1 /* 2 * RADIUS message processing 3 * Copyright (c) 2002-2009, 2011-2015, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "utils/includes.h" 10 11 #include "utils/common.h" 12 #include "utils/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_SERVICE_TYPE, "Service-Type", RADIUS_ATTR_INT32 }, 177 { RADIUS_ATTR_FRAMED_IP_ADDRESS, "Framed-IP-Address", RADIUS_ATTR_IP }, 178 { RADIUS_ATTR_FRAMED_MTU, "Framed-MTU", RADIUS_ATTR_INT32 }, 179 { RADIUS_ATTR_REPLY_MESSAGE, "Reply-Message", RADIUS_ATTR_TEXT }, 180 { RADIUS_ATTR_STATE, "State", RADIUS_ATTR_UNDIST }, 181 { RADIUS_ATTR_CLASS, "Class", RADIUS_ATTR_UNDIST }, 182 { RADIUS_ATTR_VENDOR_SPECIFIC, "Vendor-Specific", RADIUS_ATTR_UNDIST }, 183 { RADIUS_ATTR_SESSION_TIMEOUT, "Session-Timeout", RADIUS_ATTR_INT32 }, 184 { RADIUS_ATTR_IDLE_TIMEOUT, "Idle-Timeout", RADIUS_ATTR_INT32 }, 185 { RADIUS_ATTR_TERMINATION_ACTION, "Termination-Action", 186 RADIUS_ATTR_INT32 }, 187 { RADIUS_ATTR_CALLED_STATION_ID, "Called-Station-Id", 188 RADIUS_ATTR_TEXT }, 189 { RADIUS_ATTR_CALLING_STATION_ID, "Calling-Station-Id", 190 RADIUS_ATTR_TEXT }, 191 { RADIUS_ATTR_NAS_IDENTIFIER, "NAS-Identifier", RADIUS_ATTR_TEXT }, 192 { RADIUS_ATTR_PROXY_STATE, "Proxy-State", RADIUS_ATTR_UNDIST }, 193 { RADIUS_ATTR_ACCT_STATUS_TYPE, "Acct-Status-Type", 194 RADIUS_ATTR_INT32 }, 195 { RADIUS_ATTR_ACCT_DELAY_TIME, "Acct-Delay-Time", RADIUS_ATTR_INT32 }, 196 { RADIUS_ATTR_ACCT_INPUT_OCTETS, "Acct-Input-Octets", 197 RADIUS_ATTR_INT32 }, 198 { RADIUS_ATTR_ACCT_OUTPUT_OCTETS, "Acct-Output-Octets", 199 RADIUS_ATTR_INT32 }, 200 { RADIUS_ATTR_ACCT_SESSION_ID, "Acct-Session-Id", RADIUS_ATTR_TEXT }, 201 { RADIUS_ATTR_ACCT_AUTHENTIC, "Acct-Authentic", RADIUS_ATTR_INT32 }, 202 { RADIUS_ATTR_ACCT_SESSION_TIME, "Acct-Session-Time", 203 RADIUS_ATTR_INT32 }, 204 { RADIUS_ATTR_ACCT_INPUT_PACKETS, "Acct-Input-Packets", 205 RADIUS_ATTR_INT32 }, 206 { RADIUS_ATTR_ACCT_OUTPUT_PACKETS, "Acct-Output-Packets", 207 RADIUS_ATTR_INT32 }, 208 { RADIUS_ATTR_ACCT_TERMINATE_CAUSE, "Acct-Terminate-Cause", 209 RADIUS_ATTR_INT32 }, 210 { RADIUS_ATTR_ACCT_MULTI_SESSION_ID, "Acct-Multi-Session-Id", 211 RADIUS_ATTR_TEXT }, 212 { RADIUS_ATTR_ACCT_LINK_COUNT, "Acct-Link-Count", RADIUS_ATTR_INT32 }, 213 { RADIUS_ATTR_ACCT_INPUT_GIGAWORDS, "Acct-Input-Gigawords", 214 RADIUS_ATTR_INT32 }, 215 { RADIUS_ATTR_ACCT_OUTPUT_GIGAWORDS, "Acct-Output-Gigawords", 216 RADIUS_ATTR_INT32 }, 217 { RADIUS_ATTR_EVENT_TIMESTAMP, "Event-Timestamp", 218 RADIUS_ATTR_INT32 }, 219 { RADIUS_ATTR_EGRESS_VLANID, "EGRESS-VLANID", RADIUS_ATTR_HEXDUMP }, 220 { RADIUS_ATTR_NAS_PORT_TYPE, "NAS-Port-Type", RADIUS_ATTR_INT32 }, 221 { RADIUS_ATTR_TUNNEL_TYPE, "Tunnel-Type", RADIUS_ATTR_HEXDUMP }, 222 { RADIUS_ATTR_TUNNEL_MEDIUM_TYPE, "Tunnel-Medium-Type", 223 RADIUS_ATTR_HEXDUMP }, 224 { RADIUS_ATTR_TUNNEL_PASSWORD, "Tunnel-Password", 225 RADIUS_ATTR_UNDIST }, 226 { RADIUS_ATTR_CONNECT_INFO, "Connect-Info", RADIUS_ATTR_TEXT }, 227 { RADIUS_ATTR_EAP_MESSAGE, "EAP-Message", RADIUS_ATTR_UNDIST }, 228 { RADIUS_ATTR_MESSAGE_AUTHENTICATOR, "Message-Authenticator", 229 RADIUS_ATTR_UNDIST }, 230 { RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID, "Tunnel-Private-Group-Id", 231 RADIUS_ATTR_HEXDUMP }, 232 { RADIUS_ATTR_ACCT_INTERIM_INTERVAL, "Acct-Interim-Interval", 233 RADIUS_ATTR_INT32 }, 234 { RADIUS_ATTR_CHARGEABLE_USER_IDENTITY, "Chargeable-User-Identity", 235 RADIUS_ATTR_TEXT }, 236 { RADIUS_ATTR_NAS_IPV6_ADDRESS, "NAS-IPv6-Address", RADIUS_ATTR_IPV6 }, 237 { RADIUS_ATTR_ERROR_CAUSE, "Error-Cause", RADIUS_ATTR_INT32 }, 238 { RADIUS_ATTR_EAP_KEY_NAME, "EAP-Key-Name", RADIUS_ATTR_HEXDUMP }, 239 { RADIUS_ATTR_OPERATOR_NAME, "Operator-Name", RADIUS_ATTR_TEXT }, 240 { RADIUS_ATTR_LOCATION_INFO, "Location-Information", 241 RADIUS_ATTR_HEXDUMP }, 242 { RADIUS_ATTR_LOCATION_DATA, "Location-Data", RADIUS_ATTR_HEXDUMP }, 243 { RADIUS_ATTR_BASIC_LOCATION_POLICY_RULES, 244 "Basic-Location-Policy-Rules", RADIUS_ATTR_HEXDUMP }, 245 { RADIUS_ATTR_EXTENDED_LOCATION_POLICY_RULES, 246 "Extended-Location-Policy-Rules", RADIUS_ATTR_HEXDUMP }, 247 { RADIUS_ATTR_LOCATION_CAPABLE, "Location-Capable", RADIUS_ATTR_INT32 }, 248 { RADIUS_ATTR_REQUESTED_LOCATION_INFO, "Requested-Location-Info", 249 RADIUS_ATTR_INT32 }, 250 { RADIUS_ATTR_MOBILITY_DOMAIN_ID, "Mobility-Domain-Id", 251 RADIUS_ATTR_INT32 }, 252 { RADIUS_ATTR_WLAN_HESSID, "WLAN-HESSID", RADIUS_ATTR_TEXT }, 253 { RADIUS_ATTR_WLAN_REASON_CODE, "WLAN-Reason-Code", 254 RADIUS_ATTR_INT32 }, 255 { RADIUS_ATTR_WLAN_PAIRWISE_CIPHER, "WLAN-Pairwise-Cipher", 256 RADIUS_ATTR_HEXDUMP }, 257 { RADIUS_ATTR_WLAN_GROUP_CIPHER, "WLAN-Group-Cipher", 258 RADIUS_ATTR_HEXDUMP }, 259 { RADIUS_ATTR_WLAN_AKM_SUITE, "WLAN-AKM-Suite", 260 RADIUS_ATTR_HEXDUMP }, 261 { RADIUS_ATTR_WLAN_GROUP_MGMT_CIPHER, "WLAN-Group-Mgmt-Pairwise-Cipher", 262 RADIUS_ATTR_HEXDUMP }, 263 }; 264 #define RADIUS_ATTRS ARRAY_SIZE(radius_attrs) 265 266 267 static const struct radius_attr_type *radius_get_attr_type(u8 type) 268 { 269 size_t i; 270 271 for (i = 0; i < RADIUS_ATTRS; i++) { 272 if (type == radius_attrs[i].type) 273 return &radius_attrs[i]; 274 } 275 276 return NULL; 277 } 278 279 280 static void radius_msg_dump_attr(struct radius_attr_hdr *hdr) 281 { 282 const struct radius_attr_type *attr; 283 int len; 284 unsigned char *pos; 285 char buf[1000]; 286 287 attr = radius_get_attr_type(hdr->type); 288 289 wpa_printf(MSG_INFO, " Attribute %d (%s) length=%d", 290 hdr->type, attr ? attr->name : "?Unknown?", hdr->length); 291 292 if (attr == NULL || hdr->length < sizeof(struct radius_attr_hdr)) 293 return; 294 295 len = hdr->length - sizeof(struct radius_attr_hdr); 296 pos = (unsigned char *) (hdr + 1); 297 298 switch (attr->data_type) { 299 case RADIUS_ATTR_TEXT: 300 printf_encode(buf, sizeof(buf), pos, len); 301 wpa_printf(MSG_INFO, " Value: '%s'", buf); 302 break; 303 304 case RADIUS_ATTR_IP: 305 if (len == 4) { 306 struct in_addr addr; 307 os_memcpy(&addr, pos, 4); 308 wpa_printf(MSG_INFO, " Value: %s", 309 inet_ntoa(addr)); 310 } else { 311 wpa_printf(MSG_INFO, " Invalid IP address length %d", 312 len); 313 } 314 break; 315 316 #ifdef CONFIG_IPV6 317 case RADIUS_ATTR_IPV6: 318 if (len == 16) { 319 const char *atxt; 320 struct in6_addr *addr = (struct in6_addr *) pos; 321 atxt = inet_ntop(AF_INET6, addr, buf, sizeof(buf)); 322 wpa_printf(MSG_INFO, " Value: %s", 323 atxt ? atxt : "?"); 324 } else { 325 wpa_printf(MSG_INFO, " Invalid IPv6 address length %d", 326 len); 327 } 328 break; 329 #endif /* CONFIG_IPV6 */ 330 331 case RADIUS_ATTR_HEXDUMP: 332 case RADIUS_ATTR_UNDIST: 333 wpa_snprintf_hex(buf, sizeof(buf), pos, len); 334 wpa_printf(MSG_INFO, " Value: %s", buf); 335 break; 336 337 case RADIUS_ATTR_INT32: 338 if (len == 4) 339 wpa_printf(MSG_INFO, " Value: %u", 340 WPA_GET_BE32(pos)); 341 else 342 wpa_printf(MSG_INFO, " Invalid INT32 length %d", 343 len); 344 break; 345 346 default: 347 break; 348 } 349 } 350 351 352 void radius_msg_dump(struct radius_msg *msg) 353 { 354 size_t i; 355 356 wpa_printf(MSG_INFO, "RADIUS message: code=%d (%s) identifier=%d length=%d", 357 msg->hdr->code, radius_code_string(msg->hdr->code), 358 msg->hdr->identifier, be_to_host16(msg->hdr->length)); 359 360 for (i = 0; i < msg->attr_used; i++) { 361 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i); 362 radius_msg_dump_attr(attr); 363 } 364 } 365 366 367 int radius_msg_finish(struct radius_msg *msg, const u8 *secret, 368 size_t secret_len) 369 { 370 if (secret) { 371 u8 auth[MD5_MAC_LEN]; 372 struct radius_attr_hdr *attr; 373 374 os_memset(auth, 0, MD5_MAC_LEN); 375 attr = radius_msg_add_attr(msg, 376 RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 377 auth, MD5_MAC_LEN); 378 if (attr == NULL) { 379 wpa_printf(MSG_WARNING, "RADIUS: Could not add " 380 "Message-Authenticator"); 381 return -1; 382 } 383 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 384 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 385 wpabuf_len(msg->buf), (u8 *) (attr + 1)); 386 } else 387 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 388 389 if (wpabuf_len(msg->buf) > 0xffff) { 390 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)", 391 (unsigned long) wpabuf_len(msg->buf)); 392 return -1; 393 } 394 return 0; 395 } 396 397 398 int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret, 399 size_t secret_len, const u8 *req_authenticator) 400 { 401 u8 auth[MD5_MAC_LEN]; 402 struct radius_attr_hdr *attr; 403 const u8 *addr[4]; 404 size_t len[4]; 405 406 os_memset(auth, 0, MD5_MAC_LEN); 407 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 408 auth, MD5_MAC_LEN); 409 if (attr == NULL) { 410 wpa_printf(MSG_ERROR, "WARNING: Could not add Message-Authenticator"); 411 return -1; 412 } 413 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 414 os_memcpy(msg->hdr->authenticator, req_authenticator, 415 sizeof(msg->hdr->authenticator)); 416 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 417 wpabuf_len(msg->buf), (u8 *) (attr + 1)); 418 419 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */ 420 addr[0] = (u8 *) msg->hdr; 421 len[0] = 1 + 1 + 2; 422 addr[1] = req_authenticator; 423 len[1] = MD5_MAC_LEN; 424 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr); 425 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 426 addr[3] = secret; 427 len[3] = secret_len; 428 md5_vector(4, addr, len, msg->hdr->authenticator); 429 430 if (wpabuf_len(msg->buf) > 0xffff) { 431 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)", 432 (unsigned long) wpabuf_len(msg->buf)); 433 return -1; 434 } 435 return 0; 436 } 437 438 439 int radius_msg_finish_das_resp(struct radius_msg *msg, const u8 *secret, 440 size_t secret_len, 441 const struct radius_hdr *req_hdr) 442 { 443 const u8 *addr[2]; 444 size_t len[2]; 445 u8 auth[MD5_MAC_LEN]; 446 struct radius_attr_hdr *attr; 447 448 os_memset(auth, 0, MD5_MAC_LEN); 449 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 450 auth, MD5_MAC_LEN); 451 if (attr == NULL) { 452 wpa_printf(MSG_WARNING, "Could not add Message-Authenticator"); 453 return -1; 454 } 455 456 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 457 os_memcpy(msg->hdr->authenticator, req_hdr->authenticator, 16); 458 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 459 wpabuf_len(msg->buf), (u8 *) (attr + 1)); 460 461 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */ 462 addr[0] = wpabuf_head_u8(msg->buf); 463 len[0] = wpabuf_len(msg->buf); 464 addr[1] = secret; 465 len[1] = secret_len; 466 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0) 467 return -1; 468 469 if (wpabuf_len(msg->buf) > 0xffff) { 470 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)", 471 (unsigned long) wpabuf_len(msg->buf)); 472 return -1; 473 } 474 return 0; 475 } 476 477 478 void radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret, 479 size_t secret_len) 480 { 481 const u8 *addr[2]; 482 size_t len[2]; 483 484 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 485 os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN); 486 addr[0] = wpabuf_head(msg->buf); 487 len[0] = wpabuf_len(msg->buf); 488 addr[1] = secret; 489 len[1] = secret_len; 490 md5_vector(2, addr, len, msg->hdr->authenticator); 491 492 if (wpabuf_len(msg->buf) > 0xffff) { 493 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)", 494 (unsigned long) wpabuf_len(msg->buf)); 495 } 496 } 497 498 499 void radius_msg_finish_acct_resp(struct radius_msg *msg, const u8 *secret, 500 size_t secret_len, const u8 *req_authenticator) 501 { 502 const u8 *addr[2]; 503 size_t len[2]; 504 505 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 506 os_memcpy(msg->hdr->authenticator, req_authenticator, MD5_MAC_LEN); 507 addr[0] = wpabuf_head(msg->buf); 508 len[0] = wpabuf_len(msg->buf); 509 addr[1] = secret; 510 len[1] = secret_len; 511 md5_vector(2, addr, len, msg->hdr->authenticator); 512 513 if (wpabuf_len(msg->buf) > 0xffff) { 514 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)", 515 (unsigned long) wpabuf_len(msg->buf)); 516 } 517 } 518 519 520 int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret, 521 size_t secret_len) 522 { 523 const u8 *addr[4]; 524 size_t len[4]; 525 u8 zero[MD5_MAC_LEN]; 526 u8 hash[MD5_MAC_LEN]; 527 528 os_memset(zero, 0, sizeof(zero)); 529 addr[0] = (u8 *) msg->hdr; 530 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN; 531 addr[1] = zero; 532 len[1] = MD5_MAC_LEN; 533 addr[2] = (u8 *) (msg->hdr + 1); 534 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 535 addr[3] = secret; 536 len[3] = secret_len; 537 md5_vector(4, addr, len, hash); 538 return os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0; 539 } 540 541 542 int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret, 543 size_t secret_len, 544 int require_message_authenticator) 545 { 546 const u8 *addr[4]; 547 size_t len[4]; 548 u8 zero[MD5_MAC_LEN]; 549 u8 hash[MD5_MAC_LEN]; 550 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN]; 551 u8 orig_authenticator[16]; 552 553 struct radius_attr_hdr *attr = NULL, *tmp; 554 size_t i; 555 556 os_memset(zero, 0, sizeof(zero)); 557 addr[0] = (u8 *) msg->hdr; 558 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN; 559 addr[1] = zero; 560 len[1] = MD5_MAC_LEN; 561 addr[2] = (u8 *) (msg->hdr + 1); 562 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 563 addr[3] = secret; 564 len[3] = secret_len; 565 md5_vector(4, addr, len, hash); 566 if (os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0) 567 return 1; 568 569 for (i = 0; i < msg->attr_used; i++) { 570 tmp = radius_get_attr_hdr(msg, i); 571 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) { 572 if (attr != NULL) { 573 wpa_printf(MSG_WARNING, "Multiple " 574 "Message-Authenticator attributes " 575 "in RADIUS message"); 576 return 1; 577 } 578 attr = tmp; 579 } 580 } 581 582 if (attr == NULL) { 583 if (require_message_authenticator) { 584 wpa_printf(MSG_WARNING, 585 "Missing Message-Authenticator attribute in RADIUS message"); 586 return 1; 587 } 588 return 0; 589 } 590 591 os_memcpy(orig, attr + 1, MD5_MAC_LEN); 592 os_memset(attr + 1, 0, MD5_MAC_LEN); 593 os_memcpy(orig_authenticator, msg->hdr->authenticator, 594 sizeof(orig_authenticator)); 595 os_memset(msg->hdr->authenticator, 0, 596 sizeof(msg->hdr->authenticator)); 597 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 598 wpabuf_len(msg->buf), auth); 599 os_memcpy(attr + 1, orig, MD5_MAC_LEN); 600 os_memcpy(msg->hdr->authenticator, orig_authenticator, 601 sizeof(orig_authenticator)); 602 603 return os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0; 604 } 605 606 607 static int radius_msg_add_attr_to_array(struct radius_msg *msg, 608 struct radius_attr_hdr *attr) 609 { 610 if (msg->attr_used >= msg->attr_size) { 611 size_t *nattr_pos; 612 int nlen = msg->attr_size * 2; 613 614 nattr_pos = os_realloc_array(msg->attr_pos, nlen, 615 sizeof(*msg->attr_pos)); 616 if (nattr_pos == NULL) 617 return -1; 618 619 msg->attr_pos = nattr_pos; 620 msg->attr_size = nlen; 621 } 622 623 msg->attr_pos[msg->attr_used++] = 624 (unsigned char *) attr - wpabuf_head_u8(msg->buf); 625 626 return 0; 627 } 628 629 630 struct radius_attr_hdr *radius_msg_add_attr(struct radius_msg *msg, u8 type, 631 const u8 *data, size_t data_len) 632 { 633 size_t buf_needed; 634 struct radius_attr_hdr *attr; 635 636 if (TEST_FAIL()) 637 return NULL; 638 639 if (data_len > RADIUS_MAX_ATTR_LEN) { 640 wpa_printf(MSG_ERROR, "radius_msg_add_attr: too long attribute (%lu bytes)", 641 (unsigned long) data_len); 642 return NULL; 643 } 644 645 buf_needed = sizeof(*attr) + data_len; 646 647 if (wpabuf_tailroom(msg->buf) < buf_needed) { 648 /* allocate more space for message buffer */ 649 if (wpabuf_resize(&msg->buf, buf_needed) < 0) 650 return NULL; 651 msg->hdr = wpabuf_mhead(msg->buf); 652 } 653 654 attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr)); 655 attr->type = type; 656 attr->length = sizeof(*attr) + data_len; 657 wpabuf_put_data(msg->buf, data, data_len); 658 659 if (radius_msg_add_attr_to_array(msg, attr)) 660 return NULL; 661 662 return attr; 663 } 664 665 666 /** 667 * radius_msg_parse - Parse a RADIUS message 668 * @data: RADIUS message to be parsed 669 * @len: Length of data buffer in octets 670 * Returns: Parsed RADIUS message or %NULL on failure 671 * 672 * This parses a RADIUS message and makes a copy of its data. The caller is 673 * responsible for freeing the returned data with radius_msg_free(). 674 */ 675 struct radius_msg * radius_msg_parse(const u8 *data, size_t len) 676 { 677 struct radius_msg *msg; 678 struct radius_hdr *hdr; 679 struct radius_attr_hdr *attr; 680 size_t msg_len; 681 unsigned char *pos, *end; 682 683 if (data == NULL || len < sizeof(*hdr)) 684 return NULL; 685 686 hdr = (struct radius_hdr *) data; 687 688 msg_len = be_to_host16(hdr->length); 689 if (msg_len < sizeof(*hdr) || msg_len > len) { 690 wpa_printf(MSG_INFO, "RADIUS: Invalid message length"); 691 return NULL; 692 } 693 694 if (msg_len < len) { 695 wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after " 696 "RADIUS message", (unsigned long) len - msg_len); 697 } 698 699 msg = os_zalloc(sizeof(*msg)); 700 if (msg == NULL) 701 return NULL; 702 703 msg->buf = wpabuf_alloc_copy(data, msg_len); 704 if (msg->buf == NULL || radius_msg_initialize(msg)) { 705 radius_msg_free(msg); 706 return NULL; 707 } 708 msg->hdr = wpabuf_mhead(msg->buf); 709 710 /* parse attributes */ 711 pos = wpabuf_mhead_u8(msg->buf) + sizeof(struct radius_hdr); 712 end = wpabuf_mhead_u8(msg->buf) + wpabuf_len(msg->buf); 713 while (pos < end) { 714 if ((size_t) (end - pos) < sizeof(*attr)) 715 goto fail; 716 717 attr = (struct radius_attr_hdr *) pos; 718 719 if (attr->length > end - pos || attr->length < sizeof(*attr)) 720 goto fail; 721 722 /* TODO: check that attr->length is suitable for attr->type */ 723 724 if (radius_msg_add_attr_to_array(msg, attr)) 725 goto fail; 726 727 pos += attr->length; 728 } 729 730 return msg; 731 732 fail: 733 radius_msg_free(msg); 734 return NULL; 735 } 736 737 738 int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len) 739 { 740 const u8 *pos = data; 741 size_t left = data_len; 742 743 while (left > 0) { 744 int len; 745 if (left > RADIUS_MAX_ATTR_LEN) 746 len = RADIUS_MAX_ATTR_LEN; 747 else 748 len = left; 749 750 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE, 751 pos, len)) 752 return 0; 753 754 pos += len; 755 left -= len; 756 } 757 758 return 1; 759 } 760 761 762 struct wpabuf * radius_msg_get_eap(struct radius_msg *msg) 763 { 764 struct wpabuf *eap; 765 size_t len, i; 766 struct radius_attr_hdr *attr; 767 768 if (msg == NULL) 769 return NULL; 770 771 len = 0; 772 for (i = 0; i < msg->attr_used; i++) { 773 attr = radius_get_attr_hdr(msg, i); 774 if (attr->type == RADIUS_ATTR_EAP_MESSAGE && 775 attr->length > sizeof(struct radius_attr_hdr)) 776 len += attr->length - sizeof(struct radius_attr_hdr); 777 } 778 779 if (len == 0) 780 return NULL; 781 782 eap = wpabuf_alloc(len); 783 if (eap == NULL) 784 return NULL; 785 786 for (i = 0; i < msg->attr_used; i++) { 787 attr = radius_get_attr_hdr(msg, i); 788 if (attr->type == RADIUS_ATTR_EAP_MESSAGE && 789 attr->length > sizeof(struct radius_attr_hdr)) { 790 int flen = attr->length - sizeof(*attr); 791 wpabuf_put_data(eap, attr + 1, flen); 792 } 793 } 794 795 return eap; 796 } 797 798 799 int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret, 800 size_t secret_len, const u8 *req_auth) 801 { 802 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN]; 803 u8 orig_authenticator[16]; 804 struct radius_attr_hdr *attr = NULL, *tmp; 805 size_t i; 806 807 for (i = 0; i < msg->attr_used; i++) { 808 tmp = radius_get_attr_hdr(msg, i); 809 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) { 810 if (attr != NULL) { 811 wpa_printf(MSG_INFO, "Multiple Message-Authenticator attributes in RADIUS message"); 812 return 1; 813 } 814 attr = tmp; 815 } 816 } 817 818 if (attr == NULL) { 819 wpa_printf(MSG_INFO, "No Message-Authenticator attribute found"); 820 return 1; 821 } 822 823 os_memcpy(orig, attr + 1, MD5_MAC_LEN); 824 os_memset(attr + 1, 0, MD5_MAC_LEN); 825 if (req_auth) { 826 os_memcpy(orig_authenticator, msg->hdr->authenticator, 827 sizeof(orig_authenticator)); 828 os_memcpy(msg->hdr->authenticator, req_auth, 829 sizeof(msg->hdr->authenticator)); 830 } 831 if (hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 832 wpabuf_len(msg->buf), auth) < 0) 833 return 1; 834 os_memcpy(attr + 1, orig, MD5_MAC_LEN); 835 if (req_auth) { 836 os_memcpy(msg->hdr->authenticator, orig_authenticator, 837 sizeof(orig_authenticator)); 838 } 839 840 if (os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0) { 841 wpa_printf(MSG_INFO, "Invalid Message-Authenticator!"); 842 return 1; 843 } 844 845 return 0; 846 } 847 848 849 int radius_msg_verify(struct radius_msg *msg, const u8 *secret, 850 size_t secret_len, struct radius_msg *sent_msg, int auth) 851 { 852 const u8 *addr[4]; 853 size_t len[4]; 854 u8 hash[MD5_MAC_LEN]; 855 856 if (sent_msg == NULL) { 857 wpa_printf(MSG_INFO, "No matching Access-Request message found"); 858 return 1; 859 } 860 861 if (auth && 862 radius_msg_verify_msg_auth(msg, secret, secret_len, 863 sent_msg->hdr->authenticator)) { 864 return 1; 865 } 866 867 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */ 868 addr[0] = (u8 *) msg->hdr; 869 len[0] = 1 + 1 + 2; 870 addr[1] = sent_msg->hdr->authenticator; 871 len[1] = MD5_MAC_LEN; 872 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr); 873 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 874 addr[3] = secret; 875 len[3] = secret_len; 876 if (md5_vector(4, addr, len, hash) < 0 || 877 os_memcmp_const(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) { 878 wpa_printf(MSG_INFO, "Response Authenticator invalid!"); 879 return 1; 880 } 881 882 return 0; 883 } 884 885 886 int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src, 887 u8 type) 888 { 889 struct radius_attr_hdr *attr; 890 size_t i; 891 int count = 0; 892 893 for (i = 0; i < src->attr_used; i++) { 894 attr = radius_get_attr_hdr(src, i); 895 if (attr->type == type && attr->length >= sizeof(*attr)) { 896 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1), 897 attr->length - sizeof(*attr))) 898 return -1; 899 count++; 900 } 901 } 902 903 return count; 904 } 905 906 907 /* Create Request Authenticator. The value should be unique over the lifetime 908 * of the shared secret between authenticator and authentication server. 909 */ 910 int radius_msg_make_authenticator(struct radius_msg *msg) 911 { 912 return os_get_random((u8 *) &msg->hdr->authenticator, 913 sizeof(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_memdup(pos + sizeof(*vhdr), len); 969 if (data == NULL) 970 return NULL; 971 if (alen) 972 *alen = len; 973 return data; 974 } 975 } 976 977 return NULL; 978 } 979 980 981 static u8 * decrypt_ms_key(const u8 *key, size_t len, 982 const u8 *req_authenticator, 983 const u8 *secret, size_t secret_len, size_t *reslen) 984 { 985 u8 *plain, *ppos, *res; 986 const u8 *pos; 987 size_t left, plen; 988 u8 hash[MD5_MAC_LEN]; 989 int i, first = 1; 990 const u8 *addr[3]; 991 size_t elen[3]; 992 993 /* key: 16-bit salt followed by encrypted key info */ 994 995 if (len < 2 + 16) { 996 wpa_printf(MSG_DEBUG, "RADIUS: %s: Len is too small: %d", 997 __func__, (int) len); 998 return NULL; 999 } 1000 1001 pos = key + 2; 1002 left = len - 2; 1003 if (left % 16) { 1004 wpa_printf(MSG_INFO, "RADIUS: Invalid ms key len %lu", 1005 (unsigned long) left); 1006 return NULL; 1007 } 1008 1009 plen = left; 1010 ppos = plain = os_malloc(plen); 1011 if (plain == NULL) 1012 return NULL; 1013 plain[0] = 0; 1014 1015 while (left > 0) { 1016 /* b(1) = MD5(Secret + Request-Authenticator + Salt) 1017 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */ 1018 1019 addr[0] = secret; 1020 elen[0] = secret_len; 1021 if (first) { 1022 addr[1] = req_authenticator; 1023 elen[1] = MD5_MAC_LEN; 1024 addr[2] = key; 1025 elen[2] = 2; /* Salt */ 1026 } else { 1027 addr[1] = pos - MD5_MAC_LEN; 1028 elen[1] = MD5_MAC_LEN; 1029 } 1030 if (md5_vector(first ? 3 : 2, addr, elen, hash) < 0) { 1031 os_free(plain); 1032 return NULL; 1033 } 1034 first = 0; 1035 1036 for (i = 0; i < MD5_MAC_LEN; i++) 1037 *ppos++ = *pos++ ^ hash[i]; 1038 left -= MD5_MAC_LEN; 1039 } 1040 1041 if (plain[0] == 0 || plain[0] > plen - 1) { 1042 wpa_printf(MSG_INFO, "RADIUS: Failed to decrypt MPPE key"); 1043 os_free(plain); 1044 return NULL; 1045 } 1046 1047 res = os_memdup(plain + 1, plain[0]); 1048 if (res == NULL) { 1049 os_free(plain); 1050 return NULL; 1051 } 1052 if (reslen) 1053 *reslen = plain[0]; 1054 os_free(plain); 1055 return res; 1056 } 1057 1058 1059 static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt, 1060 const u8 *req_authenticator, 1061 const u8 *secret, size_t secret_len, 1062 u8 *ebuf, size_t *elen) 1063 { 1064 int i, len, first = 1; 1065 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos; 1066 const u8 *addr[3]; 1067 size_t _len[3]; 1068 1069 WPA_PUT_BE16(saltbuf, salt); 1070 1071 len = 1 + key_len; 1072 if (len & 0x0f) { 1073 len = (len & 0xf0) + 16; 1074 } 1075 os_memset(ebuf, 0, len); 1076 ebuf[0] = key_len; 1077 os_memcpy(ebuf + 1, key, key_len); 1078 1079 *elen = len; 1080 1081 pos = ebuf; 1082 while (len > 0) { 1083 /* b(1) = MD5(Secret + Request-Authenticator + Salt) 1084 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */ 1085 addr[0] = secret; 1086 _len[0] = secret_len; 1087 if (first) { 1088 addr[1] = req_authenticator; 1089 _len[1] = MD5_MAC_LEN; 1090 addr[2] = saltbuf; 1091 _len[2] = sizeof(saltbuf); 1092 } else { 1093 addr[1] = pos - MD5_MAC_LEN; 1094 _len[1] = MD5_MAC_LEN; 1095 } 1096 md5_vector(first ? 3 : 2, addr, _len, hash); 1097 first = 0; 1098 1099 for (i = 0; i < MD5_MAC_LEN; i++) 1100 *pos++ ^= hash[i]; 1101 1102 len -= MD5_MAC_LEN; 1103 } 1104 } 1105 1106 1107 struct radius_ms_mppe_keys * 1108 radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg, 1109 const u8 *secret, size_t secret_len) 1110 { 1111 u8 *key; 1112 size_t keylen; 1113 struct radius_ms_mppe_keys *keys; 1114 1115 if (msg == NULL || sent_msg == NULL) 1116 return NULL; 1117 1118 keys = os_zalloc(sizeof(*keys)); 1119 if (keys == NULL) 1120 return NULL; 1121 1122 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT, 1123 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY, 1124 &keylen); 1125 if (key) { 1126 keys->send = decrypt_ms_key(key, keylen, 1127 sent_msg->hdr->authenticator, 1128 secret, secret_len, 1129 &keys->send_len); 1130 if (!keys->send) { 1131 wpa_printf(MSG_DEBUG, 1132 "RADIUS: Failed to decrypt send key"); 1133 } 1134 os_free(key); 1135 } 1136 1137 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT, 1138 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY, 1139 &keylen); 1140 if (key) { 1141 keys->recv = decrypt_ms_key(key, keylen, 1142 sent_msg->hdr->authenticator, 1143 secret, secret_len, 1144 &keys->recv_len); 1145 if (!keys->recv) { 1146 wpa_printf(MSG_DEBUG, 1147 "RADIUS: Failed to decrypt recv key"); 1148 } 1149 os_free(key); 1150 } 1151 1152 return keys; 1153 } 1154 1155 1156 struct radius_ms_mppe_keys * 1157 radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg, 1158 const u8 *secret, size_t secret_len) 1159 { 1160 u8 *key; 1161 size_t keylen; 1162 struct radius_ms_mppe_keys *keys; 1163 1164 if (msg == NULL || sent_msg == NULL) 1165 return NULL; 1166 1167 keys = os_zalloc(sizeof(*keys)); 1168 if (keys == NULL) 1169 return NULL; 1170 1171 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO, 1172 RADIUS_CISCO_AV_PAIR, &keylen); 1173 if (key && keylen == 51 && 1174 os_memcmp(key, "leap:session-key=", 17) == 0) { 1175 keys->recv = decrypt_ms_key(key + 17, keylen - 17, 1176 sent_msg->hdr->authenticator, 1177 secret, secret_len, 1178 &keys->recv_len); 1179 } 1180 os_free(key); 1181 1182 return keys; 1183 } 1184 1185 1186 int radius_msg_add_mppe_keys(struct radius_msg *msg, 1187 const u8 *req_authenticator, 1188 const u8 *secret, size_t secret_len, 1189 const u8 *send_key, size_t send_key_len, 1190 const u8 *recv_key, size_t recv_key_len) 1191 { 1192 struct radius_attr_hdr *attr; 1193 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT); 1194 u8 *buf; 1195 struct radius_attr_vendor *vhdr; 1196 u8 *pos; 1197 size_t elen; 1198 int hlen; 1199 u16 salt; 1200 1201 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2; 1202 1203 /* MS-MPPE-Send-Key */ 1204 buf = os_malloc(hlen + send_key_len + 16); 1205 if (buf == NULL) { 1206 return 0; 1207 } 1208 pos = buf; 1209 os_memcpy(pos, &vendor_id, sizeof(vendor_id)); 1210 pos += sizeof(vendor_id); 1211 vhdr = (struct radius_attr_vendor *) pos; 1212 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY; 1213 pos = (u8 *) (vhdr + 1); 1214 if (os_get_random((u8 *) &salt, sizeof(salt)) < 0) { 1215 os_free(buf); 1216 return 0; 1217 } 1218 salt |= 0x8000; 1219 WPA_PUT_BE16(pos, salt); 1220 pos += 2; 1221 encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret, 1222 secret_len, pos, &elen); 1223 vhdr->vendor_length = hlen + elen - sizeof(vendor_id); 1224 1225 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC, 1226 buf, hlen + elen); 1227 os_free(buf); 1228 if (attr == NULL) { 1229 return 0; 1230 } 1231 1232 /* MS-MPPE-Recv-Key */ 1233 buf = os_malloc(hlen + recv_key_len + 16); 1234 if (buf == NULL) { 1235 return 0; 1236 } 1237 pos = buf; 1238 os_memcpy(pos, &vendor_id, sizeof(vendor_id)); 1239 pos += sizeof(vendor_id); 1240 vhdr = (struct radius_attr_vendor *) pos; 1241 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY; 1242 pos = (u8 *) (vhdr + 1); 1243 salt ^= 1; 1244 WPA_PUT_BE16(pos, salt); 1245 pos += 2; 1246 encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret, 1247 secret_len, pos, &elen); 1248 vhdr->vendor_length = hlen + elen - sizeof(vendor_id); 1249 1250 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC, 1251 buf, hlen + elen); 1252 os_free(buf); 1253 if (attr == NULL) { 1254 return 0; 1255 } 1256 1257 return 1; 1258 } 1259 1260 1261 int radius_msg_add_wfa(struct radius_msg *msg, u8 subtype, const u8 *data, 1262 size_t len) 1263 { 1264 struct radius_attr_hdr *attr; 1265 u8 *buf, *pos; 1266 size_t alen; 1267 1268 alen = 4 + 2 + len; 1269 buf = os_malloc(alen); 1270 if (buf == NULL) 1271 return 0; 1272 pos = buf; 1273 WPA_PUT_BE32(pos, RADIUS_VENDOR_ID_WFA); 1274 pos += 4; 1275 *pos++ = subtype; 1276 *pos++ = 2 + len; 1277 os_memcpy(pos, data, len); 1278 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC, 1279 buf, alen); 1280 os_free(buf); 1281 if (attr == NULL) 1282 return 0; 1283 1284 return 1; 1285 } 1286 1287 1288 int radius_user_password_hide(struct radius_msg *msg, 1289 const u8 *data, size_t data_len, 1290 const u8 *secret, size_t secret_len, 1291 u8 *buf, size_t buf_len) 1292 { 1293 size_t padlen, i, pos; 1294 const u8 *addr[2]; 1295 size_t len[2]; 1296 u8 hash[16]; 1297 1298 if (data_len + 16 > buf_len) 1299 return -1; 1300 1301 os_memcpy(buf, data, data_len); 1302 1303 padlen = data_len % 16; 1304 if (padlen && data_len < buf_len) { 1305 padlen = 16 - padlen; 1306 os_memset(buf + data_len, 0, padlen); 1307 buf_len = data_len + padlen; 1308 } else { 1309 buf_len = data_len; 1310 } 1311 1312 addr[0] = secret; 1313 len[0] = secret_len; 1314 addr[1] = msg->hdr->authenticator; 1315 len[1] = 16; 1316 md5_vector(2, addr, len, hash); 1317 1318 for (i = 0; i < 16; i++) 1319 buf[i] ^= hash[i]; 1320 pos = 16; 1321 1322 while (pos < buf_len) { 1323 addr[0] = secret; 1324 len[0] = secret_len; 1325 addr[1] = &buf[pos - 16]; 1326 len[1] = 16; 1327 md5_vector(2, addr, len, hash); 1328 1329 for (i = 0; i < 16; i++) 1330 buf[pos + i] ^= hash[i]; 1331 1332 pos += 16; 1333 } 1334 1335 return buf_len; 1336 } 1337 1338 1339 /* Add User-Password attribute to a RADIUS message and encrypt it as specified 1340 * in RFC 2865, Chap. 5.2 */ 1341 struct radius_attr_hdr * 1342 radius_msg_add_attr_user_password(struct radius_msg *msg, 1343 const u8 *data, size_t data_len, 1344 const u8 *secret, size_t secret_len) 1345 { 1346 u8 buf[128]; 1347 int res; 1348 1349 res = radius_user_password_hide(msg, data, data_len, 1350 secret, secret_len, buf, sizeof(buf)); 1351 if (res < 0) 1352 return NULL; 1353 1354 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD, 1355 buf, res); 1356 } 1357 1358 1359 int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len) 1360 { 1361 struct radius_attr_hdr *attr = NULL, *tmp; 1362 size_t i, dlen; 1363 1364 for (i = 0; i < msg->attr_used; i++) { 1365 tmp = radius_get_attr_hdr(msg, i); 1366 if (tmp->type == type) { 1367 attr = tmp; 1368 break; 1369 } 1370 } 1371 1372 if (!attr || attr->length < sizeof(*attr)) 1373 return -1; 1374 1375 dlen = attr->length - sizeof(*attr); 1376 if (buf) 1377 os_memcpy(buf, (attr + 1), dlen > len ? len : dlen); 1378 return dlen; 1379 } 1380 1381 1382 int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf, 1383 size_t *len, const u8 *start) 1384 { 1385 size_t i; 1386 struct radius_attr_hdr *attr = NULL, *tmp; 1387 1388 for (i = 0; i < msg->attr_used; i++) { 1389 tmp = radius_get_attr_hdr(msg, i); 1390 if (tmp->type == type && 1391 (start == NULL || (u8 *) tmp > start)) { 1392 attr = tmp; 1393 break; 1394 } 1395 } 1396 1397 if (!attr || attr->length < sizeof(*attr)) 1398 return -1; 1399 1400 *buf = (u8 *) (attr + 1); 1401 *len = attr->length - sizeof(*attr); 1402 return 0; 1403 } 1404 1405 1406 int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len) 1407 { 1408 size_t i; 1409 int count; 1410 1411 for (count = 0, i = 0; i < msg->attr_used; i++) { 1412 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i); 1413 if (attr->type == type && 1414 attr->length >= sizeof(struct radius_attr_hdr) + min_len) 1415 count++; 1416 } 1417 1418 return count; 1419 } 1420 1421 1422 struct radius_tunnel_attrs { 1423 int tag_used; 1424 int type; /* Tunnel-Type */ 1425 int medium_type; /* Tunnel-Medium-Type */ 1426 int vlanid; 1427 }; 1428 1429 1430 static int cmp_int(const void *a, const void *b) 1431 { 1432 int x, y; 1433 1434 x = *((int *) a); 1435 y = *((int *) b); 1436 return (x - y); 1437 } 1438 1439 1440 /** 1441 * radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information 1442 * The k tagged vlans found are sorted by vlan_id and stored in the first k 1443 * items of tagged. 1444 * 1445 * @msg: RADIUS message 1446 * @untagged: Pointer to store untagged vid 1447 * @numtagged: Size of tagged 1448 * @tagged: Pointer to store tagged list 1449 * 1450 * Returns: 0 if neither tagged nor untagged configuration is found, 1 otherwise 1451 */ 1452 int radius_msg_get_vlanid(struct radius_msg *msg, int *untagged, int numtagged, 1453 int *tagged) 1454 { 1455 struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun; 1456 size_t i; 1457 struct radius_attr_hdr *attr = NULL; 1458 const u8 *data; 1459 char buf[10]; 1460 size_t dlen; 1461 int j, taggedidx = 0, vlan_id; 1462 1463 os_memset(&tunnel, 0, sizeof(tunnel)); 1464 for (j = 0; j < numtagged; j++) 1465 tagged[j] = 0; 1466 *untagged = 0; 1467 1468 for (i = 0; i < msg->attr_used; i++) { 1469 attr = radius_get_attr_hdr(msg, i); 1470 if (attr->length < sizeof(*attr)) 1471 return -1; 1472 data = (const u8 *) (attr + 1); 1473 dlen = attr->length - sizeof(*attr); 1474 if (attr->length < 3) 1475 continue; 1476 if (data[0] >= RADIUS_TUNNEL_TAGS) 1477 tun = &tunnel[0]; 1478 else 1479 tun = &tunnel[data[0]]; 1480 1481 switch (attr->type) { 1482 case RADIUS_ATTR_TUNNEL_TYPE: 1483 if (attr->length != 6) 1484 break; 1485 tun->tag_used++; 1486 tun->type = WPA_GET_BE24(data + 1); 1487 break; 1488 case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE: 1489 if (attr->length != 6) 1490 break; 1491 tun->tag_used++; 1492 tun->medium_type = WPA_GET_BE24(data + 1); 1493 break; 1494 case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID: 1495 if (data[0] < RADIUS_TUNNEL_TAGS) { 1496 data++; 1497 dlen--; 1498 } 1499 if (dlen >= sizeof(buf)) 1500 break; 1501 os_memcpy(buf, data, dlen); 1502 buf[dlen] = '\0'; 1503 vlan_id = atoi(buf); 1504 if (vlan_id <= 0) 1505 break; 1506 tun->tag_used++; 1507 tun->vlanid = vlan_id; 1508 break; 1509 case RADIUS_ATTR_EGRESS_VLANID: /* RFC 4675 */ 1510 if (attr->length != 6) 1511 break; 1512 vlan_id = WPA_GET_BE24(data + 1); 1513 if (vlan_id <= 0) 1514 break; 1515 if (data[0] == 0x32) 1516 *untagged = vlan_id; 1517 else if (data[0] == 0x31 && tagged && 1518 taggedidx < numtagged) 1519 tagged[taggedidx++] = vlan_id; 1520 break; 1521 } 1522 } 1523 1524 /* Use tunnel with the lowest tag for untagged VLAN id */ 1525 for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) { 1526 tun = &tunnel[i]; 1527 if (tun->tag_used && 1528 tun->type == RADIUS_TUNNEL_TYPE_VLAN && 1529 tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 && 1530 tun->vlanid > 0) { 1531 *untagged = tun->vlanid; 1532 break; 1533 } 1534 } 1535 1536 if (taggedidx) 1537 qsort(tagged, taggedidx, sizeof(int), cmp_int); 1538 1539 if (*untagged > 0 || taggedidx) 1540 return 1; 1541 return 0; 1542 } 1543 1544 1545 /** 1546 * radius_msg_get_tunnel_password - Parse RADIUS attribute Tunnel-Password 1547 * @msg: Received RADIUS message 1548 * @keylen: Length of returned password 1549 * @secret: RADIUS shared secret 1550 * @secret_len: Length of secret 1551 * @sent_msg: Sent RADIUS message 1552 * @n: Number of password attribute to return (starting with 0) 1553 * Returns: Pointer to n-th password (free with os_free) or %NULL 1554 */ 1555 char * radius_msg_get_tunnel_password(struct radius_msg *msg, int *keylen, 1556 const u8 *secret, size_t secret_len, 1557 struct radius_msg *sent_msg, size_t n) 1558 { 1559 u8 *buf = NULL; 1560 size_t buflen; 1561 const u8 *salt; 1562 u8 *str; 1563 const u8 *addr[3]; 1564 size_t len[3]; 1565 u8 hash[16]; 1566 u8 *pos; 1567 size_t i, j = 0; 1568 struct radius_attr_hdr *attr; 1569 const u8 *data; 1570 size_t dlen; 1571 const u8 *fdata = NULL; /* points to found item */ 1572 size_t fdlen = -1; 1573 char *ret = NULL; 1574 1575 /* find n-th valid Tunnel-Password attribute */ 1576 for (i = 0; i < msg->attr_used; i++) { 1577 attr = radius_get_attr_hdr(msg, i); 1578 if (attr == NULL || 1579 attr->type != RADIUS_ATTR_TUNNEL_PASSWORD) { 1580 continue; 1581 } 1582 if (attr->length <= 5) 1583 continue; 1584 data = (const u8 *) (attr + 1); 1585 dlen = attr->length - sizeof(*attr); 1586 if (dlen <= 3 || dlen % 16 != 3) 1587 continue; 1588 j++; 1589 if (j <= n) 1590 continue; 1591 1592 fdata = data; 1593 fdlen = dlen; 1594 break; 1595 } 1596 if (fdata == NULL) 1597 goto out; 1598 1599 /* alloc writable memory for decryption */ 1600 buf = os_memdup(fdata, fdlen); 1601 if (buf == NULL) 1602 goto out; 1603 buflen = fdlen; 1604 1605 /* init pointers */ 1606 salt = buf + 1; 1607 str = buf + 3; 1608 1609 /* decrypt blocks */ 1610 pos = buf + buflen - 16; /* last block */ 1611 while (pos >= str + 16) { /* all but the first block */ 1612 addr[0] = secret; 1613 len[0] = secret_len; 1614 addr[1] = pos - 16; 1615 len[1] = 16; 1616 md5_vector(2, addr, len, hash); 1617 1618 for (i = 0; i < 16; i++) 1619 pos[i] ^= hash[i]; 1620 1621 pos -= 16; 1622 } 1623 1624 /* decrypt first block */ 1625 if (str != pos) 1626 goto out; 1627 addr[0] = secret; 1628 len[0] = secret_len; 1629 addr[1] = sent_msg->hdr->authenticator; 1630 len[1] = 16; 1631 addr[2] = salt; 1632 len[2] = 2; 1633 md5_vector(3, addr, len, hash); 1634 1635 for (i = 0; i < 16; i++) 1636 pos[i] ^= hash[i]; 1637 1638 /* derive plaintext length from first subfield */ 1639 *keylen = (unsigned char) str[0]; 1640 if ((u8 *) (str + *keylen) >= (u8 *) (buf + buflen)) { 1641 /* decryption error - invalid key length */ 1642 goto out; 1643 } 1644 if (*keylen == 0) { 1645 /* empty password */ 1646 goto out; 1647 } 1648 1649 /* copy passphrase into new buffer */ 1650 ret = os_malloc(*keylen); 1651 if (ret) 1652 os_memcpy(ret, str + 1, *keylen); 1653 1654 out: 1655 /* return new buffer */ 1656 os_free(buf); 1657 return ret; 1658 } 1659 1660 1661 void radius_free_class(struct radius_class_data *c) 1662 { 1663 size_t i; 1664 if (c == NULL) 1665 return; 1666 for (i = 0; i < c->count; i++) 1667 os_free(c->attr[i].data); 1668 os_free(c->attr); 1669 c->attr = NULL; 1670 c->count = 0; 1671 } 1672 1673 1674 int radius_copy_class(struct radius_class_data *dst, 1675 const struct radius_class_data *src) 1676 { 1677 size_t i; 1678 1679 if (src->attr == NULL) 1680 return 0; 1681 1682 dst->attr = os_calloc(src->count, sizeof(struct radius_attr_data)); 1683 if (dst->attr == NULL) 1684 return -1; 1685 1686 dst->count = 0; 1687 1688 for (i = 0; i < src->count; i++) { 1689 dst->attr[i].data = os_memdup(src->attr[i].data, 1690 src->attr[i].len); 1691 if (dst->attr[i].data == NULL) 1692 break; 1693 dst->count++; 1694 dst->attr[i].len = src->attr[i].len; 1695 } 1696 1697 return 0; 1698 } 1699 1700 1701 u8 radius_msg_find_unlisted_attr(struct radius_msg *msg, u8 *attrs) 1702 { 1703 size_t i, j; 1704 struct radius_attr_hdr *attr; 1705 1706 for (i = 0; i < msg->attr_used; i++) { 1707 attr = radius_get_attr_hdr(msg, i); 1708 1709 for (j = 0; attrs[j]; j++) { 1710 if (attr->type == attrs[j]) 1711 break; 1712 } 1713 1714 if (attrs[j] == 0) 1715 return attr->type; /* unlisted attr */ 1716 } 1717 1718 return 0; 1719 } 1720 1721 1722 int radius_gen_session_id(u8 *id, size_t len) 1723 { 1724 /* 1725 * Acct-Session-Id and Acct-Multi-Session-Id should be globally and 1726 * temporarily unique. A high quality random number is required 1727 * therefore. This could be be improved by switching to a GUID. 1728 */ 1729 return os_get_random(id, len); 1730 } 1731
