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/*
** Copyright (C) 2006 Olivier DEMBOUR
** $Id: auth.c,v 1.19.4.7 2010/06/16 08:40:11 dembour Exp $
**
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** 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; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <time.h>
#include <string.h>
#include <strings.h>
#include <stdio.h>
#include <time.h>
#include "mycrypto.h"
#include "server.h"
#include "dns.h"
#include "list.h"
#include "requests.h"
#include "base64.h"
#include "myrand.h"
#include "socket.h"
#include "queue.h"
#include "auth.h"
#include "debug.h"
#include "log.h"
#include "queue.h"
#include "session.h"
/**
* @brief try to connect a client to a ressource
* @param[in] conf configuration
* @param[in] req DNS request
* @param[out] packet where to write the packet request
* @param[out] socket socket created
* @retval 0 on success
* @retval -1 on error
**/
static int connect_resource(t_conf *conf, t_request *req, t_packet *packet, int *sd)
{
t_list *list_resource;
char *resource;
int len;
resource = ((char *)packet) + PACKET_LEN;
if (!(len = strlen(resource)))
return (-1);
DPRINTF(1, "Ask for resource \'%s\'\n", resource);
for (list_resource = conf->resources; list_resource; list_resource = list_resource->next)
{
if ((!strncmp(list_resource->data, resource, len))
&& (list_resource->data[len] == ':'))
{
if (!(connect_socket(strchr(list_resource->data, ':') + 1, list_resource->info.port, sd)))
return (0);
packet->type = ERR;
send_ascii_reply(conf, req, packet, ERR_CONN_REFUSED);
return (-1);
}
}
packet->type = ERR;
send_ascii_reply(conf, req, packet, ERR_RESOURCE);
return (-1);
}
/**
* @brief try to bind a client to a ressource
* @param[in] conf configuration
* @param[in] req DNS request
* @param[in] packet packet request
* @param[in] client client to bind
* @retval 0 on success
* @retval -1 on error
**/
int bind_user(t_conf *conf, t_request *req, t_packet *packet, t_simple_list *client)
{
int sd;
char *resource;
char *compress;
if (connect_resource(conf, req, packet, &sd))
return (-1);
resource = ((char *)packet) + PACKET_LEN;
client_update_timer(client);
if (!(compress = jump_end_query(req,
GET_16(&(((struct dns_hdr *)req->data)->qdcount)), req->len)))
{
fprintf(stderr, "invalid reply\n");
return (-1);
}
client->sd_tcp = sd;
// FIXME bug ipv6 support
LOG("Bind client id: 0x%x address = %u.%u.%u.%u to resource %s", client->session_id,
#ifndef WORDS_BIGENDIAN
(unsigned int) ((req->sa.sin_addr.s_addr) & 0xff),
(unsigned int) ((req->sa.sin_addr.s_addr >> 8) & 0xff),
(unsigned int) ((req->sa.sin_addr.s_addr >> 16) & 0xff),
(unsigned int) ((req->sa.sin_addr.s_addr >> 24) & 0xff)
#else
(unsigned int) ((req->sa.sin_addr.s_addr >> 24) & 0xff),
(unsigned int) ((req->sa.sin_addr.s_addr >> 16) & 0xff),
(unsigned int) ((req->sa.sin_addr.s_addr >> 8) & 0xff),
(unsigned int) ((req->sa.sin_addr.s_addr) & 0xff)
#endif
, resource);
packet->type = OK;
return (send_ascii_reply(conf, req, packet, ""));
}
/**
* @brief try to authenticate (more a indentification) a client with CHAP
* @param[in] conf configuration
* @param[in] req DNS request
* @param[in] packet packet request
* @retval 0 on success
* @retval -1 on error
**/
int login_user(t_conf *conf, t_request *req, t_packet *packet, t_simple_list *unused)
{
char *data;
t_simple_list *client;
char buffer[SHA1_SIZE*2+1];
memset(buffer, 0, sizeof(buffer));
if (req->len <= PACKET_LEN)
return (-1);
data = ((char *) packet) + PACKET_LEN;
client = find_client_by_session_id(conf, packet->session_id);
if (client)
{
if (conf->key)
{
sign_challenge(client->control.challenge, CHALLENGE_SIZE, conf->key, (char *)&buffer, sizeof(buffer));
if (strncmp(buffer, data, SHA1_SIZE*2))
{
packet->type = ERR;
LOG("Authentication failed");
send_ascii_reply(conf, req, packet, ERR_AUTH_FAILED);
return (delete_client(conf, client));
}
}
client_update_timer(client);
client->control.authenticated = 1;
client->sd_tcp = -1;
packet->type = OK;
return (send_ascii_reply(conf, req, packet, ""));
}
if (!(client = create_session(conf, req, packet)))
return (-1);
alphanum_random(client->control.challenge, CHALLENGE_SIZE);
packet->type = OK;
packet->session_id = client->session_id;
return (send_ascii_reply(conf, req, packet, client->control.challenge));
}
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