wpa_supplicant/wpa_priv.c

   1 /*
   2  * WPA Supplicant / privileged helper program
   3  * Copyright (c) 2007-2009, 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 "includes.h"
  10 #ifdef __linux__
  11 #include <fcntl.h>
  12 #endif /* __linux__ */
  13 #include <sys/un.h>
  14 #include <sys/stat.h>
  15
  16 #include "common.h"
  17 #include "eloop.h"
  18 #include "common/version.h"
  19 #include "drivers/driver.h"
  20 #include "l2_packet/l2_packet.h"
  21 #include "common/privsep_commands.h"
  22 #include "common/ieee802_11_defs.h"
  23
  24 #define WPA_PRIV_MAX_L2 3
  25
  26 struct wpa_priv_interface {
  27         struct wpa_priv_interface *next;
  28         char *driver_name;
  29         char *ifname;
  30         char *sock_name;
  31         int fd;
  32
  33         void *ctx;
  34
  35         const struct wpa_driver_ops *driver;
  36         void *drv_priv;
  37         void *drv_global_priv;
  38         struct sockaddr_un drv_addr;
  39         socklen_t drv_addr_len;
  40         int wpas_registered;
  41
  42         struct l2_packet_data *l2[WPA_PRIV_MAX_L2];
  43         struct sockaddr_un l2_addr[WPA_PRIV_MAX_L2];
  44         socklen_t l2_addr_len[WPA_PRIV_MAX_L2];
  45         struct wpa_priv_l2 {
  46                 struct wpa_priv_interface *parent;
  47                 int idx;
  48         } l2_ctx[WPA_PRIV_MAX_L2];
  49 };
  50
  51 struct wpa_priv_global {
  52         struct wpa_priv_interface *interfaces;
  53 };
  54
  55
  56 static void wpa_priv_cmd_register(struct wpa_priv_interface *iface,
  57                                   struct sockaddr_un *from, socklen_t fromlen)
  58 {
  59         int i;
  60
  61         if (iface->drv_priv) {
  62                 wpa_printf(MSG_DEBUG, "Cleaning up forgotten driver instance");
  63                 if (iface->driver->deinit)
  64                         iface->driver->deinit(iface->drv_priv);
  65                 iface->drv_priv = NULL;
  66                 if (iface->drv_global_priv) {
  67                         iface->driver->global_deinit(iface->drv_global_priv);
  68                         iface->drv_global_priv = NULL;
  69                 }
  70                 iface->wpas_registered = 0;
  71         }
  72
  73         for (i = 0; i < WPA_PRIV_MAX_L2; i++) {
  74                 if (iface->l2[i]) {
  75                         wpa_printf(MSG_DEBUG,
  76                                    "Cleaning up forgotten l2_packet instance");
  77                         l2_packet_deinit(iface->l2[i]);
  78                         iface->l2[i] = NULL;
  79                 }
  80         }
  81
  82         if (iface->driver->init2) {
  83                 if (iface->driver->global_init) {
  84                         iface->drv_global_priv =
  85                                 iface->driver->global_init(iface->ctx);
  86                         if (!iface->drv_global_priv) {
  87                                 wpa_printf(MSG_INFO,
  88                                            "Failed to initialize driver global context");
  89                                 return;
  90                         }
  91                 } else {
  92                         iface->drv_global_priv = NULL;
  93                 }
  94                 iface->drv_priv = iface->driver->init2(iface, iface->ifname,
  95                                                        iface->drv_global_priv);
  96         } else if (iface->driver->init) {
  97                 iface->drv_priv = iface->driver->init(iface, iface->ifname);
  98         } else {
  99                 return;
 100         }
 101         if (iface->drv_priv == NULL) {
 102                 wpa_printf(MSG_DEBUG, "Failed to initialize driver wrapper");
 103                 return;
 104         }
 105
 106         wpa_printf(MSG_DEBUG, "Driver wrapper '%s' initialized for interface "
 107                    "'%s'", iface->driver_name, iface->ifname);
 108
 109         os_memcpy(&iface->drv_addr, from, fromlen);
 110         iface->drv_addr_len = fromlen;
 111         iface->wpas_registered = 1;
 112
 113         if (iface->driver->set_param &&
 114             iface->driver->set_param(iface->drv_priv, NULL) < 0) {
 115                 wpa_printf(MSG_ERROR, "Driver interface rejected param");
 116         }
 117 }
 118
 119
 120 static void wpa_priv_cmd_unregister(struct wpa_priv_interface *iface,
 121                                     struct sockaddr_un *from)
 122 {
 123         if (iface->drv_priv) {
 124                 if (iface->driver->deinit)
 125                         iface->driver->deinit(iface->drv_priv);
 126                 iface->drv_priv = NULL;
 127                 if (iface->drv_global_priv) {
 128                         iface->driver->global_deinit(iface->drv_global_priv);
 129                         iface->drv_global_priv = NULL;
 130                 }
 131                 iface->wpas_registered = 0;
 132         }
 133 }
 134
 135
 136 static void wpa_priv_cmd_scan(struct wpa_priv_interface *iface,
 137                               void *buf, size_t len)
 138 {
 139         struct wpa_driver_scan_params params;
 140         struct privsep_cmd_scan *scan;
 141         unsigned int i;
 142         int freqs[PRIVSEP_MAX_SCAN_FREQS + 1];
 143
 144         if (iface->drv_priv == NULL)
 145                 return;
 146
 147         if (len < sizeof(*scan)) {
 148                 wpa_printf(MSG_DEBUG, "Invalid scan request");
 149                 return;
 150         }
 151
 152         scan = buf;
 153
 154         os_memset(&params, 0, sizeof(params));
 155         if (scan->num_ssids > WPAS_MAX_SCAN_SSIDS) {
 156                 wpa_printf(MSG_DEBUG, "Invalid scan request (num_ssids)");
 157                 return;
 158         }
 159         params.num_ssids = scan->num_ssids;
 160         for (i = 0; i < scan->num_ssids; i++) {
 161                 params.ssids[i].ssid = scan->ssids[i];
 162                 params.ssids[i].ssid_len = scan->ssid_lens[i];
 163         }
 164
 165         if (scan->num_freqs > PRIVSEP_MAX_SCAN_FREQS) {
 166                 wpa_printf(MSG_DEBUG, "Invalid scan request (num_freqs)");
 167                 return;
 168         }
 169         if (scan->num_freqs) {
 170                 for (i = 0; i < scan->num_freqs; i++)
 171                         freqs[i] = scan->freqs[i];
 172                 freqs[i] = 0;
 173                 params.freqs = freqs;
 174         }
 175
 176         if (iface->driver->scan2)
 177                 iface->driver->scan2(iface->drv_priv, &params);
 178 }
 179
 180
 181 static void wpa_priv_get_scan_results2(struct wpa_priv_interface *iface,
 182                                        struct sockaddr_un *from,
 183                                        socklen_t fromlen)
 184 {
 185         struct wpa_scan_results *res;
 186         u8 *buf = NULL, *pos, *end;
 187         int val;
 188         size_t i;
 189
 190         res = iface->driver->get_scan_results2(iface->drv_priv);
 191         if (res == NULL)
 192                 goto fail;
 193
 194         buf = os_malloc(60000);
 195         if (buf == NULL)
 196                 goto fail;
 197         pos = buf;
 198         end = buf + 60000;
 199         val = res->num;
 200         os_memcpy(pos, &val, sizeof(int));
 201         pos += sizeof(int);
 202
 203         for (i = 0; i < res->num; i++) {
 204                 struct wpa_scan_res *r = res->res[i];
 205                 val = sizeof(*r) + r->ie_len + r->beacon_ie_len;
 206                 if (end - pos < (int) sizeof(int) + val)
 207                         break;
 208                 os_memcpy(pos, &val, sizeof(int));
 209                 pos += sizeof(int);
 210                 os_memcpy(pos, r, val);
 211                 pos += val;
 212         }
 213
 214         sendto(iface->fd, buf, pos - buf, 0, (struct sockaddr *) from, fromlen);
 215
 216         os_free(buf);
 217         wpa_scan_results_free(res);
 218         return;
 219
 220 fail:
 221         os_free(buf);
 222         wpa_scan_results_free(res);
 223         sendto(iface->fd, "", 0, 0, (struct sockaddr *) from, fromlen);
 224 }
 225
 226
 227 static void wpa_priv_cmd_get_scan_results(struct wpa_priv_interface *iface,
 228                                           struct sockaddr_un *from,
 229                                           socklen_t fromlen)
 230 {
 231         if (iface->drv_priv == NULL)
 232                 return;
 233
 234         if (iface->driver->get_scan_results2)
 235                 wpa_priv_get_scan_results2(iface, from, fromlen);
 236         else
 237                 sendto(iface->fd, "", 0, 0, (struct sockaddr *) from, fromlen);
 238 }
 239
 240
 241 static void wpa_priv_cmd_authenticate(struct wpa_priv_interface *iface,
 242                                       void *buf, size_t len)
 243 {
 244         struct wpa_driver_auth_params params;
 245         struct privsep_cmd_authenticate *auth;
 246         int res, i;
 247
 248         if (iface->drv_priv == NULL || iface->driver->authenticate == NULL)
 249                 return;
 250
 251         if (len < sizeof(*auth)) {
 252                 wpa_printf(MSG_DEBUG, "Invalid authentication request");
 253                 return;
 254         }
 255
 256         auth = buf;
 257         if (sizeof(*auth) + auth->ie_len + auth->auth_data_len > len) {
 258                 wpa_printf(MSG_DEBUG, "Authentication request overflow");
 259                 return;
 260         }
 261
 262         os_memset(&params, 0, sizeof(params));
 263         params.freq = auth->freq;
 264         params.bssid = auth->bssid;
 265         params.ssid = auth->ssid;
 266         if (auth->ssid_len > SSID_MAX_LEN)
 267                 return;
 268         params.ssid_len = auth->ssid_len;
 269         params.auth_alg = auth->auth_alg;
 270         for (i = 0; i < 4; i++) {
 271                 if (auth->wep_key_len[i]) {
 272                         params.wep_key[i] = auth->wep_key[i];
 273                         params.wep_key_len[i] = auth->wep_key_len[i];
 274                 }
 275         }
 276         params.wep_tx_keyidx = auth->wep_tx_keyidx;
 277         params.local_state_change = auth->local_state_change;
 278         params.p2p = auth->p2p;
 279         if (auth->ie_len) {
 280                 params.ie = (u8 *) (auth + 1);
 281                 params.ie_len = auth->ie_len;
 282         }
 283         if (auth->auth_data_len) {
 284                 params.auth_data = ((u8 *) (auth + 1)) + auth->ie_len;
 285                 params.auth_data_len = auth->auth_data_len;
 286         }
 287
 288         res = iface->driver->authenticate(iface->drv_priv, &params);
 289         wpa_printf(MSG_DEBUG, "drv->authenticate: res=%d", res);
 290 }
 291
 292
 293 static void wpa_priv_cmd_associate(struct wpa_priv_interface *iface,
 294                                    void *buf, size_t len)
 295 {
 296         struct wpa_driver_associate_params params;
 297         struct privsep_cmd_associate *assoc;
 298         u8 *bssid;
 299         int res;
 300
 301         if (iface->drv_priv == NULL || iface->driver->associate == NULL)
 302                 return;
 303
 304         if (len < sizeof(*assoc)) {
 305                 wpa_printf(MSG_DEBUG, "Invalid association request");
 306                 return;
 307         }
 308
 309         assoc = buf;
 310         if (sizeof(*assoc) + assoc->wpa_ie_len > len) {
 311                 wpa_printf(MSG_DEBUG, "Association request overflow");
 312                 return;
 313         }
 314
 315         os_memset(&params, 0, sizeof(params));
 316         bssid = assoc->bssid;
 317         if (bssid[0] | bssid[1] | bssid[2] | bssid[3] | bssid[4] | bssid[5])
 318                 params.bssid = bssid;
 319         params.ssid = assoc->ssid;
 320         if (assoc->ssid_len > SSID_MAX_LEN)
 321                 return;
 322         params.ssid_len = assoc->ssid_len;
 323         params.freq.mode = assoc->hwmode;
 324         params.freq.freq = assoc->freq;
 325         params.freq.channel = assoc->channel;
 326         if (assoc->wpa_ie_len) {
 327                 params.wpa_ie = (u8 *) (assoc + 1);
 328                 params.wpa_ie_len = assoc->wpa_ie_len;
 329         }
 330         params.pairwise_suite = assoc->pairwise_suite;
 331         params.group_suite = assoc->group_suite;
 332         params.key_mgmt_suite = assoc->key_mgmt_suite;
 333         params.auth_alg = assoc->auth_alg;
 334         params.mode = assoc->mode;
 335
 336         res = iface->driver->associate(iface->drv_priv, &params);
 337         wpa_printf(MSG_DEBUG, "drv->associate: res=%d", res);
 338 }
 339
 340
 341 static void wpa_priv_cmd_get_bssid(struct wpa_priv_interface *iface,
 342                                    struct sockaddr_un *from, socklen_t fromlen)
 343 {
 344         u8 bssid[ETH_ALEN];
 345
 346         if (iface->drv_priv == NULL)
 347                 goto fail;
 348
 349         if (iface->driver->get_bssid == NULL ||
 350             iface->driver->get_bssid(iface->drv_priv, bssid) < 0)
 351                 goto fail;
 352
 353         sendto(iface->fd, bssid, ETH_ALEN, 0, (struct sockaddr *) from,
 354                fromlen);
 355         return;
 356
 357 fail:
 358         sendto(iface->fd, "", 0, 0, (struct sockaddr *) from, fromlen);
 359 }
 360
 361
 362 static void wpa_priv_cmd_get_ssid(struct wpa_priv_interface *iface,
 363                                   struct sockaddr_un *from, socklen_t fromlen)
 364 {
 365         u8 ssid[sizeof(int) + SSID_MAX_LEN];
 366         int res;
 367
 368         if (iface->drv_priv == NULL)
 369                 goto fail;
 370
 371         if (iface->driver->get_ssid == NULL)
 372                 goto fail;
 373
 374         os_memset(ssid, 0, sizeof(ssid));
 375         res = iface->driver->get_ssid(iface->drv_priv, &ssid[sizeof(int)]);
 376         if (res < 0 || res > SSID_MAX_LEN)
 377                 goto fail;
 378         os_memcpy(ssid, &res, sizeof(int));
 379
 380         sendto(iface->fd, ssid, sizeof(ssid), 0, (struct sockaddr *) from,
 381                fromlen);
 382         return;
 383
 384 fail:
 385         sendto(iface->fd, "", 0, 0, (struct sockaddr *) from, fromlen);
 386 }
 387
 388
 389 static void wpa_priv_cmd_set_key(struct wpa_priv_interface *iface,
 390                                  void *buf, size_t len)
 391 {
 392         struct privsep_cmd_set_key *params;
 393         int res;
 394
 395         if (iface->drv_priv == NULL || iface->driver->set_key == NULL)
 396                 return;
 397
 398         if (len != sizeof(*params)) {
 399                 wpa_printf(MSG_DEBUG, "Invalid set_key request");
 400                 return;
 401         }
 402
 403         params = buf;
 404
 405         res = iface->driver->set_key(iface->ifname, iface->drv_priv,
 406                                      params->alg,
 407                                      params->addr, params->key_idx,
 408                                      params->set_tx,
 409                                      params->seq_len ? params->seq : NULL,
 410                                      params->seq_len,
 411                                      params->key_len ? params->key : NULL,
 412                                      params->key_len);
 413         wpa_printf(MSG_DEBUG, "drv->set_key: res=%d", res);
 414 }
 415
 416
 417 static void wpa_priv_cmd_get_capa(struct wpa_priv_interface *iface,
 418                                   struct sockaddr_un *from, socklen_t fromlen)
 419 {
 420         struct wpa_driver_capa capa;
 421
 422         if (iface->drv_priv == NULL)
 423                 goto fail;
 424
 425         if (iface->driver->get_capa == NULL ||
 426             iface->driver->get_capa(iface->drv_priv, &capa) < 0)
 427                 goto fail;
 428
 429         /* For now, no support for passing extended_capa pointers */
 430         capa.extended_capa = NULL;
 431         capa.extended_capa_mask = NULL;
 432         capa.extended_capa_len = 0;
 433         sendto(iface->fd, &capa, sizeof(capa), 0, (struct sockaddr *) from,
 434                fromlen);
 435         return;
 436
 437 fail:
 438         sendto(iface->fd, "", 0, 0, (struct sockaddr *) from, fromlen);
 439 }
 440
 441
 442 static void wpa_priv_l2_rx(void *ctx, const u8 *src_addr, const u8 *buf,
 443                            size_t len)
 444 {
 445         struct wpa_priv_l2 *l2_ctx = ctx;
 446         struct wpa_priv_interface *iface = l2_ctx->parent;
 447         struct msghdr msg;
 448         struct iovec io[2];
 449
 450         io[0].iov_base = (u8 *) src_addr;
 451         io[0].iov_len = ETH_ALEN;
 452         io[1].iov_base = (u8 *) buf;
 453         io[1].iov_len = len;
 454
 455         os_memset(&msg, 0, sizeof(msg));
 456         msg.msg_iov = io;
 457         msg.msg_iovlen = 2;
 458         msg.msg_name = &iface->l2_addr[l2_ctx->idx];
 459         msg.msg_namelen = iface->l2_addr_len[l2_ctx->idx];
 460
 461         if (sendmsg(iface->fd, &msg, 0) < 0) {
 462                 wpa_printf(MSG_ERROR, "sendmsg(l2 rx): %s", strerror(errno));
 463         }
 464 }
 465
 466
 467 static int wpa_priv_allowed_l2_proto(u16 proto)
 468 {
 469         return proto == ETH_P_EAPOL || proto == ETH_P_RSN_PREAUTH ||
 470                 proto == ETH_P_80211_ENCAP;
 471 }
 472
 473
 474 static void wpa_priv_cmd_l2_register(struct wpa_priv_interface *iface,
 475                                      struct sockaddr_un *from,
 476                                      socklen_t fromlen,
 477                                      void *buf, size_t len)
 478 {
 479         int *reg_cmd = buf;
 480         u8 own_addr[ETH_ALEN];
 481         int res;
 482         u16 proto;
 483         int idx;
 484
 485         if (len != 2 * sizeof(int)) {
 486                 wpa_printf(MSG_DEBUG, "Invalid l2_register length %lu",
 487                            (unsigned long) len);
 488                 return;
 489         }
 490
 491         proto = reg_cmd[0];
 492         if (!wpa_priv_allowed_l2_proto(proto)) {
 493                 wpa_printf(MSG_DEBUG, "Refused l2_packet connection for "
 494                            "ethertype 0x%x", proto);
 495                 return;
 496         }
 497
 498         for (idx = 0; idx < WPA_PRIV_MAX_L2; idx++) {
 499                 if (!iface->l2[idx])
 500                         break;
 501         }
 502         if (idx == WPA_PRIV_MAX_L2) {
 503                 wpa_printf(MSG_DEBUG, "No free l2_packet connection found");
 504                 return;
 505         }
 506
 507         os_memcpy(&iface->l2_addr[idx], from, fromlen);
 508         iface->l2_addr_len[idx] = fromlen;
 509
 510         iface->l2_ctx[idx].idx = idx;
 511         iface->l2_ctx[idx].parent = iface;
 512         iface->l2[idx] = l2_packet_init(iface->ifname, NULL, proto,
 513                                         wpa_priv_l2_rx, &iface->l2_ctx[idx],
 514                                         reg_cmd[1]);
 515         if (!iface->l2[idx]) {
 516                 wpa_printf(MSG_DEBUG, "Failed to initialize l2_packet "
 517                            "instance for protocol %d", proto);
 518                 return;
 519         }
 520
 521         if (l2_packet_get_own_addr(iface->l2[idx], own_addr) < 0) {
 522                 wpa_printf(MSG_DEBUG, "Failed to get own address from "
 523                            "l2_packet");
 524                 l2_packet_deinit(iface->l2[idx]);
 525                 iface->l2[idx] = NULL;
 526                 return;
 527         }
 528
 529         res = sendto(iface->fd, own_addr, ETH_ALEN, 0,
 530                      (struct sockaddr *) from, fromlen);
 531         wpa_printf(MSG_DEBUG, "L2 registration[idx=%d]: res=%d", idx, res);
 532 }
 533
 534
 535 static void wpa_priv_cmd_l2_unregister(struct wpa_priv_interface *iface,
 536                                        struct sockaddr_un *from,
 537                                        socklen_t fromlen)
 538 {
 539         int idx;
 540
 541         for (idx = 0; idx < WPA_PRIV_MAX_L2; idx++) {
 542                 if (iface->l2_addr_len[idx] == fromlen &&
 543                     os_memcmp(&iface->l2_addr[idx], from, fromlen) == 0)
 544                         break;
 545         }
 546         if (idx == WPA_PRIV_MAX_L2) {
 547                 wpa_printf(MSG_DEBUG,
 548                            "No registered l2_packet socket found for unregister request");
 549                 return;
 550         }
 551
 552         if (iface->l2[idx]) {
 553                 l2_packet_deinit(iface->l2[idx]);
 554                 iface->l2[idx] = NULL;
 555         }
 556 }
 557
 558
 559 static void wpa_priv_cmd_l2_notify_auth_start(struct wpa_priv_interface *iface,
 560                                               struct sockaddr_un *from)
 561 {
 562         int idx;
 563
 564         for (idx = 0; idx < WPA_PRIV_MAX_L2; idx++) {
 565                 if (iface->l2[idx])
 566                         l2_packet_notify_auth_start(iface->l2[idx]);
 567         }
 568 }
 569
 570
 571 static void wpa_priv_cmd_l2_send(struct wpa_priv_interface *iface,
 572                                  struct sockaddr_un *from, socklen_t fromlen,
 573                                  void *buf, size_t len)
 574 {
 575         u8 *dst_addr;
 576         u16 proto;
 577         int res;
 578         int idx;
 579
 580         for (idx = 0; idx < WPA_PRIV_MAX_L2; idx++) {
 581                 if (iface->l2_addr_len[idx] == fromlen &&
 582                     os_memcmp(&iface->l2_addr[idx], from, fromlen) == 0)
 583                         break;
 584         }
 585         if (idx == WPA_PRIV_MAX_L2) {
 586                 wpa_printf(MSG_DEBUG,
 587                            "No registered l2_packet socket found for send request");
 588                 return;
 589         }
 590
 591         if (iface->l2[idx] == NULL)
 592                 return;
 593
 594         if (len < ETH_ALEN + 2) {
 595                 wpa_printf(MSG_DEBUG, "Too short L2 send packet (len=%lu)",
 596                            (unsigned long) len);
 597                 return;
 598         }
 599
 600         dst_addr = buf;
 601         os_memcpy(&proto, buf + ETH_ALEN, 2);
 602
 603         if (!wpa_priv_allowed_l2_proto(proto)) {
 604                 wpa_printf(MSG_DEBUG, "Refused l2_packet send for ethertype "
 605                            "0x%x", proto);
 606                 return;
 607         }
 608
 609         res = l2_packet_send(iface->l2[idx], dst_addr, proto,
 610                              buf + ETH_ALEN + 2, len - ETH_ALEN - 2);
 611         wpa_printf(MSG_DEBUG, "L2 send[idx=%d]: res=%d", idx, res);
 612 }
 613
 614
 615 static void wpa_priv_cmd_set_country(struct wpa_priv_interface *iface,
 616                                      char *buf)
 617 {
 618         if (iface->drv_priv == NULL || iface->driver->set_country == NULL ||
 619             *buf == '\0')
 620                 return;
 621
 622         iface->driver->set_country(iface->drv_priv, buf);
 623 }
 624
 625
 626 static void wpa_priv_receive(int sock, void *eloop_ctx, void *sock_ctx)
 627 {
 628         struct wpa_priv_interface *iface = eloop_ctx;
 629         char buf[2000], *pos;
 630         void *cmd_buf;
 631         size_t cmd_len;
 632         int res, cmd;
 633         struct sockaddr_un from;
 634         socklen_t fromlen = sizeof(from);
 635
 636         res = recvfrom(sock, buf, sizeof(buf), 0, (struct sockaddr *) &from,
 637                        &fromlen);
 638         if (res < 0) {
 639                 wpa_printf(MSG_ERROR, "recvfrom: %s", strerror(errno));
 640                 return;
 641         }
 642
 643         if (res < (int) sizeof(int)) {
 644                 wpa_printf(MSG_DEBUG, "Too short command (len=%d)", res);
 645                 return;
 646         }
 647
 648         os_memcpy(&cmd, buf, sizeof(int));
 649         wpa_printf(MSG_DEBUG, "Command %d for interface %s",
 650                    cmd, iface->ifname);
 651         cmd_buf = &buf[sizeof(int)];
 652         cmd_len = res - sizeof(int);
 653
 654         switch (cmd) {
 655         case PRIVSEP_CMD_REGISTER:
 656                 wpa_priv_cmd_register(iface, &from, fromlen);
 657                 break;
 658         case PRIVSEP_CMD_UNREGISTER:
 659                 wpa_priv_cmd_unregister(iface, &from);
 660                 break;
 661         case PRIVSEP_CMD_SCAN:
 662                 wpa_priv_cmd_scan(iface, cmd_buf, cmd_len);
 663                 break;
 664         case PRIVSEP_CMD_GET_SCAN_RESULTS:
 665                 wpa_priv_cmd_get_scan_results(iface, &from, fromlen);
 666                 break;
 667         case PRIVSEP_CMD_ASSOCIATE:
 668                 wpa_priv_cmd_associate(iface, cmd_buf, cmd_len);
 669                 break;
 670         case PRIVSEP_CMD_GET_BSSID:
 671                 wpa_priv_cmd_get_bssid(iface, &from, fromlen);
 672                 break;
 673         case PRIVSEP_CMD_GET_SSID:
 674                 wpa_priv_cmd_get_ssid(iface, &from, fromlen);
 675                 break;
 676         case PRIVSEP_CMD_SET_KEY:
 677                 wpa_priv_cmd_set_key(iface, cmd_buf, cmd_len);
 678                 break;
 679         case PRIVSEP_CMD_GET_CAPA:
 680                 wpa_priv_cmd_get_capa(iface, &from, fromlen);
 681                 break;
 682         case PRIVSEP_CMD_L2_REGISTER:
 683                 wpa_priv_cmd_l2_register(iface, &from, fromlen,
 684                                          cmd_buf, cmd_len);
 685                 break;
 686         case PRIVSEP_CMD_L2_UNREGISTER:
 687                 wpa_priv_cmd_l2_unregister(iface, &from, fromlen);
 688                 break;
 689         case PRIVSEP_CMD_L2_NOTIFY_AUTH_START:
 690                 wpa_priv_cmd_l2_notify_auth_start(iface, &from);
 691                 break;
 692         case PRIVSEP_CMD_L2_SEND:
 693                 wpa_priv_cmd_l2_send(iface, &from, fromlen, cmd_buf, cmd_len);
 694                 break;
 695         case PRIVSEP_CMD_SET_COUNTRY:
 696                 pos = cmd_buf;
 697                 if (pos + cmd_len >= buf + sizeof(buf))
 698                         break;
 699                 pos[cmd_len] = '\0';
 700                 wpa_priv_cmd_set_country(iface, pos);
 701                 break;
 702         case PRIVSEP_CMD_AUTHENTICATE:
 703                 wpa_priv_cmd_authenticate(iface, cmd_buf, cmd_len);
 704                 break;
 705         }
 706 }
 707
 708
 709 static void wpa_priv_interface_deinit(struct wpa_priv_interface *iface)
 710 {
 711         int i;
 712
 713         if (iface->drv_priv) {
 714                 if (iface->driver->deinit)
 715                         iface->driver->deinit(iface->drv_priv);
 716                 if (iface->drv_global_priv)
 717                         iface->driver->global_deinit(iface->drv_global_priv);
 718         }
 719
 720         if (iface->fd >= 0) {
 721                 eloop_unregister_read_sock(iface->fd);
 722                 close(iface->fd);
 723                 unlink(iface->sock_name);
 724         }
 725
 726         for (i = 0; i < WPA_PRIV_MAX_L2; i++) {
 727                 if (iface->l2[i])
 728                         l2_packet_deinit(iface->l2[i]);
 729         }
 730
 731         os_free(iface->ifname);
 732         os_free(iface->driver_name);
 733         os_free(iface->sock_name);
 734         os_free(iface);
 735 }
 736
 737
 738 static struct wpa_priv_interface *
 739 wpa_priv_interface_init(void *ctx, const char *dir, const char *params)
 740 {
 741         struct wpa_priv_interface *iface;
 742         char *pos;
 743         size_t len;
 744         struct sockaddr_un addr;
 745         int i;
 746
 747         pos = os_strchr(params, ':');
 748         if (pos == NULL)
 749                 return NULL;
 750
 751         iface = os_zalloc(sizeof(*iface));
 752         if (iface == NULL)
 753                 return NULL;
 754         iface->fd = -1;
 755         iface->ctx = ctx;
 756
 757         len = pos - params;
 758         iface->driver_name = dup_binstr(params, len);
 759         if (iface->driver_name == NULL) {
 760                 wpa_priv_interface_deinit(iface);
 761                 return NULL;
 762         }
 763
 764         for (i = 0; wpa_drivers[i]; i++) {
 765                 if (os_strcmp(iface->driver_name,
 766                               wpa_drivers[i]->name) == 0) {
 767                         iface->driver = wpa_drivers[i];
 768                         break;
 769                 }
 770         }
 771         if (iface->driver == NULL) {
 772                 wpa_printf(MSG_ERROR, "Unsupported driver '%s'",
 773                            iface->driver_name);
 774                 wpa_priv_interface_deinit(iface);
 775                 return NULL;
 776         }
 777
 778         pos++;
 779         iface->ifname = os_strdup(pos);
 780         if (iface->ifname == NULL) {
 781                 wpa_priv_interface_deinit(iface);
 782                 return NULL;
 783         }
 784
 785         len = os_strlen(dir) + 1 + os_strlen(iface->ifname);
 786         iface->sock_name = os_malloc(len + 1);
 787         if (iface->sock_name == NULL) {
 788                 wpa_priv_interface_deinit(iface);
 789                 return NULL;
 790         }
 791
 792         os_snprintf(iface->sock_name, len + 1, "%s/%s", dir, iface->ifname);
 793         if (os_strlen(iface->sock_name) >= sizeof(addr.sun_path)) {
 794                 wpa_priv_interface_deinit(iface);
 795                 return NULL;
 796         }
 797
 798         iface->fd = socket(PF_UNIX, SOCK_DGRAM, 0);
 799         if (iface->fd < 0) {
 800                 wpa_printf(MSG_ERROR, "socket(PF_UNIX): %s", strerror(errno));
 801                 wpa_priv_interface_deinit(iface);
 802                 return NULL;
 803         }
 804
 805         os_memset(&addr, 0, sizeof(addr));
 806         addr.sun_family = AF_UNIX;
 807         os_strlcpy(addr.sun_path, iface->sock_name, sizeof(addr.sun_path));
 808
 809         if (bind(iface->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 810                 wpa_printf(MSG_DEBUG, "bind(PF_UNIX) failed: %s",
 811                            strerror(errno));
 812                 if (connect(iface->fd, (struct sockaddr *) &addr,
 813                             sizeof(addr)) < 0) {
 814                         wpa_printf(MSG_DEBUG, "Socket exists, but does not "
 815                                    "allow connections - assuming it was "
 816                                    "leftover from forced program termination");
 817                         if (unlink(iface->sock_name) < 0) {
 818                                 wpa_printf(MSG_ERROR,
 819                                            "Could not unlink existing ctrl_iface socket '%s': %s",
 820                                            iface->sock_name, strerror(errno));
 821                                 goto fail;
 822                         }
 823                         if (bind(iface->fd, (struct sockaddr *) &addr,
 824                                  sizeof(addr)) < 0) {
 825                                 wpa_printf(MSG_ERROR,
 826                                            "wpa-priv-iface-init: bind(PF_UNIX): %s",
 827                                            strerror(errno));
 828                                 goto fail;
 829                         }
 830                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 831                                    "socket '%s'", iface->sock_name);
 832                 } else {
 833                         wpa_printf(MSG_INFO, "Socket exists and seems to be "
 834                                    "in use - cannot override it");
 835                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 836                                    "not used anymore", iface->sock_name);
 837                         goto fail;
 838                 }
 839         }
 840
 841         if (chmod(iface->sock_name, S_IRWXU | S_IRWXG | S_IRWXO) < 0) {
 842                 wpa_printf(MSG_ERROR, "chmod: %s", strerror(errno));
 843                 goto fail;
 844         }
 845
 846         eloop_register_read_sock(iface->fd, wpa_priv_receive, iface, NULL);
 847
 848         return iface;
 849
 850 fail:
 851         wpa_priv_interface_deinit(iface);
 852         return NULL;
 853 }
 854
 855
 856 static int wpa_priv_send_event(struct wpa_priv_interface *iface, int event,
 857                                const void *data, size_t data_len)
 858 {
 859         struct msghdr msg;
 860         struct iovec io[2];
 861
 862         io[0].iov_base = &event;
 863         io[0].iov_len = sizeof(event);
 864         io[1].iov_base = (u8 *) data;
 865         io[1].iov_len = data_len;
 866
 867         os_memset(&msg, 0, sizeof(msg));
 868         msg.msg_iov = io;
 869         msg.msg_iovlen = data ? 2 : 1;
 870         msg.msg_name = &iface->drv_addr;
 871         msg.msg_namelen = iface->drv_addr_len;
 872
 873         if (sendmsg(iface->fd, &msg, 0) < 0) {
 874                 wpa_printf(MSG_ERROR, "sendmsg(wpas_socket): %s",
 875                            strerror(errno));
 876                 return -1;
 877         }
 878
 879         return 0;
 880 }
 881
 882
 883 static void wpa_priv_send_auth(struct wpa_priv_interface *iface,
 884                                union wpa_event_data *data)
 885 {
 886         size_t buflen = sizeof(struct privsep_event_auth) + data->auth.ies_len;
 887         struct privsep_event_auth *auth;
 888         u8 *buf, *pos;
 889
 890         buf = os_zalloc(buflen);
 891         if (buf == NULL)
 892                 return;
 893
 894         auth = (struct privsep_event_auth *) buf;
 895         pos = (u8 *) (auth + 1);
 896
 897         os_memcpy(auth->peer, data->auth.peer, ETH_ALEN);
 898         os_memcpy(auth->bssid, data->auth.bssid, ETH_ALEN);
 899         auth->auth_type = data->auth.auth_type;
 900         auth->auth_transaction = data->auth.auth_transaction;
 901         auth->status_code = data->auth.status_code;
 902         if (data->auth.ies) {
 903                 os_memcpy(pos, data->auth.ies, data->auth.ies_len);
 904                 auth->ies_len = data->auth.ies_len;
 905         }
 906
 907         wpa_priv_send_event(iface, PRIVSEP_EVENT_AUTH, buf, buflen);
 908
 909         os_free(buf);
 910 }
 911
 912
 913 static void wpa_priv_send_assoc(struct wpa_priv_interface *iface, int event,
 914                                 union wpa_event_data *data)
 915 {
 916         size_t buflen = 3 * sizeof(int);
 917         u8 *buf, *pos;
 918         int len;
 919
 920         if (data) {
 921                 buflen += data->assoc_info.req_ies_len +
 922                         data->assoc_info.resp_ies_len +
 923                         data->assoc_info.beacon_ies_len;
 924         }
 925
 926         buf = os_malloc(buflen);
 927         if (buf == NULL)
 928                 return;
 929
 930         pos = buf;
 931
 932         if (data && data->assoc_info.req_ies) {
 933                 len = data->assoc_info.req_ies_len;
 934                 os_memcpy(pos, &len, sizeof(int));
 935                 pos += sizeof(int);
 936                 os_memcpy(pos, data->assoc_info.req_ies, len);
 937                 pos += len;
 938         } else {
 939                 len = 0;
 940                 os_memcpy(pos, &len, sizeof(int));
 941                 pos += sizeof(int);
 942         }
 943
 944         if (data && data->assoc_info.resp_ies) {
 945                 len = data->assoc_info.resp_ies_len;
 946                 os_memcpy(pos, &len, sizeof(int));
 947                 pos += sizeof(int);
 948                 os_memcpy(pos, data->assoc_info.resp_ies, len);
 949                 pos += len;
 950         } else {
 951                 len = 0;
 952                 os_memcpy(pos, &len, sizeof(int));
 953                 pos += sizeof(int);
 954         }
 955
 956         if (data && data->assoc_info.beacon_ies) {
 957                 len = data->assoc_info.beacon_ies_len;
 958                 os_memcpy(pos, &len, sizeof(int));
 959                 pos += sizeof(int);
 960                 os_memcpy(pos, data->assoc_info.beacon_ies, len);
 961                 pos += len;
 962         } else {
 963                 len = 0;
 964                 os_memcpy(pos, &len, sizeof(int));
 965                 pos += sizeof(int);
 966         }
 967
 968         wpa_priv_send_event(iface, event, buf, buflen);
 969
 970         os_free(buf);
 971 }
 972
 973
 974 static void wpa_priv_send_interface_status(struct wpa_priv_interface *iface,
 975                                            union wpa_event_data *data)
 976 {
 977         int ievent;
 978         size_t len, maxlen;
 979         u8 *buf;
 980         char *ifname;
 981
 982         if (data == NULL)
 983                 return;
 984
 985         ievent = data->interface_status.ievent;
 986         maxlen = sizeof(data->interface_status.ifname);
 987         ifname = data->interface_status.ifname;
 988         for (len = 0; len < maxlen && ifname[len]; len++)
 989                 ;
 990
 991         buf = os_malloc(sizeof(int) + len);
 992         if (buf == NULL)
 993                 return;
 994
 995         os_memcpy(buf, &ievent, sizeof(int));
 996         os_memcpy(buf + sizeof(int), ifname, len);
 997
 998         wpa_priv_send_event(iface, PRIVSEP_EVENT_INTERFACE_STATUS,
 999                             buf, sizeof(int) + len);
1000
1001         os_free(buf);
1002
1003 }
1004
1005
1006 static void wpa_priv_send_ft_response(struct wpa_priv_interface *iface,
1007                                       union wpa_event_data *data)
1008 {
1009         size_t len;
1010         u8 *buf, *pos;
1011
1012         if (data == NULL || data->ft_ies.ies == NULL)
1013                 return;
1014
1015         len = sizeof(int) + ETH_ALEN + data->ft_ies.ies_len;
1016         buf = os_malloc(len);
1017         if (buf == NULL)
1018                 return;
1019
1020         pos = buf;
1021         os_memcpy(pos, &data->ft_ies.ft_action, sizeof(int));
1022         pos += sizeof(int);
1023         os_memcpy(pos, data->ft_ies.target_ap, ETH_ALEN);
1024         pos += ETH_ALEN;
1025         os_memcpy(pos, data->ft_ies.ies, data->ft_ies.ies_len);
1026
1027         wpa_priv_send_event(iface, PRIVSEP_EVENT_FT_RESPONSE, buf, len);
1028
1029         os_free(buf);
1030
1031 }
1032
1033
1034 void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
1035                           union wpa_event_data *data)
1036 {
1037         struct wpa_priv_interface *iface = ctx;
1038
1039         wpa_printf(MSG_DEBUG, "%s - event=%d", __func__, event);
1040
1041         if (!iface->wpas_registered) {
1042                 wpa_printf(MSG_DEBUG, "Driver event received, but "
1043                            "wpa_supplicant not registered");
1044                 return;
1045         }
1046
1047         switch (event) {
1048         case EVENT_ASSOC:
1049                 wpa_priv_send_assoc(iface, PRIVSEP_EVENT_ASSOC, data);
1050                 break;
1051         case EVENT_DISASSOC:
1052                 wpa_priv_send_event(iface, PRIVSEP_EVENT_DISASSOC, NULL, 0);
1053                 break;
1054         case EVENT_ASSOCINFO:
1055                 if (data == NULL)
1056                         return;
1057                 wpa_priv_send_assoc(iface, PRIVSEP_EVENT_ASSOCINFO, data);
1058                 break;
1059         case EVENT_MICHAEL_MIC_FAILURE:
1060                 if (data == NULL)
1061                         return;
1062                 wpa_priv_send_event(iface, PRIVSEP_EVENT_MICHAEL_MIC_FAILURE,
1063                                     &data->michael_mic_failure.unicast,
1064                                     sizeof(int));
1065                 break;
1066         case EVENT_SCAN_STARTED:
1067                 wpa_priv_send_event(iface, PRIVSEP_EVENT_SCAN_STARTED, NULL,
1068                                     0);
1069                 break;
1070         case EVENT_SCAN_RESULTS:
1071                 wpa_priv_send_event(iface, PRIVSEP_EVENT_SCAN_RESULTS, NULL,
1072                                     0);
1073                 break;
1074         case EVENT_INTERFACE_STATUS:
1075                 wpa_priv_send_interface_status(iface, data);
1076                 break;
1077         case EVENT_PMKID_CANDIDATE:
1078                 if (data == NULL)
1079                         return;
1080                 wpa_priv_send_event(iface, PRIVSEP_EVENT_PMKID_CANDIDATE,
1081                                     &data->pmkid_candidate,
1082                                     sizeof(struct pmkid_candidate));
1083                 break;
1084         case EVENT_FT_RESPONSE:
1085                 wpa_priv_send_ft_response(iface, data);
1086                 break;
1087         case EVENT_AUTH:
1088                 wpa_priv_send_auth(iface, data);
1089                 break;
1090         default:
1091                 wpa_printf(MSG_DEBUG, "Unsupported driver event %d (%s) - TODO",
1092                            event, event_to_string(event));
1093                 break;
1094         }
1095 }
1096
1097
1098 void wpa_supplicant_event_global(void *ctx, enum wpa_event_type event,
1099                                  union wpa_event_data *data)
1100 {
1101         struct wpa_priv_global *global = ctx;
1102         struct wpa_priv_interface *iface;
1103
1104         if (event != EVENT_INTERFACE_STATUS)
1105                 return;
1106
1107         for (iface = global->interfaces; iface; iface = iface->next) {
1108                 if (os_strcmp(iface->ifname, data->interface_status.ifname) ==
1109                     0)
1110                         break;
1111         }
1112         if (iface && iface->driver->get_ifindex) {
1113                 unsigned int ifindex;
1114
1115                 ifindex = iface->driver->get_ifindex(iface->drv_priv);
1116                 if (ifindex != data->interface_status.ifindex) {
1117                         wpa_printf(MSG_DEBUG,
1118                                    "%s: interface status ifindex %d mismatch (%d)",
1119                                    iface->ifname, ifindex,
1120                                    data->interface_status.ifindex);
1121                         return;
1122                 }
1123         }
1124         if (iface)
1125                 wpa_supplicant_event(iface, event, data);
1126 }
1127
1128
1129 void wpa_supplicant_rx_eapol(void *ctx, const u8 *src_addr,
1130                              const u8 *buf, size_t len)
1131 {
1132         struct wpa_priv_interface *iface = ctx;
1133         struct msghdr msg;
1134         struct iovec io[3];
1135         int event = PRIVSEP_EVENT_RX_EAPOL;
1136
1137         wpa_printf(MSG_DEBUG, "RX EAPOL from driver");
1138         io[0].iov_base = &event;
1139         io[0].iov_len = sizeof(event);
1140         io[1].iov_base = (u8 *) src_addr;
1141         io[1].iov_len = ETH_ALEN;
1142         io[2].iov_base = (u8 *) buf;
1143         io[2].iov_len = len;
1144
1145         os_memset(&msg, 0, sizeof(msg));
1146         msg.msg_iov = io;
1147         msg.msg_iovlen = 3;
1148         msg.msg_name = &iface->drv_addr;
1149         msg.msg_namelen = iface->drv_addr_len;
1150
1151         if (sendmsg(iface->fd, &msg, 0) < 0)
1152                 wpa_printf(MSG_ERROR, "sendmsg(wpas_socket): %s",
1153                            strerror(errno));
1154 }
1155
1156
1157 static void wpa_priv_terminate(int sig, void *signal_ctx)
1158 {
1159         wpa_printf(MSG_DEBUG, "wpa_priv termination requested");
1160         eloop_terminate();
1161 }
1162
1163
1164 static void wpa_priv_fd_workaround(void)
1165 {
1166 #ifdef __linux__
1167         int s, i;
1168         /* When started from pcmcia-cs scripts, wpa_supplicant might start with
1169          * fd 0, 1, and 2 closed. This will cause some issues because many
1170          * places in wpa_supplicant are still printing out to stdout. As a
1171          * workaround, make sure that fd's 0, 1, and 2 are not used for other
1172          * sockets. */
1173         for (i = 0; i < 3; i++) {
1174                 s = open("/dev/null", O_RDWR);
1175                 if (s > 2) {
1176                         close(s);
1177                         break;
1178                 }
1179         }
1180 #endif /* __linux__ */
1181 }
1182
1183
1184 static void usage(void)
1185 {
1186         printf("wpa_priv v" VERSION_STR "\n"
1187                "Copyright (c) 2007-2017, Jouni Malinen <j@w1.fi> and "
1188                "contributors\n"
1189                "\n"
1190                "usage:\n"
1191                "  wpa_priv [-Bdd] [-c<ctrl dir>] [-P<pid file>] "
1192                "<driver:ifname> \\\n"
1193                "           [driver:ifname ...]\n");
1194 }
1195
1196
1197 int main(int argc, char *argv[])
1198 {
1199         int c, i;
1200         int ret = -1;
1201         char *pid_file = NULL;
1202         int daemonize = 0;
1203         char *ctrl_dir = "/var/run/wpa_priv";
1204         struct wpa_priv_global global;
1205         struct wpa_priv_interface *iface;
1206
1207         if (os_program_init())
1208                 return -1;
1209
1210         wpa_priv_fd_workaround();
1211
1212         os_memset(&global, 0, sizeof(global));
1213         global.interfaces = NULL;
1214
1215         for (;;) {
1216                 c = getopt(argc, argv, "Bc:dP:");
1217                 if (c < 0)
1218                         break;
1219                 switch (c) {
1220                 case 'B':
1221                         daemonize++;
1222                         break;
1223                 case 'c':
1224                         ctrl_dir = optarg;
1225                         break;
1226                 case 'd':
1227                         wpa_debug_level--;
1228                         break;
1229                 case 'P':
1230                         pid_file = os_rel2abs_path(optarg);
1231                         break;
1232                 default:
1233                         usage();
1234                         goto out2;
1235                 }
1236         }
1237
1238         if (optind >= argc) {
1239                 usage();
1240                 goto out2;
1241         }
1242
1243         wpa_printf(MSG_DEBUG, "wpa_priv control directory: '%s'", ctrl_dir);
1244
1245         if (eloop_init()) {
1246                 wpa_printf(MSG_ERROR, "Failed to initialize event loop");
1247                 goto out2;
1248         }
1249
1250         for (i = optind; i < argc; i++) {
1251                 wpa_printf(MSG_DEBUG, "Adding driver:interface %s", argv[i]);
1252                 iface = wpa_priv_interface_init(&global, ctrl_dir, argv[i]);
1253                 if (iface == NULL)
1254                         goto out;
1255                 iface->next = global.interfaces;
1256                 global.interfaces = iface;
1257         }
1258
1259         if (daemonize && os_daemonize(pid_file) && eloop_sock_requeue())
1260                 goto out;
1261
1262         eloop_register_signal_terminate(wpa_priv_terminate, NULL);
1263         eloop_run();
1264
1265         ret = 0;
1266
1267 out:
1268         iface = global.interfaces;
1269         while (iface) {
1270                 struct wpa_priv_interface *prev = iface;
1271                 iface = iface->next;
1272                 wpa_priv_interface_deinit(prev);
1273         }
1274
1275         eloop_destroy();
1276
1277 out2:
1278         if (daemonize)
1279                 os_daemonize_terminate(pid_file);
1280         os_free(pid_file);
1281         os_program_deinit();
1282
1283         return ret;
1284 }