Add description of new authentication scheme.

[tinc] / README

diff --git a/README b/README
index 8f2e47b..1024d60 100644 (file)
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+++ b/README
@@ -1,33 +1,122 @@
-This is the README file for tinc version 0.3.
-Installation instructions may be found in the INSTALL file.
+This is the README file for tinc version 1.0.1. Installation
+instructions may be found in the INSTALL file.

 
 

-tinc is Copyright (C) 1998,99 Ivo Timmermans <zarq@iname.com> and
-others. For a complete list of authors see the AUTHORS file.
-This product includes software developed by Eric Young (eay@mincom.oz.au)
+tinc is Copyright (C) 1998-2003 by:
+
+Ivo Timmermans <ivo@o2w.nl>,
+Guus Sliepen <guus@sliepen.eu.org>,
+and others.
+
+For a complete list of authors see the AUTHORS file.

 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or (at
 your option) any later version. See the file COPYING for more details.
 
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or (at
 your option) any later version. See the file COPYING for more details.
 

-This version of tinc relies on the GNU Multi-Precision Library
-(gmp). This library is available from your nearest GNU mirror. Please
-install this first even before trying to run configure. If you don't
-do this, configure will (hopefully) mention it to you.
+
+Security statement
+------------------
+
+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.
+
+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.
+
+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.
+
+
+Changes to configuration file format since 1.0pre5
+--------------------------------------------------
+
+Some configuration variables have different names now. Most notably "TapDevice"
+should be changed into "Device", and "Device" should be changed into
+"BindToDevice".
+
+Compatibility
+-------------
+
+Version 1.0.1 is compatible with 1.0 and 1.0pre8 but not with older versions
+of tinc.
+
+
+Requirements
+------------
+
+Since 1.0pre3, we use OpenSSL for all cryptographic functions.  So you
+need to install this library first; grab it from
+http://www.openssl.org/.  You will need version 0.9.7 or later.  If
+this library is not installed on you system, configure will fail.  The
+manual in doc/tinc.texi contains more detailed information on how to
+install this library.
+
+Since 1.0pre6, the zlib library is used for optional compression. You need this
+library whether or not you plan to enable the compression. You can find it at
+http://www.gzip.org/zlib/. Because of a possible exploit in earlier versions we
+recommand that you download version 1.1.4 or later.
+
+Since 1.0, the lzo library is also used for optional compression. You need this
+library whether or not you plan to enable compression. You can find it at
+http://www.oberhumer.com/opensource/lzo/.
+
+In order to compile tinc, you will need a GNU C compiler environment.
+
+
+Features
+--------

 
 This version of tinc supports multiple virtual networks at once. To
 use this feature, you may supply a netname via the -n or --net
 options. The standard locations for the config files will then be
 /etc/tinc/<net>/.
 
 
 This version of tinc supports multiple virtual networks at once. To
 use this feature, you may supply a netname via the -n or --net
 options. The standard locations for the config files will then be
 /etc/tinc/<net>/.
 

-In this version, MAC addresses are stripped off before encoding and
-sending a packet. When the packet reaches its destination, the MAC
-addresses are rebuilt again. They then have the form
-FE:FD:aa:bb:cc:dd. aa, bb, cc and dd are taken from the destination
-and source IP address.
-

 tincd regenerates its encryption key pairs. It does this on the first
 activity after the keys have expired. This period is adjustable in the
 tincd regenerates its encryption key pairs. It does this on the first
 activity after the keys have expired. This period is adjustable in the

-configuration file, and the default time is 3600 seconds (one
-hour). If you send a USR2 signal to the daemon, it'll regenerate
-immediately.
+configuration file, and the default time is 3600 seconds (one hour).
+
+This version supports multiple subnets at once. They are also sorted
+on subnet mask size. This means that it is possible to have
+overlapping subnets on the VPN, as long as their subnet mask sizes
+differ.
+
+Since pre5, tinc can operate in several routing modes. The default mode,
+"router", works exactly like the older version, and uses Subnet lines to
+determine the destination of packets. The other two modes, "switch" and "hub",
+allow the tinc daemons to work together like a single network switch or hub.
+This is useful for bridging networks. The latter modes only work properly on
+Linux, FreeBSD and Windows.
+
+The algorithms used for encryption and generating message authentication codes
+can now be changed in the configuration files. All cipher and digest algorithms
+supported by OpenSSL can be used. Useful ciphers are "blowfish" (default),
+"bf-ofb", "des", "des3", etcetera. Useful digests are "sha1" (default), "md5",
+etcetera.
+
+Support for routing IPv6 packets has been added. Just add Subnet lines with
+IPv6 addresses (without using :: abbreviations) and use ifconfig or ip (from
+the iproute package) to give the virtual network interface corresponding IPv6
+addresses. tinc does not provide autoconfiguration for IPv6 hosts, if you need
+it use radvd or zebra. Tunneling IPv6 packets only works on Linux, FreeBSD,
+Windows and possibly OpenBSD.
+
+It is also possible to make tunnels to other tinc daemons over IPv6 networks,
+if the operating system supports IPv6.  tinc will automatically use both IPv6
+and IPv4 when available, but this can be changed by adding the option
+"AddressFamily = ipv4" or "AddressFamily = ipv6" to the tinc.conf file.
+
+Normally, when started tinc will detach and run in the background. In a native
+Windows environment this means tinc will intall itself as a service, which will
+restart after reboots.  To prevent tinc from detaching or running as a service,
+use the -D option.
+