1 /* 2 * hostapd - PMKSA cache for IEEE 802.11i RSN 3 * Copyright (c) 2004-2008, 2012-2015, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "utils/includes.h" 10 11 #include "utils/common.h" 12 #include "utils/eloop.h" 13 #include "eapol_auth/eapol_auth_sm.h" 14 #include "eapol_auth/eapol_auth_sm_i.h" 15 #include "radius/radius_das.h" 16 #include "sta_info.h" 17 #include "ap_config.h" 18 #include "pmksa_cache_auth.h" 19 20 21 static const int pmksa_cache_max_entries = 1024; 22 static const int dot11RSNAConfigPMKLifetime = 43200; 23 24 struct rsn_pmksa_cache { 25 #define PMKID_HASH_SIZE 128 26 #define PMKID_HASH(pmkid) (unsigned int) ((pmkid)[0] & 0x7f) 27 struct rsn_pmksa_cache_entry *pmkid[PMKID_HASH_SIZE]; 28 struct rsn_pmksa_cache_entry *pmksa; 29 int pmksa_count; 30 31 void (*free_cb)(struct rsn_pmksa_cache_entry *entry, void *ctx); 32 void *ctx; 33 }; 34 35 36 static void pmksa_cache_set_expiration(struct rsn_pmksa_cache *pmksa); 37 38 39 static void _pmksa_cache_free_entry(struct rsn_pmksa_cache_entry *entry) 40 { 41 os_free(entry->vlan_desc); 42 os_free(entry->identity); 43 wpabuf_free(entry->cui); 44 #ifndef CONFIG_NO_RADIUS 45 radius_free_class(&entry->radius_class); 46 #endif /* CONFIG_NO_RADIUS */ 47 bin_clear_free(entry, sizeof(*entry)); 48 } 49 50 51 void pmksa_cache_free_entry(struct rsn_pmksa_cache *pmksa, 52 struct rsn_pmksa_cache_entry *entry) 53 { 54 struct rsn_pmksa_cache_entry *pos, *prev; 55 unsigned int hash; 56 57 pmksa->pmksa_count--; 58 pmksa->free_cb(entry, pmksa->ctx); 59 60 /* unlink from hash list */ 61 hash = PMKID_HASH(entry->pmkid); 62 pos = pmksa->pmkid[hash]; 63 prev = NULL; 64 while (pos) { 65 if (pos == entry) { 66 if (prev != NULL) 67 prev->hnext = entry->hnext; 68 else 69 pmksa->pmkid[hash] = entry->hnext; 70 break; 71 } 72 prev = pos; 73 pos = pos->hnext; 74 } 75 76 /* unlink from entry list */ 77 pos = pmksa->pmksa; 78 prev = NULL; 79 while (pos) { 80 if (pos == entry) { 81 if (prev != NULL) 82 prev->next = entry->next; 83 else 84 pmksa->pmksa = entry->next; 85 break; 86 } 87 prev = pos; 88 pos = pos->next; 89 } 90 91 _pmksa_cache_free_entry(entry); 92 } 93 94 95 /** 96 * pmksa_cache_auth_flush - Flush all PMKSA cache entries 97 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init() 98 */ 99 void pmksa_cache_auth_flush(struct rsn_pmksa_cache *pmksa) 100 { 101 while (pmksa->pmksa) { 102 wpa_printf(MSG_DEBUG, "RSN: Flush PMKSA cache entry for " 103 MACSTR, MAC2STR(pmksa->pmksa->spa)); 104 pmksa_cache_free_entry(pmksa, pmksa->pmksa); 105 } 106 } 107 108 109 static void pmksa_cache_expire(void *eloop_ctx, void *timeout_ctx) 110 { 111 struct rsn_pmksa_cache *pmksa = eloop_ctx; 112 struct os_reltime now; 113 114 os_get_reltime(&now); 115 while (pmksa->pmksa && pmksa->pmksa->expiration <= now.sec) { 116 wpa_printf(MSG_DEBUG, "RSN: expired PMKSA cache entry for " 117 MACSTR, MAC2STR(pmksa->pmksa->spa)); 118 pmksa_cache_free_entry(pmksa, pmksa->pmksa); 119 } 120 121 pmksa_cache_set_expiration(pmksa); 122 } 123 124 125 static void pmksa_cache_set_expiration(struct rsn_pmksa_cache *pmksa) 126 { 127 int sec; 128 struct os_reltime now; 129 130 eloop_cancel_timeout(pmksa_cache_expire, pmksa, NULL); 131 if (pmksa->pmksa == NULL) 132 return; 133 os_get_reltime(&now); 134 sec = pmksa->pmksa->expiration - now.sec; 135 if (sec < 0) 136 sec = 0; 137 eloop_register_timeout(sec + 1, 0, pmksa_cache_expire, pmksa, NULL); 138 } 139 140 141 static void pmksa_cache_from_eapol_data(struct rsn_pmksa_cache_entry *entry, 142 struct eapol_state_machine *eapol) 143 { 144 struct vlan_description *vlan_desc; 145 146 if (eapol == NULL) 147 return; 148 149 if (eapol->identity) { 150 entry->identity = os_malloc(eapol->identity_len); 151 if (entry->identity) { 152 entry->identity_len = eapol->identity_len; 153 os_memcpy(entry->identity, eapol->identity, 154 eapol->identity_len); 155 } 156 } 157 158 if (eapol->radius_cui) 159 entry->cui = wpabuf_dup(eapol->radius_cui); 160 161 #ifndef CONFIG_NO_RADIUS 162 radius_copy_class(&entry->radius_class, &eapol->radius_class); 163 #endif /* CONFIG_NO_RADIUS */ 164 165 entry->eap_type_authsrv = eapol->eap_type_authsrv; 166 167 vlan_desc = ((struct sta_info *) eapol->sta)->vlan_desc; 168 if (vlan_desc && vlan_desc->notempty) { 169 entry->vlan_desc = os_zalloc(sizeof(struct vlan_description)); 170 if (entry->vlan_desc) 171 *entry->vlan_desc = *vlan_desc; 172 } else { 173 entry->vlan_desc = NULL; 174 } 175 176 entry->acct_multi_session_id = eapol->acct_multi_session_id; 177 } 178 179 180 void pmksa_cache_to_eapol_data(struct hostapd_data *hapd, 181 struct rsn_pmksa_cache_entry *entry, 182 struct eapol_state_machine *eapol) 183 { 184 if (entry == NULL || eapol == NULL) 185 return; 186 187 if (entry->identity) { 188 os_free(eapol->identity); 189 eapol->identity = os_malloc(entry->identity_len); 190 if (eapol->identity) { 191 eapol->identity_len = entry->identity_len; 192 os_memcpy(eapol->identity, entry->identity, 193 entry->identity_len); 194 } 195 wpa_hexdump_ascii(MSG_DEBUG, "STA identity from PMKSA", 196 eapol->identity, eapol->identity_len); 197 } 198 199 if (entry->cui) { 200 wpabuf_free(eapol->radius_cui); 201 eapol->radius_cui = wpabuf_dup(entry->cui); 202 } 203 204 #ifndef CONFIG_NO_RADIUS 205 radius_free_class(&eapol->radius_class); 206 radius_copy_class(&eapol->radius_class, &entry->radius_class); 207 #endif /* CONFIG_NO_RADIUS */ 208 if (eapol->radius_class.attr) { 209 wpa_printf(MSG_DEBUG, "Copied %lu Class attribute(s) from " 210 "PMKSA", (unsigned long) eapol->radius_class.count); 211 } 212 213 eapol->eap_type_authsrv = entry->eap_type_authsrv; 214 #ifndef CONFIG_NO_VLAN 215 ap_sta_set_vlan(hapd, eapol->sta, entry->vlan_desc); 216 #endif /* CONFIG_NO_VLAN */ 217 218 eapol->acct_multi_session_id = entry->acct_multi_session_id; 219 } 220 221 222 static void pmksa_cache_link_entry(struct rsn_pmksa_cache *pmksa, 223 struct rsn_pmksa_cache_entry *entry) 224 { 225 struct rsn_pmksa_cache_entry *pos, *prev; 226 int hash; 227 228 /* Add the new entry; order by expiration time */ 229 pos = pmksa->pmksa; 230 prev = NULL; 231 while (pos) { 232 if (pos->expiration > entry->expiration) 233 break; 234 prev = pos; 235 pos = pos->next; 236 } 237 if (prev == NULL) { 238 entry->next = pmksa->pmksa; 239 pmksa->pmksa = entry; 240 } else { 241 entry->next = prev->next; 242 prev->next = entry; 243 } 244 245 hash = PMKID_HASH(entry->pmkid); 246 entry->hnext = pmksa->pmkid[hash]; 247 pmksa->pmkid[hash] = entry; 248 249 pmksa->pmksa_count++; 250 if (prev == NULL) 251 pmksa_cache_set_expiration(pmksa); 252 wpa_printf(MSG_DEBUG, "RSN: added PMKSA cache entry for " MACSTR, 253 MAC2STR(entry->spa)); 254 wpa_hexdump(MSG_DEBUG, "RSN: added PMKID", entry->pmkid, PMKID_LEN); 255 } 256 257 258 /** 259 * pmksa_cache_auth_add - Add a PMKSA cache entry 260 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init() 261 * @pmk: The new pairwise master key 262 * @pmk_len: PMK length in bytes, usually PMK_LEN (32) 263 * @pmkid: Calculated PMKID 264 * @kck: Key confirmation key or %NULL if not yet derived 265 * @kck_len: KCK length in bytes 266 * @aa: Authenticator address 267 * @spa: Supplicant address 268 * @session_timeout: Session timeout 269 * @eapol: Pointer to EAPOL state machine data 270 * @akmp: WPA_KEY_MGMT_* used in key derivation 271 * Returns: Pointer to the added PMKSA cache entry or %NULL on error 272 * 273 * This function create a PMKSA entry for a new PMK and adds it to the PMKSA 274 * cache. If an old entry is already in the cache for the same Supplicant, 275 * this entry will be replaced with the new entry. PMKID will be calculated 276 * based on the PMK. 277 */ 278 struct rsn_pmksa_cache_entry * 279 pmksa_cache_auth_add(struct rsn_pmksa_cache *pmksa, 280 const u8 *pmk, size_t pmk_len, const u8 *pmkid, 281 const u8 *kck, size_t kck_len, 282 const u8 *aa, const u8 *spa, int session_timeout, 283 struct eapol_state_machine *eapol, int akmp) 284 { 285 struct rsn_pmksa_cache_entry *entry; 286 287 entry = pmksa_cache_auth_create_entry(pmk, pmk_len, pmkid, kck, kck_len, 288 aa, spa, session_timeout, eapol, 289 akmp); 290 291 if (pmksa_cache_auth_add_entry(pmksa, entry) < 0) 292 return NULL; 293 294 return entry; 295 } 296 297 298 /** 299 * pmksa_cache_auth_create_entry - Create a PMKSA cache entry 300 * @pmk: The new pairwise master key 301 * @pmk_len: PMK length in bytes, usually PMK_LEN (32) 302 * @pmkid: Calculated PMKID 303 * @kck: Key confirmation key or %NULL if not yet derived 304 * @kck_len: KCK length in bytes 305 * @aa: Authenticator address 306 * @spa: Supplicant address 307 * @session_timeout: Session timeout 308 * @eapol: Pointer to EAPOL state machine data 309 * @akmp: WPA_KEY_MGMT_* used in key derivation 310 * Returns: Pointer to the added PMKSA cache entry or %NULL on error 311 * 312 * This function creates a PMKSA entry. 313 */ 314 struct rsn_pmksa_cache_entry * 315 pmksa_cache_auth_create_entry(const u8 *pmk, size_t pmk_len, const u8 *pmkid, 316 const u8 *kck, size_t kck_len, const u8 *aa, 317 const u8 *spa, int session_timeout, 318 struct eapol_state_machine *eapol, int akmp) 319 { 320 struct rsn_pmksa_cache_entry *entry; 321 struct os_reltime now; 322 323 if (pmk_len > PMK_LEN_MAX) 324 return NULL; 325 326 if (wpa_key_mgmt_suite_b(akmp) && !kck) 327 return NULL; 328 329 entry = os_zalloc(sizeof(*entry)); 330 if (entry == NULL) 331 return NULL; 332 os_memcpy(entry->pmk, pmk, pmk_len); 333 entry->pmk_len = pmk_len; 334 if (pmkid) 335 os_memcpy(entry->pmkid, pmkid, PMKID_LEN); 336 else if (akmp == WPA_KEY_MGMT_IEEE8021X_SUITE_B_192) 337 rsn_pmkid_suite_b_192(kck, kck_len, aa, spa, entry->pmkid); 338 else if (wpa_key_mgmt_suite_b(akmp)) 339 rsn_pmkid_suite_b(kck, kck_len, aa, spa, entry->pmkid); 340 else 341 rsn_pmkid(pmk, pmk_len, aa, spa, entry->pmkid, 342 wpa_key_mgmt_sha256(akmp)); 343 os_get_reltime(&now); 344 entry->expiration = now.sec; 345 if (session_timeout > 0) 346 entry->expiration += session_timeout; 347 else 348 entry->expiration += dot11RSNAConfigPMKLifetime; 349 entry->akmp = akmp; 350 os_memcpy(entry->spa, spa, ETH_ALEN); 351 pmksa_cache_from_eapol_data(entry, eapol); 352 353 return entry; 354 } 355 356 357 /** 358 * pmksa_cache_auth_add_entry - Add a PMKSA cache entry 359 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init() 360 * @entry: Pointer to PMKSA cache entry 361 * 362 * This function adds PMKSA cache entry to the PMKSA cache. If an old entry is 363 * already in the cache for the same Supplicant, this entry will be replaced 364 * with the new entry. PMKID will be calculated based on the PMK. 365 */ 366 int pmksa_cache_auth_add_entry(struct rsn_pmksa_cache *pmksa, 367 struct rsn_pmksa_cache_entry *entry) 368 { 369 struct rsn_pmksa_cache_entry *pos; 370 371 if (entry == NULL) 372 return -1; 373 374 /* Replace an old entry for the same STA (if found) with the new entry 375 */ 376 pos = pmksa_cache_auth_get(pmksa, entry->spa, NULL); 377 if (pos) 378 pmksa_cache_free_entry(pmksa, pos); 379 380 if (pmksa->pmksa_count >= pmksa_cache_max_entries && pmksa->pmksa) { 381 /* Remove the oldest entry to make room for the new entry */ 382 wpa_printf(MSG_DEBUG, "RSN: removed the oldest PMKSA cache " 383 "entry (for " MACSTR ") to make room for new one", 384 MAC2STR(pmksa->pmksa->spa)); 385 pmksa_cache_free_entry(pmksa, pmksa->pmksa); 386 } 387 388 pmksa_cache_link_entry(pmksa, entry); 389 390 return 0; 391 } 392 393 394 struct rsn_pmksa_cache_entry * 395 pmksa_cache_add_okc(struct rsn_pmksa_cache *pmksa, 396 const struct rsn_pmksa_cache_entry *old_entry, 397 const u8 *aa, const u8 *pmkid) 398 { 399 struct rsn_pmksa_cache_entry *entry; 400 401 entry = os_zalloc(sizeof(*entry)); 402 if (entry == NULL) 403 return NULL; 404 os_memcpy(entry->pmkid, pmkid, PMKID_LEN); 405 os_memcpy(entry->pmk, old_entry->pmk, old_entry->pmk_len); 406 entry->pmk_len = old_entry->pmk_len; 407 entry->expiration = old_entry->expiration; 408 entry->akmp = old_entry->akmp; 409 os_memcpy(entry->spa, old_entry->spa, ETH_ALEN); 410 entry->opportunistic = 1; 411 if (old_entry->identity) { 412 entry->identity = os_malloc(old_entry->identity_len); 413 if (entry->identity) { 414 entry->identity_len = old_entry->identity_len; 415 os_memcpy(entry->identity, old_entry->identity, 416 old_entry->identity_len); 417 } 418 } 419 if (old_entry->cui) 420 entry->cui = wpabuf_dup(old_entry->cui); 421 #ifndef CONFIG_NO_RADIUS 422 radius_copy_class(&entry->radius_class, &old_entry->radius_class); 423 #endif /* CONFIG_NO_RADIUS */ 424 entry->eap_type_authsrv = old_entry->eap_type_authsrv; 425 if (old_entry->vlan_desc) { 426 entry->vlan_desc = os_zalloc(sizeof(struct vlan_description)); 427 if (entry->vlan_desc) 428 *entry->vlan_desc = *old_entry->vlan_desc; 429 } else { 430 entry->vlan_desc = NULL; 431 } 432 entry->opportunistic = 1; 433 434 pmksa_cache_link_entry(pmksa, entry); 435 436 return entry; 437 } 438 439 440 /** 441 * pmksa_cache_auth_deinit - Free all entries in PMKSA cache 442 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init() 443 */ 444 void pmksa_cache_auth_deinit(struct rsn_pmksa_cache *pmksa) 445 { 446 struct rsn_pmksa_cache_entry *entry, *prev; 447 int i; 448 449 if (pmksa == NULL) 450 return; 451 452 entry = pmksa->pmksa; 453 while (entry) { 454 prev = entry; 455 entry = entry->next; 456 _pmksa_cache_free_entry(prev); 457 } 458 eloop_cancel_timeout(pmksa_cache_expire, pmksa, NULL); 459 pmksa->pmksa_count = 0; 460 pmksa->pmksa = NULL; 461 for (i = 0; i < PMKID_HASH_SIZE; i++) 462 pmksa->pmkid[i] = NULL; 463 os_free(pmksa); 464 } 465 466 467 /** 468 * pmksa_cache_auth_get - Fetch a PMKSA cache entry 469 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init() 470 * @spa: Supplicant address or %NULL to match any 471 * @pmkid: PMKID or %NULL to match any 472 * Returns: Pointer to PMKSA cache entry or %NULL if no match was found 473 */ 474 struct rsn_pmksa_cache_entry * 475 pmksa_cache_auth_get(struct rsn_pmksa_cache *pmksa, 476 const u8 *spa, const u8 *pmkid) 477 { 478 struct rsn_pmksa_cache_entry *entry; 479 480 if (pmkid) { 481 for (entry = pmksa->pmkid[PMKID_HASH(pmkid)]; entry; 482 entry = entry->hnext) { 483 if ((spa == NULL || 484 os_memcmp(entry->spa, spa, ETH_ALEN) == 0) && 485 os_memcmp(entry->pmkid, pmkid, PMKID_LEN) == 0) 486 return entry; 487 } 488 } else { 489 for (entry = pmksa->pmksa; entry; entry = entry->next) { 490 if (spa == NULL || 491 os_memcmp(entry->spa, spa, ETH_ALEN) == 0) 492 return entry; 493 } 494 } 495 496 return NULL; 497 } 498 499 500 /** 501 * pmksa_cache_get_okc - Fetch a PMKSA cache entry using OKC 502 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init() 503 * @aa: Authenticator address 504 * @spa: Supplicant address 505 * @pmkid: PMKID 506 * Returns: Pointer to PMKSA cache entry or %NULL if no match was found 507 * 508 * Use opportunistic key caching (OKC) to find a PMK for a supplicant. 509 */ 510 struct rsn_pmksa_cache_entry * pmksa_cache_get_okc( 511 struct rsn_pmksa_cache *pmksa, const u8 *aa, const u8 *spa, 512 const u8 *pmkid) 513 { 514 struct rsn_pmksa_cache_entry *entry; 515 u8 new_pmkid[PMKID_LEN]; 516 517 for (entry = pmksa->pmksa; entry; entry = entry->next) { 518 if (os_memcmp(entry->spa, spa, ETH_ALEN) != 0) 519 continue; 520 rsn_pmkid(entry->pmk, entry->pmk_len, aa, spa, new_pmkid, 521 wpa_key_mgmt_sha256(entry->akmp)); 522 if (os_memcmp(new_pmkid, pmkid, PMKID_LEN) == 0) 523 return entry; 524 } 525 return NULL; 526 } 527 528 529 /** 530 * pmksa_cache_auth_init - Initialize PMKSA cache 531 * @free_cb: Callback function to be called when a PMKSA cache entry is freed 532 * @ctx: Context pointer for free_cb function 533 * Returns: Pointer to PMKSA cache data or %NULL on failure 534 */ 535 struct rsn_pmksa_cache * 536 pmksa_cache_auth_init(void (*free_cb)(struct rsn_pmksa_cache_entry *entry, 537 void *ctx), void *ctx) 538 { 539 struct rsn_pmksa_cache *pmksa; 540 541 pmksa = os_zalloc(sizeof(*pmksa)); 542 if (pmksa) { 543 pmksa->free_cb = free_cb; 544 pmksa->ctx = ctx; 545 } 546 547 return pmksa; 548 } 549 550 551 static int das_attr_match(struct rsn_pmksa_cache_entry *entry, 552 struct radius_das_attrs *attr) 553 { 554 int match = 0; 555 556 if (attr->sta_addr) { 557 if (os_memcmp(attr->sta_addr, entry->spa, ETH_ALEN) != 0) 558 return 0; 559 match++; 560 } 561 562 if (attr->acct_multi_session_id) { 563 char buf[20]; 564 565 if (attr->acct_multi_session_id_len != 16) 566 return 0; 567 os_snprintf(buf, sizeof(buf), "%016llX", 568 (unsigned long long) entry->acct_multi_session_id); 569 if (os_memcmp(attr->acct_multi_session_id, buf, 16) != 0) 570 return 0; 571 match++; 572 } 573 574 if (attr->cui) { 575 if (!entry->cui || 576 attr->cui_len != wpabuf_len(entry->cui) || 577 os_memcmp(attr->cui, wpabuf_head(entry->cui), 578 attr->cui_len) != 0) 579 return 0; 580 match++; 581 } 582 583 if (attr->user_name) { 584 if (!entry->identity || 585 attr->user_name_len != entry->identity_len || 586 os_memcmp(attr->user_name, entry->identity, 587 attr->user_name_len) != 0) 588 return 0; 589 match++; 590 } 591 592 return match; 593 } 594 595 596 int pmksa_cache_auth_radius_das_disconnect(struct rsn_pmksa_cache *pmksa, 597 struct radius_das_attrs *attr) 598 { 599 int found = 0; 600 struct rsn_pmksa_cache_entry *entry, *prev; 601 602 if (attr->acct_session_id) 603 return -1; 604 605 entry = pmksa->pmksa; 606 while (entry) { 607 if (das_attr_match(entry, attr)) { 608 found++; 609 prev = entry; 610 entry = entry->next; 611 pmksa_cache_free_entry(pmksa, prev); 612 continue; 613 } 614 entry = entry->next; 615 } 616 617 return found ? 0 : -1; 618 } 619 620 621 /** 622 * pmksa_cache_auth_list - Dump text list of entries in PMKSA cache 623 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init() 624 * @buf: Buffer for the list 625 * @len: Length of the buffer 626 * Returns: Number of bytes written to buffer 627 * 628 * This function is used to generate a text format representation of the 629 * current PMKSA cache contents for the ctrl_iface PMKSA command. 630 */ 631 int pmksa_cache_auth_list(struct rsn_pmksa_cache *pmksa, char *buf, size_t len) 632 { 633 int i, ret; 634 char *pos = buf; 635 struct rsn_pmksa_cache_entry *entry; 636 struct os_reltime now; 637 638 os_get_reltime(&now); 639 ret = os_snprintf(pos, buf + len - pos, 640 "Index / SPA / PMKID / expiration (in seconds) / opportunistic\n"); 641 if (os_snprintf_error(buf + len - pos, ret)) 642 return pos - buf; 643 pos += ret; 644 i = 0; 645 entry = pmksa->pmksa; 646 while (entry) { 647 ret = os_snprintf(pos, buf + len - pos, "%d " MACSTR " ", 648 i, MAC2STR(entry->spa)); 649 if (os_snprintf_error(buf + len - pos, ret)) 650 return pos - buf; 651 pos += ret; 652 pos += wpa_snprintf_hex(pos, buf + len - pos, entry->pmkid, 653 PMKID_LEN); 654 ret = os_snprintf(pos, buf + len - pos, " %d %d\n", 655 (int) (entry->expiration - now.sec), 656 entry->opportunistic); 657 if (os_snprintf_error(buf + len - pos, ret)) 658 return pos - buf; 659 pos += ret; 660 entry = entry->next; 661 } 662 return pos - buf; 663 } 664 665 666 #ifdef CONFIG_PMKSA_CACHE_EXTERNAL 667 #ifdef CONFIG_MESH 668 669 /** 670 * pmksa_cache_auth_list_mesh - Dump text list of entries in PMKSA cache 671 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init() 672 * @addr: MAC address of the peer (NULL means any) 673 * @buf: Buffer for the list 674 * @len: Length of the buffer 675 * Returns: Number of bytes written to buffer 676 * 677 * This function is used to generate a text format representation of the 678 * current PMKSA cache contents for the ctrl_iface PMKSA_GET command to store 679 * in external storage. 680 */ 681 int pmksa_cache_auth_list_mesh(struct rsn_pmksa_cache *pmksa, const u8 *addr, 682 char *buf, size_t len) 683 { 684 int ret; 685 char *pos, *end; 686 struct rsn_pmksa_cache_entry *entry; 687 struct os_reltime now; 688 689 pos = buf; 690 end = buf + len; 691 os_get_reltime(&now); 692 693 694 /* 695 * Entry format: 696 * <BSSID> <PMKID> <PMK> <expiration in seconds> 697 */ 698 for (entry = pmksa->pmksa; entry; entry = entry->next) { 699 if (addr && os_memcmp(entry->spa, addr, ETH_ALEN) != 0) 700 continue; 701 702 ret = os_snprintf(pos, end - pos, MACSTR " ", 703 MAC2STR(entry->spa)); 704 if (os_snprintf_error(end - pos, ret)) 705 return 0; 706 pos += ret; 707 708 pos += wpa_snprintf_hex(pos, end - pos, entry->pmkid, 709 PMKID_LEN); 710 711 ret = os_snprintf(pos, end - pos, " "); 712 if (os_snprintf_error(end - pos, ret)) 713 return 0; 714 pos += ret; 715 716 pos += wpa_snprintf_hex(pos, end - pos, entry->pmk, 717 entry->pmk_len); 718 719 ret = os_snprintf(pos, end - pos, " %d\n", 720 (int) (entry->expiration - now.sec)); 721 if (os_snprintf_error(end - pos, ret)) 722 return 0; 723 pos += ret; 724 } 725 726 return pos - buf; 727 } 728 729 #endif /* CONFIG_MESH */ 730 #endif /* CONFIG_PMKSA_CACHE_EXTERNAL */ 731
