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Disconnect hostapd from building in base
[dragonfly.git] / contrib / hostapd / src / radius / radius.c
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CommitLineData
1/*
2 * RADIUS message processing
3 * Copyright (c) 2002-2009, 2011-2012, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9#include "utils/includes.h"
10
11#include "utils/common.h"
12#include "utils/wpabuf.h"
13#include "crypto/md5.h"
14#include "crypto/crypto.h"
15#include "radius.h"
16
17
18/**
19 * struct radius_msg - RADIUS message structure for new and parsed messages
20 */
21struct radius_msg {
22 /**
23 * buf - Allocated buffer for RADIUS message
24 */
25 struct wpabuf *buf;
26
27 /**
28 * hdr - Pointer to the RADIUS header in buf
29 */
30 struct radius_hdr *hdr;
31
32 /**
33 * attr_pos - Array of indexes to attributes
34 *
35 * The values are number of bytes from buf to the beginning of
36 * struct radius_attr_hdr.
37 */
38 size_t *attr_pos;
39
40 /**
41 * attr_size - Total size of the attribute pointer array
42 */
43 size_t attr_size;
44
45 /**
46 * attr_used - Total number of attributes in the array
47 */
48 size_t attr_used;
49};
50
51
52struct radius_hdr * radius_msg_get_hdr(struct radius_msg *msg)
53{
54 return msg->hdr;
55}
56
57
58struct wpabuf * radius_msg_get_buf(struct radius_msg *msg)
59{
60 return msg->buf;
61}
62
63
64static struct radius_attr_hdr *
65radius_get_attr_hdr(struct radius_msg *msg, int idx)
66{
67 return (struct radius_attr_hdr *)
68 (wpabuf_mhead_u8(msg->buf) + msg->attr_pos[idx]);
69}
70
71
72static void radius_msg_set_hdr(struct radius_msg *msg, u8 code, u8 identifier)
73{
74 msg->hdr->code = code;
75 msg->hdr->identifier = identifier;
76}
77
78
79static int radius_msg_initialize(struct radius_msg *msg)
80{
81 msg->attr_pos = os_calloc(RADIUS_DEFAULT_ATTR_COUNT,
82 sizeof(*msg->attr_pos));
83 if (msg->attr_pos == NULL)
84 return -1;
85
86 msg->attr_size = RADIUS_DEFAULT_ATTR_COUNT;
87 msg->attr_used = 0;
88
89 return 0;
90}
91
92
93/**
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
98 *
99 * The caller is responsible for freeing the returned data with
100 * radius_msg_free().
101 */
102struct radius_msg * radius_msg_new(u8 code, u8 identifier)
103{
104 struct radius_msg *msg;
105
106 msg = os_zalloc(sizeof(*msg));
107 if (msg == NULL)
108 return NULL;
109
110 msg->buf = wpabuf_alloc(RADIUS_DEFAULT_MSG_SIZE);
111 if (msg->buf == NULL || radius_msg_initialize(msg)) {
112 radius_msg_free(msg);
113 return NULL;
114 }
115 msg->hdr = wpabuf_put(msg->buf, sizeof(struct radius_hdr));
116
117 radius_msg_set_hdr(msg, code, identifier);
118
119 return msg;
120}
121
122
123/**
124 * radius_msg_free - Free a RADIUS message
125 * @msg: RADIUS message from radius_msg_new() or radius_msg_parse()
126 */
127void radius_msg_free(struct radius_msg *msg)
128{
129 if (msg == NULL)
130 return;
131
132 wpabuf_free(msg->buf);
133 os_free(msg->attr_pos);
134 os_free(msg);
135}
136
137
138static const char *radius_code_string(u8 code)
139{
140 switch (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?";
157 }
158}
159
160
161struct radius_attr_type {
162 u8 type;
163 char *name;
164 enum {
165 RADIUS_ATTR_UNDIST, RADIUS_ATTR_TEXT, RADIUS_ATTR_IP,
166 RADIUS_ATTR_HEXDUMP, RADIUS_ATTR_INT32, RADIUS_ATTR_IPV6
167 } data_type;
168};
169
170static struct radius_attr_type radius_attrs[] =
171{
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",
184 RADIUS_ATTR_INT32 },
185 { RADIUS_ATTR_CALLED_STATION_ID, "Called-Station-Id",
186 RADIUS_ATTR_TEXT },
187 { RADIUS_ATTR_CALLING_STATION_ID, "Calling-Station-Id",
188 RADIUS_ATTR_TEXT },
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",
192 RADIUS_ATTR_INT32 },
193 { RADIUS_ATTR_ACCT_DELAY_TIME, "Acct-Delay-Time", RADIUS_ATTR_INT32 },
194 { RADIUS_ATTR_ACCT_INPUT_OCTETS, "Acct-Input-Octets",
195 RADIUS_ATTR_INT32 },
196 { RADIUS_ATTR_ACCT_OUTPUT_OCTETS, "Acct-Output-Octets",
197 RADIUS_ATTR_INT32 },
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",
201 RADIUS_ATTR_INT32 },
202 { RADIUS_ATTR_ACCT_INPUT_PACKETS, "Acct-Input-Packets",
203 RADIUS_ATTR_INT32 },
204 { RADIUS_ATTR_ACCT_OUTPUT_PACKETS, "Acct-Output-Packets",
205 RADIUS_ATTR_INT32 },
206 { RADIUS_ATTR_ACCT_TERMINATE_CAUSE, "Acct-Terminate-Cause",
207 RADIUS_ATTR_INT32 },
208 { RADIUS_ATTR_ACCT_MULTI_SESSION_ID, "Acct-Multi-Session-Id",
209 RADIUS_ATTR_TEXT },
210 { RADIUS_ATTR_ACCT_LINK_COUNT, "Acct-Link-Count", RADIUS_ATTR_INT32 },
211 { RADIUS_ATTR_ACCT_INPUT_GIGAWORDS, "Acct-Input-Gigawords",
212 RADIUS_ATTR_INT32 },
213 { RADIUS_ATTR_ACCT_OUTPUT_GIGAWORDS, "Acct-Output-Gigawords",
214 RADIUS_ATTR_INT32 },
215 { RADIUS_ATTR_EVENT_TIMESTAMP, "Event-Timestamp",
216 RADIUS_ATTR_INT32 },
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",
230 RADIUS_ATTR_INT32 },
231 { RADIUS_ATTR_CHARGEABLE_USER_IDENTITY, "Chargeable-User-Identity",
232 RADIUS_ATTR_TEXT },
233 { RADIUS_ATTR_NAS_IPV6_ADDRESS, "NAS-IPv6-Address", RADIUS_ATTR_IPV6 },
234 { RADIUS_ATTR_ERROR_CAUSE, "Error-Cause", RADIUS_ATTR_INT32 }
235};
236#define RADIUS_ATTRS ARRAY_SIZE(radius_attrs)
237
238
239static struct radius_attr_type *radius_get_attr_type(u8 type)
240{
241 size_t i;
242
243 for (i = 0; i < RADIUS_ATTRS; i++) {
244 if (type == radius_attrs[i].type)
245 return &radius_attrs[i];
246 }
247
248 return NULL;
249}
250
251
252static void print_char(char c)
253{
254 if (c >= 32 && c < 127)
255 printf("%c", c);
256 else
257 printf("<%02x>", c);
258}
259
260
261static void radius_msg_dump_attr(struct radius_attr_hdr *hdr)
262{
263 struct radius_attr_type *attr;
264 int i, len;
265 unsigned char *pos;
266
267 attr = radius_get_attr_type(hdr->type);
268
269 printf(" Attribute %d (%s) length=%d\n",
270 hdr->type, attr ? attr->name : "?Unknown?", hdr->length);
271
272 if (attr == NULL || hdr->length < sizeof(struct radius_attr_hdr))
273 return;
274
275 len = hdr->length - sizeof(struct radius_attr_hdr);
276 pos = (unsigned char *) (hdr + 1);
277
278 switch (attr->data_type) {
279 case RADIUS_ATTR_TEXT:
280 printf(" Value: '");
281 for (i = 0; i < len; i++)
282 print_char(pos[i]);
283 printf("'\n");
284 break;
285
286 case RADIUS_ATTR_IP:
287 if (len == 4) {
288 struct in_addr addr;
289 os_memcpy(&addr, pos, 4);
290 printf(" Value: %s\n", inet_ntoa(addr));
291 } else
292 printf(" Invalid IP address length %d\n", len);
293 break;
294
295#ifdef CONFIG_IPV6
296 case RADIUS_ATTR_IPV6:
297 if (len == 16) {
298 char buf[128];
299 const char *atxt;
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 : "?");
303 } else
304 printf(" Invalid IPv6 address length %d\n", len);
305 break;
306#endif /* CONFIG_IPV6 */
307
308 case RADIUS_ATTR_HEXDUMP:
309 case RADIUS_ATTR_UNDIST:
310 printf(" Value:");
311 for (i = 0; i < len; i++)
312 printf(" %02x", pos[i]);
313 printf("\n");
314 break;
315
316 case RADIUS_ATTR_INT32:
317 if (len == 4)
318 printf(" Value: %u\n", WPA_GET_BE32(pos));
319 else
320 printf(" Invalid INT32 length %d\n", len);
321 break;
322
323 default:
324 break;
325 }
326}
327
328
329void radius_msg_dump(struct radius_msg *msg)
330{
331 size_t i;
332
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));
336
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);
340 }
341}
342
343
344int radius_msg_finish(struct radius_msg *msg, const u8 *secret,
345 size_t secret_len)
346{
347 if (secret) {
348 u8 auth[MD5_MAC_LEN];
349 struct radius_attr_hdr *attr;
350
351 os_memset(auth, 0, MD5_MAC_LEN);
352 attr = radius_msg_add_attr(msg,
353 RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
354 auth, MD5_MAC_LEN);
355 if (attr == NULL) {
356 wpa_printf(MSG_WARNING, "RADIUS: Could not add "
357 "Message-Authenticator");
358 return -1;
359 }
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));
363 } else
364 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
365
366 if (wpabuf_len(msg->buf) > 0xffff) {
367 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
368 (unsigned long) wpabuf_len(msg->buf));
369 return -1;
370 }
371 return 0;
372}
373
374
375int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret,
376 size_t secret_len, const u8 *req_authenticator)
377{
378 u8 auth[MD5_MAC_LEN];
379 struct radius_attr_hdr *attr;
380 const u8 *addr[4];
381 size_t len[4];
382
383 os_memset(auth, 0, MD5_MAC_LEN);
384 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
385 auth, MD5_MAC_LEN);
386 if (attr == NULL) {
387 printf("WARNING: Could not add Message-Authenticator\n");
388 return -1;
389 }
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));
395
396 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
397 addr[0] = (u8 *) msg->hdr;
398 len[0] = 1 + 1 + 2;
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);
403 addr[3] = secret;
404 len[3] = secret_len;
405 md5_vector(4, addr, len, msg->hdr->authenticator);
406
407 if (wpabuf_len(msg->buf) > 0xffff) {
408 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
409 (unsigned long) wpabuf_len(msg->buf));
410 return -1;
411 }
412 return 0;
413}
414
415
416int radius_msg_finish_das_resp(struct radius_msg *msg, const u8 *secret,
417 size_t secret_len,
418 const struct radius_hdr *req_hdr)
419{
420 const u8 *addr[2];
421 size_t len[2];
422 u8 auth[MD5_MAC_LEN];
423 struct radius_attr_hdr *attr;
424
425 os_memset(auth, 0, MD5_MAC_LEN);
426 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
427 auth, MD5_MAC_LEN);
428 if (attr == NULL) {
429 wpa_printf(MSG_WARNING, "Could not add Message-Authenticator");
430 return -1;
431 }
432
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));
437
438 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
439 addr[0] = wpabuf_head_u8(msg->buf);
440 len[0] = wpabuf_len(msg->buf);
441 addr[1] = secret;
442 len[1] = secret_len;
443 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0)
444 return -1;
445
446 if (wpabuf_len(msg->buf) > 0xffff) {
447 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
448 (unsigned long) wpabuf_len(msg->buf));
449 return -1;
450 }
451 return 0;
452}
453
454
455void radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret,
456 size_t secret_len)
457{
458 const u8 *addr[2];
459 size_t len[2];
460
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);
465 addr[1] = secret;
466 len[1] = secret_len;
467 md5_vector(2, addr, len, msg->hdr->authenticator);
468
469 if (wpabuf_len(msg->buf) > 0xffff) {
470 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
471 (unsigned long) wpabuf_len(msg->buf));
472 }
473}
474
475
476int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret,
477 size_t secret_len)
478{
479 const u8 *addr[4];
480 size_t len[4];
481 u8 zero[MD5_MAC_LEN];
482 u8 hash[MD5_MAC_LEN];
483
484 os_memset(zero, 0, sizeof(zero));
485 addr[0] = (u8 *) msg->hdr;
486 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
487 addr[1] = zero;
488 len[1] = MD5_MAC_LEN;
489 addr[2] = (u8 *) (msg->hdr + 1);
490 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
491 addr[3] = secret;
492 len[3] = secret_len;
493 md5_vector(4, addr, len, hash);
494 return os_memcmp(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0;
495}
496
497
498int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret,
499 size_t secret_len)
500{
501 const u8 *addr[4];
502 size_t len[4];
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];
507
508 struct radius_attr_hdr *attr = NULL, *tmp;
509 size_t i;
510
511 os_memset(zero, 0, sizeof(zero));
512 addr[0] = (u8 *) msg->hdr;
513 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
514 addr[1] = zero;
515 len[1] = MD5_MAC_LEN;
516 addr[2] = (u8 *) (msg->hdr + 1);
517 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
518 addr[3] = secret;
519 len[3] = secret_len;
520 md5_vector(4, addr, len, hash);
521 if (os_memcmp(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0)
522 return 1;
523
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) {
527 if (attr != NULL) {
528 wpa_printf(MSG_WARNING, "Multiple "
529 "Message-Authenticator attributes "
530 "in RADIUS message");
531 return 1;
532 }
533 attr = tmp;
534 }
535 }
536
537 if (attr == NULL) {
538 /* Message-Authenticator is MAY; not required */
539 return 0;
540 }
541
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));
553
554 return os_memcmp(orig, auth, MD5_MAC_LEN) != 0;
555}
556
557
558static int radius_msg_add_attr_to_array(struct radius_msg *msg,
559 struct radius_attr_hdr *attr)
560{
561 if (msg->attr_used >= msg->attr_size) {
562 size_t *nattr_pos;
563 int nlen = msg->attr_size * 2;
564
565 nattr_pos = os_realloc_array(msg->attr_pos, nlen,
566 sizeof(*msg->attr_pos));
567 if (nattr_pos == NULL)
568 return -1;
569
570 msg->attr_pos = nattr_pos;
571 msg->attr_size = nlen;
572 }
573
574 msg->attr_pos[msg->attr_used++] =
575 (unsigned char *) attr - wpabuf_head_u8(msg->buf);
576
577 return 0;
578}
579
580
581struct radius_attr_hdr *radius_msg_add_attr(struct radius_msg *msg, u8 type,
582 const u8 *data, size_t data_len)
583{
584 size_t buf_needed;
585 struct radius_attr_hdr *attr;
586
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);
590 return NULL;
591 }
592
593 buf_needed = sizeof(*attr) + data_len;
594
595 if (wpabuf_tailroom(msg->buf) < buf_needed) {
596 /* allocate more space for message buffer */
597 if (wpabuf_resize(&msg->buf, buf_needed) < 0)
598 return NULL;
599 msg->hdr = wpabuf_mhead(msg->buf);
600 }
601
602 attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr));
603 attr->type = type;
604 attr->length = sizeof(*attr) + data_len;
605 wpabuf_put_data(msg->buf, data, data_len);
606
607 if (radius_msg_add_attr_to_array(msg, attr))
608 return NULL;
609
610 return attr;
611}
612
613
614/**
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
619 *
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().
622 */
623struct radius_msg * radius_msg_parse(const u8 *data, size_t len)
624{
625 struct radius_msg *msg;
626 struct radius_hdr *hdr;
627 struct radius_attr_hdr *attr;
628 size_t msg_len;
629 unsigned char *pos, *end;
630
631 if (data == NULL || len < sizeof(*hdr))
632 return NULL;
633
634 hdr = (struct radius_hdr *) data;
635
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");
639 return NULL;
640 }
641
642 if (msg_len < len) {
643 wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after "
644 "RADIUS message", (unsigned long) len - msg_len);
645 }
646
647 msg = os_zalloc(sizeof(*msg));
648 if (msg == NULL)
649 return NULL;
650
651 msg->buf = wpabuf_alloc_copy(data, msg_len);
652 if (msg->buf == NULL || radius_msg_initialize(msg)) {
653 radius_msg_free(msg);
654 return NULL;
655 }
656 msg->hdr = wpabuf_mhead(msg->buf);
657
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);
661 while (pos < end) {
662 if ((size_t) (end - pos) < sizeof(*attr))
663 goto fail;
664
665 attr = (struct radius_attr_hdr *) pos;
666
667 if (pos + attr->length > end || attr->length < sizeof(*attr))
668 goto fail;
669
670 /* TODO: check that attr->length is suitable for attr->type */
671
672 if (radius_msg_add_attr_to_array(msg, attr))
673 goto fail;
674
675 pos += attr->length;
676 }
677
678 return msg;
679
680 fail:
681 radius_msg_free(msg);
682 return NULL;
683}
684
685
686int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len)
687{
688 const u8 *pos = data;
689 size_t left = data_len;
690
691 while (left > 0) {
692 int len;
693 if (left > RADIUS_MAX_ATTR_LEN)
694 len = RADIUS_MAX_ATTR_LEN;
695 else
696 len = left;
697
698 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE,
699 pos, len))
700 return 0;
701
702 pos += len;
703 left -= len;
704 }
705
706 return 1;
707}
708
709
710struct wpabuf * radius_msg_get_eap(struct radius_msg *msg)
711{
712 struct wpabuf *eap;
713 size_t len, i;
714 struct radius_attr_hdr *attr;
715
716 if (msg == NULL)
717 return NULL;
718
719 len = 0;
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);
725 }
726
727 if (len == 0)
728 return NULL;
729
730 eap = wpabuf_alloc(len);
731 if (eap == NULL)
732 return NULL;
733
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);
740 }
741 }
742
743 return eap;
744}
745
746
747int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret,
748 size_t secret_len, const u8 *req_auth)
749{
750 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
751 u8 orig_authenticator[16];
752 struct radius_attr_hdr *attr = NULL, *tmp;
753 size_t i;
754
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) {
758 if (attr != NULL) {
759 printf("Multiple Message-Authenticator "
760 "attributes in RADIUS message\n");
761 return 1;
762 }
763 attr = tmp;
764 }
765 }
766
767 if (attr == NULL) {
768 printf("No Message-Authenticator attribute found\n");
769 return 1;
770 }
771
772 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
773 os_memset(attr + 1, 0, MD5_MAC_LEN);
774 if (req_auth) {
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));
779 }
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);
783 if (req_auth) {
784 os_memcpy(msg->hdr->authenticator, orig_authenticator,
785 sizeof(orig_authenticator));
786 }
787
788 if (os_memcmp(orig, auth, MD5_MAC_LEN) != 0) {
789 printf("Invalid Message-Authenticator!\n");
790 return 1;
791 }
792
793 return 0;
794}
795
796
797int radius_msg_verify(struct radius_msg *msg, const u8 *secret,
798 size_t secret_len, struct radius_msg *sent_msg, int auth)
799{
800 const u8 *addr[4];
801 size_t len[4];
802 u8 hash[MD5_MAC_LEN];
803
804 if (sent_msg == NULL) {
805 printf("No matching Access-Request message found\n");
806 return 1;
807 }
808
809 if (auth &&
810 radius_msg_verify_msg_auth(msg, secret, secret_len,
811 sent_msg->hdr->authenticator)) {
812 return 1;
813 }
814
815 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
816 addr[0] = (u8 *) msg->hdr;
817 len[0] = 1 + 1 + 2;
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);
822 addr[3] = secret;
823 len[3] = secret_len;
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");
827 return 1;
828 }
829
830 return 0;
831}
832
833
834int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src,
835 u8 type)
836{
837 struct radius_attr_hdr *attr;
838 size_t i;
839 int count = 0;
840
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)))
846 return -1;
847 count++;
848 }
849 }
850
851 return count;
852}
853
854
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
858 * by the caller. */
859void radius_msg_make_authenticator(struct radius_msg *msg,
860 const u8 *data, size_t len)
861{
862 struct os_time tv;
863 long int l;
864 const u8 *addr[3];
865 size_t elen[3];
866
867 os_get_time(&tv);
868 l = os_random();
869 addr[0] = (u8 *) &tv;
870 elen[0] = sizeof(tv);
871 addr[1] = data;
872 elen[1] = len;
873 addr[2] = (u8 *) &l;
874 elen[2] = sizeof(l);
875 md5_vector(3, addr, elen, msg->hdr->authenticator);
876}
877
878
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().
884 */
885static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor,
886 u8 subtype, size_t *alen)
887{
888 u8 *data, *pos;
889 size_t i, len;
890
891 if (msg == NULL)
892 return NULL;
893
894 for (i = 0; i < msg->attr_used; i++) {
895 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
896 size_t left;
897 u32 vendor_id;
898 struct radius_attr_vendor *vhdr;
899
900 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC ||
901 attr->length < sizeof(*attr))
902 continue;
903
904 left = attr->length - sizeof(*attr);
905 if (left < 4)
906 continue;
907
908 pos = (u8 *) (attr + 1);
909
910 os_memcpy(&vendor_id, pos, 4);
911 pos += 4;
912 left -= 4;
913
914 if (ntohl(vendor_id) != vendor)
915 continue;
916
917 while (left >= sizeof(*vhdr)) {
918 vhdr = (struct radius_attr_vendor *) pos;
919 if (vhdr->vendor_length > left ||
920 vhdr->vendor_length < sizeof(*vhdr)) {
921 left = 0;
922 break;
923 }
924 if (vhdr->vendor_type != subtype) {
925 pos += vhdr->vendor_length;
926 left -= vhdr->vendor_length;
927 continue;
928 }
929
930 len = vhdr->vendor_length - sizeof(*vhdr);
931 data = os_malloc(len);
932 if (data == NULL)
933 return NULL;
934 os_memcpy(data, pos + sizeof(*vhdr), len);
935 if (alen)
936 *alen = len;
937 return data;
938 }
939 }
940
941 return NULL;
942}
943
944
945static 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)
948{
949 u8 *plain, *ppos, *res;
950 const u8 *pos;
951 size_t left, plen;
952 u8 hash[MD5_MAC_LEN];
953 int i, first = 1;
954 const u8 *addr[3];
955 size_t elen[3];
956
957 /* key: 16-bit salt followed by encrypted key info */
958
959 if (len < 2 + 16)
960 return NULL;
961
962 pos = key + 2;
963 left = len - 2;
964 if (left % 16) {
965 printf("Invalid ms key len %lu\n", (unsigned long) left);
966 return NULL;
967 }
968
969 plen = left;
970 ppos = plain = os_malloc(plen);
971 if (plain == NULL)
972 return NULL;
973 plain[0] = 0;
974
975 while (left > 0) {
976 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
977 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
978
979 addr[0] = secret;
980 elen[0] = secret_len;
981 if (first) {
982 addr[1] = req_authenticator;
983 elen[1] = MD5_MAC_LEN;
984 addr[2] = key;
985 elen[2] = 2; /* Salt */
986 } else {
987 addr[1] = pos - MD5_MAC_LEN;
988 elen[1] = MD5_MAC_LEN;
989 }
990 md5_vector(first ? 3 : 2, addr, elen, hash);
991 first = 0;
992
993 for (i = 0; i < MD5_MAC_LEN; i++)
994 *ppos++ = *pos++ ^ hash[i];
995 left -= MD5_MAC_LEN;
996 }
997
998 if (plain[0] == 0 || plain[0] > plen - 1) {
999 printf("Failed to decrypt MPPE key\n");
1000 os_free(plain);
1001 return NULL;
1002 }
1003
1004 res = os_malloc(plain[0]);
1005 if (res == NULL) {
1006 os_free(plain);
1007 return NULL;
1008 }
1009 os_memcpy(res, plain + 1, plain[0]);
1010 if (reslen)
1011 *reslen = plain[0];
1012 os_free(plain);
1013 return res;
1014}
1015
1016
1017static 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)
1021{
1022 int i, len, first = 1;
1023 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos;
1024 const u8 *addr[3];
1025 size_t _len[3];
1026
1027 WPA_PUT_BE16(saltbuf, salt);
1028
1029 len = 1 + key_len;
1030 if (len & 0x0f) {
1031 len = (len & 0xf0) + 16;
1032 }
1033 os_memset(ebuf, 0, len);
1034 ebuf[0] = key_len;
1035 os_memcpy(ebuf + 1, key, key_len);
1036
1037 *elen = len;
1038
1039 pos = ebuf;
1040 while (len > 0) {
1041 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1042 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1043 addr[0] = secret;
1044 _len[0] = secret_len;
1045 if (first) {
1046 addr[1] = req_authenticator;
1047 _len[1] = MD5_MAC_LEN;
1048 addr[2] = saltbuf;
1049 _len[2] = sizeof(saltbuf);
1050 } else {
1051 addr[1] = pos - MD5_MAC_LEN;
1052 _len[1] = MD5_MAC_LEN;
1053 }
1054 md5_vector(first ? 3 : 2, addr, _len, hash);
1055 first = 0;
1056
1057 for (i = 0; i < MD5_MAC_LEN; i++)
1058 *pos++ ^= hash[i];
1059
1060 len -= MD5_MAC_LEN;
1061 }
1062}
1063
1064
1065struct radius_ms_mppe_keys *
1066radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
1067 const u8 *secret, size_t secret_len)
1068{
1069 u8 *key;
1070 size_t keylen;
1071 struct radius_ms_mppe_keys *keys;
1072
1073 if (msg == NULL || sent_msg == NULL)
1074 return NULL;
1075
1076 keys = os_zalloc(sizeof(*keys));
1077 if (keys == NULL)
1078 return NULL;
1079
1080 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1081 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY,
1082 &keylen);
1083 if (key) {
1084 keys->send = decrypt_ms_key(key, keylen,
1085 sent_msg->hdr->authenticator,
1086 secret, secret_len,
1087 &keys->send_len);
1088 os_free(key);
1089 }
1090
1091 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1092 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY,
1093 &keylen);
1094 if (key) {
1095 keys->recv = decrypt_ms_key(key, keylen,
1096 sent_msg->hdr->authenticator,
1097 secret, secret_len,
1098 &keys->recv_len);
1099 os_free(key);
1100 }
1101
1102 return keys;
1103}
1104
1105
1106struct radius_ms_mppe_keys *
1107radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
1108 const u8 *secret, size_t secret_len)
1109{
1110 u8 *key;
1111 size_t keylen;
1112 struct radius_ms_mppe_keys *keys;
1113
1114 if (msg == NULL || sent_msg == NULL)
1115 return NULL;
1116
1117 keys = os_zalloc(sizeof(*keys));
1118 if (keys == NULL)
1119 return NULL;
1120
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,
1127 secret, secret_len,
1128 &keys->recv_len);
1129 }
1130 os_free(key);
1131
1132 return keys;
1133}
1134
1135
1136int 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)
1141{
1142 struct radius_attr_hdr *attr;
1143 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT);
1144 u8 *buf;
1145 struct radius_attr_vendor *vhdr;
1146 u8 *pos;
1147 size_t elen;
1148 int hlen;
1149 u16 salt;
1150
1151 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2;
1152
1153 /* MS-MPPE-Send-Key */
1154 buf = os_malloc(hlen + send_key_len + 16);
1155 if (buf == NULL) {
1156 return 0;
1157 }
1158 pos = buf;
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);
1166 pos += 2;
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);
1170
1171 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1172 buf, hlen + elen);
1173 os_free(buf);
1174 if (attr == NULL) {
1175 return 0;
1176 }
1177
1178 /* MS-MPPE-Recv-Key */
1179 buf = os_malloc(hlen + send_key_len + 16);
1180 if (buf == NULL) {
1181 return 0;
1182 }
1183 pos = buf;
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);
1189 salt ^= 1;
1190 WPA_PUT_BE16(pos, salt);
1191 pos += 2;
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);
1195
1196 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1197 buf, hlen + elen);
1198 os_free(buf);
1199 if (attr == NULL) {
1200 return 0;
1201 }
1202
1203 return 1;
1204}
1205
1206
1207/* Add User-Password attribute to a RADIUS message and encrypt it as specified
1208 * in RFC 2865, Chap. 5.2 */
1209struct radius_attr_hdr *
1210radius_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)
1213{
1214 u8 buf[128];
1215 size_t padlen, i, buf_len, pos;
1216 const u8 *addr[2];
1217 size_t len[2];
1218 u8 hash[16];
1219
1220 if (data_len > 128)
1221 return NULL;
1222
1223 os_memcpy(buf, data, data_len);
1224 buf_len = data_len;
1225
1226 padlen = data_len % 16;
1227 if (padlen && data_len < sizeof(buf)) {
1228 padlen = 16 - padlen;
1229 os_memset(buf + data_len, 0, padlen);
1230 buf_len += padlen;
1231 }
1232
1233 addr[0] = secret;
1234 len[0] = secret_len;
1235 addr[1] = msg->hdr->authenticator;
1236 len[1] = 16;
1237 md5_vector(2, addr, len, hash);
1238
1239 for (i = 0; i < 16; i++)
1240 buf[i] ^= hash[i];
1241 pos = 16;
1242
1243 while (pos < buf_len) {
1244 addr[0] = secret;
1245 len[0] = secret_len;
1246 addr[1] = &buf[pos - 16];
1247 len[1] = 16;
1248 md5_vector(2, addr, len, hash);
1249
1250 for (i = 0; i < 16; i++)
1251 buf[pos + i] ^= hash[i];
1252
1253 pos += 16;
1254 }
1255
1256 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD,
1257 buf, buf_len);
1258}
1259
1260
1261int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len)
1262{
1263 struct radius_attr_hdr *attr = NULL, *tmp;
1264 size_t i, dlen;
1265
1266 for (i = 0; i < msg->attr_used; i++) {
1267 tmp = radius_get_attr_hdr(msg, i);
1268 if (tmp->type == type) {
1269 attr = tmp;
1270 break;
1271 }
1272 }
1273
1274 if (!attr || attr->length < sizeof(*attr))
1275 return -1;
1276
1277 dlen = attr->length - sizeof(*attr);
1278 if (buf)
1279 os_memcpy(buf, (attr + 1), dlen > len ? len : dlen);
1280 return dlen;
1281}
1282
1283
1284int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf,
1285 size_t *len, const u8 *start)
1286{
1287 size_t i;
1288 struct radius_attr_hdr *attr = NULL, *tmp;
1289
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)) {
1294 attr = tmp;
1295 break;
1296 }
1297 }
1298
1299 if (!attr || attr->length < sizeof(*attr))
1300 return -1;
1301
1302 *buf = (u8 *) (attr + 1);
1303 *len = attr->length - sizeof(*attr);
1304 return 0;
1305}
1306
1307
1308int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len)
1309{
1310 size_t i;
1311 int count;
1312
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)
1317 count++;
1318 }
1319
1320 return count;
1321}
1322
1323
1324struct radius_tunnel_attrs {
1325 int tag_used;
1326 int type; /* Tunnel-Type */
1327 int medium_type; /* Tunnel-Medium-Type */
1328 int vlanid;
1329};
1330
1331
1332/**
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
1336 */
1337int radius_msg_get_vlanid(struct radius_msg *msg)
1338{
1339 struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun;
1340 size_t i;
1341 struct radius_attr_hdr *attr = NULL;
1342 const u8 *data;
1343 char buf[10];
1344 size_t dlen;
1345
1346 os_memset(&tunnel, 0, sizeof(tunnel));
1347
1348 for (i = 0; i < msg->attr_used; i++) {
1349 attr = radius_get_attr_hdr(msg, i);
1350 if (attr->length < sizeof(*attr))
1351 return -1;
1352 data = (const u8 *) (attr + 1);
1353 dlen = attr->length - sizeof(*attr);
1354 if (attr->length < 3)
1355 continue;
1356 if (data[0] >= RADIUS_TUNNEL_TAGS)
1357 tun = &tunnel[0];
1358 else
1359 tun = &tunnel[data[0]];
1360
1361 switch (attr->type) {
1362 case RADIUS_ATTR_TUNNEL_TYPE:
1363 if (attr->length != 6)
1364 break;
1365 tun->tag_used++;
1366 tun->type = WPA_GET_BE24(data + 1);
1367 break;
1368 case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE:
1369 if (attr->length != 6)
1370 break;
1371 tun->tag_used++;
1372 tun->medium_type = WPA_GET_BE24(data + 1);
1373 break;
1374 case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID:
1375 if (data[0] < RADIUS_TUNNEL_TAGS) {
1376 data++;
1377 dlen--;
1378 }
1379 if (dlen >= sizeof(buf))
1380 break;
1381 os_memcpy(buf, data, dlen);
1382 buf[dlen] = '\0';
1383 tun->tag_used++;
1384 tun->vlanid = atoi(buf);
1385 break;
1386 }
1387 }
1388
1389 for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) {
1390 tun = &tunnel[i];
1391 if (tun->tag_used &&
1392 tun->type == RADIUS_TUNNEL_TYPE_VLAN &&
1393 tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 &&
1394 tun->vlanid > 0)
1395 return tun->vlanid;
1396 }
1397
1398 return -1;
1399}
1400
1401
1402/**
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
1411 */
1412char * 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)
1415{
1416 u8 *buf = NULL;
1417 size_t buflen;
1418 const u8 *salt;
1419 u8 *str;
1420 const u8 *addr[3];
1421 size_t len[3];
1422 u8 hash[16];
1423 u8 *pos;
1424 size_t i, j = 0;
1425 struct radius_attr_hdr *attr;
1426 const u8 *data;
1427 size_t dlen;
1428 const u8 *fdata = NULL; /* points to found item */
1429 size_t fdlen = -1;
1430 char *ret = NULL;
1431
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);
1435 if (attr == NULL ||
1436 attr->type != RADIUS_ATTR_TUNNEL_PASSWORD) {
1437 continue;
1438 }
1439 if (attr->length <= 5)
1440 continue;
1441 data = (const u8 *) (attr + 1);
1442 dlen = attr->length - sizeof(*attr);
1443 if (dlen <= 3 || dlen % 16 != 3)
1444 continue;
1445 j++;
1446 if (j <= n)
1447 continue;
1448
1449 fdata = data;
1450 fdlen = dlen;
1451 break;
1452 }
1453 if (fdata == NULL)
1454 goto out;
1455
1456 /* alloc writable memory for decryption */
1457 buf = os_malloc(fdlen);
1458 if (buf == NULL)
1459 goto out;
1460 os_memcpy(buf, fdata, fdlen);
1461 buflen = fdlen;
1462
1463 /* init pointers */
1464 salt = buf + 1;
1465 str = buf + 3;
1466
1467 /* decrypt blocks */
1468 pos = buf + buflen - 16; /* last block */
1469 while (pos >= str + 16) { /* all but the first block */
1470 addr[0] = secret;
1471 len[0] = secret_len;
1472 addr[1] = pos - 16;
1473 len[1] = 16;
1474 md5_vector(2, addr, len, hash);
1475
1476 for (i = 0; i < 16; i++)
1477 pos[i] ^= hash[i];
1478
1479 pos -= 16;
1480 }
1481
1482 /* decrypt first block */
1483 if (str != pos)
1484 goto out;
1485 addr[0] = secret;
1486 len[0] = secret_len;
1487 addr[1] = sent_msg->hdr->authenticator;
1488 len[1] = 16;
1489 addr[2] = salt;
1490 len[2] = 2;
1491 md5_vector(3, addr, len, hash);
1492
1493 for (i = 0; i < 16; i++)
1494 pos[i] ^= hash[i];
1495
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 */
1500 goto out;
1501 }
1502 if (*keylen == 0) {
1503 /* empty password */
1504 goto out;
1505 }
1506
1507 /* copy passphrase into new buffer */
1508 ret = os_malloc(*keylen);
1509 if (ret)
1510 os_memcpy(ret, str + 1, *keylen);
1511
1512out:
1513 /* return new buffer */
1514 os_free(buf);
1515 return ret;
1516}
1517
1518
1519void radius_free_class(struct radius_class_data *c)
1520{
1521 size_t i;
1522 if (c == NULL)
1523 return;
1524 for (i = 0; i < c->count; i++)
1525 os_free(c->attr[i].data);
1526 os_free(c->attr);
1527 c->attr = NULL;
1528 c->count = 0;
1529}
1530
1531
1532int radius_copy_class(struct radius_class_data *dst,
1533 const struct radius_class_data *src)
1534{
1535 size_t i;
1536
1537 if (src->attr == NULL)
1538 return 0;
1539
1540 dst->attr = os_calloc(src->count, sizeof(struct radius_attr_data));
1541 if (dst->attr == NULL)
1542 return -1;
1543
1544 dst->count = 0;
1545
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)
1549 break;
1550 dst->count++;
1551 os_memcpy(dst->attr[i].data, src->attr[i].data,
1552 src->attr[i].len);
1553 dst->attr[i].len = src->attr[i].len;
1554 }
1555
1556 return 0;
1557}
1558
1559
1560u8 radius_msg_find_unlisted_attr(struct radius_msg *msg, u8 *attrs)
1561{
1562 size_t i, j;
1563 struct radius_attr_hdr *attr;
1564
1565 for (i = 0; i < msg->attr_used; i++) {
1566 attr = radius_get_attr_hdr(msg, i);
1567
1568 for (j = 0; attrs[j]; j++) {
1569 if (attr->type == attrs[j])
1570 break;
1571 }
1572
1573 if (attrs[j] == 0)
1574 return attr->type; /* unlisted attr */
1575 }
1576
1577 return 0;
1578}
WIP repository