2 * RADIUS message processing
3 * Copyright (c) 2002-2009, 2011-2012, 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 }
236 #define RADIUS_ATTRS (sizeof(radius_attrs) / sizeof(radius_attrs[0]))
239 static struct radius_attr_type *radius_get_attr_type(u8 type)
243 for (i = 0; i < RADIUS_ATTRS; i++) {
244 if (type == radius_attrs[i].type)
245 return &radius_attrs[i];
252 static void print_char(char c)
254 if (c >= 32 && c < 127)
261 static void radius_msg_dump_attr(struct radius_attr_hdr *hdr)
263 struct radius_attr_type *attr;
267 attr = radius_get_attr_type(hdr->type);
269 printf(" Attribute %d (%s) length=%d\n",
270 hdr->type, attr ? attr->name : "?Unknown?", hdr->length);
272 if (attr == NULL || hdr->length < sizeof(struct radius_attr_hdr))
275 len = hdr->length - sizeof(struct radius_attr_hdr);
276 pos = (unsigned char *) (hdr + 1);
278 switch (attr->data_type) {
279 case RADIUS_ATTR_TEXT:
281 for (i = 0; i < len; i++)
289 os_memcpy(&addr, pos, 4);
290 printf(" Value: %s\n", inet_ntoa(addr));
292 printf(" Invalid IP address length %d\n", len);
296 case RADIUS_ATTR_IPV6:
300 struct in6_addr *addr = (struct in6_addr *) pos;
301 atxt = inet_ntop(AF_INET6, addr, buf, sizeof(buf));
302 printf(" Value: %s\n", atxt ? atxt : "?");
304 printf(" Invalid IPv6 address length %d\n", len);
306 #endif /* CONFIG_IPV6 */
308 case RADIUS_ATTR_HEXDUMP:
309 case RADIUS_ATTR_UNDIST:
311 for (i = 0; i < len; i++)
312 printf(" %02x", pos[i]);
316 case RADIUS_ATTR_INT32:
318 printf(" Value: %u\n", WPA_GET_BE32(pos));
320 printf(" Invalid INT32 length %d\n", len);
329 void radius_msg_dump(struct radius_msg *msg)
333 printf("RADIUS message: code=%d (%s) identifier=%d length=%d\n",
334 msg->hdr->code, radius_code_string(msg->hdr->code),
335 msg->hdr->identifier, be_to_host16(msg->hdr->length));
337 for (i = 0; i < msg->attr_used; i++) {
338 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
339 radius_msg_dump_attr(attr);
344 int radius_msg_finish(struct radius_msg *msg, const u8 *secret,
348 u8 auth[MD5_MAC_LEN];
349 struct radius_attr_hdr *attr;
351 os_memset(auth, 0, MD5_MAC_LEN);
352 attr = radius_msg_add_attr(msg,
353 RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
356 wpa_printf(MSG_WARNING, "RADIUS: Could not add "
357 "Message-Authenticator");
360 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
361 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
362 wpabuf_len(msg->buf), (u8 *) (attr + 1));
364 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
366 if (wpabuf_len(msg->buf) > 0xffff) {
367 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
368 (unsigned long) wpabuf_len(msg->buf));
375 int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret,
376 size_t secret_len, const u8 *req_authenticator)
378 u8 auth[MD5_MAC_LEN];
379 struct radius_attr_hdr *attr;
383 os_memset(auth, 0, MD5_MAC_LEN);
384 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
387 printf("WARNING: Could not add Message-Authenticator\n");
390 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
391 os_memcpy(msg->hdr->authenticator, req_authenticator,
392 sizeof(msg->hdr->authenticator));
393 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
394 wpabuf_len(msg->buf), (u8 *) (attr + 1));
396 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
397 addr[0] = (u8 *) msg->hdr;
399 addr[1] = req_authenticator;
400 len[1] = MD5_MAC_LEN;
401 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
402 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
405 md5_vector(4, addr, len, msg->hdr->authenticator);
407 if (wpabuf_len(msg->buf) > 0xffff) {
408 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
409 (unsigned long) wpabuf_len(msg->buf));
416 int radius_msg_finish_das_resp(struct radius_msg *msg, const u8 *secret,
418 const struct radius_hdr *req_hdr)
422 u8 auth[MD5_MAC_LEN];
423 struct radius_attr_hdr *attr;
425 os_memset(auth, 0, MD5_MAC_LEN);
426 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
429 wpa_printf(MSG_WARNING, "Could not add Message-Authenticator");
433 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
434 os_memcpy(msg->hdr->authenticator, req_hdr->authenticator, 16);
435 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
436 wpabuf_len(msg->buf), (u8 *) (attr + 1));
438 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
439 addr[0] = wpabuf_head_u8(msg->buf);
440 len[0] = wpabuf_len(msg->buf);
443 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0)
446 if (wpabuf_len(msg->buf) > 0xffff) {
447 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
448 (unsigned long) wpabuf_len(msg->buf));
455 void radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret,
461 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
462 os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN);
463 addr[0] = wpabuf_head(msg->buf);
464 len[0] = wpabuf_len(msg->buf);
467 md5_vector(2, addr, len, msg->hdr->authenticator);
469 if (wpabuf_len(msg->buf) > 0xffff) {
470 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
471 (unsigned long) wpabuf_len(msg->buf));
476 int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret,
481 u8 zero[MD5_MAC_LEN];
482 u8 hash[MD5_MAC_LEN];
484 os_memset(zero, 0, sizeof(zero));
485 addr[0] = (u8 *) msg->hdr;
486 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
488 len[1] = MD5_MAC_LEN;
489 addr[2] = (u8 *) (msg->hdr + 1);
490 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
493 md5_vector(4, addr, len, hash);
494 return os_memcmp(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0;
498 int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret,
503 u8 zero[MD5_MAC_LEN];
504 u8 hash[MD5_MAC_LEN];
505 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
506 u8 orig_authenticator[16];
508 struct radius_attr_hdr *attr = NULL, *tmp;
511 os_memset(zero, 0, sizeof(zero));
512 addr[0] = (u8 *) msg->hdr;
513 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
515 len[1] = MD5_MAC_LEN;
516 addr[2] = (u8 *) (msg->hdr + 1);
517 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
520 md5_vector(4, addr, len, hash);
521 if (os_memcmp(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0)
524 for (i = 0; i < msg->attr_used; i++) {
525 tmp = radius_get_attr_hdr(msg, i);
526 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
528 wpa_printf(MSG_WARNING, "Multiple "
529 "Message-Authenticator attributes "
530 "in RADIUS message");
538 /* Message-Authenticator is MAY; not required */
542 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
543 os_memset(attr + 1, 0, MD5_MAC_LEN);
544 os_memcpy(orig_authenticator, msg->hdr->authenticator,
545 sizeof(orig_authenticator));
546 os_memset(msg->hdr->authenticator, 0,
547 sizeof(msg->hdr->authenticator));
548 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
549 wpabuf_len(msg->buf), auth);
550 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
551 os_memcpy(msg->hdr->authenticator, orig_authenticator,
552 sizeof(orig_authenticator));
554 return os_memcmp(orig, auth, MD5_MAC_LEN) != 0;
558 static int radius_msg_add_attr_to_array(struct radius_msg *msg,
559 struct radius_attr_hdr *attr)
561 if (msg->attr_used >= msg->attr_size) {
563 int nlen = msg->attr_size * 2;
565 nattr_pos = os_realloc_array(msg->attr_pos, nlen,
566 sizeof(*msg->attr_pos));
567 if (nattr_pos == NULL)
570 msg->attr_pos = nattr_pos;
571 msg->attr_size = nlen;
574 msg->attr_pos[msg->attr_used++] =
575 (unsigned char *) attr - wpabuf_head_u8(msg->buf);
581 struct radius_attr_hdr *radius_msg_add_attr(struct radius_msg *msg, u8 type,
582 const u8 *data, size_t data_len)
585 struct radius_attr_hdr *attr;
587 if (data_len > RADIUS_MAX_ATTR_LEN) {
588 printf("radius_msg_add_attr: too long attribute (%lu bytes)\n",
589 (unsigned long) data_len);
593 buf_needed = sizeof(*attr) + data_len;
595 if (wpabuf_tailroom(msg->buf) < buf_needed) {
596 /* allocate more space for message buffer */
597 if (wpabuf_resize(&msg->buf, buf_needed) < 0)
599 msg->hdr = wpabuf_mhead(msg->buf);
602 attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr));
604 attr->length = sizeof(*attr) + data_len;
605 wpabuf_put_data(msg->buf, data, data_len);
607 if (radius_msg_add_attr_to_array(msg, attr))
615 * radius_msg_parse - Parse a RADIUS message
616 * @data: RADIUS message to be parsed
617 * @len: Length of data buffer in octets
618 * Returns: Parsed RADIUS message or %NULL on failure
620 * This parses a RADIUS message and makes a copy of its data. The caller is
621 * responsible for freeing the returned data with radius_msg_free().
623 struct radius_msg * radius_msg_parse(const u8 *data, size_t len)
625 struct radius_msg *msg;
626 struct radius_hdr *hdr;
627 struct radius_attr_hdr *attr;
629 unsigned char *pos, *end;
631 if (data == NULL || len < sizeof(*hdr))
634 hdr = (struct radius_hdr *) data;
636 msg_len = be_to_host16(hdr->length);
637 if (msg_len < sizeof(*hdr) || msg_len > len) {
638 wpa_printf(MSG_INFO, "RADIUS: Invalid message length");
643 wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after "
644 "RADIUS message", (unsigned long) len - msg_len);
647 msg = os_zalloc(sizeof(*msg));
651 msg->buf = wpabuf_alloc_copy(data, msg_len);
652 if (msg->buf == NULL || radius_msg_initialize(msg)) {
653 radius_msg_free(msg);
656 msg->hdr = wpabuf_mhead(msg->buf);
658 /* parse attributes */
659 pos = wpabuf_mhead_u8(msg->buf) + sizeof(struct radius_hdr);
660 end = wpabuf_mhead_u8(msg->buf) + wpabuf_len(msg->buf);
662 if ((size_t) (end - pos) < sizeof(*attr))
665 attr = (struct radius_attr_hdr *) pos;
667 if (pos + attr->length > end || attr->length < sizeof(*attr))
670 /* TODO: check that attr->length is suitable for attr->type */
672 if (radius_msg_add_attr_to_array(msg, attr))
681 radius_msg_free(msg);
686 int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len)
688 const u8 *pos = data;
689 size_t left = data_len;
693 if (left > RADIUS_MAX_ATTR_LEN)
694 len = RADIUS_MAX_ATTR_LEN;
698 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE,
710 struct wpabuf * radius_msg_get_eap(struct radius_msg *msg)
714 struct radius_attr_hdr *attr;
720 for (i = 0; i < msg->attr_used; i++) {
721 attr = radius_get_attr_hdr(msg, i);
722 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
723 attr->length > sizeof(struct radius_attr_hdr))
724 len += attr->length - sizeof(struct radius_attr_hdr);
730 eap = wpabuf_alloc(len);
734 for (i = 0; i < msg->attr_used; i++) {
735 attr = radius_get_attr_hdr(msg, i);
736 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
737 attr->length > sizeof(struct radius_attr_hdr)) {
738 int flen = attr->length - sizeof(*attr);
739 wpabuf_put_data(eap, attr + 1, flen);
747 int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret,
748 size_t secret_len, const u8 *req_auth)
750 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
751 u8 orig_authenticator[16];
752 struct radius_attr_hdr *attr = NULL, *tmp;
755 for (i = 0; i < msg->attr_used; i++) {
756 tmp = radius_get_attr_hdr(msg, i);
757 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
759 printf("Multiple Message-Authenticator "
760 "attributes in RADIUS message\n");
768 printf("No Message-Authenticator attribute found\n");
772 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
773 os_memset(attr + 1, 0, MD5_MAC_LEN);
775 os_memcpy(orig_authenticator, msg->hdr->authenticator,
776 sizeof(orig_authenticator));
777 os_memcpy(msg->hdr->authenticator, req_auth,
778 sizeof(msg->hdr->authenticator));
780 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
781 wpabuf_len(msg->buf), auth);
782 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
784 os_memcpy(msg->hdr->authenticator, orig_authenticator,
785 sizeof(orig_authenticator));
788 if (os_memcmp(orig, auth, MD5_MAC_LEN) != 0) {
789 printf("Invalid Message-Authenticator!\n");
797 int radius_msg_verify(struct radius_msg *msg, const u8 *secret,
798 size_t secret_len, struct radius_msg *sent_msg, int auth)
802 u8 hash[MD5_MAC_LEN];
804 if (sent_msg == NULL) {
805 printf("No matching Access-Request message found\n");
810 radius_msg_verify_msg_auth(msg, secret, secret_len,
811 sent_msg->hdr->authenticator)) {
815 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
816 addr[0] = (u8 *) msg->hdr;
818 addr[1] = sent_msg->hdr->authenticator;
819 len[1] = MD5_MAC_LEN;
820 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
821 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
824 md5_vector(4, addr, len, hash);
825 if (os_memcmp(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) {
826 printf("Response Authenticator invalid!\n");
834 int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src,
837 struct radius_attr_hdr *attr;
841 for (i = 0; i < src->attr_used; i++) {
842 attr = radius_get_attr_hdr(src, i);
843 if (attr->type == type && attr->length >= sizeof(*attr)) {
844 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1),
845 attr->length - sizeof(*attr)))
855 /* Create Request Authenticator. The value should be unique over the lifetime
856 * of the shared secret between authenticator and authentication server.
857 * Use one-way MD5 hash calculated from current timestamp and some data given
859 void radius_msg_make_authenticator(struct radius_msg *msg,
860 const u8 *data, size_t len)
869 addr[0] = (u8 *) &tv;
870 elen[0] = sizeof(tv);
875 md5_vector(3, addr, elen, msg->hdr->authenticator);
879 /* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message.
880 * Returns the Attribute payload and sets alen to indicate the length of the
881 * payload if a vendor attribute with subtype is found, otherwise returns NULL.
882 * The returned payload is allocated with os_malloc() and caller must free it
883 * by calling os_free().
885 static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor,
886 u8 subtype, size_t *alen)
894 for (i = 0; i < msg->attr_used; i++) {
895 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
898 struct radius_attr_vendor *vhdr;
900 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC ||
901 attr->length < sizeof(*attr))
904 left = attr->length - sizeof(*attr);
908 pos = (u8 *) (attr + 1);
910 os_memcpy(&vendor_id, pos, 4);
914 if (ntohl(vendor_id) != vendor)
917 while (left >= sizeof(*vhdr)) {
918 vhdr = (struct radius_attr_vendor *) pos;
919 if (vhdr->vendor_length > left ||
920 vhdr->vendor_length < sizeof(*vhdr)) {
924 if (vhdr->vendor_type != subtype) {
925 pos += vhdr->vendor_length;
926 left -= vhdr->vendor_length;
930 len = vhdr->vendor_length - sizeof(*vhdr);
931 data = os_malloc(len);
934 os_memcpy(data, pos + sizeof(*vhdr), len);
945 static u8 * decrypt_ms_key(const u8 *key, size_t len,
946 const u8 *req_authenticator,
947 const u8 *secret, size_t secret_len, size_t *reslen)
949 u8 *plain, *ppos, *res;
952 u8 hash[MD5_MAC_LEN];
957 /* key: 16-bit salt followed by encrypted key info */
965 printf("Invalid ms key len %lu\n", (unsigned long) left);
970 ppos = plain = os_malloc(plen);
976 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
977 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
980 elen[0] = secret_len;
982 addr[1] = req_authenticator;
983 elen[1] = MD5_MAC_LEN;
985 elen[2] = 2; /* Salt */
987 addr[1] = pos - MD5_MAC_LEN;
988 elen[1] = MD5_MAC_LEN;
990 md5_vector(first ? 3 : 2, addr, elen, hash);
993 for (i = 0; i < MD5_MAC_LEN; i++)
994 *ppos++ = *pos++ ^ hash[i];
998 if (plain[0] == 0 || plain[0] > plen - 1) {
999 printf("Failed to decrypt MPPE key\n");
1004 res = os_malloc(plain[0]);
1009 os_memcpy(res, plain + 1, plain[0]);
1017 static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt,
1018 const u8 *req_authenticator,
1019 const u8 *secret, size_t secret_len,
1020 u8 *ebuf, size_t *elen)
1022 int i, len, first = 1;
1023 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos;
1027 WPA_PUT_BE16(saltbuf, salt);
1031 len = (len & 0xf0) + 16;
1033 os_memset(ebuf, 0, len);
1035 os_memcpy(ebuf + 1, key, key_len);
1041 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1042 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1044 _len[0] = secret_len;
1046 addr[1] = req_authenticator;
1047 _len[1] = MD5_MAC_LEN;
1049 _len[2] = sizeof(saltbuf);
1051 addr[1] = pos - MD5_MAC_LEN;
1052 _len[1] = MD5_MAC_LEN;
1054 md5_vector(first ? 3 : 2, addr, _len, hash);
1057 for (i = 0; i < MD5_MAC_LEN; i++)
1065 struct radius_ms_mppe_keys *
1066 radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
1067 const u8 *secret, size_t secret_len)
1071 struct radius_ms_mppe_keys *keys;
1073 if (msg == NULL || sent_msg == NULL)
1076 keys = os_zalloc(sizeof(*keys));
1080 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1081 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY,
1084 keys->send = decrypt_ms_key(key, keylen,
1085 sent_msg->hdr->authenticator,
1091 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1092 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY,
1095 keys->recv = decrypt_ms_key(key, keylen,
1096 sent_msg->hdr->authenticator,
1106 struct radius_ms_mppe_keys *
1107 radius_msg_get_cisco_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_CISCO,
1122 RADIUS_CISCO_AV_PAIR, &keylen);
1123 if (key && keylen == 51 &&
1124 os_memcmp(key, "leap:session-key=", 17) == 0) {
1125 keys->recv = decrypt_ms_key(key + 17, keylen - 17,
1126 sent_msg->hdr->authenticator,
1136 int radius_msg_add_mppe_keys(struct radius_msg *msg,
1137 const u8 *req_authenticator,
1138 const u8 *secret, size_t secret_len,
1139 const u8 *send_key, size_t send_key_len,
1140 const u8 *recv_key, size_t recv_key_len)
1142 struct radius_attr_hdr *attr;
1143 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT);
1145 struct radius_attr_vendor *vhdr;
1151 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2;
1153 /* MS-MPPE-Send-Key */
1154 buf = os_malloc(hlen + send_key_len + 16);
1159 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1160 pos += sizeof(vendor_id);
1161 vhdr = (struct radius_attr_vendor *) pos;
1162 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY;
1163 pos = (u8 *) (vhdr + 1);
1164 salt = os_random() | 0x8000;
1165 WPA_PUT_BE16(pos, salt);
1167 encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret,
1168 secret_len, pos, &elen);
1169 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1171 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1178 /* MS-MPPE-Recv-Key */
1179 buf = os_malloc(hlen + send_key_len + 16);
1184 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1185 pos += sizeof(vendor_id);
1186 vhdr = (struct radius_attr_vendor *) pos;
1187 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY;
1188 pos = (u8 *) (vhdr + 1);
1190 WPA_PUT_BE16(pos, salt);
1192 encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret,
1193 secret_len, pos, &elen);
1194 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1196 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1207 /* Add User-Password attribute to a RADIUS message and encrypt it as specified
1208 * in RFC 2865, Chap. 5.2 */
1209 struct radius_attr_hdr *
1210 radius_msg_add_attr_user_password(struct radius_msg *msg,
1211 const u8 *data, size_t data_len,
1212 const u8 *secret, size_t secret_len)
1215 size_t padlen, i, buf_len, pos;
1223 os_memcpy(buf, data, data_len);
1226 padlen = data_len % 16;
1227 if (padlen && data_len < sizeof(buf)) {
1228 padlen = 16 - padlen;
1229 os_memset(buf + data_len, 0, padlen);
1234 len[0] = secret_len;
1235 addr[1] = msg->hdr->authenticator;
1237 md5_vector(2, addr, len, hash);
1239 for (i = 0; i < 16; i++)
1243 while (pos < buf_len) {
1245 len[0] = secret_len;
1246 addr[1] = &buf[pos - 16];
1248 md5_vector(2, addr, len, hash);
1250 for (i = 0; i < 16; i++)
1251 buf[pos + i] ^= hash[i];
1256 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD,
1261 int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len)
1263 struct radius_attr_hdr *attr = NULL, *tmp;
1266 for (i = 0; i < msg->attr_used; i++) {
1267 tmp = radius_get_attr_hdr(msg, i);
1268 if (tmp->type == type) {
1274 if (!attr || attr->length < sizeof(*attr))
1277 dlen = attr->length - sizeof(*attr);
1279 os_memcpy(buf, (attr + 1), dlen > len ? len : dlen);
1284 int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf,
1285 size_t *len, const u8 *start)
1288 struct radius_attr_hdr *attr = NULL, *tmp;
1290 for (i = 0; i < msg->attr_used; i++) {
1291 tmp = radius_get_attr_hdr(msg, i);
1292 if (tmp->type == type &&
1293 (start == NULL || (u8 *) tmp > start)) {
1299 if (!attr || attr->length < sizeof(*attr))
1302 *buf = (u8 *) (attr + 1);
1303 *len = attr->length - sizeof(*attr);
1308 int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len)
1313 for (count = 0, i = 0; i < msg->attr_used; i++) {
1314 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
1315 if (attr->type == type &&
1316 attr->length >= sizeof(struct radius_attr_hdr) + min_len)
1324 struct radius_tunnel_attrs {
1326 int type; /* Tunnel-Type */
1327 int medium_type; /* Tunnel-Medium-Type */
1333 * radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information
1334 * @msg: RADIUS message
1335 * Returns: VLAN ID for the first tunnel configuration of -1 if none is found
1337 int radius_msg_get_vlanid(struct radius_msg *msg)
1339 struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun;
1341 struct radius_attr_hdr *attr = NULL;
1346 os_memset(&tunnel, 0, sizeof(tunnel));
1348 for (i = 0; i < msg->attr_used; i++) {
1349 attr = radius_get_attr_hdr(msg, i);
1350 if (attr->length < sizeof(*attr))
1352 data = (const u8 *) (attr + 1);
1353 dlen = attr->length - sizeof(*attr);
1354 if (attr->length < 3)
1356 if (data[0] >= RADIUS_TUNNEL_TAGS)
1359 tun = &tunnel[data[0]];
1361 switch (attr->type) {
1362 case RADIUS_ATTR_TUNNEL_TYPE:
1363 if (attr->length != 6)
1366 tun->type = WPA_GET_BE24(data + 1);
1368 case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE:
1369 if (attr->length != 6)
1372 tun->medium_type = WPA_GET_BE24(data + 1);
1374 case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID:
1375 if (data[0] < RADIUS_TUNNEL_TAGS) {
1379 if (dlen >= sizeof(buf))
1381 os_memcpy(buf, data, dlen);
1384 tun->vlanid = atoi(buf);
1389 for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) {
1391 if (tun->tag_used &&
1392 tun->type == RADIUS_TUNNEL_TYPE_VLAN &&
1393 tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 &&
1403 * radius_msg_get_tunnel_password - Parse RADIUS attribute Tunnel-Password
1404 * @msg: Received RADIUS message
1405 * @keylen: Length of returned password
1406 * @secret: RADIUS shared secret
1407 * @secret_len: Length of secret
1408 * @sent_msg: Sent RADIUS message
1409 * @n: Number of password attribute to return (starting with 0)
1410 * Returns: Pointer to n-th password (free with os_free) or %NULL
1412 char * radius_msg_get_tunnel_password(struct radius_msg *msg, int *keylen,
1413 const u8 *secret, size_t secret_len,
1414 struct radius_msg *sent_msg, size_t n)
1425 struct radius_attr_hdr *attr;
1428 const u8 *fdata = NULL; /* points to found item */
1432 /* find n-th valid Tunnel-Password attribute */
1433 for (i = 0; i < msg->attr_used; i++) {
1434 attr = radius_get_attr_hdr(msg, i);
1436 attr->type != RADIUS_ATTR_TUNNEL_PASSWORD) {
1439 if (attr->length <= 5)
1441 data = (const u8 *) (attr + 1);
1442 dlen = attr->length - sizeof(*attr);
1443 if (dlen <= 3 || dlen % 16 != 3)
1456 /* alloc writable memory for decryption */
1457 buf = os_malloc(fdlen);
1460 os_memcpy(buf, fdata, fdlen);
1467 /* decrypt blocks */
1468 pos = buf + buflen - 16; /* last block */
1469 while (pos >= str + 16) { /* all but the first block */
1471 len[0] = secret_len;
1474 md5_vector(2, addr, len, hash);
1476 for (i = 0; i < 16; i++)
1482 /* decrypt first block */
1486 len[0] = secret_len;
1487 addr[1] = sent_msg->hdr->authenticator;
1491 md5_vector(3, addr, len, hash);
1493 for (i = 0; i < 16; i++)
1496 /* derive plaintext length from first subfield */
1497 *keylen = (unsigned char) str[0];
1498 if ((u8 *) (str + *keylen) >= (u8 *) (buf + buflen)) {
1499 /* decryption error - invalid key length */
1503 /* empty password */
1507 /* copy passphrase into new buffer */
1508 ret = os_malloc(*keylen);
1510 os_memcpy(ret, str + 1, *keylen);
1513 /* return new buffer */
1519 void radius_free_class(struct radius_class_data *c)
1524 for (i = 0; i < c->count; i++)
1525 os_free(c->attr[i].data);
1532 int radius_copy_class(struct radius_class_data *dst,
1533 const struct radius_class_data *src)
1537 if (src->attr == NULL)
1540 dst->attr = os_calloc(src->count, sizeof(struct radius_attr_data));
1541 if (dst->attr == NULL)
1546 for (i = 0; i < src->count; i++) {
1547 dst->attr[i].data = os_malloc(src->attr[i].len);
1548 if (dst->attr[i].data == NULL)
1551 os_memcpy(dst->attr[i].data, src->attr[i].data,
1553 dst->attr[i].len = src->attr[i].len;
1560 u8 radius_msg_find_unlisted_attr(struct radius_msg *msg, u8 *attrs)
1563 struct radius_attr_hdr *attr;
1565 for (i = 0; i < msg->attr_used; i++) {
1566 attr = radius_get_attr_hdr(msg, i);
1568 for (j = 0; attrs[j]; j++) {
1569 if (attr->type == attrs[j])
1574 return attr->type; /* unlisted attr */