1 /* 2 * RADIUS message processing 3 * Copyright (c) 2002-2009, 2011-2022, 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 u16 type; /* 0..255 for basic types; 163 * (241 << 8) | <ext-type> for extended types */ 164 char *name; 165 enum { 166 RADIUS_ATTR_UNDIST, RADIUS_ATTR_TEXT, RADIUS_ATTR_IP, 167 RADIUS_ATTR_HEXDUMP, RADIUS_ATTR_INT32, RADIUS_ATTR_IPV6 168 } data_type; 169 }; 170 171 static const struct radius_attr_type radius_attrs[] = 172 { 173 { RADIUS_ATTR_USER_NAME, "User-Name", RADIUS_ATTR_TEXT }, 174 { RADIUS_ATTR_USER_PASSWORD, "User-Password", RADIUS_ATTR_UNDIST }, 175 { RADIUS_ATTR_NAS_IP_ADDRESS, "NAS-IP-Address", RADIUS_ATTR_IP }, 176 { RADIUS_ATTR_NAS_PORT, "NAS-Port", RADIUS_ATTR_INT32 }, 177 { RADIUS_ATTR_SERVICE_TYPE, "Service-Type", RADIUS_ATTR_INT32 }, 178 { RADIUS_ATTR_FRAMED_IP_ADDRESS, "Framed-IP-Address", RADIUS_ATTR_IP }, 179 { RADIUS_ATTR_FILTER_ID, "Filter-Id", RADIUS_ATTR_TEXT }, 180 { RADIUS_ATTR_FRAMED_MTU, "Framed-MTU", RADIUS_ATTR_INT32 }, 181 { RADIUS_ATTR_REPLY_MESSAGE, "Reply-Message", RADIUS_ATTR_TEXT }, 182 { RADIUS_ATTR_STATE, "State", RADIUS_ATTR_UNDIST }, 183 { RADIUS_ATTR_CLASS, "Class", RADIUS_ATTR_UNDIST }, 184 { RADIUS_ATTR_VENDOR_SPECIFIC, "Vendor-Specific", RADIUS_ATTR_UNDIST }, 185 { RADIUS_ATTR_SESSION_TIMEOUT, "Session-Timeout", RADIUS_ATTR_INT32 }, 186 { RADIUS_ATTR_IDLE_TIMEOUT, "Idle-Timeout", RADIUS_ATTR_INT32 }, 187 { RADIUS_ATTR_TERMINATION_ACTION, "Termination-Action", 188 RADIUS_ATTR_INT32 }, 189 { RADIUS_ATTR_CALLED_STATION_ID, "Called-Station-Id", 190 RADIUS_ATTR_TEXT }, 191 { RADIUS_ATTR_CALLING_STATION_ID, "Calling-Station-Id", 192 RADIUS_ATTR_TEXT }, 193 { RADIUS_ATTR_NAS_IDENTIFIER, "NAS-Identifier", RADIUS_ATTR_TEXT }, 194 { RADIUS_ATTR_PROXY_STATE, "Proxy-State", RADIUS_ATTR_UNDIST }, 195 { RADIUS_ATTR_ACCT_STATUS_TYPE, "Acct-Status-Type", 196 RADIUS_ATTR_INT32 }, 197 { RADIUS_ATTR_ACCT_DELAY_TIME, "Acct-Delay-Time", RADIUS_ATTR_INT32 }, 198 { RADIUS_ATTR_ACCT_INPUT_OCTETS, "Acct-Input-Octets", 199 RADIUS_ATTR_INT32 }, 200 { RADIUS_ATTR_ACCT_OUTPUT_OCTETS, "Acct-Output-Octets", 201 RADIUS_ATTR_INT32 }, 202 { RADIUS_ATTR_ACCT_SESSION_ID, "Acct-Session-Id", RADIUS_ATTR_TEXT }, 203 { RADIUS_ATTR_ACCT_AUTHENTIC, "Acct-Authentic", RADIUS_ATTR_INT32 }, 204 { RADIUS_ATTR_ACCT_SESSION_TIME, "Acct-Session-Time", 205 RADIUS_ATTR_INT32 }, 206 { RADIUS_ATTR_ACCT_INPUT_PACKETS, "Acct-Input-Packets", 207 RADIUS_ATTR_INT32 }, 208 { RADIUS_ATTR_ACCT_OUTPUT_PACKETS, "Acct-Output-Packets", 209 RADIUS_ATTR_INT32 }, 210 { RADIUS_ATTR_ACCT_TERMINATE_CAUSE, "Acct-Terminate-Cause", 211 RADIUS_ATTR_INT32 }, 212 { RADIUS_ATTR_ACCT_MULTI_SESSION_ID, "Acct-Multi-Session-Id", 213 RADIUS_ATTR_TEXT }, 214 { RADIUS_ATTR_ACCT_LINK_COUNT, "Acct-Link-Count", RADIUS_ATTR_INT32 }, 215 { RADIUS_ATTR_ACCT_INPUT_GIGAWORDS, "Acct-Input-Gigawords", 216 RADIUS_ATTR_INT32 }, 217 { RADIUS_ATTR_ACCT_OUTPUT_GIGAWORDS, "Acct-Output-Gigawords", 218 RADIUS_ATTR_INT32 }, 219 { RADIUS_ATTR_EVENT_TIMESTAMP, "Event-Timestamp", 220 RADIUS_ATTR_INT32 }, 221 { RADIUS_ATTR_EGRESS_VLANID, "EGRESS-VLANID", RADIUS_ATTR_HEXDUMP }, 222 { RADIUS_ATTR_NAS_PORT_TYPE, "NAS-Port-Type", RADIUS_ATTR_INT32 }, 223 { RADIUS_ATTR_TUNNEL_TYPE, "Tunnel-Type", RADIUS_ATTR_HEXDUMP }, 224 { RADIUS_ATTR_TUNNEL_MEDIUM_TYPE, "Tunnel-Medium-Type", 225 RADIUS_ATTR_HEXDUMP }, 226 { RADIUS_ATTR_TUNNEL_PASSWORD, "Tunnel-Password", 227 RADIUS_ATTR_UNDIST }, 228 { RADIUS_ATTR_CONNECT_INFO, "Connect-Info", RADIUS_ATTR_TEXT }, 229 { RADIUS_ATTR_EAP_MESSAGE, "EAP-Message", RADIUS_ATTR_UNDIST }, 230 { RADIUS_ATTR_MESSAGE_AUTHENTICATOR, "Message-Authenticator", 231 RADIUS_ATTR_UNDIST }, 232 { RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID, "Tunnel-Private-Group-Id", 233 RADIUS_ATTR_HEXDUMP }, 234 { RADIUS_ATTR_ACCT_INTERIM_INTERVAL, "Acct-Interim-Interval", 235 RADIUS_ATTR_INT32 }, 236 { RADIUS_ATTR_CHARGEABLE_USER_IDENTITY, "Chargeable-User-Identity", 237 RADIUS_ATTR_TEXT }, 238 { RADIUS_ATTR_NAS_IPV6_ADDRESS, "NAS-IPv6-Address", RADIUS_ATTR_IPV6 }, 239 { RADIUS_ATTR_ERROR_CAUSE, "Error-Cause", RADIUS_ATTR_INT32 }, 240 { RADIUS_ATTR_EAP_KEY_NAME, "EAP-Key-Name", RADIUS_ATTR_HEXDUMP }, 241 { RADIUS_ATTR_OPERATOR_NAME, "Operator-Name", RADIUS_ATTR_TEXT }, 242 { RADIUS_ATTR_LOCATION_INFO, "Location-Information", 243 RADIUS_ATTR_HEXDUMP }, 244 { RADIUS_ATTR_LOCATION_DATA, "Location-Data", RADIUS_ATTR_HEXDUMP }, 245 { RADIUS_ATTR_BASIC_LOCATION_POLICY_RULES, 246 "Basic-Location-Policy-Rules", RADIUS_ATTR_HEXDUMP }, 247 { RADIUS_ATTR_EXTENDED_LOCATION_POLICY_RULES, 248 "Extended-Location-Policy-Rules", RADIUS_ATTR_HEXDUMP }, 249 { RADIUS_ATTR_LOCATION_CAPABLE, "Location-Capable", RADIUS_ATTR_INT32 }, 250 { RADIUS_ATTR_REQUESTED_LOCATION_INFO, "Requested-Location-Info", 251 RADIUS_ATTR_INT32 }, 252 { RADIUS_ATTR_MOBILITY_DOMAIN_ID, "Mobility-Domain-Id", 253 RADIUS_ATTR_INT32 }, 254 { RADIUS_ATTR_WLAN_HESSID, "WLAN-HESSID", RADIUS_ATTR_TEXT }, 255 { RADIUS_ATTR_WLAN_REASON_CODE, "WLAN-Reason-Code", 256 RADIUS_ATTR_INT32 }, 257 { RADIUS_ATTR_WLAN_PAIRWISE_CIPHER, "WLAN-Pairwise-Cipher", 258 RADIUS_ATTR_HEXDUMP }, 259 { RADIUS_ATTR_WLAN_GROUP_CIPHER, "WLAN-Group-Cipher", 260 RADIUS_ATTR_HEXDUMP }, 261 { RADIUS_ATTR_WLAN_AKM_SUITE, "WLAN-AKM-Suite", 262 RADIUS_ATTR_HEXDUMP }, 263 { RADIUS_ATTR_WLAN_GROUP_MGMT_CIPHER, "WLAN-Group-Mgmt-Pairwise-Cipher", 264 RADIUS_ATTR_HEXDUMP }, 265 { RADIUS_ATTR_EXT_TYPE_1, "Extended-Type-1", RADIUS_ATTR_UNDIST }, 266 { RADIUS_ATTR_EXT_TYPE_2, "Extended-Type-2", RADIUS_ATTR_UNDIST }, 267 { RADIUS_ATTR_EXT_TYPE_3, "Extended-Type-3", RADIUS_ATTR_UNDIST }, 268 { RADIUS_ATTR_EXT_TYPE_4, "Extended-Type-4", RADIUS_ATTR_UNDIST }, 269 { RADIUS_ATTR_LONG_EXT_TYPE_1, "Long-Extended-Type-1", 270 RADIUS_ATTR_UNDIST }, 271 { RADIUS_ATTR_LONG_EXT_TYPE_2, "Long-Extended-Type-2", 272 RADIUS_ATTR_UNDIST }, 273 { RADIUS_ATTR_EXT_VENDOR_SPECIFIC_1, "Extended-Vendor-Specific-1", 274 RADIUS_ATTR_UNDIST }, 275 { RADIUS_ATTR_EXT_VENDOR_SPECIFIC_2, "Extended-Vendor-Specific-2", 276 RADIUS_ATTR_UNDIST }, 277 { RADIUS_ATTR_EXT_VENDOR_SPECIFIC_3, "Extended-Vendor-Specific-3", 278 RADIUS_ATTR_UNDIST }, 279 { RADIUS_ATTR_EXT_VENDOR_SPECIFIC_4, "Extended-Vendor-Specific-4", 280 RADIUS_ATTR_UNDIST }, 281 { RADIUS_ATTR_EXT_VENDOR_SPECIFIC_5, "Extended-Vendor-Specific-5", 282 RADIUS_ATTR_UNDIST }, 283 { RADIUS_ATTR_EXT_VENDOR_SPECIFIC_6, "Extended-Vendor-Specific-6", 284 RADIUS_ATTR_UNDIST }, 285 }; 286 #define RADIUS_ATTRS ARRAY_SIZE(radius_attrs) 287 288 289 static const struct radius_attr_type * radius_get_attr_type(u16 type) 290 { 291 size_t i; 292 293 for (i = 0; i < RADIUS_ATTRS; i++) { 294 if (type == radius_attrs[i].type) 295 return &radius_attrs[i]; 296 } 297 298 return NULL; 299 } 300 301 302 static bool radius_is_long_ext_type(u8 type) 303 { 304 return type == RADIUS_ATTR_LONG_EXT_TYPE_1 || 305 type == RADIUS_ATTR_LONG_EXT_TYPE_2; 306 } 307 308 309 static bool radius_is_ext_type(u8 type) 310 { 311 return type >= RADIUS_ATTR_EXT_TYPE_1 && 312 type <= RADIUS_ATTR_LONG_EXT_TYPE_2; 313 } 314 315 316 static void radius_msg_dump_attr(struct radius_attr_hdr *hdr) 317 { 318 struct radius_attr_hdr_ext *ext = NULL; 319 const struct radius_attr_type *attr; 320 int len; 321 unsigned char *pos; 322 char buf[1000]; 323 324 if (hdr->length < sizeof(struct radius_attr_hdr)) 325 return; 326 327 if (radius_is_ext_type(hdr->type)) { 328 if (hdr->length < 4) { 329 wpa_printf(MSG_INFO, 330 " Invalid attribute %d (too short for extended type)", 331 hdr->type); 332 return; 333 } 334 335 ext = (struct radius_attr_hdr_ext *) hdr; 336 } 337 338 if (ext) { 339 attr = radius_get_attr_type((ext->type << 8) | ext->ext_type); 340 wpa_printf(MSG_INFO, " Attribute %d.%d (%s) length=%d", 341 ext->type, ext->ext_type, 342 attr ? attr->name : "?Unknown?", ext->length); 343 pos = (unsigned char *) (ext + 1); 344 len = ext->length - sizeof(struct radius_attr_hdr_ext); 345 } else { 346 attr = radius_get_attr_type(hdr->type); 347 wpa_printf(MSG_INFO, " Attribute %d (%s) length=%d", 348 hdr->type, attr ? attr->name : "?Unknown?", 349 hdr->length); 350 pos = (unsigned char *) (hdr + 1); 351 len = hdr->length - sizeof(struct radius_attr_hdr); 352 } 353 354 if (!attr) 355 return; 356 357 switch (attr->data_type) { 358 case RADIUS_ATTR_TEXT: 359 printf_encode(buf, sizeof(buf), pos, len); 360 wpa_printf(MSG_INFO, " Value: '%s'", buf); 361 break; 362 363 case RADIUS_ATTR_IP: 364 if (len == 4) { 365 struct in_addr addr; 366 os_memcpy(&addr, pos, 4); 367 wpa_printf(MSG_INFO, " Value: %s", 368 inet_ntoa(addr)); 369 } else { 370 wpa_printf(MSG_INFO, " Invalid IP address length %d", 371 len); 372 } 373 break; 374 375 #ifdef CONFIG_IPV6 376 case RADIUS_ATTR_IPV6: 377 if (len == 16) { 378 const char *atxt; 379 struct in6_addr *addr = (struct in6_addr *) pos; 380 atxt = inet_ntop(AF_INET6, addr, buf, sizeof(buf)); 381 wpa_printf(MSG_INFO, " Value: %s", 382 atxt ? atxt : "?"); 383 } else { 384 wpa_printf(MSG_INFO, " Invalid IPv6 address length %d", 385 len); 386 } 387 break; 388 #endif /* CONFIG_IPV6 */ 389 390 case RADIUS_ATTR_HEXDUMP: 391 case RADIUS_ATTR_UNDIST: 392 wpa_snprintf_hex(buf, sizeof(buf), pos, len); 393 wpa_printf(MSG_INFO, " Value: %s", buf); 394 break; 395 396 case RADIUS_ATTR_INT32: 397 if (len == 4) 398 wpa_printf(MSG_INFO, " Value: %u", 399 WPA_GET_BE32(pos)); 400 else 401 wpa_printf(MSG_INFO, " Invalid INT32 length %d", 402 len); 403 break; 404 405 default: 406 break; 407 } 408 } 409 410 411 void radius_msg_dump(struct radius_msg *msg) 412 { 413 size_t i; 414 415 wpa_printf(MSG_INFO, "RADIUS message: code=%d (%s) identifier=%d length=%d", 416 msg->hdr->code, radius_code_string(msg->hdr->code), 417 msg->hdr->identifier, be_to_host16(msg->hdr->length)); 418 419 for (i = 0; i < msg->attr_used; i++) { 420 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i); 421 radius_msg_dump_attr(attr); 422 } 423 } 424 425 426 u8 * radius_msg_add_msg_auth(struct radius_msg *msg) 427 { 428 u8 auth[MD5_MAC_LEN]; 429 struct radius_attr_hdr *attr; 430 431 os_memset(auth, 0, MD5_MAC_LEN); 432 attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 433 auth, MD5_MAC_LEN); 434 if (!attr) { 435 wpa_printf(MSG_ERROR, 436 "WARNING: Could not add Message-Authenticator"); 437 return NULL; 438 } 439 440 return (u8 *) (attr + 1); 441 } 442 443 444 static u8 * radius_msg_auth_pos(struct radius_msg *msg) 445 { 446 u8 *pos; 447 size_t alen; 448 449 if (radius_msg_get_attr_ptr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 450 &pos, &alen, NULL) == 0 && 451 alen == MD5_MAC_LEN) { 452 /* Use already added Message-Authenticator attribute */ 453 return pos; 454 } 455 456 /* Add a Message-Authenticator attribute */ 457 return radius_msg_add_msg_auth(msg); 458 } 459 460 461 int radius_msg_finish(struct radius_msg *msg, const u8 *secret, 462 size_t secret_len) 463 { 464 if (secret) { 465 u8 *pos; 466 467 pos = radius_msg_auth_pos(msg); 468 if (!pos) 469 return -1; 470 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 471 if (hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 472 wpabuf_len(msg->buf), pos) < 0) 473 return -1; 474 } else 475 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 476 477 if (wpabuf_len(msg->buf) > 0xffff) { 478 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)", 479 (unsigned long) wpabuf_len(msg->buf)); 480 return -1; 481 } 482 return 0; 483 } 484 485 486 int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret, 487 size_t secret_len, const u8 *req_authenticator) 488 { 489 const u8 *addr[4]; 490 size_t len[4]; 491 u8 *pos; 492 493 pos = radius_msg_auth_pos(msg); 494 if (!pos) 495 return -1; 496 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 497 os_memcpy(msg->hdr->authenticator, req_authenticator, 498 sizeof(msg->hdr->authenticator)); 499 if (hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 500 wpabuf_len(msg->buf), pos) < 0) 501 return -1; 502 503 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */ 504 addr[0] = (u8 *) msg->hdr; 505 len[0] = 1 + 1 + 2; 506 addr[1] = req_authenticator; 507 len[1] = MD5_MAC_LEN; 508 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr); 509 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 510 addr[3] = secret; 511 len[3] = secret_len; 512 md5_vector(4, addr, len, msg->hdr->authenticator); 513 514 if (wpabuf_len(msg->buf) > 0xffff) { 515 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)", 516 (unsigned long) wpabuf_len(msg->buf)); 517 return -1; 518 } 519 return 0; 520 } 521 522 523 int radius_msg_finish_das_resp(struct radius_msg *msg, const u8 *secret, 524 size_t secret_len, 525 const struct radius_hdr *req_hdr) 526 { 527 const u8 *addr[2]; 528 size_t len[2]; 529 u8 *pos; 530 531 pos = radius_msg_auth_pos(msg); 532 if (!pos) 533 return -1; 534 535 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 536 os_memcpy(msg->hdr->authenticator, req_hdr->authenticator, 16); 537 if (hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 538 wpabuf_len(msg->buf), pos) < 0) 539 return -1; 540 541 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */ 542 addr[0] = wpabuf_head_u8(msg->buf); 543 len[0] = wpabuf_len(msg->buf); 544 addr[1] = secret; 545 len[1] = secret_len; 546 if (md5_vector(2, addr, len, msg->hdr->authenticator) < 0) 547 return -1; 548 549 if (wpabuf_len(msg->buf) > 0xffff) { 550 wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)", 551 (unsigned long) wpabuf_len(msg->buf)); 552 return -1; 553 } 554 return 0; 555 } 556 557 558 void radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret, 559 size_t secret_len) 560 { 561 const u8 *addr[2]; 562 size_t len[2]; 563 564 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 565 os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN); 566 addr[0] = wpabuf_head(msg->buf); 567 len[0] = wpabuf_len(msg->buf); 568 addr[1] = secret; 569 len[1] = secret_len; 570 md5_vector(2, addr, len, msg->hdr->authenticator); 571 572 if (wpabuf_len(msg->buf) > 0xffff) { 573 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)", 574 (unsigned long) wpabuf_len(msg->buf)); 575 } 576 } 577 578 579 void radius_msg_finish_acct_resp(struct radius_msg *msg, const u8 *secret, 580 size_t secret_len, const u8 *req_authenticator) 581 { 582 const u8 *addr[2]; 583 size_t len[2]; 584 585 msg->hdr->length = host_to_be16(wpabuf_len(msg->buf)); 586 os_memcpy(msg->hdr->authenticator, req_authenticator, MD5_MAC_LEN); 587 addr[0] = wpabuf_head(msg->buf); 588 len[0] = wpabuf_len(msg->buf); 589 addr[1] = secret; 590 len[1] = secret_len; 591 md5_vector(2, addr, len, msg->hdr->authenticator); 592 593 if (wpabuf_len(msg->buf) > 0xffff) { 594 wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)", 595 (unsigned long) wpabuf_len(msg->buf)); 596 } 597 } 598 599 600 int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret, 601 size_t secret_len) 602 { 603 const u8 *addr[4]; 604 size_t len[4]; 605 u8 zero[MD5_MAC_LEN]; 606 u8 hash[MD5_MAC_LEN]; 607 608 os_memset(zero, 0, sizeof(zero)); 609 addr[0] = (u8 *) msg->hdr; 610 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN; 611 addr[1] = zero; 612 len[1] = MD5_MAC_LEN; 613 addr[2] = (u8 *) (msg->hdr + 1); 614 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 615 addr[3] = secret; 616 len[3] = secret_len; 617 md5_vector(4, addr, len, hash); 618 return os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0; 619 } 620 621 622 int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret, 623 size_t secret_len, 624 int require_message_authenticator) 625 { 626 const u8 *addr[4]; 627 size_t len[4]; 628 u8 zero[MD5_MAC_LEN]; 629 u8 hash[MD5_MAC_LEN]; 630 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN]; 631 u8 orig_authenticator[16]; 632 633 struct radius_attr_hdr *attr = NULL, *tmp; 634 size_t i; 635 636 os_memset(zero, 0, sizeof(zero)); 637 addr[0] = (u8 *) msg->hdr; 638 len[0] = sizeof(struct radius_hdr) - MD5_MAC_LEN; 639 addr[1] = zero; 640 len[1] = MD5_MAC_LEN; 641 addr[2] = (u8 *) (msg->hdr + 1); 642 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 643 addr[3] = secret; 644 len[3] = secret_len; 645 md5_vector(4, addr, len, hash); 646 if (os_memcmp_const(msg->hdr->authenticator, hash, MD5_MAC_LEN) != 0) 647 return 1; 648 649 for (i = 0; i < msg->attr_used; i++) { 650 tmp = radius_get_attr_hdr(msg, i); 651 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) { 652 if (attr != NULL) { 653 wpa_printf(MSG_WARNING, "Multiple " 654 "Message-Authenticator attributes " 655 "in RADIUS message"); 656 return 1; 657 } 658 attr = tmp; 659 } 660 } 661 662 if (attr == NULL) { 663 if (require_message_authenticator) { 664 wpa_printf(MSG_WARNING, 665 "Missing Message-Authenticator attribute in RADIUS message"); 666 return 1; 667 } 668 return 0; 669 } 670 671 os_memcpy(orig, attr + 1, MD5_MAC_LEN); 672 os_memset(attr + 1, 0, MD5_MAC_LEN); 673 os_memcpy(orig_authenticator, msg->hdr->authenticator, 674 sizeof(orig_authenticator)); 675 os_memset(msg->hdr->authenticator, 0, 676 sizeof(msg->hdr->authenticator)); 677 hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 678 wpabuf_len(msg->buf), auth); 679 os_memcpy(attr + 1, orig, MD5_MAC_LEN); 680 os_memcpy(msg->hdr->authenticator, orig_authenticator, 681 sizeof(orig_authenticator)); 682 683 return os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0; 684 } 685 686 687 static int radius_msg_add_attr_to_array(struct radius_msg *msg, 688 struct radius_attr_hdr *attr) 689 { 690 if (msg->attr_used >= msg->attr_size) { 691 size_t *nattr_pos; 692 size_t nlen = msg->attr_size * 2; 693 694 nattr_pos = os_realloc_array(msg->attr_pos, nlen, 695 sizeof(*msg->attr_pos)); 696 if (nattr_pos == NULL) 697 return -1; 698 699 msg->attr_pos = nattr_pos; 700 msg->attr_size = nlen; 701 } 702 703 msg->attr_pos[msg->attr_used++] = 704 (unsigned char *) attr - wpabuf_head_u8(msg->buf); 705 706 return 0; 707 } 708 709 710 struct radius_attr_hdr * radius_msg_add_attr(struct radius_msg *msg, u16 type, 711 const u8 *data, size_t data_len) 712 { 713 size_t buf_needed, max_len; 714 struct radius_attr_hdr *attr = NULL; 715 struct radius_attr_hdr_ext *ext; 716 u8 ext_type = 0; 717 718 if (TEST_FAIL()) 719 return NULL; 720 721 if (type > 255) { 722 if (!radius_is_ext_type(type >> 8)) { 723 wpa_printf(MSG_ERROR, 724 "%s: Undefined extended type %d.%d", 725 __func__, type >> 8, type & 0xff); 726 return NULL; 727 } 728 ext_type = type & 0xff; 729 type >>= 8; 730 } else if (radius_is_ext_type(type)) { 731 wpa_printf(MSG_ERROR, "%s: Unexpected extended type use for %d", 732 __func__, type); 733 } 734 735 if (radius_is_long_ext_type(type)) { 736 size_t hdr_len = sizeof(struct radius_attr_hdr_ext) + 1; 737 size_t plen = 255 - hdr_len; 738 size_t num; 739 740 max_len = 4096; 741 num = (data_len + plen - 1) / plen; 742 if (num == 0) 743 num = 1; 744 buf_needed = num * hdr_len + data_len; 745 } else if (radius_is_ext_type(type)) { 746 max_len = RADIUS_MAX_EXT_ATTR_LEN; 747 buf_needed = sizeof(struct radius_attr_hdr_ext) + data_len; 748 } else { 749 max_len = RADIUS_MAX_ATTR_LEN; 750 buf_needed = sizeof(*attr) + data_len; 751 } 752 if (data_len > max_len) { 753 wpa_printf(MSG_ERROR, 754 "%s: too long attribute (%zu > %zu bytes)", 755 __func__, data_len, max_len); 756 return NULL; 757 } 758 759 if (wpabuf_tailroom(msg->buf) < buf_needed) { 760 /* allocate more space for message buffer */ 761 if (wpabuf_resize(&msg->buf, buf_needed) < 0) 762 return NULL; 763 msg->hdr = wpabuf_mhead(msg->buf); 764 } 765 766 if (radius_is_long_ext_type(type)) { 767 size_t plen = 255 - sizeof(struct radius_attr_hdr_ext) - 1; 768 size_t alen; 769 770 do { 771 alen = data_len > plen ? plen : data_len; 772 ext = wpabuf_put(msg->buf, 773 sizeof(struct radius_attr_hdr_ext)); 774 if (!attr) 775 attr = (struct radius_attr_hdr *) ext; 776 ext->type = type; 777 ext->length = sizeof(*ext) + 1 + alen; 778 ext->ext_type = ext_type; 779 wpabuf_put_u8(msg->buf, data_len > alen ? 0x80 : 0); 780 wpabuf_put_data(msg->buf, data, data_len); 781 data += alen; 782 data_len -= alen; 783 if (radius_msg_add_attr_to_array( 784 msg, (struct radius_attr_hdr *) ext)) 785 return NULL; 786 } while (data_len > 0); 787 } else if (radius_is_ext_type(type)) { 788 ext = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr_ext)); 789 attr = (struct radius_attr_hdr *) ext; 790 ext->type = type; 791 ext->length = sizeof(*ext) + data_len; 792 ext->ext_type = ext_type; 793 wpabuf_put_data(msg->buf, data, data_len); 794 if (radius_msg_add_attr_to_array(msg, attr)) 795 return NULL; 796 } else { 797 attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr)); 798 attr->type = type; 799 attr->length = sizeof(*attr) + data_len; 800 wpabuf_put_data(msg->buf, data, data_len); 801 if (radius_msg_add_attr_to_array(msg, attr)) 802 return NULL; 803 } 804 805 return attr; 806 } 807 808 809 /** 810 * radius_msg_parse - Parse a RADIUS message 811 * @data: RADIUS message to be parsed 812 * @len: Length of data buffer in octets 813 * Returns: Parsed RADIUS message or %NULL on failure 814 * 815 * This parses a RADIUS message and makes a copy of its data. The caller is 816 * responsible for freeing the returned data with radius_msg_free(). 817 */ 818 struct radius_msg * radius_msg_parse(const u8 *data, size_t len) 819 { 820 struct radius_msg *msg; 821 struct radius_hdr *hdr; 822 struct radius_attr_hdr *attr; 823 size_t msg_len; 824 unsigned char *pos, *end; 825 826 if (data == NULL || len < sizeof(*hdr)) 827 return NULL; 828 829 hdr = (struct radius_hdr *) data; 830 831 msg_len = be_to_host16(hdr->length); 832 if (msg_len < sizeof(*hdr) || msg_len > len) { 833 wpa_printf(MSG_INFO, "RADIUS: Invalid message length"); 834 return NULL; 835 } 836 837 if (msg_len < len) { 838 wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after " 839 "RADIUS message", (unsigned long) len - msg_len); 840 } 841 842 msg = os_zalloc(sizeof(*msg)); 843 if (msg == NULL) 844 return NULL; 845 846 msg->buf = wpabuf_alloc_copy(data, msg_len); 847 if (msg->buf == NULL || radius_msg_initialize(msg)) { 848 radius_msg_free(msg); 849 return NULL; 850 } 851 msg->hdr = wpabuf_mhead(msg->buf); 852 853 /* parse attributes */ 854 pos = wpabuf_mhead_u8(msg->buf) + sizeof(struct radius_hdr); 855 end = wpabuf_mhead_u8(msg->buf) + wpabuf_len(msg->buf); 856 while (pos < end) { 857 if ((size_t) (end - pos) < sizeof(*attr)) 858 goto fail; 859 860 attr = (struct radius_attr_hdr *) pos; 861 862 if (attr->length > end - pos || attr->length < sizeof(*attr)) 863 goto fail; 864 865 /* TODO: check that attr->length is suitable for attr->type */ 866 867 if (radius_msg_add_attr_to_array(msg, attr)) 868 goto fail; 869 870 pos += attr->length; 871 } 872 873 return msg; 874 875 fail: 876 radius_msg_free(msg); 877 return NULL; 878 } 879 880 881 int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len) 882 { 883 const u8 *pos = data; 884 size_t left = data_len; 885 886 while (left > 0) { 887 int len; 888 if (left > RADIUS_MAX_ATTR_LEN) 889 len = RADIUS_MAX_ATTR_LEN; 890 else 891 len = left; 892 893 if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE, 894 pos, len)) 895 return 0; 896 897 pos += len; 898 left -= len; 899 } 900 901 return 1; 902 } 903 904 905 struct wpabuf * radius_msg_get_eap(struct radius_msg *msg) 906 { 907 struct wpabuf *eap; 908 size_t len, i; 909 struct radius_attr_hdr *attr; 910 911 if (msg == NULL) 912 return NULL; 913 914 len = 0; 915 for (i = 0; i < msg->attr_used; i++) { 916 attr = radius_get_attr_hdr(msg, i); 917 if (attr->type == RADIUS_ATTR_EAP_MESSAGE && 918 attr->length > sizeof(struct radius_attr_hdr)) 919 len += attr->length - sizeof(struct radius_attr_hdr); 920 } 921 922 if (len == 0) 923 return NULL; 924 925 eap = wpabuf_alloc(len); 926 if (eap == NULL) 927 return NULL; 928 929 for (i = 0; i < msg->attr_used; i++) { 930 attr = radius_get_attr_hdr(msg, i); 931 if (attr->type == RADIUS_ATTR_EAP_MESSAGE && 932 attr->length > sizeof(struct radius_attr_hdr)) { 933 int flen = attr->length - sizeof(*attr); 934 wpabuf_put_data(eap, attr + 1, flen); 935 } 936 } 937 938 return eap; 939 } 940 941 942 int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret, 943 size_t secret_len, const u8 *req_auth) 944 { 945 u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN]; 946 u8 orig_authenticator[16]; 947 struct radius_attr_hdr *attr = NULL, *tmp; 948 size_t i; 949 950 for (i = 0; i < msg->attr_used; i++) { 951 tmp = radius_get_attr_hdr(msg, i); 952 if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) { 953 if (attr != NULL) { 954 wpa_printf(MSG_INFO, "Multiple Message-Authenticator attributes in RADIUS message"); 955 return 1; 956 } 957 attr = tmp; 958 } 959 } 960 961 if (attr == NULL) { 962 wpa_printf(MSG_INFO, "No Message-Authenticator attribute found"); 963 return 1; 964 } 965 966 os_memcpy(orig, attr + 1, MD5_MAC_LEN); 967 os_memset(attr + 1, 0, MD5_MAC_LEN); 968 if (req_auth) { 969 os_memcpy(orig_authenticator, msg->hdr->authenticator, 970 sizeof(orig_authenticator)); 971 os_memcpy(msg->hdr->authenticator, req_auth, 972 sizeof(msg->hdr->authenticator)); 973 } 974 if (hmac_md5(secret, secret_len, wpabuf_head(msg->buf), 975 wpabuf_len(msg->buf), auth) < 0) 976 return 1; 977 os_memcpy(attr + 1, orig, MD5_MAC_LEN); 978 if (req_auth) { 979 os_memcpy(msg->hdr->authenticator, orig_authenticator, 980 sizeof(orig_authenticator)); 981 } 982 983 if (os_memcmp_const(orig, auth, MD5_MAC_LEN) != 0) { 984 wpa_printf(MSG_INFO, "Invalid Message-Authenticator!"); 985 return 1; 986 } 987 988 return 0; 989 } 990 991 992 int radius_msg_verify(struct radius_msg *msg, const u8 *secret, 993 size_t secret_len, struct radius_msg *sent_msg, int auth) 994 { 995 const u8 *addr[4]; 996 size_t len[4]; 997 u8 hash[MD5_MAC_LEN]; 998 999 if (sent_msg == NULL) { 1000 wpa_printf(MSG_INFO, "No matching Access-Request message found"); 1001 return 1; 1002 } 1003 1004 if (!auth) { 1005 u8 *pos; 1006 size_t alen; 1007 1008 if (radius_msg_get_attr_ptr(msg, 1009 RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 1010 &pos, &alen, NULL) == 0) { 1011 /* Check the Message-Authenticator attribute since it 1012 * was included even if we are configured to not 1013 * require it. */ 1014 auth = 1; 1015 } 1016 } 1017 1018 if (auth && 1019 radius_msg_verify_msg_auth(msg, secret, secret_len, 1020 sent_msg->hdr->authenticator)) { 1021 return 1; 1022 } 1023 1024 /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */ 1025 addr[0] = (u8 *) msg->hdr; 1026 len[0] = 1 + 1 + 2; 1027 addr[1] = sent_msg->hdr->authenticator; 1028 len[1] = MD5_MAC_LEN; 1029 addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr); 1030 len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr); 1031 addr[3] = secret; 1032 len[3] = secret_len; 1033 if (md5_vector(4, addr, len, hash) < 0 || 1034 os_memcmp_const(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) { 1035 wpa_printf(MSG_INFO, "Response Authenticator invalid!"); 1036 return 1; 1037 } 1038 1039 return 0; 1040 } 1041 1042 1043 int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src, 1044 u8 type) 1045 { 1046 struct radius_attr_hdr *attr; 1047 size_t i; 1048 int count = 0; 1049 1050 for (i = 0; i < src->attr_used; i++) { 1051 attr = radius_get_attr_hdr(src, i); 1052 if (attr->type == type && attr->length >= sizeof(*attr)) { 1053 if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1), 1054 attr->length - sizeof(*attr))) 1055 return -1; 1056 count++; 1057 } 1058 } 1059 1060 return count; 1061 } 1062 1063 1064 /* Create Request Authenticator. The value should be unique over the lifetime 1065 * of the shared secret between authenticator and authentication server. 1066 */ 1067 int radius_msg_make_authenticator(struct radius_msg *msg) 1068 { 1069 return os_get_random((u8 *) &msg->hdr->authenticator, 1070 sizeof(msg->hdr->authenticator)); 1071 } 1072 1073 1074 /* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message. 1075 * Returns the Attribute payload and sets alen to indicate the length of the 1076 * payload if a vendor attribute with subtype is found, otherwise returns NULL. 1077 * The returned payload is allocated with os_malloc() and caller must free it 1078 * by calling os_free(). 1079 */ 1080 static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor, 1081 u8 subtype, size_t *alen) 1082 { 1083 u8 *data, *pos; 1084 size_t i, len; 1085 1086 if (msg == NULL) 1087 return NULL; 1088 1089 for (i = 0; i < msg->attr_used; i++) { 1090 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i); 1091 size_t left; 1092 u32 vendor_id; 1093 struct radius_attr_vendor *vhdr; 1094 1095 if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC || 1096 attr->length < sizeof(*attr)) 1097 continue; 1098 1099 left = attr->length - sizeof(*attr); 1100 if (left < 4) 1101 continue; 1102 1103 pos = (u8 *) (attr + 1); 1104 1105 os_memcpy(&vendor_id, pos, 4); 1106 pos += 4; 1107 left -= 4; 1108 1109 if (ntohl(vendor_id) != vendor) 1110 continue; 1111 1112 while (left >= sizeof(*vhdr)) { 1113 vhdr = (struct radius_attr_vendor *) pos; 1114 if (vhdr->vendor_length > left || 1115 vhdr->vendor_length < sizeof(*vhdr)) { 1116 break; 1117 } 1118 if (vhdr->vendor_type != subtype) { 1119 pos += vhdr->vendor_length; 1120 left -= vhdr->vendor_length; 1121 continue; 1122 } 1123 1124 len = vhdr->vendor_length - sizeof(*vhdr); 1125 data = os_memdup(pos + sizeof(*vhdr), len); 1126 if (data == NULL) 1127 return NULL; 1128 if (alen) 1129 *alen = len; 1130 return data; 1131 } 1132 } 1133 1134 return NULL; 1135 } 1136 1137 1138 static u8 * decrypt_ms_key(const u8 *key, size_t len, 1139 const u8 *req_authenticator, 1140 const u8 *secret, size_t secret_len, size_t *reslen) 1141 { 1142 u8 *plain, *ppos, *res; 1143 const u8 *pos; 1144 size_t left, plen; 1145 u8 hash[MD5_MAC_LEN]; 1146 int i, first = 1; 1147 const u8 *addr[3]; 1148 size_t elen[3]; 1149 1150 /* key: 16-bit salt followed by encrypted key info */ 1151 1152 if (len < 2 + 16) { 1153 wpa_printf(MSG_DEBUG, "RADIUS: %s: Len is too small: %d", 1154 __func__, (int) len); 1155 return NULL; 1156 } 1157 1158 pos = key + 2; 1159 left = len - 2; 1160 if (left % 16) { 1161 wpa_printf(MSG_INFO, "RADIUS: Invalid ms key len %lu", 1162 (unsigned long) left); 1163 return NULL; 1164 } 1165 1166 plen = left; 1167 ppos = plain = os_malloc(plen); 1168 if (plain == NULL) 1169 return NULL; 1170 plain[0] = 0; 1171 1172 while (left > 0) { 1173 /* b(1) = MD5(Secret + Request-Authenticator + Salt) 1174 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */ 1175 1176 addr[0] = secret; 1177 elen[0] = secret_len; 1178 if (first) { 1179 addr[1] = req_authenticator; 1180 elen[1] = MD5_MAC_LEN; 1181 addr[2] = key; 1182 elen[2] = 2; /* Salt */ 1183 } else { 1184 addr[1] = pos - MD5_MAC_LEN; 1185 elen[1] = MD5_MAC_LEN; 1186 } 1187 if (md5_vector(first ? 3 : 2, addr, elen, hash) < 0) { 1188 os_free(plain); 1189 return NULL; 1190 } 1191 first = 0; 1192 1193 for (i = 0; i < MD5_MAC_LEN; i++) 1194 *ppos++ = *pos++ ^ hash[i]; 1195 left -= MD5_MAC_LEN; 1196 } 1197 1198 if (plain[0] == 0 || plain[0] > plen - 1) { 1199 wpa_printf(MSG_INFO, "RADIUS: Failed to decrypt MPPE key"); 1200 os_free(plain); 1201 return NULL; 1202 } 1203 1204 res = os_memdup(plain + 1, plain[0]); 1205 if (res == NULL) { 1206 os_free(plain); 1207 return NULL; 1208 } 1209 if (reslen) 1210 *reslen = plain[0]; 1211 os_free(plain); 1212 return res; 1213 } 1214 1215 1216 static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt, 1217 const u8 *req_authenticator, 1218 const u8 *secret, size_t secret_len, 1219 u8 *ebuf, size_t *elen) 1220 { 1221 int i, len, first = 1; 1222 u8 hash[MD5_MAC_LEN], saltbuf[2], *pos; 1223 const u8 *addr[3]; 1224 size_t _len[3]; 1225 1226 WPA_PUT_BE16(saltbuf, salt); 1227 1228 len = 1 + key_len; 1229 if (len & 0x0f) { 1230 len = (len & 0xf0) + 16; 1231 } 1232 os_memset(ebuf, 0, len); 1233 ebuf[0] = key_len; 1234 os_memcpy(ebuf + 1, key, key_len); 1235 1236 *elen = len; 1237 1238 pos = ebuf; 1239 while (len > 0) { 1240 /* b(1) = MD5(Secret + Request-Authenticator + Salt) 1241 * b(i) = MD5(Secret + c(i - 1)) for i > 1 */ 1242 addr[0] = secret; 1243 _len[0] = secret_len; 1244 if (first) { 1245 addr[1] = req_authenticator; 1246 _len[1] = MD5_MAC_LEN; 1247 addr[2] = saltbuf; 1248 _len[2] = sizeof(saltbuf); 1249 } else { 1250 addr[1] = pos - MD5_MAC_LEN; 1251 _len[1] = MD5_MAC_LEN; 1252 } 1253 md5_vector(first ? 3 : 2, addr, _len, hash); 1254 first = 0; 1255 1256 for (i = 0; i < MD5_MAC_LEN; i++) 1257 *pos++ ^= hash[i]; 1258 1259 len -= MD5_MAC_LEN; 1260 } 1261 } 1262 1263 1264 struct radius_ms_mppe_keys * 1265 radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg, 1266 const u8 *secret, size_t secret_len) 1267 { 1268 u8 *key; 1269 size_t keylen; 1270 struct radius_ms_mppe_keys *keys; 1271 1272 if (msg == NULL || sent_msg == NULL) 1273 return NULL; 1274 1275 keys = os_zalloc(sizeof(*keys)); 1276 if (keys == NULL) 1277 return NULL; 1278 1279 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT, 1280 RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY, 1281 &keylen); 1282 if (key) { 1283 keys->send = decrypt_ms_key(key, keylen, 1284 sent_msg->hdr->authenticator, 1285 secret, secret_len, 1286 &keys->send_len); 1287 if (!keys->send) { 1288 wpa_printf(MSG_DEBUG, 1289 "RADIUS: Failed to decrypt send key"); 1290 } 1291 os_free(key); 1292 } 1293 1294 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT, 1295 RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY, 1296 &keylen); 1297 if (key) { 1298 keys->recv = decrypt_ms_key(key, keylen, 1299 sent_msg->hdr->authenticator, 1300 secret, secret_len, 1301 &keys->recv_len); 1302 if (!keys->recv) { 1303 wpa_printf(MSG_DEBUG, 1304 "RADIUS: Failed to decrypt recv key"); 1305 } 1306 os_free(key); 1307 } 1308 1309 return keys; 1310 } 1311 1312 1313 struct radius_ms_mppe_keys * 1314 radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg, 1315 const u8 *secret, size_t secret_len) 1316 { 1317 u8 *key; 1318 size_t keylen; 1319 struct radius_ms_mppe_keys *keys; 1320 1321 if (msg == NULL || sent_msg == NULL) 1322 return NULL; 1323 1324 keys = os_zalloc(sizeof(*keys)); 1325 if (keys == NULL) 1326 return NULL; 1327 1328 key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO, 1329 RADIUS_CISCO_AV_PAIR, &keylen); 1330 if (key && keylen == 51 && 1331 os_memcmp(key, "leap:session-key=", 17) == 0) { 1332 keys->recv = decrypt_ms_key(key + 17, keylen - 17, 1333 sent_msg->hdr->authenticator, 1334 secret, secret_len, 1335 &keys->recv_len); 1336 } 1337 os_free(key); 1338 1339 return keys; 1340 } 1341 1342 1343 int radius_msg_add_mppe_keys(struct radius_msg *msg, 1344 const u8 *req_authenticator, 1345 const u8 *secret, size_t secret_len, 1346 const u8 *send_key, size_t send_key_len, 1347 const u8 *recv_key, size_t recv_key_len) 1348 { 1349 struct radius_attr_hdr *attr; 1350 u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT); 1351 u8 *buf; 1352 struct radius_attr_vendor *vhdr; 1353 u8 *pos; 1354 size_t elen; 1355 int hlen; 1356 u16 salt; 1357 1358 hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2; 1359 1360 /* MS-MPPE-Send-Key */ 1361 buf = os_malloc(hlen + send_key_len + 16); 1362 if (buf == NULL) { 1363 return 0; 1364 } 1365 pos = buf; 1366 os_memcpy(pos, &vendor_id, sizeof(vendor_id)); 1367 pos += sizeof(vendor_id); 1368 vhdr = (struct radius_attr_vendor *) pos; 1369 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY; 1370 pos = (u8 *) (vhdr + 1); 1371 if (os_get_random((u8 *) &salt, sizeof(salt)) < 0) { 1372 os_free(buf); 1373 return 0; 1374 } 1375 salt |= 0x8000; 1376 WPA_PUT_BE16(pos, salt); 1377 pos += 2; 1378 encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret, 1379 secret_len, pos, &elen); 1380 vhdr->vendor_length = hlen + elen - sizeof(vendor_id); 1381 1382 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC, 1383 buf, hlen + elen); 1384 os_free(buf); 1385 if (attr == NULL) { 1386 return 0; 1387 } 1388 1389 /* MS-MPPE-Recv-Key */ 1390 buf = os_malloc(hlen + recv_key_len + 16); 1391 if (buf == NULL) { 1392 return 0; 1393 } 1394 pos = buf; 1395 os_memcpy(pos, &vendor_id, sizeof(vendor_id)); 1396 pos += sizeof(vendor_id); 1397 vhdr = (struct radius_attr_vendor *) pos; 1398 vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY; 1399 pos = (u8 *) (vhdr + 1); 1400 salt ^= 1; 1401 WPA_PUT_BE16(pos, salt); 1402 pos += 2; 1403 encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret, 1404 secret_len, pos, &elen); 1405 vhdr->vendor_length = hlen + elen - sizeof(vendor_id); 1406 1407 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC, 1408 buf, hlen + elen); 1409 os_free(buf); 1410 if (attr == NULL) { 1411 return 0; 1412 } 1413 1414 return 1; 1415 } 1416 1417 1418 int radius_msg_add_wfa(struct radius_msg *msg, u8 subtype, const u8 *data, 1419 size_t len) 1420 { 1421 struct radius_attr_hdr *attr; 1422 u8 *buf, *pos; 1423 size_t alen; 1424 1425 alen = 4 + 2 + len; 1426 buf = os_malloc(alen); 1427 if (buf == NULL) 1428 return 0; 1429 pos = buf; 1430 WPA_PUT_BE32(pos, RADIUS_VENDOR_ID_WFA); 1431 pos += 4; 1432 *pos++ = subtype; 1433 *pos++ = 2 + len; 1434 os_memcpy(pos, data, len); 1435 attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC, 1436 buf, alen); 1437 os_free(buf); 1438 if (attr == NULL) 1439 return 0; 1440 1441 return 1; 1442 } 1443 1444 1445 int radius_msg_add_ext_vs(struct radius_msg *msg, u16 type, u32 vendor_id, 1446 u8 vendor_type, const u8 *data, size_t len) 1447 { 1448 struct radius_attr_hdr *attr; 1449 u8 *buf, *pos; 1450 size_t alen; 1451 1452 alen = 4 + 1 + len; 1453 buf = os_malloc(alen); 1454 if (!buf) 1455 return 0; 1456 pos = buf; 1457 WPA_PUT_BE32(pos, vendor_id); 1458 pos += 4; 1459 *pos++ = vendor_type; 1460 os_memcpy(pos, data, len); 1461 attr = radius_msg_add_attr(msg, type, buf, alen); 1462 os_free(buf); 1463 return attr != NULL; 1464 } 1465 1466 1467 int radius_user_password_hide(struct radius_msg *msg, 1468 const u8 *data, size_t data_len, 1469 const u8 *secret, size_t secret_len, 1470 u8 *buf, size_t buf_len) 1471 { 1472 size_t padlen, i, pos; 1473 const u8 *addr[2]; 1474 size_t len[2]; 1475 u8 hash[16]; 1476 1477 if (data_len + 16 > buf_len) 1478 return -1; 1479 1480 os_memcpy(buf, data, data_len); 1481 1482 padlen = data_len % 16; 1483 if (padlen && data_len < buf_len) { 1484 padlen = 16 - padlen; 1485 os_memset(buf + data_len, 0, padlen); 1486 buf_len = data_len + padlen; 1487 } else { 1488 buf_len = data_len; 1489 } 1490 1491 addr[0] = secret; 1492 len[0] = secret_len; 1493 addr[1] = msg->hdr->authenticator; 1494 len[1] = 16; 1495 md5_vector(2, addr, len, hash); 1496 1497 for (i = 0; i < 16; i++) 1498 buf[i] ^= hash[i]; 1499 pos = 16; 1500 1501 while (pos < buf_len) { 1502 addr[0] = secret; 1503 len[0] = secret_len; 1504 addr[1] = &buf[pos - 16]; 1505 len[1] = 16; 1506 md5_vector(2, addr, len, hash); 1507 1508 for (i = 0; i < 16; i++) 1509 buf[pos + i] ^= hash[i]; 1510 1511 pos += 16; 1512 } 1513 1514 return buf_len; 1515 } 1516 1517 1518 /* Add User-Password attribute to a RADIUS message and encrypt it as specified 1519 * in RFC 2865, Chap. 5.2 */ 1520 struct radius_attr_hdr * 1521 radius_msg_add_attr_user_password(struct radius_msg *msg, 1522 const u8 *data, size_t data_len, 1523 const u8 *secret, size_t secret_len) 1524 { 1525 u8 buf[128]; 1526 int res; 1527 1528 res = radius_user_password_hide(msg, data, data_len, 1529 secret, secret_len, buf, sizeof(buf)); 1530 if (res < 0) 1531 return NULL; 1532 1533 return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD, 1534 buf, res); 1535 } 1536 1537 1538 int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len) 1539 { 1540 struct radius_attr_hdr *attr = NULL, *tmp; 1541 size_t i, dlen; 1542 1543 for (i = 0; i < msg->attr_used; i++) { 1544 tmp = radius_get_attr_hdr(msg, i); 1545 if (tmp->type == type) { 1546 attr = tmp; 1547 break; 1548 } 1549 } 1550 1551 if (!attr || attr->length < sizeof(*attr)) 1552 return -1; 1553 1554 dlen = attr->length - sizeof(*attr); 1555 if (buf) 1556 os_memcpy(buf, (attr + 1), dlen > len ? len : dlen); 1557 return dlen; 1558 } 1559 1560 1561 int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf, 1562 size_t *len, const u8 *start) 1563 { 1564 size_t i; 1565 struct radius_attr_hdr *attr = NULL, *tmp; 1566 1567 for (i = 0; i < msg->attr_used; i++) { 1568 tmp = radius_get_attr_hdr(msg, i); 1569 if (tmp->type == type && 1570 (start == NULL || (u8 *) tmp > start)) { 1571 attr = tmp; 1572 break; 1573 } 1574 } 1575 1576 if (!attr || attr->length < sizeof(*attr)) 1577 return -1; 1578 1579 *buf = (u8 *) (attr + 1); 1580 *len = attr->length - sizeof(*attr); 1581 return 0; 1582 } 1583 1584 1585 int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len) 1586 { 1587 size_t i; 1588 int count; 1589 1590 for (count = 0, i = 0; i < msg->attr_used; i++) { 1591 struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i); 1592 if (attr->type == type && 1593 attr->length >= sizeof(struct radius_attr_hdr) + min_len) 1594 count++; 1595 } 1596 1597 return count; 1598 } 1599 1600 1601 struct radius_tunnel_attrs { 1602 int tag_used; 1603 int type; /* Tunnel-Type */ 1604 int medium_type; /* Tunnel-Medium-Type */ 1605 int vlanid; 1606 }; 1607 1608 1609 static int cmp_int(const void *a, const void *b) 1610 { 1611 int x, y; 1612 1613 x = *((int *) a); 1614 y = *((int *) b); 1615 return (x - y); 1616 } 1617 1618 1619 /** 1620 * radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information 1621 * The k tagged vlans found are sorted by vlan_id and stored in the first k 1622 * items of tagged. 1623 * 1624 * @msg: RADIUS message 1625 * @untagged: Pointer to store untagged vid 1626 * @numtagged: Size of tagged 1627 * @tagged: Pointer to store tagged list 1628 * 1629 * Returns: 0 if neither tagged nor untagged configuration is found, 1 otherwise 1630 */ 1631 int radius_msg_get_vlanid(struct radius_msg *msg, int *untagged, int numtagged, 1632 int *tagged) 1633 { 1634 struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun; 1635 size_t i; 1636 struct radius_attr_hdr *attr = NULL; 1637 const u8 *data; 1638 char buf[10]; 1639 size_t dlen; 1640 int j, taggedidx = 0, vlan_id; 1641 1642 os_memset(&tunnel, 0, sizeof(tunnel)); 1643 for (j = 0; j < numtagged; j++) 1644 tagged[j] = 0; 1645 *untagged = 0; 1646 1647 for (i = 0; i < msg->attr_used; i++) { 1648 attr = radius_get_attr_hdr(msg, i); 1649 if (attr->length < sizeof(*attr)) 1650 return -1; 1651 data = (const u8 *) (attr + 1); 1652 dlen = attr->length - sizeof(*attr); 1653 if (attr->length < 3) 1654 continue; 1655 if (data[0] >= RADIUS_TUNNEL_TAGS) 1656 tun = &tunnel[0]; 1657 else 1658 tun = &tunnel[data[0]]; 1659 1660 switch (attr->type) { 1661 case RADIUS_ATTR_TUNNEL_TYPE: 1662 if (attr->length != 6) 1663 break; 1664 tun->tag_used++; 1665 tun->type = WPA_GET_BE24(data + 1); 1666 break; 1667 case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE: 1668 if (attr->length != 6) 1669 break; 1670 tun->tag_used++; 1671 tun->medium_type = WPA_GET_BE24(data + 1); 1672 break; 1673 case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID: 1674 if (data[0] < RADIUS_TUNNEL_TAGS) { 1675 data++; 1676 dlen--; 1677 } 1678 if (dlen >= sizeof(buf)) 1679 break; 1680 os_memcpy(buf, data, dlen); 1681 buf[dlen] = '\0'; 1682 vlan_id = atoi(buf); 1683 if (vlan_id <= 0) 1684 break; 1685 tun->tag_used++; 1686 tun->vlanid = vlan_id; 1687 break; 1688 case RADIUS_ATTR_EGRESS_VLANID: /* RFC 4675 */ 1689 if (attr->length != 6) 1690 break; 1691 vlan_id = WPA_GET_BE24(data + 1); 1692 if (vlan_id <= 0) 1693 break; 1694 if (data[0] == 0x32) 1695 *untagged = vlan_id; 1696 else if (data[0] == 0x31 && tagged && 1697 taggedidx < numtagged) 1698 tagged[taggedidx++] = vlan_id; 1699 break; 1700 } 1701 } 1702 1703 /* Use tunnel with the lowest tag for untagged VLAN id */ 1704 for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) { 1705 tun = &tunnel[i]; 1706 if (tun->tag_used && 1707 tun->type == RADIUS_TUNNEL_TYPE_VLAN && 1708 tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 && 1709 tun->vlanid > 0) { 1710 *untagged = tun->vlanid; 1711 break; 1712 } 1713 } 1714 1715 if (taggedidx) 1716 qsort(tagged, taggedidx, sizeof(int), cmp_int); 1717 1718 if (*untagged > 0 || taggedidx) 1719 return 1; 1720 return 0; 1721 } 1722 1723 1724 /** 1725 * radius_msg_get_tunnel_password - Parse RADIUS attribute Tunnel-Password 1726 * @msg: Received RADIUS message 1727 * @keylen: Length of returned password 1728 * @secret: RADIUS shared secret 1729 * @secret_len: Length of secret 1730 * @sent_msg: Sent RADIUS message 1731 * @n: Number of password attribute to return (starting with 0) 1732 * Returns: Pointer to n-th password (free with os_free) or %NULL 1733 */ 1734 char * radius_msg_get_tunnel_password(struct radius_msg *msg, int *keylen, 1735 const u8 *secret, size_t secret_len, 1736 struct radius_msg *sent_msg, size_t n) 1737 { 1738 u8 *buf = NULL; 1739 size_t buflen; 1740 const u8 *salt; 1741 u8 *str; 1742 const u8 *addr[3]; 1743 size_t len[3]; 1744 u8 hash[16]; 1745 u8 *pos; 1746 size_t i, j = 0; 1747 struct radius_attr_hdr *attr; 1748 const u8 *data; 1749 size_t dlen; 1750 const u8 *fdata = NULL; /* points to found item */ 1751 size_t fdlen = -1; 1752 char *ret = NULL; 1753 1754 /* find n-th valid Tunnel-Password attribute */ 1755 for (i = 0; i < msg->attr_used; i++) { 1756 attr = radius_get_attr_hdr(msg, i); 1757 if (attr == NULL || 1758 attr->type != RADIUS_ATTR_TUNNEL_PASSWORD) { 1759 continue; 1760 } 1761 if (attr->length <= 5) 1762 continue; 1763 data = (const u8 *) (attr + 1); 1764 dlen = attr->length - sizeof(*attr); 1765 if (dlen <= 3 || dlen % 16 != 3) 1766 continue; 1767 j++; 1768 if (j <= n) 1769 continue; 1770 1771 fdata = data; 1772 fdlen = dlen; 1773 break; 1774 } 1775 if (fdata == NULL) 1776 goto out; 1777 1778 /* alloc writable memory for decryption */ 1779 buf = os_memdup(fdata, fdlen); 1780 if (buf == NULL) 1781 goto out; 1782 buflen = fdlen; 1783 1784 /* init pointers */ 1785 salt = buf + 1; 1786 str = buf + 3; 1787 1788 /* decrypt blocks */ 1789 pos = buf + buflen - 16; /* last block */ 1790 while (pos >= str + 16) { /* all but the first block */ 1791 addr[0] = secret; 1792 len[0] = secret_len; 1793 addr[1] = pos - 16; 1794 len[1] = 16; 1795 md5_vector(2, addr, len, hash); 1796 1797 for (i = 0; i < 16; i++) 1798 pos[i] ^= hash[i]; 1799 1800 pos -= 16; 1801 } 1802 1803 /* decrypt first block */ 1804 if (str != pos) 1805 goto out; 1806 addr[0] = secret; 1807 len[0] = secret_len; 1808 addr[1] = sent_msg->hdr->authenticator; 1809 len[1] = 16; 1810 addr[2] = salt; 1811 len[2] = 2; 1812 md5_vector(3, addr, len, hash); 1813 1814 for (i = 0; i < 16; i++) 1815 pos[i] ^= hash[i]; 1816 1817 /* derive plaintext length from first subfield */ 1818 *keylen = (unsigned char) str[0]; 1819 if ((u8 *) (str + *keylen) >= (u8 *) (buf + buflen)) { 1820 /* decryption error - invalid key length */ 1821 goto out; 1822 } 1823 if (*keylen == 0) { 1824 /* empty password */ 1825 goto out; 1826 } 1827 1828 /* copy passphrase into new buffer */ 1829 ret = os_malloc(*keylen); 1830 if (ret) 1831 os_memcpy(ret, str + 1, *keylen); 1832 1833 out: 1834 /* return new buffer */ 1835 os_free(buf); 1836 return ret; 1837 } 1838 1839 1840 void radius_free_class(struct radius_class_data *c) 1841 { 1842 size_t i; 1843 if (c == NULL) 1844 return; 1845 for (i = 0; i < c->count; i++) 1846 os_free(c->attr[i].data); 1847 os_free(c->attr); 1848 c->attr = NULL; 1849 c->count = 0; 1850 } 1851 1852 1853 int radius_copy_class(struct radius_class_data *dst, 1854 const struct radius_class_data *src) 1855 { 1856 size_t i; 1857 1858 if (src->attr == NULL) 1859 return 0; 1860 1861 dst->attr = os_calloc(src->count, sizeof(struct radius_attr_data)); 1862 if (dst->attr == NULL) 1863 return -1; 1864 1865 dst->count = 0; 1866 1867 for (i = 0; i < src->count; i++) { 1868 dst->attr[i].data = os_memdup(src->attr[i].data, 1869 src->attr[i].len); 1870 if (dst->attr[i].data == NULL) 1871 break; 1872 dst->count++; 1873 dst->attr[i].len = src->attr[i].len; 1874 } 1875 1876 return 0; 1877 } 1878 1879 1880 u8 radius_msg_find_unlisted_attr(struct radius_msg *msg, u8 *attrs) 1881 { 1882 size_t i, j; 1883 struct radius_attr_hdr *attr; 1884 1885 for (i = 0; i < msg->attr_used; i++) { 1886 attr = radius_get_attr_hdr(msg, i); 1887 1888 for (j = 0; attrs[j]; j++) { 1889 if (attr->type == attrs[j]) 1890 break; 1891 } 1892 1893 if (attrs[j] == 0) 1894 return attr->type; /* unlisted attr */ 1895 } 1896 1897 return 0; 1898 } 1899 1900 1901 int radius_gen_session_id(u8 *id, size_t len) 1902 { 1903 /* 1904 * Acct-Session-Id and Acct-Multi-Session-Id should be globally and 1905 * temporarily unique. A high quality random number is required 1906 * therefore. This could be be improved by switching to a GUID. 1907 */ 1908 return os_get_random(id, len); 1909 } 1910
Indexes created Mon Jun 22 00:25:11 UTC 2026