From 8dd0350e1607aa30f7a043c8d5ec7a7eeb874115 Mon Sep 17 00:00:00 2001 From: Alberto Gonzalez Iniesta Date: Mon, 5 Nov 2012 16:28:09 +0100 Subject: Imported Upstream version 2.3_rc1 --- sample/sample-plugins/log/log_v3.c | 247 +++++++++++++++++++++++++++++++++++++ 1 file changed, 247 insertions(+) create mode 100644 sample/sample-plugins/log/log_v3.c (limited to 'sample/sample-plugins/log/log_v3.c') diff --git a/sample/sample-plugins/log/log_v3.c b/sample/sample-plugins/log/log_v3.c new file mode 100644 index 0000000..742c756 --- /dev/null +++ b/sample/sample-plugins/log/log_v3.c @@ -0,0 +1,247 @@ +/* + * 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) 2002-2009 OpenVPN Technologies, Inc. + * Copyright (C) 2010 David Sommerseth + * + * 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 + */ + +/* + * This plugin is similar to simple.c, except it also logs extra information + * to stdout for every plugin method called by OpenVPN. The only difference + * between this (log_v3.c) and log.c is that this module uses the v3 plug-in + * API. + * + * See the README file for build instructions. + */ + +#include +#include +#include + +#define ENABLE_SSL + +#include "openvpn-plugin.h" + +/* + * Our context, where we keep our state. + */ +struct plugin_context { + const char *username; + const char *password; +}; + +/* + * 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; +} + +OPENVPN_EXPORT int +openvpn_plugin_open_v3 (const int v3structver, + struct openvpn_plugin_args_open_in const *args, + struct openvpn_plugin_args_open_return *ret) +{ + struct plugin_context *context = NULL; + + /* Check that we are API compatible */ + if( v3structver != OPENVPN_PLUGINv3_STRUCTVER ) { + return OPENVPN_PLUGIN_FUNC_ERROR; + } + + /* Which callbacks to intercept. */ + ret->type_mask = + OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_UP) | + OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_DOWN) | + OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_ROUTE_UP) | + OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_IPCHANGE) | + OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_TLS_VERIFY) | + OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY) | + OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_CLIENT_CONNECT_V2) | + OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_CLIENT_DISCONNECT) | + OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_LEARN_ADDRESS) | + OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_TLS_FINAL); + + + /* Allocate our context */ + context = (struct plugin_context *) calloc (1, sizeof (struct plugin_context)); + + /* Set the username/password we will require. */ + context->username = "foo"; + context->password = "bar"; + + /* Point the global context handle to our newly created context */ + ret->handle = (void *) context; + + return OPENVPN_PLUGIN_FUNC_SUCCESS; +} + +void +show (const int type, const char *argv[], const char *envp[]) +{ + size_t i; + switch (type) + { + case OPENVPN_PLUGIN_UP: + printf ("OPENVPN_PLUGIN_UP\n"); + break; + case OPENVPN_PLUGIN_DOWN: + printf ("OPENVPN_PLUGIN_DOWN\n"); + break; + case OPENVPN_PLUGIN_ROUTE_UP: + printf ("OPENVPN_PLUGIN_ROUTE_UP\n"); + break; + case OPENVPN_PLUGIN_IPCHANGE: + printf ("OPENVPN_PLUGIN_IPCHANGE\n"); + break; + case OPENVPN_PLUGIN_TLS_VERIFY: + printf ("OPENVPN_PLUGIN_TLS_VERIFY\n"); + break; + case OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY: + printf ("OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY\n"); + break; + case OPENVPN_PLUGIN_CLIENT_CONNECT_V2: + printf ("OPENVPN_PLUGIN_CLIENT_CONNECT_V2\n"); + break; + case OPENVPN_PLUGIN_CLIENT_DISCONNECT: + printf ("OPENVPN_PLUGIN_CLIENT_DISCONNECT\n"); + break; + case OPENVPN_PLUGIN_LEARN_ADDRESS: + printf ("OPENVPN_PLUGIN_LEARN_ADDRESS\n"); + break; + case OPENVPN_PLUGIN_TLS_FINAL: + printf ("OPENVPN_PLUGIN_TLS_FINAL\n"); + break; + default: + printf ("OPENVPN_PLUGIN_?\n"); + break; + } + + printf ("ARGV\n"); + for (i = 0; argv[i] != NULL; ++i) + printf ("%d '%s'\n", (int)i, argv[i]); + + printf ("ENVP\n"); + for (i = 0; envp[i] != NULL; ++i) + printf ("%d '%s'\n", (int)i, envp[i]); +} + +static void +x509_print_info (X509 *x509crt) +{ + int i, n; + int fn_nid; + ASN1_OBJECT *fn; + ASN1_STRING *val; + X509_NAME *x509_name; + X509_NAME_ENTRY *ent; + const char *objbuf; + unsigned char *buf; + + x509_name = X509_get_subject_name (x509crt); + n = X509_NAME_entry_count (x509_name); + for (i = 0; i < n; ++i) + { + ent = X509_NAME_get_entry (x509_name, i); + if (!ent) + continue; + fn = X509_NAME_ENTRY_get_object (ent); + if (!fn) + continue; + val = X509_NAME_ENTRY_get_data (ent); + if (!val) + continue; + fn_nid = OBJ_obj2nid (fn); + if (fn_nid == NID_undef) + continue; + objbuf = OBJ_nid2sn (fn_nid); + if (!objbuf) + continue; + buf = (unsigned char *)1; /* bug in OpenSSL 0.9.6b ASN1_STRING_to_UTF8 requires this workaround */ + if (ASN1_STRING_to_UTF8 (&buf, val) <= 0) + continue; + + printf("X509 %s: %s\n", objbuf, (char *)buf); + OPENSSL_free (buf); + } +} + + + +OPENVPN_EXPORT int +openvpn_plugin_func_v3 (const int version, + struct openvpn_plugin_args_func_in const *args, + struct openvpn_plugin_args_func_return *retptr) +{ + struct plugin_context *context = (struct plugin_context *) args->handle; + + printf("\nopenvpn_plugin_func_v3() :::::>> "); + show (args->type, args->argv, args->envp); + + /* Dump some X509 information if we're in the TLS_VERIFY phase */ + if ((args->type == OPENVPN_PLUGIN_TLS_VERIFY) && args->current_cert ) { + printf("---- X509 Subject information ----\n"); + printf("Certificate depth: %i\n", args->current_cert_depth); + x509_print_info(args->current_cert); + printf("----------------------------------\n"); + } + + /* check entered username/password against what we require */ + if (args->type == OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY) + { + /* get username/password from envp string array */ + const char *username = get_env ("username", args->envp); + const char *password = get_env ("password", args->envp); + + if (username && !strcmp (username, context->username) + && password && !strcmp (password, context->password)) + return OPENVPN_PLUGIN_FUNC_SUCCESS; + else + return OPENVPN_PLUGIN_FUNC_ERROR; + } + else + return OPENVPN_PLUGIN_FUNC_SUCCESS; +} + +OPENVPN_EXPORT void +openvpn_plugin_close_v1 (openvpn_plugin_handle_t handle) +{ + struct plugin_context *context = (struct plugin_context *) handle; + free (context); +} -- cgit v1.2.3