1 /*
2 * RADIUS message processing
3 * Copyright (c) 2002-2009, 2011-2022, 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 u16 type; /* 0..255 for basic types;
163 * (241 << 8) | <ext-type> for extended types */
164 char *name;
165 enum {
166 RADIUS_ATTR_UNDIST, RADIUS_ATTR_TEXT, RADIUS_ATTR_IP,
167 RADIUS_ATTR_HEXDUMP, RADIUS_ATTR_INT32, RADIUS_ATTR_IPV6
168 } data_type;
169 };
170
171 static const struct radius_attr_type radius_attrs[] =
172 {
173 { RADIUS_ATTR_USER_NAME, "User-Name", RADIUS_ATTR_TEXT },
174 { RADIUS_ATTR_USER_PASSWORD, "User-Password", RADIUS_ATTR_UNDIST },
175 { RADIUS_ATTR_NAS_IP_ADDRESS, "NAS-IP-Address", RADIUS_ATTR_IP },
176 { RADIUS_ATTR_NAS_PORT, "NAS-Port", RADIUS_ATTR_INT32 },
177 { RADIUS_ATTR_SERVICE_TYPE, "Service-Type", RADIUS_ATTR_INT32 },
178 { RADIUS_ATTR_FRAMED_IP_ADDRESS, "Framed-IP-Address", RADIUS_ATTR_IP },
179 { RADIUS_ATTR_FILTER_ID, "Filter-Id", RADIUS_ATTR_TEXT },
180 { RADIUS_ATTR_FRAMED_MTU, "Framed-MTU", RADIUS_ATTR_INT32 },
181 { RADIUS_ATTR_REPLY_MESSAGE, "Reply-Message", RADIUS_ATTR_TEXT },
182 { RADIUS_ATTR_STATE, "State", RADIUS_ATTR_UNDIST },
183 { RADIUS_ATTR_CLASS, "Class", RADIUS_ATTR_UNDIST },
184 { RADIUS_ATTR_VENDOR_SPECIFIC, "Vendor-Specific", RADIUS_ATTR_UNDIST },
185 { RADIUS_ATTR_SESSION_TIMEOUT, "Session-Timeout", RADIUS_ATTR_INT32 },
186 { RADIUS_ATTR_IDLE_TIMEOUT, "Idle-Timeout", RADIUS_ATTR_INT32 },
187 { RADIUS_ATTR_TERMINATION_ACTION, "Termination-Action",
188 RADIUS_ATTR_INT32 },
189 { RADIUS_ATTR_CALLED_STATION_ID, "Called-Station-Id",
190 RADIUS_ATTR_TEXT },
191 { RADIUS_ATTR_CALLING_STATION_ID, "Calling-Station-Id",
192 RADIUS_ATTR_TEXT },
193 { RADIUS_ATTR_NAS_IDENTIFIER, "NAS-Identifier", RADIUS_ATTR_TEXT },
194 { RADIUS_ATTR_PROXY_STATE, "Proxy-State", RADIUS_ATTR_UNDIST },
195 { RADIUS_ATTR_ACCT_STATUS_TYPE, "Acct-Status-Type",
196 RADIUS_ATTR_INT32 },
197 { RADIUS_ATTR_ACCT_DELAY_TIME, "Acct-Delay-Time", RADIUS_ATTR_INT32 },
198 { RADIUS_ATTR_ACCT_INPUT_OCTETS, "Acct-Input-Octets",
199 RADIUS_ATTR_INT32 },
200 { RADIUS_ATTR_ACCT_OUTPUT_OCTETS, "Acct-Output-Octets",
201 RADIUS_ATTR_INT32 },
202 { RADIUS_ATTR_ACCT_SESSION_ID, "Acct-Session-Id", RADIUS_ATTR_TEXT },
203 { RADIUS_ATTR_ACCT_AUTHENTIC, "Acct-Authentic", RADIUS_ATTR_INT32 },
204 { RADIUS_ATTR_ACCT_SESSION_TIME, "Acct-Session-Time",
205 RADIUS_ATTR_INT32 },
206 { RADIUS_ATTR_ACCT_INPUT_PACKETS, "Acct-Input-Packets",
207 RADIUS_ATTR_INT32 },
208 { RADIUS_ATTR_ACCT_OUTPUT_PACKETS, "Acct-Output-Packets",
209 RADIUS_ATTR_INT32 },
210 { RADIUS_ATTR_ACCT_TERMINATE_CAUSE, "Acct-Terminate-Cause",
211 RADIUS_ATTR_INT32 },
212 { RADIUS_ATTR_ACCT_MULTI_SESSION_ID, "Acct-Multi-Session-Id",
213 RADIUS_ATTR_TEXT },
214 { RADIUS_ATTR_ACCT_LINK_COUNT, "Acct-Link-Count", RADIUS_ATTR_INT32 },
215 { RADIUS_ATTR_ACCT_INPUT_GIGAWORDS, "Acct-Input-Gigawords",
216 RADIUS_ATTR_INT32 },
217 { RADIUS_ATTR_ACCT_OUTPUT_GIGAWORDS, "Acct-Output-Gigawords",
218 RADIUS_ATTR_INT32 },
219 { RADIUS_ATTR_EVENT_TIMESTAMP, "Event-Timestamp",
220 RADIUS_ATTR_INT32 },
221 { RADIUS_ATTR_EGRESS_VLANID, "EGRESS-VLANID", RADIUS_ATTR_HEXDUMP },
222 { RADIUS_ATTR_NAS_PORT_TYPE, "NAS-Port-Type", RADIUS_ATTR_INT32 },
223 { RADIUS_ATTR_TUNNEL_TYPE, "Tunnel-Type", RADIUS_ATTR_HEXDUMP },
224 { RADIUS_ATTR_TUNNEL_MEDIUM_TYPE, "Tunnel-Medium-Type",
225 RADIUS_ATTR_HEXDUMP },
226 { RADIUS_ATTR_TUNNEL_PASSWORD, "Tunnel-Password",
227 RADIUS_ATTR_UNDIST },
228 { RADIUS_ATTR_CONNECT_INFO, "Connect-Info", RADIUS_ATTR_TEXT },
229 { RADIUS_ATTR_EAP_MESSAGE, "EAP-Message", RADIUS_ATTR_UNDIST },
230 { RADIUS_ATTR_MESSAGE_AUTHENTICATOR, "Message-Authenticator",
231 RADIUS_ATTR_UNDIST },
232 { RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID, "Tunnel-Private-Group-Id",
233 RADIUS_ATTR_HEXDUMP },
234 { RADIUS_ATTR_ACCT_INTERIM_INTERVAL, "Acct-Interim-Interval",
235 RADIUS_ATTR_INT32 },
236 { RADIUS_ATTR_CHARGEABLE_USER_IDENTITY, "Chargeable-User-Identity",
237 RADIUS_ATTR_TEXT },
238 { RADIUS_ATTR_NAS_IPV6_ADDRESS, "NAS-IPv6-Address", RADIUS_ATTR_IPV6 },
239 { RADIUS_ATTR_ERROR_CAUSE, "Error-Cause", RADIUS_ATTR_INT32 },
240 { RADIUS_ATTR_EAP_KEY_NAME, "EAP-Key-Name", RADIUS_ATTR_HEXDUMP },
241 { RADIUS_ATTR_OPERATOR_NAME, "Operator-Name", RADIUS_ATTR_TEXT },
242 { RADIUS_ATTR_LOCATION_INFO, "Location-Information",
243 RADIUS_ATTR_HEXDUMP },
244 { RADIUS_ATTR_LOCATION_DATA, "Location-Data", RADIUS_ATTR_HEXDUMP },
245 { RADIUS_ATTR_BASIC_LOCATION_POLICY_RULES,
246 "Basic-Location-Policy-Rules", RADIUS_ATTR_HEXDUMP },
247 { RADIUS_ATTR_EXTENDED_LOCATION_POLICY_RULES,
248 "Extended-Location-Policy-Rules", RADIUS_ATTR_HEXDUMP },
249 { RADIUS_ATTR_LOCATION_CAPABLE, "Location-Capable", RADIUS_ATTR_INT32 },
250 { RADIUS_ATTR_REQUESTED_LOCATION_INFO, "Requested-Location-Info",
251 RADIUS_ATTR_INT32 },
252 { RADIUS_ATTR_MOBILITY_DOMAIN_ID, "Mobility-Domain-Id",
253 RADIUS_ATTR_INT32 },
254 { RADIUS_ATTR_WLAN_HESSID, "WLAN-HESSID", RADIUS_ATTR_TEXT },
255 { RADIUS_ATTR_WLAN_REASON_CODE, "WLAN-Reason-Code",
256 RADIUS_ATTR_INT32 },
257 { RADIUS_ATTR_WLAN_PAIRWISE_CIPHER, "WLAN-Pairwise-Cipher",
258 RADIUS_ATTR_HEXDUMP },
259 { RADIUS_ATTR_WLAN_GROUP_CIPHER, "WLAN-Group-Cipher",
260 RADIUS_ATTR_HEXDUMP },
261 { RADIUS_ATTR_WLAN_AKM_SUITE, "WLAN-AKM-Suite",
262 RADIUS_ATTR_HEXDUMP },
263 { RADIUS_ATTR_WLAN_GROUP_MGMT_CIPHER, "WLAN-Group-Mgmt-Pairwise-Cipher",
264 RADIUS_ATTR_HEXDUMP },
265 { RADIUS_ATTR_EXT_TYPE_1, "Extended-Type-1", RADIUS_ATTR_UNDIST },
266 { RADIUS_ATTR_EXT_TYPE_2, "Extended-Type-2", RADIUS_ATTR_UNDIST },
267 { RADIUS_ATTR_EXT_TYPE_3, "Extended-Type-3", RADIUS_ATTR_UNDIST },
268 { RADIUS_ATTR_EXT_TYPE_4, "Extended-Type-4", RADIUS_ATTR_UNDIST },
269 { RADIUS_ATTR_LONG_EXT_TYPE_1, "Long-Extended-Type-1",
270 RADIUS_ATTR_UNDIST },
271 { RADIUS_ATTR_LONG_EXT_TYPE_2, "Long-Extended-Type-2",
272 RADIUS_ATTR_UNDIST },
273 { RADIUS_ATTR_EXT_VENDOR_SPECIFIC_1, "Extended-Vendor-Specific-1",
274 RADIUS_ATTR_UNDIST },
275 { RADIUS_ATTR_EXT_VENDOR_SPECIFIC_2, "Extended-Vendor-Specific-2",
276 RADIUS_ATTR_UNDIST },
277 { RADIUS_ATTR_EXT_VENDOR_SPECIFIC_3, "Extended-Vendor-Specific-3",
278 RADIUS_ATTR_UNDIST },
279 { RADIUS_ATTR_EXT_VENDOR_SPECIFIC_4, "Extended-Vendor-Specific-4",
280 RADIUS_ATTR_UNDIST },
281 { RADIUS_ATTR_EXT_VENDOR_SPECIFIC_5, "Extended-Vendor-Specific-5",
282 RADIUS_ATTR_UNDIST },
283 { RADIUS_ATTR_EXT_VENDOR_SPECIFIC_6, "Extended-Vendor-Specific-6",
284 RADIUS_ATTR_UNDIST },
285 };
286 #define RADIUS_ATTRS ARRAY_SIZE(radius_attrs)
287
288
radius_get_attr_type(u16 type)289 static const struct radius_attr_type * radius_get_attr_type(u16 type)
290 {
291 size_t i;
292
293 for (i = 0; i < RADIUS_ATTRS; i++) {
294 if (type == radius_attrs[i].type)
295 return &radius_attrs[i];
296 }
297
298 return NULL;
299 }
300
301
radius_is_long_ext_type(u8 type)302 static bool radius_is_long_ext_type(u8 type)
303 {
304 return type == RADIUS_ATTR_LONG_EXT_TYPE_1 ||
305 type == RADIUS_ATTR_LONG_EXT_TYPE_2;
306 }
307
308
radius_is_ext_type(u8 type)309 static bool radius_is_ext_type(u8 type)
310 {
311 return type >= RADIUS_ATTR_EXT_TYPE_1 &&
312 type <= RADIUS_ATTR_LONG_EXT_TYPE_2;
313 }
314
315
radius_msg_dump_attr(struct radius_attr_hdr * hdr)316 static void radius_msg_dump_attr(struct radius_attr_hdr *hdr)
317 {
318 struct radius_attr_hdr_ext *ext = NULL;
319 const struct radius_attr_type *attr;
320 int len;
321 unsigned char *pos;
322 char buf[1000];
323
324 if (hdr->length < sizeof(struct radius_attr_hdr))
325 return;
326
327 if (radius_is_ext_type(hdr->type)) {
328 if (hdr->length < 4) {
329 wpa_printf(MSG_INFO,
330 " Invalid attribute %d (too short for extended type)",
331 hdr->type);
332 return;
333 }
334
335 ext = (struct radius_attr_hdr_ext *) hdr;
336 }
337
338 if (ext) {
339 attr = radius_get_attr_type((ext->type << 8) | ext->ext_type);
340 wpa_printf(MSG_INFO, " Attribute %d.%d (%s) length=%d",
341 ext->type, ext->ext_type,
342 attr ? attr->name : "?Unknown?", ext->length);
343 pos = (unsigned char *) (ext + 1);
344 len = ext->length - sizeof(struct radius_attr_hdr_ext);
345 } else {
346 attr = radius_get_attr_type(hdr->type);
347 wpa_printf(MSG_INFO, " Attribute %d (%s) length=%d",
348 hdr->type, attr ? attr->name : "?Unknown?",
349 hdr->length);
350 pos = (unsigned char *) (hdr + 1);
351 len = hdr->length - sizeof(struct radius_attr_hdr);
352 }
353
354 if (!attr)
355 return;
356
357 switch (attr->data_type) {
358 case RADIUS_ATTR_TEXT:
359 printf_encode(buf, sizeof(buf), pos, len);
360 wpa_printf(MSG_INFO, " Value: '%s'", buf);
361 break;
362
363 case RADIUS_ATTR_IP:
364 if (len == 4) {
365 struct in_addr addr;
366 os_memcpy(&addr, pos, 4);
367 wpa_printf(MSG_INFO, " Value: %s",
368 inet_ntoa(addr));
369 } else {
370 wpa_printf(MSG_INFO, " Invalid IP address length %d",
371 len);
372 }
373 break;
374
375 #ifdef CONFIG_IPV6
376 case RADIUS_ATTR_IPV6:
377 if (len == 16) {
378 const char *atxt;
379 struct in6_addr *addr = (struct in6_addr *) pos;
380 atxt = inet_ntop(AF_INET6, addr, buf, sizeof(buf));
381 wpa_printf(MSG_INFO, " Value: %s",
382 atxt ? atxt : "?");
383 } else {
384 wpa_printf(MSG_INFO, " Invalid IPv6 address length %d",
385 len);
386 }
387 break;
388 #endif /* CONFIG_IPV6 */
389
390 case RADIUS_ATTR_HEXDUMP:
391 case RADIUS_ATTR_UNDIST:
392 wpa_snprintf_hex(buf, sizeof(buf), pos, len);
393 wpa_printf(MSG_INFO, " Value: %s", buf);
394 break;
395
396 case RADIUS_ATTR_INT32:
397 if (len == 4)
398 wpa_printf(MSG_INFO, " Value: %u",
399 WPA_GET_BE32(pos));
400 else
401 wpa_printf(MSG_INFO, " Invalid INT32 length %d",
402 len);
403 break;
404
405 default:
406 break;
407 }
408 }
409
410
radius_msg_dump(struct radius_msg * msg)411 void radius_msg_dump(struct radius_msg *msg)
412 {
413 size_t i;
414
415 wpa_printf(MSG_INFO, "RADIUS message: code=%d (%s) identifier=%d length=%d",
416 msg->hdr->code, radius_code_string(msg->hdr->code),
417 msg->hdr->identifier, be_to_host16(msg->hdr->length));
418
419 for (i = 0; i < msg->attr_used; i++) {
420 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
421 radius_msg_dump_attr(attr);
422 }
423 }
424
425
radius_msg_add_msg_auth(struct radius_msg * msg)426 u8 * radius_msg_add_msg_auth(struct radius_msg *msg)
427 {
428 u8 auth[MD5_MAC_LEN];
429 struct radius_attr_hdr *attr;
430
431 os_memset(auth, 0, MD5_MAC_LEN);
432 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
433 auth, MD5_MAC_LEN);
434 if (!attr) {
435 wpa_printf(MSG_ERROR,
436 "WARNING: Could not add Message-Authenticator");
437 return NULL;
438 }
439
440 return (u8 *) (attr + 1);
441 }
442
443
radius_msg_auth_pos(struct radius_msg * msg)444 static u8 * radius_msg_auth_pos(struct radius_msg *msg)
445 {
446 u8 *pos;
447 size_t alen;
448
449 if (radius_msg_get_attr_ptr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
450 &pos, &alen, NULL) == 0 &&
451 alen == MD5_MAC_LEN) {
452 /* Use already added Message-Authenticator attribute */
453 return pos;
454 }
455
456 /* Add a Message-Authenticator attribute */
457 return radius_msg_add_msg_auth(msg);
458 }
459
460
radius_msg_finish(struct radius_msg * msg,const u8 * secret,size_t secret_len)461 int radius_msg_finish(struct radius_msg *msg, const u8 *secret,
462 size_t secret_len)
463 {
464 if (secret) {
465 u8 *pos;
466
467 pos = radius_msg_auth_pos(msg);
468 if (!pos)
469 return -1;
470 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
471 if (hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
472 wpabuf_len(msg->buf), pos) < 0) {
473 wpa_printf(MSG_INFO, "RADIUS: MD5 not available");
474 return -1;
475 }
476 } else
477 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
478
479 if (wpabuf_len(msg->buf) > 0xffff) {
480 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
481 (unsigned long) wpabuf_len(msg->buf));
482 return -1;
483 }
484 return 0;
485 }
486
487
radius_msg_finish_srv(struct radius_msg * msg,const u8 * secret,size_t secret_len,const u8 * req_authenticator)488 int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret,
489 size_t secret_len, const u8 *req_authenticator)
490 {
491 const u8 *addr[4];
492 size_t len[4];
493 u8 *pos;
494
495 pos = radius_msg_auth_pos(msg);
496 if (!pos)
497 return -1;
498 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
499 os_memcpy(msg->hdr->authenticator, req_authenticator,
500 sizeof(msg->hdr->authenticator));
501 if (hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
502 wpabuf_len(msg->buf), pos) < 0) {
503 wpa_printf(MSG_INFO, "RADIUS: MD5 not available");
504 return -1;
505 }
506
507 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
508 addr[0] = (u8 *) msg->hdr;
509 len[0] = 1 + 1 + 2;
510 addr[1] = req_authenticator;
511 len[1] = MD5_MAC_LEN;
512 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
513 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
514 addr[3] = secret;
515 len[3] = secret_len;
516 if (md5_vector(4, addr, len, msg->hdr->authenticator) < 0) {
517 wpa_printf(MSG_INFO, "RADIUS: MD5 not available");
518 return -1;
519 }
520
521 if (wpabuf_len(msg->buf) > 0xffff) {
522 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
523 (unsigned long) wpabuf_len(msg->buf));
524 return -1;
525 }
526 return 0;
527 }
528
529
radius_msg_finish_das_resp(struct radius_msg * msg,const u8 * secret,size_t secret_len,const struct radius_hdr * req_hdr)530 int radius_msg_finish_das_resp(struct radius_msg *msg, const u8 *secret,
531 size_t secret_len,
532 const struct radius_hdr *req_hdr)
533 {
534 const u8 *addr[2];
535 size_t len[2];
536 u8 *pos;
537
538 pos = radius_msg_auth_pos(msg);
539 if (!pos)
540 return -1;
541
542 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
543 os_memcpy(msg->hdr->authenticator, req_hdr->authenticator, 16);
544 if (hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
545 wpabuf_len(msg->buf), pos) < 0) {
546 wpa_printf(MSG_INFO, "RADIUS: MD5 not available");
547 return -1;
548 }
549
550 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
551 addr[0] = wpabuf_head_u8(msg->buf);
552 len[0] = wpabuf_len(msg->buf);
553 addr[1] = secret;
554 len[1] = secret_len;
555 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0) {
556 wpa_printf(MSG_INFO, "RADIUS: MD5 not available");
557 return -1;
558 }
559
560 if (wpabuf_len(msg->buf) > 0xffff) {
561 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
562 (unsigned long) wpabuf_len(msg->buf));
563 return -1;
564 }
565 return 0;
566 }
567
568
radius_msg_finish_acct(struct radius_msg * msg,const u8 * secret,size_t secret_len)569 int radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret,
570 size_t secret_len)
571 {
572 const u8 *addr[2];
573 size_t len[2];
574
575 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
576 os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN);
577 addr[0] = wpabuf_head(msg->buf);
578 len[0] = wpabuf_len(msg->buf);
579 addr[1] = secret;
580 len[1] = secret_len;
581 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0) {
582 wpa_printf(MSG_INFO, "RADIUS: MD5 not available");
583 return -1;
584 }
585
586 if (wpabuf_len(msg->buf) > 0xffff) {
587 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
588 (unsigned long) wpabuf_len(msg->buf));
589 return -1;
590 }
591 return 0;
592 }
593
594
radius_msg_finish_acct_resp(struct radius_msg * msg,const u8 * secret,size_t secret_len,const u8 * req_authenticator)595 int radius_msg_finish_acct_resp(struct radius_msg *msg, const u8 *secret,
596 size_t secret_len, const u8 *req_authenticator)
597 {
598 const u8 *addr[2];
599 size_t len[2];
600
601 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
602 os_memcpy(msg->hdr->authenticator, req_authenticator, MD5_MAC_LEN);
603 addr[0] = wpabuf_head(msg->buf);
604 len[0] = wpabuf_len(msg->buf);
605 addr[1] = secret;
606 len[1] = secret_len;
607 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0) {
608 wpa_printf(MSG_INFO, "RADIUS: MD5 not available");
609 return -1;
610 }
611
612 if (wpabuf_len(msg->buf) > 0xffff) {
613 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
614 (unsigned long) wpabuf_len(msg->buf));
615 return -1;
616 }
617 return 0;
618 }
619
620
radius_msg_verify_acct_req(struct radius_msg * msg,const u8 * secret,size_t secret_len)621 int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret,
622 size_t secret_len)
623 {
624 const u8 *addr[4];
625 size_t len[4];
626 u8 zero[MD5_MAC_LEN];
627 u8 hash[MD5_MAC_LEN];
628
629 os_memset(zero, 0, sizeof(zero));
630 addr[0] = (u8 *) msg->hdr;
631 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
632 addr[1] = zero;
633 len[1] = MD5_MAC_LEN;
634 addr[2] = (u8 *) (msg->hdr + 1);
635 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
636 addr[3] = secret;
637 len[3] = secret_len;
638 if (md5_vector(4, addr, len, hash) < 0) {
639 wpa_printf(MSG_INFO, "RADIUS: MD5 not available");
640 return 1;
641 }
642 return os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0;
643 }
644
645
radius_msg_verify_das_req(struct radius_msg * msg,const u8 * secret,size_t secret_len,int require_message_authenticator)646 int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret,
647 size_t secret_len,
648 int require_message_authenticator)
649 {
650 const u8 *addr[4];
651 size_t len[4];
652 u8 zero[MD5_MAC_LEN];
653 u8 hash[MD5_MAC_LEN];
654 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
655 u8 orig_authenticator[16];
656
657 struct radius_attr_hdr *attr = NULL, *tmp;
658 size_t i;
659
660 os_memset(zero, 0, sizeof(zero));
661 addr[0] = (u8 *) msg->hdr;
662 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
663 addr[1] = zero;
664 len[1] = MD5_MAC_LEN;
665 addr[2] = (u8 *) (msg->hdr + 1);
666 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
667 addr[3] = secret;
668 len[3] = secret_len;
669 if (md5_vector(4, addr, len, hash) < 0) {
670 wpa_printf(MSG_INFO, "RADIUS: MD5 not available");
671 return 1;
672 }
673 if (os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0)
674 return 1;
675
676 for (i = 0; i < msg->attr_used; i++) {
677 tmp = radius_get_attr_hdr(msg, i);
678 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
679 if (attr != NULL) {
680 wpa_printf(MSG_WARNING, "Multiple "
681 "Message-Authenticator attributes "
682 "in RADIUS message");
683 return 1;
684 }
685 attr = tmp;
686 }
687 }
688
689 if (attr == NULL) {
690 if (require_message_authenticator) {
691 wpa_printf(MSG_WARNING,
692 "Missing Message-Authenticator attribute in RADIUS message");
693 return 1;
694 }
695 return 0;
696 }
697
698 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
699 os_memset(attr + 1, 0, MD5_MAC_LEN);
700 os_memcpy(orig_authenticator, msg->hdr->authenticator,
701 sizeof(orig_authenticator));
702 os_memset(msg->hdr->authenticator, 0,
703 sizeof(msg->hdr->authenticator));
704 if (hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
705 wpabuf_len(msg->buf), auth) < 0) {
706 wpa_printf(MSG_INFO, "RADIUS: MD5 not available");
707 return 1;
708 }
709 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
710 os_memcpy(msg->hdr->authenticator, orig_authenticator,
711 sizeof(orig_authenticator));
712
713 return os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0;
714 }
715
716
radius_msg_add_attr_to_array(struct radius_msg * msg,struct radius_attr_hdr * attr)717 static int radius_msg_add_attr_to_array(struct radius_msg *msg,
718 struct radius_attr_hdr *attr)
719 {
720 if (msg->attr_used >= msg->attr_size) {
721 size_t *nattr_pos;
722 size_t nlen = msg->attr_size * 2;
723
724 nattr_pos = os_realloc_array(msg->attr_pos, nlen,
725 sizeof(*msg->attr_pos));
726 if (nattr_pos == NULL)
727 return -1;
728
729 msg->attr_pos = nattr_pos;
730 msg->attr_size = nlen;
731 }
732
733 msg->attr_pos[msg->attr_used++] =
734 (unsigned char *) attr - wpabuf_head_u8(msg->buf);
735
736 return 0;
737 }
738
739
radius_msg_add_attr(struct radius_msg * msg,u16 type,const u8 * data,size_t data_len)740 struct radius_attr_hdr * radius_msg_add_attr(struct radius_msg *msg, u16 type,
741 const u8 *data, size_t data_len)
742 {
743 size_t buf_needed, max_len;
744 struct radius_attr_hdr *attr = NULL;
745 struct radius_attr_hdr_ext *ext;
746 u8 ext_type = 0;
747
748 if (TEST_FAIL())
749 return NULL;
750
751 if (type > 255) {
752 if (!radius_is_ext_type(type >> 8)) {
753 wpa_printf(MSG_ERROR,
754 "%s: Undefined extended type %d.%d",
755 __func__, type >> 8, type & 0xff);
756 return NULL;
757 }
758 ext_type = type & 0xff;
759 type >>= 8;
760 } else if (radius_is_ext_type(type)) {
761 wpa_printf(MSG_ERROR, "%s: Unexpected extended type use for %d",
762 __func__, type);
763 }
764
765 if (radius_is_long_ext_type(type)) {
766 size_t hdr_len = sizeof(struct radius_attr_hdr_ext) + 1;
767 size_t plen = 255 - hdr_len;
768 size_t num;
769
770 max_len = 4096;
771 num = (data_len + plen - 1) / plen;
772 if (num == 0)
773 num = 1;
774 buf_needed = num * hdr_len + data_len;
775 } else if (radius_is_ext_type(type)) {
776 max_len = RADIUS_MAX_EXT_ATTR_LEN;
777 buf_needed = sizeof(struct radius_attr_hdr_ext) + data_len;
778 } else {
779 max_len = RADIUS_MAX_ATTR_LEN;
780 buf_needed = sizeof(*attr) + data_len;
781 }
782 if (data_len > max_len) {
783 wpa_printf(MSG_ERROR,
784 "%s: too long attribute (%zu > %zu bytes)",
785 __func__, data_len, max_len);
786 return NULL;
787 }
788
789 if (wpabuf_tailroom(msg->buf) < buf_needed) {
790 /* allocate more space for message buffer */
791 if (wpabuf_resize(&msg->buf, buf_needed) < 0)
792 return NULL;
793 msg->hdr = wpabuf_mhead(msg->buf);
794 }
795
796 if (radius_is_long_ext_type(type)) {
797 size_t plen = 255 - sizeof(struct radius_attr_hdr_ext) - 1;
798 size_t alen;
799
800 do {
801 alen = data_len > plen ? plen : data_len;
802 ext = wpabuf_put(msg->buf,
803 sizeof(struct radius_attr_hdr_ext));
804 if (!attr)
805 attr = (struct radius_attr_hdr *) ext;
806 ext->type = type;
807 ext->length = sizeof(*ext) + 1 + alen;
808 ext->ext_type = ext_type;
809 wpabuf_put_u8(msg->buf, data_len > alen ? 0x80 : 0);
810 wpabuf_put_data(msg->buf, data, data_len);
811 data += alen;
812 data_len -= alen;
813 if (radius_msg_add_attr_to_array(
814 msg, (struct radius_attr_hdr *) ext))
815 return NULL;
816 } while (data_len > 0);
817 } else if (radius_is_ext_type(type)) {
818 ext = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr_ext));
819 attr = (struct radius_attr_hdr *) ext;
820 ext->type = type;
821 ext->length = sizeof(*ext) + data_len;
822 ext->ext_type = ext_type;
823 wpabuf_put_data(msg->buf, data, data_len);
824 if (radius_msg_add_attr_to_array(msg, attr))
825 return NULL;
826 } else {
827 attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr));
828 attr->type = type;
829 attr->length = sizeof(*attr) + data_len;
830 wpabuf_put_data(msg->buf, data, data_len);
831 if (radius_msg_add_attr_to_array(msg, attr))
832 return NULL;
833 }
834
835 return attr;
836 }
837
838
839 /**
840 * radius_msg_parse - Parse a RADIUS message
841 * @data: RADIUS message to be parsed
842 * @len: Length of data buffer in octets
843 * Returns: Parsed RADIUS message or %NULL on failure
844 *
845 * This parses a RADIUS message and makes a copy of its data. The caller is
846 * responsible for freeing the returned data with radius_msg_free().
847 */
radius_msg_parse(const u8 * data,size_t len)848 struct radius_msg * radius_msg_parse(const u8 *data, size_t len)
849 {
850 struct radius_msg *msg;
851 struct radius_hdr *hdr;
852 struct radius_attr_hdr *attr;
853 size_t msg_len;
854 unsigned char *pos, *end;
855
856 if (data == NULL || len < sizeof(*hdr))
857 return NULL;
858
859 hdr = (struct radius_hdr *) data;
860
861 msg_len = be_to_host16(hdr->length);
862 if (msg_len < sizeof(*hdr) || msg_len > len) {
863 wpa_printf(MSG_INFO, "RADIUS: Invalid message length");
864 return NULL;
865 }
866
867 if (msg_len < len) {
868 wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after "
869 "RADIUS message", (unsigned long) len - msg_len);
870 }
871
872 msg = os_zalloc(sizeof(*msg));
873 if (msg == NULL)
874 return NULL;
875
876 msg->buf = wpabuf_alloc_copy(data, msg_len);
877 if (msg->buf == NULL || radius_msg_initialize(msg)) {
878 radius_msg_free(msg);
879 return NULL;
880 }
881 msg->hdr = wpabuf_mhead(msg->buf);
882
883 /* parse attributes */
884 pos = wpabuf_mhead_u8(msg->buf) + sizeof(struct radius_hdr);
885 end = wpabuf_mhead_u8(msg->buf) + wpabuf_len(msg->buf);
886 while (pos < end) {
887 if ((size_t) (end - pos) < sizeof(*attr))
888 goto fail;
889
890 attr = (struct radius_attr_hdr *) pos;
891
892 if (attr->length > end - pos || attr->length < sizeof(*attr))
893 goto fail;
894
895 /* TODO: check that attr->length is suitable for attr->type */
896
897 if (radius_msg_add_attr_to_array(msg, attr))
898 goto fail;
899
900 pos += attr->length;
901 }
902
903 return msg;
904
905 fail:
906 radius_msg_free(msg);
907 return NULL;
908 }
909
910
radius_msg_add_eap(struct radius_msg * msg,const u8 * data,size_t data_len)911 int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len)
912 {
913 const u8 *pos = data;
914 size_t left = data_len;
915
916 while (left > 0) {
917 int len;
918 if (left > RADIUS_MAX_ATTR_LEN)
919 len = RADIUS_MAX_ATTR_LEN;
920 else
921 len = left;
922
923 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE,
924 pos, len))
925 return 0;
926
927 pos += len;
928 left -= len;
929 }
930
931 return 1;
932 }
933
934
radius_msg_get_eap(struct radius_msg * msg)935 struct wpabuf * radius_msg_get_eap(struct radius_msg *msg)
936 {
937 struct wpabuf *eap;
938 size_t len, i;
939 struct radius_attr_hdr *attr;
940
941 if (msg == NULL)
942 return NULL;
943
944 len = 0;
945 for (i = 0; i < msg->attr_used; i++) {
946 attr = radius_get_attr_hdr(msg, i);
947 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
948 attr->length > sizeof(struct radius_attr_hdr))
949 len += attr->length - sizeof(struct radius_attr_hdr);
950 }
951
952 if (len == 0)
953 return NULL;
954
955 eap = wpabuf_alloc(len);
956 if (eap == NULL)
957 return NULL;
958
959 for (i = 0; i < msg->attr_used; i++) {
960 attr = radius_get_attr_hdr(msg, i);
961 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
962 attr->length > sizeof(struct radius_attr_hdr)) {
963 int flen = attr->length - sizeof(*attr);
964 wpabuf_put_data(eap, attr + 1, flen);
965 }
966 }
967
968 return eap;
969 }
970
971
radius_msg_verify_msg_auth(struct radius_msg * msg,const u8 * secret,size_t secret_len,const u8 * req_auth)972 int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret,
973 size_t secret_len, const u8 *req_auth)
974 {
975 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
976 u8 orig_authenticator[16];
977 struct radius_attr_hdr *attr = NULL, *tmp;
978 size_t i;
979
980 for (i = 0; i < msg->attr_used; i++) {
981 tmp = radius_get_attr_hdr(msg, i);
982 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
983 if (attr != NULL) {
984 wpa_printf(MSG_INFO, "Multiple Message-Authenticator attributes in RADIUS message");
985 return 1;
986 }
987 attr = tmp;
988 }
989 }
990
991 if (attr == NULL) {
992 wpa_printf(MSG_INFO, "No Message-Authenticator attribute found");
993 return 1;
994 }
995
996 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
997 os_memset(attr + 1, 0, MD5_MAC_LEN);
998 if (req_auth) {
999 os_memcpy(orig_authenticator, msg->hdr->authenticator,
1000 sizeof(orig_authenticator));
1001 os_memcpy(msg->hdr->authenticator, req_auth,
1002 sizeof(msg->hdr->authenticator));
1003 }
1004 if (hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
1005 wpabuf_len(msg->buf), auth) < 0) {
1006 wpa_printf(MSG_INFO, "RADIUS: MD5 not available");
1007 return 1;
1008 }
1009 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
1010 if (req_auth) {
1011 os_memcpy(msg->hdr->authenticator, orig_authenticator,
1012 sizeof(orig_authenticator));
1013 }
1014
1015 if (os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0) {
1016 wpa_printf(MSG_INFO, "Invalid Message-Authenticator!");
1017 return 1;
1018 }
1019
1020 return 0;
1021 }
1022
1023
radius_msg_verify(struct radius_msg * msg,const u8 * secret,size_t secret_len,struct radius_msg * sent_msg,int auth)1024 int radius_msg_verify(struct radius_msg *msg, const u8 *secret,
1025 size_t secret_len, struct radius_msg *sent_msg, int auth)
1026 {
1027 const u8 *addr[4];
1028 size_t len[4];
1029 u8 hash[MD5_MAC_LEN];
1030
1031 if (sent_msg == NULL) {
1032 wpa_printf(MSG_INFO, "No matching Access-Request message found");
1033 return 1;
1034 }
1035
1036 if (!auth) {
1037 u8 *pos;
1038 size_t alen;
1039
1040 if (radius_msg_get_attr_ptr(msg,
1041 RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
1042 &pos, &alen, NULL) == 0) {
1043 /* Check the Message-Authenticator attribute since it
1044 * was included even if we are configured to not
1045 * require it. */
1046 auth = 1;
1047 }
1048 }
1049
1050 if (auth &&
1051 radius_msg_verify_msg_auth(msg, secret, secret_len,
1052 sent_msg->hdr->authenticator)) {
1053 return 1;
1054 }
1055
1056 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
1057 addr[0] = (u8 *) msg->hdr;
1058 len[0] = 1 + 1 + 2;
1059 addr[1] = sent_msg->hdr->authenticator;
1060 len[1] = MD5_MAC_LEN;
1061 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
1062 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
1063 addr[3] = secret;
1064 len[3] = secret_len;
1065 if (md5_vector(4, addr, len, hash) < 0 ||
1066 os_memcmp_const(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) {
1067 wpa_printf(MSG_INFO, "Response Authenticator invalid!");
1068 return 1;
1069 }
1070
1071 return 0;
1072 }
1073
1074
radius_msg_copy_attr(struct radius_msg * dst,struct radius_msg * src,u8 type)1075 int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src,
1076 u8 type)
1077 {
1078 struct radius_attr_hdr *attr;
1079 size_t i;
1080 int count = 0;
1081
1082 for (i = 0; i < src->attr_used; i++) {
1083 attr = radius_get_attr_hdr(src, i);
1084 if (attr->type == type && attr->length >= sizeof(*attr)) {
1085 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1),
1086 attr->length - sizeof(*attr)))
1087 return -1;
1088 count++;
1089 }
1090 }
1091
1092 return count;
1093 }
1094
1095
1096 /* Create Request Authenticator. The value should be unique over the lifetime
1097 * of the shared secret between authenticator and authentication server.
1098 */
radius_msg_make_authenticator(struct radius_msg * msg)1099 int radius_msg_make_authenticator(struct radius_msg *msg)
1100 {
1101 return os_get_random((u8 *) &msg->hdr->authenticator,
1102 sizeof(msg->hdr->authenticator));
1103 }
1104
1105
1106 /* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message.
1107 * Returns the Attribute payload and sets alen to indicate the length of the
1108 * payload if a vendor attribute with subtype is found, otherwise returns NULL.
1109 * The returned payload is allocated with os_malloc() and caller must free it
1110 * by calling os_free().
1111 */
radius_msg_get_vendor_attr(struct radius_msg * msg,u32 vendor,u8 subtype,size_t * alen)1112 static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor,
1113 u8 subtype, size_t *alen)
1114 {
1115 u8 *data, *pos;
1116 size_t i, len;
1117
1118 if (msg == NULL)
1119 return NULL;
1120
1121 for (i = 0; i < msg->attr_used; i++) {
1122 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
1123 size_t left;
1124 u32 vendor_id;
1125 struct radius_attr_vendor *vhdr;
1126
1127 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC ||
1128 attr->length < sizeof(*attr))
1129 continue;
1130
1131 left = attr->length - sizeof(*attr);
1132 if (left < 4)
1133 continue;
1134
1135 pos = (u8 *) (attr + 1);
1136
1137 os_memcpy(&vendor_id, pos, 4);
1138 pos += 4;
1139 left -= 4;
1140
1141 if (ntohl(vendor_id) != vendor)
1142 continue;
1143
1144 while (left >= sizeof(*vhdr)) {
1145 vhdr = (struct radius_attr_vendor *) pos;
1146 if (vhdr->vendor_length > left ||
1147 vhdr->vendor_length < sizeof(*vhdr)) {
1148 break;
1149 }
1150 if (vhdr->vendor_type != subtype) {
1151 pos += vhdr->vendor_length;
1152 left -= vhdr->vendor_length;
1153 continue;
1154 }
1155
1156 len = vhdr->vendor_length - sizeof(*vhdr);
1157 data = os_memdup(pos + sizeof(*vhdr), len);
1158 if (data == NULL)
1159 return NULL;
1160 if (alen)
1161 *alen = len;
1162 return data;
1163 }
1164 }
1165
1166 return NULL;
1167 }
1168
1169
decrypt_ms_key(const u8 * key,size_t len,const u8 * req_authenticator,const u8 * secret,size_t secret_len,size_t * reslen)1170 static u8 * decrypt_ms_key(const u8 *key, size_t len,
1171 const u8 *req_authenticator,
1172 const u8 *secret, size_t secret_len, size_t *reslen)
1173 {
1174 u8 *plain, *ppos, *res;
1175 const u8 *pos;
1176 size_t left, plen;
1177 u8 hash[MD5_MAC_LEN];
1178 int i, first = 1;
1179 const u8 *addr[3];
1180 size_t elen[3];
1181
1182 /* key: 16-bit salt followed by encrypted key info */
1183
1184 if (len < 2 + 16) {
1185 wpa_printf(MSG_DEBUG, "RADIUS: %s: Len is too small: %d",
1186 __func__, (int) len);
1187 return NULL;
1188 }
1189
1190 pos = key + 2;
1191 left = len - 2;
1192 if (left % 16) {
1193 wpa_printf(MSG_INFO, "RADIUS: Invalid ms key len %lu",
1194 (unsigned long) left);
1195 return NULL;
1196 }
1197
1198 plen = left;
1199 ppos = plain = os_malloc(plen);
1200 if (plain == NULL)
1201 return NULL;
1202 plain[0] = 0;
1203
1204 while (left > 0) {
1205 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1206 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1207
1208 addr[0] = secret;
1209 elen[0] = secret_len;
1210 if (first) {
1211 addr[1] = req_authenticator;
1212 elen[1] = MD5_MAC_LEN;
1213 addr[2] = key;
1214 elen[2] = 2; /* Salt */
1215 } else {
1216 addr[1] = pos - MD5_MAC_LEN;
1217 elen[1] = MD5_MAC_LEN;
1218 }
1219 if (md5_vector(first ? 3 : 2, addr, elen, hash) < 0) {
1220 wpa_printf(MSG_INFO, "RADIUS: MD5 not available");
1221 os_free(plain);
1222 return NULL;
1223 }
1224 first = 0;
1225
1226 for (i = 0; i < MD5_MAC_LEN; i++)
1227 *ppos++ = *pos++ ^ hash[i];
1228 left -= MD5_MAC_LEN;
1229 }
1230
1231 if (plain[0] == 0 || plain[0] > plen - 1) {
1232 wpa_printf(MSG_INFO, "RADIUS: Failed to decrypt MPPE key");
1233 os_free(plain);
1234 return NULL;
1235 }
1236
1237 res = os_memdup(plain + 1, plain[0]);
1238 if (res == NULL) {
1239 os_free(plain);
1240 return NULL;
1241 }
1242 if (reslen)
1243 *reslen = plain[0];
1244 os_free(plain);
1245 return res;
1246 }
1247
1248
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)1249 static int encrypt_ms_key(const u8 *key, size_t key_len, u16 salt,
1250 const u8 *req_authenticator,
1251 const u8 *secret, size_t secret_len,
1252 u8 *ebuf, size_t *elen)
1253 {
1254 int i, len, first = 1;
1255 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos;
1256 const u8 *addr[3];
1257 size_t _len[3];
1258
1259 WPA_PUT_BE16(saltbuf, salt);
1260
1261 len = 1 + key_len;
1262 if (len & 0x0f) {
1263 len = (len & 0xf0) + 16;
1264 }
1265 os_memset(ebuf, 0, len);
1266 ebuf[0] = key_len;
1267 os_memcpy(ebuf + 1, key, key_len);
1268
1269 *elen = len;
1270
1271 pos = ebuf;
1272 while (len > 0) {
1273 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1274 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1275 addr[0] = secret;
1276 _len[0] = secret_len;
1277 if (first) {
1278 addr[1] = req_authenticator;
1279 _len[1] = MD5_MAC_LEN;
1280 addr[2] = saltbuf;
1281 _len[2] = sizeof(saltbuf);
1282 } else {
1283 addr[1] = pos - MD5_MAC_LEN;
1284 _len[1] = MD5_MAC_LEN;
1285 }
1286 if (md5_vector(first ? 3 : 2, addr, _len, hash) < 0) {
1287 wpa_printf(MSG_INFO, "RADIUS: MD5 not available");
1288 return -1;
1289 }
1290 first = 0;
1291
1292 for (i = 0; i < MD5_MAC_LEN; i++)
1293 *pos++ ^= hash[i];
1294
1295 len -= MD5_MAC_LEN;
1296 }
1297
1298 return 0;
1299 }
1300
1301
1302 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)1303 radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
1304 const u8 *secret, size_t secret_len)
1305 {
1306 u8 *key;
1307 size_t keylen;
1308 struct radius_ms_mppe_keys *keys;
1309
1310 if (msg == NULL || sent_msg == NULL)
1311 return NULL;
1312
1313 keys = os_zalloc(sizeof(*keys));
1314 if (keys == NULL)
1315 return NULL;
1316
1317 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1318 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY,
1319 &keylen);
1320 if (key) {
1321 keys->send = decrypt_ms_key(key, keylen,
1322 sent_msg->hdr->authenticator,
1323 secret, secret_len,
1324 &keys->send_len);
1325 if (!keys->send) {
1326 wpa_printf(MSG_DEBUG,
1327 "RADIUS: Failed to decrypt send key");
1328 }
1329 os_free(key);
1330 }
1331
1332 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1333 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY,
1334 &keylen);
1335 if (key) {
1336 keys->recv = decrypt_ms_key(key, keylen,
1337 sent_msg->hdr->authenticator,
1338 secret, secret_len,
1339 &keys->recv_len);
1340 if (!keys->recv) {
1341 wpa_printf(MSG_DEBUG,
1342 "RADIUS: Failed to decrypt recv key");
1343 }
1344 os_free(key);
1345 }
1346
1347 return keys;
1348 }
1349
1350
1351 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)1352 radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
1353 const u8 *secret, size_t secret_len)
1354 {
1355 u8 *key;
1356 size_t keylen;
1357 struct radius_ms_mppe_keys *keys;
1358
1359 if (msg == NULL || sent_msg == NULL)
1360 return NULL;
1361
1362 keys = os_zalloc(sizeof(*keys));
1363 if (keys == NULL)
1364 return NULL;
1365
1366 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO,
1367 RADIUS_CISCO_AV_PAIR, &keylen);
1368 if (key && keylen == 51 &&
1369 os_memcmp(key, "leap:session-key=", 17) == 0) {
1370 keys->recv = decrypt_ms_key(key + 17, keylen - 17,
1371 sent_msg->hdr->authenticator,
1372 secret, secret_len,
1373 &keys->recv_len);
1374 }
1375 os_free(key);
1376
1377 return keys;
1378 }
1379
1380
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)1381 int radius_msg_add_mppe_keys(struct radius_msg *msg,
1382 const u8 *req_authenticator,
1383 const u8 *secret, size_t secret_len,
1384 const u8 *send_key, size_t send_key_len,
1385 const u8 *recv_key, size_t recv_key_len)
1386 {
1387 struct radius_attr_hdr *attr;
1388 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT);
1389 u8 *buf;
1390 struct radius_attr_vendor *vhdr;
1391 u8 *pos;
1392 size_t elen;
1393 int hlen;
1394 u16 salt;
1395
1396 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2;
1397
1398 /* MS-MPPE-Send-Key */
1399 buf = os_malloc(hlen + send_key_len + 16);
1400 if (buf == NULL) {
1401 return 0;
1402 }
1403 pos = buf;
1404 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1405 pos += sizeof(vendor_id);
1406 vhdr = (struct radius_attr_vendor *) pos;
1407 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY;
1408 pos = (u8 *) (vhdr + 1);
1409 if (os_get_random((u8 *) &salt, sizeof(salt)) < 0) {
1410 os_free(buf);
1411 return 0;
1412 }
1413 salt |= 0x8000;
1414 WPA_PUT_BE16(pos, salt);
1415 pos += 2;
1416 if (encrypt_ms_key(send_key, send_key_len, salt, req_authenticator,
1417 secret, secret_len, pos, &elen) < 0)
1418 return 0;
1419 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1420
1421 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1422 buf, hlen + elen);
1423 os_free(buf);
1424 if (attr == NULL) {
1425 return 0;
1426 }
1427
1428 /* MS-MPPE-Recv-Key */
1429 buf = os_malloc(hlen + recv_key_len + 16);
1430 if (buf == NULL) {
1431 return 0;
1432 }
1433 pos = buf;
1434 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1435 pos += sizeof(vendor_id);
1436 vhdr = (struct radius_attr_vendor *) pos;
1437 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY;
1438 pos = (u8 *) (vhdr + 1);
1439 salt ^= 1;
1440 WPA_PUT_BE16(pos, salt);
1441 pos += 2;
1442 if (encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator,
1443 secret, secret_len, pos, &elen) < 0)
1444 return 0;
1445 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1446
1447 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1448 buf, hlen + elen);
1449 os_free(buf);
1450 if (attr == NULL) {
1451 return 0;
1452 }
1453
1454 return 1;
1455 }
1456
1457
radius_msg_add_wfa(struct radius_msg * msg,u8 subtype,const u8 * data,size_t len)1458 int radius_msg_add_wfa(struct radius_msg *msg, u8 subtype, const u8 *data,
1459 size_t len)
1460 {
1461 struct radius_attr_hdr *attr;
1462 u8 *buf, *pos;
1463 size_t alen;
1464
1465 alen = 4 + 2 + len;
1466 buf = os_malloc(alen);
1467 if (buf == NULL)
1468 return 0;
1469 pos = buf;
1470 WPA_PUT_BE32(pos, RADIUS_VENDOR_ID_WFA);
1471 pos += 4;
1472 *pos++ = subtype;
1473 *pos++ = 2 + len;
1474 os_memcpy(pos, data, len);
1475 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1476 buf, alen);
1477 os_free(buf);
1478 if (attr == NULL)
1479 return 0;
1480
1481 return 1;
1482 }
1483
1484
radius_msg_add_ext_vs(struct radius_msg * msg,u16 type,u32 vendor_id,u8 vendor_type,const u8 * data,size_t len)1485 int radius_msg_add_ext_vs(struct radius_msg *msg, u16 type, u32 vendor_id,
1486 u8 vendor_type, const u8 *data, size_t len)
1487 {
1488 struct radius_attr_hdr *attr;
1489 u8 *buf, *pos;
1490 size_t alen;
1491
1492 alen = 4 + 1 + len;
1493 buf = os_malloc(alen);
1494 if (!buf)
1495 return 0;
1496 pos = buf;
1497 WPA_PUT_BE32(pos, vendor_id);
1498 pos += 4;
1499 *pos++ = vendor_type;
1500 os_memcpy(pos, data, len);
1501 attr = radius_msg_add_attr(msg, type, buf, alen);
1502 os_free(buf);
1503 return attr != NULL;
1504 }
1505
1506
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)1507 int radius_user_password_hide(struct radius_msg *msg,
1508 const u8 *data, size_t data_len,
1509 const u8 *secret, size_t secret_len,
1510 u8 *buf, size_t buf_len)
1511 {
1512 size_t padlen, i, pos;
1513 const u8 *addr[2];
1514 size_t len[2];
1515 u8 hash[16];
1516
1517 if (data_len + 16 > buf_len)
1518 return -1;
1519
1520 os_memcpy(buf, data, data_len);
1521
1522 padlen = data_len % 16;
1523 if (padlen && data_len < buf_len) {
1524 padlen = 16 - padlen;
1525 os_memset(buf + data_len, 0, padlen);
1526 buf_len = data_len + padlen;
1527 } else {
1528 buf_len = data_len;
1529 }
1530
1531 addr[0] = secret;
1532 len[0] = secret_len;
1533 addr[1] = msg->hdr->authenticator;
1534 len[1] = 16;
1535 if (md5_vector(2, addr, len, hash) < 0) {
1536 wpa_printf(MSG_INFO, "RADIUS: MD5 not available");
1537 return -1;
1538 }
1539
1540 for (i = 0; i < 16; i++)
1541 buf[i] ^= hash[i];
1542 pos = 16;
1543
1544 while (pos < buf_len) {
1545 addr[0] = secret;
1546 len[0] = secret_len;
1547 addr[1] = &buf[pos - 16];
1548 len[1] = 16;
1549 if (md5_vector(2, addr, len, hash) < 0) {
1550 wpa_printf(MSG_INFO, "RADIUS: MD5 not available");
1551 return -1;
1552 }
1553
1554 for (i = 0; i < 16; i++)
1555 buf[pos + i] ^= hash[i];
1556
1557 pos += 16;
1558 }
1559
1560 return buf_len;
1561 }
1562
1563
1564 /* Add User-Password attribute to a RADIUS message and encrypt it as specified
1565 * in RFC 2865, Chap. 5.2 */
1566 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)1567 radius_msg_add_attr_user_password(struct radius_msg *msg,
1568 const u8 *data, size_t data_len,
1569 const u8 *secret, size_t secret_len)
1570 {
1571 u8 buf[128];
1572 int res;
1573
1574 res = radius_user_password_hide(msg, data, data_len,
1575 secret, secret_len, buf, sizeof(buf));
1576 if (res < 0)
1577 return NULL;
1578
1579 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD,
1580 buf, res);
1581 }
1582
1583
radius_msg_get_attr(struct radius_msg * msg,u8 type,u8 * buf,size_t len)1584 int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len)
1585 {
1586 struct radius_attr_hdr *attr = NULL, *tmp;
1587 size_t i, dlen;
1588
1589 for (i = 0; i < msg->attr_used; i++) {
1590 tmp = radius_get_attr_hdr(msg, i);
1591 if (tmp->type == type) {
1592 attr = tmp;
1593 break;
1594 }
1595 }
1596
1597 if (!attr || attr->length < sizeof(*attr))
1598 return -1;
1599
1600 dlen = attr->length - sizeof(*attr);
1601 if (buf)
1602 os_memcpy(buf, (attr + 1), dlen > len ? len : dlen);
1603 return dlen;
1604 }
1605
1606
radius_msg_get_attr_ptr(struct radius_msg * msg,u8 type,u8 ** buf,size_t * len,const u8 * start)1607 int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf,
1608 size_t *len, const u8 *start)
1609 {
1610 size_t i;
1611 struct radius_attr_hdr *attr = NULL, *tmp;
1612
1613 for (i = 0; i < msg->attr_used; i++) {
1614 tmp = radius_get_attr_hdr(msg, i);
1615 if (tmp->type == type &&
1616 (start == NULL || (u8 *) tmp > start)) {
1617 attr = tmp;
1618 break;
1619 }
1620 }
1621
1622 if (!attr || attr->length < sizeof(*attr))
1623 return -1;
1624
1625 *buf = (u8 *) (attr + 1);
1626 *len = attr->length - sizeof(*attr);
1627 return 0;
1628 }
1629
1630
radius_msg_count_attr(struct radius_msg * msg,u8 type,int min_len)1631 int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len)
1632 {
1633 size_t i;
1634 int count;
1635
1636 for (count = 0, i = 0; i < msg->attr_used; i++) {
1637 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
1638 if (attr->type == type &&
1639 attr->length >= sizeof(struct radius_attr_hdr) + min_len)
1640 count++;
1641 }
1642
1643 return count;
1644 }
1645
1646
1647 struct radius_tunnel_attrs {
1648 int tag_used;
1649 int type; /* Tunnel-Type */
1650 int medium_type; /* Tunnel-Medium-Type */
1651 int vlanid;
1652 };
1653
1654
cmp_int(const void * a,const void * b)1655 static int cmp_int(const void *a, const void *b)
1656 {
1657 int x, y;
1658
1659 x = *((int *) a);
1660 y = *((int *) b);
1661 return (x - y);
1662 }
1663
1664
1665 /**
1666 * radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information
1667 * The k tagged vlans found are sorted by vlan_id and stored in the first k
1668 * items of tagged.
1669 *
1670 * @msg: RADIUS message
1671 * @untagged: Pointer to store untagged vid
1672 * @numtagged: Size of tagged
1673 * @tagged: Pointer to store tagged list
1674 *
1675 * Returns: 0 if neither tagged nor untagged configuration is found, 1 otherwise
1676 */
radius_msg_get_vlanid(struct radius_msg * msg,int * untagged,int numtagged,int * tagged)1677 int radius_msg_get_vlanid(struct radius_msg *msg, int *untagged, int numtagged,
1678 int *tagged)
1679 {
1680 struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun;
1681 size_t i;
1682 struct radius_attr_hdr *attr = NULL;
1683 const u8 *data;
1684 char buf[10];
1685 size_t dlen;
1686 int j, taggedidx = 0, vlan_id;
1687
1688 os_memset(&tunnel, 0, sizeof(tunnel));
1689 for (j = 0; j < numtagged; j++)
1690 tagged[j] = 0;
1691 *untagged = 0;
1692
1693 for (i = 0; i < msg->attr_used; i++) {
1694 attr = radius_get_attr_hdr(msg, i);
1695 if (attr->length < sizeof(*attr))
1696 return -1;
1697 data = (const u8 *) (attr + 1);
1698 dlen = attr->length - sizeof(*attr);
1699 if (attr->length < 3)
1700 continue;
1701 if (data[0] >= RADIUS_TUNNEL_TAGS)
1702 tun = &tunnel[0];
1703 else
1704 tun = &tunnel[data[0]];
1705
1706 switch (attr->type) {
1707 case RADIUS_ATTR_TUNNEL_TYPE:
1708 if (attr->length != 6)
1709 break;
1710 tun->tag_used++;
1711 tun->type = WPA_GET_BE24(data + 1);
1712 break;
1713 case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE:
1714 if (attr->length != 6)
1715 break;
1716 tun->tag_used++;
1717 tun->medium_type = WPA_GET_BE24(data + 1);
1718 break;
1719 case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID:
1720 if (data[0] < RADIUS_TUNNEL_TAGS) {
1721 data++;
1722 dlen--;
1723 }
1724 if (dlen >= sizeof(buf))
1725 break;
1726 os_memcpy(buf, data, dlen);
1727 buf[dlen] = '\0';
1728 vlan_id = atoi(buf);
1729 if (vlan_id <= 0)
1730 break;
1731 tun->tag_used++;
1732 tun->vlanid = vlan_id;
1733 break;
1734 case RADIUS_ATTR_EGRESS_VLANID: /* RFC 4675 */
1735 if (attr->length != 6)
1736 break;
1737 vlan_id = WPA_GET_BE24(data + 1);
1738 if (vlan_id <= 0)
1739 break;
1740 if (data[0] == 0x32)
1741 *untagged = vlan_id;
1742 else if (data[0] == 0x31 && tagged &&
1743 taggedidx < numtagged)
1744 tagged[taggedidx++] = vlan_id;
1745 break;
1746 }
1747 }
1748
1749 /* Use tunnel with the lowest tag for untagged VLAN id */
1750 for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) {
1751 tun = &tunnel[i];
1752 if (tun->tag_used &&
1753 tun->type == RADIUS_TUNNEL_TYPE_VLAN &&
1754 tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 &&
1755 tun->vlanid > 0) {
1756 *untagged = tun->vlanid;
1757 break;
1758 }
1759 }
1760
1761 if (taggedidx)
1762 qsort(tagged, taggedidx, sizeof(int), cmp_int);
1763
1764 if (*untagged > 0 || taggedidx)
1765 return 1;
1766 return 0;
1767 }
1768
1769
1770 /**
1771 * radius_msg_get_tunnel_password - Parse RADIUS attribute Tunnel-Password
1772 * @msg: Received RADIUS message
1773 * @keylen: Length of returned password
1774 * @secret: RADIUS shared secret
1775 * @secret_len: Length of secret
1776 * @sent_msg: Sent RADIUS message
1777 * @n: Number of password attribute to return (starting with 0)
1778 * Returns: Pointer to n-th password (free with os_free) or %NULL
1779 */
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)1780 char * radius_msg_get_tunnel_password(struct radius_msg *msg, int *keylen,
1781 const u8 *secret, size_t secret_len,
1782 struct radius_msg *sent_msg, size_t n)
1783 {
1784 u8 *buf = NULL;
1785 size_t buflen;
1786 const u8 *salt;
1787 u8 *str;
1788 const u8 *addr[3];
1789 size_t len[3];
1790 u8 hash[16];
1791 u8 *pos;
1792 size_t i, j = 0;
1793 struct radius_attr_hdr *attr;
1794 const u8 *data;
1795 size_t dlen;
1796 const u8 *fdata = NULL; /* points to found item */
1797 size_t fdlen = -1;
1798 char *ret = NULL;
1799
1800 /* find n-th valid Tunnel-Password attribute */
1801 for (i = 0; i < msg->attr_used; i++) {
1802 attr = radius_get_attr_hdr(msg, i);
1803 if (attr == NULL ||
1804 attr->type != RADIUS_ATTR_TUNNEL_PASSWORD) {
1805 continue;
1806 }
1807 if (attr->length <= 5)
1808 continue;
1809 data = (const u8 *) (attr + 1);
1810 dlen = attr->length - sizeof(*attr);
1811 if (dlen <= 3 || dlen % 16 != 3)
1812 continue;
1813 j++;
1814 if (j <= n)
1815 continue;
1816
1817 fdata = data;
1818 fdlen = dlen;
1819 break;
1820 }
1821 if (fdata == NULL)
1822 goto out;
1823
1824 /* alloc writable memory for decryption */
1825 buf = os_memdup(fdata, fdlen);
1826 if (buf == NULL)
1827 goto out;
1828 buflen = fdlen;
1829
1830 /* init pointers */
1831 salt = buf + 1;
1832 str = buf + 3;
1833
1834 /* decrypt blocks */
1835 pos = buf + buflen - 16; /* last block */
1836 while (pos >= str + 16) { /* all but the first block */
1837 addr[0] = secret;
1838 len[0] = secret_len;
1839 addr[1] = pos - 16;
1840 len[1] = 16;
1841 if (md5_vector(2, addr, len, hash) < 0) {
1842 wpa_printf(MSG_INFO, "RADIUS: MD5 not available");
1843 goto out;
1844 }
1845
1846 for (i = 0; i < 16; i++)
1847 pos[i] ^= hash[i];
1848
1849 pos -= 16;
1850 }
1851
1852 /* decrypt first block */
1853 if (str != pos)
1854 goto out;
1855 addr[0] = secret;
1856 len[0] = secret_len;
1857 addr[1] = sent_msg->hdr->authenticator;
1858 len[1] = 16;
1859 addr[2] = salt;
1860 len[2] = 2;
1861 if (md5_vector(3, addr, len, hash) < 0) {
1862 wpa_printf(MSG_INFO, "RADIUS: MD5 not available");
1863 goto out;
1864 }
1865
1866 for (i = 0; i < 16; i++)
1867 pos[i] ^= hash[i];
1868
1869 /* derive plaintext length from first subfield */
1870 *keylen = (unsigned char) str[0];
1871 if ((u8 *) (str + *keylen) >= (u8 *) (buf + buflen)) {
1872 /* decryption error - invalid key length */
1873 goto out;
1874 }
1875 if (*keylen == 0) {
1876 /* empty password */
1877 goto out;
1878 }
1879
1880 /* copy passphrase into new buffer */
1881 ret = os_malloc(*keylen);
1882 if (ret)
1883 os_memcpy(ret, str + 1, *keylen);
1884
1885 out:
1886 /* return new buffer */
1887 os_free(buf);
1888 return ret;
1889 }
1890
1891
radius_free_class(struct radius_class_data * c)1892 void radius_free_class(struct radius_class_data *c)
1893 {
1894 size_t i;
1895 if (c == NULL)
1896 return;
1897 for (i = 0; i < c->count; i++)
1898 os_free(c->attr[i].data);
1899 os_free(c->attr);
1900 c->attr = NULL;
1901 c->count = 0;
1902 }
1903
1904
radius_copy_class(struct radius_class_data * dst,const struct radius_class_data * src)1905 int radius_copy_class(struct radius_class_data *dst,
1906 const struct radius_class_data *src)
1907 {
1908 size_t i;
1909
1910 if (src->attr == NULL)
1911 return 0;
1912
1913 dst->attr = os_calloc(src->count, sizeof(struct radius_attr_data));
1914 if (dst->attr == NULL)
1915 return -1;
1916
1917 dst->count = 0;
1918
1919 for (i = 0; i < src->count; i++) {
1920 dst->attr[i].data = os_memdup(src->attr[i].data,
1921 src->attr[i].len);
1922 if (dst->attr[i].data == NULL)
1923 break;
1924 dst->count++;
1925 dst->attr[i].len = src->attr[i].len;
1926 }
1927
1928 return 0;
1929 }
1930
1931
radius_msg_find_unlisted_attr(struct radius_msg * msg,u8 * attrs)1932 u8 radius_msg_find_unlisted_attr(struct radius_msg *msg, u8 *attrs)
1933 {
1934 size_t i, j;
1935 struct radius_attr_hdr *attr;
1936
1937 for (i = 0; i < msg->attr_used; i++) {
1938 attr = radius_get_attr_hdr(msg, i);
1939
1940 for (j = 0; attrs[j]; j++) {
1941 if (attr->type == attrs[j])
1942 break;
1943 }
1944
1945 if (attrs[j] == 0)
1946 return attr->type; /* unlisted attr */
1947 }
1948
1949 return 0;
1950 }
1951
1952
radius_gen_session_id(u8 * id,size_t len)1953 int radius_gen_session_id(u8 *id, size_t len)
1954 {
1955 /*
1956 * Acct-Session-Id and Acct-Multi-Session-Id should be globally and
1957 * temporarily unique. A high quality random number is required
1958 * therefore. This could be be improved by switching to a GUID.
1959 */
1960 return os_get_random(id, len);
1961 }
1962