1 /*
2 * EAP peer method: EAP-FAST PAC file processing
3 * Copyright (c) 2004-2006, 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 "includes.h"
10
11 #include "common.h"
12 #include "eap_config.h"
13 #include "eap_i.h"
14 #include "eap_fast_pac.h"
15
16 /* TODO: encrypt PAC-Key in the PAC file */
17
18
19 /* Text data format */
20 static const char *pac_file_hdr =
21 "wpa_supplicant EAP-FAST PAC file - version 1";
22
23 /*
24 * Binary data format
25 * 4-octet magic value: 6A E4 92 0C
26 * 2-octet version (big endian)
27 * <version specific data>
28 *
29 * version=0:
30 * Sequence of PAC entries:
31 * 2-octet PAC-Type (big endian)
32 * 32-octet PAC-Key
33 * 2-octet PAC-Opaque length (big endian)
34 * <variable len> PAC-Opaque data (length bytes)
35 * 2-octet PAC-Info length (big endian)
36 * <variable len> PAC-Info data (length bytes)
37 */
38
39 #define EAP_FAST_PAC_BINARY_MAGIC 0x6ae4920c
40 #define EAP_FAST_PAC_BINARY_FORMAT_VERSION 0
41
42
43 /**
44 * eap_fast_free_pac - Free PAC data
45 * @pac: Pointer to the PAC entry
46 *
47 * Note that the PAC entry must not be in a list since this function does not
48 * remove the list links.
49 */
eap_fast_free_pac(struct eap_fast_pac * pac)50 void eap_fast_free_pac(struct eap_fast_pac *pac)
51 {
52 os_free(pac->pac_opaque);
53 os_free(pac->pac_info);
54 os_free(pac->a_id);
55 os_free(pac->i_id);
56 os_free(pac->a_id_info);
57 os_free(pac);
58 }
59
60
61 /**
62 * eap_fast_get_pac - Get a PAC entry based on A-ID
63 * @pac_root: Pointer to root of the PAC list
64 * @a_id: A-ID to search for
65 * @a_id_len: Length of A-ID
66 * @pac_type: PAC-Type to search for
67 * Returns: Pointer to the PAC entry, or %NULL if A-ID not found
68 */
eap_fast_get_pac(struct eap_fast_pac * pac_root,const u8 * a_id,size_t a_id_len,u16 pac_type)69 struct eap_fast_pac * eap_fast_get_pac(struct eap_fast_pac *pac_root,
70 const u8 *a_id, size_t a_id_len,
71 u16 pac_type)
72 {
73 struct eap_fast_pac *pac = pac_root;
74
75 while (pac) {
76 if (pac->pac_type == pac_type && pac->a_id_len == a_id_len &&
77 os_memcmp(pac->a_id, a_id, a_id_len) == 0) {
78 return pac;
79 }
80 pac = pac->next;
81 }
82 return NULL;
83 }
84
85
eap_fast_remove_pac(struct eap_fast_pac ** pac_root,struct eap_fast_pac ** pac_current,const u8 * a_id,size_t a_id_len,u16 pac_type)86 static void eap_fast_remove_pac(struct eap_fast_pac **pac_root,
87 struct eap_fast_pac **pac_current,
88 const u8 *a_id, size_t a_id_len, u16 pac_type)
89 {
90 struct eap_fast_pac *pac, *prev;
91
92 pac = *pac_root;
93 prev = NULL;
94
95 while (pac) {
96 if (pac->pac_type == pac_type && pac->a_id_len == a_id_len &&
97 os_memcmp(pac->a_id, a_id, a_id_len) == 0) {
98 if (prev == NULL)
99 *pac_root = pac->next;
100 else
101 prev->next = pac->next;
102 if (*pac_current == pac)
103 *pac_current = NULL;
104 eap_fast_free_pac(pac);
105 break;
106 }
107 prev = pac;
108 pac = pac->next;
109 }
110 }
111
112
eap_fast_copy_buf(u8 ** dst,size_t * dst_len,const u8 * src,size_t src_len)113 static int eap_fast_copy_buf(u8 **dst, size_t *dst_len,
114 const u8 *src, size_t src_len)
115 {
116 if (src) {
117 *dst = os_malloc(src_len);
118 if (*dst == NULL)
119 return -1;
120 os_memcpy(*dst, src, src_len);
121 *dst_len = src_len;
122 }
123 return 0;
124 }
125
126
127 /**
128 * eap_fast_add_pac - Add a copy of a PAC entry to a list
129 * @pac_root: Pointer to PAC list root pointer
130 * @pac_current: Pointer to the current PAC pointer
131 * @entry: New entry to clone and add to the list
132 * Returns: 0 on success, -1 on failure
133 *
134 * This function makes a clone of the given PAC entry and adds this copied
135 * entry to the list (pac_root). If an old entry for the same A-ID is found,
136 * it will be removed from the PAC list and in this case, pac_current entry
137 * is set to %NULL if it was the removed entry.
138 */
eap_fast_add_pac(struct eap_fast_pac ** pac_root,struct eap_fast_pac ** pac_current,struct eap_fast_pac * entry)139 int eap_fast_add_pac(struct eap_fast_pac **pac_root,
140 struct eap_fast_pac **pac_current,
141 struct eap_fast_pac *entry)
142 {
143 struct eap_fast_pac *pac;
144
145 if (entry == NULL || entry->a_id == NULL)
146 return -1;
147
148 /* Remove a possible old entry for the matching A-ID. */
149 eap_fast_remove_pac(pac_root, pac_current,
150 entry->a_id, entry->a_id_len, entry->pac_type);
151
152 /* Allocate a new entry and add it to the list of PACs. */
153 pac = os_zalloc(sizeof(*pac));
154 if (pac == NULL)
155 return -1;
156
157 pac->pac_type = entry->pac_type;
158 os_memcpy(pac->pac_key, entry->pac_key, EAP_FAST_PAC_KEY_LEN);
159 if (eap_fast_copy_buf(&pac->pac_opaque, &pac->pac_opaque_len,
160 entry->pac_opaque, entry->pac_opaque_len) < 0 ||
161 eap_fast_copy_buf(&pac->pac_info, &pac->pac_info_len,
162 entry->pac_info, entry->pac_info_len) < 0 ||
163 eap_fast_copy_buf(&pac->a_id, &pac->a_id_len,
164 entry->a_id, entry->a_id_len) < 0 ||
165 eap_fast_copy_buf(&pac->i_id, &pac->i_id_len,
166 entry->i_id, entry->i_id_len) < 0 ||
167 eap_fast_copy_buf(&pac->a_id_info, &pac->a_id_info_len,
168 entry->a_id_info, entry->a_id_info_len) < 0) {
169 eap_fast_free_pac(pac);
170 return -1;
171 }
172
173 pac->next = *pac_root;
174 *pac_root = pac;
175
176 return 0;
177 }
178
179
180 struct eap_fast_read_ctx {
181 FILE *f;
182 const char *pos;
183 const char *end;
184 int line;
185 char *buf;
186 size_t buf_len;
187 };
188
eap_fast_read_line(struct eap_fast_read_ctx * rc,char ** value)189 static int eap_fast_read_line(struct eap_fast_read_ctx *rc, char **value)
190 {
191 char *pos;
192
193 rc->line++;
194 if (rc->f) {
195 if (fgets(rc->buf, rc->buf_len, rc->f) == NULL)
196 return -1;
197 } else {
198 const char *l_end;
199 size_t len;
200 if (rc->pos >= rc->end)
201 return -1;
202 l_end = rc->pos;
203 while (l_end < rc->end && *l_end != '\n')
204 l_end++;
205 len = l_end - rc->pos;
206 if (len >= rc->buf_len)
207 len = rc->buf_len - 1;
208 os_memcpy(rc->buf, rc->pos, len);
209 rc->buf[len] = '\0';
210 rc->pos = l_end + 1;
211 }
212
213 rc->buf[rc->buf_len - 1] = '\0';
214 pos = rc->buf;
215 while (*pos != '\0') {
216 if (*pos == '\n' || *pos == '\r') {
217 *pos = '\0';
218 break;
219 }
220 pos++;
221 }
222
223 pos = os_strchr(rc->buf, '=');
224 if (pos)
225 *pos++ = '\0';
226 *value = pos;
227
228 return 0;
229 }
230
231
eap_fast_parse_hex(const char * value,size_t * len)232 static u8 * eap_fast_parse_hex(const char *value, size_t *len)
233 {
234 int hlen;
235 u8 *buf;
236
237 if (value == NULL)
238 return NULL;
239 hlen = os_strlen(value);
240 if (hlen & 1)
241 return NULL;
242 *len = hlen / 2;
243 buf = os_malloc(*len);
244 if (buf == NULL)
245 return NULL;
246 if (hexstr2bin(value, buf, *len)) {
247 os_free(buf);
248 return NULL;
249 }
250 return buf;
251 }
252
253
eap_fast_init_pac_data(struct eap_sm * sm,const char * pac_file,struct eap_fast_read_ctx * rc)254 static int eap_fast_init_pac_data(struct eap_sm *sm, const char *pac_file,
255 struct eap_fast_read_ctx *rc)
256 {
257 os_memset(rc, 0, sizeof(*rc));
258
259 rc->buf_len = 2048;
260 rc->buf = os_malloc(rc->buf_len);
261 if (rc->buf == NULL)
262 return -1;
263
264 if (os_strncmp(pac_file, "blob://", 7) == 0) {
265 const struct wpa_config_blob *blob;
266 blob = eap_get_config_blob(sm, pac_file + 7);
267 if (blob == NULL) {
268 wpa_printf(MSG_INFO, "EAP-FAST: No PAC blob '%s' - "
269 "assume no PAC entries have been "
270 "provisioned", pac_file + 7);
271 os_free(rc->buf);
272 return -1;
273 }
274 rc->pos = (char *) blob->data;
275 rc->end = (char *) blob->data + blob->len;
276 } else {
277 rc->f = fopen(pac_file, "rb");
278 if (rc->f == NULL) {
279 wpa_printf(MSG_INFO, "EAP-FAST: No PAC file '%s' - "
280 "assume no PAC entries have been "
281 "provisioned", pac_file);
282 os_free(rc->buf);
283 return -1;
284 }
285 }
286
287 return 0;
288 }
289
290
eap_fast_deinit_pac_data(struct eap_fast_read_ctx * rc)291 static void eap_fast_deinit_pac_data(struct eap_fast_read_ctx *rc)
292 {
293 os_free(rc->buf);
294 if (rc->f)
295 fclose(rc->f);
296 }
297
298
eap_fast_parse_start(struct eap_fast_pac ** pac)299 static const char * eap_fast_parse_start(struct eap_fast_pac **pac)
300 {
301 if (*pac)
302 return "START line without END";
303
304 *pac = os_zalloc(sizeof(struct eap_fast_pac));
305 if (*pac == NULL)
306 return "No memory for PAC entry";
307 (*pac)->pac_type = PAC_TYPE_TUNNEL_PAC;
308 return NULL;
309 }
310
311
eap_fast_parse_end(struct eap_fast_pac ** pac_root,struct eap_fast_pac ** pac)312 static const char * eap_fast_parse_end(struct eap_fast_pac **pac_root,
313 struct eap_fast_pac **pac)
314 {
315 if (*pac == NULL)
316 return "END line without START";
317 if (*pac_root) {
318 struct eap_fast_pac *end = *pac_root;
319 while (end->next)
320 end = end->next;
321 end->next = *pac;
322 } else
323 *pac_root = *pac;
324
325 *pac = NULL;
326 return NULL;
327 }
328
329
eap_fast_parse_pac_type(struct eap_fast_pac * pac,char * pos)330 static const char * eap_fast_parse_pac_type(struct eap_fast_pac *pac,
331 char *pos)
332 {
333 if (!pos)
334 return "Cannot parse pac type";
335 pac->pac_type = atoi(pos);
336 if (pac->pac_type != PAC_TYPE_TUNNEL_PAC &&
337 pac->pac_type != PAC_TYPE_USER_AUTHORIZATION &&
338 pac->pac_type != PAC_TYPE_MACHINE_AUTHENTICATION)
339 return "Unrecognized PAC-Type";
340
341 return NULL;
342 }
343
344
eap_fast_parse_pac_key(struct eap_fast_pac * pac,char * pos)345 static const char * eap_fast_parse_pac_key(struct eap_fast_pac *pac, char *pos)
346 {
347 u8 *key;
348 size_t key_len;
349
350 key = eap_fast_parse_hex(pos, &key_len);
351 if (key == NULL || key_len != EAP_FAST_PAC_KEY_LEN) {
352 os_free(key);
353 return "Invalid PAC-Key";
354 }
355
356 os_memcpy(pac->pac_key, key, EAP_FAST_PAC_KEY_LEN);
357 os_free(key);
358
359 return NULL;
360 }
361
362
eap_fast_parse_pac_opaque(struct eap_fast_pac * pac,char * pos)363 static const char * eap_fast_parse_pac_opaque(struct eap_fast_pac *pac,
364 char *pos)
365 {
366 os_free(pac->pac_opaque);
367 pac->pac_opaque = eap_fast_parse_hex(pos, &pac->pac_opaque_len);
368 if (pac->pac_opaque == NULL)
369 return "Invalid PAC-Opaque";
370 return NULL;
371 }
372
373
eap_fast_parse_a_id(struct eap_fast_pac * pac,char * pos)374 static const char * eap_fast_parse_a_id(struct eap_fast_pac *pac, char *pos)
375 {
376 os_free(pac->a_id);
377 pac->a_id = eap_fast_parse_hex(pos, &pac->a_id_len);
378 if (pac->a_id == NULL)
379 return "Invalid A-ID";
380 return NULL;
381 }
382
383
eap_fast_parse_i_id(struct eap_fast_pac * pac,char * pos)384 static const char * eap_fast_parse_i_id(struct eap_fast_pac *pac, char *pos)
385 {
386 os_free(pac->i_id);
387 pac->i_id = eap_fast_parse_hex(pos, &pac->i_id_len);
388 if (pac->i_id == NULL)
389 return "Invalid I-ID";
390 return NULL;
391 }
392
393
eap_fast_parse_a_id_info(struct eap_fast_pac * pac,char * pos)394 static const char * eap_fast_parse_a_id_info(struct eap_fast_pac *pac,
395 char *pos)
396 {
397 os_free(pac->a_id_info);
398 pac->a_id_info = eap_fast_parse_hex(pos, &pac->a_id_info_len);
399 if (pac->a_id_info == NULL)
400 return "Invalid A-ID-Info";
401 return NULL;
402 }
403
404
405 /**
406 * eap_fast_load_pac - Load PAC entries (text format)
407 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
408 * @pac_root: Pointer to root of the PAC list (to be filled)
409 * @pac_file: Name of the PAC file/blob to load
410 * Returns: 0 on success, -1 on failure
411 */
eap_fast_load_pac(struct eap_sm * sm,struct eap_fast_pac ** pac_root,const char * pac_file)412 int eap_fast_load_pac(struct eap_sm *sm, struct eap_fast_pac **pac_root,
413 const char *pac_file)
414 {
415 struct eap_fast_read_ctx rc;
416 struct eap_fast_pac *pac = NULL;
417 int count = 0;
418 char *pos;
419 const char *err = NULL;
420
421 if (pac_file == NULL)
422 return -1;
423
424 if (eap_fast_init_pac_data(sm, pac_file, &rc) < 0)
425 return 0;
426
427 if (eap_fast_read_line(&rc, &pos) < 0) {
428 /* empty file - assume it is fine to overwrite */
429 eap_fast_deinit_pac_data(&rc);
430 return 0;
431 }
432 if (os_strcmp(pac_file_hdr, rc.buf) != 0)
433 err = "Unrecognized header line";
434
435 while (!err && eap_fast_read_line(&rc, &pos) == 0) {
436 if (os_strcmp(rc.buf, "START") == 0)
437 err = eap_fast_parse_start(&pac);
438 else if (os_strcmp(rc.buf, "END") == 0) {
439 err = eap_fast_parse_end(pac_root, &pac);
440 count++;
441 } else if (!pac)
442 err = "Unexpected line outside START/END block";
443 else if (os_strcmp(rc.buf, "PAC-Type") == 0)
444 err = eap_fast_parse_pac_type(pac, pos);
445 else if (os_strcmp(rc.buf, "PAC-Key") == 0)
446 err = eap_fast_parse_pac_key(pac, pos);
447 else if (os_strcmp(rc.buf, "PAC-Opaque") == 0)
448 err = eap_fast_parse_pac_opaque(pac, pos);
449 else if (os_strcmp(rc.buf, "A-ID") == 0)
450 err = eap_fast_parse_a_id(pac, pos);
451 else if (os_strcmp(rc.buf, "I-ID") == 0)
452 err = eap_fast_parse_i_id(pac, pos);
453 else if (os_strcmp(rc.buf, "A-ID-Info") == 0)
454 err = eap_fast_parse_a_id_info(pac, pos);
455 }
456
457 if (pac) {
458 err = "PAC block not terminated with END";
459 eap_fast_free_pac(pac);
460 }
461
462 eap_fast_deinit_pac_data(&rc);
463
464 if (err) {
465 wpa_printf(MSG_INFO, "EAP-FAST: %s in '%s:%d'",
466 err, pac_file, rc.line);
467 return -1;
468 }
469
470 wpa_printf(MSG_DEBUG, "EAP-FAST: Read %d PAC entries from '%s'",
471 count, pac_file);
472
473 return 0;
474 }
475
476
eap_fast_write(char ** buf,char ** pos,size_t * buf_len,const char * field,const u8 * data,size_t len,int txt)477 static void eap_fast_write(char **buf, char **pos, size_t *buf_len,
478 const char *field, const u8 *data,
479 size_t len, int txt)
480 {
481 size_t i, need;
482 int ret;
483 char *end;
484
485 if (data == NULL || buf == NULL || *buf == NULL ||
486 pos == NULL || *pos == NULL || *pos < *buf)
487 return;
488
489 need = os_strlen(field) + len * 2 + 30;
490 if (txt)
491 need += os_strlen(field) + len + 20;
492
493 if (*pos - *buf + need > *buf_len) {
494 char *nbuf = os_realloc(*buf, *buf_len + need);
495 if (nbuf == NULL) {
496 os_free(*buf);
497 *buf = NULL;
498 return;
499 }
500 *pos = nbuf + (*pos - *buf);
501 *buf = nbuf;
502 *buf_len += need;
503 }
504 end = *buf + *buf_len;
505
506 ret = os_snprintf(*pos, end - *pos, "%s=", field);
507 if (os_snprintf_error(end - *pos, ret))
508 return;
509 *pos += ret;
510 *pos += wpa_snprintf_hex(*pos, end - *pos, data, len);
511 ret = os_snprintf(*pos, end - *pos, "\n");
512 if (os_snprintf_error(end - *pos, ret))
513 return;
514 *pos += ret;
515
516 if (txt) {
517 ret = os_snprintf(*pos, end - *pos, "%s-txt=", field);
518 if (os_snprintf_error(end - *pos, ret))
519 return;
520 *pos += ret;
521 for (i = 0; i < len; i++) {
522 ret = os_snprintf(*pos, end - *pos, "%c", data[i]);
523 if (os_snprintf_error(end - *pos, ret))
524 return;
525 *pos += ret;
526 }
527 ret = os_snprintf(*pos, end - *pos, "\n");
528 if (os_snprintf_error(end - *pos, ret))
529 return;
530 *pos += ret;
531 }
532 }
533
534
eap_fast_write_pac(struct eap_sm * sm,const char * pac_file,char * buf,size_t len)535 static int eap_fast_write_pac(struct eap_sm *sm, const char *pac_file,
536 char *buf, size_t len)
537 {
538 if (os_strncmp(pac_file, "blob://", 7) == 0) {
539 struct wpa_config_blob *blob;
540 blob = os_zalloc(sizeof(*blob));
541 if (blob == NULL)
542 return -1;
543 blob->data = (u8 *) buf;
544 blob->len = len;
545 buf = NULL;
546 blob->name = os_strdup(pac_file + 7);
547 if (blob->name == NULL) {
548 os_free(blob);
549 return -1;
550 }
551 eap_set_config_blob(sm, blob);
552 } else {
553 FILE *f;
554 f = fopen(pac_file, "wb");
555 if (f == NULL) {
556 wpa_printf(MSG_INFO, "EAP-FAST: Failed to open PAC "
557 "file '%s' for writing", pac_file);
558 return -1;
559 }
560 if (fwrite(buf, 1, len, f) != len) {
561 wpa_printf(MSG_INFO, "EAP-FAST: Failed to write all "
562 "PACs into '%s'", pac_file);
563 fclose(f);
564 return -1;
565 }
566 os_free(buf);
567 fclose(f);
568 }
569
570 return 0;
571 }
572
573
eap_fast_add_pac_data(struct eap_fast_pac * pac,char ** buf,char ** pos,size_t * buf_len)574 static int eap_fast_add_pac_data(struct eap_fast_pac *pac, char **buf,
575 char **pos, size_t *buf_len)
576 {
577 int ret;
578
579 ret = os_snprintf(*pos, *buf + *buf_len - *pos,
580 "START\nPAC-Type=%d\n", pac->pac_type);
581 if (os_snprintf_error(*buf + *buf_len - *pos, ret))
582 return -1;
583
584 *pos += ret;
585 eap_fast_write(buf, pos, buf_len, "PAC-Key",
586 pac->pac_key, EAP_FAST_PAC_KEY_LEN, 0);
587 eap_fast_write(buf, pos, buf_len, "PAC-Opaque",
588 pac->pac_opaque, pac->pac_opaque_len, 0);
589 eap_fast_write(buf, pos, buf_len, "PAC-Info",
590 pac->pac_info, pac->pac_info_len, 0);
591 eap_fast_write(buf, pos, buf_len, "A-ID",
592 pac->a_id, pac->a_id_len, 0);
593 eap_fast_write(buf, pos, buf_len, "I-ID",
594 pac->i_id, pac->i_id_len, 1);
595 eap_fast_write(buf, pos, buf_len, "A-ID-Info",
596 pac->a_id_info, pac->a_id_info_len, 1);
597 if (*buf == NULL) {
598 wpa_printf(MSG_DEBUG, "EAP-FAST: No memory for PAC "
599 "data");
600 return -1;
601 }
602 ret = os_snprintf(*pos, *buf + *buf_len - *pos, "END\n");
603 if (os_snprintf_error(*buf + *buf_len - *pos, ret))
604 return -1;
605 *pos += ret;
606
607 return 0;
608 }
609
610
611 /**
612 * eap_fast_save_pac - Save PAC entries (text format)
613 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
614 * @pac_root: Root of the PAC list
615 * @pac_file: Name of the PAC file/blob
616 * Returns: 0 on success, -1 on failure
617 */
eap_fast_save_pac(struct eap_sm * sm,struct eap_fast_pac * pac_root,const char * pac_file)618 int eap_fast_save_pac(struct eap_sm *sm, struct eap_fast_pac *pac_root,
619 const char *pac_file)
620 {
621 struct eap_fast_pac *pac;
622 int ret, count = 0;
623 char *buf, *pos;
624 size_t buf_len;
625
626 if (pac_file == NULL)
627 return -1;
628
629 buf_len = 1024;
630 pos = buf = os_malloc(buf_len);
631 if (buf == NULL)
632 return -1;
633
634 ret = os_snprintf(pos, buf + buf_len - pos, "%s\n", pac_file_hdr);
635 if (os_snprintf_error(buf + buf_len - pos, ret)) {
636 os_free(buf);
637 return -1;
638 }
639 pos += ret;
640
641 pac = pac_root;
642 while (pac) {
643 if (eap_fast_add_pac_data(pac, &buf, &pos, &buf_len)) {
644 os_free(buf);
645 return -1;
646 }
647 count++;
648 pac = pac->next;
649 }
650
651 if (eap_fast_write_pac(sm, pac_file, buf, pos - buf)) {
652 os_free(buf);
653 return -1;
654 }
655
656 wpa_printf(MSG_DEBUG, "EAP-FAST: Wrote %d PAC entries into '%s'",
657 count, pac_file);
658
659 return 0;
660 }
661
662
663 /**
664 * eap_fast_pac_list_truncate - Truncate a PAC list to the given length
665 * @pac_root: Root of the PAC list
666 * @max_len: Maximum length of the list (>= 1)
667 * Returns: Number of PAC entries removed
668 */
eap_fast_pac_list_truncate(struct eap_fast_pac * pac_root,size_t max_len)669 size_t eap_fast_pac_list_truncate(struct eap_fast_pac *pac_root,
670 size_t max_len)
671 {
672 struct eap_fast_pac *pac, *prev;
673 size_t count;
674
675 pac = pac_root;
676 prev = NULL;
677 count = 0;
678
679 while (pac) {
680 count++;
681 if (count > max_len)
682 break;
683 prev = pac;
684 pac = pac->next;
685 }
686
687 if (count <= max_len || prev == NULL)
688 return 0;
689
690 count = 0;
691 prev->next = NULL;
692
693 while (pac) {
694 prev = pac;
695 pac = pac->next;
696 eap_fast_free_pac(prev);
697 count++;
698 }
699
700 return count;
701 }
702
703
eap_fast_pac_get_a_id(struct eap_fast_pac * pac)704 static void eap_fast_pac_get_a_id(struct eap_fast_pac *pac)
705 {
706 u8 *pos, *end;
707 u16 type, len;
708
709 pos = pac->pac_info;
710 end = pos + pac->pac_info_len;
711
712 while (pos + 4 < end) {
713 type = WPA_GET_BE16(pos);
714 pos += 2;
715 len = WPA_GET_BE16(pos);
716 pos += 2;
717 if (len > (unsigned int) (end - pos))
718 break;
719
720 if (type == PAC_TYPE_A_ID) {
721 os_free(pac->a_id);
722 pac->a_id = os_malloc(len);
723 if (pac->a_id == NULL)
724 break;
725 os_memcpy(pac->a_id, pos, len);
726 pac->a_id_len = len;
727 }
728
729 if (type == PAC_TYPE_A_ID_INFO) {
730 os_free(pac->a_id_info);
731 pac->a_id_info = os_malloc(len);
732 if (pac->a_id_info == NULL)
733 break;
734 os_memcpy(pac->a_id_info, pos, len);
735 pac->a_id_info_len = len;
736 }
737
738 pos += len;
739 }
740 }
741
742
743 /**
744 * eap_fast_load_pac_bin - Load PAC entries (binary format)
745 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
746 * @pac_root: Pointer to root of the PAC list (to be filled)
747 * @pac_file: Name of the PAC file/blob to load
748 * Returns: 0 on success, -1 on failure
749 */
eap_fast_load_pac_bin(struct eap_sm * sm,struct eap_fast_pac ** pac_root,const char * pac_file)750 int eap_fast_load_pac_bin(struct eap_sm *sm, struct eap_fast_pac **pac_root,
751 const char *pac_file)
752 {
753 const struct wpa_config_blob *blob = NULL;
754 u8 *buf, *end, *pos;
755 size_t len, count = 0;
756 struct eap_fast_pac *pac, *prev;
757
758 *pac_root = NULL;
759
760 if (pac_file == NULL)
761 return -1;
762
763 if (os_strncmp(pac_file, "blob://", 7) == 0) {
764 blob = eap_get_config_blob(sm, pac_file + 7);
765 if (blob == NULL) {
766 wpa_printf(MSG_INFO, "EAP-FAST: No PAC blob '%s' - "
767 "assume no PAC entries have been "
768 "provisioned", pac_file + 7);
769 return 0;
770 }
771 buf = blob->data;
772 len = blob->len;
773 } else {
774 buf = (u8 *) os_readfile(pac_file, &len);
775 if (buf == NULL) {
776 wpa_printf(MSG_INFO, "EAP-FAST: No PAC file '%s' - "
777 "assume no PAC entries have been "
778 "provisioned", pac_file);
779 return 0;
780 }
781 }
782
783 if (len == 0) {
784 if (blob == NULL)
785 os_free(buf);
786 return 0;
787 }
788
789 if (len < 6 || WPA_GET_BE32(buf) != EAP_FAST_PAC_BINARY_MAGIC ||
790 WPA_GET_BE16(buf + 4) != EAP_FAST_PAC_BINARY_FORMAT_VERSION) {
791 wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC file '%s' (bin)",
792 pac_file);
793 if (blob == NULL)
794 os_free(buf);
795 return -1;
796 }
797
798 pac = prev = NULL;
799 pos = buf + 6;
800 end = buf + len;
801 while (pos < end) {
802 u16 val;
803
804 if (end - pos < 2 + EAP_FAST_PAC_KEY_LEN + 2 + 2)
805 goto parse_fail;
806
807 pac = os_zalloc(sizeof(*pac));
808 if (pac == NULL)
809 goto parse_fail;
810
811 pac->pac_type = WPA_GET_BE16(pos);
812 pos += 2;
813 os_memcpy(pac->pac_key, pos, EAP_FAST_PAC_KEY_LEN);
814 pos += EAP_FAST_PAC_KEY_LEN;
815 val = WPA_GET_BE16(pos);
816 pos += 2;
817 if (val > end - pos)
818 goto parse_fail;
819 pac->pac_opaque_len = val;
820 pac->pac_opaque = os_malloc(pac->pac_opaque_len);
821 if (pac->pac_opaque == NULL)
822 goto parse_fail;
823 os_memcpy(pac->pac_opaque, pos, pac->pac_opaque_len);
824 pos += pac->pac_opaque_len;
825 if (2 > end - pos)
826 goto parse_fail;
827 val = WPA_GET_BE16(pos);
828 pos += 2;
829 if (val > end - pos)
830 goto parse_fail;
831 pac->pac_info_len = val;
832 pac->pac_info = os_malloc(pac->pac_info_len);
833 if (pac->pac_info == NULL)
834 goto parse_fail;
835 os_memcpy(pac->pac_info, pos, pac->pac_info_len);
836 pos += pac->pac_info_len;
837 eap_fast_pac_get_a_id(pac);
838
839 count++;
840 if (prev)
841 prev->next = pac;
842 else
843 *pac_root = pac;
844 prev = pac;
845 }
846
847 if (blob == NULL)
848 os_free(buf);
849
850 wpa_printf(MSG_DEBUG, "EAP-FAST: Read %lu PAC entries from '%s' (bin)",
851 (unsigned long) count, pac_file);
852
853 return 0;
854
855 parse_fail:
856 wpa_printf(MSG_INFO, "EAP-FAST: Failed to parse PAC file '%s' (bin)",
857 pac_file);
858 if (blob == NULL)
859 os_free(buf);
860 if (pac)
861 eap_fast_free_pac(pac);
862 return -1;
863 }
864
865
866 /**
867 * eap_fast_save_pac_bin - Save PAC entries (binary format)
868 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
869 * @pac_root: Root of the PAC list
870 * @pac_file: Name of the PAC file/blob
871 * Returns: 0 on success, -1 on failure
872 */
eap_fast_save_pac_bin(struct eap_sm * sm,struct eap_fast_pac * pac_root,const char * pac_file)873 int eap_fast_save_pac_bin(struct eap_sm *sm, struct eap_fast_pac *pac_root,
874 const char *pac_file)
875 {
876 size_t len, count = 0;
877 struct eap_fast_pac *pac;
878 u8 *buf, *pos;
879
880 len = 6;
881 pac = pac_root;
882 while (pac) {
883 if (pac->pac_opaque_len > 65535 ||
884 pac->pac_info_len > 65535)
885 return -1;
886 len += 2 + EAP_FAST_PAC_KEY_LEN + 2 + pac->pac_opaque_len +
887 2 + pac->pac_info_len;
888 pac = pac->next;
889 }
890
891 buf = os_malloc(len);
892 if (buf == NULL)
893 return -1;
894
895 pos = buf;
896 WPA_PUT_BE32(pos, EAP_FAST_PAC_BINARY_MAGIC);
897 pos += 4;
898 WPA_PUT_BE16(pos, EAP_FAST_PAC_BINARY_FORMAT_VERSION);
899 pos += 2;
900
901 pac = pac_root;
902 while (pac) {
903 WPA_PUT_BE16(pos, pac->pac_type);
904 pos += 2;
905 os_memcpy(pos, pac->pac_key, EAP_FAST_PAC_KEY_LEN);
906 pos += EAP_FAST_PAC_KEY_LEN;
907 WPA_PUT_BE16(pos, pac->pac_opaque_len);
908 pos += 2;
909 os_memcpy(pos, pac->pac_opaque, pac->pac_opaque_len);
910 pos += pac->pac_opaque_len;
911 WPA_PUT_BE16(pos, pac->pac_info_len);
912 pos += 2;
913 os_memcpy(pos, pac->pac_info, pac->pac_info_len);
914 pos += pac->pac_info_len;
915
916 pac = pac->next;
917 count++;
918 }
919
920 if (eap_fast_write_pac(sm, pac_file, (char *) buf, len)) {
921 os_free(buf);
922 return -1;
923 }
924
925 wpa_printf(MSG_DEBUG, "EAP-FAST: Wrote %lu PAC entries into '%s' "
926 "(bin)", (unsigned long) count, pac_file);
927
928 return 0;
929 }
930