1 /*
2 * RADIUS message processing
3 * Copyright (c) 2002-2009, 2011-2014, 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 */
21 struct 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
radius_msg_get_hdr(struct radius_msg * msg)52 struct radius_hdr * radius_msg_get_hdr(struct radius_msg *msg)
53 {
54 return msg->hdr;
55 }
56
57
radius_msg_get_buf(struct radius_msg * msg)58 struct wpabuf * radius_msg_get_buf(struct radius_msg *msg)
59 {
60 return msg->buf;
61 }
62
63
64 static struct radius_attr_hdr *
radius_get_attr_hdr(struct radius_msg * msg,int idx)65 radius_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
radius_msg_set_hdr(struct radius_msg * msg,u8 code,u8 identifier)72 static 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
radius_msg_initialize(struct radius_msg * msg)79 static 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 */
radius_msg_new(u8 code,u8 identifier)102 struct 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 */
radius_msg_free(struct radius_msg * msg)127 void 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
radius_code_string(u8 code)138 static 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
161 struct 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
170 static 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 { RADIUS_ATTR_EAP_KEY_NAME, "EAP-Key-Name", RADIUS_ATTR_HEXDUMP },
236 { RADIUS_ATTR_MOBILITY_DOMAIN_ID, "Mobility-Domain-Id",
237 RADIUS_ATTR_INT32 },
238 { RADIUS_ATTR_WLAN_HESSID, "WLAN-HESSID", RADIUS_ATTR_TEXT },
239 { RADIUS_ATTR_WLAN_PAIRWISE_CIPHER, "WLAN-Pairwise-Cipher",
240 RADIUS_ATTR_HEXDUMP },
241 { RADIUS_ATTR_WLAN_GROUP_CIPHER, "WLAN-Group-Cipher",
242 RADIUS_ATTR_HEXDUMP },
243 { RADIUS_ATTR_WLAN_AKM_SUITE, "WLAN-AKM-Suite",
244 RADIUS_ATTR_HEXDUMP },
245 { RADIUS_ATTR_WLAN_GROUP_MGMT_CIPHER, "WLAN-Group-Mgmt-Pairwise-Cipher",
246 RADIUS_ATTR_HEXDUMP },
247 };
248 #define RADIUS_ATTRS ARRAY_SIZE(radius_attrs)
249
250
radius_get_attr_type(u8 type)251 static struct radius_attr_type *radius_get_attr_type(u8 type)
252 {
253 size_t i;
254
255 for (i = 0; i < RADIUS_ATTRS; i++) {
256 if (type == radius_attrs[i].type)
257 return &radius_attrs[i];
258 }
259
260 return NULL;
261 }
262
263
radius_msg_dump_attr(struct radius_attr_hdr * hdr)264 static void radius_msg_dump_attr(struct radius_attr_hdr *hdr)
265 {
266 struct radius_attr_type *attr;
267 int len;
268 unsigned char *pos;
269 char buf[1000];
270
271 attr = radius_get_attr_type(hdr->type);
272
273 wpa_printf(MSG_INFO, " Attribute %d (%s) length=%d",
274 hdr->type, attr ? attr->name : "?Unknown?", hdr->length);
275
276 if (attr == NULL || hdr->length < sizeof(struct radius_attr_hdr))
277 return;
278
279 len = hdr->length - sizeof(struct radius_attr_hdr);
280 pos = (unsigned char *) (hdr + 1);
281
282 switch (attr->data_type) {
283 case RADIUS_ATTR_TEXT:
284 printf_encode(buf, sizeof(buf), pos, len);
285 wpa_printf(MSG_INFO, " Value: '%s'", buf);
286 break;
287
288 case RADIUS_ATTR_IP:
289 if (len == 4) {
290 struct in_addr addr;
291 os_memcpy(&addr, pos, 4);
292 wpa_printf(MSG_INFO, " Value: %s",
293 inet_ntoa(addr));
294 } else {
295 wpa_printf(MSG_INFO, " Invalid IP address length %d",
296 len);
297 }
298 break;
299
300 #ifdef CONFIG_IPV6
301 case RADIUS_ATTR_IPV6:
302 if (len == 16) {
303 const char *atxt;
304 struct in6_addr *addr = (struct in6_addr *) pos;
305 atxt = inet_ntop(AF_INET6, addr, buf, sizeof(buf));
306 wpa_printf(MSG_INFO, " Value: %s",
307 atxt ? atxt : "?");
308 } else {
309 wpa_printf(MSG_INFO, " Invalid IPv6 address length %d",
310 len);
311 }
312 break;
313 #endif /* CONFIG_IPV6 */
314
315 case RADIUS_ATTR_HEXDUMP:
316 case RADIUS_ATTR_UNDIST:
317 wpa_snprintf_hex(buf, sizeof(buf), pos, len);
318 wpa_printf(MSG_INFO, " Value: %s", buf);
319 break;
320
321 case RADIUS_ATTR_INT32:
322 if (len == 4)
323 wpa_printf(MSG_INFO, " Value: %u",
324 WPA_GET_BE32(pos));
325 else
326 wpa_printf(MSG_INFO, " Invalid INT32 length %d",
327 len);
328 break;
329
330 default:
331 break;
332 }
333 }
334
335
radius_msg_dump(struct radius_msg * msg)336 void radius_msg_dump(struct radius_msg *msg)
337 {
338 size_t i;
339
340 wpa_printf(MSG_INFO, "RADIUS message: code=%d (%s) identifier=%d length=%d",
341 msg->hdr->code, radius_code_string(msg->hdr->code),
342 msg->hdr->identifier, be_to_host16(msg->hdr->length));
343
344 for (i = 0; i < msg->attr_used; i++) {
345 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
346 radius_msg_dump_attr(attr);
347 }
348 }
349
350
radius_msg_finish(struct radius_msg * msg,const u8 * secret,size_t secret_len)351 int radius_msg_finish(struct radius_msg *msg, const u8 *secret,
352 size_t secret_len)
353 {
354 if (secret) {
355 u8 auth[MD5_MAC_LEN];
356 struct radius_attr_hdr *attr;
357
358 os_memset(auth, 0, MD5_MAC_LEN);
359 attr = radius_msg_add_attr(msg,
360 RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
361 auth, MD5_MAC_LEN);
362 if (attr == NULL) {
363 wpa_printf(MSG_WARNING, "RADIUS: Could not add "
364 "Message-Authenticator");
365 return -1;
366 }
367 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
368 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
369 wpabuf_len(msg->buf), (u8 *) (attr + 1));
370 } else
371 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
372
373 if (wpabuf_len(msg->buf) > 0xffff) {
374 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
375 (unsigned long) wpabuf_len(msg->buf));
376 return -1;
377 }
378 return 0;
379 }
380
381
radius_msg_finish_srv(struct radius_msg * msg,const u8 * secret,size_t secret_len,const u8 * req_authenticator)382 int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret,
383 size_t secret_len, const u8 *req_authenticator)
384 {
385 u8 auth[MD5_MAC_LEN];
386 struct radius_attr_hdr *attr;
387 const u8 *addr[4];
388 size_t len[4];
389
390 os_memset(auth, 0, MD5_MAC_LEN);
391 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
392 auth, MD5_MAC_LEN);
393 if (attr == NULL) {
394 wpa_printf(MSG_ERROR, "WARNING: Could not add Message-Authenticator");
395 return -1;
396 }
397 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
398 os_memcpy(msg->hdr->authenticator, req_authenticator,
399 sizeof(msg->hdr->authenticator));
400 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
401 wpabuf_len(msg->buf), (u8 *) (attr + 1));
402
403 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
404 addr[0] = (u8 *) msg->hdr;
405 len[0] = 1 + 1 + 2;
406 addr[1] = req_authenticator;
407 len[1] = MD5_MAC_LEN;
408 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
409 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
410 addr[3] = secret;
411 len[3] = secret_len;
412 md5_vector(4, addr, len, msg->hdr->authenticator);
413
414 if (wpabuf_len(msg->buf) > 0xffff) {
415 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
416 (unsigned long) wpabuf_len(msg->buf));
417 return -1;
418 }
419 return 0;
420 }
421
422
radius_msg_finish_das_resp(struct radius_msg * msg,const u8 * secret,size_t secret_len,const struct radius_hdr * req_hdr)423 int radius_msg_finish_das_resp(struct radius_msg *msg, const u8 *secret,
424 size_t secret_len,
425 const struct radius_hdr *req_hdr)
426 {
427 const u8 *addr[2];
428 size_t len[2];
429 u8 auth[MD5_MAC_LEN];
430 struct radius_attr_hdr *attr;
431
432 os_memset(auth, 0, MD5_MAC_LEN);
433 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
434 auth, MD5_MAC_LEN);
435 if (attr == NULL) {
436 wpa_printf(MSG_WARNING, "Could not add Message-Authenticator");
437 return -1;
438 }
439
440 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
441 os_memcpy(msg->hdr->authenticator, req_hdr->authenticator, 16);
442 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
443 wpabuf_len(msg->buf), (u8 *) (attr + 1));
444
445 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
446 addr[0] = wpabuf_head_u8(msg->buf);
447 len[0] = wpabuf_len(msg->buf);
448 addr[1] = secret;
449 len[1] = secret_len;
450 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0)
451 return -1;
452
453 if (wpabuf_len(msg->buf) > 0xffff) {
454 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
455 (unsigned long) wpabuf_len(msg->buf));
456 return -1;
457 }
458 return 0;
459 }
460
461
radius_msg_finish_acct(struct radius_msg * msg,const u8 * secret,size_t secret_len)462 void radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret,
463 size_t secret_len)
464 {
465 const u8 *addr[2];
466 size_t len[2];
467
468 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
469 os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN);
470 addr[0] = wpabuf_head(msg->buf);
471 len[0] = wpabuf_len(msg->buf);
472 addr[1] = secret;
473 len[1] = secret_len;
474 md5_vector(2, addr, len, msg->hdr->authenticator);
475
476 if (wpabuf_len(msg->buf) > 0xffff) {
477 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
478 (unsigned long) wpabuf_len(msg->buf));
479 }
480 }
481
482
radius_msg_finish_acct_resp(struct radius_msg * msg,const u8 * secret,size_t secret_len,const u8 * req_authenticator)483 void radius_msg_finish_acct_resp(struct radius_msg *msg, const u8 *secret,
484 size_t secret_len, const u8 *req_authenticator)
485 {
486 const u8 *addr[2];
487 size_t len[2];
488
489 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
490 os_memcpy(msg->hdr->authenticator, req_authenticator, MD5_MAC_LEN);
491 addr[0] = wpabuf_head(msg->buf);
492 len[0] = wpabuf_len(msg->buf);
493 addr[1] = secret;
494 len[1] = secret_len;
495 md5_vector(2, addr, len, msg->hdr->authenticator);
496
497 if (wpabuf_len(msg->buf) > 0xffff) {
498 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
499 (unsigned long) wpabuf_len(msg->buf));
500 }
501 }
502
503
radius_msg_verify_acct_req(struct radius_msg * msg,const u8 * secret,size_t secret_len)504 int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret,
505 size_t secret_len)
506 {
507 const u8 *addr[4];
508 size_t len[4];
509 u8 zero[MD5_MAC_LEN];
510 u8 hash[MD5_MAC_LEN];
511
512 os_memset(zero, 0, sizeof(zero));
513 addr[0] = (u8 *) msg->hdr;
514 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
515 addr[1] = zero;
516 len[1] = MD5_MAC_LEN;
517 addr[2] = (u8 *) (msg->hdr + 1);
518 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
519 addr[3] = secret;
520 len[3] = secret_len;
521 md5_vector(4, addr, len, hash);
522 return os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0;
523 }
524
525
radius_msg_verify_das_req(struct radius_msg * msg,const u8 * secret,size_t secret_len)526 int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret,
527 size_t secret_len)
528 {
529 const u8 *addr[4];
530 size_t len[4];
531 u8 zero[MD5_MAC_LEN];
532 u8 hash[MD5_MAC_LEN];
533 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
534 u8 orig_authenticator[16];
535
536 struct radius_attr_hdr *attr = NULL, *tmp;
537 size_t i;
538
539 os_memset(zero, 0, sizeof(zero));
540 addr[0] = (u8 *) msg->hdr;
541 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
542 addr[1] = zero;
543 len[1] = MD5_MAC_LEN;
544 addr[2] = (u8 *) (msg->hdr + 1);
545 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
546 addr[3] = secret;
547 len[3] = secret_len;
548 md5_vector(4, addr, len, hash);
549 if (os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0)
550 return 1;
551
552 for (i = 0; i < msg->attr_used; i++) {
553 tmp = radius_get_attr_hdr(msg, i);
554 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
555 if (attr != NULL) {
556 wpa_printf(MSG_WARNING, "Multiple "
557 "Message-Authenticator attributes "
558 "in RADIUS message");
559 return 1;
560 }
561 attr = tmp;
562 }
563 }
564
565 if (attr == NULL) {
566 /* Message-Authenticator is MAY; not required */
567 return 0;
568 }
569
570 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
571 os_memset(attr + 1, 0, MD5_MAC_LEN);
572 os_memcpy(orig_authenticator, msg->hdr->authenticator,
573 sizeof(orig_authenticator));
574 os_memset(msg->hdr->authenticator, 0,
575 sizeof(msg->hdr->authenticator));
576 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
577 wpabuf_len(msg->buf), auth);
578 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
579 os_memcpy(msg->hdr->authenticator, orig_authenticator,
580 sizeof(orig_authenticator));
581
582 return os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0;
583 }
584
585
radius_msg_add_attr_to_array(struct radius_msg * msg,struct radius_attr_hdr * attr)586 static int radius_msg_add_attr_to_array(struct radius_msg *msg,
587 struct radius_attr_hdr *attr)
588 {
589 if (msg->attr_used >= msg->attr_size) {
590 size_t *nattr_pos;
591 int nlen = msg->attr_size * 2;
592
593 nattr_pos = os_realloc_array(msg->attr_pos, nlen,
594 sizeof(*msg->attr_pos));
595 if (nattr_pos == NULL)
596 return -1;
597
598 msg->attr_pos = nattr_pos;
599 msg->attr_size = nlen;
600 }
601
602 msg->attr_pos[msg->attr_used++] =
603 (unsigned char *) attr - wpabuf_head_u8(msg->buf);
604
605 return 0;
606 }
607
608
radius_msg_add_attr(struct radius_msg * msg,u8 type,const u8 * data,size_t data_len)609 struct radius_attr_hdr *radius_msg_add_attr(struct radius_msg *msg, u8 type,
610 const u8 *data, size_t data_len)
611 {
612 size_t buf_needed;
613 struct radius_attr_hdr *attr;
614
615 if (data_len > RADIUS_MAX_ATTR_LEN) {
616 wpa_printf(MSG_ERROR, "radius_msg_add_attr: too long attribute (%lu bytes)",
617 (unsigned long) data_len);
618 return NULL;
619 }
620
621 buf_needed = sizeof(*attr) + data_len;
622
623 if (wpabuf_tailroom(msg->buf) < buf_needed) {
624 /* allocate more space for message buffer */
625 if (wpabuf_resize(&msg->buf, buf_needed) < 0)
626 return NULL;
627 msg->hdr = wpabuf_mhead(msg->buf);
628 }
629
630 attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr));
631 attr->type = type;
632 attr->length = sizeof(*attr) + data_len;
633 wpabuf_put_data(msg->buf, data, data_len);
634
635 if (radius_msg_add_attr_to_array(msg, attr))
636 return NULL;
637
638 return attr;
639 }
640
641
642 /**
643 * radius_msg_parse - Parse a RADIUS message
644 * @data: RADIUS message to be parsed
645 * @len: Length of data buffer in octets
646 * Returns: Parsed RADIUS message or %NULL on failure
647 *
648 * This parses a RADIUS message and makes a copy of its data. The caller is
649 * responsible for freeing the returned data with radius_msg_free().
650 */
radius_msg_parse(const u8 * data,size_t len)651 struct radius_msg * radius_msg_parse(const u8 *data, size_t len)
652 {
653 struct radius_msg *msg;
654 struct radius_hdr *hdr;
655 struct radius_attr_hdr *attr;
656 size_t msg_len;
657 unsigned char *pos, *end;
658
659 if (data == NULL || len < sizeof(*hdr))
660 return NULL;
661
662 hdr = (struct radius_hdr *) data;
663
664 msg_len = be_to_host16(hdr->length);
665 if (msg_len < sizeof(*hdr) || msg_len > len) {
666 wpa_printf(MSG_INFO, "RADIUS: Invalid message length");
667 return NULL;
668 }
669
670 if (msg_len < len) {
671 wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after "
672 "RADIUS message", (unsigned long) len - msg_len);
673 }
674
675 msg = os_zalloc(sizeof(*msg));
676 if (msg == NULL)
677 return NULL;
678
679 msg->buf = wpabuf_alloc_copy(data, msg_len);
680 if (msg->buf == NULL || radius_msg_initialize(msg)) {
681 radius_msg_free(msg);
682 return NULL;
683 }
684 msg->hdr = wpabuf_mhead(msg->buf);
685
686 /* parse attributes */
687 pos = wpabuf_mhead_u8(msg->buf) + sizeof(struct radius_hdr);
688 end = wpabuf_mhead_u8(msg->buf) + wpabuf_len(msg->buf);
689 while (pos < end) {
690 if ((size_t) (end - pos) < sizeof(*attr))
691 goto fail;
692
693 attr = (struct radius_attr_hdr *) pos;
694
695 if (pos + attr->length > end || attr->length < sizeof(*attr))
696 goto fail;
697
698 /* TODO: check that attr->length is suitable for attr->type */
699
700 if (radius_msg_add_attr_to_array(msg, attr))
701 goto fail;
702
703 pos += attr->length;
704 }
705
706 return msg;
707
708 fail:
709 radius_msg_free(msg);
710 return NULL;
711 }
712
713
radius_msg_add_eap(struct radius_msg * msg,const u8 * data,size_t data_len)714 int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len)
715 {
716 const u8 *pos = data;
717 size_t left = data_len;
718
719 while (left > 0) {
720 int len;
721 if (left > RADIUS_MAX_ATTR_LEN)
722 len = RADIUS_MAX_ATTR_LEN;
723 else
724 len = left;
725
726 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE,
727 pos, len))
728 return 0;
729
730 pos += len;
731 left -= len;
732 }
733
734 return 1;
735 }
736
737
radius_msg_get_eap(struct radius_msg * msg)738 struct wpabuf * radius_msg_get_eap(struct radius_msg *msg)
739 {
740 struct wpabuf *eap;
741 size_t len, i;
742 struct radius_attr_hdr *attr;
743
744 if (msg == NULL)
745 return NULL;
746
747 len = 0;
748 for (i = 0; i < msg->attr_used; i++) {
749 attr = radius_get_attr_hdr(msg, i);
750 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
751 attr->length > sizeof(struct radius_attr_hdr))
752 len += attr->length - sizeof(struct radius_attr_hdr);
753 }
754
755 if (len == 0)
756 return NULL;
757
758 eap = wpabuf_alloc(len);
759 if (eap == NULL)
760 return NULL;
761
762 for (i = 0; i < msg->attr_used; i++) {
763 attr = radius_get_attr_hdr(msg, i);
764 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
765 attr->length > sizeof(struct radius_attr_hdr)) {
766 int flen = attr->length - sizeof(*attr);
767 wpabuf_put_data(eap, attr + 1, flen);
768 }
769 }
770
771 return eap;
772 }
773
774
radius_msg_verify_msg_auth(struct radius_msg * msg,const u8 * secret,size_t secret_len,const u8 * req_auth)775 int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret,
776 size_t secret_len, const u8 *req_auth)
777 {
778 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
779 u8 orig_authenticator[16];
780 struct radius_attr_hdr *attr = NULL, *tmp;
781 size_t i;
782
783 for (i = 0; i < msg->attr_used; i++) {
784 tmp = radius_get_attr_hdr(msg, i);
785 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
786 if (attr != NULL) {
787 wpa_printf(MSG_INFO, "Multiple Message-Authenticator attributes in RADIUS message");
788 return 1;
789 }
790 attr = tmp;
791 }
792 }
793
794 if (attr == NULL) {
795 wpa_printf(MSG_INFO, "No Message-Authenticator attribute found");
796 return 1;
797 }
798
799 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
800 os_memset(attr + 1, 0, MD5_MAC_LEN);
801 if (req_auth) {
802 os_memcpy(orig_authenticator, msg->hdr->authenticator,
803 sizeof(orig_authenticator));
804 os_memcpy(msg->hdr->authenticator, req_auth,
805 sizeof(msg->hdr->authenticator));
806 }
807 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
808 wpabuf_len(msg->buf), auth);
809 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
810 if (req_auth) {
811 os_memcpy(msg->hdr->authenticator, orig_authenticator,
812 sizeof(orig_authenticator));
813 }
814
815 if (os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0) {
816 wpa_printf(MSG_INFO, "Invalid Message-Authenticator!");
817 return 1;
818 }
819
820 return 0;
821 }
822
823
radius_msg_verify(struct radius_msg * msg,const u8 * secret,size_t secret_len,struct radius_msg * sent_msg,int auth)824 int radius_msg_verify(struct radius_msg *msg, const u8 *secret,
825 size_t secret_len, struct radius_msg *sent_msg, int auth)
826 {
827 const u8 *addr[4];
828 size_t len[4];
829 u8 hash[MD5_MAC_LEN];
830
831 if (sent_msg == NULL) {
832 wpa_printf(MSG_INFO, "No matching Access-Request message found");
833 return 1;
834 }
835
836 if (auth &&
837 radius_msg_verify_msg_auth(msg, secret, secret_len,
838 sent_msg->hdr->authenticator)) {
839 return 1;
840 }
841
842 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
843 addr[0] = (u8 *) msg->hdr;
844 len[0] = 1 + 1 + 2;
845 addr[1] = sent_msg->hdr->authenticator;
846 len[1] = MD5_MAC_LEN;
847 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
848 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
849 addr[3] = secret;
850 len[3] = secret_len;
851 md5_vector(4, addr, len, hash);
852 if (os_memcmp_const(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) {
853 wpa_printf(MSG_INFO, "Response Authenticator invalid!");
854 return 1;
855 }
856
857 return 0;
858 }
859
860
radius_msg_copy_attr(struct radius_msg * dst,struct radius_msg * src,u8 type)861 int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src,
862 u8 type)
863 {
864 struct radius_attr_hdr *attr;
865 size_t i;
866 int count = 0;
867
868 for (i = 0; i < src->attr_used; i++) {
869 attr = radius_get_attr_hdr(src, i);
870 if (attr->type == type && attr->length >= sizeof(*attr)) {
871 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1),
872 attr->length - sizeof(*attr)))
873 return -1;
874 count++;
875 }
876 }
877
878 return count;
879 }
880
881
882 /* Create Request Authenticator. The value should be unique over the lifetime
883 * of the shared secret between authenticator and authentication server.
884 * Use one-way MD5 hash calculated from current timestamp and some data given
885 * by the caller. */
radius_msg_make_authenticator(struct radius_msg * msg,const u8 * data,size_t len)886 void radius_msg_make_authenticator(struct radius_msg *msg,
887 const u8 *data, size_t len)
888 {
889 struct os_time tv;
890 long int l;
891 const u8 *addr[3];
892 size_t elen[3];
893
894 os_get_time(&tv);
895 l = os_random();
896 addr[0] = (u8 *) &tv;
897 elen[0] = sizeof(tv);
898 addr[1] = data;
899 elen[1] = len;
900 addr[2] = (u8 *) &l;
901 elen[2] = sizeof(l);
902 md5_vector(3, addr, elen, msg->hdr->authenticator);
903 }
904
905
906 /* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message.
907 * Returns the Attribute payload and sets alen to indicate the length of the
908 * payload if a vendor attribute with subtype is found, otherwise returns NULL.
909 * The returned payload is allocated with os_malloc() and caller must free it
910 * by calling os_free().
911 */
radius_msg_get_vendor_attr(struct radius_msg * msg,u32 vendor,u8 subtype,size_t * alen)912 static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor,
913 u8 subtype, size_t *alen)
914 {
915 u8 *data, *pos;
916 size_t i, len;
917
918 if (msg == NULL)
919 return NULL;
920
921 for (i = 0; i < msg->attr_used; i++) {
922 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
923 size_t left;
924 u32 vendor_id;
925 struct radius_attr_vendor *vhdr;
926
927 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC ||
928 attr->length < sizeof(*attr))
929 continue;
930
931 left = attr->length - sizeof(*attr);
932 if (left < 4)
933 continue;
934
935 pos = (u8 *) (attr + 1);
936
937 os_memcpy(&vendor_id, pos, 4);
938 pos += 4;
939 left -= 4;
940
941 if (ntohl(vendor_id) != vendor)
942 continue;
943
944 while (left >= sizeof(*vhdr)) {
945 vhdr = (struct radius_attr_vendor *) pos;
946 if (vhdr->vendor_length > left ||
947 vhdr->vendor_length < sizeof(*vhdr)) {
948 left = 0;
949 break;
950 }
951 if (vhdr->vendor_type != subtype) {
952 pos += vhdr->vendor_length;
953 left -= vhdr->vendor_length;
954 continue;
955 }
956
957 len = vhdr->vendor_length - sizeof(*vhdr);
958 data = os_malloc(len);
959 if (data == NULL)
960 return NULL;
961 os_memcpy(data, pos + sizeof(*vhdr), len);
962 if (alen)
963 *alen = len;
964 return data;
965 }
966 }
967
968 return NULL;
969 }
970
971
decrypt_ms_key(const u8 * key,size_t len,const u8 * req_authenticator,const u8 * secret,size_t secret_len,size_t * reslen)972 static u8 * decrypt_ms_key(const u8 *key, size_t len,
973 const u8 *req_authenticator,
974 const u8 *secret, size_t secret_len, size_t *reslen)
975 {
976 u8 *plain, *ppos, *res;
977 const u8 *pos;
978 size_t left, plen;
979 u8 hash[MD5_MAC_LEN];
980 int i, first = 1;
981 const u8 *addr[3];
982 size_t elen[3];
983
984 /* key: 16-bit salt followed by encrypted key info */
985
986 if (len < 2 + 16)
987 return NULL;
988
989 pos = key + 2;
990 left = len - 2;
991 if (left % 16) {
992 wpa_printf(MSG_INFO, "Invalid ms key len %lu",
993 (unsigned long) left);
994 return NULL;
995 }
996
997 plen = left;
998 ppos = plain = os_malloc(plen);
999 if (plain == NULL)
1000 return NULL;
1001 plain[0] = 0;
1002
1003 while (left > 0) {
1004 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1005 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1006
1007 addr[0] = secret;
1008 elen[0] = secret_len;
1009 if (first) {
1010 addr[1] = req_authenticator;
1011 elen[1] = MD5_MAC_LEN;
1012 addr[2] = key;
1013 elen[2] = 2; /* Salt */
1014 } else {
1015 addr[1] = pos - MD5_MAC_LEN;
1016 elen[1] = MD5_MAC_LEN;
1017 }
1018 md5_vector(first ? 3 : 2, addr, elen, hash);
1019 first = 0;
1020
1021 for (i = 0; i < MD5_MAC_LEN; i++)
1022 *ppos++ = *pos++ ^ hash[i];
1023 left -= MD5_MAC_LEN;
1024 }
1025
1026 if (plain[0] == 0 || plain[0] > plen - 1) {
1027 wpa_printf(MSG_INFO, "Failed to decrypt MPPE key");
1028 os_free(plain);
1029 return NULL;
1030 }
1031
1032 res = os_malloc(plain[0]);
1033 if (res == NULL) {
1034 os_free(plain);
1035 return NULL;
1036 }
1037 os_memcpy(res, plain + 1, plain[0]);
1038 if (reslen)
1039 *reslen = plain[0];
1040 os_free(plain);
1041 return res;
1042 }
1043
1044
encrypt_ms_key(const u8 * key,size_t key_len,u16 salt,const u8 * req_authenticator,const u8 * secret,size_t secret_len,u8 * ebuf,size_t * elen)1045 static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt,
1046 const u8 *req_authenticator,
1047 const u8 *secret, size_t secret_len,
1048 u8 *ebuf, size_t *elen)
1049 {
1050 int i, len, first = 1;
1051 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos;
1052 const u8 *addr[3];
1053 size_t _len[3];
1054
1055 WPA_PUT_BE16(saltbuf, salt);
1056
1057 len = 1 + key_len;
1058 if (len & 0x0f) {
1059 len = (len & 0xf0) + 16;
1060 }
1061 os_memset(ebuf, 0, len);
1062 ebuf[0] = key_len;
1063 os_memcpy(ebuf + 1, key, key_len);
1064
1065 *elen = len;
1066
1067 pos = ebuf;
1068 while (len > 0) {
1069 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1070 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1071 addr[0] = secret;
1072 _len[0] = secret_len;
1073 if (first) {
1074 addr[1] = req_authenticator;
1075 _len[1] = MD5_MAC_LEN;
1076 addr[2] = saltbuf;
1077 _len[2] = sizeof(saltbuf);
1078 } else {
1079 addr[1] = pos - MD5_MAC_LEN;
1080 _len[1] = MD5_MAC_LEN;
1081 }
1082 md5_vector(first ? 3 : 2, addr, _len, hash);
1083 first = 0;
1084
1085 for (i = 0; i < MD5_MAC_LEN; i++)
1086 *pos++ ^= hash[i];
1087
1088 len -= MD5_MAC_LEN;
1089 }
1090 }
1091
1092
1093 struct radius_ms_mppe_keys *
radius_msg_get_ms_keys(struct radius_msg * msg,struct radius_msg * sent_msg,const u8 * secret,size_t secret_len)1094 radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
1095 const u8 *secret, size_t secret_len)
1096 {
1097 u8 *key;
1098 size_t keylen;
1099 struct radius_ms_mppe_keys *keys;
1100
1101 if (msg == NULL || sent_msg == NULL)
1102 return NULL;
1103
1104 keys = os_zalloc(sizeof(*keys));
1105 if (keys == NULL)
1106 return NULL;
1107
1108 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1109 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY,
1110 &keylen);
1111 if (key) {
1112 keys->send = decrypt_ms_key(key, keylen,
1113 sent_msg->hdr->authenticator,
1114 secret, secret_len,
1115 &keys->send_len);
1116 os_free(key);
1117 }
1118
1119 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1120 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY,
1121 &keylen);
1122 if (key) {
1123 keys->recv = decrypt_ms_key(key, keylen,
1124 sent_msg->hdr->authenticator,
1125 secret, secret_len,
1126 &keys->recv_len);
1127 os_free(key);
1128 }
1129
1130 return keys;
1131 }
1132
1133
1134 struct radius_ms_mppe_keys *
radius_msg_get_cisco_keys(struct radius_msg * msg,struct radius_msg * sent_msg,const u8 * secret,size_t secret_len)1135 radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
1136 const u8 *secret, size_t secret_len)
1137 {
1138 u8 *key;
1139 size_t keylen;
1140 struct radius_ms_mppe_keys *keys;
1141
1142 if (msg == NULL || sent_msg == NULL)
1143 return NULL;
1144
1145 keys = os_zalloc(sizeof(*keys));
1146 if (keys == NULL)
1147 return NULL;
1148
1149 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO,
1150 RADIUS_CISCO_AV_PAIR, &keylen);
1151 if (key && keylen == 51 &&
1152 os_memcmp(key, "leap:session-key=", 17) == 0) {
1153 keys->recv = decrypt_ms_key(key + 17, keylen - 17,
1154 sent_msg->hdr->authenticator,
1155 secret, secret_len,
1156 &keys->recv_len);
1157 }
1158 os_free(key);
1159
1160 return keys;
1161 }
1162
1163
radius_msg_add_mppe_keys(struct radius_msg * msg,const u8 * req_authenticator,const u8 * secret,size_t secret_len,const u8 * send_key,size_t send_key_len,const u8 * recv_key,size_t recv_key_len)1164 int radius_msg_add_mppe_keys(struct radius_msg *msg,
1165 const u8 *req_authenticator,
1166 const u8 *secret, size_t secret_len,
1167 const u8 *send_key, size_t send_key_len,
1168 const u8 *recv_key, size_t recv_key_len)
1169 {
1170 struct radius_attr_hdr *attr;
1171 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT);
1172 u8 *buf;
1173 struct radius_attr_vendor *vhdr;
1174 u8 *pos;
1175 size_t elen;
1176 int hlen;
1177 u16 salt;
1178
1179 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2;
1180
1181 /* MS-MPPE-Send-Key */
1182 buf = os_malloc(hlen + send_key_len + 16);
1183 if (buf == NULL) {
1184 return 0;
1185 }
1186 pos = buf;
1187 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1188 pos += sizeof(vendor_id);
1189 vhdr = (struct radius_attr_vendor *) pos;
1190 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY;
1191 pos = (u8 *) (vhdr + 1);
1192 salt = os_random() | 0x8000;
1193 WPA_PUT_BE16(pos, salt);
1194 pos += 2;
1195 encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret,
1196 secret_len, pos, &elen);
1197 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1198
1199 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1200 buf, hlen + elen);
1201 os_free(buf);
1202 if (attr == NULL) {
1203 return 0;
1204 }
1205
1206 /* MS-MPPE-Recv-Key */
1207 buf = os_malloc(hlen + send_key_len + 16);
1208 if (buf == NULL) {
1209 return 0;
1210 }
1211 pos = buf;
1212 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1213 pos += sizeof(vendor_id);
1214 vhdr = (struct radius_attr_vendor *) pos;
1215 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY;
1216 pos = (u8 *) (vhdr + 1);
1217 salt ^= 1;
1218 WPA_PUT_BE16(pos, salt);
1219 pos += 2;
1220 encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret,
1221 secret_len, pos, &elen);
1222 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1223
1224 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1225 buf, hlen + elen);
1226 os_free(buf);
1227 if (attr == NULL) {
1228 return 0;
1229 }
1230
1231 return 1;
1232 }
1233
1234
radius_msg_add_wfa(struct radius_msg * msg,u8 subtype,const u8 * data,size_t len)1235 int radius_msg_add_wfa(struct radius_msg *msg, u8 subtype, const u8 *data,
1236 size_t len)
1237 {
1238 struct radius_attr_hdr *attr;
1239 u8 *buf, *pos;
1240 size_t alen;
1241
1242 alen = 4 + 2 + len;
1243 buf = os_malloc(alen);
1244 if (buf == NULL)
1245 return 0;
1246 pos = buf;
1247 WPA_PUT_BE32(pos, RADIUS_VENDOR_ID_WFA);
1248 pos += 4;
1249 *pos++ = subtype;
1250 *pos++ = 2 + len;
1251 os_memcpy(pos, data, len);
1252 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1253 buf, alen);
1254 os_free(buf);
1255 if (attr == NULL)
1256 return 0;
1257
1258 return 1;
1259 }
1260
1261
radius_user_password_hide(struct radius_msg * msg,const u8 * data,size_t data_len,const u8 * secret,size_t secret_len,u8 * buf,size_t buf_len)1262 int radius_user_password_hide(struct radius_msg *msg,
1263 const u8 *data, size_t data_len,
1264 const u8 *secret, size_t secret_len,
1265 u8 *buf, size_t buf_len)
1266 {
1267 size_t padlen, i, pos;
1268 const u8 *addr[2];
1269 size_t len[2];
1270 u8 hash[16];
1271
1272 if (data_len + 16 > buf_len)
1273 return -1;
1274
1275 os_memcpy(buf, data, data_len);
1276
1277 padlen = data_len % 16;
1278 if (padlen && data_len < buf_len) {
1279 padlen = 16 - padlen;
1280 os_memset(buf + data_len, 0, padlen);
1281 buf_len = data_len + padlen;
1282 } else {
1283 buf_len = data_len;
1284 }
1285
1286 addr[0] = secret;
1287 len[0] = secret_len;
1288 addr[1] = msg->hdr->authenticator;
1289 len[1] = 16;
1290 md5_vector(2, addr, len, hash);
1291
1292 for (i = 0; i < 16; i++)
1293 buf[i] ^= hash[i];
1294 pos = 16;
1295
1296 while (pos < buf_len) {
1297 addr[0] = secret;
1298 len[0] = secret_len;
1299 addr[1] = &buf[pos - 16];
1300 len[1] = 16;
1301 md5_vector(2, addr, len, hash);
1302
1303 for (i = 0; i < 16; i++)
1304 buf[pos + i] ^= hash[i];
1305
1306 pos += 16;
1307 }
1308
1309 return buf_len;
1310 }
1311
1312
1313 /* Add User-Password attribute to a RADIUS message and encrypt it as specified
1314 * in RFC 2865, Chap. 5.2 */
1315 struct radius_attr_hdr *
radius_msg_add_attr_user_password(struct radius_msg * msg,const u8 * data,size_t data_len,const u8 * secret,size_t secret_len)1316 radius_msg_add_attr_user_password(struct radius_msg *msg,
1317 const u8 *data, size_t data_len,
1318 const u8 *secret, size_t secret_len)
1319 {
1320 u8 buf[128];
1321 int res;
1322
1323 res = radius_user_password_hide(msg, data, data_len,
1324 secret, secret_len, buf, sizeof(buf));
1325 if (res < 0)
1326 return NULL;
1327
1328 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD,
1329 buf, res);
1330 }
1331
1332
radius_msg_get_attr(struct radius_msg * msg,u8 type,u8 * buf,size_t len)1333 int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len)
1334 {
1335 struct radius_attr_hdr *attr = NULL, *tmp;
1336 size_t i, dlen;
1337
1338 for (i = 0; i < msg->attr_used; i++) {
1339 tmp = radius_get_attr_hdr(msg, i);
1340 if (tmp->type == type) {
1341 attr = tmp;
1342 break;
1343 }
1344 }
1345
1346 if (!attr || attr->length < sizeof(*attr))
1347 return -1;
1348
1349 dlen = attr->length - sizeof(*attr);
1350 if (buf)
1351 os_memcpy(buf, (attr + 1), dlen > len ? len : dlen);
1352 return dlen;
1353 }
1354
1355
radius_msg_get_attr_ptr(struct radius_msg * msg,u8 type,u8 ** buf,size_t * len,const u8 * start)1356 int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf,
1357 size_t *len, const u8 *start)
1358 {
1359 size_t i;
1360 struct radius_attr_hdr *attr = NULL, *tmp;
1361
1362 for (i = 0; i < msg->attr_used; i++) {
1363 tmp = radius_get_attr_hdr(msg, i);
1364 if (tmp->type == type &&
1365 (start == NULL || (u8 *) tmp > start)) {
1366 attr = tmp;
1367 break;
1368 }
1369 }
1370
1371 if (!attr || attr->length < sizeof(*attr))
1372 return -1;
1373
1374 *buf = (u8 *) (attr + 1);
1375 *len = attr->length - sizeof(*attr);
1376 return 0;
1377 }
1378
1379
radius_msg_count_attr(struct radius_msg * msg,u8 type,int min_len)1380 int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len)
1381 {
1382 size_t i;
1383 int count;
1384
1385 for (count = 0, i = 0; i < msg->attr_used; i++) {
1386 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
1387 if (attr->type == type &&
1388 attr->length >= sizeof(struct radius_attr_hdr) + min_len)
1389 count++;
1390 }
1391
1392 return count;
1393 }
1394
1395
1396 struct radius_tunnel_attrs {
1397 int tag_used;
1398 int type; /* Tunnel-Type */
1399 int medium_type; /* Tunnel-Medium-Type */
1400 int vlanid;
1401 };
1402
1403
1404 /**
1405 * radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information
1406 * @msg: RADIUS message
1407 * Returns: VLAN ID for the first tunnel configuration of -1 if none is found
1408 */
radius_msg_get_vlanid(struct radius_msg * msg)1409 int radius_msg_get_vlanid(struct radius_msg *msg)
1410 {
1411 struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun;
1412 size_t i;
1413 struct radius_attr_hdr *attr = NULL;
1414 const u8 *data;
1415 char buf[10];
1416 size_t dlen;
1417
1418 os_memset(&tunnel, 0, sizeof(tunnel));
1419
1420 for (i = 0; i < msg->attr_used; i++) {
1421 attr = radius_get_attr_hdr(msg, i);
1422 if (attr->length < sizeof(*attr))
1423 return -1;
1424 data = (const u8 *) (attr + 1);
1425 dlen = attr->length - sizeof(*attr);
1426 if (attr->length < 3)
1427 continue;
1428 if (data[0] >= RADIUS_TUNNEL_TAGS)
1429 tun = &tunnel[0];
1430 else
1431 tun = &tunnel[data[0]];
1432
1433 switch (attr->type) {
1434 case RADIUS_ATTR_TUNNEL_TYPE:
1435 if (attr->length != 6)
1436 break;
1437 tun->tag_used++;
1438 tun->type = WPA_GET_BE24(data + 1);
1439 break;
1440 case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE:
1441 if (attr->length != 6)
1442 break;
1443 tun->tag_used++;
1444 tun->medium_type = WPA_GET_BE24(data + 1);
1445 break;
1446 case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID:
1447 if (data[0] < RADIUS_TUNNEL_TAGS) {
1448 data++;
1449 dlen--;
1450 }
1451 if (dlen >= sizeof(buf))
1452 break;
1453 os_memcpy(buf, data, dlen);
1454 buf[dlen] = '\0';
1455 tun->tag_used++;
1456 tun->vlanid = atoi(buf);
1457 break;
1458 }
1459 }
1460
1461 for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) {
1462 tun = &tunnel[i];
1463 if (tun->tag_used &&
1464 tun->type == RADIUS_TUNNEL_TYPE_VLAN &&
1465 tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 &&
1466 tun->vlanid > 0)
1467 return tun->vlanid;
1468 }
1469
1470 return -1;
1471 }
1472
1473
1474 /**
1475 * radius_msg_get_tunnel_password - Parse RADIUS attribute Tunnel-Password
1476 * @msg: Received RADIUS message
1477 * @keylen: Length of returned password
1478 * @secret: RADIUS shared secret
1479 * @secret_len: Length of secret
1480 * @sent_msg: Sent RADIUS message
1481 * @n: Number of password attribute to return (starting with 0)
1482 * Returns: Pointer to n-th password (free with os_free) or %NULL
1483 */
radius_msg_get_tunnel_password(struct radius_msg * msg,int * keylen,const u8 * secret,size_t secret_len,struct radius_msg * sent_msg,size_t n)1484 char * radius_msg_get_tunnel_password(struct radius_msg *msg, int *keylen,
1485 const u8 *secret, size_t secret_len,
1486 struct radius_msg *sent_msg, size_t n)
1487 {
1488 u8 *buf = NULL;
1489 size_t buflen;
1490 const u8 *salt;
1491 u8 *str;
1492 const u8 *addr[3];
1493 size_t len[3];
1494 u8 hash[16];
1495 u8 *pos;
1496 size_t i, j = 0;
1497 struct radius_attr_hdr *attr;
1498 const u8 *data;
1499 size_t dlen;
1500 const u8 *fdata = NULL; /* points to found item */
1501 size_t fdlen = -1;
1502 char *ret = NULL;
1503
1504 /* find n-th valid Tunnel-Password attribute */
1505 for (i = 0; i < msg->attr_used; i++) {
1506 attr = radius_get_attr_hdr(msg, i);
1507 if (attr == NULL ||
1508 attr->type != RADIUS_ATTR_TUNNEL_PASSWORD) {
1509 continue;
1510 }
1511 if (attr->length <= 5)
1512 continue;
1513 data = (const u8 *) (attr + 1);
1514 dlen = attr->length - sizeof(*attr);
1515 if (dlen <= 3 || dlen % 16 != 3)
1516 continue;
1517 j++;
1518 if (j <= n)
1519 continue;
1520
1521 fdata = data;
1522 fdlen = dlen;
1523 break;
1524 }
1525 if (fdata == NULL)
1526 goto out;
1527
1528 /* alloc writable memory for decryption */
1529 buf = os_malloc(fdlen);
1530 if (buf == NULL)
1531 goto out;
1532 os_memcpy(buf, fdata, fdlen);
1533 buflen = fdlen;
1534
1535 /* init pointers */
1536 salt = buf + 1;
1537 str = buf + 3;
1538
1539 /* decrypt blocks */
1540 pos = buf + buflen - 16; /* last block */
1541 while (pos >= str + 16) { /* all but the first block */
1542 addr[0] = secret;
1543 len[0] = secret_len;
1544 addr[1] = pos - 16;
1545 len[1] = 16;
1546 md5_vector(2, addr, len, hash);
1547
1548 for (i = 0; i < 16; i++)
1549 pos[i] ^= hash[i];
1550
1551 pos -= 16;
1552 }
1553
1554 /* decrypt first block */
1555 if (str != pos)
1556 goto out;
1557 addr[0] = secret;
1558 len[0] = secret_len;
1559 addr[1] = sent_msg->hdr->authenticator;
1560 len[1] = 16;
1561 addr[2] = salt;
1562 len[2] = 2;
1563 md5_vector(3, addr, len, hash);
1564
1565 for (i = 0; i < 16; i++)
1566 pos[i] ^= hash[i];
1567
1568 /* derive plaintext length from first subfield */
1569 *keylen = (unsigned char) str[0];
1570 if ((u8 *) (str + *keylen) >= (u8 *) (buf + buflen)) {
1571 /* decryption error - invalid key length */
1572 goto out;
1573 }
1574 if (*keylen == 0) {
1575 /* empty password */
1576 goto out;
1577 }
1578
1579 /* copy passphrase into new buffer */
1580 ret = os_malloc(*keylen);
1581 if (ret)
1582 os_memcpy(ret, str + 1, *keylen);
1583
1584 out:
1585 /* return new buffer */
1586 os_free(buf);
1587 return ret;
1588 }
1589
1590
radius_free_class(struct radius_class_data * c)1591 void radius_free_class(struct radius_class_data *c)
1592 {
1593 size_t i;
1594 if (c == NULL)
1595 return;
1596 for (i = 0; i < c->count; i++)
1597 os_free(c->attr[i].data);
1598 os_free(c->attr);
1599 c->attr = NULL;
1600 c->count = 0;
1601 }
1602
1603
radius_copy_class(struct radius_class_data * dst,const struct radius_class_data * src)1604 int radius_copy_class(struct radius_class_data *dst,
1605 const struct radius_class_data *src)
1606 {
1607 size_t i;
1608
1609 if (src->attr == NULL)
1610 return 0;
1611
1612 dst->attr = os_calloc(src->count, sizeof(struct radius_attr_data));
1613 if (dst->attr == NULL)
1614 return -1;
1615
1616 dst->count = 0;
1617
1618 for (i = 0; i < src->count; i++) {
1619 dst->attr[i].data = os_malloc(src->attr[i].len);
1620 if (dst->attr[i].data == NULL)
1621 break;
1622 dst->count++;
1623 os_memcpy(dst->attr[i].data, src->attr[i].data,
1624 src->attr[i].len);
1625 dst->attr[i].len = src->attr[i].len;
1626 }
1627
1628 return 0;
1629 }
1630
1631
radius_msg_find_unlisted_attr(struct radius_msg * msg,u8 * attrs)1632 u8 radius_msg_find_unlisted_attr(struct radius_msg *msg, u8 *attrs)
1633 {
1634 size_t i, j;
1635 struct radius_attr_hdr *attr;
1636
1637 for (i = 0; i < msg->attr_used; i++) {
1638 attr = radius_get_attr_hdr(msg, i);
1639
1640 for (j = 0; attrs[j]; j++) {
1641 if (attr->type == attrs[j])
1642 break;
1643 }
1644
1645 if (attrs[j] == 0)
1646 return attr->type; /* unlisted attr */
1647 }
1648
1649 return 0;
1650 }
1651