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be27e185 JM |
1 | /* |
2 | * DPP functionality shared between hostapd and wpa_supplicant | |
3 | * Copyright (c) 2017, Qualcomm Atheros, Inc. | |
4 | * | |
5 | * This software may be distributed under the terms of the BSD license. | |
6 | * See README for more details. | |
7 | */ | |
8 | ||
9 | #include "utils/includes.h" | |
461d39af | 10 | #include <openssl/opensslv.h> |
be27e185 JM |
11 | #include <openssl/err.h> |
12 | ||
13 | #include "utils/common.h" | |
14 | #include "utils/base64.h" | |
461d39af | 15 | #include "utils/json.h" |
be27e185 | 16 | #include "common/ieee802_11_common.h" |
30d27b04 JM |
17 | #include "common/ieee802_11_defs.h" |
18 | #include "common/wpa_ctrl.h" | |
be27e185 | 19 | #include "crypto/crypto.h" |
30d27b04 JM |
20 | #include "crypto/random.h" |
21 | #include "crypto/aes.h" | |
22 | #include "crypto/aes_siv.h" | |
23 | #include "crypto/sha384.h" | |
24 | #include "crypto/sha512.h" | |
be27e185 JM |
25 | #include "dpp.h" |
26 | ||
27 | ||
461d39af JM |
28 | #if OPENSSL_VERSION_NUMBER < 0x10100000L |
29 | /* Compatibility wrappers for older versions. */ | |
30 | ||
31 | static int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s) | |
32 | { | |
33 | sig->r = r; | |
34 | sig->s = s; | |
35 | return 1; | |
36 | } | |
37 | ||
38 | ||
39 | static void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, | |
40 | const BIGNUM **ps) | |
41 | { | |
42 | if (pr) | |
43 | *pr = sig->r; | |
44 | if (ps) | |
45 | *ps = sig->s; | |
46 | } | |
47 | ||
48 | #endif | |
49 | ||
50 | ||
be27e185 JM |
51 | static const struct dpp_curve_params dpp_curves[] = { |
52 | /* The mandatory to support and the default NIST P-256 curve needs to | |
53 | * be the first entry on this list. */ | |
54 | { "prime256v1", 32, 32, 16, 32, "P-256" }, | |
55 | { "secp384r1", 48, 48, 24, 48, "P-384" }, | |
56 | { "secp521r1", 64, 64, 32, 66, "P-521" }, | |
57 | { "brainpoolP256r1", 32, 32, 16, 32, "BP-256R1" }, | |
58 | { "brainpoolP384r1", 48, 48, 24, 48, "BP-384R1" }, | |
59 | { "brainpoolP512r1", 64, 64, 32, 64, "BP-512R1" }, | |
60 | { NULL, 0, 0, 0, 0, NULL } | |
61 | }; | |
62 | ||
63 | ||
30d27b04 JM |
64 | static struct wpabuf * dpp_get_pubkey_point(EVP_PKEY *pkey, int prefix) |
65 | { | |
66 | int len, res; | |
67 | EC_KEY *eckey; | |
68 | struct wpabuf *buf; | |
69 | unsigned char *pos; | |
70 | ||
71 | eckey = EVP_PKEY_get1_EC_KEY(pkey); | |
72 | if (!eckey) | |
73 | return NULL; | |
74 | EC_KEY_set_conv_form(eckey, POINT_CONVERSION_UNCOMPRESSED); | |
75 | len = i2o_ECPublicKey(eckey, NULL); | |
76 | if (len <= 0) { | |
77 | wpa_printf(MSG_ERROR, | |
78 | "DDP: Failed to determine public key encoding length"); | |
79 | EC_KEY_free(eckey); | |
80 | return NULL; | |
81 | } | |
82 | ||
83 | buf = wpabuf_alloc(len); | |
84 | if (!buf) { | |
85 | EC_KEY_free(eckey); | |
86 | return NULL; | |
87 | } | |
88 | ||
89 | pos = wpabuf_put(buf, len); | |
90 | res = i2o_ECPublicKey(eckey, &pos); | |
91 | EC_KEY_free(eckey); | |
92 | if (res != len) { | |
93 | wpa_printf(MSG_ERROR, | |
94 | "DDP: Failed to encode public key (res=%d/%d)", | |
95 | res, len); | |
96 | wpabuf_free(buf); | |
97 | return NULL; | |
98 | } | |
99 | ||
100 | if (!prefix) { | |
101 | /* Remove 0x04 prefix to match DPP definition */ | |
102 | pos = wpabuf_mhead(buf); | |
103 | os_memmove(pos, pos + 1, len - 1); | |
104 | buf->used--; | |
105 | } | |
106 | ||
107 | return buf; | |
108 | } | |
109 | ||
110 | ||
111 | static EVP_PKEY * dpp_set_pubkey_point_group(const EC_GROUP *group, | |
112 | const u8 *buf_x, const u8 *buf_y, | |
113 | size_t len) | |
114 | { | |
115 | EC_KEY *eckey = NULL; | |
116 | BN_CTX *ctx; | |
117 | EC_POINT *point = NULL; | |
118 | BIGNUM *x = NULL, *y = NULL; | |
119 | EVP_PKEY *pkey = NULL; | |
120 | ||
121 | ctx = BN_CTX_new(); | |
122 | if (!ctx) { | |
123 | wpa_printf(MSG_ERROR, "DPP: Out of memory"); | |
124 | return NULL; | |
125 | } | |
126 | ||
127 | point = EC_POINT_new(group); | |
128 | x = BN_bin2bn(buf_x, len, NULL); | |
129 | y = BN_bin2bn(buf_y, len, NULL); | |
130 | if (!point || !x || !y) { | |
131 | wpa_printf(MSG_ERROR, "DPP: Out of memory"); | |
132 | goto fail; | |
133 | } | |
134 | ||
135 | if (!EC_POINT_set_affine_coordinates_GFp(group, point, x, y, ctx)) { | |
136 | wpa_printf(MSG_ERROR, | |
137 | "DPP: OpenSSL: EC_POINT_set_affine_coordinates_GFp failed: %s", | |
138 | ERR_error_string(ERR_get_error(), NULL)); | |
139 | goto fail; | |
140 | } | |
141 | ||
142 | if (!EC_POINT_is_on_curve(group, point, ctx) || | |
143 | EC_POINT_is_at_infinity(group, point)) { | |
144 | wpa_printf(MSG_ERROR, "DPP: Invalid point"); | |
145 | goto fail; | |
146 | } | |
147 | ||
148 | eckey = EC_KEY_new(); | |
149 | if (!eckey || | |
150 | EC_KEY_set_group(eckey, group) != 1 || | |
151 | EC_KEY_set_public_key(eckey, point) != 1) { | |
152 | wpa_printf(MSG_ERROR, | |
153 | "DPP: Failed to set EC_KEY: %s", | |
154 | ERR_error_string(ERR_get_error(), NULL)); | |
155 | goto fail; | |
156 | } | |
157 | EC_KEY_set_asn1_flag(eckey, OPENSSL_EC_NAMED_CURVE); | |
158 | ||
159 | pkey = EVP_PKEY_new(); | |
160 | if (!pkey || EVP_PKEY_set1_EC_KEY(pkey, eckey) != 1) { | |
161 | wpa_printf(MSG_ERROR, "DPP: Could not create EVP_PKEY"); | |
162 | goto fail; | |
163 | } | |
164 | ||
165 | out: | |
166 | BN_free(x); | |
167 | BN_free(y); | |
168 | EC_KEY_free(eckey); | |
169 | EC_POINT_free(point); | |
170 | BN_CTX_free(ctx); | |
171 | return pkey; | |
172 | fail: | |
173 | EVP_PKEY_free(pkey); | |
174 | pkey = NULL; | |
175 | goto out; | |
176 | } | |
177 | ||
178 | ||
179 | static EVP_PKEY * dpp_set_pubkey_point(EVP_PKEY *group_key, | |
180 | const u8 *buf, size_t len) | |
181 | { | |
182 | EC_KEY *eckey; | |
183 | const EC_GROUP *group; | |
184 | EVP_PKEY *pkey = NULL; | |
185 | ||
186 | if (len & 1) | |
187 | return NULL; | |
188 | ||
189 | eckey = EVP_PKEY_get1_EC_KEY(group_key); | |
190 | if (!eckey) { | |
191 | wpa_printf(MSG_ERROR, | |
192 | "DPP: Could not get EC_KEY from group_key"); | |
193 | return NULL; | |
194 | } | |
195 | ||
196 | group = EC_KEY_get0_group(eckey); | |
197 | if (group) | |
198 | pkey = dpp_set_pubkey_point_group(group, buf, buf + len / 2, | |
199 | len / 2); | |
200 | else | |
201 | wpa_printf(MSG_ERROR, "DPP: Could not get EC group"); | |
202 | ||
203 | EC_KEY_free(eckey); | |
204 | return pkey; | |
205 | } | |
206 | ||
207 | ||
208 | struct wpabuf * dpp_alloc_msg(enum dpp_public_action_frame_type type, | |
209 | size_t len) | |
210 | { | |
211 | struct wpabuf *msg; | |
212 | ||
213 | msg = wpabuf_alloc(7 + len); | |
214 | if (!msg) | |
215 | return NULL; | |
216 | wpabuf_put_u8(msg, WLAN_ACTION_PUBLIC); | |
217 | wpabuf_put_u8(msg, WLAN_PA_VENDOR_SPECIFIC); | |
218 | wpabuf_put_be24(msg, OUI_WFA); | |
219 | wpabuf_put_u8(msg, DPP_OUI_TYPE); | |
220 | wpabuf_put_u8(msg, type); | |
221 | return msg; | |
222 | } | |
223 | ||
224 | ||
225 | const u8 * dpp_get_attr(const u8 *buf, size_t len, u16 req_id, u16 *ret_len) | |
226 | { | |
227 | u16 id, alen; | |
228 | const u8 *pos = buf, *end = buf + len; | |
229 | ||
230 | while (end - pos >= 4) { | |
231 | id = WPA_GET_LE16(pos); | |
232 | pos += 2; | |
233 | alen = WPA_GET_LE16(pos); | |
234 | pos += 2; | |
235 | if (alen > end - pos) | |
236 | return NULL; | |
237 | if (id == req_id) { | |
238 | *ret_len = alen; | |
239 | return pos; | |
240 | } | |
241 | pos += alen; | |
242 | } | |
243 | ||
244 | return NULL; | |
245 | } | |
246 | ||
247 | ||
248 | int dpp_check_attrs(const u8 *buf, size_t len) | |
249 | { | |
250 | const u8 *pos, *end; | |
251 | ||
252 | pos = buf; | |
253 | end = buf + len; | |
254 | while (end - pos >= 4) { | |
255 | u16 id, alen; | |
256 | ||
257 | id = WPA_GET_LE16(pos); | |
258 | pos += 2; | |
259 | alen = WPA_GET_LE16(pos); | |
260 | pos += 2; | |
261 | wpa_printf(MSG_MSGDUMP, "DPP: Attribute ID %04x len %u", | |
262 | id, alen); | |
263 | if (alen > end - pos) { | |
264 | wpa_printf(MSG_DEBUG, | |
265 | "DPP: Truncated message - not enough room for the attribute - dropped"); | |
266 | return -1; | |
267 | } | |
268 | pos += alen; | |
269 | } | |
270 | ||
271 | if (end != pos) { | |
272 | wpa_printf(MSG_DEBUG, | |
273 | "DPP: Unexpected octets (%d) after the last attribute", | |
274 | (int) (end - pos)); | |
275 | return -1; | |
276 | } | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
281 | ||
be27e185 JM |
282 | void dpp_bootstrap_info_free(struct dpp_bootstrap_info *info) |
283 | { | |
284 | if (!info) | |
285 | return; | |
286 | os_free(info->uri); | |
287 | os_free(info->info); | |
288 | EVP_PKEY_free(info->pubkey); | |
289 | os_free(info); | |
290 | } | |
291 | ||
292 | ||
293 | static int dpp_uri_valid_info(const char *info) | |
294 | { | |
295 | while (*info) { | |
296 | unsigned char val = *info++; | |
297 | ||
298 | if (val < 0x20 || val > 0x7e || val == 0x3b) | |
299 | return 0; | |
300 | } | |
301 | ||
302 | return 1; | |
303 | } | |
304 | ||
305 | ||
306 | static int dpp_clone_uri(struct dpp_bootstrap_info *bi, const char *uri) | |
307 | { | |
308 | bi->uri = os_strdup(uri); | |
309 | return bi->uri ? 0 : -1; | |
310 | } | |
311 | ||
312 | ||
313 | int dpp_parse_uri_chan_list(struct dpp_bootstrap_info *bi, | |
314 | const char *chan_list) | |
315 | { | |
316 | const char *pos = chan_list; | |
317 | int opclass, channel, freq; | |
318 | ||
319 | while (pos && *pos && *pos != ';') { | |
320 | opclass = atoi(pos); | |
321 | if (opclass <= 0) | |
322 | goto fail; | |
323 | pos = os_strchr(pos, '/'); | |
324 | if (!pos) | |
325 | goto fail; | |
326 | pos++; | |
327 | channel = atoi(pos); | |
328 | if (channel <= 0) | |
329 | goto fail; | |
330 | while (*pos >= '0' && *pos <= '9') | |
331 | pos++; | |
332 | freq = ieee80211_chan_to_freq(NULL, opclass, channel); | |
333 | wpa_printf(MSG_DEBUG, | |
334 | "DPP: URI channel-list: opclass=%d channel=%d ==> freq=%d", | |
335 | opclass, channel, freq); | |
336 | if (freq < 0) { | |
337 | wpa_printf(MSG_DEBUG, | |
338 | "DPP: Ignore unknown URI channel-list channel (opclass=%d channel=%d)", | |
339 | opclass, channel); | |
340 | } else if (bi->num_freq == DPP_BOOTSTRAP_MAX_FREQ) { | |
341 | wpa_printf(MSG_DEBUG, | |
342 | "DPP: Too many channels in URI channel-list - ignore list"); | |
343 | bi->num_freq = 0; | |
344 | break; | |
345 | } else { | |
346 | bi->freq[bi->num_freq++] = freq; | |
347 | } | |
348 | ||
349 | if (*pos == ';' || *pos == '\0') | |
350 | break; | |
351 | if (*pos != ',') | |
352 | goto fail; | |
353 | pos++; | |
354 | } | |
355 | ||
356 | return 0; | |
357 | fail: | |
358 | wpa_printf(MSG_DEBUG, "DPP: Invalid URI channel-list"); | |
359 | return -1; | |
360 | } | |
361 | ||
362 | ||
363 | int dpp_parse_uri_mac(struct dpp_bootstrap_info *bi, const char *mac) | |
364 | { | |
365 | if (!mac) | |
366 | return 0; | |
367 | ||
368 | if (hwaddr_aton2(mac, bi->mac_addr) < 0) { | |
369 | wpa_printf(MSG_DEBUG, "DPP: Invalid URI mac"); | |
370 | return -1; | |
371 | } | |
372 | ||
373 | wpa_printf(MSG_DEBUG, "DPP: URI mac: " MACSTR, MAC2STR(bi->mac_addr)); | |
374 | ||
375 | return 0; | |
376 | } | |
377 | ||
378 | ||
379 | int dpp_parse_uri_info(struct dpp_bootstrap_info *bi, const char *info) | |
380 | { | |
381 | const char *end; | |
382 | ||
383 | if (!info) | |
384 | return 0; | |
385 | ||
386 | end = os_strchr(info, ';'); | |
387 | if (!end) | |
388 | end = info + os_strlen(info); | |
389 | bi->info = os_malloc(end - info + 1); | |
390 | if (!bi->info) | |
391 | return -1; | |
392 | os_memcpy(bi->info, info, end - info); | |
393 | bi->info[end - info] = '\0'; | |
394 | wpa_printf(MSG_DEBUG, "DPP: URI(information): %s", bi->info); | |
395 | if (!dpp_uri_valid_info(bi->info)) { | |
396 | wpa_printf(MSG_DEBUG, "DPP: Invalid URI information payload"); | |
397 | return -1; | |
398 | } | |
399 | ||
400 | return 0; | |
401 | } | |
402 | ||
403 | ||
404 | static const struct dpp_curve_params * | |
405 | dpp_get_curve_oid(const ASN1_OBJECT *poid) | |
406 | { | |
407 | ASN1_OBJECT *oid; | |
408 | int i; | |
409 | ||
410 | for (i = 0; dpp_curves[i].name; i++) { | |
411 | oid = OBJ_txt2obj(dpp_curves[i].name, 0); | |
412 | if (oid && OBJ_cmp(poid, oid) == 0) | |
413 | return &dpp_curves[i]; | |
414 | } | |
415 | return NULL; | |
416 | } | |
417 | ||
418 | ||
419 | static const struct dpp_curve_params * dpp_get_curve_nid(int nid) | |
420 | { | |
421 | int i, tmp; | |
422 | ||
423 | if (!nid) | |
424 | return NULL; | |
425 | for (i = 0; dpp_curves[i].name; i++) { | |
426 | tmp = OBJ_txt2nid(dpp_curves[i].name); | |
427 | if (tmp == nid) | |
428 | return &dpp_curves[i]; | |
429 | } | |
430 | return NULL; | |
431 | } | |
432 | ||
433 | ||
434 | static int dpp_parse_uri_pk(struct dpp_bootstrap_info *bi, const char *info) | |
435 | { | |
436 | const char *end; | |
437 | u8 *data; | |
438 | size_t data_len; | |
439 | EVP_PKEY *pkey; | |
440 | const unsigned char *p; | |
441 | int res; | |
442 | X509_PUBKEY *pub = NULL; | |
443 | ASN1_OBJECT *ppkalg; | |
444 | const unsigned char *pk; | |
445 | int ppklen; | |
446 | X509_ALGOR *pa; | |
447 | ASN1_OBJECT *pa_oid; | |
448 | const void *pval; | |
449 | int ptype; | |
450 | const ASN1_OBJECT *poid; | |
451 | char buf[100]; | |
452 | ||
453 | end = os_strchr(info, ';'); | |
454 | if (!end) | |
455 | return -1; | |
456 | ||
457 | data = base64_decode((const unsigned char *) info, end - info, | |
458 | &data_len); | |
459 | if (!data) { | |
460 | wpa_printf(MSG_DEBUG, | |
461 | "DPP: Invalid base64 encoding on URI public-key"); | |
462 | return -1; | |
463 | } | |
464 | wpa_hexdump(MSG_DEBUG, "DPP: Base64 decoded URI public-key", | |
465 | data, data_len); | |
466 | ||
467 | if (sha256_vector(1, (const u8 **) &data, &data_len, | |
468 | bi->pubkey_hash) < 0) { | |
469 | wpa_printf(MSG_DEBUG, "DPP: Failed to hash public key"); | |
470 | return -1; | |
471 | } | |
30d27b04 JM |
472 | wpa_hexdump(MSG_DEBUG, "DPP: Public key hash", |
473 | bi->pubkey_hash, SHA256_MAC_LEN); | |
be27e185 JM |
474 | |
475 | /* DER encoded ASN.1 SubjectPublicKeyInfo | |
476 | * | |
477 | * SubjectPublicKeyInfo ::= SEQUENCE { | |
478 | * algorithm AlgorithmIdentifier, | |
479 | * subjectPublicKey BIT STRING } | |
480 | * | |
481 | * AlgorithmIdentifier ::= SEQUENCE { | |
482 | * algorithm OBJECT IDENTIFIER, | |
483 | * parameters ANY DEFINED BY algorithm OPTIONAL } | |
484 | * | |
485 | * subjectPublicKey = compressed format public key per ANSI X9.63 | |
486 | * algorithm = ecPublicKey (1.2.840.10045.2.1) | |
487 | * parameters = shall be present and shall be OBJECT IDENTIFIER; e.g., | |
488 | * prime256v1 (1.2.840.10045.3.1.7) | |
489 | */ | |
490 | ||
491 | p = data; | |
492 | pkey = d2i_PUBKEY(NULL, &p, data_len); | |
493 | os_free(data); | |
494 | ||
495 | if (!pkey) { | |
496 | wpa_printf(MSG_DEBUG, | |
497 | "DPP: Could not parse URI public-key SubjectPublicKeyInfo"); | |
498 | return -1; | |
499 | } | |
500 | ||
501 | if (EVP_PKEY_type(EVP_PKEY_id(pkey)) != EVP_PKEY_EC) { | |
502 | wpa_printf(MSG_DEBUG, | |
503 | "DPP: SubjectPublicKeyInfo does not describe an EC key"); | |
504 | EVP_PKEY_free(pkey); | |
505 | return -1; | |
506 | } | |
507 | ||
508 | res = X509_PUBKEY_set(&pub, pkey); | |
509 | if (res != 1) { | |
510 | wpa_printf(MSG_DEBUG, "DPP: Could not set pubkey"); | |
511 | goto fail; | |
512 | } | |
513 | ||
514 | res = X509_PUBKEY_get0_param(&ppkalg, &pk, &ppklen, &pa, pub); | |
515 | if (res != 1) { | |
516 | wpa_printf(MSG_DEBUG, | |
517 | "DPP: Could not extract SubjectPublicKeyInfo parameters"); | |
518 | goto fail; | |
519 | } | |
520 | res = OBJ_obj2txt(buf, sizeof(buf), ppkalg, 0); | |
521 | if (res < 0 || (size_t) res >= sizeof(buf)) { | |
522 | wpa_printf(MSG_DEBUG, | |
523 | "DPP: Could not extract SubjectPublicKeyInfo algorithm"); | |
524 | goto fail; | |
525 | } | |
526 | wpa_printf(MSG_DEBUG, "DPP: URI subjectPublicKey algorithm: %s", buf); | |
527 | if (os_strcmp(buf, "id-ecPublicKey") != 0) { | |
528 | wpa_printf(MSG_DEBUG, | |
529 | "DPP: Unsupported SubjectPublicKeyInfo algorithm"); | |
530 | goto fail; | |
531 | } | |
532 | ||
533 | X509_ALGOR_get0(&pa_oid, &ptype, (void *) &pval, pa); | |
534 | if (ptype != V_ASN1_OBJECT) { | |
535 | wpa_printf(MSG_DEBUG, | |
536 | "DPP: SubjectPublicKeyInfo parameters did not contain an OID"); | |
537 | goto fail; | |
538 | } | |
539 | poid = pval; | |
540 | res = OBJ_obj2txt(buf, sizeof(buf), poid, 0); | |
541 | if (res < 0 || (size_t) res >= sizeof(buf)) { | |
542 | wpa_printf(MSG_DEBUG, | |
543 | "DPP: Could not extract SubjectPublicKeyInfo parameters OID"); | |
544 | goto fail; | |
545 | } | |
546 | wpa_printf(MSG_DEBUG, "DPP: URI subjectPublicKey parameters: %s", buf); | |
547 | bi->curve = dpp_get_curve_oid(poid); | |
548 | if (!bi->curve) { | |
549 | wpa_printf(MSG_DEBUG, | |
550 | "DPP: Unsupported SubjectPublicKeyInfo curve: %s", | |
551 | buf); | |
552 | goto fail; | |
553 | } | |
554 | ||
555 | wpa_hexdump(MSG_DEBUG, "DPP: URI subjectPublicKey", pk, ppklen); | |
556 | ||
557 | X509_PUBKEY_free(pub); | |
558 | bi->pubkey = pkey; | |
559 | return 0; | |
560 | fail: | |
561 | X509_PUBKEY_free(pub); | |
562 | EVP_PKEY_free(pkey); | |
563 | return -1; | |
564 | } | |
565 | ||
566 | ||
567 | static struct dpp_bootstrap_info * dpp_parse_uri(const char *uri) | |
568 | { | |
569 | const char *pos = uri; | |
570 | const char *end; | |
571 | const char *chan_list = NULL, *mac = NULL, *info = NULL, *pk = NULL; | |
572 | struct dpp_bootstrap_info *bi; | |
573 | ||
574 | wpa_hexdump_ascii(MSG_DEBUG, "DPP: URI", uri, os_strlen(uri)); | |
575 | ||
576 | if (os_strncmp(pos, "DPP:", 4) != 0) { | |
577 | wpa_printf(MSG_INFO, "DPP: Not a DPP URI"); | |
578 | return NULL; | |
579 | } | |
580 | pos += 4; | |
581 | ||
582 | for (;;) { | |
583 | end = os_strchr(pos, ';'); | |
584 | if (!end) | |
585 | break; | |
586 | ||
587 | if (end == pos) { | |
588 | /* Handle terminating ";;" and ignore unexpected ";" | |
589 | * for parsing robustness. */ | |
590 | pos++; | |
591 | continue; | |
592 | } | |
593 | ||
594 | if (pos[0] == 'C' && pos[1] == ':' && !chan_list) | |
595 | chan_list = pos + 2; | |
596 | else if (pos[0] == 'M' && pos[1] == ':' && !mac) | |
597 | mac = pos + 2; | |
598 | else if (pos[0] == 'I' && pos[1] == ':' && !info) | |
599 | info = pos + 2; | |
600 | else if (pos[0] == 'K' && pos[1] == ':' && !pk) | |
601 | pk = pos + 2; | |
602 | else | |
603 | wpa_hexdump_ascii(MSG_DEBUG, | |
604 | "DPP: Ignore unrecognized URI parameter", | |
605 | pos, end - pos); | |
606 | pos = end + 1; | |
607 | } | |
608 | ||
609 | if (!pk) { | |
610 | wpa_printf(MSG_INFO, "DPP: URI missing public-key"); | |
611 | return NULL; | |
612 | } | |
613 | ||
614 | bi = os_zalloc(sizeof(*bi)); | |
615 | if (!bi) | |
616 | return NULL; | |
617 | ||
618 | if (dpp_clone_uri(bi, uri) < 0 || | |
619 | dpp_parse_uri_chan_list(bi, chan_list) < 0 || | |
620 | dpp_parse_uri_mac(bi, mac) < 0 || | |
621 | dpp_parse_uri_info(bi, info) < 0 || | |
622 | dpp_parse_uri_pk(bi, pk) < 0) { | |
623 | dpp_bootstrap_info_free(bi); | |
624 | bi = NULL; | |
625 | } | |
626 | ||
627 | return bi; | |
628 | } | |
629 | ||
630 | ||
631 | struct dpp_bootstrap_info * dpp_parse_qr_code(const char *uri) | |
632 | { | |
633 | struct dpp_bootstrap_info *bi; | |
634 | ||
635 | bi = dpp_parse_uri(uri); | |
636 | if (bi) | |
637 | bi->type = DPP_BOOTSTRAP_QR_CODE; | |
638 | return bi; | |
639 | } | |
640 | ||
641 | ||
642 | static void dpp_debug_print_key(const char *title, EVP_PKEY *key) | |
643 | { | |
644 | EC_KEY *eckey; | |
645 | BIO *out; | |
646 | size_t rlen; | |
647 | char *txt; | |
648 | int res; | |
649 | unsigned char *der = NULL; | |
650 | int der_len; | |
651 | ||
652 | out = BIO_new(BIO_s_mem()); | |
653 | if (!out) | |
654 | return; | |
655 | ||
656 | EVP_PKEY_print_private(out, key, 0, NULL); | |
657 | rlen = BIO_ctrl_pending(out); | |
658 | txt = os_malloc(rlen + 1); | |
659 | if (txt) { | |
660 | res = BIO_read(out, txt, rlen); | |
661 | if (res > 0) { | |
662 | txt[res] = '\0'; | |
663 | wpa_printf(MSG_DEBUG, "%s: %s", title, txt); | |
664 | } | |
665 | os_free(txt); | |
666 | } | |
667 | BIO_free(out); | |
668 | ||
669 | eckey = EVP_PKEY_get1_EC_KEY(key); | |
670 | if (!eckey) | |
671 | return; | |
672 | ||
673 | der_len = i2d_ECPrivateKey(eckey, &der); | |
674 | if (der_len > 0) | |
675 | wpa_hexdump_key(MSG_DEBUG, "DPP: ECPrivateKey", der, der_len); | |
676 | OPENSSL_free(der); | |
677 | if (der_len <= 0) { | |
678 | der = NULL; | |
679 | der_len = i2d_EC_PUBKEY(eckey, &der); | |
680 | if (der_len > 0) | |
681 | wpa_hexdump(MSG_DEBUG, "DPP: EC_PUBKEY", der, der_len); | |
682 | OPENSSL_free(der); | |
683 | } | |
684 | ||
685 | EC_KEY_free(eckey); | |
686 | } | |
687 | ||
688 | ||
689 | static EVP_PKEY * dpp_gen_keypair(const struct dpp_curve_params *curve) | |
690 | { | |
691 | #ifdef OPENSSL_IS_BORINGSSL | |
692 | EVP_PKEY_CTX *kctx = NULL; | |
693 | const EC_GROUP *group; | |
694 | EC_KEY *ec_params; | |
695 | #else | |
696 | EVP_PKEY_CTX *pctx, *kctx = NULL; | |
697 | #endif | |
698 | EVP_PKEY *params = NULL, *key = NULL; | |
699 | int nid; | |
700 | ||
701 | wpa_printf(MSG_DEBUG, "DPP: Generating a keypair"); | |
702 | ||
703 | nid = OBJ_txt2nid(curve->name); | |
704 | if (nid == NID_undef) { | |
705 | wpa_printf(MSG_INFO, "DPP: Unsupported curve %s", curve->name); | |
706 | return NULL; | |
707 | } | |
708 | #ifdef OPENSSL_IS_BORINGSSL | |
709 | group = EC_GROUP_new_by_curve_name(nid); | |
710 | ec_params = EC_KEY_new(); | |
711 | if (!ec_params || EC_KEY_set_group(ec_params, group) != 1) { | |
712 | wpa_printf(MSG_ERROR, | |
713 | "DPP: Failed to generate EC_KEY parameters"); | |
714 | goto fail; | |
715 | } | |
716 | EC_KEY_set_asn1_flag(ec_params, OPENSSL_EC_NAMED_CURVE); | |
717 | params = EVP_PKEY_new(); | |
718 | if (!params || EVP_PKEY_set1_EC_KEY(params, ec_params) != 1) { | |
719 | wpa_printf(MSG_ERROR, | |
720 | "DPP: Failed to generate EVP_PKEY parameters"); | |
721 | goto fail; | |
722 | } | |
723 | #else | |
724 | pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_EC, NULL); | |
725 | if (!pctx || | |
726 | EVP_PKEY_paramgen_init(pctx) != 1 || | |
727 | EVP_PKEY_CTX_set_ec_paramgen_curve_nid(pctx, nid) != 1 || | |
728 | EVP_PKEY_CTX_set_ec_param_enc(pctx, OPENSSL_EC_NAMED_CURVE) != 1 || | |
729 | EVP_PKEY_paramgen(pctx, ¶ms) != 1) { | |
730 | wpa_printf(MSG_ERROR, | |
731 | "DPP: Failed to generate EVP_PKEY parameters"); | |
732 | EVP_PKEY_CTX_free(pctx); | |
733 | goto fail; | |
734 | } | |
735 | EVP_PKEY_CTX_free(pctx); | |
736 | #endif | |
737 | ||
738 | kctx = EVP_PKEY_CTX_new(params, NULL); | |
739 | if (!kctx || | |
740 | EVP_PKEY_keygen_init(kctx) != 1 || | |
741 | EVP_PKEY_keygen(kctx, &key) != 1) { | |
742 | wpa_printf(MSG_ERROR, "DPP: Failed to generate EC key"); | |
743 | goto fail; | |
744 | } | |
745 | ||
746 | if (wpa_debug_show_keys) | |
747 | dpp_debug_print_key("Own generated key", key); | |
748 | ||
749 | EVP_PKEY_free(params); | |
750 | EVP_PKEY_CTX_free(kctx); | |
751 | return key; | |
752 | fail: | |
753 | EVP_PKEY_CTX_free(kctx); | |
754 | EVP_PKEY_free(params); | |
755 | return NULL; | |
756 | } | |
757 | ||
758 | ||
759 | static const struct dpp_curve_params * | |
760 | dpp_get_curve_name(const char *name) | |
761 | { | |
762 | int i; | |
763 | ||
764 | for (i = 0; dpp_curves[i].name; i++) { | |
765 | if (os_strcmp(name, dpp_curves[i].name) == 0 || | |
766 | (dpp_curves[i].jwk_crv && | |
767 | os_strcmp(name, dpp_curves[i].jwk_crv) == 0)) | |
768 | return &dpp_curves[i]; | |
769 | } | |
770 | return NULL; | |
771 | } | |
772 | ||
773 | ||
461d39af JM |
774 | static const struct dpp_curve_params * |
775 | dpp_get_curve_jwk_crv(const char *name) | |
776 | { | |
777 | int i; | |
778 | ||
779 | for (i = 0; dpp_curves[i].name; i++) { | |
780 | if (dpp_curves[i].jwk_crv && | |
781 | os_strcmp(name, dpp_curves[i].jwk_crv) == 0) | |
782 | return &dpp_curves[i]; | |
783 | } | |
784 | return NULL; | |
785 | } | |
786 | ||
787 | ||
be27e185 JM |
788 | static EVP_PKEY * dpp_set_keypair(const struct dpp_curve_params **curve, |
789 | const u8 *privkey, size_t privkey_len) | |
790 | { | |
791 | EVP_PKEY *pkey; | |
792 | EC_KEY *eckey; | |
793 | const EC_GROUP *group; | |
794 | int nid; | |
795 | ||
796 | pkey = EVP_PKEY_new(); | |
797 | if (!pkey) | |
798 | return NULL; | |
799 | eckey = d2i_ECPrivateKey(NULL, &privkey, privkey_len); | |
800 | if (!eckey) { | |
801 | wpa_printf(MSG_INFO, | |
802 | "DPP: OpenSSL: d2i_ECPrivateKey() failed: %s", | |
803 | ERR_error_string(ERR_get_error(), NULL)); | |
804 | EVP_PKEY_free(pkey); | |
805 | return NULL; | |
806 | } | |
807 | group = EC_KEY_get0_group(eckey); | |
808 | if (!group) { | |
809 | EC_KEY_free(eckey); | |
810 | EVP_PKEY_free(pkey); | |
811 | return NULL; | |
812 | } | |
813 | nid = EC_GROUP_get_curve_name(group); | |
814 | *curve = dpp_get_curve_nid(nid); | |
815 | if (!*curve) { | |
816 | wpa_printf(MSG_INFO, | |
817 | "DPP: Unsupported curve (nid=%d) in pre-assigned key", | |
818 | nid); | |
819 | EC_KEY_free(eckey); | |
820 | EVP_PKEY_free(pkey); | |
821 | return NULL; | |
822 | } | |
823 | ||
824 | if (EVP_PKEY_assign_EC_KEY(pkey, eckey) != 1) { | |
825 | EC_KEY_free(eckey); | |
826 | EVP_PKEY_free(pkey); | |
827 | return NULL; | |
828 | } | |
829 | return pkey; | |
830 | } | |
831 | ||
832 | ||
833 | char * dpp_keygen(struct dpp_bootstrap_info *bi, const char *curve, | |
834 | const u8 *privkey, size_t privkey_len) | |
835 | { | |
836 | unsigned char *base64 = NULL; | |
837 | char *pos, *end; | |
838 | size_t len; | |
839 | unsigned char *der = NULL; | |
840 | int der_len; | |
841 | EC_KEY *eckey; | |
842 | ||
843 | if (!curve) { | |
844 | bi->curve = &dpp_curves[0]; | |
845 | } else { | |
846 | bi->curve = dpp_get_curve_name(curve); | |
847 | if (!bi->curve) { | |
848 | wpa_printf(MSG_INFO, "DPP: Unsupported curve: %s", | |
849 | curve); | |
850 | return NULL; | |
851 | } | |
852 | } | |
853 | if (privkey) | |
854 | bi->pubkey = dpp_set_keypair(&bi->curve, privkey, privkey_len); | |
855 | else | |
856 | bi->pubkey = dpp_gen_keypair(bi->curve); | |
857 | if (!bi->pubkey) | |
858 | goto fail; | |
859 | bi->own = 1; | |
860 | ||
861 | /* Need to get the compressed form of the public key through EC_KEY, so | |
862 | * cannot use the simpler i2d_PUBKEY() here. */ | |
863 | eckey = EVP_PKEY_get1_EC_KEY(bi->pubkey); | |
864 | if (!eckey) | |
865 | goto fail; | |
866 | EC_KEY_set_conv_form(eckey, POINT_CONVERSION_COMPRESSED); | |
867 | der_len = i2d_EC_PUBKEY(eckey, &der); | |
868 | EC_KEY_free(eckey); | |
869 | if (der_len <= 0) { | |
870 | wpa_printf(MSG_ERROR, | |
871 | "DDP: Failed to build DER encoded public key"); | |
872 | goto fail; | |
873 | } | |
874 | ||
875 | len = der_len; | |
876 | if (sha256_vector(1, (const u8 **) &der, &len, bi->pubkey_hash) < 0) { | |
877 | wpa_printf(MSG_DEBUG, "DPP: Failed to hash public key"); | |
878 | goto fail; | |
879 | } | |
880 | ||
881 | base64 = base64_encode(der, der_len, &len); | |
882 | OPENSSL_free(der); | |
883 | if (!base64) | |
884 | goto fail; | |
885 | pos = (char *) base64; | |
886 | end = pos + len; | |
887 | for (;;) { | |
888 | pos = os_strchr(pos, '\n'); | |
889 | if (!pos) | |
890 | break; | |
891 | os_memmove(pos, pos + 1, end - pos); | |
892 | } | |
893 | return (char *) base64; | |
894 | fail: | |
895 | os_free(base64); | |
896 | OPENSSL_free(der); | |
897 | return NULL; | |
898 | } | |
30d27b04 JM |
899 | |
900 | ||
901 | static int dpp_derive_k1(const u8 *Mx, size_t Mx_len, u8 *k1, | |
902 | unsigned int hash_len) | |
903 | { | |
904 | u8 salt[DPP_MAX_HASH_LEN], prk[DPP_MAX_HASH_LEN]; | |
905 | const char *info = "first intermediate key"; | |
906 | int res = -1; | |
907 | ||
908 | /* k1 = HKDF(<>, "first intermediate key", M.x) */ | |
909 | ||
910 | /* HKDF-Extract(<>, M.x) */ | |
911 | os_memset(salt, 0, hash_len); | |
912 | if (hash_len == 32) { | |
913 | if (hmac_sha256(salt, SHA256_MAC_LEN, Mx, Mx_len, prk) < 0) | |
914 | return -1; | |
915 | } else if (hash_len == 48) { | |
916 | if (hmac_sha384(salt, SHA384_MAC_LEN, Mx, Mx_len, prk) < 0) | |
917 | return -1; | |
918 | } else if (hash_len == 64) { | |
919 | if (hmac_sha512(salt, SHA512_MAC_LEN, Mx, Mx_len, prk) < 0) | |
920 | return -1; | |
921 | } else { | |
922 | return -1; | |
923 | } | |
924 | wpa_hexdump_key(MSG_DEBUG, "DPP: PRK = HKDF-Extract(<>, IKM=M.x)", | |
925 | prk, hash_len); | |
926 | ||
927 | /* HKDF-Expand(PRK, info, L) */ | |
928 | if (hash_len == 32) | |
929 | res = hmac_sha256_kdf(prk, SHA256_MAC_LEN, NULL, | |
930 | (const u8 *) info, os_strlen(info), | |
931 | k1, SHA256_MAC_LEN); | |
932 | else if (hash_len == 48) | |
933 | res = hmac_sha384_kdf(prk, SHA384_MAC_LEN, NULL, | |
934 | (const u8 *) info, os_strlen(info), | |
935 | k1, SHA384_MAC_LEN); | |
936 | else if (hash_len == 64) | |
937 | res = hmac_sha512_kdf(prk, SHA512_MAC_LEN, NULL, | |
938 | (const u8 *) info, os_strlen(info), | |
939 | k1, SHA512_MAC_LEN); | |
940 | os_memset(prk, 0, hash_len); | |
941 | if (res < 0) | |
942 | return -1; | |
943 | ||
944 | wpa_hexdump_key(MSG_DEBUG, "DPP: k1 = HKDF-Expand(PRK, info, L)", | |
945 | k1, hash_len); | |
946 | return 0; | |
947 | } | |
948 | ||
949 | ||
950 | static int dpp_derive_k2(const u8 *Nx, size_t Nx_len, u8 *k2, | |
951 | unsigned int hash_len) | |
952 | { | |
953 | u8 salt[DPP_MAX_HASH_LEN], prk[DPP_MAX_HASH_LEN]; | |
954 | const char *info = "second intermediate key"; | |
955 | int res; | |
956 | ||
957 | /* k2 = HKDF(<>, "second intermediate key", N.x) */ | |
958 | ||
959 | /* HKDF-Extract(<>, N.x) */ | |
960 | os_memset(salt, 0, hash_len); | |
961 | if (hash_len == 32) | |
962 | res = hmac_sha256(salt, SHA256_MAC_LEN, Nx, Nx_len, prk); | |
963 | else if (hash_len == 48) | |
964 | res = hmac_sha384(salt, SHA384_MAC_LEN, Nx, Nx_len, prk); | |
965 | else if (hash_len == 64) | |
966 | res = hmac_sha512(salt, SHA512_MAC_LEN, Nx, Nx_len, prk); | |
967 | else | |
968 | res = -1; | |
969 | if (res < 0) | |
970 | return -1; | |
971 | wpa_hexdump_key(MSG_DEBUG, "DPP: PRK = HKDF-Extract(<>, IKM=N.x)", | |
972 | prk, hash_len); | |
973 | ||
974 | /* HKDF-Expand(PRK, info, L) */ | |
975 | if (hash_len == 32) | |
976 | res = hmac_sha256_kdf(prk, SHA256_MAC_LEN, NULL, | |
977 | (const u8 *) info, os_strlen(info), | |
978 | k2, SHA256_MAC_LEN); | |
979 | else if (hash_len == 48) | |
980 | res = hmac_sha384_kdf(prk, SHA384_MAC_LEN, NULL, | |
981 | (const u8 *) info, os_strlen(info), | |
982 | k2, SHA384_MAC_LEN); | |
983 | else if (hash_len == 64) | |
984 | res = hmac_sha512_kdf(prk, SHA512_MAC_LEN, NULL, | |
985 | (const u8 *) info, os_strlen(info), | |
986 | k2, SHA512_MAC_LEN); | |
987 | os_memset(prk, 0, hash_len); | |
988 | if (res < 0) | |
989 | return -1; | |
990 | ||
991 | wpa_hexdump_key(MSG_DEBUG, "DPP: k2 = HKDF-Expand(PRK, info, L)", | |
992 | k2, hash_len); | |
993 | return 0; | |
994 | } | |
995 | ||
996 | ||
997 | static int dpp_derive_ke(struct dpp_authentication *auth, u8 *ke, | |
998 | unsigned int hash_len) | |
999 | { | |
1000 | size_t nonce_len; | |
1001 | u8 nonces[2 * DPP_MAX_NONCE_LEN]; | |
1002 | const char *info_ke = "DPP Key"; | |
1003 | u8 prk[DPP_MAX_HASH_LEN]; | |
1004 | int res; | |
1005 | const u8 *addr[3]; | |
1006 | size_t len[3]; | |
1007 | size_t num_elem = 0; | |
1008 | ||
1009 | /* ke = HKDF(I-nonce | R-nonce, "DPP Key", M.x | N.x [| L.x]) */ | |
1010 | ||
1011 | /* HKDF-Extract(I-nonce | R-nonce, M.x | N.x [| L.x]) */ | |
1012 | nonce_len = auth->curve->nonce_len; | |
1013 | os_memcpy(nonces, auth->i_nonce, nonce_len); | |
1014 | os_memcpy(&nonces[nonce_len], auth->r_nonce, nonce_len); | |
1015 | addr[num_elem] = auth->Mx; | |
1016 | len[num_elem] = auth->secret_len; | |
1017 | num_elem++; | |
1018 | addr[num_elem] = auth->Nx; | |
1019 | len[num_elem] = auth->secret_len; | |
1020 | num_elem++; | |
1021 | if (auth->peer_bi && auth->own_bi) { | |
1022 | addr[num_elem] = auth->Lx; | |
1023 | len[num_elem] = auth->secret_len; | |
1024 | num_elem++; | |
1025 | } | |
1026 | if (hash_len == 32) | |
1027 | res = hmac_sha256_vector(nonces, 2 * nonce_len, | |
1028 | num_elem, addr, len, prk); | |
1029 | else if (hash_len == 48) | |
1030 | res = hmac_sha384_vector(nonces, 2 * nonce_len, | |
1031 | num_elem, addr, len, prk); | |
1032 | else if (hash_len == 64) | |
1033 | res = hmac_sha512_vector(nonces, 2 * nonce_len, | |
1034 | num_elem, addr, len, prk); | |
1035 | else | |
1036 | res = -1; | |
1037 | if (res < 0) | |
1038 | return -1; | |
1039 | wpa_hexdump_key(MSG_DEBUG, "DPP: PRK = HKDF-Extract(<>, IKM)", | |
1040 | prk, hash_len); | |
1041 | ||
1042 | /* HKDF-Expand(PRK, info, L) */ | |
1043 | if (hash_len == 32) | |
1044 | res = hmac_sha256_kdf(prk, SHA256_MAC_LEN, NULL, | |
1045 | (const u8 *) info_ke, os_strlen(info_ke), | |
1046 | ke, SHA256_MAC_LEN); | |
1047 | else if (hash_len == 48) | |
1048 | res = hmac_sha384_kdf(prk, SHA384_MAC_LEN, NULL, | |
1049 | (const u8 *) info_ke, os_strlen(info_ke), | |
1050 | ke, SHA384_MAC_LEN); | |
1051 | else if (hash_len == 64) | |
1052 | res = hmac_sha512_kdf(prk, SHA512_MAC_LEN, NULL, | |
1053 | (const u8 *) info_ke, os_strlen(info_ke), | |
1054 | ke, SHA512_MAC_LEN); | |
1055 | os_memset(prk, 0, hash_len); | |
1056 | if (res < 0) | |
1057 | return -1; | |
1058 | ||
1059 | wpa_hexdump_key(MSG_DEBUG, "DPP: ke = HKDF-Expand(PRK, info, L)", | |
1060 | ke, hash_len); | |
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | ||
1065 | struct dpp_authentication * dpp_auth_init(void *msg_ctx, | |
1066 | struct dpp_bootstrap_info *peer_bi, | |
1067 | struct dpp_bootstrap_info *own_bi, | |
1068 | int configurator) | |
1069 | { | |
1070 | struct dpp_authentication *auth; | |
1071 | size_t nonce_len; | |
1072 | EVP_PKEY_CTX *ctx = NULL; | |
1073 | size_t secret_len; | |
1074 | struct wpabuf *msg, *pi = NULL; | |
1075 | u8 clear[4 + DPP_MAX_NONCE_LEN + 4 + 1]; | |
1076 | u8 wrapped_data[4 + DPP_MAX_NONCE_LEN + 4 + 1 + AES_BLOCK_SIZE]; | |
1077 | u8 *pos; | |
1078 | const u8 *addr[1]; | |
1079 | size_t len[1], siv_len; | |
1080 | ||
1081 | auth = os_zalloc(sizeof(*auth)); | |
1082 | if (!auth) | |
1083 | return NULL; | |
1084 | auth->msg_ctx = msg_ctx; | |
1085 | auth->initiator = 1; | |
1086 | auth->configurator = configurator; | |
1087 | auth->peer_bi = peer_bi; | |
1088 | auth->own_bi = own_bi; | |
1089 | auth->curve = peer_bi->curve; | |
1090 | ||
1091 | nonce_len = auth->curve->nonce_len; | |
1092 | if (random_get_bytes(auth->i_nonce, nonce_len)) { | |
1093 | wpa_printf(MSG_ERROR, "DPP: Failed to generate I-nonce"); | |
1094 | goto fail; | |
1095 | } | |
1096 | wpa_hexdump(MSG_DEBUG, "DPP: I-nonce", auth->i_nonce, nonce_len); | |
1097 | ||
1098 | auth->own_protocol_key = dpp_gen_keypair(auth->curve); | |
1099 | if (!auth->own_protocol_key) | |
1100 | goto fail; | |
1101 | ||
1102 | pi = dpp_get_pubkey_point(auth->own_protocol_key, 0); | |
1103 | if (!pi) | |
1104 | goto fail; | |
1105 | ||
1106 | /* ECDH: M = pI * BR */ | |
1107 | ctx = EVP_PKEY_CTX_new(auth->own_protocol_key, NULL); | |
1108 | if (!ctx || | |
1109 | EVP_PKEY_derive_init(ctx) != 1 || | |
1110 | EVP_PKEY_derive_set_peer(ctx, auth->peer_bi->pubkey) != 1 || | |
1111 | EVP_PKEY_derive(ctx, NULL, &secret_len) != 1 || | |
1112 | secret_len > DPP_MAX_SHARED_SECRET_LEN || | |
1113 | EVP_PKEY_derive(ctx, auth->Mx, &secret_len) != 1) { | |
1114 | wpa_printf(MSG_ERROR, | |
1115 | "DPP: Failed to derive ECDH shared secret: %s", | |
1116 | ERR_error_string(ERR_get_error(), NULL)); | |
1117 | goto fail; | |
1118 | } | |
1119 | auth->secret_len = secret_len; | |
1120 | EVP_PKEY_CTX_free(ctx); | |
1121 | ctx = NULL; | |
1122 | ||
1123 | wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (M.x)", | |
1124 | auth->Mx, auth->secret_len); | |
1125 | ||
1126 | if (dpp_derive_k1(auth->Mx, auth->secret_len, auth->k1, | |
1127 | auth->curve->hash_len) < 0) | |
1128 | goto fail; | |
1129 | ||
1130 | /* Build DPP Authentication Request frame attributes */ | |
1131 | msg = wpabuf_alloc(2 * (4 + SHA256_MAC_LEN) + 4 + wpabuf_len(pi) + | |
1132 | 4 + sizeof(wrapped_data)); | |
1133 | if (!msg) | |
1134 | goto fail; | |
1135 | auth->req_attr = msg; | |
1136 | ||
1137 | /* Responder Bootstrapping Key Hash */ | |
1138 | wpabuf_put_le16(msg, DPP_ATTR_R_BOOTSTRAP_KEY_HASH); | |
1139 | wpabuf_put_le16(msg, SHA256_MAC_LEN); | |
1140 | wpabuf_put_data(msg, auth->peer_bi->pubkey_hash, SHA256_MAC_LEN); | |
1141 | ||
1142 | /* Initiator Bootstrapping Key Hash */ | |
1143 | wpabuf_put_le16(msg, DPP_ATTR_I_BOOTSTRAP_KEY_HASH); | |
1144 | wpabuf_put_le16(msg, SHA256_MAC_LEN); | |
1145 | if (auth->own_bi) | |
1146 | wpabuf_put_data(msg, auth->own_bi->pubkey_hash, SHA256_MAC_LEN); | |
1147 | else | |
1148 | os_memset(wpabuf_put(msg, SHA256_MAC_LEN), 0, SHA256_MAC_LEN); | |
1149 | ||
1150 | /* Initiator Protocol Key */ | |
1151 | wpabuf_put_le16(msg, DPP_ATTR_I_PROTOCOL_KEY); | |
1152 | wpabuf_put_le16(msg, wpabuf_len(pi)); | |
1153 | wpabuf_put_buf(msg, pi); | |
1154 | wpabuf_free(pi); | |
1155 | pi = NULL; | |
1156 | ||
1157 | /* Wrapped data ({I-nonce, I-capabilities}k1) */ | |
1158 | pos = clear; | |
1159 | /* I-nonce */ | |
1160 | WPA_PUT_LE16(pos, DPP_ATTR_I_NONCE); | |
1161 | pos += 2; | |
1162 | WPA_PUT_LE16(pos, nonce_len); | |
1163 | pos += 2; | |
1164 | os_memcpy(pos, auth->i_nonce, nonce_len); | |
1165 | pos += nonce_len; | |
1166 | /* I-capabilities */ | |
1167 | WPA_PUT_LE16(pos, DPP_ATTR_I_CAPABILITIES); | |
1168 | pos += 2; | |
1169 | WPA_PUT_LE16(pos, 1); | |
1170 | pos += 2; | |
1171 | auth->i_capab = configurator ? DPP_CAPAB_CONFIGURATOR : | |
1172 | DPP_CAPAB_ENROLLEE; | |
1173 | *pos++ = auth->i_capab; | |
1174 | ||
1175 | addr[0] = wpabuf_head(msg); | |
1176 | len[0] = wpabuf_len(msg); | |
1177 | wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD", addr[0], len[0]); | |
1178 | siv_len = pos - clear; | |
1179 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext", clear, siv_len); | |
1180 | if (aes_siv_encrypt(auth->k1, auth->curve->hash_len, clear, siv_len, | |
1181 | 1, addr, len, wrapped_data) < 0) | |
1182 | goto fail; | |
1183 | siv_len += AES_BLOCK_SIZE; | |
1184 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext", | |
1185 | wrapped_data, siv_len); | |
1186 | ||
1187 | wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA); | |
1188 | wpabuf_put_le16(msg, siv_len); | |
1189 | wpabuf_put_data(msg, wrapped_data, siv_len); | |
1190 | ||
1191 | wpa_hexdump_buf(MSG_DEBUG, | |
1192 | "DPP: Authentication Request frame attributes", msg); | |
1193 | ||
1194 | return auth; | |
1195 | fail: | |
1196 | wpabuf_free(pi); | |
1197 | EVP_PKEY_CTX_free(ctx); | |
1198 | dpp_auth_deinit(auth); | |
1199 | return NULL; | |
1200 | } | |
1201 | ||
1202 | ||
461d39af JM |
1203 | struct wpabuf * dpp_build_conf_req(struct dpp_authentication *auth, |
1204 | const char *json) | |
1205 | { | |
1206 | size_t nonce_len; | |
1207 | size_t json_len, clear_len; | |
1208 | struct wpabuf *clear = NULL, *msg = NULL; | |
1209 | u8 *wrapped; | |
1210 | ||
1211 | wpa_printf(MSG_DEBUG, "DPP: Build configuration request"); | |
1212 | ||
1213 | nonce_len = auth->curve->nonce_len; | |
1214 | if (random_get_bytes(auth->e_nonce, nonce_len)) { | |
1215 | wpa_printf(MSG_ERROR, "DPP: Failed to generate E-nonce"); | |
1216 | goto fail; | |
1217 | } | |
1218 | wpa_hexdump(MSG_DEBUG, "DPP: E-nonce", auth->e_nonce, nonce_len); | |
1219 | json_len = os_strlen(json); | |
1220 | wpa_hexdump_ascii(MSG_DEBUG, "DPP: configAttr JSON", json, json_len); | |
1221 | ||
1222 | /* { E-nonce, configAttrib }ke */ | |
1223 | clear_len = 4 + nonce_len + 4 + json_len; | |
1224 | clear = wpabuf_alloc(clear_len); | |
1225 | msg = wpabuf_alloc(4 + clear_len + AES_BLOCK_SIZE); | |
1226 | if (!clear || !msg) | |
1227 | goto fail; | |
1228 | ||
1229 | /* E-nonce */ | |
1230 | wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE); | |
1231 | wpabuf_put_le16(clear, nonce_len); | |
1232 | wpabuf_put_data(clear, auth->e_nonce, nonce_len); | |
1233 | ||
1234 | /* configAttrib */ | |
1235 | wpabuf_put_le16(clear, DPP_ATTR_CONFIG_ATTR_OBJ); | |
1236 | wpabuf_put_le16(clear, json_len); | |
1237 | wpabuf_put_data(clear, json, json_len); | |
1238 | ||
1239 | wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA); | |
1240 | wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE); | |
1241 | wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE); | |
1242 | ||
1243 | /* No AES-SIV AD */ | |
1244 | wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear); | |
1245 | if (aes_siv_encrypt(auth->ke, auth->curve->hash_len, | |
1246 | wpabuf_head(clear), wpabuf_len(clear), | |
1247 | 0, NULL, NULL, wrapped) < 0) | |
1248 | goto fail; | |
1249 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext", | |
1250 | wrapped, wpabuf_len(clear) + AES_BLOCK_SIZE); | |
1251 | ||
1252 | wpa_hexdump_buf(MSG_DEBUG, | |
1253 | "DPP: Configuration Request frame attributes", msg); | |
1254 | wpabuf_free(clear); | |
1255 | return msg; | |
1256 | ||
1257 | fail: | |
1258 | wpabuf_free(clear); | |
1259 | wpabuf_free(msg); | |
1260 | return NULL; | |
1261 | } | |
1262 | ||
1263 | ||
30d27b04 JM |
1264 | static void dpp_auth_success(struct dpp_authentication *auth) |
1265 | { | |
1266 | wpa_printf(MSG_DEBUG, | |
1267 | "DPP: Authentication success - clear temporary keys"); | |
1268 | os_memset(auth->Mx, 0, sizeof(auth->Mx)); | |
1269 | os_memset(auth->Nx, 0, sizeof(auth->Nx)); | |
1270 | os_memset(auth->Lx, 0, sizeof(auth->Lx)); | |
1271 | os_memset(auth->k1, 0, sizeof(auth->k1)); | |
1272 | os_memset(auth->k2, 0, sizeof(auth->k2)); | |
1273 | ||
1274 | auth->auth_success = 1; | |
1275 | } | |
1276 | ||
1277 | ||
1278 | static int dpp_gen_r_auth(struct dpp_authentication *auth, u8 *r_auth) | |
1279 | { | |
1280 | struct wpabuf *pix, *prx, *bix, *brx; | |
1281 | const u8 *addr[7]; | |
1282 | size_t len[7]; | |
1283 | size_t i, num_elem = 0; | |
1284 | size_t nonce_len; | |
1285 | u8 zero = 0; | |
1286 | int res = -1; | |
1287 | ||
1288 | /* R-auth = H(I-nonce | R-nonce | PI.x | PR.x | [BI.x |] BR.x | 0) */ | |
1289 | nonce_len = auth->curve->nonce_len; | |
1290 | ||
1291 | if (auth->initiator) { | |
1292 | pix = dpp_get_pubkey_point(auth->own_protocol_key, 0); | |
1293 | prx = dpp_get_pubkey_point(auth->peer_protocol_key, 0); | |
1294 | if (auth->own_bi) | |
1295 | bix = dpp_get_pubkey_point(auth->own_bi->pubkey, 0); | |
1296 | else | |
1297 | bix = NULL; | |
1298 | brx = dpp_get_pubkey_point(auth->peer_bi->pubkey, 0); | |
1299 | } else { | |
1300 | pix = dpp_get_pubkey_point(auth->peer_protocol_key, 0); | |
1301 | prx = dpp_get_pubkey_point(auth->own_protocol_key, 0); | |
1302 | if (auth->peer_bi) | |
1303 | bix = dpp_get_pubkey_point(auth->peer_bi->pubkey, 0); | |
1304 | else | |
1305 | bix = NULL; | |
1306 | brx = dpp_get_pubkey_point(auth->own_bi->pubkey, 0); | |
1307 | } | |
1308 | if (!pix || !prx || !brx) | |
1309 | goto fail; | |
1310 | ||
1311 | addr[num_elem] = auth->i_nonce; | |
1312 | len[num_elem] = nonce_len; | |
1313 | num_elem++; | |
1314 | ||
1315 | addr[num_elem] = auth->r_nonce; | |
1316 | len[num_elem] = nonce_len; | |
1317 | num_elem++; | |
1318 | ||
1319 | addr[num_elem] = wpabuf_head(pix); | |
1320 | len[num_elem] = wpabuf_len(pix) / 2; | |
1321 | num_elem++; | |
1322 | ||
1323 | addr[num_elem] = wpabuf_head(prx); | |
1324 | len[num_elem] = wpabuf_len(prx) / 2; | |
1325 | num_elem++; | |
1326 | ||
1327 | if (bix) { | |
1328 | addr[num_elem] = wpabuf_head(bix); | |
1329 | len[num_elem] = wpabuf_len(bix) / 2; | |
1330 | num_elem++; | |
1331 | } | |
1332 | ||
1333 | addr[num_elem] = wpabuf_head(brx); | |
1334 | len[num_elem] = wpabuf_len(brx) / 2; | |
1335 | num_elem++; | |
1336 | ||
1337 | addr[num_elem] = &zero; | |
1338 | len[num_elem] = 1; | |
1339 | num_elem++; | |
1340 | ||
1341 | wpa_printf(MSG_DEBUG, "DPP: R-auth hash components"); | |
1342 | for (i = 0; i < num_elem; i++) | |
1343 | wpa_hexdump(MSG_DEBUG, "DPP: hash component", addr[i], len[i]); | |
1344 | if (auth->curve->hash_len == 32) | |
1345 | res = sha256_vector(num_elem, addr, len, r_auth); | |
1346 | else if (auth->curve->hash_len == 48) | |
1347 | res = sha384_vector(num_elem, addr, len, r_auth); | |
1348 | else if (auth->curve->hash_len == 64) | |
1349 | res = sha512_vector(num_elem, addr, len, r_auth); | |
1350 | else | |
1351 | res = -1; | |
1352 | if (res == 0) | |
1353 | wpa_hexdump(MSG_DEBUG, "DPP: R-auth", r_auth, | |
1354 | auth->curve->hash_len); | |
1355 | fail: | |
1356 | wpabuf_free(pix); | |
1357 | wpabuf_free(prx); | |
1358 | wpabuf_free(bix); | |
1359 | wpabuf_free(brx); | |
1360 | return res; | |
1361 | } | |
1362 | ||
1363 | ||
1364 | static int dpp_gen_i_auth(struct dpp_authentication *auth, u8 *i_auth) | |
1365 | { | |
1366 | struct wpabuf *pix = NULL, *prx = NULL, *bix = NULL, *brx = NULL; | |
1367 | const u8 *addr[7]; | |
1368 | size_t len[7]; | |
1369 | size_t i, num_elem = 0; | |
1370 | size_t nonce_len; | |
1371 | u8 one = 1; | |
1372 | int res = -1; | |
1373 | ||
1374 | /* I-auth = H(R-nonce | I-nonce | PR.x | PI.x | BR.x | [BI.x |] 1) */ | |
1375 | nonce_len = auth->curve->nonce_len; | |
1376 | ||
1377 | if (auth->initiator) { | |
1378 | pix = dpp_get_pubkey_point(auth->own_protocol_key, 0); | |
1379 | prx = dpp_get_pubkey_point(auth->peer_protocol_key, 0); | |
1380 | if (auth->own_bi) | |
1381 | bix = dpp_get_pubkey_point(auth->own_bi->pubkey, 0); | |
1382 | else | |
1383 | bix = NULL; | |
1384 | if (!auth->peer_bi) | |
1385 | goto fail; | |
1386 | brx = dpp_get_pubkey_point(auth->peer_bi->pubkey, 0); | |
1387 | } else { | |
1388 | pix = dpp_get_pubkey_point(auth->peer_protocol_key, 0); | |
1389 | prx = dpp_get_pubkey_point(auth->own_protocol_key, 0); | |
1390 | if (auth->peer_bi) | |
1391 | bix = dpp_get_pubkey_point(auth->peer_bi->pubkey, 0); | |
1392 | else | |
1393 | bix = NULL; | |
1394 | if (!auth->own_bi) | |
1395 | goto fail; | |
1396 | brx = dpp_get_pubkey_point(auth->own_bi->pubkey, 0); | |
1397 | } | |
1398 | if (!pix || !prx || !brx) | |
1399 | goto fail; | |
1400 | ||
1401 | addr[num_elem] = auth->r_nonce; | |
1402 | len[num_elem] = nonce_len; | |
1403 | num_elem++; | |
1404 | ||
1405 | addr[num_elem] = auth->i_nonce; | |
1406 | len[num_elem] = nonce_len; | |
1407 | num_elem++; | |
1408 | ||
1409 | addr[num_elem] = wpabuf_head(prx); | |
1410 | len[num_elem] = wpabuf_len(prx) / 2; | |
1411 | num_elem++; | |
1412 | ||
1413 | addr[num_elem] = wpabuf_head(pix); | |
1414 | len[num_elem] = wpabuf_len(pix) / 2; | |
1415 | num_elem++; | |
1416 | ||
1417 | addr[num_elem] = wpabuf_head(brx); | |
1418 | len[num_elem] = wpabuf_len(brx) / 2; | |
1419 | num_elem++; | |
1420 | ||
1421 | if (bix) { | |
1422 | addr[num_elem] = wpabuf_head(bix); | |
1423 | len[num_elem] = wpabuf_len(bix) / 2; | |
1424 | num_elem++; | |
1425 | } | |
1426 | ||
1427 | addr[num_elem] = &one; | |
1428 | len[num_elem] = 1; | |
1429 | num_elem++; | |
1430 | ||
1431 | wpa_printf(MSG_DEBUG, "DPP: I-auth hash components"); | |
1432 | for (i = 0; i < num_elem; i++) | |
1433 | wpa_hexdump(MSG_DEBUG, "DPP: hash component", addr[i], len[i]); | |
1434 | if (auth->curve->hash_len == 32) | |
1435 | res = sha256_vector(num_elem, addr, len, i_auth); | |
1436 | else if (auth->curve->hash_len == 48) | |
1437 | res = sha384_vector(num_elem, addr, len, i_auth); | |
1438 | else if (auth->curve->hash_len == 64) | |
1439 | res = sha512_vector(num_elem, addr, len, i_auth); | |
1440 | else | |
1441 | res = -1; | |
1442 | if (res == 0) | |
1443 | wpa_hexdump(MSG_DEBUG, "DPP: I-auth", i_auth, | |
1444 | auth->curve->hash_len); | |
1445 | fail: | |
1446 | wpabuf_free(pix); | |
1447 | wpabuf_free(prx); | |
1448 | wpabuf_free(bix); | |
1449 | wpabuf_free(brx); | |
1450 | return res; | |
1451 | } | |
1452 | ||
1453 | ||
1454 | static int dpp_auth_derive_l_responder(struct dpp_authentication *auth) | |
1455 | { | |
1456 | const EC_GROUP *group; | |
1457 | EC_POINT *l = NULL; | |
1458 | EC_KEY *BI = NULL, *bR = NULL, *pR = NULL; | |
1459 | const EC_POINT *BI_point; | |
1460 | BN_CTX *bnctx; | |
1461 | BIGNUM *lx, *sum, *q; | |
1462 | const BIGNUM *bR_bn, *pR_bn; | |
1463 | int ret = -1; | |
1464 | int num_bytes, offset; | |
1465 | ||
1466 | /* L = ((bR + pR) modulo q) * BI */ | |
1467 | ||
1468 | bnctx = BN_CTX_new(); | |
1469 | sum = BN_new(); | |
1470 | q = BN_new(); | |
1471 | lx = BN_new(); | |
1472 | if (!bnctx || !sum || !q || !lx) | |
1473 | goto fail; | |
1474 | BI = EVP_PKEY_get1_EC_KEY(auth->peer_bi->pubkey); | |
1475 | if (!BI) | |
1476 | goto fail; | |
1477 | BI_point = EC_KEY_get0_public_key(BI); | |
1478 | group = EC_KEY_get0_group(BI); | |
1479 | if (!group) | |
1480 | goto fail; | |
1481 | ||
1482 | bR = EVP_PKEY_get1_EC_KEY(auth->own_bi->pubkey); | |
1483 | pR = EVP_PKEY_get1_EC_KEY(auth->own_protocol_key); | |
1484 | if (!bR || !pR) | |
1485 | goto fail; | |
1486 | bR_bn = EC_KEY_get0_private_key(bR); | |
1487 | pR_bn = EC_KEY_get0_private_key(pR); | |
1488 | if (!bR_bn || !pR_bn) | |
1489 | goto fail; | |
1490 | if (EC_GROUP_get_order(group, q, bnctx) != 1 || | |
1491 | BN_mod_add(sum, bR_bn, pR_bn, q, bnctx) != 1) | |
1492 | goto fail; | |
1493 | l = EC_POINT_new(group); | |
1494 | if (!l || | |
1495 | EC_POINT_mul(group, l, NULL, BI_point, sum, bnctx) != 1 || | |
1496 | EC_POINT_get_affine_coordinates_GFp(group, l, lx, NULL, | |
1497 | bnctx) != 1) { | |
1498 | wpa_printf(MSG_ERROR, | |
1499 | "OpenSSL: failed: %s", | |
1500 | ERR_error_string(ERR_get_error(), NULL)); | |
1501 | goto fail; | |
1502 | } | |
1503 | ||
1504 | num_bytes = BN_num_bytes(lx); | |
1505 | if ((size_t) num_bytes > auth->secret_len) | |
1506 | goto fail; | |
1507 | if (auth->secret_len > (size_t) num_bytes) | |
1508 | offset = auth->secret_len - num_bytes; | |
1509 | else | |
1510 | offset = 0; | |
1511 | ||
1512 | os_memset(auth->Lx, 0, offset); | |
1513 | BN_bn2bin(lx, auth->Lx + offset); | |
1514 | wpa_hexdump_key(MSG_DEBUG, "DPP: L.x", auth->Lx, auth->secret_len); | |
1515 | ret = 0; | |
1516 | fail: | |
1517 | EC_POINT_clear_free(l); | |
1518 | EC_KEY_free(BI); | |
1519 | EC_KEY_free(bR); | |
1520 | EC_KEY_free(pR); | |
1521 | BN_clear_free(lx); | |
1522 | BN_clear_free(sum); | |
1523 | BN_free(q); | |
1524 | BN_CTX_free(bnctx); | |
1525 | return ret; | |
1526 | } | |
1527 | ||
1528 | ||
1529 | static int dpp_auth_derive_l_initiator(struct dpp_authentication *auth) | |
1530 | { | |
1531 | const EC_GROUP *group; | |
1532 | EC_POINT *l = NULL, *sum = NULL; | |
1533 | EC_KEY *bI = NULL, *BR = NULL, *PR = NULL; | |
1534 | const EC_POINT *BR_point, *PR_point; | |
1535 | BN_CTX *bnctx; | |
1536 | BIGNUM *lx; | |
1537 | const BIGNUM *bI_bn; | |
1538 | int ret = -1; | |
1539 | int num_bytes, offset; | |
1540 | ||
1541 | /* L = bI * (BR + PR) */ | |
1542 | ||
1543 | bnctx = BN_CTX_new(); | |
1544 | lx = BN_new(); | |
1545 | if (!bnctx || !lx) | |
1546 | goto fail; | |
1547 | BR = EVP_PKEY_get1_EC_KEY(auth->peer_bi->pubkey); | |
1548 | PR = EVP_PKEY_get1_EC_KEY(auth->peer_protocol_key); | |
1549 | if (!BR || !PR) | |
1550 | goto fail; | |
1551 | BR_point = EC_KEY_get0_public_key(BR); | |
1552 | PR_point = EC_KEY_get0_public_key(PR); | |
1553 | ||
1554 | bI = EVP_PKEY_get1_EC_KEY(auth->own_bi->pubkey); | |
1555 | if (!bI) | |
1556 | goto fail; | |
1557 | group = EC_KEY_get0_group(bI); | |
1558 | bI_bn = EC_KEY_get0_private_key(bI); | |
1559 | if (!group || !bI_bn) | |
1560 | goto fail; | |
1561 | sum = EC_POINT_new(group); | |
1562 | l = EC_POINT_new(group); | |
1563 | if (!sum || !l || | |
1564 | EC_POINT_add(group, sum, BR_point, PR_point, bnctx) != 1 || | |
1565 | EC_POINT_mul(group, l, NULL, sum, bI_bn, bnctx) != 1 || | |
1566 | EC_POINT_get_affine_coordinates_GFp(group, l, lx, NULL, | |
1567 | bnctx) != 1) { | |
1568 | wpa_printf(MSG_ERROR, | |
1569 | "OpenSSL: failed: %s", | |
1570 | ERR_error_string(ERR_get_error(), NULL)); | |
1571 | goto fail; | |
1572 | } | |
1573 | ||
1574 | num_bytes = BN_num_bytes(lx); | |
1575 | if ((size_t) num_bytes > auth->secret_len) | |
1576 | goto fail; | |
1577 | if (auth->secret_len > (size_t) num_bytes) | |
1578 | offset = auth->secret_len - num_bytes; | |
1579 | else | |
1580 | offset = 0; | |
1581 | ||
1582 | os_memset(auth->Lx, 0, offset); | |
1583 | BN_bn2bin(lx, auth->Lx + offset); | |
1584 | wpa_hexdump_key(MSG_DEBUG, "DPP: L.x", auth->Lx, auth->secret_len); | |
1585 | ret = 0; | |
1586 | fail: | |
1587 | EC_POINT_clear_free(l); | |
1588 | EC_KEY_free(bI); | |
1589 | EC_KEY_free(BR); | |
1590 | EC_KEY_free(PR); | |
1591 | BN_clear_free(lx); | |
1592 | BN_CTX_free(bnctx); | |
1593 | return ret; | |
1594 | } | |
1595 | ||
1596 | ||
1597 | static int dpp_auth_build_resp(struct dpp_authentication *auth) | |
1598 | { | |
1599 | size_t nonce_len; | |
1600 | EVP_PKEY_CTX *ctx = NULL; | |
1601 | size_t secret_len; | |
1602 | struct wpabuf *msg, *pr = NULL; | |
1603 | u8 r_auth[4 + DPP_MAX_HASH_LEN]; | |
1604 | u8 wrapped_r_auth[4 + DPP_MAX_HASH_LEN + AES_BLOCK_SIZE]; | |
1605 | #define DPP_AUTH_RESP_CLEAR_LEN 2 * (4 + DPP_MAX_NONCE_LEN) + 4 + 1 + \ | |
1606 | 4 + sizeof(wrapped_r_auth) | |
1607 | size_t wrapped_r_auth_len; | |
1608 | u8 clear[DPP_AUTH_RESP_CLEAR_LEN]; | |
1609 | u8 wrapped_data[DPP_AUTH_RESP_CLEAR_LEN + AES_BLOCK_SIZE]; | |
1610 | u8 *pos; | |
1611 | const u8 *addr[1]; | |
1612 | size_t len[1], siv_len; | |
1613 | ||
1614 | wpa_printf(MSG_DEBUG, "DPP: Build Authentication Response"); | |
1615 | ||
1616 | nonce_len = auth->curve->nonce_len; | |
1617 | if (random_get_bytes(auth->r_nonce, nonce_len)) { | |
1618 | wpa_printf(MSG_ERROR, "DPP: Failed to generate R-nonce"); | |
1619 | goto fail; | |
1620 | } | |
1621 | wpa_hexdump(MSG_DEBUG, "DPP: R-nonce", auth->r_nonce, nonce_len); | |
1622 | ||
1623 | auth->own_protocol_key = dpp_gen_keypair(auth->curve); | |
1624 | if (!auth->own_protocol_key) | |
1625 | goto fail; | |
1626 | ||
1627 | pr = dpp_get_pubkey_point(auth->own_protocol_key, 0); | |
1628 | if (!pr) | |
1629 | goto fail; | |
1630 | ||
1631 | /* ECDH: N = pR * PI */ | |
1632 | ctx = EVP_PKEY_CTX_new(auth->own_protocol_key, NULL); | |
1633 | if (!ctx || | |
1634 | EVP_PKEY_derive_init(ctx) != 1 || | |
1635 | EVP_PKEY_derive_set_peer(ctx, auth->peer_protocol_key) != 1 || | |
1636 | EVP_PKEY_derive(ctx, NULL, &secret_len) != 1 || | |
1637 | secret_len > DPP_MAX_SHARED_SECRET_LEN || | |
1638 | EVP_PKEY_derive(ctx, auth->Nx, &secret_len) != 1) { | |
1639 | wpa_printf(MSG_ERROR, | |
1640 | "DPP: Failed to derive ECDH shared secret: %s", | |
1641 | ERR_error_string(ERR_get_error(), NULL)); | |
1642 | goto fail; | |
1643 | } | |
1644 | EVP_PKEY_CTX_free(ctx); | |
1645 | ctx = NULL; | |
1646 | ||
1647 | wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (N.x)", | |
1648 | auth->Nx, auth->secret_len); | |
1649 | ||
1650 | if (dpp_derive_k2(auth->Nx, auth->secret_len, auth->k2, | |
1651 | auth->curve->hash_len) < 0) | |
1652 | goto fail; | |
1653 | ||
1654 | if (auth->own_bi && auth->peer_bi) { | |
1655 | /* Mutual authentication */ | |
1656 | if (dpp_auth_derive_l_responder(auth) < 0) | |
1657 | goto fail; | |
1658 | } | |
1659 | ||
1660 | if (dpp_derive_ke(auth, auth->ke, auth->curve->hash_len) < 0) | |
1661 | goto fail; | |
1662 | ||
1663 | /* R-auth = H(I-nonce | R-nonce | PI.x | PR.x | [BI.x |] BR.x | 0) */ | |
1664 | WPA_PUT_LE16(r_auth, DPP_ATTR_R_AUTH_TAG); | |
1665 | WPA_PUT_LE16(&r_auth[2], auth->curve->hash_len); | |
1666 | if (dpp_gen_r_auth(auth, r_auth + 4) < 0 || | |
1667 | aes_siv_encrypt(auth->ke, auth->curve->hash_len, | |
1668 | r_auth, 4 + auth->curve->hash_len, | |
1669 | 0, NULL, NULL, wrapped_r_auth) < 0) | |
1670 | goto fail; | |
1671 | wrapped_r_auth_len = 4 + auth->curve->hash_len + AES_BLOCK_SIZE; | |
1672 | wpa_hexdump(MSG_DEBUG, "DPP: {R-auth}ke", | |
1673 | wrapped_r_auth, wrapped_r_auth_len); | |
1674 | ||
1675 | /* Build DPP Authentication Response frame attributes */ | |
1676 | msg = wpabuf_alloc(4 + 1 + 2 * (4 + SHA256_MAC_LEN) + | |
1677 | 4 + wpabuf_len(pr) + 4 + sizeof(wrapped_data)); | |
1678 | if (!msg) | |
1679 | goto fail; | |
1680 | wpabuf_free(auth->resp_attr); | |
1681 | auth->resp_attr = msg; | |
1682 | ||
1683 | /* DPP Status */ | |
1684 | wpabuf_put_le16(msg, DPP_ATTR_STATUS); | |
1685 | wpabuf_put_le16(msg, 1); | |
1686 | wpabuf_put_u8(msg, DPP_STATUS_OK); | |
1687 | ||
1688 | /* Responder Bootstrapping Key Hash */ | |
1689 | wpabuf_put_le16(msg, DPP_ATTR_R_BOOTSTRAP_KEY_HASH); | |
1690 | wpabuf_put_le16(msg, SHA256_MAC_LEN); | |
1691 | wpabuf_put_data(msg, auth->own_bi->pubkey_hash, SHA256_MAC_LEN); | |
1692 | ||
1693 | if (auth->peer_bi) { | |
1694 | /* Mutual authentication */ | |
1695 | /* Initiator Bootstrapping Key Hash */ | |
1696 | wpabuf_put_le16(msg, DPP_ATTR_I_BOOTSTRAP_KEY_HASH); | |
1697 | wpabuf_put_le16(msg, SHA256_MAC_LEN); | |
1698 | wpabuf_put_data(msg, auth->peer_bi->pubkey_hash, | |
1699 | SHA256_MAC_LEN); | |
1700 | } | |
1701 | ||
1702 | /* Responder Protocol Key */ | |
1703 | wpabuf_put_le16(msg, DPP_ATTR_R_PROTOCOL_KEY); | |
1704 | wpabuf_put_le16(msg, wpabuf_len(pr)); | |
1705 | wpabuf_put_buf(msg, pr); | |
1706 | wpabuf_free(pr); | |
1707 | pr = NULL; | |
1708 | ||
1709 | /* Wrapped data ({R-nonce, I-nonce, R-capabilities, {R-auth}ke}k2) */ | |
1710 | pos = clear; | |
1711 | /* R-nonce */ | |
1712 | WPA_PUT_LE16(pos, DPP_ATTR_R_NONCE); | |
1713 | pos += 2; | |
1714 | WPA_PUT_LE16(pos, nonce_len); | |
1715 | pos += 2; | |
1716 | os_memcpy(pos, auth->r_nonce, nonce_len); | |
1717 | pos += nonce_len; | |
1718 | /* I-nonce */ | |
1719 | WPA_PUT_LE16(pos, DPP_ATTR_I_NONCE); | |
1720 | pos += 2; | |
1721 | WPA_PUT_LE16(pos, nonce_len); | |
1722 | pos += 2; | |
1723 | os_memcpy(pos, auth->i_nonce, nonce_len); | |
1724 | pos += nonce_len; | |
1725 | /* R-capabilities */ | |
1726 | WPA_PUT_LE16(pos, DPP_ATTR_R_CAPABILITIES); | |
1727 | pos += 2; | |
1728 | WPA_PUT_LE16(pos, 1); | |
1729 | pos += 2; | |
1730 | auth->r_capab = auth->configurator ? DPP_CAPAB_CONFIGURATOR : | |
1731 | DPP_CAPAB_ENROLLEE; | |
1732 | *pos++ = auth->r_capab; | |
1733 | /* {R-auth}ke */ | |
1734 | WPA_PUT_LE16(pos, DPP_ATTR_WRAPPED_DATA); | |
1735 | pos += 2; | |
1736 | WPA_PUT_LE16(pos, wrapped_r_auth_len); | |
1737 | pos += 2; | |
1738 | os_memcpy(pos, wrapped_r_auth, wrapped_r_auth_len); | |
1739 | pos += wrapped_r_auth_len; | |
1740 | ||
1741 | addr[0] = wpabuf_head(msg); | |
1742 | len[0] = wpabuf_len(msg); | |
1743 | wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD", addr[0], len[0]); | |
1744 | siv_len = pos - clear; | |
1745 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext", clear, siv_len); | |
1746 | if (aes_siv_encrypt(auth->k2, auth->curve->hash_len, clear, siv_len, | |
1747 | 1, addr, len, wrapped_data) < 0) | |
1748 | goto fail; | |
1749 | siv_len += AES_BLOCK_SIZE; | |
1750 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext", | |
1751 | wrapped_data, siv_len); | |
1752 | ||
1753 | wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA); | |
1754 | wpabuf_put_le16(msg, siv_len); | |
1755 | wpabuf_put_data(msg, wrapped_data, siv_len); | |
1756 | ||
1757 | wpa_hexdump_buf(MSG_DEBUG, | |
1758 | "DPP: Authentication Response frame attributes", msg); | |
1759 | ||
1760 | return 0; | |
1761 | ||
1762 | fail: | |
1763 | wpabuf_free(pr); | |
1764 | return -1; | |
1765 | } | |
1766 | ||
1767 | ||
1768 | static int dpp_auth_build_resp_status(struct dpp_authentication *auth, | |
1769 | enum dpp_status_error status) | |
1770 | { | |
1771 | size_t nonce_len; | |
1772 | struct wpabuf *msg; | |
1773 | #define DPP_AUTH_RESP_CLEAR_LEN2 4 + DPP_MAX_NONCE_LEN + 4 + 1 | |
1774 | u8 clear[DPP_AUTH_RESP_CLEAR_LEN2]; | |
1775 | u8 wrapped_data[DPP_AUTH_RESP_CLEAR_LEN2 + AES_BLOCK_SIZE]; | |
1776 | u8 *pos; | |
1777 | const u8 *addr[1]; | |
1778 | size_t len[1], siv_len; | |
1779 | ||
1780 | wpa_printf(MSG_DEBUG, "DPP: Build Authentication Response"); | |
1781 | ||
1782 | /* Build DPP Authentication Response frame attributes */ | |
1783 | msg = wpabuf_alloc(4 + 1 + 2 * (4 + SHA256_MAC_LEN) + | |
1784 | 4 + sizeof(wrapped_data)); | |
1785 | if (!msg) | |
1786 | goto fail; | |
1787 | wpabuf_free(auth->resp_attr); | |
1788 | auth->resp_attr = msg; | |
1789 | ||
1790 | /* DPP Status */ | |
1791 | wpabuf_put_le16(msg, DPP_ATTR_STATUS); | |
1792 | wpabuf_put_le16(msg, 1); | |
1793 | wpabuf_put_u8(msg, status); | |
1794 | ||
1795 | /* Responder Bootstrapping Key Hash */ | |
1796 | wpabuf_put_le16(msg, DPP_ATTR_R_BOOTSTRAP_KEY_HASH); | |
1797 | wpabuf_put_le16(msg, SHA256_MAC_LEN); | |
1798 | wpabuf_put_data(msg, auth->own_bi->pubkey_hash, SHA256_MAC_LEN); | |
1799 | ||
1800 | if (auth->peer_bi) { | |
1801 | /* Mutual authentication */ | |
1802 | /* Initiator Bootstrapping Key Hash */ | |
1803 | wpabuf_put_le16(msg, DPP_ATTR_I_BOOTSTRAP_KEY_HASH); | |
1804 | wpabuf_put_le16(msg, SHA256_MAC_LEN); | |
1805 | wpabuf_put_data(msg, auth->peer_bi->pubkey_hash, | |
1806 | SHA256_MAC_LEN); | |
1807 | } | |
1808 | ||
1809 | /* Wrapped data ({I-nonce, R-capabilities}k1) */ | |
1810 | pos = clear; | |
1811 | /* I-nonce */ | |
1812 | nonce_len = auth->curve->nonce_len; | |
1813 | WPA_PUT_LE16(pos, DPP_ATTR_I_NONCE); | |
1814 | pos += 2; | |
1815 | WPA_PUT_LE16(pos, nonce_len); | |
1816 | pos += 2; | |
1817 | os_memcpy(pos, auth->i_nonce, nonce_len); | |
1818 | pos += nonce_len; | |
1819 | /* R-capabilities */ | |
1820 | WPA_PUT_LE16(pos, DPP_ATTR_R_CAPABILITIES); | |
1821 | pos += 2; | |
1822 | WPA_PUT_LE16(pos, 1); | |
1823 | pos += 2; | |
1824 | auth->r_capab = auth->configurator ? DPP_CAPAB_CONFIGURATOR : | |
1825 | DPP_CAPAB_ENROLLEE; | |
1826 | *pos++ = auth->r_capab; | |
1827 | ||
1828 | addr[0] = wpabuf_head(msg); | |
1829 | len[0] = wpabuf_len(msg); | |
1830 | wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD", addr[0], len[0]); | |
1831 | siv_len = pos - clear; | |
1832 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext", clear, siv_len); | |
1833 | if (aes_siv_encrypt(auth->k1, auth->curve->hash_len, clear, siv_len, | |
1834 | 1, addr, len, wrapped_data) < 0) | |
1835 | goto fail; | |
1836 | siv_len += AES_BLOCK_SIZE; | |
1837 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext", | |
1838 | wrapped_data, siv_len); | |
1839 | ||
1840 | wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA); | |
1841 | wpabuf_put_le16(msg, siv_len); | |
1842 | wpabuf_put_data(msg, wrapped_data, siv_len); | |
1843 | ||
1844 | wpa_hexdump_buf(MSG_DEBUG, | |
1845 | "DPP: Authentication Response frame attributes", msg); | |
1846 | ||
1847 | return 0; | |
1848 | ||
1849 | fail: | |
1850 | return -1; | |
1851 | } | |
1852 | ||
1853 | ||
1854 | struct dpp_authentication * | |
1855 | dpp_auth_req_rx(void *msg_ctx, u8 dpp_allowed_roles, int qr_mutual, | |
1856 | struct dpp_bootstrap_info *peer_bi, | |
1857 | struct dpp_bootstrap_info *own_bi, | |
1858 | unsigned int freq, const u8 *attr_start, | |
1859 | const u8 *wrapped_data, u16 wrapped_data_len) | |
1860 | { | |
1861 | EVP_PKEY *pi = NULL; | |
1862 | EVP_PKEY_CTX *ctx = NULL; | |
1863 | size_t secret_len; | |
1864 | const u8 *addr[1]; | |
1865 | size_t len[1]; | |
1866 | u8 *unwrapped = NULL; | |
1867 | size_t unwrapped_len = 0; | |
1868 | const u8 *i_proto, *i_nonce, *i_capab, *i_bootstrap; | |
1869 | u16 i_proto_len, i_nonce_len, i_capab_len, i_bootstrap_len; | |
1870 | struct dpp_authentication *auth = NULL; | |
1871 | size_t attr_len; | |
1872 | ||
1873 | if (wrapped_data_len < AES_BLOCK_SIZE) | |
1874 | return NULL; | |
1875 | ||
1876 | attr_len = wrapped_data - 4 - attr_start; | |
1877 | ||
1878 | auth = os_zalloc(sizeof(*auth)); | |
1879 | if (!auth) | |
1880 | goto fail; | |
1881 | auth->msg_ctx = msg_ctx; | |
1882 | auth->peer_bi = peer_bi; | |
1883 | auth->own_bi = own_bi; | |
1884 | auth->curve = own_bi->curve; | |
1885 | auth->curr_freq = freq; | |
1886 | ||
1887 | i_proto = dpp_get_attr(attr_start, attr_len, DPP_ATTR_I_PROTOCOL_KEY, | |
1888 | &i_proto_len); | |
1889 | if (!i_proto) { | |
1890 | wpa_printf(MSG_DEBUG, | |
1891 | "DPP: Missing required Initiator Protocol Key attribute"); | |
1892 | goto fail; | |
1893 | } | |
1894 | wpa_hexdump(MSG_MSGDUMP, "DPP: Initiator Protocol Key", | |
1895 | i_proto, i_proto_len); | |
1896 | ||
1897 | /* M = bR * PI */ | |
1898 | pi = dpp_set_pubkey_point(own_bi->pubkey, i_proto, i_proto_len); | |
1899 | if (!pi) { | |
1900 | wpa_printf(MSG_DEBUG, "DPP: Invalid Initiator Protocol Key"); | |
1901 | goto fail; | |
1902 | } | |
1903 | dpp_debug_print_key("Peer (Initiator) Protocol Key", pi); | |
1904 | ||
1905 | ctx = EVP_PKEY_CTX_new(own_bi->pubkey, NULL); | |
1906 | if (!ctx || | |
1907 | EVP_PKEY_derive_init(ctx) != 1 || | |
1908 | EVP_PKEY_derive_set_peer(ctx, pi) != 1 || | |
1909 | EVP_PKEY_derive(ctx, NULL, &secret_len) != 1 || | |
1910 | secret_len > DPP_MAX_SHARED_SECRET_LEN || | |
1911 | EVP_PKEY_derive(ctx, auth->Mx, &secret_len) != 1) { | |
1912 | wpa_printf(MSG_ERROR, | |
1913 | "DPP: Failed to derive ECDH shared secret: %s", | |
1914 | ERR_error_string(ERR_get_error(), NULL)); | |
1915 | goto fail; | |
1916 | } | |
1917 | auth->secret_len = secret_len; | |
1918 | EVP_PKEY_CTX_free(ctx); | |
1919 | ctx = NULL; | |
1920 | ||
1921 | wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (M.x)", | |
1922 | auth->Mx, auth->secret_len); | |
1923 | ||
1924 | if (dpp_derive_k1(auth->Mx, auth->secret_len, auth->k1, | |
1925 | auth->curve->hash_len) < 0) | |
1926 | goto fail; | |
1927 | ||
1928 | addr[0] = attr_start; | |
1929 | len[0] = attr_len; | |
1930 | wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD", addr[0], len[0]); | |
1931 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext", | |
1932 | wrapped_data, wrapped_data_len); | |
1933 | unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE; | |
1934 | unwrapped = os_malloc(unwrapped_len); | |
1935 | if (!unwrapped) | |
1936 | goto fail; | |
1937 | if (aes_siv_decrypt(auth->k1, auth->curve->hash_len, | |
1938 | wrapped_data, wrapped_data_len, | |
1939 | 1, addr, len, unwrapped) < 0) { | |
1940 | wpa_printf(MSG_DEBUG, "DPP: AES-SIV decryption failed"); | |
1941 | goto fail; | |
1942 | } | |
1943 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext", | |
1944 | unwrapped, unwrapped_len); | |
1945 | ||
1946 | if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) { | |
1947 | wpa_printf(MSG_DEBUG, | |
1948 | "DPP: Invalid attribute in unwrapped data"); | |
1949 | goto fail; | |
1950 | } | |
1951 | ||
1952 | i_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_I_NONCE, | |
1953 | &i_nonce_len); | |
1954 | if (!i_nonce || i_nonce_len != auth->curve->nonce_len) { | |
1955 | wpa_printf(MSG_DEBUG, "DPP: Missing or invalid I-nonce"); | |
1956 | goto fail; | |
1957 | } | |
1958 | wpa_hexdump(MSG_DEBUG, "DPP: I-nonce", i_nonce, i_nonce_len); | |
1959 | os_memcpy(auth->i_nonce, i_nonce, i_nonce_len); | |
1960 | ||
1961 | i_capab = dpp_get_attr(unwrapped, unwrapped_len, | |
1962 | DPP_ATTR_I_CAPABILITIES, | |
1963 | &i_capab_len); | |
1964 | if (!i_capab || i_capab_len < 1) { | |
1965 | wpa_printf(MSG_DEBUG, "DPP: Missing or invalid I-capabilities"); | |
1966 | goto fail; | |
1967 | } | |
1968 | auth->i_capab = i_capab[0]; | |
1969 | wpa_printf(MSG_DEBUG, "DPP: I-capabilities: 0x%02x", auth->i_capab); | |
1970 | ||
1971 | bin_clear_free(unwrapped, unwrapped_len); | |
1972 | unwrapped = NULL; | |
1973 | ||
1974 | switch (auth->i_capab & DPP_CAPAB_ROLE_MASK) { | |
1975 | case DPP_CAPAB_ENROLLEE: | |
1976 | if (!(dpp_allowed_roles & DPP_CAPAB_CONFIGURATOR)) { | |
1977 | wpa_printf(MSG_DEBUG, | |
1978 | "DPP: Local policy does not allow Configurator role"); | |
1979 | goto not_compatible; | |
1980 | } | |
1981 | wpa_printf(MSG_DEBUG, "DPP: Acting as Configurator"); | |
1982 | auth->configurator = 1; | |
1983 | break; | |
1984 | case DPP_CAPAB_CONFIGURATOR: | |
1985 | if (!(dpp_allowed_roles & DPP_CAPAB_ENROLLEE)) { | |
1986 | wpa_printf(MSG_DEBUG, | |
1987 | "DPP: Local policy does not allow Enrollee role"); | |
1988 | goto not_compatible; | |
1989 | } | |
1990 | wpa_printf(MSG_DEBUG, "DPP: Acting as Enrollee"); | |
1991 | auth->configurator = 0; | |
1992 | break; | |
1993 | default: | |
1994 | wpa_printf(MSG_DEBUG, "DPP: Unexpected role in I-capabilities"); | |
1995 | goto not_compatible; | |
1996 | } | |
1997 | ||
1998 | auth->peer_protocol_key = pi; | |
1999 | pi = NULL; | |
2000 | if (qr_mutual && !peer_bi && own_bi->type == DPP_BOOTSTRAP_QR_CODE) { | |
2001 | char hex[SHA256_MAC_LEN * 2 + 1]; | |
2002 | ||
2003 | wpa_printf(MSG_DEBUG, | |
2004 | "DPP: Mutual authentication required with QR Codes, but peer info is not yet available - request more time"); | |
2005 | if (dpp_auth_build_resp_status(auth, | |
2006 | DPP_STATUS_RESPONSE_PENDING) < 0) | |
2007 | goto fail; | |
2008 | i_bootstrap = dpp_get_attr(attr_start, attr_len, | |
2009 | DPP_ATTR_I_BOOTSTRAP_KEY_HASH, | |
2010 | &i_bootstrap_len); | |
2011 | if (i_bootstrap && i_bootstrap_len == SHA256_MAC_LEN) { | |
2012 | auth->response_pending = 1; | |
2013 | os_memcpy(auth->waiting_pubkey_hash, | |
2014 | i_bootstrap, i_bootstrap_len); | |
2015 | wpa_snprintf_hex(hex, sizeof(hex), i_bootstrap, | |
2016 | i_bootstrap_len); | |
2017 | } else { | |
2018 | hex[0] = '\0'; | |
2019 | } | |
2020 | ||
2021 | wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_SCAN_PEER_QR_CODE | |
2022 | "%s", hex); | |
2023 | return auth; | |
2024 | } | |
2025 | if (dpp_auth_build_resp(auth) < 0) | |
2026 | goto fail; | |
2027 | ||
2028 | return auth; | |
2029 | ||
2030 | not_compatible: | |
2031 | wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_NOT_COMPATIBLE | |
2032 | "i-capab=0x%02x", auth->i_capab); | |
2033 | if (dpp_allowed_roles & DPP_CAPAB_CONFIGURATOR) | |
2034 | auth->configurator = 1; | |
2035 | else | |
2036 | auth->configurator = 0; | |
2037 | auth->peer_protocol_key = pi; | |
2038 | pi = NULL; | |
2039 | if (dpp_auth_build_resp_status(auth, DPP_STATUS_NOT_COMPATIBLE) < 0) | |
2040 | goto fail; | |
2041 | ||
2042 | auth->remove_on_tx_status = 1; | |
2043 | return auth; | |
2044 | fail: | |
2045 | bin_clear_free(unwrapped, unwrapped_len); | |
2046 | EVP_PKEY_free(pi); | |
2047 | EVP_PKEY_CTX_free(ctx); | |
2048 | dpp_auth_deinit(auth); | |
2049 | return NULL; | |
2050 | } | |
2051 | ||
2052 | ||
2053 | int dpp_notify_new_qr_code(struct dpp_authentication *auth, | |
2054 | struct dpp_bootstrap_info *peer_bi) | |
2055 | { | |
2056 | if (!auth || !auth->response_pending || | |
2057 | os_memcmp(auth->waiting_pubkey_hash, peer_bi->pubkey_hash, | |
2058 | SHA256_MAC_LEN) != 0) | |
2059 | return 0; | |
2060 | ||
2061 | wpa_printf(MSG_DEBUG, | |
2062 | "DPP: New scanned QR Code has matching public key that was needed to continue DPP Authentication exchange with " | |
2063 | MACSTR, MAC2STR(auth->peer_mac_addr)); | |
2064 | auth->peer_bi = peer_bi; | |
2065 | ||
2066 | if (dpp_auth_build_resp(auth) < 0) | |
2067 | return -1; | |
2068 | ||
2069 | return 1; | |
2070 | } | |
2071 | ||
2072 | ||
2073 | static struct wpabuf * dpp_auth_build_conf(struct dpp_authentication *auth) | |
2074 | { | |
2075 | struct wpabuf *msg; | |
2076 | u8 i_auth[4 + DPP_MAX_HASH_LEN]; | |
2077 | size_t i_auth_len; | |
2078 | const u8 *addr[1]; | |
2079 | size_t len[1]; | |
2080 | u8 *wrapped_i_auth; | |
2081 | ||
2082 | wpa_printf(MSG_DEBUG, "DPP: Build Authentication Confirmation"); | |
2083 | ||
2084 | i_auth_len = 4 + auth->curve->hash_len; | |
2085 | /* Build DPP Authentication Confirmation frame attributes */ | |
2086 | msg = wpabuf_alloc(4 + 1 + 2 * (4 + SHA256_MAC_LEN) + | |
2087 | 4 + i_auth_len + AES_BLOCK_SIZE); | |
2088 | if (!msg) | |
2089 | goto fail; | |
2090 | ||
2091 | /* DPP Status */ | |
2092 | wpabuf_put_le16(msg, DPP_ATTR_STATUS); | |
2093 | wpabuf_put_le16(msg, 1); | |
2094 | wpabuf_put_u8(msg, DPP_STATUS_OK); | |
2095 | ||
2096 | /* Responder Bootstrapping Key Hash */ | |
2097 | wpabuf_put_le16(msg, DPP_ATTR_R_BOOTSTRAP_KEY_HASH); | |
2098 | wpabuf_put_le16(msg, SHA256_MAC_LEN); | |
2099 | wpabuf_put_data(msg, auth->peer_bi->pubkey_hash, SHA256_MAC_LEN); | |
2100 | ||
2101 | if (auth->own_bi) { | |
2102 | /* Mutual authentication */ | |
2103 | /* Initiator Bootstrapping Key Hash */ | |
2104 | wpabuf_put_le16(msg, DPP_ATTR_I_BOOTSTRAP_KEY_HASH); | |
2105 | wpabuf_put_le16(msg, SHA256_MAC_LEN); | |
2106 | wpabuf_put_data(msg, auth->own_bi->pubkey_hash, SHA256_MAC_LEN); | |
2107 | } | |
2108 | ||
2109 | addr[0] = wpabuf_head(msg); | |
2110 | len[0] = wpabuf_len(msg); | |
2111 | wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA); | |
2112 | wpabuf_put_le16(msg, i_auth_len + AES_BLOCK_SIZE); | |
2113 | wrapped_i_auth = wpabuf_put(msg, i_auth_len + AES_BLOCK_SIZE); | |
2114 | /* I-auth = H(R-nonce | I-nonce | PR.x | PI.x | BR.x | [BI.x |] 1) */ | |
2115 | WPA_PUT_LE16(i_auth, DPP_ATTR_I_AUTH_TAG); | |
2116 | WPA_PUT_LE16(&i_auth[2], auth->curve->hash_len); | |
2117 | if (dpp_gen_i_auth(auth, i_auth + 4) < 0 || | |
2118 | aes_siv_encrypt(auth->ke, auth->curve->hash_len, | |
2119 | i_auth, i_auth_len, | |
2120 | 1, addr, len, wrapped_i_auth) < 0) | |
2121 | goto fail; | |
2122 | wpa_hexdump(MSG_DEBUG, "DPP: {I-auth}ke", | |
2123 | wrapped_i_auth, i_auth_len + AES_BLOCK_SIZE); | |
2124 | ||
2125 | wpa_hexdump_buf(MSG_DEBUG, | |
2126 | "DPP: Authentication Confirmation frame attributes", | |
2127 | msg); | |
2128 | dpp_auth_success(auth); | |
2129 | ||
2130 | return msg; | |
2131 | ||
2132 | fail: | |
2133 | return NULL; | |
2134 | } | |
2135 | ||
2136 | ||
2137 | static void | |
2138 | dpp_auth_resp_rx_status(struct dpp_authentication *auth, | |
2139 | const u8 *attr_start, size_t attr_len, | |
2140 | const u8 *wrapped_data, u16 wrapped_data_len, | |
2141 | enum dpp_status_error status) | |
2142 | { | |
2143 | const u8 *addr[1]; | |
2144 | size_t len[1]; | |
2145 | u8 *unwrapped = NULL; | |
2146 | size_t unwrapped_len = 0; | |
2147 | const u8 *i_nonce, *r_capab; | |
2148 | u16 i_nonce_len, r_capab_len; | |
2149 | ||
2150 | if (status == DPP_STATUS_NOT_COMPATIBLE) { | |
2151 | wpa_printf(MSG_DEBUG, | |
2152 | "DPP: Responder reported incompatible roles"); | |
2153 | } else if (status == DPP_STATUS_RESPONSE_PENDING) { | |
2154 | wpa_printf(MSG_DEBUG, | |
2155 | "DPP: Responder reported more time needed"); | |
2156 | } else { | |
2157 | wpa_printf(MSG_DEBUG, | |
2158 | "DPP: Responder reported failure (status %d)", | |
2159 | status); | |
2160 | return; | |
2161 | } | |
2162 | ||
2163 | addr[0] = attr_start; | |
2164 | len[0] = attr_len; | |
2165 | wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD", addr[0], len[0]); | |
2166 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext", | |
2167 | wrapped_data, wrapped_data_len); | |
2168 | unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE; | |
2169 | unwrapped = os_malloc(unwrapped_len); | |
2170 | if (!unwrapped) | |
2171 | goto fail; | |
2172 | if (aes_siv_decrypt(auth->k1, auth->curve->hash_len, | |
2173 | wrapped_data, wrapped_data_len, | |
2174 | 1, addr, len, unwrapped) < 0) { | |
2175 | wpa_printf(MSG_DEBUG, "DPP: AES-SIV decryption failed"); | |
2176 | goto fail; | |
2177 | } | |
2178 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext", | |
2179 | unwrapped, unwrapped_len); | |
2180 | ||
2181 | if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) { | |
2182 | wpa_printf(MSG_DEBUG, | |
2183 | "DPP: Invalid attribute in unwrapped data"); | |
2184 | goto fail; | |
2185 | } | |
2186 | ||
2187 | i_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_I_NONCE, | |
2188 | &i_nonce_len); | |
2189 | if (!i_nonce || i_nonce_len != auth->curve->nonce_len) { | |
2190 | wpa_printf(MSG_DEBUG, "DPP: Missing or invalid I-nonce"); | |
2191 | goto fail; | |
2192 | } | |
2193 | wpa_hexdump(MSG_DEBUG, "DPP: I-nonce", i_nonce, i_nonce_len); | |
2194 | if (os_memcmp(auth->i_nonce, i_nonce, i_nonce_len) != 0) { | |
2195 | wpa_printf(MSG_DEBUG, "DPP: I-nonce mismatch"); | |
2196 | goto fail; | |
2197 | } | |
2198 | ||
2199 | r_capab = dpp_get_attr(unwrapped, unwrapped_len, | |
2200 | DPP_ATTR_R_CAPABILITIES, | |
2201 | &r_capab_len); | |
2202 | if (!r_capab || r_capab_len < 1) { | |
2203 | wpa_printf(MSG_DEBUG, "DPP: Missing or invalid R-capabilities"); | |
2204 | goto fail; | |
2205 | } | |
2206 | auth->r_capab = r_capab[0]; | |
2207 | wpa_printf(MSG_DEBUG, "DPP: R-capabilities: 0x%02x", auth->r_capab); | |
2208 | if (status == DPP_STATUS_NOT_COMPATIBLE) { | |
2209 | wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_NOT_COMPATIBLE | |
2210 | "r-capab=0x%02x", auth->r_capab); | |
2211 | } else if (status == DPP_STATUS_RESPONSE_PENDING) { | |
2212 | wpa_printf(MSG_DEBUG, | |
2213 | "DPP: Continue waiting for full DPP Authentication Response"); | |
2214 | wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_RESPONSE_PENDING); | |
2215 | } | |
2216 | fail: | |
2217 | bin_clear_free(unwrapped, unwrapped_len); | |
2218 | } | |
2219 | ||
2220 | ||
2221 | struct wpabuf * | |
2222 | dpp_auth_resp_rx(struct dpp_authentication *auth, const u8 *attr_start, | |
2223 | size_t attr_len) | |
2224 | { | |
2225 | EVP_PKEY *pr; | |
2226 | EVP_PKEY_CTX *ctx = NULL; | |
2227 | size_t secret_len; | |
2228 | const u8 *addr[1]; | |
2229 | size_t len[1]; | |
2230 | u8 *unwrapped = NULL, *unwrapped2 = NULL; | |
2231 | size_t unwrapped_len = 0, unwrapped2_len = 0; | |
2232 | const u8 *r_bootstrap, *i_bootstrap, *wrapped_data, *status, *r_proto, | |
2233 | *r_nonce, *i_nonce, *r_capab, *wrapped2, *r_auth; | |
2234 | u16 r_bootstrap_len, i_bootstrap_len, wrapped_data_len, status_len, | |
2235 | r_proto_len, r_nonce_len, i_nonce_len, r_capab_len, | |
2236 | wrapped2_len, r_auth_len; | |
2237 | u8 r_auth2[DPP_MAX_HASH_LEN]; | |
2238 | ||
2239 | wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA, | |
2240 | &wrapped_data_len); | |
2241 | if (!wrapped_data) { | |
2242 | wpa_printf(MSG_DEBUG, | |
2243 | "DPP: Missing required Wrapped data attribute"); | |
2244 | return NULL; | |
2245 | } | |
2246 | wpa_hexdump(MSG_DEBUG, "DPP: Wrapped data", | |
2247 | wrapped_data, wrapped_data_len); | |
2248 | ||
2249 | if (wrapped_data_len < AES_BLOCK_SIZE) | |
2250 | return NULL; | |
2251 | ||
2252 | attr_len = wrapped_data - 4 - attr_start; | |
2253 | ||
2254 | r_bootstrap = dpp_get_attr(attr_start, attr_len, | |
2255 | DPP_ATTR_R_BOOTSTRAP_KEY_HASH, | |
2256 | &r_bootstrap_len); | |
2257 | if (!r_bootstrap || r_bootstrap_len != SHA256_MAC_LEN) { | |
2258 | wpa_printf(MSG_DEBUG, | |
2259 | "DPP: Missing or invalid required Responder Bootstrapping Key Hash attribute"); | |
2260 | return NULL; | |
2261 | } | |
2262 | wpa_hexdump(MSG_DEBUG, "DPP: Responder Bootstrapping Key Hash", | |
2263 | r_bootstrap, r_bootstrap_len); | |
2264 | if (os_memcmp(r_bootstrap, auth->peer_bi->pubkey_hash, | |
2265 | SHA256_MAC_LEN) != 0) { | |
2266 | wpa_hexdump(MSG_DEBUG, | |
2267 | "DPP: Expected Responder Bootstrapping Key Hash", | |
2268 | auth->peer_bi->pubkey_hash, SHA256_MAC_LEN); | |
2269 | return NULL; | |
2270 | } | |
2271 | ||
2272 | i_bootstrap = dpp_get_attr(attr_start, attr_len, | |
2273 | DPP_ATTR_I_BOOTSTRAP_KEY_HASH, | |
2274 | &i_bootstrap_len); | |
2275 | if (i_bootstrap) { | |
2276 | if (i_bootstrap_len != SHA256_MAC_LEN) { | |
2277 | wpa_printf(MSG_DEBUG, | |
2278 | "DPP: Invalid Initiator Bootstrapping Key Hash attribute"); | |
2279 | return NULL; | |
2280 | } | |
2281 | wpa_hexdump(MSG_MSGDUMP, | |
2282 | "DPP: Initiator Bootstrapping Key Hash", | |
2283 | i_bootstrap, i_bootstrap_len); | |
2284 | if (!auth->own_bi || | |
2285 | os_memcmp(i_bootstrap, auth->own_bi->pubkey_hash, | |
2286 | SHA256_MAC_LEN) != 0) { | |
2287 | wpa_printf(MSG_DEBUG, | |
2288 | "DPP: Initiator Bootstrapping Key Hash attribute did not match"); | |
2289 | return NULL; | |
2290 | } | |
2291 | } | |
2292 | ||
2293 | status = dpp_get_attr(attr_start, attr_len, DPP_ATTR_STATUS, | |
2294 | &status_len); | |
2295 | if (!status || status_len < 1) { | |
2296 | wpa_printf(MSG_DEBUG, | |
2297 | "DPP: Missing or invalid required DPP Status attribute"); | |
2298 | return NULL; | |
2299 | } | |
2300 | wpa_printf(MSG_DEBUG, "DPP: Status %u", status[0]); | |
2301 | auth->auth_resp_status = status[0]; | |
2302 | if (status[0] != DPP_STATUS_OK) { | |
2303 | dpp_auth_resp_rx_status(auth, attr_start, | |
2304 | attr_len, wrapped_data, | |
2305 | wrapped_data_len, status[0]); | |
2306 | return NULL; | |
2307 | } | |
2308 | ||
2309 | r_proto = dpp_get_attr(attr_start, attr_len, DPP_ATTR_R_PROTOCOL_KEY, | |
2310 | &r_proto_len); | |
2311 | if (!r_proto) { | |
2312 | wpa_printf(MSG_DEBUG, | |
2313 | "DPP: Missing required Responder Protocol Key attribute"); | |
2314 | return NULL; | |
2315 | } | |
2316 | wpa_hexdump(MSG_MSGDUMP, "DPP: Responder Protocol Key", | |
2317 | r_proto, r_proto_len); | |
2318 | ||
2319 | /* N = pI * PR */ | |
2320 | pr = dpp_set_pubkey_point(auth->own_protocol_key, r_proto, r_proto_len); | |
2321 | if (!pr) { | |
2322 | wpa_printf(MSG_DEBUG, "DPP: Invalid Responder Protocol Key"); | |
2323 | return NULL; | |
2324 | } | |
2325 | dpp_debug_print_key("Peer (Responder) Protocol Key", pr); | |
2326 | ||
2327 | ctx = EVP_PKEY_CTX_new(auth->own_protocol_key, NULL); | |
2328 | if (!ctx || | |
2329 | EVP_PKEY_derive_init(ctx) != 1 || | |
2330 | EVP_PKEY_derive_set_peer(ctx, pr) != 1 || | |
2331 | EVP_PKEY_derive(ctx, NULL, &secret_len) != 1 || | |
2332 | secret_len > DPP_MAX_SHARED_SECRET_LEN || | |
2333 | EVP_PKEY_derive(ctx, auth->Nx, &secret_len) != 1) { | |
2334 | wpa_printf(MSG_ERROR, | |
2335 | "DPP: Failed to derive ECDH shared secret: %s", | |
2336 | ERR_error_string(ERR_get_error(), NULL)); | |
2337 | goto fail; | |
2338 | } | |
2339 | EVP_PKEY_CTX_free(ctx); | |
2340 | ctx = NULL; | |
2341 | auth->peer_protocol_key = pr; | |
2342 | pr = NULL; | |
2343 | ||
2344 | wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (N.x)", | |
2345 | auth->Nx, auth->secret_len); | |
2346 | ||
2347 | if (dpp_derive_k2(auth->Nx, auth->secret_len, auth->k2, | |
2348 | auth->curve->hash_len) < 0) | |
2349 | goto fail; | |
2350 | ||
2351 | addr[0] = attr_start; | |
2352 | len[0] = attr_len; | |
2353 | wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD", addr[0], len[0]); | |
2354 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext", | |
2355 | wrapped_data, wrapped_data_len); | |
2356 | unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE; | |
2357 | unwrapped = os_malloc(unwrapped_len); | |
2358 | if (!unwrapped) | |
2359 | goto fail; | |
2360 | if (aes_siv_decrypt(auth->k2, auth->curve->hash_len, | |
2361 | wrapped_data, wrapped_data_len, | |
2362 | 1, addr, len, unwrapped) < 0) { | |
2363 | wpa_printf(MSG_DEBUG, "DPP: AES-SIV decryption failed"); | |
2364 | goto fail; | |
2365 | } | |
2366 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext", | |
2367 | unwrapped, unwrapped_len); | |
2368 | ||
2369 | if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) { | |
2370 | wpa_printf(MSG_DEBUG, | |
2371 | "DPP: Invalid attribute in unwrapped data"); | |
2372 | goto fail; | |
2373 | } | |
2374 | ||
2375 | r_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_R_NONCE, | |
2376 | &r_nonce_len); | |
2377 | if (!r_nonce || r_nonce_len != auth->curve->nonce_len) { | |
2378 | wpa_printf(MSG_DEBUG, "DPP: Missing or invalid R-nonce"); | |
2379 | goto fail; | |
2380 | } | |
2381 | wpa_hexdump(MSG_DEBUG, "DPP: R-nonce", r_nonce, r_nonce_len); | |
2382 | os_memcpy(auth->r_nonce, r_nonce, r_nonce_len); | |
2383 | ||
2384 | i_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_I_NONCE, | |
2385 | &i_nonce_len); | |
2386 | if (!i_nonce || i_nonce_len != auth->curve->nonce_len) { | |
2387 | wpa_printf(MSG_DEBUG, "DPP: Missing or invalid I-nonce"); | |
2388 | goto fail; | |
2389 | } | |
2390 | wpa_hexdump(MSG_DEBUG, "DPP: I-nonce", i_nonce, i_nonce_len); | |
2391 | if (os_memcmp(auth->i_nonce, i_nonce, i_nonce_len) != 0) { | |
2392 | wpa_printf(MSG_DEBUG, "DPP: I-nonce mismatch"); | |
2393 | goto fail; | |
2394 | } | |
2395 | ||
2396 | if (auth->own_bi && auth->peer_bi) { | |
2397 | /* Mutual authentication */ | |
2398 | if (dpp_auth_derive_l_initiator(auth) < 0) | |
2399 | goto fail; | |
2400 | } | |
2401 | ||
2402 | if (dpp_derive_ke(auth, auth->ke, auth->curve->hash_len) < 0) | |
2403 | goto fail; | |
2404 | ||
2405 | r_capab = dpp_get_attr(unwrapped, unwrapped_len, | |
2406 | DPP_ATTR_R_CAPABILITIES, | |
2407 | &r_capab_len); | |
2408 | if (!r_capab || r_capab_len < 1) { | |
2409 | wpa_printf(MSG_DEBUG, "DPP: Missing or invalid R-capabilities"); | |
2410 | goto fail; | |
2411 | } | |
2412 | auth->r_capab = r_capab[0]; | |
2413 | wpa_printf(MSG_DEBUG, "DPP: R-capabilities: 0x%02x", auth->r_capab); | |
2414 | if ((auth->configurator && (auth->r_capab & DPP_CAPAB_CONFIGURATOR)) || | |
2415 | (!auth->configurator && (auth->r_capab & DPP_CAPAB_ENROLLEE))) { | |
2416 | wpa_printf(MSG_DEBUG, "DPP: Incompatible role selection"); | |
2417 | goto fail; | |
2418 | } | |
2419 | ||
2420 | wrapped2 = dpp_get_attr(unwrapped, unwrapped_len, | |
2421 | DPP_ATTR_WRAPPED_DATA, &wrapped2_len); | |
2422 | if (!wrapped2 || wrapped2_len < AES_BLOCK_SIZE) { | |
2423 | wpa_printf(MSG_DEBUG, | |
2424 | "DPP: Missing or invalid Secondary Wrapped Data"); | |
2425 | goto fail; | |
2426 | } | |
2427 | ||
2428 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext", | |
2429 | wrapped2, wrapped2_len); | |
2430 | unwrapped2_len = wrapped2_len - AES_BLOCK_SIZE; | |
2431 | unwrapped2 = os_malloc(unwrapped2_len); | |
2432 | if (!unwrapped2) | |
2433 | goto fail; | |
2434 | if (aes_siv_decrypt(auth->ke, auth->curve->hash_len, | |
2435 | wrapped2, wrapped2_len, | |
2436 | 0, NULL, NULL, unwrapped2) < 0) { | |
2437 | wpa_printf(MSG_DEBUG, "DPP: AES-SIV decryption failed"); | |
2438 | goto fail; | |
2439 | } | |
2440 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext", | |
2441 | unwrapped2, unwrapped2_len); | |
2442 | ||
2443 | if (dpp_check_attrs(unwrapped2, unwrapped2_len) < 0) { | |
2444 | wpa_printf(MSG_DEBUG, | |
2445 | "DPP: Invalid attribute in secondary unwrapped data"); | |
2446 | goto fail; | |
2447 | } | |
2448 | ||
2449 | r_auth = dpp_get_attr(unwrapped2, unwrapped2_len, DPP_ATTR_R_AUTH_TAG, | |
2450 | &r_auth_len); | |
2451 | if (!r_auth || r_auth_len != auth->curve->hash_len) { | |
2452 | wpa_printf(MSG_DEBUG, | |
2453 | "DPP: Missing or invalid Responder Authenticating Tag"); | |
2454 | goto fail; | |
2455 | } | |
2456 | wpa_hexdump(MSG_DEBUG, "DPP: Received Responder Authenticating Tag", | |
2457 | r_auth, r_auth_len); | |
2458 | /* R-auth' = H(I-nonce | R-nonce | PI.x | PR.x | [BI.x |] BR.x | 0) */ | |
2459 | if (dpp_gen_r_auth(auth, r_auth2) < 0) | |
2460 | goto fail; | |
2461 | wpa_hexdump(MSG_DEBUG, "DPP: Calculated Responder Authenticating Tag", | |
2462 | r_auth2, r_auth_len); | |
2463 | if (os_memcmp(r_auth, r_auth2, r_auth_len) != 0) { | |
2464 | wpa_printf(MSG_DEBUG, | |
2465 | "DPP: Mismatching Responder Authenticating Tag"); | |
2466 | goto fail; | |
2467 | } | |
2468 | ||
2469 | bin_clear_free(unwrapped, unwrapped_len); | |
2470 | bin_clear_free(unwrapped2, unwrapped2_len); | |
2471 | ||
2472 | return dpp_auth_build_conf(auth); | |
2473 | ||
2474 | fail: | |
2475 | bin_clear_free(unwrapped, unwrapped_len); | |
2476 | bin_clear_free(unwrapped2, unwrapped2_len); | |
2477 | EVP_PKEY_free(pr); | |
2478 | EVP_PKEY_CTX_free(ctx); | |
2479 | return NULL; | |
2480 | } | |
2481 | ||
2482 | ||
2483 | int dpp_auth_conf_rx(struct dpp_authentication *auth, const u8 *attr_start, | |
2484 | size_t attr_len) | |
2485 | { | |
2486 | const u8 *r_bootstrap, *i_bootstrap, *wrapped_data, *status, *i_auth; | |
2487 | u16 r_bootstrap_len, i_bootstrap_len, wrapped_data_len, status_len, | |
2488 | i_auth_len; | |
2489 | const u8 *addr[1]; | |
2490 | size_t len[1]; | |
2491 | u8 *unwrapped = NULL; | |
2492 | size_t unwrapped_len = 0; | |
2493 | u8 i_auth2[DPP_MAX_HASH_LEN]; | |
2494 | ||
2495 | wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA, | |
2496 | &wrapped_data_len); | |
2497 | if (!wrapped_data) { | |
2498 | wpa_printf(MSG_DEBUG, | |
2499 | "DPP: Missing required Wrapped data attribute"); | |
2500 | return -1; | |
2501 | } | |
2502 | wpa_hexdump(MSG_DEBUG, "DPP: Wrapped data", | |
2503 | wrapped_data, wrapped_data_len); | |
2504 | ||
2505 | if (wrapped_data_len < AES_BLOCK_SIZE) | |
2506 | return -1; | |
2507 | ||
2508 | attr_len = wrapped_data - 4 - attr_start; | |
2509 | ||
2510 | r_bootstrap = dpp_get_attr(attr_start, attr_len, | |
2511 | DPP_ATTR_R_BOOTSTRAP_KEY_HASH, | |
2512 | &r_bootstrap_len); | |
2513 | if (!r_bootstrap || r_bootstrap > wrapped_data || | |
2514 | r_bootstrap_len != SHA256_MAC_LEN) { | |
2515 | wpa_printf(MSG_DEBUG, | |
2516 | "DPP: Missing or invalid required Responder Bootstrapping Key Hash attribute"); | |
2517 | return -1; | |
2518 | } | |
2519 | wpa_hexdump(MSG_DEBUG, "DPP: Responder Bootstrapping Key Hash", | |
2520 | r_bootstrap, r_bootstrap_len); | |
2521 | if (os_memcmp(r_bootstrap, auth->own_bi->pubkey_hash, | |
2522 | SHA256_MAC_LEN) != 0) { | |
2523 | wpa_hexdump(MSG_DEBUG, | |
2524 | "DPP: Expected Responder Bootstrapping Key Hash", | |
2525 | auth->peer_bi->pubkey_hash, SHA256_MAC_LEN); | |
2526 | return -1; | |
2527 | } | |
2528 | ||
2529 | i_bootstrap = dpp_get_attr(attr_start, attr_len, | |
2530 | DPP_ATTR_I_BOOTSTRAP_KEY_HASH, | |
2531 | &i_bootstrap_len); | |
2532 | if (i_bootstrap) { | |
2533 | if (i_bootstrap > wrapped_data || | |
2534 | i_bootstrap_len != SHA256_MAC_LEN) { | |
2535 | wpa_printf(MSG_DEBUG, | |
2536 | "DPP: Invalid Initiator Bootstrapping Key Hash attribute"); | |
2537 | return -1; | |
2538 | } | |
2539 | wpa_hexdump(MSG_MSGDUMP, | |
2540 | "DPP: Initiator Bootstrapping Key Hash", | |
2541 | i_bootstrap, i_bootstrap_len); | |
2542 | if (!auth->peer_bi || | |
2543 | os_memcmp(i_bootstrap, auth->peer_bi->pubkey_hash, | |
2544 | SHA256_MAC_LEN) != 0) { | |
2545 | wpa_printf(MSG_DEBUG, | |
2546 | "DPP: Initiator Bootstrapping Key Hash attribute did not match"); | |
2547 | return -1; | |
2548 | } | |
2549 | } | |
2550 | ||
2551 | status = dpp_get_attr(attr_start, attr_len, DPP_ATTR_STATUS, | |
2552 | &status_len); | |
2553 | if (!status || status_len < 1) { | |
2554 | wpa_printf(MSG_DEBUG, | |
2555 | "DPP: Missing or invalid required DPP Status attribute"); | |
2556 | return -1; | |
2557 | } | |
2558 | wpa_printf(MSG_DEBUG, "DPP: Status %u", status[0]); | |
2559 | if (status[0] != DPP_STATUS_OK) { | |
2560 | wpa_printf(MSG_DEBUG, "DPP: Authentication failed"); | |
2561 | return -1; | |
2562 | } | |
2563 | ||
2564 | addr[0] = attr_start; | |
2565 | len[0] = attr_len; | |
2566 | wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD", addr[0], len[0]); | |
2567 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext", | |
2568 | wrapped_data, wrapped_data_len); | |
2569 | unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE; | |
2570 | unwrapped = os_malloc(unwrapped_len); | |
2571 | if (!unwrapped) | |
2572 | return -1; | |
2573 | if (aes_siv_decrypt(auth->ke, auth->curve->hash_len, | |
2574 | wrapped_data, wrapped_data_len, | |
2575 | 1, addr, len, unwrapped) < 0) { | |
2576 | wpa_printf(MSG_DEBUG, "DPP: AES-SIV decryption failed"); | |
2577 | goto fail; | |
2578 | } | |
2579 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext", | |
2580 | unwrapped, unwrapped_len); | |
2581 | ||
2582 | if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) { | |
2583 | wpa_printf(MSG_DEBUG, | |
2584 | "DPP: Invalid attribute in unwrapped data"); | |
2585 | goto fail; | |
2586 | } | |
2587 | ||
2588 | i_auth = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_I_AUTH_TAG, | |
2589 | &i_auth_len); | |
2590 | if (!i_auth || i_auth_len != auth->curve->hash_len) { | |
2591 | wpa_printf(MSG_DEBUG, | |
2592 | "DPP: Missing or invalid Initiator Authenticating Tag"); | |
2593 | goto fail; | |
2594 | } | |
2595 | wpa_hexdump(MSG_DEBUG, "DPP: Received Initiator Authenticating Tag", | |
2596 | i_auth, i_auth_len); | |
2597 | /* I-auth' = H(R-nonce | I-nonce | PR.x | PI.x | BR.x | [BI.x |] 1) */ | |
2598 | if (dpp_gen_i_auth(auth, i_auth2) < 0) | |
2599 | goto fail; | |
2600 | wpa_hexdump(MSG_DEBUG, "DPP: Calculated Initiator Authenticating Tag", | |
2601 | i_auth2, i_auth_len); | |
2602 | if (os_memcmp(i_auth, i_auth2, i_auth_len) != 0) { | |
2603 | wpa_printf(MSG_DEBUG, | |
2604 | "DPP: Mismatching Initiator Authenticating Tag"); | |
2605 | goto fail; | |
2606 | } | |
2607 | ||
2608 | bin_clear_free(unwrapped, unwrapped_len); | |
2609 | dpp_auth_success(auth); | |
2610 | return 0; | |
2611 | fail: | |
2612 | bin_clear_free(unwrapped, unwrapped_len); | |
2613 | return -1; | |
2614 | } | |
2615 | ||
2616 | ||
461d39af JM |
2617 | void dpp_configuration_free(struct dpp_configuration *conf) |
2618 | { | |
2619 | if (!conf) | |
2620 | return; | |
2621 | str_clear_free(conf->passphrase); | |
2622 | bin_clear_free(conf, sizeof(*conf)); | |
2623 | } | |
2624 | ||
2625 | ||
30d27b04 JM |
2626 | void dpp_auth_deinit(struct dpp_authentication *auth) |
2627 | { | |
2628 | if (!auth) | |
2629 | return; | |
461d39af JM |
2630 | dpp_configuration_free(auth->conf_ap); |
2631 | dpp_configuration_free(auth->conf_sta); | |
30d27b04 JM |
2632 | EVP_PKEY_free(auth->own_protocol_key); |
2633 | EVP_PKEY_free(auth->peer_protocol_key); | |
2634 | wpabuf_free(auth->req_attr); | |
2635 | wpabuf_free(auth->resp_attr); | |
461d39af JM |
2636 | wpabuf_free(auth->conf_req); |
2637 | os_free(auth->connector); | |
2638 | wpabuf_free(auth->net_access_key); | |
2639 | wpabuf_free(auth->c_sign_key); | |
2640 | #ifdef CONFIG_TESTING_OPTIONS | |
2641 | os_free(auth->config_obj_override); | |
2642 | os_free(auth->discovery_override); | |
2643 | os_free(auth->groups_override); | |
2644 | os_free(auth->devices_override); | |
2645 | #endif /* CONFIG_TESTING_OPTIONS */ | |
30d27b04 JM |
2646 | bin_clear_free(auth, sizeof(*auth)); |
2647 | } | |
461d39af JM |
2648 | |
2649 | ||
2650 | static struct wpabuf * | |
2651 | dpp_build_conf_start(struct dpp_authentication *auth, | |
2652 | struct dpp_configuration *conf, size_t tailroom) | |
2653 | { | |
2654 | struct wpabuf *buf; | |
2655 | char ssid[6 * sizeof(conf->ssid) + 1]; | |
2656 | ||
2657 | #ifdef CONFIG_TESTING_OPTIONS | |
2658 | if (auth->discovery_override) | |
2659 | tailroom += os_strlen(auth->discovery_override); | |
2660 | #endif /* CONFIG_TESTING_OPTIONS */ | |
2661 | ||
2662 | buf = wpabuf_alloc(200 + tailroom); | |
2663 | if (!buf) | |
2664 | return NULL; | |
2665 | wpabuf_put_str(buf, "{\"wi-fi_tech\":\"infra\",\"discovery\":"); | |
2666 | #ifdef CONFIG_TESTING_OPTIONS | |
2667 | if (auth->discovery_override) { | |
2668 | wpa_printf(MSG_DEBUG, "DPP: TESTING - discovery override: '%s'", | |
2669 | auth->discovery_override); | |
2670 | wpabuf_put_str(buf, auth->discovery_override); | |
2671 | wpabuf_put_u8(buf, ','); | |
2672 | return buf; | |
2673 | } | |
2674 | #endif /* CONFIG_TESTING_OPTIONS */ | |
2675 | wpabuf_put_str(buf, "{\"ssid\":\""); | |
2676 | json_escape_string(ssid, sizeof(ssid), | |
2677 | (const char *) conf->ssid, conf->ssid_len); | |
2678 | wpabuf_put_str(buf, ssid); | |
2679 | wpabuf_put_str(buf, "\""); | |
2680 | /* TODO: optional channel information */ | |
2681 | wpabuf_put_str(buf, "},"); | |
2682 | ||
2683 | return buf; | |
2684 | } | |
2685 | ||
2686 | ||
2687 | static int dpp_bn2bin_pad(const BIGNUM *bn, u8 *pos, size_t len) | |
2688 | { | |
2689 | int num_bytes, offset; | |
2690 | ||
2691 | num_bytes = BN_num_bytes(bn); | |
2692 | if ((size_t) num_bytes > len) | |
2693 | return -1; | |
2694 | offset = len - num_bytes; | |
2695 | os_memset(pos, 0, offset); | |
2696 | BN_bn2bin(bn, pos + offset); | |
2697 | return 0; | |
2698 | } | |
2699 | ||
2700 | ||
2701 | static int dpp_build_jwk(struct wpabuf *buf, const char *name, EVP_PKEY *key, | |
2702 | const char *kid, const struct dpp_curve_params *curve) | |
2703 | { | |
2704 | struct wpabuf *pub; | |
2705 | const u8 *pos; | |
2706 | char *x = NULL, *y = NULL; | |
2707 | int ret = -1; | |
2708 | ||
2709 | pub = dpp_get_pubkey_point(key, 0); | |
2710 | if (!pub) | |
2711 | goto fail; | |
2712 | pos = wpabuf_head(pub); | |
2713 | x = (char *) base64_url_encode(pos, curve->prime_len, NULL, 0); | |
2714 | pos += curve->prime_len; | |
2715 | y = (char *) base64_url_encode(pos, curve->prime_len, NULL, 0); | |
2716 | ||
2717 | wpabuf_put_str(buf, "\""); | |
2718 | wpabuf_put_str(buf, name); | |
2719 | wpabuf_put_str(buf, "\":{\"kty\":\"EC\",\"crv\":\""); | |
2720 | wpabuf_put_str(buf, curve->jwk_crv); | |
2721 | wpabuf_put_str(buf, "\",\"x\":\""); | |
2722 | wpabuf_put_str(buf, x); | |
2723 | wpabuf_put_str(buf, "\",\"y\":\""); | |
2724 | wpabuf_put_str(buf, y); | |
2725 | if (kid) { | |
2726 | wpabuf_put_str(buf, "\",\"kid\":\""); | |
2727 | wpabuf_put_str(buf, kid); | |
2728 | } | |
2729 | wpabuf_put_str(buf, "\"}"); | |
2730 | ret = 0; | |
2731 | out: | |
2732 | wpabuf_free(pub); | |
2733 | os_free(x); | |
2734 | os_free(y); | |
2735 | return ret; | |
2736 | fail: | |
2737 | goto out; | |
2738 | } | |
2739 | ||
2740 | ||
2741 | static struct wpabuf * | |
2742 | dpp_build_conf_obj_dpp(struct dpp_authentication *auth, int ap, | |
2743 | struct dpp_configuration *conf) | |
2744 | { | |
2745 | struct wpabuf *buf = NULL; | |
2746 | char *signed1 = NULL, *signed2 = NULL, *signed3 = NULL; | |
2747 | size_t tailroom; | |
2748 | const struct dpp_curve_params *curve; | |
2749 | char jws_prot_hdr[100]; | |
2750 | size_t signed1_len, signed2_len, signed3_len; | |
2751 | struct wpabuf *dppcon = NULL; | |
2752 | unsigned char *signature = NULL; | |
2753 | const unsigned char *p; | |
2754 | size_t signature_len; | |
2755 | EVP_MD_CTX *md_ctx = NULL; | |
2756 | ECDSA_SIG *sig = NULL; | |
2757 | char *dot = "."; | |
2758 | const char *alg; | |
2759 | const EVP_MD *sign_md; | |
2760 | const BIGNUM *r, *s; | |
2761 | size_t extra_len = 1000; | |
2762 | ||
2763 | if (!auth->conf) { | |
2764 | wpa_printf(MSG_INFO, | |
2765 | "DPP: No configurator specified - cannot generate DPP config object"); | |
2766 | goto fail; | |
2767 | } | |
2768 | curve = auth->conf->curve; | |
2769 | if (curve->hash_len == SHA256_MAC_LEN) { | |
2770 | alg = "ES256"; | |
2771 | sign_md = EVP_sha256(); | |
2772 | } else if (curve->hash_len == SHA384_MAC_LEN) { | |
2773 | alg = "ES384"; | |
2774 | sign_md = EVP_sha384(); | |
2775 | } else if (curve->hash_len == SHA512_MAC_LEN) { | |
2776 | alg = "ES512"; | |
2777 | sign_md = EVP_sha512(); | |
2778 | } else { | |
2779 | wpa_printf(MSG_DEBUG, "DPP: Unknown signature algorithm"); | |
2780 | goto fail; | |
2781 | } | |
2782 | ||
2783 | #ifdef CONFIG_TESTING_OPTIONS | |
2784 | if (auth->groups_override) | |
2785 | extra_len += os_strlen(auth->groups_override); | |
2786 | if (auth->devices_override) | |
2787 | extra_len += os_strlen(auth->devices_override); | |
2788 | #endif /* CONFIG_TESTING_OPTIONS */ | |
2789 | ||
2790 | /* Connector (JSON dppCon object) */ | |
2791 | dppcon = wpabuf_alloc(extra_len + 2 * auth->curve->prime_len * 4 / 3); | |
2792 | if (!dppcon) | |
2793 | goto fail; | |
2794 | #ifdef CONFIG_TESTING_OPTIONS | |
2795 | if (auth->groups_override || auth->devices_override) { | |
2796 | wpabuf_put_u8(dppcon, '{'); | |
2797 | if (auth->groups_override) { | |
2798 | wpa_printf(MSG_DEBUG, | |
2799 | "DPP: TESTING - groups override: '%s'", | |
2800 | auth->groups_override); | |
2801 | wpabuf_put_str(dppcon, "\"groups\":"); | |
2802 | wpabuf_put_str(dppcon, auth->groups_override); | |
2803 | wpabuf_put_u8(dppcon, ','); | |
2804 | } | |
2805 | if (auth->devices_override) { | |
2806 | wpa_printf(MSG_DEBUG, | |
2807 | "DPP: TESTING - devices override: '%s'", | |
2808 | auth->devices_override); | |
2809 | wpabuf_put_str(dppcon, "\"devices\":"); | |
2810 | wpabuf_put_str(dppcon, auth->devices_override); | |
2811 | wpabuf_put_u8(dppcon, ','); | |
2812 | } | |
2813 | goto skip_groups; | |
2814 | } | |
2815 | #endif /* CONFIG_TESTING_OPTIONS */ | |
2816 | wpabuf_put_str(dppcon, "{\"groups\":[{\"groupId\":\"*\","); | |
2817 | wpabuf_printf(dppcon, "\"netRole\":\"%s\"}],", ap ? "ap" : "sta"); | |
2818 | #ifdef CONFIG_TESTING_OPTIONS | |
2819 | skip_groups: | |
2820 | #endif /* CONFIG_TESTING_OPTIONS */ | |
2821 | if (dpp_build_jwk(dppcon, "netAccessKey", auth->peer_protocol_key, NULL, | |
2822 | auth->curve) < 0) { | |
2823 | wpa_printf(MSG_DEBUG, "DPP: Failed to build netAccessKey JWK"); | |
2824 | goto fail; | |
2825 | } | |
2826 | if (conf->netaccesskey_expiry) { | |
2827 | struct os_tm tm; | |
2828 | ||
2829 | if (os_gmtime(conf->netaccesskey_expiry, &tm) < 0) { | |
2830 | wpa_printf(MSG_DEBUG, | |
2831 | "DPP: Failed to generate expiry string"); | |
2832 | goto fail; | |
2833 | } | |
2834 | wpabuf_printf(dppcon, | |
2835 | ",\"expiry\":\"%04u-%02u-%02uT%02u:%02u:%02uZ\"", | |
2836 | tm.year, tm.month, tm.day, | |
2837 | tm.hour, tm.min, tm.sec); | |
2838 | } | |
2839 | wpabuf_put_u8(dppcon, '}'); | |
2840 | wpa_printf(MSG_DEBUG, "DPP: dppCon: %s", | |
2841 | (const char *) wpabuf_head(dppcon)); | |
2842 | ||
2843 | os_snprintf(jws_prot_hdr, sizeof(jws_prot_hdr), | |
2844 | "{\"typ\":\"dppCon\",\"kid\":\"%s\",\"alg\":\"%s\"}", | |
2845 | auth->conf->kid, alg); | |
2846 | signed1 = (char *) base64_url_encode((unsigned char *) jws_prot_hdr, | |
2847 | os_strlen(jws_prot_hdr), | |
2848 | &signed1_len, 0); | |
2849 | signed2 = (char *) base64_url_encode(wpabuf_head(dppcon), | |
2850 | wpabuf_len(dppcon), | |
2851 | &signed2_len, 0); | |
2852 | if (!signed1 || !signed2) | |
2853 | goto fail; | |
2854 | ||
2855 | md_ctx = EVP_MD_CTX_create(); | |
2856 | if (!md_ctx) | |
2857 | goto fail; | |
2858 | ||
2859 | ERR_clear_error(); | |
2860 | if (EVP_DigestSignInit(md_ctx, NULL, sign_md, NULL, | |
2861 | auth->conf->csign) != 1) { | |
2862 | wpa_printf(MSG_DEBUG, "DPP: EVP_DigestSignInit failed: %s", | |
2863 | ERR_error_string(ERR_get_error(), NULL)); | |
2864 | goto fail; | |
2865 | } | |
2866 | if (EVP_DigestSignUpdate(md_ctx, signed1, signed1_len) != 1 || | |
2867 | EVP_DigestSignUpdate(md_ctx, dot, 1) != 1 || | |
2868 | EVP_DigestSignUpdate(md_ctx, signed2, signed2_len) != 1) { | |
2869 | wpa_printf(MSG_DEBUG, "DPP: EVP_DigestSignUpdate failed: %s", | |
2870 | ERR_error_string(ERR_get_error(), NULL)); | |
2871 | goto fail; | |
2872 | } | |
2873 | if (EVP_DigestSignFinal(md_ctx, NULL, &signature_len) != 1) { | |
2874 | wpa_printf(MSG_DEBUG, "DPP: EVP_DigestSignFinal failed: %s", | |
2875 | ERR_error_string(ERR_get_error(), NULL)); | |
2876 | goto fail; | |
2877 | } | |
2878 | signature = os_malloc(signature_len); | |
2879 | if (!signature) | |
2880 | goto fail; | |
2881 | if (EVP_DigestSignFinal(md_ctx, signature, &signature_len) != 1) { | |
2882 | wpa_printf(MSG_DEBUG, "DPP: EVP_DigestSignFinal failed: %s", | |
2883 | ERR_error_string(ERR_get_error(), NULL)); | |
2884 | goto fail; | |
2885 | } | |
2886 | wpa_hexdump(MSG_DEBUG, "DPP: signedConnector ECDSA signature (DER)", | |
2887 | signature, signature_len); | |
2888 | /* Convert to raw coordinates r,s */ | |
2889 | p = signature; | |
2890 | sig = d2i_ECDSA_SIG(NULL, &p, signature_len); | |
2891 | if (!sig) | |
2892 | goto fail; | |
2893 | ECDSA_SIG_get0(sig, &r, &s); | |
2894 | if (dpp_bn2bin_pad(r, signature, curve->prime_len) < 0 || | |
2895 | dpp_bn2bin_pad(s, signature + curve->prime_len, | |
2896 | curve->prime_len) < 0) | |
2897 | goto fail; | |
2898 | signature_len = 2 * curve->prime_len; | |
2899 | wpa_hexdump(MSG_DEBUG, "DPP: signedConnector ECDSA signature (raw r,s)", | |
2900 | signature, signature_len); | |
2901 | signed3 = (char *) base64_url_encode(signature, signature_len, | |
2902 | &signed3_len, 0); | |
2903 | if (!signed3) | |
2904 | goto fail; | |
2905 | ||
2906 | tailroom = 1000; | |
2907 | tailroom += 2 * curve->prime_len * 4 / 3 + os_strlen(auth->conf->kid); | |
2908 | tailroom += signed1_len + signed2_len + signed3_len; | |
2909 | buf = dpp_build_conf_start(auth, conf, tailroom); | |
2910 | if (!buf) | |
2911 | return NULL; | |
2912 | ||
2913 | wpabuf_put_str(buf, "\"cred\":{\"akm\":\"dpp\",\"signedConnector\":\""); | |
2914 | wpabuf_put_str(buf, signed1); | |
2915 | wpabuf_put_u8(buf, '.'); | |
2916 | wpabuf_put_str(buf, signed2); | |
2917 | wpabuf_put_u8(buf, '.'); | |
2918 | wpabuf_put_str(buf, signed3); | |
2919 | wpabuf_put_str(buf, "\","); | |
2920 | if (dpp_build_jwk(buf, "csign", auth->conf->csign, auth->conf->kid, | |
2921 | curve) < 0) { | |
2922 | wpa_printf(MSG_DEBUG, "DPP: Failed to build csign JWK"); | |
2923 | goto fail; | |
2924 | } | |
2925 | if (auth->conf->csign_expiry) { | |
2926 | struct os_tm tm; | |
2927 | ||
2928 | if (os_gmtime(auth->conf->csign_expiry, &tm) < 0) { | |
2929 | wpa_printf(MSG_DEBUG, | |
2930 | "DPP: Failed to generate expiry string"); | |
2931 | goto fail; | |
2932 | } | |
2933 | wpabuf_printf(buf, | |
2934 | ",\"expiry\":\"%04u-%02u-%02uT%02u:%02u:%02uZ\"", | |
2935 | tm.year, tm.month, tm.day, | |
2936 | tm.hour, tm.min, tm.sec); | |
2937 | } | |
2938 | ||
2939 | wpabuf_put_str(buf, "}}"); | |
2940 | ||
2941 | wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: Configuration Object", | |
2942 | wpabuf_head(buf), wpabuf_len(buf)); | |
2943 | ||
2944 | out: | |
2945 | EVP_MD_CTX_destroy(md_ctx); | |
2946 | ECDSA_SIG_free(sig); | |
2947 | os_free(signed1); | |
2948 | os_free(signed2); | |
2949 | os_free(signed3); | |
2950 | os_free(signature); | |
2951 | wpabuf_free(dppcon); | |
2952 | return buf; | |
2953 | fail: | |
2954 | wpa_printf(MSG_DEBUG, "DPP: Failed to build configuration object"); | |
2955 | wpabuf_free(buf); | |
2956 | buf = NULL; | |
2957 | goto out; | |
2958 | } | |
2959 | ||
2960 | ||
2961 | static struct wpabuf * | |
2962 | dpp_build_conf_obj_legacy(struct dpp_authentication *auth, int ap, | |
2963 | struct dpp_configuration *conf) | |
2964 | { | |
2965 | struct wpabuf *buf; | |
2966 | ||
2967 | buf = dpp_build_conf_start(auth, conf, 1000); | |
2968 | if (!buf) | |
2969 | return NULL; | |
2970 | ||
2971 | wpabuf_put_str(buf, "\"cred\":{\"akm\":\"psk\","); | |
2972 | if (conf->passphrase) { | |
2973 | char pass[63 * 6 + 1]; | |
2974 | ||
2975 | if (os_strlen(conf->passphrase) > 63) { | |
2976 | wpabuf_free(buf); | |
2977 | return NULL; | |
2978 | } | |
2979 | ||
2980 | json_escape_string(pass, sizeof(pass), conf->passphrase, | |
2981 | os_strlen(conf->passphrase)); | |
2982 | wpabuf_put_str(buf, "\"pass\":\""); | |
2983 | wpabuf_put_str(buf, pass); | |
2984 | wpabuf_put_str(buf, "\""); | |
2985 | } else { | |
2986 | char psk[2 * sizeof(conf->psk) + 1]; | |
2987 | ||
2988 | wpa_snprintf_hex(psk, sizeof(psk), | |
2989 | conf->psk, sizeof(conf->psk)); | |
2990 | wpabuf_put_str(buf, "\"psk_hex\":\""); | |
2991 | wpabuf_put_str(buf, psk); | |
2992 | wpabuf_put_str(buf, "\""); | |
2993 | } | |
2994 | wpabuf_put_str(buf, "}}"); | |
2995 | ||
2996 | wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: Configuration Object (legacy)", | |
2997 | wpabuf_head(buf), wpabuf_len(buf)); | |
2998 | ||
2999 | return buf; | |
3000 | } | |
3001 | ||
3002 | ||
3003 | static struct wpabuf * | |
3004 | dpp_build_conf_obj(struct dpp_authentication *auth, int ap) | |
3005 | { | |
3006 | struct dpp_configuration *conf; | |
3007 | ||
3008 | #ifdef CONFIG_TESTING_OPTIONS | |
3009 | if (auth->config_obj_override) { | |
3010 | wpa_printf(MSG_DEBUG, "DPP: Testing - Config Object override"); | |
3011 | return wpabuf_alloc_copy(auth->config_obj_override, | |
3012 | os_strlen(auth->config_obj_override)); | |
3013 | } | |
3014 | #endif /* CONFIG_TESTING_OPTIONS */ | |
3015 | ||
3016 | conf = ap ? auth->conf_ap : auth->conf_sta; | |
3017 | if (!conf) { | |
3018 | wpa_printf(MSG_DEBUG, | |
3019 | "DPP: No configuration available for Enrollee(%s) - reject configuration request", | |
3020 | ap ? "ap" : "sta"); | |
3021 | return NULL; | |
3022 | } | |
3023 | ||
3024 | if (conf->dpp) | |
3025 | return dpp_build_conf_obj_dpp(auth, ap, conf); | |
3026 | return dpp_build_conf_obj_legacy(auth, ap, conf); | |
3027 | } | |
3028 | ||
3029 | ||
3030 | static struct wpabuf * | |
3031 | dpp_build_conf_resp(struct dpp_authentication *auth, const u8 *e_nonce, | |
3032 | u16 e_nonce_len, int ap) | |
3033 | { | |
3034 | struct wpabuf *conf; | |
3035 | size_t clear_len; | |
3036 | struct wpabuf *clear = NULL, *msg = NULL; | |
3037 | u8 *wrapped; | |
3038 | const u8 *addr[1]; | |
3039 | size_t len[1]; | |
3040 | enum dpp_status_error status; | |
3041 | ||
3042 | conf = dpp_build_conf_obj(auth, ap); | |
3043 | if (conf) { | |
3044 | wpa_hexdump_ascii(MSG_DEBUG, "DPP: configurationObject JSON", | |
3045 | wpabuf_head(conf), wpabuf_len(conf)); | |
3046 | } | |
3047 | status = conf ? DPP_STATUS_OK : DPP_STATUS_CONFIGURE_FAILURE; | |
3048 | ||
3049 | /* { E-nonce, configurationObject}ke */ | |
3050 | clear_len = 4 + e_nonce_len; | |
3051 | if (conf) | |
3052 | clear_len += 4 + wpabuf_len(conf); | |
3053 | clear = wpabuf_alloc(clear_len); | |
3054 | msg = wpabuf_alloc(4 + 1 + 4 + clear_len + AES_BLOCK_SIZE); | |
3055 | if (!clear || !msg) | |
3056 | goto fail; | |
3057 | ||
3058 | /* E-nonce */ | |
3059 | wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE); | |
3060 | wpabuf_put_le16(clear, e_nonce_len); | |
3061 | wpabuf_put_data(clear, e_nonce, e_nonce_len); | |
3062 | ||
3063 | if (conf) { | |
3064 | wpabuf_put_le16(clear, DPP_ATTR_CONFIG_OBJ); | |
3065 | wpabuf_put_le16(clear, wpabuf_len(conf)); | |
3066 | wpabuf_put_buf(clear, conf); | |
3067 | wpabuf_free(conf); | |
3068 | conf = NULL; | |
3069 | } | |
3070 | ||
3071 | /* DPP Status */ | |
3072 | wpabuf_put_le16(msg, DPP_ATTR_STATUS); | |
3073 | wpabuf_put_le16(msg, 1); | |
3074 | wpabuf_put_u8(msg, status); | |
3075 | ||
3076 | addr[0] = wpabuf_head(msg); | |
3077 | len[0] = wpabuf_len(msg); | |
3078 | wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD", addr[0], len[0]); | |
3079 | ||
3080 | wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA); | |
3081 | wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE); | |
3082 | wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE); | |
3083 | ||
3084 | wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear); | |
3085 | if (aes_siv_encrypt(auth->ke, auth->curve->hash_len, | |
3086 | wpabuf_head(clear), wpabuf_len(clear), | |
3087 | 1, addr, len, wrapped) < 0) | |
3088 | goto fail; | |
3089 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext", | |
3090 | wrapped, wpabuf_len(clear) + AES_BLOCK_SIZE); | |
3091 | wpabuf_free(clear); | |
3092 | clear = NULL; | |
3093 | ||
3094 | wpa_hexdump_buf(MSG_DEBUG, | |
3095 | "DPP: Configuration Response attributes", msg); | |
3096 | return msg; | |
3097 | fail: | |
3098 | wpabuf_free(conf); | |
3099 | wpabuf_free(clear); | |
3100 | wpabuf_free(msg); | |
3101 | return NULL; | |
3102 | } | |
3103 | ||
3104 | ||
3105 | struct wpabuf * | |
3106 | dpp_conf_req_rx(struct dpp_authentication *auth, const u8 *attr_start, | |
3107 | size_t attr_len) | |
3108 | { | |
3109 | const u8 *wrapped_data, *e_nonce, *config_attr; | |
3110 | u16 wrapped_data_len, e_nonce_len, config_attr_len; | |
3111 | u8 *unwrapped = NULL; | |
3112 | size_t unwrapped_len = 0; | |
3113 | struct wpabuf *resp = NULL; | |
3114 | struct json_token *root = NULL, *token; | |
3115 | int ap; | |
3116 | ||
3117 | if (dpp_check_attrs(attr_start, attr_len) < 0) { | |
3118 | wpa_printf(MSG_DEBUG, | |
3119 | "DPP: Invalid attribute in config request"); | |
3120 | return NULL; | |
3121 | } | |
3122 | ||
3123 | wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA, | |
3124 | &wrapped_data_len); | |
3125 | if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) { | |
3126 | wpa_printf(MSG_DEBUG, | |
3127 | "DPP: Missing or invalid required Wrapped data attribute"); | |
3128 | return NULL; | |
3129 | } | |
3130 | ||
3131 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext", | |
3132 | wrapped_data, wrapped_data_len); | |
3133 | unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE; | |
3134 | unwrapped = os_malloc(unwrapped_len); | |
3135 | if (!unwrapped) | |
3136 | return NULL; | |
3137 | if (aes_siv_decrypt(auth->ke, auth->curve->hash_len, | |
3138 | wrapped_data, wrapped_data_len, | |
3139 | 0, NULL, NULL, unwrapped) < 0) { | |
3140 | wpa_printf(MSG_DEBUG, "DPP: AES-SIV decryption failed"); | |
3141 | goto fail; | |
3142 | } | |
3143 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext", | |
3144 | unwrapped, unwrapped_len); | |
3145 | ||
3146 | if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) { | |
3147 | wpa_printf(MSG_DEBUG, | |
3148 | "DPP: Invalid attribute in unwrapped data"); | |
3149 | goto fail; | |
3150 | } | |
3151 | ||
3152 | e_nonce = dpp_get_attr(unwrapped, unwrapped_len, | |
3153 | DPP_ATTR_ENROLLEE_NONCE, | |
3154 | &e_nonce_len); | |
3155 | if (!e_nonce || e_nonce_len != auth->curve->nonce_len) { | |
3156 | wpa_printf(MSG_DEBUG, | |
3157 | "DPP: Missing or invalid Enrollee Nonce attribute"); | |
3158 | goto fail; | |
3159 | } | |
3160 | wpa_hexdump(MSG_DEBUG, "DPP: Enrollee Nonce", e_nonce, e_nonce_len); | |
3161 | ||
3162 | config_attr = dpp_get_attr(unwrapped, unwrapped_len, | |
3163 | DPP_ATTR_CONFIG_ATTR_OBJ, | |
3164 | &config_attr_len); | |
3165 | if (!config_attr) { | |
3166 | wpa_printf(MSG_DEBUG, | |
3167 | "DPP: Missing or invalid Config Attributes attribute"); | |
3168 | goto fail; | |
3169 | } | |
3170 | wpa_hexdump_ascii(MSG_DEBUG, "DPP: Config Attributes", | |
3171 | config_attr, config_attr_len); | |
3172 | ||
3173 | root = json_parse((const char *) config_attr, config_attr_len); | |
3174 | if (!root) { | |
3175 | wpa_printf(MSG_DEBUG, "DPP: Could not parse Config Attributes"); | |
3176 | goto fail; | |
3177 | } | |
3178 | ||
3179 | token = json_get_member(root, "name"); | |
3180 | if (!token || token->type != JSON_STRING) { | |
3181 | wpa_printf(MSG_DEBUG, "DPP: No Config Attributes - name"); | |
3182 | goto fail; | |
3183 | } | |
3184 | wpa_printf(MSG_DEBUG, "DPP: Enrollee name = '%s'", token->string); | |
3185 | ||
3186 | token = json_get_member(root, "wi-fi_tech"); | |
3187 | if (!token || token->type != JSON_STRING) { | |
3188 | wpa_printf(MSG_DEBUG, "DPP: No Config Attributes - wi-fi_tech"); | |
3189 | goto fail; | |
3190 | } | |
3191 | wpa_printf(MSG_DEBUG, "DPP: wi-fi_tech = '%s'", token->string); | |
3192 | if (os_strcmp(token->string, "infra") != 0) { | |
3193 | wpa_printf(MSG_DEBUG, "DPP: Unsupported wi-fi_tech '%s'", | |
3194 | token->string); | |
3195 | goto fail; | |
3196 | } | |
3197 | ||
3198 | token = json_get_member(root, "netRole"); | |
3199 | if (!token || token->type != JSON_STRING) { | |
3200 | wpa_printf(MSG_DEBUG, "DPP: No Config Attributes - netRole"); | |
3201 | goto fail; | |
3202 | } | |
3203 | wpa_printf(MSG_DEBUG, "DPP: netRole = '%s'", token->string); | |
3204 | if (os_strcmp(token->string, "sta") == 0) { | |
3205 | ap = 0; | |
3206 | } else if (os_strcmp(token->string, "ap") == 0) { | |
3207 | ap = 1; | |
3208 | } else { | |
3209 | wpa_printf(MSG_DEBUG, "DPP: Unsupported netRole '%s'", | |
3210 | token->string); | |
3211 | goto fail; | |
3212 | } | |
3213 | ||
3214 | resp = dpp_build_conf_resp(auth, e_nonce, e_nonce_len, ap); | |
3215 | ||
3216 | fail: | |
3217 | json_free(root); | |
3218 | os_free(unwrapped); | |
3219 | return resp; | |
3220 | } | |
3221 | ||
3222 | ||
3223 | static struct wpabuf * | |
3224 | dpp_parse_jws_prot_hdr(const u8 *prot_hdr, u16 prot_hdr_len, | |
3225 | const EVP_MD **ret_md) | |
3226 | { | |
3227 | struct json_token *root, *token; | |
3228 | struct wpabuf *kid = NULL; | |
3229 | ||
3230 | root = json_parse((const char *) prot_hdr, prot_hdr_len); | |
3231 | if (!root) { | |
3232 | wpa_printf(MSG_DEBUG, | |
3233 | "DPP: JSON parsing failed for JWS Protected Header"); | |
3234 | goto fail; | |
3235 | } | |
3236 | ||
3237 | if (root->type != JSON_OBJECT) { | |
3238 | wpa_printf(MSG_DEBUG, | |
3239 | "DPP: JWS Protected Header root is not an object"); | |
3240 | goto fail; | |
3241 | } | |
3242 | ||
3243 | token = json_get_member(root, "typ"); | |
3244 | if (!token || token->type != JSON_STRING) { | |
3245 | wpa_printf(MSG_DEBUG, "DPP: No typ string value found"); | |
3246 | goto fail; | |
3247 | } | |
3248 | wpa_printf(MSG_DEBUG, "DPP: JWS Protected Header typ=%s", | |
3249 | token->string); | |
3250 | if (os_strcmp(token->string, "dppCon") != 0) { | |
3251 | wpa_printf(MSG_DEBUG, | |
3252 | "DPP: Unsupported JWS Protected Header typ=%s", | |
3253 | token->string); | |
3254 | goto fail; | |
3255 | } | |
3256 | ||
3257 | token = json_get_member(root, "alg"); | |
3258 | if (!token || token->type != JSON_STRING) { | |
3259 | wpa_printf(MSG_DEBUG, "DPP: No alg string value found"); | |
3260 | goto fail; | |
3261 | } | |
3262 | wpa_printf(MSG_DEBUG, "DPP: JWS Protected Header alg=%s", | |
3263 | token->string); | |
3264 | if (os_strcmp(token->string, "ES256") == 0) | |
3265 | *ret_md = EVP_sha256(); | |
3266 | else if (os_strcmp(token->string, "ES384") == 0) | |
3267 | *ret_md = EVP_sha384(); | |
3268 | else if (os_strcmp(token->string, "ES512") == 0) | |
3269 | *ret_md = EVP_sha512(); | |
3270 | else | |
3271 | *ret_md = NULL; | |
3272 | if (!*ret_md) { | |
3273 | wpa_printf(MSG_DEBUG, | |
3274 | "DPP: Unsupported JWS Protected Header alg=%s", | |
3275 | token->string); | |
3276 | goto fail; | |
3277 | } | |
3278 | ||
3279 | kid = json_get_member_base64url(root, "kid"); | |
3280 | if (!kid) { | |
3281 | wpa_printf(MSG_DEBUG, "DPP: No kid string value found"); | |
3282 | goto fail; | |
3283 | } | |
3284 | wpa_hexdump_buf(MSG_DEBUG, "DPP: JWS Protected Header kid (decoded)", | |
3285 | kid); | |
3286 | ||
3287 | fail: | |
3288 | json_free(root); | |
3289 | return kid; | |
3290 | } | |
3291 | ||
3292 | ||
3293 | static int dpp_parse_cred_legacy(struct dpp_authentication *auth, | |
3294 | struct json_token *cred) | |
3295 | { | |
3296 | struct json_token *pass, *psk_hex; | |
3297 | u8 psk[32]; | |
3298 | ||
3299 | wpa_printf(MSG_DEBUG, "DPP: Legacy akm=psk credential"); | |
3300 | ||
3301 | pass = json_get_member(cred, "pass"); | |
3302 | psk_hex = json_get_member(cred, "psk_hex"); | |
3303 | ||
3304 | if (pass && pass->type == JSON_STRING) { | |
3305 | wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: Legacy passphrase", | |
3306 | pass->string, os_strlen(pass->string)); | |
3307 | } else if (psk_hex && psk_hex->type == JSON_STRING) { | |
3308 | if (os_strlen(psk_hex->string) != sizeof(psk) * 2 || | |
3309 | hexstr2bin(psk_hex->string, psk, sizeof(psk)) < 0) { | |
3310 | wpa_printf(MSG_DEBUG, "DPP: Invalid psk_hex encoding"); | |
3311 | return -1; | |
3312 | } | |
3313 | wpa_hexdump_key(MSG_DEBUG, "DPP: Legacy PSK", psk, sizeof(psk)); | |
3314 | os_memset(psk, 0, sizeof(psk)); | |
3315 | } else { | |
3316 | wpa_printf(MSG_DEBUG, "DPP: No pass or psk_hex strings found"); | |
3317 | return -1; | |
3318 | } | |
3319 | ||
3320 | return 0; | |
3321 | } | |
3322 | ||
3323 | ||
3324 | static EVP_PKEY * dpp_parse_jwk(struct json_token *jwk, | |
3325 | const struct dpp_curve_params **key_curve) | |
3326 | { | |
3327 | struct json_token *token; | |
3328 | const struct dpp_curve_params *curve; | |
3329 | struct wpabuf *x = NULL, *y = NULL; | |
3330 | EC_GROUP *group; | |
3331 | EVP_PKEY *pkey = NULL; | |
3332 | ||
3333 | token = json_get_member(jwk, "kty"); | |
3334 | if (!token || token->type != JSON_STRING) { | |
3335 | wpa_printf(MSG_DEBUG, "DPP: No kty in JWK"); | |
3336 | goto fail; | |
3337 | } | |
3338 | if (os_strcmp(token->string, "EC") != 0) { | |
3339 | wpa_printf(MSG_DEBUG, "DPP: Unexpected JWK kty '%s", | |
3340 | token->string); | |
3341 | goto fail; | |
3342 | } | |
3343 | ||
3344 | token = json_get_member(jwk, "crv"); | |
3345 | if (!token || token->type != JSON_STRING) { | |
3346 | wpa_printf(MSG_DEBUG, "DPP: No crv in JWK"); | |
3347 | goto fail; | |
3348 | } | |
3349 | curve = dpp_get_curve_jwk_crv(token->string); | |
3350 | if (!curve) { | |
3351 | wpa_printf(MSG_DEBUG, "DPP: Unsupported JWK crv '%s'", | |
3352 | token->string); | |
3353 | goto fail; | |
3354 | } | |
3355 | ||
3356 | x = json_get_member_base64url(jwk, "x"); | |
3357 | if (!x) { | |
3358 | wpa_printf(MSG_DEBUG, "DPP: No x in JWK"); | |
3359 | goto fail; | |
3360 | } | |
3361 | wpa_hexdump_buf(MSG_DEBUG, "DPP: C-sign x", x); | |
3362 | if (wpabuf_len(x) != curve->prime_len) { | |
3363 | wpa_printf(MSG_DEBUG, | |
3364 | "DPP: Unexpected C-sign x length %u (expected %u for curve %s)", | |
3365 | (unsigned int) wpabuf_len(x), | |
3366 | (unsigned int) curve->prime_len, curve->name); | |
3367 | goto fail; | |
3368 | } | |
3369 | ||
3370 | y = json_get_member_base64url(jwk, "y"); | |
3371 | if (!y) { | |
3372 | wpa_printf(MSG_DEBUG, "DPP: No y in JWK"); | |
3373 | goto fail; | |
3374 | } | |
3375 | wpa_hexdump_buf(MSG_DEBUG, "DPP: C-sign y", y); | |
3376 | if (wpabuf_len(y) != curve->prime_len) { | |
3377 | wpa_printf(MSG_DEBUG, | |
3378 | "DPP: Unexpected C-sign y length %u (expected %u for curve %s)", | |
3379 | (unsigned int) wpabuf_len(y), | |
3380 | (unsigned int) curve->prime_len, curve->name); | |
3381 | goto fail; | |
3382 | } | |
3383 | ||
3384 | group = EC_GROUP_new_by_curve_name(OBJ_txt2nid(curve->name)); | |
3385 | if (!group) { | |
3386 | wpa_printf(MSG_DEBUG, "DPP: Could not prepare group for JWK"); | |
3387 | goto fail; | |
3388 | } | |
3389 | ||
3390 | pkey = dpp_set_pubkey_point_group(group, wpabuf_head(x), wpabuf_head(y), | |
3391 | wpabuf_len(x)); | |
3392 | *key_curve = curve; | |
3393 | ||
3394 | fail: | |
3395 | wpabuf_free(x); | |
3396 | wpabuf_free(y); | |
3397 | ||
3398 | return pkey; | |
3399 | } | |
3400 | ||
3401 | ||
3402 | int dpp_key_expired(const char *timestamp, os_time_t *expiry) | |
3403 | { | |
3404 | struct os_time now; | |
3405 | unsigned int year, month, day, hour, min, sec; | |
3406 | os_time_t utime; | |
3407 | const char *pos; | |
3408 | ||
3409 | /* ISO 8601 date and time: | |
3410 | * <date>T<time> | |
3411 | * YYYY-MM-DDTHH:MM:SSZ | |
3412 | * YYYY-MM-DDTHH:MM:SS+03:00 | |
3413 | */ | |
3414 | if (os_strlen(timestamp) < 19) { | |
3415 | wpa_printf(MSG_DEBUG, | |
3416 | "DPP: Too short timestamp - assume expired key"); | |
3417 | return 1; | |
3418 | } | |
3419 | if (sscanf(timestamp, "%04u-%02u-%02uT%02u:%02u:%02u", | |
3420 | &year, &month, &day, &hour, &min, &sec) != 6) { | |
3421 | wpa_printf(MSG_DEBUG, | |
3422 | "DPP: Failed to parse expiration day - assume expired key"); | |
3423 | return 1; | |
3424 | } | |
3425 | ||
3426 | if (os_mktime(year, month, day, hour, min, sec, &utime) < 0) { | |
3427 | wpa_printf(MSG_DEBUG, | |
3428 | "DPP: Invalid date/time information - assume expired key"); | |
3429 | return 1; | |
3430 | } | |
3431 | ||
3432 | pos = timestamp + 19; | |
3433 | if (*pos == 'Z' || *pos == '\0') { | |
3434 | /* In UTC - no need to adjust */ | |
3435 | } else if (*pos == '-' || *pos == '+') { | |
3436 | int items; | |
3437 | ||
3438 | /* Adjust local time to UTC */ | |
3439 | items = sscanf(pos + 1, "%02u:%02u", &hour, &min); | |
3440 | if (items < 1) { | |
3441 | wpa_printf(MSG_DEBUG, | |
3442 | "DPP: Invalid time zone designator (%s) - assume expired key", | |
3443 | pos); | |
3444 | return 1; | |
3445 | } | |
3446 | if (*pos == '-') | |
3447 | utime += 3600 * hour; | |
3448 | if (*pos == '+') | |
3449 | utime -= 3600 * hour; | |
3450 | if (items > 1) { | |
3451 | if (*pos == '-') | |
3452 | utime += 60 * min; | |
3453 | if (*pos == '+') | |
3454 | utime -= 60 * min; | |
3455 | } | |
3456 | } else { | |
3457 | wpa_printf(MSG_DEBUG, | |
3458 | "DPP: Invalid time zone designator (%s) - assume expired key", | |
3459 | pos); | |
3460 | return 1; | |
3461 | } | |
3462 | if (expiry) | |
3463 | *expiry = utime; | |
3464 | ||
3465 | if (os_get_time(&now) < 0) { | |
3466 | wpa_printf(MSG_DEBUG, | |
3467 | "DPP: Cannot get current time - assume expired key"); | |
3468 | return 1; | |
3469 | } | |
3470 | ||
3471 | if (now.sec > utime) { | |
3472 | wpa_printf(MSG_DEBUG, "DPP: Key has expired (%lu < %lu)", | |
3473 | utime, now.sec); | |
3474 | return 1; | |
3475 | } | |
3476 | ||
3477 | return 0; | |
3478 | } | |
3479 | ||
3480 | ||
3481 | static int dpp_parse_connector(struct dpp_authentication *auth, | |
3482 | const unsigned char *payload, | |
3483 | u16 payload_len) | |
3484 | { | |
3485 | struct json_token *root, *groups, *devices, *netkey, *token; | |
3486 | int ret = -1; | |
3487 | EVP_PKEY *key = NULL; | |
3488 | const struct dpp_curve_params *curve; | |
3489 | unsigned int rules = 0; | |
3490 | ||
3491 | root = json_parse((const char *) payload, payload_len); | |
3492 | if (!root) { | |
3493 | wpa_printf(MSG_DEBUG, "DPP: JSON parsing of connector failed"); | |
3494 | goto fail; | |
3495 | } | |
3496 | ||
3497 | groups = json_get_member(root, "groups"); | |
3498 | if (!groups || groups->type != JSON_ARRAY) { | |
3499 | wpa_printf(MSG_DEBUG, "DPP: No groups array found"); | |
3500 | goto skip_groups; | |
3501 | } | |
3502 | for (token = groups->child; token; token = token->sibling) { | |
3503 | struct json_token *id, *role; | |
3504 | ||
3505 | id = json_get_member(token, "groupId"); | |
3506 | if (!id || id->type != JSON_STRING) { | |
3507 | wpa_printf(MSG_DEBUG, "DPP: Missing groupId string"); | |
3508 | goto fail; | |
3509 | } | |
3510 | ||
3511 | role = json_get_member(token, "netRole"); | |
3512 | if (!role || role->type != JSON_STRING) { | |
3513 | wpa_printf(MSG_DEBUG, "DPP: Missing netRole string"); | |
3514 | goto fail; | |
3515 | } | |
3516 | wpa_printf(MSG_DEBUG, | |
3517 | "DPP: connector group: groupId='%s' netRole='%s'", | |
3518 | id->string, role->string); | |
3519 | rules++; | |
3520 | } | |
3521 | skip_groups: | |
3522 | ||
3523 | devices = json_get_member(root, "devices"); | |
3524 | if (!devices || devices->type != JSON_ARRAY) { | |
3525 | wpa_printf(MSG_DEBUG, "DPP: No devices array found"); | |
3526 | goto skip_devices; | |
3527 | } | |
3528 | for (token = devices->child; token; token = token->sibling) { | |
3529 | struct wpabuf *id; | |
3530 | struct json_token *role; | |
3531 | ||
3532 | id = json_get_member_base64url(token, "deviceId"); | |
3533 | if (!id) { | |
3534 | wpa_printf(MSG_DEBUG, | |
3535 | "DPP: Missing or invalid deviceId string"); | |
3536 | goto fail; | |
3537 | } | |
3538 | wpa_hexdump_buf(MSG_DEBUG, "DPP: deviceId", id); | |
3539 | if (wpabuf_len(id) != SHA256_MAC_LEN) { | |
3540 | wpa_printf(MSG_DEBUG, | |
3541 | "DPP: Unexpected deviceId length"); | |
3542 | wpabuf_free(id); | |
3543 | goto fail; | |
3544 | } | |
3545 | wpabuf_free(id); | |
3546 | ||
3547 | role = json_get_member(token, "netRole"); | |
3548 | if (!role || role->type != JSON_STRING) { | |
3549 | wpa_printf(MSG_DEBUG, "DPP: Missing netRole string"); | |
3550 | goto fail; | |
3551 | } | |
3552 | wpa_printf(MSG_DEBUG, "DPP: connector device netRole='%s'", | |
3553 | role->string); | |
3554 | rules++; | |
3555 | } | |
3556 | ||
3557 | skip_devices: | |
3558 | if (!rules) { | |
3559 | wpa_printf(MSG_DEBUG, | |
3560 | "DPP: Connector includes no groups or devices"); | |
3561 | goto fail; | |
3562 | } | |
3563 | ||
3564 | token = json_get_member(root, "expiry"); | |
3565 | if (!token || token->type != JSON_STRING) { | |
3566 | wpa_printf(MSG_DEBUG, | |
3567 | "DPP: No expiry string found - connector does not expire"); | |
3568 | } else { | |
3569 | wpa_printf(MSG_DEBUG, "DPP: expiry = %s", token->string); | |
3570 | if (dpp_key_expired(token->string, | |
3571 | &auth->net_access_key_expiry)) { | |
3572 | wpa_printf(MSG_DEBUG, | |
3573 | "DPP: Connector (netAccessKey) has expired"); | |
3574 | goto fail; | |
3575 | } | |
3576 | } | |
3577 | ||
3578 | netkey = json_get_member(root, "netAccessKey"); | |
3579 | if (!netkey || netkey->type != JSON_OBJECT) { | |
3580 | wpa_printf(MSG_DEBUG, "DPP: No netAccessKey object found"); | |
3581 | goto fail; | |
3582 | } | |
3583 | ||
3584 | key = dpp_parse_jwk(netkey, &curve); | |
3585 | if (!key) | |
3586 | goto fail; | |
3587 | dpp_debug_print_key("DPP: Received netAccessKey", key); | |
3588 | ||
3589 | if (EVP_PKEY_cmp(key, auth->own_protocol_key) != 1) { | |
3590 | wpa_printf(MSG_DEBUG, | |
3591 | "DPP: netAccessKey in connector does not match own protocol key"); | |
3592 | #ifdef CONFIG_TESTING_OPTIONS | |
3593 | if (auth->ignore_netaccesskey_mismatch) { | |
3594 | wpa_printf(MSG_DEBUG, | |
3595 | "DPP: TESTING - skip netAccessKey mismatch"); | |
3596 | } else { | |
3597 | goto fail; | |
3598 | } | |
3599 | #else /* CONFIG_TESTING_OPTIONS */ | |
3600 | goto fail; | |
3601 | #endif /* CONFIG_TESTING_OPTIONS */ | |
3602 | } | |
3603 | ||
3604 | ret = 0; | |
3605 | fail: | |
3606 | EVP_PKEY_free(key); | |
3607 | json_free(root); | |
3608 | return ret; | |
3609 | } | |
3610 | ||
3611 | ||
3612 | static int dpp_check_pubkey_match(EVP_PKEY *pub, struct wpabuf *r_hash) | |
3613 | { | |
3614 | struct wpabuf *uncomp; | |
3615 | int res; | |
3616 | u8 hash[SHA256_MAC_LEN]; | |
3617 | const u8 *addr[1]; | |
3618 | size_t len[1]; | |
3619 | ||
3620 | if (wpabuf_len(r_hash) != SHA256_MAC_LEN) | |
3621 | return -1; | |
3622 | uncomp = dpp_get_pubkey_point(pub, 1); | |
3623 | if (!uncomp) | |
3624 | return -1; | |
3625 | addr[0] = wpabuf_head(uncomp); | |
3626 | len[0] = wpabuf_len(uncomp); | |
3627 | wpa_hexdump(MSG_DEBUG, "DPP: Uncompressed public key", | |
3628 | addr[0], len[0]); | |
3629 | res = sha256_vector(1, addr, len, hash); | |
3630 | wpabuf_free(uncomp); | |
3631 | if (res < 0) | |
3632 | return -1; | |
3633 | if (os_memcmp(hash, wpabuf_head(r_hash), SHA256_MAC_LEN) != 0) { | |
3634 | wpa_printf(MSG_DEBUG, | |
3635 | "DPP: Received hash value does not match calculated public key hash value"); | |
3636 | wpa_hexdump(MSG_DEBUG, "DPP: Calculated hash", | |
3637 | hash, SHA256_MAC_LEN); | |
3638 | return -1; | |
3639 | } | |
3640 | return 0; | |
3641 | } | |
3642 | ||
3643 | ||
3644 | static void dpp_copy_csign(struct dpp_authentication *auth, EVP_PKEY *csign) | |
3645 | { | |
3646 | unsigned char *der = NULL; | |
3647 | int der_len; | |
3648 | ||
3649 | der_len = i2d_PUBKEY(csign, &der); | |
3650 | if (der_len <= 0) | |
3651 | return; | |
3652 | wpabuf_free(auth->c_sign_key); | |
3653 | auth->c_sign_key = wpabuf_alloc_copy(der, der_len); | |
3654 | OPENSSL_free(der); | |
3655 | } | |
3656 | ||
3657 | ||
3658 | static void dpp_copy_netaccesskey(struct dpp_authentication *auth) | |
3659 | { | |
3660 | unsigned char *der = NULL; | |
3661 | int der_len; | |
3662 | EC_KEY *eckey; | |
3663 | ||
3664 | eckey = EVP_PKEY_get1_EC_KEY(auth->own_protocol_key); | |
3665 | if (!eckey) | |
3666 | return; | |
3667 | ||
3668 | der_len = i2d_ECPrivateKey(eckey, &der); | |
3669 | if (der_len <= 0) { | |
3670 | EC_KEY_free(eckey); | |
3671 | return; | |
3672 | } | |
3673 | wpabuf_free(auth->net_access_key); | |
3674 | auth->net_access_key = wpabuf_alloc_copy(der, der_len); | |
3675 | OPENSSL_free(der); | |
3676 | EC_KEY_free(eckey); | |
3677 | } | |
3678 | ||
3679 | ||
3680 | struct dpp_signed_connector_info { | |
3681 | unsigned char *payload; | |
3682 | size_t payload_len; | |
3683 | }; | |
3684 | ||
3685 | static int | |
3686 | dpp_process_signed_connector(struct dpp_signed_connector_info *info, | |
3687 | EVP_PKEY *csign_pub, const char *connector) | |
3688 | { | |
3689 | int ret = -1; | |
3690 | const char *pos, *end, *signed_start, *signed_end; | |
3691 | struct wpabuf *kid = NULL; | |
3692 | unsigned char *prot_hdr = NULL, *signature = NULL; | |
3693 | size_t prot_hdr_len = 0, signature_len = 0; | |
3694 | const EVP_MD *sign_md = NULL; | |
3695 | unsigned char *der = NULL; | |
3696 | int der_len; | |
3697 | int res; | |
3698 | EVP_MD_CTX *md_ctx = NULL; | |
3699 | ECDSA_SIG *sig = NULL; | |
3700 | BIGNUM *r = NULL, *s = NULL; | |
3701 | ||
3702 | os_memset(info, 0, sizeof(*info)); | |
3703 | ||
3704 | signed_start = pos = connector; | |
3705 | end = os_strchr(pos, '.'); | |
3706 | if (!end) { | |
3707 | wpa_printf(MSG_DEBUG, "DPP: Missing dot(1) in signedConnector"); | |
3708 | goto fail; | |
3709 | } | |
3710 | prot_hdr = base64_url_decode((const unsigned char *) pos, | |
3711 | end - pos, &prot_hdr_len); | |
3712 | if (!prot_hdr) { | |
3713 | wpa_printf(MSG_DEBUG, | |
3714 | "DPP: Failed to base64url decode signedConnector JWS Protected Header"); | |
3715 | goto fail; | |
3716 | } | |
3717 | wpa_hexdump_ascii(MSG_DEBUG, | |
3718 | "DPP: signedConnector - JWS Protected Header", | |
3719 | prot_hdr, prot_hdr_len); | |
3720 | kid = dpp_parse_jws_prot_hdr(prot_hdr, prot_hdr_len, &sign_md); | |
3721 | if (!kid) | |
3722 | goto fail; | |
3723 | if (wpabuf_len(kid) != SHA256_MAC_LEN) { | |
3724 | wpa_printf(MSG_DEBUG, | |
3725 | "DPP: Unexpected signedConnector JWS Protected Header kid length: %u (expected %u)", | |
3726 | (unsigned int) wpabuf_len(kid), SHA256_MAC_LEN); | |
3727 | goto fail; | |
3728 | } | |
3729 | ||
3730 | pos = end + 1; | |
3731 | end = os_strchr(pos, '.'); | |
3732 | if (!end) { | |
3733 | wpa_printf(MSG_DEBUG, | |
3734 | "DPP: Missing dot(2) in signedConnector"); | |
3735 | goto fail; | |
3736 | } | |
3737 | signed_end = end - 1; | |
3738 | info->payload = base64_url_decode((const unsigned char *) pos, | |
3739 | end - pos, &info->payload_len); | |
3740 | if (!info->payload) { | |
3741 | wpa_printf(MSG_DEBUG, | |
3742 | "DPP: Failed to base64url decode signedConnector JWS Payload"); | |
3743 | goto fail; | |
3744 | } | |
3745 | wpa_hexdump_ascii(MSG_DEBUG, | |
3746 | "DPP: signedConnector - JWS Payload", | |
3747 | info->payload, info->payload_len); | |
3748 | pos = end + 1; | |
3749 | signature = base64_url_decode((const unsigned char *) pos, | |
3750 | os_strlen(pos), &signature_len); | |
3751 | if (!signature) { | |
3752 | wpa_printf(MSG_DEBUG, | |
3753 | "DPP: Failed to base64url decode signedConnector signature"); | |
3754 | goto fail; | |
3755 | } | |
3756 | wpa_hexdump(MSG_DEBUG, "DPP: signedConnector - signature", | |
3757 | signature, signature_len); | |
3758 | ||
3759 | if (dpp_check_pubkey_match(csign_pub, kid) < 0) | |
3760 | goto fail; | |
3761 | ||
3762 | if (signature_len & 0x01) { | |
3763 | wpa_printf(MSG_DEBUG, | |
3764 | "DPP: Unexpected signedConnector signature length (%d)", | |
3765 | (int) signature_len); | |
3766 | goto fail; | |
3767 | } | |
3768 | ||
3769 | /* JWS Signature encodes the signature (r,s) as two octet strings. Need | |
3770 | * to convert that to DER encoded ECDSA_SIG for OpenSSL EVP routines. */ | |
3771 | r = BN_bin2bn(signature, signature_len / 2, NULL); | |
3772 | s = BN_bin2bn(signature + signature_len / 2, signature_len / 2, NULL); | |
3773 | sig = ECDSA_SIG_new(); | |
3774 | if (!r || !s || !sig || ECDSA_SIG_set0(sig, r, s) != 1) | |
3775 | goto fail; | |
3776 | r = NULL; | |
3777 | s = NULL; | |
3778 | ||
3779 | der_len = i2d_ECDSA_SIG(sig, &der); | |
3780 | if (der_len <= 0) { | |
3781 | wpa_printf(MSG_DEBUG, "DPP: Could not DER encode signature"); | |
3782 | goto fail; | |
3783 | } | |
3784 | wpa_hexdump(MSG_DEBUG, "DPP: DER encoded signature", der, der_len); | |
3785 | md_ctx = EVP_MD_CTX_create(); | |
3786 | if (!md_ctx) | |
3787 | goto fail; | |
3788 | ||
3789 | ERR_clear_error(); | |
3790 | if (EVP_DigestVerifyInit(md_ctx, NULL, sign_md, NULL, csign_pub) != 1) { | |
3791 | wpa_printf(MSG_DEBUG, "DPP: EVP_DigestVerifyInit failed: %s", | |
3792 | ERR_error_string(ERR_get_error(), NULL)); | |
3793 | goto fail; | |
3794 | } | |
3795 | if (EVP_DigestVerifyUpdate(md_ctx, signed_start, | |
3796 | signed_end - signed_start + 1) != 1) { | |
3797 | wpa_printf(MSG_DEBUG, "DPP: EVP_DigestVerifyUpdate failed: %s", | |
3798 | ERR_error_string(ERR_get_error(), NULL)); | |
3799 | goto fail; | |
3800 | } | |
3801 | res = EVP_DigestVerifyFinal(md_ctx, der, der_len); | |
3802 | if (res != 1) { | |
3803 | wpa_printf(MSG_DEBUG, | |
3804 | "DPP: EVP_DigestVerifyFinal failed (res=%d): %s", | |
3805 | res, ERR_error_string(ERR_get_error(), NULL)); | |
3806 | goto fail; | |
3807 | } | |
3808 | ||
3809 | ret = 0; | |
3810 | fail: | |
3811 | EVP_MD_CTX_destroy(md_ctx); | |
3812 | os_free(prot_hdr); | |
3813 | wpabuf_free(kid); | |
3814 | os_free(signature); | |
3815 | ECDSA_SIG_free(sig); | |
3816 | BN_free(r); | |
3817 | BN_free(s); | |
3818 | OPENSSL_free(der); | |
3819 | return ret; | |
3820 | } | |
3821 | ||
3822 | ||
3823 | static int dpp_parse_cred_dpp(struct dpp_authentication *auth, | |
3824 | struct json_token *cred) | |
3825 | { | |
3826 | struct dpp_signed_connector_info info; | |
3827 | struct json_token *token, *csign; | |
3828 | int ret = -1; | |
3829 | EVP_PKEY *csign_pub = NULL; | |
3830 | const struct dpp_curve_params *key_curve = NULL; | |
3831 | const char *signed_connector; | |
3832 | ||
3833 | os_memset(&info, 0, sizeof(info)); | |
3834 | ||
3835 | wpa_printf(MSG_DEBUG, "DPP: Connector credential"); | |
3836 | ||
3837 | csign = json_get_member(cred, "csign"); | |
3838 | if (!csign || csign->type != JSON_OBJECT) { | |
3839 | wpa_printf(MSG_DEBUG, "DPP: No csign JWK in JSON"); | |
3840 | goto fail; | |
3841 | } | |
3842 | ||
3843 | csign_pub = dpp_parse_jwk(csign, &key_curve); | |
3844 | if (!csign_pub) { | |
3845 | wpa_printf(MSG_DEBUG, "DPP: Failed to parse csign JWK"); | |
3846 | goto fail; | |
3847 | } | |
3848 | dpp_debug_print_key("DPP: Received C-sign-key", csign_pub); | |
3849 | ||
3850 | token = json_get_member(cred, "expiry"); | |
3851 | if (!token || token->type != JSON_STRING) { | |
3852 | wpa_printf(MSG_DEBUG, | |
3853 | "DPP: No expiry string found - C-sign-key does not expire"); | |
3854 | } else { | |
3855 | wpa_printf(MSG_DEBUG, "DPP: expiry = %s", token->string); | |
3856 | if (dpp_key_expired(token->string, &auth->c_sign_key_expiry)) { | |
3857 | wpa_printf(MSG_DEBUG, "DPP: C-sign-key has expired"); | |
3858 | goto fail; | |
3859 | } | |
3860 | } | |
3861 | ||
3862 | token = json_get_member(cred, "signedConnector"); | |
3863 | if (!token || token->type != JSON_STRING) { | |
3864 | wpa_printf(MSG_DEBUG, "DPP: No signedConnector string found"); | |
3865 | goto fail; | |
3866 | } | |
3867 | wpa_hexdump_ascii(MSG_DEBUG, "DPP: signedConnector", | |
3868 | token->string, os_strlen(token->string)); | |
3869 | signed_connector = token->string; | |
3870 | ||
3871 | if (os_strchr(signed_connector, '"') || | |
3872 | os_strchr(signed_connector, '\n')) { | |
3873 | wpa_printf(MSG_DEBUG, | |
3874 | "DPP: Unexpected character in signedConnector"); | |
3875 | goto fail; | |
3876 | } | |
3877 | ||
3878 | if (dpp_process_signed_connector(&info, csign_pub, | |
3879 | signed_connector) < 0) | |
3880 | goto fail; | |
3881 | ||
3882 | if (dpp_parse_connector(auth, info.payload, info.payload_len) < 0) { | |
3883 | wpa_printf(MSG_DEBUG, "DPP: Failed to parse connector"); | |
3884 | goto fail; | |
3885 | } | |
3886 | ||
3887 | os_free(auth->connector); | |
3888 | auth->connector = os_strdup(signed_connector); | |
3889 | ||
3890 | dpp_copy_csign(auth, csign_pub); | |
3891 | dpp_copy_netaccesskey(auth); | |
3892 | ||
3893 | ret = 0; | |
3894 | fail: | |
3895 | EVP_PKEY_free(csign_pub); | |
3896 | os_free(info.payload); | |
3897 | return ret; | |
3898 | } | |
3899 | ||
3900 | ||
3901 | static int dpp_parse_conf_obj(struct dpp_authentication *auth, | |
3902 | const u8 *conf_obj, u16 conf_obj_len) | |
3903 | { | |
3904 | int ret = -1; | |
3905 | struct json_token *root, *token, *discovery, *cred; | |
3906 | ||
3907 | root = json_parse((const char *) conf_obj, conf_obj_len); | |
3908 | if (!root) | |
3909 | return -1; | |
3910 | if (root->type != JSON_OBJECT) { | |
3911 | wpa_printf(MSG_DEBUG, "DPP: JSON root is not an object"); | |
3912 | goto fail; | |
3913 | } | |
3914 | ||
3915 | token = json_get_member(root, "wi-fi_tech"); | |
3916 | if (!token || token->type != JSON_STRING) { | |
3917 | wpa_printf(MSG_DEBUG, "DPP: No wi-fi_tech string value found"); | |
3918 | goto fail; | |
3919 | } | |
3920 | if (os_strcmp(token->string, "infra") != 0) { | |
3921 | wpa_printf(MSG_DEBUG, "DPP: Unsupported wi-fi_tech value: '%s'", | |
3922 | token->string); | |
3923 | goto fail; | |
3924 | } | |
3925 | ||
3926 | discovery = json_get_member(root, "discovery"); | |
3927 | if (!discovery || discovery->type != JSON_OBJECT) { | |
3928 | wpa_printf(MSG_DEBUG, "DPP: No discovery object in JSON"); | |
3929 | goto fail; | |
3930 | } | |
3931 | ||
3932 | token = json_get_member(discovery, "ssid"); | |
3933 | if (!token || token->type != JSON_STRING) { | |
3934 | wpa_printf(MSG_DEBUG, | |
3935 | "DPP: No discovery::ssid string value found"); | |
3936 | goto fail; | |
3937 | } | |
3938 | wpa_hexdump_ascii(MSG_DEBUG, "DPP: discovery::ssid", | |
3939 | token->string, os_strlen(token->string)); | |
3940 | if (os_strlen(token->string) > SSID_MAX_LEN) { | |
3941 | wpa_printf(MSG_DEBUG, | |
3942 | "DPP: Too long discovery::ssid string value"); | |
3943 | goto fail; | |
3944 | } | |
3945 | auth->ssid_len = os_strlen(token->string); | |
3946 | os_memcpy(auth->ssid, token->string, auth->ssid_len); | |
3947 | ||
3948 | cred = json_get_member(root, "cred"); | |
3949 | if (!cred || cred->type != JSON_OBJECT) { | |
3950 | wpa_printf(MSG_DEBUG, "DPP: No cred object in JSON"); | |
3951 | goto fail; | |
3952 | } | |
3953 | ||
3954 | token = json_get_member(cred, "akm"); | |
3955 | if (!token || token->type != JSON_STRING) { | |
3956 | wpa_printf(MSG_DEBUG, | |
3957 | "DPP: No cred::akm string value found"); | |
3958 | goto fail; | |
3959 | } | |
3960 | if (os_strcmp(token->string, "psk") == 0) { | |
3961 | if (dpp_parse_cred_legacy(auth, cred) < 0) | |
3962 | goto fail; | |
3963 | } else if (os_strcmp(token->string, "dpp") == 0) { | |
3964 | if (dpp_parse_cred_dpp(auth, cred) < 0) | |
3965 | goto fail; | |
3966 | } else { | |
3967 | wpa_printf(MSG_DEBUG, "DPP: Unsupported akm: %s", | |
3968 | token->string); | |
3969 | goto fail; | |
3970 | } | |
3971 | ||
3972 | wpa_printf(MSG_DEBUG, "DPP: JSON parsing completed successfully"); | |
3973 | ret = 0; | |
3974 | fail: | |
3975 | json_free(root); | |
3976 | return ret; | |
3977 | } | |
3978 | ||
3979 | ||
3980 | int dpp_conf_resp_rx(struct dpp_authentication *auth, | |
3981 | const struct wpabuf *resp) | |
3982 | { | |
3983 | const u8 *wrapped_data, *e_nonce, *status, *conf_obj; | |
3984 | u16 wrapped_data_len, e_nonce_len, status_len, conf_obj_len; | |
3985 | const u8 *addr[1]; | |
3986 | size_t len[1]; | |
3987 | u8 *unwrapped = NULL; | |
3988 | size_t unwrapped_len = 0; | |
3989 | int ret = -1; | |
3990 | ||
3991 | if (dpp_check_attrs(wpabuf_head(resp), wpabuf_len(resp)) < 0) { | |
3992 | wpa_printf(MSG_DEBUG, | |
3993 | "DPP: Invalid attribute in config response"); | |
3994 | return -1; | |
3995 | } | |
3996 | ||
3997 | wrapped_data = dpp_get_attr(wpabuf_head(resp), wpabuf_len(resp), | |
3998 | DPP_ATTR_WRAPPED_DATA, | |
3999 | &wrapped_data_len); | |
4000 | if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) { | |
4001 | wpa_printf(MSG_DEBUG, | |
4002 | "DPP: Missing or invalid required Wrapped data attribute"); | |
4003 | return -1; | |
4004 | } | |
4005 | ||
4006 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext", | |
4007 | wrapped_data, wrapped_data_len); | |
4008 | unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE; | |
4009 | unwrapped = os_malloc(unwrapped_len); | |
4010 | if (!unwrapped) | |
4011 | return -1; | |
4012 | ||
4013 | addr[0] = wpabuf_head(resp); | |
4014 | len[0] = wrapped_data - 4 - (const u8 *) wpabuf_head(resp); | |
4015 | wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD", addr[0], len[0]); | |
4016 | ||
4017 | if (aes_siv_decrypt(auth->ke, auth->curve->hash_len, | |
4018 | wrapped_data, wrapped_data_len, | |
4019 | 1, addr, len, unwrapped) < 0) { | |
4020 | wpa_printf(MSG_DEBUG, "DPP: AES-SIV decryption failed"); | |
4021 | goto fail; | |
4022 | } | |
4023 | wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext", | |
4024 | unwrapped, unwrapped_len); | |
4025 | ||
4026 | if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) { | |
4027 | wpa_printf(MSG_DEBUG, | |
4028 | "DPP: Invalid attribute in unwrapped data"); | |
4029 | goto fail; | |
4030 | } | |
4031 | ||
4032 | e_nonce = dpp_get_attr(unwrapped, unwrapped_len, | |
4033 | DPP_ATTR_ENROLLEE_NONCE, | |
4034 | &e_nonce_len); | |
4035 | if (!e_nonce || e_nonce_len != auth->curve->nonce_len) { | |
4036 | wpa_printf(MSG_DEBUG, | |
4037 | "DPP: Missing or invalid Enrollee Nonce attribute"); | |
4038 | goto fail; | |
4039 | } | |
4040 | wpa_hexdump(MSG_DEBUG, "DPP: Enrollee Nonce", e_nonce, e_nonce_len); | |
4041 | if (os_memcmp(e_nonce, auth->e_nonce, e_nonce_len) != 0) { | |
4042 | wpa_printf(MSG_DEBUG, "Enrollee Nonce mismatch"); | |
4043 | goto fail; | |
4044 | } | |
4045 | ||
4046 | status = dpp_get_attr(wpabuf_head(resp), wpabuf_len(resp), | |
4047 | DPP_ATTR_STATUS, &status_len); | |
4048 | if (!status || status_len < 1) { | |
4049 | wpa_printf(MSG_DEBUG, | |
4050 | "DPP: Missing or invalid required DPP Status attribute"); | |
4051 | goto fail; | |
4052 | } | |
4053 | wpa_printf(MSG_DEBUG, "DPP: Status %u", status[0]); | |
4054 | if (status[0] != DPP_STATUS_OK) { | |
4055 | wpa_printf(MSG_DEBUG, "DPP: Configuration failed"); | |
4056 | goto fail; | |
4057 | } | |
4058 | ||
4059 | conf_obj = dpp_get_attr(unwrapped, unwrapped_len, | |
4060 | DPP_ATTR_CONFIG_OBJ, &conf_obj_len); | |
4061 | if (!conf_obj) { | |
4062 | wpa_printf(MSG_DEBUG, | |
4063 | "DPP: Missing required Configuration Object attribute"); | |
4064 | goto fail; | |
4065 | } | |
4066 | wpa_hexdump_ascii(MSG_DEBUG, "DPP: configurationObject JSON", | |
4067 | conf_obj, conf_obj_len); | |
4068 | if (dpp_parse_conf_obj(auth, conf_obj, conf_obj_len) < 0) | |
4069 | goto fail; | |
4070 | ||
4071 | ret = 0; | |
4072 | ||
4073 | fail: | |
4074 | os_free(unwrapped); | |
4075 | return ret; | |
4076 | } | |
4077 | ||
4078 | ||
4079 | void dpp_configurator_free(struct dpp_configurator *conf) | |
4080 | { | |
4081 | if (!conf) | |
4082 | return; | |
4083 | EVP_PKEY_free(conf->csign); | |
4084 | os_free(conf->kid); | |
4085 | os_free(conf); | |
4086 | } | |
4087 | ||
4088 | ||
4089 | struct dpp_configurator * | |
4090 | dpp_keygen_configurator(const char *curve, const u8 *privkey, | |
4091 | size_t privkey_len) | |
4092 | { | |
4093 | struct dpp_configurator *conf; | |
4094 | struct wpabuf *csign_pub = NULL; | |
4095 | u8 kid_hash[SHA256_MAC_LEN]; | |
4096 | const u8 *addr[1]; | |
4097 | size_t len[1]; | |
4098 | ||
4099 | conf = os_zalloc(sizeof(*conf)); | |
4100 | if (!conf) | |
4101 | return NULL; | |
4102 | ||
4103 | if (!curve) { | |
4104 | conf->curve = &dpp_curves[0]; | |
4105 | } else { | |
4106 | conf->curve = dpp_get_curve_name(curve); | |
4107 | if (!conf->curve) { | |
4108 | wpa_printf(MSG_INFO, "DPP: Unsupported curve: %s", | |
4109 | curve); | |
4110 | return NULL; | |
4111 | } | |
4112 | } | |
4113 | if (privkey) | |
4114 | conf->csign = dpp_set_keypair(&conf->curve, privkey, | |
4115 | privkey_len); | |
4116 | else | |
4117 | conf->csign = dpp_gen_keypair(conf->curve); | |
4118 | if (!conf->csign) | |
4119 | goto fail; | |
4120 | conf->own = 1; | |
4121 | ||
4122 | csign_pub = dpp_get_pubkey_point(conf->csign, 1); | |
4123 | if (!csign_pub) { | |
4124 | wpa_printf(MSG_INFO, "DPP: Failed to extract C-sign-key"); | |
4125 | goto fail; | |
4126 | } | |
4127 | ||
4128 | /* kid = SHA256(ANSI X9.63 uncompressed C-sign-key) */ | |
4129 | addr[0] = wpabuf_head(csign_pub); | |
4130 | len[0] = wpabuf_len(csign_pub); | |
4131 | if (sha256_vector(1, addr, len, kid_hash) < 0) { | |
4132 | wpa_printf(MSG_DEBUG, | |
4133 | "DPP: Failed to derive kid for C-sign-key"); | |
4134 | goto fail; | |
4135 | } | |
4136 | ||
4137 | conf->kid = (char *) base64_url_encode(kid_hash, sizeof(kid_hash), | |
4138 | NULL, 0); | |
4139 | if (!conf->kid) | |
4140 | goto fail; | |
4141 | out: | |
4142 | wpabuf_free(csign_pub); | |
4143 | return conf; | |
4144 | fail: | |
4145 | dpp_configurator_free(conf); | |
4146 | conf = NULL; | |
4147 | goto out; | |
4148 | } |