication, speed is improved by a factor 2.
</p>
<p>Second, only one RSA encrypted message is sent instead of two. This reduces the
amount of information attackers can see (and thus use for a cryptographic
attack). It also improves speed by a factor two, making the total speedup a
factor 4.
</p>
<p>Third, and most important:
The symmetric cipher keys are exchanged first, the challenge is done
afterwards. In the previous authentication scheme, because a man-in-the-middle
could pass the challenge/chal_reply phase (by just copying the messages between
the two real tinc daemons), but no information was exchanged that was really
needed to read the rest of the messages, the challenge/chal_reply phase was of
no real use. The man-in-the-middle was only stopped by the fact that only after
the ACK messages were encrypted with the symmetric cipher. Potentially, it
could even send it's own symmetric key to the server (if it knew the server's
public key) and read some of the metadata the server would send it (it was
impossible for the mitm to read actual network packets though). The new scheme
however prevents this.
</p>
<p>This new scheme makes sure that first of all, symmetric keys are exchanged. The
rest of the messages are then encrypted with the symmetric cipher. Then, each
side can only read received messages if they have their private key. The
challenge is there to let the other side know that the private key is really
known, because a challenge reply can only be sent back if the challenge is
decrypted correctly, and that can only be done with knowledge of the private
key.
</p>
<p>Fourth: the first thing that is sent via the symmetric cipher encrypted
connection is a totally random string, so that there is no known plaintext (for
an attacker) in the beginning of the encrypted stream.
</p>
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<h3 class="subsection"> 6.3.2 Encryption of network packets </h3>
<a name="IDX88"></a>
<p>A data packet can only be sent if the encryption key is known to both
parties, and the connection is activated. If the encryption key is not
known, a request is sent to the destination using the meta connection
to retrieve it. The packet is stored in a queue while waiting for the
key to arrive.
</p>
<p>The UDP packet containing the network packet from the VPN has the following layout:
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">... | IP header | UDP header | seqno | VPN packet | MAC | UDP trailer
\___________________/\_____/
| |
V +---&gt; digest algorithm
Encrypted with symmetric cipher
</pre></td></tr></table>
<p>So, the entire VPN packet is encrypted using a symmetric cipher, including a 32 bits
sequence number that is added in front of the actual VPN packet, to act as a unique
IV for each packet and to prevent replay attacks. A message authentication code
is added to the UDP packet to prevent alteration of packets. By default the
first 4 bytes of the digest are used for this, but this can be changed using
the MACLength configuration variable.
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<h3 class="subsection"> 6.3.3 Security issues </h3>
<p>In August 2000, we discovered the existence of a security hole in all versions
of tinc up to and including 1.0pre2. This had to do with the way we exchanged
keys. Since then, we have been working on a new authentication scheme to make
tinc as secure as possible. The current version uses the OpenSSL library and
uses strong authentication with RSA keys.
</p>
<p>On the 29th of December 2001, Jerome Etienne posted a security analysis of tinc
1.0pre4. Due to a lack of sequence numbers and a message authentication code
for each packet, an attacker could possibly disrupt certain network services or
launch a denial of service attack by replaying intercepted packets. The current
version adds sequence numbers and message authentication codes to prevent such
attacks.
</p>
<p>On the 15th of September 2003, Peter Gutmann posted a security analysis of tinc
1.0.1. He argues that the 32 bit sequence number used by tinc is not a good IV,
that tinc's default length of 4 bytes for the MAC is too short, and he doesn't
like tinc's use of RSA during authentication. We do not know of a security hole
in this version of tinc, but tinc's security is not as strong as TLS or IPsec.
We will address these issues in tinc 2.0.
</p>
<p>Cryptography is a hard thing to get right. We cannot make any
guarantees. Time, review and feedback are the only things that can
prove the security of any cryptographic product. If you wish to review
tinc or give us feedback, you are stronly encouraged to do so.
</p>
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<h1 class="chapter"> 7. Platform specific information </h1>
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