190 lines
4.2 KiB
C
190 lines
4.2 KiB
C
/*
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* Copyright (C) 2012 Martin Willi
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* Copyright (C) 2012 revosec AG
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "radattr_listener.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <daemon.h>
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#include <radius_message.h>
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/**
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* Maximum size of an attribute to add
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*/
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#define MAX_ATTR_SIZE 1024
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typedef struct private_radattr_listener_t private_radattr_listener_t;
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/**
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* Private data of an radattr_listener_t object.
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*/
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struct private_radattr_listener_t {
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/**
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* Public radattr_listener_t interface.
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*/
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radattr_listener_t public;
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/**
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* Directory to look for attribute files
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*/
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char *dir;
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/**
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* IKE_AUTH message ID to attribute
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*/
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int mid;
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};
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/**
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* Print RADIUS attributes found in IKE message notifies
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*/
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static void print_radius_attributes(private_radattr_listener_t *this,
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message_t *message)
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{
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radius_attribute_type_t type;
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enumerator_t *enumerator;
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notify_payload_t *notify;
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payload_t *payload;
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chunk_t data;
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enumerator = message->create_payload_enumerator(message);
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while (enumerator->enumerate(enumerator, &payload))
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{
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if (payload->get_type(payload) == PLV2_NOTIFY)
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{
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notify = (notify_payload_t*)payload;
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if (notify->get_notify_type(notify) == RADIUS_ATTRIBUTE)
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{
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data = notify->get_notification_data(notify);
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if (data.len >= 2)
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{
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type = data.ptr[0];
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data = chunk_skip(data, 2);
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if (chunk_printable(data, NULL, 0))
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{
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DBG1(DBG_IKE, "received RADIUS %N: %.*s",
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radius_attribute_type_names, type,
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(int)data.len, data.ptr);
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}
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else
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{
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DBG1(DBG_IKE, "received RADIUS %N: %#B",
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radius_attribute_type_names, type, &data);
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}
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}
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}
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}
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}
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enumerator->destroy(enumerator);
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}
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/**
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* Add a RADIUS attribute from a client-ID specific file to an IKE message
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*/
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static void add_radius_attribute(private_radattr_listener_t *this,
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ike_sa_t *ike_sa, message_t *message)
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{
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if (this->dir &&
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(this->mid == -1 || message->get_message_id(message) == this->mid))
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{
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identification_t *id;
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auth_cfg_t *auth;
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char path[PATH_MAX];
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chunk_t *data;
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auth = ike_sa->get_auth_cfg(ike_sa, TRUE);
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id = auth->get(auth, AUTH_RULE_EAP_IDENTITY);
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if (!id)
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{
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id = ike_sa->get_my_id(ike_sa);
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}
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snprintf(path, sizeof(path), "%s/%Y", this->dir, id);
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data = chunk_map(path, FALSE);
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if (data)
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{
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if (data->len >= 2)
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{
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DBG1(DBG_CFG, "adding RADIUS %N attribute",
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radius_attribute_type_names, data->ptr[0]);
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message->add_notify(message, FALSE, RADIUS_ATTRIBUTE, *data);
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}
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chunk_unmap(data);
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}
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else
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{
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DBG1(DBG_CFG, "reading RADIUS attribute '%s' failed: %s",
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path, strerror(errno));
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}
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}
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}
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METHOD(listener_t, message, bool,
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private_radattr_listener_t *this,
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ike_sa_t *ike_sa, message_t *message, bool incoming, bool plain)
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{
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if (plain && ike_sa->supports_extension(ike_sa, EXT_STRONGSWAN) &&
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message->get_exchange_type(message) == IKE_AUTH &&
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message->get_payload(message, PLV2_EAP))
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{
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if (incoming)
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{
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print_radius_attributes(this, message);
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}
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else
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{
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add_radius_attribute(this, ike_sa, message);
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}
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}
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return TRUE;
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}
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METHOD(radattr_listener_t, destroy, void,
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private_radattr_listener_t *this)
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{
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free(this);
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}
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/**
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* See header
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*/
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radattr_listener_t *radattr_listener_create()
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{
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private_radattr_listener_t *this;
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INIT(this,
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.public = {
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.listener = {
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.message = _message,
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},
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.destroy = _destroy,
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},
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.dir = lib->settings->get_str(lib->settings,
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"%s.plugins.radattr.dir", NULL, lib->ns),
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.mid = lib->settings->get_int(lib->settings,
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"%s.plugins.radattr.message_id", -1, lib->ns),
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);
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return &this->public;
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}
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