2 * hostapd / RADIUS message processing
3 * Copyright (c) 2002-2008, Jouni Malinen <j@w1.fi>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
23 static struct radius_attr_hdr *
24 radius_get_attr_hdr(struct radius_msg *msg, int idx)
26 return (struct radius_attr_hdr *) (msg->buf + msg->attr_pos[idx]);
30 struct radius_msg *radius_msg_new(u8 code, u8 identifier)
32 struct radius_msg *msg;
34 msg = os_malloc(sizeof(*msg));
38 if (radius_msg_initialize(msg, RADIUS_DEFAULT_MSG_SIZE)) {
43 radius_msg_set_hdr(msg, code, identifier);
49 int radius_msg_initialize(struct radius_msg *msg, size_t init_len)
51 if (msg == NULL || init_len < sizeof(struct radius_hdr))
54 os_memset(msg, 0, sizeof(*msg));
55 msg->buf = os_zalloc(init_len);
59 msg->buf_size = init_len;
60 msg->hdr = (struct radius_hdr *) msg->buf;
61 msg->buf_used = sizeof(*msg->hdr);
64 os_zalloc(RADIUS_DEFAULT_ATTR_COUNT * sizeof(*msg->attr_pos));
65 if (msg->attr_pos == NULL) {
72 msg->attr_size = RADIUS_DEFAULT_ATTR_COUNT;
79 void radius_msg_set_hdr(struct radius_msg *msg, u8 code, u8 identifier)
81 msg->hdr->code = code;
82 msg->hdr->identifier = identifier;
86 void radius_msg_free(struct radius_msg *msg)
91 msg->buf_size = msg->buf_used = 0;
93 os_free(msg->attr_pos);
95 msg->attr_size = msg->attr_used = 0;
99 static const char *radius_code_string(u8 code)
102 case RADIUS_CODE_ACCESS_REQUEST: return "Access-Request";
103 case RADIUS_CODE_ACCESS_ACCEPT: return "Access-Accept";
104 case RADIUS_CODE_ACCESS_REJECT: return "Access-Reject";
105 case RADIUS_CODE_ACCOUNTING_REQUEST: return "Accounting-Request";
106 case RADIUS_CODE_ACCOUNTING_RESPONSE: return "Accounting-Response";
107 case RADIUS_CODE_ACCESS_CHALLENGE: return "Access-Challenge";
108 case RADIUS_CODE_STATUS_SERVER: return "Status-Server";
109 case RADIUS_CODE_STATUS_CLIENT: return "Status-Client";
110 case RADIUS_CODE_RESERVED: return "Reserved";
111 default: return "?Unknown?";
116 struct radius_attr_type {
120 RADIUS_ATTR_UNDIST, RADIUS_ATTR_TEXT, RADIUS_ATTR_IP,
121 RADIUS_ATTR_HEXDUMP, RADIUS_ATTR_INT32, RADIUS_ATTR_IPV6
125 static struct radius_attr_type radius_attrs[] =
127 { RADIUS_ATTR_USER_NAME, "User-Name", RADIUS_ATTR_TEXT },
128 { RADIUS_ATTR_USER_PASSWORD, "User-Password", RADIUS_ATTR_UNDIST },
129 { RADIUS_ATTR_NAS_IP_ADDRESS, "NAS-IP-Address", RADIUS_ATTR_IP },
130 { RADIUS_ATTR_NAS_PORT, "NAS-Port", RADIUS_ATTR_INT32 },
131 { RADIUS_ATTR_FRAMED_MTU, "Framed-MTU", RADIUS_ATTR_INT32 },
132 { RADIUS_ATTR_REPLY_MESSAGE, "Reply-Message", RADIUS_ATTR_TEXT },
133 { RADIUS_ATTR_STATE, "State", RADIUS_ATTR_UNDIST },
134 { RADIUS_ATTR_CLASS, "Class", RADIUS_ATTR_UNDIST },
135 { RADIUS_ATTR_VENDOR_SPECIFIC, "Vendor-Specific", RADIUS_ATTR_UNDIST },
136 { RADIUS_ATTR_SESSION_TIMEOUT, "Session-Timeout", RADIUS_ATTR_INT32 },
137 { RADIUS_ATTR_IDLE_TIMEOUT, "Idle-Timeout", RADIUS_ATTR_INT32 },
138 { RADIUS_ATTR_TERMINATION_ACTION, "Termination-Action",
140 { RADIUS_ATTR_CALLED_STATION_ID, "Called-Station-Id",
142 { RADIUS_ATTR_CALLING_STATION_ID, "Calling-Station-Id",
144 { RADIUS_ATTR_NAS_IDENTIFIER, "NAS-Identifier", RADIUS_ATTR_TEXT },
145 { RADIUS_ATTR_PROXY_STATE, "Proxy-State", RADIUS_ATTR_UNDIST },
146 { RADIUS_ATTR_ACCT_STATUS_TYPE, "Acct-Status-Type",
148 { RADIUS_ATTR_ACCT_DELAY_TIME, "Acct-Delay-Time", RADIUS_ATTR_INT32 },
149 { RADIUS_ATTR_ACCT_INPUT_OCTETS, "Acct-Input-Octets",
151 { RADIUS_ATTR_ACCT_OUTPUT_OCTETS, "Acct-Output-Octets",
153 { RADIUS_ATTR_ACCT_SESSION_ID, "Acct-Session-Id", RADIUS_ATTR_TEXT },
154 { RADIUS_ATTR_ACCT_AUTHENTIC, "Acct-Authentic", RADIUS_ATTR_INT32 },
155 { RADIUS_ATTR_ACCT_SESSION_TIME, "Acct-Session-Time",
157 { RADIUS_ATTR_ACCT_INPUT_PACKETS, "Acct-Input-Packets",
159 { RADIUS_ATTR_ACCT_OUTPUT_PACKETS, "Acct-Output-Packets",
161 { RADIUS_ATTR_ACCT_TERMINATE_CAUSE, "Acct-Terminate-Cause",
163 { RADIUS_ATTR_ACCT_MULTI_SESSION_ID, "Acct-Multi-Session-Id",
165 { RADIUS_ATTR_ACCT_LINK_COUNT, "Acct-Link-Count", RADIUS_ATTR_INT32 },
166 { RADIUS_ATTR_ACCT_INPUT_GIGAWORDS, "Acct-Input-Gigawords",
168 { RADIUS_ATTR_ACCT_OUTPUT_GIGAWORDS, "Acct-Output-Gigawords",
170 { RADIUS_ATTR_EVENT_TIMESTAMP, "Event-Timestamp",
172 { RADIUS_ATTR_NAS_PORT_TYPE, "NAS-Port-Type", RADIUS_ATTR_INT32 },
173 { RADIUS_ATTR_TUNNEL_TYPE, "Tunnel-Type", RADIUS_ATTR_HEXDUMP },
174 { RADIUS_ATTR_TUNNEL_MEDIUM_TYPE, "Tunnel-Medium-Type",
175 RADIUS_ATTR_HEXDUMP },
176 { RADIUS_ATTR_CONNECT_INFO, "Connect-Info", RADIUS_ATTR_TEXT },
177 { RADIUS_ATTR_EAP_MESSAGE, "EAP-Message", RADIUS_ATTR_UNDIST },
178 { RADIUS_ATTR_MESSAGE_AUTHENTICATOR, "Message-Authenticator",
179 RADIUS_ATTR_UNDIST },
180 { RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID, "Tunnel-Private-Group-Id",
181 RADIUS_ATTR_HEXDUMP },
182 { RADIUS_ATTR_ACCT_INTERIM_INTERVAL, "Acct-Interim-Interval",
184 { RADIUS_ATTR_NAS_IPV6_ADDRESS, "NAS-IPv6-Address", RADIUS_ATTR_IPV6 },
186 #define RADIUS_ATTRS (sizeof(radius_attrs) / sizeof(radius_attrs[0]))
189 static struct radius_attr_type *radius_get_attr_type(u8 type)
193 for (i = 0; i < RADIUS_ATTRS; i++) {
194 if (type == radius_attrs[i].type)
195 return &radius_attrs[i];
202 static void print_char(char c)
204 if (c >= 32 && c < 127)
211 static void radius_msg_dump_attr(struct radius_attr_hdr *hdr)
213 struct radius_attr_type *attr;
217 attr = radius_get_attr_type(hdr->type);
219 printf(" Attribute %d (%s) length=%d\n",
220 hdr->type, attr ? attr->name : "?Unknown?", hdr->length);
225 len = hdr->length - sizeof(struct radius_attr_hdr);
226 pos = (unsigned char *) (hdr + 1);
228 switch (attr->data_type) {
229 case RADIUS_ATTR_TEXT:
231 for (i = 0; i < len; i++)
239 os_memcpy(&addr, pos, 4);
240 printf(" Value: %s\n", inet_ntoa(addr));
242 printf(" Invalid IP address length %d\n", len);
246 case RADIUS_ATTR_IPV6:
250 struct in6_addr *addr = (struct in6_addr *) pos;
251 atxt = inet_ntop(AF_INET6, addr, buf, sizeof(buf));
252 printf(" Value: %s\n", atxt ? atxt : "?");
254 printf(" Invalid IPv6 address length %d\n", len);
256 #endif /* CONFIG_IPV6 */
258 case RADIUS_ATTR_HEXDUMP:
259 case RADIUS_ATTR_UNDIST:
261 for (i = 0; i < len; i++)
262 printf(" %02x", pos[i]);
266 case RADIUS_ATTR_INT32:
268 printf(" Value: %u\n", WPA_GET_BE32(pos));
270 printf(" Invalid INT32 length %d\n", len);
279 void radius_msg_dump(struct radius_msg *msg)
283 printf("RADIUS message: code=%d (%s) identifier=%d length=%d\n",
284 msg->hdr->code, radius_code_string(msg->hdr->code),
285 msg->hdr->identifier, ntohs(msg->hdr->length));
287 for (i = 0; i < msg->attr_used; i++) {
288 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
289 radius_msg_dump_attr(attr);
294 int radius_msg_finish(struct radius_msg *msg, u8 *secret, size_t secret_len)
297 u8 auth[MD5_MAC_LEN];
298 struct radius_attr_hdr *attr;
300 os_memset(auth, 0, MD5_MAC_LEN);
301 attr = radius_msg_add_attr(msg,
302 RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
305 printf("WARNING: Could not add "
306 "Message-Authenticator\n");
309 msg->hdr->length = htons(msg->buf_used);
310 hmac_md5(secret, secret_len, msg->buf, msg->buf_used,
313 msg->hdr->length = htons(msg->buf_used);
315 if (msg->buf_used > 0xffff) {
316 printf("WARNING: too long RADIUS message (%lu)\n",
317 (unsigned long) msg->buf_used);
324 int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret,
325 size_t secret_len, const u8 *req_authenticator)
327 u8 auth[MD5_MAC_LEN];
328 struct radius_attr_hdr *attr;
332 os_memset(auth, 0, MD5_MAC_LEN);
333 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
336 printf("WARNING: Could not add Message-Authenticator\n");
339 msg->hdr->length = htons(msg->buf_used);
340 os_memcpy(msg->hdr->authenticator, req_authenticator,
341 sizeof(msg->hdr->authenticator));
342 hmac_md5(secret, secret_len, msg->buf, msg->buf_used,
345 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
346 addr[0] = (u8 *) msg->hdr;
348 addr[1] = req_authenticator;
349 len[1] = MD5_MAC_LEN;
350 addr[2] = (u8 *) (msg->hdr + 1);
351 len[2] = msg->buf_used - sizeof(*msg->hdr);
354 md5_vector(4, addr, len, msg->hdr->authenticator);
356 if (msg->buf_used > 0xffff) {
357 printf("WARNING: too long RADIUS message (%lu)\n",
358 (unsigned long) msg->buf_used);
365 void radius_msg_finish_acct(struct radius_msg *msg, u8 *secret,
371 msg->hdr->length = htons(msg->buf_used);
372 os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN);
374 len[0] = msg->buf_used;
377 md5_vector(2, addr, len, msg->hdr->authenticator);
379 if (msg->buf_used > 0xffff) {
380 printf("WARNING: too long RADIUS messages (%lu)\n",
381 (unsigned long) msg->buf_used);
386 static int radius_msg_add_attr_to_array(struct radius_msg *msg,
387 struct radius_attr_hdr *attr)
389 if (msg->attr_used >= msg->attr_size) {
391 int nlen = msg->attr_size * 2;
393 nattr_pos = os_realloc(msg->attr_pos,
394 nlen * sizeof(*msg->attr_pos));
395 if (nattr_pos == NULL)
398 msg->attr_pos = nattr_pos;
399 msg->attr_size = nlen;
402 msg->attr_pos[msg->attr_used++] = (unsigned char *) attr - msg->buf;
408 struct radius_attr_hdr *radius_msg_add_attr(struct radius_msg *msg, u8 type,
409 const u8 *data, size_t data_len)
412 struct radius_attr_hdr *attr;
414 if (data_len > RADIUS_MAX_ATTR_LEN) {
415 printf("radius_msg_add_attr: too long attribute (%lu bytes)\n",
416 (unsigned long) data_len);
420 buf_needed = msg->buf_used + sizeof(*attr) + data_len;
422 if (msg->buf_size < buf_needed) {
423 /* allocate more space for message buffer */
425 size_t nlen = msg->buf_size;
427 while (nlen < buf_needed)
429 nbuf = os_realloc(msg->buf, nlen);
433 msg->hdr = (struct radius_hdr *) msg->buf;
434 os_memset(msg->buf + msg->buf_size, 0, nlen - msg->buf_size);
435 msg->buf_size = nlen;
438 attr = (struct radius_attr_hdr *) (msg->buf + msg->buf_used);
440 attr->length = sizeof(*attr) + data_len;
442 os_memcpy(attr + 1, data, data_len);
444 msg->buf_used += sizeof(*attr) + data_len;
446 if (radius_msg_add_attr_to_array(msg, attr))
453 struct radius_msg *radius_msg_parse(const u8 *data, size_t len)
455 struct radius_msg *msg;
456 struct radius_hdr *hdr;
457 struct radius_attr_hdr *attr;
459 unsigned char *pos, *end;
461 if (data == NULL || len < sizeof(*hdr))
464 hdr = (struct radius_hdr *) data;
466 msg_len = ntohs(hdr->length);
467 if (msg_len < sizeof(*hdr) || msg_len > len) {
468 printf("Invalid RADIUS message length\n");
473 printf("Ignored %lu extra bytes after RADIUS message\n",
474 (unsigned long) len - msg_len);
477 msg = os_malloc(sizeof(*msg));
481 if (radius_msg_initialize(msg, msg_len)) {
486 os_memcpy(msg->buf, data, msg_len);
487 msg->buf_size = msg->buf_used = msg_len;
489 /* parse attributes */
490 pos = (unsigned char *) (msg->hdr + 1);
491 end = msg->buf + msg->buf_used;
493 if ((size_t) (end - pos) < sizeof(*attr))
496 attr = (struct radius_attr_hdr *) pos;
498 if (pos + attr->length > end || attr->length < sizeof(*attr))
501 /* TODO: check that attr->length is suitable for attr->type */
503 if (radius_msg_add_attr_to_array(msg, attr))
512 radius_msg_free(msg);
518 int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len)
520 const u8 *pos = data;
521 size_t left = data_len;
525 if (left > RADIUS_MAX_ATTR_LEN)
526 len = RADIUS_MAX_ATTR_LEN;
530 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE,
542 u8 *radius_msg_get_eap(struct radius_msg *msg, size_t *eap_len)
546 struct radius_attr_hdr *attr;
552 for (i = 0; i < msg->attr_used; i++) {
553 attr = radius_get_attr_hdr(msg, i);
554 if (attr->type == RADIUS_ATTR_EAP_MESSAGE)
555 len += attr->length - sizeof(struct radius_attr_hdr);
561 eap = os_malloc(len);
566 for (i = 0; i < msg->attr_used; i++) {
567 attr = radius_get_attr_hdr(msg, i);
568 if (attr->type == RADIUS_ATTR_EAP_MESSAGE) {
569 int flen = attr->length - sizeof(*attr);
570 os_memcpy(pos, attr + 1, flen);
582 int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret,
583 size_t secret_len, const u8 *req_auth)
585 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
586 u8 orig_authenticator[16];
587 struct radius_attr_hdr *attr = NULL, *tmp;
590 for (i = 0; i < msg->attr_used; i++) {
591 tmp = radius_get_attr_hdr(msg, i);
592 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
594 printf("Multiple Message-Authenticator "
595 "attributes in RADIUS message\n");
603 printf("No Message-Authenticator attribute found\n");
607 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
608 os_memset(attr + 1, 0, MD5_MAC_LEN);
610 os_memcpy(orig_authenticator, msg->hdr->authenticator,
611 sizeof(orig_authenticator));
612 os_memcpy(msg->hdr->authenticator, req_auth,
613 sizeof(msg->hdr->authenticator));
615 hmac_md5(secret, secret_len, msg->buf, msg->buf_used, auth);
616 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
618 os_memcpy(msg->hdr->authenticator, orig_authenticator,
619 sizeof(orig_authenticator));
622 if (os_memcmp(orig, auth, MD5_MAC_LEN) != 0) {
623 printf("Invalid Message-Authenticator!\n");
631 int radius_msg_verify(struct radius_msg *msg, const u8 *secret,
632 size_t secret_len, struct radius_msg *sent_msg, int auth)
636 u8 hash[MD5_MAC_LEN];
638 if (sent_msg == NULL) {
639 printf("No matching Access-Request message found\n");
644 radius_msg_verify_msg_auth(msg, secret, secret_len,
645 sent_msg->hdr->authenticator)) {
649 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
650 addr[0] = (u8 *) msg->hdr;
652 addr[1] = sent_msg->hdr->authenticator;
653 len[1] = MD5_MAC_LEN;
654 addr[2] = (u8 *) (msg->hdr + 1);
655 len[2] = msg->buf_used - sizeof(*msg->hdr);
658 md5_vector(4, addr, len, hash);
659 if (os_memcmp(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) {
660 printf("Response Authenticator invalid!\n");
668 int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src,
671 struct radius_attr_hdr *attr;
675 for (i = 0; i < src->attr_used; i++) {
676 attr = radius_get_attr_hdr(src, i);
677 if (attr->type == type) {
678 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1),
679 attr->length - sizeof(*attr)))
689 /* Create Request Authenticator. The value should be unique over the lifetime
690 * of the shared secret between authenticator and authentication server.
691 * Use one-way MD5 hash calculated from current timestamp and some data given
693 void radius_msg_make_authenticator(struct radius_msg *msg,
694 const u8 *data, size_t len)
703 addr[0] = (u8 *) &tv;
704 elen[0] = sizeof(tv);
709 md5_vector(3, addr, elen, msg->hdr->authenticator);
713 /* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message.
714 * Returns the Attribute payload and sets alen to indicate the length of the
715 * payload if a vendor attribute with subtype is found, otherwise returns NULL.
716 * The returned payload is allocated with os_malloc() and caller must free it
717 * by calling os_free().
719 static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor,
720 u8 subtype, size_t *alen)
728 for (i = 0; i < msg->attr_used; i++) {
729 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
732 struct radius_attr_vendor *vhdr;
734 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC)
737 left = attr->length - sizeof(*attr);
741 pos = (u8 *) (attr + 1);
743 os_memcpy(&vendor_id, pos, 4);
747 if (ntohl(vendor_id) != vendor)
750 while (left >= sizeof(*vhdr)) {
751 vhdr = (struct radius_attr_vendor *) pos;
752 if (vhdr->vendor_length > left ||
753 vhdr->vendor_length < sizeof(*vhdr)) {
757 if (vhdr->vendor_type != subtype) {
758 pos += vhdr->vendor_length;
759 left -= vhdr->vendor_length;
763 len = vhdr->vendor_length - sizeof(*vhdr);
764 data = os_malloc(len);
767 os_memcpy(data, pos + sizeof(*vhdr), len);
778 static u8 * decrypt_ms_key(const u8 *key, size_t len,
779 const u8 *req_authenticator,
780 const u8 *secret, size_t secret_len, size_t *reslen)
782 u8 *plain, *ppos, *res;
785 u8 hash[MD5_MAC_LEN];
790 /* key: 16-bit salt followed by encrypted key info */
798 printf("Invalid ms key len %lu\n", (unsigned long) left);
803 ppos = plain = os_malloc(plen);
808 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
809 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
812 elen[0] = secret_len;
814 addr[1] = req_authenticator;
815 elen[1] = MD5_MAC_LEN;
817 elen[2] = 2; /* Salt */
819 addr[1] = pos - MD5_MAC_LEN;
820 elen[1] = MD5_MAC_LEN;
822 md5_vector(first ? 3 : 2, addr, elen, hash);
825 for (i = 0; i < MD5_MAC_LEN; i++)
826 *ppos++ = *pos++ ^ hash[i];
830 if (plain[0] > plen - 1) {
831 printf("Failed to decrypt MPPE key\n");
836 res = os_malloc(plain[0]);
841 os_memcpy(res, plain + 1, plain[0]);
849 static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt,
850 const u8 *req_authenticator,
851 const u8 *secret, size_t secret_len,
852 u8 *ebuf, size_t *elen)
854 int i, len, first = 1;
855 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos;
859 WPA_PUT_BE16(saltbuf, salt);
863 len = (len & 0xf0) + 16;
865 os_memset(ebuf, 0, len);
867 os_memcpy(ebuf + 1, key, key_len);
873 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
874 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
876 _len[0] = secret_len;
878 addr[1] = req_authenticator;
879 _len[1] = MD5_MAC_LEN;
881 _len[2] = sizeof(saltbuf);
883 addr[1] = pos - MD5_MAC_LEN;
884 _len[1] = MD5_MAC_LEN;
886 md5_vector(first ? 3 : 2, addr, _len, hash);
889 for (i = 0; i < MD5_MAC_LEN; i++)
897 struct radius_ms_mppe_keys *
898 radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
899 u8 *secret, size_t secret_len)
903 struct radius_ms_mppe_keys *keys;
905 if (msg == NULL || sent_msg == NULL)
908 keys = os_zalloc(sizeof(*keys));
912 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
913 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY,
916 keys->send = decrypt_ms_key(key, keylen,
917 sent_msg->hdr->authenticator,
923 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
924 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY,
927 keys->recv = decrypt_ms_key(key, keylen,
928 sent_msg->hdr->authenticator,
938 struct radius_ms_mppe_keys *
939 radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
940 u8 *secret, size_t secret_len)
944 struct radius_ms_mppe_keys *keys;
946 if (msg == NULL || sent_msg == NULL)
949 keys = os_zalloc(sizeof(*keys));
953 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO,
954 RADIUS_CISCO_AV_PAIR, &keylen);
955 if (key && keylen == 51 &&
956 os_memcmp(key, "leap:session-key=", 17) == 0) {
957 keys->recv = decrypt_ms_key(key + 17, keylen - 17,
958 sent_msg->hdr->authenticator,
968 int radius_msg_add_mppe_keys(struct radius_msg *msg,
969 const u8 *req_authenticator,
970 const u8 *secret, size_t secret_len,
971 const u8 *send_key, size_t send_key_len,
972 const u8 *recv_key, size_t recv_key_len)
974 struct radius_attr_hdr *attr;
975 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT);
977 struct radius_attr_vendor *vhdr;
983 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2;
985 /* MS-MPPE-Send-Key */
986 buf = os_malloc(hlen + send_key_len + 16);
991 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
992 pos += sizeof(vendor_id);
993 vhdr = (struct radius_attr_vendor *) pos;
994 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY;
995 pos = (u8 *) (vhdr + 1);
996 salt = os_random() | 0x8000;
997 WPA_PUT_BE16(pos, salt);
999 encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret,
1000 secret_len, pos, &elen);
1001 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1003 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1010 /* MS-MPPE-Recv-Key */
1011 buf = os_malloc(hlen + send_key_len + 16);
1016 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1017 pos += sizeof(vendor_id);
1018 vhdr = (struct radius_attr_vendor *) pos;
1019 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY;
1020 pos = (u8 *) (vhdr + 1);
1022 WPA_PUT_BE16(pos, salt);
1024 encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret,
1025 secret_len, pos, &elen);
1026 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1028 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1039 /* Add User-Password attribute to a RADIUS message and encrypt it as specified
1040 * in RFC 2865, Chap. 5.2 */
1041 struct radius_attr_hdr *
1042 radius_msg_add_attr_user_password(struct radius_msg *msg,
1043 u8 *data, size_t data_len,
1044 u8 *secret, size_t secret_len)
1048 size_t buf_len, pos;
1056 os_memcpy(buf, data, data_len);
1059 padlen = data_len % 16;
1061 padlen = 16 - padlen;
1062 os_memset(buf + data_len, 0, padlen);
1067 len[0] = secret_len;
1068 addr[1] = msg->hdr->authenticator;
1070 md5_vector(2, addr, len, hash);
1072 for (i = 0; i < 16; i++)
1076 while (pos < buf_len) {
1078 len[0] = secret_len;
1079 addr[1] = &buf[pos - 16];
1081 md5_vector(2, addr, len, hash);
1083 for (i = 0; i < 16; i++)
1084 buf[pos + i] ^= hash[i];
1089 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD,
1094 int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len)
1096 struct radius_attr_hdr *attr = NULL, *tmp;
1099 for (i = 0; i < msg->attr_used; i++) {
1100 tmp = radius_get_attr_hdr(msg, i);
1101 if (tmp->type == type) {
1110 dlen = attr->length - sizeof(*attr);
1112 os_memcpy(buf, (attr + 1), dlen > len ? len : dlen);
1117 int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf,
1118 size_t *len, const u8 *start)
1121 struct radius_attr_hdr *attr = NULL, *tmp;
1123 for (i = 0; i < msg->attr_used; i++) {
1124 tmp = radius_get_attr_hdr(msg, i);
1125 if (tmp->type == type &&
1126 (start == NULL || (u8 *) tmp > start)) {
1135 *buf = (u8 *) (attr + 1);
1136 *len = attr->length - sizeof(*attr);
1141 int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len)
1146 for (count = 0, i = 0; i < msg->attr_used; i++) {
1147 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
1148 if (attr->type == type &&
1149 attr->length >= sizeof(struct radius_attr_hdr) + min_len)
1157 struct radius_tunnel_attrs {
1159 int type; /* Tunnel-Type */
1160 int medium_type; /* Tunnel-Medium-Type */
1166 * radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information
1167 * @msg: RADIUS message
1168 * Returns: VLAN ID for the first tunnel configuration of -1 if none is found
1170 int radius_msg_get_vlanid(struct radius_msg *msg)
1172 struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun;
1174 struct radius_attr_hdr *attr = NULL;
1179 os_memset(&tunnel, 0, sizeof(tunnel));
1181 for (i = 0; i < msg->attr_used; i++) {
1182 attr = radius_get_attr_hdr(msg, i);
1183 data = (const u8 *) (attr + 1);
1184 dlen = attr->length - sizeof(*attr);
1185 if (attr->length < 3)
1187 if (data[0] >= RADIUS_TUNNEL_TAGS)
1190 tun = &tunnel[data[0]];
1192 switch (attr->type) {
1193 case RADIUS_ATTR_TUNNEL_TYPE:
1194 if (attr->length != 6)
1197 tun->type = WPA_GET_BE24(data + 1);
1199 case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE:
1200 if (attr->length != 6)
1203 tun->medium_type = WPA_GET_BE24(data + 1);
1205 case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID:
1206 if (data[0] < RADIUS_TUNNEL_TAGS) {
1210 if (dlen >= sizeof(buf))
1212 os_memcpy(buf, data, dlen);
1215 tun->vlanid = atoi(buf);
1220 for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) {
1222 if (tun->tag_used &&
1223 tun->type == RADIUS_TUNNEL_TYPE_VLAN &&
1224 tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 &&