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.
19 #include <netinet/in.h>
21 #include <sys/ioctl.h>
24 #include <sys/socket.h>
25 #include <arpa/inet.h>
33 struct radius_msg *radius_msg_new(u8 code, u8 identifier)
35 struct radius_msg *msg;
37 msg = (struct radius_msg *) malloc(sizeof(*msg));
41 if (radius_msg_initialize(msg, RADIUS_DEFAULT_MSG_SIZE)) {
46 radius_msg_set_hdr(msg, code, identifier);
52 int radius_msg_initialize(struct radius_msg *msg, size_t init_len)
54 if (msg == NULL || init_len < sizeof(struct radius_hdr))
57 memset(msg, 0, sizeof(*msg));
58 msg->buf = (unsigned char *) malloc(init_len);
61 memset(msg->buf, 0, init_len);
63 msg->buf_size = init_len;
64 msg->hdr = (struct radius_hdr *) msg->buf;
65 msg->buf_used = sizeof(*msg->hdr);
67 msg->attrs = (struct radius_attr_hdr **)
68 malloc(RADIUS_DEFAULT_ATTR_COUNT * sizeof(*msg->attrs));
69 if (msg->attrs == NULL) {
76 msg->attr_size = RADIUS_DEFAULT_ATTR_COUNT;
83 void radius_msg_set_hdr(struct radius_msg *msg, u8 code, u8 identifier)
85 msg->hdr->code = code;
86 msg->hdr->identifier = identifier;
90 void radius_msg_free(struct radius_msg *msg)
92 if (msg->buf != NULL) {
97 msg->buf_size = msg->buf_used = 0;
99 if (msg->attrs != NULL) {
103 msg->attr_size = msg->attr_used = 0;
107 static const char *radius_code_string(u8 code)
110 case RADIUS_CODE_ACCESS_REQUEST: return "Access-Request";
111 case RADIUS_CODE_ACCESS_ACCEPT: return "Access-Accept";
112 case RADIUS_CODE_ACCESS_REJECT: return "Access-Reject";
113 case RADIUS_CODE_ACCOUNTING_REQUEST: return "Accounting-Request";
114 case RADIUS_CODE_ACCOUNTING_RESPONSE: return "Accounting-Response";
115 case RADIUS_CODE_ACCESS_CHALLENGE: return "Access-Challenge";
116 case RADIUS_CODE_STATUS_SERVER: return "Status-Server";
117 case RADIUS_CODE_STATUS_CLIENT: return "Status-Client";
118 case RADIUS_CODE_RESERVED: return "Reserved";
119 default: return "?Unknown?";
124 struct radius_attr_type {
127 enum { RADIUS_ATTR_UNDIST, RADIUS_ATTR_TEXT, RADIUS_ATTR_IP,
128 RADIUS_ATTR_HEXDUMP, RADIUS_ATTR_INT32 } data_type;
131 static struct radius_attr_type radius_attrs[] =
133 { RADIUS_ATTR_USER_NAME, "User-Name", RADIUS_ATTR_TEXT },
134 { RADIUS_ATTR_USER_PASSWORD, "User-Password", RADIUS_ATTR_UNDIST },
135 { RADIUS_ATTR_NAS_IP_ADDRESS, "NAS-IP-Address", RADIUS_ATTR_IP },
136 { RADIUS_ATTR_NAS_PORT, "NAS-Port", RADIUS_ATTR_INT32 },
137 { RADIUS_ATTR_FRAMED_MTU, "Framed-MTU", RADIUS_ATTR_INT32 },
138 { RADIUS_ATTR_STATE, "State", RADIUS_ATTR_UNDIST },
139 { RADIUS_ATTR_CLASS, "Class", RADIUS_ATTR_UNDIST },
140 { RADIUS_ATTR_VENDOR_SPECIFIC, "Vendor-Specific", RADIUS_ATTR_UNDIST },
141 { RADIUS_ATTR_SESSION_TIMEOUT, "Session-Timeout", RADIUS_ATTR_INT32 },
142 { RADIUS_ATTR_IDLE_TIMEOUT, "Idle-Timeout", RADIUS_ATTR_INT32 },
143 { RADIUS_ATTR_TERMINATION_ACTION, "Termination-Action",
145 { RADIUS_ATTR_CALLED_STATION_ID, "Called-Station-Id",
147 { RADIUS_ATTR_CALLING_STATION_ID, "Calling-Station-Id",
149 { RADIUS_ATTR_NAS_IDENTIFIER, "NAS-Identifier", RADIUS_ATTR_TEXT },
150 { RADIUS_ATTR_ACCT_STATUS_TYPE, "Acct-Status-Type",
152 { RADIUS_ATTR_ACCT_DELAY_TIME, "Acct-Delay-Time", RADIUS_ATTR_INT32 },
153 { RADIUS_ATTR_ACCT_INPUT_OCTETS, "Acct-Input-Octets",
155 { RADIUS_ATTR_ACCT_OUTPUT_OCTETS, "Acct-Output-Octets",
157 { RADIUS_ATTR_ACCT_SESSION_ID, "Acct-Session-Id", RADIUS_ATTR_TEXT },
158 { RADIUS_ATTR_ACCT_AUTHENTIC, "Acct-Authentic", RADIUS_ATTR_INT32 },
159 { RADIUS_ATTR_ACCT_SESSION_TIME, "Acct-Session-Time",
161 { RADIUS_ATTR_ACCT_INPUT_PACKETS, "Acct-Input-Packets",
163 { RADIUS_ATTR_ACCT_OUTPUT_PACKETS, "Acct-Output-Packets",
165 { RADIUS_ATTR_ACCT_TERMINATE_CAUSE, "Acct-Terminate-Cause",
167 { RADIUS_ATTR_ACCT_MULTI_SESSION_ID, "Acct-Multi-Session-Id",
169 { RADIUS_ATTR_ACCT_LINK_COUNT, "Acct-Link-Count", RADIUS_ATTR_INT32 },
170 { RADIUS_ATTR_ACCT_INPUT_GIGAWORDS, "Acct-Input-Gigawords",
172 { RADIUS_ATTR_ACCT_OUTPUT_GIGAWORDS, "Acct-Output-Gigawords",
174 { RADIUS_ATTR_EVENT_TIMESTAMP, "Event-Timestamp",
176 { RADIUS_ATTR_NAS_PORT_TYPE, "NAS-Port-Type", RADIUS_ATTR_INT32 },
177 { RADIUS_ATTR_CONNECT_INFO, "Connect-Info", RADIUS_ATTR_TEXT },
178 { RADIUS_ATTR_EAP_MESSAGE, "EAP-Message", RADIUS_ATTR_UNDIST },
179 { RADIUS_ATTR_MESSAGE_AUTHENTICATOR, "Message-Authenticator",
180 RADIUS_ATTR_UNDIST },
181 { RADIUS_ATTR_ACCT_INTERIM_INTERVAL, "Acct-Interim-Interval",
185 #define RADIUS_ATTRS (sizeof(radius_attrs) / sizeof(radius_attrs[0]))
188 static struct radius_attr_type *radius_get_attr_type(u8 type)
192 for (i = 0; i < RADIUS_ATTRS; i++) {
193 if (type == radius_attrs[i].type)
194 return &radius_attrs[i];
201 static void radius_msg_dump_attr(struct radius_attr_hdr *hdr)
203 struct radius_attr_type *attr;
207 attr = radius_get_attr_type(hdr->type);
209 printf(" Attribute %d (%s) length=%d\n",
210 hdr->type, attr ? attr->name : "?Unknown?", hdr->length);
215 len = hdr->length - sizeof(struct radius_attr_hdr);
216 pos = (unsigned char *) (hdr + 1);
218 switch (attr->data_type) {
219 case RADIUS_ATTR_TEXT:
221 for (i = 0; i < len; i++)
228 struct in_addr *addr = (struct in_addr *) pos;
229 printf(" Value: %s\n", inet_ntoa(*addr));
231 printf(" Invalid IP address length %d\n", len);
234 case RADIUS_ATTR_HEXDUMP:
235 case RADIUS_ATTR_UNDIST:
237 for (i = 0; i < len; i++)
238 printf(" %02x", pos[i]);
242 case RADIUS_ATTR_INT32:
244 u32 *val = (u32 *) pos;
245 printf(" Value: %d\n", ntohl(*val));
247 printf(" Invalid INT32 length %d\n", len);
256 void radius_msg_dump(struct radius_msg *msg)
260 printf("RADIUS message: code=%d (%s) identifier=%d length=%d\n",
261 msg->hdr->code, radius_code_string(msg->hdr->code),
262 msg->hdr->identifier, ntohs(msg->hdr->length));
264 for (i = 0; i < msg->attr_used; i++) {
265 radius_msg_dump_attr(msg->attrs[i]);
270 int radius_msg_finish(struct radius_msg *msg, u8 *secret, size_t secret_len)
273 u8 auth[MD5_MAC_LEN];
274 struct radius_attr_hdr *attr;
276 memset(auth, 0, MD5_MAC_LEN);
277 attr = radius_msg_add_attr(msg,
278 RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
281 printf("WARNING: Could not add "
282 "Message-Authenticator\n");
285 msg->hdr->length = htons(msg->buf_used);
286 hmac_md5(secret, secret_len, msg->buf, msg->buf_used,
289 msg->hdr->length = htons(msg->buf_used);
291 if (msg->buf_used > 0xffff) {
292 printf("WARNING: too long RADIUS message (%lu)\n",
293 (unsigned long) msg->buf_used);
300 int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret,
301 size_t secret_len, const u8 *req_authenticator)
303 u8 auth[MD5_MAC_LEN];
304 struct radius_attr_hdr *attr;
307 memset(auth, 0, MD5_MAC_LEN);
308 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
311 printf("WARNING: Could not add Message-Authenticator\n");
314 msg->hdr->length = htons(msg->buf_used);
315 memcpy(msg->hdr->authenticator, req_authenticator,
316 sizeof(msg->hdr->authenticator));
317 hmac_md5(secret, secret_len, msg->buf, msg->buf_used,
320 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
322 MD5Update(&context, (u8 *) msg->hdr, 1 + 1 + 2);
323 MD5Update(&context, req_authenticator, MD5_MAC_LEN);
324 MD5Update(&context, (u8 *) (msg->hdr + 1),
325 msg->buf_used - sizeof(*msg->hdr));
326 MD5Update(&context, secret, secret_len);
327 MD5Final(msg->hdr->authenticator, &context);
329 if (msg->buf_used > 0xffff) {
330 printf("WARNING: too long RADIUS message (%lu)\n",
331 (unsigned long) msg->buf_used);
338 void radius_msg_finish_acct(struct radius_msg *msg, u8 *secret,
343 msg->hdr->length = htons(msg->buf_used);
344 memset(msg->hdr->authenticator, 0, MD5_MAC_LEN);
346 MD5Update(&context, msg->buf, msg->buf_used);
347 MD5Update(&context, secret, secret_len);
348 MD5Final(msg->hdr->authenticator, &context);
350 if (msg->buf_used > 0xffff) {
351 printf("WARNING: too long RADIUS messages (%lu)\n",
352 (unsigned long) msg->buf_used);
357 static int radius_msg_add_attr_to_array(struct radius_msg *msg,
358 struct radius_attr_hdr *attr)
360 if (msg->attr_used >= msg->attr_size) {
361 struct radius_attr_hdr **nattrs;
362 int nlen = msg->attr_size * 2;
364 nattrs = (struct radius_attr_hdr **)
365 realloc(msg->attrs, nlen * sizeof(*msg->attrs));
371 msg->attr_size = nlen;
374 msg->attrs[msg->attr_used++] = attr;
380 struct radius_attr_hdr *radius_msg_add_attr(struct radius_msg *msg, u8 type,
381 u8 *data, size_t data_len)
384 struct radius_attr_hdr *attr;
386 if (data_len > RADIUS_MAX_ATTR_LEN) {
387 printf("radius_msg_add_attr: too long attribute (%lu bytes)\n",
388 (unsigned long) data_len);
392 buf_needed = msg->buf_used + sizeof(*attr) + data_len;
394 if (msg->buf_size < buf_needed) {
395 /* allocate more space for message buffer */
397 int nlen = msg->buf_size;
400 while (nlen < buf_needed)
402 nbuf = (unsigned char *) realloc(msg->buf, nlen);
405 diff = nbuf - msg->buf;
407 msg->hdr = (struct radius_hdr *) msg->buf;
408 /* adjust attr pointers to match with the new buffer */
409 for (i = 0; i < msg->attr_used; i++)
410 msg->attrs[i] = (struct radius_attr_hdr *)
411 (((u8 *) msg->attrs[i]) + diff);
412 memset(msg->buf + msg->buf_size, 0, nlen - msg->buf_size);
413 msg->buf_size = nlen;
416 attr = (struct radius_attr_hdr *) (msg->buf + msg->buf_used);
418 attr->length = sizeof(*attr) + data_len;
420 memcpy(attr + 1, data, data_len);
422 msg->buf_used += sizeof(*attr) + data_len;
424 if (radius_msg_add_attr_to_array(msg, attr))
431 struct radius_msg *radius_msg_parse(const u8 *data, size_t len)
433 struct radius_msg *msg;
434 struct radius_hdr *hdr;
435 struct radius_attr_hdr *attr;
437 unsigned char *pos, *end;
439 if (data == NULL || len < sizeof(*hdr))
442 hdr = (struct radius_hdr *) data;
444 msg_len = ntohs(hdr->length);
445 if (msg_len < sizeof(*hdr) || msg_len > len) {
446 printf("Invalid RADIUS message length\n");
451 printf("Ignored %lu extra bytes after RADIUS message\n",
452 (unsigned long) len - msg_len);
455 msg = (struct radius_msg *) malloc(sizeof(*msg));
459 if (radius_msg_initialize(msg, msg_len)) {
464 memcpy(msg->buf, data, msg_len);
465 msg->buf_size = msg->buf_used = msg_len;
467 /* parse attributes */
468 pos = (unsigned char *) (msg->hdr + 1);
469 end = msg->buf + msg->buf_used;
471 if (end - pos < sizeof(*attr))
474 attr = (struct radius_attr_hdr *) pos;
476 if (pos + attr->length > end || attr->length < sizeof(*attr))
479 /* TODO: check that attr->length is suitable for attr->type */
481 if (radius_msg_add_attr_to_array(msg, attr))
490 radius_msg_free(msg);
496 int radius_msg_add_eap(struct radius_msg *msg, u8 *data, size_t data_len)
499 size_t left = data_len;
503 if (left > RADIUS_MAX_ATTR_LEN)
504 len = RADIUS_MAX_ATTR_LEN;
508 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE,
520 u8 *radius_msg_get_eap(struct radius_msg *msg, size_t *eap_len)
530 for (i = 0; i < msg->attr_used; i++) {
531 if (msg->attrs[i]->type == RADIUS_ATTR_EAP_MESSAGE)
532 len += msg->attrs[i]->length -
533 sizeof(struct radius_attr_hdr);
544 for (i = 0; i < msg->attr_used; i++) {
545 if (msg->attrs[i]->type == RADIUS_ATTR_EAP_MESSAGE) {
546 struct radius_attr_hdr *attr = msg->attrs[i];
547 int flen = attr->length - sizeof(*attr);
548 memcpy(pos, attr + 1, flen);
560 int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret,
561 size_t secret_len, const u8 *req_auth)
563 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
564 u8 orig_authenticator[16];
565 struct radius_attr_hdr *attr = NULL;
568 for (i = 0; i < msg->attr_used; i++) {
569 if (msg->attrs[i]->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
571 printf("Multiple Message-Authenticator "
572 "attributes in RADIUS message\n");
575 attr = msg->attrs[i];
580 printf("No Message-Authenticator attribute found\n");
584 memcpy(orig, attr + 1, MD5_MAC_LEN);
585 memset(attr + 1, 0, MD5_MAC_LEN);
587 memcpy(orig_authenticator, msg->hdr->authenticator,
588 sizeof(orig_authenticator));
589 memcpy(msg->hdr->authenticator, req_auth,
590 sizeof(msg->hdr->authenticator));
592 hmac_md5(secret, secret_len, msg->buf, msg->buf_used, auth);
593 memcpy(attr + 1, orig, MD5_MAC_LEN);
595 memcpy(msg->hdr->authenticator, orig_authenticator,
596 sizeof(orig_authenticator));
599 if (memcmp(orig, auth, MD5_MAC_LEN) != 0) {
600 printf("Invalid Message-Authenticator!\n");
608 int radius_msg_verify(struct radius_msg *msg, u8 *secret, size_t secret_len,
609 struct radius_msg *sent_msg)
612 u8 hash[MD5_MAC_LEN];
614 if (sent_msg == NULL) {
615 printf("No matching Access-Request message found\n");
619 if (radius_msg_verify_msg_auth(msg, secret, secret_len,
620 sent_msg->hdr->authenticator)) {
624 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
626 MD5Update(&context, (u8 *) msg->hdr, 1 + 1 + 2);
627 MD5Update(&context, sent_msg->hdr->authenticator, MD5_MAC_LEN);
628 MD5Update(&context, (u8 *) (msg->hdr + 1),
629 msg->buf_used - sizeof(*msg->hdr));
630 MD5Update(&context, secret, secret_len);
631 MD5Final(hash, &context);
632 if (memcmp(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) {
633 printf("Response Authenticator invalid!\n");
642 int radius_msg_verify_acct(struct radius_msg *msg, u8 *secret,
643 size_t secret_len, struct radius_msg *sent_msg)
646 u8 hash[MD5_MAC_LEN];
649 MD5Update(&context, msg->buf, 4);
650 MD5Update(&context, sent_msg->hdr->authenticator, MD5_MAC_LEN);
651 if (msg->buf_used > sizeof(struct radius_hdr))
652 MD5Update(&context, msg->buf + sizeof(struct radius_hdr),
653 msg->buf_used - sizeof(struct radius_hdr));
654 MD5Update(&context, secret, secret_len);
655 MD5Final(hash, &context);
656 if (memcmp(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) {
657 printf("Response Authenticator invalid!\n");
665 int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src,
668 struct radius_attr_hdr *attr = NULL;
671 for (i = 0; i < src->attr_used; i++) {
672 if (src->attrs[i]->type == type) {
673 attr = src->attrs[i];
681 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1),
682 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 u8 *data, size_t len)
700 gettimeofday(&tv, NULL);
703 MD5Update(&context, (u8 *) &tv, sizeof(tv));
704 MD5Update(&context, data, len);
705 MD5Update(&context, (u8 *) &l, sizeof(l));
706 MD5Final(msg->hdr->authenticator, &context);
710 /* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message.
711 * Returns the Attribute payload and sets alen to indicate the length of the
712 * payload if a vendor attribute with subtype is found, otherwise returns NULL.
713 * The returned payload is allocated with malloc() and caller must free it.
715 static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor,
716 u8 subtype, size_t *alen)
725 for (i = 0; i < msg->attr_used; i++) {
726 struct radius_attr_hdr *attr = msg->attrs[i];
729 struct radius_attr_vendor *vhdr;
731 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC)
734 left = attr->length - sizeof(*attr);
738 pos = (u8 *) (attr + 1);
740 memcpy(&vendor_id, pos, 4);
744 if (ntohl(vendor_id) != vendor)
747 while (left >= sizeof(*vhdr)) {
748 vhdr = (struct radius_attr_vendor *) pos;
749 if (vhdr->vendor_length > left ||
750 vhdr->vendor_length < sizeof(*vhdr)) {
754 if (vhdr->vendor_type != subtype) {
755 pos += vhdr->vendor_length;
756 left -= vhdr->vendor_length;
760 len = vhdr->vendor_length - sizeof(*vhdr);
764 memcpy(data, pos + sizeof(*vhdr), len);
775 static u8 * decrypt_ms_key(const u8 *key, size_t len,
776 const u8 *req_authenticator,
777 const u8 *secret, size_t secret_len, size_t *reslen)
779 u8 *plain, *ppos, *res;
782 u8 hash[MD5_MAC_LEN];
786 /* key: 16-bit salt followed by encrypted key info */
794 printf("Invalid ms key len %lu\n", (unsigned long) left);
799 ppos = plain = malloc(plen);
804 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
805 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
808 MD5Update(&context, secret, secret_len);
810 MD5Update(&context, req_authenticator, MD5_MAC_LEN);
811 MD5Update(&context, key, 2); /* Salt */
814 MD5Update(&context, pos - MD5_MAC_LEN, MD5_MAC_LEN);
815 MD5Final(hash, &context);
817 for (i = 0; i < MD5_MAC_LEN; i++)
818 *ppos++ = *pos++ ^ hash[i];
822 if (plain[0] > plen - 1) {
823 printf("Failed to decrypt MPPE key\n");
828 res = malloc(plain[0]);
833 memcpy(res, plain + 1, plain[0]);
841 static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt,
842 const u8 *req_authenticator,
843 const u8 *secret, size_t secret_len,
844 u8 *ebuf, size_t *elen)
846 int i, len, first = 1;
847 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos;
850 saltbuf[0] = salt >> 8;
855 len = (len & 0xf0) + 16;
857 memset(ebuf, 0, len);
859 memcpy(ebuf + 1, key, key_len);
865 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
866 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
868 MD5Update(&context, secret, secret_len);
870 MD5Update(&context, req_authenticator, MD5_MAC_LEN);
871 MD5Update(&context, saltbuf, sizeof(saltbuf));
874 MD5Update(&context, pos - MD5_MAC_LEN, MD5_MAC_LEN);
876 MD5Final(hash, &context);
878 for (i = 0; i < MD5_MAC_LEN; i++)
886 struct radius_ms_mppe_keys *
887 radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
888 u8 *secret, size_t secret_len)
892 struct radius_ms_mppe_keys *keys;
894 if (msg == NULL || sent_msg == NULL)
897 keys = (struct radius_ms_mppe_keys *) malloc(sizeof(*keys));
901 memset(keys, 0, sizeof(*keys));
903 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
904 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY,
907 keys->send = decrypt_ms_key(key, keylen,
908 sent_msg->hdr->authenticator,
914 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
915 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY,
918 keys->recv = decrypt_ms_key(key, keylen,
919 sent_msg->hdr->authenticator,
929 struct radius_ms_mppe_keys *
930 radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
931 u8 *secret, size_t secret_len)
935 struct radius_ms_mppe_keys *keys;
937 if (msg == NULL || sent_msg == NULL)
940 keys = (struct radius_ms_mppe_keys *) malloc(sizeof(*keys));
944 memset(keys, 0, sizeof(*keys));
946 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO,
947 RADIUS_CISCO_AV_PAIR, &keylen);
948 if (key && keylen == 51 && memcmp(key, "leap:session-key=", 17) == 0) {
949 keys->recv = decrypt_ms_key(key + 17, keylen - 17,
950 sent_msg->hdr->authenticator,
960 int radius_msg_add_mppe_keys(struct radius_msg *msg,
961 const u8 *req_authenticator,
962 const u8 *secret, size_t secret_len,
963 const u8 *send_key, size_t send_key_len,
964 const u8 *recv_key, size_t recv_key_len)
966 struct radius_attr_hdr *attr;
967 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT);
969 struct radius_attr_vendor *vhdr;
975 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2;
977 /* MS-MPPE-Send-Key */
978 buf = malloc(hlen + send_key_len + 16);
983 memcpy(pos, &vendor_id, sizeof(vendor_id));
984 pos += sizeof(vendor_id);
985 vhdr = (struct radius_attr_vendor *) pos;
986 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY;
987 pos = (u8 *) (vhdr + 1);
988 salt = random() | 0x8000;
991 encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret,
992 secret_len, pos, &elen);
993 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
995 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1002 /* MS-MPPE-Recv-Key */
1003 buf = malloc(hlen + send_key_len + 16);
1008 memcpy(pos, &vendor_id, sizeof(vendor_id));
1009 pos += sizeof(vendor_id);
1010 vhdr = (struct radius_attr_vendor *) pos;
1011 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY;
1012 pos = (u8 *) (vhdr + 1);
1016 encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret,
1017 secret_len, pos, &elen);
1018 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1020 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1031 /* Add User-Password attribute to a RADIUS message and encrypt it as specified
1032 * in RFC 2865, Chap. 5.2 */
1033 struct radius_attr_hdr *
1034 radius_msg_add_attr_user_password(struct radius_msg *msg,
1035 u8 *data, size_t data_len,
1036 u8 *secret, size_t secret_len)
1047 memcpy(buf, data, data_len);
1050 padlen = data_len % 16;
1052 padlen = 16 - padlen;
1053 memset(buf + data_len, 0, padlen);
1058 MD5Update(&context, secret, secret_len);
1059 MD5Update(&context, msg->hdr->authenticator, 16);
1060 MD5Final(hash, &context);
1062 for (i = 0; i < 16; i++)
1066 while (pos < buf_len) {
1068 MD5Update(&context, secret, secret_len);
1069 MD5Update(&context, &buf[pos - 16], 16);
1070 MD5Final(hash, &context);
1072 for (i = 0; i < 16; i++)
1073 buf[pos + i] ^= hash[i];
1078 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD,
1083 int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len)
1086 struct radius_attr_hdr *attr = NULL;
1089 for (i = 0; i < msg->attr_used; i++) {
1090 if (msg->attrs[i]->type == type) {
1091 attr = msg->attrs[i];
1099 dlen = attr->length - sizeof(*attr);
1101 memcpy(buf, (attr + 1), dlen > len ? len : dlen);
1106 int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf,
1110 struct radius_attr_hdr *attr = NULL;
1112 for (i = 0; i < msg->attr_used; i++) {
1113 if (msg->attrs[i]->type == type) {
1114 attr = msg->attrs[i];
1122 *buf = (u8 *) (attr + 1);
1123 *len = attr->length - sizeof(*attr);