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tests: Add TEST_FAIL() to radius_msg_add_attr()
[thirdparty/hostap.git] / src / radius / radius.c
CommitLineData
6fc6879b 1/*
d04a96b0 2 * RADIUS message processing
1166b20c 3 * Copyright (c) 2002-2009, 2011-2015, Jouni Malinen <j@w1.fi>
6fc6879b 4 *
0f3d578e
JM		 5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
6fc6879b
JM		 7 */
8
d04a96b0 9#include "utils/includes.h"
6fc6879b 10
d04a96b0 11#include "utils/common.h"
aa235d2e 12#include "utils/wpabuf.h"
03da66bd
JM		 13#include "crypto/md5.h"
14#include "crypto/crypto.h"
d04a96b0
JM		 15#include "radius.h"
16
17
1489e11a
JM		 18/**
19 * struct radius_msg - RADIUS message structure for new and parsed messages
20 */
21struct 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
52struct radius_hdr * radius_msg_get_hdr(struct radius_msg *msg)
53{
54 return msg->hdr;
55}
56
57
58struct wpabuf * radius_msg_get_buf(struct radius_msg *msg)
59{
60 return msg->buf;
61}
62
63
6fc6879b
JM		 64static struct radius_attr_hdr *
65radius_get_attr_hdr(struct radius_msg *msg, int idx)
66{
aa235d2e
JM		 67 return (struct radius_attr_hdr *)
68 (wpabuf_mhead_u8(msg->buf) + msg->attr_pos[idx]);
6fc6879b
JM		 69}
70
71
d04a96b0
JM		 72static 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
aa235d2e 79static int radius_msg_initialize(struct radius_msg *msg)
6fc6879b 80{
f9884c09
JM		 81 msg->attr_pos = os_calloc(RADIUS_DEFAULT_ATTR_COUNT,
82 sizeof(*msg->attr_pos));
aa235d2e 83 if (msg->attr_pos == NULL)
6fc6879b 84 return -1;
6fc6879b
JM		 85
86 msg->attr_size = RADIUS_DEFAULT_ATTR_COUNT;
87 msg->attr_used = 0;
88
89 return 0;
90}
91
92
9e7245bd
JM		 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 */
d94f86d8
JM		 102struct 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
aa235d2e
JM		 110 msg->buf = wpabuf_alloc(RADIUS_DEFAULT_MSG_SIZE);
111 if (msg->buf == NULL || radius_msg_initialize(msg)) {
112 radius_msg_free(msg);
d94f86d8
JM		 113 return NULL;
114 }
aa235d2e 115 msg->hdr = wpabuf_put(msg->buf, sizeof(struct radius_hdr));
d94f86d8
JM		 116
117 radius_msg_set_hdr(msg, code, identifier);
118
119 return msg;
120}
121
122
9e7245bd
JM		 123/**
124 * radius_msg_free - Free a RADIUS message
125 * @msg: RADIUS message from radius_msg_new() or radius_msg_parse()
126 */
6fc6879b
JM		 127void radius_msg_free(struct radius_msg *msg)
128{
9e7245bd
JM		 129 if (msg == NULL)
130 return;
6fc6879b 131
aa235d2e 132 wpabuf_free(msg->buf);
6fc6879b 133 os_free(msg->attr_pos);
9e7245bd 134 os_free(msg);
6fc6879b
JM		 135}
136
137
138static 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";
b031338c
JM		 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";
6fc6879b
JM		 156 default: return "?Unknown?";
157 }
158}
159
160
161struct radius_attr_type {
162 u8 type;
163 char *name;
164 enum {
165 RADIUS_ATTR_UNDIST, RADIUS_ATTR_TEXT, RADIUS_ATTR_IP,
166 RADIUS_ATTR_HEXDUMP, RADIUS_ATTR_INT32, RADIUS_ATTR_IPV6
167 } data_type;
168};
169
8b423edb 170static const struct radius_attr_type radius_attrs[] =
6fc6879b
JM		 171{
172 { RADIUS_ATTR_USER_NAME, "User-Name", RADIUS_ATTR_TEXT },
173 { RADIUS_ATTR_USER_PASSWORD, "User-Password", RADIUS_ATTR_UNDIST },
174 { RADIUS_ATTR_NAS_IP_ADDRESS, "NAS-IP-Address", RADIUS_ATTR_IP },
175 { RADIUS_ATTR_NAS_PORT, "NAS-Port", RADIUS_ATTR_INT32 },
8c676b50 176 { RADIUS_ATTR_SERVICE_TYPE, "Service-Type", RADIUS_ATTR_INT32 },
1166b20c 177 { RADIUS_ATTR_FRAMED_IP_ADDRESS, "Framed-IP-Address", RADIUS_ATTR_IP },
6fc6879b
JM		 178 { RADIUS_ATTR_FRAMED_MTU, "Framed-MTU", RADIUS_ATTR_INT32 },
179 { RADIUS_ATTR_REPLY_MESSAGE, "Reply-Message", RADIUS_ATTR_TEXT },
180 { RADIUS_ATTR_STATE, "State", RADIUS_ATTR_UNDIST },
181 { RADIUS_ATTR_CLASS, "Class", RADIUS_ATTR_UNDIST },
182 { RADIUS_ATTR_VENDOR_SPECIFIC, "Vendor-Specific", RADIUS_ATTR_UNDIST },
183 { RADIUS_ATTR_SESSION_TIMEOUT, "Session-Timeout", RADIUS_ATTR_INT32 },
184 { RADIUS_ATTR_IDLE_TIMEOUT, "Idle-Timeout", RADIUS_ATTR_INT32 },
185 { RADIUS_ATTR_TERMINATION_ACTION, "Termination-Action",
186 RADIUS_ATTR_INT32 },
187 { RADIUS_ATTR_CALLED_STATION_ID, "Called-Station-Id",
188 RADIUS_ATTR_TEXT },
189 { RADIUS_ATTR_CALLING_STATION_ID, "Calling-Station-Id",
190 RADIUS_ATTR_TEXT },
191 { RADIUS_ATTR_NAS_IDENTIFIER, "NAS-Identifier", RADIUS_ATTR_TEXT },
192 { RADIUS_ATTR_PROXY_STATE, "Proxy-State", RADIUS_ATTR_UNDIST },
193 { RADIUS_ATTR_ACCT_STATUS_TYPE, "Acct-Status-Type",
194 RADIUS_ATTR_INT32 },
195 { RADIUS_ATTR_ACCT_DELAY_TIME, "Acct-Delay-Time", RADIUS_ATTR_INT32 },
196 { RADIUS_ATTR_ACCT_INPUT_OCTETS, "Acct-Input-Octets",
197 RADIUS_ATTR_INT32 },
198 { RADIUS_ATTR_ACCT_OUTPUT_OCTETS, "Acct-Output-Octets",
199 RADIUS_ATTR_INT32 },
200 { RADIUS_ATTR_ACCT_SESSION_ID, "Acct-Session-Id", RADIUS_ATTR_TEXT },
201 { RADIUS_ATTR_ACCT_AUTHENTIC, "Acct-Authentic", RADIUS_ATTR_INT32 },
202 { RADIUS_ATTR_ACCT_SESSION_TIME, "Acct-Session-Time",
203 RADIUS_ATTR_INT32 },
204 { RADIUS_ATTR_ACCT_INPUT_PACKETS, "Acct-Input-Packets",
205 RADIUS_ATTR_INT32 },
206 { RADIUS_ATTR_ACCT_OUTPUT_PACKETS, "Acct-Output-Packets",
207 RADIUS_ATTR_INT32 },
208 { RADIUS_ATTR_ACCT_TERMINATE_CAUSE, "Acct-Terminate-Cause",
209 RADIUS_ATTR_INT32 },
210 { RADIUS_ATTR_ACCT_MULTI_SESSION_ID, "Acct-Multi-Session-Id",
211 RADIUS_ATTR_TEXT },
212 { RADIUS_ATTR_ACCT_LINK_COUNT, "Acct-Link-Count", RADIUS_ATTR_INT32 },
95de34a1 213 { RADIUS_ATTR_ACCT_INPUT_GIGAWORDS, "Acct-Input-Gigawords",
6fc6879b
JM		 214 RADIUS_ATTR_INT32 },
215 { RADIUS_ATTR_ACCT_OUTPUT_GIGAWORDS, "Acct-Output-Gigawords",
216 RADIUS_ATTR_INT32 },
217 { RADIUS_ATTR_EVENT_TIMESTAMP, "Event-Timestamp",
218 RADIUS_ATTR_INT32 },
8e44c192 219 { RADIUS_ATTR_EGRESS_VLANID, "EGRESS-VLANID", RADIUS_ATTR_HEXDUMP },
6fc6879b
JM		 220 { RADIUS_ATTR_NAS_PORT_TYPE, "NAS-Port-Type", RADIUS_ATTR_INT32 },
221 { RADIUS_ATTR_TUNNEL_TYPE, "Tunnel-Type", RADIUS_ATTR_HEXDUMP },
222 { RADIUS_ATTR_TUNNEL_MEDIUM_TYPE, "Tunnel-Medium-Type",
223 RADIUS_ATTR_HEXDUMP },
05ab9712
MB		 224 { RADIUS_ATTR_TUNNEL_PASSWORD, "Tunnel-Password",
225 RADIUS_ATTR_UNDIST },
6fc6879b
JM		 226 { RADIUS_ATTR_CONNECT_INFO, "Connect-Info", RADIUS_ATTR_TEXT },
227 { RADIUS_ATTR_EAP_MESSAGE, "EAP-Message", RADIUS_ATTR_UNDIST },
228 { RADIUS_ATTR_MESSAGE_AUTHENTICATOR, "Message-Authenticator",
229 RADIUS_ATTR_UNDIST },
230 { RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID, "Tunnel-Private-Group-Id",
231 RADIUS_ATTR_HEXDUMP },
232 { RADIUS_ATTR_ACCT_INTERIM_INTERVAL, "Acct-Interim-Interval",
233 RADIUS_ATTR_INT32 },
e58b5ffe 234 { RADIUS_ATTR_CHARGEABLE_USER_IDENTITY, "Chargeable-User-Identity",
1e4b9da1 235 RADIUS_ATTR_TEXT },
6fc6879b 236 { RADIUS_ATTR_NAS_IPV6_ADDRESS, "NAS-IPv6-Address", RADIUS_ATTR_IPV6 },
251c53e0
JM		 237 { RADIUS_ATTR_ERROR_CAUSE, "Error-Cause", RADIUS_ATTR_INT32 },
238 { RADIUS_ATTR_EAP_KEY_NAME, "EAP-Key-Name", RADIUS_ATTR_HEXDUMP },
0ffe7a54
JM		 239 { RADIUS_ATTR_OPERATOR_NAME, "Operator-Name", RADIUS_ATTR_TEXT },
240 { RADIUS_ATTR_LOCATION_INFO, "Location-Information",
241 RADIUS_ATTR_HEXDUMP },
242 { RADIUS_ATTR_LOCATION_DATA, "Location-Data", RADIUS_ATTR_HEXDUMP },
243 { RADIUS_ATTR_BASIC_LOCATION_POLICY_RULES,
244 "Basic-Location-Policy-Rules", RADIUS_ATTR_HEXDUMP },
245 { RADIUS_ATTR_EXTENDED_LOCATION_POLICY_RULES,
246 "Extended-Location-Policy-Rules", RADIUS_ATTR_HEXDUMP },
247 { RADIUS_ATTR_LOCATION_CAPABLE, "Location-Capable", RADIUS_ATTR_INT32 },
248 { RADIUS_ATTR_REQUESTED_LOCATION_INFO, "Requested-Location-Info",
249 RADIUS_ATTR_INT32 },
69002fb0
JM		 250 { RADIUS_ATTR_MOBILITY_DOMAIN_ID, "Mobility-Domain-Id",
251 RADIUS_ATTR_INT32 },
cdffd721 252 { RADIUS_ATTR_WLAN_HESSID, "WLAN-HESSID", RADIUS_ATTR_TEXT },
6c460eaf
JM		 253 { RADIUS_ATTR_WLAN_PAIRWISE_CIPHER, "WLAN-Pairwise-Cipher",
254 RADIUS_ATTR_HEXDUMP },
255 { RADIUS_ATTR_WLAN_GROUP_CIPHER, "WLAN-Group-Cipher",
256 RADIUS_ATTR_HEXDUMP },
257 { RADIUS_ATTR_WLAN_AKM_SUITE, "WLAN-AKM-Suite",
258 RADIUS_ATTR_HEXDUMP },
259 { RADIUS_ATTR_WLAN_GROUP_MGMT_CIPHER, "WLAN-Group-Mgmt-Pairwise-Cipher",
260 RADIUS_ATTR_HEXDUMP },
6fc6879b 261};
e7ecab4a 262#define RADIUS_ATTRS ARRAY_SIZE(radius_attrs)
6fc6879b
JM		 263
264
8b423edb 265static const struct radius_attr_type *radius_get_attr_type(u8 type)
6fc6879b
JM		 266{
267 size_t i;
268
269 for (i = 0; i < RADIUS_ATTRS; i++) {
270 if (type == radius_attrs[i].type)
271 return &radius_attrs[i];
272 }
273
274 return NULL;
275}
276
277
6fc6879b
JM		 278static void radius_msg_dump_attr(struct radius_attr_hdr *hdr)
279{
8b423edb 280 const struct radius_attr_type *attr;
38ecb06e 281 int len;
6fc6879b 282 unsigned char *pos;
38ecb06e 283 char buf[1000];
6fc6879b
JM		 284
285 attr = radius_get_attr_type(hdr->type);
286
38ecb06e
JM		 287 wpa_printf(MSG_INFO, " Attribute %d (%s) length=%d",
288 hdr->type, attr ? attr->name : "?Unknown?", hdr->length);
6fc6879b 289
47e9d50d 290 if (attr == NULL || hdr->length < sizeof(struct radius_attr_hdr))
6fc6879b
JM		 291 return;
292
293 len = hdr->length - sizeof(struct radius_attr_hdr);
294 pos = (unsigned char *) (hdr + 1);
295
296 switch (attr->data_type) {
297 case RADIUS_ATTR_TEXT:
38ecb06e
JM		 298 printf_encode(buf, sizeof(buf), pos, len);
299 wpa_printf(MSG_INFO, " Value: '%s'", buf);
6fc6879b
JM		 300 break;
301
302 case RADIUS_ATTR_IP:
303 if (len == 4) {
304 struct in_addr addr;
305 os_memcpy(&addr, pos, 4);
38ecb06e
JM		 306 wpa_printf(MSG_INFO, " Value: %s",
307 inet_ntoa(addr));
308 } else {
309 wpa_printf(MSG_INFO, " Invalid IP address length %d",
310 len);
311 }
6fc6879b
JM		 312 break;
313
314#ifdef CONFIG_IPV6
315 case RADIUS_ATTR_IPV6:
316 if (len == 16) {
6fc6879b
JM		 317 const char *atxt;
318 struct in6_addr *addr = (struct in6_addr *) pos;
319 atxt = inet_ntop(AF_INET6, addr, buf, sizeof(buf));
38ecb06e
JM		 320 wpa_printf(MSG_INFO, " Value: %s",
321 atxt ? atxt : "?");
322 } else {
323 wpa_printf(MSG_INFO, " Invalid IPv6 address length %d",
324 len);
325 }
6fc6879b
JM		 326 break;
327#endif /* CONFIG_IPV6 */
328
329 case RADIUS_ATTR_HEXDUMP:
330 case RADIUS_ATTR_UNDIST:
38ecb06e
JM		 331 wpa_snprintf_hex(buf, sizeof(buf), pos, len);
332 wpa_printf(MSG_INFO, " Value: %s", buf);
6fc6879b
JM		 333 break;
334
335 case RADIUS_ATTR_INT32:
336 if (len == 4)
38ecb06e
JM		 337 wpa_printf(MSG_INFO, " Value: %u",
338 WPA_GET_BE32(pos));
6fc6879b 339 else
38ecb06e
JM		 340 wpa_printf(MSG_INFO, " Invalid INT32 length %d",
341 len);
6fc6879b
JM		 342 break;
343
344 default:
345 break;
346 }
347}
348
349
350void radius_msg_dump(struct radius_msg *msg)
351{
352 size_t i;
353
38ecb06e
JM		 354 wpa_printf(MSG_INFO, "RADIUS message: code=%d (%s) identifier=%d length=%d",
355 msg->hdr->code, radius_code_string(msg->hdr->code),
356 msg->hdr->identifier, be_to_host16(msg->hdr->length));
6fc6879b
JM		 357
358 for (i = 0; i < msg->attr_used; i++) {
359 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
360 radius_msg_dump_attr(attr);
361 }
362}
363
364
7d02e641
JM		 365int radius_msg_finish(struct radius_msg *msg, const u8 *secret,
366 size_t secret_len)
6fc6879b
JM		 367{
368 if (secret) {
369 u8 auth[MD5_MAC_LEN];
370 struct radius_attr_hdr *attr;
371
372 os_memset(auth, 0, MD5_MAC_LEN);
373 attr = radius_msg_add_attr(msg,
374 RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
375 auth, MD5_MAC_LEN);
376 if (attr == NULL) {
aa235d2e
JM		 377 wpa_printf(MSG_WARNING, "RADIUS: Could not add "
378 "Message-Authenticator");
6fc6879b
JM		 379 return -1;
380 }
c50b0233 381 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
aa235d2e
JM		 382 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
383 wpabuf_len(msg->buf), (u8 *) (attr + 1));
6fc6879b 384 } else
c50b0233 385 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
6fc6879b 386
aa235d2e
JM		 387 if (wpabuf_len(msg->buf) > 0xffff) {
388 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
389 (unsigned long) wpabuf_len(msg->buf));
6fc6879b
JM		 390 return -1;
391 }
392 return 0;
393}
394
395
396int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret,
397 size_t secret_len, const u8 *req_authenticator)
398{
399 u8 auth[MD5_MAC_LEN];
400 struct radius_attr_hdr *attr;
401 const u8 *addr[4];
402 size_t len[4];
403
404 os_memset(auth, 0, MD5_MAC_LEN);
405 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
406 auth, MD5_MAC_LEN);
407 if (attr == NULL) {
38ecb06e 408 wpa_printf(MSG_ERROR, "WARNING: Could not add Message-Authenticator");
6fc6879b
JM		 409 return -1;
410 }
c50b0233 411 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
6fc6879b
JM		 412 os_memcpy(msg->hdr->authenticator, req_authenticator,
413 sizeof(msg->hdr->authenticator));
aa235d2e
JM		 414 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
415 wpabuf_len(msg->buf), (u8 *) (attr + 1));
6fc6879b
JM		 416
417 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
418 addr[0] = (u8 *) msg->hdr;
419 len[0] = 1 + 1 + 2;
420 addr[1] = req_authenticator;
421 len[1] = MD5_MAC_LEN;
aa235d2e
JM		 422 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
423 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
6fc6879b
JM		 424 addr[3] = secret;
425 len[3] = secret_len;
426 md5_vector(4, addr, len, msg->hdr->authenticator);
427
aa235d2e
JM		 428 if (wpabuf_len(msg->buf) > 0xffff) {
429 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
430 (unsigned long) wpabuf_len(msg->buf));
6fc6879b
JM		 431 return -1;
432 }
433 return 0;
434}
435
436
b031338c
JM		 437int radius_msg_finish_das_resp(struct radius_msg *msg, const u8 *secret,
438 size_t secret_len,
439 const struct radius_hdr *req_hdr)
440{
441 const u8 *addr[2];
442 size_t len[2];
443 u8 auth[MD5_MAC_LEN];
444 struct radius_attr_hdr *attr;
445
446 os_memset(auth, 0, MD5_MAC_LEN);
447 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
448 auth, MD5_MAC_LEN);
449 if (attr == NULL) {
450 wpa_printf(MSG_WARNING, "Could not add Message-Authenticator");
451 return -1;
452 }
453
c50b0233 454 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
b031338c
JM		 455 os_memcpy(msg->hdr->authenticator, req_hdr->authenticator, 16);
456 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
457 wpabuf_len(msg->buf), (u8 *) (attr + 1));
458
459 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
460 addr[0] = wpabuf_head_u8(msg->buf);
461 len[0] = wpabuf_len(msg->buf);
462 addr[1] = secret;
463 len[1] = secret_len;
464 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0)
465 return -1;
466
467 if (wpabuf_len(msg->buf) > 0xffff) {
468 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
469 (unsigned long) wpabuf_len(msg->buf));
470 return -1;
471 }
472 return 0;
473}
474
475
7d02e641 476void radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret,
6fc6879b
JM		 477 size_t secret_len)
478{
479 const u8 *addr[2];
480 size_t len[2];
481
c50b0233 482 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
6fc6879b 483 os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN);
aa235d2e
JM		 484 addr[0] = wpabuf_head(msg->buf);
485 len[0] = wpabuf_len(msg->buf);
6fc6879b
JM		 486 addr[1] = secret;
487 len[1] = secret_len;
488 md5_vector(2, addr, len, msg->hdr->authenticator);
489
aa235d2e
JM		 490 if (wpabuf_len(msg->buf) > 0xffff) {
491 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
492 (unsigned long) wpabuf_len(msg->buf));
6fc6879b
JM		 493 }
494}
495
496
a1dd890a
JM		 497void radius_msg_finish_acct_resp(struct radius_msg *msg, const u8 *secret,
498 size_t secret_len, const u8 *req_authenticator)
499{
500 const u8 *addr[2];
501 size_t len[2];
502
503 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf));
504 os_memcpy(msg->hdr->authenticator, req_authenticator, MD5_MAC_LEN);
505 addr[0] = wpabuf_head(msg->buf);
506 len[0] = wpabuf_len(msg->buf);
507 addr[1] = secret;
508 len[1] = secret_len;
509 md5_vector(2, addr, len, msg->hdr->authenticator);
510
511 if (wpabuf_len(msg->buf) > 0xffff) {
512 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
513 (unsigned long) wpabuf_len(msg->buf));
514 }
515}
516
517
b031338c
JM		 518int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret,
519 size_t secret_len)
520{
521 const u8 *addr[4];
522 size_t len[4];
523 u8 zero[MD5_MAC_LEN];
524 u8 hash[MD5_MAC_LEN];
525
526 os_memset(zero, 0, sizeof(zero));
527 addr[0] = (u8 *) msg->hdr;
528 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
529 addr[1] = zero;
530 len[1] = MD5_MAC_LEN;
531 addr[2] = (u8 *) (msg->hdr + 1);
532 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
533 addr[3] = secret;
534 len[3] = secret_len;
535 md5_vector(4, addr, len, hash);
c2371953 536 return os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0;
b031338c
JM		 537}
538
539
540int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret,
42d30e9e
NL		 541 size_t secret_len,
542 int require_message_authenticator)
b031338c
JM		 543{
544 const u8 *addr[4];
545 size_t len[4];
546 u8 zero[MD5_MAC_LEN];
547 u8 hash[MD5_MAC_LEN];
548 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
549 u8 orig_authenticator[16];
550
551 struct radius_attr_hdr *attr = NULL, *tmp;
552 size_t i;
553
554 os_memset(zero, 0, sizeof(zero));
555 addr[0] = (u8 *) msg->hdr;
556 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN;
557 addr[1] = zero;
558 len[1] = MD5_MAC_LEN;
559 addr[2] = (u8 *) (msg->hdr + 1);
560 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
561 addr[3] = secret;
562 len[3] = secret_len;
563 md5_vector(4, addr, len, hash);
c2371953 564 if (os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0)
b031338c
JM		 565 return 1;
566
567 for (i = 0; i < msg->attr_used; i++) {
568 tmp = radius_get_attr_hdr(msg, i);
569 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
570 if (attr != NULL) {
571 wpa_printf(MSG_WARNING, "Multiple "
572 "Message-Authenticator attributes "
573 "in RADIUS message");
574 return 1;
575 }
576 attr = tmp;
577 }
578 }
579
580 if (attr == NULL) {
42d30e9e
NL		 581 if (require_message_authenticator) {
582 wpa_printf(MSG_WARNING,
583 "Missing Message-Authenticator attribute in RADIUS message");
584 return 1;
585 }
b031338c
JM		 586 return 0;
587 }
588
589 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
590 os_memset(attr + 1, 0, MD5_MAC_LEN);
591 os_memcpy(orig_authenticator, msg->hdr->authenticator,
592 sizeof(orig_authenticator));
593 os_memset(msg->hdr->authenticator, 0,
594 sizeof(msg->hdr->authenticator));
595 hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
596 wpabuf_len(msg->buf), auth);
597 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
598 os_memcpy(msg->hdr->authenticator, orig_authenticator,
599 sizeof(orig_authenticator));
600
c2371953 601 return os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0;
b031338c
JM		 602}
603
604
6fc6879b
JM		 605static int radius_msg_add_attr_to_array(struct radius_msg *msg,
606 struct radius_attr_hdr *attr)
607{
608 if (msg->attr_used >= msg->attr_size) {
609 size_t *nattr_pos;
610 int nlen = msg->attr_size * 2;
611
067ffa26
JM		 612 nattr_pos = os_realloc_array(msg->attr_pos, nlen,
613 sizeof(*msg->attr_pos));
6fc6879b
JM		 614 if (nattr_pos == NULL)
615 return -1;
616
617 msg->attr_pos = nattr_pos;
618 msg->attr_size = nlen;
619 }
620
aa235d2e
JM		 621 msg->attr_pos[msg->attr_used++] =
622 (unsigned char *) attr - wpabuf_head_u8(msg->buf);
6fc6879b
JM		 623
624 return 0;
625}
626
627
628struct radius_attr_hdr *radius_msg_add_attr(struct radius_msg *msg, u8 type,
629 const u8 *data, size_t data_len)
630{
631 size_t buf_needed;
632 struct radius_attr_hdr *attr;
633
b9fd3c24
JM		 634 if (TEST_FAIL())
635 return NULL;
636
6fc6879b 637 if (data_len > RADIUS_MAX_ATTR_LEN) {
38ecb06e 638 wpa_printf(MSG_ERROR, "radius_msg_add_attr: too long attribute (%lu bytes)",
6fc6879b
JM		 639 (unsigned long) data_len);
640 return NULL;
641 }
642
aa235d2e 643 buf_needed = sizeof(*attr) + data_len;
6fc6879b 644
aa235d2e 645 if (wpabuf_tailroom(msg->buf) < buf_needed) {
6fc6879b 646 /* allocate more space for message buffer */
aa235d2e 647 if (wpabuf_resize(&msg->buf, buf_needed) < 0)
6fc6879b 648 return NULL;
aa235d2e 649 msg->hdr = wpabuf_mhead(msg->buf);
6fc6879b
JM		 650 }
651
aa235d2e 652 attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr));
6fc6879b
JM		 653 attr->type = type;
654 attr->length = sizeof(*attr) + data_len;
aa235d2e 655 wpabuf_put_data(msg->buf, data, data_len);
6fc6879b
JM		 656
657 if (radius_msg_add_attr_to_array(msg, attr))
658 return NULL;
659
660 return attr;
661}
662
663
9e7245bd
JM		 664/**
665 * radius_msg_parse - Parse a RADIUS message
666 * @data: RADIUS message to be parsed
667 * @len: Length of data buffer in octets
668 * Returns: Parsed RADIUS message or %NULL on failure
669 *
670 * This parses a RADIUS message and makes a copy of its data. The caller is
671 * responsible for freeing the returned data with radius_msg_free().
672 */
673struct radius_msg * radius_msg_parse(const u8 *data, size_t len)
6fc6879b
JM		 674{
675 struct radius_msg *msg;
676 struct radius_hdr *hdr;
677 struct radius_attr_hdr *attr;
678 size_t msg_len;
679 unsigned char *pos, *end;
680
681 if (data == NULL || len < sizeof(*hdr))
682 return NULL;
683
684 hdr = (struct radius_hdr *) data;
685
c50b0233 686 msg_len = be_to_host16(hdr->length);
6fc6879b 687 if (msg_len < sizeof(*hdr) || msg_len > len) {
9e7245bd 688 wpa_printf(MSG_INFO, "RADIUS: Invalid message length");
6fc6879b
JM		 689 return NULL;
690 }
691
692 if (msg_len < len) {
9e7245bd
JM		 693 wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after "
694 "RADIUS message", (unsigned long) len - msg_len);
6fc6879b
JM		 695 }
696
d94f86d8 697 msg = os_zalloc(sizeof(*msg));
6fc6879b
JM		 698 if (msg == NULL)
699 return NULL;
700
aa235d2e
JM		 701 msg->buf = wpabuf_alloc_copy(data, msg_len);
702 if (msg->buf == NULL || radius_msg_initialize(msg)) {
703 radius_msg_free(msg);
6fc6879b
JM		 704 return NULL;
705 }
aa235d2e 706 msg->hdr = wpabuf_mhead(msg->buf);
6fc6879b
JM		 707
708 /* parse attributes */
aa235d2e
JM		 709 pos = wpabuf_mhead_u8(msg->buf) + sizeof(struct radius_hdr);
710 end = wpabuf_mhead_u8(msg->buf) + wpabuf_len(msg->buf);
6fc6879b
JM		 711 while (pos < end) {
712 if ((size_t) (end - pos) < sizeof(*attr))
713 goto fail;
714
715 attr = (struct radius_attr_hdr *) pos;
716
de7fe64d 717 if (attr->length > end - pos || attr->length < sizeof(*attr))
6fc6879b
JM		 718 goto fail;
719
720 /* TODO: check that attr->length is suitable for attr->type */
721
722 if (radius_msg_add_attr_to_array(msg, attr))
723 goto fail;
724
725 pos += attr->length;
726 }
727
728 return msg;
729
730 fail:
731 radius_msg_free(msg);
6fc6879b
JM		 732 return NULL;
733}
734
735
736int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len)
737{
738 const u8 *pos = data;
739 size_t left = data_len;
740
741 while (left > 0) {
742 int len;
743 if (left > RADIUS_MAX_ATTR_LEN)
744 len = RADIUS_MAX_ATTR_LEN;
745 else
746 len = left;
747
748 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE,
749 pos, len))
750 return 0;
751
752 pos += len;
753 left -= len;
754 }
755
756 return 1;
757}
758
759
e100828b 760struct wpabuf * radius_msg_get_eap(struct radius_msg *msg)
6fc6879b 761{
e100828b 762 struct wpabuf *eap;
6fc6879b
JM		 763 size_t len, i;
764 struct radius_attr_hdr *attr;
765
766 if (msg == NULL)
767 return NULL;
768
769 len = 0;
770 for (i = 0; i < msg->attr_used; i++) {
771 attr = radius_get_attr_hdr(msg, i);
47e9d50d
JM		 772 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
773 attr->length > sizeof(struct radius_attr_hdr))
6fc6879b
JM		 774 len += attr->length - sizeof(struct radius_attr_hdr);
775 }
776
777 if (len == 0)
778 return NULL;
779
e100828b 780 eap = wpabuf_alloc(len);
6fc6879b
JM		 781 if (eap == NULL)
782 return NULL;
783
6fc6879b
JM		 784 for (i = 0; i < msg->attr_used; i++) {
785 attr = radius_get_attr_hdr(msg, i);
47e9d50d
JM		 786 if (attr->type == RADIUS_ATTR_EAP_MESSAGE &&
787 attr->length > sizeof(struct radius_attr_hdr)) {
6fc6879b 788 int flen = attr->length - sizeof(*attr);
e100828b 789 wpabuf_put_data(eap, attr + 1, flen);
6fc6879b
JM		 790 }
791 }
792
6fc6879b
JM		 793 return eap;
794}
795
796
797int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret,
798 size_t secret_len, const u8 *req_auth)
799{
800 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
801 u8 orig_authenticator[16];
802 struct radius_attr_hdr *attr = NULL, *tmp;
803 size_t i;
804
805 for (i = 0; i < msg->attr_used; i++) {
806 tmp = radius_get_attr_hdr(msg, i);
807 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
808 if (attr != NULL) {
38ecb06e 809 wpa_printf(MSG_INFO, "Multiple Message-Authenticator attributes in RADIUS message");
6fc6879b
JM		 810 return 1;
811 }
812 attr = tmp;
813 }
814 }
815
816 if (attr == NULL) {
38ecb06e 817 wpa_printf(MSG_INFO, "No Message-Authenticator attribute found");
6fc6879b
JM		 818 return 1;
819 }
820
821 os_memcpy(orig, attr + 1, MD5_MAC_LEN);
822 os_memset(attr + 1, 0, MD5_MAC_LEN);
823 if (req_auth) {
824 os_memcpy(orig_authenticator, msg->hdr->authenticator,
825 sizeof(orig_authenticator));
826 os_memcpy(msg->hdr->authenticator, req_auth,
827 sizeof(msg->hdr->authenticator));
828 }
38eee0f5
JM		 829 if (hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
830 wpabuf_len(msg->buf), auth) < 0)
831 return 1;
6fc6879b
JM		 832 os_memcpy(attr + 1, orig, MD5_MAC_LEN);
833 if (req_auth) {
834 os_memcpy(msg->hdr->authenticator, orig_authenticator,
835 sizeof(orig_authenticator));
836 }
837
c2371953 838 if (os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0) {
38ecb06e 839 wpa_printf(MSG_INFO, "Invalid Message-Authenticator!");
6fc6879b
JM		 840 return 1;
841 }
842
843 return 0;
844}
845
846
847int radius_msg_verify(struct radius_msg *msg, const u8 *secret,
848 size_t secret_len, struct radius_msg *sent_msg, int auth)
849{
850 const u8 *addr[4];
851 size_t len[4];
852 u8 hash[MD5_MAC_LEN];
853
854 if (sent_msg == NULL) {
38ecb06e 855 wpa_printf(MSG_INFO, "No matching Access-Request message found");
6fc6879b
JM		 856 return 1;
857 }
858
859 if (auth &&
860 radius_msg_verify_msg_auth(msg, secret, secret_len,
861 sent_msg->hdr->authenticator)) {
862 return 1;
863 }
864
865 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
866 addr[0] = (u8 *) msg->hdr;
867 len[0] = 1 + 1 + 2;
868 addr[1] = sent_msg->hdr->authenticator;
869 len[1] = MD5_MAC_LEN;
aa235d2e
JM		 870 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
871 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
6fc6879b
JM		 872 addr[3] = secret;
873 len[3] = secret_len;
05dad946
JM		 874 if (md5_vector(4, addr, len, hash) < 0 ||
875 os_memcmp_const(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) {
38ecb06e 876 wpa_printf(MSG_INFO, "Response Authenticator invalid!");
6fc6879b
JM		 877 return 1;
878 }
879
880 return 0;
881}
882
883
884int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src,
885 u8 type)
886{
887 struct radius_attr_hdr *attr;
888 size_t i;
889 int count = 0;
890
891 for (i = 0; i < src->attr_used; i++) {
892 attr = radius_get_attr_hdr(src, i);
47e9d50d 893 if (attr->type == type && attr->length >= sizeof(*attr)) {
6fc6879b
JM		 894 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1),
895 attr->length - sizeof(*attr)))
896 return -1;
897 count++;
898 }
899 }
900
901 return count;
902}
903
904
905/* Create Request Authenticator. The value should be unique over the lifetime
906 * of the shared secret between authenticator and authentication server.
2cbc6ffb
NL		 907 */
908int radius_msg_make_authenticator(struct radius_msg *msg)
6fc6879b 909{
2cbc6ffb
NL		 910 return os_get_random((u8 *) &msg->hdr->authenticator,
911 sizeof(msg->hdr->authenticator));
6fc6879b
JM		 912}
913
914
915/* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message.
916 * Returns the Attribute payload and sets alen to indicate the length of the
917 * payload if a vendor attribute with subtype is found, otherwise returns NULL.
918 * The returned payload is allocated with os_malloc() and caller must free it
919 * by calling os_free().
920 */
921static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor,
922 u8 subtype, size_t *alen)
923{
924 u8 *data, *pos;
925 size_t i, len;
926
927 if (msg == NULL)
928 return NULL;
929
930 for (i = 0; i < msg->attr_used; i++) {
931 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
932 size_t left;
933 u32 vendor_id;
934 struct radius_attr_vendor *vhdr;
935
47e9d50d
JM		 936 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC ||
937 attr->length < sizeof(*attr))
6fc6879b
JM		 938 continue;
939
940 left = attr->length - sizeof(*attr);
941 if (left < 4)
942 continue;
943
944 pos = (u8 *) (attr + 1);
945
946 os_memcpy(&vendor_id, pos, 4);
947 pos += 4;
948 left -= 4;
949
950 if (ntohl(vendor_id) != vendor)
951 continue;
952
953 while (left >= sizeof(*vhdr)) {
954 vhdr = (struct radius_attr_vendor *) pos;
955 if (vhdr->vendor_length > left ||
956 vhdr->vendor_length < sizeof(*vhdr)) {
6fc6879b
JM		 957 break;
958 }
959 if (vhdr->vendor_type != subtype) {
960 pos += vhdr->vendor_length;
961 left -= vhdr->vendor_length;
962 continue;
963 }
964
965 len = vhdr->vendor_length - sizeof(*vhdr);
966 data = os_malloc(len);
967 if (data == NULL)
968 return NULL;
969 os_memcpy(data, pos + sizeof(*vhdr), len);
970 if (alen)
971 *alen = len;
972 return data;
973 }
974 }
975
976 return NULL;
977}
978
979
980static u8 * decrypt_ms_key(const u8 *key, size_t len,
981 const u8 *req_authenticator,
982 const u8 *secret, size_t secret_len, size_t *reslen)
983{
984 u8 *plain, *ppos, *res;
985 const u8 *pos;
986 size_t left, plen;
987 u8 hash[MD5_MAC_LEN];
988 int i, first = 1;
989 const u8 *addr[3];
990 size_t elen[3];
991
992 /* key: 16-bit salt followed by encrypted key info */
993
400de9b1
BG		 994 if (len < 2 + 16) {
995 wpa_printf(MSG_DEBUG, "RADIUS: %s: Len is too small: %d",
996 __func__, (int) len);
6fc6879b 997 return NULL;
400de9b1 998 }
6fc6879b
JM		 999
1000 pos = key + 2;
1001 left = len - 2;
1002 if (left % 16) {
400de9b1 1003 wpa_printf(MSG_INFO, "RADIUS: Invalid ms key len %lu",
38ecb06e 1004 (unsigned long) left);
6fc6879b
JM		 1005 return NULL;
1006 }
1007
1008 plen = left;
1009 ppos = plain = os_malloc(plen);
1010 if (plain == NULL)
1011 return NULL;
380da72b 1012 plain[0] = 0;
6fc6879b
JM		 1013
1014 while (left > 0) {
1015 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1016 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1017
1018 addr[0] = secret;
1019 elen[0] = secret_len;
1020 if (first) {
1021 addr[1] = req_authenticator;
1022 elen[1] = MD5_MAC_LEN;
1023 addr[2] = key;
1024 elen[2] = 2; /* Salt */
1025 } else {
1026 addr[1] = pos - MD5_MAC_LEN;
1027 elen[1] = MD5_MAC_LEN;
1028 }
2c3d95c7
JM		 1029 if (md5_vector(first ? 3 : 2, addr, elen, hash) < 0) {
1030 os_free(plain);
1031 return NULL;
1032 }
6fc6879b
JM		 1033 first = 0;
1034
1035 for (i = 0; i < MD5_MAC_LEN; i++)
1036 *ppos++ = *pos++ ^ hash[i];
1037 left -= MD5_MAC_LEN;
1038 }
1039
380da72b 1040 if (plain[0] == 0 || plain[0] > plen - 1) {
400de9b1 1041 wpa_printf(MSG_INFO, "RADIUS: Failed to decrypt MPPE key");
6fc6879b
JM		 1042 os_free(plain);
1043 return NULL;
1044 }
1045
1046 res = os_malloc(plain[0]);
1047 if (res == NULL) {
1048 os_free(plain);
1049 return NULL;
1050 }
1051 os_memcpy(res, plain + 1, plain[0]);
1052 if (reslen)
1053 *reslen = plain[0];
1054 os_free(plain);
1055 return res;
1056}
1057
1058
1059static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt,
1060 const u8 *req_authenticator,
1061 const u8 *secret, size_t secret_len,
1062 u8 *ebuf, size_t *elen)
1063{
1064 int i, len, first = 1;
1065 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos;
1066 const u8 *addr[3];
1067 size_t _len[3];
1068
1069 WPA_PUT_BE16(saltbuf, salt);
1070
1071 len = 1 + key_len;
1072 if (len & 0x0f) {
1073 len = (len & 0xf0) + 16;
1074 }
1075 os_memset(ebuf, 0, len);
1076 ebuf[0] = key_len;
1077 os_memcpy(ebuf + 1, key, key_len);
1078
1079 *elen = len;
1080
1081 pos = ebuf;
1082 while (len > 0) {
1083 /* b(1) = MD5(Secret + Request-Authenticator + Salt)
1084 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
1085 addr[0] = secret;
1086 _len[0] = secret_len;
1087 if (first) {
1088 addr[1] = req_authenticator;
1089 _len[1] = MD5_MAC_LEN;
1090 addr[2] = saltbuf;
1091 _len[2] = sizeof(saltbuf);
1092 } else {
1093 addr[1] = pos - MD5_MAC_LEN;
1094 _len[1] = MD5_MAC_LEN;
1095 }
1096 md5_vector(first ? 3 : 2, addr, _len, hash);
1097 first = 0;
1098
1099 for (i = 0; i < MD5_MAC_LEN; i++)
1100 *pos++ ^= hash[i];
1101
1102 len -= MD5_MAC_LEN;
1103 }
1104}
1105
1106
1107struct radius_ms_mppe_keys *
1108radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
7d02e641 1109 const u8 *secret, size_t secret_len)
6fc6879b
JM		 1110{
1111 u8 *key;
1112 size_t keylen;
1113 struct radius_ms_mppe_keys *keys;
1114
1115 if (msg == NULL || sent_msg == NULL)
1116 return NULL;
1117
1118 keys = os_zalloc(sizeof(*keys));
1119 if (keys == NULL)
1120 return NULL;
1121
1122 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1123 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY,
1124 &keylen);
1125 if (key) {
1126 keys->send = decrypt_ms_key(key, keylen,
1127 sent_msg->hdr->authenticator,
1128 secret, secret_len,
1129 &keys->send_len);
400de9b1
BG		 1130 if (!keys->send) {
1131 wpa_printf(MSG_DEBUG,
1132 "RADIUS: Failed to decrypt send key");
1133 }
6fc6879b
JM		 1134 os_free(key);
1135 }
1136
1137 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
1138 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY,
1139 &keylen);
1140 if (key) {
1141 keys->recv = decrypt_ms_key(key, keylen,
1142 sent_msg->hdr->authenticator,
1143 secret, secret_len,
1144 &keys->recv_len);
400de9b1
BG		 1145 if (!keys->recv) {
1146 wpa_printf(MSG_DEBUG,
1147 "RADIUS: Failed to decrypt recv key");
1148 }
6fc6879b
JM		 1149 os_free(key);
1150 }
1151
1152 return keys;
1153}
1154
1155
1156struct radius_ms_mppe_keys *
1157radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
7d02e641 1158 const u8 *secret, size_t secret_len)
6fc6879b
JM		 1159{
1160 u8 *key;
1161 size_t keylen;
1162 struct radius_ms_mppe_keys *keys;
1163
1164 if (msg == NULL || sent_msg == NULL)
1165 return NULL;
1166
1167 keys = os_zalloc(sizeof(*keys));
1168 if (keys == NULL)
1169 return NULL;
1170
1171 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO,
1172 RADIUS_CISCO_AV_PAIR, &keylen);
1173 if (key && keylen == 51 &&
1174 os_memcmp(key, "leap:session-key=", 17) == 0) {
1175 keys->recv = decrypt_ms_key(key + 17, keylen - 17,
1176 sent_msg->hdr->authenticator,
1177 secret, secret_len,
1178 &keys->recv_len);
1179 }
1180 os_free(key);
1181
1182 return keys;
1183}
1184
1185
1186int radius_msg_add_mppe_keys(struct radius_msg *msg,
1187 const u8 *req_authenticator,
1188 const u8 *secret, size_t secret_len,
1189 const u8 *send_key, size_t send_key_len,
1190 const u8 *recv_key, size_t recv_key_len)
1191{
1192 struct radius_attr_hdr *attr;
1193 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT);
1194 u8 *buf;
1195 struct radius_attr_vendor *vhdr;
1196 u8 *pos;
1197 size_t elen;
1198 int hlen;
1199 u16 salt;
1200
1201 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2;
1202
1203 /* MS-MPPE-Send-Key */
1204 buf = os_malloc(hlen + send_key_len + 16);
1205 if (buf == NULL) {
1206 return 0;
1207 }
1208 pos = buf;
1209 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1210 pos += sizeof(vendor_id);
1211 vhdr = (struct radius_attr_vendor *) pos;
1212 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY;
1213 pos = (u8 *) (vhdr + 1);
e52a6989
AB		 1214 if (os_get_random((u8 *) &salt, sizeof(salt)) < 0) {
1215 os_free(buf);
c06c9099 1216 return 0;
e52a6989 1217 }
c06c9099 1218 salt |= 0x8000;
6fc6879b
JM		 1219 WPA_PUT_BE16(pos, salt);
1220 pos += 2;
1221 encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret,
1222 secret_len, pos, &elen);
1223 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1224
1225 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1226 buf, hlen + elen);
1227 os_free(buf);
1228 if (attr == NULL) {
1229 return 0;
1230 }
1231
1232 /* MS-MPPE-Recv-Key */
dea0d8ee 1233 buf = os_malloc(hlen + recv_key_len + 16);
6fc6879b
JM		 1234 if (buf == NULL) {
1235 return 0;
1236 }
1237 pos = buf;
1238 os_memcpy(pos, &vendor_id, sizeof(vendor_id));
1239 pos += sizeof(vendor_id);
1240 vhdr = (struct radius_attr_vendor *) pos;
1241 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY;
1242 pos = (u8 *) (vhdr + 1);
1243 salt ^= 1;
1244 WPA_PUT_BE16(pos, salt);
1245 pos += 2;
1246 encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret,
1247 secret_len, pos, &elen);
1248 vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
1249
1250 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1251 buf, hlen + elen);
1252 os_free(buf);
1253 if (attr == NULL) {
1254 return 0;
1255 }
1256
1257 return 1;
1258}
1259
1260
0dd100fb
JM		 1261int radius_msg_add_wfa(struct radius_msg *msg, u8 subtype, const u8 *data,
1262 size_t len)
1263{
1264 struct radius_attr_hdr *attr;
1265 u8 *buf, *pos;
1266 size_t alen;
1267
1268 alen = 4 + 2 + len;
1269 buf = os_malloc(alen);
1270 if (buf == NULL)
1271 return 0;
1272 pos = buf;
1273 WPA_PUT_BE32(pos, RADIUS_VENDOR_ID_WFA);
1274 pos += 4;
1275 *pos++ = subtype;
1276 *pos++ = 2 + len;
1277 os_memcpy(pos, data, len);
1278 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
1279 buf, alen);
1280 os_free(buf);
1281 if (attr == NULL)
1282 return 0;
1283
1284 return 1;
1285}
1286
1287
8943cc99
JM		 1288int radius_user_password_hide(struct radius_msg *msg,
1289 const u8 *data, size_t data_len,
1290 const u8 *secret, size_t secret_len,
1291 u8 *buf, size_t buf_len)
6fc6879b 1292{
8943cc99 1293 size_t padlen, i, pos;
6fc6879b
JM		 1294 const u8 *addr[2];
1295 size_t len[2];
1296 u8 hash[16];
1297
8943cc99
JM		 1298 if (data_len + 16 > buf_len)
1299 return -1;
6fc6879b
JM		 1300
1301 os_memcpy(buf, data, data_len);
6fc6879b
JM		 1302
1303 padlen = data_len % 16;
8943cc99 1304 if (padlen && data_len < buf_len) {
6fc6879b
JM		 1305 padlen = 16 - padlen;
1306 os_memset(buf + data_len, 0, padlen);
8943cc99
JM		 1307 buf_len = data_len + padlen;
1308 } else {
1309 buf_len = data_len;
6fc6879b
JM		 1310 }
1311
1312 addr[0] = secret;
1313 len[0] = secret_len;
1314 addr[1] = msg->hdr->authenticator;
1315 len[1] = 16;
1316 md5_vector(2, addr, len, hash);
1317
1318 for (i = 0; i < 16; i++)
1319 buf[i] ^= hash[i];
1320 pos = 16;
1321
1322 while (pos < buf_len) {
1323 addr[0] = secret;
1324 len[0] = secret_len;
1325 addr[1] = &buf[pos - 16];
1326 len[1] = 16;
1327 md5_vector(2, addr, len, hash);
1328
1329 for (i = 0; i < 16; i++)
1330 buf[pos + i] ^= hash[i];
1331
1332 pos += 16;
1333 }
1334
8943cc99
JM		 1335 return buf_len;
1336}
1337
1338
1339/* Add User-Password attribute to a RADIUS message and encrypt it as specified
1340 * in RFC 2865, Chap. 5.2 */
1341struct radius_attr_hdr *
1342radius_msg_add_attr_user_password(struct radius_msg *msg,
1343 const u8 *data, size_t data_len,
1344 const u8 *secret, size_t secret_len)
1345{
1346 u8 buf[128];
1347 int res;
1348
1349 res = radius_user_password_hide(msg, data, data_len,
1350 secret, secret_len, buf, sizeof(buf));
1351 if (res < 0)
1352 return NULL;
1353
6fc6879b 1354 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD,
8943cc99 1355 buf, res);
6fc6879b
JM		 1356}
1357
1358
1359int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len)
1360{
1361 struct radius_attr_hdr *attr = NULL, *tmp;
1362 size_t i, dlen;
1363
1364 for (i = 0; i < msg->attr_used; i++) {
1365 tmp = radius_get_attr_hdr(msg, i);
1366 if (tmp->type == type) {
1367 attr = tmp;
1368 break;
1369 }
1370 }
1371
47e9d50d 1372 if (!attr || attr->length < sizeof(*attr))
6fc6879b
JM		 1373 return -1;
1374
1375 dlen = attr->length - sizeof(*attr);
1376 if (buf)
1377 os_memcpy(buf, (attr + 1), dlen > len ? len : dlen);
1378 return dlen;
1379}
1380
1381
1382int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf,
1383 size_t *len, const u8 *start)
1384{
1385 size_t i;
1386 struct radius_attr_hdr *attr = NULL, *tmp;
1387
1388 for (i = 0; i < msg->attr_used; i++) {
1389 tmp = radius_get_attr_hdr(msg, i);
1390 if (tmp->type == type &&
1391 (start == NULL || (u8 *) tmp > start)) {
1392 attr = tmp;
1393 break;
1394 }
1395 }
1396
47e9d50d 1397 if (!attr || attr->length < sizeof(*attr))
6fc6879b
JM		 1398 return -1;
1399
1400 *buf = (u8 *) (attr + 1);
1401 *len = attr->length - sizeof(*attr);
1402 return 0;
1403}
1404
1405
1406int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len)
1407{
1408 size_t i;
1409 int count;
1410
1411 for (count = 0, i = 0; i < msg->attr_used; i++) {
1412 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
1413 if (attr->type == type &&
1414 attr->length >= sizeof(struct radius_attr_hdr) + min_len)
1415 count++;
1416 }
1417
1418 return count;
1419}
1420
1421
1422struct radius_tunnel_attrs {
1423 int tag_used;
1424 int type; /* Tunnel-Type */
1425 int medium_type; /* Tunnel-Medium-Type */
1426 int vlanid;
1427};
1428
1429
8e44c192
MB		 1430static int cmp_int(const void *a, const void *b)
1431{
1432 int x, y;
1433
1434 x = *((int *) a);
1435 y = *((int *) b);
1436 return (x - y);
1437}
1438
1439
6fc6879b
JM		 1440/**
1441 * radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information
8e44c192
MB		 1442 * The k tagged vlans found are sorted by vlan_id and stored in the first k
1443 * items of tagged.
1444 *
6fc6879b 1445 * @msg: RADIUS message
8e44c192
MB		 1446 * @untagged: Pointer to store untagged vid
1447 * @numtagged: Size of tagged
1448 * @tagged: Pointer to store tagged list
1449 *
1450 * Returns: 0 if neither tagged nor untagged configuration is found, 1 otherwise
6fc6879b 1451 */
8e44c192
MB		 1452int radius_msg_get_vlanid(struct radius_msg *msg, int *untagged, int numtagged,
1453 int *tagged)
6fc6879b
JM		 1454{
1455 struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun;
1456 size_t i;
1457 struct radius_attr_hdr *attr = NULL;
1458 const u8 *data;
1459 char buf[10];
1460 size_t dlen;
8e44c192 1461 int j, taggedidx = 0, vlan_id;
6fc6879b
JM		 1462
1463 os_memset(&tunnel, 0, sizeof(tunnel));
8e44c192
MB		 1464 for (j = 0; j < numtagged; j++)
1465 tagged[j] = 0;
1466 *untagged = 0;
6fc6879b
JM		 1467
1468 for (i = 0; i < msg->attr_used; i++) {
1469 attr = radius_get_attr_hdr(msg, i);
47e9d50d
JM		 1470 if (attr->length < sizeof(*attr))
1471 return -1;
6fc6879b
JM		 1472 data = (const u8 *) (attr + 1);
1473 dlen = attr->length - sizeof(*attr);
1474 if (attr->length < 3)
1475 continue;
1476 if (data[0] >= RADIUS_TUNNEL_TAGS)
1477 tun = &tunnel[0];
1478 else
1479 tun = &tunnel[data[0]];
1480
1481 switch (attr->type) {
1482 case RADIUS_ATTR_TUNNEL_TYPE:
1483 if (attr->length != 6)
1484 break;
1485 tun->tag_used++;
1486 tun->type = WPA_GET_BE24(data + 1);
1487 break;
1488 case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE:
1489 if (attr->length != 6)
1490 break;
1491 tun->tag_used++;
1492 tun->medium_type = WPA_GET_BE24(data + 1);
1493 break;
1494 case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID:
1495 if (data[0] < RADIUS_TUNNEL_TAGS) {
1496 data++;
1497 dlen--;
1498 }
1499 if (dlen >= sizeof(buf))
1500 break;
1501 os_memcpy(buf, data, dlen);
1502 buf[dlen] = '\0';
8e44c192
MB		 1503 vlan_id = atoi(buf);
1504 if (vlan_id <= 0)
1505 break;
6fc6879b 1506 tun->tag_used++;
8e44c192
MB		 1507 tun->vlanid = vlan_id;
1508 break;
1509 case RADIUS_ATTR_EGRESS_VLANID: /* RFC 4675 */
1510 if (attr->length != 6)
1511 break;
1512 vlan_id = WPA_GET_BE24(data + 1);
1513 if (vlan_id <= 0)
1514 break;
1515 if (data[0] == 0x32)
1516 *untagged = vlan_id;
1517 else if (data[0] == 0x31 && tagged &&
1518 taggedidx < numtagged)
1519 tagged[taggedidx++] = vlan_id;
6fc6879b
JM		 1520 break;
1521 }
1522 }
1523
8e44c192 1524 /* Use tunnel with the lowest tag for untagged VLAN id */
6fc6879b
JM		 1525 for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) {
1526 tun = &tunnel[i];
1527 if (tun->tag_used &&
1528 tun->type == RADIUS_TUNNEL_TYPE_VLAN &&
1529 tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 &&
8e44c192
MB		 1530 tun->vlanid > 0) {
1531 *untagged = tun->vlanid;
1532 break;
1533 }
6fc6879b
JM		 1534 }
1535
8e44c192
MB		 1536 if (taggedidx)
1537 qsort(tagged, taggedidx, sizeof(int), cmp_int);
1538
1539 if (*untagged > 0 || taggedidx)
1540 return 1;
3ffdeb7a 1541 return 0;
6fc6879b 1542}
010dc068
JM		 1543
1544
05ab9712
MB		 1545/**
1546 * radius_msg_get_tunnel_password - Parse RADIUS attribute Tunnel-Password
1547 * @msg: Received RADIUS message
1548 * @keylen: Length of returned password
1549 * @secret: RADIUS shared secret
1550 * @secret_len: Length of secret
1551 * @sent_msg: Sent RADIUS message
14e91947
MB		 1552 * @n: Number of password attribute to return (starting with 0)
1553 * Returns: Pointer to n-th password (free with os_free) or %NULL
05ab9712
MB		 1554 */
1555char * radius_msg_get_tunnel_password(struct radius_msg *msg, int *keylen,
1556 const u8 *secret, size_t secret_len,
14e91947 1557 struct radius_msg *sent_msg, size_t n)
05ab9712
MB		 1558{
1559 u8 *buf = NULL;
1560 size_t buflen;
1561 const u8 *salt;
1562 u8 *str;
1563 const u8 *addr[3];
1564 size_t len[3];
1565 u8 hash[16];
1566 u8 *pos;
14e91947 1567 size_t i, j = 0;
05ab9712
MB		 1568 struct radius_attr_hdr *attr;
1569 const u8 *data;
1570 size_t dlen;
1571 const u8 *fdata = NULL; /* points to found item */
1572 size_t fdlen = -1;
1573 char *ret = NULL;
1574
14e91947 1575 /* find n-th valid Tunnel-Password attribute */
05ab9712
MB		 1576 for (i = 0; i < msg->attr_used; i++) {
1577 attr = radius_get_attr_hdr(msg, i);
1578 if (attr == NULL ||
1579 attr->type != RADIUS_ATTR_TUNNEL_PASSWORD) {
1580 continue;
1581 }
1582 if (attr->length <= 5)
1583 continue;
1584 data = (const u8 *) (attr + 1);
1585 dlen = attr->length - sizeof(*attr);
1586 if (dlen <= 3 || dlen % 16 != 3)
1587 continue;
14e91947
MB		 1588 j++;
1589 if (j <= n)
05ab9712
MB		 1590 continue;
1591
1592 fdata = data;
1593 fdlen = dlen;
14e91947 1594 break;
05ab9712
MB		 1595 }
1596 if (fdata == NULL)
1597 goto out;
1598
1599 /* alloc writable memory for decryption */
1600 buf = os_malloc(fdlen);
1601 if (buf == NULL)
1602 goto out;
1603 os_memcpy(buf, fdata, fdlen);
1604 buflen = fdlen;
1605
1606 /* init pointers */
1607 salt = buf + 1;
1608 str = buf + 3;
1609
1610 /* decrypt blocks */
1611 pos = buf + buflen - 16; /* last block */
1612 while (pos >= str + 16) { /* all but the first block */
1613 addr[0] = secret;
1614 len[0] = secret_len;
1615 addr[1] = pos - 16;
1616 len[1] = 16;
1617 md5_vector(2, addr, len, hash);
1618
1619 for (i = 0; i < 16; i++)
1620 pos[i] ^= hash[i];
1621
1622 pos -= 16;
1623 }
1624
1625 /* decrypt first block */
1626 if (str != pos)
1627 goto out;
1628 addr[0] = secret;
1629 len[0] = secret_len;
1630 addr[1] = sent_msg->hdr->authenticator;
1631 len[1] = 16;
1632 addr[2] = salt;
1633 len[2] = 2;
1634 md5_vector(3, addr, len, hash);
1635
1636 for (i = 0; i < 16; i++)
1637 pos[i] ^= hash[i];
1638
1639 /* derive plaintext length from first subfield */
1640 *keylen = (unsigned char) str[0];
1641 if ((u8 *) (str + *keylen) >= (u8 *) (buf + buflen)) {
1642 /* decryption error - invalid key length */
1643 goto out;
1644 }
1645 if (*keylen == 0) {
1646 /* empty password */
1647 goto out;
1648 }
1649
1650 /* copy passphrase into new buffer */
1651 ret = os_malloc(*keylen);
1652 if (ret)
1653 os_memcpy(ret, str + 1, *keylen);
1654
1655out:
1656 /* return new buffer */
1657 os_free(buf);
1658 return ret;
1659}
1660
1661
010dc068
JM		 1662void radius_free_class(struct radius_class_data *c)
1663{
1664 size_t i;
1665 if (c == NULL)
1666 return;
1667 for (i = 0; i < c->count; i++)
1668 os_free(c->attr[i].data);
1669 os_free(c->attr);
1670 c->attr = NULL;
1671 c->count = 0;
1672}
1673
1674
1675int radius_copy_class(struct radius_class_data *dst,
1676 const struct radius_class_data *src)
1677{
1678 size_t i;
1679
1680 if (src->attr == NULL)
1681 return 0;
1682
f9884c09 1683 dst->attr = os_calloc(src->count, sizeof(struct radius_attr_data));
010dc068
JM		 1684 if (dst->attr == NULL)
1685 return -1;
1686
1687 dst->count = 0;
1688
1689 for (i = 0; i < src->count; i++) {
1690 dst->attr[i].data = os_malloc(src->attr[i].len);
1691 if (dst->attr[i].data == NULL)
1692 break;
1693 dst->count++;
1694 os_memcpy(dst->attr[i].data, src->attr[i].data,
1695 src->attr[i].len);
1696 dst->attr[i].len = src->attr[i].len;
1697 }
1698
1699 return 0;
1700}
fc2a924a
JM		 1701
1702
1703u8 radius_msg_find_unlisted_attr(struct radius_msg *msg, u8 *attrs)
1704{
1705 size_t i, j;
1706 struct radius_attr_hdr *attr;
1707
1708 for (i = 0; i < msg->attr_used; i++) {
1709 attr = radius_get_attr_hdr(msg, i);
1710
1711 for (j = 0; attrs[j]; j++) {
1712 if (attr->type == attrs[j])
1713 break;
1714 }
1715
1716 if (attrs[j] == 0)
1717 return attr->type; /* unlisted attr */
1718 }
1719
1720 return 0;
1721}
1fc63fe2
JM		 1722
1723
1724int radius_gen_session_id(u8 *id, size_t len)
1725{
1726 /*
1727 * Acct-Session-Id and Acct-Multi-Session-Id should be globally and
1728 * temporarily unique. A high quality random number is required
1729 * therefore. This could be be improved by switching to a GUID.
1730 */
1731 return os_get_random(id, len);
1732}
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