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-rw-r--r--main/openvpn/src/plugins/down-root/Makefile.am23
-rw-r--r--main/openvpn/src/plugins/down-root/Makefile.in563
-rw-r--r--main/openvpn/src/plugins/down-root/README.down-root29
-rw-r--r--main/openvpn/src/plugins/down-root/down-root.c557
-rw-r--r--main/openvpn/src/plugins/down-root/down-root.exports4
5 files changed, 1176 insertions, 0 deletions
diff --git a/main/openvpn/src/plugins/down-root/Makefile.am b/main/openvpn/src/plugins/down-root/Makefile.am
new file mode 100644
index 00000000..064aa30c
--- /dev/null
+++ b/main/openvpn/src/plugins/down-root/Makefile.am
@@ -0,0 +1,23 @@
+#
+# OpenVPN (TM) Down Root Plugin -- OpenVPN Plugin
+#
+# Copyright (C) 2012 Alon Bar-Lev <alon.barlev@gmail.com>
+#
+
+MAINTAINERCLEANFILES = \
+ $(srcdir)/Makefile.in
+
+AM_CFLAGS = \
+ -I$(top_srcdir)/include
+
+if ENABLE_PLUGIN_DOWN_ROOT
+plugin_LTLIBRARIES = openvpn-plugin-down-root.la
+dist_doc_DATA = README.down-root
+endif
+
+openvpn_plugin_down_root_la_SOURCES = \
+ down-root.c \
+ down-root.exports
+openvpn_plugin_down_root_la_LDFLAGS = $(AM_LDFLAGS) \
+ -export-symbols "$(srcdir)/down-root.exports" \
+ -module -shared -avoid-version -no-undefined
diff --git a/main/openvpn/src/plugins/down-root/Makefile.in b/main/openvpn/src/plugins/down-root/Makefile.in
new file mode 100644
index 00000000..fa06a466
--- /dev/null
+++ b/main/openvpn/src/plugins/down-root/Makefile.in
@@ -0,0 +1,563 @@
+# Makefile.in generated by automake 1.10 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
+# 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+#
+# OpenVPN (TM) Down Root Plugin -- OpenVPN Plugin
+#
+# Copyright (C) 2012 Alon Bar-Lev <alon.barlev@gmail.com>
+#
+
+
+VPATH = @srcdir@
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+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
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+am_openvpn_plugin_down_root_la_OBJECTS = down-root.lo
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+ $(am_openvpn_plugin_down_root_la_OBJECTS)
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+DIST_SOURCES = $(openvpn_plugin_down_root_la_SOURCES)
+am__dist_doc_DATA_DIST = README.down-root
+dist_docDATA_INSTALL = $(INSTALL_DATA)
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+ -I$(top_srcdir)/include
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+@ENABLE_PLUGIN_DOWN_ROOT_TRUE@dist_doc_DATA = README.down-root
+openvpn_plugin_down_root_la_SOURCES = \
+ down-root.c \
+ down-root.exports
+
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+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+ @$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+ $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+ install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+ `test -z '$(STRIP)' || \
+ echo "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'"` install
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+ -test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+
+maintainer-clean-generic:
+ @echo "This command is intended for maintainers to use"
+ @echo "it deletes files that may require special tools to rebuild."
+ -test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-pluginLTLIBRARIES \
+ mostlyclean-am
+
+distclean: distclean-am
+ -rm -rf ./$(DEPDIR)
+ -rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+ distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+info: info-am
+
+info-am:
+
+install-data-am: install-dist_docDATA install-pluginLTLIBRARIES
+
+install-dvi: install-dvi-am
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-info: install-info-am
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-ps: install-ps-am
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+ -rm -rf ./$(DEPDIR)
+ -rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+ mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-dist_docDATA uninstall-pluginLTLIBRARIES
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS all all-am check check-am clean clean-generic \
+ clean-libtool clean-pluginLTLIBRARIES ctags distclean \
+ distclean-compile distclean-generic distclean-libtool \
+ distclean-tags distdir dvi dvi-am html html-am info info-am \
+ install install-am install-data install-data-am \
+ install-dist_docDATA install-dvi install-dvi-am install-exec \
+ install-exec-am install-html install-html-am install-info \
+ install-info-am install-man install-pdf install-pdf-am \
+ install-pluginLTLIBRARIES install-ps install-ps-am \
+ install-strip installcheck installcheck-am installdirs \
+ maintainer-clean maintainer-clean-generic mostlyclean \
+ mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+ pdf pdf-am ps ps-am tags uninstall uninstall-am \
+ uninstall-dist_docDATA uninstall-pluginLTLIBRARIES
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/main/openvpn/src/plugins/down-root/README.down-root b/main/openvpn/src/plugins/down-root/README.down-root
new file mode 100644
index 00000000..d337ffe9
--- /dev/null
+++ b/main/openvpn/src/plugins/down-root/README.down-root
@@ -0,0 +1,29 @@
+down-root -- an OpenVPN Plugin Module
+
+SYNOPSIS
+
+The down-root module allows an OpenVPN configuration to
+call a down script with root privileges, even when privileges
+have been dropped using --user/--group/--chroot.
+
+This module uses a split privilege execution model which will
+fork() before OpenVPN drops root privileges, at the point where
+the --up script is usually called. The module will then remain
+in a wait state until it receives a message from OpenVPN via
+pipe to execute the down script. Thus, the down script will be
+run in the same execution environment as the up script.
+
+BUILD
+
+Build this module with the "make" command. The plugin
+module will be named openvpn-down-root.so
+
+USAGE
+
+To use this module, add to your OpenVPN config file:
+
+ plugin openvpn-down-root.so "command ..."
+
+CAVEATS
+
+This module will only work on *nix systems, not Windows.
diff --git a/main/openvpn/src/plugins/down-root/down-root.c b/main/openvpn/src/plugins/down-root/down-root.c
new file mode 100644
index 00000000..d51d0e55
--- /dev/null
+++ b/main/openvpn/src/plugins/down-root/down-root.c
@@ -0,0 +1,557 @@
+/*
+ * OpenVPN -- An application to securely tunnel IP networks
+ * over a single TCP/UDP port, with support for SSL/TLS-based
+ * session authentication and key exchange,
+ * packet encryption, packet authentication, and
+ * packet compression.
+ *
+ * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (see the file COPYING included with this
+ * distribution); if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/*
+ * OpenVPN plugin module to do privileged down-script execution.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <syslog.h>
+
+#include <openvpn-plugin.h>
+
+#define DEBUG(verb) ((verb) >= 7)
+
+/* Command codes for foreground -> background communication */
+#define COMMAND_RUN_SCRIPT 0
+#define COMMAND_EXIT 1
+
+/* Response codes for background -> foreground communication */
+#define RESPONSE_INIT_SUCCEEDED 10
+#define RESPONSE_INIT_FAILED 11
+#define RESPONSE_SCRIPT_SUCCEEDED 12
+#define RESPONSE_SCRIPT_FAILED 13
+
+/* Background process function */
+static void down_root_server (const int fd, char *command, const char *argv[], const char *envp[], const int verb);
+
+/*
+ * Plugin state, used by foreground
+ */
+struct down_root_context
+{
+ /* Foreground's socket to background process */
+ int foreground_fd;
+
+ /* Process ID of background process */
+ pid_t background_pid;
+
+ /* Verbosity level of OpenVPN */
+ int verb;
+
+ /* down command */
+ char *command;
+};
+
+/*
+ * Given an environmental variable name, search
+ * the envp array for its value, returning it
+ * if found or NULL otherwise.
+ */
+static const char *
+get_env (const char *name, const char *envp[])
+{
+ if (envp)
+ {
+ int i;
+ const int namelen = strlen (name);
+ for (i = 0; envp[i]; ++i)
+ {
+ if (!strncmp (envp[i], name, namelen))
+ {
+ const char *cp = envp[i] + namelen;
+ if (*cp == '=')
+ return cp + 1;
+ }
+ }
+ }
+ return NULL;
+}
+
+/*
+ * Return the length of a string array
+ */
+static int
+string_array_len (const char *array[])
+{
+ int i = 0;
+ if (array)
+ {
+ while (array[i])
+ ++i;
+ }
+ return i;
+}
+
+/*
+ * Socket read/write functions.
+ */
+
+static int
+recv_control (int fd)
+{
+ unsigned char c;
+ const ssize_t size = read (fd, &c, sizeof (c));
+ if (size == sizeof (c))
+ return c;
+ else
+ return -1;
+}
+
+static int
+send_control (int fd, int code)
+{
+ unsigned char c = (unsigned char) code;
+ const ssize_t size = write (fd, &c, sizeof (c));
+ if (size == sizeof (c))
+ return (int) size;
+ else
+ return -1;
+}
+
+/*
+ * Daemonize if "daemon" env var is true.
+ * Preserve stderr across daemonization if
+ * "daemon_log_redirect" env var is true.
+ */
+static void
+daemonize (const char *envp[])
+{
+ const char *daemon_string = get_env ("daemon", envp);
+ if (daemon_string && daemon_string[0] == '1')
+ {
+ const char *log_redirect = get_env ("daemon_log_redirect", envp);
+ int fd = -1;
+ if (log_redirect && log_redirect[0] == '1')
+ fd = dup (2);
+ if (daemon (0, 0) < 0)
+ {
+ fprintf (stderr, "DOWN-ROOT: daemonization failed\n");
+ }
+ else if (fd >= 3)
+ {
+ dup2 (fd, 2);
+ close (fd);
+ }
+ }
+}
+
+/*
+ * Close most of parent's fds.
+ * Keep stdin/stdout/stderr, plus one
+ * other fd which is presumed to be
+ * our pipe back to parent.
+ * Admittedly, a bit of a kludge,
+ * but posix doesn't give us a kind
+ * of FD_CLOEXEC which will stop
+ * fds from crossing a fork().
+ */
+static void
+close_fds_except (int keep)
+{
+ int i;
+ closelog ();
+ for (i = 3; i <= 100; ++i)
+ {
+ if (i != keep)
+ close (i);
+ }
+}
+
+/*
+ * Usually we ignore signals, because our parent will
+ * deal with them.
+ */
+static void
+set_signals (void)
+{
+ signal (SIGTERM, SIG_DFL);
+
+ signal (SIGINT, SIG_IGN);
+ signal (SIGHUP, SIG_IGN);
+ signal (SIGUSR1, SIG_IGN);
+ signal (SIGUSR2, SIG_IGN);
+ signal (SIGPIPE, SIG_IGN);
+}
+
+/*
+ * convert system() return into a success/failure value
+ */
+int
+system_ok (int stat)
+{
+#ifdef WIN32
+ return stat == 0;
+#else
+ return stat != -1 && WIFEXITED (stat) && WEXITSTATUS (stat) == 0;
+#endif
+}
+
+static char *
+build_command_line (const char *argv[])
+{
+ int size = 0;
+ int n = 0;
+ int i;
+ char *string;
+
+ /* precompute size */
+ if (argv)
+ {
+ for (i = 0; argv[i]; ++i)
+ {
+ size += (strlen (argv[i]) + 1); /* string length plus trailing space */
+ ++n;
+ }
+ }
+ ++size; /* for null terminator */
+
+ /* allocate memory */
+ string = (char *) malloc (size);
+ if (!string)
+ {
+ fprintf (stderr, "DOWN-ROOT: out of memory\n");
+ exit (1);
+ }
+ string[0] = '\0';
+
+ /* build string */
+ for (i = 0; i < n; ++i)
+ {
+ strcat (string, argv[i]);
+ if (i + 1 < n)
+ strcat (string, " ");
+ }
+ return string;
+}
+
+static void
+free_context (struct down_root_context *context)
+{
+ if (context)
+ {
+ if (context->command)
+ free (context->command);
+ free (context);
+ }
+}
+
+OPENVPN_EXPORT openvpn_plugin_handle_t
+openvpn_plugin_open_v1 (unsigned int *type_mask, const char *argv[], const char *envp[])
+{
+ struct down_root_context *context;
+
+ /*
+ * Allocate our context
+ */
+ context = (struct down_root_context *) calloc (1, sizeof (struct down_root_context));
+ if (!context)
+ goto error;
+ context->foreground_fd = -1;
+
+ /*
+ * Intercept the --up and --down callbacks
+ */
+ *type_mask = OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_UP) | OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_DOWN);
+
+ /*
+ * Make sure we have two string arguments: the first is the .so name,
+ * the second is the script command.
+ */
+ if (string_array_len (argv) < 2)
+ {
+ fprintf (stderr, "DOWN-ROOT: need down script command\n");
+ goto error;
+ }
+
+ /*
+ * Save our argument in context
+ */
+ context->command = build_command_line (&argv[1]);
+
+ /*
+ * Get verbosity level from environment
+ */
+ {
+ const char *verb_string = get_env ("verb", envp);
+ if (verb_string)
+ context->verb = atoi (verb_string);
+ }
+
+ return (openvpn_plugin_handle_t) context;
+
+ error:
+ free_context (context);
+ return NULL;
+}
+
+OPENVPN_EXPORT int
+openvpn_plugin_func_v1 (openvpn_plugin_handle_t handle, const int type, const char *argv[], const char *envp[])
+{
+ struct down_root_context *context = (struct down_root_context *) handle;
+
+ if (type == OPENVPN_PLUGIN_UP && context->foreground_fd == -1) /* fork off a process to hold onto root */
+ {
+ pid_t pid;
+ int fd[2];
+
+ /*
+ * Make a socket for foreground and background processes
+ * to communicate.
+ */
+ if (socketpair (PF_UNIX, SOCK_DGRAM, 0, fd) == -1)
+ {
+ fprintf (stderr, "DOWN-ROOT: socketpair call failed\n");
+ return OPENVPN_PLUGIN_FUNC_ERROR;
+ }
+
+ /*
+ * Fork off the privileged process. It will remain privileged
+ * even after the foreground process drops its privileges.
+ */
+ pid = fork ();
+
+ if (pid)
+ {
+ int status;
+
+ /*
+ * Foreground Process
+ */
+
+ context->background_pid = pid;
+
+ /* close our copy of child's socket */
+ close (fd[1]);
+
+ /* don't let future subprocesses inherit child socket */
+ if (fcntl (fd[0], F_SETFD, FD_CLOEXEC) < 0)
+ fprintf (stderr, "DOWN-ROOT: Set FD_CLOEXEC flag on socket file descriptor failed\n");
+
+ /* wait for background child process to initialize */
+ status = recv_control (fd[0]);
+ if (status == RESPONSE_INIT_SUCCEEDED)
+ {
+ context->foreground_fd = fd[0];
+ return OPENVPN_PLUGIN_FUNC_SUCCESS;
+ }
+ }
+ else
+ {
+ /*
+ * Background Process
+ */
+
+ /* close all parent fds except our socket back to parent */
+ close_fds_except (fd[1]);
+
+ /* Ignore most signals (the parent will receive them) */
+ set_signals ();
+
+ /* Daemonize if --daemon option is set. */
+ daemonize (envp);
+
+ /* execute the event loop */
+ down_root_server (fd[1], context->command, argv, envp, context->verb);
+
+ close (fd[1]);
+ exit (0);
+ return 0; /* NOTREACHED */
+ }
+ }
+ else if (type == OPENVPN_PLUGIN_DOWN && context->foreground_fd >= 0)
+ {
+ if (send_control (context->foreground_fd, COMMAND_RUN_SCRIPT) == -1)
+ {
+ fprintf (stderr, "DOWN-ROOT: Error sending script execution signal to background process\n");
+ }
+ else
+ {
+ const int status = recv_control (context->foreground_fd);
+ if (status == RESPONSE_SCRIPT_SUCCEEDED)
+ return OPENVPN_PLUGIN_FUNC_SUCCESS;
+ if (status == -1)
+ fprintf (stderr, "DOWN-ROOT: Error receiving script execution confirmation from background process\n");
+ }
+ }
+ return OPENVPN_PLUGIN_FUNC_ERROR;
+}
+
+OPENVPN_EXPORT void
+openvpn_plugin_close_v1 (openvpn_plugin_handle_t handle)
+{
+ struct down_root_context *context = (struct down_root_context *) handle;
+
+ if (DEBUG (context->verb))
+ fprintf (stderr, "DOWN-ROOT: close\n");
+
+ if (context->foreground_fd >= 0)
+ {
+ /* tell background process to exit */
+ if (send_control (context->foreground_fd, COMMAND_EXIT) == -1)
+ fprintf (stderr, "DOWN-ROOT: Error signaling background process to exit\n");
+
+ /* wait for background process to exit */
+ if (context->background_pid > 0)
+ waitpid (context->background_pid, NULL, 0);
+
+ close (context->foreground_fd);
+ context->foreground_fd = -1;
+ }
+
+ free_context (context);
+}
+
+OPENVPN_EXPORT void
+openvpn_plugin_abort_v1 (openvpn_plugin_handle_t handle)
+{
+ struct down_root_context *context = (struct down_root_context *) handle;
+
+ if (context && context->foreground_fd >= 0)
+ {
+ /* tell background process to exit */
+ send_control (context->foreground_fd, COMMAND_EXIT);
+ close (context->foreground_fd);
+ context->foreground_fd = -1;
+ }
+}
+
+/*
+ * Background process -- runs with privilege.
+ */
+static void
+down_root_server (const int fd, char *command, const char *argv[], const char *envp[], const int verb)
+{
+ const char *p[3];
+ char *command_line = NULL;
+ char *argv_cat = NULL;
+ int i;
+
+ /*
+ * Do initialization
+ */
+ if (DEBUG (verb))
+ fprintf (stderr, "DOWN-ROOT: BACKGROUND: INIT command='%s'\n", command);
+
+ /*
+ * Tell foreground that we initialized successfully
+ */
+ if (send_control (fd, RESPONSE_INIT_SUCCEEDED) == -1)
+ {
+ fprintf (stderr, "DOWN-ROOT: BACKGROUND: write error on response socket [1]\n");
+ goto done;
+ }
+
+ /*
+ * Build command line
+ */
+ if (string_array_len (argv) >= 2)
+ argv_cat = build_command_line (&argv[1]);
+ else
+ argv_cat = build_command_line (NULL);
+ p[0] = command;
+ p[1] = argv_cat;
+ p[2] = NULL;
+ command_line = build_command_line (p);
+
+ /*
+ * Save envp in environment
+ */
+ for (i = 0; envp[i]; ++i)
+ {
+ putenv ((char *)envp[i]);
+ }
+
+ /*
+ * Event loop
+ */
+ while (1)
+ {
+ int command_code;
+ int status;
+
+ /* get a command from foreground process */
+ command_code = recv_control (fd);
+
+ if (DEBUG (verb))
+ fprintf (stderr, "DOWN-ROOT: BACKGROUND: received command code: %d\n", command_code);
+
+ switch (command_code)
+ {
+ case COMMAND_RUN_SCRIPT:
+ status = system (command_line);
+ if (system_ok (status)) /* Succeeded */
+ {
+ if (send_control (fd, RESPONSE_SCRIPT_SUCCEEDED) == -1)
+ {
+ fprintf (stderr, "DOWN-ROOT: BACKGROUND: write error on response socket [2]\n");
+ goto done;
+ }
+ }
+ else /* Failed */
+ {
+ if (send_control (fd, RESPONSE_SCRIPT_FAILED) == -1)
+ {
+ fprintf (stderr, "DOWN-ROOT: BACKGROUND: write error on response socket [3]\n");
+ goto done;
+ }
+ }
+ break;
+
+ case COMMAND_EXIT:
+ goto done;
+
+ case -1:
+ fprintf (stderr, "DOWN-ROOT: BACKGROUND: read error on command channel\n");
+ goto done;
+
+ default:
+ fprintf (stderr, "DOWN-ROOT: BACKGROUND: unknown command code: code=%d, exiting\n",
+ command_code);
+ goto done;
+ }
+ }
+
+ done:
+ if (argv_cat)
+ free (argv_cat);
+ if (command_line)
+ free (command_line);
+ if (DEBUG (verb))
+ fprintf (stderr, "DOWN-ROOT: BACKGROUND: EXIT\n");
+
+ return;
+}
diff --git a/main/openvpn/src/plugins/down-root/down-root.exports b/main/openvpn/src/plugins/down-root/down-root.exports
new file mode 100644
index 00000000..b07937cc
--- /dev/null
+++ b/main/openvpn/src/plugins/down-root/down-root.exports
@@ -0,0 +1,4 @@
+openvpn_plugin_open_v1
+openvpn_plugin_func_v1
+openvpn_plugin_close_v1
+openvpn_plugin_abort_v1