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58ec3bb4aa
The plug-in API in OpenVPN 2.x is not designed for running multiple deferred authentication processes in parallel. The authentication results of such configurations are not to be trusted. For now we bail out when this discovered with an error in the log. This is a backport of commit 282ddbac54f8d4923844f699 (master), taking the different man-page format into account. The code change is the same. CVE: 2022-0547 Signed-off-by: David Sommerseth <davids@openvpn.net> Acked-by: Gert Doering <gert@greenie.muc.de> Message-Id: <20220315155344.37787-3-openvpn@sf.lists.topphemmelig.net> URL: https://www.mail-archive.com/search?l=mid&q=20220315155344.37787-3-openvpn@sf.lists.topphemmelig.net Signed-off-by: Gert Doering <gert@greenie.muc.de>
OpenVPN Plugins
---------------
Starting with OpenVPN 2.0-beta17, compiled plugin modules are
supported on any *nix OS which includes libdl or on Windows.
One or more modules may be loaded into OpenVPN using
the --plugin directive, and each plugin module is capable of
intercepting any of the script callbacks which OpenVPN supports:
(1) up
(2) down
(3) route-up
(4) ipchange
(5) tls-verify
(6) auth-user-pass-verify
(7) client-connect
(8) client-disconnect
(9) learn-address
See the openvpn-plugin.h file in the top-level directory of the
OpenVPN source distribution for more detailed information
on the plugin interface.
Included Plugins
----------------
auth-pam -- Authenticate using PAM and a split privilege
execution model which functions even if
root privileges or the execution environment
have been altered with --user/--group/--chroot.
Tested on Linux only.
down-root -- Enable the running of down scripts with root privileges
even if --user/--group/--chroot have been used
to drop root privileges or change the execution
environment. Not applicable on Windows.
examples -- A simple example that demonstrates a portable
plugin, i.e. one which can be built for *nix
or Windows from the same source.
Building Plugins
----------------
cd to the top-level directory of a plugin, and use the
"make" command to build it. The examples plugin is
built using a build script, not a makefile.