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 const 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_OPERATOR_NAME, "Operator-Name", RADIUS_ATTR_TEXT },
237 { RADIUS_ATTR_LOCATION_INFO, "Location-Information",
238 RADIUS_ATTR_HEXDUMP },
239 { RADIUS_ATTR_LOCATION_DATA, "Location-Data", RADIUS_ATTR_HEXDUMP },
240 { RADIUS_ATTR_BASIC_LOCATION_POLICY_RULES,
241 "Basic-Location-Policy-Rules", RADIUS_ATTR_HEXDUMP },
242 { RADIUS_ATTR_EXTENDED_LOCATION_POLICY_RULES,
243 "Extended-Location-Policy-Rules", RADIUS_ATTR_HEXDUMP },
244 { RADIUS_ATTR_LOCATION_CAPABLE, "Location-Capable", RADIUS_ATTR_INT32 },
245 { RADIUS_ATTR_REQUESTED_LOCATION_INFO, "Requested-Location-Info",
246 RADIUS_ATTR_INT32 },
247 { RADIUS_ATTR_MOBILITY_DOMAIN_ID, "Mobility-Domain-Id",
248 RADIUS_ATTR_INT32 },
249 { RADIUS_ATTR_WLAN_HESSID, "WLAN-HESSID", RADIUS_ATTR_TEXT },
250 { RADIUS_ATTR_WLAN_PAIRWISE_CIPHER, "WLAN-Pairwise-Cipher",
251 RADIUS_ATTR_HEXDUMP },
252 { RADIUS_ATTR_WLAN_GROUP_CIPHER, "WLAN-Group-Cipher",
253 RADIUS_ATTR_HEXDUMP },
254 { RADIUS_ATTR_WLAN_AKM_SUITE, "WLAN-AKM-Suite",
255 RADIUS_ATTR_HEXDUMP },
256 { RADIUS_ATTR_WLAN_GROUP_MGMT_CIPHER, "WLAN-Group-Mgmt-Pairwise-Cipher",
257 RADIUS_ATTR_HEXDUMP },
258 };
259 #define RADIUS_ATTRS ARRAY_SIZE(radius_attrs)
260
261
radius_get_attr_type(u8 type)262 static const struct radius_attr_type *radius_get_attr_type(u8 type)
263 {
264 size_t i;
265
266 for (i = 0; i < RADIUS_ATTRS; i++) {
267 if (type == radius_attrs[i].type)
268 return &radius_attrs[i];
269 }
270
271 return NULL;
272 }
273
274
radius_msg_dump_attr(struct radius_attr_hdr * hdr)275 static void radius_msg_dump_attr(struct radius_attr_hdr *hdr)
276 {
277 const struct radius_attr_type *attr;
278 int len;
279 unsigned char *pos;
280 char buf[1000];
281
282 attr = radius_get_attr_type(hdr->type);
283
284 wpa_printf(MSG_INFO, " Attribute %d (%s) length=%d",
285 hdr->type, attr ? attr->name : "?Unknown?", hdr->length);
286
287 if (attr == NULL || hdr->length < sizeof(struct radius_attr_hdr))
288 return;
289
290 len = hdr->length - sizeof(struct radius_attr_hdr);
291 pos = (unsigned char *) (hdr + 1);
292
293 switch (attr->data_type) {
294 case RADIUS_ATTR_TEXT:
295 printf_encode(buf, sizeof(buf), pos, len);
296 wpa_printf(MSG_INFO, " Value: '%s'", buf);
297 break;
298
299 case RADIUS_ATTR_IP:
300 if (len == 4) {
301 struct in_addr addr;
302 os_memcpy(&addr, pos, 4);
303 wpa_printf(MSG_INFO, " Value: %s",
304 inet_ntoa(addr));
305 } else {
306 wpa_printf(MSG_INFO, " Invalid IP address length %d",
307 len);
308 }
309 break;
310
311 #ifdef CONFIG_IPV6
312 case RADIUS_ATTR_IPV6:
313 if (len == 16) {
314 const char *atxt;
315 struct in6_addr *addr = (struct in6_addr *) pos;
316 atxt = inet_ntop(AF_INET6, addr, buf, sizeof(buf));
317 wpa_printf(MSG_INFO, " Value: %s",
318 atxt ? atxt : "?");
319 } else {
320 wpa_printf(MSG_INFO, " Invalid IPv6 address length %d",
321 len);
322 }
323 break;
324 #endif /* CONFIG_IPV6 */
325
326 case RADIUS_ATTR_HEXDUMP:
327 case RADIUS_ATTR_UNDIST:
328 wpa_snprintf_hex(buf, sizeof(buf), pos, len);
329 wpa_printf(MSG_INFO, " Value: %s", buf);
330 break;
331
332 case RADIUS_ATTR_INT32:
333 if (len == 4)
334 wpa_printf(MSG_INFO, " Value: %u",
335 WPA_GET_BE32(pos));
336 else
337 wpa_printf(MSG_INFO, " Invalid INT32 length %d",
338 len);
339 break;
340
341 default:
342 break;
343 }
344 }
345
346
radius_msg_dump(struct radius_msg * msg)347 void radius_msg_dump(struct radius_msg *msg)
348 {
349 size_t i;
350
351 wpa_printf(MSG_INFO, "RADIUS message: code=%d (%s) identifier=%d length=%d",
352 msg->hdr->code, radius_code_string(msg->hdr->code),
353 msg->hdr->identifier, be_to_host16(msg->hdr->length));
354
355 for (i = 0; i < msg->attr_used; i++) {
356 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
357 radius_msg_dump_attr(attr);
358 }
359 }
360
361
radius_msg_finish(struct radius_msg * msg,const u8 * secret,size_t secret_len)362 int radius_msg_finish(struct radius_msg *msg, const u8 *secret,
363 size_t secret_len)
364 {
365 if (secret) {
366 u8 auth[MD5_MAC_LEN];
367 struct radius_attr_hdr *attr;
368
369 os_memset(auth, 0, MD5_MAC_LEN);
370 attr = radius_msg_add_attr(msg,
371 RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
372 auth, MD5_MAC_LEN);
373 if (attr == NULL) {
374 wpa_printf(MSG_WARNING, "RADIUS: Could not add "
375 "Message-Authenticator");
376 return -1;
377 }
378 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
379 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
380 wpabuf_len(msg->buf), (u8 *) (attr + 1));
381 } else
382 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
383
384 if (wpabuf_len(msg->buf) > 0xffff) {
385 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
386 (unsigned long) wpabuf_len(msg->buf));
387 return -1;
388 }
389 return 0;
390 }
391
392
radius_msg_finish_srv(struct radius_msg * msg,const u8 * secret,size_t secret_len,const u8 * req_authenticator)393 int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret,
394 size_t secret_len, const u8 *req_authenticator)
395 {
396 u8 auth[MD5_MAC_LEN];
397 struct radius_attr_hdr *attr;
398 const u8 *addr[4];
399 size_t len[4];
400
401 os_memset(auth, 0, MD5_MAC_LEN);
402 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
403 auth, MD5_MAC_LEN);
404 if (attr == NULL) {
405 wpa_printf(MSG_ERROR, "WARNING: Could not add Message-Authenticator");
406 return -1;
407 }
408 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
409 os_memcpy(msg->hdr->authenticator, req_authenticator,
410 sizeof(msg->hdr->authenticator));
411 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
412 wpabuf_len(msg->buf), (u8 *) (attr + 1));
413
414 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
415 addr[0] = (u8 *) msg->hdr;
416 len[0] = 1 + 1 + 2;
417 addr[1] = req_authenticator;
418 len[1] = MD5_MAC_LEN;
419 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
420 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
421 addr[3] = secret;
422 len[3] = secret_len;
423 md5_vector(4, addr, len, msg->hdr->authenticator);
424
425 if (wpabuf_len(msg->buf) > 0xffff) {
426 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
427 (unsigned long) wpabuf_len(msg->buf));
428 return -1;
429 }
430 return 0;
431 }
432
433
radius_msg_finish_das_resp(struct radius_msg * msg,const u8 * secret,size_t secret_len,const struct radius_hdr * req_hdr)434 int radius_msg_finish_das_resp(struct radius_msg *msg, const u8 *secret,
435 size_t secret_len,
436 const struct radius_hdr *req_hdr)
437 {
438 const u8 *addr[2];
439 size_t len[2];
440 u8 auth[MD5_MAC_LEN];
441 struct radius_attr_hdr *attr;
442
443 os_memset(auth, 0, MD5_MAC_LEN);
444 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
445 auth, MD5_MAC_LEN);
446 if (attr == NULL) {
447 wpa_printf(MSG_WARNING, "Could not add Message-Authenticator");
448 return -1;
449 }
450
451 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
452 os_memcpy(msg->hdr->authenticator, req_hdr->authenticator, 16);
453 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
454 wpabuf_len(msg->buf), (u8 *) (attr + 1));
455
456 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
457 addr[0] = wpabuf_head_u8(msg->buf);
458 len[0] = wpabuf_len(msg->buf);
459 addr[1] = secret;
460 len[1] = secret_len;
461 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0)
462 return -1;
463
464 if (wpabuf_len(msg->buf) > 0xffff) {
465 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
466 (unsigned long) wpabuf_len(msg->buf));
467 return -1;
468 }
469 return 0;
470 }
471
472
radius_msg_finish_acct(struct radius_msg * msg,const u8 * secret,size_t secret_len)473 void radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret,
474 size_t secret_len)
475 {
476 const u8 *addr[2];
477 size_t len[2];
478
479 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
480 os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN);
481 addr[0] = wpabuf_head(msg->buf);
482 len[0] = wpabuf_len(msg->buf);
483 addr[1] = secret;
484 len[1] = secret_len;
485 md5_vector(2, addr, len, msg->hdr->authenticator);
486
487 if (wpabuf_len(msg->buf) > 0xffff) {
488 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
489 (unsigned long) wpabuf_len(msg->buf));
490 }
491 }
492
493
radius_msg_finish_acct_resp(struct radius_msg * msg,const u8 * secret,size_t secret_len,const u8 * req_authenticator)494 void radius_msg_finish_acct_resp(struct radius_msg *msg, const u8 *secret,
495 size_t secret_len, const u8 *req_authenticator)
496 {
497 const u8 *addr[2];
498 size_t len[2];
499
500 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
501 os_memcpy(msg->hdr->authenticator, req_authenticator, MD5_MAC_LEN);
502 addr[0] = wpabuf_head(msg->buf);
503 len[0] = wpabuf_len(msg->buf);
504 addr[1] = secret;
505 len[1] = secret_len;
506 md5_vector(2, addr, len, msg->hdr->authenticator);
507
508 if (wpabuf_len(msg->buf) > 0xffff) {
509 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
510 (unsigned long) wpabuf_len(msg->buf));
511 }
512 }
513
514
radius_msg_verify_acct_req(struct radius_msg * msg,const u8 * secret,size_t secret_len)515 int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret,
516 size_t secret_len)
517 {
518 const u8 *addr[4];
519 size_t len[4];
520 u8 zero[MD5_MAC_LEN];
521 u8 hash[MD5_MAC_LEN];
522
523 os_memset(zero, 0, sizeof(zero));
524 addr[0] = (u8 *) msg->hdr;
525 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
526 addr[1] = zero;
527 len[1] = MD5_MAC_LEN;
528 addr[2] = (u8 *) (msg->hdr + 1);
529 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
530 addr[3] = secret;
531 len[3] = secret_len;
532 md5_vector(4, addr, len, hash);
533 return os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0;
534 }
535
536
radius_msg_verify_das_req(struct radius_msg * msg,const u8 * secret,size_t secret_len)537 int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret,
538 size_t secret_len)
539 {
540 const u8 *addr[4];
541 size_t len[4];
542 u8 zero[MD5_MAC_LEN];
543 u8 hash[MD5_MAC_LEN];
544 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
545 u8 orig_authenticator[16];
546
547 struct radius_attr_hdr *attr = NULL, *tmp;
548 size_t i;
549
550 os_memset(zero, 0, sizeof(zero));
551 addr[0] = (u8 *) msg->hdr;
552 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
553 addr[1] = zero;
554 len[1] = MD5_MAC_LEN;
555 addr[2] = (u8 *) (msg->hdr + 1);
556 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
557 addr[3] = secret;
558 len[3] = secret_len;
559 md5_vector(4, addr, len, hash);
560 if (os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0)
561 return 1;
562
563 for (i = 0; i < msg->attr_used; i++) {
564 tmp = radius_get_attr_hdr(msg, i);
565 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
566 if (attr != NULL) {
567 wpa_printf(MSG_WARNING, "Multiple "
568 "Message-Authenticator attributes "
569 "in RADIUS message");
570 return 1;
571 }
572 attr = tmp;
573 }
574 }
575
576 if (attr == NULL) {
577 /* Message-Authenticator is MAY; not required */
578 return 0;
579 }
580
581 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
582 os_memset(attr + 1, 0, MD5_MAC_LEN);
583 os_memcpy(orig_authenticator, msg->hdr->authenticator,
584 sizeof(orig_authenticator));
585 os_memset(msg->hdr->authenticator, 0,
586 sizeof(msg->hdr->authenticator));
587 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
588 wpabuf_len(msg->buf), auth);
589 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
590 os_memcpy(msg->hdr->authenticator, orig_authenticator,
591 sizeof(orig_authenticator));
592
593 return os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0;
594 }
595
596
radius_msg_add_attr_to_array(struct radius_msg * msg,struct radius_attr_hdr * attr)597 static int radius_msg_add_attr_to_array(struct radius_msg *msg,
598 struct radius_attr_hdr *attr)
599 {
600 if (msg->attr_used >= msg->attr_size) {
601 size_t *nattr_pos;
602 int nlen = msg->attr_size * 2;
603
604 nattr_pos = os_realloc_array(msg->attr_pos, nlen,
605 sizeof(*msg->attr_pos));
606 if (nattr_pos == NULL)
607 return -1;
608
609 msg->attr_pos = nattr_pos;
610 msg->attr_size = nlen;
611 }
612
613 msg->attr_pos[msg->attr_used++] =
614 (unsigned char *) attr - wpabuf_head_u8(msg->buf);
615
616 return 0;
617 }
618
619
radius_msg_add_attr(struct radius_msg * msg,u8 type,const u8 * data,size_t data_len)620 struct radius_attr_hdr *radius_msg_add_attr(struct radius_msg *msg, u8 type,
621 const u8 *data, size_t data_len)
622 {
623 size_t buf_needed;
624 struct radius_attr_hdr *attr;
625
626 if (data_len > RADIUS_MAX_ATTR_LEN) {
627 wpa_printf(MSG_ERROR, "radius_msg_add_attr: too long attribute (%lu bytes)",
628 (unsigned long) data_len);
629 return NULL;
630 }
631
632 buf_needed = sizeof(*attr) + data_len;
633
634 if (wpabuf_tailroom(msg->buf) < buf_needed) {
635 /* allocate more space for message buffer */
636 if (wpabuf_resize(&msg->buf, buf_needed) < 0)
637 return NULL;
638 msg->hdr = wpabuf_mhead(msg->buf);
639 }
640
641 attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr));
642 attr->type = type;
643 attr->length = sizeof(*attr) + data_len;
644 wpabuf_put_data(msg->buf, data, data_len);
645
646 if (radius_msg_add_attr_to_array(msg, attr))
647 return NULL;
648
649 return attr;
650 }
651
652
653 /**
654 * radius_msg_parse - Parse a RADIUS message
655 * @data: RADIUS message to be parsed
656 * @len: Length of data buffer in octets
657 * Returns: Parsed RADIUS message or %NULL on failure
658 *
659 * This parses a RADIUS message and makes a copy of its data. The caller is
660 * responsible for freeing the returned data with radius_msg_free().
661 */
radius_msg_parse(const u8 * data,size_t len)662 struct radius_msg * radius_msg_parse(const u8 *data, size_t len)
663 {
664 struct radius_msg *msg;
665 struct radius_hdr *hdr;
666 struct radius_attr_hdr *attr;
667 size_t msg_len;
668 unsigned char *pos, *end;
669
670 if (data == NULL || len < sizeof(*hdr))
671 return NULL;
672
673 hdr = (struct radius_hdr *) data;
674
675 msg_len = be_to_host16(hdr->length);
676 if (msg_len < sizeof(*hdr) || msg_len > len) {
677 wpa_printf(MSG_INFO, "RADIUS: Invalid message length");
678 return NULL;
679 }
680
681 if (msg_len < len) {
682 wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after "
683 "RADIUS message", (unsigned long) len - msg_len);
684 }
685
686 msg = os_zalloc(sizeof(*msg));
687 if (msg == NULL)
688 return NULL;
689
690 msg->buf = wpabuf_alloc_copy(data, msg_len);
691 if (msg->buf == NULL || radius_msg_initialize(msg)) {
692 radius_msg_free(msg);
693 return NULL;
694 }
695 msg->hdr = wpabuf_mhead(msg->buf);
696
697 /* parse attributes */
698 pos = wpabuf_mhead_u8(msg->buf) + sizeof(struct radius_hdr);
699 end = wpabuf_mhead_u8(msg->buf) + wpabuf_len(msg->buf);
700 while (pos < end) {
701 if ((size_t) (end - pos) < sizeof(*attr))
702 goto fail;
703
704 attr = (struct radius_attr_hdr *) pos;
705
706 if (pos + attr->length > end || attr->length < sizeof(*attr))
707 goto fail;
708
709 /* TODO: check that attr->length is suitable for attr->type */
710
711 if (radius_msg_add_attr_to_array(msg, attr))
712 goto fail;
713
714 pos += attr->length;
715 }
716
717 return msg;
718
719 fail:
720 radius_msg_free(msg);
721 return NULL;
722 }
723
724
radius_msg_add_eap(struct radius_msg * msg,const u8 * data,size_t data_len)725 int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len)
726 {
727 const u8 *pos = data;
728 size_t left = data_len;
729
730 while (left > 0) {
731 int len;
732 if (left > RADIUS_MAX_ATTR_LEN)
733 len = RADIUS_MAX_ATTR_LEN;
734 else
735 len = left;
736
737 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE,
738 pos, len))
739 return 0;
740
741 pos += len;
742 left -= len;
743 }
744
745 return 1;
746 }
747
748
radius_msg_get_eap(struct radius_msg * msg)749 struct wpabuf * radius_msg_get_eap(struct radius_msg *msg)
750 {
751 struct wpabuf *eap;
752 size_t len, i;
753 struct radius_attr_hdr *attr;
754
755 if (msg == NULL)
756 return NULL;
757
758 len = 0;
759 for (i = 0; i < msg->attr_used; i++) {
760 attr = radius_get_attr_hdr(msg, i);
761 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
762 attr->length > sizeof(struct radius_attr_hdr))
763 len += attr->length - sizeof(struct radius_attr_hdr);
764 }
765
766 if (len == 0)
767 return NULL;
768
769 eap = wpabuf_alloc(len);
770 if (eap == NULL)
771 return NULL;
772
773 for (i = 0; i < msg->attr_used; i++) {
774 attr = radius_get_attr_hdr(msg, i);
775 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
776 attr->length > sizeof(struct radius_attr_hdr)) {
777 int flen = attr->length - sizeof(*attr);
778 wpabuf_put_data(eap, attr + 1, flen);
779 }
780 }
781
782 return eap;
783 }
784
785
radius_msg_verify_msg_auth(struct radius_msg * msg,const u8 * secret,size_t secret_len,const u8 * req_auth)786 int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret,
787 size_t secret_len, const u8 *req_auth)
788 {
789 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
790 u8 orig_authenticator[16];
791 struct radius_attr_hdr *attr = NULL, *tmp;
792 size_t i;
793
794 for (i = 0; i < msg->attr_used; i++) {
795 tmp = radius_get_attr_hdr(msg, i);
796 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
797 if (attr != NULL) {
798 wpa_printf(MSG_INFO, "Multiple Message-Authenticator attributes in RADIUS message");
799 return 1;
800 }
801 attr = tmp;
802 }
803 }
804
805 if (attr == NULL) {
806 wpa_printf(MSG_INFO, "No Message-Authenticator attribute found");
807 return 1;
808 }
809
810 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
811 os_memset(attr + 1, 0, MD5_MAC_LEN);
812 if (req_auth) {
813 os_memcpy(orig_authenticator, msg->hdr->authenticator,
814 sizeof(orig_authenticator));
815 os_memcpy(msg->hdr->authenticator, req_auth,
816 sizeof(msg->hdr->authenticator));
817 }
818 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
819 wpabuf_len(msg->buf), auth);
820 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
821 if (req_auth) {
822 os_memcpy(msg->hdr->authenticator, orig_authenticator,
823 sizeof(orig_authenticator));
824 }
825
826 if (os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0) {
827 wpa_printf(MSG_INFO, "Invalid Message-Authenticator!");
828 return 1;
829 }
830
831 return 0;
832 }
833
834
radius_msg_verify(struct radius_msg * msg,const u8 * secret,size_t secret_len,struct radius_msg * sent_msg,int auth)835 int radius_msg_verify(struct radius_msg *msg, const u8 *secret,
836 size_t secret_len, struct radius_msg *sent_msg, int auth)
837 {
838 const u8 *addr[4];
839 size_t len[4];
840 u8 hash[MD5_MAC_LEN];
841
842 if (sent_msg == NULL) {
843 wpa_printf(MSG_INFO, "No matching Access-Request message found");
844 return 1;
845 }
846
847 if (auth &&
848 radius_msg_verify_msg_auth(msg, secret, secret_len,
849 sent_msg->hdr->authenticator)) {
850 return 1;
851 }
852
853 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
854 addr[0] = (u8 *) msg->hdr;
855 len[0] = 1 + 1 + 2;
856 addr[1] = sent_msg->hdr->authenticator;
857 len[1] = MD5_MAC_LEN;
858 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
859 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
860 addr[3] = secret;
861 len[3] = secret_len;
862 md5_vector(4, addr, len, hash);
863 if (os_memcmp_const(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) {
864 wpa_printf(MSG_INFO, "Response Authenticator invalid!");
865 return 1;
866 }
867
868 return 0;
869 }
870
871
radius_msg_copy_attr(struct radius_msg * dst,struct radius_msg * src,u8 type)872 int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src,
873 u8 type)
874 {
875 struct radius_attr_hdr *attr;
876 size_t i;
877 int count = 0;
878
879 for (i = 0; i < src->attr_used; i++) {
880 attr = radius_get_attr_hdr(src, i);
881 if (attr->type == type && attr->length >= sizeof(*attr)) {
882 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1),
883 attr->length - sizeof(*attr)))
884 return -1;
885 count++;
886 }
887 }
888
889 return count;
890 }
891
892
893 /* Create Request Authenticator. The value should be unique over the lifetime
894 * of the shared secret between authenticator and authentication server.
895 * Use one-way MD5 hash calculated from current timestamp and some data given
896 * by the caller. */
radius_msg_make_authenticator(struct radius_msg * msg,const u8 * data,size_t len)897 void radius_msg_make_authenticator(struct radius_msg *msg,
898 const u8 *data, size_t len)
899 {
900 struct os_time tv;
901 long int l;
902 const u8 *addr[3];
903 size_t elen[3];
904
905 os_get_time(&tv);
906 l = os_random();
907 addr[0] = (u8 *) &tv;
908 elen[0] = sizeof(tv);
909 addr[1] = data;
910 elen[1] = len;
911 addr[2] = (u8 *) &l;
912 elen[2] = sizeof(l);
913 md5_vector(3, addr, elen, msg->hdr->authenticator);
914 }
915
916
917 /* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message.
918 * Returns the Attribute payload and sets alen to indicate the length of the
919 * payload if a vendor attribute with subtype is found, otherwise returns NULL.
920 * The returned payload is allocated with os_malloc() and caller must free it
921 * by calling os_free().
922 */
radius_msg_get_vendor_attr(struct radius_msg * msg,u32 vendor,u8 subtype,size_t * alen)923 static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor,
924 u8 subtype, size_t *alen)
925 {
926 u8 *data, *pos;
927 size_t i, len;
928
929 if (msg == NULL)
930 return NULL;
931
932 for (i = 0; i < msg->attr_used; i++) {
933 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
934 size_t left;
935 u32 vendor_id;
936 struct radius_attr_vendor *vhdr;
937
938 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC ||
939 attr->length < sizeof(*attr))
940 continue;
941
942 left = attr->length - sizeof(*attr);
943 if (left < 4)
944 continue;
945
946 pos = (u8 *) (attr + 1);
947
948 os_memcpy(&vendor_id, pos, 4);
949 pos += 4;
950 left -= 4;
951
952 if (ntohl(vendor_id) != vendor)
953 continue;
954
955 while (left >= sizeof(*vhdr)) {
956 vhdr = (struct radius_attr_vendor *) pos;
957 if (vhdr->vendor_length > left ||
958 vhdr->vendor_length < sizeof(*vhdr)) {
959 break;
960 }
961 if (vhdr->vendor_type != subtype) {
962 pos += vhdr->vendor_length;
963 left -= vhdr->vendor_length;
964 continue;
965 }
966
967 len = vhdr->vendor_length - sizeof(*vhdr);
968 data = os_malloc(len);
969 if (data == NULL)
970 return NULL;
971 os_memcpy(data, pos + sizeof(*vhdr), len);
972 if (alen)
973 *alen = len;
974 return data;
975 }
976 }
977
978 return NULL;
979 }
980
981
decrypt_ms_key(const u8 * key,size_t len,const u8 * req_authenticator,const u8 * secret,size_t secret_len,size_t * reslen)982 static u8 * decrypt_ms_key(const u8 *key, size_t len,
983 const u8 *req_authenticator,
984 const u8 *secret, size_t secret_len, size_t *reslen)
985 {
986 u8 *plain, *ppos, *res;
987 const u8 *pos;
988 size_t left, plen;
989 u8 hash[MD5_MAC_LEN];
990 int i, first = 1;
991 const u8 *addr[3];
992 size_t elen[3];
993
994 /* key: 16-bit salt followed by encrypted key info */
995
996 if (len < 2 + 16) {
997 wpa_printf(MSG_DEBUG, "RADIUS: %s: Len is too small: %d",
998 __func__, (int) len);
999 return NULL;
1000 }
1001
1002 pos = key + 2;
1003 left = len - 2;
1004 if (left % 16) {
1005 wpa_printf(MSG_INFO, "RADIUS: Invalid ms key len %lu",
1006 (unsigned long) left);
1007 return NULL;
1008 }
1009
1010 plen = left;
1011 ppos = plain = os_malloc(plen);
1012 if (plain == NULL)
1013 return NULL;
1014 plain[0] = 0;
1015
1016 while (left > 0) {
1017 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1018 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1019
1020 addr[0] = secret;
1021 elen[0] = secret_len;
1022 if (first) {
1023 addr[1] = req_authenticator;
1024 elen[1] = MD5_MAC_LEN;
1025 addr[2] = key;
1026 elen[2] = 2; /* Salt */
1027 } else {
1028 addr[1] = pos - MD5_MAC_LEN;
1029 elen[1] = MD5_MAC_LEN;
1030 }
1031 md5_vector(first ? 3 : 2, addr, elen, hash);
1032 first = 0;
1033
1034 for (i = 0; i < MD5_MAC_LEN; i++)
1035 *ppos++ = *pos++ ^ hash[i];
1036 left -= MD5_MAC_LEN;
1037 }
1038
1039 if (plain[0] == 0 || plain[0] > plen - 1) {
1040 wpa_printf(MSG_INFO, "RADIUS: Failed to decrypt MPPE key");
1041 os_free(plain);
1042 return NULL;
1043 }
1044
1045 res = os_malloc(plain[0]);
1046 if (res == NULL) {
1047 os_free(plain);
1048 return NULL;
1049 }
1050 os_memcpy(res, plain + 1, plain[0]);
1051 if (reslen)
1052 *reslen = plain[0];
1053 os_free(plain);
1054 return res;
1055 }
1056
1057
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)1058 static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt,
1059 const u8 *req_authenticator,
1060 const u8 *secret, size_t secret_len,
1061 u8 *ebuf, size_t *elen)
1062 {
1063 int i, len, first = 1;
1064 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos;
1065 const u8 *addr[3];
1066 size_t _len[3];
1067
1068 WPA_PUT_BE16(saltbuf, salt);
1069
1070 len = 1 + key_len;
1071 if (len & 0x0f) {
1072 len = (len & 0xf0) + 16;
1073 }
1074 os_memset(ebuf, 0, len);
1075 ebuf[0] = key_len;
1076 os_memcpy(ebuf + 1, key, key_len);
1077
1078 *elen = len;
1079
1080 pos = ebuf;
1081 while (len > 0) {
1082 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1083 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1084 addr[0] = secret;
1085 _len[0] = secret_len;
1086 if (first) {
1087 addr[1] = req_authenticator;
1088 _len[1] = MD5_MAC_LEN;
1089 addr[2] = saltbuf;
1090 _len[2] = sizeof(saltbuf);
1091 } else {
1092 addr[1] = pos - MD5_MAC_LEN;
1093 _len[1] = MD5_MAC_LEN;
1094 }
1095 md5_vector(first ? 3 : 2, addr, _len, hash);
1096 first = 0;
1097
1098 for (i = 0; i < MD5_MAC_LEN; i++)
1099 *pos++ ^= hash[i];
1100
1101 len -= MD5_MAC_LEN;
1102 }
1103 }
1104
1105
1106 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)1107 radius_msg_get_ms_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_MICROSOFT,
1122 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY,
1123 &keylen);
1124 if (key) {
1125 keys->send = decrypt_ms_key(key, keylen,
1126 sent_msg->hdr->authenticator,
1127 secret, secret_len,
1128 &keys->send_len);
1129 if (!keys->send) {
1130 wpa_printf(MSG_DEBUG,
1131 "RADIUS: Failed to decrypt send key");
1132 }
1133 os_free(key);
1134 }
1135
1136 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1137 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY,
1138 &keylen);
1139 if (key) {
1140 keys->recv = decrypt_ms_key(key, keylen,
1141 sent_msg->hdr->authenticator,
1142 secret, secret_len,
1143 &keys->recv_len);
1144 if (!keys->recv) {
1145 wpa_printf(MSG_DEBUG,
1146 "RADIUS: Failed to decrypt recv key");
1147 }
1148 os_free(key);
1149 }
1150
1151 return keys;
1152 }
1153
1154
1155 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)1156 radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
1157 const u8 *secret, size_t secret_len)
1158 {
1159 u8 *key;
1160 size_t keylen;
1161 struct radius_ms_mppe_keys *keys;
1162
1163 if (msg == NULL || sent_msg == NULL)
1164 return NULL;
1165
1166 keys = os_zalloc(sizeof(*keys));
1167 if (keys == NULL)
1168 return NULL;
1169
1170 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO,
1171 RADIUS_CISCO_AV_PAIR, &keylen);
1172 if (key && keylen == 51 &&
1173 os_memcmp(key, "leap:session-key=", 17) == 0) {
1174 keys->recv = decrypt_ms_key(key + 17, keylen - 17,
1175 sent_msg->hdr->authenticator,
1176 secret, secret_len,
1177 &keys->recv_len);
1178 }
1179 os_free(key);
1180
1181 return keys;
1182 }
1183
1184
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)1185 int radius_msg_add_mppe_keys(struct radius_msg *msg,
1186 const u8 *req_authenticator,
1187 const u8 *secret, size_t secret_len,
1188 const u8 *send_key, size_t send_key_len,
1189 const u8 *recv_key, size_t recv_key_len)
1190 {
1191 struct radius_attr_hdr *attr;
1192 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT);
1193 u8 *buf;
1194 struct radius_attr_vendor *vhdr;
1195 u8 *pos;
1196 size_t elen;
1197 int hlen;
1198 u16 salt;
1199
1200 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2;
1201
1202 /* MS-MPPE-Send-Key */
1203 buf = os_malloc(hlen + send_key_len + 16);
1204 if (buf == NULL) {
1205 return 0;
1206 }
1207 pos = buf;
1208 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1209 pos += sizeof(vendor_id);
1210 vhdr = (struct radius_attr_vendor *) pos;
1211 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY;
1212 pos = (u8 *) (vhdr + 1);
1213 salt = os_random() | 0x8000;
1214 WPA_PUT_BE16(pos, salt);
1215 pos += 2;
1216 encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret,
1217 secret_len, pos, &elen);
1218 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1219
1220 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1221 buf, hlen + elen);
1222 os_free(buf);
1223 if (attr == NULL) {
1224 return 0;
1225 }
1226
1227 /* MS-MPPE-Recv-Key */
1228 buf = os_malloc(hlen + recv_key_len + 16);
1229 if (buf == NULL) {
1230 return 0;
1231 }
1232 pos = buf;
1233 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1234 pos += sizeof(vendor_id);
1235 vhdr = (struct radius_attr_vendor *) pos;
1236 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY;
1237 pos = (u8 *) (vhdr + 1);
1238 salt ^= 1;
1239 WPA_PUT_BE16(pos, salt);
1240 pos += 2;
1241 encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret,
1242 secret_len, pos, &elen);
1243 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1244
1245 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1246 buf, hlen + elen);
1247 os_free(buf);
1248 if (attr == NULL) {
1249 return 0;
1250 }
1251
1252 return 1;
1253 }
1254
1255
radius_msg_add_wfa(struct radius_msg * msg,u8 subtype,const u8 * data,size_t len)1256 int radius_msg_add_wfa(struct radius_msg *msg, u8 subtype, const u8 *data,
1257 size_t len)
1258 {
1259 struct radius_attr_hdr *attr;
1260 u8 *buf, *pos;
1261 size_t alen;
1262
1263 alen = 4 + 2 + len;
1264 buf = os_malloc(alen);
1265 if (buf == NULL)
1266 return 0;
1267 pos = buf;
1268 WPA_PUT_BE32(pos, RADIUS_VENDOR_ID_WFA);
1269 pos += 4;
1270 *pos++ = subtype;
1271 *pos++ = 2 + len;
1272 os_memcpy(pos, data, len);
1273 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1274 buf, alen);
1275 os_free(buf);
1276 if (attr == NULL)
1277 return 0;
1278
1279 return 1;
1280 }
1281
1282
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)1283 int radius_user_password_hide(struct radius_msg *msg,
1284 const u8 *data, size_t data_len,
1285 const u8 *secret, size_t secret_len,
1286 u8 *buf, size_t buf_len)
1287 {
1288 size_t padlen, i, pos;
1289 const u8 *addr[2];
1290 size_t len[2];
1291 u8 hash[16];
1292
1293 if (data_len + 16 > buf_len)
1294 return -1;
1295
1296 os_memcpy(buf, data, data_len);
1297
1298 padlen = data_len % 16;
1299 if (padlen && data_len < buf_len) {
1300 padlen = 16 - padlen;
1301 os_memset(buf + data_len, 0, padlen);
1302 buf_len = data_len + padlen;
1303 } else {
1304 buf_len = data_len;
1305 }
1306
1307 addr[0] = secret;
1308 len[0] = secret_len;
1309 addr[1] = msg->hdr->authenticator;
1310 len[1] = 16;
1311 md5_vector(2, addr, len, hash);
1312
1313 for (i = 0; i < 16; i++)
1314 buf[i] ^= hash[i];
1315 pos = 16;
1316
1317 while (pos < buf_len) {
1318 addr[0] = secret;
1319 len[0] = secret_len;
1320 addr[1] = &buf[pos - 16];
1321 len[1] = 16;
1322 md5_vector(2, addr, len, hash);
1323
1324 for (i = 0; i < 16; i++)
1325 buf[pos + i] ^= hash[i];
1326
1327 pos += 16;
1328 }
1329
1330 return buf_len;
1331 }
1332
1333
1334 /* Add User-Password attribute to a RADIUS message and encrypt it as specified
1335 * in RFC 2865, Chap. 5.2 */
1336 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)1337 radius_msg_add_attr_user_password(struct radius_msg *msg,
1338 const u8 *data, size_t data_len,
1339 const u8 *secret, size_t secret_len)
1340 {
1341 u8 buf[128];
1342 int res;
1343
1344 res = radius_user_password_hide(msg, data, data_len,
1345 secret, secret_len, buf, sizeof(buf));
1346 if (res < 0)
1347 return NULL;
1348
1349 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD,
1350 buf, res);
1351 }
1352
1353
radius_msg_get_attr(struct radius_msg * msg,u8 type,u8 * buf,size_t len)1354 int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len)
1355 {
1356 struct radius_attr_hdr *attr = NULL, *tmp;
1357 size_t i, dlen;
1358
1359 for (i = 0; i < msg->attr_used; i++) {
1360 tmp = radius_get_attr_hdr(msg, i);
1361 if (tmp->type == type) {
1362 attr = tmp;
1363 break;
1364 }
1365 }
1366
1367 if (!attr || attr->length < sizeof(*attr))
1368 return -1;
1369
1370 dlen = attr->length - sizeof(*attr);
1371 if (buf)
1372 os_memcpy(buf, (attr + 1), dlen > len ? len : dlen);
1373 return dlen;
1374 }
1375
1376
radius_msg_get_attr_ptr(struct radius_msg * msg,u8 type,u8 ** buf,size_t * len,const u8 * start)1377 int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf,
1378 size_t *len, const u8 *start)
1379 {
1380 size_t i;
1381 struct radius_attr_hdr *attr = NULL, *tmp;
1382
1383 for (i = 0; i < msg->attr_used; i++) {
1384 tmp = radius_get_attr_hdr(msg, i);
1385 if (tmp->type == type &&
1386 (start == NULL || (u8 *) tmp > start)) {
1387 attr = tmp;
1388 break;
1389 }
1390 }
1391
1392 if (!attr || attr->length < sizeof(*attr))
1393 return -1;
1394
1395 *buf = (u8 *) (attr + 1);
1396 *len = attr->length - sizeof(*attr);
1397 return 0;
1398 }
1399
1400
radius_msg_count_attr(struct radius_msg * msg,u8 type,int min_len)1401 int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len)
1402 {
1403 size_t i;
1404 int count;
1405
1406 for (count = 0, i = 0; i < msg->attr_used; i++) {
1407 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
1408 if (attr->type == type &&
1409 attr->length >= sizeof(struct radius_attr_hdr) + min_len)
1410 count++;
1411 }
1412
1413 return count;
1414 }
1415
1416
1417 struct radius_tunnel_attrs {
1418 int tag_used;
1419 int type; /* Tunnel-Type */
1420 int medium_type; /* Tunnel-Medium-Type */
1421 int vlanid;
1422 };
1423
1424
1425 /**
1426 * radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information
1427 * @msg: RADIUS message
1428 * Returns: VLAN ID for the first tunnel configuration or 0 if none is found
1429 */
radius_msg_get_vlanid(struct radius_msg * msg)1430 int radius_msg_get_vlanid(struct radius_msg *msg)
1431 {
1432 struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun;
1433 size_t i;
1434 struct radius_attr_hdr *attr = NULL;
1435 const u8 *data;
1436 char buf[10];
1437 size_t dlen;
1438
1439 os_memset(&tunnel, 0, sizeof(tunnel));
1440
1441 for (i = 0; i < msg->attr_used; i++) {
1442 attr = radius_get_attr_hdr(msg, i);
1443 if (attr->length < sizeof(*attr))
1444 return -1;
1445 data = (const u8 *) (attr + 1);
1446 dlen = attr->length - sizeof(*attr);
1447 if (attr->length < 3)
1448 continue;
1449 if (data[0] >= RADIUS_TUNNEL_TAGS)
1450 tun = &tunnel[0];
1451 else
1452 tun = &tunnel[data[0]];
1453
1454 switch (attr->type) {
1455 case RADIUS_ATTR_TUNNEL_TYPE:
1456 if (attr->length != 6)
1457 break;
1458 tun->tag_used++;
1459 tun->type = WPA_GET_BE24(data + 1);
1460 break;
1461 case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE:
1462 if (attr->length != 6)
1463 break;
1464 tun->tag_used++;
1465 tun->medium_type = WPA_GET_BE24(data + 1);
1466 break;
1467 case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID:
1468 if (data[0] < RADIUS_TUNNEL_TAGS) {
1469 data++;
1470 dlen--;
1471 }
1472 if (dlen >= sizeof(buf))
1473 break;
1474 os_memcpy(buf, data, dlen);
1475 buf[dlen] = '\0';
1476 tun->tag_used++;
1477 tun->vlanid = atoi(buf);
1478 break;
1479 }
1480 }
1481
1482 for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) {
1483 tun = &tunnel[i];
1484 if (tun->tag_used &&
1485 tun->type == RADIUS_TUNNEL_TYPE_VLAN &&
1486 tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 &&
1487 tun->vlanid > 0)
1488 return tun->vlanid;
1489 }
1490
1491 return 0;
1492 }
1493
1494
1495 /**
1496 * radius_msg_get_tunnel_password - Parse RADIUS attribute Tunnel-Password
1497 * @msg: Received RADIUS message
1498 * @keylen: Length of returned password
1499 * @secret: RADIUS shared secret
1500 * @secret_len: Length of secret
1501 * @sent_msg: Sent RADIUS message
1502 * @n: Number of password attribute to return (starting with 0)
1503 * Returns: Pointer to n-th password (free with os_free) or %NULL
1504 */
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)1505 char * radius_msg_get_tunnel_password(struct radius_msg *msg, int *keylen,
1506 const u8 *secret, size_t secret_len,
1507 struct radius_msg *sent_msg, size_t n)
1508 {
1509 u8 *buf = NULL;
1510 size_t buflen;
1511 const u8 *salt;
1512 u8 *str;
1513 const u8 *addr[3];
1514 size_t len[3];
1515 u8 hash[16];
1516 u8 *pos;
1517 size_t i, j = 0;
1518 struct radius_attr_hdr *attr;
1519 const u8 *data;
1520 size_t dlen;
1521 const u8 *fdata = NULL; /* points to found item */
1522 size_t fdlen = -1;
1523 char *ret = NULL;
1524
1525 /* find n-th valid Tunnel-Password attribute */
1526 for (i = 0; i < msg->attr_used; i++) {
1527 attr = radius_get_attr_hdr(msg, i);
1528 if (attr == NULL ||
1529 attr->type != RADIUS_ATTR_TUNNEL_PASSWORD) {
1530 continue;
1531 }
1532 if (attr->length <= 5)
1533 continue;
1534 data = (const u8 *) (attr + 1);
1535 dlen = attr->length - sizeof(*attr);
1536 if (dlen <= 3 || dlen % 16 != 3)
1537 continue;
1538 j++;
1539 if (j <= n)
1540 continue;
1541
1542 fdata = data;
1543 fdlen = dlen;
1544 break;
1545 }
1546 if (fdata == NULL)
1547 goto out;
1548
1549 /* alloc writable memory for decryption */
1550 buf = os_malloc(fdlen);
1551 if (buf == NULL)
1552 goto out;
1553 os_memcpy(buf, fdata, fdlen);
1554 buflen = fdlen;
1555
1556 /* init pointers */
1557 salt = buf + 1;
1558 str = buf + 3;
1559
1560 /* decrypt blocks */
1561 pos = buf + buflen - 16; /* last block */
1562 while (pos >= str + 16) { /* all but the first block */
1563 addr[0] = secret;
1564 len[0] = secret_len;
1565 addr[1] = pos - 16;
1566 len[1] = 16;
1567 md5_vector(2, addr, len, hash);
1568
1569 for (i = 0; i < 16; i++)
1570 pos[i] ^= hash[i];
1571
1572 pos -= 16;
1573 }
1574
1575 /* decrypt first block */
1576 if (str != pos)
1577 goto out;
1578 addr[0] = secret;
1579 len[0] = secret_len;
1580 addr[1] = sent_msg->hdr->authenticator;
1581 len[1] = 16;
1582 addr[2] = salt;
1583 len[2] = 2;
1584 md5_vector(3, addr, len, hash);
1585
1586 for (i = 0; i < 16; i++)
1587 pos[i] ^= hash[i];
1588
1589 /* derive plaintext length from first subfield */
1590 *keylen = (unsigned char) str[0];
1591 if ((u8 *) (str + *keylen) >= (u8 *) (buf + buflen)) {
1592 /* decryption error - invalid key length */
1593 goto out;
1594 }
1595 if (*keylen == 0) {
1596 /* empty password */
1597 goto out;
1598 }
1599
1600 /* copy passphrase into new buffer */
1601 ret = os_malloc(*keylen);
1602 if (ret)
1603 os_memcpy(ret, str + 1, *keylen);
1604
1605 out:
1606 /* return new buffer */
1607 os_free(buf);
1608 return ret;
1609 }
1610
1611
radius_free_class(struct radius_class_data * c)1612 void radius_free_class(struct radius_class_data *c)
1613 {
1614 size_t i;
1615 if (c == NULL)
1616 return;
1617 for (i = 0; i < c->count; i++)
1618 os_free(c->attr[i].data);
1619 os_free(c->attr);
1620 c->attr = NULL;
1621 c->count = 0;
1622 }
1623
1624
radius_copy_class(struct radius_class_data * dst,const struct radius_class_data * src)1625 int radius_copy_class(struct radius_class_data *dst,
1626 const struct radius_class_data *src)
1627 {
1628 size_t i;
1629
1630 if (src->attr == NULL)
1631 return 0;
1632
1633 dst->attr = os_calloc(src->count, sizeof(struct radius_attr_data));
1634 if (dst->attr == NULL)
1635 return -1;
1636
1637 dst->count = 0;
1638
1639 for (i = 0; i < src->count; i++) {
1640 dst->attr[i].data = os_malloc(src->attr[i].len);
1641 if (dst->attr[i].data == NULL)
1642 break;
1643 dst->count++;
1644 os_memcpy(dst->attr[i].data, src->attr[i].data,
1645 src->attr[i].len);
1646 dst->attr[i].len = src->attr[i].len;
1647 }
1648
1649 return 0;
1650 }
1651
1652
radius_msg_find_unlisted_attr(struct radius_msg * msg,u8 * attrs)1653 u8 radius_msg_find_unlisted_attr(struct radius_msg *msg, u8 *attrs)
1654 {
1655 size_t i, j;
1656 struct radius_attr_hdr *attr;
1657
1658 for (i = 0; i < msg->attr_used; i++) {
1659 attr = radius_get_attr_hdr(msg, i);
1660
1661 for (j = 0; attrs[j]; j++) {
1662 if (attr->type == attrs[j])
1663 break;
1664 }
1665
1666 if (attrs[j] == 0)
1667 return attr->type; /* unlisted attr */
1668 }
1669
1670 return 0;
1671 }
1672