radius_packet.c revision fcf3ce441efd61da9bb2884968af01cb7c1452cc
/*
* 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 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include "iscsi.h"
#include <sys/scsi/adapters/iscsi_if.h>
#include "radius_packet.h"
#include "radius_protocol.h"
#include <sys/int_types.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/sunddi.h>
static void encode_chap_password(int identifier, int chap_passwd_len,
uint8_t *chap_passwd, uint8_t *result);
/*
* See radius_packet.h.
*/
int
snd_radius_request(void *socket, iscsi_ipaddr_t rsvr_ip_addr,
uint32_t rsvr_port, radius_packet_data_t *req_data)
{
int i; /* Loop counter. */
int data_len;
int len;
ushort_t total_length; /* Has to be 2 octets in size */
uint8_t *ptr; /* Pointer to RADIUS packet data */
uint8_t *length_ptr; /* Points to the Length field of the */
/* packet. */
uint8_t *data; /* RADIUS data to be sent */
radius_attr_t *req_attr; /* Request attributes */
radius_packet_t *packet; /* Outbound RADIUS packet */
union {
struct sockaddr_in s_in4;
struct sockaddr_in6 s_in6;
} sa_rsvr; /* Socket address of the server */
struct nmsghdr msg;
struct iovec iov[1];
/*
* Create a RADIUS packet with minimal length for now.
*/
total_length = MIN_RAD_PACKET_LEN;
data = kmem_zalloc(MAX_RAD_PACKET_LEN, KM_SLEEP);
packet = (radius_packet_t *)data;
packet->code = req_data->code;
packet->identifier = req_data->identifier;
bcopy(req_data->authenticator, packet->authenticator,
RAD_AUTHENTICATOR_LEN);
ptr = packet->data;
/* Loop over all attributes of the request. */
for (i = 0; i < req_data->num_of_attrs; i++) {
if (total_length > MAX_RAD_PACKET_LEN) {
/* The packet has exceed its maximum size. */
kmem_free(data, MAX_RAD_PACKET_LEN);
return (-1);
}
req_attr = &req_data->attrs[i];
*ptr++ = (req_attr->attr_type_code & 0xFF);
length_ptr = ptr;
/* Length is 2 octets - RFC 2865 section 3 */
*ptr++ = 2;
total_length += 2;
/* If the attribute is CHAP-Password, encode it. */
if (req_attr->attr_type_code == RAD_CHAP_PASSWORD) {
/*
* Identifier plus CHAP response. RFC 2865
* section 5.3.
*/
uint8_t encoded_chap_passwd[RAD_CHAP_PASSWD_STR_LEN +
RAD_IDENTIFIER_LEN + 1];
encode_chap_password
(req_data->identifier,
req_attr->attr_value_len,
req_attr->attr_value,
encoded_chap_passwd);
req_attr->attr_value_len = RAD_CHAP_PASSWD_STR_LEN +
RAD_IDENTIFIER_LEN;
bcopy(encoded_chap_passwd,
req_attr->attr_value,
req_attr->attr_value_len);
}
len = req_attr->attr_value_len;
*length_ptr += len;
bcopy(req_attr->attr_value, ptr, req_attr->attr_value_len);
ptr += req_attr->attr_value_len;
total_length += len;
} /* Done looping over all attributes */
data_len = total_length;
total_length = htons(total_length);
bcopy(&total_length, packet->length, sizeof (ushort_t));
/*
* Send the packet to the RADIUS server.
*/
bzero((char *)&sa_rsvr, sizeof (sa_rsvr));
if (rsvr_ip_addr.i_insize == sizeof (in_addr_t)) {
int recv_len;
/* IPv4 */
sa_rsvr.s_in4.sin_family = AF_INET;
sa_rsvr.s_in4.sin_addr.s_addr =
rsvr_ip_addr.i_addr.in4.s_addr;
sa_rsvr.s_in4.sin_port = htons((ushort_t)rsvr_port);
iov[0].iov_base = (char *)data;
iov[0].iov_len = data_len;
bzero(&msg, sizeof (msg));
msg.msg_name = (struct sockaddr *)&sa_rsvr.s_in4;
msg.msg_namelen = sizeof (struct sockaddr_in);
msg.msg_iov = iov;
msg.msg_iovlen = 1;
recv_len = iscsi_net->sendmsg(socket, &msg);
kmem_free(data, MAX_RAD_PACKET_LEN);
return (recv_len == data_len ? 0 : -1);
} else if (rsvr_ip_addr.i_insize == sizeof (in6_addr_t)) {
/* No IPv6 support for now. */
return (-1);
} else {
/* Invalid IP address for RADIUS server. */
kmem_free(data, MAX_RAD_PACKET_LEN);
return (-1);
}
}
/*
* See radius_packet.h.
*/
int
rcv_radius_response(void *socket, uint8_t *shared_secret,
uint32_t shared_secret_len, uint8_t *req_authenticator,
radius_packet_data_t *resp_data)
{
int rcv_len = 0;
radius_packet_t *packet;
MD5_CTX context;
uint8_t *tmp_data;
uint8_t md5_digest[16]; /* MD5 Digest Length 16 */
uint16_t declared_len = 0;
ushort_t len;
struct nmsghdr msg;
struct iovec iov[1];
struct sonode *so = NULL;
int ret = 0;
tmp_data = kmem_zalloc(MAX_RAD_PACKET_LEN, KM_SLEEP);
iov[0].iov_base = (char *)tmp_data;
iov[0].iov_len = MAX_RAD_PACKET_LEN;
bzero(&msg, sizeof (msg));
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_control = NULL;
msg.msg_controllen = 0;
msg.msg_flags = MSG_WAITALL;
msg.msg_iov = iov;
msg.msg_iovlen = 1;
/*
* Convert the socket end point to a device stream. This can
* make our stream function kstrgetmsg() get the udp data
* during polling.
*/
so = (struct sonode *)socket;
(void) VOP_IOCTL(SOTOV(so), I_POP, 0, FKIOCTL, CRED(), &ret, NULL);
if (ret != 0) {
cmn_err(CE_NOTE, "iscsi convertion failed to change socket end"
"point to device stream");
kmem_free(tmp_data, MAX_RAD_PACKET_LEN);
return (RAD_RSP_RCVD_NO_DATA);
}
rcv_len = iscsi_net->recvmsg(socket, &msg, RAD_RCV_TIMEOUT);
if (rcv_len == 0) {
kmem_free(tmp_data, MAX_RAD_PACKET_LEN);
return (RAD_RSP_RCVD_NO_DATA);
}
DTRACE_PROBE1(rcv_rad_resp_summary, int, rcv_len);
packet = (radius_packet_t *)tmp_data;
bcopy(packet->length, &len, sizeof (ushort_t));
declared_len = ntohs(len);
DTRACE_PROBE1(rcv_rad_resp_data, uint16_t, declared_len);
/*
* Check if the received packet length is within allowable range.
* RFC 2865 section 3.
*/
if (rcv_len < MIN_RAD_PACKET_LEN) {
kmem_free(tmp_data, MAX_RAD_PACKET_LEN);
return (RAD_RSP_RCVD_PROTOCOL_ERR);
} else if (rcv_len > MAX_RAD_PACKET_LEN) {
kmem_free(tmp_data, MAX_RAD_PACKET_LEN);
return (RAD_RSP_RCVD_PROTOCOL_ERR);
}
/*
* Check if the declared packet length is within allowable range.
* RFC 2865 section 3.
*/
if (declared_len < MIN_RAD_PACKET_LEN) {
kmem_free(tmp_data, MAX_RAD_PACKET_LEN);
return (RAD_RSP_RCVD_PROTOCOL_ERR);
} else if (declared_len > MAX_RAD_PACKET_LEN) {
kmem_free(tmp_data, MAX_RAD_PACKET_LEN);
return (RAD_RSP_RCVD_PROTOCOL_ERR);
}
/*
* Discard packet with received length shorter than declared
* length. RFC 2865 section 3.
*/
if (rcv_len < declared_len) {
kmem_free(tmp_data, MAX_RAD_PACKET_LEN);
return (RAD_RSP_RCVD_PROTOCOL_ERR);
}
/*
* Authenticate the incoming packet, using the following algorithm
* (RFC 2865 section 3):
*
* MD5(Code+ID+Length+RequestAuth+Attributes+Secret)
*
* Code = RADIUS packet code
* ID = RADIUS packet identifier
* Length = Declared length of the packet
* RequestAuth = The request authenticator
* Attributes = The response attributes
* Secret = The shared secret
*/
MD5Init(&context);
bzero(&md5_digest, 16);
MD5Update(&context, &packet->code, 1);
MD5Update(&context, &packet->identifier, 1);
MD5Update(&context, packet->length, 2);
MD5Update(&context, req_authenticator, RAD_AUTHENTICATOR_LEN);
/* Include response attributes only if there is a payload */
if (declared_len > RAD_PACKET_HDR_LEN) {
/* Response Attributes */
MD5Update(&context, packet->data,
declared_len - RAD_PACKET_HDR_LEN);
}
MD5Update(&context, shared_secret, shared_secret_len);
MD5Final(md5_digest, &context);
if (bcmp(md5_digest, packet->authenticator, RAD_AUTHENTICATOR_LEN)
!= 0) {
kmem_free(tmp_data, MAX_RAD_PACKET_LEN);
return (RAD_RSP_RCVD_AUTH_FAILED);
}
/*
* If the received length is greater than the declared length,
* trust the declared length and shorten the packet (i.e., to
* treat the octets outside the range of the Length field as
* padding - RFC 2865 section 3).
*/
if (rcv_len > declared_len) {
/* Clear the padding data. */
bzero(tmp_data + declared_len, rcv_len - declared_len);
rcv_len = declared_len;
}
/*
* Annotate the RADIUS packet data with the data we received from
* the server.
*/
resp_data->code = packet->code;
resp_data->identifier = packet->identifier;
kmem_free(tmp_data, MAX_RAD_PACKET_LEN);
return (RAD_RSP_RCVD_SUCCESS);
}
/*
* encode_chap_password -
*
* Encode a CHAP-Password attribute. This function basically prepends
* the identifier in front of chap_passwd and copy the results to
* *result.
*/
static void
encode_chap_password(int identifier, int chap_passwd_len,
uint8_t *chap_passwd, uint8_t *result)
{
int i;
uint8_t *p;
uint8_t tmp_result[RAD_CHAP_PASSWD_STR_LEN +
RAD_IDENTIFIER_LEN + 1];
p = tmp_result;
*p = identifier; /* Identifier is 1 octet */
p++;
for (i = 0; i < chap_passwd_len; i++) {
*p = chap_passwd[i];
p++;
}
bcopy(tmp_result, result,
RAD_CHAP_PASSWD_STR_LEN + RAD_IDENTIFIER_LEN);
}