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_finish(struct radius_msg * msg,const u8 * secret,size_t secret_len)426 int radius_msg_finish(struct radius_msg *msg, const u8 *secret,
427 size_t secret_len)
428 {
429 if (secret) {
430 u8 auth[MD5_MAC_LEN];
431 struct radius_attr_hdr *attr;
432
433 os_memset(auth, 0, MD5_MAC_LEN);
434 attr = radius_msg_add_attr(msg,
435 RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
436 auth, MD5_MAC_LEN);
437 if (attr == NULL) {
438 wpa_printf(MSG_WARNING, "RADIUS: Could not add "
439 "Message-Authenticator");
440 return -1;
441 }
442 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
443 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
444 wpabuf_len(msg->buf), (u8 *) (attr + 1));
445 } else
446 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
447
448 if (wpabuf_len(msg->buf) > 0xffff) {
449 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
450 (unsigned long) wpabuf_len(msg->buf));
451 return -1;
452 }
453 return 0;
454 }
455
456
radius_msg_finish_srv(struct radius_msg * msg,const u8 * secret,size_t secret_len,const u8 * req_authenticator)457 int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret,
458 size_t secret_len, const u8 *req_authenticator)
459 {
460 u8 auth[MD5_MAC_LEN];
461 struct radius_attr_hdr *attr;
462 const u8 *addr[4];
463 size_t len[4];
464
465 os_memset(auth, 0, MD5_MAC_LEN);
466 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
467 auth, MD5_MAC_LEN);
468 if (attr == NULL) {
469 wpa_printf(MSG_ERROR, "WARNING: Could not add Message-Authenticator");
470 return -1;
471 }
472 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
473 os_memcpy(msg->hdr->authenticator, req_authenticator,
474 sizeof(msg->hdr->authenticator));
475 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
476 wpabuf_len(msg->buf), (u8 *) (attr + 1));
477
478 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
479 addr[0] = (u8 *) msg->hdr;
480 len[0] = 1 + 1 + 2;
481 addr[1] = req_authenticator;
482 len[1] = MD5_MAC_LEN;
483 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
484 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
485 addr[3] = secret;
486 len[3] = secret_len;
487 md5_vector(4, addr, len, msg->hdr->authenticator);
488
489 if (wpabuf_len(msg->buf) > 0xffff) {
490 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
491 (unsigned long) wpabuf_len(msg->buf));
492 return -1;
493 }
494 return 0;
495 }
496
497
radius_msg_finish_das_resp(struct radius_msg * msg,const u8 * secret,size_t secret_len,const struct radius_hdr * req_hdr)498 int radius_msg_finish_das_resp(struct radius_msg *msg, const u8 *secret,
499 size_t secret_len,
500 const struct radius_hdr *req_hdr)
501 {
502 const u8 *addr[2];
503 size_t len[2];
504 u8 auth[MD5_MAC_LEN];
505 struct radius_attr_hdr *attr;
506
507 os_memset(auth, 0, MD5_MAC_LEN);
508 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
509 auth, MD5_MAC_LEN);
510 if (attr == NULL) {
511 wpa_printf(MSG_WARNING, "Could not add Message-Authenticator");
512 return -1;
513 }
514
515 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
516 os_memcpy(msg->hdr->authenticator, req_hdr->authenticator, 16);
517 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
518 wpabuf_len(msg->buf), (u8 *) (attr + 1));
519
520 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
521 addr[0] = wpabuf_head_u8(msg->buf);
522 len[0] = wpabuf_len(msg->buf);
523 addr[1] = secret;
524 len[1] = secret_len;
525 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0)
526 return -1;
527
528 if (wpabuf_len(msg->buf) > 0xffff) {
529 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
530 (unsigned long) wpabuf_len(msg->buf));
531 return -1;
532 }
533 return 0;
534 }
535
536
radius_msg_finish_acct(struct radius_msg * msg,const u8 * secret,size_t secret_len)537 void radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret,
538 size_t secret_len)
539 {
540 const u8 *addr[2];
541 size_t len[2];
542
543 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
544 os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN);
545 addr[0] = wpabuf_head(msg->buf);
546 len[0] = wpabuf_len(msg->buf);
547 addr[1] = secret;
548 len[1] = secret_len;
549 md5_vector(2, addr, len, msg->hdr->authenticator);
550
551 if (wpabuf_len(msg->buf) > 0xffff) {
552 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
553 (unsigned long) wpabuf_len(msg->buf));
554 }
555 }
556
557
radius_msg_finish_acct_resp(struct radius_msg * msg,const u8 * secret,size_t secret_len,const u8 * req_authenticator)558 void radius_msg_finish_acct_resp(struct radius_msg *msg, const u8 *secret,
559 size_t secret_len, const u8 *req_authenticator)
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_memcpy(msg->hdr->authenticator, req_authenticator, 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_verify_acct_req(struct radius_msg * msg,const u8 * secret,size_t secret_len)579 int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret,
580 size_t secret_len)
581 {
582 const u8 *addr[4];
583 size_t len[4];
584 u8 zero[MD5_MAC_LEN];
585 u8 hash[MD5_MAC_LEN];
586
587 os_memset(zero, 0, sizeof(zero));
588 addr[0] = (u8 *) msg->hdr;
589 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
590 addr[1] = zero;
591 len[1] = MD5_MAC_LEN;
592 addr[2] = (u8 *) (msg->hdr + 1);
593 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
594 addr[3] = secret;
595 len[3] = secret_len;
596 md5_vector(4, addr, len, hash);
597 return os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0;
598 }
599
600
radius_msg_verify_das_req(struct radius_msg * msg,const u8 * secret,size_t secret_len,int require_message_authenticator)601 int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret,
602 size_t secret_len,
603 int require_message_authenticator)
604 {
605 const u8 *addr[4];
606 size_t len[4];
607 u8 zero[MD5_MAC_LEN];
608 u8 hash[MD5_MAC_LEN];
609 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
610 u8 orig_authenticator[16];
611
612 struct radius_attr_hdr *attr = NULL, *tmp;
613 size_t i;
614
615 os_memset(zero, 0, sizeof(zero));
616 addr[0] = (u8 *) msg->hdr;
617 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
618 addr[1] = zero;
619 len[1] = MD5_MAC_LEN;
620 addr[2] = (u8 *) (msg->hdr + 1);
621 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
622 addr[3] = secret;
623 len[3] = secret_len;
624 md5_vector(4, addr, len, hash);
625 if (os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0)
626 return 1;
627
628 for (i = 0; i < msg->attr_used; i++) {
629 tmp = radius_get_attr_hdr(msg, i);
630 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
631 if (attr != NULL) {
632 wpa_printf(MSG_WARNING, "Multiple "
633 "Message-Authenticator attributes "
634 "in RADIUS message");
635 return 1;
636 }
637 attr = tmp;
638 }
639 }
640
641 if (attr == NULL) {
642 if (require_message_authenticator) {
643 wpa_printf(MSG_WARNING,
644 "Missing Message-Authenticator attribute in RADIUS message");
645 return 1;
646 }
647 return 0;
648 }
649
650 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
651 os_memset(attr + 1, 0, MD5_MAC_LEN);
652 os_memcpy(orig_authenticator, msg->hdr->authenticator,
653 sizeof(orig_authenticator));
654 os_memset(msg->hdr->authenticator, 0,
655 sizeof(msg->hdr->authenticator));
656 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
657 wpabuf_len(msg->buf), auth);
658 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
659 os_memcpy(msg->hdr->authenticator, orig_authenticator,
660 sizeof(orig_authenticator));
661
662 return os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0;
663 }
664
665
radius_msg_add_attr_to_array(struct radius_msg * msg,struct radius_attr_hdr * attr)666 static int radius_msg_add_attr_to_array(struct radius_msg *msg,
667 struct radius_attr_hdr *attr)
668 {
669 if (msg->attr_used >= msg->attr_size) {
670 size_t *nattr_pos;
671 size_t nlen = msg->attr_size * 2;
672
673 nattr_pos = os_realloc_array(msg->attr_pos, nlen,
674 sizeof(*msg->attr_pos));
675 if (nattr_pos == NULL)
676 return -1;
677
678 msg->attr_pos = nattr_pos;
679 msg->attr_size = nlen;
680 }
681
682 msg->attr_pos[msg->attr_used++] =
683 (unsigned char *) attr - wpabuf_head_u8(msg->buf);
684
685 return 0;
686 }
687
688
radius_msg_add_attr(struct radius_msg * msg,u16 type,const u8 * data,size_t data_len)689 struct radius_attr_hdr * radius_msg_add_attr(struct radius_msg *msg, u16 type,
690 const u8 *data, size_t data_len)
691 {
692 size_t buf_needed, max_len;
693 struct radius_attr_hdr *attr = NULL;
694 struct radius_attr_hdr_ext *ext;
695 u8 ext_type = 0;
696
697 if (TEST_FAIL())
698 return NULL;
699
700 if (type > 255) {
701 if (!radius_is_ext_type(type >> 8)) {
702 wpa_printf(MSG_ERROR,
703 "%s: Undefined extended type %d.%d",
704 __func__, type >> 8, type & 0xff);
705 return NULL;
706 }
707 ext_type = type & 0xff;
708 type >>= 8;
709 } else if (radius_is_ext_type(type)) {
710 wpa_printf(MSG_ERROR, "%s: Unexpected extended type use for %d",
711 __func__, type);
712 }
713
714 if (radius_is_long_ext_type(type)) {
715 size_t hdr_len = sizeof(struct radius_attr_hdr_ext) + 1;
716 size_t plen = 255 - hdr_len;
717 size_t num;
718
719 max_len = 4096;
720 num = (data_len + plen - 1) / plen;
721 if (num == 0)
722 num = 1;
723 buf_needed = num * hdr_len + data_len;
724 } else if (radius_is_ext_type(type)) {
725 max_len = RADIUS_MAX_EXT_ATTR_LEN;
726 buf_needed = sizeof(struct radius_attr_hdr_ext) + data_len;
727 } else {
728 max_len = RADIUS_MAX_ATTR_LEN;
729 buf_needed = sizeof(*attr) + data_len;
730 }
731 if (data_len > max_len) {
732 wpa_printf(MSG_ERROR,
733 "%s: too long attribute (%zu > %zu bytes)",
734 __func__, data_len, max_len);
735 return NULL;
736 }
737
738 if (wpabuf_tailroom(msg->buf) < buf_needed) {
739 /* allocate more space for message buffer */
740 if (wpabuf_resize(&msg->buf, buf_needed) < 0)
741 return NULL;
742 msg->hdr = wpabuf_mhead(msg->buf);
743 }
744
745 if (radius_is_long_ext_type(type)) {
746 size_t plen = 255 - sizeof(struct radius_attr_hdr_ext) - 1;
747 size_t alen;
748
749 do {
750 alen = data_len > plen ? plen : data_len;
751 ext = wpabuf_put(msg->buf,
752 sizeof(struct radius_attr_hdr_ext));
753 if (!attr)
754 attr = (struct radius_attr_hdr *) ext;
755 ext->type = type;
756 ext->length = sizeof(*ext) + 1 + alen;
757 ext->ext_type = ext_type;
758 wpabuf_put_u8(msg->buf, data_len > alen ? 0x80 : 0);
759 wpabuf_put_data(msg->buf, data, data_len);
760 data += alen;
761 data_len -= alen;
762 if (radius_msg_add_attr_to_array(
763 msg, (struct radius_attr_hdr *) ext))
764 return NULL;
765 } while (data_len > 0);
766 } else if (radius_is_ext_type(type)) {
767 ext = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr_ext));
768 attr = (struct radius_attr_hdr *) ext;
769 ext->type = type;
770 ext->length = sizeof(*ext) + data_len;
771 ext->ext_type = ext_type;
772 wpabuf_put_data(msg->buf, data, data_len);
773 if (radius_msg_add_attr_to_array(msg, attr))
774 return NULL;
775 } else {
776 attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr));
777 attr->type = type;
778 attr->length = sizeof(*attr) + data_len;
779 wpabuf_put_data(msg->buf, data, data_len);
780 if (radius_msg_add_attr_to_array(msg, attr))
781 return NULL;
782 }
783
784 return attr;
785 }
786
787
788 /**
789 * radius_msg_parse - Parse a RADIUS message
790 * @data: RADIUS message to be parsed
791 * @len: Length of data buffer in octets
792 * Returns: Parsed RADIUS message or %NULL on failure
793 *
794 * This parses a RADIUS message and makes a copy of its data. The caller is
795 * responsible for freeing the returned data with radius_msg_free().
796 */
radius_msg_parse(const u8 * data,size_t len)797 struct radius_msg * radius_msg_parse(const u8 *data, size_t len)
798 {
799 struct radius_msg *msg;
800 struct radius_hdr *hdr;
801 struct radius_attr_hdr *attr;
802 size_t msg_len;
803 unsigned char *pos, *end;
804
805 if (data == NULL || len < sizeof(*hdr))
806 return NULL;
807
808 hdr = (struct radius_hdr *) data;
809
810 msg_len = be_to_host16(hdr->length);
811 if (msg_len < sizeof(*hdr) || msg_len > len) {
812 wpa_printf(MSG_INFO, "RADIUS: Invalid message length");
813 return NULL;
814 }
815
816 if (msg_len < len) {
817 wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after "
818 "RADIUS message", (unsigned long) len - msg_len);
819 }
820
821 msg = os_zalloc(sizeof(*msg));
822 if (msg == NULL)
823 return NULL;
824
825 msg->buf = wpabuf_alloc_copy(data, msg_len);
826 if (msg->buf == NULL || radius_msg_initialize(msg)) {
827 radius_msg_free(msg);
828 return NULL;
829 }
830 msg->hdr = wpabuf_mhead(msg->buf);
831
832 /* parse attributes */
833 pos = wpabuf_mhead_u8(msg->buf) + sizeof(struct radius_hdr);
834 end = wpabuf_mhead_u8(msg->buf) + wpabuf_len(msg->buf);
835 while (pos < end) {
836 if ((size_t) (end - pos) < sizeof(*attr))
837 goto fail;
838
839 attr = (struct radius_attr_hdr *) pos;
840
841 if (attr->length > end - pos || attr->length < sizeof(*attr))
842 goto fail;
843
844 /* TODO: check that attr->length is suitable for attr->type */
845
846 if (radius_msg_add_attr_to_array(msg, attr))
847 goto fail;
848
849 pos += attr->length;
850 }
851
852 return msg;
853
854 fail:
855 radius_msg_free(msg);
856 return NULL;
857 }
858
859
radius_msg_add_eap(struct radius_msg * msg,const u8 * data,size_t data_len)860 int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len)
861 {
862 const u8 *pos = data;
863 size_t left = data_len;
864
865 while (left > 0) {
866 int len;
867 if (left > RADIUS_MAX_ATTR_LEN)
868 len = RADIUS_MAX_ATTR_LEN;
869 else
870 len = left;
871
872 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE,
873 pos, len))
874 return 0;
875
876 pos += len;
877 left -= len;
878 }
879
880 return 1;
881 }
882
883
radius_msg_get_eap(struct radius_msg * msg)884 struct wpabuf * radius_msg_get_eap(struct radius_msg *msg)
885 {
886 struct wpabuf *eap;
887 size_t len, i;
888 struct radius_attr_hdr *attr;
889
890 if (msg == NULL)
891 return NULL;
892
893 len = 0;
894 for (i = 0; i < msg->attr_used; i++) {
895 attr = radius_get_attr_hdr(msg, i);
896 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
897 attr->length > sizeof(struct radius_attr_hdr))
898 len += attr->length - sizeof(struct radius_attr_hdr);
899 }
900
901 if (len == 0)
902 return NULL;
903
904 eap = wpabuf_alloc(len);
905 if (eap == NULL)
906 return NULL;
907
908 for (i = 0; i < msg->attr_used; i++) {
909 attr = radius_get_attr_hdr(msg, i);
910 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
911 attr->length > sizeof(struct radius_attr_hdr)) {
912 int flen = attr->length - sizeof(*attr);
913 wpabuf_put_data(eap, attr + 1, flen);
914 }
915 }
916
917 return eap;
918 }
919
920
radius_msg_verify_msg_auth(struct radius_msg * msg,const u8 * secret,size_t secret_len,const u8 * req_auth)921 int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret,
922 size_t secret_len, const u8 *req_auth)
923 {
924 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
925 u8 orig_authenticator[16];
926 struct radius_attr_hdr *attr = NULL, *tmp;
927 size_t i;
928
929 for (i = 0; i < msg->attr_used; i++) {
930 tmp = radius_get_attr_hdr(msg, i);
931 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
932 if (attr != NULL) {
933 wpa_printf(MSG_INFO, "Multiple Message-Authenticator attributes in RADIUS message");
934 return 1;
935 }
936 attr = tmp;
937 }
938 }
939
940 if (attr == NULL) {
941 wpa_printf(MSG_INFO, "No Message-Authenticator attribute found");
942 return 1;
943 }
944
945 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
946 os_memset(attr + 1, 0, MD5_MAC_LEN);
947 if (req_auth) {
948 os_memcpy(orig_authenticator, msg->hdr->authenticator,
949 sizeof(orig_authenticator));
950 os_memcpy(msg->hdr->authenticator, req_auth,
951 sizeof(msg->hdr->authenticator));
952 }
953 if (hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
954 wpabuf_len(msg->buf), auth) < 0)
955 return 1;
956 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
957 if (req_auth) {
958 os_memcpy(msg->hdr->authenticator, orig_authenticator,
959 sizeof(orig_authenticator));
960 }
961
962 if (os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0) {
963 wpa_printf(MSG_INFO, "Invalid Message-Authenticator!");
964 return 1;
965 }
966
967 return 0;
968 }
969
970
radius_msg_verify(struct radius_msg * msg,const u8 * secret,size_t secret_len,struct radius_msg * sent_msg,int auth)971 int radius_msg_verify(struct radius_msg *msg, const u8 *secret,
972 size_t secret_len, struct radius_msg *sent_msg, int auth)
973 {
974 const u8 *addr[4];
975 size_t len[4];
976 u8 hash[MD5_MAC_LEN];
977
978 if (sent_msg == NULL) {
979 wpa_printf(MSG_INFO, "No matching Access-Request message found");
980 return 1;
981 }
982
983 if (auth &&
984 radius_msg_verify_msg_auth(msg, secret, secret_len,
985 sent_msg->hdr->authenticator)) {
986 return 1;
987 }
988
989 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
990 addr[0] = (u8 *) msg->hdr;
991 len[0] = 1 + 1 + 2;
992 addr[1] = sent_msg->hdr->authenticator;
993 len[1] = MD5_MAC_LEN;
994 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
995 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
996 addr[3] = secret;
997 len[3] = secret_len;
998 if (md5_vector(4, addr, len, hash) < 0 ||
999 os_memcmp_const(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) {
1000 wpa_printf(MSG_INFO, "Response Authenticator invalid!");
1001 return 1;
1002 }
1003
1004 return 0;
1005 }
1006
1007
radius_msg_copy_attr(struct radius_msg * dst,struct radius_msg * src,u8 type)1008 int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src,
1009 u8 type)
1010 {
1011 struct radius_attr_hdr *attr;
1012 size_t i;
1013 int count = 0;
1014
1015 for (i = 0; i < src->attr_used; i++) {
1016 attr = radius_get_attr_hdr(src, i);
1017 if (attr->type == type && attr->length >= sizeof(*attr)) {
1018 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1),
1019 attr->length - sizeof(*attr)))
1020 return -1;
1021 count++;
1022 }
1023 }
1024
1025 return count;
1026 }
1027
1028
1029 /* Create Request Authenticator. The value should be unique over the lifetime
1030 * of the shared secret between authenticator and authentication server.
1031 */
radius_msg_make_authenticator(struct radius_msg * msg)1032 int radius_msg_make_authenticator(struct radius_msg *msg)
1033 {
1034 return os_get_random((u8 *) &msg->hdr->authenticator,
1035 sizeof(msg->hdr->authenticator));
1036 }
1037
1038
1039 /* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message.
1040 * Returns the Attribute payload and sets alen to indicate the length of the
1041 * payload if a vendor attribute with subtype is found, otherwise returns NULL.
1042 * The returned payload is allocated with os_malloc() and caller must free it
1043 * by calling os_free().
1044 */
radius_msg_get_vendor_attr(struct radius_msg * msg,u32 vendor,u8 subtype,size_t * alen)1045 static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor,
1046 u8 subtype, size_t *alen)
1047 {
1048 u8 *data, *pos;
1049 size_t i, len;
1050
1051 if (msg == NULL)
1052 return NULL;
1053
1054 for (i = 0; i < msg->attr_used; i++) {
1055 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
1056 size_t left;
1057 u32 vendor_id;
1058 struct radius_attr_vendor *vhdr;
1059
1060 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC ||
1061 attr->length < sizeof(*attr))
1062 continue;
1063
1064 left = attr->length - sizeof(*attr);
1065 if (left < 4)
1066 continue;
1067
1068 pos = (u8 *) (attr + 1);
1069
1070 os_memcpy(&vendor_id, pos, 4);
1071 pos += 4;
1072 left -= 4;
1073
1074 if (ntohl(vendor_id) != vendor)
1075 continue;
1076
1077 while (left >= sizeof(*vhdr)) {
1078 vhdr = (struct radius_attr_vendor *) pos;
1079 if (vhdr->vendor_length > left ||
1080 vhdr->vendor_length < sizeof(*vhdr)) {
1081 break;
1082 }
1083 if (vhdr->vendor_type != subtype) {
1084 pos += vhdr->vendor_length;
1085 left -= vhdr->vendor_length;
1086 continue;
1087 }
1088
1089 len = vhdr->vendor_length - sizeof(*vhdr);
1090 data = os_memdup(pos + sizeof(*vhdr), len);
1091 if (data == NULL)
1092 return NULL;
1093 if (alen)
1094 *alen = len;
1095 return data;
1096 }
1097 }
1098
1099 return NULL;
1100 }
1101
1102
decrypt_ms_key(const u8 * key,size_t len,const u8 * req_authenticator,const u8 * secret,size_t secret_len,size_t * reslen)1103 static u8 * decrypt_ms_key(const u8 *key, size_t len,
1104 const u8 *req_authenticator,
1105 const u8 *secret, size_t secret_len, size_t *reslen)
1106 {
1107 u8 *plain, *ppos, *res;
1108 const u8 *pos;
1109 size_t left, plen;
1110 u8 hash[MD5_MAC_LEN];
1111 int i, first = 1;
1112 const u8 *addr[3];
1113 size_t elen[3];
1114
1115 /* key: 16-bit salt followed by encrypted key info */
1116
1117 if (len < 2 + 16) {
1118 wpa_printf(MSG_DEBUG, "RADIUS: %s: Len is too small: %d",
1119 __func__, (int) len);
1120 return NULL;
1121 }
1122
1123 pos = key + 2;
1124 left = len - 2;
1125 if (left % 16) {
1126 wpa_printf(MSG_INFO, "RADIUS: Invalid ms key len %lu",
1127 (unsigned long) left);
1128 return NULL;
1129 }
1130
1131 plen = left;
1132 ppos = plain = os_malloc(plen);
1133 if (plain == NULL)
1134 return NULL;
1135 plain[0] = 0;
1136
1137 while (left > 0) {
1138 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1139 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1140
1141 addr[0] = secret;
1142 elen[0] = secret_len;
1143 if (first) {
1144 addr[1] = req_authenticator;
1145 elen[1] = MD5_MAC_LEN;
1146 addr[2] = key;
1147 elen[2] = 2; /* Salt */
1148 } else {
1149 addr[1] = pos - MD5_MAC_LEN;
1150 elen[1] = MD5_MAC_LEN;
1151 }
1152 if (md5_vector(first ? 3 : 2, addr, elen, hash) < 0) {
1153 os_free(plain);
1154 return NULL;
1155 }
1156 first = 0;
1157
1158 for (i = 0; i < MD5_MAC_LEN; i++)
1159 *ppos++ = *pos++ ^ hash[i];
1160 left -= MD5_MAC_LEN;
1161 }
1162
1163 if (plain[0] == 0 || plain[0] > plen - 1) {
1164 wpa_printf(MSG_INFO, "RADIUS: Failed to decrypt MPPE key");
1165 os_free(plain);
1166 return NULL;
1167 }
1168
1169 res = os_memdup(plain + 1, plain[0]);
1170 if (res == NULL) {
1171 os_free(plain);
1172 return NULL;
1173 }
1174 if (reslen)
1175 *reslen = plain[0];
1176 os_free(plain);
1177 return res;
1178 }
1179
1180
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)1181 static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt,
1182 const u8 *req_authenticator,
1183 const u8 *secret, size_t secret_len,
1184 u8 *ebuf, size_t *elen)
1185 {
1186 int i, len, first = 1;
1187 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos;
1188 const u8 *addr[3];
1189 size_t _len[3];
1190
1191 WPA_PUT_BE16(saltbuf, salt);
1192
1193 len = 1 + key_len;
1194 if (len & 0x0f) {
1195 len = (len & 0xf0) + 16;
1196 }
1197 os_memset(ebuf, 0, len);
1198 ebuf[0] = key_len;
1199 os_memcpy(ebuf + 1, key, key_len);
1200
1201 *elen = len;
1202
1203 pos = ebuf;
1204 while (len > 0) {
1205 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1206 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1207 addr[0] = secret;
1208 _len[0] = secret_len;
1209 if (first) {
1210 addr[1] = req_authenticator;
1211 _len[1] = MD5_MAC_LEN;
1212 addr[2] = saltbuf;
1213 _len[2] = sizeof(saltbuf);
1214 } else {
1215 addr[1] = pos - MD5_MAC_LEN;
1216 _len[1] = MD5_MAC_LEN;
1217 }
1218 md5_vector(first ? 3 : 2, addr, _len, hash);
1219 first = 0;
1220
1221 for (i = 0; i < MD5_MAC_LEN; i++)
1222 *pos++ ^= hash[i];
1223
1224 len -= MD5_MAC_LEN;
1225 }
1226 }
1227
1228
1229 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)1230 radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
1231 const u8 *secret, size_t secret_len)
1232 {
1233 u8 *key;
1234 size_t keylen;
1235 struct radius_ms_mppe_keys *keys;
1236
1237 if (msg == NULL || sent_msg == NULL)
1238 return NULL;
1239
1240 keys = os_zalloc(sizeof(*keys));
1241 if (keys == NULL)
1242 return NULL;
1243
1244 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1245 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY,
1246 &keylen);
1247 if (key) {
1248 keys->send = decrypt_ms_key(key, keylen,
1249 sent_msg->hdr->authenticator,
1250 secret, secret_len,
1251 &keys->send_len);
1252 if (!keys->send) {
1253 wpa_printf(MSG_DEBUG,
1254 "RADIUS: Failed to decrypt send key");
1255 }
1256 os_free(key);
1257 }
1258
1259 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1260 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY,
1261 &keylen);
1262 if (key) {
1263 keys->recv = decrypt_ms_key(key, keylen,
1264 sent_msg->hdr->authenticator,
1265 secret, secret_len,
1266 &keys->recv_len);
1267 if (!keys->recv) {
1268 wpa_printf(MSG_DEBUG,
1269 "RADIUS: Failed to decrypt recv key");
1270 }
1271 os_free(key);
1272 }
1273
1274 return keys;
1275 }
1276
1277
1278 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)1279 radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
1280 const u8 *secret, size_t secret_len)
1281 {
1282 u8 *key;
1283 size_t keylen;
1284 struct radius_ms_mppe_keys *keys;
1285
1286 if (msg == NULL || sent_msg == NULL)
1287 return NULL;
1288
1289 keys = os_zalloc(sizeof(*keys));
1290 if (keys == NULL)
1291 return NULL;
1292
1293 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO,
1294 RADIUS_CISCO_AV_PAIR, &keylen);
1295 if (key && keylen == 51 &&
1296 os_memcmp(key, "leap:session-key=", 17) == 0) {
1297 keys->recv = decrypt_ms_key(key + 17, keylen - 17,
1298 sent_msg->hdr->authenticator,
1299 secret, secret_len,
1300 &keys->recv_len);
1301 }
1302 os_free(key);
1303
1304 return keys;
1305 }
1306
1307
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)1308 int radius_msg_add_mppe_keys(struct radius_msg *msg,
1309 const u8 *req_authenticator,
1310 const u8 *secret, size_t secret_len,
1311 const u8 *send_key, size_t send_key_len,
1312 const u8 *recv_key, size_t recv_key_len)
1313 {
1314 struct radius_attr_hdr *attr;
1315 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT);
1316 u8 *buf;
1317 struct radius_attr_vendor *vhdr;
1318 u8 *pos;
1319 size_t elen;
1320 int hlen;
1321 u16 salt;
1322
1323 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2;
1324
1325 /* MS-MPPE-Send-Key */
1326 buf = os_malloc(hlen + send_key_len + 16);
1327 if (buf == NULL) {
1328 return 0;
1329 }
1330 pos = buf;
1331 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1332 pos += sizeof(vendor_id);
1333 vhdr = (struct radius_attr_vendor *) pos;
1334 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY;
1335 pos = (u8 *) (vhdr + 1);
1336 if (os_get_random((u8 *) &salt, sizeof(salt)) < 0) {
1337 os_free(buf);
1338 return 0;
1339 }
1340 salt |= 0x8000;
1341 WPA_PUT_BE16(pos, salt);
1342 pos += 2;
1343 encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret,
1344 secret_len, pos, &elen);
1345 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1346
1347 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1348 buf, hlen + elen);
1349 os_free(buf);
1350 if (attr == NULL) {
1351 return 0;
1352 }
1353
1354 /* MS-MPPE-Recv-Key */
1355 buf = os_malloc(hlen + recv_key_len + 16);
1356 if (buf == NULL) {
1357 return 0;
1358 }
1359 pos = buf;
1360 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1361 pos += sizeof(vendor_id);
1362 vhdr = (struct radius_attr_vendor *) pos;
1363 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY;
1364 pos = (u8 *) (vhdr + 1);
1365 salt ^= 1;
1366 WPA_PUT_BE16(pos, salt);
1367 pos += 2;
1368 encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret,
1369 secret_len, pos, &elen);
1370 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1371
1372 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1373 buf, hlen + elen);
1374 os_free(buf);
1375 if (attr == NULL) {
1376 return 0;
1377 }
1378
1379 return 1;
1380 }
1381
1382
radius_msg_add_wfa(struct radius_msg * msg,u8 subtype,const u8 * data,size_t len)1383 int radius_msg_add_wfa(struct radius_msg *msg, u8 subtype, const u8 *data,
1384 size_t len)
1385 {
1386 struct radius_attr_hdr *attr;
1387 u8 *buf, *pos;
1388 size_t alen;
1389
1390 alen = 4 + 2 + len;
1391 buf = os_malloc(alen);
1392 if (buf == NULL)
1393 return 0;
1394 pos = buf;
1395 WPA_PUT_BE32(pos, RADIUS_VENDOR_ID_WFA);
1396 pos += 4;
1397 *pos++ = subtype;
1398 *pos++ = 2 + len;
1399 os_memcpy(pos, data, len);
1400 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1401 buf, alen);
1402 os_free(buf);
1403 if (attr == NULL)
1404 return 0;
1405
1406 return 1;
1407 }
1408
1409
radius_msg_add_ext_vs(struct radius_msg * msg,u16 type,u32 vendor_id,u8 vendor_type,const u8 * data,size_t len)1410 int radius_msg_add_ext_vs(struct radius_msg *msg, u16 type, u32 vendor_id,
1411 u8 vendor_type, const u8 *data, size_t len)
1412 {
1413 struct radius_attr_hdr *attr;
1414 u8 *buf, *pos;
1415 size_t alen;
1416
1417 alen = 4 + 1 + len;
1418 buf = os_malloc(alen);
1419 if (!buf)
1420 return 0;
1421 pos = buf;
1422 WPA_PUT_BE32(pos, vendor_id);
1423 pos += 4;
1424 *pos++ = vendor_type;
1425 os_memcpy(pos, data, len);
1426 attr = radius_msg_add_attr(msg, type, buf, alen);
1427 os_free(buf);
1428 return attr != NULL;
1429 }
1430
1431
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)1432 int radius_user_password_hide(struct radius_msg *msg,
1433 const u8 *data, size_t data_len,
1434 const u8 *secret, size_t secret_len,
1435 u8 *buf, size_t buf_len)
1436 {
1437 size_t padlen, i, pos;
1438 const u8 *addr[2];
1439 size_t len[2];
1440 u8 hash[16];
1441
1442 if (data_len + 16 > buf_len)
1443 return -1;
1444
1445 os_memcpy(buf, data, data_len);
1446
1447 padlen = data_len % 16;
1448 if (padlen && data_len < buf_len) {
1449 padlen = 16 - padlen;
1450 os_memset(buf + data_len, 0, padlen);
1451 buf_len = data_len + padlen;
1452 } else {
1453 buf_len = data_len;
1454 }
1455
1456 addr[0] = secret;
1457 len[0] = secret_len;
1458 addr[1] = msg->hdr->authenticator;
1459 len[1] = 16;
1460 md5_vector(2, addr, len, hash);
1461
1462 for (i = 0; i < 16; i++)
1463 buf[i] ^= hash[i];
1464 pos = 16;
1465
1466 while (pos < buf_len) {
1467 addr[0] = secret;
1468 len[0] = secret_len;
1469 addr[1] = &buf[pos - 16];
1470 len[1] = 16;
1471 md5_vector(2, addr, len, hash);
1472
1473 for (i = 0; i < 16; i++)
1474 buf[pos + i] ^= hash[i];
1475
1476 pos += 16;
1477 }
1478
1479 return buf_len;
1480 }
1481
1482
1483 /* Add User-Password attribute to a RADIUS message and encrypt it as specified
1484 * in RFC 2865, Chap. 5.2 */
1485 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)1486 radius_msg_add_attr_user_password(struct radius_msg *msg,
1487 const u8 *data, size_t data_len,
1488 const u8 *secret, size_t secret_len)
1489 {
1490 u8 buf[128];
1491 int res;
1492
1493 res = radius_user_password_hide(msg, data, data_len,
1494 secret, secret_len, buf, sizeof(buf));
1495 if (res < 0)
1496 return NULL;
1497
1498 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD,
1499 buf, res);
1500 }
1501
1502
radius_msg_get_attr(struct radius_msg * msg,u8 type,u8 * buf,size_t len)1503 int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len)
1504 {
1505 struct radius_attr_hdr *attr = NULL, *tmp;
1506 size_t i, dlen;
1507
1508 for (i = 0; i < msg->attr_used; i++) {
1509 tmp = radius_get_attr_hdr(msg, i);
1510 if (tmp->type == type) {
1511 attr = tmp;
1512 break;
1513 }
1514 }
1515
1516 if (!attr || attr->length < sizeof(*attr))
1517 return -1;
1518
1519 dlen = attr->length - sizeof(*attr);
1520 if (buf)
1521 os_memcpy(buf, (attr + 1), dlen > len ? len : dlen);
1522 return dlen;
1523 }
1524
1525
radius_msg_get_attr_ptr(struct radius_msg * msg,u8 type,u8 ** buf,size_t * len,const u8 * start)1526 int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf,
1527 size_t *len, const u8 *start)
1528 {
1529 size_t i;
1530 struct radius_attr_hdr *attr = NULL, *tmp;
1531
1532 for (i = 0; i < msg->attr_used; i++) {
1533 tmp = radius_get_attr_hdr(msg, i);
1534 if (tmp->type == type &&
1535 (start == NULL || (u8 *) tmp > start)) {
1536 attr = tmp;
1537 break;
1538 }
1539 }
1540
1541 if (!attr || attr->length < sizeof(*attr))
1542 return -1;
1543
1544 *buf = (u8 *) (attr + 1);
1545 *len = attr->length - sizeof(*attr);
1546 return 0;
1547 }
1548
1549
radius_msg_count_attr(struct radius_msg * msg,u8 type,int min_len)1550 int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len)
1551 {
1552 size_t i;
1553 int count;
1554
1555 for (count = 0, i = 0; i < msg->attr_used; i++) {
1556 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
1557 if (attr->type == type &&
1558 attr->length >= sizeof(struct radius_attr_hdr) + min_len)
1559 count++;
1560 }
1561
1562 return count;
1563 }
1564
1565
1566 struct radius_tunnel_attrs {
1567 int tag_used;
1568 int type; /* Tunnel-Type */
1569 int medium_type; /* Tunnel-Medium-Type */
1570 int vlanid;
1571 };
1572
1573
cmp_int(const void * a,const void * b)1574 static int cmp_int(const void *a, const void *b)
1575 {
1576 int x, y;
1577
1578 x = *((int *) a);
1579 y = *((int *) b);
1580 return (x - y);
1581 }
1582
1583
1584 /**
1585 * radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information
1586 * The k tagged vlans found are sorted by vlan_id and stored in the first k
1587 * items of tagged.
1588 *
1589 * @msg: RADIUS message
1590 * @untagged: Pointer to store untagged vid
1591 * @numtagged: Size of tagged
1592 * @tagged: Pointer to store tagged list
1593 *
1594 * Returns: 0 if neither tagged nor untagged configuration is found, 1 otherwise
1595 */
radius_msg_get_vlanid(struct radius_msg * msg,int * untagged,int numtagged,int * tagged)1596 int radius_msg_get_vlanid(struct radius_msg *msg, int *untagged, int numtagged,
1597 int *tagged)
1598 {
1599 struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun;
1600 size_t i;
1601 struct radius_attr_hdr *attr = NULL;
1602 const u8 *data;
1603 char buf[10];
1604 size_t dlen;
1605 int j, taggedidx = 0, vlan_id;
1606
1607 os_memset(&tunnel, 0, sizeof(tunnel));
1608 for (j = 0; j < numtagged; j++)
1609 tagged[j] = 0;
1610 *untagged = 0;
1611
1612 for (i = 0; i < msg->attr_used; i++) {
1613 attr = radius_get_attr_hdr(msg, i);
1614 if (attr->length < sizeof(*attr))
1615 return -1;
1616 data = (const u8 *) (attr + 1);
1617 dlen = attr->length - sizeof(*attr);
1618 if (attr->length < 3)
1619 continue;
1620 if (data[0] >= RADIUS_TUNNEL_TAGS)
1621 tun = &tunnel[0];
1622 else
1623 tun = &tunnel[data[0]];
1624
1625 switch (attr->type) {
1626 case RADIUS_ATTR_TUNNEL_TYPE:
1627 if (attr->length != 6)
1628 break;
1629 tun->tag_used++;
1630 tun->type = WPA_GET_BE24(data + 1);
1631 break;
1632 case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE:
1633 if (attr->length != 6)
1634 break;
1635 tun->tag_used++;
1636 tun->medium_type = WPA_GET_BE24(data + 1);
1637 break;
1638 case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID:
1639 if (data[0] < RADIUS_TUNNEL_TAGS) {
1640 data++;
1641 dlen--;
1642 }
1643 if (dlen >= sizeof(buf))
1644 break;
1645 os_memcpy(buf, data, dlen);
1646 buf[dlen] = '\0';
1647 vlan_id = atoi(buf);
1648 if (vlan_id <= 0)
1649 break;
1650 tun->tag_used++;
1651 tun->vlanid = vlan_id;
1652 break;
1653 case RADIUS_ATTR_EGRESS_VLANID: /* RFC 4675 */
1654 if (attr->length != 6)
1655 break;
1656 vlan_id = WPA_GET_BE24(data + 1);
1657 if (vlan_id <= 0)
1658 break;
1659 if (data[0] == 0x32)
1660 *untagged = vlan_id;
1661 else if (data[0] == 0x31 && tagged &&
1662 taggedidx < numtagged)
1663 tagged[taggedidx++] = vlan_id;
1664 break;
1665 }
1666 }
1667
1668 /* Use tunnel with the lowest tag for untagged VLAN id */
1669 for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) {
1670 tun = &tunnel[i];
1671 if (tun->tag_used &&
1672 tun->type == RADIUS_TUNNEL_TYPE_VLAN &&
1673 tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 &&
1674 tun->vlanid > 0) {
1675 *untagged = tun->vlanid;
1676 break;
1677 }
1678 }
1679
1680 if (taggedidx)
1681 qsort(tagged, taggedidx, sizeof(int), cmp_int);
1682
1683 if (*untagged > 0 || taggedidx)
1684 return 1;
1685 return 0;
1686 }
1687
1688
1689 /**
1690 * radius_msg_get_tunnel_password - Parse RADIUS attribute Tunnel-Password
1691 * @msg: Received RADIUS message
1692 * @keylen: Length of returned password
1693 * @secret: RADIUS shared secret
1694 * @secret_len: Length of secret
1695 * @sent_msg: Sent RADIUS message
1696 * @n: Number of password attribute to return (starting with 0)
1697 * Returns: Pointer to n-th password (free with os_free) or %NULL
1698 */
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)1699 char * radius_msg_get_tunnel_password(struct radius_msg *msg, int *keylen,
1700 const u8 *secret, size_t secret_len,
1701 struct radius_msg *sent_msg, size_t n)
1702 {
1703 u8 *buf = NULL;
1704 size_t buflen;
1705 const u8 *salt;
1706 u8 *str;
1707 const u8 *addr[3];
1708 size_t len[3];
1709 u8 hash[16];
1710 u8 *pos;
1711 size_t i, j = 0;
1712 struct radius_attr_hdr *attr;
1713 const u8 *data;
1714 size_t dlen;
1715 const u8 *fdata = NULL; /* points to found item */
1716 size_t fdlen = -1;
1717 char *ret = NULL;
1718
1719 /* find n-th valid Tunnel-Password attribute */
1720 for (i = 0; i < msg->attr_used; i++) {
1721 attr = radius_get_attr_hdr(msg, i);
1722 if (attr == NULL ||
1723 attr->type != RADIUS_ATTR_TUNNEL_PASSWORD) {
1724 continue;
1725 }
1726 if (attr->length <= 5)
1727 continue;
1728 data = (const u8 *) (attr + 1);
1729 dlen = attr->length - sizeof(*attr);
1730 if (dlen <= 3 || dlen % 16 != 3)
1731 continue;
1732 j++;
1733 if (j <= n)
1734 continue;
1735
1736 fdata = data;
1737 fdlen = dlen;
1738 break;
1739 }
1740 if (fdata == NULL)
1741 goto out;
1742
1743 /* alloc writable memory for decryption */
1744 buf = os_memdup(fdata, fdlen);
1745 if (buf == NULL)
1746 goto out;
1747 buflen = fdlen;
1748
1749 /* init pointers */
1750 salt = buf + 1;
1751 str = buf + 3;
1752
1753 /* decrypt blocks */
1754 pos = buf + buflen - 16; /* last block */
1755 while (pos >= str + 16) { /* all but the first block */
1756 addr[0] = secret;
1757 len[0] = secret_len;
1758 addr[1] = pos - 16;
1759 len[1] = 16;
1760 md5_vector(2, addr, len, hash);
1761
1762 for (i = 0; i < 16; i++)
1763 pos[i] ^= hash[i];
1764
1765 pos -= 16;
1766 }
1767
1768 /* decrypt first block */
1769 if (str != pos)
1770 goto out;
1771 addr[0] = secret;
1772 len[0] = secret_len;
1773 addr[1] = sent_msg->hdr->authenticator;
1774 len[1] = 16;
1775 addr[2] = salt;
1776 len[2] = 2;
1777 md5_vector(3, addr, len, hash);
1778
1779 for (i = 0; i < 16; i++)
1780 pos[i] ^= hash[i];
1781
1782 /* derive plaintext length from first subfield */
1783 *keylen = (unsigned char) str[0];
1784 if ((u8 *) (str + *keylen) >= (u8 *) (buf + buflen)) {
1785 /* decryption error - invalid key length */
1786 goto out;
1787 }
1788 if (*keylen == 0) {
1789 /* empty password */
1790 goto out;
1791 }
1792
1793 /* copy passphrase into new buffer */
1794 ret = os_malloc(*keylen);
1795 if (ret)
1796 os_memcpy(ret, str + 1, *keylen);
1797
1798 out:
1799 /* return new buffer */
1800 os_free(buf);
1801 return ret;
1802 }
1803
1804
radius_free_class(struct radius_class_data * c)1805 void radius_free_class(struct radius_class_data *c)
1806 {
1807 size_t i;
1808 if (c == NULL)
1809 return;
1810 for (i = 0; i < c->count; i++)
1811 os_free(c->attr[i].data);
1812 os_free(c->attr);
1813 c->attr = NULL;
1814 c->count = 0;
1815 }
1816
1817
radius_copy_class(struct radius_class_data * dst,const struct radius_class_data * src)1818 int radius_copy_class(struct radius_class_data *dst,
1819 const struct radius_class_data *src)
1820 {
1821 size_t i;
1822
1823 if (src->attr == NULL)
1824 return 0;
1825
1826 dst->attr = os_calloc(src->count, sizeof(struct radius_attr_data));
1827 if (dst->attr == NULL)
1828 return -1;
1829
1830 dst->count = 0;
1831
1832 for (i = 0; i < src->count; i++) {
1833 dst->attr[i].data = os_memdup(src->attr[i].data,
1834 src->attr[i].len);
1835 if (dst->attr[i].data == NULL)
1836 break;
1837 dst->count++;
1838 dst->attr[i].len = src->attr[i].len;
1839 }
1840
1841 return 0;
1842 }
1843
1844
radius_msg_find_unlisted_attr(struct radius_msg * msg,u8 * attrs)1845 u8 radius_msg_find_unlisted_attr(struct radius_msg *msg, u8 *attrs)
1846 {
1847 size_t i, j;
1848 struct radius_attr_hdr *attr;
1849
1850 for (i = 0; i < msg->attr_used; i++) {
1851 attr = radius_get_attr_hdr(msg, i);
1852
1853 for (j = 0; attrs[j]; j++) {
1854 if (attr->type == attrs[j])
1855 break;
1856 }
1857
1858 if (attrs[j] == 0)
1859 return attr->type; /* unlisted attr */
1860 }
1861
1862 return 0;
1863 }
1864
1865
radius_gen_session_id(u8 * id,size_t len)1866 int radius_gen_session_id(u8 *id, size_t len)
1867 {
1868 /*
1869 * Acct-Session-Id and Acct-Multi-Session-Id should be globally and
1870 * temporarily unique. A high quality random number is required
1871 * therefore. This could be be improved by switching to a GUID.
1872 */
1873 return os_get_random(id, len);
1874 }
1875