No need to deprive tar ball users of this information.
Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20230619132934.76085-5-frank@lichtenheld.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg26749.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit 9ccb14970387d7c13589b85b0ca7048cebf52c6d)
OpenVPN currently has a bit of a weakness in its early three way handshake
A single client reset packet (first packet of the handshake) will
- trigger creating a session on the server side leading to potential
ressource exhaustion
- make the server respond with 3 answers trying to get an ACK for its
P_CONTROL_HARD_RESET_SERVER_V2 answer making it an amplification
Instead of allocating a connection for each client on the initial packet
OpenVPN will now calculate a session id based on a HMAC that serves as
verifiable cookie that can be checked for authenticity when the client
responds with it. This eliminates the amplification attack and resource
exhaustion attacks.
For tls-crypt-v2 clients the HMAC based handshake is not used yet (will
be added in one of the next patches).
Patch v2: rebase on master
patch v3: fix unit tests, improve comment/style of code
Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Frank Lichtenheld <frank@lichtenheld.com>
Message-Id: <20220502154310.836947-1-arne@rfc2549.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg24262.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
This also eliminates the confusing name and eliminates
tunnel_server_udp as wrapper that only calls
tunnel_server_udp_single_threaded
Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20210401131337.3684-4-arne@rfc2549.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg21955.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
OpenVPN currently uses its own (based on TLS 1.0) key derivation
mechanism to generate the 256 bytes key data in key2 struct that
are then used used to generate encryption/hmac/iv vectors. While
this mechanism is still secure, it is not state of the art.
Instead of modernising our own approach, this commit implements
key derivation using the Keying Material Exporters API introduced
by RFC 5705.
We also use an opportunistic approach of negotiating the use of
EKM (exported key material) through an IV_PROTO flag and prefer
EKM to our own PRF if both client and server support it. The
use of EKM is pushed to the client as part of NCP as
key-derivation tls-ekm.
We still exchange the random data (112 bytes from client to server
and 64 byte from server to client) for the OpenVPN PRF but
do not use it. Removing that exchange would break the handshake
and make a key-method 3 or similar necessary.
As a side effect, this makes a little bit easier to have a FIPS compatible
version of OpenVPN since we do not rely on calling MD5 anymore.
Side note: this commit breaks the (not yet merged) WolfSSL support as it
claims to support EKM in the OpenSSL compat API but always returns an error
if you try to use it.
Patch v2: rebase/change to V2 of EKM refactoring
Patch v3: add Changes.rst
Patch v4: Rebase on master.
Patch v5: Refuse internal label to be used with --keying-material-exporter,
polishing/fixes suggested by Steffan integrated
Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Steffan Karger <steffan.karger@foxcrypto.com>
Message-Id: <20201009115453.4279-1-arne@rfc2549.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg21187.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
Key-method 1 is only needed to talk to pre OpenVPN 2.0 clients.
Patch V2: Fix style. Make V1 op codes illegal, remove all code handling
v1 op codes and give a good warning message if we encounter
them in the legal op codes pre-check.
Patch V3: Add a bit more comments in the existing methods.
Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: David Sommerseth <davids@openvpn.net>
Message-Id: <20200721100128.9850-1-arne@rfc2549.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg20516.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
After some discussion among the core community developers [1,2], it was
decided to remove the possibility to build openvpn as a pure client.
This was alterted on the mailing list [3] that it was scheduled for
removal unless anyone had strong arguments why it was needed.
The general consensus was that we had not received any strong arguments
to keep this possibility after approximately 5 months, so it was fine to
remove this ./configure option.
By removing this, we remove quite some entangled sections of #ifdef
scattered all over the code base, making it more readable.
One note:
Inside the options_postprocess_mutate_invariant() function,
the #ifdef P2MP_SERVER and #ifdef _WIN32 blocks where slightly
reworked to make the _WIN32 block more continous and avoiding having an
empty if(options->mode == MODE_SERVER) block.
Signed-off-by: David Sommerseth <davids@openvpn.net>
[1]
https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg18830.h
tml
[2]
https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg19505.h
tml
[3]
https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg18829.h
tml
Acked-by: Arne Schwabe <arne@rfc2549.org>
Message-Id: <20200227205443.27562-1-davids@openvpn.net>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg19506.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
The autumn of 2017, OpenVPN Technologies, Inc changed name to just
OpenVPN Inc. Otherwise, extend the copyright to cover 2018 as well.
With the exception of the company name change, all changes have been
performed by the dev-tools/update-copyright.sh script.
Signed-off-by: David Sommerseth <davids@openvpn.net>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20180131140314.11103-1-davids@openvpn.net>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg16418.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
With this patch we remove the possibility to disable the crypto engine
(ENABLE_CRYPTO define) at configuration time.
[--disable-crypto has been removed from .travis.yml too]
Signed-off-by: Antonio Quartulli <a@unstable.cc>
Acked-by: Steffan Karger <steffan.karger@fox-it.com>
Message-Id: <20171203124952.15220-1-a@unstable.cc>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg15979.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
The crypto engine cannot be disabled anymore, therefore get
rid of all the related ifdefs in the code.
This change makes the code simpler and reduces our the
number of config combinations we have to test after a new
change is applied.
Signed-off-by: Antonio Quartulli <a@unstable.cc>
Acked-by: Steffan Karger <steffan.karger@fox-it.com>
Message-Id: <20171204010110.22091-1-a@unstable.cc>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg16004.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
Add a make target, such that 'make doxygen' works (both for in-tree and
out-of-tree builds). This now generates the doxygen in doc/doxygen/,
rather than in doxygen/.
While doing so, instead of genering docs with full path names (e.g.
/home/steffan/dev/openvpn/src/openvpn/crypto.h), use a relative path wrt
the project root (e.g. src/openvpn/crypto.h) in the generated
documentation. This makes the generated doxygen easier to read.
Signed-off-by: Steffan Karger <steffan.karger@fox-it.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1510143174-15248-1-git-send-email-steffan.karger@fox-it.com>
URL: https://www.mail-archive.com/search?l=mid&q=1510143174-15248-1-git-send-email-steffan.karger@fox-it.com
Signed-off-by: Gert Doering <gert@greenie.muc.de>
There were references in our documentation to the now deprecated PolarSSL
library, which have changed name upstream to mbed TLS.
In addition, where appropriate, the documentation now considers only
mbed TLS 2.0 and newer. This is in accordance with the requirements
./configure sets.
[DS: On-the-fly change - Updated Makefile.am to use README.mbedtls
instead of README.polarssl. This ensures make dist and buildbots
won't explode]
Signed-off-by: David Sommerseth <davids@openvpn.net>
Acked-by: Steffan Karger <steffan.karger@fox-it.com>
Message-Id: <20170822114715.14225-1-davids@openvpn.net>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg15309.html
Signed-off-by: David Sommerseth <davids@openvpn.net>
The COPYRIGHT.GPL file was slightly out-of-sync with the last GPLv2
license from Free Software Foundation, Inc.
The changes are primarily a new address, which required touching almost
all the project files.
Except of that, it is just minor adjustments to formatting, removal of
form-feed characters and referencing "GNU Lesser General Public License"
instead of "GNU Library General Public License".
Signed-off-by: David Sommerseth <davids@openvpn.net>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20170329093648.10156-1-davids@openvpn.net>
URL: https://www.mail-archive.com/search?l=mid&q=20170329093648.10156-1-davids@openvpn.net
Signed-off-by: Gert Doering <gert@greenie.muc.de>
With c99, "WIN32" is no longer automatically defined when (cross-)building
for Windows, and proper compilation relies on including <windefs.h>,
before checking the macro. "_WIN32" is the official define that is
guaranteed to be defined by the compiler itself, no includes are needed.
So, mechanically change all occurrances of "WIN32" to "_WIN32".
While at it, get rid of unused WIN32_0_1 #define in syshead.h
See also:
http://nadeausoftware.com/articles/2012/01/c_c_tip_how_use_compiler_predefi
ned_macros_detect_operating_system#WindowsCygwinnonPOSIXandMinGW
Trac #746
v2: rebased to master, merge the console[_builtin].c changes
Signed-off-by: Gert Doering <gert@greenie.muc.de>
Acked-by: Steffan Karger <steffan.karger@fox-it.com>
Message-Id: <20161113195228.74090-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg13035.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
Remove the --disable-ssl configure option and accompanying ENABLE_SSL
defines in the master/2.4 branch, to reduce the code and testing
complexity a bit.
This does not remove to runtime option to run without SSL, just the compile
time option to not include any SSL-related code.
During the community meeting in November 2014 there were no objections
amongst he developers present. Also, this has been announced on the -users
and -devel mailing lists two weeks ago, without any response whatsoever.
Signed-off-by: Steffan Karger <steffan@karger.me>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <54A4248A.1090501@karger.me>
URL: http://article.gmane.org/gmane.network.openvpn.devel/9371
Signed-off-by: Gert Doering <gert@greenie.muc.de>
This is not a full update, but just updates some data channel-related docs
I came across. Other pages probably need a bit of attention too.
Stuff that was changed:
* Explain data channel crypto format in crypto.h
* Add P_DATA_V1 and P_DATA_V2 packet format spec
* Remove '2.1' from title
* Update some OpenSSL-specific text
Signed-off-by: Steffan Karger <steffan@karger.me>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1417978095-19427-1-git-send-email-steffan@karger.me>
URL: http://article.gmane.org/gmane.network.openvpn.devel/9318
Signed-off-by: Gert Doering <gert@greenie.muc.de>
Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com>
Acked-by: Adriaan de Jong <dejong@fox-it.com>
Acked-by: David Sommerseth <davids@redhat.com>
Signed-off-by: David Sommerseth <davids@redhat.com>
