130 lines
5.7 KiB
Text
130 lines
5.7 KiB
Text
This is the README file for tinc version 1.0.2. Installation
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instructions may be found in the INSTALL file.
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tinc is Copyright (C) 1998-2004 by:
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Ivo Timmermans <ivo@tinc-vpn.org>,
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Guus Sliepen <guus@tinc-vpn.org>,
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and others.
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For a complete list of authors see the AUTHORS file.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version. See the file COPYING for more details.
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Security statement
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------------------
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In August 2000, we discovered the existence of a security hole in all versions
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of tinc up to and including 1.0pre2. This had to do with the way we exchanged
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keys. Since then, we have been working on a new authentication scheme to make
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tinc as secure as possible. The current version uses the OpenSSL library and
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uses strong authentication with RSA keys.
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On the 29th of December 2001, Jerome Etienne posted a security analysis of tinc
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1.0pre4. Due to a lack of sequence numbers and a message authentication code
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for each packet, an attacker could possibly disrupt certain network services or
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launch a denial of service attack by replaying intercepted packets. The current
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version adds sequence numbers and message authentication codes to prevent such
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attacks.
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On September the 15th of 2003, Peter Gutmann contacted us and showed us a
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writeup describing various security issues in several VPN daemons. He showed
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that tinc lacks perfect forward security, the connection authentication could
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be done more properly, that the sequence number we use as an IV is not the best
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practice and that the default length of the HMAC for packets is too short in
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his opinion. We do not know of a way to exploit these weaknesses, but we will
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address these issues in tinc 2.0.
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Cryptography is a hard thing to get right. We cannot make any
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guarantees. Time, review and feedback are the only things that can
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prove the security of any cryptographic product. If you wish to review
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tinc or give us feedback, you are stronly encouraged to do so.
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Changes to configuration file format since 1.0pre5
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--------------------------------------------------
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Some configuration variables have different names now. Most notably "TapDevice"
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should be changed into "Device", and "Device" should be changed into
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"BindToDevice".
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Compatibility
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-------------
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Version 1.0.2 is compatible with 1.0.1, 1.0 and 1.0pre8 but not with older versions
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of tinc.
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Requirements
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------------
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Since 1.0pre3, we use OpenSSL for all cryptographic functions. So you
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need to install this library first; grab it from
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http://www.openssl.org/. You will need version 0.9.7 or later. If
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this library is not installed on you system, configure will fail. The
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manual in doc/tinc.texi contains more detailed information on how to
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install this library.
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Since 1.0pre6, the zlib library is used for optional compression. You need this
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library whether or not you plan to enable the compression. You can find it at
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http://www.gzip.org/zlib/. Because of a possible exploit in earlier versions we
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recommand that you download version 1.1.4 or later.
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Since 1.0, the lzo library is also used for optional compression. You need this
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library whether or not you plan to enable compression. You can find it at
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http://www.oberhumer.com/opensource/lzo/.
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In order to compile tinc, you will need a GNU C compiler environment.
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Features
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--------
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This version of tinc supports multiple virtual networks at once. To
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use this feature, you may supply a netname via the -n or --net
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options. The standard locations for the config files will then be
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/etc/tinc/<net>/.
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tincd regenerates its encryption key pairs. It does this on the first
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activity after the keys have expired. This period is adjustable in the
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configuration file, and the default time is 3600 seconds (one hour).
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This version supports multiple subnets at once. They are also sorted
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on subnet mask size. This means that it is possible to have
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overlapping subnets on the VPN, as long as their subnet mask sizes
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differ.
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Since pre5, tinc can operate in several routing modes. The default mode,
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"router", works exactly like the older version, and uses Subnet lines to
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determine the destination of packets. The other two modes, "switch" and "hub",
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allow the tinc daemons to work together like a single network switch or hub.
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This is useful for bridging networks. The latter modes only work properly on
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Linux, FreeBSD and Windows.
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The algorithms used for encryption and generating message authentication codes
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can now be changed in the configuration files. All cipher and digest algorithms
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supported by OpenSSL can be used. Useful ciphers are "blowfish" (default),
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"bf-ofb", "des", "des3", etcetera. Useful digests are "sha1" (default), "md5",
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etcetera.
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Support for routing IPv6 packets has been added. Just add Subnet lines with
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IPv6 addresses (without using :: abbreviations) and use ifconfig or ip (from
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the iproute package) to give the virtual network interface corresponding IPv6
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addresses. tinc does not provide autoconfiguration for IPv6 hosts, if you need
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it use radvd or zebra. Tunneling IPv6 packets only works on Linux, FreeBSD,
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Windows and possibly OpenBSD.
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It is also possible to make tunnels to other tinc daemons over IPv6 networks,
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if the operating system supports IPv6. tinc will automatically use both IPv6
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and IPv4 when available, but this can be changed by adding the option
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"AddressFamily = ipv4" or "AddressFamily = ipv6" to the tinc.conf file.
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Normally, when started tinc will detach and run in the background. In a native
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Windows environment this means tinc will intall itself as a service, which will
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restart after reboots. To prevent tinc from detaching or running as a service,
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use the -D option.
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