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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <netinet/in.h>
#include <sys/kmem.h>
#include <sys/random.h>
#include <sys/socket.h>
#include "chap.h"
#include <sys/scsi/adapters/iscsi_if.h>
#include "iscsi.h"
#include <sys/md5.h>
#include "radius_packet.h"
#include "radius_protocol.h"
#include "radius_auth.h"
#include <sys/sunddi.h>
/* Forward declaration */
/*
* Annotate the radius_attr_t objects with authentication data.
*/
static
void
set_radius_attrs(radius_packet_data_t *req,
char *target_chap_name,
unsigned char *target_response,
uint32_t response_length,
uint8_t *challenge,
uint32_t challenge_length);
/*
* See radius_auth.h.
*/
/* ARGSUSED */
chap_validation_status_type
radius_chap_validate(char *target_chap_name,
char *initiator_chap_name,
uint8_t *challenge,
uint32_t challenge_length,
uint8_t *target_response,
uint32_t response_length,
uint8_t identifier,
iscsi_ipaddr_t rad_svr_ip_addr,
uint32_t rad_svr_port,
uint8_t *rad_svr_shared_secret,
uint32_t rad_svr_shared_secret_len)
{
chap_validation_status_type validation_status;
char lbolt[64];
int rcv_status;
void *socket;
radius_packet_data_t req;
radius_packet_data_t resp;
MD5_CTX context;
uint8_t md5_digest[16]; /* MD5 digest length 16 */
uint8_t random_number[16];
if (rad_svr_shared_secret_len == 0) {
/* The secret must not be empty (section 3, RFC 2865) */
cmn_err(CE_WARN, "empty RADIUS shared secret");
return (CHAP_VALIDATION_BAD_RADIUS_SECRET);
}
bzero(&req, sizeof (radius_packet_data_t));
req.identifier = identifier;
req.code = RAD_ACCESS_REQ;
set_radius_attrs(&req,
target_chap_name,
target_response,
response_length,
challenge,
challenge_length);
/* Prepare the request authenticator */
MD5Init(&context);
bzero(&md5_digest, 16);
/* First, the shared secret */
MD5Update(&context, rad_svr_shared_secret, rad_svr_shared_secret_len);
/* Then a unique number - use lbolt plus a random number */
bzero(&lbolt, sizeof (lbolt));
(void) snprintf(lbolt, sizeof (lbolt), "%lx", ddi_get_lbolt());
MD5Update(&context, (uint8_t *)lbolt, strlen(lbolt));
bzero(&random_number, sizeof (random_number));
(void) random_get_pseudo_bytes(random_number,
sizeof (random_number));
MD5Update(&context, random_number, sizeof (random_number));
MD5Final(md5_digest, &context);
bcopy(md5_digest, &req.authenticator, RAD_AUTHENTICATOR_LEN);
socket = iscsi_net->socket(AF_INET, SOCK_DGRAM, 0);
if (socket == NULL) {
/* Error obtaining socket for RADIUS use */
return (CHAP_VALIDATION_RADIUS_ACCESS_ERROR);
}
/* Send the authentication access request to the RADIUS server */
if (snd_radius_request(socket,
rad_svr_ip_addr,
rad_svr_port,
&req) == -1) {
return (CHAP_VALIDATION_RADIUS_ACCESS_ERROR);
}
bzero(&resp, sizeof (radius_packet_data_t));
/* Analyze the response coming through from the same socket. */
rcv_status = rcv_radius_response(socket,
rad_svr_shared_secret,
rad_svr_shared_secret_len,
req.authenticator, &resp);
if (rcv_status == RAD_RSP_RCVD_SUCCESS) {
if (resp.code == RAD_ACCESS_ACPT) {
validation_status = CHAP_VALIDATION_PASSED;
} else if (resp.code == RAD_ACCESS_REJ) {
validation_status = CHAP_VALIDATION_INVALID_RESPONSE;
} else {
validation_status =
CHAP_VALIDATION_UNKNOWN_RADIUS_CODE;
}
} else if (rcv_status == RAD_RSP_RCVD_AUTH_FAILED) {
cmn_err(CE_WARN, "RADIUS packet authentication failed");
validation_status = CHAP_VALIDATION_BAD_RADIUS_SECRET;
} else {
validation_status = CHAP_VALIDATION_RADIUS_ACCESS_ERROR;
}
iscsi_net->close(socket);
return (validation_status);
}
/* See forward declaration. */
static void
set_radius_attrs(radius_packet_data_t *req,
char *target_chap_name,
unsigned char *target_response,
uint32_t response_length,
uint8_t *challenge,
uint32_t challenge_length)
{
req->attrs[0].attr_type_code = RAD_USER_NAME;
(void) strncpy((char *)req->attrs[0].attr_value,
(const char *)target_chap_name,
strlen(target_chap_name));
req->attrs[0].attr_value_len = strlen(target_chap_name);
req->attrs[1].attr_type_code = RAD_CHAP_PASSWORD;
bcopy(target_response,
(char *)req->attrs[1].attr_value,
min(response_length, sizeof (req->attrs[1].attr_value)));
/* A target response is an MD5 hash thus its length has to be 16. */
req->attrs[1].attr_value_len = response_length;
req->attrs[2].attr_type_code = RAD_CHAP_CHALLENGE;
bcopy(challenge,
(char *)req->attrs[2].attr_value,
min(challenge_length, sizeof (req->attrs[2].attr_value)));
req->attrs[2].attr_value_len = challenge_length;
/* 3 attributes associated with each RADIUS packet. */
req->num_of_attrs = 3;
}
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