1 /* 2 * RADIUS message processing 3 * Copyright (c) 2002-2009, 2011-2014, 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/wpabuf.h" 13 #include "crypto/md5.h" 14 #include "crypto/crypto.h" 15 #include "radius.h" 16 17 18 /** 19 * struct radius_msg - RADIUS message structure for new and parsed messages 20 */ 21 struct radius_msg { 22 /** 23 * buf - Allocated buffer for RADIUS message 24 */ 25 struct wpabuf *buf; 26 27 /** 28 * hdr - Pointer to the RADIUS header in buf 29 */ 30 struct radius_hdr *hdr; 31 32 /** 33 * attr_pos - Array of indexes to attributes 34 * 35 * The values are number of bytes from buf to the beginning of 36 * struct radius_attr_hdr. 37 */ 38 size_t *attr_pos; 39 40 /** 41 * attr_size - Total size of the attribute pointer array 42 */ 43 size_t attr_size; 44 45 /** 46 * attr_used - Total number of attributes in the array 47 */ 48 size_t attr_used; 49 }; 50 51 52 struct radius_hdr * radius_msg_get_hdr(struct radius_msg *msg) 53 { 54 return msg->hdr; 55 } 56 57 58 struct wpabuf * radius_msg_get_buf(struct radius_msg *msg) 59 { 60 return msg->buf; 61 } 62 63 64 static struct radius_attr_hdr * 65 radius_get_attr_hdr(struct radius_msg *msg, int idx) 66 { 67 return (struct radius_attr_hdr *) 68 (wpabuf_mhead_u8(msg->buf) + msg->attr_pos[idx]); 69 } 70 71 72 static void radius_msg_set_hdr(struct radius_msg *msg, u8 code, u8 identifier) 73 { 74 msg->hdr->code = code; 75 msg->hdr->identifier = identifier; 76 } 77 78 79 static int radius_msg_initialize(struct radius_msg *msg) 80 { 81 msg->attr_pos = os_calloc(RADIUS_DEFAULT_ATTR_COUNT, 82 sizeof(*msg->attr_pos)); 83 if (msg->attr_pos == NULL) 84 return -1; 85 86 msg->attr_size = RADIUS_DEFAULT_ATTR_COUNT; 87 msg->attr_used = 0; 88 89 return 0; 90 } 91 92 93 /** 94 * radius_msg_new - Create a new RADIUS message 95 * @code: Code for RADIUS header 96 * @identifier: Identifier for RADIUS header 97 * Returns: Context for RADIUS message or %NULL on failure 98 * 99 * The caller is responsible for freeing the returned data with 100 * radius_msg_free(). 101 */ 102 struct radius_msg * radius_msg_new(u8 code, u8 identifier) 103 { 104 struct radius_msg *msg; 105 106 msg = os_zalloc(sizeof(*msg)); 107 if (msg == NULL) 108 return NULL; 109 110 msg->buf = wpabuf_alloc(RADIUS_DEFAULT_MSG_SIZE); 111 if (msg->buf == NULL || radius_msg_initialize(msg)) { 112 radius_msg_free(msg); 113 return NULL; 114 } 115 msg->hdr = wpabuf_put(msg->buf, sizeof(struct radius_hdr)); 116 117 radius_msg_set_hdr(msg, code, identifier); 118 119 return msg; 120 } 121 122 123 /** 124 * radius_msg_free - Free a RADIUS message 125 * @msg: RADIUS message from radius_msg_new() or radius_msg_parse() 126 */ 127 void radius_msg_free(struct radius_msg *msg) 128 { 129 if (msg == NULL) 130 return; 131 132 wpabuf_free(msg->buf); 133 os_free(msg->attr_pos); 134 os_free(msg); 135 } 136 137 138 static const char *radius_code_string(u8 code) 139 { 140 switch (code) { 141 case RADIUS_CODE_ACCESS_REQUEST: return "Access-Request"; 142 case RADIUS_CODE_ACCESS_ACCEPT: return "Access-Accept"; 143 case RADIUS_CODE_ACCESS_REJECT: return "Access-Reject"; 144 case RADIUS_CODE_ACCOUNTING_REQUEST: return "Accounting-Request"; 145 case RADIUS_CODE_ACCOUNTING_RESPONSE: return "Accounting-Response"; 146 case RADIUS_CODE_ACCESS_CHALLENGE: return "Access-Challenge"; 147 case RADIUS_CODE_STATUS_SERVER: return "Status-Server"; 148 case RADIUS_CODE_STATUS_CLIENT: return "Status-Client"; 149 case RADIUS_CODE_RESERVED: return "Reserved"; 150 case RADIUS_CODE_DISCONNECT_REQUEST: return "Disconnect-Request"; 151 case RADIUS_CODE_DISCONNECT_ACK: return "Disconnect-ACK"; 152 case RADIUS_CODE_DISCONNECT_NAK: return "Disconnect-NAK"; 153 case RADIUS_CODE_COA_REQUEST: return "CoA-Request"; 154 case RADIUS_CODE_COA_ACK: return "CoA-ACK"; 155 case RADIUS_CODE_COA_NAK: return "CoA-NAK"; 156 default: return "?Unknown?"; 157 } 158 } 159 160 161 struct radius_attr_type { 162 u8 type; 163 char *name; 164 enum { 165 RADIUS_ATTR_UNDIST, RADIUS_ATTR_TEXT, RADIUS_ATTR_IP, 166 RADIUS_ATTR_HEXDUMP, RADIUS_ATTR_INT32, RADIUS_ATTR_IPV6 167 } data_type; 168 }; 169 170 static struct radius_attr_type radius_attrs[] = 171 { 172 { RADIUS_ATTR_USER_NAME, "User-Name", RADIUS_ATTR_TEXT }, 173 { RADIUS_ATTR_USER_PASSWORD, "User-Password", RADIUS_ATTR_UNDIST }, 174 { RADIUS_ATTR_NAS_IP_ADDRESS, "NAS-IP-Address", RADIUS_ATTR_IP }, 175 { RADIUS_ATTR_NAS_PORT, "NAS-Port", RADIUS_ATTR_INT32 }, 176 { RADIUS_ATTR_FRAMED_MTU, "Framed-MTU", RADIUS_ATTR_INT32 }, 177 { RADIUS_ATTR_REPLY_MESSAGE, "Reply-Message", RADIUS_ATTR_TEXT }, 178 { RADIUS_ATTR_STATE, "State", RADIUS_ATTR_UNDIST }, 179 { RADIUS_ATTR_CLASS, "Class", RADIUS_ATTR_UNDIST }, 180 { RADIUS_ATTR_VENDOR_SPECIFIC, "Vendor-Specific", RADIUS_ATTR_UNDIST }, 181 { RADIUS_ATTR_SESSION_TIMEOUT, "Session-Timeout", RADIUS_ATTR_INT32 }, 182 { RADIUS_ATTR_IDLE_TIMEOUT, "Idle-Timeout", RADIUS_ATTR_INT32 }, 183 { RADIUS_ATTR_TERMINATION_ACTION, "Termination-Action", 184 RADIUS_ATTR_INT32 }, 185 { RADIUS_ATTR_CALLED_STATION_ID, "Called-Station-Id", 186 RADIUS_ATTR_TEXT }, 187 { RADIUS_ATTR_CALLING_STATION_ID, "Calling-Station-Id", 188 RADIUS_ATTR_TEXT }, 189 { RADIUS_ATTR_NAS_IDENTIFIER, "NAS-Identifier", RADIUS_ATTR_TEXT }, 190 { RADIUS_ATTR_PROXY_STATE, "Proxy-State", RADIUS_ATTR_UNDIST }, 191 { RADIUS_ATTR_ACCT_STATUS_TYPE, "Acct-Status-Type", 192 RADIUS_ATTR_INT32 }, 193 { RADIUS_ATTR_ACCT_DELAY_TIME, "Acct-Delay-Time", RADIUS_ATTR_INT32 }, 194 { RADIUS_ATTR_ACCT_INPUT_OCTETS, "Acct-Input-Octets", 195 RADIUS_ATTR_INT32 }, 196 { RADIUS_ATTR_ACCT_OUTPUT_OCTETS, "Acct-Output-Octets", 197 RADIUS_ATTR_INT32 }, 198 { RADIUS_ATTR_ACCT_SESSION_ID, "Acct-Session-Id", RADIUS_ATTR_TEXT }, 199 { RADIUS_ATTR_ACCT_AUTHENTIC, "Acct-Authentic", RADIUS_ATTR_INT32 }, 200 { RADIUS_ATTR_ACCT_SESSION_TIME, "Acct-Session-Time", 201 RADIUS_ATTR_INT32 }, 202 { RADIUS_ATTR_ACCT_INPUT_PACKETS, "Acct-Input-Packets", 203 RADIUS_ATTR_INT32 }, 204 { RADIUS_ATTR_ACCT_OUTPUT_PACKETS, "Acct-Output-Packets", 205 RADIUS_ATTR_INT32 }, 206 { RADIUS_ATTR_ACCT_TERMINATE_CAUSE, "Acct-Terminate-Cause", 207 RADIUS_ATTR_INT32 }, 208 { RADIUS_ATTR_ACCT_MULTI_SESSION_ID, "Acct-Multi-Session-Id", 209 RADIUS_ATTR_TEXT }, 210 { RADIUS_ATTR_ACCT_LINK_COUNT, "Acct-Link-Count", RADIUS_ATTR_INT32 }, 211 { RADIUS_ATTR_ACCT_INPUT_GIGAWORDS, "Acct-Input-Gigawords", 212 RADIUS_ATTR_INT32 }, 213 { RADIUS_ATTR_ACCT_OUTPUT_GIGAWORDS, "Acct-Output-Gigawords", 214 RADIUS_ATTR_INT32 }, 215 { RADIUS_ATTR_EVENT_TIMESTAMP, "Event-Timestamp", 216 RADIUS_ATTR_INT32 }, 217 { RADIUS_ATTR_NAS_PORT_TYPE, "NAS-Port-Type", RADIUS_ATTR_INT32 }, 218 { RADIUS_ATTR_TUNNEL_TYPE, "Tunnel-Type", RADIUS_ATTR_HEXDUMP }, 219 { RADIUS_ATTR_TUNNEL_MEDIUM_TYPE, "Tunnel-Medium-Type", 220 RADIUS_ATTR_HEXDUMP }, 221 { RADIUS_ATTR_TUNNEL_PASSWORD, "Tunnel-Password", 222 RADIUS_ATTR_UNDIST }, 223 { RADIUS_ATTR_CONNECT_INFO, "Connect-Info", RADIUS_ATTR_TEXT }, 224 { RADIUS_ATTR_EAP_MESSAGE, "EAP-Message", RADIUS_ATTR_UNDIST }, 225 { RADIUS_ATTR_MESSAGE_AUTHENTICATOR, "Message-Authenticator", 226 RADIUS_ATTR_UNDIST }, 227 { RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID, "Tunnel-Private-Group-Id", 228 RADIUS_ATTR_HEXDUMP }, 229 { RADIUS_ATTR_ACCT_INTERIM_INTERVAL, "Acct-Interim-Interval", 230 RADIUS_ATTR_INT32 }, 231 { RADIUS_ATTR_CHARGEABLE_USER_IDENTITY, "Chargeable-User-Identity", 232 RADIUS_ATTR_TEXT }, 233 { RADIUS_ATTR_NAS_IPV6_ADDRESS, "NAS-IPv6-Address", RADIUS_ATTR_IPV6 }, 234 { RADIUS_ATTR_ERROR_CAUSE, "Error-Cause", RADIUS_ATTR_INT32 }, 235 { RADIUS_ATTR_EAP_KEY_NAME, "EAP-Key-Name", RADIUS_ATTR_HEXDUMP }, 236 { RADIUS_ATTR_MOBILITY_DOMAIN_ID, "Mobility-Domain-Id", 237 RADIUS_ATTR_INT32 }, 238 { RADIUS_ATTR_WLAN_HESSID, "WLAN-HESSID", RADIUS_ATTR_TEXT }, 239 { RADIUS_ATTR_WLAN_PAIRWISE_CIPHER, "WLAN-Pairwise-Cipher", 240 RADIUS_ATTR_HEXDUMP }, 241 { RADIUS_ATTR_WLAN_GROUP_CIPHER, "WLAN-Group-Cipher", 242 RADIUS_ATTR_HEXDUMP }, 243 { RADIUS_ATTR_WLAN_AKM_SUITE, "WLAN-AKM-Suite", 244 RADIUS_ATTR_HEXDUMP }, 245 { RADIUS_ATTR_WLAN_GROUP_MGMT_CIPHER, "WLAN-Group-Mgmt-Pairwise-Cipher", 246 RADIUS_ATTR_HEXDUMP }, 247 }; 248 #define RADIUS_ATTRS ARRAY_SIZE(radius_attrs) 249 250 251 static struct radius_attr_type *radius_get_attr_type(u8 type) 252 { 253 size_t i; 254 255 for (i = 0; i < RADIUS_ATTRS; i++) { 256 if (type == radius_attrs[i].type) 257 return &radius_attrs[i]; 258 } 259 260 return NULL; 261 } 262 263 264 static void radius_msg_dump_attr(struct radius_attr_hdr *hdr) 265 { 266 struct radius_attr_type *attr; 267 int len; 268 unsigned char *pos; 269 char buf[1000]; 270 271 attr = radius_get_attr_type(hdr->type); 272 273 wpa_printf(MSG_INFO, " Attribute %d (%s) length=%d", 274 hdr->type, attr ? attr->name : "?Unknown?", hdr->length); 275 276 if (attr == NULL || hdr->length < sizeof(struct radius_attr_hdr)) 277 return; 278 279 len = hdr->length - sizeof(struct radius_attr_hdr); 280 pos = (unsigned char *) (hdr + 1); 281 282 switch (attr->data_type) { 283 case RADIUS_ATTR_TEXT: 284 printf_encode(buf, sizeof(buf), pos, len); 285 wpa_printf(MSG_INFO, " Value: '%s'", buf); 286 break; 287 288 case RADIUS_ATTR_IP: 289 if (len == 4) { 290 struct in_addr addr; 291 os_memcpy(&addr, pos, 4); 292 wpa_printf(MSG_INFO, " Value: %s", 293 inet_ntoa(addr)); 294 } else { 295 wpa_printf(MSG_INFO, " Invalid IP address length %d", 296 len); 297 } 298 break; 299 300 #ifdef CONFIG_IPV6 301 case RADIUS_ATTR_IPV6: 302 if (len == 16) { 303 const char *atxt; 304 struct in6_addr *addr = (struct in6_addr *) pos; 305 atxt = inet_ntop(AF_INET6, addr, buf, sizeof(buf)); 306 wpa_printf(MSG_INFO, " Value: %s", 307 atxt ? atxt : "?"); 308 } else { 309 wpa_printf(MSG_INFO, " Invalid IPv6 address length %d", 310 len); 311 } 312 break; 313 #endif /* CONFIG_IPV6 */ 314 315 case RADIUS_ATTR_HEXDUMP: 316 case RADIUS_ATTR_UNDIST: 317 wpa_snprintf_hex(buf, sizeof(buf), pos, len); 318 wpa_printf(MSG_INFO, " Value: %s", buf); 319 break; 320 321 case RADIUS_ATTR_INT32: 322 if (len == 4) 323 wpa_printf(MSG_INFO, " Value: %u", 324 WPA_GET_BE32(pos)); 325 else 326 wpa_printf(MSG_INFO, " Invalid INT32 length %d", 327 len); 328 break; 329 330 default: 331 break; 332 } 333 } 334 335 336 void radius_msg_dump(struct radius_msg *msg) 337 { 338 size_t i; 339 340 wpa_printf(MSG_INFO, "RADIUS message: code=%d (%s) identifier=%d length=%d", 341 msg->hdr->code, radius_code_string(msg->hdr->code), 342 msg->hdr->identifier, be_to_host16(msg->hdr->length)); 343 344 for (i = 0; i < msg->attr_used; i++) { 345 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i); 346 radius_msg_dump_attr(attr); 347 } 348 } 349 350 351 int radius_msg_finish(struct radius_msg *msg, const u8 *secret, 352 size_t secret_len) 353 { 354 if (secret) { 355 u8 auth[MD5_MAC_LEN]; 356 struct radius_attr_hdr *attr; 357 358 os_memset(auth, 0, MD5_MAC_LEN); 359 attr = radius_msg_add_attr(msg, 360 RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 361 auth, MD5_MAC_LEN); 362 if (attr == NULL) { 363 wpa_printf(MSG_WARNING, "RADIUS: Could not add " 364 "Message-Authenticator"); 365 return -1; 366 } 367 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 368 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 369 wpabuf_len(msg->buf), (u8 *) (attr + 1)); 370 } else 371 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 372 373 if (wpabuf_len(msg->buf) > 0xffff) { 374 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)", 375 (unsigned long) wpabuf_len(msg->buf)); 376 return -1; 377 } 378 return 0; 379 } 380 381 382 int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret, 383 size_t secret_len, const u8 *req_authenticator) 384 { 385 u8 auth[MD5_MAC_LEN]; 386 struct radius_attr_hdr *attr; 387 const u8 *addr[4]; 388 size_t len[4]; 389 390 os_memset(auth, 0, MD5_MAC_LEN); 391 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 392 auth, MD5_MAC_LEN); 393 if (attr == NULL) { 394 wpa_printf(MSG_ERROR, "WARNING: Could not add Message-Authenticator"); 395 return -1; 396 } 397 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 398 os_memcpy(msg->hdr->authenticator, req_authenticator, 399 sizeof(msg->hdr->authenticator)); 400 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 401 wpabuf_len(msg->buf), (u8 *) (attr + 1)); 402 403 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */ 404 addr[0] = (u8 *) msg->hdr; 405 len[0] = 1 + 1 + 2; 406 addr[1] = req_authenticator; 407 len[1] = MD5_MAC_LEN; 408 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr); 409 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 410 addr[3] = secret; 411 len[3] = secret_len; 412 md5_vector(4, addr, len, msg->hdr->authenticator); 413 414 if (wpabuf_len(msg->buf) > 0xffff) { 415 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)", 416 (unsigned long) wpabuf_len(msg->buf)); 417 return -1; 418 } 419 return 0; 420 } 421 422 423 int radius_msg_finish_das_resp(struct radius_msg *msg, const u8 *secret, 424 size_t secret_len, 425 const struct radius_hdr *req_hdr) 426 { 427 const u8 *addr[2]; 428 size_t len[2]; 429 u8 auth[MD5_MAC_LEN]; 430 struct radius_attr_hdr *attr; 431 432 os_memset(auth, 0, MD5_MAC_LEN); 433 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 434 auth, MD5_MAC_LEN); 435 if (attr == NULL) { 436 wpa_printf(MSG_WARNING, "Could not add Message-Authenticator"); 437 return -1; 438 } 439 440 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 441 os_memcpy(msg->hdr->authenticator, req_hdr->authenticator, 16); 442 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 443 wpabuf_len(msg->buf), (u8 *) (attr + 1)); 444 445 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */ 446 addr[0] = wpabuf_head_u8(msg->buf); 447 len[0] = wpabuf_len(msg->buf); 448 addr[1] = secret; 449 len[1] = secret_len; 450 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0) 451 return -1; 452 453 if (wpabuf_len(msg->buf) > 0xffff) { 454 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)", 455 (unsigned long) wpabuf_len(msg->buf)); 456 return -1; 457 } 458 return 0; 459 } 460 461 462 void radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret, 463 size_t secret_len) 464 { 465 const u8 *addr[2]; 466 size_t len[2]; 467 468 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 469 os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN); 470 addr[0] = wpabuf_head(msg->buf); 471 len[0] = wpabuf_len(msg->buf); 472 addr[1] = secret; 473 len[1] = secret_len; 474 md5_vector(2, addr, len, msg->hdr->authenticator); 475 476 if (wpabuf_len(msg->buf) > 0xffff) { 477 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)", 478 (unsigned long) wpabuf_len(msg->buf)); 479 } 480 } 481 482 483 void radius_msg_finish_acct_resp(struct radius_msg *msg, const u8 *secret, 484 size_t secret_len, const u8 *req_authenticator) 485 { 486 const u8 *addr[2]; 487 size_t len[2]; 488 489 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 490 os_memcpy(msg->hdr->authenticator, req_authenticator, MD5_MAC_LEN); 491 addr[0] = wpabuf_head(msg->buf); 492 len[0] = wpabuf_len(msg->buf); 493 addr[1] = secret; 494 len[1] = secret_len; 495 md5_vector(2, addr, len, msg->hdr->authenticator); 496 497 if (wpabuf_len(msg->buf) > 0xffff) { 498 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)", 499 (unsigned long) wpabuf_len(msg->buf)); 500 } 501 } 502 503 504 int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret, 505 size_t secret_len) 506 { 507 const u8 *addr[4]; 508 size_t len[4]; 509 u8 zero[MD5_MAC_LEN]; 510 u8 hash[MD5_MAC_LEN]; 511 512 os_memset(zero, 0, sizeof(zero)); 513 addr[0] = (u8 *) msg->hdr; 514 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN; 515 addr[1] = zero; 516 len[1] = MD5_MAC_LEN; 517 addr[2] = (u8 *) (msg->hdr + 1); 518 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 519 addr[3] = secret; 520 len[3] = secret_len; 521 md5_vector(4, addr, len, hash); 522 return os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0; 523 } 524 525 526 int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret, 527 size_t secret_len) 528 { 529 const u8 *addr[4]; 530 size_t len[4]; 531 u8 zero[MD5_MAC_LEN]; 532 u8 hash[MD5_MAC_LEN]; 533 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN]; 534 u8 orig_authenticator[16]; 535 536 struct radius_attr_hdr *attr = NULL, *tmp; 537 size_t i; 538 539 os_memset(zero, 0, sizeof(zero)); 540 addr[0] = (u8 *) msg->hdr; 541 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN; 542 addr[1] = zero; 543 len[1] = MD5_MAC_LEN; 544 addr[2] = (u8 *) (msg->hdr + 1); 545 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 546 addr[3] = secret; 547 len[3] = secret_len; 548 md5_vector(4, addr, len, hash); 549 if (os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0) 550 return 1; 551 552 for (i = 0; i < msg->attr_used; i++) { 553 tmp = radius_get_attr_hdr(msg, i); 554 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) { 555 if (attr != NULL) { 556 wpa_printf(MSG_WARNING, "Multiple " 557 "Message-Authenticator attributes " 558 "in RADIUS message"); 559 return 1; 560 } 561 attr = tmp; 562 } 563 } 564 565 if (attr == NULL) { 566 /* Message-Authenticator is MAY; not required */ 567 return 0; 568 } 569 570 os_memcpy(orig, attr + 1, MD5_MAC_LEN); 571 os_memset(attr + 1, 0, MD5_MAC_LEN); 572 os_memcpy(orig_authenticator, msg->hdr->authenticator, 573 sizeof(orig_authenticator)); 574 os_memset(msg->hdr->authenticator, 0, 575 sizeof(msg->hdr->authenticator)); 576 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 577 wpabuf_len(msg->buf), auth); 578 os_memcpy(attr + 1, orig, MD5_MAC_LEN); 579 os_memcpy(msg->hdr->authenticator, orig_authenticator, 580 sizeof(orig_authenticator)); 581 582 return os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0; 583 } 584 585 586 static int radius_msg_add_attr_to_array(struct radius_msg *msg, 587 struct radius_attr_hdr *attr) 588 { 589 if (msg->attr_used >= msg->attr_size) { 590 size_t *nattr_pos; 591 int nlen = msg->attr_size * 2; 592 593 nattr_pos = os_realloc_array(msg->attr_pos, nlen, 594 sizeof(*msg->attr_pos)); 595 if (nattr_pos == NULL) 596 return -1; 597 598 msg->attr_pos = nattr_pos; 599 msg->attr_size = nlen; 600 } 601 602 msg->attr_pos[msg->attr_used++] = 603 (unsigned char *) attr - wpabuf_head_u8(msg->buf); 604 605 return 0; 606 } 607 608 609 struct radius_attr_hdr *radius_msg_add_attr(struct radius_msg *msg, u8 type, 610 const u8 *data, size_t data_len) 611 { 612 size_t buf_needed; 613 struct radius_attr_hdr *attr; 614 615 if (data_len > RADIUS_MAX_ATTR_LEN) { 616 wpa_printf(MSG_ERROR, "radius_msg_add_attr: too long attribute (%lu bytes)", 617 (unsigned long) data_len); 618 return NULL; 619 } 620 621 buf_needed = sizeof(*attr) + data_len; 622 623 if (wpabuf_tailroom(msg->buf) < buf_needed) { 624 /* allocate more space for message buffer */ 625 if (wpabuf_resize(&msg->buf, buf_needed) < 0) 626 return NULL; 627 msg->hdr = wpabuf_mhead(msg->buf); 628 } 629 630 attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr)); 631 attr->type = type; 632 attr->length = sizeof(*attr) + data_len; 633 wpabuf_put_data(msg->buf, data, data_len); 634 635 if (radius_msg_add_attr_to_array(msg, attr)) 636 return NULL; 637 638 return attr; 639 } 640 641 642 /** 643 * radius_msg_parse - Parse a RADIUS message 644 * @data: RADIUS message to be parsed 645 * @len: Length of data buffer in octets 646 * Returns: Parsed RADIUS message or %NULL on failure 647 * 648 * This parses a RADIUS message and makes a copy of its data. The caller is 649 * responsible for freeing the returned data with radius_msg_free(). 650 */ 651 struct radius_msg * radius_msg_parse(const u8 *data, size_t len) 652 { 653 struct radius_msg *msg; 654 struct radius_hdr *hdr; 655 struct radius_attr_hdr *attr; 656 size_t msg_len; 657 unsigned char *pos, *end; 658 659 if (data == NULL || len < sizeof(*hdr)) 660 return NULL; 661 662 hdr = (struct radius_hdr *) data; 663 664 msg_len = be_to_host16(hdr->length); 665 if (msg_len < sizeof(*hdr) || msg_len > len) { 666 wpa_printf(MSG_INFO, "RADIUS: Invalid message length"); 667 return NULL; 668 } 669 670 if (msg_len < len) { 671 wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after " 672 "RADIUS message", (unsigned long) len - msg_len); 673 } 674 675 msg = os_zalloc(sizeof(*msg)); 676 if (msg == NULL) 677 return NULL; 678 679 msg->buf = wpabuf_alloc_copy(data, msg_len); 680 if (msg->buf == NULL || radius_msg_initialize(msg)) { 681 radius_msg_free(msg); 682 return NULL; 683 } 684 msg->hdr = wpabuf_mhead(msg->buf); 685 686 /* parse attributes */ 687 pos = wpabuf_mhead_u8(msg->buf) + sizeof(struct radius_hdr); 688 end = wpabuf_mhead_u8(msg->buf) + wpabuf_len(msg->buf); 689 while (pos < end) { 690 if ((size_t) (end - pos) < sizeof(*attr)) 691 goto fail; 692 693 attr = (struct radius_attr_hdr *) pos; 694 695 if (pos + attr->length > end || attr->length < sizeof(*attr)) 696 goto fail; 697 698 /* TODO: check that attr->length is suitable for attr->type */ 699 700 if (radius_msg_add_attr_to_array(msg, attr)) 701 goto fail; 702 703 pos += attr->length; 704 } 705 706 return msg; 707 708 fail: 709 radius_msg_free(msg); 710 return NULL; 711 } 712 713 714 int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len) 715 { 716 const u8 *pos = data; 717 size_t left = data_len; 718 719 while (left > 0) { 720 int len; 721 if (left > RADIUS_MAX_ATTR_LEN) 722 len = RADIUS_MAX_ATTR_LEN; 723 else 724 len = left; 725 726 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE, 727 pos, len)) 728 return 0; 729 730 pos += len; 731 left -= len; 732 } 733 734 return 1; 735 } 736 737 738 struct wpabuf * radius_msg_get_eap(struct radius_msg *msg) 739 { 740 struct wpabuf *eap; 741 size_t len, i; 742 struct radius_attr_hdr *attr; 743 744 if (msg == NULL) 745 return NULL; 746 747 len = 0; 748 for (i = 0; i < msg->attr_used; i++) { 749 attr = radius_get_attr_hdr(msg, i); 750 if (attr->type == RADIUS_ATTR_EAP_MESSAGE && 751 attr->length > sizeof(struct radius_attr_hdr)) 752 len += attr->length - sizeof(struct radius_attr_hdr); 753 } 754 755 if (len == 0) 756 return NULL; 757 758 eap = wpabuf_alloc(len); 759 if (eap == NULL) 760 return NULL; 761 762 for (i = 0; i < msg->attr_used; i++) { 763 attr = radius_get_attr_hdr(msg, i); 764 if (attr->type == RADIUS_ATTR_EAP_MESSAGE && 765 attr->length > sizeof(struct radius_attr_hdr)) { 766 int flen = attr->length - sizeof(*attr); 767 wpabuf_put_data(eap, attr + 1, flen); 768 } 769 } 770 771 return eap; 772 } 773 774 775 int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret, 776 size_t secret_len, const u8 *req_auth) 777 { 778 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN]; 779 u8 orig_authenticator[16]; 780 struct radius_attr_hdr *attr = NULL, *tmp; 781 size_t i; 782 783 for (i = 0; i < msg->attr_used; i++) { 784 tmp = radius_get_attr_hdr(msg, i); 785 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) { 786 if (attr != NULL) { 787 wpa_printf(MSG_INFO, "Multiple Message-Authenticator attributes in RADIUS message"); 788 return 1; 789 } 790 attr = tmp; 791 } 792 } 793 794 if (attr == NULL) { 795 wpa_printf(MSG_INFO, "No Message-Authenticator attribute found"); 796 return 1; 797 } 798 799 os_memcpy(orig, attr + 1, MD5_MAC_LEN); 800 os_memset(attr + 1, 0, MD5_MAC_LEN); 801 if (req_auth) { 802 os_memcpy(orig_authenticator, msg->hdr->authenticator, 803 sizeof(orig_authenticator)); 804 os_memcpy(msg->hdr->authenticator, req_auth, 805 sizeof(msg->hdr->authenticator)); 806 } 807 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 808 wpabuf_len(msg->buf), auth); 809 os_memcpy(attr + 1, orig, MD5_MAC_LEN); 810 if (req_auth) { 811 os_memcpy(msg->hdr->authenticator, orig_authenticator, 812 sizeof(orig_authenticator)); 813 } 814 815 if (os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0) { 816 wpa_printf(MSG_INFO, "Invalid Message-Authenticator!"); 817 return 1; 818 } 819 820 return 0; 821 } 822 823 824 int radius_msg_verify(struct radius_msg *msg, const u8 *secret, 825 size_t secret_len, struct radius_msg *sent_msg, int auth) 826 { 827 const u8 *addr[4]; 828 size_t len[4]; 829 u8 hash[MD5_MAC_LEN]; 830 831 if (sent_msg == NULL) { 832 wpa_printf(MSG_INFO, "No matching Access-Request message found"); 833 return 1; 834 } 835 836 if (auth && 837 radius_msg_verify_msg_auth(msg, secret, secret_len, 838 sent_msg->hdr->authenticator)) { 839 return 1; 840 } 841 842 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */ 843 addr[0] = (u8 *) msg->hdr; 844 len[0] = 1 + 1 + 2; 845 addr[1] = sent_msg->hdr->authenticator; 846 len[1] = MD5_MAC_LEN; 847 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr); 848 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 849 addr[3] = secret; 850 len[3] = secret_len; 851 md5_vector(4, addr, len, hash); 852 if (os_memcmp_const(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) { 853 wpa_printf(MSG_INFO, "Response Authenticator invalid!"); 854 return 1; 855 } 856 857 return 0; 858 } 859 860 861 int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src, 862 u8 type) 863 { 864 struct radius_attr_hdr *attr; 865 size_t i; 866 int count = 0; 867 868 for (i = 0; i < src->attr_used; i++) { 869 attr = radius_get_attr_hdr(src, i); 870 if (attr->type == type && attr->length >= sizeof(*attr)) { 871 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1), 872 attr->length - sizeof(*attr))) 873 return -1; 874 count++; 875 } 876 } 877 878 return count; 879 } 880 881 882 /* Create Request Authenticator. The value should be unique over the lifetime 883 * of the shared secret between authenticator and authentication server. 884 * Use one-way MD5 hash calculated from current timestamp and some data given 885 * by the caller. */ 886 void radius_msg_make_authenticator(struct radius_msg *msg, 887 const u8 *data, size_t len) 888 { 889 struct os_time tv; 890 long int l; 891 const u8 *addr[3]; 892 size_t elen[3]; 893 894 os_get_time(&tv); 895 l = os_random(); 896 addr[0] = (u8 *) &tv; 897 elen[0] = sizeof(tv); 898 addr[1] = data; 899 elen[1] = len; 900 addr[2] = (u8 *) &l; 901 elen[2] = sizeof(l); 902 md5_vector(3, addr, elen, msg->hdr->authenticator); 903 } 904 905 906 /* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message. 907 * Returns the Attribute payload and sets alen to indicate the length of the 908 * payload if a vendor attribute with subtype is found, otherwise returns NULL. 909 * The returned payload is allocated with os_malloc() and caller must free it 910 * by calling os_free(). 911 */ 912 static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor, 913 u8 subtype, size_t *alen) 914 { 915 u8 *data, *pos; 916 size_t i, len; 917 918 if (msg == NULL) 919 return NULL; 920 921 for (i = 0; i < msg->attr_used; i++) { 922 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i); 923 size_t left; 924 u32 vendor_id; 925 struct radius_attr_vendor *vhdr; 926 927 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC || 928 attr->length < sizeof(*attr)) 929 continue; 930 931 left = attr->length - sizeof(*attr); 932 if (left < 4) 933 continue; 934 935 pos = (u8 *) (attr + 1); 936 937 os_memcpy(&vendor_id, pos, 4); 938 pos += 4; 939 left -= 4; 940 941 if (ntohl(vendor_id) != vendor) 942 continue; 943 944 while (left >= sizeof(*vhdr)) { 945 vhdr = (struct radius_attr_vendor *) pos; 946 if (vhdr->vendor_length > left || 947 vhdr->vendor_length < sizeof(*vhdr)) { 948 left = 0; 949 break; 950 } 951 if (vhdr->vendor_type != subtype) { 952 pos += vhdr->vendor_length; 953 left -= vhdr->vendor_length; 954 continue; 955 } 956 957 len = vhdr->vendor_length - sizeof(*vhdr); 958 data = os_malloc(len); 959 if (data == NULL) 960 return NULL; 961 os_memcpy(data, pos + sizeof(*vhdr), len); 962 if (alen) 963 *alen = len; 964 return data; 965 } 966 } 967 968 return NULL; 969 } 970 971 972 static u8 * decrypt_ms_key(const u8 *key, size_t len, 973 const u8 *req_authenticator, 974 const u8 *secret, size_t secret_len, size_t *reslen) 975 { 976 u8 *plain, *ppos, *res; 977 const u8 *pos; 978 size_t left, plen; 979 u8 hash[MD5_MAC_LEN]; 980 int i, first = 1; 981 const u8 *addr[3]; 982 size_t elen[3]; 983 984 /* key: 16-bit salt followed by encrypted key info */ 985 986 if (len < 2 + 16) 987 return NULL; 988 989 pos = key + 2; 990 left = len - 2; 991 if (left % 16) { 992 wpa_printf(MSG_INFO, "Invalid ms key len %lu", 993 (unsigned long) left); 994 return NULL; 995 } 996 997 plen = left; 998 ppos = plain = os_malloc(plen); 999 if (plain == NULL) 1000 return NULL; 1001 plain[0] = 0; 1002 1003 while (left > 0) { 1004 /* b(1) = MD5(Secret + Request-Authenticator + Salt) 1005 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */ 1006 1007 addr[0] = secret; 1008 elen[0] = secret_len; 1009 if (first) { 1010 addr[1] = req_authenticator; 1011 elen[1] = MD5_MAC_LEN; 1012 addr[2] = key; 1013 elen[2] = 2; /* Salt */ 1014 } else { 1015 addr[1] = pos - MD5_MAC_LEN; 1016 elen[1] = MD5_MAC_LEN; 1017 } 1018 md5_vector(first ? 3 : 2, addr, elen, hash); 1019 first = 0; 1020 1021 for (i = 0; i < MD5_MAC_LEN; i++) 1022 *ppos++ = *pos++ ^ hash[i]; 1023 left -= MD5_MAC_LEN; 1024 } 1025 1026 if (plain[0] == 0 || plain[0] > plen - 1) { 1027 wpa_printf(MSG_INFO, "Failed to decrypt MPPE key"); 1028 os_free(plain); 1029 return NULL; 1030 } 1031 1032 res = os_malloc(plain[0]); 1033 if (res == NULL) { 1034 os_free(plain); 1035 return NULL; 1036 } 1037 os_memcpy(res, plain + 1, plain[0]); 1038 if (reslen) 1039 *reslen = plain[0]; 1040 os_free(plain); 1041 return res; 1042 } 1043 1044 1045 static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt, 1046 const u8 *req_authenticator, 1047 const u8 *secret, size_t secret_len, 1048 u8 *ebuf, size_t *elen) 1049 { 1050 int i, len, first = 1; 1051 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos; 1052 const u8 *addr[3]; 1053 size_t _len[3]; 1054 1055 WPA_PUT_BE16(saltbuf, salt); 1056 1057 len = 1 + key_len; 1058 if (len & 0x0f) { 1059 len = (len & 0xf0) + 16; 1060 } 1061 os_memset(ebuf, 0, len); 1062 ebuf[0] = key_len; 1063 os_memcpy(ebuf + 1, key, key_len); 1064 1065 *elen = len; 1066 1067 pos = ebuf; 1068 while (len > 0) { 1069 /* b(1) = MD5(Secret + Request-Authenticator + Salt) 1070 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */ 1071 addr[0] = secret; 1072 _len[0] = secret_len; 1073 if (first) { 1074 addr[1] = req_authenticator; 1075 _len[1] = MD5_MAC_LEN; 1076 addr[2] = saltbuf; 1077 _len[2] = sizeof(saltbuf); 1078 } else { 1079 addr[1] = pos - MD5_MAC_LEN; 1080 _len[1] = MD5_MAC_LEN; 1081 } 1082 md5_vector(first ? 3 : 2, addr, _len, hash); 1083 first = 0; 1084 1085 for (i = 0; i < MD5_MAC_LEN; i++) 1086 *pos++ ^= hash[i]; 1087 1088 len -= MD5_MAC_LEN; 1089 } 1090 } 1091 1092 1093 struct radius_ms_mppe_keys * 1094 radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg, 1095 const u8 *secret, size_t secret_len) 1096 { 1097 u8 *key; 1098 size_t keylen; 1099 struct radius_ms_mppe_keys *keys; 1100 1101 if (msg == NULL || sent_msg == NULL) 1102 return NULL; 1103 1104 keys = os_zalloc(sizeof(*keys)); 1105 if (keys == NULL) 1106 return NULL; 1107 1108 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT, 1109 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY, 1110 &keylen); 1111 if (key) { 1112 keys->send = decrypt_ms_key(key, keylen, 1113 sent_msg->hdr->authenticator, 1114 secret, secret_len, 1115 &keys->send_len); 1116 os_free(key); 1117 } 1118 1119 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT, 1120 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY, 1121 &keylen); 1122 if (key) { 1123 keys->recv = decrypt_ms_key(key, keylen, 1124 sent_msg->hdr->authenticator, 1125 secret, secret_len, 1126 &keys->recv_len); 1127 os_free(key); 1128 } 1129 1130 return keys; 1131 } 1132 1133 1134 struct radius_ms_mppe_keys * 1135 radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg, 1136 const u8 *secret, size_t secret_len) 1137 { 1138 u8 *key; 1139 size_t keylen; 1140 struct radius_ms_mppe_keys *keys; 1141 1142 if (msg == NULL || sent_msg == NULL) 1143 return NULL; 1144 1145 keys = os_zalloc(sizeof(*keys)); 1146 if (keys == NULL) 1147 return NULL; 1148 1149 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO, 1150 RADIUS_CISCO_AV_PAIR, &keylen); 1151 if (key && keylen == 51 && 1152 os_memcmp(key, "leap:session-key=", 17) == 0) { 1153 keys->recv = decrypt_ms_key(key + 17, keylen - 17, 1154 sent_msg->hdr->authenticator, 1155 secret, secret_len, 1156 &keys->recv_len); 1157 } 1158 os_free(key); 1159 1160 return keys; 1161 } 1162 1163 1164 int radius_msg_add_mppe_keys(struct radius_msg *msg, 1165 const u8 *req_authenticator, 1166 const u8 *secret, size_t secret_len, 1167 const u8 *send_key, size_t send_key_len, 1168 const u8 *recv_key, size_t recv_key_len) 1169 { 1170 struct radius_attr_hdr *attr; 1171 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT); 1172 u8 *buf; 1173 struct radius_attr_vendor *vhdr; 1174 u8 *pos; 1175 size_t elen; 1176 int hlen; 1177 u16 salt; 1178 1179 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2; 1180 1181 /* MS-MPPE-Send-Key */ 1182 buf = os_malloc(hlen + send_key_len + 16); 1183 if (buf == NULL) { 1184 return 0; 1185 } 1186 pos = buf; 1187 os_memcpy(pos, &vendor_id, sizeof(vendor_id)); 1188 pos += sizeof(vendor_id); 1189 vhdr = (struct radius_attr_vendor *) pos; 1190 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY; 1191 pos = (u8 *) (vhdr + 1); 1192 salt = os_random() | 0x8000; 1193 WPA_PUT_BE16(pos, salt); 1194 pos += 2; 1195 encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret, 1196 secret_len, pos, &elen); 1197 vhdr->vendor_length = hlen + elen - sizeof(vendor_id); 1198 1199 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC, 1200 buf, hlen + elen); 1201 os_free(buf); 1202 if (attr == NULL) { 1203 return 0; 1204 } 1205 1206 /* MS-MPPE-Recv-Key */ 1207 buf = os_malloc(hlen + send_key_len + 16); 1208 if (buf == NULL) { 1209 return 0; 1210 } 1211 pos = buf; 1212 os_memcpy(pos, &vendor_id, sizeof(vendor_id)); 1213 pos += sizeof(vendor_id); 1214 vhdr = (struct radius_attr_vendor *) pos; 1215 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY; 1216 pos = (u8 *) (vhdr + 1); 1217 salt ^= 1; 1218 WPA_PUT_BE16(pos, salt); 1219 pos += 2; 1220 encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret, 1221 secret_len, pos, &elen); 1222 vhdr->vendor_length = hlen + elen - sizeof(vendor_id); 1223 1224 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC, 1225 buf, hlen + elen); 1226 os_free(buf); 1227 if (attr == NULL) { 1228 return 0; 1229 } 1230 1231 return 1; 1232 } 1233 1234 1235 int radius_msg_add_wfa(struct radius_msg *msg, u8 subtype, const u8 *data, 1236 size_t len) 1237 { 1238 struct radius_attr_hdr *attr; 1239 u8 *buf, *pos; 1240 size_t alen; 1241 1242 alen = 4 + 2 + len; 1243 buf = os_malloc(alen); 1244 if (buf == NULL) 1245 return 0; 1246 pos = buf; 1247 WPA_PUT_BE32(pos, RADIUS_VENDOR_ID_WFA); 1248 pos += 4; 1249 *pos++ = subtype; 1250 *pos++ = 2 + len; 1251 os_memcpy(pos, data, len); 1252 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC, 1253 buf, alen); 1254 os_free(buf); 1255 if (attr == NULL) 1256 return 0; 1257 1258 return 1; 1259 } 1260 1261 1262 int radius_user_password_hide(struct radius_msg *msg, 1263 const u8 *data, size_t data_len, 1264 const u8 *secret, size_t secret_len, 1265 u8 *buf, size_t buf_len) 1266 { 1267 size_t padlen, i, pos; 1268 const u8 *addr[2]; 1269 size_t len[2]; 1270 u8 hash[16]; 1271 1272 if (data_len + 16 > buf_len) 1273 return -1; 1274 1275 os_memcpy(buf, data, data_len); 1276 1277 padlen = data_len % 16; 1278 if (padlen && data_len < buf_len) { 1279 padlen = 16 - padlen; 1280 os_memset(buf + data_len, 0, padlen); 1281 buf_len = data_len + padlen; 1282 } else { 1283 buf_len = data_len; 1284 } 1285 1286 addr[0] = secret; 1287 len[0] = secret_len; 1288 addr[1] = msg->hdr->authenticator; 1289 len[1] = 16; 1290 md5_vector(2, addr, len, hash); 1291 1292 for (i = 0; i < 16; i++) 1293 buf[i] ^= hash[i]; 1294 pos = 16; 1295 1296 while (pos < buf_len) { 1297 addr[0] = secret; 1298 len[0] = secret_len; 1299 addr[1] = &buf[pos - 16]; 1300 len[1] = 16; 1301 md5_vector(2, addr, len, hash); 1302 1303 for (i = 0; i < 16; i++) 1304 buf[pos + i] ^= hash[i]; 1305 1306 pos += 16; 1307 } 1308 1309 return buf_len; 1310 } 1311 1312 1313 /* Add User-Password attribute to a RADIUS message and encrypt it as specified 1314 * in RFC 2865, Chap. 5.2 */ 1315 struct radius_attr_hdr * 1316 radius_msg_add_attr_user_password(struct radius_msg *msg, 1317 const u8 *data, size_t data_len, 1318 const u8 *secret, size_t secret_len) 1319 { 1320 u8 buf[128]; 1321 int res; 1322 1323 res = radius_user_password_hide(msg, data, data_len, 1324 secret, secret_len, buf, sizeof(buf)); 1325 if (res < 0) 1326 return NULL; 1327 1328 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD, 1329 buf, res); 1330 } 1331 1332 1333 int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len) 1334 { 1335 struct radius_attr_hdr *attr = NULL, *tmp; 1336 size_t i, dlen; 1337 1338 for (i = 0; i < msg->attr_used; i++) { 1339 tmp = radius_get_attr_hdr(msg, i); 1340 if (tmp->type == type) { 1341 attr = tmp; 1342 break; 1343 } 1344 } 1345 1346 if (!attr || attr->length < sizeof(*attr)) 1347 return -1; 1348 1349 dlen = attr->length - sizeof(*attr); 1350 if (buf) 1351 os_memcpy(buf, (attr + 1), dlen > len ? len : dlen); 1352 return dlen; 1353 } 1354 1355 1356 int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf, 1357 size_t *len, const u8 *start) 1358 { 1359 size_t i; 1360 struct radius_attr_hdr *attr = NULL, *tmp; 1361 1362 for (i = 0; i < msg->attr_used; i++) { 1363 tmp = radius_get_attr_hdr(msg, i); 1364 if (tmp->type == type && 1365 (start == NULL || (u8 *) tmp > start)) { 1366 attr = tmp; 1367 break; 1368 } 1369 } 1370 1371 if (!attr || attr->length < sizeof(*attr)) 1372 return -1; 1373 1374 *buf = (u8 *) (attr + 1); 1375 *len = attr->length - sizeof(*attr); 1376 return 0; 1377 } 1378 1379 1380 int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len) 1381 { 1382 size_t i; 1383 int count; 1384 1385 for (count = 0, i = 0; i < msg->attr_used; i++) { 1386 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i); 1387 if (attr->type == type && 1388 attr->length >= sizeof(struct radius_attr_hdr) + min_len) 1389 count++; 1390 } 1391 1392 return count; 1393 } 1394 1395 1396 struct radius_tunnel_attrs { 1397 int tag_used; 1398 int type; /* Tunnel-Type */ 1399 int medium_type; /* Tunnel-Medium-Type */ 1400 int vlanid; 1401 }; 1402 1403 1404 /** 1405 * radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information 1406 * @msg: RADIUS message 1407 * Returns: VLAN ID for the first tunnel configuration of -1 if none is found 1408 */ 1409 int radius_msg_get_vlanid(struct radius_msg *msg) 1410 { 1411 struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun; 1412 size_t i; 1413 struct radius_attr_hdr *attr = NULL; 1414 const u8 *data; 1415 char buf[10]; 1416 size_t dlen; 1417 1418 os_memset(&tunnel, 0, sizeof(tunnel)); 1419 1420 for (i = 0; i < msg->attr_used; i++) { 1421 attr = radius_get_attr_hdr(msg, i); 1422 if (attr->length < sizeof(*attr)) 1423 return -1; 1424 data = (const u8 *) (attr + 1); 1425 dlen = attr->length - sizeof(*attr); 1426 if (attr->length < 3) 1427 continue; 1428 if (data[0] >= RADIUS_TUNNEL_TAGS) 1429 tun = &tunnel[0]; 1430 else 1431 tun = &tunnel[data[0]]; 1432 1433 switch (attr->type) { 1434 case RADIUS_ATTR_TUNNEL_TYPE: 1435 if (attr->length != 6) 1436 break; 1437 tun->tag_used++; 1438 tun->type = WPA_GET_BE24(data + 1); 1439 break; 1440 case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE: 1441 if (attr->length != 6) 1442 break; 1443 tun->tag_used++; 1444 tun->medium_type = WPA_GET_BE24(data + 1); 1445 break; 1446 case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID: 1447 if (data[0] < RADIUS_TUNNEL_TAGS) { 1448 data++; 1449 dlen--; 1450 } 1451 if (dlen >= sizeof(buf)) 1452 break; 1453 os_memcpy(buf, data, dlen); 1454 buf[dlen] = '\0'; 1455 tun->tag_used++; 1456 tun->vlanid = atoi(buf); 1457 break; 1458 } 1459 } 1460 1461 for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) { 1462 tun = &tunnel[i]; 1463 if (tun->tag_used && 1464 tun->type == RADIUS_TUNNEL_TYPE_VLAN && 1465 tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 && 1466 tun->vlanid > 0) 1467 return tun->vlanid; 1468 } 1469 1470 return -1; 1471 } 1472 1473 1474 /** 1475 * radius_msg_get_tunnel_password - Parse RADIUS attribute Tunnel-Password 1476 * @msg: Received RADIUS message 1477 * @keylen: Length of returned password 1478 * @secret: RADIUS shared secret 1479 * @secret_len: Length of secret 1480 * @sent_msg: Sent RADIUS message 1481 * @n: Number of password attribute to return (starting with 0) 1482 * Returns: Pointer to n-th password (free with os_free) or %NULL 1483 */ 1484 char * radius_msg_get_tunnel_password(struct radius_msg *msg, int *keylen, 1485 const u8 *secret, size_t secret_len, 1486 struct radius_msg *sent_msg, size_t n) 1487 { 1488 u8 *buf = NULL; 1489 size_t buflen; 1490 const u8 *salt; 1491 u8 *str; 1492 const u8 *addr[3]; 1493 size_t len[3]; 1494 u8 hash[16]; 1495 u8 *pos; 1496 size_t i, j = 0; 1497 struct radius_attr_hdr *attr; 1498 const u8 *data; 1499 size_t dlen; 1500 const u8 *fdata = NULL; /* points to found item */ 1501 size_t fdlen = -1; 1502 char *ret = NULL; 1503 1504 /* find n-th valid Tunnel-Password attribute */ 1505 for (i = 0; i < msg->attr_used; i++) { 1506 attr = radius_get_attr_hdr(msg, i); 1507 if (attr == NULL || 1508 attr->type != RADIUS_ATTR_TUNNEL_PASSWORD) { 1509 continue; 1510 } 1511 if (attr->length <= 5) 1512 continue; 1513 data = (const u8 *) (attr + 1); 1514 dlen = attr->length - sizeof(*attr); 1515 if (dlen <= 3 || dlen % 16 != 3) 1516 continue; 1517 j++; 1518 if (j <= n) 1519 continue; 1520 1521 fdata = data; 1522 fdlen = dlen; 1523 break; 1524 } 1525 if (fdata == NULL) 1526 goto out; 1527 1528 /* alloc writable memory for decryption */ 1529 buf = os_malloc(fdlen); 1530 if (buf == NULL) 1531 goto out; 1532 os_memcpy(buf, fdata, fdlen); 1533 buflen = fdlen; 1534 1535 /* init pointers */ 1536 salt = buf + 1; 1537 str = buf + 3; 1538 1539 /* decrypt blocks */ 1540 pos = buf + buflen - 16; /* last block */ 1541 while (pos >= str + 16) { /* all but the first block */ 1542 addr[0] = secret; 1543 len[0] = secret_len; 1544 addr[1] = pos - 16; 1545 len[1] = 16; 1546 md5_vector(2, addr, len, hash); 1547 1548 for (i = 0; i < 16; i++) 1549 pos[i] ^= hash[i]; 1550 1551 pos -= 16; 1552 } 1553 1554 /* decrypt first block */ 1555 if (str != pos) 1556 goto out; 1557 addr[0] = secret; 1558 len[0] = secret_len; 1559 addr[1] = sent_msg->hdr->authenticator; 1560 len[1] = 16; 1561 addr[2] = salt; 1562 len[2] = 2; 1563 md5_vector(3, addr, len, hash); 1564 1565 for (i = 0; i < 16; i++) 1566 pos[i] ^= hash[i]; 1567 1568 /* derive plaintext length from first subfield */ 1569 *keylen = (unsigned char) str[0]; 1570 if ((u8 *) (str + *keylen) >= (u8 *) (buf + buflen)) { 1571 /* decryption error - invalid key length */ 1572 goto out; 1573 } 1574 if (*keylen == 0) { 1575 /* empty password */ 1576 goto out; 1577 } 1578 1579 /* copy passphrase into new buffer */ 1580 ret = os_malloc(*keylen); 1581 if (ret) 1582 os_memcpy(ret, str + 1, *keylen); 1583 1584 out: 1585 /* return new buffer */ 1586 os_free(buf); 1587 return ret; 1588 } 1589 1590 1591 void radius_free_class(struct radius_class_data *c) 1592 { 1593 size_t i; 1594 if (c == NULL) 1595 return; 1596 for (i = 0; i < c->count; i++) 1597 os_free(c->attr[i].data); 1598 os_free(c->attr); 1599 c->attr = NULL; 1600 c->count = 0; 1601 } 1602 1603 1604 int radius_copy_class(struct radius_class_data *dst, 1605 const struct radius_class_data *src) 1606 { 1607 size_t i; 1608 1609 if (src->attr == NULL) 1610 return 0; 1611 1612 dst->attr = os_calloc(src->count, sizeof(struct radius_attr_data)); 1613 if (dst->attr == NULL) 1614 return -1; 1615 1616 dst->count = 0; 1617 1618 for (i = 0; i < src->count; i++) { 1619 dst->attr[i].data = os_malloc(src->attr[i].len); 1620 if (dst->attr[i].data == NULL) 1621 break; 1622 dst->count++; 1623 os_memcpy(dst->attr[i].data, src->attr[i].data, 1624 src->attr[i].len); 1625 dst->attr[i].len = src->attr[i].len; 1626 } 1627 1628 return 0; 1629 } 1630 1631 1632 u8 radius_msg_find_unlisted_attr(struct radius_msg *msg, u8 *attrs) 1633 { 1634 size_t i, j; 1635 struct radius_attr_hdr *attr; 1636 1637 for (i = 0; i < msg->attr_used; i++) { 1638 attr = radius_get_attr_hdr(msg, i); 1639 1640 for (j = 0; attrs[j]; j++) { 1641 if (attr->type == attrs[j]) 1642 break; 1643 } 1644 1645 if (attrs[j] == 0) 1646 return attr->type; /* unlisted attr */ 1647 } 1648 1649 return 0; 1650 } 1651
