1 /* 2 * hostapd - PMKSA cache for IEEE 802.11i RSN 3 * Copyright (c) 2004-2008, 2012-2015, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "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 os_free(entry->dpp_pkhash); 44 wpabuf_free(entry->cui); 45 #ifndef CONFIG_NO_RADIUS 46 radius_free_class(&entry->radius_class); 47 #endif /* CONFIG_NO_RADIUS */ 48 bin_clear_free(entry, sizeof(*entry)); 49 } 50 51 52 void pmksa_cache_free_entry(struct rsn_pmksa_cache *pmksa, 53 struct rsn_pmksa_cache_entry *entry) 54 { 55 struct rsn_pmksa_cache_entry *pos, *prev; 56 unsigned int hash; 57 58 pmksa->pmksa_count--; 59 60 if (pmksa->free_cb) 61 pmksa->free_cb(entry, pmksa->ctx); 62 63 /* unlink from hash list */ 64 hash = PMKID_HASH(entry->pmkid); 65 pos = pmksa->pmkid[hash]; 66 prev = NULL; 67 while (pos) { 68 if (pos == entry) { 69 if (prev != NULL) 70 prev->hnext = entry->hnext; 71 else 72 pmksa->pmkid[hash] = entry->hnext; 73 break; 74 } 75 prev = pos; 76 pos = pos->hnext; 77 } 78 79 /* unlink from entry list */ 80 pos = pmksa->pmksa; 81 prev = NULL; 82 while (pos) { 83 if (pos == entry) { 84 if (prev != NULL) 85 prev->next = entry->next; 86 else 87 pmksa->pmksa = entry->next; 88 break; 89 } 90 prev = pos; 91 pos = pos->next; 92 } 93 94 _pmksa_cache_free_entry(entry); 95 } 96 97 98 /** 99 * pmksa_cache_auth_flush - Flush all PMKSA cache entries 100 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init() 101 */ 102 void pmksa_cache_auth_flush(struct rsn_pmksa_cache *pmksa) 103 { 104 while (pmksa->pmksa) { 105 wpa_printf(MSG_DEBUG, "RSN: Flush PMKSA cache entry for " 106 MACSTR, MAC2STR(pmksa->pmksa->spa)); 107 pmksa_cache_free_entry(pmksa, pmksa->pmksa); 108 } 109 } 110 111 112 static void pmksa_cache_expire(void *eloop_ctx, void *timeout_ctx) 113 { 114 struct rsn_pmksa_cache *pmksa = eloop_ctx; 115 struct os_reltime now; 116 117 os_get_reltime(&now); 118 while (pmksa->pmksa && pmksa->pmksa->expiration <= now.sec) { 119 wpa_printf(MSG_DEBUG, "RSN: expired PMKSA cache entry for " 120 MACSTR, MAC2STR(pmksa->pmksa->spa)); 121 pmksa_cache_free_entry(pmksa, pmksa->pmksa); 122 } 123 124 pmksa_cache_set_expiration(pmksa); 125 } 126 127 128 static void pmksa_cache_set_expiration(struct rsn_pmksa_cache *pmksa) 129 { 130 int sec; 131 struct os_reltime now; 132 133 eloop_cancel_timeout(pmksa_cache_expire, pmksa, NULL); 134 if (pmksa->pmksa == NULL) 135 return; 136 os_get_reltime(&now); 137 sec = pmksa->pmksa->expiration - now.sec; 138 if (sec < 0) 139 sec = 0; 140 eloop_register_timeout(sec + 1, 0, pmksa_cache_expire, pmksa, NULL); 141 } 142 143 144 static void pmksa_cache_from_eapol_data(struct rsn_pmksa_cache_entry *entry, 145 struct eapol_state_machine *eapol) 146 { 147 struct vlan_description *vlan_desc; 148 149 if (eapol == NULL) 150 return; 151 152 if (eapol->identity) { 153 entry->identity = os_malloc(eapol->identity_len); 154 if (entry->identity) { 155 entry->identity_len = eapol->identity_len; 156 os_memcpy(entry->identity, eapol->identity, 157 eapol->identity_len); 158 } 159 } 160 161 if (eapol->radius_cui) 162 entry->cui = wpabuf_dup(eapol->radius_cui); 163 164 #ifndef CONFIG_NO_RADIUS 165 radius_copy_class(&entry->radius_class, &eapol->radius_class); 166 #endif /* CONFIG_NO_RADIUS */ 167 168 entry->eap_type_authsrv = eapol->eap_type_authsrv; 169 170 vlan_desc = ((struct sta_info *) eapol->sta)->vlan_desc; 171 if (vlan_desc && vlan_desc->notempty) { 172 entry->vlan_desc = os_zalloc(sizeof(struct vlan_description)); 173 if (entry->vlan_desc) 174 *entry->vlan_desc = *vlan_desc; 175 } else { 176 entry->vlan_desc = NULL; 177 } 178 179 entry->acct_multi_session_id = eapol->acct_multi_session_id; 180 } 181 182 183 void pmksa_cache_to_eapol_data(struct hostapd_data *hapd, 184 struct rsn_pmksa_cache_entry *entry, 185 struct eapol_state_machine *eapol) 186 { 187 if (entry == NULL || eapol == NULL) 188 return; 189 190 if (entry->identity) { 191 os_free(eapol->identity); 192 eapol->identity = os_malloc(entry->identity_len); 193 if (eapol->identity) { 194 eapol->identity_len = entry->identity_len; 195 os_memcpy(eapol->identity, entry->identity, 196 entry->identity_len); 197 } 198 wpa_hexdump_ascii(MSG_DEBUG, "STA identity from PMKSA", 199 eapol->identity, eapol->identity_len); 200 } 201 202 if (entry->cui) { 203 wpabuf_free(eapol->radius_cui); 204 eapol->radius_cui = wpabuf_dup(entry->cui); 205 } 206 207 #ifndef CONFIG_NO_RADIUS 208 radius_free_class(&eapol->radius_class); 209 radius_copy_class(&eapol->radius_class, &entry->radius_class); 210 #endif /* CONFIG_NO_RADIUS */ 211 if (eapol->radius_class.attr) { 212 wpa_printf(MSG_DEBUG, "Copied %lu Class attribute(s) from " 213 "PMKSA", (unsigned long) eapol->radius_class.count); 214 } 215 216 eapol->eap_type_authsrv = entry->eap_type_authsrv; 217 #ifndef CONFIG_NO_VLAN 218 ap_sta_set_vlan(hapd, eapol->sta, entry->vlan_desc); 219 #endif /* CONFIG_NO_VLAN */ 220 221 eapol->acct_multi_session_id = entry->acct_multi_session_id; 222 } 223 224 225 static void pmksa_cache_link_entry(struct rsn_pmksa_cache *pmksa, 226 struct rsn_pmksa_cache_entry *entry) 227 { 228 struct rsn_pmksa_cache_entry *pos, *prev; 229 int hash; 230 231 /* Add the new entry; order by expiration time */ 232 pos = pmksa->pmksa; 233 prev = NULL; 234 while (pos) { 235 if (pos->expiration > entry->expiration) 236 break; 237 prev = pos; 238 pos = pos->next; 239 } 240 if (prev == NULL) { 241 entry->next = pmksa->pmksa; 242 pmksa->pmksa = entry; 243 } else { 244 entry->next = prev->next; 245 prev->next = entry; 246 } 247 248 hash = PMKID_HASH(entry->pmkid); 249 entry->hnext = pmksa->pmkid[hash]; 250 pmksa->pmkid[hash] = entry; 251 252 pmksa->pmksa_count++; 253 if (prev == NULL) 254 pmksa_cache_set_expiration(pmksa); 255 wpa_printf(MSG_DEBUG, "RSN: added PMKSA cache entry for " MACSTR, 256 MAC2STR(entry->spa)); 257 wpa_hexdump(MSG_DEBUG, "RSN: added PMKID", entry->pmkid, PMKID_LEN); 258 } 259 260 261 /** 262 * pmksa_cache_auth_add - Add a PMKSA cache entry 263 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init() 264 * @pmk: The new pairwise master key 265 * @pmk_len: PMK length in bytes, usually PMK_LEN (32) 266 * @pmkid: Calculated PMKID 267 * @kck: Key confirmation key or %NULL if not yet derived 268 * @kck_len: KCK length in bytes 269 * @aa: Authenticator address 270 * @spa: Supplicant address 271 * @session_timeout: Session timeout 272 * @eapol: Pointer to EAPOL state machine data 273 * @akmp: WPA_KEY_MGMT_* used in key derivation 274 * Returns: Pointer to the added PMKSA cache entry or %NULL on error 275 * 276 * This function create a PMKSA entry for a new PMK and adds it to the PMKSA 277 * cache. If an old entry is already in the cache for the same Supplicant, 278 * this entry will be replaced with the new entry. PMKID will be calculated 279 * based on the PMK. 280 */ 281 struct rsn_pmksa_cache_entry * 282 pmksa_cache_auth_add(struct rsn_pmksa_cache *pmksa, 283 const u8 *pmk, size_t pmk_len, const u8 *pmkid, 284 const u8 *kck, size_t kck_len, 285 const u8 *aa, const u8 *spa, int session_timeout, 286 struct eapol_state_machine *eapol, int akmp) 287 { 288 struct rsn_pmksa_cache_entry *entry; 289 290 entry = pmksa_cache_auth_create_entry(pmk, pmk_len, pmkid, kck, kck_len, 291 aa, spa, session_timeout, eapol, 292 akmp); 293 294 if (pmksa_cache_auth_add_entry(pmksa, entry) < 0) 295 return NULL; 296 297 return entry; 298 } 299 300 301 /** 302 * pmksa_cache_auth_create_entry - Create a PMKSA cache entry 303 * @pmk: The new pairwise master key 304 * @pmk_len: PMK length in bytes, usually PMK_LEN (32) 305 * @pmkid: Calculated PMKID 306 * @kck: Key confirmation key or %NULL if not yet derived 307 * @kck_len: KCK length in bytes 308 * @aa: Authenticator address 309 * @spa: Supplicant address 310 * @session_timeout: Session timeout 311 * @eapol: Pointer to EAPOL state machine data 312 * @akmp: WPA_KEY_MGMT_* used in key derivation 313 * Returns: Pointer to the added PMKSA cache entry or %NULL on error 314 * 315 * This function creates a PMKSA entry. 316 */ 317 struct rsn_pmksa_cache_entry * 318 pmksa_cache_auth_create_entry(const u8 *pmk, size_t pmk_len, const u8 *pmkid, 319 const u8 *kck, size_t kck_len, const u8 *aa, 320 const u8 *spa, int session_timeout, 321 struct eapol_state_machine *eapol, int akmp) 322 { 323 struct rsn_pmksa_cache_entry *entry; 324 struct os_reltime now; 325 326 if (pmk_len > PMK_LEN_MAX) 327 return NULL; 328 329 if (wpa_key_mgmt_suite_b(akmp) && !kck) 330 return NULL; 331 332 entry = os_zalloc(sizeof(*entry)); 333 if (entry == NULL) 334 return NULL; 335 os_memcpy(entry->pmk, pmk, pmk_len); 336 entry->pmk_len = pmk_len; 337 if (kck && kck_len && kck_len < WPA_KCK_MAX_LEN) { 338 os_memcpy(entry->kck, kck, kck_len); 339 entry->kck_len = kck_len; 340 } 341 if (pmkid) 342 os_memcpy(entry->pmkid, pmkid, PMKID_LEN); 343 else if (akmp == WPA_KEY_MGMT_IEEE8021X_SUITE_B_192) 344 rsn_pmkid_suite_b_192(kck, kck_len, aa, spa, entry->pmkid); 345 else if (wpa_key_mgmt_suite_b(akmp)) 346 rsn_pmkid_suite_b(kck, kck_len, aa, spa, entry->pmkid); 347 else 348 rsn_pmkid(pmk, pmk_len, aa, spa, entry->pmkid, akmp); 349 os_get_reltime(&now); 350 entry->expiration = now.sec; 351 if (session_timeout > 0) 352 entry->expiration += session_timeout; 353 else 354 entry->expiration += dot11RSNAConfigPMKLifetime; 355 entry->akmp = akmp; 356 os_memcpy(entry->spa, spa, ETH_ALEN); 357 pmksa_cache_from_eapol_data(entry, eapol); 358 359 return entry; 360 } 361 362 363 /** 364 * pmksa_cache_auth_add_entry - Add a PMKSA cache entry 365 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init() 366 * @entry: Pointer to PMKSA cache entry 367 * 368 * This function adds PMKSA cache entry to the PMKSA cache. If an old entry is 369 * already in the cache for the same Supplicant, this entry will be replaced 370 * with the new entry. PMKID will be calculated based on the PMK. 371 */ 372 int pmksa_cache_auth_add_entry(struct rsn_pmksa_cache *pmksa, 373 struct rsn_pmksa_cache_entry *entry) 374 { 375 struct rsn_pmksa_cache_entry *pos; 376 377 if (entry == NULL) 378 return -1; 379 380 /* Replace an old entry for the same STA (if found) with the new entry 381 */ 382 pos = pmksa_cache_auth_get(pmksa, entry->spa, NULL); 383 if (pos) 384 pmksa_cache_free_entry(pmksa, pos); 385 386 if (pmksa->pmksa_count >= pmksa_cache_max_entries && pmksa->pmksa) { 387 /* Remove the oldest entry to make room for the new entry */ 388 wpa_printf(MSG_DEBUG, "RSN: removed the oldest PMKSA cache " 389 "entry (for " MACSTR ") to make room for new one", 390 MAC2STR(pmksa->pmksa->spa)); 391 pmksa_cache_free_entry(pmksa, pmksa->pmksa); 392 } 393 394 pmksa_cache_link_entry(pmksa, entry); 395 396 return 0; 397 } 398 399 400 struct rsn_pmksa_cache_entry * 401 pmksa_cache_add_okc(struct rsn_pmksa_cache *pmksa, 402 const struct rsn_pmksa_cache_entry *old_entry, 403 const u8 *aa, const u8 *pmkid) 404 { 405 struct rsn_pmksa_cache_entry *entry; 406 407 entry = os_zalloc(sizeof(*entry)); 408 if (entry == NULL) 409 return NULL; 410 os_memcpy(entry->pmkid, pmkid, PMKID_LEN); 411 os_memcpy(entry->pmk, old_entry->pmk, old_entry->pmk_len); 412 entry->pmk_len = old_entry->pmk_len; 413 entry->expiration = old_entry->expiration; 414 entry->akmp = old_entry->akmp; 415 os_memcpy(entry->spa, old_entry->spa, ETH_ALEN); 416 entry->opportunistic = 1; 417 if (old_entry->identity) { 418 entry->identity = os_malloc(old_entry->identity_len); 419 if (entry->identity) { 420 entry->identity_len = old_entry->identity_len; 421 os_memcpy(entry->identity, old_entry->identity, 422 old_entry->identity_len); 423 } 424 } 425 if (old_entry->cui) 426 entry->cui = wpabuf_dup(old_entry->cui); 427 #ifndef CONFIG_NO_RADIUS 428 radius_copy_class(&entry->radius_class, &old_entry->radius_class); 429 #endif /* CONFIG_NO_RADIUS */ 430 entry->eap_type_authsrv = old_entry->eap_type_authsrv; 431 if (old_entry->vlan_desc) { 432 entry->vlan_desc = os_zalloc(sizeof(struct vlan_description)); 433 if (entry->vlan_desc) 434 *entry->vlan_desc = *old_entry->vlan_desc; 435 } else { 436 entry->vlan_desc = NULL; 437 } 438 entry->opportunistic = 1; 439 440 pmksa_cache_link_entry(pmksa, entry); 441 442 return entry; 443 } 444 445 446 /** 447 * pmksa_cache_auth_deinit - Free all entries in PMKSA cache 448 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init() 449 */ 450 void pmksa_cache_auth_deinit(struct rsn_pmksa_cache *pmksa) 451 { 452 struct rsn_pmksa_cache_entry *entry, *prev; 453 int i; 454 455 if (pmksa == NULL) 456 return; 457 458 entry = pmksa->pmksa; 459 while (entry) { 460 prev = entry; 461 entry = entry->next; 462 _pmksa_cache_free_entry(prev); 463 } 464 eloop_cancel_timeout(pmksa_cache_expire, pmksa, NULL); 465 pmksa->pmksa_count = 0; 466 pmksa->pmksa = NULL; 467 for (i = 0; i < PMKID_HASH_SIZE; i++) 468 pmksa->pmkid[i] = NULL; 469 os_free(pmksa); 470 } 471 472 473 /** 474 * pmksa_cache_auth_get - Fetch a PMKSA cache entry 475 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init() 476 * @spa: Supplicant address or %NULL to match any 477 * @pmkid: PMKID or %NULL to match any 478 * Returns: Pointer to PMKSA cache entry or %NULL if no match was found 479 */ 480 struct rsn_pmksa_cache_entry * 481 pmksa_cache_auth_get(struct rsn_pmksa_cache *pmksa, 482 const u8 *spa, const u8 *pmkid) 483 { 484 struct rsn_pmksa_cache_entry *entry; 485 486 if (pmkid) { 487 for (entry = pmksa->pmkid[PMKID_HASH(pmkid)]; entry; 488 entry = entry->hnext) { 489 if ((spa == NULL || 490 ether_addr_equal(entry->spa, spa)) && 491 os_memcmp(entry->pmkid, pmkid, PMKID_LEN) == 0) 492 return entry; 493 } 494 } else { 495 for (entry = pmksa->pmksa; entry; entry = entry->next) { 496 if (spa == NULL || 497 ether_addr_equal(entry->spa, spa)) 498 return entry; 499 } 500 } 501 502 return NULL; 503 } 504 505 506 /** 507 * pmksa_cache_get_okc - Fetch a PMKSA cache entry using OKC 508 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init() 509 * @aa: Authenticator address 510 * @spa: Supplicant address 511 * @pmkid: PMKID 512 * Returns: Pointer to PMKSA cache entry or %NULL if no match was found 513 * 514 * Use opportunistic key caching (OKC) to find a PMK for a supplicant. 515 */ 516 struct rsn_pmksa_cache_entry * pmksa_cache_get_okc( 517 struct rsn_pmksa_cache *pmksa, const u8 *aa, const u8 *spa, 518 const u8 *pmkid) 519 { 520 struct rsn_pmksa_cache_entry *entry; 521 u8 new_pmkid[PMKID_LEN]; 522 523 for (entry = pmksa->pmksa; entry; entry = entry->next) { 524 if (!ether_addr_equal(entry->spa, spa)) 525 continue; 526 if (wpa_key_mgmt_sae(entry->akmp) || 527 wpa_key_mgmt_fils(entry->akmp)) { 528 if (os_memcmp(entry->pmkid, pmkid, PMKID_LEN) == 0) 529 return entry; 530 continue; 531 } 532 if (entry->akmp == WPA_KEY_MGMT_IEEE8021X_SUITE_B_192 && 533 entry->kck_len > 0) 534 rsn_pmkid_suite_b_192(entry->kck, entry->kck_len, 535 aa, spa, new_pmkid); 536 else if (wpa_key_mgmt_suite_b(entry->akmp) && 537 entry->kck_len > 0) 538 rsn_pmkid_suite_b(entry->kck, entry->kck_len, aa, spa, 539 new_pmkid); 540 else 541 rsn_pmkid(entry->pmk, entry->pmk_len, aa, spa, 542 new_pmkid, entry->akmp); 543 if (os_memcmp(new_pmkid, pmkid, PMKID_LEN) == 0) 544 return entry; 545 } 546 return NULL; 547 } 548 549 550 /** 551 * pmksa_cache_auth_init - Initialize PMKSA cache 552 * @free_cb: Callback function to be called when a PMKSA cache entry is freed 553 * @ctx: Context pointer for free_cb function 554 * Returns: Pointer to PMKSA cache data or %NULL on failure 555 */ 556 struct rsn_pmksa_cache * 557 pmksa_cache_auth_init(void (*free_cb)(struct rsn_pmksa_cache_entry *entry, 558 void *ctx), void *ctx) 559 { 560 struct rsn_pmksa_cache *pmksa; 561 562 pmksa = os_zalloc(sizeof(*pmksa)); 563 if (pmksa) { 564 pmksa->free_cb = free_cb; 565 pmksa->ctx = ctx; 566 } 567 568 return pmksa; 569 } 570 571 572 static int das_attr_match(struct rsn_pmksa_cache_entry *entry, 573 struct radius_das_attrs *attr) 574 { 575 int match = 0; 576 577 if (attr->sta_addr) { 578 if (!ether_addr_equal(attr->sta_addr, entry->spa)) 579 return 0; 580 match++; 581 } 582 583 if (attr->acct_multi_session_id) { 584 char buf[20]; 585 586 if (attr->acct_multi_session_id_len != 16) 587 return 0; 588 os_snprintf(buf, sizeof(buf), "%016llX", 589 (unsigned long long) entry->acct_multi_session_id); 590 if (os_memcmp(attr->acct_multi_session_id, buf, 16) != 0) 591 return 0; 592 match++; 593 } 594 595 if (attr->cui) { 596 if (!entry->cui || 597 attr->cui_len != wpabuf_len(entry->cui) || 598 os_memcmp(attr->cui, wpabuf_head(entry->cui), 599 attr->cui_len) != 0) 600 return 0; 601 match++; 602 } 603 604 if (attr->user_name) { 605 if (!entry->identity || 606 attr->user_name_len != entry->identity_len || 607 os_memcmp(attr->user_name, entry->identity, 608 attr->user_name_len) != 0) 609 return 0; 610 match++; 611 } 612 613 return match; 614 } 615 616 617 int pmksa_cache_auth_radius_das_disconnect(struct rsn_pmksa_cache *pmksa, 618 struct radius_das_attrs *attr) 619 { 620 int found = 0; 621 struct rsn_pmksa_cache_entry *entry, *prev; 622 623 if (attr->acct_session_id) 624 return -1; 625 626 entry = pmksa->pmksa; 627 while (entry) { 628 if (das_attr_match(entry, attr)) { 629 found++; 630 prev = entry; 631 entry = entry->next; 632 pmksa_cache_free_entry(pmksa, prev); 633 continue; 634 } 635 entry = entry->next; 636 } 637 638 return found ? 0 : -1; 639 } 640 641 642 /** 643 * pmksa_cache_auth_list - Dump text list of entries in PMKSA cache 644 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init() 645 * @buf: Buffer for the list 646 * @len: Length of the buffer 647 * Returns: Number of bytes written to buffer 648 * 649 * This function is used to generate a text format representation of the 650 * current PMKSA cache contents for the ctrl_iface PMKSA command. 651 */ 652 int pmksa_cache_auth_list(struct rsn_pmksa_cache *pmksa, char *buf, size_t len) 653 { 654 int i, ret; 655 char *pos = buf; 656 struct rsn_pmksa_cache_entry *entry; 657 struct os_reltime now; 658 659 os_get_reltime(&now); 660 ret = os_snprintf(pos, buf + len - pos, 661 "Index / SPA / PMKID / expiration (in seconds) / opportunistic\n"); 662 if (os_snprintf_error(buf + len - pos, ret)) 663 return pos - buf; 664 pos += ret; 665 i = 0; 666 entry = pmksa->pmksa; 667 while (entry) { 668 ret = os_snprintf(pos, buf + len - pos, "%d " MACSTR " ", 669 i, MAC2STR(entry->spa)); 670 if (os_snprintf_error(buf + len - pos, ret)) 671 return pos - buf; 672 pos += ret; 673 pos += wpa_snprintf_hex(pos, buf + len - pos, entry->pmkid, 674 PMKID_LEN); 675 ret = os_snprintf(pos, buf + len - pos, " %d %d\n", 676 (int) (entry->expiration - now.sec), 677 entry->opportunistic); 678 if (os_snprintf_error(buf + len - pos, ret)) 679 return pos - buf; 680 pos += ret; 681 entry = entry->next; 682 } 683 return pos - buf; 684 } 685 686 687 #ifdef CONFIG_PMKSA_CACHE_EXTERNAL 688 #ifdef CONFIG_MESH 689 690 /** 691 * pmksa_cache_auth_list_mesh - Dump text list of entries in PMKSA cache 692 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init() 693 * @addr: MAC address of the peer (NULL means any) 694 * @buf: Buffer for the list 695 * @len: Length of the buffer 696 * Returns: Number of bytes written to buffer 697 * 698 * This function is used to generate a text format representation of the 699 * current PMKSA cache contents for the ctrl_iface PMKSA_GET command to store 700 * in external storage. 701 */ 702 int pmksa_cache_auth_list_mesh(struct rsn_pmksa_cache *pmksa, const u8 *addr, 703 char *buf, size_t len) 704 { 705 int ret; 706 char *pos, *end; 707 struct rsn_pmksa_cache_entry *entry; 708 struct os_reltime now; 709 710 pos = buf; 711 end = buf + len; 712 os_get_reltime(&now); 713 714 715 /* 716 * Entry format: 717 * <BSSID> <PMKID> <PMK> <expiration in seconds> 718 */ 719 for (entry = pmksa->pmksa; entry; entry = entry->next) { 720 if (addr && !ether_addr_equal(entry->spa, addr)) 721 continue; 722 723 ret = os_snprintf(pos, end - pos, MACSTR " ", 724 MAC2STR(entry->spa)); 725 if (os_snprintf_error(end - pos, ret)) 726 return 0; 727 pos += ret; 728 729 pos += wpa_snprintf_hex(pos, end - pos, entry->pmkid, 730 PMKID_LEN); 731 732 ret = os_snprintf(pos, end - pos, " "); 733 if (os_snprintf_error(end - pos, ret)) 734 return 0; 735 pos += ret; 736 737 pos += wpa_snprintf_hex(pos, end - pos, entry->pmk, 738 entry->pmk_len); 739 740 ret = os_snprintf(pos, end - pos, " %d\n", 741 (int) (entry->expiration - now.sec)); 742 if (os_snprintf_error(end - pos, ret)) 743 return 0; 744 pos += ret; 745 } 746 747 return pos - buf; 748 } 749 750 #endif /* CONFIG_MESH */ 751 #endif /* CONFIG_PMKSA_CACHE_EXTERNAL */ 752