OpenVPN Copyright (C) 2002-2005 OpenVPN Solutions LLC $Id$ 2005.09.25 -- Version 2.0.3-rc1 * openvpn_plugin_abort_v1 function wasn't being properly registered on Windows. * Fixed a bug where --mode server --proto tcp-server --cipher none operation could cause tunnel packet truncation. 2005.08.25 -- Version 2.0.2 * No change from 2.0.2-rc1. 2005.08.24 -- Version 2.0.2-rc1 * Fixed regression bug in Win32 installer, introduced in 2.0.1, which incorrectly set OpenVPN service to autostart. * Don't package source code zip file in Windows installer in order to reduce the size of the installer. The source zip file can always be downloaded separately if needed. * Fixed bug in route.c in FreeBSD, Darwin, OpenBSD and NetBSD version of get_default_gateway. Allocated socket for route manipulation is never freed so number of mbufs continuously grow and exhaust system resources after a while (Jaroslav Klaus). * Fixed bug where "--proto tcp-server --mode p2p --management host port" would cause the management port to not respond until the OpenVPN peer connects. * Modified pkitool script to be /bin/sh compatible (Johnny Lam). 2005.08.16 -- Version 2.0.1 * Security Fix -- DoS attack against server when run with "verb 0" and without "tls-auth". If a client connection to the server fails certificate verification, the OpenSSL error queue is not properly flushed, which can result in another unrelated client instance on the server seeing the error and responding to it, resulting in disconnection of the unrelated client (CAN-2005-2531). * Security Fix -- DoS attack against server by authenticated client. This bug presents a potential DoS attack vector against the server which can only be initiated by a connected and authenticated client. If the client sends a packet which fails to decrypt on the server, the OpenSSL error queue is not properly flushed, which can result in another unrelated client instance on the server seeing the error and responding to it, resulting in disconnection of the unrelated client (CAN-2005-2532). * Security Fix -- DoS attack against server by authenticated client. A malicious client in "dev tap" ethernet bridging mode could theoretically flood the server with packets appearing to come from hundreds of thousands of different MAC addresses, causing the OpenVPN process to deplete system virtual memory as it expands its internal routing table. A --max-routes-per-client directive has been added (default=256) to limit the maximum number of routes in OpenVPN's internal routing table which can be associated with a given client (CAN-2005-2533). * Security Fix -- DoS attack against server by authenticated client. If two or more client machines try to connect to the server at the same time via TCP, using the same client certificate, and when --duplicate-cn is not enabled on the server, a race condition can crash the server with "Assertion failed at mtcp.c:411" (CAN-2005-2534). * Fixed server bug where under certain circumstances, the client instance object deletion function would try to delete iroutes which had never been added in the first place, triggering "Assertion failed at mroute.c:349". * Added --auth-retry option to prevent auth errors from being fatal on the client side, and to permit username/password requeries in case of error. Also controllable via new "auth-retry" management interface command. See man page for more info. * Added easy-rsa 2.0 scripts to the tarball in easy-rsa/2.0 * Fixed bug in openvpn.spec where rpmbuild --define 'without_pam 1' would fail to build. * Implement "make check" to perform loopback tests (Matthias Andree). 2005.07.21 -- Version 2.0.1-rc7 * Support LZO 2.01 which renamed its library to lzo2 (Matthias Andree). * Include linux/types.h before checking for linux/errqueue.h (Matthias Andree). 2005.07.15 -- Version 2.0.1-rc6 * Commented out "user nobody" and "group nobody" in sample client/server config files. * Allow '@' character to be used in --client-config-dir file names. 2005.07.04 -- Version 2.0.1-rc5 * Windows version will log a for-further-info URL when initialization sequence is completed with errors. * Added DLOPEN_PAM parameter to plugin/auth-pam/Makefile to control whether auth-pam plugin links to PAM via dlopen or -lpam. By default, DLOPEN_PAM=1 so pre-existing behavior should be preserved. DLOPEN_PAM=0 is the preferred setting to link via -lpam, but DLOPEN_PAM=1 works around a bug in SuSE 9.1 (and possibly other distros as well) where the PAM modules are not linked with -lpam. See thread on openvpn-devel for more discussion about this patch (Simon Perreault). 2005.06.15 -- Version 2.0.1-rc4 * Support LZO 2.00, including changes to configure script to autodetect LZO version. 2005.06.12 -- Version 2.0.1-rc3 * Fixed a bug which caused standard file handles to not be closed after daemonization when --plugin and --daemon are used together, and if the plugin initialization function forks (as does auth-pam and down-root) (Simon Perreault). * Added client-side up/down scripts in contrib/pull-resolv-conf for accepting server-pushed "dhcp-option DOMAIN" and "dhcp-option DNS" on Linux/Unix systems (Jesse Adelman). * Fixed bug where if client-connect scripts/plugins were cascaded, and one (but not all) of them returned an error status, there might be cases where for an individual script/plugin, client-connect was called but not client-disconnect. The goal of this fix is to ensure that if client-connect is called on a given client instance, then client-disconnect will definitely be called. A potential complication of this fix is that when client-connect functions are cascaded, it's possible that the client-disconnect function would be called in cases where the related client-connect function returned an error status. This fix should not alter OpenVPN behavior when scripts/plugins are not cascaded. * Changed the hard-to-reproduce "Assertion failed at fragment.c:312" fatal error to a warning: "FRAG: outgoing buffer is not empty". Need more info on how to reproduce this one. * When --duplicate-cn is used, the --ifconfig-pool allocation algorithm will now allocate the first available IP address. * When --daemon and --management-hold are used together, OpenVPN will daemonize before it enters the management hold state. 2005.05.16 -- Version 2.0.1-rc2 * Modified vendor test in openvpn.spec file to match against "Mandrakesoft" in addition to "MandrakeSoft". * Using --iroute in a --client-config-dir file while in --dev tap mode is not currently supported and will produce a warning message. Fixed bug where in certain cases, in addition to generating a warning message, this combination of options would also produce a fatal assertion in mroute.c. * Pass --auth-user-pass username to server-side plugin without performing any string remapping (plugins, unlike scripts, don't get any security benefit from string remapping). This is intended to fix an issue with openvpn-auth-pam/pam_winbind where backslash characters in a username ('\') were being remapped to underscore ('_'). * Updated OpenSSL DLLs in Windows build to 0.9.7g. * Documented --explicit-exit-notify in man page. * --explicit-exit-notify seconds parameter defaults to 1 if unspecified. 2005.04.30 -- Version 2.0.1-rc1 * Fixed bug where certain kinds of fatal errors after initialization (such as port in use) would leave plugin processes (such as openvpn-auth-pam) still running. * Added optional openvpn_plugin_abort_v1 plugin function for closing initialized plugin objects in the event of a fatal error by main OpenVPN process. * When the --remote list is > 1, and --resolv-retry is not specified (meaning that it defaults to "infinite"), apply the infinite timeout to the --remote list as a whole, but try each list item only once before moving on to the next item. * Added new --syslog directive which redirects output to syslog without requiring the use of the --daemon or --inetd directives. * Added openvpn.spec option to allow RPM to be built with support for passwords read from a file: rpmbuild -tb [openvpn.x.tar.gz] --define 'with_password_save 1' 2005.04.17 -- Version 2.0 * Fixed minor options string typo in options.c. 2005.04.10 -- Version 2.0-rc21 * Change license description from "GPL Version 2 or (at your option) any later version" to just "GPL Version 2". 2005.04.04 -- Version 2.0-rc20 * Dag Wieers has put together an OpenVPN/LZO binary RPM set with excellent distro/version coverage for RH/EL/Fedora, though using his own SPEC. I modified openvpn.spec to follow some of the same conventions such as putting sample scripts and doc files in %doc rather than /usr/share/openvpn. * Minor change to init scripts to run the user-defined script /etc/openvpn/openvpn-startup (if it exists) before any OpenVPN configs are started, and to run /etc/openvpn/openvpn-shutdown after all OpenVPN configs have been stopped. The openvpn-startup script can be used for stuff like insmod tun.o, setting up firewall rules, or starting ethernet bridges. 2005.03.29 -- Version 2.0-rc19 * Omit additions of routes where the network and gateway are equal and the netmask is 255.255.255.255. This can come up if you are using both server/ifconfig-pool and client-config-dir with ifconfig-push static addresses for some subset of clients which directly reference the server IP address as the remote endpoint. 2005.03.28 -- Version 2.0-rc18 * Packaged Windows installer with OpenSSL 0.9.7f. * Built Windows installer with NSIS 2.06. 2005.03.12 -- Version 2.0-rc17 * "MANAGEMENT: CMD" log file output will now only occur at --verb 7 or greater. * Added an optional name/value configuration list to the openvpn-auth-pam plugin module argument list. See plugin/auth-pam/README for documentation. This is necessary in order for openvpn-auth-pam to work with queries generated by arbitrary PAM modules. * In both auth-pam and down-root plugins, in the forked process, a read error on the parent process socket is no longer fatal. * MandrakeSoft liblzo1 RPM only Provides for a 'liblzo1'. A conditional test of the vendor has been added to Require the appropriately named 'lzo' (liblzo1 / lzo). (Tom Walsh - http://openhardware.net) 2005.02.20 -- Version 2.0-rc16 * Fixed bug introduced in rc13 where Windows service wrapper would be installed with a startup type of Automatic. This fix restores the previous behavior of installing with a startup type of Manual. 2005.02.19 -- Version 2.0-rc15 * Added warning when --keepalive is not used in a server configuration. * Don't include OpenSSL md4.h file if we are not building NTLM proxy support (Waldemar Brodkorb). * Added easy-rsa/build-key-pkcs12 and easy-rsa/Windows/build-key-pkcs12.bat scripts (Mathias Sundman). 2005.02.16 -- Version 2.0-rc14 * Fixed small memory leak that occurs when --crl-verify is used. * Upgraded Windows installer and .nsi script to NSIS 2.05 (Mathias Sundman). * Changed #include backslash usage in cryptoapi.c to use forward slashes instead (Gisle Vanem). * Created easy-rsa/revoke-full to handle revocations in a single step: (a) revoke crt, (b) regenerate CRL, and (c) verify that revocation succeeded. * Renamed easy-rsa/Windows/revoke-key to revoke-full so that both *nix and Windows scripts are equivalent. 2005.02.11 -- Version 2.0-rc13 * Improve human-readability of local/remote options diff, when inconsistencies are present. * For Windows easy-rsa, distribute vars.bat.sample and openssl.cnf.sample, then copy them to their normal filenames (without the .sample) when init-config.bat is run. This is to prevent OpenVPN upgrades from wiping out vars.bat and openssl.cnf edits. * Modified service wrapper (Windows) to use a case-insensitive search when scanning for .ovpn files in \Program Files\OpenVPN\config. Prior versions required an all-lower-case .ovpn file extension. * Miscellaneous service wrapper code cleanup. * If --user/--group is used on Windows, treat it as a no-op with a warning (this makes it easier to distribute the same client config file to Windows and *nix users). * Warn if --ifconfig-pool-persist is used with --duplicate-cn. 2005.02.05 -- Version 2.0-rc12 * Removed some debugging code inadvertently included in rc11 which would print the --auth-user-pass username/password provided by clients in the server logfile. * Client code for cycling through --remote list will retry the last address which successfully authenticated before moving on through the list. * Windows installer will now install sample configuration files in \Program Files\OpenVPN\sample-configs as well as generate a start menu shortcut to this directory. * Minor type change in buffer.[ch] to work around char-type ambiguity bug. Caused management interface lock-ups on ARM when building with armv4b-hardhat-linux-gcc 2.95.3. 2005.02.03 -- Version 2.0-rc11 * Windows installer will now install easy-rsa directory in \Program Files\OpenVPN * Allow syslog facility to be controlled at compile time, e.g. -DLOG_OPENVPN=LOG_LOCAL6 (P Kern). * Changed certain shell scripts in distribution to use #!/bin/sh rather than #!/bin/bash for better portability. * If --ifconfig-pool-persist seconds parameter is 0, treat persist file as an allocation of fixed IP addresses (previous versions took IP-to-common-name associations from this list as hints, not mandatory static allocations). * Fixed bug on *nix where if --auth-user-pass and --log were used together, the username prompt would be sent to the log file rather than /dev/tty. * Spurious text in openvpn.8 detected by doclifter (Eric S. Raymond). * Call closelog later on daemon kill so that process exit message is written to syslog. 2005.01.27 -- Version 2.0-rc10 * When ./configure is run with plugins enabled (the default), check whether or not dlopen exists in libc before testing for libdl. This is to fix an issue on FreeBSD and possibly other OSes which bundle libdl functions in libc. * On Windows, filter initial WSAEINVAL warning which occurs on the initial read attempt of an unbound socket. * The easy-rsa scripts build-key, build-key-pass, and build-key-server will now chmod the .key file to 0600. This is in addition to the fact the generated keys directory has always been similarly protected (Pete Harlan). 2005.01.23 -- Version 2.0-rc9 * Fixed error "ROUTE: route addition failed using CreateIpForwardEntry ..." on Windows when --redirect-gateway is used over a RRAS internet link. * When using --route-method exe on Windows, include the gateway parameter on route delete commands (Mathias Sundman). * Try not to do a hard reset (i.e. SIGHUP) when two SIGUSR1 signals are received in close succession. * If the push list tries to grow beyond its buffer capacity, the resulting error will be non-fatal. * To increase the push list capacity (must be done on both client and server), increase TLS_CHANNEL_BUF_SIZE in common.h (default=1024). 2005.01.15 -- Version 2.0-rc8 * Fixed bug introduced in rc7 where options error "--auth-user-pass requires --pull" might occur even if --pull was correctly specified. * Changed management interface code to bind once to TCP socket, rather than rebinding after every client disconnect. * Added "disable" directive for client-config-dir files. * Windows binary install is now distributed with OpenSSL 0.9.7e. * Query the management interface for --http-proxy username/password if authfile is set to "stdin". * Added current OpenVPN version number to "Unrecognized option or missing parameter" error message. * Added "-extensions server" to "openssl req" command in easy-rsa/build-key-server (Nir Yeffet). 2005.01.10 -- Version 2.0-rc7 * Fixed bug in management interface which could cause 100% CPU utilization in --proto tcp-server mode on all *nix OSes except for Linux 2.6. * --ifconfig-push now accepts DNS names as well as IP addresses. * Added sanity check errors when --pull or --auth-user-pass is used in an incorrect mode. * Updated man page entries for --client-connect and --ifconfig-push. * Added "String Types and Remapping" section to man page to consisely document the way which OpenVPN may convert certain types of characters in strings to ('_'). * Modified bridging description in HOWTO to emphasize the fact that bridging allows Windows file and print sharing without a WINS server (Charles Duffy). 2004.12.20 -- Version 2.0-rc6 * Improved checking for epoll support in ./configure to fix false positive on RH9 (Jan Just Keijser). * Made the "MULTI TCP: I/O wait required blocking in multi_tcp_action, action=7" error nonfatal and replaced with "MULTI: Outgoing TUN queue full, dropped packet". So far the issue only seems to occur on Linux 2.2 in --mode server --proto tcp mode. It occurs when the TUN/TAP driver locks up and refuses to accept new packet writes for a second or more. * Fixed bug where if a --client-config-dir file tried to include another file using "config", and if that include failed, OpenVPN would abort with a fatal error. Now such inclusion failures will be logged but are no longer fatal. * Global changes to the way that packet buffer alignment is handled. Previously we didn't care about alignment and took care, when handling 16 and 32 bit words in buffers, to always use alignment-safe transfers. This approach appears to be inadequate on some architectures such as alpha. The new approach is to initialize packet buffers in a way that anticipates how component structures will be allocated within them, to maintain correct alignment. * Added --dhcp-option DISABLE-NBT to disable NetBIOS over TCP (Jan Just Keijser). * Added --http-proxy-option directive for controlling miscellaneous HTTP proxy options. * Management state will no longer transition to "WAIT" during TLS renegotiations. 2004.12.16 -- Version 2.0-rc5 * The --client-config-dir option will now try to open a default file called "DEFAULT" if no file matching the common name of the incoming client was found. * The --client-connect script/plugin can now veto client authentication by returning a failure code. * The --learn-address script/plugin can now prevent a client-instance/address association from being learned by returning a failure code. * Changed RPM group in .spec file to Applications/Internet. 2004.12.14 -- Version 2.0-rc4 * SuSE only -- Fixed interaction between openvpn.spec and suse/openvpn.init where the .spec file was writing the OpenVPN binary to a different location than where the .init script was referencing it (Stefan Engel). * Solaris only -- Split Solaris ifconfig command into two parts (Jan Just Keijser). * Some cleanup in add_option(). * Better error checking on input dotted quad IP addresses. * Verify that --push argument is quoted, if there is more than one. * More miscellaneous option sanity checks. 2004.12.13 -- Version 2.0-rc3 * On Windows, when --log or --log-append is used, save the original stderr for username and password prompts. * Fixed a bug introduced in the late 2.0 betas where if a "verb" parameter >= 16 was used, it would be ignored and the actual verb level would remain at 1. * Fixed a bug mostly seen on OS X where --management-hold or --management-query-passwords would cause the management interface to be unresponsive to incoming client connections. * Trigger an options error if one of the management-modifying options is used without "management" itself. 2004.12.12 -- Version 2.0-rc2 * Amplified warnings in documentation about possible man-in-the-middle attack when clients do not properly verify server certificate. Changes to easy-rsa README, FAQ, HOWTO, man page, and sample client config file. * Added a warning message if --tls-client or --client is used without also specifying one of either --ns-cert-type, --tls-remote, or --tls-verify. * status_open() fixes for MSVC builds (Blaine Fleming). * Fix attempt of "ntlm.c:55: error: `des_cblock' undeclared" compiler error which has been reported on some platforms. * The openvpn.spec file for rpmbuild has several new build-time options. See comments in the file. * Plugins are now built and packaged in the RPM and will be saved in /usr/share/openvpn/plugin/lib. * Added --management-hold directive to start OpenVPN in a hibernating state until released by the management interface. Also added "hold" command to the management interface. 2004.12.07 -- Version 2.0-rc1 * openvpn.spec workaround for SuSE confusion regarding /etc/init.d vs. /etc/rc.d/init.d (Stefan Engel). 2004.12.05 -- Version 2.0-beta20 * The ability to read --askpass and --auth-user-pass passwords from a file has been disabled by default. To re-enable, use ./configure --enable-password-save. * Added additional pre-connected states to management interface. See management/management-notes.txt for more info. * State history is now recorded by the management interface, and the "state" command now works like the log or echo commands. * State history and real-time state change notifications are now prepended with an integer unix timestamp. * Added --http-proxy-timeout option, previously the timeout was hardcoded to 5 seconds. 2004.12.02 -- Version 2.0-beta19 * Fixed bug in management interface line termination where output lines incorrectly contained a \00 char after the customary \0d \0a. * Fixed bug introduced in beta18 where Windows version would segfault on options errors. * Fixed bug in management interface where an empty quoted string ("") entered as a parameter would cause a segfault. * Fixed bug where --resolv-retry was not working properly with multiple --remote hosts. * Added additional ./configure options to reduce executable size for embedded applications. See ./configure --help. 2004.11.28 -- Version 2.0-beta18 * Added management interface. See new --management-* options or the full management interface documentation in management/management-notes.txt in the tarball. Management interface inclusion can be disabled by ./configure --disable-management. * Added two new plugin modules: auth-pam and down-root. Auth-pam supports pam-based authentication using a split privilege execution model, while down-root enables a down script to be executed with root privileges, even when --user/--group is used to drop root privileges. See the plugin directory in the tarball for READMEs, source code, and Makefiles. * Plugin developers should note that some changes were made to the plugin interface since beta17. See openvpn-plugin.h for details. Plugin interface inclusion can be disabled with ./configure --disable-plugins * Added easy-rsa/build-key-server script which will build a certificate with with nsCertType=server. * Added --ns-cert-type option for verification of nsCertType field in peer certificate. * If --fragment n is specified and --mssfix is specified without a parameter, default --mssfix to n. This restores the 1.6 behavior when using --mssfix without a parameter. * Fixed SSL context initialization bug introduced in beta14 where this error might occur on restarts: "Cannot load certificate chain ... PEM_read_bio:no start line". 2004.11.11 -- Version 2.0-beta17 * Changed default port number to 1194 per IANA official port number assignment. * Added --plugin directive which allows compiled modules to intercept script callbacks. See plugin folder in tarball for more info. * Fixed bug introduced in beta12 where --key-method 1 authentications which should have succeeded would fail. * Ignore SIGUSR1 during DNS resolution. * Added SuSE support to openvpn.spec (Umberto Nicoletti). * Fixed --cryptoapicert SUBJ: parsing bug (Peter 'Luna' Runestig). 2004.11.07 -- Version 2.0-beta16 * Modified sample-scripts/auth-pam.pl to get username and password from OpenVPN via a file rather than via environmental variables. * Added bytes_sent and bytes_received environmental variables to be set prior to client-disconnect script. * Changed client virtual IP derivation precedence: (1) use --ifconfig-push directive from --client-connect script, (2) use --ifconfig-push directive from --client-config-dir, and (3) use --ifconfig-pool address. * If a --client-config-dir file specifies --ifconfig-push, it will be visible to the --client-connect-script in the ifconfig_pool_remote_ip environmental variable. * For tun-style tunnels, the ifconfig_pool_local_ip environmental variable will be set, while for tap-style tunnels, the ifconfig_pool_netmask variable will be set. * Added intelligence to autoconf script to test compiler for the accepted form of zero-length arrays. * Fixed a bug introduced in beta12 where --ip-win32 netsh would fail if --dev-node was not explicitly specified. * --ip-win32 netsh will now work on hidden adapters. * Fix attempt of "Assertion failed at crypto.c:149". This assertion has also been reported on 1.x with a slightly different line number. The fix is twofold: (1) In previous releases, --mtu-test may trigger this assertion -- this bug has been fixed. (2) If something else causes the assertion to be thrown, don't panic, just output a nonfatal warning to the log and drop the packet which generated the error. * Support TAP interfaces on Mac OS X (Waldemar Brodkorb). * Added --echo directive. * Added --auth-nocache directive. 2004.10.28 -- Version 2.0-beta15 * Changed environmental variable character classes so that names must consist of alphanumeric or underbar chars and values must consist of printable characters. Illegal chars will be deleted. Versions prior to 2.0-beta12 were more restrictive and would map spaces to '.'. * On Windows, when the TAP adapter fails to initialize with the correct IP address, output "Initialization Sequence Completed with Errors" to the console or log file. * Added a warning when user/group/chroot is used without persist-tun and persist-key. * Added cryptoapi.[ch] to tarball and source zip. * --tls-remote option now works with common name prefixes as well as with the full X509 subject string. This is a useful alternative to using a CRL on the client. * common names associated with a static --ifconfig-push setting will no longer leave any state in the --ifconfig-pool-persist file. * Hard TLS errors (TLS handshake failed) will now trigger either a SIGUSR1 signal by default or SIGTERM (if --tls-exit is specified). In TCP mode, all TLS errors are considered to be hard. In server mode, the signal will be local to the client instance. * Added method parameter to --auth-user-pass-verify directive to select whether username/password is passed to script via environment or a temporary file. * Added --status-version option to control format of --status file. The --mode server --status-version 2 format now includes a line type token, the virtual IP address is shown in the client list (even in --dev tap mode), and the integer time_t value is shown anywhere an ascii-formatted time/date is also shown. * Added --remap-usr1 directive which can be used to control whether internally or externally generated SIGUSR1 signals are remapped to SIGHUP (restart without persisting state) or SIGTERM (exit). * When running as a Windows service (using --service option), check the exit event before and after reading one line of input from stdin, when reading username/password info. * For developers: Extended the --gremlin function to better stress-test the new 2.0 features, added Valgrind support on Linux and Dmalloc support on Windows. 2004.10.19 -- Version 2.0-beta14 * Fixed a bug introduced in Beta12 that would occur if you use a --client-connect script without also defining --tmp-dir. * Fixed a bug introduced in Beta12 where a learn-address script might segfault on the delete method. * Added Crypto API support in Windows version via the --cryptoapicert option (Peter 'Luna' Runestig). 2004.10.18 -- Version 2.0-beta13 * Fixed an issue introduced in Beta12 where the private key password would not be prompted for unless --askpass was explicitly specified in the config. 2004.10.17 -- Version 2.0-beta12 * Added support for username/password-based authentication. Clients can now authentication themselves with the server using either a certificate, a username/password, or both. New directives: --auth-user-pass, --auth-user-pass-verify, --client-cert-not-required, and --username-as-common-name. * Added NTLM proxy patch (William Preston). * Added --ifconfig-pool-linear server flag to allocate individual tun addresses for clients rather than /30 subnets (won't work with Windows clients). * Modified --http-proxy code to cache username/password across restarts. * Modified --http-proxy code to read username/password from the console when the auth file is given as "stdin". * Modified --askpass to take an optional filename argument. * --persist-tun and --persist-key now work in client mode and can be pushed to clients as well. * Added --ifconfig-pool-persist directive, to maintain ifconfig-pool info in a file which is persistent across daemon instantiations. * --user and --group privilege downgrades as well as --chroot now also work in client mode (the dowgrade/chroot will be delayed until the initialization sequence is completed). * Added --show-engines standalone directive to show available OpenSSL crypto accelerator engine support. * --engine directive now accepts an optional engine-ID parameter to control which engine is used. * "Connection reset, restarting" log message now shows which client is being reset. * Added --dhcp-pre-release directive in Windows version. * Second parm to --ip-win32 can be "default", e.g. --ip-win32 dynamic default 60. * Fixed documentation bug regarding environmental variable settings for --ifconfig-pool IP addresses. The correct environmental variable names are: ifconfig_pool_local_ip and ifconfig_pool_remote_ip. * ifconfig_pool_local_ip and ifconfig_pool_remote_ip environmental variables are now passed to the client-disconnect script. * In server mode, environmental variables are now scoped according to the client they are associated with, to solve the problem of "crosstalk" between different client's environmental variable sets. * Added --down-pre flag to cause --down script to be called before TUN/TAP close (rather than after). * Added --tls-exit flag which will cause OpenVPN to exit on any TLS errors. * Don't push a route to a client if it exactly matches an iroute (this lets you push routes to all clients, and OpenVPN will automatically remove the route from the route push list only for that client which the route actually belongs to). * Made '--resolv-retry infinite' the default. --resolv-retry can be disabled by using a parameter of 0. * For clients which plan to pull config info from server, set an initial default ping-restart of 60 seconds. * Optimized mute code to lessen the load on the processor when messages are being muted at a higher frequency. * Made route log messages non-mutable. * Silence the Linux "No buffer space available" message. * Added miscellaneous additional option sanity checks. * Added Windows version of easy-rsa scripts in easy-rsa/Windows directory (Andrew J. Richardson). * Added NetBSD route patch (Ed Ravin). * Added OpenBSD patch for TAP + --redirect-gateway (Waldemar Brodkorb). * Directives which prompt for a username and/or password will now work with --daemon (OpenVPN will prompt before forking). * Warn if CRL is from a different issuer than the issuer of the peer certificate (Bernhard Weisshuhn). * Changed init script chkconfig parameters to start OpenVPN daemon(s) before NFS. * Bug fix attempt of "too many I/O wait events" which occurs on OSes which prefer select() over poll() such as Mac OS X. * Added --ccd-exclusive flag. This flag will require, as a condition of authentication, that a connecting client has a --client-config-dir file. * TAP-Win32 open code will attempt to open a free adapter if --dev-node is not specified (Mathias Sundman). * Resequenced --nice and --chroot ordering so that --nice occurs first. * Added --suppress-timestamps flag (Charles Duffy). * Source code changes to allow compilation by MSVC (Peter 'Luna' Runestig). * Added experimental --fast-io flag which optimizes TUN/TAP/UDP writes on non-Windows systems. 2004.08.18 -- Version 2.0-beta11 * Added --server, --server-bridge, --client, and --keepalive helper directives. See client.conf and server.conf in sample-config-files for sample configurations which use the new directives. * On Windows, added --route-method to control whether IP Helper API or route.exe is used to add/delete routes. * On Windows, added a second parameter to --route-delay to control the maximum time period to wait for the TAP-Win32 adapter to come up before adding routes. * Fixed bug in Windows version where configurations which omit --ifconfig might fail to recognize when the TAP adapter is up. * Proxy connection failures will now retry according to the --connect-retry parameter. * Fixed --dev null handling on Windows so that TLS loopback test described in INSTALL file works correctly on Windows. * Added "Initialization Sequence Completed" message after all initialization steps have been completed and the VPN can be considered "up". * Better sanity-checking on --ifconfig-pool parameters. * Added --tcp-queue-limit option to control TUN/TAP -> TCP socket overflow. * --ifconfig-nowarn flag will now silence general warnings about possible --ifconfig address conflicts, including the warning about --ifconfig and --remote addresses being in same /24 subnet. * Fixed case where server mode did not correctly identify certain types of ethernet multicast packets (Marcel de Kogel). * Added --explicit-exit-notify option (experimental). 2004.08.02 -- Version 2.0-beta10 * Fixed possible reference after free of option strings after a restart, bug was introduced in beta8. * Fixed segfault at route.c:919 in the beta9 Windows version that was being caused by indirection through a NULL pointer. * Mistakenly built debug version of TAP-Win32 driver for beta9. Beta10 has correct release build. 2004.07.30 -- Version 2.0-beta9 * Fixed --route issue on Windows that was introduced with the new beta8 route implementation based on the IP Helper API. 2004.07.27 -- Version 2.0-beta8 * Added TCP support in server mode. * Added PKCS #12 support (Mathias Sundman). * Added patch to make revoke-crt and make-crl work seamlessly within the easy-rsa environment (Jan Kiszka). * Modified --mode server ethernet bridge code to forward special IEEE 802.1d MAC Groups, i.e. 01:80:C2:XX:XX:XX. * Added --dhcp-renew and --dhcp-release flags to Windows version. Normally DHCP renewal and release on the TAP adapter occurs automatically under Windows, however if you set the TAP-Win32 adapter Media Status property to "Always Connected", you may need these flags. * Added --show-net standalone flag to Windows version to show OpenVPN's view of the system adapter and routing tables. * Added --show-net-up flag to Windows version to output the system routing table and network adapter list to the log file after the TAP-Win32 adapter has been brought up and any routes have been added. * Modified Windows version to add routes using the IP Helper API rather than by calling route.exe. * Fixed bug where --route-up script was not being called if no --route options were specified. * Added --mute-replay-warnings to suppress packet replay warnings. This is a common false alarm on WiFi nets. * Added "def1" flag to --redirect-gateway option to override the default gateway by using 0.0.0.0/1 and 128.0.0.0/1 rather than 0.0.0.0/0. This has the benefit of overriding but not wiping out the original default gateway. (Thanks to Jim Carter for pointing out this idea). * You can now run OpenVPN with a single config file argument. For example, you can now say "openvpn config.conf" rather than "openvpn --config config.conf". * On Windows, made --route and --route-delay more adaptive with respect to waiting for interfaces referenced by the route destination to come up. Routes added by --route should now be added as soon as the interface comes up, rather than after an obligatory 10 second delay. The way this works internally is that --route-delay now defaults to 0 on Windows. Previous versions would wait for --route-delay seconds then add the routes. This version will wait --route-delay seconds and then test the routing table at one second intervals for the next 30 seconds and will not add the routes until they can be added without errors. * On Windows, don't setsockopt SO_SNDBUF or SO_RCVBUF by default on TCP/UDP socket in light of reports that this action can have undesirable global side effects on the MTU settings of other adapters. These parameters can still be set, but you need to explicitly specify --sndbuf and/or --rcvbuf. * Added --max-clients option to limit the maximum number of simultaneously connected clients in server mode. * Added error message to illuminate shell escape gotcha when single backslashes are used in Windows path names. * Added optional netmask parm to --ifconfig-pool. * Fixed bug where http-proxy connect retry attempts were incorrectly going to the remote OpenVPN server, not to the HTTP proxy server. 2004.06.29 -- Version 2.0-beta7 * Fixed bug in link_socket_verify_incoming_addr() which under certain circumstances could have caused --float behavior even if --float was not specified. * --tls-auth option now works with --mode server. All clients and the server should use the same --tls-auth key when operating in client/server mode. * Added --engine option to make use of OpenSSL-supported crypto acceleration hardware. * Fixed some high verbosity print format size issues in event.c for 64 bit platforms (Janne Johansson). * Made failure to open --log or --log-append file a non-fatal error. 2004.06.23 -- Version 2.0-beta6 * Fixed Windows installer to intelligently put up a reboot dialog only if tapinstall tells us that it's really necessary. * Fixed "Assertion failed at fragment.c:309" bug when --mode server and --fragment are used together. * Ignore HUP, USR1, and USR2 signals during initialization. Prior versions would abort. * Fixed bug on OS X: "Assertion failed at event.c:406". * Added --service option to Windows version, for use when OpenVPN is being programmatically instantiated by another process (see man page for info). * --log and --log-append options now work on Windows. * Update OpenBSD INSTALL notes (Janne Johansson). * Enable multicast on tun interface when running on OpenBSD (Pavlin Radoslavov). * Fixed recent --test-crypto breakage, where options such as --cipher were not being parsed correctly. * Modified options compatibility string by removing ifconfig substring if it is empty. Incremented options compatibility string version number to 4. * Fixed typo in --tls-timeout option parsing (Mikael Lonnroth). 2004.06.13 -- Version 2.0-beta5 * Fixed rare --mode server crash that could occur if data was being routed to a client at high bandwidth at the precise moment that the client instance object on the server was being deleted. * Fixed issue on machines which have epoll.h and the epoll_create glibc call defined, but which don't actually implement epoll in the kernel. OpenVPN will now gracefully fall back to the poll API in this case. * Fixed Windows bug which would cause the following error in a --mode server --dev tap configuration: "resource limit WSA_MAXIMUM_WAIT_EVENTS has been exceeded". * Added CRL (certificate revocation list) management scripts to easy-rsa directory (Jon Bendtsen). * Do a better job of getting the ifconfig component of the options consistency check to work correctly when --up-delay is used. * De-inlined some functions which were too complex to be inlined anyway with gcc. * If a --dhcp-option option is pushed to a non-windows client, the option will be saved in the client's environment before the --up script is called, under the name "foreign_option_{n}". * Added --learn-address script (see man page) which allows for firewall access through the VPN to be controlled based on the client common name. * In mode --server mode, when a client connects to the server, the server will disconnect any still-active clients which use the same common name. Use --duplicate-cn flag to revert to previous behavior of allowing multiple clients to concurrently connect with the same common name. 2004.06.08 -- Version 2.0-beta4 * Fixed issue with beta3 where Win32 service wrapper was keying off of old TAP HWID as a dependency. To ensure that the new service wrapper is correctly installed, the Windows install script will uninstall the old wrapper before installing the new one, causing a reset of service properties. * Fixed permissions issue on --status output file, with default access permissions of owner read/write only (default permissions can be changed of course with chmod). 2004.06.05 -- Version 2.0-beta3 * More changes to TAP-Win32 driver's INF file which affects the placement of the driver in the Windows device namespace. This is done to work around an apparent bug in Windows when short HWIDs are used, and will also ease the upgrade from 1.x to 2.0 by reducing the chances that a reboot will be needed on upgrade. Like beta2, this upgrade will delete existing TAP-Win32 interfaces, and reinstall a single new interface with default properties. * Major rewrite of I/O event wait layer in the style of libevent. This is a precursor to TCP support in --mode server. * New feature: --status. Outputs a SIGUSR2-like status summary to a given file, updated once per n seconds. The status file is comma delimited for easy machine parsing. * --ifconfig-pool now remembers common names and will try to assign a consistent IP to a given common name. Still to do: persist --ifconfig-pool memory across restarts by saving state in file. * Fixed bug in event timer queue which could cause recurring timer events such as --ping to not correctly schedule again after firing. This in turn would cause spurrious ping restarts and possible connection outages. Thanks to Denis Vlasenko for tracking this down. * Possible fix to reported bug where --daemon argument was not printing to syslog correctly after restart. * Fixed bug where pulling --route or --dhcp-option directives from a server would problematically interact with --persist-tun on the client. * Updated contrib/multilevel-init.patch (Farkas Levente). * Added RPM build option to .spec and .spec.in files to optionally disable LZO inclusion (Ian Pilcher). * The latest MingW runtime and headers define 'ssize_t', so a patch is needed (Gisle Vanem). 2004.05.14 -- Version 2.0-beta2 * Fixed signal handling bug in --mode server, where SIGHUP and SIGUSR1 were treated as SIGTERM. * Changed the TAP-Win32 HWID from "TAP" to "TAPDEV". Apparently the larger string may work around a problem where the TAP adapter is sometimes missing from the network connections panel, especially under XP SP2. Also note that installing this upgrade will uninstall any pre-existing TAP-Win32 adapters, and then install a single new adapter, meaning that old adapter properties will be lost. Thanks to Md5Chap for solving this one. * For --mode server --dev tap, the options --ifconfig and --ifconfig-pool are now optional. This allows address assignment via DHCP or use of a TAP VPN without IP support, as has always been possible with 1.x. * Fixed bug where --ifconfig may not work correctly on Linux 2.2. * Added 'local' flag to --redirect-gateway for use on networks where both OpenVPN daemons are connected to a shared subnet, such as wireless. 2004.05.09 -- Version 2.0-beta1 * Unchanged from test29 except for version number upgrade. 2004.05.08 -- Version 2.0-test29 * Modified --dev-node on Windows to accept a TAP-Win32 GUID name. In addition, --show-adapters will now display the high-level name and GUID of each adapter. This is an attempt to work around an issue in Windows where sometimes the TAP-Win32 adapter installs correctly but has no icon in the network connections control panel. In such cases, being able to specify --dev-node {TAP-GUID} can work around the missing icon. 2004.05.07 -- Version 2.0-test28 * Fixed bug which could cause segfault on program shutdown if --route and --persist-tun are used together. 2004.05.06 -- Version 2.0-test27 * Fixed bug in close_instance() which might cause memory to be accessed after it had already been freed. * Fixed bug in verify_callback() that might have caused uninitialized data to be referenced. * --iroute now allows full CIDR subnet routing. * In "--mode server --dev tun" usage, source addresses on VPN packets coming from a particular client must be associated with that client in the OpenVPN internal routing table. 2004.04.28 -- Version 2.0-test26 * Optimized broadcast path in multi-client mode. * Added socket buffer size options --rcvbuf & --sndbuf. * Configure Linux tun/tap driver to use a more sensible txqueuelen default. Also allow explicit setting via --txqueuelen option (Harald Roelle). * The --remote option now allows the port number to be specified as the second parameter. If unspecified, the port number defaults to the --rport value. * Multiple --remote options on the client can now be specified for load balancing and failover. The --remote-random flag can be used to initially randomize the --remote list for basic load balancing. * If a remote DNS name resolves to multiple DNS addresses, one will be chosen by random as a kind of basic load-balancing feature if --remote-random is used. * Added --connect-freq option to control maximum new connection frequency in multi-client mode. * In multi-client mode, all syslog messages associated with a specific client now include a client-ID prefix. * For Windows, use a gettimeofday() function based on QueryPerformanceCounter (Derek Burdick). * Fixed bug in interaction between --key-method 2 and DES ciphers, where dynamic keys would be generated with bad parity and then be rejected. 2004.04.17 -- Version 2.0-test24 * Reworked multi-client broadcast handling. 2004.04.13 -- Version 2.0-test23 * Fixed bug in --dev tun --client-to-client routing. * Fixed a potential deadlock in --pull. * Fixed a problem with select() usage which could cause a repeating sequence of "select : Invalid argument (code=22)" 2004.04.11 -- Version 2.0-test22 * Fixed bug where --mode server + --daemon was prematurely closing syslog connection. * Added support for --redirect-gateway on Mac OS X (Jeremy Apple). * Minor changes to TAP-Win32 driver based on feedback from the NDISTest tool. 2004.04.11 -- Version 2.0-test21 * Optimizations in multi-client server event loop. 2004.04.10 -- Version 2.0-test20 * --mode server capability now works with either tun or tap interfaces. When used with tap interfaces, OpenVPN will internally bridge all client tap interfaces with the server tap interface. * Connecting clients can now have a client-specific configuration on the server, based on the client common name embedded in the client certificate. See --client-config-dir and --client-connect. These options can be used to configure client-specific routes. * Added an option --client-to-client that enables internal client-to-client routing or bridging. Otherwise, clients will only "see" the server, not other connected clients. * Fixed bug in route scheduling which would have caused --mode server to not work on Windows in test18 and test19 with the sample config file. * Man page is up to date with all new options. * OpenVPN 2.0 release notes on web site updated with tap-style tunnel examples. 2004.04.02 -- Version 2.0-test19 * Fixed bug where routes pushed from server were not working correctly on Windows clients. * Added Mac OS X route patch (Jeremy Apple). 2004.03.30 -- Version 2.0-test18 * Minor fixes + Windows self-install modified to use OpenSSL 0.9.7d. 2004.03.29 -- Version 2.0-test17 * Fixed some bugs related to instance timeout and deletion. * Extended --push/--pull option to support additional option classes. 2004.03.28 -- Version 2.0-test16 * Successful test of --mode udp-server, --push, --pull, and --ifconfig-pool with server on Linux 2.4 and clients on Linux and Windows. 2004.03.25 -- Version 2.0-test15 * Implemented hash-table lookup of client instances based either on remote UDP address/port or remote ifconfig endpoint. * Implemented a randomized binary tree based scheduler for scalably scheduling a large number of client instance events. Uses the treap data structure and node rotation algorithm to keep the tree balanced. * Initial implementation of ifconfig-pool. * Made --key-method 2 the default. 2004.03.20 -- Version 2.0-test14 * Implemented --push and --pull. 2004.03.20 -- Version 2.0-test13 * Reduced struct tls_multi and --single-session memory footprint. * Modified --single-session flag to be used in multi-client UDP server client instances. 2004.03.19 -- Version 2.0-test12 * Added the key multi-client UDP server options, --mode, --push, --pull, and --ifconfig-pool. * Revamped GC (garbage collection) code to not rely on any global data. * Modifications to thread.[ch] to allow a more flexible thread model. 2004.03.16 -- Version 2.0-test11 * Moved all timer code to interval.h, added new file interval.c. * Fixed missing include. 2004.03.16 -- Version 2.0-test10 * More TAP-Win32 fixes. * Initial debugging and testing of multi.[ch]. 2004.03.14 -- Version 2.0-test9 * Branch merge with 1.6-rc3 * More point-to-multipoint work in multi.[ch]. * Major TAP-Win32 driver restructuring to use NdisMRegisterDevice instead of IoCreateDevice/IoCreateSymbolicLink. * Changed TAP-Win32 symbolic links to use \DosDevices\Global\ pathname prefix. * In the majority of cases, TAP-Win32 should now be able to install and uninstall on Win2K without requiring a reboot. * TAP-Win32 MAC address can now be explicitly set in the adapter advanced properties page. 2004.03.04 -- Version 2.0-test8 * Branch merge with 1.6-rc2. 2004.03.03 -- Version 2.0-test7 * Branch merge with 1.6-rc1.2. 2004.03.02 -- Version 2.0-test6 * Branch merge with 1.6-rc1. 2004.03.02 -- Version 2.0-test5 * Move Socks5 UDP header append/remove to socks.c, and is called from forward.c. * Moved verify statics from ssl.c into struct tls_session. * Wrote multi.[ch] to handle top level of point-to-multipoint mode. * Wrote some code to allow a struct link_socket in a child context to be slaved to the parent context. * Broke up packet read and process functions in forward.c (from socket or tuntap) into separate functions for read and process, so that point-to-point and point-to-multipoint can share the same code. * Expand TLS control channel to allow the passing of configuration commands. * Wrote mroute.[ch] to handle internal packet routing for point-to-multipoint mode. 2004.02.22 -- Version 2.0-test3 * Initial work on UDP multi-client server. * Branch merge of 1.6-beta7 2004.02.14 -- Version 2.0-test2 * Refactorization of openvpn.c into openvpn.[ch] init.[ch] forward.[ch] forward-inline.h occ.[ch] occ-inline.h ping.[ch] ping-inline.h sig.[ch]. Created a master per-tunnel struct context in openvpn.h. * Branch merge of 1.6-beta6.2 2003.11.06 -- Version 2.0-test1 * Initial testbed for 2.0. 2004.05.09 -- Version 1.6.0 * Unchanged from 1.6-rc4 except for version number upgrade. 2004.04.01 -- Version 1.6-rc4 * Made minor customizations to devcon and renamed as tapinstall.exe for Windows version. * Fixed "storage size of `iv' isn't known" build problem on FreeBSD. * OpenSSL 0.9.7d bundled with Windows self-install. 2004.03.13 -- Version 1.6-rc3 * Minor Windows fixes for --ip-win32 dynamic, relating to the way the TAP-Win32 driver responds to a DHCP request from the Windows DHCP client. * The net_gateway environmental variable wasn't being set correctly for called scripts (Paul Zuber). * Added code to determine the default gateway on FreeBSD, allowing the --redirect-gateway option to work (Juan Rodriguez Hervella). 2004.03.04 -- Version 1.6-rc2 * Fixed bug in Windows version where the NetBIOS node-type DHCP option might have been passed even if it was not specified. * Fixed bug in Windows version introduced in 1.6-rc1, where DHCP timeout would be set to 0 seconds if --ifconfig option was used and --ip-win32 option was not explicitly specified. * Added some new --dhcp-option types for Windows version. 2004.03.02 -- Version 1.6-rc1 * For Windows, make "--ip-win32 dynamic" the default. * For Windows, make "--route-delay 10" the default unless --ip-win32 dynamic is not used or --route-delay is explicitly specified. * L_TLS mutex could have been left in a locked state for certain kinds of TLS errors. 2004.02.22 -- Version 1.6-beta7 * Allow scheduling priority increase (--nice) together with UID/GID downgrade (--user/--group). * Code that causes SIGUSR1 restart on TLS errors in TCP mode was not activated in pthread builds. * Save the certificate serial number in an environmental variable called tls_serial_{n} prior to calling the --tls-verify script. n is the current cert chain level. * Added NetBSD IPv6 tunnel capability (also requires a kernel patch) (Horst Laschinsky). * Fixed bug in checking the return value of the nice() function (Ian Pilcher). * Bug fix in new FreeBSD IPv6 over TUN code which was originally added in 1.6-beta5 (Nathanael Rensen). * More Socks5 fixes -- extended the struct frame infrastructure to accomodate proxy-based encapsulation overhead. * Added --dhcp-option to Windows version for setting adapter properties such as WINS & DNS servers. * Use a default route-delay of 5 seconds when --ip-win32 dynamic is specified (only applicable when --route-delay is not explicitly specified). * Added "log_append" registry variable to control whether the OpenVPN service wrapper on Windows opens log files in append (log_append="1") or truncate (log_append="0") mode. The default is truncate. 2004.02.05 -- Version 1.6-beta6 * UDP over Socks5 fix to accomodate Socks5 encapsulation overhead (Christof Meerwald). * Minor --ip-win32 dynamic tweaks (use long lease time, invalidate existing lease with DHCPNAK). 2004.02.01 -- Version 1.6-beta5 * Added Socks5 proxy support (Christof Meerwald). * IPv6 tun support for FreeBSD (Thomas Glanzmann). * Special TAP-Win32 debug mode for Windows self-install that was enabled in beta4 is now turned off. * Added some new Solaris notes to INSTALL (Koen Maris). * More work on --ip-win32 dynamic. 2004.01.27 -- Version 1.6-beta4 * For this beta, the Windows self-install is a debug version and will run slower -- use only for testing. * Reverted the --ip-win32 default back to 'ipapi' from 'dynamic'. * Added the offset parameter to '--ip-win32 dynamic' which can be used to control the address of the masqueraded DHCP server which replies to Windows DHCP requests. * Added a wait/nowait option to --inetd (nowait can only be used with TCP sockets, TLS authentication, and over a bridged configuration -- see FAQ for more info) (Stefan `Sec` Zehl). * Added a build-time capability where TAP-Win32 driver debug messages can be output by OpenVPN at --verb 6 or higher. 2004.01.20 -- Version 1.6-beta2 * Added ./configure --enable-iproute2 flag which uses iproute2 instead of route + ifconfig -- this is necessary for the LEAF Linux distro (Martin Hejl). * Added renewal-time and rebind-time to set of DHCP options returned by the TAP-Win32 driver when "--ip-win32 dynamic" is used. 2004.01.14 -- Version 1.6-beta1 * Fixed --proxy bug that sometimes caused plaintext control info generated by the proxy prior to http CONNECT method establishment to be incorrectly parsed as OpenVPN data. * For Windows version, implemented the "--ip-win32 dynamic" method and made it the default. This method sets the TAP-Win32 adapter IP address and netmask by replying to the kernel's DHCP queries. See the man page for more detailed info. * Added --connect-retry parameter which controls the time interval (in seconds) between connect() retries when --proto tcp-client is used. Previously, this value was hardcoded to 5 seconds, and still defaults as such. * --resolv-retry can now be used with a parameter of "infinite" to retry indefinitely. * Added SSL_CTX_use_certificate_chain_file() to ssl.c for support of multi-level certificate chains (Sten Kalenda). * Fixed --tls-auth incompatibility with 1.4.x and earlier versions of OpenVPN when the passphrase file is an OpenVPN static key file (as generated by --genkey). * Added shell-escape support in config files using the backslash character ("\") so that (for example) double quotes can be passed to the shell. * Added "contrib" subdirectory on tarball, source zip, and CVS containing user-submitted contributions. * Added an optional patch to the Redhat init script to allow the configuration file directory to be a multi-level directory hierarchy (Farkas Levente). See contrib/multilevel-init.patch * Added some scripts and documentation on using Linux "fwmark" iptables rules to enable fine-grained routing control over the VPN (Sean Reifschneider, ). See contrib/openvpn-fwmarkroute-1.00 2003.11.20 -- Version 1.5.0 * Minor documentation changes. 2003.11.04 -- Version 1.5-beta14 * Fixed build problem with ./configure --disable-ssl that was reported on Debian woody. * Fixed bug where --redirect-gateway could not be used together with --resolv-retry. 2003.11.03 -- Version 1.5-beta13 * Added CRL (certificate revocation list) capability using --crl-verify option (Stefano Bracalenti). * Added --replay-window option for variable replay-protection window sizes. * Fixed --fragment bug which might have caused certain large packets to be sent unfragmented. * Modified --secret and --tls-auth to permit different cipher and HMAC keys to be used for each data flow direction. Also increased static key file size generated by --genkey from 1024 to 2048 bits, where 512 bits each are reserved for send-HMAC, encrypt, receive-HMAC, and decrypt. Key file forward and backward compatibility is maintained. See --secret option documentation on the man page for more info. * Added --tls-remote option (Teemu Kiviniemi). * Fixed --tls-cipher documention regarding correct delimiter usage (Teemu Kiviniemi). * Added --key-method option for selecting alternative data channel key negotiation methods. Method 1 is the default. Method 2 has been added (see man page for more info). * Added French translation of HOWTO to web site (Guillaume Lehmann). * Fixed problem caused by late resolver library load on certain platforms when --resolv-retry and --chroot are used together (Teemu Kiviniemi). * In TCP mode, all decryption or TLS errors will abort the current connection (this is not done in UDP mode because UDP is "connectionless"). * Fixed a TCP client reconnect bug that only occurs on the BSDs, where connect() fails with an invalid argument. This bug was partially (but not completely) fixed in beta7. * Added "route_net_gateway" environmental variable which contains the pre-existing default gateway address from the routing table (there's no standard API for getting the default gateway, so right now this feature only works on Windows or Linux). * Renamed the "route_default_gateway" enviromental variable to "route_vpn_gateway" -- this is the remote VPN endpoint. * The special keywords vpn_gateway, net_gateway, and remote_host can now be used for the network or gateway components of the --route option. See the man page for more info. * Added the --redirect-gateway option to configure the VPN as the default gateway (implemented on Linux and Windows only). * Added the --http-proxy option with basic authentication support for use in TCP client mode. Successfully tested using Squid as the HTTP proxy, with and without authentication. 2003.10.12 -- Version 1.5-beta12 * Fixed Linux-only bug in --mktun and --rmtun which was introduced around beta8 or so, which would cause an error such as "I don't recognize device tun0 as a tun or tap device1". * Added --ifconfig-nowarn option to disable options consistency warnings about --ifconfig parameters. * Don't allow any kind of sequence number backtracking or message reordering when in TCP mode. * Changed beta naming convention to use '_' (underscore) rather than '-' (dash) to pacify rpmbuild. 2003.10.08 -- Version 1.5-beta11 * Modified code in the Windows version which sets the IP address and netmask of the TAP-Win32 adapter using the IP Helper API. Most of the changes involve better error recovery when the IP Helper API returns an error status. See the manual page entry on --ip-win32 for more info. 2003.10.08 -- Version 1.5-beta10 * Added getpass() function for Windows version so that --askpass option works correctly (Stefano Bracalenti). * Added reboot advisory to end of Win32 install script. * Changed crypto code to use pseudo-random IVs rather than carrying forward the IV state from the previous packet. This is in response to item 2 in the following document: http://www.openssl.org/~bodo/tls-cbc.txt which points out weaknesses in TLS's use of the same IV carryforward approach. This change does not break protocol compatibility with previous versions of OpenVPN. * Made a change to the crypto replay protection code to also protect against certain kinds of packet reordering attacks. This change does not break protocol compatibility with previous versions of OpenVPN. * Added --ip-win32 option to provide several choices for setting the IP address on the TAP-Win32 adapter. * #ifdefed out non-CBC crypto modes by default. * Added --up-delay option to delay TUN/TAP open and --up script execution until after connection establishment. This option replaces the earlier windows-only option --tap-delay. 2003.10.01 -- Version 1.5-beta9 * Fixed --route-noexec bug where option was not parsed correctly. * Complain if --dev tun is specified without --ifconfig on Windows. * Fixed bug where TCP connections on windows would sometimes cause an assertion failure. * Added a new flag to TAP-Win32 advanced properties that allows one to set the adapter to be always "connected" even when an OpenVPN process doesn't have it open. The default behavior is to report a media status of connected only when an OpenVPN process has the adapter open. * Rebuilt the Windows self-install distribution with OpenSSL 0.9.7c DLLs in response to an OpenSSL security advisory. 2003.09.30 -- Version 1.5-beta8 * Extended the --ifconfig option to work on tap devices as well as tun devices. * Implemented the --ifconfig option for Windows, by calling the netsh tool. * By default, do an "arp -d *" on Windows after TAP-Win32 open to refresh the MAC cache. This behaviour can be disabled with --no-arp-del. * On Windows, allow the --dev-node parameter (which specifies the name of the TAP-Win32 adapter) to be omitted in cases where there is a single TAP-Win32 adapter on the system which can be assumed to be the default. * Modified the diagnostic --verb 5 debugging level to print 'R' for TCP/UDP read, 'W' for TCP/UDP write, 'r' for TUN/TAP read, and 'w' for TUN/TAP write. * Conditionalize OpenBSD read_tun and write_tun based on tun or tap mode. * Added IPv6 tun support to OpenBSD (Thomas Glanzmann). * Make the --enable-mtu-dynamic ./configure option enabled by default. * Deprecated the --mtu-dynamic run-time option, in favor of --fragment. * DNS names can now be used as --ifconfig parameters. * Significant work on TAP-Win32 driver to bring up to SMP standards. * On Windows, fixed dangling IRP problem if TAP-Win32 driver is unloaded or disabled, while a user-space process has it open. * On Windows, if --tun-mtu is not specified, it will be read from the TAP-Win32 driver via ioctl. * On Windows, added TAP-Win32 driver status info to "F2" keyboard signal (only when run from a console window). * Added --mssfix option to control TCP MSS size (YANO Hirokuni). * Renamed --mtu-dynamic option to --fragment to more accurately reflect its function. Fragment accepts a single parameter which is the upper limit on acceptable UDP packet size. * Changed default --tun-mtu-extra parameter to 32 from 64. * Eliminated reference to malloc.o in configure.ac. * Added tun device emulation to the TAP-Win32 driver. * Added --route and related options. * Added init script for SuSE Linux (Frank Plohmann). * Extended option consistency check between peers to function in all crypto modes, including static-key and cleartext modes. Previously only TLS mode was supported. Disable with --disable-occ. * Overall, increased the amount of configuration option sanity checking, especially of networking parameters. * Added --mtu-test option for empirical MTU measurement. * Added Windows-only option --tap-delay to not set the TAP-Win32 adapter media state to 'connected' until TCP/UDP connection establishment with peer. * Slightly modified --route/--route-delay semantics so that when --route is given without --route-delay, routes are added immediately after tun/tap device open. When --route-delay is specified, routes will be added n seconds after connection initiation, where n is the --route-delay parameter (which can be set to 0). * Made TCP framing error into a non-fatal error that triggers a connection reset. 2003.08.28 -- Version 1.5-beta7 * Fixed bug that caused OpenVPN not to respond to exit/restart signals when --resolv-retry is used and a local or remote DNS name cannot be resolved. * Exported a series of environmental variables with useful info for scripts. See man page for more info. Based on a suggestion by Anthony Ciaravalo. * Moved TCP/UDP socket bind to a point in the initialization before the --up script gets called. This is desirable because (a) a socket bind failure will happen before daemonization, allowing an error status code to be returned to the shell and (b) the possibility is eliminated of a socket bind failure causing the --up script to be run but not the --down script. This change has a side effect that --resolv-retry will no longer work with --local. * Fixed bug where if an OpenVPN TCP server went down and back up again, Solaris or FreeBSD clients would fail to reconnect to it. * Fixed bug that prevented OpenVPN from being run by inetd/xinetd in TCP mode. * Added --log and --log-append options for logging messages to a file. * On Windows, check that the current user is a member of the Administrator group before attempting install or uninstall. 2003.08.16 -- Version 1.5-beta6 * Fixed TAP-Win32 driver to properly increment the Rx/Tx count. 2003.08.14 -- Version 1.5-beta5 * Added user-configurability of the TAP-Win32 adapter MTU through the adapter advanced properties page. * Added Windows Service support. * On Windows, added file association and right-clickability for .ovpn files (OpenVPN config files). 2003.08.05 -- Version 1.5-beta4 * Extra refinements and error checking added to Windows NSIS install script. 2003.08.05 -- Version 1.5-beta3 * Added md5.h include to crypto.c to fix build problem on OpenBSD. * Created a Win32 installer using NSIS. * Removed DelService command from TAP-Win32 INF file. It appears to be not necessary and it interfered with the ability to uninstall and reinstall the driver without needing to reboot. * On Windows version, added "addtap" and "deltapall" batch files to add and delete TAP-Win32 adapter instances. 2003.07.31 -- Version 1.5-beta2 * Renamed INSTALL.w32 to INSTALL-win32.txt and reformatted in Windows ASCII so it's easier to click and view. * Added postscript and PDF versions of the HOWTO to the web site (C R Zamana). * Merged Michael Clarke's stability patch into TAP-Win32 driver which appears to fix the suspend/resume driver bug and significantly improve driver stability. * Added Christof Meerwald's Media Status patch to the TAP-Win32 driver which shows the TAP adapter to be disconnected when OpenVPN is not running. * Moved socket connect and TCP server listen code to a later point in openvpn() function so that the TCP server listen state is entered after daemonization. * Added keyboard shortcuts to simulate signals in the Windows version, see the window title bar for descriptions. 2003.07.24 -- Version 1.5-beta1 * Added TCP support via the new --proto option. * Renamed udp-centric options such as --udp-mtu to --link-mtu (old option names preserved for compatibility). * Ported to Windows 2000 + XP using mingw and a TAP driver derived from the Cipe-Win32 project by Damion K. Wilson. * Added --show-adapters flag for windows version. * Reworked the SSL/TLS packet acknowledge code to better handle certain corner cases. * Turned off the default enabling of IP forwarding in the sample-scripts/openvpn.init script for Redhat. Forwarding can be enabled by users in their --up scripts or firewall config. * Added --up-restart option based on suggestion from Sean Reifschneider. * If --dev tap or --dev-type tap is specified, --tun-mtu defaults to 1500 and --tun-mtu-extra defaults to 64. * Enabled --verb 5 debugging mode that prints 'R' and 'W' for each packet read or write on the TCP/UDP socket. 2003.08.04 -- Version 1.4.3 * Added md5.h include to crypto.c to fix build problem on OpenBSD. 2003.07.15 -- Version 1.4.2 * Removed adaptive bandwidth from --mtu-dynamic -- its absence appears to work better than its existence (1.4.1.2). * Minor changes to --shaper to fix long retransmit timeouts at low bandwidth (1.4.1.2). * Added LOG_RW flag to openvpn.h for debugging (1.4.1.2). * Silenced spurious configure warnings (1.4.1.2). * Backed out --dev-name patch, modified --dev to offer equivalent functionality (1.4.1.4). * Added an optional parameter to --daemon and --inetd to support the passing of a custom program name to the system logger (1.4.1.5). * Add compiled-in options to the program title (1.4.1.5). * Coded the beginnings of a WIN32 port (1.4.1.5). * Succeeded in porting to Win32 Mingw environment and running loopback tests (1.4.1.6). Still need a kernel driver for full Win32 functionality. * Fixed a bug in error.h where HAVE_CPP_VARARG_MACRO_GCC was misspelled. This would have caused a significant slowdown of OpenVPN when built by compilers that lack ISO C99 vararg macros (1.4.1.6). * Created an init script for Gentoo Linux in ./gentoo directory (1.4.1.6). 2003.05.15 -- Version 1.4.1 * Modified the Linux 2.4 TUN/TAP open code to fall back to the 2.2 TUN/TAP interface if the open or ioctl fails. * Fixed bug when --verb is set to 0 and non-fatal socket errors occur, causing 100% CPU utilization. Occurs on platorms where EXTENDED_SOCKET_ERROR_CAPABILITY is defined, such as Linux 2.4. * Fixed typo in tun.c that was preventing OpenBSD build. * Added --enable-mtu-dynamic configure option to enable --mtu-dynamic experimental option. 2003.05.07 -- Version 1.4.0 * Added --replay-persist feature to allow replay protection across sessions. * Fixed bug where --ifconfig could not be used with --tun-mtu. * Added --tun-mtu-extra parameter to deal with the situation where a read on a TUN/TAP device returns more data than the device's MTU size. * Fixed bug where some IPv6 support code for Linux was not being properly ifdefed out for Linux 2.2, causing compile errors. * Added OPENVPN_EXIT_STATUS_x codes to openvpn.h to control which status value openvpn returns to its caller (such as a shell or inetd/xinetd) for various conditions. * Added OPENVPN_DEBUG_COMMAND_LINE flag to openvpn.h to allow debugging in situations where stdout, stderr, and syslog cannot be used for message output, such as when OpenVPN is instantiated by inetd/xinetd. * Removed owner-execute permission from file created by static key generator (Herbert Xu and Alberto Gonzalez Iniesta). * Added --passtos option to allow IPv4 TOS bits to be passed from TUN/TAP input packets to the outgoing UDP socket (Craig Knox). * Added code to prevent open socket file descriptors from being accessible to called scripts. * Added --dev-name option (Christian Lademann). * Added --mtu-disc option for manual control over MTU options. * Show OS MTU value on UDP socket write failures (linux only). * Numerous build system and portability fixes (Matthias Andree). * Added better sensing of compiler support for variable argument macros, including (a) gcc style, (b) ISO C 1999 style, and (c) no support. * Removed generated files from CVS. Note INSTALL file for new CVS build commands. * Changed certain internal symbol names for C standards compliance. * Added TUN/TAP open code to cycle dynamically through unit numbers until it finds a free unit (based on code from Thomas Gielfeldt and VTun). * Added dynamic MTU and fragmenting infrastructure (Experimental). Rebuild with FRAGMENT_ENABLE defined to enable. * Minor changes to SSL/TLS negotiation, use exponential backoff on retransmits, and use a smaller MTU size (note that no protocol changes have been made which would break compatibility with 1.3.x). * Added --enable-strict-options flag to ./configure. This option will cause a more strict check for options compatibility between peers when SSL/TLS negotiation is used, but should only be used when both OpenVPN peers are of the same version. * Reorganization of debugging levels. * Added a workaround in configure.ac for default SSL header location on Linux to fix RH9 build problem. * Fixed potential deadlock when pthread support is used on OSes that allocate a small socketpair() message buffer. * Fixed openvpn.init to be sh compliant (Bishop Clark). * Changed --daemon to wait until all initialization is finished before becoming a daemon, for the benefit of initialization scripts that want a useful return status from the openvpn command. * Made openvpn.init script more robust, including positive indication of initialization errors in the openvpn daemon and better sanity checks. * Changed --chroot to wait until initialization is finished before calling chroot(), and allow the use of --user and --group with --chroot. * When syslog logging is enabled (--daemon or --inetd), set stdin/stdout/stderr to point to /dev/null. * For inetd instantiations, dup socket descriptor to a >2 value. * Fixed bug in verify-cn script, where test would incorrectly fail if CN=x was the last component of the X509 composite string (Anonymous). * Added Markus F.X.J. Oberhumer's special license exception to COPYING. 2002.10.23 -- Version 1.3.2 * Added SSL_CTX_set_client_CA_list call to follow the canonical form for TLS initialization recommended by the OpenSSL docs. This change allows better support for intermediate CAs and has no impact on security. * Added build-inter script to easy-rsa package, to facilitate the generation of intermediate CAs. * Ported to NetBSD (Dimitri Goldin). * Fixed minor bug in easy-rsa/sign-req. It refers to openssl.cnf file, instead of $KEY_CONFIG, like all other scripts (Ernesto Baschny). * Added --days 3650 to the root CA generation command in the HOWTO to override the woefully small 30 day default (Dominik 'Aeneas' Schnitzer). * Fixed bug where --ping-restart would sometimes not re-resolve remote DNS hostname. * Added --tun-ipv6 option and related infrastructure support for IPv6 over tun. * Added IPv6 over tun support for Linux (Aaron Sethman). * Added FreeBSD 4.1.1+ TUN/TAP driver notes to INSTALL (Matthias Andree). * Added inetd/xinetd support (--inetd) including documentation in the HOWTO. * Added "Important Note on the use of commercial certificate authorities (CAs) with OpenVPN" to HOWTO based on issues raised on the openvpn-users list. 2002.07.10 -- Version 1.3.1 * Fixed bug in openvpn.spec and openvpn.init which caused RPM upgrade to fail. 2002.07.10 -- Version 1.3.0 * Added --dev-node option to allow explicit selection of tun/tap device node. * Removed mlockall call from child thread, as it doesn't appear to be necessary (child thread inherits mlockall state from parent). * Added --ping-timer-rem which causes timer for --ping-exit and --ping-restart not to run unless we have a remote IP address. * Added condrestart to openvpn.init and openvpn.spec (Bishop Clark). * Added --ifconfig case for FreeBSD (Matthias Andree). * Call openlog with facility=LOG_DAEMON (Matthias Andree). * Changed LOG_INFO messages to LOG_NOTICE. * Added warning when key files are group/others accessible. * Added --single-session flag for TLS mode. * Fixed bug where --writepid would segfault if used with an invalid filename. * Fixed bug where --ipchange status message was formatted incorrectly. * Print more concise error message when system() call fails. * Added --disable-occ option. * Added --local, --remote, and --ifconfig options sanity check. * Changed default UDP MTU to 1300 and TUN/TAP MTU to 1300. * Successfully tested with OpenSSL 0.9.7 Beta 2. * Broke out debug level definitions to errlevel.h * Minor documentation and web site changes. * All changes maintain protocol compatibility with OpenVPN versions since 1.1.0, however default MTU changes will require setting the MTU explicitly by command line option, if you want 1.3.0 to communicate with previous versions. 2002.06.12 -- Version 1.2.1 * Added --ping-restart option to restart connection on ping timeout using SIGUSR1 logic (Matthias Andree). * Added --persist-tun, --persist-key, --persist-local-ip, and --persist-remote-ip options for finer-grained control over SIGUSR1 and --ping-restart restarts. To replicate previous SIGUSR1 functionality, use --persist-remote-ip. * Changed residual IV fetching code to take IV from tail of ciphertext. * Added check to make sure that CFB or OFB cipher modes are only used with SSL/TLS authentication mode, and added a caveat to INSTALL. * Changed signal handling during initialization (including re-initialization during restarts) to exit on SIGTERM or SIGINT and ignore other signals which would ordinarily be caught. * Added --resolv-retry option to allow retries on hostname resolution. * Expanded the --float option to also allow dynamic changes in source port number on incoming datagrams. * Added --mute option to limit repetitive logging of similar message types. * Added --group option to downgrade GID after initialization. * Try to set ifconfig path automatically in configure. * Added --ifconfig code for Mac OS X (Christoph Pfisterer). * Moved "Peer Connection Initiated" message to --verb level 1. * Successfully tested with OpenSSL 0.9.7 Beta 1 and AES cipher. * Added RPM notes to INSTALL. * Added ACX_PTHREAD (from the autoconf macro archive) to configure.ac to figure out the right pthread options for a given platform. * Broke out macro definitions from configure.ac to acinclude.m4. * Minor changes to docs and HOWTO. * All changes maintain protocol compatibility with OpenVPN versions since 1.1.0. 2002.05.22 -- Version 1.2.0 * Added configuration file support via the --config option. * Added pthread support to improve latency. With pthread support, OpenVPN will offload CPU-intensive tasks such as RSA key number crunching to a background thread to improve tunnel packet forwarding latency. pthread support can be enabled with the --enable-pthread configure option. Pthread support is currently available only for Linux and Solaris. * Added --dev-type option so that tun/tap device names don't need to begin with "tun" or "tap". * Added --writepid option to write main process ID to a file. * Numerous portability fixes to ease porting to other OSes including changing all network types to uint8_t and uint32_t, and not assuming that time_t is 32 bits. * Backported to OpenSSL 0.9.5. * Ported to Solaris. * Finished OpenBSD port except for pthread support. * Added initialization script: sample-scripts/openvpn.init (Douglas Keller) * Ported to Mac OS X (Christoph Pfisterer). * Improved resilience to DoS attacks when TLS mode is used without --remote or --tls-auth, or when --float is used with --remote. Note however that the best defense against DoS attacks in TLS mode is to use --tls-auth. * Eliminated automake/autoconf dependency for non-developers. * Ported configure.in to configure.ac and autoconf 2.50+. * SIGHUP signal now causes OpenVPN to restart and re-read command line and or config file, in conformance with canonical daemon behaviour. * SIGUSR1 now does what SIGHUP did in version 1.1.1 and earlier -- close and reopen the UDP socket for use when DHCP changes host's IP address and preserve most recently authenticated peer address without rereading config file. * SIGUSR2 added -- outputs current statistics, including compression statistics. * All changes maintain protocol compatibility with 1.1.1 and 1.1.0. 2002.04.22 -- Version 1.1.1 * Added --ifconfig option to automatically configure TUN device. * Added inactivity disconnect (--inactive and --ping-exit options). * Added --ping option to keep stateful firewalls from timing out. * Added sanity check to command line parser to err if any TLS options are used in non-TLS mode. * Fixed build problem with compiler environments that define printf as a macro. * Fixed build problem on linux systems that have an integrated TUN/TAP driver but lack the persistent tunnel feature (TUNSETPERSIST). Some linux kernels >= 2.4.0 and < 2.4.7 fall into this category. * Changed all calls to EVP_CipherInit to use explicit encrypt/decrypt mode in order to fix problem with IDEA-CBC and AES-256-CBC ciphers. * Minor changes to control channel transmit limiter algorithm to fix problem where TLS control channel might not renegotiate within the default 60 second window. * Simplified man page examples by taking advantage of the new --ifconfig option. * Minor changes to configure.in to check more rigourously for OpenSSL 0.9.6 or greater. * Put back openvpn.spec, eliminated openvpn.spec.in. * Modified openvpn.spec to reflect new automake-based build environment (Bishop Clark). * Other documentation changes. * Added --test-crypto option for debugging. * Added "missing" and "mkinstalldirs" automake support files. 2002.04.09 -- Version 1.1.0 * Strengthened replay protection and IV handling, extending it fully to both static key and TLS dynamic key exchange modes. * Added --mlock option to disable paging and ensure that key material and tunnel data is never paged to disk. * Added optional traffic shaping feature to cap the maximum data rate of the tunnel. * Converted to automake (The Platypus Brothers 2002-04-01). * Ported to OpenBSD by Janne Johansson. * Added --tun-af-inet option to work around an incompatibility between Linux and BSD tun drivers. * Sequence number-based replay protection using the IPSec sliding window model is now the default, disable with --no-replay. * Explicit IV is now the default, disable with --no-iv. * Disabled all cipher modes except CBC, CFB, and OFB. * In CBC mode, use explicit IV and carry forward residuals, using IPSec model. * In CFB/OFB mode, IV is timestamp, sequence number. * Eliminated --packet-id, --timestamp, and max-delta parameter to the --tls-auth option as they are now supplanted by improved replay code which is enabled by default. * Eliminated --rand-iv as it is now obsolete with improved IV code. * Eliminated --reneg-err option as it increases vulnerability to DoS attacks. * Added weak key check for DES ciphers. * --tls-freq option is no longer specified on the command line, instead it now inherits its parameter from the --tls-timeout option. * Fixed bug that would try to free memory on exit that was never malloced if --comp-lzo was not specified. * Errata fixed in the man page examples: "test-ca" should be "tmp-ca". * Updated manual page. * Preliminary work in porting to OpenSSL 0.9.7. * Changed license to allowing linking with OpenSSL. 2002.03.29 -- Version 1.0.3 * Fixed a problem in configure with library ordering on the command line. 2002.03.28 -- Version 1.0.2 * Improved the efficiency of the inner event loop. * Fixed a minor bug with timeout handling. * Improved the build system to build on RH 6.2 through 7.2. * Added an openvpn.spec file for RPM builders (Bishop Clark). 2002.03.23 -- Version 1.0 * Added TLS-based authentication and key exchange. * Added gremlin mode to stress test. * Wrote man page. 2001.12.26 -- Version 0.91 * Added any choice of cipher or HMAC digest. 2001.5.13 -- Version 0.90 * Initial release. * IP tunnel over UDP, with blowfish cipher and SHA1 HMAC signature.