1 /*
2 * WPA Supplicant / privileged helper program
3 * Copyright (c) 2007-2009, 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 #ifdef __linux__
11 #include <fcntl.h>
12 #endif /* __linux__ */
13 #include <sys/un.h>
14 #include <sys/stat.h>
15
16 #include "common.h"
17 #include "eloop.h"
18 #include "common/version.h"
19 #include "drivers/driver.h"
20 #include "l2_packet/l2_packet.h"
21 #include "common/privsep_commands.h"
22 #include "common/ieee802_11_defs.h"
23
24 #define WPA_PRIV_MAX_L2 3
25
26 struct wpa_priv_interface {
27 struct wpa_priv_interface *next;
28 char *driver_name;
29 char *ifname;
30 char *sock_name;
31 int fd;
32
33 void *ctx;
34
35 const struct wpa_driver_ops *driver;
36 void *drv_priv;
37 void *drv_global_priv;
38 struct sockaddr_un drv_addr;
39 socklen_t drv_addr_len;
40 int wpas_registered;
41
42 struct l2_packet_data *l2[WPA_PRIV_MAX_L2];
43 struct sockaddr_un l2_addr[WPA_PRIV_MAX_L2];
44 socklen_t l2_addr_len[WPA_PRIV_MAX_L2];
45 struct wpa_priv_l2 {
46 struct wpa_priv_interface *parent;
47 int idx;
48 } l2_ctx[WPA_PRIV_MAX_L2];
49 };
50
51 struct wpa_priv_global {
52 struct wpa_priv_interface *interfaces;
53 };
54
55
wpa_priv_cmd_register(struct wpa_priv_interface * iface,struct sockaddr_un * from,socklen_t fromlen)56 static void wpa_priv_cmd_register(struct wpa_priv_interface *iface,
57 struct sockaddr_un *from, socklen_t fromlen)
58 {
59 int i;
60
61 if (iface->drv_priv) {
62 wpa_printf(MSG_DEBUG, "Cleaning up forgotten driver instance");
63 if (iface->driver->deinit)
64 iface->driver->deinit(iface->drv_priv);
65 iface->drv_priv = NULL;
66 if (iface->drv_global_priv) {
67 iface->driver->global_deinit(iface->drv_global_priv);
68 iface->drv_global_priv = NULL;
69 }
70 iface->wpas_registered = 0;
71 }
72
73 for (i = 0; i < WPA_PRIV_MAX_L2; i++) {
74 if (iface->l2[i]) {
75 wpa_printf(MSG_DEBUG,
76 "Cleaning up forgotten l2_packet instance");
77 l2_packet_deinit(iface->l2[i]);
78 iface->l2[i] = NULL;
79 }
80 }
81
82 if (iface->driver->init2) {
83 if (iface->driver->global_init) {
84 iface->drv_global_priv =
85 iface->driver->global_init(iface->ctx);
86 if (!iface->drv_global_priv) {
87 wpa_printf(MSG_INFO,
88 "Failed to initialize driver global context");
89 return;
90 }
91 } else {
92 iface->drv_global_priv = NULL;
93 }
94 iface->drv_priv = iface->driver->init2(iface, iface->ifname,
95 iface->drv_global_priv);
96 } else if (iface->driver->init) {
97 iface->drv_priv = iface->driver->init(iface, iface->ifname);
98 } else {
99 return;
100 }
101 if (iface->drv_priv == NULL) {
102 wpa_printf(MSG_DEBUG, "Failed to initialize driver wrapper");
103 return;
104 }
105
106 wpa_printf(MSG_DEBUG, "Driver wrapper '%s' initialized for interface "
107 "'%s'", iface->driver_name, iface->ifname);
108
109 os_memcpy(&iface->drv_addr, from, fromlen);
110 iface->drv_addr_len = fromlen;
111 iface->wpas_registered = 1;
112
113 if (iface->driver->set_param &&
114 iface->driver->set_param(iface->drv_priv, NULL) < 0) {
115 wpa_printf(MSG_ERROR, "Driver interface rejected param");
116 }
117 }
118
119
wpa_priv_cmd_unregister(struct wpa_priv_interface * iface,struct sockaddr_un * from)120 static void wpa_priv_cmd_unregister(struct wpa_priv_interface *iface,
121 struct sockaddr_un *from)
122 {
123 if (iface->drv_priv) {
124 if (iface->driver->deinit)
125 iface->driver->deinit(iface->drv_priv);
126 iface->drv_priv = NULL;
127 if (iface->drv_global_priv) {
128 iface->driver->global_deinit(iface->drv_global_priv);
129 iface->drv_global_priv = NULL;
130 }
131 iface->wpas_registered = 0;
132 }
133 }
134
135
wpa_priv_cmd_scan(struct wpa_priv_interface * iface,void * buf,size_t len)136 static void wpa_priv_cmd_scan(struct wpa_priv_interface *iface,
137 void *buf, size_t len)
138 {
139 struct wpa_driver_scan_params params;
140 struct privsep_cmd_scan *scan;
141 unsigned int i;
142 int freqs[PRIVSEP_MAX_SCAN_FREQS + 1];
143
144 if (iface->drv_priv == NULL)
145 return;
146
147 if (len < sizeof(*scan)) {
148 wpa_printf(MSG_DEBUG, "Invalid scan request");
149 return;
150 }
151
152 scan = buf;
153
154 os_memset(¶ms, 0, sizeof(params));
155 if (scan->num_ssids > WPAS_MAX_SCAN_SSIDS) {
156 wpa_printf(MSG_DEBUG, "Invalid scan request (num_ssids)");
157 return;
158 }
159 params.num_ssids = scan->num_ssids;
160 for (i = 0; i < scan->num_ssids; i++) {
161 params.ssids[i].ssid = scan->ssids[i];
162 params.ssids[i].ssid_len = scan->ssid_lens[i];
163 }
164
165 if (scan->num_freqs > PRIVSEP_MAX_SCAN_FREQS) {
166 wpa_printf(MSG_DEBUG, "Invalid scan request (num_freqs)");
167 return;
168 }
169 if (scan->num_freqs) {
170 for (i = 0; i < scan->num_freqs; i++)
171 freqs[i] = scan->freqs[i];
172 freqs[i] = 0;
173 params.freqs = freqs;
174 }
175
176 if (iface->driver->scan2)
177 iface->driver->scan2(iface->drv_priv, ¶ms);
178 }
179
180
wpa_priv_get_scan_results2(struct wpa_priv_interface * iface,struct sockaddr_un * from,socklen_t fromlen)181 static void wpa_priv_get_scan_results2(struct wpa_priv_interface *iface,
182 struct sockaddr_un *from,
183 socklen_t fromlen)
184 {
185 struct wpa_scan_results *res;
186 u8 *buf = NULL, *pos, *end;
187 int val;
188 size_t i;
189
190 res = iface->driver->get_scan_results2(iface->drv_priv);
191 if (res == NULL)
192 goto fail;
193
194 buf = os_malloc(60000);
195 if (buf == NULL)
196 goto fail;
197 pos = buf;
198 end = buf + 60000;
199 val = res->num;
200 os_memcpy(pos, &val, sizeof(int));
201 pos += sizeof(int);
202
203 for (i = 0; i < res->num; i++) {
204 struct wpa_scan_res *r = res->res[i];
205 val = sizeof(*r) + r->ie_len + r->beacon_ie_len;
206 if (end - pos < (int) sizeof(int) + val)
207 break;
208 os_memcpy(pos, &val, sizeof(int));
209 pos += sizeof(int);
210 os_memcpy(pos, r, val);
211 pos += val;
212 }
213
214 sendto(iface->fd, buf, pos - buf, 0, (struct sockaddr *) from, fromlen);
215
216 os_free(buf);
217 wpa_scan_results_free(res);
218 return;
219
220 fail:
221 os_free(buf);
222 wpa_scan_results_free(res);
223 sendto(iface->fd, "", 0, 0, (struct sockaddr *) from, fromlen);
224 }
225
226
wpa_priv_cmd_get_scan_results(struct wpa_priv_interface * iface,struct sockaddr_un * from,socklen_t fromlen)227 static void wpa_priv_cmd_get_scan_results(struct wpa_priv_interface *iface,
228 struct sockaddr_un *from,
229 socklen_t fromlen)
230 {
231 if (iface->drv_priv == NULL)
232 return;
233
234 if (iface->driver->get_scan_results2)
235 wpa_priv_get_scan_results2(iface, from, fromlen);
236 else
237 sendto(iface->fd, "", 0, 0, (struct sockaddr *) from, fromlen);
238 }
239
240
wpa_priv_cmd_authenticate(struct wpa_priv_interface * iface,void * buf,size_t len)241 static void wpa_priv_cmd_authenticate(struct wpa_priv_interface *iface,
242 void *buf, size_t len)
243 {
244 struct wpa_driver_auth_params params;
245 struct privsep_cmd_authenticate *auth;
246 int res, i;
247
248 if (iface->drv_priv == NULL || iface->driver->authenticate == NULL)
249 return;
250
251 if (len < sizeof(*auth)) {
252 wpa_printf(MSG_DEBUG, "Invalid authentication request");
253 return;
254 }
255
256 auth = buf;
257 if (sizeof(*auth) + auth->ie_len + auth->auth_data_len > len) {
258 wpa_printf(MSG_DEBUG, "Authentication request overflow");
259 return;
260 }
261
262 os_memset(¶ms, 0, sizeof(params));
263 params.freq = auth->freq;
264 params.bssid = auth->bssid;
265 params.ssid = auth->ssid;
266 if (auth->ssid_len > SSID_MAX_LEN)
267 return;
268 params.ssid_len = auth->ssid_len;
269 params.auth_alg = auth->auth_alg;
270 for (i = 0; i < 4; i++) {
271 if (auth->wep_key_len[i]) {
272 params.wep_key[i] = auth->wep_key[i];
273 params.wep_key_len[i] = auth->wep_key_len[i];
274 }
275 }
276 params.wep_tx_keyidx = auth->wep_tx_keyidx;
277 params.local_state_change = auth->local_state_change;
278 params.p2p = auth->p2p;
279 if (auth->ie_len) {
280 params.ie = (u8 *) (auth + 1);
281 params.ie_len = auth->ie_len;
282 }
283 if (auth->auth_data_len) {
284 params.auth_data = ((u8 *) (auth + 1)) + auth->ie_len;
285 params.auth_data_len = auth->auth_data_len;
286 }
287
288 res = iface->driver->authenticate(iface->drv_priv, ¶ms);
289 wpa_printf(MSG_DEBUG, "drv->authenticate: res=%d", res);
290 }
291
292
wpa_priv_cmd_associate(struct wpa_priv_interface * iface,void * buf,size_t len)293 static void wpa_priv_cmd_associate(struct wpa_priv_interface *iface,
294 void *buf, size_t len)
295 {
296 struct wpa_driver_associate_params params;
297 struct privsep_cmd_associate *assoc;
298 u8 *bssid;
299 int res;
300
301 if (iface->drv_priv == NULL || iface->driver->associate == NULL)
302 return;
303
304 if (len < sizeof(*assoc)) {
305 wpa_printf(MSG_DEBUG, "Invalid association request");
306 return;
307 }
308
309 assoc = buf;
310 if (sizeof(*assoc) + assoc->wpa_ie_len > len) {
311 wpa_printf(MSG_DEBUG, "Association request overflow");
312 return;
313 }
314
315 os_memset(¶ms, 0, sizeof(params));
316 bssid = assoc->bssid;
317 if (bssid[0] | bssid[1] | bssid[2] | bssid[3] | bssid[4] | bssid[5])
318 params.bssid = bssid;
319 params.ssid = assoc->ssid;
320 if (assoc->ssid_len > SSID_MAX_LEN)
321 return;
322 params.ssid_len = assoc->ssid_len;
323 params.freq.mode = assoc->hwmode;
324 params.freq.freq = assoc->freq;
325 params.freq.channel = assoc->channel;
326 if (assoc->wpa_ie_len) {
327 params.wpa_ie = (u8 *) (assoc + 1);
328 params.wpa_ie_len = assoc->wpa_ie_len;
329 }
330 params.pairwise_suite = assoc->pairwise_suite;
331 params.group_suite = assoc->group_suite;
332 params.key_mgmt_suite = assoc->key_mgmt_suite;
333 params.auth_alg = assoc->auth_alg;
334 params.mode = assoc->mode;
335
336 res = iface->driver->associate(iface->drv_priv, ¶ms);
337 wpa_printf(MSG_DEBUG, "drv->associate: res=%d", res);
338 }
339
340
wpa_priv_cmd_get_bssid(struct wpa_priv_interface * iface,struct sockaddr_un * from,socklen_t fromlen)341 static void wpa_priv_cmd_get_bssid(struct wpa_priv_interface *iface,
342 struct sockaddr_un *from, socklen_t fromlen)
343 {
344 u8 bssid[ETH_ALEN];
345
346 if (iface->drv_priv == NULL)
347 goto fail;
348
349 if (iface->driver->get_bssid == NULL ||
350 iface->driver->get_bssid(iface->drv_priv, bssid) < 0)
351 goto fail;
352
353 sendto(iface->fd, bssid, ETH_ALEN, 0, (struct sockaddr *) from,
354 fromlen);
355 return;
356
357 fail:
358 sendto(iface->fd, "", 0, 0, (struct sockaddr *) from, fromlen);
359 }
360
361
wpa_priv_cmd_get_ssid(struct wpa_priv_interface * iface,struct sockaddr_un * from,socklen_t fromlen)362 static void wpa_priv_cmd_get_ssid(struct wpa_priv_interface *iface,
363 struct sockaddr_un *from, socklen_t fromlen)
364 {
365 u8 ssid[sizeof(int) + SSID_MAX_LEN];
366 int res;
367
368 if (iface->drv_priv == NULL)
369 goto fail;
370
371 if (iface->driver->get_ssid == NULL)
372 goto fail;
373
374 os_memset(ssid, 0, sizeof(ssid));
375 res = iface->driver->get_ssid(iface->drv_priv, &ssid[sizeof(int)]);
376 if (res < 0 || res > SSID_MAX_LEN)
377 goto fail;
378 os_memcpy(ssid, &res, sizeof(int));
379
380 sendto(iface->fd, ssid, sizeof(ssid), 0, (struct sockaddr *) from,
381 fromlen);
382 return;
383
384 fail:
385 sendto(iface->fd, "", 0, 0, (struct sockaddr *) from, fromlen);
386 }
387
388
wpa_priv_cmd_set_key(struct wpa_priv_interface * iface,void * buf,size_t len)389 static void wpa_priv_cmd_set_key(struct wpa_priv_interface *iface,
390 void *buf, size_t len)
391 {
392 struct privsep_cmd_set_key *params;
393 int res;
394 struct wpa_driver_set_key_params p;
395
396 if (iface->drv_priv == NULL || iface->driver->set_key == NULL)
397 return;
398
399 if (len != sizeof(*params)) {
400 wpa_printf(MSG_DEBUG, "Invalid set_key request");
401 return;
402 }
403
404 params = buf;
405
406 os_memset(&p, 0, sizeof(p));
407 p.ifname = iface->ifname;
408 p.alg = params->alg;
409 p.addr = params->addr;
410 p.key_idx = params->key_idx;
411 p.set_tx = params->set_tx;
412 p.seq = params->seq_len ? params->seq : NULL;
413 p.seq_len = params->seq_len;
414 p.key = params->key_len ? params->key : NULL;
415 p.key_len = params->key_len;
416 p.key_flag = params->key_flag;
417
418 res = iface->driver->set_key(iface->drv_priv, &p);
419 wpa_printf(MSG_DEBUG, "drv->set_key: res=%d", res);
420 }
421
422
wpa_priv_cmd_get_capa(struct wpa_priv_interface * iface,struct sockaddr_un * from,socklen_t fromlen)423 static void wpa_priv_cmd_get_capa(struct wpa_priv_interface *iface,
424 struct sockaddr_un *from, socklen_t fromlen)
425 {
426 struct wpa_driver_capa capa;
427
428 if (iface->drv_priv == NULL)
429 goto fail;
430
431 if (iface->driver->get_capa == NULL ||
432 iface->driver->get_capa(iface->drv_priv, &capa) < 0)
433 goto fail;
434
435 /* For now, no support for passing extended_capa pointers */
436 capa.extended_capa = NULL;
437 capa.extended_capa_mask = NULL;
438 capa.extended_capa_len = 0;
439 sendto(iface->fd, &capa, sizeof(capa), 0, (struct sockaddr *) from,
440 fromlen);
441 return;
442
443 fail:
444 sendto(iface->fd, "", 0, 0, (struct sockaddr *) from, fromlen);
445 }
446
447
wpa_priv_l2_rx(void * ctx,const u8 * src_addr,const u8 * buf,size_t len)448 static void wpa_priv_l2_rx(void *ctx, const u8 *src_addr, const u8 *buf,
449 size_t len)
450 {
451 struct wpa_priv_l2 *l2_ctx = ctx;
452 struct wpa_priv_interface *iface = l2_ctx->parent;
453 struct msghdr msg;
454 struct iovec io[2];
455
456 io[0].iov_base = (u8 *) src_addr;
457 io[0].iov_len = ETH_ALEN;
458 io[1].iov_base = (u8 *) buf;
459 io[1].iov_len = len;
460
461 os_memset(&msg, 0, sizeof(msg));
462 msg.msg_iov = io;
463 msg.msg_iovlen = 2;
464 msg.msg_name = &iface->l2_addr[l2_ctx->idx];
465 msg.msg_namelen = iface->l2_addr_len[l2_ctx->idx];
466
467 if (sendmsg(iface->fd, &msg, 0) < 0) {
468 wpa_printf(MSG_ERROR, "sendmsg(l2 rx): %s", strerror(errno));
469 }
470 }
471
472
wpa_priv_allowed_l2_proto(u16 proto)473 static int wpa_priv_allowed_l2_proto(u16 proto)
474 {
475 return proto == ETH_P_EAPOL || proto == ETH_P_RSN_PREAUTH ||
476 proto == ETH_P_80211_ENCAP;
477 }
478
479
wpa_priv_cmd_l2_register(struct wpa_priv_interface * iface,struct sockaddr_un * from,socklen_t fromlen,void * buf,size_t len)480 static void wpa_priv_cmd_l2_register(struct wpa_priv_interface *iface,
481 struct sockaddr_un *from,
482 socklen_t fromlen,
483 void *buf, size_t len)
484 {
485 int *reg_cmd = buf;
486 u8 own_addr[ETH_ALEN];
487 int res;
488 u16 proto;
489 int idx;
490
491 if (len != 2 * sizeof(int)) {
492 wpa_printf(MSG_DEBUG, "Invalid l2_register length %lu",
493 (unsigned long) len);
494 return;
495 }
496
497 proto = reg_cmd[0];
498 if (!wpa_priv_allowed_l2_proto(proto)) {
499 wpa_printf(MSG_DEBUG, "Refused l2_packet connection for "
500 "ethertype 0x%x", proto);
501 return;
502 }
503
504 for (idx = 0; idx < WPA_PRIV_MAX_L2; idx++) {
505 if (!iface->l2[idx])
506 break;
507 }
508 if (idx == WPA_PRIV_MAX_L2) {
509 wpa_printf(MSG_DEBUG, "No free l2_packet connection found");
510 return;
511 }
512
513 os_memcpy(&iface->l2_addr[idx], from, fromlen);
514 iface->l2_addr_len[idx] = fromlen;
515
516 iface->l2_ctx[idx].idx = idx;
517 iface->l2_ctx[idx].parent = iface;
518 iface->l2[idx] = l2_packet_init(iface->ifname, NULL, proto,
519 wpa_priv_l2_rx, &iface->l2_ctx[idx],
520 reg_cmd[1]);
521 if (!iface->l2[idx]) {
522 wpa_printf(MSG_DEBUG, "Failed to initialize l2_packet "
523 "instance for protocol %d", proto);
524 return;
525 }
526
527 if (l2_packet_get_own_addr(iface->l2[idx], own_addr) < 0) {
528 wpa_printf(MSG_DEBUG, "Failed to get own address from "
529 "l2_packet");
530 l2_packet_deinit(iface->l2[idx]);
531 iface->l2[idx] = NULL;
532 return;
533 }
534
535 res = sendto(iface->fd, own_addr, ETH_ALEN, 0,
536 (struct sockaddr *) from, fromlen);
537 wpa_printf(MSG_DEBUG, "L2 registration[idx=%d]: res=%d", idx, res);
538 }
539
540
wpa_priv_cmd_l2_unregister(struct wpa_priv_interface * iface,struct sockaddr_un * from,socklen_t fromlen)541 static void wpa_priv_cmd_l2_unregister(struct wpa_priv_interface *iface,
542 struct sockaddr_un *from,
543 socklen_t fromlen)
544 {
545 int idx;
546
547 for (idx = 0; idx < WPA_PRIV_MAX_L2; idx++) {
548 if (iface->l2_addr_len[idx] == fromlen &&
549 os_memcmp(&iface->l2_addr[idx], from, fromlen) == 0)
550 break;
551 }
552 if (idx == WPA_PRIV_MAX_L2) {
553 wpa_printf(MSG_DEBUG,
554 "No registered l2_packet socket found for unregister request");
555 return;
556 }
557
558 if (iface->l2[idx]) {
559 l2_packet_deinit(iface->l2[idx]);
560 iface->l2[idx] = NULL;
561 }
562 }
563
564
wpa_priv_cmd_l2_notify_auth_start(struct wpa_priv_interface * iface,struct sockaddr_un * from)565 static void wpa_priv_cmd_l2_notify_auth_start(struct wpa_priv_interface *iface,
566 struct sockaddr_un *from)
567 {
568 int idx;
569
570 for (idx = 0; idx < WPA_PRIV_MAX_L2; idx++) {
571 if (iface->l2[idx])
572 l2_packet_notify_auth_start(iface->l2[idx]);
573 }
574 }
575
576
wpa_priv_cmd_l2_send(struct wpa_priv_interface * iface,struct sockaddr_un * from,socklen_t fromlen,void * buf,size_t len)577 static void wpa_priv_cmd_l2_send(struct wpa_priv_interface *iface,
578 struct sockaddr_un *from, socklen_t fromlen,
579 void *buf, size_t len)
580 {
581 u8 *dst_addr;
582 u16 proto;
583 int res;
584 int idx;
585
586 for (idx = 0; idx < WPA_PRIV_MAX_L2; idx++) {
587 if (iface->l2_addr_len[idx] == fromlen &&
588 os_memcmp(&iface->l2_addr[idx], from, fromlen) == 0)
589 break;
590 }
591 if (idx == WPA_PRIV_MAX_L2) {
592 wpa_printf(MSG_DEBUG,
593 "No registered l2_packet socket found for send request");
594 return;
595 }
596
597 if (iface->l2[idx] == NULL)
598 return;
599
600 if (len < ETH_ALEN + 2) {
601 wpa_printf(MSG_DEBUG, "Too short L2 send packet (len=%lu)",
602 (unsigned long) len);
603 return;
604 }
605
606 dst_addr = buf;
607 os_memcpy(&proto, (char *) buf + ETH_ALEN, 2);
608
609 if (!wpa_priv_allowed_l2_proto(proto)) {
610 wpa_printf(MSG_DEBUG, "Refused l2_packet send for ethertype "
611 "0x%x", proto);
612 return;
613 }
614
615 res = l2_packet_send(iface->l2[idx], dst_addr, proto,
616 (unsigned char *) buf + ETH_ALEN + 2,
617 len - ETH_ALEN - 2);
618 wpa_printf(MSG_DEBUG, "L2 send[idx=%d]: res=%d", idx, res);
619 }
620
621
wpa_priv_cmd_set_country(struct wpa_priv_interface * iface,char * buf)622 static void wpa_priv_cmd_set_country(struct wpa_priv_interface *iface,
623 char *buf)
624 {
625 if (iface->drv_priv == NULL || iface->driver->set_country == NULL ||
626 *buf == '\0')
627 return;
628
629 iface->driver->set_country(iface->drv_priv, buf);
630 }
631
632
wpa_priv_receive(int sock,void * eloop_ctx,void * sock_ctx)633 static void wpa_priv_receive(int sock, void *eloop_ctx, void *sock_ctx)
634 {
635 struct wpa_priv_interface *iface = eloop_ctx;
636 char buf[2000], *pos;
637 void *cmd_buf;
638 size_t cmd_len;
639 int res, cmd;
640 struct sockaddr_un from;
641 socklen_t fromlen = sizeof(from);
642
643 res = recvfrom(sock, buf, sizeof(buf), 0, (struct sockaddr *) &from,
644 &fromlen);
645 if (res < 0) {
646 wpa_printf(MSG_ERROR, "recvfrom: %s", strerror(errno));
647 return;
648 }
649
650 if (res < (int) sizeof(int)) {
651 wpa_printf(MSG_DEBUG, "Too short command (len=%d)", res);
652 return;
653 }
654
655 os_memcpy(&cmd, buf, sizeof(int));
656 wpa_printf(MSG_DEBUG, "Command %d for interface %s",
657 cmd, iface->ifname);
658 cmd_buf = &buf[sizeof(int)];
659 cmd_len = res - sizeof(int);
660
661 switch (cmd) {
662 case PRIVSEP_CMD_REGISTER:
663 wpa_priv_cmd_register(iface, &from, fromlen);
664 break;
665 case PRIVSEP_CMD_UNREGISTER:
666 wpa_priv_cmd_unregister(iface, &from);
667 break;
668 case PRIVSEP_CMD_SCAN:
669 wpa_priv_cmd_scan(iface, cmd_buf, cmd_len);
670 break;
671 case PRIVSEP_CMD_GET_SCAN_RESULTS:
672 wpa_priv_cmd_get_scan_results(iface, &from, fromlen);
673 break;
674 case PRIVSEP_CMD_ASSOCIATE:
675 wpa_priv_cmd_associate(iface, cmd_buf, cmd_len);
676 break;
677 case PRIVSEP_CMD_GET_BSSID:
678 wpa_priv_cmd_get_bssid(iface, &from, fromlen);
679 break;
680 case PRIVSEP_CMD_GET_SSID:
681 wpa_priv_cmd_get_ssid(iface, &from, fromlen);
682 break;
683 case PRIVSEP_CMD_SET_KEY:
684 wpa_priv_cmd_set_key(iface, cmd_buf, cmd_len);
685 break;
686 case PRIVSEP_CMD_GET_CAPA:
687 wpa_priv_cmd_get_capa(iface, &from, fromlen);
688 break;
689 case PRIVSEP_CMD_L2_REGISTER:
690 wpa_priv_cmd_l2_register(iface, &from, fromlen,
691 cmd_buf, cmd_len);
692 break;
693 case PRIVSEP_CMD_L2_UNREGISTER:
694 wpa_priv_cmd_l2_unregister(iface, &from, fromlen);
695 break;
696 case PRIVSEP_CMD_L2_NOTIFY_AUTH_START:
697 wpa_priv_cmd_l2_notify_auth_start(iface, &from);
698 break;
699 case PRIVSEP_CMD_L2_SEND:
700 wpa_priv_cmd_l2_send(iface, &from, fromlen, cmd_buf, cmd_len);
701 break;
702 case PRIVSEP_CMD_SET_COUNTRY:
703 pos = cmd_buf;
704 if (pos + cmd_len >= buf + sizeof(buf))
705 break;
706 pos[cmd_len] = '\0';
707 wpa_priv_cmd_set_country(iface, pos);
708 break;
709 case PRIVSEP_CMD_AUTHENTICATE:
710 wpa_priv_cmd_authenticate(iface, cmd_buf, cmd_len);
711 break;
712 }
713 }
714
715
wpa_priv_interface_deinit(struct wpa_priv_interface * iface)716 static void wpa_priv_interface_deinit(struct wpa_priv_interface *iface)
717 {
718 int i;
719
720 if (iface->drv_priv) {
721 if (iface->driver->deinit)
722 iface->driver->deinit(iface->drv_priv);
723 if (iface->drv_global_priv)
724 iface->driver->global_deinit(iface->drv_global_priv);
725 }
726
727 if (iface->fd >= 0) {
728 eloop_unregister_read_sock(iface->fd);
729 close(iface->fd);
730 unlink(iface->sock_name);
731 }
732
733 for (i = 0; i < WPA_PRIV_MAX_L2; i++) {
734 if (iface->l2[i])
735 l2_packet_deinit(iface->l2[i]);
736 }
737
738 os_free(iface->ifname);
739 os_free(iface->driver_name);
740 os_free(iface->sock_name);
741 os_free(iface);
742 }
743
744
745 static struct wpa_priv_interface *
wpa_priv_interface_init(void * ctx,const char * dir,const char * params)746 wpa_priv_interface_init(void *ctx, const char *dir, const char *params)
747 {
748 struct wpa_priv_interface *iface;
749 char *pos;
750 size_t len;
751 struct sockaddr_un addr;
752 int i;
753
754 pos = os_strchr(params, ':');
755 if (pos == NULL)
756 return NULL;
757
758 iface = os_zalloc(sizeof(*iface));
759 if (iface == NULL)
760 return NULL;
761 iface->fd = -1;
762 iface->ctx = ctx;
763
764 len = pos - params;
765 iface->driver_name = dup_binstr(params, len);
766 if (iface->driver_name == NULL) {
767 wpa_priv_interface_deinit(iface);
768 return NULL;
769 }
770
771 for (i = 0; wpa_drivers[i]; i++) {
772 if (os_strcmp(iface->driver_name,
773 wpa_drivers[i]->name) == 0) {
774 iface->driver = wpa_drivers[i];
775 break;
776 }
777 }
778 if (iface->driver == NULL) {
779 wpa_printf(MSG_ERROR, "Unsupported driver '%s'",
780 iface->driver_name);
781 wpa_priv_interface_deinit(iface);
782 return NULL;
783 }
784
785 pos++;
786 iface->ifname = os_strdup(pos);
787 if (iface->ifname == NULL) {
788 wpa_priv_interface_deinit(iface);
789 return NULL;
790 }
791
792 len = os_strlen(dir) + 1 + os_strlen(iface->ifname);
793 iface->sock_name = os_malloc(len + 1);
794 if (iface->sock_name == NULL) {
795 wpa_priv_interface_deinit(iface);
796 return NULL;
797 }
798
799 os_snprintf(iface->sock_name, len + 1, "%s/%s", dir, iface->ifname);
800 if (os_strlen(iface->sock_name) >= sizeof(addr.sun_path)) {
801 wpa_priv_interface_deinit(iface);
802 return NULL;
803 }
804
805 iface->fd = socket(PF_UNIX, SOCK_DGRAM, 0);
806 if (iface->fd < 0) {
807 wpa_printf(MSG_ERROR, "socket(PF_UNIX): %s", strerror(errno));
808 wpa_priv_interface_deinit(iface);
809 return NULL;
810 }
811
812 os_memset(&addr, 0, sizeof(addr));
813 addr.sun_family = AF_UNIX;
814 os_strlcpy(addr.sun_path, iface->sock_name, sizeof(addr.sun_path));
815
816 if (bind(iface->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
817 wpa_printf(MSG_DEBUG, "bind(PF_UNIX) failed: %s",
818 strerror(errno));
819 if (connect(iface->fd, (struct sockaddr *) &addr,
820 sizeof(addr)) < 0) {
821 wpa_printf(MSG_DEBUG, "Socket exists, but does not "
822 "allow connections - assuming it was "
823 "leftover from forced program termination");
824 if (unlink(iface->sock_name) < 0) {
825 wpa_printf(MSG_ERROR,
826 "Could not unlink existing ctrl_iface socket '%s': %s",
827 iface->sock_name, strerror(errno));
828 goto fail;
829 }
830 if (bind(iface->fd, (struct sockaddr *) &addr,
831 sizeof(addr)) < 0) {
832 wpa_printf(MSG_ERROR,
833 "wpa-priv-iface-init: bind(PF_UNIX): %s",
834 strerror(errno));
835 goto fail;
836 }
837 wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
838 "socket '%s'", iface->sock_name);
839 } else {
840 wpa_printf(MSG_INFO, "Socket exists and seems to be "
841 "in use - cannot override it");
842 wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
843 "not used anymore", iface->sock_name);
844 goto fail;
845 }
846 }
847
848 if (chmod(iface->sock_name, S_IRWXU | S_IRWXG | S_IRWXO) < 0) {
849 wpa_printf(MSG_ERROR, "chmod: %s", strerror(errno));
850 goto fail;
851 }
852
853 eloop_register_read_sock(iface->fd, wpa_priv_receive, iface, NULL);
854
855 return iface;
856
857 fail:
858 wpa_priv_interface_deinit(iface);
859 return NULL;
860 }
861
862
wpa_priv_send_event(struct wpa_priv_interface * iface,int event,const void * data,size_t data_len)863 static int wpa_priv_send_event(struct wpa_priv_interface *iface, int event,
864 const void *data, size_t data_len)
865 {
866 struct msghdr msg;
867 struct iovec io[2];
868
869 io[0].iov_base = &event;
870 io[0].iov_len = sizeof(event);
871 io[1].iov_base = (u8 *) data;
872 io[1].iov_len = data_len;
873
874 os_memset(&msg, 0, sizeof(msg));
875 msg.msg_iov = io;
876 msg.msg_iovlen = data ? 2 : 1;
877 msg.msg_name = &iface->drv_addr;
878 msg.msg_namelen = iface->drv_addr_len;
879
880 if (sendmsg(iface->fd, &msg, 0) < 0) {
881 wpa_printf(MSG_ERROR, "sendmsg(wpas_socket): %s",
882 strerror(errno));
883 return -1;
884 }
885
886 return 0;
887 }
888
889
wpa_priv_send_auth(struct wpa_priv_interface * iface,union wpa_event_data * data)890 static void wpa_priv_send_auth(struct wpa_priv_interface *iface,
891 union wpa_event_data *data)
892 {
893 size_t buflen = sizeof(struct privsep_event_auth) + data->auth.ies_len;
894 struct privsep_event_auth *auth;
895 u8 *buf, *pos;
896
897 buf = os_zalloc(buflen);
898 if (buf == NULL)
899 return;
900
901 auth = (struct privsep_event_auth *) buf;
902 pos = (u8 *) (auth + 1);
903
904 os_memcpy(auth->peer, data->auth.peer, ETH_ALEN);
905 os_memcpy(auth->bssid, data->auth.bssid, ETH_ALEN);
906 auth->auth_type = data->auth.auth_type;
907 auth->auth_transaction = data->auth.auth_transaction;
908 auth->status_code = data->auth.status_code;
909 if (data->auth.ies) {
910 os_memcpy(pos, data->auth.ies, data->auth.ies_len);
911 auth->ies_len = data->auth.ies_len;
912 }
913
914 wpa_priv_send_event(iface, PRIVSEP_EVENT_AUTH, buf, buflen);
915
916 os_free(buf);
917 }
918
919
wpa_priv_send_assoc(struct wpa_priv_interface * iface,int event,union wpa_event_data * data)920 static void wpa_priv_send_assoc(struct wpa_priv_interface *iface, int event,
921 union wpa_event_data *data)
922 {
923 size_t buflen = 3 * sizeof(int);
924 u8 *buf, *pos;
925 int len;
926
927 if (data) {
928 buflen += data->assoc_info.req_ies_len +
929 data->assoc_info.resp_ies_len +
930 data->assoc_info.beacon_ies_len;
931 }
932
933 buf = os_malloc(buflen);
934 if (buf == NULL)
935 return;
936
937 pos = buf;
938
939 if (data && data->assoc_info.req_ies) {
940 len = data->assoc_info.req_ies_len;
941 os_memcpy(pos, &len, sizeof(int));
942 pos += sizeof(int);
943 os_memcpy(pos, data->assoc_info.req_ies, len);
944 pos += len;
945 } else {
946 len = 0;
947 os_memcpy(pos, &len, sizeof(int));
948 pos += sizeof(int);
949 }
950
951 if (data && data->assoc_info.resp_ies) {
952 len = data->assoc_info.resp_ies_len;
953 os_memcpy(pos, &len, sizeof(int));
954 pos += sizeof(int);
955 os_memcpy(pos, data->assoc_info.resp_ies, len);
956 pos += len;
957 } else {
958 len = 0;
959 os_memcpy(pos, &len, sizeof(int));
960 pos += sizeof(int);
961 }
962
963 if (data && data->assoc_info.beacon_ies) {
964 len = data->assoc_info.beacon_ies_len;
965 os_memcpy(pos, &len, sizeof(int));
966 pos += sizeof(int);
967 os_memcpy(pos, data->assoc_info.beacon_ies, len);
968 pos += len;
969 } else {
970 len = 0;
971 os_memcpy(pos, &len, sizeof(int));
972 pos += sizeof(int);
973 }
974
975 wpa_priv_send_event(iface, event, buf, buflen);
976
977 os_free(buf);
978 }
979
980
wpa_priv_send_interface_status(struct wpa_priv_interface * iface,union wpa_event_data * data)981 static void wpa_priv_send_interface_status(struct wpa_priv_interface *iface,
982 union wpa_event_data *data)
983 {
984 int ievent;
985 size_t len, maxlen;
986 u8 *buf;
987 char *ifname;
988
989 if (data == NULL)
990 return;
991
992 ievent = data->interface_status.ievent;
993 maxlen = sizeof(data->interface_status.ifname);
994 ifname = data->interface_status.ifname;
995 for (len = 0; len < maxlen && ifname[len]; len++)
996 ;
997
998 buf = os_malloc(sizeof(int) + len);
999 if (buf == NULL)
1000 return;
1001
1002 os_memcpy(buf, &ievent, sizeof(int));
1003 os_memcpy(buf + sizeof(int), ifname, len);
1004
1005 wpa_priv_send_event(iface, PRIVSEP_EVENT_INTERFACE_STATUS,
1006 buf, sizeof(int) + len);
1007
1008 os_free(buf);
1009
1010 }
1011
1012
wpa_priv_send_ft_response(struct wpa_priv_interface * iface,union wpa_event_data * data)1013 static void wpa_priv_send_ft_response(struct wpa_priv_interface *iface,
1014 union wpa_event_data *data)
1015 {
1016 size_t len;
1017 u8 *buf, *pos;
1018
1019 if (data == NULL || data->ft_ies.ies == NULL)
1020 return;
1021
1022 len = sizeof(int) + ETH_ALEN + data->ft_ies.ies_len;
1023 buf = os_malloc(len);
1024 if (buf == NULL)
1025 return;
1026
1027 pos = buf;
1028 os_memcpy(pos, &data->ft_ies.ft_action, sizeof(int));
1029 pos += sizeof(int);
1030 os_memcpy(pos, data->ft_ies.target_ap, ETH_ALEN);
1031 pos += ETH_ALEN;
1032 os_memcpy(pos, data->ft_ies.ies, data->ft_ies.ies_len);
1033
1034 wpa_priv_send_event(iface, PRIVSEP_EVENT_FT_RESPONSE, buf, len);
1035
1036 os_free(buf);
1037
1038 }
1039
1040
wpa_supplicant_event(void * ctx,enum wpa_event_type event,union wpa_event_data * data)1041 void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
1042 union wpa_event_data *data)
1043 {
1044 struct wpa_priv_interface *iface = ctx;
1045
1046 wpa_printf(MSG_DEBUG, "%s - event=%d", __func__, event);
1047
1048 if (!iface->wpas_registered) {
1049 wpa_printf(MSG_DEBUG, "Driver event received, but "
1050 "wpa_supplicant not registered");
1051 return;
1052 }
1053
1054 switch (event) {
1055 case EVENT_ASSOC:
1056 wpa_priv_send_assoc(iface, PRIVSEP_EVENT_ASSOC, data);
1057 break;
1058 case EVENT_DISASSOC:
1059 wpa_priv_send_event(iface, PRIVSEP_EVENT_DISASSOC, NULL, 0);
1060 break;
1061 case EVENT_ASSOCINFO:
1062 if (data == NULL)
1063 return;
1064 wpa_priv_send_assoc(iface, PRIVSEP_EVENT_ASSOCINFO, data);
1065 break;
1066 case EVENT_MICHAEL_MIC_FAILURE:
1067 if (data == NULL)
1068 return;
1069 wpa_priv_send_event(iface, PRIVSEP_EVENT_MICHAEL_MIC_FAILURE,
1070 &data->michael_mic_failure.unicast,
1071 sizeof(int));
1072 break;
1073 case EVENT_SCAN_STARTED:
1074 wpa_priv_send_event(iface, PRIVSEP_EVENT_SCAN_STARTED, NULL,
1075 0);
1076 break;
1077 case EVENT_SCAN_RESULTS:
1078 wpa_priv_send_event(iface, PRIVSEP_EVENT_SCAN_RESULTS, NULL,
1079 0);
1080 break;
1081 case EVENT_INTERFACE_STATUS:
1082 wpa_priv_send_interface_status(iface, data);
1083 break;
1084 case EVENT_PMKID_CANDIDATE:
1085 if (data == NULL)
1086 return;
1087 wpa_priv_send_event(iface, PRIVSEP_EVENT_PMKID_CANDIDATE,
1088 &data->pmkid_candidate,
1089 sizeof(struct pmkid_candidate));
1090 break;
1091 case EVENT_FT_RESPONSE:
1092 wpa_priv_send_ft_response(iface, data);
1093 break;
1094 case EVENT_AUTH:
1095 wpa_priv_send_auth(iface, data);
1096 break;
1097 default:
1098 wpa_printf(MSG_DEBUG, "Unsupported driver event %d (%s) - TODO",
1099 event, event_to_string(event));
1100 break;
1101 }
1102 }
1103
1104
wpa_supplicant_event_global(void * ctx,enum wpa_event_type event,union wpa_event_data * data)1105 void wpa_supplicant_event_global(void *ctx, enum wpa_event_type event,
1106 union wpa_event_data *data)
1107 {
1108 struct wpa_priv_global *global = ctx;
1109 struct wpa_priv_interface *iface;
1110
1111 if (event != EVENT_INTERFACE_STATUS)
1112 return;
1113
1114 for (iface = global->interfaces; iface; iface = iface->next) {
1115 if (os_strcmp(iface->ifname, data->interface_status.ifname) ==
1116 0)
1117 break;
1118 }
1119 if (iface && iface->driver->get_ifindex) {
1120 unsigned int ifindex;
1121
1122 ifindex = iface->driver->get_ifindex(iface->drv_priv);
1123 if (ifindex != data->interface_status.ifindex) {
1124 wpa_printf(MSG_DEBUG,
1125 "%s: interface status ifindex %d mismatch (%d)",
1126 iface->ifname, ifindex,
1127 data->interface_status.ifindex);
1128 return;
1129 }
1130 }
1131 if (iface)
1132 wpa_supplicant_event(iface, event, data);
1133 }
1134
1135
wpa_supplicant_rx_eapol(void * ctx,const u8 * src_addr,const u8 * buf,size_t len)1136 void wpa_supplicant_rx_eapol(void *ctx, const u8 *src_addr,
1137 const u8 *buf, size_t len)
1138 {
1139 struct wpa_priv_interface *iface = ctx;
1140 struct msghdr msg;
1141 struct iovec io[3];
1142 int event = PRIVSEP_EVENT_RX_EAPOL;
1143
1144 wpa_printf(MSG_DEBUG, "RX EAPOL from driver");
1145 io[0].iov_base = &event;
1146 io[0].iov_len = sizeof(event);
1147 io[1].iov_base = (u8 *) src_addr;
1148 io[1].iov_len = ETH_ALEN;
1149 io[2].iov_base = (u8 *) buf;
1150 io[2].iov_len = len;
1151
1152 os_memset(&msg, 0, sizeof(msg));
1153 msg.msg_iov = io;
1154 msg.msg_iovlen = 3;
1155 msg.msg_name = &iface->drv_addr;
1156 msg.msg_namelen = iface->drv_addr_len;
1157
1158 if (sendmsg(iface->fd, &msg, 0) < 0)
1159 wpa_printf(MSG_ERROR, "sendmsg(wpas_socket): %s",
1160 strerror(errno));
1161 }
1162
1163
wpa_priv_terminate(int sig,void * signal_ctx)1164 static void wpa_priv_terminate(int sig, void *signal_ctx)
1165 {
1166 wpa_printf(MSG_DEBUG, "wpa_priv termination requested");
1167 eloop_terminate();
1168 }
1169
1170
wpa_priv_fd_workaround(void)1171 static void wpa_priv_fd_workaround(void)
1172 {
1173 #ifdef __linux__
1174 int s, i;
1175 /* When started from pcmcia-cs scripts, wpa_supplicant might start with
1176 * fd 0, 1, and 2 closed. This will cause some issues because many
1177 * places in wpa_supplicant are still printing out to stdout. As a
1178 * workaround, make sure that fd's 0, 1, and 2 are not used for other
1179 * sockets. */
1180 for (i = 0; i < 3; i++) {
1181 s = open("/dev/null", O_RDWR);
1182 if (s > 2) {
1183 close(s);
1184 break;
1185 }
1186 }
1187 #endif /* __linux__ */
1188 }
1189
1190
usage(void)1191 static void usage(void)
1192 {
1193 printf("wpa_priv v%s\n"
1194 "Copyright (c) 2007-2017, Jouni Malinen <j@w1.fi> and "
1195 "contributors\n"
1196 "\n"
1197 "usage:\n"
1198 " wpa_priv [-Bdd] [-c<ctrl dir>] [-P<pid file>] "
1199 "<driver:ifname> \\\n"
1200 " [driver:ifname ...]\n",
1201 VERSION_STR);
1202 }
1203
1204
main(int argc,char * argv[])1205 int main(int argc, char *argv[])
1206 {
1207 int c, i;
1208 int ret = -1;
1209 char *pid_file = NULL;
1210 int daemonize = 0;
1211 char *ctrl_dir = "/var/run/wpa_priv";
1212 struct wpa_priv_global global;
1213 struct wpa_priv_interface *iface;
1214
1215 if (os_program_init())
1216 return -1;
1217
1218 wpa_priv_fd_workaround();
1219
1220 os_memset(&global, 0, sizeof(global));
1221 global.interfaces = NULL;
1222
1223 for (;;) {
1224 c = getopt(argc, argv, "Bc:dP:");
1225 if (c < 0)
1226 break;
1227 switch (c) {
1228 case 'B':
1229 daemonize++;
1230 break;
1231 case 'c':
1232 ctrl_dir = optarg;
1233 break;
1234 case 'd':
1235 wpa_debug_level--;
1236 break;
1237 case 'P':
1238 pid_file = os_rel2abs_path(optarg);
1239 break;
1240 default:
1241 usage();
1242 goto out2;
1243 }
1244 }
1245
1246 if (optind >= argc) {
1247 usage();
1248 goto out2;
1249 }
1250
1251 wpa_printf(MSG_DEBUG, "wpa_priv control directory: '%s'", ctrl_dir);
1252
1253 if (eloop_init()) {
1254 wpa_printf(MSG_ERROR, "Failed to initialize event loop");
1255 goto out2;
1256 }
1257
1258 for (i = optind; i < argc; i++) {
1259 wpa_printf(MSG_DEBUG, "Adding driver:interface %s", argv[i]);
1260 iface = wpa_priv_interface_init(&global, ctrl_dir, argv[i]);
1261 if (iface == NULL)
1262 goto out;
1263 iface->next = global.interfaces;
1264 global.interfaces = iface;
1265 }
1266
1267 if (daemonize && os_daemonize(pid_file) && eloop_sock_requeue())
1268 goto out;
1269
1270 eloop_register_signal_terminate(wpa_priv_terminate, NULL);
1271 eloop_run();
1272
1273 ret = 0;
1274
1275 out:
1276 iface = global.interfaces;
1277 while (iface) {
1278 struct wpa_priv_interface *prev = iface;
1279 iface = iface->next;
1280 wpa_priv_interface_deinit(prev);
1281 }
1282
1283 eloop_destroy();
1284
1285 out2:
1286 if (daemonize)
1287 os_daemonize_terminate(pid_file);
1288 os_free(pid_file);
1289 os_program_deinit();
1290
1291 return ret;
1292 }
1293
