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 const 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_OPERATOR_NAME, "Operator-Name", RADIUS_ATTR_TEXT },
237 { RADIUS_ATTR_LOCATION_INFO, "Location-Information",
238 RADIUS_ATTR_HEXDUMP },
239 { RADIUS_ATTR_LOCATION_DATA, "Location-Data", RADIUS_ATTR_HEXDUMP },
240 { RADIUS_ATTR_BASIC_LOCATION_POLICY_RULES,
241 "Basic-Location-Policy-Rules", RADIUS_ATTR_HEXDUMP },
242 { RADIUS_ATTR_EXTENDED_LOCATION_POLICY_RULES,
243 "Extended-Location-Policy-Rules", RADIUS_ATTR_HEXDUMP },
244 { RADIUS_ATTR_LOCATION_CAPABLE, "Location-Capable", RADIUS_ATTR_INT32 },
245 { RADIUS_ATTR_REQUESTED_LOCATION_INFO, "Requested-Location-Info",
247 { RADIUS_ATTR_MOBILITY_DOMAIN_ID, "Mobility-Domain-Id",
249 { RADIUS_ATTR_WLAN_HESSID, "WLAN-HESSID", RADIUS_ATTR_TEXT },
250 { RADIUS_ATTR_WLAN_PAIRWISE_CIPHER, "WLAN-Pairwise-Cipher",
251 RADIUS_ATTR_HEXDUMP },
252 { RADIUS_ATTR_WLAN_GROUP_CIPHER, "WLAN-Group-Cipher",
253 RADIUS_ATTR_HEXDUMP },
254 { RADIUS_ATTR_WLAN_AKM_SUITE, "WLAN-AKM-Suite",
255 RADIUS_ATTR_HEXDUMP },
256 { RADIUS_ATTR_WLAN_GROUP_MGMT_CIPHER, "WLAN-Group-Mgmt-Pairwise-Cipher",
257 RADIUS_ATTR_HEXDUMP },
259 #define RADIUS_ATTRS ARRAY_SIZE(radius_attrs)
262 static const struct radius_attr_type *radius_get_attr_type(u8 type)
266 for (i = 0; i < RADIUS_ATTRS; i++) {
267 if (type == radius_attrs[i].type)
268 return &radius_attrs[i];
275 static void radius_msg_dump_attr(struct radius_attr_hdr *hdr)
277 const struct radius_attr_type *attr;
282 attr = radius_get_attr_type(hdr->type);
284 wpa_printf(MSG_INFO, " Attribute %d (%s) length=%d",
285 hdr->type, attr ? attr->name : "?Unknown?", hdr->length);
287 if (attr == NULL || hdr->length < sizeof(struct radius_attr_hdr))
290 len = hdr->length - sizeof(struct radius_attr_hdr);
291 pos = (unsigned char *) (hdr + 1);
293 switch (attr->data_type) {
294 case RADIUS_ATTR_TEXT:
295 printf_encode(buf, sizeof(buf), pos, len);
296 wpa_printf(MSG_INFO, " Value: '%s'", buf);
302 os_memcpy(&addr, pos, 4);
303 wpa_printf(MSG_INFO, " Value: %s",
306 wpa_printf(MSG_INFO, " Invalid IP address length %d",
312 case RADIUS_ATTR_IPV6:
315 struct in6_addr *addr = (struct in6_addr *) pos;
316 atxt = inet_ntop(AF_INET6, addr, buf, sizeof(buf));
317 wpa_printf(MSG_INFO, " Value: %s",
320 wpa_printf(MSG_INFO, " Invalid IPv6 address length %d",
324 #endif /* CONFIG_IPV6 */
326 case RADIUS_ATTR_HEXDUMP:
327 case RADIUS_ATTR_UNDIST:
328 wpa_snprintf_hex(buf, sizeof(buf), pos, len);
329 wpa_printf(MSG_INFO, " Value: %s", buf);
332 case RADIUS_ATTR_INT32:
334 wpa_printf(MSG_INFO, " Value: %u",
337 wpa_printf(MSG_INFO, " Invalid INT32 length %d",
347 void radius_msg_dump(struct radius_msg *msg)
351 wpa_printf(MSG_INFO, "RADIUS message: code=%d (%s) identifier=%d length=%d",
352 msg->hdr->code, radius_code_string(msg->hdr->code),
353 msg->hdr->identifier, be_to_host16(msg->hdr->length));
355 for (i = 0; i < msg->attr_used; i++) {
356 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
357 radius_msg_dump_attr(attr);
362 int radius_msg_finish(struct radius_msg *msg, const u8 *secret,
366 u8 auth[MD5_MAC_LEN];
367 struct radius_attr_hdr *attr;
369 os_memset(auth, 0, MD5_MAC_LEN);
370 attr = radius_msg_add_attr(msg,
371 RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
374 wpa_printf(MSG_WARNING, "RADIUS: Could not add "
375 "Message-Authenticator");
378 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
379 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
380 wpabuf_len(msg->buf), (u8 *) (attr + 1));
382 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
384 if (wpabuf_len(msg->buf) > 0xffff) {
385 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
386 (unsigned long) wpabuf_len(msg->buf));
393 int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret,
394 size_t secret_len, const u8 *req_authenticator)
396 u8 auth[MD5_MAC_LEN];
397 struct radius_attr_hdr *attr;
401 os_memset(auth, 0, MD5_MAC_LEN);
402 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
405 wpa_printf(MSG_ERROR, "WARNING: Could not add Message-Authenticator");
408 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
409 os_memcpy(msg->hdr->authenticator, req_authenticator,
410 sizeof(msg->hdr->authenticator));
411 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
412 wpabuf_len(msg->buf), (u8 *) (attr + 1));
414 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
415 addr[0] = (u8 *) msg->hdr;
417 addr[1] = req_authenticator;
418 len[1] = MD5_MAC_LEN;
419 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
420 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
423 md5_vector(4, addr, len, msg->hdr->authenticator);
425 if (wpabuf_len(msg->buf) > 0xffff) {
426 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
427 (unsigned long) wpabuf_len(msg->buf));
434 int radius_msg_finish_das_resp(struct radius_msg *msg, const u8 *secret,
436 const struct radius_hdr *req_hdr)
440 u8 auth[MD5_MAC_LEN];
441 struct radius_attr_hdr *attr;
443 os_memset(auth, 0, MD5_MAC_LEN);
444 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
447 wpa_printf(MSG_WARNING, "Could not add Message-Authenticator");
451 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
452 os_memcpy(msg->hdr->authenticator, req_hdr->authenticator, 16);
453 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
454 wpabuf_len(msg->buf), (u8 *) (attr + 1));
456 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
457 addr[0] = wpabuf_head_u8(msg->buf);
458 len[0] = wpabuf_len(msg->buf);
461 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0)
464 if (wpabuf_len(msg->buf) > 0xffff) {
465 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
466 (unsigned long) wpabuf_len(msg->buf));
473 void radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret,
479 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
480 os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN);
481 addr[0] = wpabuf_head(msg->buf);
482 len[0] = wpabuf_len(msg->buf);
485 md5_vector(2, addr, len, msg->hdr->authenticator);
487 if (wpabuf_len(msg->buf) > 0xffff) {
488 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
489 (unsigned long) wpabuf_len(msg->buf));
494 void radius_msg_finish_acct_resp(struct radius_msg *msg, const u8 *secret,
495 size_t secret_len, const u8 *req_authenticator)
500 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
501 os_memcpy(msg->hdr->authenticator, req_authenticator, MD5_MAC_LEN);
502 addr[0] = wpabuf_head(msg->buf);
503 len[0] = wpabuf_len(msg->buf);
506 md5_vector(2, addr, len, msg->hdr->authenticator);
508 if (wpabuf_len(msg->buf) > 0xffff) {
509 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
510 (unsigned long) wpabuf_len(msg->buf));
515 int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret,
520 u8 zero[MD5_MAC_LEN];
521 u8 hash[MD5_MAC_LEN];
523 os_memset(zero, 0, sizeof(zero));
524 addr[0] = (u8 *) msg->hdr;
525 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
527 len[1] = MD5_MAC_LEN;
528 addr[2] = (u8 *) (msg->hdr + 1);
529 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
532 md5_vector(4, addr, len, hash);
533 return os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0;
537 int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret,
542 u8 zero[MD5_MAC_LEN];
543 u8 hash[MD5_MAC_LEN];
544 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
545 u8 orig_authenticator[16];
547 struct radius_attr_hdr *attr = NULL, *tmp;
550 os_memset(zero, 0, sizeof(zero));
551 addr[0] = (u8 *) msg->hdr;
552 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
554 len[1] = MD5_MAC_LEN;
555 addr[2] = (u8 *) (msg->hdr + 1);
556 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
559 md5_vector(4, addr, len, hash);
560 if (os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0)
563 for (i = 0; i < msg->attr_used; i++) {
564 tmp = radius_get_attr_hdr(msg, i);
565 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
567 wpa_printf(MSG_WARNING, "Multiple "
568 "Message-Authenticator attributes "
569 "in RADIUS message");
577 /* Message-Authenticator is MAY; not required */
581 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
582 os_memset(attr + 1, 0, MD5_MAC_LEN);
583 os_memcpy(orig_authenticator, msg->hdr->authenticator,
584 sizeof(orig_authenticator));
585 os_memset(msg->hdr->authenticator, 0,
586 sizeof(msg->hdr->authenticator));
587 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
588 wpabuf_len(msg->buf), auth);
589 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
590 os_memcpy(msg->hdr->authenticator, orig_authenticator,
591 sizeof(orig_authenticator));
593 return os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0;
597 static int radius_msg_add_attr_to_array(struct radius_msg *msg,
598 struct radius_attr_hdr *attr)
600 if (msg->attr_used >= msg->attr_size) {
602 int nlen = msg->attr_size * 2;
604 nattr_pos = os_realloc_array(msg->attr_pos, nlen,
605 sizeof(*msg->attr_pos));
606 if (nattr_pos == NULL)
609 msg->attr_pos = nattr_pos;
610 msg->attr_size = nlen;
613 msg->attr_pos[msg->attr_used++] =
614 (unsigned char *) attr - wpabuf_head_u8(msg->buf);
620 struct radius_attr_hdr *radius_msg_add_attr(struct radius_msg *msg, u8 type,
621 const u8 *data, size_t data_len)
624 struct radius_attr_hdr *attr;
626 if (data_len > RADIUS_MAX_ATTR_LEN) {
627 wpa_printf(MSG_ERROR, "radius_msg_add_attr: too long attribute (%lu bytes)",
628 (unsigned long) data_len);
632 buf_needed = sizeof(*attr) + data_len;
634 if (wpabuf_tailroom(msg->buf) < buf_needed) {
635 /* allocate more space for message buffer */
636 if (wpabuf_resize(&msg->buf, buf_needed) < 0)
638 msg->hdr = wpabuf_mhead(msg->buf);
641 attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr));
643 attr->length = sizeof(*attr) + data_len;
644 wpabuf_put_data(msg->buf, data, data_len);
646 if (radius_msg_add_attr_to_array(msg, attr))
654 * radius_msg_parse - Parse a RADIUS message
655 * @data: RADIUS message to be parsed
656 * @len: Length of data buffer in octets
657 * Returns: Parsed RADIUS message or %NULL on failure
659 * This parses a RADIUS message and makes a copy of its data. The caller is
660 * responsible for freeing the returned data with radius_msg_free().
662 struct radius_msg * radius_msg_parse(const u8 *data, size_t len)
664 struct radius_msg *msg;
665 struct radius_hdr *hdr;
666 struct radius_attr_hdr *attr;
668 unsigned char *pos, *end;
670 if (data == NULL || len < sizeof(*hdr))
673 hdr = (struct radius_hdr *) data;
675 msg_len = be_to_host16(hdr->length);
676 if (msg_len < sizeof(*hdr) || msg_len > len) {
677 wpa_printf(MSG_INFO, "RADIUS: Invalid message length");
682 wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after "
683 "RADIUS message", (unsigned long) len - msg_len);
686 msg = os_zalloc(sizeof(*msg));
690 msg->buf = wpabuf_alloc_copy(data, msg_len);
691 if (msg->buf == NULL || radius_msg_initialize(msg)) {
692 radius_msg_free(msg);
695 msg->hdr = wpabuf_mhead(msg->buf);
697 /* parse attributes */
698 pos = wpabuf_mhead_u8(msg->buf) + sizeof(struct radius_hdr);
699 end = wpabuf_mhead_u8(msg->buf) + wpabuf_len(msg->buf);
701 if ((size_t) (end - pos) < sizeof(*attr))
704 attr = (struct radius_attr_hdr *) pos;
706 if (pos + attr->length > end || attr->length < sizeof(*attr))
709 /* TODO: check that attr->length is suitable for attr->type */
711 if (radius_msg_add_attr_to_array(msg, attr))
720 radius_msg_free(msg);
725 int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len)
727 const u8 *pos = data;
728 size_t left = data_len;
732 if (left > RADIUS_MAX_ATTR_LEN)
733 len = RADIUS_MAX_ATTR_LEN;
737 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE,
749 struct wpabuf * radius_msg_get_eap(struct radius_msg *msg)
753 struct radius_attr_hdr *attr;
759 for (i = 0; i < msg->attr_used; i++) {
760 attr = radius_get_attr_hdr(msg, i);
761 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
762 attr->length > sizeof(struct radius_attr_hdr))
763 len += attr->length - sizeof(struct radius_attr_hdr);
769 eap = wpabuf_alloc(len);
773 for (i = 0; i < msg->attr_used; i++) {
774 attr = radius_get_attr_hdr(msg, i);
775 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
776 attr->length > sizeof(struct radius_attr_hdr)) {
777 int flen = attr->length - sizeof(*attr);
778 wpabuf_put_data(eap, attr + 1, flen);
786 int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret,
787 size_t secret_len, const u8 *req_auth)
789 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
790 u8 orig_authenticator[16];
791 struct radius_attr_hdr *attr = NULL, *tmp;
794 for (i = 0; i < msg->attr_used; i++) {
795 tmp = radius_get_attr_hdr(msg, i);
796 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
798 wpa_printf(MSG_INFO, "Multiple Message-Authenticator attributes in RADIUS message");
806 wpa_printf(MSG_INFO, "No Message-Authenticator attribute found");
810 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
811 os_memset(attr + 1, 0, MD5_MAC_LEN);
813 os_memcpy(orig_authenticator, msg->hdr->authenticator,
814 sizeof(orig_authenticator));
815 os_memcpy(msg->hdr->authenticator, req_auth,
816 sizeof(msg->hdr->authenticator));
818 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
819 wpabuf_len(msg->buf), auth);
820 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
822 os_memcpy(msg->hdr->authenticator, orig_authenticator,
823 sizeof(orig_authenticator));
826 if (os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0) {
827 wpa_printf(MSG_INFO, "Invalid Message-Authenticator!");
835 int radius_msg_verify(struct radius_msg *msg, const u8 *secret,
836 size_t secret_len, struct radius_msg *sent_msg, int auth)
840 u8 hash[MD5_MAC_LEN];
842 if (sent_msg == NULL) {
843 wpa_printf(MSG_INFO, "No matching Access-Request message found");
848 radius_msg_verify_msg_auth(msg, secret, secret_len,
849 sent_msg->hdr->authenticator)) {
853 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
854 addr[0] = (u8 *) msg->hdr;
856 addr[1] = sent_msg->hdr->authenticator;
857 len[1] = MD5_MAC_LEN;
858 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
859 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
862 md5_vector(4, addr, len, hash);
863 if (os_memcmp_const(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) {
864 wpa_printf(MSG_INFO, "Response Authenticator invalid!");
872 int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src,
875 struct radius_attr_hdr *attr;
879 for (i = 0; i < src->attr_used; i++) {
880 attr = radius_get_attr_hdr(src, i);
881 if (attr->type == type && attr->length >= sizeof(*attr)) {
882 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1),
883 attr->length - sizeof(*attr)))
893 /* Create Request Authenticator. The value should be unique over the lifetime
894 * of the shared secret between authenticator and authentication server.
895 * Use one-way MD5 hash calculated from current timestamp and some data given
897 void radius_msg_make_authenticator(struct radius_msg *msg,
898 const u8 *data, size_t len)
907 addr[0] = (u8 *) &tv;
908 elen[0] = sizeof(tv);
913 md5_vector(3, addr, elen, msg->hdr->authenticator);
917 /* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message.
918 * Returns the Attribute payload and sets alen to indicate the length of the
919 * payload if a vendor attribute with subtype is found, otherwise returns NULL.
920 * The returned payload is allocated with os_malloc() and caller must free it
921 * by calling os_free().
923 static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor,
924 u8 subtype, size_t *alen)
932 for (i = 0; i < msg->attr_used; i++) {
933 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
936 struct radius_attr_vendor *vhdr;
938 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC ||
939 attr->length < sizeof(*attr))
942 left = attr->length - sizeof(*attr);
946 pos = (u8 *) (attr + 1);
948 os_memcpy(&vendor_id, pos, 4);
952 if (ntohl(vendor_id) != vendor)
955 while (left >= sizeof(*vhdr)) {
956 vhdr = (struct radius_attr_vendor *) pos;
957 if (vhdr->vendor_length > left ||
958 vhdr->vendor_length < sizeof(*vhdr)) {
961 if (vhdr->vendor_type != subtype) {
962 pos += vhdr->vendor_length;
963 left -= vhdr->vendor_length;
967 len = vhdr->vendor_length - sizeof(*vhdr);
968 data = os_malloc(len);
971 os_memcpy(data, pos + sizeof(*vhdr), len);
982 static u8 * decrypt_ms_key(const u8 *key, size_t len,
983 const u8 *req_authenticator,
984 const u8 *secret, size_t secret_len, size_t *reslen)
986 u8 *plain, *ppos, *res;
989 u8 hash[MD5_MAC_LEN];
994 /* key: 16-bit salt followed by encrypted key info */
997 wpa_printf(MSG_DEBUG, "RADIUS: %s: Len is too small: %d",
998 __func__, (int) len);
1005 wpa_printf(MSG_INFO, "RADIUS: Invalid ms key len %lu",
1006 (unsigned long) left);
1011 ppos = plain = os_malloc(plen);
1017 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1018 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1021 elen[0] = secret_len;
1023 addr[1] = req_authenticator;
1024 elen[1] = MD5_MAC_LEN;
1026 elen[2] = 2; /* Salt */
1028 addr[1] = pos - MD5_MAC_LEN;
1029 elen[1] = MD5_MAC_LEN;
1031 md5_vector(first ? 3 : 2, addr, elen, hash);
1034 for (i = 0; i < MD5_MAC_LEN; i++)
1035 *ppos++ = *pos++ ^ hash[i];
1036 left -= MD5_MAC_LEN;
1039 if (plain[0] == 0 || plain[0] > plen - 1) {
1040 wpa_printf(MSG_INFO, "RADIUS: Failed to decrypt MPPE key");
1045 res = os_malloc(plain[0]);
1050 os_memcpy(res, plain + 1, plain[0]);
1058 static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt,
1059 const u8 *req_authenticator,
1060 const u8 *secret, size_t secret_len,
1061 u8 *ebuf, size_t *elen)
1063 int i, len, first = 1;
1064 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos;
1068 WPA_PUT_BE16(saltbuf, salt);
1072 len = (len & 0xf0) + 16;
1074 os_memset(ebuf, 0, len);
1076 os_memcpy(ebuf + 1, key, key_len);
1082 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1083 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1085 _len[0] = secret_len;
1087 addr[1] = req_authenticator;
1088 _len[1] = MD5_MAC_LEN;
1090 _len[2] = sizeof(saltbuf);
1092 addr[1] = pos - MD5_MAC_LEN;
1093 _len[1] = MD5_MAC_LEN;
1095 md5_vector(first ? 3 : 2, addr, _len, hash);
1098 for (i = 0; i < MD5_MAC_LEN; i++)
1106 struct radius_ms_mppe_keys *
1107 radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
1108 const u8 *secret, size_t secret_len)
1112 struct radius_ms_mppe_keys *keys;
1114 if (msg == NULL || sent_msg == NULL)
1117 keys = os_zalloc(sizeof(*keys));
1121 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1122 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY,
1125 keys->send = decrypt_ms_key(key, keylen,
1126 sent_msg->hdr->authenticator,
1130 wpa_printf(MSG_DEBUG,
1131 "RADIUS: Failed to decrypt send key");
1136 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1137 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY,
1140 keys->recv = decrypt_ms_key(key, keylen,
1141 sent_msg->hdr->authenticator,
1145 wpa_printf(MSG_DEBUG,
1146 "RADIUS: Failed to decrypt recv key");
1155 struct radius_ms_mppe_keys *
1156 radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
1157 const u8 *secret, size_t secret_len)
1161 struct radius_ms_mppe_keys *keys;
1163 if (msg == NULL || sent_msg == NULL)
1166 keys = os_zalloc(sizeof(*keys));
1170 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO,
1171 RADIUS_CISCO_AV_PAIR, &keylen);
1172 if (key && keylen == 51 &&
1173 os_memcmp(key, "leap:session-key=", 17) == 0) {
1174 keys->recv = decrypt_ms_key(key + 17, keylen - 17,
1175 sent_msg->hdr->authenticator,
1185 int radius_msg_add_mppe_keys(struct radius_msg *msg,
1186 const u8 *req_authenticator,
1187 const u8 *secret, size_t secret_len,
1188 const u8 *send_key, size_t send_key_len,
1189 const u8 *recv_key, size_t recv_key_len)
1191 struct radius_attr_hdr *attr;
1192 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT);
1194 struct radius_attr_vendor *vhdr;
1200 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2;
1202 /* MS-MPPE-Send-Key */
1203 buf = os_malloc(hlen + send_key_len + 16);
1208 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1209 pos += sizeof(vendor_id);
1210 vhdr = (struct radius_attr_vendor *) pos;
1211 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY;
1212 pos = (u8 *) (vhdr + 1);
1213 salt = os_random() | 0x8000;
1214 WPA_PUT_BE16(pos, salt);
1216 encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret,
1217 secret_len, pos, &elen);
1218 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1220 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1227 /* MS-MPPE-Recv-Key */
1228 buf = os_malloc(hlen + recv_key_len + 16);
1233 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1234 pos += sizeof(vendor_id);
1235 vhdr = (struct radius_attr_vendor *) pos;
1236 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY;
1237 pos = (u8 *) (vhdr + 1);
1239 WPA_PUT_BE16(pos, salt);
1241 encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret,
1242 secret_len, pos, &elen);
1243 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1245 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1256 int radius_msg_add_wfa(struct radius_msg *msg, u8 subtype, const u8 *data,
1259 struct radius_attr_hdr *attr;
1264 buf = os_malloc(alen);
1268 WPA_PUT_BE32(pos, RADIUS_VENDOR_ID_WFA);
1272 os_memcpy(pos, data, len);
1273 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1283 int radius_user_password_hide(struct radius_msg *msg,
1284 const u8 *data, size_t data_len,
1285 const u8 *secret, size_t secret_len,
1286 u8 *buf, size_t buf_len)
1288 size_t padlen, i, pos;
1293 if (data_len + 16 > buf_len)
1296 os_memcpy(buf, data, data_len);
1298 padlen = data_len % 16;
1299 if (padlen && data_len < buf_len) {
1300 padlen = 16 - padlen;
1301 os_memset(buf + data_len, 0, padlen);
1302 buf_len = data_len + padlen;
1308 len[0] = secret_len;
1309 addr[1] = msg->hdr->authenticator;
1311 md5_vector(2, addr, len, hash);
1313 for (i = 0; i < 16; i++)
1317 while (pos < buf_len) {
1319 len[0] = secret_len;
1320 addr[1] = &buf[pos - 16];
1322 md5_vector(2, addr, len, hash);
1324 for (i = 0; i < 16; i++)
1325 buf[pos + i] ^= hash[i];
1334 /* Add User-Password attribute to a RADIUS message and encrypt it as specified
1335 * in RFC 2865, Chap. 5.2 */
1336 struct radius_attr_hdr *
1337 radius_msg_add_attr_user_password(struct radius_msg *msg,
1338 const u8 *data, size_t data_len,
1339 const u8 *secret, size_t secret_len)
1344 res = radius_user_password_hide(msg, data, data_len,
1345 secret, secret_len, buf, sizeof(buf));
1349 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD,
1354 int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len)
1356 struct radius_attr_hdr *attr = NULL, *tmp;
1359 for (i = 0; i < msg->attr_used; i++) {
1360 tmp = radius_get_attr_hdr(msg, i);
1361 if (tmp->type == type) {
1367 if (!attr || attr->length < sizeof(*attr))
1370 dlen = attr->length - sizeof(*attr);
1372 os_memcpy(buf, (attr + 1), dlen > len ? len : dlen);
1377 int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf,
1378 size_t *len, const u8 *start)
1381 struct radius_attr_hdr *attr = NULL, *tmp;
1383 for (i = 0; i < msg->attr_used; i++) {
1384 tmp = radius_get_attr_hdr(msg, i);
1385 if (tmp->type == type &&
1386 (start == NULL || (u8 *) tmp > start)) {
1392 if (!attr || attr->length < sizeof(*attr))
1395 *buf = (u8 *) (attr + 1);
1396 *len = attr->length - sizeof(*attr);
1401 int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len)
1406 for (count = 0, i = 0; i < msg->attr_used; i++) {
1407 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
1408 if (attr->type == type &&
1409 attr->length >= sizeof(struct radius_attr_hdr) + min_len)
1417 struct radius_tunnel_attrs {
1419 int type; /* Tunnel-Type */
1420 int medium_type; /* Tunnel-Medium-Type */
1426 * radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information
1427 * @msg: RADIUS message
1428 * Returns: VLAN ID for the first tunnel configuration or 0 if none is found
1430 int radius_msg_get_vlanid(struct radius_msg *msg)
1432 struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun;
1434 struct radius_attr_hdr *attr = NULL;
1439 os_memset(&tunnel, 0, sizeof(tunnel));
1441 for (i = 0; i < msg->attr_used; i++) {
1442 attr = radius_get_attr_hdr(msg, i);
1443 if (attr->length < sizeof(*attr))
1445 data = (const u8 *) (attr + 1);
1446 dlen = attr->length - sizeof(*attr);
1447 if (attr->length < 3)
1449 if (data[0] >= RADIUS_TUNNEL_TAGS)
1452 tun = &tunnel[data[0]];
1454 switch (attr->type) {
1455 case RADIUS_ATTR_TUNNEL_TYPE:
1456 if (attr->length != 6)
1459 tun->type = WPA_GET_BE24(data + 1);
1461 case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE:
1462 if (attr->length != 6)
1465 tun->medium_type = WPA_GET_BE24(data + 1);
1467 case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID:
1468 if (data[0] < RADIUS_TUNNEL_TAGS) {
1472 if (dlen >= sizeof(buf))
1474 os_memcpy(buf, data, dlen);
1477 tun->vlanid = atoi(buf);
1482 for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) {
1484 if (tun->tag_used &&
1485 tun->type == RADIUS_TUNNEL_TYPE_VLAN &&
1486 tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 &&
1496 * radius_msg_get_tunnel_password - Parse RADIUS attribute Tunnel-Password
1497 * @msg: Received RADIUS message
1498 * @keylen: Length of returned password
1499 * @secret: RADIUS shared secret
1500 * @secret_len: Length of secret
1501 * @sent_msg: Sent RADIUS message
1502 * @n: Number of password attribute to return (starting with 0)
1503 * Returns: Pointer to n-th password (free with os_free) or %NULL
1505 char * radius_msg_get_tunnel_password(struct radius_msg *msg, int *keylen,
1506 const u8 *secret, size_t secret_len,
1507 struct radius_msg *sent_msg, size_t n)
1518 struct radius_attr_hdr *attr;
1521 const u8 *fdata = NULL; /* points to found item */
1525 /* find n-th valid Tunnel-Password attribute */
1526 for (i = 0; i < msg->attr_used; i++) {
1527 attr = radius_get_attr_hdr(msg, i);
1529 attr->type != RADIUS_ATTR_TUNNEL_PASSWORD) {
1532 if (attr->length <= 5)
1534 data = (const u8 *) (attr + 1);
1535 dlen = attr->length - sizeof(*attr);
1536 if (dlen <= 3 || dlen % 16 != 3)
1549 /* alloc writable memory for decryption */
1550 buf = os_malloc(fdlen);
1553 os_memcpy(buf, fdata, fdlen);
1560 /* decrypt blocks */
1561 pos = buf + buflen - 16; /* last block */
1562 while (pos >= str + 16) { /* all but the first block */
1564 len[0] = secret_len;
1567 md5_vector(2, addr, len, hash);
1569 for (i = 0; i < 16; i++)
1575 /* decrypt first block */
1579 len[0] = secret_len;
1580 addr[1] = sent_msg->hdr->authenticator;
1584 md5_vector(3, addr, len, hash);
1586 for (i = 0; i < 16; i++)
1589 /* derive plaintext length from first subfield */
1590 *keylen = (unsigned char) str[0];
1591 if ((u8 *) (str + *keylen) >= (u8 *) (buf + buflen)) {
1592 /* decryption error - invalid key length */
1596 /* empty password */
1600 /* copy passphrase into new buffer */
1601 ret = os_malloc(*keylen);
1603 os_memcpy(ret, str + 1, *keylen);
1606 /* return new buffer */
1612 void radius_free_class(struct radius_class_data *c)
1617 for (i = 0; i < c->count; i++)
1618 os_free(c->attr[i].data);
1625 int radius_copy_class(struct radius_class_data *dst,
1626 const struct radius_class_data *src)
1630 if (src->attr == NULL)
1633 dst->attr = os_calloc(src->count, sizeof(struct radius_attr_data));
1634 if (dst->attr == NULL)
1639 for (i = 0; i < src->count; i++) {
1640 dst->attr[i].data = os_malloc(src->attr[i].len);
1641 if (dst->attr[i].data == NULL)
1644 os_memcpy(dst->attr[i].data, src->attr[i].data,
1646 dst->attr[i].len = src->attr[i].len;
1653 u8 radius_msg_find_unlisted_attr(struct radius_msg *msg, u8 *attrs)
1656 struct radius_attr_hdr *attr;
1658 for (i = 0; i < msg->attr_used; i++) {
1659 attr = radius_get_attr_hdr(msg, i);
1661 for (j = 0; attrs[j]; j++) {
1662 if (attr->type == attrs[j])
1667 return attr->type; /* unlisted attr */