src/ap/accounting.c

   1 /*
   2  * hostapd / RADIUS Accounting
   3  * Copyright (c) 2002-2009, 2012-2015, 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/eloop.h"
  13 #include "eapol_auth/eapol_auth_sm.h"
  14 #include "eapol_auth/eapol_auth_sm_i.h"
  15 #include "radius/radius.h"
  16 #include "radius/radius_client.h"
  17 #include "hostapd.h"
  18 #include "ieee802_1x.h"
  19 #include "ap_config.h"
  20 #include "sta_info.h"
  21 #include "ap_drv_ops.h"
  22 #include "accounting.h"
  23
  24
  25 /* Default interval in seconds for polling TX/RX octets from the driver if
  26  * STA is not using interim accounting. This detects wrap arounds for
  27  * input/output octets and updates Acct-{Input,Output}-Gigawords. */
  28 #define ACCT_DEFAULT_UPDATE_INTERVAL 300
  29
  30 static void accounting_sta_interim(struct hostapd_data *hapd,
  31                                    struct sta_info *sta);
  32
  33
  34 static struct radius_msg * accounting_msg(struct hostapd_data *hapd,
  35                                           struct sta_info *sta,
  36                                           int status_type)
  37 {
  38         struct radius_msg *msg;
  39         char buf[128];
  40         u8 *val;
  41         size_t len;
  42         int i;
  43         struct wpabuf *b;
  44         struct os_time now;
  45
  46         msg = radius_msg_new(RADIUS_CODE_ACCOUNTING_REQUEST,
  47                              radius_client_get_id(hapd->radius));
  48         if (msg == NULL) {
  49                 wpa_printf(MSG_INFO, "Could not create new RADIUS packet");
  50                 return NULL;
  51         }
  52
  53         if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_ACCT_STATUS_TYPE,
  54                                        status_type)) {
  55                 wpa_printf(MSG_INFO, "Could not add Acct-Status-Type");
  56                 goto fail;
  57         }
  58
  59         if (sta) {
  60                 if (!hostapd_config_get_radius_attr(
  61                             hapd->conf->radius_acct_req_attr,
  62                             RADIUS_ATTR_ACCT_AUTHENTIC) &&
  63                     !radius_msg_add_attr_int32(msg, RADIUS_ATTR_ACCT_AUTHENTIC,
  64                                                hapd->conf->ieee802_1x ?
  65                                                RADIUS_ACCT_AUTHENTIC_RADIUS :
  66                                                RADIUS_ACCT_AUTHENTIC_LOCAL)) {
  67                         wpa_printf(MSG_INFO, "Could not add Acct-Authentic");
  68                         goto fail;
  69                 }
  70
  71                 /* Use 802.1X identity if available */
  72                 val = ieee802_1x_get_identity(sta->eapol_sm, &len);
  73
  74                 /* Use RADIUS ACL identity if 802.1X provides no identity */
  75                 if (!val && sta->identity) {
  76                         val = (u8 *) sta->identity;
  77                         len = os_strlen(sta->identity);
  78                 }
  79
  80                 /* Use STA MAC if neither 802.1X nor RADIUS ACL provided
  81                  * identity */
  82                 if (!val) {
  83                         os_snprintf(buf, sizeof(buf), RADIUS_ADDR_FORMAT,
  84                                     MAC2STR(sta->addr));
  85                         val = (u8 *) buf;
  86                         len = os_strlen(buf);
  87                 }
  88
  89                 if (!radius_msg_add_attr(msg, RADIUS_ATTR_USER_NAME, val,
  90                                          len)) {
  91                         wpa_printf(MSG_INFO, "Could not add User-Name");
  92                         goto fail;
  93                 }
  94         }
  95
  96         if (add_common_radius_attr(hapd, hapd->conf->radius_acct_req_attr, sta,
  97                                    msg) < 0)
  98                 goto fail;
  99
 100         if (sta && add_sqlite_radius_attr(hapd, sta, msg, 1) < 0)
 101                 goto fail;
 102
 103         if (sta) {
 104                 for (i = 0; ; i++) {
 105                         val = ieee802_1x_get_radius_class(sta->eapol_sm, &len,
 106                                                           i);
 107                         if (val == NULL)
 108                                 break;
 109
 110                         if (!radius_msg_add_attr(msg, RADIUS_ATTR_CLASS,
 111                                                  val, len)) {
 112                                 wpa_printf(MSG_INFO, "Could not add Class");
 113                                 goto fail;
 114                         }
 115                 }
 116
 117                 b = ieee802_1x_get_radius_cui(sta->eapol_sm);
 118                 if (b &&
 119                     !radius_msg_add_attr(msg,
 120                                          RADIUS_ATTR_CHARGEABLE_USER_IDENTITY,
 121                                          wpabuf_head(b), wpabuf_len(b))) {
 122                         wpa_printf(MSG_ERROR, "Could not add CUI");
 123                         goto fail;
 124                 }
 125
 126                 if (!b && sta->radius_cui &&
 127                     !radius_msg_add_attr(msg,
 128                                          RADIUS_ATTR_CHARGEABLE_USER_IDENTITY,
 129                                          (u8 *) sta->radius_cui,
 130                                          os_strlen(sta->radius_cui))) {
 131                         wpa_printf(MSG_ERROR, "Could not add CUI from ACL");
 132                         goto fail;
 133                 }
 134
 135                 if (sta->ipaddr &&
 136                     !radius_msg_add_attr_int32(msg,
 137                                                RADIUS_ATTR_FRAMED_IP_ADDRESS,
 138                                                be_to_host32(sta->ipaddr))) {
 139                         wpa_printf(MSG_ERROR,
 140                                    "Could not add Framed-IP-Address");
 141                         goto fail;
 142                 }
 143         }
 144
 145         os_get_time(&now);
 146         if (now.sec > 1000000000 &&
 147             !radius_msg_add_attr_int32(msg, RADIUS_ATTR_EVENT_TIMESTAMP,
 148                                        now.sec)) {
 149                 wpa_printf(MSG_INFO, "Could not add Event-Timestamp");
 150                 goto fail;
 151         }
 152
 153         /*
 154          * Add Acct-Delay-Time with zero value for the first transmission. This
 155          * will be updated within radius_client.c when retransmitting the frame.
 156          */
 157         if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_ACCT_DELAY_TIME, 0)) {
 158                 wpa_printf(MSG_INFO, "Could not add Acct-Delay-Time");
 159                 goto fail;
 160         }
 161
 162         return msg;
 163
 164  fail:
 165         radius_msg_free(msg);
 166         return NULL;
 167 }
 168
 169
 170 static int accounting_sta_update_stats(struct hostapd_data *hapd,
 171                                        struct sta_info *sta,
 172                                        struct hostap_sta_driver_data *data)
 173 {
 174         if (hostapd_drv_read_sta_data(hapd, data, sta->addr))
 175                 return -1;
 176
 177         if (!data->bytes_64bit) {
 178                 /* Extend 32-bit counters from the driver to 64-bit counters */
 179                 if (sta->last_rx_bytes_lo > data->rx_bytes)
 180                         sta->last_rx_bytes_hi++;
 181                 sta->last_rx_bytes_lo = data->rx_bytes;
 182
 183                 if (sta->last_tx_bytes_lo > data->tx_bytes)
 184                         sta->last_tx_bytes_hi++;
 185                 sta->last_tx_bytes_lo = data->tx_bytes;
 186         }
 187
 188         hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_RADIUS,
 189                        HOSTAPD_LEVEL_DEBUG,
 190                        "updated TX/RX stats: rx_bytes=%llu [%u:%u] tx_bytes=%llu [%u:%u] bytes_64bit=%d",
 191                        data->rx_bytes, sta->last_rx_bytes_hi,
 192                        sta->last_rx_bytes_lo,
 193                        data->tx_bytes, sta->last_tx_bytes_hi,
 194                        sta->last_tx_bytes_lo,
 195                        data->bytes_64bit);
 196
 197         return 0;
 198 }
 199
 200
 201 static void accounting_interim_update(void *eloop_ctx, void *timeout_ctx)
 202 {
 203         struct hostapd_data *hapd = eloop_ctx;
 204         struct sta_info *sta = timeout_ctx;
 205         int interval;
 206
 207         if (sta->acct_interim_interval) {
 208                 accounting_sta_interim(hapd, sta);
 209                 interval = sta->acct_interim_interval;
 210         } else {
 211                 struct hostap_sta_driver_data data;
 212                 accounting_sta_update_stats(hapd, sta, &data);
 213                 interval = ACCT_DEFAULT_UPDATE_INTERVAL;
 214         }
 215
 216         eloop_register_timeout(interval, 0, accounting_interim_update,
 217                                hapd, sta);
 218 }
 219
 220
 221 /**
 222  * accounting_sta_start - Start STA accounting
 223  * @hapd: hostapd BSS data
 224  * @sta: The station
 225  */
 226 void accounting_sta_start(struct hostapd_data *hapd, struct sta_info *sta)
 227 {
 228         struct radius_msg *msg;
 229         int interval;
 230
 231         if (sta->acct_session_started)
 232                 return;
 233
 234         hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_RADIUS,
 235                        HOSTAPD_LEVEL_INFO,
 236                        "starting accounting session %016llX",
 237                        (unsigned long long) sta->acct_session_id);
 238
 239         os_get_reltime(&sta->acct_session_start);
 240         sta->last_rx_bytes_hi = 0;
 241         sta->last_rx_bytes_lo = 0;
 242         sta->last_tx_bytes_hi = 0;
 243         sta->last_tx_bytes_lo = 0;
 244         hostapd_drv_sta_clear_stats(hapd, sta->addr);
 245
 246         if (!hapd->conf->radius->acct_server)
 247                 return;
 248
 249         if (sta->acct_interim_interval)
 250                 interval = sta->acct_interim_interval;
 251         else
 252                 interval = ACCT_DEFAULT_UPDATE_INTERVAL;
 253         eloop_register_timeout(interval, 0, accounting_interim_update,
 254                                hapd, sta);
 255
 256         msg = accounting_msg(hapd, sta, RADIUS_ACCT_STATUS_TYPE_START);
 257         if (msg &&
 258             radius_client_send(hapd->radius, msg, RADIUS_ACCT, sta->addr) < 0)
 259                 radius_msg_free(msg);
 260
 261         sta->acct_session_started = 1;
 262 }
 263
 264
 265 static void accounting_sta_report(struct hostapd_data *hapd,
 266                                   struct sta_info *sta, int stop)
 267 {
 268         struct radius_msg *msg;
 269         int cause = sta->acct_terminate_cause;
 270         struct hostap_sta_driver_data data;
 271         struct os_reltime now_r, diff;
 272         u64 bytes;
 273
 274         if (!hapd->conf->radius->acct_server)
 275                 return;
 276
 277         msg = accounting_msg(hapd, sta,
 278                              stop ? RADIUS_ACCT_STATUS_TYPE_STOP :
 279                              RADIUS_ACCT_STATUS_TYPE_INTERIM_UPDATE);
 280         if (!msg) {
 281                 wpa_printf(MSG_INFO, "Could not create RADIUS Accounting message");
 282                 return;
 283         }
 284
 285         os_get_reltime(&now_r);
 286         os_reltime_sub(&now_r, &sta->acct_session_start, &diff);
 287         if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_ACCT_SESSION_TIME,
 288                                        diff.sec)) {
 289                 wpa_printf(MSG_INFO, "Could not add Acct-Session-Time");
 290                 goto fail;
 291         }
 292
 293         if (accounting_sta_update_stats(hapd, sta, &data) == 0) {
 294                 if (!radius_msg_add_attr_int32(msg,
 295                                                RADIUS_ATTR_ACCT_INPUT_PACKETS,
 296                                                data.rx_packets)) {
 297                         wpa_printf(MSG_INFO, "Could not add Acct-Input-Packets");
 298                         goto fail;
 299                 }
 300                 if (!radius_msg_add_attr_int32(msg,
 301                                                RADIUS_ATTR_ACCT_OUTPUT_PACKETS,
 302                                                data.tx_packets)) {
 303                         wpa_printf(MSG_INFO, "Could not add Acct-Output-Packets");
 304                         goto fail;
 305                 }
 306                 if (data.bytes_64bit)
 307                         bytes = data.rx_bytes;
 308                 else
 309                         bytes = ((u64) sta->last_rx_bytes_hi << 32) |
 310                                 sta->last_rx_bytes_lo;
 311                 if (!radius_msg_add_attr_int32(msg,
 312                                                RADIUS_ATTR_ACCT_INPUT_OCTETS,
 313                                                (u32) bytes)) {
 314                         wpa_printf(MSG_INFO, "Could not add Acct-Input-Octets");
 315                         goto fail;
 316                 }
 317                 if (!radius_msg_add_attr_int32(msg,
 318                                                RADIUS_ATTR_ACCT_INPUT_GIGAWORDS,
 319                                                (u32) (bytes >> 32))) {
 320                         wpa_printf(MSG_INFO, "Could not add Acct-Input-Gigawords");
 321                         goto fail;
 322                 }
 323                 if (data.bytes_64bit)
 324                         bytes = data.tx_bytes;
 325                 else
 326                         bytes = ((u64) sta->last_tx_bytes_hi << 32) |
 327                                 sta->last_tx_bytes_lo;
 328                 if (!radius_msg_add_attr_int32(msg,
 329                                                RADIUS_ATTR_ACCT_OUTPUT_OCTETS,
 330                                                (u32) bytes)) {
 331                         wpa_printf(MSG_INFO, "Could not add Acct-Output-Octets");
 332                         goto fail;
 333                 }
 334                 if (!radius_msg_add_attr_int32(msg,
 335                                                RADIUS_ATTR_ACCT_OUTPUT_GIGAWORDS,
 336                                                (u32) (bytes >> 32))) {
 337                         wpa_printf(MSG_INFO, "Could not add Acct-Output-Gigawords");
 338                         goto fail;
 339                 }
 340         }
 341
 342         if (eloop_terminated())
 343                 cause = RADIUS_ACCT_TERMINATE_CAUSE_ADMIN_REBOOT;
 344
 345         if (stop && cause &&
 346             !radius_msg_add_attr_int32(msg, RADIUS_ATTR_ACCT_TERMINATE_CAUSE,
 347                                        cause)) {
 348                 wpa_printf(MSG_INFO, "Could not add Acct-Terminate-Cause");
 349                 goto fail;
 350         }
 351
 352         if (radius_client_send(hapd->radius, msg,
 353                                stop ? RADIUS_ACCT : RADIUS_ACCT_INTERIM,
 354                                sta->addr) < 0)
 355                 goto fail;
 356         return;
 357
 358  fail:
 359         radius_msg_free(msg);
 360 }
 361
 362
 363 /**
 364  * accounting_sta_interim - Send a interim STA accounting report
 365  * @hapd: hostapd BSS data
 366  * @sta: The station
 367  */
 368 static void accounting_sta_interim(struct hostapd_data *hapd,
 369                                    struct sta_info *sta)
 370 {
 371         if (sta->acct_session_started)
 372                 accounting_sta_report(hapd, sta, 0);
 373 }
 374
 375
 376 /**
 377  * accounting_sta_stop - Stop STA accounting
 378  * @hapd: hostapd BSS data
 379  * @sta: The station
 380  */
 381 void accounting_sta_stop(struct hostapd_data *hapd, struct sta_info *sta)
 382 {
 383         if (sta->acct_session_started) {
 384                 accounting_sta_report(hapd, sta, 1);
 385                 eloop_cancel_timeout(accounting_interim_update, hapd, sta);
 386                 hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_RADIUS,
 387                                HOSTAPD_LEVEL_INFO,
 388                                "stopped accounting session %016llX",
 389                                (unsigned long long) sta->acct_session_id);
 390                 sta->acct_session_started = 0;
 391         }
 392 }
 393
 394
 395 int accounting_sta_get_id(struct hostapd_data *hapd, struct sta_info *sta)
 396 {
 397         return radius_gen_session_id((u8 *) &sta->acct_session_id,
 398                                      sizeof(sta->acct_session_id));
 399 }
 400
 401
 402 /**
 403  * accounting_receive - Process the RADIUS frames from Accounting Server
 404  * @msg: RADIUS response message
 405  * @req: RADIUS request message
 406  * @shared_secret: RADIUS shared secret
 407  * @shared_secret_len: Length of shared_secret in octets
 408  * @data: Context data (struct hostapd_data *)
 409  * Returns: Processing status
 410  */
 411 static RadiusRxResult
 412 accounting_receive(struct radius_msg *msg, struct radius_msg *req,
 413                    const u8 *shared_secret, size_t shared_secret_len,
 414                    void *data)
 415 {
 416         if (radius_msg_get_hdr(msg)->code != RADIUS_CODE_ACCOUNTING_RESPONSE) {
 417                 wpa_printf(MSG_INFO, "Unknown RADIUS message code");
 418                 return RADIUS_RX_UNKNOWN;
 419         }
 420
 421         if (radius_msg_verify(msg, shared_secret, shared_secret_len, req, 0)) {
 422                 wpa_printf(MSG_INFO, "Incoming RADIUS packet did not have correct Authenticator - dropped");
 423                 return RADIUS_RX_INVALID_AUTHENTICATOR;
 424         }
 425
 426         return RADIUS_RX_PROCESSED;
 427 }
 428
 429
 430 static void accounting_report_state(struct hostapd_data *hapd, int on)
 431 {
 432         struct radius_msg *msg;
 433
 434         if (!hapd->conf->radius->acct_server || hapd->radius == NULL)
 435                 return;
 436
 437         /* Inform RADIUS server that accounting will start/stop so that the
 438          * server can close old accounting sessions. */
 439         msg = accounting_msg(hapd, NULL,
 440                              on ? RADIUS_ACCT_STATUS_TYPE_ACCOUNTING_ON :
 441                              RADIUS_ACCT_STATUS_TYPE_ACCOUNTING_OFF);
 442         if (!msg)
 443                 return;
 444
 445         if (hapd->acct_session_id) {
 446                 char buf[20];
 447
 448                 os_snprintf(buf, sizeof(buf), "%016llX",
 449                             (unsigned long long) hapd->acct_session_id);
 450                 if (!radius_msg_add_attr(msg, RADIUS_ATTR_ACCT_SESSION_ID,
 451                                          (u8 *) buf, os_strlen(buf)))
 452                         wpa_printf(MSG_ERROR, "Could not add Acct-Session-Id");
 453         }
 454
 455         if (radius_client_send(hapd->radius, msg, RADIUS_ACCT, NULL) < 0)
 456                 radius_msg_free(msg);
 457 }
 458
 459
 460 static void accounting_interim_error_cb(const u8 *addr, void *ctx)
 461 {
 462         struct hostapd_data *hapd = ctx;
 463         struct sta_info *sta;
 464         unsigned int i, wait_time;
 465         int res;
 466
 467         sta = ap_get_sta(hapd, addr);
 468         if (!sta)
 469                 return;
 470         sta->acct_interim_errors++;
 471         if (sta->acct_interim_errors > 10 /* RADIUS_CLIENT_MAX_RETRIES */) {
 472                 wpa_printf(MSG_DEBUG,
 473                            "Interim RADIUS accounting update failed for " MACSTR
 474                            " - too many errors, abandon this interim accounting update",
 475                            MAC2STR(addr));
 476                 sta->acct_interim_errors = 0;
 477                 /* Next update will be tried after normal update interval */
 478                 return;
 479         }
 480
 481         /*
 482          * Use a shorter update interval as an improved retransmission mechanism
 483          * for failed interim accounting updates. This allows the statistics to
 484          * be updated for each retransmission.
 485          *
 486          * RADIUS client code has already waited RADIUS_CLIENT_FIRST_WAIT.
 487          * Schedule the first retry attempt immediately and every following one
 488          * with exponential backoff.
 489          */
 490         if (sta->acct_interim_errors == 1) {
 491                 wait_time = 0;
 492         } else {
 493                 wait_time = 3; /* RADIUS_CLIENT_FIRST_WAIT */
 494                 for (i = 1; i < sta->acct_interim_errors; i++)
 495                         wait_time *= 2;
 496         }
 497         res = eloop_deplete_timeout(wait_time, 0, accounting_interim_update,
 498                                     hapd, sta);
 499         if (res == 1)
 500                 wpa_printf(MSG_DEBUG,
 501                            "Interim RADIUS accounting update failed for " MACSTR
 502                            " (error count: %u) - schedule next update in %u seconds",
 503                            MAC2STR(addr), sta->acct_interim_errors, wait_time);
 504         else if (res == 0)
 505                 wpa_printf(MSG_DEBUG,
 506                            "Interim RADIUS accounting update failed for " MACSTR
 507                            " (error count: %u)", MAC2STR(addr),
 508                            sta->acct_interim_errors);
 509         else
 510                 wpa_printf(MSG_DEBUG,
 511                            "Interim RADIUS accounting update failed for " MACSTR
 512                            " (error count: %u) - no timer found", MAC2STR(addr),
 513                            sta->acct_interim_errors);
 514 }
 515
 516
 517 /**
 518  * accounting_init: Initialize accounting
 519  * @hapd: hostapd BSS data
 520  * Returns: 0 on success, -1 on failure
 521  */
 522 int accounting_init(struct hostapd_data *hapd)
 523 {
 524         if (radius_gen_session_id((u8 *) &hapd->acct_session_id,
 525                                   sizeof(hapd->acct_session_id)) < 0)
 526                 return -1;
 527
 528         if (radius_client_register(hapd->radius, RADIUS_ACCT,
 529                                    accounting_receive, hapd))
 530                 return -1;
 531         radius_client_set_interim_error_cb(hapd->radius,
 532                                            accounting_interim_error_cb, hapd);
 533
 534         accounting_report_state(hapd, 1);
 535
 536         return 0;
 537 }
 538
 539
 540 /**
 541  * accounting_deinit: Deinitialize accounting
 542  * @hapd: hostapd BSS data
 543  */
 544 void accounting_deinit(struct hostapd_data *hapd)
 545 {
 546         accounting_report_state(hapd, 0);
 547 }