2 * RADIUS message processing
3 * Copyright (c) 2002-2009, 2011-2014, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
9 #include "utils/includes.h"
11 #include "utils/common.h"
12 #include "utils/wpabuf.h"
13 #include "crypto/md5.h"
14 #include "crypto/crypto.h"
19 * struct radius_msg - RADIUS message structure for new and parsed messages
23 * buf - Allocated buffer for RADIUS message
28 * hdr - Pointer to the RADIUS header in buf
30 struct radius_hdr *hdr;
33 * attr_pos - Array of indexes to attributes
35 * The values are number of bytes from buf to the beginning of
36 * struct radius_attr_hdr.
41 * attr_size - Total size of the attribute pointer array
46 * attr_used - Total number of attributes in the array
52 struct radius_hdr * radius_msg_get_hdr(struct radius_msg *msg)
58 struct wpabuf * radius_msg_get_buf(struct radius_msg *msg)
64 static struct radius_attr_hdr *
65 radius_get_attr_hdr(struct radius_msg *msg, int idx)
67 return (struct radius_attr_hdr *)
68 (wpabuf_mhead_u8(msg->buf) + msg->attr_pos[idx]);
72 static void radius_msg_set_hdr(struct radius_msg *msg, u8 code, u8 identifier)
74 msg->hdr->code = code;
75 msg->hdr->identifier = identifier;
79 static int radius_msg_initialize(struct radius_msg *msg)
81 msg->attr_pos = os_calloc(RADIUS_DEFAULT_ATTR_COUNT,
82 sizeof(*msg->attr_pos));
83 if (msg->attr_pos == NULL)
86 msg->attr_size = RADIUS_DEFAULT_ATTR_COUNT;
94 * radius_msg_new - Create a new RADIUS message
95 * @code: Code for RADIUS header
96 * @identifier: Identifier for RADIUS header
97 * Returns: Context for RADIUS message or %NULL on failure
99 * The caller is responsible for freeing the returned data with
102 struct radius_msg * radius_msg_new(u8 code, u8 identifier)
104 struct radius_msg *msg;
106 msg = os_zalloc(sizeof(*msg));
110 msg->buf = wpabuf_alloc(RADIUS_DEFAULT_MSG_SIZE);
111 if (msg->buf == NULL || radius_msg_initialize(msg)) {
112 radius_msg_free(msg);
115 msg->hdr = wpabuf_put(msg->buf, sizeof(struct radius_hdr));
117 radius_msg_set_hdr(msg, code, identifier);
124 * radius_msg_free - Free a RADIUS message
125 * @msg: RADIUS message from radius_msg_new() or radius_msg_parse()
127 void radius_msg_free(struct radius_msg *msg)
132 wpabuf_free(msg->buf);
133 os_free(msg->attr_pos);
138 static const char *radius_code_string(u8 code)
141 case RADIUS_CODE_ACCESS_REQUEST: return "Access-Request";
142 case RADIUS_CODE_ACCESS_ACCEPT: return "Access-Accept";
143 case RADIUS_CODE_ACCESS_REJECT: return "Access-Reject";
144 case RADIUS_CODE_ACCOUNTING_REQUEST: return "Accounting-Request";
145 case RADIUS_CODE_ACCOUNTING_RESPONSE: return "Accounting-Response";
146 case RADIUS_CODE_ACCESS_CHALLENGE: return "Access-Challenge";
147 case RADIUS_CODE_STATUS_SERVER: return "Status-Server";
148 case RADIUS_CODE_STATUS_CLIENT: return "Status-Client";
149 case RADIUS_CODE_RESERVED: return "Reserved";
150 case RADIUS_CODE_DISCONNECT_REQUEST: return "Disconnect-Request";
151 case RADIUS_CODE_DISCONNECT_ACK: return "Disconnect-ACK";
152 case RADIUS_CODE_DISCONNECT_NAK: return "Disconnect-NAK";
153 case RADIUS_CODE_COA_REQUEST: return "CoA-Request";
154 case RADIUS_CODE_COA_ACK: return "CoA-ACK";
155 case RADIUS_CODE_COA_NAK: return "CoA-NAK";
156 default: return "?Unknown?";
161 struct radius_attr_type {
165 RADIUS_ATTR_UNDIST, RADIUS_ATTR_TEXT, RADIUS_ATTR_IP,
166 RADIUS_ATTR_HEXDUMP, RADIUS_ATTR_INT32, RADIUS_ATTR_IPV6
170 static struct radius_attr_type radius_attrs[] =
172 { RADIUS_ATTR_USER_NAME, "User-Name", RADIUS_ATTR_TEXT },
173 { RADIUS_ATTR_USER_PASSWORD, "User-Password", RADIUS_ATTR_UNDIST },
174 { RADIUS_ATTR_NAS_IP_ADDRESS, "NAS-IP-Address", RADIUS_ATTR_IP },
175 { RADIUS_ATTR_NAS_PORT, "NAS-Port", RADIUS_ATTR_INT32 },
176 { RADIUS_ATTR_FRAMED_MTU, "Framed-MTU", RADIUS_ATTR_INT32 },
177 { RADIUS_ATTR_REPLY_MESSAGE, "Reply-Message", RADIUS_ATTR_TEXT },
178 { RADIUS_ATTR_STATE, "State", RADIUS_ATTR_UNDIST },
179 { RADIUS_ATTR_CLASS, "Class", RADIUS_ATTR_UNDIST },
180 { RADIUS_ATTR_VENDOR_SPECIFIC, "Vendor-Specific", RADIUS_ATTR_UNDIST },
181 { RADIUS_ATTR_SESSION_TIMEOUT, "Session-Timeout", RADIUS_ATTR_INT32 },
182 { RADIUS_ATTR_IDLE_TIMEOUT, "Idle-Timeout", RADIUS_ATTR_INT32 },
183 { RADIUS_ATTR_TERMINATION_ACTION, "Termination-Action",
185 { RADIUS_ATTR_CALLED_STATION_ID, "Called-Station-Id",
187 { RADIUS_ATTR_CALLING_STATION_ID, "Calling-Station-Id",
189 { RADIUS_ATTR_NAS_IDENTIFIER, "NAS-Identifier", RADIUS_ATTR_TEXT },
190 { RADIUS_ATTR_PROXY_STATE, "Proxy-State", RADIUS_ATTR_UNDIST },
191 { RADIUS_ATTR_ACCT_STATUS_TYPE, "Acct-Status-Type",
193 { RADIUS_ATTR_ACCT_DELAY_TIME, "Acct-Delay-Time", RADIUS_ATTR_INT32 },
194 { RADIUS_ATTR_ACCT_INPUT_OCTETS, "Acct-Input-Octets",
196 { RADIUS_ATTR_ACCT_OUTPUT_OCTETS, "Acct-Output-Octets",
198 { RADIUS_ATTR_ACCT_SESSION_ID, "Acct-Session-Id", RADIUS_ATTR_TEXT },
199 { RADIUS_ATTR_ACCT_AUTHENTIC, "Acct-Authentic", RADIUS_ATTR_INT32 },
200 { RADIUS_ATTR_ACCT_SESSION_TIME, "Acct-Session-Time",
202 { RADIUS_ATTR_ACCT_INPUT_PACKETS, "Acct-Input-Packets",
204 { RADIUS_ATTR_ACCT_OUTPUT_PACKETS, "Acct-Output-Packets",
206 { RADIUS_ATTR_ACCT_TERMINATE_CAUSE, "Acct-Terminate-Cause",
208 { RADIUS_ATTR_ACCT_MULTI_SESSION_ID, "Acct-Multi-Session-Id",
210 { RADIUS_ATTR_ACCT_LINK_COUNT, "Acct-Link-Count", RADIUS_ATTR_INT32 },
211 { RADIUS_ATTR_ACCT_INPUT_GIGAWORDS, "Acct-Input-Gigawords",
213 { RADIUS_ATTR_ACCT_OUTPUT_GIGAWORDS, "Acct-Output-Gigawords",
215 { RADIUS_ATTR_EVENT_TIMESTAMP, "Event-Timestamp",
217 { RADIUS_ATTR_NAS_PORT_TYPE, "NAS-Port-Type", RADIUS_ATTR_INT32 },
218 { RADIUS_ATTR_TUNNEL_TYPE, "Tunnel-Type", RADIUS_ATTR_HEXDUMP },
219 { RADIUS_ATTR_TUNNEL_MEDIUM_TYPE, "Tunnel-Medium-Type",
220 RADIUS_ATTR_HEXDUMP },
221 { RADIUS_ATTR_TUNNEL_PASSWORD, "Tunnel-Password",
222 RADIUS_ATTR_UNDIST },
223 { RADIUS_ATTR_CONNECT_INFO, "Connect-Info", RADIUS_ATTR_TEXT },
224 { RADIUS_ATTR_EAP_MESSAGE, "EAP-Message", RADIUS_ATTR_UNDIST },
225 { RADIUS_ATTR_MESSAGE_AUTHENTICATOR, "Message-Authenticator",
226 RADIUS_ATTR_UNDIST },
227 { RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID, "Tunnel-Private-Group-Id",
228 RADIUS_ATTR_HEXDUMP },
229 { RADIUS_ATTR_ACCT_INTERIM_INTERVAL, "Acct-Interim-Interval",
231 { RADIUS_ATTR_CHARGEABLE_USER_IDENTITY, "Chargeable-User-Identity",
233 { RADIUS_ATTR_NAS_IPV6_ADDRESS, "NAS-IPv6-Address", RADIUS_ATTR_IPV6 },
234 { RADIUS_ATTR_ERROR_CAUSE, "Error-Cause", RADIUS_ATTR_INT32 },
235 { RADIUS_ATTR_EAP_KEY_NAME, "EAP-Key-Name", RADIUS_ATTR_HEXDUMP },
236 { RADIUS_ATTR_MOBILITY_DOMAIN_ID, "Mobility-Domain-Id",
238 { RADIUS_ATTR_WLAN_HESSID, "WLAN-HESSID", RADIUS_ATTR_TEXT },
239 { RADIUS_ATTR_WLAN_PAIRWISE_CIPHER, "WLAN-Pairwise-Cipher",
240 RADIUS_ATTR_HEXDUMP },
241 { RADIUS_ATTR_WLAN_GROUP_CIPHER, "WLAN-Group-Cipher",
242 RADIUS_ATTR_HEXDUMP },
243 { RADIUS_ATTR_WLAN_AKM_SUITE, "WLAN-AKM-Suite",
244 RADIUS_ATTR_HEXDUMP },
245 { RADIUS_ATTR_WLAN_GROUP_MGMT_CIPHER, "WLAN-Group-Mgmt-Pairwise-Cipher",
246 RADIUS_ATTR_HEXDUMP },
248 #define RADIUS_ATTRS ARRAY_SIZE(radius_attrs)
251 static struct radius_attr_type *radius_get_attr_type(u8 type)
255 for (i = 0; i < RADIUS_ATTRS; i++) {
256 if (type == radius_attrs[i].type)
257 return &radius_attrs[i];
264 static void radius_msg_dump_attr(struct radius_attr_hdr *hdr)
266 struct radius_attr_type *attr;
271 attr = radius_get_attr_type(hdr->type);
273 wpa_printf(MSG_INFO, " Attribute %d (%s) length=%d",
274 hdr->type, attr ? attr->name : "?Unknown?", hdr->length);
276 if (attr == NULL || hdr->length < sizeof(struct radius_attr_hdr))
279 len = hdr->length - sizeof(struct radius_attr_hdr);
280 pos = (unsigned char *) (hdr + 1);
282 switch (attr->data_type) {
283 case RADIUS_ATTR_TEXT:
284 printf_encode(buf, sizeof(buf), pos, len);
285 wpa_printf(MSG_INFO, " Value: '%s'", buf);
291 os_memcpy(&addr, pos, 4);
292 wpa_printf(MSG_INFO, " Value: %s",
295 wpa_printf(MSG_INFO, " Invalid IP address length %d",
301 case RADIUS_ATTR_IPV6:
304 struct in6_addr *addr = (struct in6_addr *) pos;
305 atxt = inet_ntop(AF_INET6, addr, buf, sizeof(buf));
306 wpa_printf(MSG_INFO, " Value: %s",
309 wpa_printf(MSG_INFO, " Invalid IPv6 address length %d",
313 #endif /* CONFIG_IPV6 */
315 case RADIUS_ATTR_HEXDUMP:
316 case RADIUS_ATTR_UNDIST:
317 wpa_snprintf_hex(buf, sizeof(buf), pos, len);
318 wpa_printf(MSG_INFO, " Value: %s", buf);
321 case RADIUS_ATTR_INT32:
323 wpa_printf(MSG_INFO, " Value: %u",
326 wpa_printf(MSG_INFO, " Invalid INT32 length %d",
336 void radius_msg_dump(struct radius_msg *msg)
340 wpa_printf(MSG_INFO, "RADIUS message: code=%d (%s) identifier=%d length=%d",
341 msg->hdr->code, radius_code_string(msg->hdr->code),
342 msg->hdr->identifier, be_to_host16(msg->hdr->length));
344 for (i = 0; i < msg->attr_used; i++) {
345 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
346 radius_msg_dump_attr(attr);
351 int radius_msg_finish(struct radius_msg *msg, const u8 *secret,
355 u8 auth[MD5_MAC_LEN];
356 struct radius_attr_hdr *attr;
358 os_memset(auth, 0, MD5_MAC_LEN);
359 attr = radius_msg_add_attr(msg,
360 RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
363 wpa_printf(MSG_WARNING, "RADIUS: Could not add "
364 "Message-Authenticator");
367 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
368 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
369 wpabuf_len(msg->buf), (u8 *) (attr + 1));
371 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
373 if (wpabuf_len(msg->buf) > 0xffff) {
374 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
375 (unsigned long) wpabuf_len(msg->buf));
382 int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret,
383 size_t secret_len, const u8 *req_authenticator)
385 u8 auth[MD5_MAC_LEN];
386 struct radius_attr_hdr *attr;
390 os_memset(auth, 0, MD5_MAC_LEN);
391 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
394 wpa_printf(MSG_ERROR, "WARNING: Could not add Message-Authenticator");
397 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
398 os_memcpy(msg->hdr->authenticator, req_authenticator,
399 sizeof(msg->hdr->authenticator));
400 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
401 wpabuf_len(msg->buf), (u8 *) (attr + 1));
403 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
404 addr[0] = (u8 *) msg->hdr;
406 addr[1] = req_authenticator;
407 len[1] = MD5_MAC_LEN;
408 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
409 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
412 md5_vector(4, addr, len, msg->hdr->authenticator);
414 if (wpabuf_len(msg->buf) > 0xffff) {
415 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
416 (unsigned long) wpabuf_len(msg->buf));
423 int radius_msg_finish_das_resp(struct radius_msg *msg, const u8 *secret,
425 const struct radius_hdr *req_hdr)
429 u8 auth[MD5_MAC_LEN];
430 struct radius_attr_hdr *attr;
432 os_memset(auth, 0, MD5_MAC_LEN);
433 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
436 wpa_printf(MSG_WARNING, "Could not add Message-Authenticator");
440 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
441 os_memcpy(msg->hdr->authenticator, req_hdr->authenticator, 16);
442 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
443 wpabuf_len(msg->buf), (u8 *) (attr + 1));
445 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
446 addr[0] = wpabuf_head_u8(msg->buf);
447 len[0] = wpabuf_len(msg->buf);
450 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0)
453 if (wpabuf_len(msg->buf) > 0xffff) {
454 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
455 (unsigned long) wpabuf_len(msg->buf));
462 void radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret,
468 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
469 os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN);
470 addr[0] = wpabuf_head(msg->buf);
471 len[0] = wpabuf_len(msg->buf);
474 md5_vector(2, addr, len, msg->hdr->authenticator);
476 if (wpabuf_len(msg->buf) > 0xffff) {
477 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
478 (unsigned long) wpabuf_len(msg->buf));
483 void radius_msg_finish_acct_resp(struct radius_msg *msg, const u8 *secret,
484 size_t secret_len, const u8 *req_authenticator)
489 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
490 os_memcpy(msg->hdr->authenticator, req_authenticator, MD5_MAC_LEN);
491 addr[0] = wpabuf_head(msg->buf);
492 len[0] = wpabuf_len(msg->buf);
495 md5_vector(2, addr, len, msg->hdr->authenticator);
497 if (wpabuf_len(msg->buf) > 0xffff) {
498 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
499 (unsigned long) wpabuf_len(msg->buf));
504 int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret,
509 u8 zero[MD5_MAC_LEN];
510 u8 hash[MD5_MAC_LEN];
512 os_memset(zero, 0, sizeof(zero));
513 addr[0] = (u8 *) msg->hdr;
514 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
516 len[1] = MD5_MAC_LEN;
517 addr[2] = (u8 *) (msg->hdr + 1);
518 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
521 md5_vector(4, addr, len, hash);
522 return os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0;
526 int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret,
531 u8 zero[MD5_MAC_LEN];
532 u8 hash[MD5_MAC_LEN];
533 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
534 u8 orig_authenticator[16];
536 struct radius_attr_hdr *attr = NULL, *tmp;
539 os_memset(zero, 0, sizeof(zero));
540 addr[0] = (u8 *) msg->hdr;
541 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
543 len[1] = MD5_MAC_LEN;
544 addr[2] = (u8 *) (msg->hdr + 1);
545 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
548 md5_vector(4, addr, len, hash);
549 if (os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0)
552 for (i = 0; i < msg->attr_used; i++) {
553 tmp = radius_get_attr_hdr(msg, i);
554 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
556 wpa_printf(MSG_WARNING, "Multiple "
557 "Message-Authenticator attributes "
558 "in RADIUS message");
566 /* Message-Authenticator is MAY; not required */
570 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
571 os_memset(attr + 1, 0, MD5_MAC_LEN);
572 os_memcpy(orig_authenticator, msg->hdr->authenticator,
573 sizeof(orig_authenticator));
574 os_memset(msg->hdr->authenticator, 0,
575 sizeof(msg->hdr->authenticator));
576 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
577 wpabuf_len(msg->buf), auth);
578 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
579 os_memcpy(msg->hdr->authenticator, orig_authenticator,
580 sizeof(orig_authenticator));
582 return os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0;
586 static int radius_msg_add_attr_to_array(struct radius_msg *msg,
587 struct radius_attr_hdr *attr)
589 if (msg->attr_used >= msg->attr_size) {
591 int nlen = msg->attr_size * 2;
593 nattr_pos = os_realloc_array(msg->attr_pos, nlen,
594 sizeof(*msg->attr_pos));
595 if (nattr_pos == NULL)
598 msg->attr_pos = nattr_pos;
599 msg->attr_size = nlen;
602 msg->attr_pos[msg->attr_used++] =
603 (unsigned char *) attr - wpabuf_head_u8(msg->buf);
609 struct radius_attr_hdr *radius_msg_add_attr(struct radius_msg *msg, u8 type,
610 const u8 *data, size_t data_len)
613 struct radius_attr_hdr *attr;
615 if (data_len > RADIUS_MAX_ATTR_LEN) {
616 wpa_printf(MSG_ERROR, "radius_msg_add_attr: too long attribute (%lu bytes)",
617 (unsigned long) data_len);
621 buf_needed = sizeof(*attr) + data_len;
623 if (wpabuf_tailroom(msg->buf) < buf_needed) {
624 /* allocate more space for message buffer */
625 if (wpabuf_resize(&msg->buf, buf_needed) < 0)
627 msg->hdr = wpabuf_mhead(msg->buf);
630 attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr));
632 attr->length = sizeof(*attr) + data_len;
633 wpabuf_put_data(msg->buf, data, data_len);
635 if (radius_msg_add_attr_to_array(msg, attr))
643 * radius_msg_parse - Parse a RADIUS message
644 * @data: RADIUS message to be parsed
645 * @len: Length of data buffer in octets
646 * Returns: Parsed RADIUS message or %NULL on failure
648 * This parses a RADIUS message and makes a copy of its data. The caller is
649 * responsible for freeing the returned data with radius_msg_free().
651 struct radius_msg * radius_msg_parse(const u8 *data, size_t len)
653 struct radius_msg *msg;
654 struct radius_hdr *hdr;
655 struct radius_attr_hdr *attr;
657 unsigned char *pos, *end;
659 if (data == NULL || len < sizeof(*hdr))
662 hdr = (struct radius_hdr *) data;
664 msg_len = be_to_host16(hdr->length);
665 if (msg_len < sizeof(*hdr) || msg_len > len) {
666 wpa_printf(MSG_INFO, "RADIUS: Invalid message length");
671 wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after "
672 "RADIUS message", (unsigned long) len - msg_len);
675 msg = os_zalloc(sizeof(*msg));
679 msg->buf = wpabuf_alloc_copy(data, msg_len);
680 if (msg->buf == NULL || radius_msg_initialize(msg)) {
681 radius_msg_free(msg);
684 msg->hdr = wpabuf_mhead(msg->buf);
686 /* parse attributes */
687 pos = wpabuf_mhead_u8(msg->buf) + sizeof(struct radius_hdr);
688 end = wpabuf_mhead_u8(msg->buf) + wpabuf_len(msg->buf);
690 if ((size_t) (end - pos) < sizeof(*attr))
693 attr = (struct radius_attr_hdr *) pos;
695 if (pos + attr->length > end || attr->length < sizeof(*attr))
698 /* TODO: check that attr->length is suitable for attr->type */
700 if (radius_msg_add_attr_to_array(msg, attr))
709 radius_msg_free(msg);
714 int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len)
716 const u8 *pos = data;
717 size_t left = data_len;
721 if (left > RADIUS_MAX_ATTR_LEN)
722 len = RADIUS_MAX_ATTR_LEN;
726 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE,
738 struct wpabuf * radius_msg_get_eap(struct radius_msg *msg)
742 struct radius_attr_hdr *attr;
748 for (i = 0; i < msg->attr_used; i++) {
749 attr = radius_get_attr_hdr(msg, i);
750 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
751 attr->length > sizeof(struct radius_attr_hdr))
752 len += attr->length - sizeof(struct radius_attr_hdr);
758 eap = wpabuf_alloc(len);
762 for (i = 0; i < msg->attr_used; i++) {
763 attr = radius_get_attr_hdr(msg, i);
764 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
765 attr->length > sizeof(struct radius_attr_hdr)) {
766 int flen = attr->length - sizeof(*attr);
767 wpabuf_put_data(eap, attr + 1, flen);
775 int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret,
776 size_t secret_len, const u8 *req_auth)
778 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
779 u8 orig_authenticator[16];
780 struct radius_attr_hdr *attr = NULL, *tmp;
783 for (i = 0; i < msg->attr_used; i++) {
784 tmp = radius_get_attr_hdr(msg, i);
785 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
787 wpa_printf(MSG_INFO, "Multiple Message-Authenticator attributes in RADIUS message");
795 wpa_printf(MSG_INFO, "No Message-Authenticator attribute found");
799 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
800 os_memset(attr + 1, 0, MD5_MAC_LEN);
802 os_memcpy(orig_authenticator, msg->hdr->authenticator,
803 sizeof(orig_authenticator));
804 os_memcpy(msg->hdr->authenticator, req_auth,
805 sizeof(msg->hdr->authenticator));
807 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
808 wpabuf_len(msg->buf), auth);
809 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
811 os_memcpy(msg->hdr->authenticator, orig_authenticator,
812 sizeof(orig_authenticator));
815 if (os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0) {
816 wpa_printf(MSG_INFO, "Invalid Message-Authenticator!");
824 int radius_msg_verify(struct radius_msg *msg, const u8 *secret,
825 size_t secret_len, struct radius_msg *sent_msg, int auth)
829 u8 hash[MD5_MAC_LEN];
831 if (sent_msg == NULL) {
832 wpa_printf(MSG_INFO, "No matching Access-Request message found");
837 radius_msg_verify_msg_auth(msg, secret, secret_len,
838 sent_msg->hdr->authenticator)) {
842 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
843 addr[0] = (u8 *) msg->hdr;
845 addr[1] = sent_msg->hdr->authenticator;
846 len[1] = MD5_MAC_LEN;
847 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
848 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
851 md5_vector(4, addr, len, hash);
852 if (os_memcmp_const(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) {
853 wpa_printf(MSG_INFO, "Response Authenticator invalid!");
861 int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src,
864 struct radius_attr_hdr *attr;
868 for (i = 0; i < src->attr_used; i++) {
869 attr = radius_get_attr_hdr(src, i);
870 if (attr->type == type && attr->length >= sizeof(*attr)) {
871 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1),
872 attr->length - sizeof(*attr)))
882 /* Create Request Authenticator. The value should be unique over the lifetime
883 * of the shared secret between authenticator and authentication server.
884 * Use one-way MD5 hash calculated from current timestamp and some data given
886 void radius_msg_make_authenticator(struct radius_msg *msg,
887 const u8 *data, size_t len)
896 addr[0] = (u8 *) &tv;
897 elen[0] = sizeof(tv);
902 md5_vector(3, addr, elen, msg->hdr->authenticator);
906 /* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message.
907 * Returns the Attribute payload and sets alen to indicate the length of the
908 * payload if a vendor attribute with subtype is found, otherwise returns NULL.
909 * The returned payload is allocated with os_malloc() and caller must free it
910 * by calling os_free().
912 static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor,
913 u8 subtype, size_t *alen)
921 for (i = 0; i < msg->attr_used; i++) {
922 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
925 struct radius_attr_vendor *vhdr;
927 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC ||
928 attr->length < sizeof(*attr))
931 left = attr->length - sizeof(*attr);
935 pos = (u8 *) (attr + 1);
937 os_memcpy(&vendor_id, pos, 4);
941 if (ntohl(vendor_id) != vendor)
944 while (left >= sizeof(*vhdr)) {
945 vhdr = (struct radius_attr_vendor *) pos;
946 if (vhdr->vendor_length > left ||
947 vhdr->vendor_length < sizeof(*vhdr)) {
950 if (vhdr->vendor_type != subtype) {
951 pos += vhdr->vendor_length;
952 left -= vhdr->vendor_length;
956 len = vhdr->vendor_length - sizeof(*vhdr);
957 data = os_malloc(len);
960 os_memcpy(data, pos + sizeof(*vhdr), len);
971 static u8 * decrypt_ms_key(const u8 *key, size_t len,
972 const u8 *req_authenticator,
973 const u8 *secret, size_t secret_len, size_t *reslen)
975 u8 *plain, *ppos, *res;
978 u8 hash[MD5_MAC_LEN];
983 /* key: 16-bit salt followed by encrypted key info */
991 wpa_printf(MSG_INFO, "Invalid ms key len %lu",
992 (unsigned long) left);
997 ppos = plain = os_malloc(plen);
1003 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1004 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1007 elen[0] = secret_len;
1009 addr[1] = req_authenticator;
1010 elen[1] = MD5_MAC_LEN;
1012 elen[2] = 2; /* Salt */
1014 addr[1] = pos - MD5_MAC_LEN;
1015 elen[1] = MD5_MAC_LEN;
1017 md5_vector(first ? 3 : 2, addr, elen, hash);
1020 for (i = 0; i < MD5_MAC_LEN; i++)
1021 *ppos++ = *pos++ ^ hash[i];
1022 left -= MD5_MAC_LEN;
1025 if (plain[0] == 0 || plain[0] > plen - 1) {
1026 wpa_printf(MSG_INFO, "Failed to decrypt MPPE key");
1031 res = os_malloc(plain[0]);
1036 os_memcpy(res, plain + 1, plain[0]);
1044 static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt,
1045 const u8 *req_authenticator,
1046 const u8 *secret, size_t secret_len,
1047 u8 *ebuf, size_t *elen)
1049 int i, len, first = 1;
1050 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos;
1054 WPA_PUT_BE16(saltbuf, salt);
1058 len = (len & 0xf0) + 16;
1060 os_memset(ebuf, 0, len);
1062 os_memcpy(ebuf + 1, key, key_len);
1068 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1069 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1071 _len[0] = secret_len;
1073 addr[1] = req_authenticator;
1074 _len[1] = MD5_MAC_LEN;
1076 _len[2] = sizeof(saltbuf);
1078 addr[1] = pos - MD5_MAC_LEN;
1079 _len[1] = MD5_MAC_LEN;
1081 md5_vector(first ? 3 : 2, addr, _len, hash);
1084 for (i = 0; i < MD5_MAC_LEN; i++)
1092 struct radius_ms_mppe_keys *
1093 radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
1094 const u8 *secret, size_t secret_len)
1098 struct radius_ms_mppe_keys *keys;
1100 if (msg == NULL || sent_msg == NULL)
1103 keys = os_zalloc(sizeof(*keys));
1107 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1108 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY,
1111 keys->send = decrypt_ms_key(key, keylen,
1112 sent_msg->hdr->authenticator,
1118 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1119 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY,
1122 keys->recv = decrypt_ms_key(key, keylen,
1123 sent_msg->hdr->authenticator,
1133 struct radius_ms_mppe_keys *
1134 radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
1135 const u8 *secret, size_t secret_len)
1139 struct radius_ms_mppe_keys *keys;
1141 if (msg == NULL || sent_msg == NULL)
1144 keys = os_zalloc(sizeof(*keys));
1148 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO,
1149 RADIUS_CISCO_AV_PAIR, &keylen);
1150 if (key && keylen == 51 &&
1151 os_memcmp(key, "leap:session-key=", 17) == 0) {
1152 keys->recv = decrypt_ms_key(key + 17, keylen - 17,
1153 sent_msg->hdr->authenticator,
1163 int radius_msg_add_mppe_keys(struct radius_msg *msg,
1164 const u8 *req_authenticator,
1165 const u8 *secret, size_t secret_len,
1166 const u8 *send_key, size_t send_key_len,
1167 const u8 *recv_key, size_t recv_key_len)
1169 struct radius_attr_hdr *attr;
1170 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT);
1172 struct radius_attr_vendor *vhdr;
1178 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2;
1180 /* MS-MPPE-Send-Key */
1181 buf = os_malloc(hlen + send_key_len + 16);
1186 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1187 pos += sizeof(vendor_id);
1188 vhdr = (struct radius_attr_vendor *) pos;
1189 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY;
1190 pos = (u8 *) (vhdr + 1);
1191 salt = os_random() | 0x8000;
1192 WPA_PUT_BE16(pos, salt);
1194 encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret,
1195 secret_len, pos, &elen);
1196 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1198 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1205 /* MS-MPPE-Recv-Key */
1206 buf = os_malloc(hlen + send_key_len + 16);
1211 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1212 pos += sizeof(vendor_id);
1213 vhdr = (struct radius_attr_vendor *) pos;
1214 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY;
1215 pos = (u8 *) (vhdr + 1);
1217 WPA_PUT_BE16(pos, salt);
1219 encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret,
1220 secret_len, pos, &elen);
1221 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1223 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1234 int radius_msg_add_wfa(struct radius_msg *msg, u8 subtype, const u8 *data,
1237 struct radius_attr_hdr *attr;
1242 buf = os_malloc(alen);
1246 WPA_PUT_BE32(pos, RADIUS_VENDOR_ID_WFA);
1250 os_memcpy(pos, data, len);
1251 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1261 int radius_user_password_hide(struct radius_msg *msg,
1262 const u8 *data, size_t data_len,
1263 const u8 *secret, size_t secret_len,
1264 u8 *buf, size_t buf_len)
1266 size_t padlen, i, pos;
1271 if (data_len + 16 > buf_len)
1274 os_memcpy(buf, data, data_len);
1276 padlen = data_len % 16;
1277 if (padlen && data_len < buf_len) {
1278 padlen = 16 - padlen;
1279 os_memset(buf + data_len, 0, padlen);
1280 buf_len = data_len + padlen;
1286 len[0] = secret_len;
1287 addr[1] = msg->hdr->authenticator;
1289 md5_vector(2, addr, len, hash);
1291 for (i = 0; i < 16; i++)
1295 while (pos < buf_len) {
1297 len[0] = secret_len;
1298 addr[1] = &buf[pos - 16];
1300 md5_vector(2, addr, len, hash);
1302 for (i = 0; i < 16; i++)
1303 buf[pos + i] ^= hash[i];
1312 /* Add User-Password attribute to a RADIUS message and encrypt it as specified
1313 * in RFC 2865, Chap. 5.2 */
1314 struct radius_attr_hdr *
1315 radius_msg_add_attr_user_password(struct radius_msg *msg,
1316 const u8 *data, size_t data_len,
1317 const u8 *secret, size_t secret_len)
1322 res = radius_user_password_hide(msg, data, data_len,
1323 secret, secret_len, buf, sizeof(buf));
1327 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD,
1332 int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len)
1334 struct radius_attr_hdr *attr = NULL, *tmp;
1337 for (i = 0; i < msg->attr_used; i++) {
1338 tmp = radius_get_attr_hdr(msg, i);
1339 if (tmp->type == type) {
1345 if (!attr || attr->length < sizeof(*attr))
1348 dlen = attr->length - sizeof(*attr);
1350 os_memcpy(buf, (attr + 1), dlen > len ? len : dlen);
1355 int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf,
1356 size_t *len, const u8 *start)
1359 struct radius_attr_hdr *attr = NULL, *tmp;
1361 for (i = 0; i < msg->attr_used; i++) {
1362 tmp = radius_get_attr_hdr(msg, i);
1363 if (tmp->type == type &&
1364 (start == NULL || (u8 *) tmp > start)) {
1370 if (!attr || attr->length < sizeof(*attr))
1373 *buf = (u8 *) (attr + 1);
1374 *len = attr->length - sizeof(*attr);
1379 int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len)
1384 for (count = 0, i = 0; i < msg->attr_used; i++) {
1385 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
1386 if (attr->type == type &&
1387 attr->length >= sizeof(struct radius_attr_hdr) + min_len)
1395 struct radius_tunnel_attrs {
1397 int type; /* Tunnel-Type */
1398 int medium_type; /* Tunnel-Medium-Type */
1404 * radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information
1405 * @msg: RADIUS message
1406 * Returns: VLAN ID for the first tunnel configuration of -1 if none is found
1408 int radius_msg_get_vlanid(struct radius_msg *msg)
1410 struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun;
1412 struct radius_attr_hdr *attr = NULL;
1417 os_memset(&tunnel, 0, sizeof(tunnel));
1419 for (i = 0; i < msg->attr_used; i++) {
1420 attr = radius_get_attr_hdr(msg, i);
1421 if (attr->length < sizeof(*attr))
1423 data = (const u8 *) (attr + 1);
1424 dlen = attr->length - sizeof(*attr);
1425 if (attr->length < 3)
1427 if (data[0] >= RADIUS_TUNNEL_TAGS)
1430 tun = &tunnel[data[0]];
1432 switch (attr->type) {
1433 case RADIUS_ATTR_TUNNEL_TYPE:
1434 if (attr->length != 6)
1437 tun->type = WPA_GET_BE24(data + 1);
1439 case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE:
1440 if (attr->length != 6)
1443 tun->medium_type = WPA_GET_BE24(data + 1);
1445 case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID:
1446 if (data[0] < RADIUS_TUNNEL_TAGS) {
1450 if (dlen >= sizeof(buf))
1452 os_memcpy(buf, data, dlen);
1455 tun->vlanid = atoi(buf);
1460 for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) {
1462 if (tun->tag_used &&
1463 tun->type == RADIUS_TUNNEL_TYPE_VLAN &&
1464 tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 &&
1474 * radius_msg_get_tunnel_password - Parse RADIUS attribute Tunnel-Password
1475 * @msg: Received RADIUS message
1476 * @keylen: Length of returned password
1477 * @secret: RADIUS shared secret
1478 * @secret_len: Length of secret
1479 * @sent_msg: Sent RADIUS message
1480 * @n: Number of password attribute to return (starting with 0)
1481 * Returns: Pointer to n-th password (free with os_free) or %NULL
1483 char * radius_msg_get_tunnel_password(struct radius_msg *msg, int *keylen,
1484 const u8 *secret, size_t secret_len,
1485 struct radius_msg *sent_msg, size_t n)
1496 struct radius_attr_hdr *attr;
1499 const u8 *fdata = NULL; /* points to found item */
1503 /* find n-th valid Tunnel-Password attribute */
1504 for (i = 0; i < msg->attr_used; i++) {
1505 attr = radius_get_attr_hdr(msg, i);
1507 attr->type != RADIUS_ATTR_TUNNEL_PASSWORD) {
1510 if (attr->length <= 5)
1512 data = (const u8 *) (attr + 1);
1513 dlen = attr->length - sizeof(*attr);
1514 if (dlen <= 3 || dlen % 16 != 3)
1527 /* alloc writable memory for decryption */
1528 buf = os_malloc(fdlen);
1531 os_memcpy(buf, fdata, fdlen);
1538 /* decrypt blocks */
1539 pos = buf + buflen - 16; /* last block */
1540 while (pos >= str + 16) { /* all but the first block */
1542 len[0] = secret_len;
1545 md5_vector(2, addr, len, hash);
1547 for (i = 0; i < 16; i++)
1553 /* decrypt first block */
1557 len[0] = secret_len;
1558 addr[1] = sent_msg->hdr->authenticator;
1562 md5_vector(3, addr, len, hash);
1564 for (i = 0; i < 16; i++)
1567 /* derive plaintext length from first subfield */
1568 *keylen = (unsigned char) str[0];
1569 if ((u8 *) (str + *keylen) >= (u8 *) (buf + buflen)) {
1570 /* decryption error - invalid key length */
1574 /* empty password */
1578 /* copy passphrase into new buffer */
1579 ret = os_malloc(*keylen);
1581 os_memcpy(ret, str + 1, *keylen);
1584 /* return new buffer */
1590 void radius_free_class(struct radius_class_data *c)
1595 for (i = 0; i < c->count; i++)
1596 os_free(c->attr[i].data);
1603 int radius_copy_class(struct radius_class_data *dst,
1604 const struct radius_class_data *src)
1608 if (src->attr == NULL)
1611 dst->attr = os_calloc(src->count, sizeof(struct radius_attr_data));
1612 if (dst->attr == NULL)
1617 for (i = 0; i < src->count; i++) {
1618 dst->attr[i].data = os_malloc(src->attr[i].len);
1619 if (dst->attr[i].data == NULL)
1622 os_memcpy(dst->attr[i].data, src->attr[i].data,
1624 dst->attr[i].len = src->attr[i].len;
1631 u8 radius_msg_find_unlisted_attr(struct radius_msg *msg, u8 *attrs)
1634 struct radius_attr_hdr *attr;
1636 for (i = 0; i < msg->attr_used; i++) {
1637 attr = radius_get_attr_hdr(msg, i);
1639 for (j = 0; attrs[j]; j++) {
1640 if (attr->type == attrs[j])
1645 return attr->type; /* unlisted attr */