2 * Host AP (software wireless LAN access point) user space daemon for
3 * Host AP kernel driver / RADIUS client
4 * Copyright (c) 2002-2005, Jouni Malinen <jkmaline@cc.hut.fi>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * Alternatively, this software may be distributed under the terms of BSD
13 * See README and COPYING for more details.
22 #ifndef CONFIG_NATIVE_WINDOWS
23 #include <netinet/in.h>
24 #include <sys/ioctl.h>
25 #include <sys/socket.h>
26 #include <arpa/inet.h>
27 #endif /* CONFIG_NATIVE_WINDOWS */
35 struct radius_msg *radius_msg_new(u8 code, u8 identifier)
37 struct radius_msg *msg;
39 msg = (struct radius_msg *) malloc(sizeof(*msg));
43 if (radius_msg_initialize(msg, RADIUS_DEFAULT_MSG_SIZE)) {
48 radius_msg_set_hdr(msg, code, identifier);
54 int radius_msg_initialize(struct radius_msg *msg, size_t init_len)
56 if (msg == NULL || init_len < sizeof(struct radius_hdr))
59 memset(msg, 0, sizeof(*msg));
60 msg->buf = (unsigned char *) malloc(init_len);
63 memset(msg->buf, 0, init_len);
65 msg->buf_size = init_len;
66 msg->hdr = (struct radius_hdr *) msg->buf;
67 msg->buf_used = sizeof(*msg->hdr);
69 msg->attrs = (struct radius_attr_hdr **)
70 malloc(RADIUS_DEFAULT_ATTR_COUNT * sizeof(*msg->attrs));
71 if (msg->attrs == NULL) {
78 msg->attr_size = RADIUS_DEFAULT_ATTR_COUNT;
85 void radius_msg_set_hdr(struct radius_msg *msg, u8 code, u8 identifier)
87 msg->hdr->code = code;
88 msg->hdr->identifier = identifier;
92 void radius_msg_free(struct radius_msg *msg)
94 if (msg->buf != NULL) {
99 msg->buf_size = msg->buf_used = 0;
101 if (msg->attrs != NULL) {
105 msg->attr_size = msg->attr_used = 0;
109 static const char *radius_code_string(u8 code)
112 case RADIUS_CODE_ACCESS_REQUEST: return "Access-Request";
113 case RADIUS_CODE_ACCESS_ACCEPT: return "Access-Accept";
114 case RADIUS_CODE_ACCESS_REJECT: return "Access-Reject";
115 case RADIUS_CODE_ACCOUNTING_REQUEST: return "Accounting-Request";
116 case RADIUS_CODE_ACCOUNTING_RESPONSE: return "Accounting-Response";
117 case RADIUS_CODE_ACCESS_CHALLENGE: return "Access-Challenge";
118 case RADIUS_CODE_STATUS_SERVER: return "Status-Server";
119 case RADIUS_CODE_STATUS_CLIENT: return "Status-Client";
120 case RADIUS_CODE_RESERVED: return "Reserved";
121 default: return "?Unknown?";
126 struct radius_attr_type {
130 RADIUS_ATTR_UNDIST, RADIUS_ATTR_TEXT, RADIUS_ATTR_IP,
131 RADIUS_ATTR_HEXDUMP, RADIUS_ATTR_INT32, RADIUS_ATTR_IPV6
135 static struct radius_attr_type radius_attrs[] =
137 { RADIUS_ATTR_USER_NAME, "User-Name", RADIUS_ATTR_TEXT },
138 { RADIUS_ATTR_USER_PASSWORD, "User-Password", RADIUS_ATTR_UNDIST },
139 { RADIUS_ATTR_NAS_IP_ADDRESS, "NAS-IP-Address", RADIUS_ATTR_IP },
140 { RADIUS_ATTR_NAS_PORT, "NAS-Port", RADIUS_ATTR_INT32 },
141 { RADIUS_ATTR_FRAMED_MTU, "Framed-MTU", RADIUS_ATTR_INT32 },
142 { RADIUS_ATTR_STATE, "State", RADIUS_ATTR_UNDIST },
143 { RADIUS_ATTR_CLASS, "Class", RADIUS_ATTR_UNDIST },
144 { RADIUS_ATTR_VENDOR_SPECIFIC, "Vendor-Specific", RADIUS_ATTR_UNDIST },
145 { RADIUS_ATTR_SESSION_TIMEOUT, "Session-Timeout", RADIUS_ATTR_INT32 },
146 { RADIUS_ATTR_IDLE_TIMEOUT, "Idle-Timeout", RADIUS_ATTR_INT32 },
147 { RADIUS_ATTR_TERMINATION_ACTION, "Termination-Action",
149 { RADIUS_ATTR_CALLED_STATION_ID, "Called-Station-Id",
151 { RADIUS_ATTR_CALLING_STATION_ID, "Calling-Station-Id",
153 { RADIUS_ATTR_NAS_IDENTIFIER, "NAS-Identifier", RADIUS_ATTR_TEXT },
154 { RADIUS_ATTR_ACCT_STATUS_TYPE, "Acct-Status-Type",
156 { RADIUS_ATTR_ACCT_DELAY_TIME, "Acct-Delay-Time", RADIUS_ATTR_INT32 },
157 { RADIUS_ATTR_ACCT_INPUT_OCTETS, "Acct-Input-Octets",
159 { RADIUS_ATTR_ACCT_OUTPUT_OCTETS, "Acct-Output-Octets",
161 { RADIUS_ATTR_ACCT_SESSION_ID, "Acct-Session-Id", RADIUS_ATTR_TEXT },
162 { RADIUS_ATTR_ACCT_AUTHENTIC, "Acct-Authentic", RADIUS_ATTR_INT32 },
163 { RADIUS_ATTR_ACCT_SESSION_TIME, "Acct-Session-Time",
165 { RADIUS_ATTR_ACCT_INPUT_PACKETS, "Acct-Input-Packets",
167 { RADIUS_ATTR_ACCT_OUTPUT_PACKETS, "Acct-Output-Packets",
169 { RADIUS_ATTR_ACCT_TERMINATE_CAUSE, "Acct-Terminate-Cause",
171 { RADIUS_ATTR_ACCT_MULTI_SESSION_ID, "Acct-Multi-Session-Id",
173 { RADIUS_ATTR_ACCT_LINK_COUNT, "Acct-Link-Count", RADIUS_ATTR_INT32 },
174 { RADIUS_ATTR_ACCT_INPUT_GIGAWORDS, "Acct-Input-Gigawords",
176 { RADIUS_ATTR_ACCT_OUTPUT_GIGAWORDS, "Acct-Output-Gigawords",
178 { RADIUS_ATTR_EVENT_TIMESTAMP, "Event-Timestamp",
180 { RADIUS_ATTR_NAS_PORT_TYPE, "NAS-Port-Type", RADIUS_ATTR_INT32 },
181 { RADIUS_ATTR_CONNECT_INFO, "Connect-Info", RADIUS_ATTR_TEXT },
182 { RADIUS_ATTR_EAP_MESSAGE, "EAP-Message", RADIUS_ATTR_UNDIST },
183 { RADIUS_ATTR_MESSAGE_AUTHENTICATOR, "Message-Authenticator",
184 RADIUS_ATTR_UNDIST },
185 { RADIUS_ATTR_ACCT_INTERIM_INTERVAL, "Acct-Interim-Interval",
187 { RADIUS_ATTR_NAS_IPV6_ADDRESS, "NAS-IPv6-Address", RADIUS_ATTR_IPV6 },
189 #define RADIUS_ATTRS (sizeof(radius_attrs) / sizeof(radius_attrs[0]))
192 static struct radius_attr_type *radius_get_attr_type(u8 type)
196 for (i = 0; i < RADIUS_ATTRS; i++) {
197 if (type == radius_attrs[i].type)
198 return &radius_attrs[i];
205 static void radius_msg_dump_attr(struct radius_attr_hdr *hdr)
207 struct radius_attr_type *attr;
211 attr = radius_get_attr_type(hdr->type);
213 printf(" Attribute %d (%s) length=%d\n",
214 hdr->type, attr ? attr->name : "?Unknown?", hdr->length);
219 len = hdr->length - sizeof(struct radius_attr_hdr);
220 pos = (unsigned char *) (hdr + 1);
222 switch (attr->data_type) {
223 case RADIUS_ATTR_TEXT:
225 for (i = 0; i < len; i++)
232 struct in_addr *addr = (struct in_addr *) pos;
233 printf(" Value: %s\n", inet_ntoa(*addr));
235 printf(" Invalid IP address length %d\n", len);
239 case RADIUS_ATTR_IPV6:
243 struct in6_addr *addr = (struct in6_addr *) pos;
244 atxt = inet_ntop(AF_INET6, addr, buf, sizeof(buf));
245 printf(" Value: %s\n", atxt ? atxt : "?");
247 printf(" Invalid IPv6 address length %d\n", len);
249 #endif /* CONFIG_IPV6 */
251 case RADIUS_ATTR_HEXDUMP:
252 case RADIUS_ATTR_UNDIST:
254 for (i = 0; i < len; i++)
255 printf(" %02x", pos[i]);
259 case RADIUS_ATTR_INT32:
261 printf(" Value: %u\n", WPA_GET_BE32(pos));
263 printf(" Invalid INT32 length %d\n", len);
272 void radius_msg_dump(struct radius_msg *msg)
276 printf("RADIUS message: code=%d (%s) identifier=%d length=%d\n",
277 msg->hdr->code, radius_code_string(msg->hdr->code),
278 msg->hdr->identifier, ntohs(msg->hdr->length));
280 for (i = 0; i < msg->attr_used; i++) {
281 radius_msg_dump_attr(msg->attrs[i]);
286 int radius_msg_finish(struct radius_msg *msg, u8 *secret, size_t secret_len)
289 u8 auth[MD5_MAC_LEN];
290 struct radius_attr_hdr *attr;
292 memset(auth, 0, MD5_MAC_LEN);
293 attr = radius_msg_add_attr(msg,
294 RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
297 printf("WARNING: Could not add "
298 "Message-Authenticator\n");
301 msg->hdr->length = htons(msg->buf_used);
302 hmac_md5(secret, secret_len, msg->buf, msg->buf_used,
305 msg->hdr->length = htons(msg->buf_used);
307 if (msg->buf_used > 0xffff) {
308 printf("WARNING: too long RADIUS message (%lu)\n",
309 (unsigned long) msg->buf_used);
316 int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret,
317 size_t secret_len, const u8 *req_authenticator)
319 u8 auth[MD5_MAC_LEN];
320 struct radius_attr_hdr *attr;
324 memset(auth, 0, MD5_MAC_LEN);
325 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
328 printf("WARNING: Could not add Message-Authenticator\n");
331 msg->hdr->length = htons(msg->buf_used);
332 memcpy(msg->hdr->authenticator, req_authenticator,
333 sizeof(msg->hdr->authenticator));
334 hmac_md5(secret, secret_len, msg->buf, msg->buf_used,
337 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
338 addr[0] = (u8 *) msg->hdr;
340 addr[1] = req_authenticator;
341 len[1] = MD5_MAC_LEN;
342 addr[2] = (u8 *) (msg->hdr + 1);
343 len[2] = msg->buf_used - sizeof(*msg->hdr);
346 md5_vector(4, addr, len, msg->hdr->authenticator);
348 if (msg->buf_used > 0xffff) {
349 printf("WARNING: too long RADIUS message (%lu)\n",
350 (unsigned long) msg->buf_used);
357 void radius_msg_finish_acct(struct radius_msg *msg, u8 *secret,
363 msg->hdr->length = htons(msg->buf_used);
364 memset(msg->hdr->authenticator, 0, MD5_MAC_LEN);
366 len[0] = msg->buf_used;
369 md5_vector(2, addr, len, msg->hdr->authenticator);
371 if (msg->buf_used > 0xffff) {
372 printf("WARNING: too long RADIUS messages (%lu)\n",
373 (unsigned long) msg->buf_used);
378 static int radius_msg_add_attr_to_array(struct radius_msg *msg,
379 struct radius_attr_hdr *attr)
381 if (msg->attr_used >= msg->attr_size) {
382 struct radius_attr_hdr **nattrs;
383 int nlen = msg->attr_size * 2;
385 nattrs = (struct radius_attr_hdr **)
386 realloc(msg->attrs, nlen * sizeof(*msg->attrs));
392 msg->attr_size = nlen;
395 msg->attrs[msg->attr_used++] = attr;
401 struct radius_attr_hdr *radius_msg_add_attr(struct radius_msg *msg, u8 type,
402 const u8 *data, size_t data_len)
405 struct radius_attr_hdr *attr;
407 if (data_len > RADIUS_MAX_ATTR_LEN) {
408 printf("radius_msg_add_attr: too long attribute (%lu bytes)\n",
409 (unsigned long) data_len);
413 buf_needed = msg->buf_used + sizeof(*attr) + data_len;
415 if (msg->buf_size < buf_needed) {
416 /* allocate more space for message buffer */
418 int nlen = msg->buf_size;
421 while (nlen < buf_needed)
423 nbuf = (unsigned char *) realloc(msg->buf, nlen);
426 diff = nbuf - msg->buf;
428 msg->hdr = (struct radius_hdr *) msg->buf;
429 /* adjust attr pointers to match with the new buffer */
430 for (i = 0; i < msg->attr_used; i++)
431 msg->attrs[i] = (struct radius_attr_hdr *)
432 (((u8 *) msg->attrs[i]) + diff);
433 memset(msg->buf + msg->buf_size, 0, nlen - msg->buf_size);
434 msg->buf_size = nlen;
437 attr = (struct radius_attr_hdr *) (msg->buf + msg->buf_used);
439 attr->length = sizeof(*attr) + data_len;
441 memcpy(attr + 1, data, data_len);
443 msg->buf_used += sizeof(*attr) + data_len;
445 if (radius_msg_add_attr_to_array(msg, attr))
452 struct radius_msg *radius_msg_parse(const u8 *data, size_t len)
454 struct radius_msg *msg;
455 struct radius_hdr *hdr;
456 struct radius_attr_hdr *attr;
458 unsigned char *pos, *end;
460 if (data == NULL || len < sizeof(*hdr))
463 hdr = (struct radius_hdr *) data;
465 msg_len = ntohs(hdr->length);
466 if (msg_len < sizeof(*hdr) || msg_len > len) {
467 printf("Invalid RADIUS message length\n");
472 printf("Ignored %lu extra bytes after RADIUS message\n",
473 (unsigned long) len - msg_len);
476 msg = (struct radius_msg *) malloc(sizeof(*msg));
480 if (radius_msg_initialize(msg, msg_len)) {
485 memcpy(msg->buf, data, msg_len);
486 msg->buf_size = msg->buf_used = msg_len;
488 /* parse attributes */
489 pos = (unsigned char *) (msg->hdr + 1);
490 end = msg->buf + msg->buf_used;
492 if (end - pos < sizeof(*attr))
495 attr = (struct radius_attr_hdr *) pos;
497 if (pos + attr->length > end || attr->length < sizeof(*attr))
500 /* TODO: check that attr->length is suitable for attr->type */
502 if (radius_msg_add_attr_to_array(msg, attr))
511 radius_msg_free(msg);
517 int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len)
519 const u8 *pos = data;
520 size_t left = data_len;
524 if (left > RADIUS_MAX_ATTR_LEN)
525 len = RADIUS_MAX_ATTR_LEN;
529 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE,
541 u8 *radius_msg_get_eap(struct radius_msg *msg, size_t *eap_len)
551 for (i = 0; i < msg->attr_used; i++) {
552 if (msg->attrs[i]->type == RADIUS_ATTR_EAP_MESSAGE)
553 len += msg->attrs[i]->length -
554 sizeof(struct radius_attr_hdr);
565 for (i = 0; i < msg->attr_used; i++) {
566 if (msg->attrs[i]->type == RADIUS_ATTR_EAP_MESSAGE) {
567 struct radius_attr_hdr *attr = msg->attrs[i];
568 int flen = attr->length - sizeof(*attr);
569 memcpy(pos, attr + 1, flen);
581 int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret,
582 size_t secret_len, const u8 *req_auth)
584 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
585 u8 orig_authenticator[16];
586 struct radius_attr_hdr *attr = NULL;
589 for (i = 0; i < msg->attr_used; i++) {
590 if (msg->attrs[i]->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
592 printf("Multiple Message-Authenticator "
593 "attributes in RADIUS message\n");
596 attr = msg->attrs[i];
601 printf("No Message-Authenticator attribute found\n");
605 memcpy(orig, attr + 1, MD5_MAC_LEN);
606 memset(attr + 1, 0, MD5_MAC_LEN);
608 memcpy(orig_authenticator, msg->hdr->authenticator,
609 sizeof(orig_authenticator));
610 memcpy(msg->hdr->authenticator, req_auth,
611 sizeof(msg->hdr->authenticator));
613 hmac_md5(secret, secret_len, msg->buf, msg->buf_used, auth);
614 memcpy(attr + 1, orig, MD5_MAC_LEN);
616 memcpy(msg->hdr->authenticator, orig_authenticator,
617 sizeof(orig_authenticator));
620 if (memcmp(orig, auth, MD5_MAC_LEN) != 0) {
621 printf("Invalid Message-Authenticator!\n");
629 int radius_msg_verify(struct radius_msg *msg, const u8 *secret,
630 size_t secret_len, struct radius_msg *sent_msg, int auth)
634 u8 hash[MD5_MAC_LEN];
636 if (sent_msg == NULL) {
637 printf("No matching Access-Request message found\n");
642 radius_msg_verify_msg_auth(msg, secret, secret_len,
643 sent_msg->hdr->authenticator)) {
647 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
648 addr[0] = (u8 *) msg->hdr;
650 addr[1] = sent_msg->hdr->authenticator;
651 len[1] = MD5_MAC_LEN;
652 addr[2] = (u8 *) (msg->hdr + 1);
653 len[2] = msg->buf_used - sizeof(*msg->hdr);
656 md5_vector(4, addr, len, hash);
657 if (memcmp(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) {
658 printf("Response Authenticator invalid!\n");
667 int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src,
670 struct radius_attr_hdr *attr = NULL;
673 for (i = 0; i < src->attr_used; i++) {
674 if (src->attrs[i]->type == type) {
675 attr = src->attrs[i];
683 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1),
684 attr->length - sizeof(*attr)))
691 /* Create Request Authenticator. The value should be unique over the lifetime
692 * of the shared secret between authenticator and authentication server.
693 * Use one-way MD5 hash calculated from current timestamp and some data given
695 void radius_msg_make_authenticator(struct radius_msg *msg,
696 u8 *data, size_t len)
703 gettimeofday(&tv, NULL);
705 addr[0] = (u8 *) &tv;
706 elen[0] = sizeof(tv);
711 md5_vector(3, addr, elen, msg->hdr->authenticator);
715 /* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message.
716 * Returns the Attribute payload and sets alen to indicate the length of the
717 * payload if a vendor attribute with subtype is found, otherwise returns NULL.
718 * The returned payload is allocated with malloc() and caller must free it.
720 static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor,
721 u8 subtype, size_t *alen)
730 for (i = 0; i < msg->attr_used; i++) {
731 struct radius_attr_hdr *attr = msg->attrs[i];
734 struct radius_attr_vendor *vhdr;
736 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC)
739 left = attr->length - sizeof(*attr);
743 pos = (u8 *) (attr + 1);
745 memcpy(&vendor_id, pos, 4);
749 if (ntohl(vendor_id) != vendor)
752 while (left >= sizeof(*vhdr)) {
753 vhdr = (struct radius_attr_vendor *) pos;
754 if (vhdr->vendor_length > left ||
755 vhdr->vendor_length < sizeof(*vhdr)) {
759 if (vhdr->vendor_type != subtype) {
760 pos += vhdr->vendor_length;
761 left -= vhdr->vendor_length;
765 len = vhdr->vendor_length - sizeof(*vhdr);
769 memcpy(data, pos + sizeof(*vhdr), len);
780 static u8 * decrypt_ms_key(const u8 *key, size_t len,
781 const u8 *req_authenticator,
782 const u8 *secret, size_t secret_len, size_t *reslen)
784 u8 *plain, *ppos, *res;
787 u8 hash[MD5_MAC_LEN];
792 /* key: 16-bit salt followed by encrypted key info */
800 printf("Invalid ms key len %lu\n", (unsigned long) left);
805 ppos = plain = malloc(plen);
810 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
811 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
814 elen[0] = secret_len;
816 addr[1] = req_authenticator;
817 elen[1] = MD5_MAC_LEN;
819 elen[2] = 2; /* Salt */
821 addr[1] = pos - MD5_MAC_LEN;
822 elen[1] = MD5_MAC_LEN;
824 md5_vector(first ? 3 : 2, addr, elen, hash);
827 for (i = 0; i < MD5_MAC_LEN; i++)
828 *ppos++ = *pos++ ^ hash[i];
832 if (plain[0] > plen - 1) {
833 printf("Failed to decrypt MPPE key\n");
838 res = malloc(plain[0]);
843 memcpy(res, plain + 1, plain[0]);
851 static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt,
852 const u8 *req_authenticator,
853 const u8 *secret, size_t secret_len,
854 u8 *ebuf, size_t *elen)
856 int i, len, first = 1;
857 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos;
861 saltbuf[0] = salt >> 8;
866 len = (len & 0xf0) + 16;
868 memset(ebuf, 0, len);
870 memcpy(ebuf + 1, key, key_len);
876 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
877 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
879 _len[0] = secret_len;
881 addr[1] = req_authenticator;
882 _len[1] = MD5_MAC_LEN;
884 _len[2] = sizeof(saltbuf);
886 addr[1] = pos - MD5_MAC_LEN;
887 _len[1] = MD5_MAC_LEN;
889 md5_vector(first ? 3 : 2, addr, _len, hash);
892 for (i = 0; i < MD5_MAC_LEN; i++)
900 struct radius_ms_mppe_keys *
901 radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
902 u8 *secret, size_t secret_len)
906 struct radius_ms_mppe_keys *keys;
908 if (msg == NULL || sent_msg == NULL)
911 keys = (struct radius_ms_mppe_keys *) malloc(sizeof(*keys));
915 memset(keys, 0, sizeof(*keys));
917 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
918 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY,
921 keys->send = decrypt_ms_key(key, keylen,
922 sent_msg->hdr->authenticator,
928 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
929 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY,
932 keys->recv = decrypt_ms_key(key, keylen,
933 sent_msg->hdr->authenticator,
943 struct radius_ms_mppe_keys *
944 radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
945 u8 *secret, size_t secret_len)
949 struct radius_ms_mppe_keys *keys;
951 if (msg == NULL || sent_msg == NULL)
954 keys = (struct radius_ms_mppe_keys *) malloc(sizeof(*keys));
958 memset(keys, 0, sizeof(*keys));
960 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO,
961 RADIUS_CISCO_AV_PAIR, &keylen);
962 if (key && keylen == 51 && memcmp(key, "leap:session-key=", 17) == 0) {
963 keys->recv = decrypt_ms_key(key + 17, keylen - 17,
964 sent_msg->hdr->authenticator,
974 int radius_msg_add_mppe_keys(struct radius_msg *msg,
975 const u8 *req_authenticator,
976 const u8 *secret, size_t secret_len,
977 const u8 *send_key, size_t send_key_len,
978 const u8 *recv_key, size_t recv_key_len)
980 struct radius_attr_hdr *attr;
981 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT);
983 struct radius_attr_vendor *vhdr;
989 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2;
991 /* MS-MPPE-Send-Key */
992 buf = malloc(hlen + send_key_len + 16);
997 memcpy(pos, &vendor_id, sizeof(vendor_id));
998 pos += sizeof(vendor_id);
999 vhdr = (struct radius_attr_vendor *) pos;
1000 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY;
1001 pos = (u8 *) (vhdr + 1);
1002 salt = random() | 0x8000;
1005 encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret,
1006 secret_len, pos, &elen);
1007 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1009 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1016 /* MS-MPPE-Recv-Key */
1017 buf = malloc(hlen + send_key_len + 16);
1022 memcpy(pos, &vendor_id, sizeof(vendor_id));
1023 pos += sizeof(vendor_id);
1024 vhdr = (struct radius_attr_vendor *) pos;
1025 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY;
1026 pos = (u8 *) (vhdr + 1);
1030 encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret,
1031 secret_len, pos, &elen);
1032 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1034 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1045 /* Add User-Password attribute to a RADIUS message and encrypt it as specified
1046 * in RFC 2865, Chap. 5.2 */
1047 struct radius_attr_hdr *
1048 radius_msg_add_attr_user_password(struct radius_msg *msg,
1049 u8 *data, size_t data_len,
1050 u8 *secret, size_t secret_len)
1062 memcpy(buf, data, data_len);
1065 padlen = data_len % 16;
1067 padlen = 16 - padlen;
1068 memset(buf + data_len, 0, padlen);
1073 len[0] = secret_len;
1074 addr[1] = msg->hdr->authenticator;
1076 md5_vector(2, addr, len, hash);
1078 for (i = 0; i < 16; i++)
1082 while (pos < buf_len) {
1084 len[0] = secret_len;
1085 addr[1] = &buf[pos - 16];
1087 md5_vector(2, addr, len, hash);
1089 for (i = 0; i < 16; i++)
1090 buf[pos + i] ^= hash[i];
1095 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD,
1100 int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len)
1103 struct radius_attr_hdr *attr = NULL;
1106 for (i = 0; i < msg->attr_used; i++) {
1107 if (msg->attrs[i]->type == type) {
1108 attr = msg->attrs[i];
1116 dlen = attr->length - sizeof(*attr);
1118 memcpy(buf, (attr + 1), dlen > len ? len : dlen);
1123 int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf,
1124 size_t *len, const u8 *start)
1127 struct radius_attr_hdr *attr = NULL;
1129 for (i = 0; i < msg->attr_used; i++) {
1130 if (msg->attrs[i]->type == type &&
1131 (start == NULL || (u8 *) msg->attrs[i] > start)) {
1132 attr = msg->attrs[i];
1140 *buf = (u8 *) (attr + 1);
1141 *len = attr->length - sizeof(*attr);
1146 int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len)
1150 for (count = 0, i = 0; i < msg->attr_used; i++) {
1151 if (msg->attrs[i]->type == type &&
1152 msg->attrs[i]->length >=
1153 sizeof(struct radius_attr_hdr) + min_len)