radius.c revision c28170251eb54dbf64a9074a07fee377587425b2
1/* 2 * RADIUS message processing 3 * Copyright (c) 2002-2009, 2011-2014, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9#include "utils/includes.h" 10 11#include "utils/common.h" 12#include "utils/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 */ 21struct 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 52struct radius_hdr * radius_msg_get_hdr(struct radius_msg *msg) 53{ 54 return msg->hdr; 55} 56 57 58struct wpabuf * radius_msg_get_buf(struct radius_msg *msg) 59{ 60 return msg->buf; 61} 62 63 64static struct radius_attr_hdr * 65radius_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 72static 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 79static 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 */ 102struct 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 */ 127void 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 138static 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 161struct 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 170static struct radius_attr_type radius_attrs[] = 171{ 172 { RADIUS_ATTR_USER_NAME, "User-Name", RADIUS_ATTR_TEXT }, 173 { RADIUS_ATTR_USER_PASSWORD, "User-Password", RADIUS_ATTR_UNDIST }, 174 { RADIUS_ATTR_NAS_IP_ADDRESS, "NAS-IP-Address", RADIUS_ATTR_IP }, 175 { RADIUS_ATTR_NAS_PORT, "NAS-Port", RADIUS_ATTR_INT32 }, 176 { RADIUS_ATTR_FRAMED_MTU, "Framed-MTU", RADIUS_ATTR_INT32 }, 177 { RADIUS_ATTR_REPLY_MESSAGE, "Reply-Message", RADIUS_ATTR_TEXT }, 178 { RADIUS_ATTR_STATE, "State", RADIUS_ATTR_UNDIST }, 179 { RADIUS_ATTR_CLASS, "Class", RADIUS_ATTR_UNDIST }, 180 { RADIUS_ATTR_VENDOR_SPECIFIC, "Vendor-Specific", RADIUS_ATTR_UNDIST }, 181 { RADIUS_ATTR_SESSION_TIMEOUT, "Session-Timeout", RADIUS_ATTR_INT32 }, 182 { RADIUS_ATTR_IDLE_TIMEOUT, "Idle-Timeout", RADIUS_ATTR_INT32 }, 183 { RADIUS_ATTR_TERMINATION_ACTION, "Termination-Action", 184 RADIUS_ATTR_INT32 }, 185 { RADIUS_ATTR_CALLED_STATION_ID, "Called-Station-Id", 186 RADIUS_ATTR_TEXT }, 187 { RADIUS_ATTR_CALLING_STATION_ID, "Calling-Station-Id", 188 RADIUS_ATTR_TEXT }, 189 { RADIUS_ATTR_NAS_IDENTIFIER, "NAS-Identifier", RADIUS_ATTR_TEXT }, 190 { RADIUS_ATTR_PROXY_STATE, "Proxy-State", RADIUS_ATTR_UNDIST }, 191 { RADIUS_ATTR_ACCT_STATUS_TYPE, "Acct-Status-Type", 192 RADIUS_ATTR_INT32 }, 193 { RADIUS_ATTR_ACCT_DELAY_TIME, "Acct-Delay-Time", RADIUS_ATTR_INT32 }, 194 { RADIUS_ATTR_ACCT_INPUT_OCTETS, "Acct-Input-Octets", 195 RADIUS_ATTR_INT32 }, 196 { RADIUS_ATTR_ACCT_OUTPUT_OCTETS, "Acct-Output-Octets", 197 RADIUS_ATTR_INT32 }, 198 { RADIUS_ATTR_ACCT_SESSION_ID, "Acct-Session-Id", RADIUS_ATTR_TEXT }, 199 { RADIUS_ATTR_ACCT_AUTHENTIC, "Acct-Authentic", RADIUS_ATTR_INT32 }, 200 { RADIUS_ATTR_ACCT_SESSION_TIME, "Acct-Session-Time", 201 RADIUS_ATTR_INT32 }, 202 { RADIUS_ATTR_ACCT_INPUT_PACKETS, "Acct-Input-Packets", 203 RADIUS_ATTR_INT32 }, 204 { RADIUS_ATTR_ACCT_OUTPUT_PACKETS, "Acct-Output-Packets", 205 RADIUS_ATTR_INT32 }, 206 { RADIUS_ATTR_ACCT_TERMINATE_CAUSE, "Acct-Terminate-Cause", 207 RADIUS_ATTR_INT32 }, 208 { RADIUS_ATTR_ACCT_MULTI_SESSION_ID, "Acct-Multi-Session-Id", 209 RADIUS_ATTR_TEXT }, 210 { RADIUS_ATTR_ACCT_LINK_COUNT, "Acct-Link-Count", RADIUS_ATTR_INT32 }, 211 { RADIUS_ATTR_ACCT_INPUT_GIGAWORDS, "Acct-Input-Gigawords", 212 RADIUS_ATTR_INT32 }, 213 { RADIUS_ATTR_ACCT_OUTPUT_GIGAWORDS, "Acct-Output-Gigawords", 214 RADIUS_ATTR_INT32 }, 215 { RADIUS_ATTR_EVENT_TIMESTAMP, "Event-Timestamp", 216 RADIUS_ATTR_INT32 }, 217 { RADIUS_ATTR_NAS_PORT_TYPE, "NAS-Port-Type", RADIUS_ATTR_INT32 }, 218 { RADIUS_ATTR_TUNNEL_TYPE, "Tunnel-Type", RADIUS_ATTR_HEXDUMP }, 219 { RADIUS_ATTR_TUNNEL_MEDIUM_TYPE, "Tunnel-Medium-Type", 220 RADIUS_ATTR_HEXDUMP }, 221 { RADIUS_ATTR_TUNNEL_PASSWORD, "Tunnel-Password", 222 RADIUS_ATTR_UNDIST }, 223 { RADIUS_ATTR_CONNECT_INFO, "Connect-Info", RADIUS_ATTR_TEXT }, 224 { RADIUS_ATTR_EAP_MESSAGE, "EAP-Message", RADIUS_ATTR_UNDIST }, 225 { RADIUS_ATTR_MESSAGE_AUTHENTICATOR, "Message-Authenticator", 226 RADIUS_ATTR_UNDIST }, 227 { RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID, "Tunnel-Private-Group-Id", 228 RADIUS_ATTR_HEXDUMP }, 229 { RADIUS_ATTR_ACCT_INTERIM_INTERVAL, "Acct-Interim-Interval", 230 RADIUS_ATTR_INT32 }, 231 { RADIUS_ATTR_CHARGEABLE_USER_IDENTITY, "Chargeable-User-Identity", 232 RADIUS_ATTR_TEXT }, 233 { RADIUS_ATTR_NAS_IPV6_ADDRESS, "NAS-IPv6-Address", RADIUS_ATTR_IPV6 }, 234 { RADIUS_ATTR_ERROR_CAUSE, "Error-Cause", RADIUS_ATTR_INT32 }, 235 { RADIUS_ATTR_EAP_KEY_NAME, "EAP-Key-Name", RADIUS_ATTR_HEXDUMP }, 236}; 237#define RADIUS_ATTRS ARRAY_SIZE(radius_attrs) 238 239 240static struct radius_attr_type *radius_get_attr_type(u8 type) 241{ 242 size_t i; 243 244 for (i = 0; i < RADIUS_ATTRS; i++) { 245 if (type == radius_attrs[i].type) 246 return &radius_attrs[i]; 247 } 248 249 return NULL; 250} 251 252 253static void radius_msg_dump_attr(struct radius_attr_hdr *hdr) 254{ 255 struct radius_attr_type *attr; 256 int len; 257 unsigned char *pos; 258 char buf[1000]; 259 260 attr = radius_get_attr_type(hdr->type); 261 262 wpa_printf(MSG_INFO, " Attribute %d (%s) length=%d", 263 hdr->type, attr ? attr->name : "?Unknown?", hdr->length); 264 265 if (attr == NULL || hdr->length < sizeof(struct radius_attr_hdr)) 266 return; 267 268 len = hdr->length - sizeof(struct radius_attr_hdr); 269 pos = (unsigned char *) (hdr + 1); 270 271 switch (attr->data_type) { 272 case RADIUS_ATTR_TEXT: 273 printf_encode(buf, sizeof(buf), pos, len); 274 wpa_printf(MSG_INFO, " Value: '%s'", buf); 275 break; 276 277 case RADIUS_ATTR_IP: 278 if (len == 4) { 279 struct in_addr addr; 280 os_memcpy(&addr, pos, 4); 281 wpa_printf(MSG_INFO, " Value: %s", 282 inet_ntoa(addr)); 283 } else { 284 wpa_printf(MSG_INFO, " Invalid IP address length %d", 285 len); 286 } 287 break; 288 289#ifdef CONFIG_IPV6 290 case RADIUS_ATTR_IPV6: 291 if (len == 16) { 292 const char *atxt; 293 struct in6_addr *addr = (struct in6_addr *) pos; 294 atxt = inet_ntop(AF_INET6, addr, buf, sizeof(buf)); 295 wpa_printf(MSG_INFO, " Value: %s", 296 atxt ? atxt : "?"); 297 } else { 298 wpa_printf(MSG_INFO, " Invalid IPv6 address length %d", 299 len); 300 } 301 break; 302#endif /* CONFIG_IPV6 */ 303 304 case RADIUS_ATTR_HEXDUMP: 305 case RADIUS_ATTR_UNDIST: 306 wpa_snprintf_hex(buf, sizeof(buf), pos, len); 307 wpa_printf(MSG_INFO, " Value: %s", buf); 308 break; 309 310 case RADIUS_ATTR_INT32: 311 if (len == 4) 312 wpa_printf(MSG_INFO, " Value: %u", 313 WPA_GET_BE32(pos)); 314 else 315 wpa_printf(MSG_INFO, " Invalid INT32 length %d", 316 len); 317 break; 318 319 default: 320 break; 321 } 322} 323 324 325void radius_msg_dump(struct radius_msg *msg) 326{ 327 size_t i; 328 329 wpa_printf(MSG_INFO, "RADIUS message: code=%d (%s) identifier=%d length=%d", 330 msg->hdr->code, radius_code_string(msg->hdr->code), 331 msg->hdr->identifier, be_to_host16(msg->hdr->length)); 332 333 for (i = 0; i < msg->attr_used; i++) { 334 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i); 335 radius_msg_dump_attr(attr); 336 } 337} 338 339 340int radius_msg_finish(struct radius_msg *msg, const u8 *secret, 341 size_t secret_len) 342{ 343 if (secret) { 344 u8 auth[MD5_MAC_LEN]; 345 struct radius_attr_hdr *attr; 346 347 os_memset(auth, 0, MD5_MAC_LEN); 348 attr = radius_msg_add_attr(msg, 349 RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 350 auth, MD5_MAC_LEN); 351 if (attr == NULL) { 352 wpa_printf(MSG_WARNING, "RADIUS: Could not add " 353 "Message-Authenticator"); 354 return -1; 355 } 356 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 357 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 358 wpabuf_len(msg->buf), (u8 *) (attr + 1)); 359 } else 360 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 361 362 if (wpabuf_len(msg->buf) > 0xffff) { 363 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)", 364 (unsigned long) wpabuf_len(msg->buf)); 365 return -1; 366 } 367 return 0; 368} 369 370 371int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret, 372 size_t secret_len, const u8 *req_authenticator) 373{ 374 u8 auth[MD5_MAC_LEN]; 375 struct radius_attr_hdr *attr; 376 const u8 *addr[4]; 377 size_t len[4]; 378 379 os_memset(auth, 0, MD5_MAC_LEN); 380 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 381 auth, MD5_MAC_LEN); 382 if (attr == NULL) { 383 wpa_printf(MSG_ERROR, "WARNING: Could not add Message-Authenticator"); 384 return -1; 385 } 386 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 387 os_memcpy(msg->hdr->authenticator, req_authenticator, 388 sizeof(msg->hdr->authenticator)); 389 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 390 wpabuf_len(msg->buf), (u8 *) (attr + 1)); 391 392 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */ 393 addr[0] = (u8 *) msg->hdr; 394 len[0] = 1 + 1 + 2; 395 addr[1] = req_authenticator; 396 len[1] = MD5_MAC_LEN; 397 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr); 398 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 399 addr[3] = secret; 400 len[3] = secret_len; 401 md5_vector(4, addr, len, msg->hdr->authenticator); 402 403 if (wpabuf_len(msg->buf) > 0xffff) { 404 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)", 405 (unsigned long) wpabuf_len(msg->buf)); 406 return -1; 407 } 408 return 0; 409} 410 411 412int radius_msg_finish_das_resp(struct radius_msg *msg, const u8 *secret, 413 size_t secret_len, 414 const struct radius_hdr *req_hdr) 415{ 416 const u8 *addr[2]; 417 size_t len[2]; 418 u8 auth[MD5_MAC_LEN]; 419 struct radius_attr_hdr *attr; 420 421 os_memset(auth, 0, MD5_MAC_LEN); 422 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 423 auth, MD5_MAC_LEN); 424 if (attr == NULL) { 425 wpa_printf(MSG_WARNING, "Could not add Message-Authenticator"); 426 return -1; 427 } 428 429 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 430 os_memcpy(msg->hdr->authenticator, req_hdr->authenticator, 16); 431 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 432 wpabuf_len(msg->buf), (u8 *) (attr + 1)); 433 434 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */ 435 addr[0] = wpabuf_head_u8(msg->buf); 436 len[0] = wpabuf_len(msg->buf); 437 addr[1] = secret; 438 len[1] = secret_len; 439 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0) 440 return -1; 441 442 if (wpabuf_len(msg->buf) > 0xffff) { 443 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)", 444 (unsigned long) wpabuf_len(msg->buf)); 445 return -1; 446 } 447 return 0; 448} 449 450 451void radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret, 452 size_t secret_len) 453{ 454 const u8 *addr[2]; 455 size_t len[2]; 456 457 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 458 os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN); 459 addr[0] = wpabuf_head(msg->buf); 460 len[0] = wpabuf_len(msg->buf); 461 addr[1] = secret; 462 len[1] = secret_len; 463 md5_vector(2, addr, len, msg->hdr->authenticator); 464 465 if (wpabuf_len(msg->buf) > 0xffff) { 466 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)", 467 (unsigned long) wpabuf_len(msg->buf)); 468 } 469} 470 471 472void radius_msg_finish_acct_resp(struct radius_msg *msg, const u8 *secret, 473 size_t secret_len, const u8 *req_authenticator) 474{ 475 const u8 *addr[2]; 476 size_t len[2]; 477 478 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 479 os_memcpy(msg->hdr->authenticator, req_authenticator, MD5_MAC_LEN); 480 addr[0] = wpabuf_head(msg->buf); 481 len[0] = wpabuf_len(msg->buf); 482 addr[1] = secret; 483 len[1] = secret_len; 484 md5_vector(2, addr, len, msg->hdr->authenticator); 485 486 if (wpabuf_len(msg->buf) > 0xffff) { 487 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)", 488 (unsigned long) wpabuf_len(msg->buf)); 489 } 490} 491 492 493int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret, 494 size_t secret_len) 495{ 496 const u8 *addr[4]; 497 size_t len[4]; 498 u8 zero[MD5_MAC_LEN]; 499 u8 hash[MD5_MAC_LEN]; 500 501 os_memset(zero, 0, sizeof(zero)); 502 addr[0] = (u8 *) msg->hdr; 503 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN; 504 addr[1] = zero; 505 len[1] = MD5_MAC_LEN; 506 addr[2] = (u8 *) (msg->hdr + 1); 507 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 508 addr[3] = secret; 509 len[3] = secret_len; 510 md5_vector(4, addr, len, hash); 511 return os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0; 512} 513 514 515int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret, 516 size_t secret_len) 517{ 518 const u8 *addr[4]; 519 size_t len[4]; 520 u8 zero[MD5_MAC_LEN]; 521 u8 hash[MD5_MAC_LEN]; 522 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN]; 523 u8 orig_authenticator[16]; 524 525 struct radius_attr_hdr *attr = NULL, *tmp; 526 size_t i; 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 if (os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0) 539 return 1; 540 541 for (i = 0; i < msg->attr_used; i++) { 542 tmp = radius_get_attr_hdr(msg, i); 543 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) { 544 if (attr != NULL) { 545 wpa_printf(MSG_WARNING, "Multiple " 546 "Message-Authenticator attributes " 547 "in RADIUS message"); 548 return 1; 549 } 550 attr = tmp; 551 } 552 } 553 554 if (attr == NULL) { 555 /* Message-Authenticator is MAY; not required */ 556 return 0; 557 } 558 559 os_memcpy(orig, attr + 1, MD5_MAC_LEN); 560 os_memset(attr + 1, 0, MD5_MAC_LEN); 561 os_memcpy(orig_authenticator, msg->hdr->authenticator, 562 sizeof(orig_authenticator)); 563 os_memset(msg->hdr->authenticator, 0, 564 sizeof(msg->hdr->authenticator)); 565 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 566 wpabuf_len(msg->buf), auth); 567 os_memcpy(attr + 1, orig, MD5_MAC_LEN); 568 os_memcpy(msg->hdr->authenticator, orig_authenticator, 569 sizeof(orig_authenticator)); 570 571 return os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0; 572} 573 574 575static int radius_msg_add_attr_to_array(struct radius_msg *msg, 576 struct radius_attr_hdr *attr) 577{ 578 if (msg->attr_used >= msg->attr_size) { 579 size_t *nattr_pos; 580 int nlen = msg->attr_size * 2; 581 582 nattr_pos = os_realloc_array(msg->attr_pos, nlen, 583 sizeof(*msg->attr_pos)); 584 if (nattr_pos == NULL) 585 return -1; 586 587 msg->attr_pos = nattr_pos; 588 msg->attr_size = nlen; 589 } 590 591 msg->attr_pos[msg->attr_used++] = 592 (unsigned char *) attr - wpabuf_head_u8(msg->buf); 593 594 return 0; 595} 596 597 598struct radius_attr_hdr *radius_msg_add_attr(struct radius_msg *msg, u8 type, 599 const u8 *data, size_t data_len) 600{ 601 size_t buf_needed; 602 struct radius_attr_hdr *attr; 603 604 if (data_len > RADIUS_MAX_ATTR_LEN) { 605 wpa_printf(MSG_ERROR, "radius_msg_add_attr: too long attribute (%lu bytes)", 606 (unsigned long) data_len); 607 return NULL; 608 } 609 610 buf_needed = sizeof(*attr) + data_len; 611 612 if (wpabuf_tailroom(msg->buf) < buf_needed) { 613 /* allocate more space for message buffer */ 614 if (wpabuf_resize(&msg->buf, buf_needed) < 0) 615 return NULL; 616 msg->hdr = wpabuf_mhead(msg->buf); 617 } 618 619 attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr)); 620 attr->type = type; 621 attr->length = sizeof(*attr) + data_len; 622 wpabuf_put_data(msg->buf, data, data_len); 623 624 if (radius_msg_add_attr_to_array(msg, attr)) 625 return NULL; 626 627 return attr; 628} 629 630 631/** 632 * radius_msg_parse - Parse a RADIUS message 633 * @data: RADIUS message to be parsed 634 * @len: Length of data buffer in octets 635 * Returns: Parsed RADIUS message or %NULL on failure 636 * 637 * This parses a RADIUS message and makes a copy of its data. The caller is 638 * responsible for freeing the returned data with radius_msg_free(). 639 */ 640struct radius_msg * radius_msg_parse(const u8 *data, size_t len) 641{ 642 struct radius_msg *msg; 643 struct radius_hdr *hdr; 644 struct radius_attr_hdr *attr; 645 size_t msg_len; 646 unsigned char *pos, *end; 647 648 if (data == NULL || len < sizeof(*hdr)) 649 return NULL; 650 651 hdr = (struct radius_hdr *) data; 652 653 msg_len = be_to_host16(hdr->length); 654 if (msg_len < sizeof(*hdr) || msg_len > len) { 655 wpa_printf(MSG_INFO, "RADIUS: Invalid message length"); 656 return NULL; 657 } 658 659 if (msg_len < len) { 660 wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after " 661 "RADIUS message", (unsigned long) len - msg_len); 662 } 663 664 msg = os_zalloc(sizeof(*msg)); 665 if (msg == NULL) 666 return NULL; 667 668 msg->buf = wpabuf_alloc_copy(data, msg_len); 669 if (msg->buf == NULL || radius_msg_initialize(msg)) { 670 radius_msg_free(msg); 671 return NULL; 672 } 673 msg->hdr = wpabuf_mhead(msg->buf); 674 675 /* parse attributes */ 676 pos = wpabuf_mhead_u8(msg->buf) + sizeof(struct radius_hdr); 677 end = wpabuf_mhead_u8(msg->buf) + wpabuf_len(msg->buf); 678 while (pos < end) { 679 if ((size_t) (end - pos) < sizeof(*attr)) 680 goto fail; 681 682 attr = (struct radius_attr_hdr *) pos; 683 684 if (pos + attr->length > end || attr->length < sizeof(*attr)) 685 goto fail; 686 687 /* TODO: check that attr->length is suitable for attr->type */ 688 689 if (radius_msg_add_attr_to_array(msg, attr)) 690 goto fail; 691 692 pos += attr->length; 693 } 694 695 return msg; 696 697 fail: 698 radius_msg_free(msg); 699 return NULL; 700} 701 702 703int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len) 704{ 705 const u8 *pos = data; 706 size_t left = data_len; 707 708 while (left > 0) { 709 int len; 710 if (left > RADIUS_MAX_ATTR_LEN) 711 len = RADIUS_MAX_ATTR_LEN; 712 else 713 len = left; 714 715 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE, 716 pos, len)) 717 return 0; 718 719 pos += len; 720 left -= len; 721 } 722 723 return 1; 724} 725 726 727struct wpabuf * radius_msg_get_eap(struct radius_msg *msg) 728{ 729 struct wpabuf *eap; 730 size_t len, i; 731 struct radius_attr_hdr *attr; 732 733 if (msg == NULL) 734 return NULL; 735 736 len = 0; 737 for (i = 0; i < msg->attr_used; i++) { 738 attr = radius_get_attr_hdr(msg, i); 739 if (attr->type == RADIUS_ATTR_EAP_MESSAGE && 740 attr->length > sizeof(struct radius_attr_hdr)) 741 len += attr->length - sizeof(struct radius_attr_hdr); 742 } 743 744 if (len == 0) 745 return NULL; 746 747 eap = wpabuf_alloc(len); 748 if (eap == NULL) 749 return NULL; 750 751 for (i = 0; i < msg->attr_used; i++) { 752 attr = radius_get_attr_hdr(msg, i); 753 if (attr->type == RADIUS_ATTR_EAP_MESSAGE && 754 attr->length > sizeof(struct radius_attr_hdr)) { 755 int flen = attr->length - sizeof(*attr); 756 wpabuf_put_data(eap, attr + 1, flen); 757 } 758 } 759 760 return eap; 761} 762 763 764int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret, 765 size_t secret_len, const u8 *req_auth) 766{ 767 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN]; 768 u8 orig_authenticator[16]; 769 struct radius_attr_hdr *attr = NULL, *tmp; 770 size_t i; 771 772 for (i = 0; i < msg->attr_used; i++) { 773 tmp = radius_get_attr_hdr(msg, i); 774 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) { 775 if (attr != NULL) { 776 wpa_printf(MSG_INFO, "Multiple Message-Authenticator attributes in RADIUS message"); 777 return 1; 778 } 779 attr = tmp; 780 } 781 } 782 783 if (attr == NULL) { 784 wpa_printf(MSG_INFO, "No Message-Authenticator attribute found"); 785 return 1; 786 } 787 788 os_memcpy(orig, attr + 1, MD5_MAC_LEN); 789 os_memset(attr + 1, 0, MD5_MAC_LEN); 790 if (req_auth) { 791 os_memcpy(orig_authenticator, msg->hdr->authenticator, 792 sizeof(orig_authenticator)); 793 os_memcpy(msg->hdr->authenticator, req_auth, 794 sizeof(msg->hdr->authenticator)); 795 } 796 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 797 wpabuf_len(msg->buf), auth); 798 os_memcpy(attr + 1, orig, MD5_MAC_LEN); 799 if (req_auth) { 800 os_memcpy(msg->hdr->authenticator, orig_authenticator, 801 sizeof(orig_authenticator)); 802 } 803 804 if (os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0) { 805 wpa_printf(MSG_INFO, "Invalid Message-Authenticator!"); 806 return 1; 807 } 808 809 return 0; 810} 811 812 813int radius_msg_verify(struct radius_msg *msg, const u8 *secret, 814 size_t secret_len, struct radius_msg *sent_msg, int auth) 815{ 816 const u8 *addr[4]; 817 size_t len[4]; 818 u8 hash[MD5_MAC_LEN]; 819 820 if (sent_msg == NULL) { 821 wpa_printf(MSG_INFO, "No matching Access-Request message found"); 822 return 1; 823 } 824 825 if (auth && 826 radius_msg_verify_msg_auth(msg, secret, secret_len, 827 sent_msg->hdr->authenticator)) { 828 return 1; 829 } 830 831 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */ 832 addr[0] = (u8 *) msg->hdr; 833 len[0] = 1 + 1 + 2; 834 addr[1] = sent_msg->hdr->authenticator; 835 len[1] = MD5_MAC_LEN; 836 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr); 837 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 838 addr[3] = secret; 839 len[3] = secret_len; 840 md5_vector(4, addr, len, hash); 841 if (os_memcmp_const(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) { 842 wpa_printf(MSG_INFO, "Response Authenticator invalid!"); 843 return 1; 844 } 845 846 return 0; 847} 848 849 850int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src, 851 u8 type) 852{ 853 struct radius_attr_hdr *attr; 854 size_t i; 855 int count = 0; 856 857 for (i = 0; i < src->attr_used; i++) { 858 attr = radius_get_attr_hdr(src, i); 859 if (attr->type == type && attr->length >= sizeof(*attr)) { 860 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1), 861 attr->length - sizeof(*attr))) 862 return -1; 863 count++; 864 } 865 } 866 867 return count; 868} 869 870 871/* Create Request Authenticator. The value should be unique over the lifetime 872 * of the shared secret between authenticator and authentication server. 873 * Use one-way MD5 hash calculated from current timestamp and some data given 874 * by the caller. */ 875void radius_msg_make_authenticator(struct radius_msg *msg, 876 const u8 *data, size_t len) 877{ 878 struct os_time tv; 879 long int l; 880 const u8 *addr[3]; 881 size_t elen[3]; 882 883 os_get_time(&tv); 884 l = os_random(); 885 addr[0] = (u8 *) &tv; 886 elen[0] = sizeof(tv); 887 addr[1] = data; 888 elen[1] = len; 889 addr[2] = (u8 *) &l; 890 elen[2] = sizeof(l); 891 md5_vector(3, addr, elen, msg->hdr->authenticator); 892} 893 894 895/* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message. 896 * Returns the Attribute payload and sets alen to indicate the length of the 897 * payload if a vendor attribute with subtype is found, otherwise returns NULL. 898 * The returned payload is allocated with os_malloc() and caller must free it 899 * by calling os_free(). 900 */ 901static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor, 902 u8 subtype, size_t *alen) 903{ 904 u8 *data, *pos; 905 size_t i, len; 906 907 if (msg == NULL) 908 return NULL; 909 910 for (i = 0; i < msg->attr_used; i++) { 911 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i); 912 size_t left; 913 u32 vendor_id; 914 struct radius_attr_vendor *vhdr; 915 916 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC || 917 attr->length < sizeof(*attr)) 918 continue; 919 920 left = attr->length - sizeof(*attr); 921 if (left < 4) 922 continue; 923 924 pos = (u8 *) (attr + 1); 925 926 os_memcpy(&vendor_id, pos, 4); 927 pos += 4; 928 left -= 4; 929 930 if (ntohl(vendor_id) != vendor) 931 continue; 932 933 while (left >= sizeof(*vhdr)) { 934 vhdr = (struct radius_attr_vendor *) pos; 935 if (vhdr->vendor_length > left || 936 vhdr->vendor_length < sizeof(*vhdr)) { 937 left = 0; 938 break; 939 } 940 if (vhdr->vendor_type != subtype) { 941 pos += vhdr->vendor_length; 942 left -= vhdr->vendor_length; 943 continue; 944 } 945 946 len = vhdr->vendor_length - sizeof(*vhdr); 947 data = os_malloc(len); 948 if (data == NULL) 949 return NULL; 950 os_memcpy(data, pos + sizeof(*vhdr), len); 951 if (alen) 952 *alen = len; 953 return data; 954 } 955 } 956 957 return NULL; 958} 959 960 961static u8 * decrypt_ms_key(const u8 *key, size_t len, 962 const u8 *req_authenticator, 963 const u8 *secret, size_t secret_len, size_t *reslen) 964{ 965 u8 *plain, *ppos, *res; 966 const u8 *pos; 967 size_t left, plen; 968 u8 hash[MD5_MAC_LEN]; 969 int i, first = 1; 970 const u8 *addr[3]; 971 size_t elen[3]; 972 973 /* key: 16-bit salt followed by encrypted key info */ 974 975 if (len < 2 + 16) 976 return NULL; 977 978 pos = key + 2; 979 left = len - 2; 980 if (left % 16) { 981 wpa_printf(MSG_INFO, "Invalid ms key len %lu", 982 (unsigned long) left); 983 return NULL; 984 } 985 986 plen = left; 987 ppos = plain = os_malloc(plen); 988 if (plain == NULL) 989 return NULL; 990 plain[0] = 0; 991 992 while (left > 0) { 993 /* b(1) = MD5(Secret + Request-Authenticator + Salt) 994 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */ 995 996 addr[0] = secret; 997 elen[0] = secret_len; 998 if (first) { 999 addr[1] = req_authenticator; 1000 elen[1] = MD5_MAC_LEN; 1001 addr[2] = key; 1002 elen[2] = 2; /* Salt */ 1003 } else { 1004 addr[1] = pos - MD5_MAC_LEN; 1005 elen[1] = MD5_MAC_LEN; 1006 } 1007 md5_vector(first ? 3 : 2, addr, elen, hash); 1008 first = 0; 1009 1010 for (i = 0; i < MD5_MAC_LEN; i++) 1011 *ppos++ = *pos++ ^ hash[i]; 1012 left -= MD5_MAC_LEN; 1013 } 1014 1015 if (plain[0] == 0 || plain[0] > plen - 1) { 1016 wpa_printf(MSG_INFO, "Failed to decrypt MPPE key"); 1017 os_free(plain); 1018 return NULL; 1019 } 1020 1021 res = os_malloc(plain[0]); 1022 if (res == NULL) { 1023 os_free(plain); 1024 return NULL; 1025 } 1026 os_memcpy(res, plain + 1, plain[0]); 1027 if (reslen) 1028 *reslen = plain[0]; 1029 os_free(plain); 1030 return res; 1031} 1032 1033 1034static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt, 1035 const u8 *req_authenticator, 1036 const u8 *secret, size_t secret_len, 1037 u8 *ebuf, size_t *elen) 1038{ 1039 int i, len, first = 1; 1040 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos; 1041 const u8 *addr[3]; 1042 size_t _len[3]; 1043 1044 WPA_PUT_BE16(saltbuf, salt); 1045 1046 len = 1 + key_len; 1047 if (len & 0x0f) { 1048 len = (len & 0xf0) + 16; 1049 } 1050 os_memset(ebuf, 0, len); 1051 ebuf[0] = key_len; 1052 os_memcpy(ebuf + 1, key, key_len); 1053 1054 *elen = len; 1055 1056 pos = ebuf; 1057 while (len > 0) { 1058 /* b(1) = MD5(Secret + Request-Authenticator + Salt) 1059 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */ 1060 addr[0] = secret; 1061 _len[0] = secret_len; 1062 if (first) { 1063 addr[1] = req_authenticator; 1064 _len[1] = MD5_MAC_LEN; 1065 addr[2] = saltbuf; 1066 _len[2] = sizeof(saltbuf); 1067 } else { 1068 addr[1] = pos - MD5_MAC_LEN; 1069 _len[1] = MD5_MAC_LEN; 1070 } 1071 md5_vector(first ? 3 : 2, addr, _len, hash); 1072 first = 0; 1073 1074 for (i = 0; i < MD5_MAC_LEN; i++) 1075 *pos++ ^= hash[i]; 1076 1077 len -= MD5_MAC_LEN; 1078 } 1079} 1080 1081 1082struct radius_ms_mppe_keys * 1083radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg, 1084 const u8 *secret, size_t secret_len) 1085{ 1086 u8 *key; 1087 size_t keylen; 1088 struct radius_ms_mppe_keys *keys; 1089 1090 if (msg == NULL || sent_msg == NULL) 1091 return NULL; 1092 1093 keys = os_zalloc(sizeof(*keys)); 1094 if (keys == NULL) 1095 return NULL; 1096 1097 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT, 1098 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY, 1099 &keylen); 1100 if (key) { 1101 keys->send = decrypt_ms_key(key, keylen, 1102 sent_msg->hdr->authenticator, 1103 secret, secret_len, 1104 &keys->send_len); 1105 os_free(key); 1106 } 1107 1108 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT, 1109 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY, 1110 &keylen); 1111 if (key) { 1112 keys->recv = decrypt_ms_key(key, keylen, 1113 sent_msg->hdr->authenticator, 1114 secret, secret_len, 1115 &keys->recv_len); 1116 os_free(key); 1117 } 1118 1119 return keys; 1120} 1121 1122 1123struct radius_ms_mppe_keys * 1124radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg, 1125 const u8 *secret, size_t secret_len) 1126{ 1127 u8 *key; 1128 size_t keylen; 1129 struct radius_ms_mppe_keys *keys; 1130 1131 if (msg == NULL || sent_msg == NULL) 1132 return NULL; 1133 1134 keys = os_zalloc(sizeof(*keys)); 1135 if (keys == NULL) 1136 return NULL; 1137 1138 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO, 1139 RADIUS_CISCO_AV_PAIR, &keylen); 1140 if (key && keylen == 51 && 1141 os_memcmp(key, "leap:session-key=", 17) == 0) { 1142 keys->recv = decrypt_ms_key(key + 17, keylen - 17, 1143 sent_msg->hdr->authenticator, 1144 secret, secret_len, 1145 &keys->recv_len); 1146 } 1147 os_free(key); 1148 1149 return keys; 1150} 1151 1152 1153int radius_msg_add_mppe_keys(struct radius_msg *msg, 1154 const u8 *req_authenticator, 1155 const u8 *secret, size_t secret_len, 1156 const u8 *send_key, size_t send_key_len, 1157 const u8 *recv_key, size_t recv_key_len) 1158{ 1159 struct radius_attr_hdr *attr; 1160 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT); 1161 u8 *buf; 1162 struct radius_attr_vendor *vhdr; 1163 u8 *pos; 1164 size_t elen; 1165 int hlen; 1166 u16 salt; 1167 1168 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2; 1169 1170 /* MS-MPPE-Send-Key */ 1171 buf = os_malloc(hlen + send_key_len + 16); 1172 if (buf == NULL) { 1173 return 0; 1174 } 1175 pos = buf; 1176 os_memcpy(pos, &vendor_id, sizeof(vendor_id)); 1177 pos += sizeof(vendor_id); 1178 vhdr = (struct radius_attr_vendor *) pos; 1179 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY; 1180 pos = (u8 *) (vhdr + 1); 1181 salt = os_random() | 0x8000; 1182 WPA_PUT_BE16(pos, salt); 1183 pos += 2; 1184 encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret, 1185 secret_len, pos, &elen); 1186 vhdr->vendor_length = hlen + elen - sizeof(vendor_id); 1187 1188 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC, 1189 buf, hlen + elen); 1190 os_free(buf); 1191 if (attr == NULL) { 1192 return 0; 1193 } 1194 1195 /* MS-MPPE-Recv-Key */ 1196 buf = os_malloc(hlen + send_key_len + 16); 1197 if (buf == NULL) { 1198 return 0; 1199 } 1200 pos = buf; 1201 os_memcpy(pos, &vendor_id, sizeof(vendor_id)); 1202 pos += sizeof(vendor_id); 1203 vhdr = (struct radius_attr_vendor *) pos; 1204 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY; 1205 pos = (u8 *) (vhdr + 1); 1206 salt ^= 1; 1207 WPA_PUT_BE16(pos, salt); 1208 pos += 2; 1209 encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret, 1210 secret_len, pos, &elen); 1211 vhdr->vendor_length = hlen + elen - sizeof(vendor_id); 1212 1213 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC, 1214 buf, hlen + elen); 1215 os_free(buf); 1216 if (attr == NULL) { 1217 return 0; 1218 } 1219 1220 return 1; 1221} 1222 1223 1224int radius_msg_add_wfa(struct radius_msg *msg, u8 subtype, const u8 *data, 1225 size_t len) 1226{ 1227 struct radius_attr_hdr *attr; 1228 u8 *buf, *pos; 1229 size_t alen; 1230 1231 alen = 4 + 2 + len; 1232 buf = os_malloc(alen); 1233 if (buf == NULL) 1234 return 0; 1235 pos = buf; 1236 WPA_PUT_BE32(pos, RADIUS_VENDOR_ID_WFA); 1237 pos += 4; 1238 *pos++ = subtype; 1239 *pos++ = 2 + len; 1240 os_memcpy(pos, data, len); 1241 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC, 1242 buf, alen); 1243 os_free(buf); 1244 if (attr == NULL) 1245 return 0; 1246 1247 return 1; 1248} 1249 1250 1251int radius_user_password_hide(struct radius_msg *msg, 1252 const u8 *data, size_t data_len, 1253 const u8 *secret, size_t secret_len, 1254 u8 *buf, size_t buf_len) 1255{ 1256 size_t padlen, i, pos; 1257 const u8 *addr[2]; 1258 size_t len[2]; 1259 u8 hash[16]; 1260 1261 if (data_len + 16 > buf_len) 1262 return -1; 1263 1264 os_memcpy(buf, data, data_len); 1265 1266 padlen = data_len % 16; 1267 if (padlen && data_len < buf_len) { 1268 padlen = 16 - padlen; 1269 os_memset(buf + data_len, 0, padlen); 1270 buf_len = data_len + padlen; 1271 } else { 1272 buf_len = data_len; 1273 } 1274 1275 addr[0] = secret; 1276 len[0] = secret_len; 1277 addr[1] = msg->hdr->authenticator; 1278 len[1] = 16; 1279 md5_vector(2, addr, len, hash); 1280 1281 for (i = 0; i < 16; i++) 1282 buf[i] ^= hash[i]; 1283 pos = 16; 1284 1285 while (pos < buf_len) { 1286 addr[0] = secret; 1287 len[0] = secret_len; 1288 addr[1] = &buf[pos - 16]; 1289 len[1] = 16; 1290 md5_vector(2, addr, len, hash); 1291 1292 for (i = 0; i < 16; i++) 1293 buf[pos + i] ^= hash[i]; 1294 1295 pos += 16; 1296 } 1297 1298 return buf_len; 1299} 1300 1301 1302/* Add User-Password attribute to a RADIUS message and encrypt it as specified 1303 * in RFC 2865, Chap. 5.2 */ 1304struct radius_attr_hdr * 1305radius_msg_add_attr_user_password(struct radius_msg *msg, 1306 const u8 *data, size_t data_len, 1307 const u8 *secret, size_t secret_len) 1308{ 1309 u8 buf[128]; 1310 int res; 1311 1312 res = radius_user_password_hide(msg, data, data_len, 1313 secret, secret_len, buf, sizeof(buf)); 1314 if (res < 0) 1315 return NULL; 1316 1317 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD, 1318 buf, res); 1319} 1320 1321 1322int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len) 1323{ 1324 struct radius_attr_hdr *attr = NULL, *tmp; 1325 size_t i, dlen; 1326 1327 for (i = 0; i < msg->attr_used; i++) { 1328 tmp = radius_get_attr_hdr(msg, i); 1329 if (tmp->type == type) { 1330 attr = tmp; 1331 break; 1332 } 1333 } 1334 1335 if (!attr || attr->length < sizeof(*attr)) 1336 return -1; 1337 1338 dlen = attr->length - sizeof(*attr); 1339 if (buf) 1340 os_memcpy(buf, (attr + 1), dlen > len ? len : dlen); 1341 return dlen; 1342} 1343 1344 1345int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf, 1346 size_t *len, const u8 *start) 1347{ 1348 size_t i; 1349 struct radius_attr_hdr *attr = NULL, *tmp; 1350 1351 for (i = 0; i < msg->attr_used; i++) { 1352 tmp = radius_get_attr_hdr(msg, i); 1353 if (tmp->type == type && 1354 (start == NULL || (u8 *) tmp > start)) { 1355 attr = tmp; 1356 break; 1357 } 1358 } 1359 1360 if (!attr || attr->length < sizeof(*attr)) 1361 return -1; 1362 1363 *buf = (u8 *) (attr + 1); 1364 *len = attr->length - sizeof(*attr); 1365 return 0; 1366} 1367 1368 1369int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len) 1370{ 1371 size_t i; 1372 int count; 1373 1374 for (count = 0, i = 0; i < msg->attr_used; i++) { 1375 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i); 1376 if (attr->type == type && 1377 attr->length >= sizeof(struct radius_attr_hdr) + min_len) 1378 count++; 1379 } 1380 1381 return count; 1382} 1383 1384 1385struct radius_tunnel_attrs { 1386 int tag_used; 1387 int type; /* Tunnel-Type */ 1388 int medium_type; /* Tunnel-Medium-Type */ 1389 int vlanid; 1390}; 1391 1392 1393/** 1394 * radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information 1395 * @msg: RADIUS message 1396 * Returns: VLAN ID for the first tunnel configuration of -1 if none is found 1397 */ 1398int radius_msg_get_vlanid(struct radius_msg *msg) 1399{ 1400 struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun; 1401 size_t i; 1402 struct radius_attr_hdr *attr = NULL; 1403 const u8 *data; 1404 char buf[10]; 1405 size_t dlen; 1406 1407 os_memset(&tunnel, 0, sizeof(tunnel)); 1408 1409 for (i = 0; i < msg->attr_used; i++) { 1410 attr = radius_get_attr_hdr(msg, i); 1411 if (attr->length < sizeof(*attr)) 1412 return -1; 1413 data = (const u8 *) (attr + 1); 1414 dlen = attr->length - sizeof(*attr); 1415 if (attr->length < 3) 1416 continue; 1417 if (data[0] >= RADIUS_TUNNEL_TAGS) 1418 tun = &tunnel[0]; 1419 else 1420 tun = &tunnel[data[0]]; 1421 1422 switch (attr->type) { 1423 case RADIUS_ATTR_TUNNEL_TYPE: 1424 if (attr->length != 6) 1425 break; 1426 tun->tag_used++; 1427 tun->type = WPA_GET_BE24(data + 1); 1428 break; 1429 case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE: 1430 if (attr->length != 6) 1431 break; 1432 tun->tag_used++; 1433 tun->medium_type = WPA_GET_BE24(data + 1); 1434 break; 1435 case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID: 1436 if (data[0] < RADIUS_TUNNEL_TAGS) { 1437 data++; 1438 dlen--; 1439 } 1440 if (dlen >= sizeof(buf)) 1441 break; 1442 os_memcpy(buf, data, dlen); 1443 buf[dlen] = '\0'; 1444 tun->tag_used++; 1445 tun->vlanid = atoi(buf); 1446 break; 1447 } 1448 } 1449 1450 for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) { 1451 tun = &tunnel[i]; 1452 if (tun->tag_used && 1453 tun->type == RADIUS_TUNNEL_TYPE_VLAN && 1454 tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 && 1455 tun->vlanid > 0) 1456 return tun->vlanid; 1457 } 1458 1459 return -1; 1460} 1461 1462 1463/** 1464 * radius_msg_get_tunnel_password - Parse RADIUS attribute Tunnel-Password 1465 * @msg: Received RADIUS message 1466 * @keylen: Length of returned password 1467 * @secret: RADIUS shared secret 1468 * @secret_len: Length of secret 1469 * @sent_msg: Sent RADIUS message 1470 * @n: Number of password attribute to return (starting with 0) 1471 * Returns: Pointer to n-th password (free with os_free) or %NULL 1472 */ 1473char * radius_msg_get_tunnel_password(struct radius_msg *msg, int *keylen, 1474 const u8 *secret, size_t secret_len, 1475 struct radius_msg *sent_msg, size_t n) 1476{ 1477 u8 *buf = NULL; 1478 size_t buflen; 1479 const u8 *salt; 1480 u8 *str; 1481 const u8 *addr[3]; 1482 size_t len[3]; 1483 u8 hash[16]; 1484 u8 *pos; 1485 size_t i, j = 0; 1486 struct radius_attr_hdr *attr; 1487 const u8 *data; 1488 size_t dlen; 1489 const u8 *fdata = NULL; /* points to found item */ 1490 size_t fdlen = -1; 1491 char *ret = NULL; 1492 1493 /* find n-th valid Tunnel-Password attribute */ 1494 for (i = 0; i < msg->attr_used; i++) { 1495 attr = radius_get_attr_hdr(msg, i); 1496 if (attr == NULL || 1497 attr->type != RADIUS_ATTR_TUNNEL_PASSWORD) { 1498 continue; 1499 } 1500 if (attr->length <= 5) 1501 continue; 1502 data = (const u8 *) (attr + 1); 1503 dlen = attr->length - sizeof(*attr); 1504 if (dlen <= 3 || dlen % 16 != 3) 1505 continue; 1506 j++; 1507 if (j <= n) 1508 continue; 1509 1510 fdata = data; 1511 fdlen = dlen; 1512 break; 1513 } 1514 if (fdata == NULL) 1515 goto out; 1516 1517 /* alloc writable memory for decryption */ 1518 buf = os_malloc(fdlen); 1519 if (buf == NULL) 1520 goto out; 1521 os_memcpy(buf, fdata, fdlen); 1522 buflen = fdlen; 1523 1524 /* init pointers */ 1525 salt = buf + 1; 1526 str = buf + 3; 1527 1528 /* decrypt blocks */ 1529 pos = buf + buflen - 16; /* last block */ 1530 while (pos >= str + 16) { /* all but the first block */ 1531 addr[0] = secret; 1532 len[0] = secret_len; 1533 addr[1] = pos - 16; 1534 len[1] = 16; 1535 md5_vector(2, addr, len, hash); 1536 1537 for (i = 0; i < 16; i++) 1538 pos[i] ^= hash[i]; 1539 1540 pos -= 16; 1541 } 1542 1543 /* decrypt first block */ 1544 if (str != pos) 1545 goto out; 1546 addr[0] = secret; 1547 len[0] = secret_len; 1548 addr[1] = sent_msg->hdr->authenticator; 1549 len[1] = 16; 1550 addr[2] = salt; 1551 len[2] = 2; 1552 md5_vector(3, addr, len, hash); 1553 1554 for (i = 0; i < 16; i++) 1555 pos[i] ^= hash[i]; 1556 1557 /* derive plaintext length from first subfield */ 1558 *keylen = (unsigned char) str[0]; 1559 if ((u8 *) (str + *keylen) >= (u8 *) (buf + buflen)) { 1560 /* decryption error - invalid key length */ 1561 goto out; 1562 } 1563 if (*keylen == 0) { 1564 /* empty password */ 1565 goto out; 1566 } 1567 1568 /* copy passphrase into new buffer */ 1569 ret = os_malloc(*keylen); 1570 if (ret) 1571 os_memcpy(ret, str + 1, *keylen); 1572 1573out: 1574 /* return new buffer */ 1575 os_free(buf); 1576 return ret; 1577} 1578 1579 1580void radius_free_class(struct radius_class_data *c) 1581{ 1582 size_t i; 1583 if (c == NULL) 1584 return; 1585 for (i = 0; i < c->count; i++) 1586 os_free(c->attr[i].data); 1587 os_free(c->attr); 1588 c->attr = NULL; 1589 c->count = 0; 1590} 1591 1592 1593int radius_copy_class(struct radius_class_data *dst, 1594 const struct radius_class_data *src) 1595{ 1596 size_t i; 1597 1598 if (src->attr == NULL) 1599 return 0; 1600 1601 dst->attr = os_calloc(src->count, sizeof(struct radius_attr_data)); 1602 if (dst->attr == NULL) 1603 return -1; 1604 1605 dst->count = 0; 1606 1607 for (i = 0; i < src->count; i++) { 1608 dst->attr[i].data = os_malloc(src->attr[i].len); 1609 if (dst->attr[i].data == NULL) 1610 break; 1611 dst->count++; 1612 os_memcpy(dst->attr[i].data, src->attr[i].data, 1613 src->attr[i].len); 1614 dst->attr[i].len = src->attr[i].len; 1615 } 1616 1617 return 0; 1618} 1619 1620 1621u8 radius_msg_find_unlisted_attr(struct radius_msg *msg, u8 *attrs) 1622{ 1623 size_t i, j; 1624 struct radius_attr_hdr *attr; 1625 1626 for (i = 0; i < msg->attr_used; i++) { 1627 attr = radius_get_attr_hdr(msg, i); 1628 1629 for (j = 0; attrs[j]; j++) { 1630 if (attr->type == attrs[j]) 1631 break; 1632 } 1633 1634 if (attrs[j] == 0) 1635 return attr->type; /* unlisted attr */ 1636 } 1637 1638 return 0; 1639} 1640