1 /*
2 * DPP functionality shared between hostapd and wpa_supplicant
3 * Copyright (c) 2017, Qualcomm Atheros, Inc.
4 * Copyright (c) 2018-2020, The Linux Foundation
5 * Copyright (c) 2021-2022, Qualcomm Innovation Center, Inc.
6 *
7 * This software may be distributed under the terms of the BSD license.
8 * See README for more details.
9 */
10
11 #include "utils/includes.h"
12
13 #include "utils/common.h"
14 #include "utils/base64.h"
15 #include "utils/json.h"
16 #include "common/ieee802_11_common.h"
17 #include "common/wpa_ctrl.h"
18 #include "common/gas.h"
19 #include "eap_common/eap_defs.h"
20 #include "crypto/crypto.h"
21 #include "crypto/random.h"
22 #include "crypto/aes.h"
23 #include "crypto/aes_siv.h"
24 #include "drivers/driver.h"
25 #include "dpp.h"
26 #include "dpp_i.h"
27
28
29 #ifdef CONFIG_TESTING_OPTIONS
30 #ifdef CONFIG_DPP3
31 int dpp_version_override = 3;
32 #elif defined(CONFIG_DPP2)
33 int dpp_version_override = 2;
34 #else
35 int dpp_version_override = 1;
36 #endif
37 enum dpp_test_behavior dpp_test = DPP_TEST_DISABLED;
38 #endif /* CONFIG_TESTING_OPTIONS */
39
40
dpp_auth_fail(struct dpp_authentication * auth,const char * txt)41 void dpp_auth_fail(struct dpp_authentication *auth, const char *txt)
42 {
43 wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_FAIL "%s", txt);
44 }
45
46
dpp_alloc_msg(enum dpp_public_action_frame_type type,size_t len)47 struct wpabuf * dpp_alloc_msg(enum dpp_public_action_frame_type type,
48 size_t len)
49 {
50 struct wpabuf *msg;
51
52 msg = wpabuf_alloc(8 + len);
53 if (!msg)
54 return NULL;
55 wpabuf_put_u8(msg, WLAN_ACTION_PUBLIC);
56 wpabuf_put_u8(msg, WLAN_PA_VENDOR_SPECIFIC);
57 wpabuf_put_be24(msg, OUI_WFA);
58 wpabuf_put_u8(msg, DPP_OUI_TYPE);
59 wpabuf_put_u8(msg, 1); /* Crypto Suite */
60 wpabuf_put_u8(msg, type);
61 return msg;
62 }
63
64
dpp_get_attr(const u8 * buf,size_t len,u16 req_id,u16 * ret_len)65 const u8 * dpp_get_attr(const u8 *buf, size_t len, u16 req_id, u16 *ret_len)
66 {
67 u16 id, alen;
68 const u8 *pos = buf, *end = buf + len;
69
70 while (end - pos >= 4) {
71 id = WPA_GET_LE16(pos);
72 pos += 2;
73 alen = WPA_GET_LE16(pos);
74 pos += 2;
75 if (alen > end - pos)
76 return NULL;
77 if (id == req_id) {
78 *ret_len = alen;
79 return pos;
80 }
81 pos += alen;
82 }
83
84 return NULL;
85 }
86
87
dpp_get_attr_next(const u8 * prev,const u8 * buf,size_t len,u16 req_id,u16 * ret_len)88 static const u8 * dpp_get_attr_next(const u8 *prev, const u8 *buf, size_t len,
89 u16 req_id, u16 *ret_len)
90 {
91 u16 id, alen;
92 const u8 *pos, *end = buf + len;
93
94 if (!prev)
95 pos = buf;
96 else
97 pos = prev + WPA_GET_LE16(prev - 2);
98 while (end - pos >= 4) {
99 id = WPA_GET_LE16(pos);
100 pos += 2;
101 alen = WPA_GET_LE16(pos);
102 pos += 2;
103 if (alen > end - pos)
104 return NULL;
105 if (id == req_id) {
106 *ret_len = alen;
107 return pos;
108 }
109 pos += alen;
110 }
111
112 return NULL;
113 }
114
115
dpp_check_attrs(const u8 * buf,size_t len)116 int dpp_check_attrs(const u8 *buf, size_t len)
117 {
118 const u8 *pos, *end;
119 int wrapped_data = 0;
120
121 pos = buf;
122 end = buf + len;
123 while (end - pos >= 4) {
124 u16 id, alen;
125
126 id = WPA_GET_LE16(pos);
127 pos += 2;
128 alen = WPA_GET_LE16(pos);
129 pos += 2;
130 wpa_printf(MSG_MSGDUMP, "DPP: Attribute ID %04x len %u",
131 id, alen);
132 if (alen > end - pos) {
133 wpa_printf(MSG_DEBUG,
134 "DPP: Truncated message - not enough room for the attribute - dropped");
135 return -1;
136 }
137 if (wrapped_data) {
138 wpa_printf(MSG_DEBUG,
139 "DPP: An unexpected attribute included after the Wrapped Data attribute");
140 return -1;
141 }
142 if (id == DPP_ATTR_WRAPPED_DATA)
143 wrapped_data = 1;
144 pos += alen;
145 }
146
147 if (end != pos) {
148 wpa_printf(MSG_DEBUG,
149 "DPP: Unexpected octets (%d) after the last attribute",
150 (int) (end - pos));
151 return -1;
152 }
153
154 return 0;
155 }
156
157
dpp_bootstrap_info_free(struct dpp_bootstrap_info * info)158 void dpp_bootstrap_info_free(struct dpp_bootstrap_info *info)
159 {
160 if (!info)
161 return;
162 os_free(info->uri);
163 os_free(info->info);
164 os_free(info->chan);
165 os_free(info->pk);
166 crypto_ec_key_deinit(info->pubkey);
167 str_clear_free(info->configurator_params);
168 os_free(info);
169 }
170
171
dpp_bootstrap_type_txt(enum dpp_bootstrap_type type)172 const char * dpp_bootstrap_type_txt(enum dpp_bootstrap_type type)
173 {
174 switch (type) {
175 case DPP_BOOTSTRAP_QR_CODE:
176 return "QRCODE";
177 case DPP_BOOTSTRAP_PKEX:
178 return "PKEX";
179 case DPP_BOOTSTRAP_NFC_URI:
180 return "NFC-URI";
181 }
182 return "??";
183 }
184
185
dpp_uri_valid_info(const char * info)186 static int dpp_uri_valid_info(const char *info)
187 {
188 while (*info) {
189 unsigned char val = *info++;
190
191 if (val < 0x20 || val > 0x7e || val == 0x3b)
192 return 0;
193 }
194
195 return 1;
196 }
197
198
dpp_clone_uri(struct dpp_bootstrap_info * bi,const char * uri)199 static int dpp_clone_uri(struct dpp_bootstrap_info *bi, const char *uri)
200 {
201 bi->uri = os_strdup(uri);
202 return bi->uri ? 0 : -1;
203 }
204
205
dpp_parse_uri_chan_list(struct dpp_bootstrap_info * bi,const char * chan_list)206 int dpp_parse_uri_chan_list(struct dpp_bootstrap_info *bi,
207 const char *chan_list)
208 {
209 const char *pos = chan_list, *pos2;
210 int opclass = -1, channel, freq;
211
212 while (pos && *pos && *pos != ';') {
213 pos2 = pos;
214 while (*pos2 >= '0' && *pos2 <= '9')
215 pos2++;
216 if (*pos2 == '/') {
217 opclass = atoi(pos);
218 pos = pos2 + 1;
219 }
220 if (opclass <= 0)
221 goto fail;
222 channel = atoi(pos);
223 if (channel <= 0)
224 goto fail;
225 while (*pos >= '0' && *pos <= '9')
226 pos++;
227 freq = ieee80211_chan_to_freq(NULL, opclass, channel);
228 wpa_printf(MSG_DEBUG,
229 "DPP: URI channel-list: opclass=%d channel=%d ==> freq=%d",
230 opclass, channel, freq);
231 bi->channels_listed = true;
232 if (freq < 0) {
233 wpa_printf(MSG_DEBUG,
234 "DPP: Ignore unknown URI channel-list channel (opclass=%d channel=%d)",
235 opclass, channel);
236 } else if (bi->num_freq == DPP_BOOTSTRAP_MAX_FREQ) {
237 wpa_printf(MSG_DEBUG,
238 "DPP: Too many channels in URI channel-list - ignore list");
239 bi->num_freq = 0;
240 break;
241 } else {
242 bi->freq[bi->num_freq++] = freq;
243 }
244
245 if (*pos == ';' || *pos == '\0')
246 break;
247 if (*pos != ',')
248 goto fail;
249 pos++;
250 }
251
252 return 0;
253 fail:
254 wpa_printf(MSG_DEBUG, "DPP: Invalid URI channel-list");
255 return -1;
256 }
257
258
dpp_parse_uri_mac(struct dpp_bootstrap_info * bi,const char * mac)259 int dpp_parse_uri_mac(struct dpp_bootstrap_info *bi, const char *mac)
260 {
261 if (!mac)
262 return 0;
263
264 if (hwaddr_aton2(mac, bi->mac_addr) < 0) {
265 wpa_printf(MSG_DEBUG, "DPP: Invalid URI mac");
266 return -1;
267 }
268
269 wpa_printf(MSG_DEBUG, "DPP: URI mac: " MACSTR, MAC2STR(bi->mac_addr));
270
271 return 0;
272 }
273
274
dpp_parse_uri_info(struct dpp_bootstrap_info * bi,const char * info)275 int dpp_parse_uri_info(struct dpp_bootstrap_info *bi, const char *info)
276 {
277 const char *end;
278
279 if (!info)
280 return 0;
281
282 end = os_strchr(info, ';');
283 if (!end)
284 end = info + os_strlen(info);
285 bi->info = os_malloc(end - info + 1);
286 if (!bi->info)
287 return -1;
288 os_memcpy(bi->info, info, end - info);
289 bi->info[end - info] = '\0';
290 wpa_printf(MSG_DEBUG, "DPP: URI(information): %s", bi->info);
291 if (!dpp_uri_valid_info(bi->info)) {
292 wpa_printf(MSG_DEBUG, "DPP: Invalid URI information payload");
293 return -1;
294 }
295
296 return 0;
297 }
298
299
dpp_parse_uri_version(struct dpp_bootstrap_info * bi,const char * version)300 int dpp_parse_uri_version(struct dpp_bootstrap_info *bi, const char *version)
301 {
302 #ifdef CONFIG_DPP2
303 if (!version || DPP_VERSION < 2)
304 return 0;
305
306 if (*version == '1')
307 bi->version = 1;
308 else if (*version == '2')
309 bi->version = 2;
310 else if (*version == '3')
311 bi->version = 3;
312 else
313 wpa_printf(MSG_DEBUG, "DPP: Unknown URI version");
314
315 wpa_printf(MSG_DEBUG, "DPP: URI version: %d", bi->version);
316 #endif /* CONFIG_DPP2 */
317
318 return 0;
319 }
320
321
dpp_parse_uri_pk(struct dpp_bootstrap_info * bi,const char * info)322 static int dpp_parse_uri_pk(struct dpp_bootstrap_info *bi, const char *info)
323 {
324 u8 *data;
325 size_t data_len;
326 int res;
327 const char *end;
328
329 end = os_strchr(info, ';');
330 if (!end)
331 return -1;
332
333 data = base64_decode(info, end - info, &data_len);
334 if (!data) {
335 wpa_printf(MSG_DEBUG,
336 "DPP: Invalid base64 encoding on URI public-key");
337 return -1;
338 }
339 wpa_hexdump(MSG_DEBUG, "DPP: Base64 decoded URI public-key",
340 data, data_len);
341
342 res = dpp_get_subject_public_key(bi, data, data_len);
343 os_free(data);
344 return res;
345 }
346
347
dpp_parse_uri(const char * uri)348 static struct dpp_bootstrap_info * dpp_parse_uri(const char *uri)
349 {
350 const char *pos = uri;
351 const char *end;
352 const char *chan_list = NULL, *mac = NULL, *info = NULL, *pk = NULL;
353 const char *version = NULL;
354 struct dpp_bootstrap_info *bi;
355
356 wpa_hexdump_ascii(MSG_DEBUG, "DPP: URI", uri, os_strlen(uri));
357
358 if (os_strncmp(pos, "DPP:", 4) != 0) {
359 wpa_printf(MSG_INFO, "DPP: Not a DPP URI");
360 return NULL;
361 }
362 pos += 4;
363
364 for (;;) {
365 end = os_strchr(pos, ';');
366 if (!end)
367 break;
368
369 if (end == pos) {
370 /* Handle terminating ";;" and ignore unexpected ";"
371 * for parsing robustness. */
372 pos++;
373 continue;
374 }
375
376 if (pos[0] == 'C' && pos[1] == ':' && !chan_list)
377 chan_list = pos + 2;
378 else if (pos[0] == 'M' && pos[1] == ':' && !mac)
379 mac = pos + 2;
380 else if (pos[0] == 'I' && pos[1] == ':' && !info)
381 info = pos + 2;
382 else if (pos[0] == 'K' && pos[1] == ':' && !pk)
383 pk = pos + 2;
384 else if (pos[0] == 'V' && pos[1] == ':' && !version)
385 version = pos + 2;
386 else
387 wpa_hexdump_ascii(MSG_DEBUG,
388 "DPP: Ignore unrecognized URI parameter",
389 pos, end - pos);
390 pos = end + 1;
391 }
392
393 if (!pk) {
394 wpa_printf(MSG_INFO, "DPP: URI missing public-key");
395 return NULL;
396 }
397
398 bi = os_zalloc(sizeof(*bi));
399 if (!bi)
400 return NULL;
401
402 if (dpp_clone_uri(bi, uri) < 0 ||
403 dpp_parse_uri_chan_list(bi, chan_list) < 0 ||
404 dpp_parse_uri_mac(bi, mac) < 0 ||
405 dpp_parse_uri_info(bi, info) < 0 ||
406 dpp_parse_uri_version(bi, version) < 0 ||
407 dpp_parse_uri_pk(bi, pk) < 0) {
408 dpp_bootstrap_info_free(bi);
409 bi = NULL;
410 }
411
412 return bi;
413 }
414
415
dpp_build_attr_status(struct wpabuf * msg,enum dpp_status_error status)416 void dpp_build_attr_status(struct wpabuf *msg, enum dpp_status_error status)
417 {
418 wpa_printf(MSG_DEBUG, "DPP: Status %d", status);
419 wpabuf_put_le16(msg, DPP_ATTR_STATUS);
420 wpabuf_put_le16(msg, 1);
421 wpabuf_put_u8(msg, status);
422 }
423
424
dpp_build_attr_r_bootstrap_key_hash(struct wpabuf * msg,const u8 * hash)425 void dpp_build_attr_r_bootstrap_key_hash(struct wpabuf *msg, const u8 *hash)
426 {
427 if (hash) {
428 wpa_printf(MSG_DEBUG, "DPP: R-Bootstrap Key Hash");
429 wpabuf_put_le16(msg, DPP_ATTR_R_BOOTSTRAP_KEY_HASH);
430 wpabuf_put_le16(msg, SHA256_MAC_LEN);
431 wpabuf_put_data(msg, hash, SHA256_MAC_LEN);
432 }
433 }
434
435
dpp_channel_ok_init(struct hostapd_hw_modes * own_modes,u16 num_modes,unsigned int freq)436 static int dpp_channel_ok_init(struct hostapd_hw_modes *own_modes,
437 u16 num_modes, unsigned int freq)
438 {
439 u16 m;
440 int c, flag;
441
442 if (!own_modes || !num_modes)
443 return 1;
444
445 for (m = 0; m < num_modes; m++) {
446 for (c = 0; c < own_modes[m].num_channels; c++) {
447 if ((unsigned int) own_modes[m].channels[c].freq !=
448 freq)
449 continue;
450 flag = own_modes[m].channels[c].flag;
451 if (!(flag & (HOSTAPD_CHAN_DISABLED |
452 HOSTAPD_CHAN_NO_IR |
453 HOSTAPD_CHAN_RADAR)))
454 return 1;
455 }
456 }
457
458 wpa_printf(MSG_DEBUG, "DPP: Peer channel %u MHz not supported", freq);
459 return 0;
460 }
461
462
freq_included(const unsigned int freqs[],unsigned int num,unsigned int freq)463 static int freq_included(const unsigned int freqs[], unsigned int num,
464 unsigned int freq)
465 {
466 while (num > 0) {
467 if (freqs[--num] == freq)
468 return 1;
469 }
470 return 0;
471 }
472
473
freq_to_start(unsigned int freqs[],unsigned int num,unsigned int freq)474 static void freq_to_start(unsigned int freqs[], unsigned int num,
475 unsigned int freq)
476 {
477 unsigned int i;
478
479 for (i = 0; i < num; i++) {
480 if (freqs[i] == freq)
481 break;
482 }
483 if (i == 0 || i >= num)
484 return;
485 os_memmove(&freqs[1], &freqs[0], i * sizeof(freqs[0]));
486 freqs[0] = freq;
487 }
488
489
dpp_channel_intersect(struct dpp_authentication * auth,struct hostapd_hw_modes * own_modes,u16 num_modes)490 static int dpp_channel_intersect(struct dpp_authentication *auth,
491 struct hostapd_hw_modes *own_modes,
492 u16 num_modes)
493 {
494 struct dpp_bootstrap_info *peer_bi = auth->peer_bi;
495 unsigned int i, freq;
496
497 for (i = 0; i < peer_bi->num_freq; i++) {
498 freq = peer_bi->freq[i];
499 if (freq_included(auth->freq, auth->num_freq, freq))
500 continue;
501 if (dpp_channel_ok_init(own_modes, num_modes, freq))
502 auth->freq[auth->num_freq++] = freq;
503 }
504 if (!auth->num_freq) {
505 wpa_printf(MSG_INFO,
506 "DPP: No available channels for initiating DPP Authentication");
507 return -1;
508 }
509 auth->curr_freq = auth->freq[0];
510 return 0;
511 }
512
513
dpp_channel_local_list(struct dpp_authentication * auth,struct hostapd_hw_modes * own_modes,u16 num_modes)514 static int dpp_channel_local_list(struct dpp_authentication *auth,
515 struct hostapd_hw_modes *own_modes,
516 u16 num_modes)
517 {
518 u16 m;
519 int c, flag;
520 unsigned int freq;
521
522 auth->num_freq = 0;
523
524 if (!own_modes || !num_modes) {
525 auth->freq[0] = 2412;
526 auth->freq[1] = 2437;
527 auth->freq[2] = 2462;
528 auth->num_freq = 3;
529 return 0;
530 }
531
532 for (m = 0; m < num_modes; m++) {
533 for (c = 0; c < own_modes[m].num_channels; c++) {
534 freq = own_modes[m].channels[c].freq;
535 flag = own_modes[m].channels[c].flag;
536 if (flag & (HOSTAPD_CHAN_DISABLED |
537 HOSTAPD_CHAN_NO_IR |
538 HOSTAPD_CHAN_RADAR))
539 continue;
540 if (freq_included(auth->freq, auth->num_freq, freq))
541 continue;
542 auth->freq[auth->num_freq++] = freq;
543 if (auth->num_freq == DPP_BOOTSTRAP_MAX_FREQ) {
544 m = num_modes;
545 break;
546 }
547 }
548 }
549
550 return auth->num_freq == 0 ? -1 : 0;
551 }
552
553
dpp_prepare_channel_list(struct dpp_authentication * auth,unsigned int neg_freq,struct hostapd_hw_modes * own_modes,u16 num_modes)554 int dpp_prepare_channel_list(struct dpp_authentication *auth,
555 unsigned int neg_freq,
556 struct hostapd_hw_modes *own_modes, u16 num_modes)
557 {
558 int res;
559 char freqs[DPP_BOOTSTRAP_MAX_FREQ * 6 + 10], *pos, *end;
560 unsigned int i;
561
562 if (!own_modes) {
563 if (!neg_freq)
564 return -1;
565 auth->num_freq = 1;
566 auth->freq[0] = neg_freq;
567 auth->curr_freq = neg_freq;
568 return 0;
569 }
570
571 if (auth->peer_bi->num_freq > 0)
572 res = dpp_channel_intersect(auth, own_modes, num_modes);
573 else
574 res = dpp_channel_local_list(auth, own_modes, num_modes);
575 if (res < 0)
576 return res;
577
578 /* Prioritize 2.4 GHz channels 6, 1, 11 (in this order) to hit the most
579 * likely channels first. */
580 freq_to_start(auth->freq, auth->num_freq, 2462);
581 freq_to_start(auth->freq, auth->num_freq, 2412);
582 freq_to_start(auth->freq, auth->num_freq, 2437);
583
584 auth->freq_idx = 0;
585 auth->curr_freq = auth->freq[0];
586
587 pos = freqs;
588 end = pos + sizeof(freqs);
589 for (i = 0; i < auth->num_freq; i++) {
590 res = os_snprintf(pos, end - pos, " %u", auth->freq[i]);
591 if (os_snprintf_error(end - pos, res))
592 break;
593 pos += res;
594 }
595 *pos = '\0';
596 wpa_printf(MSG_DEBUG, "DPP: Possible frequencies for initiating:%s",
597 freqs);
598
599 return 0;
600 }
601
602
dpp_gen_uri(struct dpp_bootstrap_info * bi)603 int dpp_gen_uri(struct dpp_bootstrap_info *bi)
604 {
605 char macstr[ETH_ALEN * 2 + 10];
606 size_t len;
607
608 len = 4; /* "DPP:" */
609 if (bi->chan)
610 len += 3 + os_strlen(bi->chan); /* C:...; */
611 if (is_zero_ether_addr(bi->mac_addr))
612 macstr[0] = '\0';
613 else
614 os_snprintf(macstr, sizeof(macstr), "M:" COMPACT_MACSTR ";",
615 MAC2STR(bi->mac_addr));
616 len += os_strlen(macstr); /* M:...; */
617 if (bi->info)
618 len += 3 + os_strlen(bi->info); /* I:...; */
619 #ifdef CONFIG_DPP2
620 len += 4; /* V:2; */
621 #endif /* CONFIG_DPP2 */
622 len += 4 + os_strlen(bi->pk); /* K:...;; */
623
624 os_free(bi->uri);
625 bi->uri = os_malloc(len + 1);
626 if (!bi->uri)
627 return -1;
628 os_snprintf(bi->uri, len + 1, "DPP:%s%s%s%s%s%s%s%sK:%s;;",
629 bi->chan ? "C:" : "", bi->chan ? bi->chan : "",
630 bi->chan ? ";" : "",
631 macstr,
632 bi->info ? "I:" : "", bi->info ? bi->info : "",
633 bi->info ? ";" : "",
634 DPP_VERSION == 3 ? "V:3;" :
635 (DPP_VERSION == 2 ? "V:2;" : ""),
636 bi->pk);
637 return 0;
638 }
639
640
641 struct dpp_authentication *
dpp_alloc_auth(struct dpp_global * dpp,void * msg_ctx)642 dpp_alloc_auth(struct dpp_global *dpp, void *msg_ctx)
643 {
644 struct dpp_authentication *auth;
645
646 auth = os_zalloc(sizeof(*auth));
647 if (!auth)
648 return NULL;
649 auth->global = dpp;
650 auth->msg_ctx = msg_ctx;
651 auth->conf_resp_status = 255;
652 return auth;
653 }
654
655
dpp_build_conf_req_attr(struct dpp_authentication * auth,const char * json)656 static struct wpabuf * dpp_build_conf_req_attr(struct dpp_authentication *auth,
657 const char *json)
658 {
659 size_t nonce_len;
660 size_t json_len, clear_len;
661 struct wpabuf *clear = NULL, *msg = NULL, *pe = NULL;
662 u8 *wrapped;
663 size_t attr_len;
664 #ifdef CONFIG_DPP3
665 u8 auth_i[DPP_MAX_HASH_LEN];
666 #endif /* CONFIG_DPP3 */
667
668 wpa_printf(MSG_DEBUG, "DPP: Build configuration request");
669
670 nonce_len = auth->curve->nonce_len;
671 if (random_get_bytes(auth->e_nonce, nonce_len)) {
672 wpa_printf(MSG_ERROR, "DPP: Failed to generate E-nonce");
673 goto fail;
674 }
675 wpa_hexdump(MSG_DEBUG, "DPP: E-nonce", auth->e_nonce, nonce_len);
676 json_len = os_strlen(json);
677 wpa_hexdump_ascii(MSG_DEBUG, "DPP: configRequest JSON", json, json_len);
678
679 /* { E-nonce, configAttrib }ke */
680 clear_len = 4 + nonce_len + 4 + json_len;
681 #ifdef CONFIG_DPP3
682 if (auth->waiting_new_key) {
683 pe = crypto_ec_key_get_pubkey_point(auth->own_protocol_key, 0);
684 if (!pe)
685 goto fail;
686 clear_len += 4 + wpabuf_len(pe);
687
688 if (dpp_derive_auth_i(auth, auth_i) < 0)
689 goto fail;
690 clear_len += 4 + auth->curve->hash_len;
691 }
692 #endif /* CONFIG_DPP3 */
693 clear = wpabuf_alloc(clear_len);
694 attr_len = 4 + clear_len + AES_BLOCK_SIZE;
695 #ifdef CONFIG_TESTING_OPTIONS
696 if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_CONF_REQ)
697 attr_len += 5;
698 #endif /* CONFIG_TESTING_OPTIONS */
699 msg = wpabuf_alloc(attr_len);
700 if (!clear || !msg)
701 goto fail;
702
703 #ifdef CONFIG_TESTING_OPTIONS
704 if (dpp_test == DPP_TEST_NO_E_NONCE_CONF_REQ) {
705 wpa_printf(MSG_INFO, "DPP: TESTING - no E-nonce");
706 goto skip_e_nonce;
707 }
708 if (dpp_test == DPP_TEST_INVALID_E_NONCE_CONF_REQ) {
709 wpa_printf(MSG_INFO, "DPP: TESTING - invalid E-nonce");
710 wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
711 wpabuf_put_le16(clear, nonce_len - 1);
712 wpabuf_put_data(clear, auth->e_nonce, nonce_len - 1);
713 goto skip_e_nonce;
714 }
715 if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_CONF_REQ) {
716 wpa_printf(MSG_INFO, "DPP: TESTING - no Wrapped Data");
717 goto skip_wrapped_data;
718 }
719 #endif /* CONFIG_TESTING_OPTIONS */
720
721 /* E-nonce */
722 wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
723 wpabuf_put_le16(clear, nonce_len);
724 wpabuf_put_data(clear, auth->e_nonce, nonce_len);
725
726 #ifdef CONFIG_TESTING_OPTIONS
727 skip_e_nonce:
728 if (dpp_test == DPP_TEST_NO_CONFIG_ATTR_OBJ_CONF_REQ) {
729 wpa_printf(MSG_INFO, "DPP: TESTING - no configAttrib");
730 goto skip_conf_attr_obj;
731 }
732 #endif /* CONFIG_TESTING_OPTIONS */
733
734 #ifdef CONFIG_DPP3
735 if (pe) {
736 wpa_printf(MSG_DEBUG, "DPP: Pe");
737 wpabuf_put_le16(clear, DPP_ATTR_I_PROTOCOL_KEY);
738 wpabuf_put_le16(clear, wpabuf_len(pe));
739 wpabuf_put_buf(clear, pe);
740 }
741 if (auth->waiting_new_key) {
742 wpa_printf(MSG_DEBUG, "DPP: Initiator Authentication Tag");
743 wpabuf_put_le16(clear, DPP_ATTR_I_AUTH_TAG);
744 wpabuf_put_le16(clear, auth->curve->hash_len);
745 wpabuf_put_data(clear, auth_i, auth->curve->hash_len);
746 }
747 #endif /* CONFIG_DPP3 */
748
749 /* configAttrib */
750 wpabuf_put_le16(clear, DPP_ATTR_CONFIG_ATTR_OBJ);
751 wpabuf_put_le16(clear, json_len);
752 wpabuf_put_data(clear, json, json_len);
753
754 #ifdef CONFIG_TESTING_OPTIONS
755 skip_conf_attr_obj:
756 #endif /* CONFIG_TESTING_OPTIONS */
757
758 wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
759 wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
760 wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
761
762 /* No AES-SIV AD */
763 wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear);
764 if (aes_siv_encrypt(auth->ke, auth->curve->hash_len,
765 wpabuf_head(clear), wpabuf_len(clear),
766 0, NULL, NULL, wrapped) < 0)
767 goto fail;
768 wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
769 wrapped, wpabuf_len(clear) + AES_BLOCK_SIZE);
770
771 #ifdef CONFIG_TESTING_OPTIONS
772 if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_CONF_REQ) {
773 wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
774 dpp_build_attr_status(msg, DPP_STATUS_OK);
775 }
776 skip_wrapped_data:
777 #endif /* CONFIG_TESTING_OPTIONS */
778
779 wpa_hexdump_buf(MSG_DEBUG,
780 "DPP: Configuration Request frame attributes", msg);
781 out:
782 wpabuf_free(clear);
783 wpabuf_free(pe);
784 return msg;
785
786 fail:
787 wpabuf_free(msg);
788 msg = NULL;
789 goto out;
790 }
791
792
dpp_write_adv_proto(struct wpabuf * buf)793 void dpp_write_adv_proto(struct wpabuf *buf)
794 {
795 /* Advertisement Protocol IE */
796 wpabuf_put_u8(buf, WLAN_EID_ADV_PROTO);
797 wpabuf_put_u8(buf, 8); /* Length */
798 wpabuf_put_u8(buf, 0x7f);
799 wpabuf_put_u8(buf, WLAN_EID_VENDOR_SPECIFIC);
800 wpabuf_put_u8(buf, 5);
801 wpabuf_put_be24(buf, OUI_WFA);
802 wpabuf_put_u8(buf, DPP_OUI_TYPE);
803 wpabuf_put_u8(buf, 0x01);
804 }
805
806
dpp_write_gas_query(struct wpabuf * buf,struct wpabuf * query)807 void dpp_write_gas_query(struct wpabuf *buf, struct wpabuf *query)
808 {
809 /* GAS Query */
810 wpabuf_put_le16(buf, wpabuf_len(query));
811 wpabuf_put_buf(buf, query);
812 }
813
814
dpp_build_conf_req(struct dpp_authentication * auth,const char * json)815 struct wpabuf * dpp_build_conf_req(struct dpp_authentication *auth,
816 const char *json)
817 {
818 struct wpabuf *buf, *conf_req;
819
820 conf_req = dpp_build_conf_req_attr(auth, json);
821 if (!conf_req) {
822 wpa_printf(MSG_DEBUG,
823 "DPP: No configuration request data available");
824 return NULL;
825 }
826
827 buf = gas_build_initial_req(0, 10 + 2 + wpabuf_len(conf_req));
828 if (!buf) {
829 wpabuf_free(conf_req);
830 return NULL;
831 }
832
833 dpp_write_adv_proto(buf);
834 dpp_write_gas_query(buf, conf_req);
835 wpabuf_free(conf_req);
836 wpa_hexdump_buf(MSG_MSGDUMP, "DPP: GAS Config Request", buf);
837
838 return buf;
839 }
840
841
dpp_build_conf_req_helper(struct dpp_authentication * auth,const char * name,enum dpp_netrole netrole,const char * mud_url,int * opclasses)842 struct wpabuf * dpp_build_conf_req_helper(struct dpp_authentication *auth,
843 const char *name,
844 enum dpp_netrole netrole,
845 const char *mud_url, int *opclasses)
846 {
847 size_t len, name_len;
848 const char *tech = "infra";
849 const char *dpp_name;
850 struct wpabuf *buf = NULL, *json = NULL;
851 char *csr = NULL;
852
853 #ifdef CONFIG_TESTING_OPTIONS
854 if (dpp_test == DPP_TEST_INVALID_CONFIG_ATTR_OBJ_CONF_REQ) {
855 static const char *bogus_tech = "knfra";
856
857 wpa_printf(MSG_INFO, "DPP: TESTING - invalid Config Attr");
858 tech = bogus_tech;
859 }
860 #endif /* CONFIG_TESTING_OPTIONS */
861
862 dpp_name = name ? name : "Test";
863 name_len = os_strlen(dpp_name);
864
865 len = 100 + name_len * 6 + 1 + int_array_len(opclasses) * 4;
866 if (mud_url && mud_url[0])
867 len += 10 + os_strlen(mud_url);
868 #ifdef CONFIG_DPP2
869 if (auth->csr) {
870 size_t csr_len;
871
872 csr = base64_encode_no_lf(wpabuf_head(auth->csr),
873 wpabuf_len(auth->csr), &csr_len);
874 if (!csr)
875 goto fail;
876 len += 30 + csr_len;
877 }
878 #endif /* CONFIG_DPP2 */
879 json = wpabuf_alloc(len);
880 if (!json)
881 goto fail;
882
883 json_start_object(json, NULL);
884 if (json_add_string_escape(json, "name", dpp_name, name_len) < 0)
885 goto fail;
886 json_value_sep(json);
887 json_add_string(json, "wi-fi_tech", tech);
888 json_value_sep(json);
889 json_add_string(json, "netRole", dpp_netrole_str(netrole));
890 if (mud_url && mud_url[0]) {
891 json_value_sep(json);
892 json_add_string(json, "mudurl", mud_url);
893 }
894 if (opclasses) {
895 int i;
896
897 json_value_sep(json);
898 json_start_array(json, "bandSupport");
899 for (i = 0; opclasses[i]; i++)
900 wpabuf_printf(json, "%s%u", i ? "," : "", opclasses[i]);
901 json_end_array(json);
902 }
903 if (csr) {
904 json_value_sep(json);
905 json_add_string(json, "pkcs10", csr);
906 }
907 json_end_object(json);
908
909 buf = dpp_build_conf_req(auth, wpabuf_head(json));
910 fail:
911 wpabuf_free(json);
912 os_free(csr);
913
914 return buf;
915 }
916
917
bin_str_eq(const char * val,size_t len,const char * cmp)918 static int bin_str_eq(const char *val, size_t len, const char *cmp)
919 {
920 return os_strlen(cmp) == len && os_memcmp(val, cmp, len) == 0;
921 }
922
923
dpp_configuration_alloc(const char * type)924 struct dpp_configuration * dpp_configuration_alloc(const char *type)
925 {
926 struct dpp_configuration *conf;
927 const char *end;
928 size_t len;
929
930 conf = os_zalloc(sizeof(*conf));
931 if (!conf)
932 goto fail;
933
934 end = os_strchr(type, ' ');
935 if (end)
936 len = end - type;
937 else
938 len = os_strlen(type);
939
940 if (bin_str_eq(type, len, "psk"))
941 conf->akm = DPP_AKM_PSK;
942 else if (bin_str_eq(type, len, "sae"))
943 conf->akm = DPP_AKM_SAE;
944 else if (bin_str_eq(type, len, "psk-sae") ||
945 bin_str_eq(type, len, "psk+sae"))
946 conf->akm = DPP_AKM_PSK_SAE;
947 else if (bin_str_eq(type, len, "sae-dpp") ||
948 bin_str_eq(type, len, "dpp+sae"))
949 conf->akm = DPP_AKM_SAE_DPP;
950 else if (bin_str_eq(type, len, "psk-sae-dpp") ||
951 bin_str_eq(type, len, "dpp+psk+sae"))
952 conf->akm = DPP_AKM_PSK_SAE_DPP;
953 else if (bin_str_eq(type, len, "dpp"))
954 conf->akm = DPP_AKM_DPP;
955 else if (bin_str_eq(type, len, "dot1x"))
956 conf->akm = DPP_AKM_DOT1X;
957 else
958 goto fail;
959
960 return conf;
961 fail:
962 dpp_configuration_free(conf);
963 return NULL;
964 }
965
966
dpp_akm_psk(enum dpp_akm akm)967 int dpp_akm_psk(enum dpp_akm akm)
968 {
969 return akm == DPP_AKM_PSK || akm == DPP_AKM_PSK_SAE ||
970 akm == DPP_AKM_PSK_SAE_DPP;
971 }
972
973
dpp_akm_sae(enum dpp_akm akm)974 int dpp_akm_sae(enum dpp_akm akm)
975 {
976 return akm == DPP_AKM_SAE || akm == DPP_AKM_PSK_SAE ||
977 akm == DPP_AKM_SAE_DPP || akm == DPP_AKM_PSK_SAE_DPP;
978 }
979
980
dpp_akm_legacy(enum dpp_akm akm)981 int dpp_akm_legacy(enum dpp_akm akm)
982 {
983 return akm == DPP_AKM_PSK || akm == DPP_AKM_PSK_SAE ||
984 akm == DPP_AKM_SAE;
985 }
986
987
dpp_akm_dpp(enum dpp_akm akm)988 int dpp_akm_dpp(enum dpp_akm akm)
989 {
990 return akm == DPP_AKM_DPP || akm == DPP_AKM_SAE_DPP ||
991 akm == DPP_AKM_PSK_SAE_DPP;
992 }
993
994
dpp_akm_ver2(enum dpp_akm akm)995 int dpp_akm_ver2(enum dpp_akm akm)
996 {
997 return akm == DPP_AKM_SAE_DPP || akm == DPP_AKM_PSK_SAE_DPP;
998 }
999
1000
dpp_configuration_valid(const struct dpp_configuration * conf)1001 int dpp_configuration_valid(const struct dpp_configuration *conf)
1002 {
1003 if (conf->ssid_len == 0)
1004 return 0;
1005 if (dpp_akm_psk(conf->akm) && !conf->passphrase && !conf->psk_set)
1006 return 0;
1007 if (dpp_akm_sae(conf->akm) && !conf->passphrase)
1008 return 0;
1009 return 1;
1010 }
1011
1012
dpp_configuration_free(struct dpp_configuration * conf)1013 void dpp_configuration_free(struct dpp_configuration *conf)
1014 {
1015 if (!conf)
1016 return;
1017 str_clear_free(conf->passphrase);
1018 os_free(conf->group_id);
1019 os_free(conf->csrattrs);
1020 bin_clear_free(conf, sizeof(*conf));
1021 }
1022
1023
dpp_configuration_parse_helper(struct dpp_authentication * auth,const char * cmd,int idx)1024 static int dpp_configuration_parse_helper(struct dpp_authentication *auth,
1025 const char *cmd, int idx)
1026 {
1027 const char *pos, *end;
1028 struct dpp_configuration *conf_sta = NULL, *conf_ap = NULL;
1029 struct dpp_configuration *conf = NULL;
1030 size_t len;
1031
1032 pos = os_strstr(cmd, " conf=sta-");
1033 if (pos) {
1034 conf_sta = dpp_configuration_alloc(pos + 10);
1035 if (!conf_sta)
1036 goto fail;
1037 conf_sta->netrole = DPP_NETROLE_STA;
1038 conf = conf_sta;
1039 }
1040
1041 pos = os_strstr(cmd, " conf=ap-");
1042 if (pos) {
1043 conf_ap = dpp_configuration_alloc(pos + 9);
1044 if (!conf_ap)
1045 goto fail;
1046 conf_ap->netrole = DPP_NETROLE_AP;
1047 conf = conf_ap;
1048 }
1049
1050 pos = os_strstr(cmd, " conf=configurator");
1051 if (pos)
1052 auth->provision_configurator = 1;
1053
1054 if (!conf)
1055 return 0;
1056
1057 pos = os_strstr(cmd, " ssid=");
1058 if (pos) {
1059 pos += 6;
1060 end = os_strchr(pos, ' ');
1061 conf->ssid_len = end ? (size_t) (end - pos) : os_strlen(pos);
1062 conf->ssid_len /= 2;
1063 if (conf->ssid_len > sizeof(conf->ssid) ||
1064 hexstr2bin(pos, conf->ssid, conf->ssid_len) < 0)
1065 goto fail;
1066 } else {
1067 #ifdef CONFIG_TESTING_OPTIONS
1068 /* use a default SSID for legacy testing reasons */
1069 os_memcpy(conf->ssid, "test", 4);
1070 conf->ssid_len = 4;
1071 #else /* CONFIG_TESTING_OPTIONS */
1072 goto fail;
1073 #endif /* CONFIG_TESTING_OPTIONS */
1074 }
1075
1076 pos = os_strstr(cmd, " ssid_charset=");
1077 if (pos) {
1078 if (conf_ap) {
1079 wpa_printf(MSG_INFO,
1080 "DPP: ssid64 option (ssid_charset param) not allowed for AP enrollee");
1081 goto fail;
1082 }
1083 conf->ssid_charset = atoi(pos + 14);
1084 }
1085
1086 pos = os_strstr(cmd, " pass=");
1087 if (pos) {
1088 size_t pass_len;
1089
1090 pos += 6;
1091 end = os_strchr(pos, ' ');
1092 pass_len = end ? (size_t) (end - pos) : os_strlen(pos);
1093 pass_len /= 2;
1094 if (pass_len > 63 || pass_len < 8)
1095 goto fail;
1096 conf->passphrase = os_zalloc(pass_len + 1);
1097 if (!conf->passphrase ||
1098 hexstr2bin(pos, (u8 *) conf->passphrase, pass_len) < 0)
1099 goto fail;
1100 }
1101
1102 pos = os_strstr(cmd, " psk=");
1103 if (pos) {
1104 pos += 5;
1105 if (hexstr2bin(pos, conf->psk, PMK_LEN) < 0)
1106 goto fail;
1107 conf->psk_set = 1;
1108 }
1109
1110 pos = os_strstr(cmd, " group_id=");
1111 if (pos) {
1112 size_t group_id_len;
1113
1114 pos += 10;
1115 end = os_strchr(pos, ' ');
1116 group_id_len = end ? (size_t) (end - pos) : os_strlen(pos);
1117 conf->group_id = os_malloc(group_id_len + 1);
1118 if (!conf->group_id)
1119 goto fail;
1120 os_memcpy(conf->group_id, pos, group_id_len);
1121 conf->group_id[group_id_len] = '\0';
1122 }
1123
1124 pos = os_strstr(cmd, " expiry=");
1125 if (pos) {
1126 long int val;
1127
1128 pos += 8;
1129 val = strtol(pos, NULL, 0);
1130 if (val <= 0)
1131 goto fail;
1132 conf->netaccesskey_expiry = val;
1133 }
1134
1135 pos = os_strstr(cmd, " csrattrs=");
1136 if (pos) {
1137 pos += 10;
1138 end = os_strchr(pos, ' ');
1139 len = end ? (size_t) (end - pos) : os_strlen(pos);
1140 conf->csrattrs = os_zalloc(len + 1);
1141 if (!conf->csrattrs)
1142 goto fail;
1143 os_memcpy(conf->csrattrs, pos, len);
1144 }
1145
1146 if (!dpp_configuration_valid(conf))
1147 goto fail;
1148
1149 if (idx == 0) {
1150 auth->conf_sta = conf_sta;
1151 auth->conf_ap = conf_ap;
1152 } else if (idx == 1) {
1153 auth->conf2_sta = conf_sta;
1154 auth->conf2_ap = conf_ap;
1155 } else {
1156 goto fail;
1157 }
1158 return 0;
1159
1160 fail:
1161 dpp_configuration_free(conf_sta);
1162 dpp_configuration_free(conf_ap);
1163 return -1;
1164 }
1165
1166
dpp_configuration_parse(struct dpp_authentication * auth,const char * cmd)1167 static int dpp_configuration_parse(struct dpp_authentication *auth,
1168 const char *cmd)
1169 {
1170 const char *pos;
1171 char *tmp;
1172 size_t len;
1173 int res;
1174
1175 pos = os_strstr(cmd, " @CONF-OBJ-SEP@ ");
1176 if (!pos)
1177 return dpp_configuration_parse_helper(auth, cmd, 0);
1178
1179 len = pos - cmd;
1180 tmp = os_malloc(len + 1);
1181 if (!tmp)
1182 goto fail;
1183 os_memcpy(tmp, cmd, len);
1184 tmp[len] = '\0';
1185 res = dpp_configuration_parse_helper(auth, cmd, 0);
1186 str_clear_free(tmp);
1187 if (res)
1188 goto fail;
1189 res = dpp_configuration_parse_helper(auth, cmd + len, 1);
1190 if (res)
1191 goto fail;
1192 return 0;
1193 fail:
1194 dpp_configuration_free(auth->conf_sta);
1195 dpp_configuration_free(auth->conf2_sta);
1196 dpp_configuration_free(auth->conf_ap);
1197 dpp_configuration_free(auth->conf2_ap);
1198 return -1;
1199 }
1200
1201
1202 static struct dpp_configurator *
dpp_configurator_get_id(struct dpp_global * dpp,unsigned int id)1203 dpp_configurator_get_id(struct dpp_global *dpp, unsigned int id)
1204 {
1205 struct dpp_configurator *conf;
1206
1207 if (!dpp)
1208 return NULL;
1209
1210 dl_list_for_each(conf, &dpp->configurator,
1211 struct dpp_configurator, list) {
1212 if (conf->id == id)
1213 return conf;
1214 }
1215 return NULL;
1216 }
1217
1218
dpp_set_configurator(struct dpp_authentication * auth,const char * cmd)1219 int dpp_set_configurator(struct dpp_authentication *auth, const char *cmd)
1220 {
1221 const char *pos;
1222 char *tmp = NULL;
1223 int ret = -1;
1224
1225 if (!cmd || auth->configurator_set)
1226 return 0;
1227 auth->configurator_set = 1;
1228
1229 if (cmd[0] != ' ') {
1230 size_t len;
1231
1232 len = os_strlen(cmd);
1233 tmp = os_malloc(len + 2);
1234 if (!tmp)
1235 goto fail;
1236 tmp[0] = ' ';
1237 os_memcpy(tmp + 1, cmd, len + 1);
1238 cmd = tmp;
1239 }
1240
1241 wpa_printf(MSG_DEBUG, "DPP: Set configurator parameters: %s", cmd);
1242
1243 if (os_strstr(cmd, " conf=query")) {
1244 auth->configurator_set = 0;
1245 auth->use_config_query = true;
1246 ret = 0;
1247 goto fail;
1248 }
1249
1250 pos = os_strstr(cmd, " configurator=");
1251 if (!auth->conf && pos) {
1252 pos += 14;
1253 auth->conf = dpp_configurator_get_id(auth->global, atoi(pos));
1254 if (!auth->conf) {
1255 wpa_printf(MSG_INFO,
1256 "DPP: Could not find the specified configurator");
1257 goto fail;
1258 }
1259 }
1260
1261 pos = os_strstr(cmd, " conn_status=");
1262 if (pos) {
1263 pos += 13;
1264 auth->send_conn_status = atoi(pos);
1265 }
1266
1267 pos = os_strstr(cmd, " akm_use_selector=");
1268 if (pos) {
1269 pos += 18;
1270 auth->akm_use_selector = atoi(pos);
1271 }
1272
1273 if (dpp_configuration_parse(auth, cmd) < 0) {
1274 wpa_msg(auth->msg_ctx, MSG_INFO,
1275 "DPP: Failed to set configurator parameters");
1276 goto fail;
1277 }
1278 ret = 0;
1279 fail:
1280 os_free(tmp);
1281 return ret;
1282 }
1283
1284
dpp_auth_deinit(struct dpp_authentication * auth)1285 void dpp_auth_deinit(struct dpp_authentication *auth)
1286 {
1287 unsigned int i;
1288
1289 if (!auth)
1290 return;
1291 dpp_configuration_free(auth->conf_ap);
1292 dpp_configuration_free(auth->conf2_ap);
1293 dpp_configuration_free(auth->conf_sta);
1294 dpp_configuration_free(auth->conf2_sta);
1295 crypto_ec_key_deinit(auth->own_protocol_key);
1296 crypto_ec_key_deinit(auth->peer_protocol_key);
1297 crypto_ec_key_deinit(auth->reconfig_old_protocol_key);
1298 wpabuf_free(auth->req_msg);
1299 wpabuf_free(auth->resp_msg);
1300 wpabuf_free(auth->conf_req);
1301 wpabuf_free(auth->reconfig_req_msg);
1302 wpabuf_free(auth->reconfig_resp_msg);
1303 for (i = 0; i < auth->num_conf_obj; i++) {
1304 struct dpp_config_obj *conf = &auth->conf_obj[i];
1305
1306 os_free(conf->connector);
1307 wpabuf_free(conf->c_sign_key);
1308 wpabuf_free(conf->certbag);
1309 wpabuf_free(conf->certs);
1310 wpabuf_free(conf->cacert);
1311 os_free(conf->server_name);
1312 wpabuf_free(conf->pp_key);
1313 }
1314 #ifdef CONFIG_DPP2
1315 dpp_free_asymmetric_key(auth->conf_key_pkg);
1316 os_free(auth->csrattrs);
1317 wpabuf_free(auth->csr);
1318 wpabuf_free(auth->priv_key);
1319 wpabuf_free(auth->cacert);
1320 wpabuf_free(auth->certbag);
1321 os_free(auth->trusted_eap_server_name);
1322 wpabuf_free(auth->conf_resp_tcp);
1323 #endif /* CONFIG_DPP2 */
1324 wpabuf_free(auth->net_access_key);
1325 dpp_bootstrap_info_free(auth->tmp_own_bi);
1326 if (auth->tmp_peer_bi) {
1327 dl_list_del(&auth->tmp_peer_bi->list);
1328 dpp_bootstrap_info_free(auth->tmp_peer_bi);
1329 }
1330 os_free(auth->e_name);
1331 os_free(auth->e_mud_url);
1332 os_free(auth->e_band_support);
1333 #ifdef CONFIG_TESTING_OPTIONS
1334 os_free(auth->config_obj_override);
1335 os_free(auth->discovery_override);
1336 os_free(auth->groups_override);
1337 #endif /* CONFIG_TESTING_OPTIONS */
1338 bin_clear_free(auth, sizeof(*auth));
1339 }
1340
1341
1342 static struct wpabuf *
dpp_build_conf_start(struct dpp_authentication * auth,struct dpp_configuration * conf,size_t tailroom)1343 dpp_build_conf_start(struct dpp_authentication *auth,
1344 struct dpp_configuration *conf, size_t tailroom)
1345 {
1346 struct wpabuf *buf;
1347
1348 #ifdef CONFIG_TESTING_OPTIONS
1349 if (auth->discovery_override)
1350 tailroom += os_strlen(auth->discovery_override);
1351 #endif /* CONFIG_TESTING_OPTIONS */
1352
1353 buf = wpabuf_alloc(200 + tailroom);
1354 if (!buf)
1355 return NULL;
1356 json_start_object(buf, NULL);
1357 json_add_string(buf, "wi-fi_tech", "infra");
1358 json_value_sep(buf);
1359 #ifdef CONFIG_TESTING_OPTIONS
1360 if (auth->discovery_override) {
1361 wpa_printf(MSG_DEBUG, "DPP: TESTING - discovery override: '%s'",
1362 auth->discovery_override);
1363 wpabuf_put_str(buf, "\"discovery\":");
1364 wpabuf_put_str(buf, auth->discovery_override);
1365 json_value_sep(buf);
1366 return buf;
1367 }
1368 #endif /* CONFIG_TESTING_OPTIONS */
1369 json_start_object(buf, "discovery");
1370 if (((!conf->ssid_charset || auth->peer_version < 2) &&
1371 json_add_string_escape(buf, "ssid", conf->ssid,
1372 conf->ssid_len) < 0) ||
1373 ((conf->ssid_charset && auth->peer_version >= 2) &&
1374 json_add_base64url(buf, "ssid64", conf->ssid,
1375 conf->ssid_len) < 0)) {
1376 wpabuf_free(buf);
1377 return NULL;
1378 }
1379 if (conf->ssid_charset > 0) {
1380 json_value_sep(buf);
1381 json_add_int(buf, "ssid_charset", conf->ssid_charset);
1382 }
1383 json_end_object(buf);
1384 json_value_sep(buf);
1385
1386 return buf;
1387 }
1388
1389
dpp_build_jwk(struct wpabuf * buf,const char * name,struct crypto_ec_key * key,const char * kid,const struct dpp_curve_params * curve)1390 int dpp_build_jwk(struct wpabuf *buf, const char *name,
1391 struct crypto_ec_key *key, const char *kid,
1392 const struct dpp_curve_params *curve)
1393 {
1394 struct wpabuf *pub;
1395 const u8 *pos;
1396 int ret = -1;
1397
1398 pub = crypto_ec_key_get_pubkey_point(key, 0);
1399 if (!pub)
1400 goto fail;
1401
1402 json_start_object(buf, name);
1403 json_add_string(buf, "kty", "EC");
1404 json_value_sep(buf);
1405 json_add_string(buf, "crv", curve->jwk_crv);
1406 json_value_sep(buf);
1407 pos = wpabuf_head(pub);
1408 if (json_add_base64url(buf, "x", pos, curve->prime_len) < 0)
1409 goto fail;
1410 json_value_sep(buf);
1411 pos += curve->prime_len;
1412 if (json_add_base64url(buf, "y", pos, curve->prime_len) < 0)
1413 goto fail;
1414 if (kid) {
1415 json_value_sep(buf);
1416 json_add_string(buf, "kid", kid);
1417 }
1418 json_end_object(buf);
1419 ret = 0;
1420 fail:
1421 wpabuf_free(pub);
1422 return ret;
1423 }
1424
1425
dpp_build_legacy_cred_params(struct wpabuf * buf,struct dpp_configuration * conf)1426 static void dpp_build_legacy_cred_params(struct wpabuf *buf,
1427 struct dpp_configuration *conf)
1428 {
1429 if (conf->passphrase && os_strlen(conf->passphrase) < 64) {
1430 json_add_string_escape(buf, "pass", conf->passphrase,
1431 os_strlen(conf->passphrase));
1432 } else if (conf->psk_set) {
1433 char psk[2 * sizeof(conf->psk) + 1];
1434
1435 wpa_snprintf_hex(psk, sizeof(psk),
1436 conf->psk, sizeof(conf->psk));
1437 json_add_string(buf, "psk_hex", psk);
1438 forced_memzero(psk, sizeof(psk));
1439 }
1440 }
1441
1442
dpp_netrole_str(enum dpp_netrole netrole)1443 const char * dpp_netrole_str(enum dpp_netrole netrole)
1444 {
1445 switch (netrole) {
1446 case DPP_NETROLE_STA:
1447 return "sta";
1448 case DPP_NETROLE_AP:
1449 return "ap";
1450 case DPP_NETROLE_CONFIGURATOR:
1451 return "configurator";
1452 default:
1453 return "??";
1454 }
1455 }
1456
1457
1458 static struct wpabuf *
dpp_build_conf_obj_dpp(struct dpp_authentication * auth,struct dpp_configuration * conf)1459 dpp_build_conf_obj_dpp(struct dpp_authentication *auth,
1460 struct dpp_configuration *conf)
1461 {
1462 struct wpabuf *buf = NULL;
1463 char *signed_conn = NULL;
1464 size_t tailroom;
1465 const struct dpp_curve_params *curve; /* C-sign-key curve */
1466 const struct dpp_curve_params *nak_curve; /* netAccessKey curve */
1467 struct wpabuf *dppcon = NULL;
1468 size_t extra_len = 1000;
1469 int incl_legacy;
1470 enum dpp_akm akm;
1471 const char *akm_str;
1472
1473 if (!auth->conf) {
1474 wpa_printf(MSG_INFO,
1475 "DPP: No configurator specified - cannot generate DPP config object");
1476 goto fail;
1477 }
1478 curve = auth->conf->curve;
1479 if (auth->new_curve && auth->new_key_received)
1480 nak_curve = auth->new_curve;
1481 else
1482 nak_curve = auth->curve;
1483
1484 akm = conf->akm;
1485 if (dpp_akm_ver2(akm) && auth->peer_version < 2) {
1486 wpa_printf(MSG_DEBUG,
1487 "DPP: Convert DPP+legacy credential to DPP-only for peer that does not support version 2");
1488 akm = DPP_AKM_DPP;
1489 }
1490
1491 #ifdef CONFIG_TESTING_OPTIONS
1492 if (auth->groups_override)
1493 extra_len += os_strlen(auth->groups_override);
1494 #endif /* CONFIG_TESTING_OPTIONS */
1495
1496 if (conf->group_id)
1497 extra_len += os_strlen(conf->group_id);
1498
1499 /* Connector (JSON dppCon object) */
1500 dppcon = wpabuf_alloc(extra_len + 2 * nak_curve->prime_len * 4 / 3);
1501 if (!dppcon)
1502 goto fail;
1503 #ifdef CONFIG_TESTING_OPTIONS
1504 if (auth->groups_override) {
1505 wpabuf_put_u8(dppcon, '{');
1506 if (auth->groups_override) {
1507 wpa_printf(MSG_DEBUG,
1508 "DPP: TESTING - groups override: '%s'",
1509 auth->groups_override);
1510 wpabuf_put_str(dppcon, "\"groups\":");
1511 wpabuf_put_str(dppcon, auth->groups_override);
1512 json_value_sep(dppcon);
1513 }
1514 goto skip_groups;
1515 }
1516 #endif /* CONFIG_TESTING_OPTIONS */
1517 json_start_object(dppcon, NULL);
1518 json_start_array(dppcon, "groups");
1519 json_start_object(dppcon, NULL);
1520 json_add_string(dppcon, "groupId",
1521 conf->group_id ? conf->group_id : "*");
1522 json_value_sep(dppcon);
1523 json_add_string(dppcon, "netRole", dpp_netrole_str(conf->netrole));
1524 json_end_object(dppcon);
1525 json_end_array(dppcon);
1526 json_value_sep(dppcon);
1527 #ifdef CONFIG_TESTING_OPTIONS
1528 skip_groups:
1529 #endif /* CONFIG_TESTING_OPTIONS */
1530 if (!auth->peer_protocol_key) {
1531 wpa_printf(MSG_DEBUG,
1532 "DPP: No peer protocol key available to build netAccessKey JWK");
1533 goto fail;
1534 }
1535 #ifdef CONFIG_DPP3
1536 if (auth->conf->net_access_key_curve &&
1537 auth->curve != auth->conf->net_access_key_curve &&
1538 !auth->new_key_received) {
1539 wpa_printf(MSG_DEBUG,
1540 "DPP: Peer protocol key curve (%s) does not match the required netAccessKey curve (%s) - %s",
1541 auth->curve->name,
1542 auth->conf->net_access_key_curve->name,
1543 auth->waiting_new_key ?
1544 "the required key not received" :
1545 "request a new key");
1546 if (auth->waiting_new_key)
1547 auth->waiting_new_key = false; /* failed */
1548 else
1549 auth->waiting_new_key = true;
1550 goto fail;
1551 }
1552 #endif /* CONFIG_DPP3 */
1553 if (dpp_build_jwk(dppcon, "netAccessKey", auth->peer_protocol_key, NULL,
1554 nak_curve) < 0) {
1555 wpa_printf(MSG_DEBUG, "DPP: Failed to build netAccessKey JWK");
1556 goto fail;
1557 }
1558 if (conf->netaccesskey_expiry) {
1559 struct os_tm tm;
1560 char expiry[30];
1561
1562 if (os_gmtime(conf->netaccesskey_expiry, &tm) < 0) {
1563 wpa_printf(MSG_DEBUG,
1564 "DPP: Failed to generate expiry string");
1565 goto fail;
1566 }
1567 os_snprintf(expiry, sizeof(expiry),
1568 "%04u-%02u-%02uT%02u:%02u:%02uZ",
1569 tm.year, tm.month, tm.day,
1570 tm.hour, tm.min, tm.sec);
1571 json_value_sep(dppcon);
1572 json_add_string(dppcon, "expiry", expiry);
1573 }
1574 #ifdef CONFIG_DPP3
1575 json_value_sep(dppcon);
1576 json_add_int(dppcon, "version", auth->peer_version);
1577 #endif /* CONFIG_DPP3 */
1578 json_end_object(dppcon);
1579 wpa_printf(MSG_DEBUG, "DPP: dppCon: %s",
1580 (const char *) wpabuf_head(dppcon));
1581
1582 signed_conn = dpp_sign_connector(auth->conf, dppcon);
1583 if (!signed_conn)
1584 goto fail;
1585
1586 incl_legacy = dpp_akm_psk(akm) || dpp_akm_sae(akm);
1587 tailroom = 1000;
1588 tailroom += 2 * curve->prime_len * 4 / 3 + os_strlen(auth->conf->kid);
1589 tailroom += os_strlen(signed_conn);
1590 if (incl_legacy)
1591 tailroom += 1000;
1592 if (akm == DPP_AKM_DOT1X) {
1593 if (auth->certbag)
1594 tailroom += 2 * wpabuf_len(auth->certbag);
1595 if (auth->cacert)
1596 tailroom += 2 * wpabuf_len(auth->cacert);
1597 if (auth->trusted_eap_server_name)
1598 tailroom += os_strlen(auth->trusted_eap_server_name);
1599 tailroom += 1000;
1600 }
1601 buf = dpp_build_conf_start(auth, conf, tailroom);
1602 if (!buf)
1603 goto fail;
1604
1605 if (auth->akm_use_selector && dpp_akm_ver2(akm))
1606 akm_str = dpp_akm_selector_str(akm);
1607 else
1608 akm_str = dpp_akm_str(akm);
1609 json_start_object(buf, "cred");
1610 json_add_string(buf, "akm", akm_str);
1611 json_value_sep(buf);
1612 if (incl_legacy) {
1613 dpp_build_legacy_cred_params(buf, conf);
1614 json_value_sep(buf);
1615 }
1616 if (akm == DPP_AKM_DOT1X) {
1617 json_start_object(buf, "entCreds");
1618 if (!auth->certbag)
1619 goto fail;
1620 json_add_base64(buf, "certBag", wpabuf_head(auth->certbag),
1621 wpabuf_len(auth->certbag));
1622 if (auth->cacert) {
1623 json_value_sep(buf);
1624 json_add_base64(buf, "caCert",
1625 wpabuf_head(auth->cacert),
1626 wpabuf_len(auth->cacert));
1627 }
1628 if (auth->trusted_eap_server_name) {
1629 json_value_sep(buf);
1630 json_add_string(buf, "trustedEapServerName",
1631 auth->trusted_eap_server_name);
1632 }
1633 json_value_sep(buf);
1634 json_start_array(buf, "eapMethods");
1635 wpabuf_printf(buf, "%d", EAP_TYPE_TLS);
1636 json_end_array(buf);
1637 json_end_object(buf);
1638 json_value_sep(buf);
1639 }
1640 wpabuf_put_str(buf, "\"signedConnector\":\"");
1641 wpabuf_put_str(buf, signed_conn);
1642 wpabuf_put_str(buf, "\"");
1643 json_value_sep(buf);
1644 if (dpp_build_jwk(buf, "csign", auth->conf->csign, auth->conf->kid,
1645 curve) < 0) {
1646 wpa_printf(MSG_DEBUG, "DPP: Failed to build csign JWK");
1647 goto fail;
1648 }
1649 #ifdef CONFIG_DPP2
1650 if (auth->peer_version >= 2 && auth->conf->pp_key) {
1651 json_value_sep(buf);
1652 if (dpp_build_jwk(buf, "ppKey", auth->conf->pp_key, NULL,
1653 curve) < 0) {
1654 wpa_printf(MSG_DEBUG, "DPP: Failed to build ppKey JWK");
1655 goto fail;
1656 }
1657 }
1658 #endif /* CONFIG_DPP2 */
1659
1660 json_end_object(buf);
1661 json_end_object(buf);
1662
1663 wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: Configuration Object",
1664 wpabuf_head(buf), wpabuf_len(buf));
1665
1666 #ifdef CONFIG_DPP3
1667 if (!auth->conf->net_access_key_curve) {
1668 /* All netAccessKey values used in the network will have to be
1669 * from the same curve for network introduction to work, so
1670 * hardcode the first used netAccessKey curve for consecutive
1671 * operations if there was no explicit configuration of which
1672 * curve to use. */
1673 wpa_printf(MSG_DEBUG,
1674 "DPP: Update Configurator to require netAccessKey curve %s based on first provisioning",
1675 nak_curve->name);
1676 auth->conf->net_access_key_curve = nak_curve;
1677 }
1678 #endif /* CONFIG_DPP3 */
1679
1680 out:
1681 os_free(signed_conn);
1682 wpabuf_free(dppcon);
1683 return buf;
1684 fail:
1685 wpa_printf(MSG_DEBUG, "DPP: Failed to build configuration object");
1686 wpabuf_free(buf);
1687 buf = NULL;
1688 goto out;
1689 }
1690
1691
1692 static struct wpabuf *
dpp_build_conf_obj_legacy(struct dpp_authentication * auth,struct dpp_configuration * conf)1693 dpp_build_conf_obj_legacy(struct dpp_authentication *auth,
1694 struct dpp_configuration *conf)
1695 {
1696 struct wpabuf *buf;
1697 const char *akm_str;
1698
1699 buf = dpp_build_conf_start(auth, conf, 1000);
1700 if (!buf)
1701 return NULL;
1702
1703 if (auth->akm_use_selector && dpp_akm_ver2(conf->akm))
1704 akm_str = dpp_akm_selector_str(conf->akm);
1705 else
1706 akm_str = dpp_akm_str(conf->akm);
1707 json_start_object(buf, "cred");
1708 json_add_string(buf, "akm", akm_str);
1709 json_value_sep(buf);
1710 dpp_build_legacy_cred_params(buf, conf);
1711 json_end_object(buf);
1712 json_end_object(buf);
1713
1714 wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: Configuration Object (legacy)",
1715 wpabuf_head(buf), wpabuf_len(buf));
1716
1717 return buf;
1718 }
1719
1720
dpp_get_peer_bi_id(struct dpp_authentication * auth)1721 static int dpp_get_peer_bi_id(struct dpp_authentication *auth)
1722 {
1723 struct dpp_bootstrap_info *bi;
1724
1725 if (auth->peer_bi)
1726 return auth->peer_bi->id;
1727 if (auth->tmp_peer_bi)
1728 return auth->tmp_peer_bi->id;
1729
1730 bi = os_zalloc(sizeof(*bi));
1731 if (!bi)
1732 return -1;
1733 bi->id = dpp_next_id(auth->global);
1734 dl_list_add(&auth->global->bootstrap, &bi->list);
1735 auth->tmp_peer_bi = bi;
1736 return bi->id;
1737 }
1738
1739
1740 static struct wpabuf *
dpp_build_conf_obj(struct dpp_authentication * auth,enum dpp_netrole netrole,int idx,bool cert_req)1741 dpp_build_conf_obj(struct dpp_authentication *auth, enum dpp_netrole netrole,
1742 int idx, bool cert_req)
1743 {
1744 struct dpp_configuration *conf = NULL;
1745
1746 #ifdef CONFIG_TESTING_OPTIONS
1747 if (auth->config_obj_override) {
1748 if (idx != 0)
1749 return NULL;
1750 wpa_printf(MSG_DEBUG, "DPP: Testing - Config Object override");
1751 return wpabuf_alloc_copy(auth->config_obj_override,
1752 os_strlen(auth->config_obj_override));
1753 }
1754 #endif /* CONFIG_TESTING_OPTIONS */
1755
1756 if (idx == 0) {
1757 if (netrole == DPP_NETROLE_STA)
1758 conf = auth->conf_sta;
1759 else if (netrole == DPP_NETROLE_AP)
1760 conf = auth->conf_ap;
1761 } else if (idx == 1) {
1762 if (netrole == DPP_NETROLE_STA)
1763 conf = auth->conf2_sta;
1764 else if (netrole == DPP_NETROLE_AP)
1765 conf = auth->conf2_ap;
1766 }
1767 if (!conf) {
1768 if (idx == 0) {
1769 if (auth->use_config_query) {
1770 wpa_printf(MSG_DEBUG,
1771 "DPP: No configuration available for Enrollee(%s) - waiting for configuration",
1772 dpp_netrole_str(netrole));
1773 auth->waiting_config = true;
1774 dpp_get_peer_bi_id(auth);
1775 return NULL;
1776 }
1777 wpa_printf(MSG_DEBUG,
1778 "DPP: No configuration available for Enrollee(%s) - reject configuration request",
1779 dpp_netrole_str(netrole));
1780 }
1781 return NULL;
1782 }
1783
1784 if (conf->akm == DPP_AKM_DOT1X) {
1785 if (!auth->conf) {
1786 wpa_printf(MSG_DEBUG,
1787 "DPP: No Configurator data available");
1788 return NULL;
1789 }
1790 if (!cert_req && !auth->certbag) {
1791 wpa_printf(MSG_DEBUG,
1792 "DPP: No certificate data available for dot1x configuration");
1793 return NULL;
1794 }
1795 return dpp_build_conf_obj_dpp(auth, conf);
1796 }
1797 if (dpp_akm_dpp(conf->akm) || (auth->peer_version >= 2 && auth->conf))
1798 return dpp_build_conf_obj_dpp(auth, conf);
1799 return dpp_build_conf_obj_legacy(auth, conf);
1800 }
1801
1802
1803 struct wpabuf *
dpp_build_conf_resp(struct dpp_authentication * auth,const u8 * e_nonce,u16 e_nonce_len,enum dpp_netrole netrole,bool cert_req)1804 dpp_build_conf_resp(struct dpp_authentication *auth, const u8 *e_nonce,
1805 u16 e_nonce_len, enum dpp_netrole netrole, bool cert_req)
1806 {
1807 struct wpabuf *conf = NULL, *conf2 = NULL, *env_data = NULL, *pc = NULL;
1808 size_t clear_len, attr_len;
1809 struct wpabuf *clear = NULL, *msg = NULL;
1810 u8 *wrapped;
1811 const u8 *addr[1];
1812 size_t len[1];
1813 enum dpp_status_error status;
1814
1815 if (auth->force_conf_resp_status != DPP_STATUS_OK) {
1816 status = auth->force_conf_resp_status;
1817 goto forced_status;
1818 }
1819
1820 if (netrole == DPP_NETROLE_CONFIGURATOR) {
1821 #ifdef CONFIG_DPP2
1822 env_data = dpp_build_enveloped_data(auth);
1823 #endif /* CONFIG_DPP2 */
1824 } else {
1825 conf = dpp_build_conf_obj(auth, netrole, 0, cert_req);
1826 if (conf) {
1827 wpa_hexdump_ascii(MSG_DEBUG,
1828 "DPP: configurationObject JSON",
1829 wpabuf_head(conf), wpabuf_len(conf));
1830 conf2 = dpp_build_conf_obj(auth, netrole, 1, cert_req);
1831 }
1832 }
1833
1834 if (!conf && auth->waiting_config)
1835 return NULL;
1836 if (conf || env_data)
1837 status = DPP_STATUS_OK;
1838 else if (!cert_req && netrole == DPP_NETROLE_STA && auth->conf_sta &&
1839 auth->conf_sta->akm == DPP_AKM_DOT1X && !auth->waiting_csr)
1840 status = DPP_STATUS_CSR_NEEDED;
1841 #ifdef CONFIG_DPP3
1842 else if (auth->waiting_new_key)
1843 status = DPP_STATUS_NEW_KEY_NEEDED;
1844 #endif /* CONFIG_DPP3 */
1845 else
1846 status = DPP_STATUS_CONFIGURE_FAILURE;
1847 forced_status:
1848 auth->conf_resp_status = status;
1849
1850 /* { E-nonce, configurationObject[, sendConnStatus]}ke */
1851 clear_len = 4 + e_nonce_len;
1852 if (conf)
1853 clear_len += 4 + wpabuf_len(conf);
1854 if (conf2)
1855 clear_len += 4 + wpabuf_len(conf2);
1856 if (env_data)
1857 clear_len += 4 + wpabuf_len(env_data);
1858 if (auth->peer_version >= 2 && auth->send_conn_status &&
1859 netrole == DPP_NETROLE_STA)
1860 clear_len += 4;
1861 if (status == DPP_STATUS_CSR_NEEDED && auth->conf_sta &&
1862 auth->conf_sta->csrattrs)
1863 clear_len += 4 + os_strlen(auth->conf_sta->csrattrs);
1864 #ifdef CONFIG_DPP3
1865 if (status == DPP_STATUS_NEW_KEY_NEEDED) {
1866 struct crypto_ec_key *new_pc;
1867
1868 clear_len += 6; /* Finite Cyclic Group attribute */
1869
1870 wpa_printf(MSG_DEBUG,
1871 "DPP: Generate a new own protocol key for the curve %s",
1872 auth->conf->net_access_key_curve->name);
1873 new_pc = dpp_gen_keypair(auth->conf->net_access_key_curve);
1874 if (!new_pc) {
1875 wpa_printf(MSG_DEBUG, "DPP: Failed to generate new Pc");
1876 return NULL;
1877 }
1878 pc = crypto_ec_key_get_pubkey_point(new_pc, 0);
1879 if (!pc) {
1880 crypto_ec_key_deinit(new_pc);
1881 return NULL;
1882 }
1883 crypto_ec_key_deinit(auth->own_protocol_key);
1884 auth->own_protocol_key = new_pc;
1885 auth->new_curve = auth->conf->net_access_key_curve;
1886 clear_len += 4 + wpabuf_len(pc);
1887 }
1888 #endif /* CONFIG_DPP3 */
1889 clear = wpabuf_alloc(clear_len);
1890 attr_len = 4 + 1 + 4 + clear_len + AES_BLOCK_SIZE;
1891 #ifdef CONFIG_TESTING_OPTIONS
1892 if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_CONF_RESP)
1893 attr_len += 5;
1894 #endif /* CONFIG_TESTING_OPTIONS */
1895 msg = wpabuf_alloc(attr_len);
1896 if (!clear || !msg)
1897 goto fail;
1898
1899 #ifdef CONFIG_TESTING_OPTIONS
1900 if (dpp_test == DPP_TEST_NO_E_NONCE_CONF_RESP) {
1901 wpa_printf(MSG_INFO, "DPP: TESTING - no E-nonce");
1902 goto skip_e_nonce;
1903 }
1904 if (dpp_test == DPP_TEST_E_NONCE_MISMATCH_CONF_RESP) {
1905 wpa_printf(MSG_INFO, "DPP: TESTING - E-nonce mismatch");
1906 wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
1907 wpabuf_put_le16(clear, e_nonce_len);
1908 wpabuf_put_data(clear, e_nonce, e_nonce_len - 1);
1909 wpabuf_put_u8(clear, e_nonce[e_nonce_len - 1] ^ 0x01);
1910 goto skip_e_nonce;
1911 }
1912 if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_CONF_RESP) {
1913 wpa_printf(MSG_INFO, "DPP: TESTING - no Wrapped Data");
1914 goto skip_wrapped_data;
1915 }
1916 #endif /* CONFIG_TESTING_OPTIONS */
1917
1918 /* E-nonce */
1919 wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
1920 wpabuf_put_le16(clear, e_nonce_len);
1921 wpabuf_put_data(clear, e_nonce, e_nonce_len);
1922
1923 #ifdef CONFIG_TESTING_OPTIONS
1924 skip_e_nonce:
1925 if (dpp_test == DPP_TEST_NO_CONFIG_OBJ_CONF_RESP) {
1926 wpa_printf(MSG_INFO, "DPP: TESTING - Config Object");
1927 goto skip_config_obj;
1928 }
1929 #endif /* CONFIG_TESTING_OPTIONS */
1930
1931 if (conf) {
1932 wpabuf_put_le16(clear, DPP_ATTR_CONFIG_OBJ);
1933 wpabuf_put_le16(clear, wpabuf_len(conf));
1934 wpabuf_put_buf(clear, conf);
1935 }
1936 if (auth->peer_version >= 2 && conf2) {
1937 wpabuf_put_le16(clear, DPP_ATTR_CONFIG_OBJ);
1938 wpabuf_put_le16(clear, wpabuf_len(conf2));
1939 wpabuf_put_buf(clear, conf2);
1940 } else if (conf2) {
1941 wpa_printf(MSG_DEBUG,
1942 "DPP: Second Config Object available, but peer does not support more than one");
1943 }
1944 if (env_data) {
1945 wpabuf_put_le16(clear, DPP_ATTR_ENVELOPED_DATA);
1946 wpabuf_put_le16(clear, wpabuf_len(env_data));
1947 wpabuf_put_buf(clear, env_data);
1948 }
1949
1950 if (auth->peer_version >= 2 && auth->send_conn_status &&
1951 netrole == DPP_NETROLE_STA && status == DPP_STATUS_OK) {
1952 wpa_printf(MSG_DEBUG, "DPP: sendConnStatus");
1953 wpabuf_put_le16(clear, DPP_ATTR_SEND_CONN_STATUS);
1954 wpabuf_put_le16(clear, 0);
1955 }
1956
1957 if (status == DPP_STATUS_CSR_NEEDED && auth->conf_sta &&
1958 auth->conf_sta->csrattrs) {
1959 auth->waiting_csr = true;
1960 wpa_printf(MSG_DEBUG, "DPP: CSR Attributes Request");
1961 wpabuf_put_le16(clear, DPP_ATTR_CSR_ATTR_REQ);
1962 wpabuf_put_le16(clear, os_strlen(auth->conf_sta->csrattrs));
1963 wpabuf_put_str(clear, auth->conf_sta->csrattrs);
1964 }
1965
1966 #ifdef CONFIG_DPP3
1967 if (status == DPP_STATUS_NEW_KEY_NEEDED && auth->conf &&
1968 auth->conf->net_access_key_curve) {
1969 u16 ike_group = auth->conf->net_access_key_curve->ike_group;
1970
1971 /* Finite Cyclic Group attribute */
1972 wpa_printf(MSG_DEBUG, "DPP: Finite Cyclic Group: %u",
1973 ike_group);
1974 wpabuf_put_le16(clear, DPP_ATTR_FINITE_CYCLIC_GROUP);
1975 wpabuf_put_le16(clear, 2);
1976 wpabuf_put_le16(clear, ike_group);
1977
1978 if (pc) {
1979 wpa_printf(MSG_DEBUG, "DPP: Pc");
1980 wpabuf_put_le16(clear, DPP_ATTR_R_PROTOCOL_KEY);
1981 wpabuf_put_le16(clear, wpabuf_len(pc));
1982 wpabuf_put_buf(clear, pc);
1983 }
1984 }
1985 #endif /* CONFIG_DPP3 */
1986
1987 #ifdef CONFIG_TESTING_OPTIONS
1988 skip_config_obj:
1989 if (dpp_test == DPP_TEST_NO_STATUS_CONF_RESP) {
1990 wpa_printf(MSG_INFO, "DPP: TESTING - Status");
1991 goto skip_status;
1992 }
1993 if (dpp_test == DPP_TEST_INVALID_STATUS_CONF_RESP) {
1994 wpa_printf(MSG_INFO, "DPP: TESTING - invalid Status");
1995 status = 255;
1996 }
1997 #endif /* CONFIG_TESTING_OPTIONS */
1998
1999 /* DPP Status */
2000 dpp_build_attr_status(msg, status);
2001
2002 #ifdef CONFIG_TESTING_OPTIONS
2003 skip_status:
2004 #endif /* CONFIG_TESTING_OPTIONS */
2005
2006 addr[0] = wpabuf_head(msg);
2007 len[0] = wpabuf_len(msg);
2008 wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD", addr[0], len[0]);
2009
2010 wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
2011 wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
2012 wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
2013
2014 wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear);
2015 if (aes_siv_encrypt(auth->ke, auth->curve->hash_len,
2016 wpabuf_head(clear), wpabuf_len(clear),
2017 1, addr, len, wrapped) < 0)
2018 goto fail;
2019 wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
2020 wrapped, wpabuf_len(clear) + AES_BLOCK_SIZE);
2021
2022 #ifdef CONFIG_TESTING_OPTIONS
2023 if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_CONF_RESP) {
2024 wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
2025 dpp_build_attr_status(msg, DPP_STATUS_OK);
2026 }
2027 skip_wrapped_data:
2028 #endif /* CONFIG_TESTING_OPTIONS */
2029
2030 wpa_hexdump_buf(MSG_DEBUG,
2031 "DPP: Configuration Response attributes", msg);
2032 out:
2033 wpabuf_clear_free(conf);
2034 wpabuf_clear_free(conf2);
2035 wpabuf_clear_free(env_data);
2036 wpabuf_clear_free(clear);
2037 wpabuf_free(pc);
2038
2039 return msg;
2040 fail:
2041 wpabuf_free(msg);
2042 msg = NULL;
2043 goto out;
2044 }
2045
2046
2047 struct wpabuf *
dpp_conf_req_rx(struct dpp_authentication * auth,const u8 * attr_start,size_t attr_len)2048 dpp_conf_req_rx(struct dpp_authentication *auth, const u8 *attr_start,
2049 size_t attr_len)
2050 {
2051 const u8 *wrapped_data, *e_nonce, *config_attr;
2052 u16 wrapped_data_len, e_nonce_len, config_attr_len;
2053 u8 *unwrapped = NULL;
2054 size_t unwrapped_len = 0;
2055 struct wpabuf *resp = NULL;
2056 struct json_token *root = NULL, *token;
2057 enum dpp_netrole netrole;
2058 struct wpabuf *cert_req = NULL;
2059 #ifdef CONFIG_DPP3
2060 const u8 *i_proto;
2061 u16 i_proto_len;
2062 #endif /* CONFIG_DPP3 */
2063
2064 #ifdef CONFIG_TESTING_OPTIONS
2065 if (dpp_test == DPP_TEST_STOP_AT_CONF_REQ) {
2066 wpa_printf(MSG_INFO,
2067 "DPP: TESTING - stop at Config Request");
2068 return NULL;
2069 }
2070 #endif /* CONFIG_TESTING_OPTIONS */
2071
2072 if (dpp_check_attrs(attr_start, attr_len) < 0) {
2073 dpp_auth_fail(auth, "Invalid attribute in config request");
2074 return NULL;
2075 }
2076
2077 wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA,
2078 &wrapped_data_len);
2079 if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
2080 dpp_auth_fail(auth,
2081 "Missing or invalid required Wrapped Data attribute");
2082 return NULL;
2083 }
2084
2085 wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
2086 wrapped_data, wrapped_data_len);
2087 unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
2088 unwrapped = os_malloc(unwrapped_len);
2089 if (!unwrapped)
2090 return NULL;
2091 if (aes_siv_decrypt(auth->ke, auth->curve->hash_len,
2092 wrapped_data, wrapped_data_len,
2093 0, NULL, NULL, unwrapped) < 0) {
2094 dpp_auth_fail(auth, "AES-SIV decryption failed");
2095 goto fail;
2096 }
2097 wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
2098 unwrapped, unwrapped_len);
2099
2100 if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
2101 dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
2102 goto fail;
2103 }
2104
2105 e_nonce = dpp_get_attr(unwrapped, unwrapped_len,
2106 DPP_ATTR_ENROLLEE_NONCE,
2107 &e_nonce_len);
2108 if (!e_nonce || e_nonce_len != auth->curve->nonce_len) {
2109 dpp_auth_fail(auth,
2110 "Missing or invalid Enrollee Nonce attribute");
2111 goto fail;
2112 }
2113 wpa_hexdump(MSG_DEBUG, "DPP: Enrollee Nonce", e_nonce, e_nonce_len);
2114 os_memcpy(auth->e_nonce, e_nonce, e_nonce_len);
2115
2116 #ifdef CONFIG_DPP3
2117 i_proto = dpp_get_attr(unwrapped, unwrapped_len,
2118 DPP_ATTR_I_PROTOCOL_KEY, &i_proto_len);
2119 if (i_proto && !auth->waiting_new_key) {
2120 dpp_auth_fail(auth,
2121 "Enrollee included a new protocol key even though one was not expected");
2122 goto fail;
2123 }
2124 if (i_proto) {
2125 struct crypto_ec_key *pe;
2126 u8 auth_i[DPP_MAX_HASH_LEN];
2127 const u8 *rx_auth_i;
2128 u16 rx_auth_i_len;
2129
2130 wpa_hexdump(MSG_MSGDUMP, "DPP: Initiator Protocol Key (new Pe)",
2131 i_proto, i_proto_len);
2132
2133 pe = dpp_set_pubkey_point(auth->own_protocol_key,
2134 i_proto, i_proto_len);
2135 if (!pe) {
2136 dpp_auth_fail(auth,
2137 "Invalid Initiator Protocol Key (Pe)");
2138 goto fail;
2139 }
2140 dpp_debug_print_key("New Peer Protocol Key (Pe)", pe);
2141 crypto_ec_key_deinit(auth->peer_protocol_key);
2142 auth->peer_protocol_key = pe;
2143 auth->new_key_received = true;
2144 auth->waiting_new_key = false;
2145
2146 if (dpp_derive_auth_i(auth, auth_i) < 0)
2147 goto fail;
2148
2149 rx_auth_i = dpp_get_attr(unwrapped, unwrapped_len,
2150 DPP_ATTR_I_AUTH_TAG, &rx_auth_i_len);
2151 if (!rx_auth_i) {
2152 dpp_auth_fail(auth,
2153 "Missing Initiator Authentication Tag");
2154 goto fail;
2155 }
2156 if (rx_auth_i_len != auth->curve->hash_len ||
2157 os_memcmp(rx_auth_i, auth_i, auth->curve->hash_len) != 0) {
2158 dpp_auth_fail(auth,
2159 "Mismatch in Initiator Authenticating Tag");
2160 wpa_hexdump(MSG_DEBUG, "DPP: Received Auth-I",
2161 rx_auth_i, rx_auth_i_len);
2162 wpa_hexdump(MSG_DEBUG, "DPP: Derived Auth-I'",
2163 auth_i, auth->curve->hash_len);
2164 goto fail;
2165 }
2166 }
2167 #endif /* CONFIG_DPP3 */
2168
2169 config_attr = dpp_get_attr(unwrapped, unwrapped_len,
2170 DPP_ATTR_CONFIG_ATTR_OBJ,
2171 &config_attr_len);
2172 if (!config_attr) {
2173 dpp_auth_fail(auth,
2174 "Missing or invalid Config Attributes attribute");
2175 goto fail;
2176 }
2177 wpa_hexdump_ascii(MSG_DEBUG, "DPP: Config Attributes",
2178 config_attr, config_attr_len);
2179
2180 root = json_parse((const char *) config_attr, config_attr_len);
2181 if (!root) {
2182 dpp_auth_fail(auth, "Could not parse Config Attributes");
2183 goto fail;
2184 }
2185
2186 token = json_get_member(root, "name");
2187 if (!token || token->type != JSON_STRING) {
2188 dpp_auth_fail(auth, "No Config Attributes - name");
2189 goto fail;
2190 }
2191 wpa_printf(MSG_DEBUG, "DPP: Enrollee name = '%s'", token->string);
2192 os_free(auth->e_name);
2193 auth->e_name = os_strdup(token->string);
2194
2195 token = json_get_member(root, "wi-fi_tech");
2196 if (!token || token->type != JSON_STRING) {
2197 dpp_auth_fail(auth, "No Config Attributes - wi-fi_tech");
2198 goto fail;
2199 }
2200 wpa_printf(MSG_DEBUG, "DPP: wi-fi_tech = '%s'", token->string);
2201 if (os_strcmp(token->string, "infra") != 0) {
2202 wpa_printf(MSG_DEBUG, "DPP: Unsupported wi-fi_tech '%s'",
2203 token->string);
2204 dpp_auth_fail(auth, "Unsupported wi-fi_tech");
2205 goto fail;
2206 }
2207
2208 token = json_get_member(root, "netRole");
2209 if (!token || token->type != JSON_STRING) {
2210 dpp_auth_fail(auth, "No Config Attributes - netRole");
2211 goto fail;
2212 }
2213 wpa_printf(MSG_DEBUG, "DPP: netRole = '%s'", token->string);
2214 if (os_strcmp(token->string, "sta") == 0) {
2215 netrole = DPP_NETROLE_STA;
2216 } else if (os_strcmp(token->string, "ap") == 0) {
2217 netrole = DPP_NETROLE_AP;
2218 } else if (os_strcmp(token->string, "configurator") == 0) {
2219 netrole = DPP_NETROLE_CONFIGURATOR;
2220 } else {
2221 wpa_printf(MSG_DEBUG, "DPP: Unsupported netRole '%s'",
2222 token->string);
2223 dpp_auth_fail(auth, "Unsupported netRole");
2224 goto fail;
2225 }
2226 auth->e_netrole = netrole;
2227
2228 token = json_get_member(root, "mudurl");
2229 if (token && token->type == JSON_STRING) {
2230 wpa_printf(MSG_DEBUG, "DPP: mudurl = '%s'", token->string);
2231 wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_MUD_URL "%s",
2232 token->string);
2233 os_free(auth->e_mud_url);
2234 auth->e_mud_url = os_strdup(token->string);
2235 }
2236
2237 token = json_get_member(root, "bandSupport");
2238 if (token && token->type == JSON_ARRAY) {
2239 int *opclass = NULL;
2240 char txt[200], *pos, *end;
2241 int i, res;
2242
2243 wpa_printf(MSG_DEBUG, "DPP: bandSupport");
2244 token = token->child;
2245 while (token) {
2246 if (token->type != JSON_NUMBER) {
2247 wpa_printf(MSG_DEBUG,
2248 "DPP: Invalid bandSupport array member type");
2249 } else {
2250 wpa_printf(MSG_DEBUG,
2251 "DPP: Supported global operating class: %d",
2252 token->number);
2253 int_array_add_unique(&opclass, token->number);
2254 }
2255 token = token->sibling;
2256 }
2257
2258 txt[0] = '\0';
2259 pos = txt;
2260 end = txt + sizeof(txt);
2261 for (i = 0; opclass && opclass[i]; i++) {
2262 res = os_snprintf(pos, end - pos, "%s%d",
2263 pos == txt ? "" : ",", opclass[i]);
2264 if (os_snprintf_error(end - pos, res)) {
2265 *pos = '\0';
2266 break;
2267 }
2268 pos += res;
2269 }
2270 os_free(auth->e_band_support);
2271 auth->e_band_support = opclass;
2272 wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_BAND_SUPPORT "%s",
2273 txt);
2274 }
2275
2276 #ifdef CONFIG_DPP2
2277 cert_req = json_get_member_base64(root, "pkcs10");
2278 if (cert_req) {
2279 char *txt;
2280 int id;
2281
2282 wpa_hexdump_buf(MSG_DEBUG, "DPP: CertificateRequest", cert_req);
2283 if (dpp_validate_csr(auth, cert_req) < 0) {
2284 wpa_printf(MSG_DEBUG, "DPP: CSR is not valid");
2285 auth->force_conf_resp_status = DPP_STATUS_CSR_BAD;
2286 goto cont;
2287 }
2288
2289 id = dpp_get_peer_bi_id(auth);
2290 if (id < 0)
2291 goto fail;
2292
2293 wpa_printf(MSG_DEBUG, "DPP: CSR is valid - forward to CA/RA");
2294 txt = base64_encode_no_lf(wpabuf_head(cert_req),
2295 wpabuf_len(cert_req), NULL);
2296 if (!txt)
2297 goto fail;
2298
2299 wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_CSR "peer=%d csr=%s",
2300 id, txt);
2301 os_free(txt);
2302 auth->waiting_csr = false;
2303 auth->waiting_cert = true;
2304 goto fail;
2305 }
2306 cont:
2307 #endif /* CONFIG_DPP2 */
2308
2309 resp = dpp_build_conf_resp(auth, e_nonce, e_nonce_len, netrole,
2310 cert_req);
2311
2312 fail:
2313 wpabuf_free(cert_req);
2314 json_free(root);
2315 os_free(unwrapped);
2316 return resp;
2317 }
2318
2319
dpp_parse_cred_legacy(struct dpp_config_obj * conf,struct json_token * cred)2320 static int dpp_parse_cred_legacy(struct dpp_config_obj *conf,
2321 struct json_token *cred)
2322 {
2323 struct json_token *pass, *psk_hex;
2324
2325 wpa_printf(MSG_DEBUG, "DPP: Legacy akm=psk credential");
2326
2327 pass = json_get_member(cred, "pass");
2328 psk_hex = json_get_member(cred, "psk_hex");
2329
2330 if (pass && pass->type == JSON_STRING) {
2331 size_t len = os_strlen(pass->string);
2332
2333 wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: Legacy passphrase",
2334 pass->string, len);
2335 if (len < 8 || len > 63)
2336 return -1;
2337 os_strlcpy(conf->passphrase, pass->string,
2338 sizeof(conf->passphrase));
2339 } else if (psk_hex && psk_hex->type == JSON_STRING) {
2340 if (dpp_akm_sae(conf->akm) && !dpp_akm_psk(conf->akm)) {
2341 wpa_printf(MSG_DEBUG,
2342 "DPP: Unexpected psk_hex with akm=sae");
2343 return -1;
2344 }
2345 if (os_strlen(psk_hex->string) != PMK_LEN * 2 ||
2346 hexstr2bin(psk_hex->string, conf->psk, PMK_LEN) < 0) {
2347 wpa_printf(MSG_DEBUG, "DPP: Invalid psk_hex encoding");
2348 return -1;
2349 }
2350 wpa_hexdump_key(MSG_DEBUG, "DPP: Legacy PSK",
2351 conf->psk, PMK_LEN);
2352 conf->psk_set = 1;
2353 } else {
2354 wpa_printf(MSG_DEBUG, "DPP: No pass or psk_hex strings found");
2355 return -1;
2356 }
2357
2358 if (dpp_akm_sae(conf->akm) && !conf->passphrase[0]) {
2359 wpa_printf(MSG_DEBUG, "DPP: No pass for sae found");
2360 return -1;
2361 }
2362
2363 return 0;
2364 }
2365
2366
dpp_parse_jwk(struct json_token * jwk,const struct dpp_curve_params ** key_curve)2367 struct crypto_ec_key * dpp_parse_jwk(struct json_token *jwk,
2368 const struct dpp_curve_params **key_curve)
2369 {
2370 struct json_token *token;
2371 const struct dpp_curve_params *curve;
2372 struct wpabuf *x = NULL, *y = NULL;
2373 struct crypto_ec_key *key = NULL;
2374
2375 token = json_get_member(jwk, "kty");
2376 if (!token || token->type != JSON_STRING) {
2377 wpa_printf(MSG_DEBUG, "DPP: No kty in JWK");
2378 goto fail;
2379 }
2380 if (os_strcmp(token->string, "EC") != 0) {
2381 wpa_printf(MSG_DEBUG, "DPP: Unexpected JWK kty '%s'",
2382 token->string);
2383 goto fail;
2384 }
2385
2386 token = json_get_member(jwk, "crv");
2387 if (!token || token->type != JSON_STRING) {
2388 wpa_printf(MSG_DEBUG, "DPP: No crv in JWK");
2389 goto fail;
2390 }
2391 curve = dpp_get_curve_jwk_crv(token->string);
2392 if (!curve) {
2393 wpa_printf(MSG_DEBUG, "DPP: Unsupported JWK crv '%s'",
2394 token->string);
2395 goto fail;
2396 }
2397
2398 x = json_get_member_base64url(jwk, "x");
2399 if (!x) {
2400 wpa_printf(MSG_DEBUG, "DPP: No x in JWK");
2401 goto fail;
2402 }
2403 wpa_hexdump_buf(MSG_DEBUG, "DPP: JWK x", x);
2404 if (wpabuf_len(x) != curve->prime_len) {
2405 wpa_printf(MSG_DEBUG,
2406 "DPP: Unexpected JWK x length %u (expected %u for curve %s)",
2407 (unsigned int) wpabuf_len(x),
2408 (unsigned int) curve->prime_len, curve->name);
2409 goto fail;
2410 }
2411
2412 y = json_get_member_base64url(jwk, "y");
2413 if (!y) {
2414 wpa_printf(MSG_DEBUG, "DPP: No y in JWK");
2415 goto fail;
2416 }
2417 wpa_hexdump_buf(MSG_DEBUG, "DPP: JWK y", y);
2418 if (wpabuf_len(y) != curve->prime_len) {
2419 wpa_printf(MSG_DEBUG,
2420 "DPP: Unexpected JWK y length %u (expected %u for curve %s)",
2421 (unsigned int) wpabuf_len(y),
2422 (unsigned int) curve->prime_len, curve->name);
2423 goto fail;
2424 }
2425
2426 key = crypto_ec_key_set_pub(curve->ike_group, wpabuf_head(x),
2427 wpabuf_head(y), wpabuf_len(x));
2428 if (!key)
2429 goto fail;
2430
2431 *key_curve = curve;
2432
2433 fail:
2434 wpabuf_free(x);
2435 wpabuf_free(y);
2436
2437 return key;
2438 }
2439
2440
dpp_key_expired(const char * timestamp,os_time_t * expiry)2441 int dpp_key_expired(const char *timestamp, os_time_t *expiry)
2442 {
2443 struct os_time now;
2444 unsigned int year, month, day, hour, min, sec;
2445 os_time_t utime;
2446 const char *pos;
2447
2448 /* ISO 8601 date and time:
2449 * <date>T<time>
2450 * YYYY-MM-DDTHH:MM:SSZ
2451 * YYYY-MM-DDTHH:MM:SS+03:00
2452 */
2453 if (os_strlen(timestamp) < 19) {
2454 wpa_printf(MSG_DEBUG,
2455 "DPP: Too short timestamp - assume expired key");
2456 return 1;
2457 }
2458 if (sscanf(timestamp, "%04u-%02u-%02uT%02u:%02u:%02u",
2459 &year, &month, &day, &hour, &min, &sec) != 6) {
2460 wpa_printf(MSG_DEBUG,
2461 "DPP: Failed to parse expiration day - assume expired key");
2462 return 1;
2463 }
2464
2465 if (os_mktime(year, month, day, hour, min, sec, &utime) < 0) {
2466 wpa_printf(MSG_DEBUG,
2467 "DPP: Invalid date/time information - assume expired key");
2468 return 1;
2469 }
2470
2471 pos = timestamp + 19;
2472 if (*pos == 'Z' || *pos == '\0') {
2473 /* In UTC - no need to adjust */
2474 } else if (*pos == '-' || *pos == '+') {
2475 int items;
2476
2477 /* Adjust local time to UTC */
2478 items = sscanf(pos + 1, "%02u:%02u", &hour, &min);
2479 if (items < 1) {
2480 wpa_printf(MSG_DEBUG,
2481 "DPP: Invalid time zone designator (%s) - assume expired key",
2482 pos);
2483 return 1;
2484 }
2485 if (*pos == '-')
2486 utime += 3600 * hour;
2487 if (*pos == '+')
2488 utime -= 3600 * hour;
2489 if (items > 1) {
2490 if (*pos == '-')
2491 utime += 60 * min;
2492 if (*pos == '+')
2493 utime -= 60 * min;
2494 }
2495 } else {
2496 wpa_printf(MSG_DEBUG,
2497 "DPP: Invalid time zone designator (%s) - assume expired key",
2498 pos);
2499 return 1;
2500 }
2501 if (expiry)
2502 *expiry = utime;
2503
2504 if (os_get_time(&now) < 0) {
2505 wpa_printf(MSG_DEBUG,
2506 "DPP: Cannot get current time - assume expired key");
2507 return 1;
2508 }
2509
2510 if (now.sec > utime) {
2511 wpa_printf(MSG_DEBUG, "DPP: Key has expired (%lu < %lu)",
2512 utime, now.sec);
2513 return 1;
2514 }
2515
2516 return 0;
2517 }
2518
2519
dpp_parse_connector(struct dpp_authentication * auth,struct dpp_config_obj * conf,const unsigned char * payload,u16 payload_len)2520 static int dpp_parse_connector(struct dpp_authentication *auth,
2521 struct dpp_config_obj *conf,
2522 const unsigned char *payload,
2523 u16 payload_len)
2524 {
2525 struct json_token *root, *groups, *netkey, *token;
2526 int ret = -1;
2527 struct crypto_ec_key *key = NULL;
2528 const struct dpp_curve_params *curve;
2529 unsigned int rules = 0;
2530
2531 root = json_parse((const char *) payload, payload_len);
2532 if (!root) {
2533 wpa_printf(MSG_DEBUG, "DPP: JSON parsing of connector failed");
2534 goto fail;
2535 }
2536
2537 groups = json_get_member(root, "groups");
2538 if (!groups || groups->type != JSON_ARRAY) {
2539 wpa_printf(MSG_DEBUG, "DPP: No groups array found");
2540 goto skip_groups;
2541 }
2542 for (token = groups->child; token; token = token->sibling) {
2543 struct json_token *id, *role;
2544
2545 id = json_get_member(token, "groupId");
2546 if (!id || id->type != JSON_STRING) {
2547 wpa_printf(MSG_DEBUG, "DPP: Missing groupId string");
2548 goto fail;
2549 }
2550
2551 role = json_get_member(token, "netRole");
2552 if (!role || role->type != JSON_STRING) {
2553 wpa_printf(MSG_DEBUG, "DPP: Missing netRole string");
2554 goto fail;
2555 }
2556 wpa_printf(MSG_DEBUG,
2557 "DPP: connector group: groupId='%s' netRole='%s'",
2558 id->string, role->string);
2559 rules++;
2560 }
2561 skip_groups:
2562
2563 if (!rules) {
2564 wpa_printf(MSG_DEBUG,
2565 "DPP: Connector includes no groups");
2566 goto fail;
2567 }
2568
2569 token = json_get_member(root, "expiry");
2570 if (!token || token->type != JSON_STRING) {
2571 wpa_printf(MSG_DEBUG,
2572 "DPP: No expiry string found - connector does not expire");
2573 } else {
2574 wpa_printf(MSG_DEBUG, "DPP: expiry = %s", token->string);
2575 if (dpp_key_expired(token->string,
2576 &auth->net_access_key_expiry)) {
2577 wpa_printf(MSG_DEBUG,
2578 "DPP: Connector (netAccessKey) has expired");
2579 goto fail;
2580 }
2581 }
2582
2583 netkey = json_get_member(root, "netAccessKey");
2584 if (!netkey || netkey->type != JSON_OBJECT) {
2585 wpa_printf(MSG_DEBUG, "DPP: No netAccessKey object found");
2586 goto fail;
2587 }
2588
2589 key = dpp_parse_jwk(netkey, &curve);
2590 if (!key)
2591 goto fail;
2592 dpp_debug_print_key("DPP: Received netAccessKey", key);
2593
2594 if (crypto_ec_key_cmp(key, auth->own_protocol_key)) {
2595 wpa_printf(MSG_DEBUG,
2596 "DPP: netAccessKey in connector does not match own protocol key");
2597 #ifdef CONFIG_TESTING_OPTIONS
2598 if (auth->ignore_netaccesskey_mismatch) {
2599 wpa_printf(MSG_DEBUG,
2600 "DPP: TESTING - skip netAccessKey mismatch");
2601 } else {
2602 goto fail;
2603 }
2604 #else /* CONFIG_TESTING_OPTIONS */
2605 goto fail;
2606 #endif /* CONFIG_TESTING_OPTIONS */
2607 }
2608
2609 ret = 0;
2610 fail:
2611 crypto_ec_key_deinit(key);
2612 json_free(root);
2613 return ret;
2614 }
2615
2616
dpp_copy_csign(struct dpp_config_obj * conf,struct crypto_ec_key * csign)2617 static void dpp_copy_csign(struct dpp_config_obj *conf,
2618 struct crypto_ec_key *csign)
2619 {
2620 struct wpabuf *c_sign_key;
2621
2622 c_sign_key = crypto_ec_key_get_subject_public_key(csign);
2623 if (!c_sign_key)
2624 return;
2625
2626 wpabuf_free(conf->c_sign_key);
2627 conf->c_sign_key = c_sign_key;
2628 }
2629
2630
dpp_copy_ppkey(struct dpp_config_obj * conf,struct crypto_ec_key * ppkey)2631 static void dpp_copy_ppkey(struct dpp_config_obj *conf,
2632 struct crypto_ec_key *ppkey)
2633 {
2634 struct wpabuf *pp_key;
2635
2636 pp_key = crypto_ec_key_get_subject_public_key(ppkey);
2637 if (!pp_key)
2638 return;
2639
2640 wpabuf_free(conf->pp_key);
2641 conf->pp_key = pp_key;
2642 }
2643
2644
dpp_copy_netaccesskey(struct dpp_authentication * auth,struct dpp_config_obj * conf)2645 static void dpp_copy_netaccesskey(struct dpp_authentication *auth,
2646 struct dpp_config_obj *conf)
2647 {
2648 struct wpabuf *net_access_key;
2649 struct crypto_ec_key *own_key;
2650
2651 own_key = auth->own_protocol_key;
2652 #ifdef CONFIG_DPP2
2653 if (auth->reconfig_connector_key == DPP_CONFIG_REUSEKEY &&
2654 auth->reconfig_old_protocol_key)
2655 own_key = auth->reconfig_old_protocol_key;
2656 #endif /* CONFIG_DPP2 */
2657
2658 net_access_key = crypto_ec_key_get_ecprivate_key(own_key, true);
2659 if (!net_access_key)
2660 return;
2661
2662 wpabuf_free(auth->net_access_key);
2663 auth->net_access_key = net_access_key;
2664 }
2665
2666
dpp_parse_cred_dpp(struct dpp_authentication * auth,struct dpp_config_obj * conf,struct json_token * cred)2667 static int dpp_parse_cred_dpp(struct dpp_authentication *auth,
2668 struct dpp_config_obj *conf,
2669 struct json_token *cred)
2670 {
2671 struct dpp_signed_connector_info info;
2672 struct json_token *token, *csign, *ppkey;
2673 int ret = -1;
2674 struct crypto_ec_key *csign_pub = NULL, *pp_pub = NULL;
2675 const struct dpp_curve_params *key_curve = NULL, *pp_curve = NULL;
2676 const char *signed_connector;
2677
2678 os_memset(&info, 0, sizeof(info));
2679
2680 if (dpp_akm_psk(conf->akm) || dpp_akm_sae(conf->akm)) {
2681 wpa_printf(MSG_DEBUG,
2682 "DPP: Legacy credential included in Connector credential");
2683 if (dpp_parse_cred_legacy(conf, cred) < 0)
2684 return -1;
2685 }
2686
2687 wpa_printf(MSG_DEBUG, "DPP: Connector credential");
2688
2689 csign = json_get_member(cred, "csign");
2690 if (!csign || csign->type != JSON_OBJECT) {
2691 wpa_printf(MSG_DEBUG, "DPP: No csign JWK in JSON");
2692 goto fail;
2693 }
2694
2695 csign_pub = dpp_parse_jwk(csign, &key_curve);
2696 if (!csign_pub) {
2697 wpa_printf(MSG_DEBUG, "DPP: Failed to parse csign JWK");
2698 goto fail;
2699 }
2700 dpp_debug_print_key("DPP: Received C-sign-key", csign_pub);
2701
2702 ppkey = json_get_member(cred, "ppKey");
2703 if (ppkey && ppkey->type == JSON_OBJECT) {
2704 pp_pub = dpp_parse_jwk(ppkey, &pp_curve);
2705 if (!pp_pub) {
2706 wpa_printf(MSG_DEBUG, "DPP: Failed to parse ppKey JWK");
2707 goto fail;
2708 }
2709 dpp_debug_print_key("DPP: Received ppKey", pp_pub);
2710 if (key_curve != pp_curve) {
2711 wpa_printf(MSG_DEBUG,
2712 "DPP: C-sign-key and ppKey do not use the same curve");
2713 goto fail;
2714 }
2715 }
2716
2717 token = json_get_member(cred, "signedConnector");
2718 if (!token || token->type != JSON_STRING) {
2719 wpa_printf(MSG_DEBUG, "DPP: No signedConnector string found");
2720 goto fail;
2721 }
2722 wpa_hexdump_ascii(MSG_DEBUG, "DPP: signedConnector",
2723 token->string, os_strlen(token->string));
2724 signed_connector = token->string;
2725
2726 if (os_strchr(signed_connector, '"') ||
2727 os_strchr(signed_connector, '\n')) {
2728 wpa_printf(MSG_DEBUG,
2729 "DPP: Unexpected character in signedConnector");
2730 goto fail;
2731 }
2732
2733 if (dpp_process_signed_connector(&info, csign_pub,
2734 signed_connector) != DPP_STATUS_OK)
2735 goto fail;
2736
2737 if (dpp_parse_connector(auth, conf,
2738 info.payload, info.payload_len) < 0) {
2739 wpa_printf(MSG_DEBUG, "DPP: Failed to parse connector");
2740 goto fail;
2741 }
2742
2743 os_free(conf->connector);
2744 conf->connector = os_strdup(signed_connector);
2745
2746 dpp_copy_csign(conf, csign_pub);
2747 if (pp_pub)
2748 dpp_copy_ppkey(conf, pp_pub);
2749 if (dpp_akm_dpp(conf->akm) || auth->peer_version >= 2)
2750 dpp_copy_netaccesskey(auth, conf);
2751
2752 ret = 0;
2753 fail:
2754 crypto_ec_key_deinit(csign_pub);
2755 crypto_ec_key_deinit(pp_pub);
2756 os_free(info.payload);
2757 return ret;
2758 }
2759
2760
2761 #ifdef CONFIG_DPP2
dpp_parse_cred_dot1x(struct dpp_authentication * auth,struct dpp_config_obj * conf,struct json_token * cred)2762 static int dpp_parse_cred_dot1x(struct dpp_authentication *auth,
2763 struct dpp_config_obj *conf,
2764 struct json_token *cred)
2765 {
2766 struct json_token *ent, *name;
2767
2768 ent = json_get_member(cred, "entCreds");
2769 if (!ent || ent->type != JSON_OBJECT) {
2770 dpp_auth_fail(auth, "No entCreds in JSON");
2771 return -1;
2772 }
2773
2774 conf->certbag = json_get_member_base64(ent, "certBag");
2775 if (!conf->certbag) {
2776 dpp_auth_fail(auth, "No certBag in JSON");
2777 return -1;
2778 }
2779 wpa_hexdump_buf(MSG_MSGDUMP, "DPP: Received certBag", conf->certbag);
2780 conf->certs = crypto_pkcs7_get_certificates(conf->certbag);
2781 if (!conf->certs) {
2782 dpp_auth_fail(auth, "No certificates in certBag");
2783 return -1;
2784 }
2785
2786 conf->cacert = json_get_member_base64(ent, "caCert");
2787 if (conf->cacert)
2788 wpa_hexdump_buf(MSG_MSGDUMP, "DPP: Received caCert",
2789 conf->cacert);
2790
2791 name = json_get_member(ent, "trustedEapServerName");
2792 if (name &&
2793 (name->type != JSON_STRING ||
2794 has_ctrl_char((const u8 *) name->string,
2795 os_strlen(name->string)))) {
2796 dpp_auth_fail(auth,
2797 "Invalid trustedEapServerName type in JSON");
2798 return -1;
2799 }
2800 if (name && name->string) {
2801 wpa_printf(MSG_DEBUG, "DPP: Received trustedEapServerName: %s",
2802 name->string);
2803 conf->server_name = os_strdup(name->string);
2804 if (!conf->server_name)
2805 return -1;
2806 }
2807
2808 return 0;
2809 }
2810 #endif /* CONFIG_DPP2 */
2811
2812
dpp_akm_str(enum dpp_akm akm)2813 const char * dpp_akm_str(enum dpp_akm akm)
2814 {
2815 switch (akm) {
2816 case DPP_AKM_DPP:
2817 return "dpp";
2818 case DPP_AKM_PSK:
2819 return "psk";
2820 case DPP_AKM_SAE:
2821 return "sae";
2822 case DPP_AKM_PSK_SAE:
2823 return "psk+sae";
2824 case DPP_AKM_SAE_DPP:
2825 return "dpp+sae";
2826 case DPP_AKM_PSK_SAE_DPP:
2827 return "dpp+psk+sae";
2828 case DPP_AKM_DOT1X:
2829 return "dot1x";
2830 default:
2831 return "??";
2832 }
2833 }
2834
2835
dpp_akm_selector_str(enum dpp_akm akm)2836 const char * dpp_akm_selector_str(enum dpp_akm akm)
2837 {
2838 switch (akm) {
2839 case DPP_AKM_DPP:
2840 return "506F9A02";
2841 case DPP_AKM_PSK:
2842 return "000FAC02+000FAC06";
2843 case DPP_AKM_SAE:
2844 return "000FAC08";
2845 case DPP_AKM_PSK_SAE:
2846 return "000FAC02+000FAC06+000FAC08";
2847 case DPP_AKM_SAE_DPP:
2848 return "506F9A02+000FAC08";
2849 case DPP_AKM_PSK_SAE_DPP:
2850 return "506F9A02+000FAC08+000FAC02+000FAC06";
2851 case DPP_AKM_DOT1X:
2852 return "000FAC01+000FAC05";
2853 default:
2854 return "??";
2855 }
2856 }
2857
2858
dpp_akm_from_str(const char * akm)2859 static enum dpp_akm dpp_akm_from_str(const char *akm)
2860 {
2861 const char *pos;
2862 int dpp = 0, psk = 0, sae = 0, dot1x = 0;
2863
2864 if (os_strcmp(akm, "psk") == 0)
2865 return DPP_AKM_PSK;
2866 if (os_strcmp(akm, "sae") == 0)
2867 return DPP_AKM_SAE;
2868 if (os_strcmp(akm, "psk+sae") == 0)
2869 return DPP_AKM_PSK_SAE;
2870 if (os_strcmp(akm, "dpp") == 0)
2871 return DPP_AKM_DPP;
2872 if (os_strcmp(akm, "dpp+sae") == 0)
2873 return DPP_AKM_SAE_DPP;
2874 if (os_strcmp(akm, "dpp+psk+sae") == 0)
2875 return DPP_AKM_PSK_SAE_DPP;
2876 if (os_strcmp(akm, "dot1x") == 0)
2877 return DPP_AKM_DOT1X;
2878
2879 pos = akm;
2880 while (*pos) {
2881 if (os_strlen(pos) < 8)
2882 break;
2883 if (os_strncasecmp(pos, "506F9A02", 8) == 0)
2884 dpp = 1;
2885 else if (os_strncasecmp(pos, "000FAC02", 8) == 0)
2886 psk = 1;
2887 else if (os_strncasecmp(pos, "000FAC06", 8) == 0)
2888 psk = 1;
2889 else if (os_strncasecmp(pos, "000FAC08", 8) == 0)
2890 sae = 1;
2891 else if (os_strncasecmp(pos, "000FAC01", 8) == 0)
2892 dot1x = 1;
2893 else if (os_strncasecmp(pos, "000FAC05", 8) == 0)
2894 dot1x = 1;
2895 pos += 8;
2896 if (*pos != '+')
2897 break;
2898 pos++;
2899 }
2900
2901 if (dpp && psk && sae)
2902 return DPP_AKM_PSK_SAE_DPP;
2903 if (dpp && sae)
2904 return DPP_AKM_SAE_DPP;
2905 if (dpp)
2906 return DPP_AKM_DPP;
2907 if (psk && sae)
2908 return DPP_AKM_PSK_SAE;
2909 if (sae)
2910 return DPP_AKM_SAE;
2911 if (psk)
2912 return DPP_AKM_PSK;
2913 if (dot1x)
2914 return DPP_AKM_DOT1X;
2915
2916 return DPP_AKM_UNKNOWN;
2917 }
2918
2919
dpp_parse_conf_obj(struct dpp_authentication * auth,const u8 * conf_obj,u16 conf_obj_len)2920 static int dpp_parse_conf_obj(struct dpp_authentication *auth,
2921 const u8 *conf_obj, u16 conf_obj_len)
2922 {
2923 int ret = -1;
2924 struct json_token *root, *token, *discovery, *cred;
2925 struct dpp_config_obj *conf;
2926 struct wpabuf *ssid64 = NULL;
2927 int legacy;
2928
2929 root = json_parse((const char *) conf_obj, conf_obj_len);
2930 if (!root)
2931 return -1;
2932 if (root->type != JSON_OBJECT) {
2933 dpp_auth_fail(auth, "JSON root is not an object");
2934 goto fail;
2935 }
2936
2937 token = json_get_member(root, "wi-fi_tech");
2938 if (!token || token->type != JSON_STRING) {
2939 dpp_auth_fail(auth, "No wi-fi_tech string value found");
2940 goto fail;
2941 }
2942 if (os_strcmp(token->string, "infra") != 0) {
2943 wpa_printf(MSG_DEBUG, "DPP: Unsupported wi-fi_tech value: '%s'",
2944 token->string);
2945 dpp_auth_fail(auth, "Unsupported wi-fi_tech value");
2946 goto fail;
2947 }
2948
2949 discovery = json_get_member(root, "discovery");
2950 if (!discovery || discovery->type != JSON_OBJECT) {
2951 dpp_auth_fail(auth, "No discovery object in JSON");
2952 goto fail;
2953 }
2954
2955 ssid64 = json_get_member_base64url(discovery, "ssid64");
2956 if (ssid64) {
2957 wpa_hexdump_ascii(MSG_DEBUG, "DPP: discovery::ssid64",
2958 wpabuf_head(ssid64), wpabuf_len(ssid64));
2959 if (wpabuf_len(ssid64) > SSID_MAX_LEN) {
2960 dpp_auth_fail(auth, "Too long discovery::ssid64 value");
2961 goto fail;
2962 }
2963 } else {
2964 token = json_get_member(discovery, "ssid");
2965 if (!token || token->type != JSON_STRING) {
2966 dpp_auth_fail(auth,
2967 "No discovery::ssid string value found");
2968 goto fail;
2969 }
2970 wpa_hexdump_ascii(MSG_DEBUG, "DPP: discovery::ssid",
2971 token->string, os_strlen(token->string));
2972 if (os_strlen(token->string) > SSID_MAX_LEN) {
2973 dpp_auth_fail(auth,
2974 "Too long discovery::ssid string value");
2975 goto fail;
2976 }
2977 }
2978
2979 if (auth->num_conf_obj == DPP_MAX_CONF_OBJ) {
2980 wpa_printf(MSG_DEBUG,
2981 "DPP: No room for this many Config Objects - ignore this one");
2982 ret = 0;
2983 goto fail;
2984 }
2985 conf = &auth->conf_obj[auth->num_conf_obj++];
2986
2987 if (ssid64) {
2988 conf->ssid_len = wpabuf_len(ssid64);
2989 os_memcpy(conf->ssid, wpabuf_head(ssid64), conf->ssid_len);
2990 } else {
2991 conf->ssid_len = os_strlen(token->string);
2992 os_memcpy(conf->ssid, token->string, conf->ssid_len);
2993 }
2994
2995 token = json_get_member(discovery, "ssid_charset");
2996 if (token && token->type == JSON_NUMBER) {
2997 conf->ssid_charset = token->number;
2998 wpa_printf(MSG_DEBUG, "DPP: ssid_charset=%d",
2999 conf->ssid_charset);
3000 }
3001
3002 cred = json_get_member(root, "cred");
3003 if (!cred || cred->type != JSON_OBJECT) {
3004 dpp_auth_fail(auth, "No cred object in JSON");
3005 goto fail;
3006 }
3007
3008 token = json_get_member(cred, "akm");
3009 if (!token || token->type != JSON_STRING) {
3010 dpp_auth_fail(auth, "No cred::akm string value found");
3011 goto fail;
3012 }
3013 conf->akm = dpp_akm_from_str(token->string);
3014
3015 legacy = dpp_akm_legacy(conf->akm);
3016 if (legacy && auth->peer_version >= 2) {
3017 struct json_token *csign, *s_conn;
3018
3019 csign = json_get_member(cred, "csign");
3020 s_conn = json_get_member(cred, "signedConnector");
3021 if (csign && csign->type == JSON_OBJECT &&
3022 s_conn && s_conn->type == JSON_STRING)
3023 legacy = 0;
3024 }
3025 if (legacy) {
3026 if (dpp_parse_cred_legacy(conf, cred) < 0)
3027 goto fail;
3028 } else if (dpp_akm_dpp(conf->akm) ||
3029 (auth->peer_version >= 2 && dpp_akm_legacy(conf->akm))) {
3030 if (dpp_parse_cred_dpp(auth, conf, cred) < 0)
3031 goto fail;
3032 #ifdef CONFIG_DPP2
3033 } else if (conf->akm == DPP_AKM_DOT1X) {
3034 if (dpp_parse_cred_dot1x(auth, conf, cred) < 0 ||
3035 dpp_parse_cred_dpp(auth, conf, cred) < 0)
3036 goto fail;
3037 #endif /* CONFIG_DPP2 */
3038 } else {
3039 wpa_printf(MSG_DEBUG, "DPP: Unsupported akm: %s",
3040 token->string);
3041 dpp_auth_fail(auth, "Unsupported akm");
3042 goto fail;
3043 }
3044
3045 wpa_printf(MSG_DEBUG, "DPP: JSON parsing completed successfully");
3046 ret = 0;
3047 fail:
3048 wpabuf_free(ssid64);
3049 json_free(root);
3050 return ret;
3051 }
3052
3053
3054 #ifdef CONFIG_DPP2
dpp_get_csr_attrs(const u8 * attrs,size_t attrs_len,size_t * len)3055 static u8 * dpp_get_csr_attrs(const u8 *attrs, size_t attrs_len, size_t *len)
3056 {
3057 const u8 *b64;
3058 u16 b64_len;
3059
3060 b64 = dpp_get_attr(attrs, attrs_len, DPP_ATTR_CSR_ATTR_REQ, &b64_len);
3061 if (!b64)
3062 return NULL;
3063 return base64_decode((const char *) b64, b64_len, len);
3064 }
3065 #endif /* CONFIG_DPP2 */
3066
3067
dpp_conf_resp_rx(struct dpp_authentication * auth,const struct wpabuf * resp)3068 int dpp_conf_resp_rx(struct dpp_authentication *auth,
3069 const struct wpabuf *resp)
3070 {
3071 const u8 *wrapped_data, *e_nonce, *status, *conf_obj;
3072 u16 wrapped_data_len, e_nonce_len, status_len, conf_obj_len;
3073 const u8 *env_data;
3074 u16 env_data_len;
3075 const u8 *addr[1];
3076 size_t len[1];
3077 u8 *unwrapped = NULL;
3078 size_t unwrapped_len = 0;
3079 int ret = -1;
3080
3081 auth->conf_resp_status = 255;
3082
3083 if (dpp_check_attrs(wpabuf_head(resp), wpabuf_len(resp)) < 0) {
3084 dpp_auth_fail(auth, "Invalid attribute in config response");
3085 return -1;
3086 }
3087
3088 wrapped_data = dpp_get_attr(wpabuf_head(resp), wpabuf_len(resp),
3089 DPP_ATTR_WRAPPED_DATA,
3090 &wrapped_data_len);
3091 if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
3092 dpp_auth_fail(auth,
3093 "Missing or invalid required Wrapped Data attribute");
3094 return -1;
3095 }
3096
3097 wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
3098 wrapped_data, wrapped_data_len);
3099 unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
3100 unwrapped = os_malloc(unwrapped_len);
3101 if (!unwrapped)
3102 return -1;
3103
3104 addr[0] = wpabuf_head(resp);
3105 len[0] = wrapped_data - 4 - (const u8 *) wpabuf_head(resp);
3106 wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD", addr[0], len[0]);
3107
3108 if (aes_siv_decrypt(auth->ke, auth->curve->hash_len,
3109 wrapped_data, wrapped_data_len,
3110 1, addr, len, unwrapped) < 0) {
3111 dpp_auth_fail(auth, "AES-SIV decryption failed");
3112 goto fail;
3113 }
3114 wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
3115 unwrapped, unwrapped_len);
3116
3117 if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
3118 dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
3119 goto fail;
3120 }
3121
3122 e_nonce = dpp_get_attr(unwrapped, unwrapped_len,
3123 DPP_ATTR_ENROLLEE_NONCE,
3124 &e_nonce_len);
3125 if (!e_nonce || e_nonce_len != auth->curve->nonce_len) {
3126 dpp_auth_fail(auth,
3127 "Missing or invalid Enrollee Nonce attribute");
3128 goto fail;
3129 }
3130 wpa_hexdump(MSG_DEBUG, "DPP: Enrollee Nonce", e_nonce, e_nonce_len);
3131 if (os_memcmp(e_nonce, auth->e_nonce, e_nonce_len) != 0) {
3132 dpp_auth_fail(auth, "Enrollee Nonce mismatch");
3133 goto fail;
3134 }
3135
3136 status = dpp_get_attr(wpabuf_head(resp), wpabuf_len(resp),
3137 DPP_ATTR_STATUS, &status_len);
3138 if (!status || status_len < 1) {
3139 dpp_auth_fail(auth,
3140 "Missing or invalid required DPP Status attribute");
3141 goto fail;
3142 }
3143 auth->conf_resp_status = status[0];
3144 wpa_printf(MSG_DEBUG, "DPP: Status %u", status[0]);
3145 #ifdef CONFIG_DPP2
3146 if (status[0] == DPP_STATUS_CSR_NEEDED) {
3147 u8 *csrattrs;
3148 size_t csrattrs_len;
3149
3150 wpa_printf(MSG_DEBUG, "DPP: Configurator requested CSR");
3151
3152 csrattrs = dpp_get_csr_attrs(unwrapped, unwrapped_len,
3153 &csrattrs_len);
3154 if (!csrattrs) {
3155 dpp_auth_fail(auth,
3156 "Missing or invalid CSR Attributes Request attribute");
3157 goto fail;
3158 }
3159 wpa_hexdump(MSG_DEBUG, "DPP: CsrAttrs", csrattrs, csrattrs_len);
3160 os_free(auth->csrattrs);
3161 auth->csrattrs = csrattrs;
3162 auth->csrattrs_len = csrattrs_len;
3163 ret = -2;
3164 goto fail;
3165 }
3166 #endif /* CONFIG_DPP2 */
3167 #ifdef CONFIG_DPP3
3168 if (status[0] == DPP_STATUS_NEW_KEY_NEEDED) {
3169 const u8 *fcgroup, *r_proto;
3170 u16 fcgroup_len, r_proto_len;
3171 u16 group;
3172 const struct dpp_curve_params *curve;
3173 struct crypto_ec_key *new_pe;
3174 struct crypto_ec_key *pc;
3175
3176 fcgroup = dpp_get_attr(unwrapped, unwrapped_len,
3177 DPP_ATTR_FINITE_CYCLIC_GROUP,
3178 &fcgroup_len);
3179 if (!fcgroup || fcgroup_len != 2) {
3180 dpp_auth_fail(auth,
3181 "Missing or invalid required Finite Cyclic Group attribute");
3182 goto fail;
3183 }
3184 group = WPA_GET_LE16(fcgroup);
3185
3186 wpa_printf(MSG_DEBUG,
3187 "DPP: Configurator requested a new protocol key from group %u",
3188 group);
3189 curve = dpp_get_curve_ike_group(group);
3190 if (!curve) {
3191 dpp_auth_fail(auth,
3192 "Unsupported group for new protocol key");
3193 goto fail;
3194 }
3195
3196 new_pe = dpp_gen_keypair(curve);
3197 if (!new_pe) {
3198 dpp_auth_fail(auth,
3199 "Failed to generate a new protocol key");
3200 goto fail;
3201 }
3202
3203 crypto_ec_key_deinit(auth->own_protocol_key);
3204 auth->own_protocol_key = new_pe;
3205 auth->new_curve = curve;
3206
3207 r_proto = dpp_get_attr(unwrapped, unwrapped_len,
3208 DPP_ATTR_R_PROTOCOL_KEY,
3209 &r_proto_len);
3210 if (!r_proto) {
3211 dpp_auth_fail(auth,
3212 "Missing required Responder Protocol Key attribute (Pc)");
3213 goto fail;
3214 }
3215 wpa_hexdump(MSG_MSGDUMP, "DPP: Responder Protocol Key (new Pc)",
3216 r_proto, r_proto_len);
3217
3218 pc = dpp_set_pubkey_point(new_pe, r_proto, r_proto_len);
3219 if (!pc) {
3220 dpp_auth_fail(auth, "Invalid Responder Protocol Key (Pc)");
3221 goto fail;
3222 }
3223 dpp_debug_print_key("New Peer Protocol Key (Pc)", pc);
3224
3225 crypto_ec_key_deinit(auth->peer_protocol_key);
3226 auth->peer_protocol_key = pc;
3227
3228 auth->waiting_new_key = true;
3229 ret = -3;
3230 goto fail;
3231 }
3232 #endif /* CONFIG_DPP3 */
3233 if (status[0] != DPP_STATUS_OK) {
3234 dpp_auth_fail(auth, "Configurator rejected configuration");
3235 goto fail;
3236 }
3237
3238 env_data = dpp_get_attr(unwrapped, unwrapped_len,
3239 DPP_ATTR_ENVELOPED_DATA, &env_data_len);
3240 #ifdef CONFIG_DPP2
3241 if (env_data &&
3242 dpp_conf_resp_env_data(auth, env_data, env_data_len) < 0)
3243 goto fail;
3244 #endif /* CONFIG_DPP2 */
3245
3246 conf_obj = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_CONFIG_OBJ,
3247 &conf_obj_len);
3248 if (!conf_obj && !env_data) {
3249 dpp_auth_fail(auth,
3250 "Missing required Configuration Object attribute");
3251 goto fail;
3252 }
3253 while (conf_obj) {
3254 wpa_hexdump_ascii(MSG_DEBUG, "DPP: configurationObject JSON",
3255 conf_obj, conf_obj_len);
3256 if (dpp_parse_conf_obj(auth, conf_obj, conf_obj_len) < 0)
3257 goto fail;
3258 conf_obj = dpp_get_attr_next(conf_obj, unwrapped, unwrapped_len,
3259 DPP_ATTR_CONFIG_OBJ,
3260 &conf_obj_len);
3261 }
3262
3263 #ifdef CONFIG_DPP2
3264 status = dpp_get_attr(unwrapped, unwrapped_len,
3265 DPP_ATTR_SEND_CONN_STATUS, &status_len);
3266 if (status) {
3267 wpa_printf(MSG_DEBUG,
3268 "DPP: Configurator requested connection status result");
3269 auth->conn_status_requested = 1;
3270 }
3271 #endif /* CONFIG_DPP2 */
3272
3273 ret = 0;
3274
3275 fail:
3276 os_free(unwrapped);
3277 return ret;
3278 }
3279
3280
3281 #ifdef CONFIG_DPP2
3282
dpp_conf_result_rx(struct dpp_authentication * auth,const u8 * hdr,const u8 * attr_start,size_t attr_len)3283 enum dpp_status_error dpp_conf_result_rx(struct dpp_authentication *auth,
3284 const u8 *hdr,
3285 const u8 *attr_start, size_t attr_len)
3286 {
3287 const u8 *wrapped_data, *status, *e_nonce;
3288 u16 wrapped_data_len, status_len, e_nonce_len;
3289 const u8 *addr[2];
3290 size_t len[2];
3291 u8 *unwrapped = NULL;
3292 size_t unwrapped_len = 0;
3293 enum dpp_status_error ret = 255;
3294
3295 wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA,
3296 &wrapped_data_len);
3297 if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
3298 dpp_auth_fail(auth,
3299 "Missing or invalid required Wrapped Data attribute");
3300 goto fail;
3301 }
3302 wpa_hexdump(MSG_DEBUG, "DPP: Wrapped data",
3303 wrapped_data, wrapped_data_len);
3304
3305 attr_len = wrapped_data - 4 - attr_start;
3306
3307 addr[0] = hdr;
3308 len[0] = DPP_HDR_LEN;
3309 addr[1] = attr_start;
3310 len[1] = attr_len;
3311 wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
3312 wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
3313 wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
3314 wrapped_data, wrapped_data_len);
3315 unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
3316 unwrapped = os_malloc(unwrapped_len);
3317 if (!unwrapped)
3318 goto fail;
3319 if (aes_siv_decrypt(auth->ke, auth->curve->hash_len,
3320 wrapped_data, wrapped_data_len,
3321 2, addr, len, unwrapped) < 0) {
3322 dpp_auth_fail(auth, "AES-SIV decryption failed");
3323 goto fail;
3324 }
3325 wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
3326 unwrapped, unwrapped_len);
3327
3328 if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
3329 dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
3330 goto fail;
3331 }
3332
3333 e_nonce = dpp_get_attr(unwrapped, unwrapped_len,
3334 DPP_ATTR_ENROLLEE_NONCE,
3335 &e_nonce_len);
3336 if (!e_nonce || e_nonce_len != auth->curve->nonce_len) {
3337 dpp_auth_fail(auth,
3338 "Missing or invalid Enrollee Nonce attribute");
3339 goto fail;
3340 }
3341 wpa_hexdump(MSG_DEBUG, "DPP: Enrollee Nonce", e_nonce, e_nonce_len);
3342 if (os_memcmp(e_nonce, auth->e_nonce, e_nonce_len) != 0) {
3343 dpp_auth_fail(auth, "Enrollee Nonce mismatch");
3344 wpa_hexdump(MSG_DEBUG, "DPP: Expected Enrollee Nonce",
3345 auth->e_nonce, e_nonce_len);
3346 goto fail;
3347 }
3348
3349 status = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_STATUS,
3350 &status_len);
3351 if (!status || status_len < 1) {
3352 dpp_auth_fail(auth,
3353 "Missing or invalid required DPP Status attribute");
3354 goto fail;
3355 }
3356 wpa_printf(MSG_DEBUG, "DPP: Status %u", status[0]);
3357 ret = status[0];
3358
3359 fail:
3360 bin_clear_free(unwrapped, unwrapped_len);
3361 return ret;
3362 }
3363
3364
dpp_build_conf_result(struct dpp_authentication * auth,enum dpp_status_error status)3365 struct wpabuf * dpp_build_conf_result(struct dpp_authentication *auth,
3366 enum dpp_status_error status)
3367 {
3368 struct wpabuf *msg, *clear;
3369 size_t nonce_len, clear_len, attr_len;
3370 const u8 *addr[2];
3371 size_t len[2];
3372 u8 *wrapped;
3373
3374 nonce_len = auth->curve->nonce_len;
3375 clear_len = 5 + 4 + nonce_len;
3376 attr_len = 4 + clear_len + AES_BLOCK_SIZE;
3377 clear = wpabuf_alloc(clear_len);
3378 msg = dpp_alloc_msg(DPP_PA_CONFIGURATION_RESULT, attr_len);
3379 if (!clear || !msg)
3380 goto fail;
3381
3382 /* DPP Status */
3383 dpp_build_attr_status(clear, status);
3384
3385 /* E-nonce */
3386 wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
3387 wpabuf_put_le16(clear, nonce_len);
3388 wpabuf_put_data(clear, auth->e_nonce, nonce_len);
3389
3390 /* OUI, OUI type, Crypto Suite, DPP frame type */
3391 addr[0] = wpabuf_head_u8(msg) + 2;
3392 len[0] = 3 + 1 + 1 + 1;
3393 wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
3394
3395 /* Attributes before Wrapped Data (none) */
3396 addr[1] = wpabuf_put(msg, 0);
3397 len[1] = 0;
3398 wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
3399
3400 /* Wrapped Data */
3401 wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
3402 wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
3403 wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
3404
3405 wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear);
3406 if (aes_siv_encrypt(auth->ke, auth->curve->hash_len,
3407 wpabuf_head(clear), wpabuf_len(clear),
3408 2, addr, len, wrapped) < 0)
3409 goto fail;
3410
3411 wpa_hexdump_buf(MSG_DEBUG, "DPP: Configuration Result attributes", msg);
3412 wpabuf_free(clear);
3413 return msg;
3414 fail:
3415 wpabuf_free(clear);
3416 wpabuf_free(msg);
3417 return NULL;
3418 }
3419
3420
valid_channel_list(const char * val)3421 static int valid_channel_list(const char *val)
3422 {
3423 while (*val) {
3424 if (!((*val >= '0' && *val <= '9') ||
3425 *val == '/' || *val == ','))
3426 return 0;
3427 val++;
3428 }
3429
3430 return 1;
3431 }
3432
3433
dpp_conn_status_result_rx(struct dpp_authentication * auth,const u8 * hdr,const u8 * attr_start,size_t attr_len,u8 * ssid,size_t * ssid_len,char ** channel_list)3434 enum dpp_status_error dpp_conn_status_result_rx(struct dpp_authentication *auth,
3435 const u8 *hdr,
3436 const u8 *attr_start,
3437 size_t attr_len,
3438 u8 *ssid, size_t *ssid_len,
3439 char **channel_list)
3440 {
3441 const u8 *wrapped_data, *status, *e_nonce;
3442 u16 wrapped_data_len, status_len, e_nonce_len;
3443 const u8 *addr[2];
3444 size_t len[2];
3445 u8 *unwrapped = NULL;
3446 size_t unwrapped_len = 0;
3447 enum dpp_status_error ret = 255;
3448 struct json_token *root = NULL, *token;
3449 struct wpabuf *ssid64;
3450
3451 *ssid_len = 0;
3452 *channel_list = NULL;
3453
3454 wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA,
3455 &wrapped_data_len);
3456 if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
3457 dpp_auth_fail(auth,
3458 "Missing or invalid required Wrapped Data attribute");
3459 goto fail;
3460 }
3461 wpa_hexdump(MSG_DEBUG, "DPP: Wrapped data",
3462 wrapped_data, wrapped_data_len);
3463
3464 attr_len = wrapped_data - 4 - attr_start;
3465
3466 addr[0] = hdr;
3467 len[0] = DPP_HDR_LEN;
3468 addr[1] = attr_start;
3469 len[1] = attr_len;
3470 wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
3471 wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
3472 wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
3473 wrapped_data, wrapped_data_len);
3474 unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
3475 unwrapped = os_malloc(unwrapped_len);
3476 if (!unwrapped)
3477 goto fail;
3478 if (aes_siv_decrypt(auth->ke, auth->curve->hash_len,
3479 wrapped_data, wrapped_data_len,
3480 2, addr, len, unwrapped) < 0) {
3481 dpp_auth_fail(auth, "AES-SIV decryption failed");
3482 goto fail;
3483 }
3484 wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
3485 unwrapped, unwrapped_len);
3486
3487 if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
3488 dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
3489 goto fail;
3490 }
3491
3492 e_nonce = dpp_get_attr(unwrapped, unwrapped_len,
3493 DPP_ATTR_ENROLLEE_NONCE,
3494 &e_nonce_len);
3495 if (!e_nonce || e_nonce_len != auth->curve->nonce_len) {
3496 dpp_auth_fail(auth,
3497 "Missing or invalid Enrollee Nonce attribute");
3498 goto fail;
3499 }
3500 wpa_hexdump(MSG_DEBUG, "DPP: Enrollee Nonce", e_nonce, e_nonce_len);
3501 if (os_memcmp(e_nonce, auth->e_nonce, e_nonce_len) != 0) {
3502 dpp_auth_fail(auth, "Enrollee Nonce mismatch");
3503 wpa_hexdump(MSG_DEBUG, "DPP: Expected Enrollee Nonce",
3504 auth->e_nonce, e_nonce_len);
3505 goto fail;
3506 }
3507
3508 status = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_CONN_STATUS,
3509 &status_len);
3510 if (!status) {
3511 dpp_auth_fail(auth,
3512 "Missing required DPP Connection Status attribute");
3513 goto fail;
3514 }
3515 wpa_hexdump_ascii(MSG_DEBUG, "DPP: connStatus JSON",
3516 status, status_len);
3517
3518 root = json_parse((const char *) status, status_len);
3519 if (!root) {
3520 dpp_auth_fail(auth, "Could not parse connStatus");
3521 goto fail;
3522 }
3523
3524 ssid64 = json_get_member_base64url(root, "ssid64");
3525 if (ssid64 && wpabuf_len(ssid64) <= SSID_MAX_LEN) {
3526 *ssid_len = wpabuf_len(ssid64);
3527 os_memcpy(ssid, wpabuf_head(ssid64), *ssid_len);
3528 }
3529 wpabuf_free(ssid64);
3530
3531 token = json_get_member(root, "channelList");
3532 if (token && token->type == JSON_STRING &&
3533 valid_channel_list(token->string))
3534 *channel_list = os_strdup(token->string);
3535
3536 token = json_get_member(root, "result");
3537 if (!token || token->type != JSON_NUMBER) {
3538 dpp_auth_fail(auth, "No connStatus - result");
3539 goto fail;
3540 }
3541 wpa_printf(MSG_DEBUG, "DPP: result %d", token->number);
3542 ret = token->number;
3543
3544 fail:
3545 json_free(root);
3546 bin_clear_free(unwrapped, unwrapped_len);
3547 return ret;
3548 }
3549
3550
dpp_build_conn_status(enum dpp_status_error result,const u8 * ssid,size_t ssid_len,const char * channel_list)3551 struct wpabuf * dpp_build_conn_status(enum dpp_status_error result,
3552 const u8 *ssid, size_t ssid_len,
3553 const char *channel_list)
3554 {
3555 struct wpabuf *json;
3556
3557 json = wpabuf_alloc(1000);
3558 if (!json)
3559 return NULL;
3560 json_start_object(json, NULL);
3561 json_add_int(json, "result", result);
3562 if (ssid) {
3563 json_value_sep(json);
3564 if (json_add_base64url(json, "ssid64", ssid, ssid_len) < 0) {
3565 wpabuf_free(json);
3566 return NULL;
3567 }
3568 }
3569 if (channel_list) {
3570 json_value_sep(json);
3571 json_add_string(json, "channelList", channel_list);
3572 }
3573 json_end_object(json);
3574 wpa_hexdump_ascii(MSG_DEBUG, "DPP: connStatus JSON",
3575 wpabuf_head(json), wpabuf_len(json));
3576
3577 return json;
3578 }
3579
3580
dpp_build_conn_status_result(struct dpp_authentication * auth,enum dpp_status_error result,const u8 * ssid,size_t ssid_len,const char * channel_list)3581 struct wpabuf * dpp_build_conn_status_result(struct dpp_authentication *auth,
3582 enum dpp_status_error result,
3583 const u8 *ssid, size_t ssid_len,
3584 const char *channel_list)
3585 {
3586 struct wpabuf *msg = NULL, *clear = NULL, *json;
3587 size_t nonce_len, clear_len, attr_len;
3588 const u8 *addr[2];
3589 size_t len[2];
3590 u8 *wrapped;
3591
3592 json = dpp_build_conn_status(result, ssid, ssid_len, channel_list);
3593 if (!json)
3594 return NULL;
3595
3596 nonce_len = auth->curve->nonce_len;
3597 clear_len = 5 + 4 + nonce_len + 4 + wpabuf_len(json);
3598 attr_len = 4 + clear_len + AES_BLOCK_SIZE;
3599 clear = wpabuf_alloc(clear_len);
3600 msg = dpp_alloc_msg(DPP_PA_CONNECTION_STATUS_RESULT, attr_len);
3601 if (!clear || !msg)
3602 goto fail;
3603
3604 /* E-nonce */
3605 wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
3606 wpabuf_put_le16(clear, nonce_len);
3607 wpabuf_put_data(clear, auth->e_nonce, nonce_len);
3608
3609 /* DPP Connection Status */
3610 wpabuf_put_le16(clear, DPP_ATTR_CONN_STATUS);
3611 wpabuf_put_le16(clear, wpabuf_len(json));
3612 wpabuf_put_buf(clear, json);
3613
3614 /* OUI, OUI type, Crypto Suite, DPP frame type */
3615 addr[0] = wpabuf_head_u8(msg) + 2;
3616 len[0] = 3 + 1 + 1 + 1;
3617 wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
3618
3619 /* Attributes before Wrapped Data (none) */
3620 addr[1] = wpabuf_put(msg, 0);
3621 len[1] = 0;
3622 wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
3623
3624 /* Wrapped Data */
3625 wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
3626 wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
3627 wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
3628
3629 wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear);
3630 if (aes_siv_encrypt(auth->ke, auth->curve->hash_len,
3631 wpabuf_head(clear), wpabuf_len(clear),
3632 2, addr, len, wrapped) < 0)
3633 goto fail;
3634
3635 wpa_hexdump_buf(MSG_DEBUG, "DPP: Connection Status Result attributes",
3636 msg);
3637 wpabuf_free(json);
3638 wpabuf_free(clear);
3639 return msg;
3640 fail:
3641 wpabuf_free(json);
3642 wpabuf_free(clear);
3643 wpabuf_free(msg);
3644 return NULL;
3645 }
3646
3647 #endif /* CONFIG_DPP2 */
3648
3649
dpp_configurator_free(struct dpp_configurator * conf)3650 void dpp_configurator_free(struct dpp_configurator *conf)
3651 {
3652 if (!conf)
3653 return;
3654 crypto_ec_key_deinit(conf->csign);
3655 os_free(conf->kid);
3656 os_free(conf->connector);
3657 crypto_ec_key_deinit(conf->connector_key);
3658 crypto_ec_key_deinit(conf->pp_key);
3659 os_free(conf);
3660 }
3661
3662
dpp_configurator_get_key(const struct dpp_configurator * conf,char * buf,size_t buflen)3663 int dpp_configurator_get_key(const struct dpp_configurator *conf, char *buf,
3664 size_t buflen)
3665 {
3666 struct wpabuf *key;
3667 int ret = -1;
3668
3669 if (!conf->csign)
3670 return -1;
3671
3672 key = crypto_ec_key_get_ecprivate_key(conf->csign, true);
3673 if (!key)
3674 return -1;
3675
3676 ret = wpa_snprintf_hex(buf, buflen, wpabuf_head(key), wpabuf_len(key));
3677
3678 wpabuf_clear_free(key);
3679 return ret;
3680 }
3681
3682
dpp_configurator_gen_kid(struct dpp_configurator * conf)3683 static int dpp_configurator_gen_kid(struct dpp_configurator *conf)
3684 {
3685 struct wpabuf *csign_pub = NULL;
3686 const u8 *addr[1];
3687 size_t len[1];
3688 int res;
3689
3690 csign_pub = crypto_ec_key_get_pubkey_point(conf->csign, 1);
3691 if (!csign_pub) {
3692 wpa_printf(MSG_INFO, "DPP: Failed to extract C-sign-key");
3693 return -1;
3694 }
3695
3696 /* kid = SHA256(ANSI X9.63 uncompressed C-sign-key) */
3697 addr[0] = wpabuf_head(csign_pub);
3698 len[0] = wpabuf_len(csign_pub);
3699 res = sha256_vector(1, addr, len, conf->kid_hash);
3700 wpabuf_free(csign_pub);
3701 if (res < 0) {
3702 wpa_printf(MSG_DEBUG,
3703 "DPP: Failed to derive kid for C-sign-key");
3704 return -1;
3705 }
3706
3707 conf->kid = base64_url_encode(conf->kid_hash, sizeof(conf->kid_hash),
3708 NULL);
3709 return conf->kid ? 0 : -1;
3710 }
3711
3712
3713 static struct dpp_configurator *
dpp_keygen_configurator(const char * curve,const u8 * privkey,size_t privkey_len,const u8 * pp_key,size_t pp_key_len)3714 dpp_keygen_configurator(const char *curve, const u8 *privkey,
3715 size_t privkey_len, const u8 *pp_key, size_t pp_key_len)
3716 {
3717 struct dpp_configurator *conf;
3718
3719 conf = os_zalloc(sizeof(*conf));
3720 if (!conf)
3721 return NULL;
3722
3723 conf->curve = dpp_get_curve_name(curve);
3724 if (!conf->curve) {
3725 wpa_printf(MSG_INFO, "DPP: Unsupported curve: %s", curve);
3726 os_free(conf);
3727 return NULL;
3728 }
3729
3730 if (privkey)
3731 conf->csign = dpp_set_keypair(&conf->curve, privkey,
3732 privkey_len);
3733 else
3734 conf->csign = dpp_gen_keypair(conf->curve);
3735 if (pp_key)
3736 conf->pp_key = dpp_set_keypair(&conf->curve, pp_key,
3737 pp_key_len);
3738 else
3739 conf->pp_key = dpp_gen_keypair(conf->curve);
3740 if (!conf->csign || !conf->pp_key)
3741 goto fail;
3742 conf->own = 1;
3743
3744 if (dpp_configurator_gen_kid(conf) < 0)
3745 goto fail;
3746 return conf;
3747 fail:
3748 dpp_configurator_free(conf);
3749 return NULL;
3750 }
3751
3752
dpp_configurator_own_config(struct dpp_authentication * auth,const char * curve,int ap)3753 int dpp_configurator_own_config(struct dpp_authentication *auth,
3754 const char *curve, int ap)
3755 {
3756 struct wpabuf *conf_obj;
3757 int ret = -1;
3758
3759 if (!auth->conf) {
3760 wpa_printf(MSG_DEBUG, "DPP: No configurator specified");
3761 return -1;
3762 }
3763
3764 auth->curve = dpp_get_curve_name(curve);
3765 if (!auth->curve) {
3766 wpa_printf(MSG_INFO, "DPP: Unsupported curve: %s", curve);
3767 return -1;
3768 }
3769
3770 wpa_printf(MSG_DEBUG,
3771 "DPP: Building own configuration/connector with curve %s",
3772 auth->curve->name);
3773
3774 auth->own_protocol_key = dpp_gen_keypair(auth->curve);
3775 if (!auth->own_protocol_key)
3776 return -1;
3777 dpp_copy_netaccesskey(auth, &auth->conf_obj[0]);
3778 auth->peer_protocol_key = auth->own_protocol_key;
3779 dpp_copy_csign(&auth->conf_obj[0], auth->conf->csign);
3780
3781 conf_obj = dpp_build_conf_obj(auth, ap, 0, NULL);
3782 if (!conf_obj) {
3783 wpabuf_free(auth->conf_obj[0].c_sign_key);
3784 auth->conf_obj[0].c_sign_key = NULL;
3785 goto fail;
3786 }
3787 ret = dpp_parse_conf_obj(auth, wpabuf_head(conf_obj),
3788 wpabuf_len(conf_obj));
3789 fail:
3790 wpabuf_free(conf_obj);
3791 auth->peer_protocol_key = NULL;
3792 return ret;
3793 }
3794
3795
dpp_compatible_netrole(const char * role1,const char * role2)3796 static int dpp_compatible_netrole(const char *role1, const char *role2)
3797 {
3798 return (os_strcmp(role1, "sta") == 0 && os_strcmp(role2, "ap") == 0) ||
3799 (os_strcmp(role1, "ap") == 0 && os_strcmp(role2, "sta") == 0);
3800 }
3801
3802
dpp_connector_compatible_group(struct json_token * root,const char * group_id,const char * net_role,bool reconfig)3803 static int dpp_connector_compatible_group(struct json_token *root,
3804 const char *group_id,
3805 const char *net_role,
3806 bool reconfig)
3807 {
3808 struct json_token *groups, *token;
3809
3810 groups = json_get_member(root, "groups");
3811 if (!groups || groups->type != JSON_ARRAY)
3812 return 0;
3813
3814 for (token = groups->child; token; token = token->sibling) {
3815 struct json_token *id, *role;
3816
3817 id = json_get_member(token, "groupId");
3818 if (!id || id->type != JSON_STRING)
3819 continue;
3820
3821 role = json_get_member(token, "netRole");
3822 if (!role || role->type != JSON_STRING)
3823 continue;
3824
3825 if (os_strcmp(id->string, "*") != 0 &&
3826 os_strcmp(group_id, "*") != 0 &&
3827 os_strcmp(id->string, group_id) != 0)
3828 continue;
3829
3830 if (reconfig && os_strcmp(net_role, "configurator") == 0)
3831 return 1;
3832 if (!reconfig && dpp_compatible_netrole(role->string, net_role))
3833 return 1;
3834 }
3835
3836 return 0;
3837 }
3838
3839
dpp_connector_match_groups(struct json_token * own_root,struct json_token * peer_root,bool reconfig)3840 int dpp_connector_match_groups(struct json_token *own_root,
3841 struct json_token *peer_root, bool reconfig)
3842 {
3843 struct json_token *groups, *token;
3844
3845 groups = json_get_member(peer_root, "groups");
3846 if (!groups || groups->type != JSON_ARRAY) {
3847 wpa_printf(MSG_DEBUG, "DPP: No peer groups array found");
3848 return 0;
3849 }
3850
3851 for (token = groups->child; token; token = token->sibling) {
3852 struct json_token *id, *role;
3853
3854 id = json_get_member(token, "groupId");
3855 if (!id || id->type != JSON_STRING) {
3856 wpa_printf(MSG_DEBUG,
3857 "DPP: Missing peer groupId string");
3858 continue;
3859 }
3860
3861 role = json_get_member(token, "netRole");
3862 if (!role || role->type != JSON_STRING) {
3863 wpa_printf(MSG_DEBUG,
3864 "DPP: Missing peer groups::netRole string");
3865 continue;
3866 }
3867 wpa_printf(MSG_DEBUG,
3868 "DPP: peer connector group: groupId='%s' netRole='%s'",
3869 id->string, role->string);
3870 if (dpp_connector_compatible_group(own_root, id->string,
3871 role->string, reconfig)) {
3872 wpa_printf(MSG_DEBUG,
3873 "DPP: Compatible group/netRole in own connector");
3874 return 1;
3875 }
3876 }
3877
3878 return 0;
3879 }
3880
3881
dpp_parse_own_connector(const char * own_connector)3882 struct json_token * dpp_parse_own_connector(const char *own_connector)
3883 {
3884 unsigned char *own_conn;
3885 size_t own_conn_len;
3886 const char *pos, *end;
3887 struct json_token *own_root;
3888
3889 pos = os_strchr(own_connector, '.');
3890 if (!pos) {
3891 wpa_printf(MSG_DEBUG, "DPP: Own connector is missing the first dot (.)");
3892 return NULL;
3893 }
3894 pos++;
3895 end = os_strchr(pos, '.');
3896 if (!end) {
3897 wpa_printf(MSG_DEBUG, "DPP: Own connector is missing the second dot (.)");
3898 return NULL;
3899 }
3900 own_conn = base64_url_decode(pos, end - pos, &own_conn_len);
3901 if (!own_conn) {
3902 wpa_printf(MSG_DEBUG,
3903 "DPP: Failed to base64url decode own signedConnector JWS Payload");
3904 return NULL;
3905 }
3906
3907 own_root = json_parse((const char *) own_conn, own_conn_len);
3908 os_free(own_conn);
3909 if (!own_root)
3910 wpa_printf(MSG_DEBUG, "DPP: Failed to parse local connector");
3911
3912 return own_root;
3913 }
3914
3915
3916 enum dpp_status_error
dpp_peer_intro(struct dpp_introduction * intro,const char * own_connector,const u8 * net_access_key,size_t net_access_key_len,const u8 * csign_key,size_t csign_key_len,const u8 * peer_connector,size_t peer_connector_len,os_time_t * expiry)3917 dpp_peer_intro(struct dpp_introduction *intro, const char *own_connector,
3918 const u8 *net_access_key, size_t net_access_key_len,
3919 const u8 *csign_key, size_t csign_key_len,
3920 const u8 *peer_connector, size_t peer_connector_len,
3921 os_time_t *expiry)
3922 {
3923 struct json_token *root = NULL, *netkey, *token;
3924 struct json_token *own_root = NULL;
3925 enum dpp_status_error ret = 255, res;
3926 struct crypto_ec_key *own_key = NULL, *peer_key = NULL;
3927 struct wpabuf *own_key_pub = NULL;
3928 const struct dpp_curve_params *curve, *own_curve;
3929 struct dpp_signed_connector_info info;
3930 size_t Nx_len;
3931 u8 Nx[DPP_MAX_SHARED_SECRET_LEN];
3932
3933 os_memset(intro, 0, sizeof(*intro));
3934 os_memset(&info, 0, sizeof(info));
3935 if (expiry)
3936 *expiry = 0;
3937
3938 own_key = dpp_set_keypair(&own_curve, net_access_key,
3939 net_access_key_len);
3940 if (!own_key) {
3941 wpa_printf(MSG_ERROR, "DPP: Failed to parse own netAccessKey");
3942 goto fail;
3943 }
3944
3945 own_root = dpp_parse_own_connector(own_connector);
3946 if (!own_root)
3947 goto fail;
3948
3949 res = dpp_check_signed_connector(&info, csign_key, csign_key_len,
3950 peer_connector, peer_connector_len);
3951 if (res != DPP_STATUS_OK) {
3952 ret = res;
3953 goto fail;
3954 }
3955
3956 root = json_parse((const char *) info.payload, info.payload_len);
3957 if (!root) {
3958 wpa_printf(MSG_DEBUG, "DPP: JSON parsing of connector failed");
3959 ret = DPP_STATUS_INVALID_CONNECTOR;
3960 goto fail;
3961 }
3962
3963 if (!dpp_connector_match_groups(own_root, root, false)) {
3964 wpa_printf(MSG_DEBUG,
3965 "DPP: Peer connector does not include compatible group netrole with own connector");
3966 ret = DPP_STATUS_NO_MATCH;
3967 goto fail;
3968 }
3969
3970 token = json_get_member(root, "expiry");
3971 if (!token || token->type != JSON_STRING) {
3972 wpa_printf(MSG_DEBUG,
3973 "DPP: No expiry string found - connector does not expire");
3974 } else {
3975 wpa_printf(MSG_DEBUG, "DPP: expiry = %s", token->string);
3976 if (dpp_key_expired(token->string, expiry)) {
3977 wpa_printf(MSG_DEBUG,
3978 "DPP: Connector (netAccessKey) has expired");
3979 ret = DPP_STATUS_INVALID_CONNECTOR;
3980 goto fail;
3981 }
3982 }
3983
3984 #ifdef CONFIG_DPP3
3985 token = json_get_member(root, "version");
3986 if (token && token->type == JSON_NUMBER) {
3987 wpa_printf(MSG_DEBUG, "DPP: version = %d", token->number);
3988 intro->peer_version = token->number;
3989 }
3990 #endif /* CONFIG_DPP3 */
3991
3992 netkey = json_get_member(root, "netAccessKey");
3993 if (!netkey || netkey->type != JSON_OBJECT) {
3994 wpa_printf(MSG_DEBUG, "DPP: No netAccessKey object found");
3995 ret = DPP_STATUS_INVALID_CONNECTOR;
3996 goto fail;
3997 }
3998
3999 peer_key = dpp_parse_jwk(netkey, &curve);
4000 if (!peer_key) {
4001 ret = DPP_STATUS_INVALID_CONNECTOR;
4002 goto fail;
4003 }
4004 dpp_debug_print_key("DPP: Received netAccessKey", peer_key);
4005
4006 if (own_curve != curve) {
4007 wpa_printf(MSG_DEBUG,
4008 "DPP: Mismatching netAccessKey curves (%s != %s)",
4009 own_curve->name, curve->name);
4010 ret = DPP_STATUS_INVALID_CONNECTOR;
4011 goto fail;
4012 }
4013
4014 /* ECDH: N = nk * PK */
4015 if (dpp_ecdh(own_key, peer_key, Nx, &Nx_len) < 0)
4016 goto fail;
4017
4018 wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (N.x)",
4019 Nx, Nx_len);
4020
4021 /* PMK = HKDF(<>, "DPP PMK", N.x) */
4022 if (dpp_derive_pmk(Nx, Nx_len, intro->pmk, curve->hash_len) < 0) {
4023 wpa_printf(MSG_ERROR, "DPP: Failed to derive PMK");
4024 goto fail;
4025 }
4026 intro->pmk_len = curve->hash_len;
4027
4028 /* PMKID = Truncate-128(H(min(NK.x, PK.x) | max(NK.x, PK.x))) */
4029 if (dpp_derive_pmkid(curve, own_key, peer_key, intro->pmkid) < 0) {
4030 wpa_printf(MSG_ERROR, "DPP: Failed to derive PMKID");
4031 goto fail;
4032 }
4033
4034 ret = DPP_STATUS_OK;
4035 fail:
4036 if (ret != DPP_STATUS_OK)
4037 os_memset(intro, 0, sizeof(*intro));
4038 os_memset(Nx, 0, sizeof(Nx));
4039 os_free(info.payload);
4040 crypto_ec_key_deinit(own_key);
4041 wpabuf_free(own_key_pub);
4042 crypto_ec_key_deinit(peer_key);
4043 json_free(root);
4044 json_free(own_root);
4045 return ret;
4046 }
4047
4048
4049 #ifdef CONFIG_DPP3
dpp_get_connector_version(const char * connector)4050 int dpp_get_connector_version(const char *connector)
4051 {
4052 struct json_token *root, *token;
4053 int ver = -1;
4054
4055 root = dpp_parse_own_connector(connector);
4056 if (!root)
4057 return -1;
4058
4059 token = json_get_member(root, "version");
4060 if (token && token->type == JSON_NUMBER)
4061 ver = token->number;
4062
4063 json_free(root);
4064 return ver;
4065 }
4066 #endif /* CONFIG_DPP3 */
4067
4068
dpp_next_id(struct dpp_global * dpp)4069 unsigned int dpp_next_id(struct dpp_global *dpp)
4070 {
4071 struct dpp_bootstrap_info *bi;
4072 unsigned int max_id = 0;
4073
4074 dl_list_for_each(bi, &dpp->bootstrap, struct dpp_bootstrap_info, list) {
4075 if (bi->id > max_id)
4076 max_id = bi->id;
4077 }
4078 return max_id + 1;
4079 }
4080
4081
dpp_bootstrap_del(struct dpp_global * dpp,unsigned int id)4082 static int dpp_bootstrap_del(struct dpp_global *dpp, unsigned int id)
4083 {
4084 struct dpp_bootstrap_info *bi, *tmp;
4085 int found = 0;
4086
4087 if (!dpp)
4088 return -1;
4089
4090 dl_list_for_each_safe(bi, tmp, &dpp->bootstrap,
4091 struct dpp_bootstrap_info, list) {
4092 if (id && bi->id != id)
4093 continue;
4094 found = 1;
4095 #ifdef CONFIG_DPP2
4096 if (dpp->remove_bi)
4097 dpp->remove_bi(dpp->cb_ctx, bi);
4098 #endif /* CONFIG_DPP2 */
4099 dl_list_del(&bi->list);
4100 dpp_bootstrap_info_free(bi);
4101 }
4102
4103 if (id == 0)
4104 return 0; /* flush succeeds regardless of entries found */
4105 return found ? 0 : -1;
4106 }
4107
4108
dpp_add_qr_code(struct dpp_global * dpp,const char * uri)4109 struct dpp_bootstrap_info * dpp_add_qr_code(struct dpp_global *dpp,
4110 const char *uri)
4111 {
4112 struct dpp_bootstrap_info *bi;
4113
4114 if (!dpp)
4115 return NULL;
4116
4117 bi = dpp_parse_uri(uri);
4118 if (!bi)
4119 return NULL;
4120
4121 bi->type = DPP_BOOTSTRAP_QR_CODE;
4122 bi->id = dpp_next_id(dpp);
4123 dl_list_add(&dpp->bootstrap, &bi->list);
4124 return bi;
4125 }
4126
4127
dpp_add_nfc_uri(struct dpp_global * dpp,const char * uri)4128 struct dpp_bootstrap_info * dpp_add_nfc_uri(struct dpp_global *dpp,
4129 const char *uri)
4130 {
4131 struct dpp_bootstrap_info *bi;
4132
4133 if (!dpp)
4134 return NULL;
4135
4136 bi = dpp_parse_uri(uri);
4137 if (!bi)
4138 return NULL;
4139
4140 bi->type = DPP_BOOTSTRAP_NFC_URI;
4141 bi->id = dpp_next_id(dpp);
4142 dl_list_add(&dpp->bootstrap, &bi->list);
4143 return bi;
4144 }
4145
4146
dpp_bootstrap_gen(struct dpp_global * dpp,const char * cmd)4147 int dpp_bootstrap_gen(struct dpp_global *dpp, const char *cmd)
4148 {
4149 char *mac = NULL, *info = NULL, *curve = NULL;
4150 char *key = NULL;
4151 u8 *privkey = NULL;
4152 size_t privkey_len = 0;
4153 int ret = -1;
4154 struct dpp_bootstrap_info *bi;
4155
4156 if (!dpp)
4157 return -1;
4158
4159 bi = os_zalloc(sizeof(*bi));
4160 if (!bi)
4161 goto fail;
4162
4163 if (os_strstr(cmd, "type=qrcode"))
4164 bi->type = DPP_BOOTSTRAP_QR_CODE;
4165 else if (os_strstr(cmd, "type=pkex"))
4166 bi->type = DPP_BOOTSTRAP_PKEX;
4167 else if (os_strstr(cmd, "type=nfc-uri"))
4168 bi->type = DPP_BOOTSTRAP_NFC_URI;
4169 else
4170 goto fail;
4171
4172 bi->chan = get_param(cmd, " chan=");
4173 mac = get_param(cmd, " mac=");
4174 info = get_param(cmd, " info=");
4175 curve = get_param(cmd, " curve=");
4176 key = get_param(cmd, " key=");
4177
4178 if (key) {
4179 privkey_len = os_strlen(key) / 2;
4180 privkey = os_malloc(privkey_len);
4181 if (!privkey ||
4182 hexstr2bin(key, privkey, privkey_len) < 0)
4183 goto fail;
4184 }
4185
4186 if (dpp_keygen(bi, curve, privkey, privkey_len) < 0 ||
4187 dpp_parse_uri_chan_list(bi, bi->chan) < 0 ||
4188 dpp_parse_uri_mac(bi, mac) < 0 ||
4189 dpp_parse_uri_info(bi, info) < 0 ||
4190 dpp_gen_uri(bi) < 0)
4191 goto fail;
4192
4193 bi->id = dpp_next_id(dpp);
4194 dl_list_add(&dpp->bootstrap, &bi->list);
4195 ret = bi->id;
4196 bi = NULL;
4197 fail:
4198 os_free(curve);
4199 os_free(mac);
4200 os_free(info);
4201 str_clear_free(key);
4202 bin_clear_free(privkey, privkey_len);
4203 dpp_bootstrap_info_free(bi);
4204 return ret;
4205 }
4206
4207
4208 struct dpp_bootstrap_info *
dpp_bootstrap_get_id(struct dpp_global * dpp,unsigned int id)4209 dpp_bootstrap_get_id(struct dpp_global *dpp, unsigned int id)
4210 {
4211 struct dpp_bootstrap_info *bi;
4212
4213 if (!dpp)
4214 return NULL;
4215
4216 dl_list_for_each(bi, &dpp->bootstrap, struct dpp_bootstrap_info, list) {
4217 if (bi->id == id)
4218 return bi;
4219 }
4220 return NULL;
4221 }
4222
4223
dpp_bootstrap_remove(struct dpp_global * dpp,const char * id)4224 int dpp_bootstrap_remove(struct dpp_global *dpp, const char *id)
4225 {
4226 unsigned int id_val;
4227
4228 if (os_strcmp(id, "*") == 0) {
4229 id_val = 0;
4230 } else {
4231 id_val = atoi(id);
4232 if (id_val == 0)
4233 return -1;
4234 }
4235
4236 return dpp_bootstrap_del(dpp, id_val);
4237 }
4238
4239
dpp_bootstrap_get_uri(struct dpp_global * dpp,unsigned int id)4240 const char * dpp_bootstrap_get_uri(struct dpp_global *dpp, unsigned int id)
4241 {
4242 struct dpp_bootstrap_info *bi;
4243
4244 bi = dpp_bootstrap_get_id(dpp, id);
4245 if (!bi)
4246 return NULL;
4247 return bi->uri;
4248 }
4249
4250
dpp_bootstrap_info(struct dpp_global * dpp,int id,char * reply,int reply_size)4251 int dpp_bootstrap_info(struct dpp_global *dpp, int id,
4252 char *reply, int reply_size)
4253 {
4254 struct dpp_bootstrap_info *bi;
4255 char pkhash[2 * SHA256_MAC_LEN + 1];
4256
4257 bi = dpp_bootstrap_get_id(dpp, id);
4258 if (!bi)
4259 return -1;
4260 wpa_snprintf_hex(pkhash, sizeof(pkhash), bi->pubkey_hash,
4261 SHA256_MAC_LEN);
4262 return os_snprintf(reply, reply_size, "type=%s\n"
4263 "mac_addr=" MACSTR "\n"
4264 "info=%s\n"
4265 "num_freq=%u\n"
4266 "use_freq=%u\n"
4267 "curve=%s\n"
4268 "pkhash=%s\n"
4269 "version=%d\n",
4270 dpp_bootstrap_type_txt(bi->type),
4271 MAC2STR(bi->mac_addr),
4272 bi->info ? bi->info : "",
4273 bi->num_freq,
4274 bi->num_freq == 1 ? bi->freq[0] : 0,
4275 bi->curve->name,
4276 pkhash,
4277 bi->version);
4278 }
4279
4280
dpp_bootstrap_set(struct dpp_global * dpp,int id,const char * params)4281 int dpp_bootstrap_set(struct dpp_global *dpp, int id, const char *params)
4282 {
4283 struct dpp_bootstrap_info *bi;
4284
4285 bi = dpp_bootstrap_get_id(dpp, id);
4286 if (!bi)
4287 return -1;
4288
4289 str_clear_free(bi->configurator_params);
4290
4291 if (params) {
4292 bi->configurator_params = os_strdup(params);
4293 return bi->configurator_params ? 0 : -1;
4294 }
4295
4296 bi->configurator_params = NULL;
4297 return 0;
4298 }
4299
4300
dpp_bootstrap_find_pair(struct dpp_global * dpp,const u8 * i_bootstrap,const u8 * r_bootstrap,struct dpp_bootstrap_info ** own_bi,struct dpp_bootstrap_info ** peer_bi)4301 void dpp_bootstrap_find_pair(struct dpp_global *dpp, const u8 *i_bootstrap,
4302 const u8 *r_bootstrap,
4303 struct dpp_bootstrap_info **own_bi,
4304 struct dpp_bootstrap_info **peer_bi)
4305 {
4306 struct dpp_bootstrap_info *bi;
4307
4308 *own_bi = NULL;
4309 *peer_bi = NULL;
4310 if (!dpp)
4311 return;
4312
4313 dl_list_for_each(bi, &dpp->bootstrap, struct dpp_bootstrap_info, list) {
4314 if (!*own_bi && bi->own &&
4315 os_memcmp(bi->pubkey_hash, r_bootstrap,
4316 SHA256_MAC_LEN) == 0) {
4317 wpa_printf(MSG_DEBUG,
4318 "DPP: Found matching own bootstrapping information");
4319 *own_bi = bi;
4320 }
4321
4322 if (!*peer_bi && !bi->own &&
4323 os_memcmp(bi->pubkey_hash, i_bootstrap,
4324 SHA256_MAC_LEN) == 0) {
4325 wpa_printf(MSG_DEBUG,
4326 "DPP: Found matching peer bootstrapping information");
4327 *peer_bi = bi;
4328 }
4329
4330 if (*own_bi && *peer_bi)
4331 break;
4332 }
4333 }
4334
4335
4336 #ifdef CONFIG_DPP2
dpp_bootstrap_find_chirp(struct dpp_global * dpp,const u8 * hash)4337 struct dpp_bootstrap_info * dpp_bootstrap_find_chirp(struct dpp_global *dpp,
4338 const u8 *hash)
4339 {
4340 struct dpp_bootstrap_info *bi;
4341
4342 if (!dpp)
4343 return NULL;
4344
4345 dl_list_for_each(bi, &dpp->bootstrap, struct dpp_bootstrap_info, list) {
4346 if (!bi->own && os_memcmp(bi->pubkey_hash_chirp, hash,
4347 SHA256_MAC_LEN) == 0)
4348 return bi;
4349 }
4350
4351 return NULL;
4352 }
4353 #endif /* CONFIG_DPP2 */
4354
4355
dpp_nfc_update_bi_channel(struct dpp_bootstrap_info * own_bi,struct dpp_bootstrap_info * peer_bi)4356 static int dpp_nfc_update_bi_channel(struct dpp_bootstrap_info *own_bi,
4357 struct dpp_bootstrap_info *peer_bi)
4358 {
4359 unsigned int i, freq = 0;
4360 enum hostapd_hw_mode mode;
4361 u8 op_class, channel;
4362 char chan[20];
4363
4364 if (peer_bi->num_freq == 0 && !peer_bi->channels_listed)
4365 return 0; /* no channel preference/constraint */
4366
4367 for (i = 0; i < peer_bi->num_freq; i++) {
4368 if ((own_bi->num_freq == 0 && !own_bi->channels_listed) ||
4369 freq_included(own_bi->freq, own_bi->num_freq,
4370 peer_bi->freq[i])) {
4371 freq = peer_bi->freq[i];
4372 break;
4373 }
4374 }
4375 if (!freq) {
4376 wpa_printf(MSG_DEBUG, "DPP: No common channel found");
4377 return -1;
4378 }
4379
4380 mode = ieee80211_freq_to_channel_ext(freq, 0, 0, &op_class, &channel);
4381 if (mode == NUM_HOSTAPD_MODES) {
4382 wpa_printf(MSG_DEBUG,
4383 "DPP: Could not determine operating class or channel number for %u MHz",
4384 freq);
4385 }
4386
4387 wpa_printf(MSG_DEBUG,
4388 "DPP: Selected %u MHz (op_class %u channel %u) as the negotiation channel based on information from NFC negotiated handover",
4389 freq, op_class, channel);
4390 os_snprintf(chan, sizeof(chan), "%u/%u", op_class, channel);
4391 os_free(own_bi->chan);
4392 own_bi->chan = os_strdup(chan);
4393 own_bi->freq[0] = freq;
4394 own_bi->num_freq = 1;
4395 os_free(peer_bi->chan);
4396 peer_bi->chan = os_strdup(chan);
4397 peer_bi->freq[0] = freq;
4398 peer_bi->num_freq = 1;
4399
4400 return dpp_gen_uri(own_bi);
4401 }
4402
4403
dpp_nfc_update_bi_key(struct dpp_bootstrap_info * own_bi,struct dpp_bootstrap_info * peer_bi)4404 static int dpp_nfc_update_bi_key(struct dpp_bootstrap_info *own_bi,
4405 struct dpp_bootstrap_info *peer_bi)
4406 {
4407 if (peer_bi->curve == own_bi->curve)
4408 return 0;
4409
4410 wpa_printf(MSG_DEBUG,
4411 "DPP: Update own bootstrapping key to match peer curve from NFC handover");
4412
4413 crypto_ec_key_deinit(own_bi->pubkey);
4414 own_bi->pubkey = NULL;
4415
4416 if (dpp_keygen(own_bi, peer_bi->curve->name, NULL, 0) < 0 ||
4417 dpp_gen_uri(own_bi) < 0)
4418 goto fail;
4419
4420 return 0;
4421 fail:
4422 dl_list_del(&own_bi->list);
4423 dpp_bootstrap_info_free(own_bi);
4424 return -1;
4425 }
4426
4427
dpp_nfc_update_bi(struct dpp_bootstrap_info * own_bi,struct dpp_bootstrap_info * peer_bi)4428 int dpp_nfc_update_bi(struct dpp_bootstrap_info *own_bi,
4429 struct dpp_bootstrap_info *peer_bi)
4430 {
4431 if (dpp_nfc_update_bi_channel(own_bi, peer_bi) < 0 ||
4432 dpp_nfc_update_bi_key(own_bi, peer_bi) < 0)
4433 return -1;
4434 return 0;
4435 }
4436
4437
dpp_next_configurator_id(struct dpp_global * dpp)4438 static unsigned int dpp_next_configurator_id(struct dpp_global *dpp)
4439 {
4440 struct dpp_configurator *conf;
4441 unsigned int max_id = 0;
4442
4443 dl_list_for_each(conf, &dpp->configurator, struct dpp_configurator,
4444 list) {
4445 if (conf->id > max_id)
4446 max_id = conf->id;
4447 }
4448 return max_id + 1;
4449 }
4450
4451
dpp_configurator_add(struct dpp_global * dpp,const char * cmd)4452 int dpp_configurator_add(struct dpp_global *dpp, const char *cmd)
4453 {
4454 char *curve;
4455 char *key = NULL, *ppkey = NULL;
4456 u8 *privkey = NULL, *pp_key = NULL;
4457 size_t privkey_len = 0, pp_key_len = 0;
4458 int ret = -1;
4459 struct dpp_configurator *conf = NULL;
4460 const struct dpp_curve_params *net_access_key_curve = NULL;
4461
4462 curve = get_param(cmd, " net_access_key_curve=");
4463 if (curve) {
4464 net_access_key_curve = dpp_get_curve_name(curve);
4465 if (!net_access_key_curve) {
4466 wpa_printf(MSG_DEBUG,
4467 "DPP: Unsupported net_access_key_curve: %s",
4468 curve);
4469 goto fail;
4470 }
4471 os_free(curve);
4472 }
4473
4474 curve = get_param(cmd, " curve=");
4475 key = get_param(cmd, " key=");
4476 ppkey = get_param(cmd, " ppkey=");
4477
4478 if (key) {
4479 privkey_len = os_strlen(key) / 2;
4480 privkey = os_malloc(privkey_len);
4481 if (!privkey ||
4482 hexstr2bin(key, privkey, privkey_len) < 0)
4483 goto fail;
4484 }
4485
4486 if (ppkey) {
4487 pp_key_len = os_strlen(ppkey) / 2;
4488 pp_key = os_malloc(pp_key_len);
4489 if (!pp_key ||
4490 hexstr2bin(ppkey, pp_key, pp_key_len) < 0)
4491 goto fail;
4492 }
4493
4494 conf = dpp_keygen_configurator(curve, privkey, privkey_len,
4495 pp_key, pp_key_len);
4496 if (!conf)
4497 goto fail;
4498
4499 conf->net_access_key_curve = net_access_key_curve;
4500 conf->id = dpp_next_configurator_id(dpp);
4501 dl_list_add(&dpp->configurator, &conf->list);
4502 ret = conf->id;
4503 conf = NULL;
4504 fail:
4505 os_free(curve);
4506 str_clear_free(key);
4507 str_clear_free(ppkey);
4508 bin_clear_free(privkey, privkey_len);
4509 bin_clear_free(pp_key, pp_key_len);
4510 dpp_configurator_free(conf);
4511 return ret;
4512 }
4513
4514
dpp_configurator_set(struct dpp_global * dpp,const char * cmd)4515 int dpp_configurator_set(struct dpp_global *dpp, const char *cmd)
4516 {
4517 unsigned int id;
4518 struct dpp_configurator *conf;
4519 char *curve;
4520
4521 id = atoi(cmd);
4522 conf = dpp_configurator_get_id(dpp, id);
4523 if (!conf)
4524 return -1;
4525
4526 curve = get_param(cmd, " net_access_key_curve=");
4527 if (curve) {
4528 const struct dpp_curve_params *net_access_key_curve;
4529
4530 net_access_key_curve = dpp_get_curve_name(curve);
4531 os_free(curve);
4532 if (!net_access_key_curve)
4533 return -1;
4534 conf->net_access_key_curve = net_access_key_curve;
4535 }
4536
4537 return 0;
4538 }
4539
4540
dpp_configurator_del(struct dpp_global * dpp,unsigned int id)4541 static int dpp_configurator_del(struct dpp_global *dpp, unsigned int id)
4542 {
4543 struct dpp_configurator *conf, *tmp;
4544 int found = 0;
4545
4546 if (!dpp)
4547 return -1;
4548
4549 dl_list_for_each_safe(conf, tmp, &dpp->configurator,
4550 struct dpp_configurator, list) {
4551 if (id && conf->id != id)
4552 continue;
4553 found = 1;
4554 dl_list_del(&conf->list);
4555 dpp_configurator_free(conf);
4556 }
4557
4558 if (id == 0)
4559 return 0; /* flush succeeds regardless of entries found */
4560 return found ? 0 : -1;
4561 }
4562
4563
dpp_configurator_remove(struct dpp_global * dpp,const char * id)4564 int dpp_configurator_remove(struct dpp_global *dpp, const char *id)
4565 {
4566 unsigned int id_val;
4567
4568 if (os_strcmp(id, "*") == 0) {
4569 id_val = 0;
4570 } else {
4571 id_val = atoi(id);
4572 if (id_val == 0)
4573 return -1;
4574 }
4575
4576 return dpp_configurator_del(dpp, id_val);
4577 }
4578
4579
dpp_configurator_get_key_id(struct dpp_global * dpp,unsigned int id,char * buf,size_t buflen)4580 int dpp_configurator_get_key_id(struct dpp_global *dpp, unsigned int id,
4581 char *buf, size_t buflen)
4582 {
4583 struct dpp_configurator *conf;
4584
4585 conf = dpp_configurator_get_id(dpp, id);
4586 if (!conf)
4587 return -1;
4588
4589 return dpp_configurator_get_key(conf, buf, buflen);
4590 }
4591
4592
4593 #ifdef CONFIG_DPP2
4594
dpp_configurator_from_backup(struct dpp_global * dpp,struct dpp_asymmetric_key * key)4595 int dpp_configurator_from_backup(struct dpp_global *dpp,
4596 struct dpp_asymmetric_key *key)
4597 {
4598 struct dpp_configurator *conf;
4599 const struct dpp_curve_params *curve, *curve_pp;
4600
4601 if (!key->csign || !key->pp_key)
4602 return -1;
4603
4604 curve = dpp_get_curve_ike_group(crypto_ec_key_group(key->csign));
4605 if (!curve) {
4606 wpa_printf(MSG_INFO, "DPP: Unsupported group in c-sign-key");
4607 return -1;
4608 }
4609
4610 curve_pp = dpp_get_curve_ike_group(crypto_ec_key_group(key->pp_key));
4611 if (!curve_pp) {
4612 wpa_printf(MSG_INFO, "DPP: Unsupported group in ppKey");
4613 return -1;
4614 }
4615
4616 if (curve != curve_pp) {
4617 wpa_printf(MSG_INFO,
4618 "DPP: Mismatch in c-sign-key and ppKey groups");
4619 return -1;
4620 }
4621
4622 conf = os_zalloc(sizeof(*conf));
4623 if (!conf)
4624 return -1;
4625 conf->curve = curve;
4626 conf->csign = key->csign;
4627 key->csign = NULL;
4628 conf->pp_key = key->pp_key;
4629 key->pp_key = NULL;
4630 conf->own = 1;
4631 if (dpp_configurator_gen_kid(conf) < 0) {
4632 dpp_configurator_free(conf);
4633 return -1;
4634 }
4635
4636 conf->id = dpp_next_configurator_id(dpp);
4637 dl_list_add(&dpp->configurator, &conf->list);
4638 return conf->id;
4639 }
4640
4641
dpp_configurator_find_kid(struct dpp_global * dpp,const u8 * kid)4642 struct dpp_configurator * dpp_configurator_find_kid(struct dpp_global *dpp,
4643 const u8 *kid)
4644 {
4645 struct dpp_configurator *conf;
4646
4647 if (!dpp)
4648 return NULL;
4649
4650 dl_list_for_each(conf, &dpp->configurator,
4651 struct dpp_configurator, list) {
4652 if (os_memcmp(conf->kid_hash, kid, SHA256_MAC_LEN) == 0)
4653 return conf;
4654 }
4655 return NULL;
4656 }
4657
4658 #endif /* CONFIG_DPP2 */
4659
4660
dpp_global_init(struct dpp_global_config * config)4661 struct dpp_global * dpp_global_init(struct dpp_global_config *config)
4662 {
4663 struct dpp_global *dpp;
4664
4665 dpp = os_zalloc(sizeof(*dpp));
4666 if (!dpp)
4667 return NULL;
4668 #ifdef CONFIG_DPP2
4669 dpp->cb_ctx = config->cb_ctx;
4670 dpp->remove_bi = config->remove_bi;
4671 #endif /* CONFIG_DPP2 */
4672
4673 dl_list_init(&dpp->bootstrap);
4674 dl_list_init(&dpp->configurator);
4675 #ifdef CONFIG_DPP2
4676 dl_list_init(&dpp->controllers);
4677 dl_list_init(&dpp->tcp_init);
4678 #endif /* CONFIG_DPP2 */
4679
4680 return dpp;
4681 }
4682
4683
dpp_global_clear(struct dpp_global * dpp)4684 void dpp_global_clear(struct dpp_global *dpp)
4685 {
4686 if (!dpp)
4687 return;
4688
4689 dpp_bootstrap_del(dpp, 0);
4690 dpp_configurator_del(dpp, 0);
4691 #ifdef CONFIG_DPP2
4692 dpp_tcp_init_flush(dpp);
4693 dpp_relay_flush_controllers(dpp);
4694 dpp_controller_stop(dpp);
4695 #endif /* CONFIG_DPP2 */
4696 }
4697
4698
dpp_global_deinit(struct dpp_global * dpp)4699 void dpp_global_deinit(struct dpp_global *dpp)
4700 {
4701 dpp_global_clear(dpp);
4702 os_free(dpp);
4703 }
4704
4705
4706 #ifdef CONFIG_DPP2
4707
dpp_build_presence_announcement(struct dpp_bootstrap_info * bi)4708 struct wpabuf * dpp_build_presence_announcement(struct dpp_bootstrap_info *bi)
4709 {
4710 struct wpabuf *msg;
4711
4712 wpa_printf(MSG_DEBUG, "DPP: Build Presence Announcement frame");
4713
4714 msg = dpp_alloc_msg(DPP_PA_PRESENCE_ANNOUNCEMENT, 4 + SHA256_MAC_LEN);
4715 if (!msg)
4716 return NULL;
4717
4718 /* Responder Bootstrapping Key Hash */
4719 dpp_build_attr_r_bootstrap_key_hash(msg, bi->pubkey_hash_chirp);
4720 wpa_hexdump_buf(MSG_DEBUG,
4721 "DPP: Presence Announcement frame attributes", msg);
4722 return msg;
4723 }
4724
4725
dpp_notify_chirp_received(void * msg_ctx,int id,const u8 * src,unsigned int freq,const u8 * hash)4726 void dpp_notify_chirp_received(void *msg_ctx, int id, const u8 *src,
4727 unsigned int freq, const u8 *hash)
4728 {
4729 char hex[SHA256_MAC_LEN * 2 + 1];
4730
4731 wpa_snprintf_hex(hex, sizeof(hex), hash, SHA256_MAC_LEN);
4732 wpa_msg(msg_ctx, MSG_INFO,
4733 DPP_EVENT_CHIRP_RX "id=%d src=" MACSTR " freq=%u hash=%s",
4734 id, MAC2STR(src), freq, hex);
4735 }
4736
4737 #endif /* CONFIG_DPP2 */
4738
