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 const 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_OPERATOR_NAME, "Operator-Name", RADIUS_ATTR_TEXT }, 237 { RADIUS_ATTR_LOCATION_INFO, "Location-Information", 238 RADIUS_ATTR_HEXDUMP }, 239 { RADIUS_ATTR_LOCATION_DATA, "Location-Data", RADIUS_ATTR_HEXDUMP }, 240 { RADIUS_ATTR_BASIC_LOCATION_POLICY_RULES, 241 "Basic-Location-Policy-Rules", RADIUS_ATTR_HEXDUMP }, 242 { RADIUS_ATTR_EXTENDED_LOCATION_POLICY_RULES, 243 "Extended-Location-Policy-Rules", RADIUS_ATTR_HEXDUMP }, 244 { RADIUS_ATTR_LOCATION_CAPABLE, "Location-Capable", RADIUS_ATTR_INT32 }, 245 { RADIUS_ATTR_REQUESTED_LOCATION_INFO, "Requested-Location-Info", 246 RADIUS_ATTR_INT32 }, 247 { RADIUS_ATTR_MOBILITY_DOMAIN_ID, "Mobility-Domain-Id", 248 RADIUS_ATTR_INT32 }, 249 { RADIUS_ATTR_WLAN_HESSID, "WLAN-HESSID", RADIUS_ATTR_TEXT }, 250 { RADIUS_ATTR_WLAN_PAIRWISE_CIPHER, "WLAN-Pairwise-Cipher", 251 RADIUS_ATTR_HEXDUMP }, 252 { RADIUS_ATTR_WLAN_GROUP_CIPHER, "WLAN-Group-Cipher", 253 RADIUS_ATTR_HEXDUMP }, 254 { RADIUS_ATTR_WLAN_AKM_SUITE, "WLAN-AKM-Suite", 255 RADIUS_ATTR_HEXDUMP }, 256 { RADIUS_ATTR_WLAN_GROUP_MGMT_CIPHER, "WLAN-Group-Mgmt-Pairwise-Cipher", 257 RADIUS_ATTR_HEXDUMP }, 258 }; 259 #define RADIUS_ATTRS ARRAY_SIZE(radius_attrs) 260 261 262 static const struct radius_attr_type *radius_get_attr_type(u8 type) 263 { 264 size_t i; 265 266 for (i = 0; i < RADIUS_ATTRS; i++) { 267 if (type == radius_attrs[i].type) 268 return &radius_attrs[i]; 269 } 270 271 return NULL; 272 } 273 274 275 static void radius_msg_dump_attr(struct radius_attr_hdr *hdr) 276 { 277 const struct radius_attr_type *attr; 278 int len; 279 unsigned char *pos; 280 char buf[1000]; 281 282 attr = radius_get_attr_type(hdr->type); 283 284 wpa_printf(MSG_INFO, " Attribute %d (%s) length=%d", 285 hdr->type, attr ? attr->name : "?Unknown?", hdr->length); 286 287 if (attr == NULL || hdr->length < sizeof(struct radius_attr_hdr)) 288 return; 289 290 len = hdr->length - sizeof(struct radius_attr_hdr); 291 pos = (unsigned char *) (hdr + 1); 292 293 switch (attr->data_type) { 294 case RADIUS_ATTR_TEXT: 295 printf_encode(buf, sizeof(buf), pos, len); 296 wpa_printf(MSG_INFO, " Value: '%s'", buf); 297 break; 298 299 case RADIUS_ATTR_IP: 300 if (len == 4) { 301 struct in_addr addr; 302 os_memcpy(&addr, pos, 4); 303 wpa_printf(MSG_INFO, " Value: %s", 304 inet_ntoa(addr)); 305 } else { 306 wpa_printf(MSG_INFO, " Invalid IP address length %d", 307 len); 308 } 309 break; 310 311 #ifdef CONFIG_IPV6 312 case RADIUS_ATTR_IPV6: 313 if (len == 16) { 314 const char *atxt; 315 struct in6_addr *addr = (struct in6_addr *) pos; 316 atxt = inet_ntop(AF_INET6, addr, buf, sizeof(buf)); 317 wpa_printf(MSG_INFO, " Value: %s", 318 atxt ? atxt : "?"); 319 } else { 320 wpa_printf(MSG_INFO, " Invalid IPv6 address length %d", 321 len); 322 } 323 break; 324 #endif /* CONFIG_IPV6 */ 325 326 case RADIUS_ATTR_HEXDUMP: 327 case RADIUS_ATTR_UNDIST: 328 wpa_snprintf_hex(buf, sizeof(buf), pos, len); 329 wpa_printf(MSG_INFO, " Value: %s", buf); 330 break; 331 332 case RADIUS_ATTR_INT32: 333 if (len == 4) 334 wpa_printf(MSG_INFO, " Value: %u", 335 WPA_GET_BE32(pos)); 336 else 337 wpa_printf(MSG_INFO, " Invalid INT32 length %d", 338 len); 339 break; 340 341 default: 342 break; 343 } 344 } 345 346 347 void radius_msg_dump(struct radius_msg *msg) 348 { 349 size_t i; 350 351 wpa_printf(MSG_INFO, "RADIUS message: code=%d (%s) identifier=%d length=%d", 352 msg->hdr->code, radius_code_string(msg->hdr->code), 353 msg->hdr->identifier, be_to_host16(msg->hdr->length)); 354 355 for (i = 0; i < msg->attr_used; i++) { 356 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i); 357 radius_msg_dump_attr(attr); 358 } 359 } 360 361 362 int radius_msg_finish(struct radius_msg *msg, const u8 *secret, 363 size_t secret_len) 364 { 365 if (secret) { 366 u8 auth[MD5_MAC_LEN]; 367 struct radius_attr_hdr *attr; 368 369 os_memset(auth, 0, MD5_MAC_LEN); 370 attr = radius_msg_add_attr(msg, 371 RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 372 auth, MD5_MAC_LEN); 373 if (attr == NULL) { 374 wpa_printf(MSG_WARNING, "RADIUS: Could not add " 375 "Message-Authenticator"); 376 return -1; 377 } 378 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 379 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 380 wpabuf_len(msg->buf), (u8 *) (attr + 1)); 381 } else 382 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 383 384 if (wpabuf_len(msg->buf) > 0xffff) { 385 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)", 386 (unsigned long) wpabuf_len(msg->buf)); 387 return -1; 388 } 389 return 0; 390 } 391 392 393 int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret, 394 size_t secret_len, const u8 *req_authenticator) 395 { 396 u8 auth[MD5_MAC_LEN]; 397 struct radius_attr_hdr *attr; 398 const u8 *addr[4]; 399 size_t len[4]; 400 401 os_memset(auth, 0, MD5_MAC_LEN); 402 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 403 auth, MD5_MAC_LEN); 404 if (attr == NULL) { 405 wpa_printf(MSG_ERROR, "WARNING: Could not add Message-Authenticator"); 406 return -1; 407 } 408 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 409 os_memcpy(msg->hdr->authenticator, req_authenticator, 410 sizeof(msg->hdr->authenticator)); 411 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 412 wpabuf_len(msg->buf), (u8 *) (attr + 1)); 413 414 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */ 415 addr[0] = (u8 *) msg->hdr; 416 len[0] = 1 + 1 + 2; 417 addr[1] = req_authenticator; 418 len[1] = MD5_MAC_LEN; 419 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr); 420 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 421 addr[3] = secret; 422 len[3] = secret_len; 423 md5_vector(4, addr, len, msg->hdr->authenticator); 424 425 if (wpabuf_len(msg->buf) > 0xffff) { 426 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)", 427 (unsigned long) wpabuf_len(msg->buf)); 428 return -1; 429 } 430 return 0; 431 } 432 433 434 int radius_msg_finish_das_resp(struct radius_msg *msg, const u8 *secret, 435 size_t secret_len, 436 const struct radius_hdr *req_hdr) 437 { 438 const u8 *addr[2]; 439 size_t len[2]; 440 u8 auth[MD5_MAC_LEN]; 441 struct radius_attr_hdr *attr; 442 443 os_memset(auth, 0, MD5_MAC_LEN); 444 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 445 auth, MD5_MAC_LEN); 446 if (attr == NULL) { 447 wpa_printf(MSG_WARNING, "Could not add Message-Authenticator"); 448 return -1; 449 } 450 451 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 452 os_memcpy(msg->hdr->authenticator, req_hdr->authenticator, 16); 453 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 454 wpabuf_len(msg->buf), (u8 *) (attr + 1)); 455 456 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */ 457 addr[0] = wpabuf_head_u8(msg->buf); 458 len[0] = wpabuf_len(msg->buf); 459 addr[1] = secret; 460 len[1] = secret_len; 461 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0) 462 return -1; 463 464 if (wpabuf_len(msg->buf) > 0xffff) { 465 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)", 466 (unsigned long) wpabuf_len(msg->buf)); 467 return -1; 468 } 469 return 0; 470 } 471 472 473 void radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret, 474 size_t secret_len) 475 { 476 const u8 *addr[2]; 477 size_t len[2]; 478 479 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 480 os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN); 481 addr[0] = wpabuf_head(msg->buf); 482 len[0] = wpabuf_len(msg->buf); 483 addr[1] = secret; 484 len[1] = secret_len; 485 md5_vector(2, addr, len, msg->hdr->authenticator); 486 487 if (wpabuf_len(msg->buf) > 0xffff) { 488 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)", 489 (unsigned long) wpabuf_len(msg->buf)); 490 } 491 } 492 493 494 void radius_msg_finish_acct_resp(struct radius_msg *msg, const u8 *secret, 495 size_t secret_len, const u8 *req_authenticator) 496 { 497 const u8 *addr[2]; 498 size_t len[2]; 499 500 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 501 os_memcpy(msg->hdr->authenticator, req_authenticator, MD5_MAC_LEN); 502 addr[0] = wpabuf_head(msg->buf); 503 len[0] = wpabuf_len(msg->buf); 504 addr[1] = secret; 505 len[1] = secret_len; 506 md5_vector(2, addr, len, msg->hdr->authenticator); 507 508 if (wpabuf_len(msg->buf) > 0xffff) { 509 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)", 510 (unsigned long) wpabuf_len(msg->buf)); 511 } 512 } 513 514 515 int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret, 516 size_t secret_len) 517 { 518 const u8 *addr[4]; 519 size_t len[4]; 520 u8 zero[MD5_MAC_LEN]; 521 u8 hash[MD5_MAC_LEN]; 522 523 os_memset(zero, 0, sizeof(zero)); 524 addr[0] = (u8 *) msg->hdr; 525 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN; 526 addr[1] = zero; 527 len[1] = MD5_MAC_LEN; 528 addr[2] = (u8 *) (msg->hdr + 1); 529 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 530 addr[3] = secret; 531 len[3] = secret_len; 532 md5_vector(4, addr, len, hash); 533 return os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0; 534 } 535 536 537 int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret, 538 size_t secret_len) 539 { 540 const u8 *addr[4]; 541 size_t len[4]; 542 u8 zero[MD5_MAC_LEN]; 543 u8 hash[MD5_MAC_LEN]; 544 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN]; 545 u8 orig_authenticator[16]; 546 547 struct radius_attr_hdr *attr = NULL, *tmp; 548 size_t i; 549 550 os_memset(zero, 0, sizeof(zero)); 551 addr[0] = (u8 *) msg->hdr; 552 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN; 553 addr[1] = zero; 554 len[1] = MD5_MAC_LEN; 555 addr[2] = (u8 *) (msg->hdr + 1); 556 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 557 addr[3] = secret; 558 len[3] = secret_len; 559 md5_vector(4, addr, len, hash); 560 if (os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0) 561 return 1; 562 563 for (i = 0; i < msg->attr_used; i++) { 564 tmp = radius_get_attr_hdr(msg, i); 565 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) { 566 if (attr != NULL) { 567 wpa_printf(MSG_WARNING, "Multiple " 568 "Message-Authenticator attributes " 569 "in RADIUS message"); 570 return 1; 571 } 572 attr = tmp; 573 } 574 } 575 576 if (attr == NULL) { 577 /* Message-Authenticator is MAY; not required */ 578 return 0; 579 } 580 581 os_memcpy(orig, attr + 1, MD5_MAC_LEN); 582 os_memset(attr + 1, 0, MD5_MAC_LEN); 583 os_memcpy(orig_authenticator, msg->hdr->authenticator, 584 sizeof(orig_authenticator)); 585 os_memset(msg->hdr->authenticator, 0, 586 sizeof(msg->hdr->authenticator)); 587 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 588 wpabuf_len(msg->buf), auth); 589 os_memcpy(attr + 1, orig, MD5_MAC_LEN); 590 os_memcpy(msg->hdr->authenticator, orig_authenticator, 591 sizeof(orig_authenticator)); 592 593 return os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0; 594 } 595 596 597 static int radius_msg_add_attr_to_array(struct radius_msg *msg, 598 struct radius_attr_hdr *attr) 599 { 600 if (msg->attr_used >= msg->attr_size) { 601 size_t *nattr_pos; 602 int nlen = msg->attr_size * 2; 603 604 nattr_pos = os_realloc_array(msg->attr_pos, nlen, 605 sizeof(*msg->attr_pos)); 606 if (nattr_pos == NULL) 607 return -1; 608 609 msg->attr_pos = nattr_pos; 610 msg->attr_size = nlen; 611 } 612 613 msg->attr_pos[msg->attr_used++] = 614 (unsigned char *) attr - wpabuf_head_u8(msg->buf); 615 616 return 0; 617 } 618 619 620 struct radius_attr_hdr *radius_msg_add_attr(struct radius_msg *msg, u8 type, 621 const u8 *data, size_t data_len) 622 { 623 size_t buf_needed; 624 struct radius_attr_hdr *attr; 625 626 if (data_len > RADIUS_MAX_ATTR_LEN) { 627 wpa_printf(MSG_ERROR, "radius_msg_add_attr: too long attribute (%lu bytes)", 628 (unsigned long) data_len); 629 return NULL; 630 } 631 632 buf_needed = sizeof(*attr) + data_len; 633 634 if (wpabuf_tailroom(msg->buf) < buf_needed) { 635 /* allocate more space for message buffer */ 636 if (wpabuf_resize(&msg->buf, buf_needed) < 0) 637 return NULL; 638 msg->hdr = wpabuf_mhead(msg->buf); 639 } 640 641 attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr)); 642 attr->type = type; 643 attr->length = sizeof(*attr) + data_len; 644 wpabuf_put_data(msg->buf, data, data_len); 645 646 if (radius_msg_add_attr_to_array(msg, attr)) 647 return NULL; 648 649 return attr; 650 } 651 652 653 /** 654 * radius_msg_parse - Parse a RADIUS message 655 * @data: RADIUS message to be parsed 656 * @len: Length of data buffer in octets 657 * Returns: Parsed RADIUS message or %NULL on failure 658 * 659 * This parses a RADIUS message and makes a copy of its data. The caller is 660 * responsible for freeing the returned data with radius_msg_free(). 661 */ 662 struct radius_msg * radius_msg_parse(const u8 *data, size_t len) 663 { 664 struct radius_msg *msg; 665 struct radius_hdr *hdr; 666 struct radius_attr_hdr *attr; 667 size_t msg_len; 668 unsigned char *pos, *end; 669 670 if (data == NULL || len < sizeof(*hdr)) 671 return NULL; 672 673 hdr = (struct radius_hdr *) data; 674 675 msg_len = be_to_host16(hdr->length); 676 if (msg_len < sizeof(*hdr) || msg_len > len) { 677 wpa_printf(MSG_INFO, "RADIUS: Invalid message length"); 678 return NULL; 679 } 680 681 if (msg_len < len) { 682 wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after " 683 "RADIUS message", (unsigned long) len - msg_len); 684 } 685 686 msg = os_zalloc(sizeof(*msg)); 687 if (msg == NULL) 688 return NULL; 689 690 msg->buf = wpabuf_alloc_copy(data, msg_len); 691 if (msg->buf == NULL || radius_msg_initialize(msg)) { 692 radius_msg_free(msg); 693 return NULL; 694 } 695 msg->hdr = wpabuf_mhead(msg->buf); 696 697 /* parse attributes */ 698 pos = wpabuf_mhead_u8(msg->buf) + sizeof(struct radius_hdr); 699 end = wpabuf_mhead_u8(msg->buf) + wpabuf_len(msg->buf); 700 while (pos < end) { 701 if ((size_t) (end - pos) < sizeof(*attr)) 702 goto fail; 703 704 attr = (struct radius_attr_hdr *) pos; 705 706 if (pos + attr->length > end || attr->length < sizeof(*attr)) 707 goto fail; 708 709 /* TODO: check that attr->length is suitable for attr->type */ 710 711 if (radius_msg_add_attr_to_array(msg, attr)) 712 goto fail; 713 714 pos += attr->length; 715 } 716 717 return msg; 718 719 fail: 720 radius_msg_free(msg); 721 return NULL; 722 } 723 724 725 int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len) 726 { 727 const u8 *pos = data; 728 size_t left = data_len; 729 730 while (left > 0) { 731 int len; 732 if (left > RADIUS_MAX_ATTR_LEN) 733 len = RADIUS_MAX_ATTR_LEN; 734 else 735 len = left; 736 737 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE, 738 pos, len)) 739 return 0; 740 741 pos += len; 742 left -= len; 743 } 744 745 return 1; 746 } 747 748 749 struct wpabuf * radius_msg_get_eap(struct radius_msg *msg) 750 { 751 struct wpabuf *eap; 752 size_t len, i; 753 struct radius_attr_hdr *attr; 754 755 if (msg == NULL) 756 return NULL; 757 758 len = 0; 759 for (i = 0; i < msg->attr_used; i++) { 760 attr = radius_get_attr_hdr(msg, i); 761 if (attr->type == RADIUS_ATTR_EAP_MESSAGE && 762 attr->length > sizeof(struct radius_attr_hdr)) 763 len += attr->length - sizeof(struct radius_attr_hdr); 764 } 765 766 if (len == 0) 767 return NULL; 768 769 eap = wpabuf_alloc(len); 770 if (eap == NULL) 771 return NULL; 772 773 for (i = 0; i < msg->attr_used; i++) { 774 attr = radius_get_attr_hdr(msg, i); 775 if (attr->type == RADIUS_ATTR_EAP_MESSAGE && 776 attr->length > sizeof(struct radius_attr_hdr)) { 777 int flen = attr->length - sizeof(*attr); 778 wpabuf_put_data(eap, attr + 1, flen); 779 } 780 } 781 782 return eap; 783 } 784 785 786 int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret, 787 size_t secret_len, const u8 *req_auth) 788 { 789 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN]; 790 u8 orig_authenticator[16]; 791 struct radius_attr_hdr *attr = NULL, *tmp; 792 size_t i; 793 794 for (i = 0; i < msg->attr_used; i++) { 795 tmp = radius_get_attr_hdr(msg, i); 796 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) { 797 if (attr != NULL) { 798 wpa_printf(MSG_INFO, "Multiple Message-Authenticator attributes in RADIUS message"); 799 return 1; 800 } 801 attr = tmp; 802 } 803 } 804 805 if (attr == NULL) { 806 wpa_printf(MSG_INFO, "No Message-Authenticator attribute found"); 807 return 1; 808 } 809 810 os_memcpy(orig, attr + 1, MD5_MAC_LEN); 811 os_memset(attr + 1, 0, MD5_MAC_LEN); 812 if (req_auth) { 813 os_memcpy(orig_authenticator, msg->hdr->authenticator, 814 sizeof(orig_authenticator)); 815 os_memcpy(msg->hdr->authenticator, req_auth, 816 sizeof(msg->hdr->authenticator)); 817 } 818 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 819 wpabuf_len(msg->buf), auth); 820 os_memcpy(attr + 1, orig, MD5_MAC_LEN); 821 if (req_auth) { 822 os_memcpy(msg->hdr->authenticator, orig_authenticator, 823 sizeof(orig_authenticator)); 824 } 825 826 if (os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0) { 827 wpa_printf(MSG_INFO, "Invalid Message-Authenticator!"); 828 return 1; 829 } 830 831 return 0; 832 } 833 834 835 int radius_msg_verify(struct radius_msg *msg, const u8 *secret, 836 size_t secret_len, struct radius_msg *sent_msg, int auth) 837 { 838 const u8 *addr[4]; 839 size_t len[4]; 840 u8 hash[MD5_MAC_LEN]; 841 842 if (sent_msg == NULL) { 843 wpa_printf(MSG_INFO, "No matching Access-Request message found"); 844 return 1; 845 } 846 847 if (auth && 848 radius_msg_verify_msg_auth(msg, secret, secret_len, 849 sent_msg->hdr->authenticator)) { 850 return 1; 851 } 852 853 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */ 854 addr[0] = (u8 *) msg->hdr; 855 len[0] = 1 + 1 + 2; 856 addr[1] = sent_msg->hdr->authenticator; 857 len[1] = MD5_MAC_LEN; 858 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr); 859 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 860 addr[3] = secret; 861 len[3] = secret_len; 862 md5_vector(4, addr, len, hash); 863 if (os_memcmp_const(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) { 864 wpa_printf(MSG_INFO, "Response Authenticator invalid!"); 865 return 1; 866 } 867 868 return 0; 869 } 870 871 872 int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src, 873 u8 type) 874 { 875 struct radius_attr_hdr *attr; 876 size_t i; 877 int count = 0; 878 879 for (i = 0; i < src->attr_used; i++) { 880 attr = radius_get_attr_hdr(src, i); 881 if (attr->type == type && attr->length >= sizeof(*attr)) { 882 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1), 883 attr->length - sizeof(*attr))) 884 return -1; 885 count++; 886 } 887 } 888 889 return count; 890 } 891 892 893 /* Create Request Authenticator. The value should be unique over the lifetime 894 * of the shared secret between authenticator and authentication server. 895 * Use one-way MD5 hash calculated from current timestamp and some data given 896 * by the caller. */ 897 void radius_msg_make_authenticator(struct radius_msg *msg, 898 const u8 *data, size_t len) 899 { 900 struct os_time tv; 901 long int l; 902 const u8 *addr[3]; 903 size_t elen[3]; 904 905 os_get_time(&tv); 906 l = os_random(); 907 addr[0] = (u8 *) &tv; 908 elen[0] = sizeof(tv); 909 addr[1] = data; 910 elen[1] = len; 911 addr[2] = (u8 *) &l; 912 elen[2] = sizeof(l); 913 md5_vector(3, addr, elen, msg->hdr->authenticator); 914 } 915 916 917 /* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message. 918 * Returns the Attribute payload and sets alen to indicate the length of the 919 * payload if a vendor attribute with subtype is found, otherwise returns NULL. 920 * The returned payload is allocated with os_malloc() and caller must free it 921 * by calling os_free(). 922 */ 923 static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor, 924 u8 subtype, size_t *alen) 925 { 926 u8 *data, *pos; 927 size_t i, len; 928 929 if (msg == NULL) 930 return NULL; 931 932 for (i = 0; i < msg->attr_used; i++) { 933 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i); 934 size_t left; 935 u32 vendor_id; 936 struct radius_attr_vendor *vhdr; 937 938 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC || 939 attr->length < sizeof(*attr)) 940 continue; 941 942 left = attr->length - sizeof(*attr); 943 if (left < 4) 944 continue; 945 946 pos = (u8 *) (attr + 1); 947 948 os_memcpy(&vendor_id, pos, 4); 949 pos += 4; 950 left -= 4; 951 952 if (ntohl(vendor_id) != vendor) 953 continue; 954 955 while (left >= sizeof(*vhdr)) { 956 vhdr = (struct radius_attr_vendor *) pos; 957 if (vhdr->vendor_length > left || 958 vhdr->vendor_length < sizeof(*vhdr)) { 959 break; 960 } 961 if (vhdr->vendor_type != subtype) { 962 pos += vhdr->vendor_length; 963 left -= vhdr->vendor_length; 964 continue; 965 } 966 967 len = vhdr->vendor_length - sizeof(*vhdr); 968 data = os_malloc(len); 969 if (data == NULL) 970 return NULL; 971 os_memcpy(data, pos + sizeof(*vhdr), len); 972 if (alen) 973 *alen = len; 974 return data; 975 } 976 } 977 978 return NULL; 979 } 980 981 982 static u8 * decrypt_ms_key(const u8 *key, size_t len, 983 const u8 *req_authenticator, 984 const u8 *secret, size_t secret_len, size_t *reslen) 985 { 986 u8 *plain, *ppos, *res; 987 const u8 *pos; 988 size_t left, plen; 989 u8 hash[MD5_MAC_LEN]; 990 int i, first = 1; 991 const u8 *addr[3]; 992 size_t elen[3]; 993 994 /* key: 16-bit salt followed by encrypted key info */ 995 996 if (len < 2 + 16) { 997 wpa_printf(MSG_DEBUG, "RADIUS: %s: Len is too small: %d", 998 __func__, (int) len); 999 return NULL; 1000 } 1001 1002 pos = key + 2; 1003 left = len - 2; 1004 if (left % 16) { 1005 wpa_printf(MSG_INFO, "RADIUS: Invalid ms key len %lu", 1006 (unsigned long) left); 1007 return NULL; 1008 } 1009 1010 plen = left; 1011 ppos = plain = os_malloc(plen); 1012 if (plain == NULL) 1013 return NULL; 1014 plain[0] = 0; 1015 1016 while (left > 0) { 1017 /* b(1) = MD5(Secret + Request-Authenticator + Salt) 1018 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */ 1019 1020 addr[0] = secret; 1021 elen[0] = secret_len; 1022 if (first) { 1023 addr[1] = req_authenticator; 1024 elen[1] = MD5_MAC_LEN; 1025 addr[2] = key; 1026 elen[2] = 2; /* Salt */ 1027 } else { 1028 addr[1] = pos - MD5_MAC_LEN; 1029 elen[1] = MD5_MAC_LEN; 1030 } 1031 md5_vector(first ? 3 : 2, addr, elen, hash); 1032 first = 0; 1033 1034 for (i = 0; i < MD5_MAC_LEN; i++) 1035 *ppos++ = *pos++ ^ hash[i]; 1036 left -= MD5_MAC_LEN; 1037 } 1038 1039 if (plain[0] == 0 || plain[0] > plen - 1) { 1040 wpa_printf(MSG_INFO, "RADIUS: Failed to decrypt MPPE key"); 1041 os_free(plain); 1042 return NULL; 1043 } 1044 1045 res = os_malloc(plain[0]); 1046 if (res == NULL) { 1047 os_free(plain); 1048 return NULL; 1049 } 1050 os_memcpy(res, plain + 1, plain[0]); 1051 if (reslen) 1052 *reslen = plain[0]; 1053 os_free(plain); 1054 return res; 1055 } 1056 1057 1058 static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt, 1059 const u8 *req_authenticator, 1060 const u8 *secret, size_t secret_len, 1061 u8 *ebuf, size_t *elen) 1062 { 1063 int i, len, first = 1; 1064 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos; 1065 const u8 *addr[3]; 1066 size_t _len[3]; 1067 1068 WPA_PUT_BE16(saltbuf, salt); 1069 1070 len = 1 + key_len; 1071 if (len & 0x0f) { 1072 len = (len & 0xf0) + 16; 1073 } 1074 os_memset(ebuf, 0, len); 1075 ebuf[0] = key_len; 1076 os_memcpy(ebuf + 1, key, key_len); 1077 1078 *elen = len; 1079 1080 pos = ebuf; 1081 while (len > 0) { 1082 /* b(1) = MD5(Secret + Request-Authenticator + Salt) 1083 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */ 1084 addr[0] = secret; 1085 _len[0] = secret_len; 1086 if (first) { 1087 addr[1] = req_authenticator; 1088 _len[1] = MD5_MAC_LEN; 1089 addr[2] = saltbuf; 1090 _len[2] = sizeof(saltbuf); 1091 } else { 1092 addr[1] = pos - MD5_MAC_LEN; 1093 _len[1] = MD5_MAC_LEN; 1094 } 1095 md5_vector(first ? 3 : 2, addr, _len, hash); 1096 first = 0; 1097 1098 for (i = 0; i < MD5_MAC_LEN; i++) 1099 *pos++ ^= hash[i]; 1100 1101 len -= MD5_MAC_LEN; 1102 } 1103 } 1104 1105 1106 struct radius_ms_mppe_keys * 1107 radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg, 1108 const u8 *secret, size_t secret_len) 1109 { 1110 u8 *key; 1111 size_t keylen; 1112 struct radius_ms_mppe_keys *keys; 1113 1114 if (msg == NULL || sent_msg == NULL) 1115 return NULL; 1116 1117 keys = os_zalloc(sizeof(*keys)); 1118 if (keys == NULL) 1119 return NULL; 1120 1121 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT, 1122 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY, 1123 &keylen); 1124 if (key) { 1125 keys->send = decrypt_ms_key(key, keylen, 1126 sent_msg->hdr->authenticator, 1127 secret, secret_len, 1128 &keys->send_len); 1129 if (!keys->send) { 1130 wpa_printf(MSG_DEBUG, 1131 "RADIUS: Failed to decrypt send key"); 1132 } 1133 os_free(key); 1134 } 1135 1136 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT, 1137 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY, 1138 &keylen); 1139 if (key) { 1140 keys->recv = decrypt_ms_key(key, keylen, 1141 sent_msg->hdr->authenticator, 1142 secret, secret_len, 1143 &keys->recv_len); 1144 if (!keys->recv) { 1145 wpa_printf(MSG_DEBUG, 1146 "RADIUS: Failed to decrypt recv key"); 1147 } 1148 os_free(key); 1149 } 1150 1151 return keys; 1152 } 1153 1154 1155 struct radius_ms_mppe_keys * 1156 radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg, 1157 const u8 *secret, size_t secret_len) 1158 { 1159 u8 *key; 1160 size_t keylen; 1161 struct radius_ms_mppe_keys *keys; 1162 1163 if (msg == NULL || sent_msg == NULL) 1164 return NULL; 1165 1166 keys = os_zalloc(sizeof(*keys)); 1167 if (keys == NULL) 1168 return NULL; 1169 1170 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO, 1171 RADIUS_CISCO_AV_PAIR, &keylen); 1172 if (key && keylen == 51 && 1173 os_memcmp(key, "leap:session-key=", 17) == 0) { 1174 keys->recv = decrypt_ms_key(key + 17, keylen - 17, 1175 sent_msg->hdr->authenticator, 1176 secret, secret_len, 1177 &keys->recv_len); 1178 } 1179 os_free(key); 1180 1181 return keys; 1182 } 1183 1184 1185 int radius_msg_add_mppe_keys(struct radius_msg *msg, 1186 const u8 *req_authenticator, 1187 const u8 *secret, size_t secret_len, 1188 const u8 *send_key, size_t send_key_len, 1189 const u8 *recv_key, size_t recv_key_len) 1190 { 1191 struct radius_attr_hdr *attr; 1192 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT); 1193 u8 *buf; 1194 struct radius_attr_vendor *vhdr; 1195 u8 *pos; 1196 size_t elen; 1197 int hlen; 1198 u16 salt; 1199 1200 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2; 1201 1202 /* MS-MPPE-Send-Key */ 1203 buf = os_malloc(hlen + send_key_len + 16); 1204 if (buf == NULL) { 1205 return 0; 1206 } 1207 pos = buf; 1208 os_memcpy(pos, &vendor_id, sizeof(vendor_id)); 1209 pos += sizeof(vendor_id); 1210 vhdr = (struct radius_attr_vendor *) pos; 1211 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY; 1212 pos = (u8 *) (vhdr + 1); 1213 salt = os_random() | 0x8000; 1214 WPA_PUT_BE16(pos, salt); 1215 pos += 2; 1216 encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret, 1217 secret_len, pos, &elen); 1218 vhdr->vendor_length = hlen + elen - sizeof(vendor_id); 1219 1220 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC, 1221 buf, hlen + elen); 1222 os_free(buf); 1223 if (attr == NULL) { 1224 return 0; 1225 } 1226 1227 /* MS-MPPE-Recv-Key */ 1228 buf = os_malloc(hlen + recv_key_len + 16); 1229 if (buf == NULL) { 1230 return 0; 1231 } 1232 pos = buf; 1233 os_memcpy(pos, &vendor_id, sizeof(vendor_id)); 1234 pos += sizeof(vendor_id); 1235 vhdr = (struct radius_attr_vendor *) pos; 1236 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY; 1237 pos = (u8 *) (vhdr + 1); 1238 salt ^= 1; 1239 WPA_PUT_BE16(pos, salt); 1240 pos += 2; 1241 encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret, 1242 secret_len, pos, &elen); 1243 vhdr->vendor_length = hlen + elen - sizeof(vendor_id); 1244 1245 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC, 1246 buf, hlen + elen); 1247 os_free(buf); 1248 if (attr == NULL) { 1249 return 0; 1250 } 1251 1252 return 1; 1253 } 1254 1255 1256 int radius_msg_add_wfa(struct radius_msg *msg, u8 subtype, const u8 *data, 1257 size_t len) 1258 { 1259 struct radius_attr_hdr *attr; 1260 u8 *buf, *pos; 1261 size_t alen; 1262 1263 alen = 4 + 2 + len; 1264 buf = os_malloc(alen); 1265 if (buf == NULL) 1266 return 0; 1267 pos = buf; 1268 WPA_PUT_BE32(pos, RADIUS_VENDOR_ID_WFA); 1269 pos += 4; 1270 *pos++ = subtype; 1271 *pos++ = 2 + len; 1272 os_memcpy(pos, data, len); 1273 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC, 1274 buf, alen); 1275 os_free(buf); 1276 if (attr == NULL) 1277 return 0; 1278 1279 return 1; 1280 } 1281 1282 1283 int radius_user_password_hide(struct radius_msg *msg, 1284 const u8 *data, size_t data_len, 1285 const u8 *secret, size_t secret_len, 1286 u8 *buf, size_t buf_len) 1287 { 1288 size_t padlen, i, pos; 1289 const u8 *addr[2]; 1290 size_t len[2]; 1291 u8 hash[16]; 1292 1293 if (data_len + 16 > buf_len) 1294 return -1; 1295 1296 os_memcpy(buf, data, data_len); 1297 1298 padlen = data_len % 16; 1299 if (padlen && data_len < buf_len) { 1300 padlen = 16 - padlen; 1301 os_memset(buf + data_len, 0, padlen); 1302 buf_len = data_len + padlen; 1303 } else { 1304 buf_len = data_len; 1305 } 1306 1307 addr[0] = secret; 1308 len[0] = secret_len; 1309 addr[1] = msg->hdr->authenticator; 1310 len[1] = 16; 1311 md5_vector(2, addr, len, hash); 1312 1313 for (i = 0; i < 16; i++) 1314 buf[i] ^= hash[i]; 1315 pos = 16; 1316 1317 while (pos < buf_len) { 1318 addr[0] = secret; 1319 len[0] = secret_len; 1320 addr[1] = &buf[pos - 16]; 1321 len[1] = 16; 1322 md5_vector(2, addr, len, hash); 1323 1324 for (i = 0; i < 16; i++) 1325 buf[pos + i] ^= hash[i]; 1326 1327 pos += 16; 1328 } 1329 1330 return buf_len; 1331 } 1332 1333 1334 /* Add User-Password attribute to a RADIUS message and encrypt it as specified 1335 * in RFC 2865, Chap. 5.2 */ 1336 struct radius_attr_hdr * 1337 radius_msg_add_attr_user_password(struct radius_msg *msg, 1338 const u8 *data, size_t data_len, 1339 const u8 *secret, size_t secret_len) 1340 { 1341 u8 buf[128]; 1342 int res; 1343 1344 res = radius_user_password_hide(msg, data, data_len, 1345 secret, secret_len, buf, sizeof(buf)); 1346 if (res < 0) 1347 return NULL; 1348 1349 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD, 1350 buf, res); 1351 } 1352 1353 1354 int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len) 1355 { 1356 struct radius_attr_hdr *attr = NULL, *tmp; 1357 size_t i, dlen; 1358 1359 for (i = 0; i < msg->attr_used; i++) { 1360 tmp = radius_get_attr_hdr(msg, i); 1361 if (tmp->type == type) { 1362 attr = tmp; 1363 break; 1364 } 1365 } 1366 1367 if (!attr || attr->length < sizeof(*attr)) 1368 return -1; 1369 1370 dlen = attr->length - sizeof(*attr); 1371 if (buf) 1372 os_memcpy(buf, (attr + 1), dlen > len ? len : dlen); 1373 return dlen; 1374 } 1375 1376 1377 int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf, 1378 size_t *len, const u8 *start) 1379 { 1380 size_t i; 1381 struct radius_attr_hdr *attr = NULL, *tmp; 1382 1383 for (i = 0; i < msg->attr_used; i++) { 1384 tmp = radius_get_attr_hdr(msg, i); 1385 if (tmp->type == type && 1386 (start == NULL || (u8 *) tmp > start)) { 1387 attr = tmp; 1388 break; 1389 } 1390 } 1391 1392 if (!attr || attr->length < sizeof(*attr)) 1393 return -1; 1394 1395 *buf = (u8 *) (attr + 1); 1396 *len = attr->length - sizeof(*attr); 1397 return 0; 1398 } 1399 1400 1401 int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len) 1402 { 1403 size_t i; 1404 int count; 1405 1406 for (count = 0, i = 0; i < msg->attr_used; i++) { 1407 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i); 1408 if (attr->type == type && 1409 attr->length >= sizeof(struct radius_attr_hdr) + min_len) 1410 count++; 1411 } 1412 1413 return count; 1414 } 1415 1416 1417 struct radius_tunnel_attrs { 1418 int tag_used; 1419 int type; /* Tunnel-Type */ 1420 int medium_type; /* Tunnel-Medium-Type */ 1421 int vlanid; 1422 }; 1423 1424 1425 /** 1426 * radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information 1427 * @msg: RADIUS message 1428 * Returns: VLAN ID for the first tunnel configuration or 0 if none is found 1429 */ 1430 int radius_msg_get_vlanid(struct radius_msg *msg) 1431 { 1432 struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun; 1433 size_t i; 1434 struct radius_attr_hdr *attr = NULL; 1435 const u8 *data; 1436 char buf[10]; 1437 size_t dlen; 1438 1439 os_memset(&tunnel, 0, sizeof(tunnel)); 1440 1441 for (i = 0; i < msg->attr_used; i++) { 1442 attr = radius_get_attr_hdr(msg, i); 1443 if (attr->length < sizeof(*attr)) 1444 return -1; 1445 data = (const u8 *) (attr + 1); 1446 dlen = attr->length - sizeof(*attr); 1447 if (attr->length < 3) 1448 continue; 1449 if (data[0] >= RADIUS_TUNNEL_TAGS) 1450 tun = &tunnel[0]; 1451 else 1452 tun = &tunnel[data[0]]; 1453 1454 switch (attr->type) { 1455 case RADIUS_ATTR_TUNNEL_TYPE: 1456 if (attr->length != 6) 1457 break; 1458 tun->tag_used++; 1459 tun->type = WPA_GET_BE24(data + 1); 1460 break; 1461 case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE: 1462 if (attr->length != 6) 1463 break; 1464 tun->tag_used++; 1465 tun->medium_type = WPA_GET_BE24(data + 1); 1466 break; 1467 case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID: 1468 if (data[0] < RADIUS_TUNNEL_TAGS) { 1469 data++; 1470 dlen--; 1471 } 1472 if (dlen >= sizeof(buf)) 1473 break; 1474 os_memcpy(buf, data, dlen); 1475 buf[dlen] = '\0'; 1476 tun->tag_used++; 1477 tun->vlanid = atoi(buf); 1478 break; 1479 } 1480 } 1481 1482 for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) { 1483 tun = &tunnel[i]; 1484 if (tun->tag_used && 1485 tun->type == RADIUS_TUNNEL_TYPE_VLAN && 1486 tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 && 1487 tun->vlanid > 0) 1488 return tun->vlanid; 1489 } 1490 1491 return 0; 1492 } 1493 1494 1495 /** 1496 * radius_msg_get_tunnel_password - Parse RADIUS attribute Tunnel-Password 1497 * @msg: Received RADIUS message 1498 * @keylen: Length of returned password 1499 * @secret: RADIUS shared secret 1500 * @secret_len: Length of secret 1501 * @sent_msg: Sent RADIUS message 1502 * @n: Number of password attribute to return (starting with 0) 1503 * Returns: Pointer to n-th password (free with os_free) or %NULL 1504 */ 1505 char * radius_msg_get_tunnel_password(struct radius_msg *msg, int *keylen, 1506 const u8 *secret, size_t secret_len, 1507 struct radius_msg *sent_msg, size_t n) 1508 { 1509 u8 *buf = NULL; 1510 size_t buflen; 1511 const u8 *salt; 1512 u8 *str; 1513 const u8 *addr[3]; 1514 size_t len[3]; 1515 u8 hash[16]; 1516 u8 *pos; 1517 size_t i, j = 0; 1518 struct radius_attr_hdr *attr; 1519 const u8 *data; 1520 size_t dlen; 1521 const u8 *fdata = NULL; /* points to found item */ 1522 size_t fdlen = -1; 1523 char *ret = NULL; 1524 1525 /* find n-th valid Tunnel-Password attribute */ 1526 for (i = 0; i < msg->attr_used; i++) { 1527 attr = radius_get_attr_hdr(msg, i); 1528 if (attr == NULL || 1529 attr->type != RADIUS_ATTR_TUNNEL_PASSWORD) { 1530 continue; 1531 } 1532 if (attr->length <= 5) 1533 continue; 1534 data = (const u8 *) (attr + 1); 1535 dlen = attr->length - sizeof(*attr); 1536 if (dlen <= 3 || dlen % 16 != 3) 1537 continue; 1538 j++; 1539 if (j <= n) 1540 continue; 1541 1542 fdata = data; 1543 fdlen = dlen; 1544 break; 1545 } 1546 if (fdata == NULL) 1547 goto out; 1548 1549 /* alloc writable memory for decryption */ 1550 buf = os_malloc(fdlen); 1551 if (buf == NULL) 1552 goto out; 1553 os_memcpy(buf, fdata, fdlen); 1554 buflen = fdlen; 1555 1556 /* init pointers */ 1557 salt = buf + 1; 1558 str = buf + 3; 1559 1560 /* decrypt blocks */ 1561 pos = buf + buflen - 16; /* last block */ 1562 while (pos >= str + 16) { /* all but the first block */ 1563 addr[0] = secret; 1564 len[0] = secret_len; 1565 addr[1] = pos - 16; 1566 len[1] = 16; 1567 md5_vector(2, addr, len, hash); 1568 1569 for (i = 0; i < 16; i++) 1570 pos[i] ^= hash[i]; 1571 1572 pos -= 16; 1573 } 1574 1575 /* decrypt first block */ 1576 if (str != pos) 1577 goto out; 1578 addr[0] = secret; 1579 len[0] = secret_len; 1580 addr[1] = sent_msg->hdr->authenticator; 1581 len[1] = 16; 1582 addr[2] = salt; 1583 len[2] = 2; 1584 md5_vector(3, addr, len, hash); 1585 1586 for (i = 0; i < 16; i++) 1587 pos[i] ^= hash[i]; 1588 1589 /* derive plaintext length from first subfield */ 1590 *keylen = (unsigned char) str[0]; 1591 if ((u8 *) (str + *keylen) >= (u8 *) (buf + buflen)) { 1592 /* decryption error - invalid key length */ 1593 goto out; 1594 } 1595 if (*keylen == 0) { 1596 /* empty password */ 1597 goto out; 1598 } 1599 1600 /* copy passphrase into new buffer */ 1601 ret = os_malloc(*keylen); 1602 if (ret) 1603 os_memcpy(ret, str + 1, *keylen); 1604 1605 out: 1606 /* return new buffer */ 1607 os_free(buf); 1608 return ret; 1609 } 1610 1611 1612 void radius_free_class(struct radius_class_data *c) 1613 { 1614 size_t i; 1615 if (c == NULL) 1616 return; 1617 for (i = 0; i < c->count; i++) 1618 os_free(c->attr[i].data); 1619 os_free(c->attr); 1620 c->attr = NULL; 1621 c->count = 0; 1622 } 1623 1624 1625 int radius_copy_class(struct radius_class_data *dst, 1626 const struct radius_class_data *src) 1627 { 1628 size_t i; 1629 1630 if (src->attr == NULL) 1631 return 0; 1632 1633 dst->attr = os_calloc(src->count, sizeof(struct radius_attr_data)); 1634 if (dst->attr == NULL) 1635 return -1; 1636 1637 dst->count = 0; 1638 1639 for (i = 0; i < src->count; i++) { 1640 dst->attr[i].data = os_malloc(src->attr[i].len); 1641 if (dst->attr[i].data == NULL) 1642 break; 1643 dst->count++; 1644 os_memcpy(dst->attr[i].data, src->attr[i].data, 1645 src->attr[i].len); 1646 dst->attr[i].len = src->attr[i].len; 1647 } 1648 1649 return 0; 1650 } 1651 1652 1653 u8 radius_msg_find_unlisted_attr(struct radius_msg *msg, u8 *attrs) 1654 { 1655 size_t i, j; 1656 struct radius_attr_hdr *attr; 1657 1658 for (i = 0; i < msg->attr_used; i++) { 1659 attr = radius_get_attr_hdr(msg, i); 1660 1661 for (j = 0; attrs[j]; j++) { 1662 if (attr->type == attrs[j]) 1663 break; 1664 } 1665 1666 if (attrs[j] == 0) 1667 return attr->type; /* unlisted attr */ 1668 } 1669 1670 return 0; 1671 } 1672
