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 return -1;
474 } else
475 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
476
477 if (wpabuf_len(msg->buf) > 0xffff) {
478 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
479 (unsigned long) wpabuf_len(msg->buf));
480 return -1;
481 }
482 return 0;
483 }
484
485
radius_msg_finish_srv(struct radius_msg * msg,const u8 * secret,size_t secret_len,const u8 * req_authenticator)486 int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret,
487 size_t secret_len, const u8 *req_authenticator)
488 {
489 const u8 *addr[4];
490 size_t len[4];
491 u8 *pos;
492
493 pos = radius_msg_auth_pos(msg);
494 if (!pos)
495 return -1;
496 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
497 os_memcpy(msg->hdr->authenticator, req_authenticator,
498 sizeof(msg->hdr->authenticator));
499 if (hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
500 wpabuf_len(msg->buf), pos) < 0)
501 return -1;
502
503 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
504 addr[0] = (u8 *) msg->hdr;
505 len[0] = 1 + 1 + 2;
506 addr[1] = req_authenticator;
507 len[1] = MD5_MAC_LEN;
508 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
509 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
510 addr[3] = secret;
511 len[3] = secret_len;
512 md5_vector(4, addr, len, msg->hdr->authenticator);
513
514 if (wpabuf_len(msg->buf) > 0xffff) {
515 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
516 (unsigned long) wpabuf_len(msg->buf));
517 return -1;
518 }
519 return 0;
520 }
521
522
radius_msg_finish_das_resp(struct radius_msg * msg,const u8 * secret,size_t secret_len,const struct radius_hdr * req_hdr)523 int radius_msg_finish_das_resp(struct radius_msg *msg, const u8 *secret,
524 size_t secret_len,
525 const struct radius_hdr *req_hdr)
526 {
527 const u8 *addr[2];
528 size_t len[2];
529 u8 *pos;
530
531 pos = radius_msg_auth_pos(msg);
532 if (!pos)
533 return -1;
534
535 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
536 os_memcpy(msg->hdr->authenticator, req_hdr->authenticator, 16);
537 if (hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
538 wpabuf_len(msg->buf), pos) < 0)
539 return -1;
540
541 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
542 addr[0] = wpabuf_head_u8(msg->buf);
543 len[0] = wpabuf_len(msg->buf);
544 addr[1] = secret;
545 len[1] = secret_len;
546 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0)
547 return -1;
548
549 if (wpabuf_len(msg->buf) > 0xffff) {
550 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
551 (unsigned long) wpabuf_len(msg->buf));
552 return -1;
553 }
554 return 0;
555 }
556
557
radius_msg_finish_acct(struct radius_msg * msg,const u8 * secret,size_t secret_len)558 void radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret,
559 size_t secret_len)
560 {
561 const u8 *addr[2];
562 size_t len[2];
563
564 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
565 os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN);
566 addr[0] = wpabuf_head(msg->buf);
567 len[0] = wpabuf_len(msg->buf);
568 addr[1] = secret;
569 len[1] = secret_len;
570 md5_vector(2, addr, len, msg->hdr->authenticator);
571
572 if (wpabuf_len(msg->buf) > 0xffff) {
573 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
574 (unsigned long) wpabuf_len(msg->buf));
575 }
576 }
577
578
radius_msg_finish_acct_resp(struct radius_msg * msg,const u8 * secret,size_t secret_len,const u8 * req_authenticator)579 void radius_msg_finish_acct_resp(struct radius_msg *msg, const u8 *secret,
580 size_t secret_len, const u8 *req_authenticator)
581 {
582 const u8 *addr[2];
583 size_t len[2];
584
585 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
586 os_memcpy(msg->hdr->authenticator, req_authenticator, MD5_MAC_LEN);
587 addr[0] = wpabuf_head(msg->buf);
588 len[0] = wpabuf_len(msg->buf);
589 addr[1] = secret;
590 len[1] = secret_len;
591 md5_vector(2, addr, len, msg->hdr->authenticator);
592
593 if (wpabuf_len(msg->buf) > 0xffff) {
594 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
595 (unsigned long) wpabuf_len(msg->buf));
596 }
597 }
598
599
radius_msg_verify_acct_req(struct radius_msg * msg,const u8 * secret,size_t secret_len)600 int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret,
601 size_t secret_len)
602 {
603 const u8 *addr[4];
604 size_t len[4];
605 u8 zero[MD5_MAC_LEN];
606 u8 hash[MD5_MAC_LEN];
607
608 os_memset(zero, 0, sizeof(zero));
609 addr[0] = (u8 *) msg->hdr;
610 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
611 addr[1] = zero;
612 len[1] = MD5_MAC_LEN;
613 addr[2] = (u8 *) (msg->hdr + 1);
614 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
615 addr[3] = secret;
616 len[3] = secret_len;
617 md5_vector(4, addr, len, hash);
618 return os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0;
619 }
620
621
radius_msg_verify_das_req(struct radius_msg * msg,const u8 * secret,size_t secret_len,int require_message_authenticator)622 int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret,
623 size_t secret_len,
624 int require_message_authenticator)
625 {
626 const u8 *addr[4];
627 size_t len[4];
628 u8 zero[MD5_MAC_LEN];
629 u8 hash[MD5_MAC_LEN];
630 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
631 u8 orig_authenticator[16];
632
633 struct radius_attr_hdr *attr = NULL, *tmp;
634 size_t i;
635
636 os_memset(zero, 0, sizeof(zero));
637 addr[0] = (u8 *) msg->hdr;
638 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
639 addr[1] = zero;
640 len[1] = MD5_MAC_LEN;
641 addr[2] = (u8 *) (msg->hdr + 1);
642 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
643 addr[3] = secret;
644 len[3] = secret_len;
645 md5_vector(4, addr, len, hash);
646 if (os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0)
647 return 1;
648
649 for (i = 0; i < msg->attr_used; i++) {
650 tmp = radius_get_attr_hdr(msg, i);
651 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
652 if (attr != NULL) {
653 wpa_printf(MSG_WARNING, "Multiple "
654 "Message-Authenticator attributes "
655 "in RADIUS message");
656 return 1;
657 }
658 attr = tmp;
659 }
660 }
661
662 if (attr == NULL) {
663 if (require_message_authenticator) {
664 wpa_printf(MSG_WARNING,
665 "Missing Message-Authenticator attribute in RADIUS message");
666 return 1;
667 }
668 return 0;
669 }
670
671 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
672 os_memset(attr + 1, 0, MD5_MAC_LEN);
673 os_memcpy(orig_authenticator, msg->hdr->authenticator,
674 sizeof(orig_authenticator));
675 os_memset(msg->hdr->authenticator, 0,
676 sizeof(msg->hdr->authenticator));
677 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
678 wpabuf_len(msg->buf), auth);
679 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
680 os_memcpy(msg->hdr->authenticator, orig_authenticator,
681 sizeof(orig_authenticator));
682
683 return os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0;
684 }
685
686
radius_msg_add_attr_to_array(struct radius_msg * msg,struct radius_attr_hdr * attr)687 static int radius_msg_add_attr_to_array(struct radius_msg *msg,
688 struct radius_attr_hdr *attr)
689 {
690 if (msg->attr_used >= msg->attr_size) {
691 size_t *nattr_pos;
692 size_t nlen = msg->attr_size * 2;
693
694 nattr_pos = os_realloc_array(msg->attr_pos, nlen,
695 sizeof(*msg->attr_pos));
696 if (nattr_pos == NULL)
697 return -1;
698
699 msg->attr_pos = nattr_pos;
700 msg->attr_size = nlen;
701 }
702
703 msg->attr_pos[msg->attr_used++] =
704 (unsigned char *) attr - wpabuf_head_u8(msg->buf);
705
706 return 0;
707 }
708
709
radius_msg_add_attr(struct radius_msg * msg,u16 type,const u8 * data,size_t data_len)710 struct radius_attr_hdr * radius_msg_add_attr(struct radius_msg *msg, u16 type,
711 const u8 *data, size_t data_len)
712 {
713 size_t buf_needed, max_len;
714 struct radius_attr_hdr *attr = NULL;
715 struct radius_attr_hdr_ext *ext;
716 u8 ext_type = 0;
717
718 if (TEST_FAIL())
719 return NULL;
720
721 if (type > 255) {
722 if (!radius_is_ext_type(type >> 8)) {
723 wpa_printf(MSG_ERROR,
724 "%s: Undefined extended type %d.%d",
725 __func__, type >> 8, type & 0xff);
726 return NULL;
727 }
728 ext_type = type & 0xff;
729 type >>= 8;
730 } else if (radius_is_ext_type(type)) {
731 wpa_printf(MSG_ERROR, "%s: Unexpected extended type use for %d",
732 __func__, type);
733 }
734
735 if (radius_is_long_ext_type(type)) {
736 size_t hdr_len = sizeof(struct radius_attr_hdr_ext) + 1;
737 size_t plen = 255 - hdr_len;
738 size_t num;
739
740 max_len = 4096;
741 num = (data_len + plen - 1) / plen;
742 if (num == 0)
743 num = 1;
744 buf_needed = num * hdr_len + data_len;
745 } else if (radius_is_ext_type(type)) {
746 max_len = RADIUS_MAX_EXT_ATTR_LEN;
747 buf_needed = sizeof(struct radius_attr_hdr_ext) + data_len;
748 } else {
749 max_len = RADIUS_MAX_ATTR_LEN;
750 buf_needed = sizeof(*attr) + data_len;
751 }
752 if (data_len > max_len) {
753 wpa_printf(MSG_ERROR,
754 "%s: too long attribute (%zu > %zu bytes)",
755 __func__, data_len, max_len);
756 return NULL;
757 }
758
759 if (wpabuf_tailroom(msg->buf) < buf_needed) {
760 /* allocate more space for message buffer */
761 if (wpabuf_resize(&msg->buf, buf_needed) < 0)
762 return NULL;
763 msg->hdr = wpabuf_mhead(msg->buf);
764 }
765
766 if (radius_is_long_ext_type(type)) {
767 size_t plen = 255 - sizeof(struct radius_attr_hdr_ext) - 1;
768 size_t alen;
769
770 do {
771 alen = data_len > plen ? plen : data_len;
772 ext = wpabuf_put(msg->buf,
773 sizeof(struct radius_attr_hdr_ext));
774 if (!attr)
775 attr = (struct radius_attr_hdr *) ext;
776 ext->type = type;
777 ext->length = sizeof(*ext) + 1 + alen;
778 ext->ext_type = ext_type;
779 wpabuf_put_u8(msg->buf, data_len > alen ? 0x80 : 0);
780 wpabuf_put_data(msg->buf, data, data_len);
781 data += alen;
782 data_len -= alen;
783 if (radius_msg_add_attr_to_array(
784 msg, (struct radius_attr_hdr *) ext))
785 return NULL;
786 } while (data_len > 0);
787 } else if (radius_is_ext_type(type)) {
788 ext = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr_ext));
789 attr = (struct radius_attr_hdr *) ext;
790 ext->type = type;
791 ext->length = sizeof(*ext) + data_len;
792 ext->ext_type = ext_type;
793 wpabuf_put_data(msg->buf, data, data_len);
794 if (radius_msg_add_attr_to_array(msg, attr))
795 return NULL;
796 } else {
797 attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr));
798 attr->type = type;
799 attr->length = sizeof(*attr) + data_len;
800 wpabuf_put_data(msg->buf, data, data_len);
801 if (radius_msg_add_attr_to_array(msg, attr))
802 return NULL;
803 }
804
805 return attr;
806 }
807
808
809 /**
810 * radius_msg_parse - Parse a RADIUS message
811 * @data: RADIUS message to be parsed
812 * @len: Length of data buffer in octets
813 * Returns: Parsed RADIUS message or %NULL on failure
814 *
815 * This parses a RADIUS message and makes a copy of its data. The caller is
816 * responsible for freeing the returned data with radius_msg_free().
817 */
radius_msg_parse(const u8 * data,size_t len)818 struct radius_msg * radius_msg_parse(const u8 *data, size_t len)
819 {
820 struct radius_msg *msg;
821 struct radius_hdr *hdr;
822 struct radius_attr_hdr *attr;
823 size_t msg_len;
824 unsigned char *pos, *end;
825
826 if (data == NULL || len < sizeof(*hdr))
827 return NULL;
828
829 hdr = (struct radius_hdr *) data;
830
831 msg_len = be_to_host16(hdr->length);
832 if (msg_len < sizeof(*hdr) || msg_len > len) {
833 wpa_printf(MSG_INFO, "RADIUS: Invalid message length");
834 return NULL;
835 }
836
837 if (msg_len < len) {
838 wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after "
839 "RADIUS message", (unsigned long) len - msg_len);
840 }
841
842 msg = os_zalloc(sizeof(*msg));
843 if (msg == NULL)
844 return NULL;
845
846 msg->buf = wpabuf_alloc_copy(data, msg_len);
847 if (msg->buf == NULL || radius_msg_initialize(msg)) {
848 radius_msg_free(msg);
849 return NULL;
850 }
851 msg->hdr = wpabuf_mhead(msg->buf);
852
853 /* parse attributes */
854 pos = wpabuf_mhead_u8(msg->buf) + sizeof(struct radius_hdr);
855 end = wpabuf_mhead_u8(msg->buf) + wpabuf_len(msg->buf);
856 while (pos < end) {
857 if ((size_t) (end - pos) < sizeof(*attr))
858 goto fail;
859
860 attr = (struct radius_attr_hdr *) pos;
861
862 if (attr->length > end - pos || attr->length < sizeof(*attr))
863 goto fail;
864
865 /* TODO: check that attr->length is suitable for attr->type */
866
867 if (radius_msg_add_attr_to_array(msg, attr))
868 goto fail;
869
870 pos += attr->length;
871 }
872
873 return msg;
874
875 fail:
876 radius_msg_free(msg);
877 return NULL;
878 }
879
880
radius_msg_add_eap(struct radius_msg * msg,const u8 * data,size_t data_len)881 int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len)
882 {
883 const u8 *pos = data;
884 size_t left = data_len;
885
886 while (left > 0) {
887 int len;
888 if (left > RADIUS_MAX_ATTR_LEN)
889 len = RADIUS_MAX_ATTR_LEN;
890 else
891 len = left;
892
893 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE,
894 pos, len))
895 return 0;
896
897 pos += len;
898 left -= len;
899 }
900
901 return 1;
902 }
903
904
radius_msg_get_eap(struct radius_msg * msg)905 struct wpabuf * radius_msg_get_eap(struct radius_msg *msg)
906 {
907 struct wpabuf *eap;
908 size_t len, i;
909 struct radius_attr_hdr *attr;
910
911 if (msg == NULL)
912 return NULL;
913
914 len = 0;
915 for (i = 0; i < msg->attr_used; i++) {
916 attr = radius_get_attr_hdr(msg, i);
917 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
918 attr->length > sizeof(struct radius_attr_hdr))
919 len += attr->length - sizeof(struct radius_attr_hdr);
920 }
921
922 if (len == 0)
923 return NULL;
924
925 eap = wpabuf_alloc(len);
926 if (eap == NULL)
927 return NULL;
928
929 for (i = 0; i < msg->attr_used; i++) {
930 attr = radius_get_attr_hdr(msg, i);
931 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
932 attr->length > sizeof(struct radius_attr_hdr)) {
933 int flen = attr->length - sizeof(*attr);
934 wpabuf_put_data(eap, attr + 1, flen);
935 }
936 }
937
938 return eap;
939 }
940
941
radius_msg_verify_msg_auth(struct radius_msg * msg,const u8 * secret,size_t secret_len,const u8 * req_auth)942 int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret,
943 size_t secret_len, const u8 *req_auth)
944 {
945 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
946 u8 orig_authenticator[16];
947 struct radius_attr_hdr *attr = NULL, *tmp;
948 size_t i;
949
950 for (i = 0; i < msg->attr_used; i++) {
951 tmp = radius_get_attr_hdr(msg, i);
952 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
953 if (attr != NULL) {
954 wpa_printf(MSG_INFO, "Multiple Message-Authenticator attributes in RADIUS message");
955 return 1;
956 }
957 attr = tmp;
958 }
959 }
960
961 if (attr == NULL) {
962 wpa_printf(MSG_INFO, "No Message-Authenticator attribute found");
963 return 1;
964 }
965
966 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
967 os_memset(attr + 1, 0, MD5_MAC_LEN);
968 if (req_auth) {
969 os_memcpy(orig_authenticator, msg->hdr->authenticator,
970 sizeof(orig_authenticator));
971 os_memcpy(msg->hdr->authenticator, req_auth,
972 sizeof(msg->hdr->authenticator));
973 }
974 if (hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
975 wpabuf_len(msg->buf), auth) < 0)
976 return 1;
977 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
978 if (req_auth) {
979 os_memcpy(msg->hdr->authenticator, orig_authenticator,
980 sizeof(orig_authenticator));
981 }
982
983 if (os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0) {
984 wpa_printf(MSG_INFO, "Invalid Message-Authenticator!");
985 return 1;
986 }
987
988 return 0;
989 }
990
991
radius_msg_verify(struct radius_msg * msg,const u8 * secret,size_t secret_len,struct radius_msg * sent_msg,int auth)992 int radius_msg_verify(struct radius_msg *msg, const u8 *secret,
993 size_t secret_len, struct radius_msg *sent_msg, int auth)
994 {
995 const u8 *addr[4];
996 size_t len[4];
997 u8 hash[MD5_MAC_LEN];
998
999 if (sent_msg == NULL) {
1000 wpa_printf(MSG_INFO, "No matching Access-Request message found");
1001 return 1;
1002 }
1003
1004 if (!auth) {
1005 u8 *pos;
1006 size_t alen;
1007
1008 if (radius_msg_get_attr_ptr(msg,
1009 RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
1010 &pos, &alen, NULL) == 0) {
1011 /* Check the Message-Authenticator attribute since it
1012 * was included even if we are configured to not
1013 * require it. */
1014 auth = 1;
1015 }
1016 }
1017
1018 if (auth &&
1019 radius_msg_verify_msg_auth(msg, secret, secret_len,
1020 sent_msg->hdr->authenticator)) {
1021 return 1;
1022 }
1023
1024 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
1025 addr[0] = (u8 *) msg->hdr;
1026 len[0] = 1 + 1 + 2;
1027 addr[1] = sent_msg->hdr->authenticator;
1028 len[1] = MD5_MAC_LEN;
1029 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
1030 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
1031 addr[3] = secret;
1032 len[3] = secret_len;
1033 if (md5_vector(4, addr, len, hash) < 0 ||
1034 os_memcmp_const(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) {
1035 wpa_printf(MSG_INFO, "Response Authenticator invalid!");
1036 return 1;
1037 }
1038
1039 return 0;
1040 }
1041
1042
radius_msg_copy_attr(struct radius_msg * dst,struct radius_msg * src,u8 type)1043 int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src,
1044 u8 type)
1045 {
1046 struct radius_attr_hdr *attr;
1047 size_t i;
1048 int count = 0;
1049
1050 for (i = 0; i < src->attr_used; i++) {
1051 attr = radius_get_attr_hdr(src, i);
1052 if (attr->type == type && attr->length >= sizeof(*attr)) {
1053 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1),
1054 attr->length - sizeof(*attr)))
1055 return -1;
1056 count++;
1057 }
1058 }
1059
1060 return count;
1061 }
1062
1063
1064 /* Create Request Authenticator. The value should be unique over the lifetime
1065 * of the shared secret between authenticator and authentication server.
1066 */
radius_msg_make_authenticator(struct radius_msg * msg)1067 int radius_msg_make_authenticator(struct radius_msg *msg)
1068 {
1069 return os_get_random((u8 *) &msg->hdr->authenticator,
1070 sizeof(msg->hdr->authenticator));
1071 }
1072
1073
1074 /* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message.
1075 * Returns the Attribute payload and sets alen to indicate the length of the
1076 * payload if a vendor attribute with subtype is found, otherwise returns NULL.
1077 * The returned payload is allocated with os_malloc() and caller must free it
1078 * by calling os_free().
1079 */
radius_msg_get_vendor_attr(struct radius_msg * msg,u32 vendor,u8 subtype,size_t * alen)1080 static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor,
1081 u8 subtype, size_t *alen)
1082 {
1083 u8 *data, *pos;
1084 size_t i, len;
1085
1086 if (msg == NULL)
1087 return NULL;
1088
1089 for (i = 0; i < msg->attr_used; i++) {
1090 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
1091 size_t left;
1092 u32 vendor_id;
1093 struct radius_attr_vendor *vhdr;
1094
1095 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC ||
1096 attr->length < sizeof(*attr))
1097 continue;
1098
1099 left = attr->length - sizeof(*attr);
1100 if (left < 4)
1101 continue;
1102
1103 pos = (u8 *) (attr + 1);
1104
1105 os_memcpy(&vendor_id, pos, 4);
1106 pos += 4;
1107 left -= 4;
1108
1109 if (ntohl(vendor_id) != vendor)
1110 continue;
1111
1112 while (left >= sizeof(*vhdr)) {
1113 vhdr = (struct radius_attr_vendor *) pos;
1114 if (vhdr->vendor_length > left ||
1115 vhdr->vendor_length < sizeof(*vhdr)) {
1116 break;
1117 }
1118 if (vhdr->vendor_type != subtype) {
1119 pos += vhdr->vendor_length;
1120 left -= vhdr->vendor_length;
1121 continue;
1122 }
1123
1124 len = vhdr->vendor_length - sizeof(*vhdr);
1125 data = os_memdup(pos + sizeof(*vhdr), len);
1126 if (data == NULL)
1127 return NULL;
1128 if (alen)
1129 *alen = len;
1130 return data;
1131 }
1132 }
1133
1134 return NULL;
1135 }
1136
1137
decrypt_ms_key(const u8 * key,size_t len,const u8 * req_authenticator,const u8 * secret,size_t secret_len,size_t * reslen)1138 static u8 * decrypt_ms_key(const u8 *key, size_t len,
1139 const u8 *req_authenticator,
1140 const u8 *secret, size_t secret_len, size_t *reslen)
1141 {
1142 u8 *plain, *ppos, *res;
1143 const u8 *pos;
1144 size_t left, plen;
1145 u8 hash[MD5_MAC_LEN];
1146 int i, first = 1;
1147 const u8 *addr[3];
1148 size_t elen[3];
1149
1150 /* key: 16-bit salt followed by encrypted key info */
1151
1152 if (len < 2 + 16) {
1153 wpa_printf(MSG_DEBUG, "RADIUS: %s: Len is too small: %d",
1154 __func__, (int) len);
1155 return NULL;
1156 }
1157
1158 pos = key + 2;
1159 left = len - 2;
1160 if (left % 16) {
1161 wpa_printf(MSG_INFO, "RADIUS: Invalid ms key len %lu",
1162 (unsigned long) left);
1163 return NULL;
1164 }
1165
1166 plen = left;
1167 ppos = plain = os_malloc(plen);
1168 if (plain == NULL)
1169 return NULL;
1170 plain[0] = 0;
1171
1172 while (left > 0) {
1173 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1174 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1175
1176 addr[0] = secret;
1177 elen[0] = secret_len;
1178 if (first) {
1179 addr[1] = req_authenticator;
1180 elen[1] = MD5_MAC_LEN;
1181 addr[2] = key;
1182 elen[2] = 2; /* Salt */
1183 } else {
1184 addr[1] = pos - MD5_MAC_LEN;
1185 elen[1] = MD5_MAC_LEN;
1186 }
1187 if (md5_vector(first ? 3 : 2, addr, elen, hash) < 0) {
1188 os_free(plain);
1189 return NULL;
1190 }
1191 first = 0;
1192
1193 for (i = 0; i < MD5_MAC_LEN; i++)
1194 *ppos++ = *pos++ ^ hash[i];
1195 left -= MD5_MAC_LEN;
1196 }
1197
1198 if (plain[0] == 0 || plain[0] > plen - 1) {
1199 wpa_printf(MSG_INFO, "RADIUS: Failed to decrypt MPPE key");
1200 os_free(plain);
1201 return NULL;
1202 }
1203
1204 res = os_memdup(plain + 1, plain[0]);
1205 if (res == NULL) {
1206 os_free(plain);
1207 return NULL;
1208 }
1209 if (reslen)
1210 *reslen = plain[0];
1211 os_free(plain);
1212 return res;
1213 }
1214
1215
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)1216 static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt,
1217 const u8 *req_authenticator,
1218 const u8 *secret, size_t secret_len,
1219 u8 *ebuf, size_t *elen)
1220 {
1221 int i, len, first = 1;
1222 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos;
1223 const u8 *addr[3];
1224 size_t _len[3];
1225
1226 WPA_PUT_BE16(saltbuf, salt);
1227
1228 len = 1 + key_len;
1229 if (len & 0x0f) {
1230 len = (len & 0xf0) + 16;
1231 }
1232 os_memset(ebuf, 0, len);
1233 ebuf[0] = key_len;
1234 os_memcpy(ebuf + 1, key, key_len);
1235
1236 *elen = len;
1237
1238 pos = ebuf;
1239 while (len > 0) {
1240 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1241 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1242 addr[0] = secret;
1243 _len[0] = secret_len;
1244 if (first) {
1245 addr[1] = req_authenticator;
1246 _len[1] = MD5_MAC_LEN;
1247 addr[2] = saltbuf;
1248 _len[2] = sizeof(saltbuf);
1249 } else {
1250 addr[1] = pos - MD5_MAC_LEN;
1251 _len[1] = MD5_MAC_LEN;
1252 }
1253 md5_vector(first ? 3 : 2, addr, _len, hash);
1254 first = 0;
1255
1256 for (i = 0; i < MD5_MAC_LEN; i++)
1257 *pos++ ^= hash[i];
1258
1259 len -= MD5_MAC_LEN;
1260 }
1261 }
1262
1263
1264 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)1265 radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
1266 const u8 *secret, size_t secret_len)
1267 {
1268 u8 *key;
1269 size_t keylen;
1270 struct radius_ms_mppe_keys *keys;
1271
1272 if (msg == NULL || sent_msg == NULL)
1273 return NULL;
1274
1275 keys = os_zalloc(sizeof(*keys));
1276 if (keys == NULL)
1277 return NULL;
1278
1279 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1280 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY,
1281 &keylen);
1282 if (key) {
1283 keys->send = decrypt_ms_key(key, keylen,
1284 sent_msg->hdr->authenticator,
1285 secret, secret_len,
1286 &keys->send_len);
1287 if (!keys->send) {
1288 wpa_printf(MSG_DEBUG,
1289 "RADIUS: Failed to decrypt send key");
1290 }
1291 os_free(key);
1292 }
1293
1294 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1295 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY,
1296 &keylen);
1297 if (key) {
1298 keys->recv = decrypt_ms_key(key, keylen,
1299 sent_msg->hdr->authenticator,
1300 secret, secret_len,
1301 &keys->recv_len);
1302 if (!keys->recv) {
1303 wpa_printf(MSG_DEBUG,
1304 "RADIUS: Failed to decrypt recv key");
1305 }
1306 os_free(key);
1307 }
1308
1309 return keys;
1310 }
1311
1312
1313 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)1314 radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
1315 const u8 *secret, size_t secret_len)
1316 {
1317 u8 *key;
1318 size_t keylen;
1319 struct radius_ms_mppe_keys *keys;
1320
1321 if (msg == NULL || sent_msg == NULL)
1322 return NULL;
1323
1324 keys = os_zalloc(sizeof(*keys));
1325 if (keys == NULL)
1326 return NULL;
1327
1328 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO,
1329 RADIUS_CISCO_AV_PAIR, &keylen);
1330 if (key && keylen == 51 &&
1331 os_memcmp(key, "leap:session-key=", 17) == 0) {
1332 keys->recv = decrypt_ms_key(key + 17, keylen - 17,
1333 sent_msg->hdr->authenticator,
1334 secret, secret_len,
1335 &keys->recv_len);
1336 }
1337 os_free(key);
1338
1339 return keys;
1340 }
1341
1342
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)1343 int radius_msg_add_mppe_keys(struct radius_msg *msg,
1344 const u8 *req_authenticator,
1345 const u8 *secret, size_t secret_len,
1346 const u8 *send_key, size_t send_key_len,
1347 const u8 *recv_key, size_t recv_key_len)
1348 {
1349 struct radius_attr_hdr *attr;
1350 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT);
1351 u8 *buf;
1352 struct radius_attr_vendor *vhdr;
1353 u8 *pos;
1354 size_t elen;
1355 int hlen;
1356 u16 salt;
1357
1358 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2;
1359
1360 /* MS-MPPE-Send-Key */
1361 buf = os_malloc(hlen + send_key_len + 16);
1362 if (buf == NULL) {
1363 return 0;
1364 }
1365 pos = buf;
1366 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1367 pos += sizeof(vendor_id);
1368 vhdr = (struct radius_attr_vendor *) pos;
1369 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY;
1370 pos = (u8 *) (vhdr + 1);
1371 if (os_get_random((u8 *) &salt, sizeof(salt)) < 0) {
1372 os_free(buf);
1373 return 0;
1374 }
1375 salt |= 0x8000;
1376 WPA_PUT_BE16(pos, salt);
1377 pos += 2;
1378 encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret,
1379 secret_len, pos, &elen);
1380 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1381
1382 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1383 buf, hlen + elen);
1384 os_free(buf);
1385 if (attr == NULL) {
1386 return 0;
1387 }
1388
1389 /* MS-MPPE-Recv-Key */
1390 buf = os_malloc(hlen + recv_key_len + 16);
1391 if (buf == NULL) {
1392 return 0;
1393 }
1394 pos = buf;
1395 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1396 pos += sizeof(vendor_id);
1397 vhdr = (struct radius_attr_vendor *) pos;
1398 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY;
1399 pos = (u8 *) (vhdr + 1);
1400 salt ^= 1;
1401 WPA_PUT_BE16(pos, salt);
1402 pos += 2;
1403 encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret,
1404 secret_len, pos, &elen);
1405 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1406
1407 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1408 buf, hlen + elen);
1409 os_free(buf);
1410 if (attr == NULL) {
1411 return 0;
1412 }
1413
1414 return 1;
1415 }
1416
1417
radius_msg_add_wfa(struct radius_msg * msg,u8 subtype,const u8 * data,size_t len)1418 int radius_msg_add_wfa(struct radius_msg *msg, u8 subtype, const u8 *data,
1419 size_t len)
1420 {
1421 struct radius_attr_hdr *attr;
1422 u8 *buf, *pos;
1423 size_t alen;
1424
1425 alen = 4 + 2 + len;
1426 buf = os_malloc(alen);
1427 if (buf == NULL)
1428 return 0;
1429 pos = buf;
1430 WPA_PUT_BE32(pos, RADIUS_VENDOR_ID_WFA);
1431 pos += 4;
1432 *pos++ = subtype;
1433 *pos++ = 2 + len;
1434 os_memcpy(pos, data, len);
1435 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1436 buf, alen);
1437 os_free(buf);
1438 if (attr == NULL)
1439 return 0;
1440
1441 return 1;
1442 }
1443
1444
radius_msg_add_ext_vs(struct radius_msg * msg,u16 type,u32 vendor_id,u8 vendor_type,const u8 * data,size_t len)1445 int radius_msg_add_ext_vs(struct radius_msg *msg, u16 type, u32 vendor_id,
1446 u8 vendor_type, const u8 *data, size_t len)
1447 {
1448 struct radius_attr_hdr *attr;
1449 u8 *buf, *pos;
1450 size_t alen;
1451
1452 alen = 4 + 1 + len;
1453 buf = os_malloc(alen);
1454 if (!buf)
1455 return 0;
1456 pos = buf;
1457 WPA_PUT_BE32(pos, vendor_id);
1458 pos += 4;
1459 *pos++ = vendor_type;
1460 os_memcpy(pos, data, len);
1461 attr = radius_msg_add_attr(msg, type, buf, alen);
1462 os_free(buf);
1463 return attr != NULL;
1464 }
1465
1466
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)1467 int radius_user_password_hide(struct radius_msg *msg,
1468 const u8 *data, size_t data_len,
1469 const u8 *secret, size_t secret_len,
1470 u8 *buf, size_t buf_len)
1471 {
1472 size_t padlen, i, pos;
1473 const u8 *addr[2];
1474 size_t len[2];
1475 u8 hash[16];
1476
1477 if (data_len + 16 > buf_len)
1478 return -1;
1479
1480 os_memcpy(buf, data, data_len);
1481
1482 padlen = data_len % 16;
1483 if (padlen && data_len < buf_len) {
1484 padlen = 16 - padlen;
1485 os_memset(buf + data_len, 0, padlen);
1486 buf_len = data_len + padlen;
1487 } else {
1488 buf_len = data_len;
1489 }
1490
1491 addr[0] = secret;
1492 len[0] = secret_len;
1493 addr[1] = msg->hdr->authenticator;
1494 len[1] = 16;
1495 md5_vector(2, addr, len, hash);
1496
1497 for (i = 0; i < 16; i++)
1498 buf[i] ^= hash[i];
1499 pos = 16;
1500
1501 while (pos < buf_len) {
1502 addr[0] = secret;
1503 len[0] = secret_len;
1504 addr[1] = &buf[pos - 16];
1505 len[1] = 16;
1506 md5_vector(2, addr, len, hash);
1507
1508 for (i = 0; i < 16; i++)
1509 buf[pos + i] ^= hash[i];
1510
1511 pos += 16;
1512 }
1513
1514 return buf_len;
1515 }
1516
1517
1518 /* Add User-Password attribute to a RADIUS message and encrypt it as specified
1519 * in RFC 2865, Chap. 5.2 */
1520 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)1521 radius_msg_add_attr_user_password(struct radius_msg *msg,
1522 const u8 *data, size_t data_len,
1523 const u8 *secret, size_t secret_len)
1524 {
1525 u8 buf[128];
1526 int res;
1527
1528 res = radius_user_password_hide(msg, data, data_len,
1529 secret, secret_len, buf, sizeof(buf));
1530 if (res < 0)
1531 return NULL;
1532
1533 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD,
1534 buf, res);
1535 }
1536
1537
radius_msg_get_attr(struct radius_msg * msg,u8 type,u8 * buf,size_t len)1538 int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len)
1539 {
1540 struct radius_attr_hdr *attr = NULL, *tmp;
1541 size_t i, dlen;
1542
1543 for (i = 0; i < msg->attr_used; i++) {
1544 tmp = radius_get_attr_hdr(msg, i);
1545 if (tmp->type == type) {
1546 attr = tmp;
1547 break;
1548 }
1549 }
1550
1551 if (!attr || attr->length < sizeof(*attr))
1552 return -1;
1553
1554 dlen = attr->length - sizeof(*attr);
1555 if (buf)
1556 os_memcpy(buf, (attr + 1), dlen > len ? len : dlen);
1557 return dlen;
1558 }
1559
1560
radius_msg_get_attr_ptr(struct radius_msg * msg,u8 type,u8 ** buf,size_t * len,const u8 * start)1561 int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf,
1562 size_t *len, const u8 *start)
1563 {
1564 size_t i;
1565 struct radius_attr_hdr *attr = NULL, *tmp;
1566
1567 for (i = 0; i < msg->attr_used; i++) {
1568 tmp = radius_get_attr_hdr(msg, i);
1569 if (tmp->type == type &&
1570 (start == NULL || (u8 *) tmp > start)) {
1571 attr = tmp;
1572 break;
1573 }
1574 }
1575
1576 if (!attr || attr->length < sizeof(*attr))
1577 return -1;
1578
1579 *buf = (u8 *) (attr + 1);
1580 *len = attr->length - sizeof(*attr);
1581 return 0;
1582 }
1583
1584
radius_msg_count_attr(struct radius_msg * msg,u8 type,int min_len)1585 int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len)
1586 {
1587 size_t i;
1588 int count;
1589
1590 for (count = 0, i = 0; i < msg->attr_used; i++) {
1591 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
1592 if (attr->type == type &&
1593 attr->length >= sizeof(struct radius_attr_hdr) + min_len)
1594 count++;
1595 }
1596
1597 return count;
1598 }
1599
1600
1601 struct radius_tunnel_attrs {
1602 int tag_used;
1603 int type; /* Tunnel-Type */
1604 int medium_type; /* Tunnel-Medium-Type */
1605 int vlanid;
1606 };
1607
1608
cmp_int(const void * a,const void * b)1609 static int cmp_int(const void *a, const void *b)
1610 {
1611 int x, y;
1612
1613 x = *((int *) a);
1614 y = *((int *) b);
1615 return (x - y);
1616 }
1617
1618
1619 /**
1620 * radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information
1621 * The k tagged vlans found are sorted by vlan_id and stored in the first k
1622 * items of tagged.
1623 *
1624 * @msg: RADIUS message
1625 * @untagged: Pointer to store untagged vid
1626 * @numtagged: Size of tagged
1627 * @tagged: Pointer to store tagged list
1628 *
1629 * Returns: 0 if neither tagged nor untagged configuration is found, 1 otherwise
1630 */
radius_msg_get_vlanid(struct radius_msg * msg,int * untagged,int numtagged,int * tagged)1631 int radius_msg_get_vlanid(struct radius_msg *msg, int *untagged, int numtagged,
1632 int *tagged)
1633 {
1634 struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun;
1635 size_t i;
1636 struct radius_attr_hdr *attr = NULL;
1637 const u8 *data;
1638 char buf[10];
1639 size_t dlen;
1640 int j, taggedidx = 0, vlan_id;
1641
1642 os_memset(&tunnel, 0, sizeof(tunnel));
1643 for (j = 0; j < numtagged; j++)
1644 tagged[j] = 0;
1645 *untagged = 0;
1646
1647 for (i = 0; i < msg->attr_used; i++) {
1648 attr = radius_get_attr_hdr(msg, i);
1649 if (attr->length < sizeof(*attr))
1650 return -1;
1651 data = (const u8 *) (attr + 1);
1652 dlen = attr->length - sizeof(*attr);
1653 if (attr->length < 3)
1654 continue;
1655 if (data[0] >= RADIUS_TUNNEL_TAGS)
1656 tun = &tunnel[0];
1657 else
1658 tun = &tunnel[data[0]];
1659
1660 switch (attr->type) {
1661 case RADIUS_ATTR_TUNNEL_TYPE:
1662 if (attr->length != 6)
1663 break;
1664 tun->tag_used++;
1665 tun->type = WPA_GET_BE24(data + 1);
1666 break;
1667 case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE:
1668 if (attr->length != 6)
1669 break;
1670 tun->tag_used++;
1671 tun->medium_type = WPA_GET_BE24(data + 1);
1672 break;
1673 case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID:
1674 if (data[0] < RADIUS_TUNNEL_TAGS) {
1675 data++;
1676 dlen--;
1677 }
1678 if (dlen >= sizeof(buf))
1679 break;
1680 os_memcpy(buf, data, dlen);
1681 buf[dlen] = '\0';
1682 vlan_id = atoi(buf);
1683 if (vlan_id <= 0)
1684 break;
1685 tun->tag_used++;
1686 tun->vlanid = vlan_id;
1687 break;
1688 case RADIUS_ATTR_EGRESS_VLANID: /* RFC 4675 */
1689 if (attr->length != 6)
1690 break;
1691 vlan_id = WPA_GET_BE24(data + 1);
1692 if (vlan_id <= 0)
1693 break;
1694 if (data[0] == 0x32)
1695 *untagged = vlan_id;
1696 else if (data[0] == 0x31 && tagged &&
1697 taggedidx < numtagged)
1698 tagged[taggedidx++] = vlan_id;
1699 break;
1700 }
1701 }
1702
1703 /* Use tunnel with the lowest tag for untagged VLAN id */
1704 for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) {
1705 tun = &tunnel[i];
1706 if (tun->tag_used &&
1707 tun->type == RADIUS_TUNNEL_TYPE_VLAN &&
1708 tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 &&
1709 tun->vlanid > 0) {
1710 *untagged = tun->vlanid;
1711 break;
1712 }
1713 }
1714
1715 if (taggedidx)
1716 qsort(tagged, taggedidx, sizeof(int), cmp_int);
1717
1718 if (*untagged > 0 || taggedidx)
1719 return 1;
1720 return 0;
1721 }
1722
1723
1724 /**
1725 * radius_msg_get_tunnel_password - Parse RADIUS attribute Tunnel-Password
1726 * @msg: Received RADIUS message
1727 * @keylen: Length of returned password
1728 * @secret: RADIUS shared secret
1729 * @secret_len: Length of secret
1730 * @sent_msg: Sent RADIUS message
1731 * @n: Number of password attribute to return (starting with 0)
1732 * Returns: Pointer to n-th password (free with os_free) or %NULL
1733 */
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)1734 char * radius_msg_get_tunnel_password(struct radius_msg *msg, int *keylen,
1735 const u8 *secret, size_t secret_len,
1736 struct radius_msg *sent_msg, size_t n)
1737 {
1738 u8 *buf = NULL;
1739 size_t buflen;
1740 const u8 *salt;
1741 u8 *str;
1742 const u8 *addr[3];
1743 size_t len[3];
1744 u8 hash[16];
1745 u8 *pos;
1746 size_t i, j = 0;
1747 struct radius_attr_hdr *attr;
1748 const u8 *data;
1749 size_t dlen;
1750 const u8 *fdata = NULL; /* points to found item */
1751 size_t fdlen = -1;
1752 char *ret = NULL;
1753
1754 /* find n-th valid Tunnel-Password attribute */
1755 for (i = 0; i < msg->attr_used; i++) {
1756 attr = radius_get_attr_hdr(msg, i);
1757 if (attr == NULL ||
1758 attr->type != RADIUS_ATTR_TUNNEL_PASSWORD) {
1759 continue;
1760 }
1761 if (attr->length <= 5)
1762 continue;
1763 data = (const u8 *) (attr + 1);
1764 dlen = attr->length - sizeof(*attr);
1765 if (dlen <= 3 || dlen % 16 != 3)
1766 continue;
1767 j++;
1768 if (j <= n)
1769 continue;
1770
1771 fdata = data;
1772 fdlen = dlen;
1773 break;
1774 }
1775 if (fdata == NULL)
1776 goto out;
1777
1778 /* alloc writable memory for decryption */
1779 buf = os_memdup(fdata, fdlen);
1780 if (buf == NULL)
1781 goto out;
1782 buflen = fdlen;
1783
1784 /* init pointers */
1785 salt = buf + 1;
1786 str = buf + 3;
1787
1788 /* decrypt blocks */
1789 pos = buf + buflen - 16; /* last block */
1790 while (pos >= str + 16) { /* all but the first block */
1791 addr[0] = secret;
1792 len[0] = secret_len;
1793 addr[1] = pos - 16;
1794 len[1] = 16;
1795 md5_vector(2, addr, len, hash);
1796
1797 for (i = 0; i < 16; i++)
1798 pos[i] ^= hash[i];
1799
1800 pos -= 16;
1801 }
1802
1803 /* decrypt first block */
1804 if (str != pos)
1805 goto out;
1806 addr[0] = secret;
1807 len[0] = secret_len;
1808 addr[1] = sent_msg->hdr->authenticator;
1809 len[1] = 16;
1810 addr[2] = salt;
1811 len[2] = 2;
1812 md5_vector(3, addr, len, hash);
1813
1814 for (i = 0; i < 16; i++)
1815 pos[i] ^= hash[i];
1816
1817 /* derive plaintext length from first subfield */
1818 *keylen = (unsigned char) str[0];
1819 if ((u8 *) (str + *keylen) >= (u8 *) (buf + buflen)) {
1820 /* decryption error - invalid key length */
1821 goto out;
1822 }
1823 if (*keylen == 0) {
1824 /* empty password */
1825 goto out;
1826 }
1827
1828 /* copy passphrase into new buffer */
1829 ret = os_malloc(*keylen);
1830 if (ret)
1831 os_memcpy(ret, str + 1, *keylen);
1832
1833 out:
1834 /* return new buffer */
1835 os_free(buf);
1836 return ret;
1837 }
1838
1839
radius_free_class(struct radius_class_data * c)1840 void radius_free_class(struct radius_class_data *c)
1841 {
1842 size_t i;
1843 if (c == NULL)
1844 return;
1845 for (i = 0; i < c->count; i++)
1846 os_free(c->attr[i].data);
1847 os_free(c->attr);
1848 c->attr = NULL;
1849 c->count = 0;
1850 }
1851
1852
radius_copy_class(struct radius_class_data * dst,const struct radius_class_data * src)1853 int radius_copy_class(struct radius_class_data *dst,
1854 const struct radius_class_data *src)
1855 {
1856 size_t i;
1857
1858 if (src->attr == NULL)
1859 return 0;
1860
1861 dst->attr = os_calloc(src->count, sizeof(struct radius_attr_data));
1862 if (dst->attr == NULL)
1863 return -1;
1864
1865 dst->count = 0;
1866
1867 for (i = 0; i < src->count; i++) {
1868 dst->attr[i].data = os_memdup(src->attr[i].data,
1869 src->attr[i].len);
1870 if (dst->attr[i].data == NULL)
1871 break;
1872 dst->count++;
1873 dst->attr[i].len = src->attr[i].len;
1874 }
1875
1876 return 0;
1877 }
1878
1879
radius_msg_find_unlisted_attr(struct radius_msg * msg,u8 * attrs)1880 u8 radius_msg_find_unlisted_attr(struct radius_msg *msg, u8 *attrs)
1881 {
1882 size_t i, j;
1883 struct radius_attr_hdr *attr;
1884
1885 for (i = 0; i < msg->attr_used; i++) {
1886 attr = radius_get_attr_hdr(msg, i);
1887
1888 for (j = 0; attrs[j]; j++) {
1889 if (attr->type == attrs[j])
1890 break;
1891 }
1892
1893 if (attrs[j] == 0)
1894 return attr->type; /* unlisted attr */
1895 }
1896
1897 return 0;
1898 }
1899
1900
radius_gen_session_id(u8 * id,size_t len)1901 int radius_gen_session_id(u8 *id, size_t len)
1902 {
1903 /*
1904 * Acct-Session-Id and Acct-Multi-Session-Id should be globally and
1905 * temporarily unique. A high quality random number is required
1906 * therefore. This could be be improved by switching to a GUID.
1907 */
1908 return os_get_random(id, len);
1909 }
1910