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 },
237 #define RADIUS_ATTRS ARRAY_SIZE(radius_attrs)
240 static struct radius_attr_type *radius_get_attr_type(u8 type)
244 for (i = 0; i < RADIUS_ATTRS; i++) {
245 if (type == radius_attrs[i].type)
246 return &radius_attrs[i];
253 static void radius_msg_dump_attr(struct radius_attr_hdr *hdr)
255 struct radius_attr_type *attr;
260 attr = radius_get_attr_type(hdr->type);
262 wpa_printf(MSG_INFO, " Attribute %d (%s) length=%d",
263 hdr->type, attr ? attr->name : "?Unknown?", hdr->length);
265 if (attr == NULL || hdr->length < sizeof(struct radius_attr_hdr))
268 len = hdr->length - sizeof(struct radius_attr_hdr);
269 pos = (unsigned char *) (hdr + 1);
271 switch (attr->data_type) {
272 case RADIUS_ATTR_TEXT:
273 printf_encode(buf, sizeof(buf), pos, len);
274 wpa_printf(MSG_INFO, " Value: '%s'", buf);
280 os_memcpy(&addr, pos, 4);
281 wpa_printf(MSG_INFO, " Value: %s",
284 wpa_printf(MSG_INFO, " Invalid IP address length %d",
290 case RADIUS_ATTR_IPV6:
293 struct in6_addr *addr = (struct in6_addr *) pos;
294 atxt = inet_ntop(AF_INET6, addr, buf, sizeof(buf));
295 wpa_printf(MSG_INFO, " Value: %s",
298 wpa_printf(MSG_INFO, " Invalid IPv6 address length %d",
302 #endif /* CONFIG_IPV6 */
304 case RADIUS_ATTR_HEXDUMP:
305 case RADIUS_ATTR_UNDIST:
306 wpa_snprintf_hex(buf, sizeof(buf), pos, len);
307 wpa_printf(MSG_INFO, " Value: %s", buf);
310 case RADIUS_ATTR_INT32:
312 wpa_printf(MSG_INFO, " Value: %u",
315 wpa_printf(MSG_INFO, " Invalid INT32 length %d",
325 void radius_msg_dump(struct radius_msg *msg)
329 wpa_printf(MSG_INFO, "RADIUS message: code=%d (%s) identifier=%d length=%d",
330 msg->hdr->code, radius_code_string(msg->hdr->code),
331 msg->hdr->identifier, be_to_host16(msg->hdr->length));
333 for (i = 0; i < msg->attr_used; i++) {
334 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
335 radius_msg_dump_attr(attr);
340 int radius_msg_finish(struct radius_msg *msg, const u8 *secret,
344 u8 auth[MD5_MAC_LEN];
345 struct radius_attr_hdr *attr;
347 os_memset(auth, 0, MD5_MAC_LEN);
348 attr = radius_msg_add_attr(msg,
349 RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
352 wpa_printf(MSG_WARNING, "RADIUS: Could not add "
353 "Message-Authenticator");
356 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
357 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
358 wpabuf_len(msg->buf), (u8 *) (attr + 1));
360 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
362 if (wpabuf_len(msg->buf) > 0xffff) {
363 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
364 (unsigned long) wpabuf_len(msg->buf));
371 int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret,
372 size_t secret_len, const u8 *req_authenticator)
374 u8 auth[MD5_MAC_LEN];
375 struct radius_attr_hdr *attr;
379 os_memset(auth, 0, MD5_MAC_LEN);
380 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
383 wpa_printf(MSG_ERROR, "WARNING: Could not add Message-Authenticator");
386 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
387 os_memcpy(msg->hdr->authenticator, req_authenticator,
388 sizeof(msg->hdr->authenticator));
389 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
390 wpabuf_len(msg->buf), (u8 *) (attr + 1));
392 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
393 addr[0] = (u8 *) msg->hdr;
395 addr[1] = req_authenticator;
396 len[1] = MD5_MAC_LEN;
397 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
398 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
401 md5_vector(4, addr, len, msg->hdr->authenticator);
403 if (wpabuf_len(msg->buf) > 0xffff) {
404 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
405 (unsigned long) wpabuf_len(msg->buf));
412 int radius_msg_finish_das_resp(struct radius_msg *msg, const u8 *secret,
414 const struct radius_hdr *req_hdr)
418 u8 auth[MD5_MAC_LEN];
419 struct radius_attr_hdr *attr;
421 os_memset(auth, 0, MD5_MAC_LEN);
422 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
425 wpa_printf(MSG_WARNING, "Could not add Message-Authenticator");
429 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
430 os_memcpy(msg->hdr->authenticator, req_hdr->authenticator, 16);
431 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
432 wpabuf_len(msg->buf), (u8 *) (attr + 1));
434 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
435 addr[0] = wpabuf_head_u8(msg->buf);
436 len[0] = wpabuf_len(msg->buf);
439 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0)
442 if (wpabuf_len(msg->buf) > 0xffff) {
443 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
444 (unsigned long) wpabuf_len(msg->buf));
451 void radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret,
457 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
458 os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN);
459 addr[0] = wpabuf_head(msg->buf);
460 len[0] = wpabuf_len(msg->buf);
463 md5_vector(2, addr, len, msg->hdr->authenticator);
465 if (wpabuf_len(msg->buf) > 0xffff) {
466 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
467 (unsigned long) wpabuf_len(msg->buf));
472 void radius_msg_finish_acct_resp(struct radius_msg *msg, const u8 *secret,
473 size_t secret_len, const u8 *req_authenticator)
478 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
479 os_memcpy(msg->hdr->authenticator, req_authenticator, MD5_MAC_LEN);
480 addr[0] = wpabuf_head(msg->buf);
481 len[0] = wpabuf_len(msg->buf);
484 md5_vector(2, addr, len, msg->hdr->authenticator);
486 if (wpabuf_len(msg->buf) > 0xffff) {
487 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
488 (unsigned long) wpabuf_len(msg->buf));
493 int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret,
498 u8 zero[MD5_MAC_LEN];
499 u8 hash[MD5_MAC_LEN];
501 os_memset(zero, 0, sizeof(zero));
502 addr[0] = (u8 *) msg->hdr;
503 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
505 len[1] = MD5_MAC_LEN;
506 addr[2] = (u8 *) (msg->hdr + 1);
507 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
510 md5_vector(4, addr, len, hash);
511 return os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0;
515 int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret,
520 u8 zero[MD5_MAC_LEN];
521 u8 hash[MD5_MAC_LEN];
522 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
523 u8 orig_authenticator[16];
525 struct radius_attr_hdr *attr = NULL, *tmp;
528 os_memset(zero, 0, sizeof(zero));
529 addr[0] = (u8 *) msg->hdr;
530 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
532 len[1] = MD5_MAC_LEN;
533 addr[2] = (u8 *) (msg->hdr + 1);
534 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
537 md5_vector(4, addr, len, hash);
538 if (os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0)
541 for (i = 0; i < msg->attr_used; i++) {
542 tmp = radius_get_attr_hdr(msg, i);
543 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
545 wpa_printf(MSG_WARNING, "Multiple "
546 "Message-Authenticator attributes "
547 "in RADIUS message");
555 /* Message-Authenticator is MAY; not required */
559 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
560 os_memset(attr + 1, 0, MD5_MAC_LEN);
561 os_memcpy(orig_authenticator, msg->hdr->authenticator,
562 sizeof(orig_authenticator));
563 os_memset(msg->hdr->authenticator, 0,
564 sizeof(msg->hdr->authenticator));
565 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
566 wpabuf_len(msg->buf), auth);
567 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
568 os_memcpy(msg->hdr->authenticator, orig_authenticator,
569 sizeof(orig_authenticator));
571 return os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0;
575 static int radius_msg_add_attr_to_array(struct radius_msg *msg,
576 struct radius_attr_hdr *attr)
578 if (msg->attr_used >= msg->attr_size) {
580 int nlen = msg->attr_size * 2;
582 nattr_pos = os_realloc_array(msg->attr_pos, nlen,
583 sizeof(*msg->attr_pos));
584 if (nattr_pos == NULL)
587 msg->attr_pos = nattr_pos;
588 msg->attr_size = nlen;
591 msg->attr_pos[msg->attr_used++] =
592 (unsigned char *) attr - wpabuf_head_u8(msg->buf);
598 struct radius_attr_hdr *radius_msg_add_attr(struct radius_msg *msg, u8 type,
599 const u8 *data, size_t data_len)
602 struct radius_attr_hdr *attr;
604 if (data_len > RADIUS_MAX_ATTR_LEN) {
605 wpa_printf(MSG_ERROR, "radius_msg_add_attr: too long attribute (%lu bytes)",
606 (unsigned long) data_len);
610 buf_needed = sizeof(*attr) + data_len;
612 if (wpabuf_tailroom(msg->buf) < buf_needed) {
613 /* allocate more space for message buffer */
614 if (wpabuf_resize(&msg->buf, buf_needed) < 0)
616 msg->hdr = wpabuf_mhead(msg->buf);
619 attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr));
621 attr->length = sizeof(*attr) + data_len;
622 wpabuf_put_data(msg->buf, data, data_len);
624 if (radius_msg_add_attr_to_array(msg, attr))
632 * radius_msg_parse - Parse a RADIUS message
633 * @data: RADIUS message to be parsed
634 * @len: Length of data buffer in octets
635 * Returns: Parsed RADIUS message or %NULL on failure
637 * This parses a RADIUS message and makes a copy of its data. The caller is
638 * responsible for freeing the returned data with radius_msg_free().
640 struct radius_msg * radius_msg_parse(const u8 *data, size_t len)
642 struct radius_msg *msg;
643 struct radius_hdr *hdr;
644 struct radius_attr_hdr *attr;
646 unsigned char *pos, *end;
648 if (data == NULL || len < sizeof(*hdr))
651 hdr = (struct radius_hdr *) data;
653 msg_len = be_to_host16(hdr->length);
654 if (msg_len < sizeof(*hdr) || msg_len > len) {
655 wpa_printf(MSG_INFO, "RADIUS: Invalid message length");
660 wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after "
661 "RADIUS message", (unsigned long) len - msg_len);
664 msg = os_zalloc(sizeof(*msg));
668 msg->buf = wpabuf_alloc_copy(data, msg_len);
669 if (msg->buf == NULL || radius_msg_initialize(msg)) {
670 radius_msg_free(msg);
673 msg->hdr = wpabuf_mhead(msg->buf);
675 /* parse attributes */
676 pos = wpabuf_mhead_u8(msg->buf) + sizeof(struct radius_hdr);
677 end = wpabuf_mhead_u8(msg->buf) + wpabuf_len(msg->buf);
679 if ((size_t) (end - pos) < sizeof(*attr))
682 attr = (struct radius_attr_hdr *) pos;
684 if (pos + attr->length > end || attr->length < sizeof(*attr))
687 /* TODO: check that attr->length is suitable for attr->type */
689 if (radius_msg_add_attr_to_array(msg, attr))
698 radius_msg_free(msg);
703 int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len)
705 const u8 *pos = data;
706 size_t left = data_len;
710 if (left > RADIUS_MAX_ATTR_LEN)
711 len = RADIUS_MAX_ATTR_LEN;
715 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE,
727 struct wpabuf * radius_msg_get_eap(struct radius_msg *msg)
731 struct radius_attr_hdr *attr;
737 for (i = 0; i < msg->attr_used; i++) {
738 attr = radius_get_attr_hdr(msg, i);
739 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
740 attr->length > sizeof(struct radius_attr_hdr))
741 len += attr->length - sizeof(struct radius_attr_hdr);
747 eap = wpabuf_alloc(len);
751 for (i = 0; i < msg->attr_used; i++) {
752 attr = radius_get_attr_hdr(msg, i);
753 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
754 attr->length > sizeof(struct radius_attr_hdr)) {
755 int flen = attr->length - sizeof(*attr);
756 wpabuf_put_data(eap, attr + 1, flen);
764 int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret,
765 size_t secret_len, const u8 *req_auth)
767 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
768 u8 orig_authenticator[16];
769 struct radius_attr_hdr *attr = NULL, *tmp;
772 for (i = 0; i < msg->attr_used; i++) {
773 tmp = radius_get_attr_hdr(msg, i);
774 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
776 wpa_printf(MSG_INFO, "Multiple Message-Authenticator attributes in RADIUS message");
784 wpa_printf(MSG_INFO, "No Message-Authenticator attribute found");
788 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
789 os_memset(attr + 1, 0, MD5_MAC_LEN);
791 os_memcpy(orig_authenticator, msg->hdr->authenticator,
792 sizeof(orig_authenticator));
793 os_memcpy(msg->hdr->authenticator, req_auth,
794 sizeof(msg->hdr->authenticator));
796 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
797 wpabuf_len(msg->buf), auth);
798 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
800 os_memcpy(msg->hdr->authenticator, orig_authenticator,
801 sizeof(orig_authenticator));
804 if (os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0) {
805 wpa_printf(MSG_INFO, "Invalid Message-Authenticator!");
813 int radius_msg_verify(struct radius_msg *msg, const u8 *secret,
814 size_t secret_len, struct radius_msg *sent_msg, int auth)
818 u8 hash[MD5_MAC_LEN];
820 if (sent_msg == NULL) {
821 wpa_printf(MSG_INFO, "No matching Access-Request message found");
826 radius_msg_verify_msg_auth(msg, secret, secret_len,
827 sent_msg->hdr->authenticator)) {
831 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
832 addr[0] = (u8 *) msg->hdr;
834 addr[1] = sent_msg->hdr->authenticator;
835 len[1] = MD5_MAC_LEN;
836 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
837 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
840 md5_vector(4, addr, len, hash);
841 if (os_memcmp_const(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) {
842 wpa_printf(MSG_INFO, "Response Authenticator invalid!");
850 int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src,
853 struct radius_attr_hdr *attr;
857 for (i = 0; i < src->attr_used; i++) {
858 attr = radius_get_attr_hdr(src, i);
859 if (attr->type == type && attr->length >= sizeof(*attr)) {
860 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1),
861 attr->length - sizeof(*attr)))
871 /* Create Request Authenticator. The value should be unique over the lifetime
872 * of the shared secret between authenticator and authentication server.
873 * Use one-way MD5 hash calculated from current timestamp and some data given
875 void radius_msg_make_authenticator(struct radius_msg *msg,
876 const u8 *data, size_t len)
885 addr[0] = (u8 *) &tv;
886 elen[0] = sizeof(tv);
891 md5_vector(3, addr, elen, msg->hdr->authenticator);
895 /* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message.
896 * Returns the Attribute payload and sets alen to indicate the length of the
897 * payload if a vendor attribute with subtype is found, otherwise returns NULL.
898 * The returned payload is allocated with os_malloc() and caller must free it
899 * by calling os_free().
901 static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor,
902 u8 subtype, size_t *alen)
910 for (i = 0; i < msg->attr_used; i++) {
911 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
914 struct radius_attr_vendor *vhdr;
916 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC ||
917 attr->length < sizeof(*attr))
920 left = attr->length - sizeof(*attr);
924 pos = (u8 *) (attr + 1);
926 os_memcpy(&vendor_id, pos, 4);
930 if (ntohl(vendor_id) != vendor)
933 while (left >= sizeof(*vhdr)) {
934 vhdr = (struct radius_attr_vendor *) pos;
935 if (vhdr->vendor_length > left ||
936 vhdr->vendor_length < sizeof(*vhdr)) {
940 if (vhdr->vendor_type != subtype) {
941 pos += vhdr->vendor_length;
942 left -= vhdr->vendor_length;
946 len = vhdr->vendor_length - sizeof(*vhdr);
947 data = os_malloc(len);
950 os_memcpy(data, pos + sizeof(*vhdr), len);
961 static u8 * decrypt_ms_key(const u8 *key, size_t len,
962 const u8 *req_authenticator,
963 const u8 *secret, size_t secret_len, size_t *reslen)
965 u8 *plain, *ppos, *res;
968 u8 hash[MD5_MAC_LEN];
973 /* key: 16-bit salt followed by encrypted key info */
981 wpa_printf(MSG_INFO, "Invalid ms key len %lu",
982 (unsigned long) left);
987 ppos = plain = os_malloc(plen);
993 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
994 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
997 elen[0] = secret_len;
999 addr[1] = req_authenticator;
1000 elen[1] = MD5_MAC_LEN;
1002 elen[2] = 2; /* Salt */
1004 addr[1] = pos - MD5_MAC_LEN;
1005 elen[1] = MD5_MAC_LEN;
1007 md5_vector(first ? 3 : 2, addr, elen, hash);
1010 for (i = 0; i < MD5_MAC_LEN; i++)
1011 *ppos++ = *pos++ ^ hash[i];
1012 left -= MD5_MAC_LEN;
1015 if (plain[0] == 0 || plain[0] > plen - 1) {
1016 wpa_printf(MSG_INFO, "Failed to decrypt MPPE key");
1021 res = os_malloc(plain[0]);
1026 os_memcpy(res, plain + 1, plain[0]);
1034 static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt,
1035 const u8 *req_authenticator,
1036 const u8 *secret, size_t secret_len,
1037 u8 *ebuf, size_t *elen)
1039 int i, len, first = 1;
1040 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos;
1044 WPA_PUT_BE16(saltbuf, salt);
1048 len = (len & 0xf0) + 16;
1050 os_memset(ebuf, 0, len);
1052 os_memcpy(ebuf + 1, key, key_len);
1058 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1059 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1061 _len[0] = secret_len;
1063 addr[1] = req_authenticator;
1064 _len[1] = MD5_MAC_LEN;
1066 _len[2] = sizeof(saltbuf);
1068 addr[1] = pos - MD5_MAC_LEN;
1069 _len[1] = MD5_MAC_LEN;
1071 md5_vector(first ? 3 : 2, addr, _len, hash);
1074 for (i = 0; i < MD5_MAC_LEN; i++)
1082 struct radius_ms_mppe_keys *
1083 radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
1084 const u8 *secret, size_t secret_len)
1088 struct radius_ms_mppe_keys *keys;
1090 if (msg == NULL || sent_msg == NULL)
1093 keys = os_zalloc(sizeof(*keys));
1097 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1098 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY,
1101 keys->send = decrypt_ms_key(key, keylen,
1102 sent_msg->hdr->authenticator,
1108 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1109 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY,
1112 keys->recv = decrypt_ms_key(key, keylen,
1113 sent_msg->hdr->authenticator,
1123 struct radius_ms_mppe_keys *
1124 radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
1125 const u8 *secret, size_t secret_len)
1129 struct radius_ms_mppe_keys *keys;
1131 if (msg == NULL || sent_msg == NULL)
1134 keys = os_zalloc(sizeof(*keys));
1138 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO,
1139 RADIUS_CISCO_AV_PAIR, &keylen);
1140 if (key && keylen == 51 &&
1141 os_memcmp(key, "leap:session-key=", 17) == 0) {
1142 keys->recv = decrypt_ms_key(key + 17, keylen - 17,
1143 sent_msg->hdr->authenticator,
1153 int radius_msg_add_mppe_keys(struct radius_msg *msg,
1154 const u8 *req_authenticator,
1155 const u8 *secret, size_t secret_len,
1156 const u8 *send_key, size_t send_key_len,
1157 const u8 *recv_key, size_t recv_key_len)
1159 struct radius_attr_hdr *attr;
1160 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT);
1162 struct radius_attr_vendor *vhdr;
1168 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2;
1170 /* MS-MPPE-Send-Key */
1171 buf = os_malloc(hlen + send_key_len + 16);
1176 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1177 pos += sizeof(vendor_id);
1178 vhdr = (struct radius_attr_vendor *) pos;
1179 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY;
1180 pos = (u8 *) (vhdr + 1);
1181 salt = os_random() | 0x8000;
1182 WPA_PUT_BE16(pos, salt);
1184 encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret,
1185 secret_len, pos, &elen);
1186 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1188 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1195 /* MS-MPPE-Recv-Key */
1196 buf = os_malloc(hlen + send_key_len + 16);
1201 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1202 pos += sizeof(vendor_id);
1203 vhdr = (struct radius_attr_vendor *) pos;
1204 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY;
1205 pos = (u8 *) (vhdr + 1);
1207 WPA_PUT_BE16(pos, salt);
1209 encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret,
1210 secret_len, pos, &elen);
1211 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1213 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1224 int radius_msg_add_wfa(struct radius_msg *msg, u8 subtype, const u8 *data,
1227 struct radius_attr_hdr *attr;
1232 buf = os_malloc(alen);
1236 WPA_PUT_BE32(pos, RADIUS_VENDOR_ID_WFA);
1240 os_memcpy(pos, data, len);
1241 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1251 int radius_user_password_hide(struct radius_msg *msg,
1252 const u8 *data, size_t data_len,
1253 const u8 *secret, size_t secret_len,
1254 u8 *buf, size_t buf_len)
1256 size_t padlen, i, pos;
1261 if (data_len + 16 > buf_len)
1264 os_memcpy(buf, data, data_len);
1266 padlen = data_len % 16;
1267 if (padlen && data_len < buf_len) {
1268 padlen = 16 - padlen;
1269 os_memset(buf + data_len, 0, padlen);
1270 buf_len = data_len + padlen;
1276 len[0] = secret_len;
1277 addr[1] = msg->hdr->authenticator;
1279 md5_vector(2, addr, len, hash);
1281 for (i = 0; i < 16; i++)
1285 while (pos < buf_len) {
1287 len[0] = secret_len;
1288 addr[1] = &buf[pos - 16];
1290 md5_vector(2, addr, len, hash);
1292 for (i = 0; i < 16; i++)
1293 buf[pos + i] ^= hash[i];
1302 /* Add User-Password attribute to a RADIUS message and encrypt it as specified
1303 * in RFC 2865, Chap. 5.2 */
1304 struct radius_attr_hdr *
1305 radius_msg_add_attr_user_password(struct radius_msg *msg,
1306 const u8 *data, size_t data_len,
1307 const u8 *secret, size_t secret_len)
1312 res = radius_user_password_hide(msg, data, data_len,
1313 secret, secret_len, buf, sizeof(buf));
1317 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD,
1322 int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len)
1324 struct radius_attr_hdr *attr = NULL, *tmp;
1327 for (i = 0; i < msg->attr_used; i++) {
1328 tmp = radius_get_attr_hdr(msg, i);
1329 if (tmp->type == type) {
1335 if (!attr || attr->length < sizeof(*attr))
1338 dlen = attr->length - sizeof(*attr);
1340 os_memcpy(buf, (attr + 1), dlen > len ? len : dlen);
1345 int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf,
1346 size_t *len, const u8 *start)
1349 struct radius_attr_hdr *attr = NULL, *tmp;
1351 for (i = 0; i < msg->attr_used; i++) {
1352 tmp = radius_get_attr_hdr(msg, i);
1353 if (tmp->type == type &&
1354 (start == NULL || (u8 *) tmp > start)) {
1360 if (!attr || attr->length < sizeof(*attr))
1363 *buf = (u8 *) (attr + 1);
1364 *len = attr->length - sizeof(*attr);
1369 int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len)
1374 for (count = 0, i = 0; i < msg->attr_used; i++) {
1375 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
1376 if (attr->type == type &&
1377 attr->length >= sizeof(struct radius_attr_hdr) + min_len)
1385 struct radius_tunnel_attrs {
1387 int type; /* Tunnel-Type */
1388 int medium_type; /* Tunnel-Medium-Type */
1394 * radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information
1395 * @msg: RADIUS message
1396 * Returns: VLAN ID for the first tunnel configuration of -1 if none is found
1398 int radius_msg_get_vlanid(struct radius_msg *msg)
1400 struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun;
1402 struct radius_attr_hdr *attr = NULL;
1407 os_memset(&tunnel, 0, sizeof(tunnel));
1409 for (i = 0; i < msg->attr_used; i++) {
1410 attr = radius_get_attr_hdr(msg, i);
1411 if (attr->length < sizeof(*attr))
1413 data = (const u8 *) (attr + 1);
1414 dlen = attr->length - sizeof(*attr);
1415 if (attr->length < 3)
1417 if (data[0] >= RADIUS_TUNNEL_TAGS)
1420 tun = &tunnel[data[0]];
1422 switch (attr->type) {
1423 case RADIUS_ATTR_TUNNEL_TYPE:
1424 if (attr->length != 6)
1427 tun->type = WPA_GET_BE24(data + 1);
1429 case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE:
1430 if (attr->length != 6)
1433 tun->medium_type = WPA_GET_BE24(data + 1);
1435 case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID:
1436 if (data[0] < RADIUS_TUNNEL_TAGS) {
1440 if (dlen >= sizeof(buf))
1442 os_memcpy(buf, data, dlen);
1445 tun->vlanid = atoi(buf);
1450 for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) {
1452 if (tun->tag_used &&
1453 tun->type == RADIUS_TUNNEL_TYPE_VLAN &&
1454 tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 &&
1464 * radius_msg_get_tunnel_password - Parse RADIUS attribute Tunnel-Password
1465 * @msg: Received RADIUS message
1466 * @keylen: Length of returned password
1467 * @secret: RADIUS shared secret
1468 * @secret_len: Length of secret
1469 * @sent_msg: Sent RADIUS message
1470 * @n: Number of password attribute to return (starting with 0)
1471 * Returns: Pointer to n-th password (free with os_free) or %NULL
1473 char * radius_msg_get_tunnel_password(struct radius_msg *msg, int *keylen,
1474 const u8 *secret, size_t secret_len,
1475 struct radius_msg *sent_msg, size_t n)
1486 struct radius_attr_hdr *attr;
1489 const u8 *fdata = NULL; /* points to found item */
1493 /* find n-th valid Tunnel-Password attribute */
1494 for (i = 0; i < msg->attr_used; i++) {
1495 attr = radius_get_attr_hdr(msg, i);
1497 attr->type != RADIUS_ATTR_TUNNEL_PASSWORD) {
1500 if (attr->length <= 5)
1502 data = (const u8 *) (attr + 1);
1503 dlen = attr->length - sizeof(*attr);
1504 if (dlen <= 3 || dlen % 16 != 3)
1517 /* alloc writable memory for decryption */
1518 buf = os_malloc(fdlen);
1521 os_memcpy(buf, fdata, fdlen);
1528 /* decrypt blocks */
1529 pos = buf + buflen - 16; /* last block */
1530 while (pos >= str + 16) { /* all but the first block */
1532 len[0] = secret_len;
1535 md5_vector(2, addr, len, hash);
1537 for (i = 0; i < 16; i++)
1543 /* decrypt first block */
1547 len[0] = secret_len;
1548 addr[1] = sent_msg->hdr->authenticator;
1552 md5_vector(3, addr, len, hash);
1554 for (i = 0; i < 16; i++)
1557 /* derive plaintext length from first subfield */
1558 *keylen = (unsigned char) str[0];
1559 if ((u8 *) (str + *keylen) >= (u8 *) (buf + buflen)) {
1560 /* decryption error - invalid key length */
1564 /* empty password */
1568 /* copy passphrase into new buffer */
1569 ret = os_malloc(*keylen);
1571 os_memcpy(ret, str + 1, *keylen);
1574 /* return new buffer */
1580 void radius_free_class(struct radius_class_data *c)
1585 for (i = 0; i < c->count; i++)
1586 os_free(c->attr[i].data);
1593 int radius_copy_class(struct radius_class_data *dst,
1594 const struct radius_class_data *src)
1598 if (src->attr == NULL)
1601 dst->attr = os_calloc(src->count, sizeof(struct radius_attr_data));
1602 if (dst->attr == NULL)
1607 for (i = 0; i < src->count; i++) {
1608 dst->attr[i].data = os_malloc(src->attr[i].len);
1609 if (dst->attr[i].data == NULL)
1612 os_memcpy(dst->attr[i].data, src->attr[i].data,
1614 dst->attr[i].len = src->attr[i].len;
1621 u8 radius_msg_find_unlisted_attr(struct radius_msg *msg, u8 *attrs)
1624 struct radius_attr_hdr *attr;
1626 for (i = 0; i < msg->attr_used; i++) {
1627 attr = radius_get_attr_hdr(msg, i);
1629 for (j = 0; attrs[j]; j++) {
1630 if (attr->type == attrs[j])
1635 return attr->type; /* unlisted attr */