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_PAIRWISE_CIPHER, "WLAN-Pairwise-Cipher", 254 RADIUS_ATTR_HEXDUMP }, 255 { RADIUS_ATTR_WLAN_GROUP_CIPHER, "WLAN-Group-Cipher", 256 RADIUS_ATTR_HEXDUMP }, 257 { RADIUS_ATTR_WLAN_AKM_SUITE, "WLAN-AKM-Suite", 258 RADIUS_ATTR_HEXDUMP }, 259 { RADIUS_ATTR_WLAN_GROUP_MGMT_CIPHER, "WLAN-Group-Mgmt-Pairwise-Cipher", 260 RADIUS_ATTR_HEXDUMP }, 261 }; 262 #define RADIUS_ATTRS ARRAY_SIZE(radius_attrs) 263 264 265 static const struct radius_attr_type *radius_get_attr_type(u8 type) 266 { 267 size_t i; 268 269 for (i = 0; i < RADIUS_ATTRS; i++) { 270 if (type == radius_attrs[i].type) 271 return &radius_attrs[i]; 272 } 273 274 return NULL; 275 } 276 277 278 static void radius_msg_dump_attr(struct radius_attr_hdr *hdr) 279 { 280 const struct radius_attr_type *attr; 281 int len; 282 unsigned char *pos; 283 char buf[1000]; 284 285 attr = radius_get_attr_type(hdr->type); 286 287 wpa_printf(MSG_INFO, " Attribute %d (%s) length=%d", 288 hdr->type, attr ? attr->name : "?Unknown?", hdr->length); 289 290 if (attr == NULL || hdr->length < sizeof(struct radius_attr_hdr)) 291 return; 292 293 len = hdr->length - sizeof(struct radius_attr_hdr); 294 pos = (unsigned char *) (hdr + 1); 295 296 switch (attr->data_type) { 297 case RADIUS_ATTR_TEXT: 298 printf_encode(buf, sizeof(buf), pos, len); 299 wpa_printf(MSG_INFO, " Value: '%s'", buf); 300 break; 301 302 case RADIUS_ATTR_IP: 303 if (len == 4) { 304 struct in_addr addr; 305 os_memcpy(&addr, pos, 4); 306 wpa_printf(MSG_INFO, " Value: %s", 307 inet_ntoa(addr)); 308 } else { 309 wpa_printf(MSG_INFO, " Invalid IP address length %d", 310 len); 311 } 312 break; 313 314 #ifdef CONFIG_IPV6 315 case RADIUS_ATTR_IPV6: 316 if (len == 16) { 317 const char *atxt; 318 struct in6_addr *addr = (struct in6_addr *) pos; 319 atxt = inet_ntop(AF_INET6, addr, buf, sizeof(buf)); 320 wpa_printf(MSG_INFO, " Value: %s", 321 atxt ? atxt : "?"); 322 } else { 323 wpa_printf(MSG_INFO, " Invalid IPv6 address length %d", 324 len); 325 } 326 break; 327 #endif /* CONFIG_IPV6 */ 328 329 case RADIUS_ATTR_HEXDUMP: 330 case RADIUS_ATTR_UNDIST: 331 wpa_snprintf_hex(buf, sizeof(buf), pos, len); 332 wpa_printf(MSG_INFO, " Value: %s", buf); 333 break; 334 335 case RADIUS_ATTR_INT32: 336 if (len == 4) 337 wpa_printf(MSG_INFO, " Value: %u", 338 WPA_GET_BE32(pos)); 339 else 340 wpa_printf(MSG_INFO, " Invalid INT32 length %d", 341 len); 342 break; 343 344 default: 345 break; 346 } 347 } 348 349 350 void radius_msg_dump(struct radius_msg *msg) 351 { 352 size_t i; 353 354 wpa_printf(MSG_INFO, "RADIUS message: code=%d (%s) identifier=%d length=%d", 355 msg->hdr->code, radius_code_string(msg->hdr->code), 356 msg->hdr->identifier, be_to_host16(msg->hdr->length)); 357 358 for (i = 0; i < msg->attr_used; i++) { 359 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i); 360 radius_msg_dump_attr(attr); 361 } 362 } 363 364 365 int radius_msg_finish(struct radius_msg *msg, const u8 *secret, 366 size_t secret_len) 367 { 368 if (secret) { 369 u8 auth[MD5_MAC_LEN]; 370 struct radius_attr_hdr *attr; 371 372 os_memset(auth, 0, MD5_MAC_LEN); 373 attr = radius_msg_add_attr(msg, 374 RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 375 auth, MD5_MAC_LEN); 376 if (attr == NULL) { 377 wpa_printf(MSG_WARNING, "RADIUS: Could not add " 378 "Message-Authenticator"); 379 return -1; 380 } 381 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 382 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 383 wpabuf_len(msg->buf), (u8 *) (attr + 1)); 384 } else 385 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 386 387 if (wpabuf_len(msg->buf) > 0xffff) { 388 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)", 389 (unsigned long) wpabuf_len(msg->buf)); 390 return -1; 391 } 392 return 0; 393 } 394 395 396 int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret, 397 size_t secret_len, const u8 *req_authenticator) 398 { 399 u8 auth[MD5_MAC_LEN]; 400 struct radius_attr_hdr *attr; 401 const u8 *addr[4]; 402 size_t len[4]; 403 404 os_memset(auth, 0, MD5_MAC_LEN); 405 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 406 auth, MD5_MAC_LEN); 407 if (attr == NULL) { 408 wpa_printf(MSG_ERROR, "WARNING: Could not add Message-Authenticator"); 409 return -1; 410 } 411 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 412 os_memcpy(msg->hdr->authenticator, req_authenticator, 413 sizeof(msg->hdr->authenticator)); 414 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 415 wpabuf_len(msg->buf), (u8 *) (attr + 1)); 416 417 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */ 418 addr[0] = (u8 *) msg->hdr; 419 len[0] = 1 + 1 + 2; 420 addr[1] = req_authenticator; 421 len[1] = MD5_MAC_LEN; 422 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr); 423 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 424 addr[3] = secret; 425 len[3] = secret_len; 426 md5_vector(4, addr, len, msg->hdr->authenticator); 427 428 if (wpabuf_len(msg->buf) > 0xffff) { 429 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)", 430 (unsigned long) wpabuf_len(msg->buf)); 431 return -1; 432 } 433 return 0; 434 } 435 436 437 int radius_msg_finish_das_resp(struct radius_msg *msg, const u8 *secret, 438 size_t secret_len, 439 const struct radius_hdr *req_hdr) 440 { 441 const u8 *addr[2]; 442 size_t len[2]; 443 u8 auth[MD5_MAC_LEN]; 444 struct radius_attr_hdr *attr; 445 446 os_memset(auth, 0, MD5_MAC_LEN); 447 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 448 auth, MD5_MAC_LEN); 449 if (attr == NULL) { 450 wpa_printf(MSG_WARNING, "Could not add Message-Authenticator"); 451 return -1; 452 } 453 454 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 455 os_memcpy(msg->hdr->authenticator, req_hdr->authenticator, 16); 456 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 457 wpabuf_len(msg->buf), (u8 *) (attr + 1)); 458 459 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */ 460 addr[0] = wpabuf_head_u8(msg->buf); 461 len[0] = wpabuf_len(msg->buf); 462 addr[1] = secret; 463 len[1] = secret_len; 464 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0) 465 return -1; 466 467 if (wpabuf_len(msg->buf) > 0xffff) { 468 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)", 469 (unsigned long) wpabuf_len(msg->buf)); 470 return -1; 471 } 472 return 0; 473 } 474 475 476 void radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret, 477 size_t secret_len) 478 { 479 const u8 *addr[2]; 480 size_t len[2]; 481 482 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 483 os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN); 484 addr[0] = wpabuf_head(msg->buf); 485 len[0] = wpabuf_len(msg->buf); 486 addr[1] = secret; 487 len[1] = secret_len; 488 md5_vector(2, addr, len, msg->hdr->authenticator); 489 490 if (wpabuf_len(msg->buf) > 0xffff) { 491 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)", 492 (unsigned long) wpabuf_len(msg->buf)); 493 } 494 } 495 496 497 void radius_msg_finish_acct_resp(struct radius_msg *msg, const u8 *secret, 498 size_t secret_len, const u8 *req_authenticator) 499 { 500 const u8 *addr[2]; 501 size_t len[2]; 502 503 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 504 os_memcpy(msg->hdr->authenticator, req_authenticator, MD5_MAC_LEN); 505 addr[0] = wpabuf_head(msg->buf); 506 len[0] = wpabuf_len(msg->buf); 507 addr[1] = secret; 508 len[1] = secret_len; 509 md5_vector(2, addr, len, msg->hdr->authenticator); 510 511 if (wpabuf_len(msg->buf) > 0xffff) { 512 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)", 513 (unsigned long) wpabuf_len(msg->buf)); 514 } 515 } 516 517 518 int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret, 519 size_t secret_len) 520 { 521 const u8 *addr[4]; 522 size_t len[4]; 523 u8 zero[MD5_MAC_LEN]; 524 u8 hash[MD5_MAC_LEN]; 525 526 os_memset(zero, 0, sizeof(zero)); 527 addr[0] = (u8 *) msg->hdr; 528 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN; 529 addr[1] = zero; 530 len[1] = MD5_MAC_LEN; 531 addr[2] = (u8 *) (msg->hdr + 1); 532 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 533 addr[3] = secret; 534 len[3] = secret_len; 535 md5_vector(4, addr, len, hash); 536 return os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0; 537 } 538 539 540 int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret, 541 size_t secret_len) 542 { 543 const u8 *addr[4]; 544 size_t len[4]; 545 u8 zero[MD5_MAC_LEN]; 546 u8 hash[MD5_MAC_LEN]; 547 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN]; 548 u8 orig_authenticator[16]; 549 550 struct radius_attr_hdr *attr = NULL, *tmp; 551 size_t i; 552 553 os_memset(zero, 0, sizeof(zero)); 554 addr[0] = (u8 *) msg->hdr; 555 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN; 556 addr[1] = zero; 557 len[1] = MD5_MAC_LEN; 558 addr[2] = (u8 *) (msg->hdr + 1); 559 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 560 addr[3] = secret; 561 len[3] = secret_len; 562 md5_vector(4, addr, len, hash); 563 if (os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0) 564 return 1; 565 566 for (i = 0; i < msg->attr_used; i++) { 567 tmp = radius_get_attr_hdr(msg, i); 568 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) { 569 if (attr != NULL) { 570 wpa_printf(MSG_WARNING, "Multiple " 571 "Message-Authenticator attributes " 572 "in RADIUS message"); 573 return 1; 574 } 575 attr = tmp; 576 } 577 } 578 579 if (attr == NULL) { 580 /* Message-Authenticator is MAY; not required */ 581 return 0; 582 } 583 584 os_memcpy(orig, attr + 1, MD5_MAC_LEN); 585 os_memset(attr + 1, 0, MD5_MAC_LEN); 586 os_memcpy(orig_authenticator, msg->hdr->authenticator, 587 sizeof(orig_authenticator)); 588 os_memset(msg->hdr->authenticator, 0, 589 sizeof(msg->hdr->authenticator)); 590 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 591 wpabuf_len(msg->buf), auth); 592 os_memcpy(attr + 1, orig, MD5_MAC_LEN); 593 os_memcpy(msg->hdr->authenticator, orig_authenticator, 594 sizeof(orig_authenticator)); 595 596 return os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0; 597 } 598 599 600 static int radius_msg_add_attr_to_array(struct radius_msg *msg, 601 struct radius_attr_hdr *attr) 602 { 603 if (msg->attr_used >= msg->attr_size) { 604 size_t *nattr_pos; 605 int nlen = msg->attr_size * 2; 606 607 nattr_pos = os_realloc_array(msg->attr_pos, nlen, 608 sizeof(*msg->attr_pos)); 609 if (nattr_pos == NULL) 610 return -1; 611 612 msg->attr_pos = nattr_pos; 613 msg->attr_size = nlen; 614 } 615 616 msg->attr_pos[msg->attr_used++] = 617 (unsigned char *) attr - wpabuf_head_u8(msg->buf); 618 619 return 0; 620 } 621 622 623 struct radius_attr_hdr *radius_msg_add_attr(struct radius_msg *msg, u8 type, 624 const u8 *data, size_t data_len) 625 { 626 size_t buf_needed; 627 struct radius_attr_hdr *attr; 628 629 if (data_len > RADIUS_MAX_ATTR_LEN) { 630 wpa_printf(MSG_ERROR, "radius_msg_add_attr: too long attribute (%lu bytes)", 631 (unsigned long) data_len); 632 return NULL; 633 } 634 635 buf_needed = sizeof(*attr) + data_len; 636 637 if (wpabuf_tailroom(msg->buf) < buf_needed) { 638 /* allocate more space for message buffer */ 639 if (wpabuf_resize(&msg->buf, buf_needed) < 0) 640 return NULL; 641 msg->hdr = wpabuf_mhead(msg->buf); 642 } 643 644 attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr)); 645 attr->type = type; 646 attr->length = sizeof(*attr) + data_len; 647 wpabuf_put_data(msg->buf, data, data_len); 648 649 if (radius_msg_add_attr_to_array(msg, attr)) 650 return NULL; 651 652 return attr; 653 } 654 655 656 /** 657 * radius_msg_parse - Parse a RADIUS message 658 * @data: RADIUS message to be parsed 659 * @len: Length of data buffer in octets 660 * Returns: Parsed RADIUS message or %NULL on failure 661 * 662 * This parses a RADIUS message and makes a copy of its data. The caller is 663 * responsible for freeing the returned data with radius_msg_free(). 664 */ 665 struct radius_msg * radius_msg_parse(const u8 *data, size_t len) 666 { 667 struct radius_msg *msg; 668 struct radius_hdr *hdr; 669 struct radius_attr_hdr *attr; 670 size_t msg_len; 671 unsigned char *pos, *end; 672 673 if (data == NULL || len < sizeof(*hdr)) 674 return NULL; 675 676 hdr = (struct radius_hdr *) data; 677 678 msg_len = be_to_host16(hdr->length); 679 if (msg_len < sizeof(*hdr) || msg_len > len) { 680 wpa_printf(MSG_INFO, "RADIUS: Invalid message length"); 681 return NULL; 682 } 683 684 if (msg_len < len) { 685 wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after " 686 "RADIUS message", (unsigned long) len - msg_len); 687 } 688 689 msg = os_zalloc(sizeof(*msg)); 690 if (msg == NULL) 691 return NULL; 692 693 msg->buf = wpabuf_alloc_copy(data, msg_len); 694 if (msg->buf == NULL || radius_msg_initialize(msg)) { 695 radius_msg_free(msg); 696 return NULL; 697 } 698 msg->hdr = wpabuf_mhead(msg->buf); 699 700 /* parse attributes */ 701 pos = wpabuf_mhead_u8(msg->buf) + sizeof(struct radius_hdr); 702 end = wpabuf_mhead_u8(msg->buf) + wpabuf_len(msg->buf); 703 while (pos < end) { 704 if ((size_t) (end - pos) < sizeof(*attr)) 705 goto fail; 706 707 attr = (struct radius_attr_hdr *) pos; 708 709 if (attr->length > end - pos || attr->length < sizeof(*attr)) 710 goto fail; 711 712 /* TODO: check that attr->length is suitable for attr->type */ 713 714 if (radius_msg_add_attr_to_array(msg, attr)) 715 goto fail; 716 717 pos += attr->length; 718 } 719 720 return msg; 721 722 fail: 723 radius_msg_free(msg); 724 return NULL; 725 } 726 727 728 int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len) 729 { 730 const u8 *pos = data; 731 size_t left = data_len; 732 733 while (left > 0) { 734 int len; 735 if (left > RADIUS_MAX_ATTR_LEN) 736 len = RADIUS_MAX_ATTR_LEN; 737 else 738 len = left; 739 740 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE, 741 pos, len)) 742 return 0; 743 744 pos += len; 745 left -= len; 746 } 747 748 return 1; 749 } 750 751 752 struct wpabuf * radius_msg_get_eap(struct radius_msg *msg) 753 { 754 struct wpabuf *eap; 755 size_t len, i; 756 struct radius_attr_hdr *attr; 757 758 if (msg == NULL) 759 return NULL; 760 761 len = 0; 762 for (i = 0; i < msg->attr_used; i++) { 763 attr = radius_get_attr_hdr(msg, i); 764 if (attr->type == RADIUS_ATTR_EAP_MESSAGE && 765 attr->length > sizeof(struct radius_attr_hdr)) 766 len += attr->length - sizeof(struct radius_attr_hdr); 767 } 768 769 if (len == 0) 770 return NULL; 771 772 eap = wpabuf_alloc(len); 773 if (eap == NULL) 774 return NULL; 775 776 for (i = 0; i < msg->attr_used; i++) { 777 attr = radius_get_attr_hdr(msg, i); 778 if (attr->type == RADIUS_ATTR_EAP_MESSAGE && 779 attr->length > sizeof(struct radius_attr_hdr)) { 780 int flen = attr->length - sizeof(*attr); 781 wpabuf_put_data(eap, attr + 1, flen); 782 } 783 } 784 785 return eap; 786 } 787 788 789 int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret, 790 size_t secret_len, const u8 *req_auth) 791 { 792 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN]; 793 u8 orig_authenticator[16]; 794 struct radius_attr_hdr *attr = NULL, *tmp; 795 size_t i; 796 797 for (i = 0; i < msg->attr_used; i++) { 798 tmp = radius_get_attr_hdr(msg, i); 799 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) { 800 if (attr != NULL) { 801 wpa_printf(MSG_INFO, "Multiple Message-Authenticator attributes in RADIUS message"); 802 return 1; 803 } 804 attr = tmp; 805 } 806 } 807 808 if (attr == NULL) { 809 wpa_printf(MSG_INFO, "No Message-Authenticator attribute found"); 810 return 1; 811 } 812 813 os_memcpy(orig, attr + 1, MD5_MAC_LEN); 814 os_memset(attr + 1, 0, MD5_MAC_LEN); 815 if (req_auth) { 816 os_memcpy(orig_authenticator, msg->hdr->authenticator, 817 sizeof(orig_authenticator)); 818 os_memcpy(msg->hdr->authenticator, req_auth, 819 sizeof(msg->hdr->authenticator)); 820 } 821 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 822 wpabuf_len(msg->buf), auth); 823 os_memcpy(attr + 1, orig, MD5_MAC_LEN); 824 if (req_auth) { 825 os_memcpy(msg->hdr->authenticator, orig_authenticator, 826 sizeof(orig_authenticator)); 827 } 828 829 if (os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0) { 830 wpa_printf(MSG_INFO, "Invalid Message-Authenticator!"); 831 return 1; 832 } 833 834 return 0; 835 } 836 837 838 int radius_msg_verify(struct radius_msg *msg, const u8 *secret, 839 size_t secret_len, struct radius_msg *sent_msg, int auth) 840 { 841 const u8 *addr[4]; 842 size_t len[4]; 843 u8 hash[MD5_MAC_LEN]; 844 845 if (sent_msg == NULL) { 846 wpa_printf(MSG_INFO, "No matching Access-Request message found"); 847 return 1; 848 } 849 850 if (auth && 851 radius_msg_verify_msg_auth(msg, secret, secret_len, 852 sent_msg->hdr->authenticator)) { 853 return 1; 854 } 855 856 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */ 857 addr[0] = (u8 *) msg->hdr; 858 len[0] = 1 + 1 + 2; 859 addr[1] = sent_msg->hdr->authenticator; 860 len[1] = MD5_MAC_LEN; 861 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr); 862 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 863 addr[3] = secret; 864 len[3] = secret_len; 865 md5_vector(4, addr, len, hash); 866 if (os_memcmp_const(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) { 867 wpa_printf(MSG_INFO, "Response Authenticator invalid!"); 868 return 1; 869 } 870 871 return 0; 872 } 873 874 875 int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src, 876 u8 type) 877 { 878 struct radius_attr_hdr *attr; 879 size_t i; 880 int count = 0; 881 882 for (i = 0; i < src->attr_used; i++) { 883 attr = radius_get_attr_hdr(src, i); 884 if (attr->type == type && attr->length >= sizeof(*attr)) { 885 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1), 886 attr->length - sizeof(*attr))) 887 return -1; 888 count++; 889 } 890 } 891 892 return count; 893 } 894 895 896 /* Create Request Authenticator. The value should be unique over the lifetime 897 * of the shared secret between authenticator and authentication server. 898 */ 899 int radius_msg_make_authenticator(struct radius_msg *msg) 900 { 901 return os_get_random((u8 *) &msg->hdr->authenticator, 902 sizeof(msg->hdr->authenticator)); 903 } 904 905 906 /* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message. 907 * Returns the Attribute payload and sets alen to indicate the length of the 908 * payload if a vendor attribute with subtype is found, otherwise returns NULL. 909 * The returned payload is allocated with os_malloc() and caller must free it 910 * by calling os_free(). 911 */ 912 static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor, 913 u8 subtype, size_t *alen) 914 { 915 u8 *data, *pos; 916 size_t i, len; 917 918 if (msg == NULL) 919 return NULL; 920 921 for (i = 0; i < msg->attr_used; i++) { 922 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i); 923 size_t left; 924 u32 vendor_id; 925 struct radius_attr_vendor *vhdr; 926 927 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC || 928 attr->length < sizeof(*attr)) 929 continue; 930 931 left = attr->length - sizeof(*attr); 932 if (left < 4) 933 continue; 934 935 pos = (u8 *) (attr + 1); 936 937 os_memcpy(&vendor_id, pos, 4); 938 pos += 4; 939 left -= 4; 940 941 if (ntohl(vendor_id) != vendor) 942 continue; 943 944 while (left >= sizeof(*vhdr)) { 945 vhdr = (struct radius_attr_vendor *) pos; 946 if (vhdr->vendor_length > left || 947 vhdr->vendor_length < sizeof(*vhdr)) { 948 break; 949 } 950 if (vhdr->vendor_type != subtype) { 951 pos += vhdr->vendor_length; 952 left -= vhdr->vendor_length; 953 continue; 954 } 955 956 len = vhdr->vendor_length - sizeof(*vhdr); 957 data = os_malloc(len); 958 if (data == NULL) 959 return NULL; 960 os_memcpy(data, pos + sizeof(*vhdr), len); 961 if (alen) 962 *alen = len; 963 return data; 964 } 965 } 966 967 return NULL; 968 } 969 970 971 static u8 * decrypt_ms_key(const u8 *key, size_t len, 972 const u8 *req_authenticator, 973 const u8 *secret, size_t secret_len, size_t *reslen) 974 { 975 u8 *plain, *ppos, *res; 976 const u8 *pos; 977 size_t left, plen; 978 u8 hash[MD5_MAC_LEN]; 979 int i, first = 1; 980 const u8 *addr[3]; 981 size_t elen[3]; 982 983 /* key: 16-bit salt followed by encrypted key info */ 984 985 if (len < 2 + 16) { 986 wpa_printf(MSG_DEBUG, "RADIUS: %s: Len is too small: %d", 987 __func__, (int) len); 988 return NULL; 989 } 990 991 pos = key + 2; 992 left = len - 2; 993 if (left % 16) { 994 wpa_printf(MSG_INFO, "RADIUS: Invalid ms key len %lu", 995 (unsigned long) left); 996 return NULL; 997 } 998 999 plen = left; 1000 ppos = plain = os_malloc(plen); 1001 if (plain == NULL) 1002 return NULL; 1003 plain[0] = 0; 1004 1005 while (left > 0) { 1006 /* b(1) = MD5(Secret + Request-Authenticator + Salt) 1007 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */ 1008 1009 addr[0] = secret; 1010 elen[0] = secret_len; 1011 if (first) { 1012 addr[1] = req_authenticator; 1013 elen[1] = MD5_MAC_LEN; 1014 addr[2] = key; 1015 elen[2] = 2; /* Salt */ 1016 } else { 1017 addr[1] = pos - MD5_MAC_LEN; 1018 elen[1] = MD5_MAC_LEN; 1019 } 1020 md5_vector(first ? 3 : 2, addr, elen, hash); 1021 first = 0; 1022 1023 for (i = 0; i < MD5_MAC_LEN; i++) 1024 *ppos++ = *pos++ ^ hash[i]; 1025 left -= MD5_MAC_LEN; 1026 } 1027 1028 if (plain[0] == 0 || plain[0] > plen - 1) { 1029 wpa_printf(MSG_INFO, "RADIUS: Failed to decrypt MPPE key"); 1030 os_free(plain); 1031 return NULL; 1032 } 1033 1034 res = os_malloc(plain[0]); 1035 if (res == NULL) { 1036 os_free(plain); 1037 return NULL; 1038 } 1039 os_memcpy(res, plain + 1, plain[0]); 1040 if (reslen) 1041 *reslen = plain[0]; 1042 os_free(plain); 1043 return res; 1044 } 1045 1046 1047 static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt, 1048 const u8 *req_authenticator, 1049 const u8 *secret, size_t secret_len, 1050 u8 *ebuf, size_t *elen) 1051 { 1052 int i, len, first = 1; 1053 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos; 1054 const u8 *addr[3]; 1055 size_t _len[3]; 1056 1057 WPA_PUT_BE16(saltbuf, salt); 1058 1059 len = 1 + key_len; 1060 if (len & 0x0f) { 1061 len = (len & 0xf0) + 16; 1062 } 1063 os_memset(ebuf, 0, len); 1064 ebuf[0] = key_len; 1065 os_memcpy(ebuf + 1, key, key_len); 1066 1067 *elen = len; 1068 1069 pos = ebuf; 1070 while (len > 0) { 1071 /* b(1) = MD5(Secret + Request-Authenticator + Salt) 1072 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */ 1073 addr[0] = secret; 1074 _len[0] = secret_len; 1075 if (first) { 1076 addr[1] = req_authenticator; 1077 _len[1] = MD5_MAC_LEN; 1078 addr[2] = saltbuf; 1079 _len[2] = sizeof(saltbuf); 1080 } else { 1081 addr[1] = pos - MD5_MAC_LEN; 1082 _len[1] = MD5_MAC_LEN; 1083 } 1084 md5_vector(first ? 3 : 2, addr, _len, hash); 1085 first = 0; 1086 1087 for (i = 0; i < MD5_MAC_LEN; i++) 1088 *pos++ ^= hash[i]; 1089 1090 len -= MD5_MAC_LEN; 1091 } 1092 } 1093 1094 1095 struct radius_ms_mppe_keys * 1096 radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg, 1097 const u8 *secret, size_t secret_len) 1098 { 1099 u8 *key; 1100 size_t keylen; 1101 struct radius_ms_mppe_keys *keys; 1102 1103 if (msg == NULL || sent_msg == NULL) 1104 return NULL; 1105 1106 keys = os_zalloc(sizeof(*keys)); 1107 if (keys == NULL) 1108 return NULL; 1109 1110 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT, 1111 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY, 1112 &keylen); 1113 if (key) { 1114 keys->send = decrypt_ms_key(key, keylen, 1115 sent_msg->hdr->authenticator, 1116 secret, secret_len, 1117 &keys->send_len); 1118 if (!keys->send) { 1119 wpa_printf(MSG_DEBUG, 1120 "RADIUS: Failed to decrypt send key"); 1121 } 1122 os_free(key); 1123 } 1124 1125 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT, 1126 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY, 1127 &keylen); 1128 if (key) { 1129 keys->recv = decrypt_ms_key(key, keylen, 1130 sent_msg->hdr->authenticator, 1131 secret, secret_len, 1132 &keys->recv_len); 1133 if (!keys->recv) { 1134 wpa_printf(MSG_DEBUG, 1135 "RADIUS: Failed to decrypt recv key"); 1136 } 1137 os_free(key); 1138 } 1139 1140 return keys; 1141 } 1142 1143 1144 struct radius_ms_mppe_keys * 1145 radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg, 1146 const u8 *secret, size_t secret_len) 1147 { 1148 u8 *key; 1149 size_t keylen; 1150 struct radius_ms_mppe_keys *keys; 1151 1152 if (msg == NULL || sent_msg == NULL) 1153 return NULL; 1154 1155 keys = os_zalloc(sizeof(*keys)); 1156 if (keys == NULL) 1157 return NULL; 1158 1159 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO, 1160 RADIUS_CISCO_AV_PAIR, &keylen); 1161 if (key && keylen == 51 && 1162 os_memcmp(key, "leap:session-key=", 17) == 0) { 1163 keys->recv = decrypt_ms_key(key + 17, keylen - 17, 1164 sent_msg->hdr->authenticator, 1165 secret, secret_len, 1166 &keys->recv_len); 1167 } 1168 os_free(key); 1169 1170 return keys; 1171 } 1172 1173 1174 int radius_msg_add_mppe_keys(struct radius_msg *msg, 1175 const u8 *req_authenticator, 1176 const u8 *secret, size_t secret_len, 1177 const u8 *send_key, size_t send_key_len, 1178 const u8 *recv_key, size_t recv_key_len) 1179 { 1180 struct radius_attr_hdr *attr; 1181 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT); 1182 u8 *buf; 1183 struct radius_attr_vendor *vhdr; 1184 u8 *pos; 1185 size_t elen; 1186 int hlen; 1187 u16 salt; 1188 1189 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2; 1190 1191 /* MS-MPPE-Send-Key */ 1192 buf = os_malloc(hlen + send_key_len + 16); 1193 if (buf == NULL) { 1194 return 0; 1195 } 1196 pos = buf; 1197 os_memcpy(pos, &vendor_id, sizeof(vendor_id)); 1198 pos += sizeof(vendor_id); 1199 vhdr = (struct radius_attr_vendor *) pos; 1200 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY; 1201 pos = (u8 *) (vhdr + 1); 1202 if (os_get_random((u8 *) &salt, sizeof(salt)) < 0) 1203 return 0; 1204 salt |= 0x8000; 1205 WPA_PUT_BE16(pos, salt); 1206 pos += 2; 1207 encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret, 1208 secret_len, pos, &elen); 1209 vhdr->vendor_length = hlen + elen - sizeof(vendor_id); 1210 1211 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC, 1212 buf, hlen + elen); 1213 os_free(buf); 1214 if (attr == NULL) { 1215 return 0; 1216 } 1217 1218 /* MS-MPPE-Recv-Key */ 1219 buf = os_malloc(hlen + recv_key_len + 16); 1220 if (buf == NULL) { 1221 return 0; 1222 } 1223 pos = buf; 1224 os_memcpy(pos, &vendor_id, sizeof(vendor_id)); 1225 pos += sizeof(vendor_id); 1226 vhdr = (struct radius_attr_vendor *) pos; 1227 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY; 1228 pos = (u8 *) (vhdr + 1); 1229 salt ^= 1; 1230 WPA_PUT_BE16(pos, salt); 1231 pos += 2; 1232 encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret, 1233 secret_len, pos, &elen); 1234 vhdr->vendor_length = hlen + elen - sizeof(vendor_id); 1235 1236 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC, 1237 buf, hlen + elen); 1238 os_free(buf); 1239 if (attr == NULL) { 1240 return 0; 1241 } 1242 1243 return 1; 1244 } 1245 1246 1247 int radius_msg_add_wfa(struct radius_msg *msg, u8 subtype, const u8 *data, 1248 size_t len) 1249 { 1250 struct radius_attr_hdr *attr; 1251 u8 *buf, *pos; 1252 size_t alen; 1253 1254 alen = 4 + 2 + len; 1255 buf = os_malloc(alen); 1256 if (buf == NULL) 1257 return 0; 1258 pos = buf; 1259 WPA_PUT_BE32(pos, RADIUS_VENDOR_ID_WFA); 1260 pos += 4; 1261 *pos++ = subtype; 1262 *pos++ = 2 + len; 1263 os_memcpy(pos, data, len); 1264 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC, 1265 buf, alen); 1266 os_free(buf); 1267 if (attr == NULL) 1268 return 0; 1269 1270 return 1; 1271 } 1272 1273 1274 int radius_user_password_hide(struct radius_msg *msg, 1275 const u8 *data, size_t data_len, 1276 const u8 *secret, size_t secret_len, 1277 u8 *buf, size_t buf_len) 1278 { 1279 size_t padlen, i, pos; 1280 const u8 *addr[2]; 1281 size_t len[2]; 1282 u8 hash[16]; 1283 1284 if (data_len + 16 > buf_len) 1285 return -1; 1286 1287 os_memcpy(buf, data, data_len); 1288 1289 padlen = data_len % 16; 1290 if (padlen && data_len < buf_len) { 1291 padlen = 16 - padlen; 1292 os_memset(buf + data_len, 0, padlen); 1293 buf_len = data_len + padlen; 1294 } else { 1295 buf_len = data_len; 1296 } 1297 1298 addr[0] = secret; 1299 len[0] = secret_len; 1300 addr[1] = msg->hdr->authenticator; 1301 len[1] = 16; 1302 md5_vector(2, addr, len, hash); 1303 1304 for (i = 0; i < 16; i++) 1305 buf[i] ^= hash[i]; 1306 pos = 16; 1307 1308 while (pos < buf_len) { 1309 addr[0] = secret; 1310 len[0] = secret_len; 1311 addr[1] = &buf[pos - 16]; 1312 len[1] = 16; 1313 md5_vector(2, addr, len, hash); 1314 1315 for (i = 0; i < 16; i++) 1316 buf[pos + i] ^= hash[i]; 1317 1318 pos += 16; 1319 } 1320 1321 return buf_len; 1322 } 1323 1324 1325 /* Add User-Password attribute to a RADIUS message and encrypt it as specified 1326 * in RFC 2865, Chap. 5.2 */ 1327 struct radius_attr_hdr * 1328 radius_msg_add_attr_user_password(struct radius_msg *msg, 1329 const u8 *data, size_t data_len, 1330 const u8 *secret, size_t secret_len) 1331 { 1332 u8 buf[128]; 1333 int res; 1334 1335 res = radius_user_password_hide(msg, data, data_len, 1336 secret, secret_len, buf, sizeof(buf)); 1337 if (res < 0) 1338 return NULL; 1339 1340 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD, 1341 buf, res); 1342 } 1343 1344 1345 int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len) 1346 { 1347 struct radius_attr_hdr *attr = NULL, *tmp; 1348 size_t i, dlen; 1349 1350 for (i = 0; i < msg->attr_used; i++) { 1351 tmp = radius_get_attr_hdr(msg, i); 1352 if (tmp->type == type) { 1353 attr = tmp; 1354 break; 1355 } 1356 } 1357 1358 if (!attr || attr->length < sizeof(*attr)) 1359 return -1; 1360 1361 dlen = attr->length - sizeof(*attr); 1362 if (buf) 1363 os_memcpy(buf, (attr + 1), dlen > len ? len : dlen); 1364 return dlen; 1365 } 1366 1367 1368 int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf, 1369 size_t *len, const u8 *start) 1370 { 1371 size_t i; 1372 struct radius_attr_hdr *attr = NULL, *tmp; 1373 1374 for (i = 0; i < msg->attr_used; i++) { 1375 tmp = radius_get_attr_hdr(msg, i); 1376 if (tmp->type == type && 1377 (start == NULL || (u8 *) tmp > start)) { 1378 attr = tmp; 1379 break; 1380 } 1381 } 1382 1383 if (!attr || attr->length < sizeof(*attr)) 1384 return -1; 1385 1386 *buf = (u8 *) (attr + 1); 1387 *len = attr->length - sizeof(*attr); 1388 return 0; 1389 } 1390 1391 1392 int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len) 1393 { 1394 size_t i; 1395 int count; 1396 1397 for (count = 0, i = 0; i < msg->attr_used; i++) { 1398 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i); 1399 if (attr->type == type && 1400 attr->length >= sizeof(struct radius_attr_hdr) + min_len) 1401 count++; 1402 } 1403 1404 return count; 1405 } 1406 1407 1408 struct radius_tunnel_attrs { 1409 int tag_used; 1410 int type; /* Tunnel-Type */ 1411 int medium_type; /* Tunnel-Medium-Type */ 1412 int vlanid; 1413 }; 1414 1415 1416 static int cmp_int(const void *a, const void *b) 1417 { 1418 int x, y; 1419 1420 x = *((int *) a); 1421 y = *((int *) b); 1422 return (x - y); 1423 } 1424 1425 1426 /** 1427 * radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information 1428 * The k tagged vlans found are sorted by vlan_id and stored in the first k 1429 * items of tagged. 1430 * 1431 * @msg: RADIUS message 1432 * @untagged: Pointer to store untagged vid 1433 * @numtagged: Size of tagged 1434 * @tagged: Pointer to store tagged list 1435 * 1436 * Returns: 0 if neither tagged nor untagged configuration is found, 1 otherwise 1437 */ 1438 int radius_msg_get_vlanid(struct radius_msg *msg, int *untagged, int numtagged, 1439 int *tagged) 1440 { 1441 struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun; 1442 size_t i; 1443 struct radius_attr_hdr *attr = NULL; 1444 const u8 *data; 1445 char buf[10]; 1446 size_t dlen; 1447 int j, taggedidx = 0, vlan_id; 1448 1449 os_memset(&tunnel, 0, sizeof(tunnel)); 1450 for (j = 0; j < numtagged; j++) 1451 tagged[j] = 0; 1452 *untagged = 0; 1453 1454 for (i = 0; i < msg->attr_used; i++) { 1455 attr = radius_get_attr_hdr(msg, i); 1456 if (attr->length < sizeof(*attr)) 1457 return -1; 1458 data = (const u8 *) (attr + 1); 1459 dlen = attr->length - sizeof(*attr); 1460 if (attr->length < 3) 1461 continue; 1462 if (data[0] >= RADIUS_TUNNEL_TAGS) 1463 tun = &tunnel[0]; 1464 else 1465 tun = &tunnel[data[0]]; 1466 1467 switch (attr->type) { 1468 case RADIUS_ATTR_TUNNEL_TYPE: 1469 if (attr->length != 6) 1470 break; 1471 tun->tag_used++; 1472 tun->type = WPA_GET_BE24(data + 1); 1473 break; 1474 case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE: 1475 if (attr->length != 6) 1476 break; 1477 tun->tag_used++; 1478 tun->medium_type = WPA_GET_BE24(data + 1); 1479 break; 1480 case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID: 1481 if (data[0] < RADIUS_TUNNEL_TAGS) { 1482 data++; 1483 dlen--; 1484 } 1485 if (dlen >= sizeof(buf)) 1486 break; 1487 os_memcpy(buf, data, dlen); 1488 buf[dlen] = '\0'; 1489 vlan_id = atoi(buf); 1490 if (vlan_id <= 0) 1491 break; 1492 tun->tag_used++; 1493 tun->vlanid = vlan_id; 1494 break; 1495 case RADIUS_ATTR_EGRESS_VLANID: /* RFC 4675 */ 1496 if (attr->length != 6) 1497 break; 1498 vlan_id = WPA_GET_BE24(data + 1); 1499 if (vlan_id <= 0) 1500 break; 1501 if (data[0] == 0x32) 1502 *untagged = vlan_id; 1503 else if (data[0] == 0x31 && tagged && 1504 taggedidx < numtagged) 1505 tagged[taggedidx++] = vlan_id; 1506 break; 1507 } 1508 } 1509 1510 /* Use tunnel with the lowest tag for untagged VLAN id */ 1511 for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) { 1512 tun = &tunnel[i]; 1513 if (tun->tag_used && 1514 tun->type == RADIUS_TUNNEL_TYPE_VLAN && 1515 tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 && 1516 tun->vlanid > 0) { 1517 *untagged = tun->vlanid; 1518 break; 1519 } 1520 } 1521 1522 if (taggedidx) 1523 qsort(tagged, taggedidx, sizeof(int), cmp_int); 1524 1525 if (*untagged > 0 || taggedidx) 1526 return 1; 1527 return 0; 1528 } 1529 1530 1531 /** 1532 * radius_msg_get_tunnel_password - Parse RADIUS attribute Tunnel-Password 1533 * @msg: Received RADIUS message 1534 * @keylen: Length of returned password 1535 * @secret: RADIUS shared secret 1536 * @secret_len: Length of secret 1537 * @sent_msg: Sent RADIUS message 1538 * @n: Number of password attribute to return (starting with 0) 1539 * Returns: Pointer to n-th password (free with os_free) or %NULL 1540 */ 1541 char * radius_msg_get_tunnel_password(struct radius_msg *msg, int *keylen, 1542 const u8 *secret, size_t secret_len, 1543 struct radius_msg *sent_msg, size_t n) 1544 { 1545 u8 *buf = NULL; 1546 size_t buflen; 1547 const u8 *salt; 1548 u8 *str; 1549 const u8 *addr[3]; 1550 size_t len[3]; 1551 u8 hash[16]; 1552 u8 *pos; 1553 size_t i, j = 0; 1554 struct radius_attr_hdr *attr; 1555 const u8 *data; 1556 size_t dlen; 1557 const u8 *fdata = NULL; /* points to found item */ 1558 size_t fdlen = -1; 1559 char *ret = NULL; 1560 1561 /* find n-th valid Tunnel-Password attribute */ 1562 for (i = 0; i < msg->attr_used; i++) { 1563 attr = radius_get_attr_hdr(msg, i); 1564 if (attr == NULL || 1565 attr->type != RADIUS_ATTR_TUNNEL_PASSWORD) { 1566 continue; 1567 } 1568 if (attr->length <= 5) 1569 continue; 1570 data = (const u8 *) (attr + 1); 1571 dlen = attr->length - sizeof(*attr); 1572 if (dlen <= 3 || dlen % 16 != 3) 1573 continue; 1574 j++; 1575 if (j <= n) 1576 continue; 1577 1578 fdata = data; 1579 fdlen = dlen; 1580 break; 1581 } 1582 if (fdata == NULL) 1583 goto out; 1584 1585 /* alloc writable memory for decryption */ 1586 buf = os_malloc(fdlen); 1587 if (buf == NULL) 1588 goto out; 1589 os_memcpy(buf, fdata, fdlen); 1590 buflen = fdlen; 1591 1592 /* init pointers */ 1593 salt = buf + 1; 1594 str = buf + 3; 1595 1596 /* decrypt blocks */ 1597 pos = buf + buflen - 16; /* last block */ 1598 while (pos >= str + 16) { /* all but the first block */ 1599 addr[0] = secret; 1600 len[0] = secret_len; 1601 addr[1] = pos - 16; 1602 len[1] = 16; 1603 md5_vector(2, addr, len, hash); 1604 1605 for (i = 0; i < 16; i++) 1606 pos[i] ^= hash[i]; 1607 1608 pos -= 16; 1609 } 1610 1611 /* decrypt first block */ 1612 if (str != pos) 1613 goto out; 1614 addr[0] = secret; 1615 len[0] = secret_len; 1616 addr[1] = sent_msg->hdr->authenticator; 1617 len[1] = 16; 1618 addr[2] = salt; 1619 len[2] = 2; 1620 md5_vector(3, addr, len, hash); 1621 1622 for (i = 0; i < 16; i++) 1623 pos[i] ^= hash[i]; 1624 1625 /* derive plaintext length from first subfield */ 1626 *keylen = (unsigned char) str[0]; 1627 if ((u8 *) (str + *keylen) >= (u8 *) (buf + buflen)) { 1628 /* decryption error - invalid key length */ 1629 goto out; 1630 } 1631 if (*keylen == 0) { 1632 /* empty password */ 1633 goto out; 1634 } 1635 1636 /* copy passphrase into new buffer */ 1637 ret = os_malloc(*keylen); 1638 if (ret) 1639 os_memcpy(ret, str + 1, *keylen); 1640 1641 out: 1642 /* return new buffer */ 1643 os_free(buf); 1644 return ret; 1645 } 1646 1647 1648 void radius_free_class(struct radius_class_data *c) 1649 { 1650 size_t i; 1651 if (c == NULL) 1652 return; 1653 for (i = 0; i < c->count; i++) 1654 os_free(c->attr[i].data); 1655 os_free(c->attr); 1656 c->attr = NULL; 1657 c->count = 0; 1658 } 1659 1660 1661 int radius_copy_class(struct radius_class_data *dst, 1662 const struct radius_class_data *src) 1663 { 1664 size_t i; 1665 1666 if (src->attr == NULL) 1667 return 0; 1668 1669 dst->attr = os_calloc(src->count, sizeof(struct radius_attr_data)); 1670 if (dst->attr == NULL) 1671 return -1; 1672 1673 dst->count = 0; 1674 1675 for (i = 0; i < src->count; i++) { 1676 dst->attr[i].data = os_malloc(src->attr[i].len); 1677 if (dst->attr[i].data == NULL) 1678 break; 1679 dst->count++; 1680 os_memcpy(dst->attr[i].data, src->attr[i].data, 1681 src->attr[i].len); 1682 dst->attr[i].len = src->attr[i].len; 1683 } 1684 1685 return 0; 1686 } 1687 1688 1689 u8 radius_msg_find_unlisted_attr(struct radius_msg *msg, u8 *attrs) 1690 { 1691 size_t i, j; 1692 struct radius_attr_hdr *attr; 1693 1694 for (i = 0; i < msg->attr_used; i++) { 1695 attr = radius_get_attr_hdr(msg, i); 1696 1697 for (j = 0; attrs[j]; j++) { 1698 if (attr->type == attrs[j]) 1699 break; 1700 } 1701 1702 if (attrs[j] == 0) 1703 return attr->type; /* unlisted attr */ 1704 } 1705 1706 return 0; 1707 } 1708 1709 1710 int radius_gen_session_id(u8 *id, size_t len) 1711 { 1712 /* 1713 * Acct-Session-Id and Acct-Multi-Session-Id should be globally and 1714 * temporarily unique. A high quality random number is required 1715 * therefore. This could be be improved by switching to a GUID. 1716 */ 1717 return os_get_random(id, len); 1718 } 1719
