/*
* RADIUS message processing
* Copyright (c) 2002-2009, 2011-2015, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include "utils/common.h"
#include "utils/wpabuf.h"
#include "crypto/md5.h"
#include "crypto/crypto.h"
#include "radius.h"
/**
* struct radius_msg - RADIUS message structure for new and parsed messages
*/
struct radius_msg {
/**
* buf - Allocated buffer for RADIUS message
*/
struct wpabuf *buf;
/**
* hdr - Pointer to the RADIUS header in buf
*/
struct radius_hdr *hdr;
/**
* attr_pos - Array of indexes to attributes
*
* The values are number of bytes from buf to the beginning of
* struct radius_attr_hdr.
*/
size_t *attr_pos;
/**
* attr_size - Total size of the attribute pointer array
*/
size_t attr_size;
/**
* attr_used - Total number of attributes in the array
*/
size_t attr_used;
};
struct radius_hdr * radius_msg_get_hdr(struct radius_msg *msg)
{
return msg->hdr;
}
struct wpabuf * radius_msg_get_buf(struct radius_msg *msg)
{
return msg->buf;
}
static struct radius_attr_hdr *
radius_get_attr_hdr(struct radius_msg *msg, int idx)
{
return (struct radius_attr_hdr *)
(wpabuf_mhead_u8(msg->buf) + msg->attr_pos[idx]);
}
static void radius_msg_set_hdr(struct radius_msg *msg, u8 code, u8 identifier)
{
msg->hdr->code = code;
msg->hdr->identifier = identifier;
}
static int radius_msg_initialize(struct radius_msg *msg)
{
msg->attr_pos = os_calloc(RADIUS_DEFAULT_ATTR_COUNT,
sizeof(*msg->attr_pos));
if (msg->attr_pos == NULL)
return -1;
msg->attr_size = RADIUS_DEFAULT_ATTR_COUNT;
msg->attr_used = 0;
return 0;
}
/**
* radius_msg_new - Create a new RADIUS message
* @code: Code for RADIUS header
* @identifier: Identifier for RADIUS header
* Returns: Context for RADIUS message or %NULL on failure
*
* The caller is responsible for freeing the returned data with
* radius_msg_free().
*/
struct radius_msg * radius_msg_new(u8 code, u8 identifier)
{
struct radius_msg *msg;
msg = os_zalloc(sizeof(*msg));
if (msg == NULL)
return NULL;
msg->buf = wpabuf_alloc(RADIUS_DEFAULT_MSG_SIZE);
if (msg->buf == NULL || radius_msg_initialize(msg)) {
radius_msg_free(msg);
return NULL;
}
msg->hdr = wpabuf_put(msg->buf, sizeof(struct radius_hdr));
radius_msg_set_hdr(msg, code, identifier);
return msg;
}
/**
* radius_msg_free - Free a RADIUS message
* @msg: RADIUS message from radius_msg_new() or radius_msg_parse()
*/
void radius_msg_free(struct radius_msg *msg)
{
if (msg == NULL)
return;
wpabuf_free(msg->buf);
os_free(msg->attr_pos);
os_free(msg);
}
static const char *radius_code_string(u8 code)
{
switch (code) {
case RADIUS_CODE_ACCESS_REQUEST: return "Access-Request";
case RADIUS_CODE_ACCESS_ACCEPT: return "Access-Accept";
case RADIUS_CODE_ACCESS_REJECT: return "Access-Reject";
case RADIUS_CODE_ACCOUNTING_REQUEST: return "Accounting-Request";
case RADIUS_CODE_ACCOUNTING_RESPONSE: return "Accounting-Response";
case RADIUS_CODE_ACCESS_CHALLENGE: return "Access-Challenge";
case RADIUS_CODE_STATUS_SERVER: return "Status-Server";
case RADIUS_CODE_STATUS_CLIENT: return "Status-Client";
case RADIUS_CODE_RESERVED: return "Reserved";
case RADIUS_CODE_DISCONNECT_REQUEST: return "Disconnect-Request";
case RADIUS_CODE_DISCONNECT_ACK: return "Disconnect-ACK";
case RADIUS_CODE_DISCONNECT_NAK: return "Disconnect-NAK";
case RADIUS_CODE_COA_REQUEST: return "CoA-Request";
case RADIUS_CODE_COA_ACK: return "CoA-ACK";
case RADIUS_CODE_COA_NAK: return "CoA-NAK";
default: return "?Unknown?";
}
}
struct radius_attr_type {
u8 type;
char *name;
enum {
RADIUS_ATTR_UNDIST, RADIUS_ATTR_TEXT, RADIUS_ATTR_IP,
RADIUS_ATTR_HEXDUMP, RADIUS_ATTR_INT32, RADIUS_ATTR_IPV6
} data_type;
};
static const struct radius_attr_type radius_attrs[] =
{
{ RADIUS_ATTR_USER_NAME, "User-Name", RADIUS_ATTR_TEXT },
{ RADIUS_ATTR_USER_PASSWORD, "User-Password", RADIUS_ATTR_UNDIST },
{ RADIUS_ATTR_NAS_IP_ADDRESS, "NAS-IP-Address", RADIUS_ATTR_IP },
{ RADIUS_ATTR_NAS_PORT, "NAS-Port", RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_SERVICE_TYPE, "Service-Type", RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_FRAMED_IP_ADDRESS, "Framed-IP-Address", RADIUS_ATTR_IP },
{ RADIUS_ATTR_FRAMED_MTU, "Framed-MTU", RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_REPLY_MESSAGE, "Reply-Message", RADIUS_ATTR_TEXT },
{ RADIUS_ATTR_STATE, "State", RADIUS_ATTR_UNDIST },
{ RADIUS_ATTR_CLASS, "Class", RADIUS_ATTR_UNDIST },
{ RADIUS_ATTR_VENDOR_SPECIFIC, "Vendor-Specific", RADIUS_ATTR_UNDIST },
{ RADIUS_ATTR_SESSION_TIMEOUT, "Session-Timeout", RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_IDLE_TIMEOUT, "Idle-Timeout", RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_TERMINATION_ACTION, "Termination-Action",
RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_CALLED_STATION_ID, "Called-Station-Id",
RADIUS_ATTR_TEXT },
{ RADIUS_ATTR_CALLING_STATION_ID, "Calling-Station-Id",
RADIUS_ATTR_TEXT },
{ RADIUS_ATTR_NAS_IDENTIFIER, "NAS-Identifier", RADIUS_ATTR_TEXT },
{ RADIUS_ATTR_PROXY_STATE, "Proxy-State", RADIUS_ATTR_UNDIST },
{ RADIUS_ATTR_ACCT_STATUS_TYPE, "Acct-Status-Type",
RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_ACCT_DELAY_TIME, "Acct-Delay-Time", RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_ACCT_INPUT_OCTETS, "Acct-Input-Octets",
RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_ACCT_OUTPUT_OCTETS, "Acct-Output-Octets",
RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_ACCT_SESSION_ID, "Acct-Session-Id", RADIUS_ATTR_TEXT },
{ RADIUS_ATTR_ACCT_AUTHENTIC, "Acct-Authentic", RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_ACCT_SESSION_TIME, "Acct-Session-Time",
RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_ACCT_INPUT_PACKETS, "Acct-Input-Packets",
RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_ACCT_OUTPUT_PACKETS, "Acct-Output-Packets",
RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_ACCT_TERMINATE_CAUSE, "Acct-Terminate-Cause",
RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_ACCT_MULTI_SESSION_ID, "Acct-Multi-Session-Id",
RADIUS_ATTR_TEXT },
{ RADIUS_ATTR_ACCT_LINK_COUNT, "Acct-Link-Count", RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_ACCT_INPUT_GIGAWORDS, "Acct-Input-Gigawords",
RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_ACCT_OUTPUT_GIGAWORDS, "Acct-Output-Gigawords",
RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_EVENT_TIMESTAMP, "Event-Timestamp",
RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_EGRESS_VLANID, "EGRESS-VLANID", RADIUS_ATTR_HEXDUMP },
{ RADIUS_ATTR_NAS_PORT_TYPE, "NAS-Port-Type", RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_TUNNEL_TYPE, "Tunnel-Type", RADIUS_ATTR_HEXDUMP },
{ RADIUS_ATTR_TUNNEL_MEDIUM_TYPE, "Tunnel-Medium-Type",
RADIUS_ATTR_HEXDUMP },
{ RADIUS_ATTR_TUNNEL_PASSWORD, "Tunnel-Password",
RADIUS_ATTR_UNDIST },
{ RADIUS_ATTR_CONNECT_INFO, "Connect-Info", RADIUS_ATTR_TEXT },
{ RADIUS_ATTR_EAP_MESSAGE, "EAP-Message", RADIUS_ATTR_UNDIST },
{ RADIUS_ATTR_MESSAGE_AUTHENTICATOR, "Message-Authenticator",
RADIUS_ATTR_UNDIST },
{ RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID, "Tunnel-Private-Group-Id",
RADIUS_ATTR_HEXDUMP },
{ RADIUS_ATTR_ACCT_INTERIM_INTERVAL, "Acct-Interim-Interval",
RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_CHARGEABLE_USER_IDENTITY, "Chargeable-User-Identity",
RADIUS_ATTR_TEXT },
{ RADIUS_ATTR_NAS_IPV6_ADDRESS, "NAS-IPv6-Address", RADIUS_ATTR_IPV6 },
{ RADIUS_ATTR_ERROR_CAUSE, "Error-Cause", RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_EAP_KEY_NAME, "EAP-Key-Name", RADIUS_ATTR_HEXDUMP },
{ RADIUS_ATTR_OPERATOR_NAME, "Operator-Name", RADIUS_ATTR_TEXT },
{ RADIUS_ATTR_LOCATION_INFO, "Location-Information",
RADIUS_ATTR_HEXDUMP },
{ RADIUS_ATTR_LOCATION_DATA, "Location-Data", RADIUS_ATTR_HEXDUMP },
{ RADIUS_ATTR_BASIC_LOCATION_POLICY_RULES,
"Basic-Location-Policy-Rules", RADIUS_ATTR_HEXDUMP },
{ RADIUS_ATTR_EXTENDED_LOCATION_POLICY_RULES,
"Extended-Location-Policy-Rules", RADIUS_ATTR_HEXDUMP },
{ RADIUS_ATTR_LOCATION_CAPABLE, "Location-Capable", RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_REQUESTED_LOCATION_INFO, "Requested-Location-Info",
RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_MOBILITY_DOMAIN_ID, "Mobility-Domain-Id",
RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_WLAN_HESSID, "WLAN-HESSID", RADIUS_ATTR_TEXT },
{ RADIUS_ATTR_WLAN_REASON_CODE, "WLAN-Reason-Code",
RADIUS_ATTR_INT32 },
{ RADIUS_ATTR_WLAN_PAIRWISE_CIPHER, "WLAN-Pairwise-Cipher",
RADIUS_ATTR_HEXDUMP },
{ RADIUS_ATTR_WLAN_GROUP_CIPHER, "WLAN-Group-Cipher",
RADIUS_ATTR_HEXDUMP },
{ RADIUS_ATTR_WLAN_AKM_SUITE, "WLAN-AKM-Suite",
RADIUS_ATTR_HEXDUMP },
{ RADIUS_ATTR_WLAN_GROUP_MGMT_CIPHER, "WLAN-Group-Mgmt-Pairwise-Cipher",
RADIUS_ATTR_HEXDUMP },
};
#define RADIUS_ATTRS ARRAY_SIZE(radius_attrs)
static const struct radius_attr_type *radius_get_attr_type(u8 type)
{
size_t i;
for (i = 0; i < RADIUS_ATTRS; i++) {
if (type == radius_attrs[i].type)
return &radius_attrs[i];
}
return NULL;
}
static void radius_msg_dump_attr(struct radius_attr_hdr *hdr)
{
const struct radius_attr_type *attr;
int len;
unsigned char *pos;
char buf[1000];
attr = radius_get_attr_type(hdr->type);
wpa_printf(MSG_INFO, " Attribute %d (%s) length=%d",
hdr->type, attr ? attr->name : "?Unknown?", hdr->length);
if (attr == NULL || hdr->length < sizeof(struct radius_attr_hdr))
return;
len = hdr->length - sizeof(struct radius_attr_hdr);
pos = (unsigned char *) (hdr + 1);
switch (attr->data_type) {
case RADIUS_ATTR_TEXT:
printf_encode(buf, sizeof(buf), pos, len);
wpa_printf(MSG_INFO, " Value: '%s'", buf);
break;
case RADIUS_ATTR_IP:
if (len == 4) {
struct in_addr addr;
os_memcpy(&addr, pos, 4);
wpa_printf(MSG_INFO, " Value: %s",
inet_ntoa(addr));
} else {
wpa_printf(MSG_INFO, " Invalid IP address length %d",
len);
}
break;
#ifdef CONFIG_IPV6
case RADIUS_ATTR_IPV6:
if (len == 16) {
const char *atxt;
struct in6_addr *addr = (struct in6_addr *) pos;
atxt = inet_ntop(AF_INET6, addr, buf, sizeof(buf));
wpa_printf(MSG_INFO, " Value: %s",
atxt ? atxt : "?");
} else {
wpa_printf(MSG_INFO, " Invalid IPv6 address length %d",
len);
}
break;
#endif /* CONFIG_IPV6 */
case RADIUS_ATTR_HEXDUMP:
case RADIUS_ATTR_UNDIST:
wpa_snprintf_hex(buf, sizeof(buf), pos, len);
wpa_printf(MSG_INFO, " Value: %s", buf);
break;
case RADIUS_ATTR_INT32:
if (len == 4)
wpa_printf(MSG_INFO, " Value: %u",
WPA_GET_BE32(pos));
else
wpa_printf(MSG_INFO, " Invalid INT32 length %d",
len);
break;
default:
break;
}
}
void radius_msg_dump(struct radius_msg *msg)
{
size_t i;
wpa_printf(MSG_INFO, "RADIUS message: code=%d (%s) identifier=%d length=%d",
msg->hdr->code, radius_code_string(msg->hdr->code),
msg->hdr->identifier, be_to_host16(msg->hdr->length));
for (i = 0; i < msg->attr_used; i++) {
struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
radius_msg_dump_attr(attr);
}
}
int radius_msg_finish(struct radius_msg *msg, const u8 *secret,
size_t secret_len)
{
if (secret) {
u8 auth[MD5_MAC_LEN];
struct radius_attr_hdr *attr;
os_memset(auth, 0, MD5_MAC_LEN);
attr = radius_msg_add_attr(msg,
RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
auth, MD5_MAC_LEN);
if (attr == NULL) {
wpa_printf(MSG_WARNING, "RADIUS: Could not add "
"Message-Authenticator");
return -1;
}
msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
wpabuf_len(msg->buf), (u8 *) (attr + 1));
} else
msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
if (wpabuf_len(msg->buf) > 0xffff) {
wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
(unsigned long) wpabuf_len(msg->buf));
return -1;
}
return 0;
}
int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret,
size_t secret_len, const u8 *req_authenticator)
{
u8 auth[MD5_MAC_LEN];
struct radius_attr_hdr *attr;
const u8 *addr[4];
size_t len[4];
os_memset(auth, 0, MD5_MAC_LEN);
attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
auth, MD5_MAC_LEN);
if (attr == NULL) {
wpa_printf(MSG_ERROR, "WARNING: Could not add Message-Authenticator");
return -1;
}
msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
os_memcpy(msg->hdr->authenticator, req_authenticator,
sizeof(msg->hdr->authenticator));
hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
wpabuf_len(msg->buf), (u8 *) (attr + 1));
/* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
addr[0] = (u8 *) msg->hdr;
len[0] = 1 + 1 + 2;
addr[1] = req_authenticator;
len[1] = MD5_MAC_LEN;
addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
addr[3] = secret;
len[3] = secret_len;
md5_vector(4, addr, len, msg->hdr->authenticator);
if (wpabuf_len(msg->buf) > 0xffff) {
wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
(unsigned long) wpabuf_len(msg->buf));
return -1;
}
return 0;
}
int radius_msg_finish_das_resp(struct radius_msg *msg, const u8 *secret,
size_t secret_len,
const struct radius_hdr *req_hdr)
{
const u8 *addr[2];
size_t len[2];
u8 auth[MD5_MAC_LEN];
struct radius_attr_hdr *attr;
os_memset(auth, 0, MD5_MAC_LEN);
attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
auth, MD5_MAC_LEN);
if (attr == NULL) {
wpa_printf(MSG_WARNING, "Could not add Message-Authenticator");
return -1;
}
msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
os_memcpy(msg->hdr->authenticator, req_hdr->authenticator, 16);
hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
wpabuf_len(msg->buf), (u8 *) (attr + 1));
/* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
addr[0] = wpabuf_head_u8(msg->buf);
len[0] = wpabuf_len(msg->buf);
addr[1] = secret;
len[1] = secret_len;
if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0)
return -1;
if (wpabuf_len(msg->buf) > 0xffff) {
wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
(unsigned long) wpabuf_len(msg->buf));
return -1;
}
return 0;
}
void radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret,
size_t secret_len)
{
const u8 *addr[2];
size_t len[2];
msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN);
addr[0] = wpabuf_head(msg->buf);
len[0] = wpabuf_len(msg->buf);
addr[1] = secret;
len[1] = secret_len;
md5_vector(2, addr, len, msg->hdr->authenticator);
if (wpabuf_len(msg->buf) > 0xffff) {
wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
(unsigned long) wpabuf_len(msg->buf));
}
}
void radius_msg_finish_acct_resp(struct radius_msg *msg, const u8 *secret,
size_t secret_len, const u8 *req_authenticator)
{
const u8 *addr[2];
size_t len[2];
msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
os_memcpy(msg->hdr->authenticator, req_authenticator, MD5_MAC_LEN);
addr[0] = wpabuf_head(msg->buf);
len[0] = wpabuf_len(msg->buf);
addr[1] = secret;
len[1] = secret_len;
md5_vector(2, addr, len, msg->hdr->authenticator);
if (wpabuf_len(msg->buf) > 0xffff) {
wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
(unsigned long) wpabuf_len(msg->buf));
}
}
int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret,
size_t secret_len)
{
const u8 *addr[4];
size_t len[4];
u8 zero[MD5_MAC_LEN];
u8 hash[MD5_MAC_LEN];
os_memset(zero, 0, sizeof(zero));
addr[0] = (u8 *) msg->hdr;
len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
addr[1] = zero;
len[1] = MD5_MAC_LEN;
addr[2] = (u8 *) (msg->hdr + 1);
len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
addr[3] = secret;
len[3] = secret_len;
md5_vector(4, addr, len, hash);
return os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0;
}
int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret,
size_t secret_len,
int require_message_authenticator)
{
const u8 *addr[4];
size_t len[4];
u8 zero[MD5_MAC_LEN];
u8 hash[MD5_MAC_LEN];
u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
u8 orig_authenticator[16];
struct radius_attr_hdr *attr = NULL, *tmp;
size_t i;
os_memset(zero, 0, sizeof(zero));
addr[0] = (u8 *) msg->hdr;
len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
addr[1] = zero;
len[1] = MD5_MAC_LEN;
addr[2] = (u8 *) (msg->hdr + 1);
len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
addr[3] = secret;
len[3] = secret_len;
md5_vector(4, addr, len, hash);
if (os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0)
return 1;
for (i = 0; i < msg->attr_used; i++) {
tmp = radius_get_attr_hdr(msg, i);
if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
if (attr != NULL) {
wpa_printf(MSG_WARNING, "Multiple "
"Message-Authenticator attributes "
"in RADIUS message");
return 1;
}
attr = tmp;
}
}
if (attr == NULL) {
if (require_message_authenticator) {
wpa_printf(MSG_WARNING,
"Missing Message-Authenticator attribute in RADIUS message");
return 1;
}
return 0;
}
os_memcpy(orig, attr + 1, MD5_MAC_LEN);
os_memset(attr + 1, 0, MD5_MAC_LEN);
os_memcpy(orig_authenticator, msg->hdr->authenticator,
sizeof(orig_authenticator));
os_memset(msg->hdr->authenticator, 0,
sizeof(msg->hdr->authenticator));
hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
wpabuf_len(msg->buf), auth);
os_memcpy(attr + 1, orig, MD5_MAC_LEN);
os_memcpy(msg->hdr->authenticator, orig_authenticator,
sizeof(orig_authenticator));
return os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0;
}
static int radius_msg_add_attr_to_array(struct radius_msg *msg,
struct radius_attr_hdr *attr)
{
if (msg->attr_used >= msg->attr_size) {
size_t *nattr_pos;
int nlen = msg->attr_size * 2;
nattr_pos = os_realloc_array(msg->attr_pos, nlen,
sizeof(*msg->attr_pos));
if (nattr_pos == NULL)
return -1;
msg->attr_pos = nattr_pos;
msg->attr_size = nlen;
}
msg->attr_pos[msg->attr_used++] =
(unsigned char *) attr - wpabuf_head_u8(msg->buf);
return 0;
}
struct radius_attr_hdr *radius_msg_add_attr(struct radius_msg *msg, u8 type,
const u8 *data, size_t data_len)
{
size_t buf_needed;
struct radius_attr_hdr *attr;
if (TEST_FAIL())
return NULL;
if (data_len > RADIUS_MAX_ATTR_LEN) {
wpa_printf(MSG_ERROR, "radius_msg_add_attr: too long attribute (%lu bytes)",
(unsigned long) data_len);
return NULL;
}
buf_needed = sizeof(*attr) + data_len;
if (wpabuf_tailroom(msg->buf) < buf_needed) {
/* allocate more space for message buffer */
if (wpabuf_resize(&msg->buf, buf_needed) < 0)
return NULL;
msg->hdr = wpabuf_mhead(msg->buf);
}
attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr));
attr->type = type;
attr->length = sizeof(*attr) + data_len;
wpabuf_put_data(msg->buf, data, data_len);
if (radius_msg_add_attr_to_array(msg, attr))
return NULL;
return attr;
}
/**
* radius_msg_parse - Parse a RADIUS message
* @data: RADIUS message to be parsed
* @len: Length of data buffer in octets
* Returns: Parsed RADIUS message or %NULL on failure
*
* This parses a RADIUS message and makes a copy of its data. The caller is
* responsible for freeing the returned data with radius_msg_free().
*/
struct radius_msg * radius_msg_parse(const u8 *data, size_t len)
{
struct radius_msg *msg;
struct radius_hdr *hdr;
struct radius_attr_hdr *attr;
size_t msg_len;
unsigned char *pos, *end;
if (data == NULL || len < sizeof(*hdr))
return NULL;
hdr = (struct radius_hdr *) data;
msg_len = be_to_host16(hdr->length);
if (msg_len < sizeof(*hdr) || msg_len > len) {
wpa_printf(MSG_INFO, "RADIUS: Invalid message length");
return NULL;
}
if (msg_len < len) {
wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after "
"RADIUS message", (unsigned long) len - msg_len);
}
msg = os_zalloc(sizeof(*msg));
if (msg == NULL)
return NULL;
msg->buf = wpabuf_alloc_copy(data, msg_len);
if (msg->buf == NULL || radius_msg_initialize(msg)) {
radius_msg_free(msg);
return NULL;
}
msg->hdr = wpabuf_mhead(msg->buf);
/* parse attributes */
pos = wpabuf_mhead_u8(msg->buf) + sizeof(struct radius_hdr);
end = wpabuf_mhead_u8(msg->buf) + wpabuf_len(msg->buf);
while (pos < end) {
if ((size_t) (end - pos) < sizeof(*attr))
goto fail;
attr = (struct radius_attr_hdr *) pos;
if (attr->length > end - pos || attr->length < sizeof(*attr))
goto fail;
/* TODO: check that attr->length is suitable for attr->type */
if (radius_msg_add_attr_to_array(msg, attr))
goto fail;
pos += attr->length;
}
return msg;
fail:
radius_msg_free(msg);
return NULL;
}
int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len)
{
const u8 *pos = data;
size_t left = data_len;
while (left > 0) {
int len;
if (left > RADIUS_MAX_ATTR_LEN)
len = RADIUS_MAX_ATTR_LEN;
else
len = left;
if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE,
pos, len))
return 0;
pos += len;
left -= len;
}
return 1;
}
struct wpabuf * radius_msg_get_eap(struct radius_msg *msg)
{
struct wpabuf *eap;
size_t len, i;
struct radius_attr_hdr *attr;
if (msg == NULL)
return NULL;
len = 0;
for (i = 0; i < msg->attr_used; i++) {
attr = radius_get_attr_hdr(msg, i);
if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
attr->length > sizeof(struct radius_attr_hdr))
len += attr->length - sizeof(struct radius_attr_hdr);
}
if (len == 0)
return NULL;
eap = wpabuf_alloc(len);
if (eap == NULL)
return NULL;
for (i = 0; i < msg->attr_used; i++) {
attr = radius_get_attr_hdr(msg, i);
if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
attr->length > sizeof(struct radius_attr_hdr)) {
int flen = attr->length - sizeof(*attr);
wpabuf_put_data(eap, attr + 1, flen);
}
}
return eap;
}
int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret,
size_t secret_len, const u8 *req_auth)
{
u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
u8 orig_authenticator[16];
struct radius_attr_hdr *attr = NULL, *tmp;
size_t i;
for (i = 0; i < msg->attr_used; i++) {
tmp = radius_get_attr_hdr(msg, i);
if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
if (attr != NULL) {
wpa_printf(MSG_INFO, "Multiple Message-Authenticator attributes in RADIUS message");
return 1;
}
attr = tmp;
}
}
if (attr == NULL) {
wpa_printf(MSG_INFO, "No Message-Authenticator attribute found");
return 1;
}
os_memcpy(orig, attr + 1, MD5_MAC_LEN);
os_memset(attr + 1, 0, MD5_MAC_LEN);
if (req_auth) {
os_memcpy(orig_authenticator, msg->hdr->authenticator,
sizeof(orig_authenticator));
os_memcpy(msg->hdr->authenticator, req_auth,
sizeof(msg->hdr->authenticator));
}
if (hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
wpabuf_len(msg->buf), auth) < 0)
return 1;
os_memcpy(attr + 1, orig, MD5_MAC_LEN);
if (req_auth) {
os_memcpy(msg->hdr->authenticator, orig_authenticator,
sizeof(orig_authenticator));
}
if (os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0) {
wpa_printf(MSG_INFO, "Invalid Message-Authenticator!");
return 1;
}
return 0;
}
int radius_msg_verify(struct radius_msg *msg, const u8 *secret,
size_t secret_len, struct radius_msg *sent_msg, int auth)
{
const u8 *addr[4];
size_t len[4];
u8 hash[MD5_MAC_LEN];
if (sent_msg == NULL) {
wpa_printf(MSG_INFO, "No matching Access-Request message found");
return 1;
}
if (auth &&
radius_msg_verify_msg_auth(msg, secret, secret_len,
sent_msg->hdr->authenticator)) {
return 1;
}
/* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
addr[0] = (u8 *) msg->hdr;
len[0] = 1 + 1 + 2;
addr[1] = sent_msg->hdr->authenticator;
len[1] = MD5_MAC_LEN;
addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
addr[3] = secret;
len[3] = secret_len;
if (md5_vector(4, addr, len, hash) < 0 ||
os_memcmp_const(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) {
wpa_printf(MSG_INFO, "Response Authenticator invalid!");
return 1;
}
return 0;
}
int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src,
u8 type)
{
struct radius_attr_hdr *attr;
size_t i;
int count = 0;
for (i = 0; i < src->attr_used; i++) {
attr = radius_get_attr_hdr(src, i);
if (attr->type == type && attr->length >= sizeof(*attr)) {
if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1),
attr->length - sizeof(*attr)))
return -1;
count++;
}
}
return count;
}
/* Create Request Authenticator. The value should be unique over the lifetime
* of the shared secret between authenticator and authentication server.
*/
int radius_msg_make_authenticator(struct radius_msg *msg)
{
return os_get_random((u8 *) &msg->hdr->authenticator,
sizeof(msg->hdr->authenticator));
}
/* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message.
* Returns the Attribute payload and sets alen to indicate the length of the
* payload if a vendor attribute with subtype is found, otherwise returns NULL.
* The returned payload is allocated with os_malloc() and caller must free it
* by calling os_free().
*/
static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor,
u8 subtype, size_t *alen)
{
u8 *data, *pos;
size_t i, len;
if (msg == NULL)
return NULL;
for (i = 0; i < msg->attr_used; i++) {
struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
size_t left;
u32 vendor_id;
struct radius_attr_vendor *vhdr;
if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC ||
attr->length < sizeof(*attr))
continue;
left = attr->length - sizeof(*attr);
if (left < 4)
continue;
pos = (u8 *) (attr + 1);
os_memcpy(&vendor_id, pos, 4);
pos += 4;
left -= 4;
if (ntohl(vendor_id) != vendor)
continue;
while (left >= sizeof(*vhdr)) {
vhdr = (struct radius_attr_vendor *) pos;
if (vhdr->vendor_length > left ||
vhdr->vendor_length < sizeof(*vhdr)) {
break;
}
if (vhdr->vendor_type != subtype) {
pos += vhdr->vendor_length;
left -= vhdr->vendor_length;
continue;
}
len = vhdr->vendor_length - sizeof(*vhdr);
data = os_memdup(pos + sizeof(*vhdr), len);
if (data == NULL)
return NULL;
if (alen)
*alen = len;
return data;
}
}
return NULL;
}
static u8 * decrypt_ms_key(const u8 *key, size_t len,
const u8 *req_authenticator,
const u8 *secret, size_t secret_len, size_t *reslen)
{
u8 *plain, *ppos, *res;
const u8 *pos;
size_t left, plen;
u8 hash[MD5_MAC_LEN];
int i, first = 1;
const u8 *addr[3];
size_t elen[3];
/* key: 16-bit salt followed by encrypted key info */
if (len < 2 + 16) {
wpa_printf(MSG_DEBUG, "RADIUS: %s: Len is too small: %d",
__func__, (int) len);
return NULL;
}
pos = key + 2;
left = len - 2;
if (left % 16) {
wpa_printf(MSG_INFO, "RADIUS: Invalid ms key len %lu",
(unsigned long) left);
return NULL;
}
plen = left;
ppos = plain = os_malloc(plen);
if (plain == NULL)
return NULL;
plain[0] = 0;
while (left > 0) {
/* b(1) = MD5(Secret + Request-Authenticator + Salt)
* b(i) = MD5(Secret + c(i - 1)) for i > 1 */
addr[0] = secret;
elen[0] = secret_len;
if (first) {
addr[1] = req_authenticator;
elen[1] = MD5_MAC_LEN;
addr[2] = key;
elen[2] = 2; /* Salt */
} else {
addr[1] = pos - MD5_MAC_LEN;
elen[1] = MD5_MAC_LEN;
}
if (md5_vector(first ? 3 : 2, addr, elen, hash) < 0) {
os_free(plain);
return NULL;
}
first = 0;
for (i = 0; i < MD5_MAC_LEN; i++)
*ppos++ = *pos++ ^ hash[i];
left -= MD5_MAC_LEN;
}
if (plain[0] == 0 || plain[0] > plen - 1) {
wpa_printf(MSG_INFO, "RADIUS: Failed to decrypt MPPE key");
os_free(plain);
return NULL;
}
res = os_memdup(plain + 1, plain[0]);
if (res == NULL) {
os_free(plain);
return NULL;
}
if (reslen)
*reslen = plain[0];
os_free(plain);
return res;
}
static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt,
const u8 *req_authenticator,
const u8 *secret, size_t secret_len,
u8 *ebuf, size_t *elen)
{
int i, len, first = 1;
u8 hash[MD5_MAC_LEN], saltbuf[2], *pos;
const u8 *addr[3];
size_t _len[3];
WPA_PUT_BE16(saltbuf, salt);
len = 1 + key_len;
if (len & 0x0f) {
len = (len & 0xf0) + 16;
}
os_memset(ebuf, 0, len);
ebuf[0] = key_len;
os_memcpy(ebuf + 1, key, key_len);
*elen = len;
pos = ebuf;
while (len > 0) {
/* b(1) = MD5(Secret + Request-Authenticator + Salt)
* b(i) = MD5(Secret + c(i - 1)) for i > 1 */
addr[0] = secret;
_len[0] = secret_len;
if (first) {
addr[1] = req_authenticator;
_len[1] = MD5_MAC_LEN;
addr[2] = saltbuf;
_len[2] = sizeof(saltbuf);
} else {
addr[1] = pos - MD5_MAC_LEN;
_len[1] = MD5_MAC_LEN;
}
md5_vector(first ? 3 : 2, addr, _len, hash);
first = 0;
for (i = 0; i < MD5_MAC_LEN; i++)
*pos++ ^= hash[i];
len -= MD5_MAC_LEN;
}
}
struct radius_ms_mppe_keys *
radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
const u8 *secret, size_t secret_len)
{
u8 *key;
size_t keylen;
struct radius_ms_mppe_keys *keys;
if (msg == NULL || sent_msg == NULL)
return NULL;
keys = os_zalloc(sizeof(*keys));
if (keys == NULL)
return NULL;
key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY,
&keylen);
if (key) {
keys->send = decrypt_ms_key(key, keylen,
sent_msg->hdr->authenticator,
secret, secret_len,
&keys->send_len);
if (!keys->send) {
wpa_printf(MSG_DEBUG,
"RADIUS: Failed to decrypt send key");
}
os_free(key);
}
key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY,
&keylen);
if (key) {
keys->recv = decrypt_ms_key(key, keylen,
sent_msg->hdr->authenticator,
secret, secret_len,
&keys->recv_len);
if (!keys->recv) {
wpa_printf(MSG_DEBUG,
"RADIUS: Failed to decrypt recv key");
}
os_free(key);
}
return keys;
}
struct radius_ms_mppe_keys *
radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
const u8 *secret, size_t secret_len)
{
u8 *key;
size_t keylen;
struct radius_ms_mppe_keys *keys;
if (msg == NULL || sent_msg == NULL)
return NULL;
keys = os_zalloc(sizeof(*keys));
if (keys == NULL)
return NULL;
key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO,
RADIUS_CISCO_AV_PAIR, &keylen);
if (key && keylen == 51 &&
os_memcmp(key, "leap:session-key=", 17) == 0) {
keys->recv = decrypt_ms_key(key + 17, keylen - 17,
sent_msg->hdr->authenticator,
secret, secret_len,
&keys->recv_len);
}
os_free(key);
return keys;
}
int radius_msg_add_mppe_keys(struct radius_msg *msg,
const u8 *req_authenticator,
const u8 *secret, size_t secret_len,
const u8 *send_key, size_t send_key_len,
const u8 *recv_key, size_t recv_key_len)
{
struct radius_attr_hdr *attr;
u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT);
u8 *buf;
struct radius_attr_vendor *vhdr;
u8 *pos;
size_t elen;
int hlen;
u16 salt;
hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2;
/* MS-MPPE-Send-Key */
buf = os_malloc(hlen + send_key_len + 16);
if (buf == NULL) {
return 0;
}
pos = buf;
os_memcpy(pos, &vendor_id, sizeof(vendor_id));
pos += sizeof(vendor_id);
vhdr = (struct radius_attr_vendor *) pos;
vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY;
pos = (u8 *) (vhdr + 1);
if (os_get_random((u8 *) &salt, sizeof(salt)) < 0) {
os_free(buf);
return 0;
}
salt |= 0x8000;
WPA_PUT_BE16(pos, salt);
pos += 2;
encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret,
secret_len, pos, &elen);
vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
buf, hlen + elen);
os_free(buf);
if (attr == NULL) {
return 0;
}
/* MS-MPPE-Recv-Key */
buf = os_malloc(hlen + recv_key_len + 16);
if (buf == NULL) {
return 0;
}
pos = buf;
os_memcpy(pos, &vendor_id, sizeof(vendor_id));
pos += sizeof(vendor_id);
vhdr = (struct radius_attr_vendor *) pos;
vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY;
pos = (u8 *) (vhdr + 1);
salt ^= 1;
WPA_PUT_BE16(pos, salt);
pos += 2;
encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret,
secret_len, pos, &elen);
vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
buf, hlen + elen);
os_free(buf);
if (attr == NULL) {
return 0;
}
return 1;
}
int radius_msg_add_wfa(struct radius_msg *msg, u8 subtype, const u8 *data,
size_t len)
{
struct radius_attr_hdr *attr;
u8 *buf, *pos;
size_t alen;
alen = 4 + 2 + len;
buf = os_malloc(alen);
if (buf == NULL)
return 0;
pos = buf;
WPA_PUT_BE32(pos, RADIUS_VENDOR_ID_WFA);
pos += 4;
*pos++ = subtype;
*pos++ = 2 + len;
os_memcpy(pos, data, len);
attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
buf, alen);
os_free(buf);
if (attr == NULL)
return 0;
return 1;
}
int radius_user_password_hide(struct radius_msg *msg,
const u8 *data, size_t data_len,
const u8 *secret, size_t secret_len,
u8 *buf, size_t buf_len)
{
size_t padlen, i, pos;
const u8 *addr[2];
size_t len[2];
u8 hash[16];
if (data_len + 16 > buf_len)
return -1;
os_memcpy(buf, data, data_len);
padlen = data_len % 16;
if (padlen && data_len < buf_len) {
padlen = 16 - padlen;
os_memset(buf + data_len, 0, padlen);
buf_len = data_len + padlen;
} else {
buf_len = data_len;
}
addr[0] = secret;
len[0] = secret_len;
addr[1] = msg->hdr->authenticator;
len[1] = 16;
md5_vector(2, addr, len, hash);
for (i = 0; i < 16; i++)
buf[i] ^= hash[i];
pos = 16;
while (pos < buf_len) {
addr[0] = secret;
len[0] = secret_len;
addr[1] = &buf[pos - 16];
len[1] = 16;
md5_vector(2, addr, len, hash);
for (i = 0; i < 16; i++)
buf[pos + i] ^= hash[i];
pos += 16;
}
return buf_len;
}
/* Add User-Password attribute to a RADIUS message and encrypt it as specified
* in RFC 2865, Chap. 5.2 */
struct radius_attr_hdr *
radius_msg_add_attr_user_password(struct radius_msg *msg,
const u8 *data, size_t data_len,
const u8 *secret, size_t secret_len)
{
u8 buf[128];
int res;
res = radius_user_password_hide(msg, data, data_len,
secret, secret_len, buf, sizeof(buf));
if (res < 0)
return NULL;
return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD,
buf, res);
}
int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len)
{
struct radius_attr_hdr *attr = NULL, *tmp;
size_t i, dlen;
for (i = 0; i < msg->attr_used; i++) {
tmp = radius_get_attr_hdr(msg, i);
if (tmp->type == type) {
attr = tmp;
break;
}
}
if (!attr || attr->length < sizeof(*attr))
return -1;
dlen = attr->length - sizeof(*attr);
if (buf)
os_memcpy(buf, (attr + 1), dlen > len ? len : dlen);
return dlen;
}
int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf,
size_t *len, const u8 *start)
{
size_t i;
struct radius_attr_hdr *attr = NULL, *tmp;
for (i = 0; i < msg->attr_used; i++) {
tmp = radius_get_attr_hdr(msg, i);
if (tmp->type == type &&
(start == NULL || (u8 *) tmp > start)) {
attr = tmp;
break;
}
}
if (!attr || attr->length < sizeof(*attr))
return -1;
*buf = (u8 *) (attr + 1);
*len = attr->length - sizeof(*attr);
return 0;
}
int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len)
{
size_t i;
int count;
for (count = 0, i = 0; i < msg->attr_used; i++) {
struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
if (attr->type == type &&
attr->length >= sizeof(struct radius_attr_hdr) + min_len)
count++;
}
return count;
}
struct radius_tunnel_attrs {
int tag_used;
int type; /* Tunnel-Type */
int medium_type; /* Tunnel-Medium-Type */
int vlanid;
};
static int cmp_int(const void *a, const void *b)
{
int x, y;
x = *((int *) a);
y = *((int *) b);
return (x - y);
}
/**
* radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information
* The k tagged vlans found are sorted by vlan_id and stored in the first k
* items of tagged.
*
* @msg: RADIUS message
* @untagged: Pointer to store untagged vid
* @numtagged: Size of tagged
* @tagged: Pointer to store tagged list
*
* Returns: 0 if neither tagged nor untagged configuration is found, 1 otherwise
*/
int radius_msg_get_vlanid(struct radius_msg *msg, int *untagged, int numtagged,
int *tagged)
{
struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun;
size_t i;
struct radius_attr_hdr *attr = NULL;
const u8 *data;
char buf[10];
size_t dlen;
int j, taggedidx = 0, vlan_id;
os_memset(&tunnel, 0, sizeof(tunnel));
for (j = 0; j < numtagged; j++)
tagged[j] = 0;
*untagged = 0;
for (i = 0; i < msg->attr_used; i++) {
attr = radius_get_attr_hdr(msg, i);
if (attr->length < sizeof(*attr))
return -1;
data = (const u8 *) (attr + 1);
dlen = attr->length - sizeof(*attr);
if (attr->length < 3)
continue;
if (data[0] >= RADIUS_TUNNEL_TAGS)
tun = &tunnel[0];
else
tun = &tunnel[data[0]];
switch (attr->type) {
case RADIUS_ATTR_TUNNEL_TYPE:
if (attr->length != 6)
break;
tun->tag_used++;
tun->type = WPA_GET_BE24(data + 1);
break;
case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE:
if (attr->length != 6)
break;
tun->tag_used++;
tun->medium_type = WPA_GET_BE24(data + 1);
break;
case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID:
if (data[0] < RADIUS_TUNNEL_TAGS) {
data++;
dlen--;
}
if (dlen >= sizeof(buf))
break;
os_memcpy(buf, data, dlen);
buf[dlen] = '\0';
vlan_id = atoi(buf);
if (vlan_id <= 0)
break;
tun->tag_used++;
tun->vlanid = vlan_id;
break;
case RADIUS_ATTR_EGRESS_VLANID: /* RFC 4675 */
if (attr->length != 6)
break;
vlan_id = WPA_GET_BE24(data + 1);
if (vlan_id <= 0)
break;
if (data[0] == 0x32)
*untagged = vlan_id;
else if (data[0] == 0x31 && tagged &&
taggedidx < numtagged)
tagged[taggedidx++] = vlan_id;
break;
}
}
/* Use tunnel with the lowest tag for untagged VLAN id */
for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) {
tun = &tunnel[i];
if (tun->tag_used &&
tun->type == RADIUS_TUNNEL_TYPE_VLAN &&
tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 &&
tun->vlanid > 0) {
*untagged = tun->vlanid;
break;
}
}
if (taggedidx)
qsort(tagged, taggedidx, sizeof(int), cmp_int);
if (*untagged > 0 || taggedidx)
return 1;
return 0;
}
/**
* radius_msg_get_tunnel_password - Parse RADIUS attribute Tunnel-Password
* @msg: Received RADIUS message
* @keylen: Length of returned password
* @secret: RADIUS shared secret
* @secret_len: Length of secret
* @sent_msg: Sent RADIUS message
* @n: Number of password attribute to return (starting with 0)
* Returns: Pointer to n-th password (free with os_free) or %NULL
*/
char * radius_msg_get_tunnel_password(struct radius_msg *msg, int *keylen,
const u8 *secret, size_t secret_len,
struct radius_msg *sent_msg, size_t n)
{
u8 *buf = NULL;
size_t buflen;
const u8 *salt;
u8 *str;
const u8 *addr[3];
size_t len[3];
u8 hash[16];
u8 *pos;
size_t i, j = 0;
struct radius_attr_hdr *attr;
const u8 *data;
size_t dlen;
const u8 *fdata = NULL; /* points to found item */
size_t fdlen = -1;
char *ret = NULL;
/* find n-th valid Tunnel-Password attribute */
for (i = 0; i < msg->attr_used; i++) {
attr = radius_get_attr_hdr(msg, i);
if (attr == NULL ||
attr->type != RADIUS_ATTR_TUNNEL_PASSWORD) {
continue;
}
if (attr->length <= 5)
continue;
data = (const u8 *) (attr + 1);
dlen = attr->length - sizeof(*attr);
if (dlen <= 3 || dlen % 16 != 3)
continue;
j++;
if (j <= n)
continue;
fdata = data;
fdlen = dlen;
break;
}
if (fdata == NULL)
goto out;
/* alloc writable memory for decryption */
buf = os_memdup(fdata, fdlen);
if (buf == NULL)
goto out;
buflen = fdlen;
/* init pointers */
salt = buf + 1;
str = buf + 3;
/* decrypt blocks */
pos = buf + buflen - 16; /* last block */
while (pos >= str + 16) { /* all but the first block */
addr[0] = secret;
len[0] = secret_len;
addr[1] = pos - 16;
len[1] = 16;
md5_vector(2, addr, len, hash);
for (i = 0; i < 16; i++)
pos[i] ^= hash[i];
pos -= 16;
}
/* decrypt first block */
if (str != pos)
goto out;
addr[0] = secret;
len[0] = secret_len;
addr[1] = sent_msg->hdr->authenticator;
len[1] = 16;
addr[2] = salt;
len[2] = 2;
md5_vector(3, addr, len, hash);
for (i = 0; i < 16; i++)
pos[i] ^= hash[i];
/* derive plaintext length from first subfield */
*keylen = (unsigned char) str[0];
if ((u8 *) (str + *keylen) >= (u8 *) (buf + buflen)) {
/* decryption error - invalid key length */
goto out;
}
if (*keylen == 0) {
/* empty password */
goto out;
}
/* copy passphrase into new buffer */
ret = os_malloc(*keylen);
if (ret)
os_memcpy(ret, str + 1, *keylen);
out:
/* return new buffer */
os_free(buf);
return ret;
}
void radius_free_class(struct radius_class_data *c)
{
size_t i;
if (c == NULL)
return;
for (i = 0; i < c->count; i++)
os_free(c->attr[i].data);
os_free(c->attr);
c->attr = NULL;
c->count = 0;
}
int radius_copy_class(struct radius_class_data *dst,
const struct radius_class_data *src)
{
size_t i;
if (src->attr == NULL)
return 0;
dst->attr = os_calloc(src->count, sizeof(struct radius_attr_data));
if (dst->attr == NULL)
return -1;
dst->count = 0;
for (i = 0; i < src->count; i++) {
dst->attr[i].data = os_memdup(src->attr[i].data,
src->attr[i].len);
if (dst->attr[i].data == NULL)
break;
dst->count++;
dst->attr[i].len = src->attr[i].len;
}
return 0;
}
u8 radius_msg_find_unlisted_attr(struct radius_msg *msg, u8 *attrs)
{
size_t i, j;
struct radius_attr_hdr *attr;
for (i = 0; i < msg->attr_used; i++) {
attr = radius_get_attr_hdr(msg, i);
for (j = 0; attrs[j]; j++) {
if (attr->type == attrs[j])
break;
}
if (attrs[j] == 0)
return attr->type; /* unlisted attr */
}
return 0;
}
int radius_gen_session_id(u8 *id, size_t len)
{
/*
* Acct-Session-Id and Acct-Multi-Session-Id should be globally and
* temporarily unique. A high quality random number is required
* therefore. This could be be improved by switching to a GUID.
*/
return os_get_random(id, len);
}