session.c

   1 /*
   2  * rpcd - UBUS RPC server
   3  *
   4  *   Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   5  *   Copyright (C) 2013-2014 Jo-Philipp Wich <jow@openwrt.org>
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 #define _GNU_SOURCE     /* crypt() */
  21
  22 #include <libubox/avl-cmp.h>
  23 #include <libubox/blobmsg.h>
  24 #include <libubox/utils.h>
  25 #include <libubus.h>
  26 #include <fnmatch.h>
  27 #include <glob.h>
  28 #include <uci.h>
  29 #include <limits.h>
  30
  31 #ifdef HAVE_SHADOW
  32 #include <shadow.h>
  33 #endif
  34
  35 #include <rpcd/session.h>
  36
  37 static struct avl_tree sessions;
  38 static struct blob_buf buf;
  39
  40 static LIST_HEAD(create_callbacks);
  41 static LIST_HEAD(destroy_callbacks);
  42
  43 enum {
  44         RPC_SN_TIMEOUT,
  45         __RPC_SN_MAX,
  46 };
  47 static const struct blobmsg_policy new_policy[__RPC_SN_MAX] = {
  48         [RPC_SN_TIMEOUT] = { .name = "timeout", .type = BLOBMSG_TYPE_INT32 },
  49 };
  50
  51 enum {
  52         RPC_SI_SID,
  53         __RPC_SI_MAX,
  54 };
  55 static const struct blobmsg_policy sid_policy[__RPC_SI_MAX] = {
  56         [RPC_SI_SID] = { .name = "ubus_rpc_session", .type = BLOBMSG_TYPE_STRING },
  57 };
  58
  59 enum {
  60         RPC_SS_SID,
  61         RPC_SS_VALUES,
  62         __RPC_SS_MAX,
  63 };
  64 static const struct blobmsg_policy set_policy[__RPC_SS_MAX] = {
  65         [RPC_SS_SID] = { .name = "ubus_rpc_session", .type = BLOBMSG_TYPE_STRING },
  66         [RPC_SS_VALUES] = { .name = "values", .type = BLOBMSG_TYPE_TABLE },
  67 };
  68
  69 enum {
  70         RPC_SG_SID,
  71         RPC_SG_KEYS,
  72         __RPC_SG_MAX,
  73 };
  74 static const struct blobmsg_policy get_policy[__RPC_SG_MAX] = {
  75         [RPC_SG_SID] = { .name = "ubus_rpc_session", .type = BLOBMSG_TYPE_STRING },
  76         [RPC_SG_KEYS] = { .name = "keys", .type = BLOBMSG_TYPE_ARRAY },
  77 };
  78
  79 enum {
  80         RPC_SA_SID,
  81         RPC_SA_SCOPE,
  82         RPC_SA_OBJECTS,
  83         __RPC_SA_MAX,
  84 };
  85 static const struct blobmsg_policy acl_policy[__RPC_SA_MAX] = {
  86         [RPC_SA_SID] = { .name = "ubus_rpc_session", .type = BLOBMSG_TYPE_STRING },
  87         [RPC_SA_SCOPE] = { .name = "scope", .type = BLOBMSG_TYPE_STRING },
  88         [RPC_SA_OBJECTS] = { .name = "objects", .type = BLOBMSG_TYPE_ARRAY },
  89 };
  90
  91 enum {
  92         RPC_SP_SID,
  93         RPC_SP_SCOPE,
  94         RPC_SP_OBJECT,
  95         RPC_SP_FUNCTION,
  96         __RPC_SP_MAX,
  97 };
  98 static const struct blobmsg_policy perm_policy[__RPC_SP_MAX] = {
  99         [RPC_SP_SID] = { .name = "ubus_rpc_session", .type = BLOBMSG_TYPE_STRING },
 100         [RPC_SP_SCOPE] = { .name = "scope", .type = BLOBMSG_TYPE_STRING },
 101         [RPC_SP_OBJECT] = { .name = "object", .type = BLOBMSG_TYPE_STRING },
 102         [RPC_SP_FUNCTION] = { .name = "function", .type = BLOBMSG_TYPE_STRING },
 103 };
 104
 105 enum {
 106         RPC_DUMP_SID,
 107         RPC_DUMP_TIMEOUT,
 108         RPC_DUMP_EXPIRES,
 109         RPC_DUMP_DATA,
 110         __RPC_DUMP_MAX,
 111 };
 112 static const struct blobmsg_policy dump_policy[__RPC_DUMP_MAX] = {
 113         [RPC_DUMP_SID] = { .name = "ubus_rpc_session", .type = BLOBMSG_TYPE_STRING },
 114         [RPC_DUMP_TIMEOUT] = { .name = "timeout", .type = BLOBMSG_TYPE_INT32 },
 115         [RPC_DUMP_EXPIRES] = { .name = "expires", .type = BLOBMSG_TYPE_INT32 },
 116         [RPC_DUMP_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 117 };
 118
 119 enum {
 120         RPC_L_USERNAME,
 121         RPC_L_PASSWORD,
 122         RPC_L_TIMEOUT,
 123         __RPC_L_MAX,
 124 };
 125 static const struct blobmsg_policy login_policy[__RPC_L_MAX] = {
 126         [RPC_L_USERNAME] = { .name = "username", .type = BLOBMSG_TYPE_STRING },
 127         [RPC_L_PASSWORD] = { .name = "password", .type = BLOBMSG_TYPE_STRING },
 128         [RPC_L_TIMEOUT]  = { .name = "timeout", .type = BLOBMSG_TYPE_INT32 },
 129 };
 130
 131 /*
 132  * Keys in the AVL tree contain all pattern characters up to the first wildcard.
 133  * To look up entries, start with the last entry that has a key less than or
 134  * equal to the method name, then work backwards as long as the AVL key still
 135  * matches its counterpart in the object name
 136  */
 137 #define uh_foreach_matching_acl_prefix(_acl, _avl, _obj, _func)         \
 138         for (_acl = avl_find_le_element(_avl, _obj, _acl, avl);                 \
 139              _acl;                                                                                                              \
 140              _acl = avl_is_first(_avl, &(_acl)->avl) ? NULL :                   \
 141                     avl_prev_element((_acl), avl))
 142
 143 #define uh_foreach_matching_acl(_acl, _avl, _obj, _func)                        \
 144         uh_foreach_matching_acl_prefix(_acl, _avl, _obj, _func)                 \
 145                 if (!strncmp((_acl)->object, _obj, (_acl)->sort_len) &&         \
 146                     !fnmatch((_acl)->object, (_obj), FNM_NOESCAPE) &&           \
 147                     !fnmatch((_acl)->function, (_func), FNM_NOESCAPE))
 148
 149 static int
 150 rpc_random(char *dest)
 151 {
 152         unsigned char buf[16] = { 0 };
 153         FILE *f;
 154         int i;
 155         int ret;
 156
 157         f = fopen("/dev/urandom", "r");
 158         if (!f)
 159                 return -1;
 160
 161         ret = fread(buf, 1, sizeof(buf), f);
 162         fclose(f);
 163
 164         if (ret < 0)
 165                 return ret;
 166
 167         for (i = 0; i < sizeof(buf); i++)
 168                 sprintf(dest + (i<<1), "%02x", buf[i]);
 169
 170         return 0;
 171 }
 172
 173 static void
 174 rpc_session_dump_data(struct rpc_session *ses, struct blob_buf *b)
 175 {
 176         struct rpc_session_data *d;
 177
 178         avl_for_each_element(&ses->data, d, avl) {
 179                 blobmsg_add_field(b, blobmsg_type(d->attr), blobmsg_name(d->attr),
 180                                   blobmsg_data(d->attr), blobmsg_data_len(d->attr));
 181         }
 182 }
 183
 184 static void
 185 rpc_session_dump_acls(struct rpc_session *ses, struct blob_buf *b)
 186 {
 187         struct rpc_session_acl *acl;
 188         struct rpc_session_acl_scope *acl_scope;
 189         const char *lastobj = NULL;
 190         const char *lastscope = NULL;
 191         void *c = NULL, *d = NULL;
 192
 193         avl_for_each_element(&ses->acls, acl_scope, avl) {
 194                 if (!lastscope || strcmp(acl_scope->avl.key, lastscope))
 195                 {
 196                         if (c) blobmsg_close_table(b, c);
 197                         c = blobmsg_open_table(b, acl_scope->avl.key);
 198                         lastobj = NULL;
 199                 }
 200
 201                 d = NULL;
 202
 203                 avl_for_each_element(&acl_scope->acls, acl, avl) {
 204                         if (!lastobj || strcmp(acl->object, lastobj))
 205                         {
 206                                 if (d) blobmsg_close_array(b, d);
 207                                 d = blobmsg_open_array(b, acl->object);
 208                         }
 209
 210                         blobmsg_add_string(b, NULL, acl->function);
 211                         lastobj = acl->object;
 212                 }
 213
 214                 if (d) blobmsg_close_array(b, d);
 215         }
 216
 217         if (c) blobmsg_close_table(b, c);
 218 }
 219
 220 static void
 221 rpc_session_to_blob(struct rpc_session *ses, bool acls)
 222 {
 223         void *c;
 224
 225         blob_buf_init(&buf, 0);
 226
 227         blobmsg_add_string(&buf, "ubus_rpc_session", ses->id);
 228         blobmsg_add_u32(&buf, "timeout", ses->timeout);
 229         blobmsg_add_u32(&buf, "expires", uloop_timeout_remaining(&ses->t) / 1000);
 230
 231         if (acls) {
 232                 c = blobmsg_open_table(&buf, "acls");
 233                 rpc_session_dump_acls(ses, &buf);
 234                 blobmsg_close_table(&buf, c);
 235         }
 236
 237         c = blobmsg_open_table(&buf, "data");
 238         rpc_session_dump_data(ses, &buf);
 239         blobmsg_close_table(&buf, c);
 240 }
 241
 242 static void
 243 rpc_session_dump(struct rpc_session *ses, struct ubus_context *ctx,
 244                  struct ubus_request_data *req)
 245 {
 246         rpc_session_to_blob(ses, true);
 247
 248         ubus_send_reply(ctx, req, buf.head);
 249 }
 250
 251 static void
 252 rpc_touch_session(struct rpc_session *ses)
 253 {
 254         if (ses->timeout > 0)
 255                 uloop_timeout_set(&ses->t, ses->timeout * 1000);
 256 }
 257
 258 static void
 259 rpc_session_destroy(struct rpc_session *ses)
 260 {
 261         struct rpc_session_acl *acl, *nacl;
 262         struct rpc_session_acl_scope *acl_scope, *nacl_scope;
 263         struct rpc_session_data *data, *ndata;
 264         struct rpc_session_cb *cb;
 265
 266         list_for_each_entry(cb, &destroy_callbacks, list)
 267                 cb->cb(ses, cb->priv);
 268
 269         uloop_timeout_cancel(&ses->t);
 270
 271         avl_for_each_element_safe(&ses->acls, acl_scope, avl, nacl_scope) {
 272                 avl_remove_all_elements(&acl_scope->acls, acl, avl, nacl)
 273                         free(acl);
 274
 275                 avl_delete(&ses->acls, &acl_scope->avl);
 276                 free(acl_scope);
 277         }
 278
 279         avl_remove_all_elements(&ses->data, data, avl, ndata)
 280                 free(data);
 281
 282         avl_delete(&sessions, &ses->avl);
 283         free(ses);
 284 }
 285
 286 static void rpc_session_timeout(struct uloop_timeout *t)
 287 {
 288         struct rpc_session *ses;
 289
 290         ses = container_of(t, struct rpc_session, t);
 291         rpc_session_destroy(ses);
 292 }
 293
 294 static struct rpc_session *
 295 rpc_session_new(void)
 296 {
 297         struct rpc_session *ses;
 298
 299         ses = calloc(1, sizeof(*ses));
 300
 301         if (!ses)
 302                 return NULL;
 303
 304         ses->avl.key = ses->id;
 305
 306         avl_init(&ses->acls, avl_strcmp, true, NULL);
 307         avl_init(&ses->data, avl_strcmp, false, NULL);
 308
 309         ses->t.cb = rpc_session_timeout;
 310
 311         return ses;
 312 }
 313
 314 static struct rpc_session *
 315 rpc_session_create(int timeout)
 316 {
 317         struct rpc_session *ses;
 318         struct rpc_session_cb *cb;
 319
 320         ses = rpc_session_new();
 321
 322         if (!ses)
 323                 return NULL;
 324
 325         if (rpc_random(ses->id))
 326                 return NULL;
 327
 328         ses->timeout = timeout;
 329
 330         avl_insert(&sessions, &ses->avl);
 331
 332         rpc_touch_session(ses);
 333
 334         list_for_each_entry(cb, &create_callbacks, list)
 335                 cb->cb(ses, cb->priv);
 336
 337         return ses;
 338 }
 339
 340 static struct rpc_session *
 341 rpc_session_get(const char *id)
 342 {
 343         struct rpc_session *ses;
 344
 345         ses = avl_find_element(&sessions, id, ses, avl);
 346         if (!ses)
 347                 return NULL;
 348
 349         rpc_touch_session(ses);
 350         return ses;
 351 }
 352
 353 static int
 354 rpc_handle_create(struct ubus_context *ctx, struct ubus_object *obj,
 355                   struct ubus_request_data *req, const char *method,
 356                   struct blob_attr *msg)
 357 {
 358         struct rpc_session *ses;
 359         struct blob_attr *tb;
 360         int timeout = RPC_DEFAULT_SESSION_TIMEOUT;
 361
 362         blobmsg_parse(new_policy, __RPC_SN_MAX, &tb, blob_data(msg), blob_len(msg));
 363         if (tb)
 364                 timeout = blobmsg_get_u32(tb);
 365
 366         ses = rpc_session_create(timeout);
 367         if (ses)
 368                 rpc_session_dump(ses, ctx, req);
 369
 370         return 0;
 371 }
 372
 373 static int
 374 rpc_handle_list(struct ubus_context *ctx, struct ubus_object *obj,
 375                 struct ubus_request_data *req, const char *method,
 376                 struct blob_attr *msg)
 377 {
 378         struct rpc_session *ses;
 379         struct blob_attr *tb;
 380
 381         blobmsg_parse(sid_policy, __RPC_SI_MAX, &tb, blob_data(msg), blob_len(msg));
 382
 383         if (!tb) {
 384                 avl_for_each_element(&sessions, ses, avl)
 385                         rpc_session_dump(ses, ctx, req);
 386                 return 0;
 387         }
 388
 389         ses = rpc_session_get(blobmsg_data(tb));
 390         if (!ses)
 391                 return UBUS_STATUS_NOT_FOUND;
 392
 393         rpc_session_dump(ses, ctx, req);
 394
 395         return 0;
 396 }
 397
 398 static int
 399 uh_id_len(const char *str)
 400 {
 401         return strcspn(str, "*?[");
 402 }
 403
 404 static int
 405 rpc_session_grant(struct rpc_session *ses,
 406                   const char *scope, const char *object, const char *function)
 407 {
 408         struct rpc_session_acl *acl;
 409         struct rpc_session_acl_scope *acl_scope;
 410         char *new_scope, *new_obj, *new_func, *new_id;
 411         int id_len;
 412
 413         if (!object || !function)
 414                 return UBUS_STATUS_INVALID_ARGUMENT;
 415
 416         acl_scope = avl_find_element(&ses->acls, scope, acl_scope, avl);
 417
 418         if (acl_scope) {
 419                 uh_foreach_matching_acl_prefix(acl, &acl_scope->acls, object, function) {
 420                         if (!strcmp(acl->object, object) &&
 421                                 !strcmp(acl->function, function))
 422                                 return 0;
 423                 }
 424         }
 425
 426         if (!acl_scope) {
 427                 acl_scope = calloc_a(sizeof(*acl_scope),
 428                                      &new_scope, strlen(scope) + 1);
 429
 430                 if (!acl_scope)
 431                         return UBUS_STATUS_UNKNOWN_ERROR;
 432
 433                 acl_scope->avl.key = strcpy(new_scope, scope);
 434                 avl_init(&acl_scope->acls, avl_strcmp, true, NULL);
 435                 avl_insert(&ses->acls, &acl_scope->avl);
 436         }
 437
 438         id_len = uh_id_len(object);
 439         acl = calloc_a(sizeof(*acl),
 440                 &new_obj, strlen(object) + 1,
 441                 &new_func, strlen(function) + 1,
 442                 &new_id, id_len + 1);
 443
 444         if (!acl)
 445                 return UBUS_STATUS_UNKNOWN_ERROR;
 446
 447         acl->object = strcpy(new_obj, object);
 448         acl->function = strcpy(new_func, function);
 449         acl->avl.key = strncpy(new_id, object, id_len);
 450         avl_insert(&acl_scope->acls, &acl->avl);
 451
 452         return 0;
 453 }
 454
 455 static int
 456 rpc_session_revoke(struct rpc_session *ses,
 457                    const char *scope, const char *object, const char *function)
 458 {
 459         struct rpc_session_acl *acl, *next;
 460         struct rpc_session_acl_scope *acl_scope;
 461         int id_len;
 462         char *id;
 463
 464         acl_scope = avl_find_element(&ses->acls, scope, acl_scope, avl);
 465
 466         if (!acl_scope)
 467                 return 0;
 468
 469         if (!object && !function) {
 470                 avl_remove_all_elements(&acl_scope->acls, acl, avl, next)
 471                         free(acl);
 472                 avl_delete(&ses->acls, &acl_scope->avl);
 473                 free(acl_scope);
 474                 return 0;
 475         }
 476
 477         id_len = uh_id_len(object);
 478         id = alloca(id_len + 1);
 479         strncpy(id, object, id_len);
 480         id[id_len] = 0;
 481
 482         acl = avl_find_element(&acl_scope->acls, id, acl, avl);
 483         while (acl) {
 484                 if (!avl_is_last(&acl_scope->acls, &acl->avl))
 485                         next = avl_next_element(acl, avl);
 486                 else
 487                         next = NULL;
 488
 489                 if (strcmp(id, acl->avl.key) != 0)
 490                         break;
 491
 492                 if (!strcmp(acl->object, object) &&
 493                     !strcmp(acl->function, function)) {
 494                         avl_delete(&acl_scope->acls, &acl->avl);
 495                         free(acl);
 496                 }
 497                 acl = next;
 498         }
 499
 500         if (avl_is_empty(&acl_scope->acls)) {
 501                 avl_delete(&ses->acls, &acl_scope->avl);
 502                 free(acl_scope);
 503         }
 504
 505         return 0;
 506 }
 507
 508
 509 static int
 510 rpc_handle_acl(struct ubus_context *ctx, struct ubus_object *obj,
 511                struct ubus_request_data *req, const char *method,
 512                struct blob_attr *msg)
 513 {
 514         struct rpc_session *ses;
 515         struct blob_attr *tb[__RPC_SA_MAX];
 516         struct blob_attr *attr, *sattr;
 517         const char *object, *function;
 518         const char *scope = "ubus";
 519         int rem1, rem2;
 520
 521         int (*cb)(struct rpc_session *ses,
 522                   const char *scope, const char *object, const char *function);
 523
 524         blobmsg_parse(acl_policy, __RPC_SA_MAX, tb, blob_data(msg), blob_len(msg));
 525
 526         if (!tb[RPC_SA_SID])
 527                 return UBUS_STATUS_INVALID_ARGUMENT;
 528
 529         ses = rpc_session_get(blobmsg_data(tb[RPC_SA_SID]));
 530         if (!ses)
 531                 return UBUS_STATUS_NOT_FOUND;
 532
 533         if (tb[RPC_SA_SCOPE])
 534                 scope = blobmsg_data(tb[RPC_SA_SCOPE]);
 535
 536         if (!strcmp(method, "grant"))
 537                 cb = rpc_session_grant;
 538         else
 539                 cb = rpc_session_revoke;
 540
 541         if (!tb[RPC_SA_OBJECTS])
 542                 return cb(ses, scope, NULL, NULL);
 543
 544         blobmsg_for_each_attr(attr, tb[RPC_SA_OBJECTS], rem1) {
 545                 if (blobmsg_type(attr) != BLOBMSG_TYPE_ARRAY)
 546                         continue;
 547
 548                 object = NULL;
 549                 function = NULL;
 550
 551                 blobmsg_for_each_attr(sattr, attr, rem2) {
 552                         if (blobmsg_type(sattr) != BLOBMSG_TYPE_STRING)
 553                                 continue;
 554
 555                         if (!object)
 556                                 object = blobmsg_data(sattr);
 557                         else if (!function)
 558                                 function = blobmsg_data(sattr);
 559                         else
 560                                 break;
 561                 }
 562
 563                 if (object && function)
 564                         cb(ses, scope, object, function);
 565         }
 566
 567         return 0;
 568 }
 569
 570 static bool
 571 rpc_session_acl_allowed(struct rpc_session *ses, const char *scope,
 572                         const char *obj, const char *fun)
 573 {
 574         struct rpc_session_acl *acl;
 575         struct rpc_session_acl_scope *acl_scope;
 576
 577         acl_scope = avl_find_element(&ses->acls, scope, acl_scope, avl);
 578
 579         if (acl_scope) {
 580                 uh_foreach_matching_acl(acl, &acl_scope->acls, obj, fun)
 581                         return true;
 582         }
 583
 584         return false;
 585 }
 586
 587 static int
 588 rpc_handle_access(struct ubus_context *ctx, struct ubus_object *obj,
 589                   struct ubus_request_data *req, const char *method,
 590                   struct blob_attr *msg)
 591 {
 592         struct rpc_session *ses;
 593         struct blob_attr *tb[__RPC_SP_MAX];
 594         const char *scope = "ubus";
 595         bool allow;
 596
 597         blobmsg_parse(perm_policy, __RPC_SP_MAX, tb, blob_data(msg), blob_len(msg));
 598
 599         if (!tb[RPC_SP_SID])
 600                 return UBUS_STATUS_INVALID_ARGUMENT;
 601
 602         ses = rpc_session_get(blobmsg_data(tb[RPC_SP_SID]));
 603         if (!ses)
 604                 return UBUS_STATUS_NOT_FOUND;
 605
 606         blob_buf_init(&buf, 0);
 607
 608         if (tb[RPC_SP_OBJECT] && tb[RPC_SP_FUNCTION])
 609         {
 610                 if (tb[RPC_SP_SCOPE])
 611                         scope = blobmsg_data(tb[RPC_SP_SCOPE]);
 612
 613                 allow = rpc_session_acl_allowed(ses, scope,
 614                                                 blobmsg_data(tb[RPC_SP_OBJECT]),
 615                                                 blobmsg_data(tb[RPC_SP_FUNCTION]));
 616
 617                 blobmsg_add_u8(&buf, "access", allow);
 618         }
 619         else
 620         {
 621                 rpc_session_dump_acls(ses, &buf);
 622         }
 623
 624         ubus_send_reply(ctx, req, buf.head);
 625
 626         return 0;
 627 }
 628
 629 static void
 630 rpc_session_set(struct rpc_session *ses, const char *key, struct blob_attr *val)
 631 {
 632         struct rpc_session_data *data;
 633
 634         data = avl_find_element(&ses->data, key, data, avl);
 635         if (data) {
 636                 avl_delete(&ses->data, &data->avl);
 637                 free(data);
 638         }
 639
 640         data = calloc(1, sizeof(*data) + blob_pad_len(val));
 641         if (!data)
 642                 return;
 643
 644         memcpy(data->attr, val, blob_pad_len(val));
 645         data->avl.key = blobmsg_name(data->attr);
 646         avl_insert(&ses->data, &data->avl);
 647 }
 648
 649 static int
 650 rpc_handle_set(struct ubus_context *ctx, struct ubus_object *obj,
 651                struct ubus_request_data *req, const char *method,
 652                struct blob_attr *msg)
 653 {
 654         struct rpc_session *ses;
 655         struct blob_attr *tb[__RPC_SS_MAX];
 656         struct blob_attr *attr;
 657         int rem;
 658
 659         blobmsg_parse(set_policy, __RPC_SS_MAX, tb, blob_data(msg), blob_len(msg));
 660
 661         if (!tb[RPC_SS_SID] || !tb[RPC_SS_VALUES])
 662                 return UBUS_STATUS_INVALID_ARGUMENT;
 663
 664         ses = rpc_session_get(blobmsg_data(tb[RPC_SS_SID]));
 665         if (!ses)
 666                 return UBUS_STATUS_NOT_FOUND;
 667
 668         blobmsg_for_each_attr(attr, tb[RPC_SS_VALUES], rem) {
 669                 if (!blobmsg_name(attr)[0])
 670                         continue;
 671
 672                 rpc_session_set(ses, blobmsg_name(attr), attr);
 673         }
 674
 675         return 0;
 676 }
 677
 678 static int
 679 rpc_handle_get(struct ubus_context *ctx, struct ubus_object *obj,
 680                struct ubus_request_data *req, const char *method,
 681                struct blob_attr *msg)
 682 {
 683         struct rpc_session *ses;
 684         struct rpc_session_data *data;
 685         struct blob_attr *tb[__RPC_SG_MAX];
 686         struct blob_attr *attr;
 687         void *c;
 688         int rem;
 689
 690         blobmsg_parse(get_policy, __RPC_SG_MAX, tb, blob_data(msg), blob_len(msg));
 691
 692         if (!tb[RPC_SG_SID])
 693                 return UBUS_STATUS_INVALID_ARGUMENT;
 694
 695         ses = rpc_session_get(blobmsg_data(tb[RPC_SG_SID]));
 696         if (!ses)
 697                 return UBUS_STATUS_NOT_FOUND;
 698
 699         blob_buf_init(&buf, 0);
 700         c = blobmsg_open_table(&buf, "values");
 701
 702         if (tb[RPC_SG_KEYS])
 703                 blobmsg_for_each_attr(attr, tb[RPC_SG_KEYS], rem) {
 704                         if (blobmsg_type(attr) != BLOBMSG_TYPE_STRING)
 705                                 continue;
 706
 707                         data = avl_find_element(&ses->data, blobmsg_data(attr), data, avl);
 708                         if (!data)
 709                                 continue;
 710
 711                         blobmsg_add_field(&buf, blobmsg_type(data->attr),
 712                                           blobmsg_name(data->attr),
 713                                           blobmsg_data(data->attr),
 714                                           blobmsg_data_len(data->attr));
 715                 }
 716         else
 717                 rpc_session_dump_data(ses, &buf);
 718
 719         blobmsg_close_table(&buf, c);
 720         ubus_send_reply(ctx, req, buf.head);
 721
 722         return 0;
 723 }
 724
 725 static int
 726 rpc_handle_unset(struct ubus_context *ctx, struct ubus_object *obj,
 727                  struct ubus_request_data *req, const char *method,
 728                  struct blob_attr *msg)
 729 {
 730         struct rpc_session *ses;
 731         struct rpc_session_data *data, *ndata;
 732         struct blob_attr *tb[__RPC_SA_MAX];
 733         struct blob_attr *attr;
 734         int rem;
 735
 736         blobmsg_parse(get_policy, __RPC_SG_MAX, tb, blob_data(msg), blob_len(msg));
 737
 738         if (!tb[RPC_SG_SID])
 739                 return UBUS_STATUS_INVALID_ARGUMENT;
 740
 741         ses = rpc_session_get(blobmsg_data(tb[RPC_SG_SID]));
 742         if (!ses)
 743                 return UBUS_STATUS_NOT_FOUND;
 744
 745         if (!tb[RPC_SG_KEYS]) {
 746                 avl_remove_all_elements(&ses->data, data, avl, ndata)
 747                         free(data);
 748                 return 0;
 749         }
 750
 751         blobmsg_for_each_attr(attr, tb[RPC_SG_KEYS], rem) {
 752                 if (blobmsg_type(attr) != BLOBMSG_TYPE_STRING)
 753                         continue;
 754
 755                 data = avl_find_element(&ses->data, blobmsg_data(attr), data, avl);
 756                 if (!data)
 757                         continue;
 758
 759                 avl_delete(&ses->data, &data->avl);
 760                 free(data);
 761         }
 762
 763         return 0;
 764 }
 765
 766 static int
 767 rpc_handle_destroy(struct ubus_context *ctx, struct ubus_object *obj,
 768                    struct ubus_request_data *req, const char *method,
 769                    struct blob_attr *msg)
 770 {
 771         struct rpc_session *ses;
 772         struct blob_attr *tb;
 773
 774         blobmsg_parse(sid_policy, __RPC_SI_MAX, &tb, blob_data(msg), blob_len(msg));
 775
 776         if (!tb)
 777                 return UBUS_STATUS_INVALID_ARGUMENT;
 778
 779         if (!strcmp(blobmsg_get_string(tb), RPC_DEFAULT_SESSION_ID))
 780                 return UBUS_STATUS_PERMISSION_DENIED;
 781
 782         ses = rpc_session_get(blobmsg_data(tb));
 783         if (!ses)
 784                 return UBUS_STATUS_NOT_FOUND;
 785
 786         rpc_session_destroy(ses);
 787
 788         return 0;
 789 }
 790
 791
 792 static bool
 793 rpc_login_test_password(const char *hash, const char *password)
 794 {
 795         char *crypt_hash;
 796
 797         /* password is not set */
 798         if (!hash || !*hash || !strcmp(hash, "!") || !strcmp(hash, "x"))
 799         {
 800                 return true;
 801         }
 802
 803         /* password hash refers to shadow/passwd */
 804         else if (!strncmp(hash, "$p$", 3))
 805         {
 806 #ifdef HAVE_SHADOW
 807                 struct spwd *sp = getspnam(hash + 3);
 808
 809                 if (!sp)
 810                         return false;
 811
 812                 return rpc_login_test_password(sp->sp_pwdp, password);
 813 #else
 814                 struct passwd *pw = getpwnam(hash + 3);
 815
 816                 if (!pw)
 817                         return false;
 818
 819                 return rpc_login_test_password(pw->pw_passwd, password);
 820 #endif
 821         }
 822
 823         crypt_hash = crypt(password, hash);
 824
 825         return !strcmp(crypt_hash, hash);
 826 }
 827
 828 static struct uci_section *
 829 rpc_login_test_login(struct uci_context *uci,
 830                      const char *username, const char *password)
 831 {
 832         struct uci_package *p = NULL;
 833         struct uci_section *s;
 834         struct uci_element *e;
 835         struct uci_ptr ptr = { .package = "rpcd" };
 836
 837         uci_load(uci, ptr.package, &p);
 838
 839         if (!p)
 840                 return false;
 841
 842         uci_foreach_element(&p->sections, e)
 843         {
 844                 s = uci_to_section(e);
 845
 846                 if (strcmp(s->type, "login"))
 847                         continue;
 848
 849                 ptr.section = s->e.name;
 850                 ptr.s = NULL;
 851
 852                 /* test for matching username */
 853                 ptr.option = "username";
 854                 ptr.o = NULL;
 855
 856                 if (uci_lookup_ptr(uci, &ptr, NULL, true))
 857                         continue;
 858
 859                 if (ptr.o->type != UCI_TYPE_STRING)
 860                         continue;
 861
 862                 if (strcmp(ptr.o->v.string, username))
 863                         continue;
 864
 865                 /* If password is NULL, we're restoring ACLs for an existing session,
 866                  * in this case do not check the password again. */
 867                 if (!password)
 868                         return ptr.s;
 869
 870                 /* test for matching password */
 871                 ptr.option = "password";
 872                 ptr.o = NULL;
 873
 874                 if (uci_lookup_ptr(uci, &ptr, NULL, true))
 875                         continue;
 876
 877                 if (ptr.o->type != UCI_TYPE_STRING)
 878                         continue;
 879
 880                 if (rpc_login_test_password(ptr.o->v.string, password))
 881                         return ptr.s;
 882         }
 883
 884         return NULL;
 885 }
 886
 887 static bool
 888 rpc_login_test_permission(struct uci_section *s,
 889                           const char *perm, const char *group)
 890 {
 891         const char *p;
 892         struct uci_option *o;
 893         struct uci_element *e, *l;
 894
 895         /* If the login section is not provided, we're setting up acls for the
 896          * default session, in this case uncondionally allow access to the
 897          * "unauthenticated" access group */
 898         if (!s) {
 899                 return !strcmp(group, "unauthenticated");
 900         }
 901
 902         uci_foreach_element(&s->options, e)
 903         {
 904                 o = uci_to_option(e);
 905
 906                 if (o->type != UCI_TYPE_LIST)
 907                         continue;
 908
 909                 if (strcmp(o->e.name, perm))
 910                         continue;
 911
 912                 /* Match negative expressions first. If a negative expression matches
 913                  * the current group name then deny access. */
 914                 uci_foreach_element(&o->v.list, l) {
 915                         p = l->name;
 916
 917                         if (!p || *p != '!')
 918                                 continue;
 919
 920                         while (isspace(*++p));
 921
 922                         if (!*p)
 923                                 continue;
 924
 925                         if (!fnmatch(p, group, 0))
 926                                 return false;
 927                 }
 928
 929                 uci_foreach_element(&o->v.list, l) {
 930                         if (!l->name || !*l->name || *l->name == '!')
 931                                 continue;
 932
 933                         if (!fnmatch(l->name, group, 0))
 934                                 return true;
 935                 }
 936         }
 937
 938         /* make sure that write permission implies read permission */
 939         if (!strcmp(perm, "read"))
 940                 return rpc_login_test_permission(s, "write", group);
 941
 942         return false;
 943 }
 944
 945 static void
 946 rpc_login_setup_acl_scope(struct rpc_session *ses,
 947                           struct blob_attr *acl_perm,
 948                           struct blob_attr *acl_scope)
 949 {
 950         struct blob_attr *acl_obj, *acl_func;
 951         int rem, rem2;
 952
 953         /*
 954          * Parse ACL scopes in table notation.
 955          *
 956          *      "<scope>": {
 957          *              "<object>": [
 958          *                      "<function>",
 959          *                      "<function>",
 960          *                      ...
 961          *              ]
 962          *      }
 963          */
 964         if (blobmsg_type(acl_scope) == BLOBMSG_TYPE_TABLE) {
 965                 blobmsg_for_each_attr(acl_obj, acl_scope, rem) {
 966                         if (blobmsg_type(acl_obj) != BLOBMSG_TYPE_ARRAY)
 967                                 continue;
 968
 969                         blobmsg_for_each_attr(acl_func, acl_obj, rem2) {
 970                                 if (blobmsg_type(acl_func) != BLOBMSG_TYPE_STRING)
 971                                         continue;
 972
 973                                 rpc_session_grant(ses, blobmsg_name(acl_scope),
 974                                                        blobmsg_name(acl_obj),
 975                                                        blobmsg_data(acl_func));
 976                         }
 977                 }
 978         }
 979
 980         /*
 981          * Parse ACL scopes in array notation. The permission ("read" or "write")
 982          * will be used as function name for each object.
 983          *
 984          *      "<scope>": [
 985          *              "<object>",
 986          *              "<object>",
 987          *              ...
 988          *      ]
 989          */
 990         else if (blobmsg_type(acl_scope) == BLOBMSG_TYPE_ARRAY) {
 991                 blobmsg_for_each_attr(acl_obj, acl_scope, rem) {
 992                         if (blobmsg_type(acl_obj) != BLOBMSG_TYPE_STRING)
 993                                 continue;
 994
 995                         rpc_session_grant(ses, blobmsg_name(acl_scope),
 996                                                blobmsg_data(acl_obj),
 997                                                blobmsg_name(acl_perm));
 998                 }
 999         }
1000 }
1001
1002 static void
1003 rpc_login_setup_acl_file(struct rpc_session *ses, struct uci_section *login,
1004                          const char *path)
1005 {
1006         struct blob_buf acl = { 0 };
1007         struct blob_attr *acl_group, *acl_perm, *acl_scope;
1008         int rem, rem2, rem3;
1009
1010         blob_buf_init(&acl, 0);
1011
1012         if (!blobmsg_add_json_from_file(&acl, path)) {
1013                 fprintf(stderr, "Failed to parse %s\n", path);
1014                 goto out;
1015         }
1016
1017         /* Iterate access groups in toplevel object */
1018         blob_for_each_attr(acl_group, acl.head, rem) {
1019                 /* Iterate permission objects in each access group object */
1020                 blobmsg_for_each_attr(acl_perm, acl_group, rem2) {
1021                         if (blobmsg_type(acl_perm) != BLOBMSG_TYPE_TABLE)
1022                                 continue;
1023
1024                         /* Only "read" and "write" permissions are defined */
1025                         if (strcmp(blobmsg_name(acl_perm), "read") &&
1026                                 strcmp(blobmsg_name(acl_perm), "write"))
1027                                 continue;
1028
1029                         /*
1030                          * Check if the current user context specifies the current
1031                          * "read" or "write" permission in the given access group.
1032                          */
1033                         if (!rpc_login_test_permission(login, blobmsg_name(acl_perm),
1034                                                               blobmsg_name(acl_group)))
1035                                 continue;
1036
1037                         /* Iterate scope objects within the permission object */
1038                         blobmsg_for_each_attr(acl_scope, acl_perm, rem3) {
1039                                 /* Setup the scopes of the access group */
1040                                 rpc_login_setup_acl_scope(ses, acl_perm, acl_scope);
1041
1042                                 /*
1043                                  * Add the access group itself as object to the "access-group"
1044                                  * meta scope and the the permission level ("read" or "write")
1045                                  * as function, so
1046                                  *      "<group>": {
1047                                  *              "<permission>": {
1048                                  *                      "<scope>": ...
1049                                  *              }
1050                                  *      }
1051                                  * becomes
1052                                  *      "access-group": {
1053                                  *              "<group>": [
1054                                  *                      "<permission>"
1055                                  *              ]
1056                                  *      }
1057                                  *
1058                                  * This allows session clients to easily query the allowed
1059                                  * access groups without having to test access of each single
1060                                  * <scope>/<object>/<function> tuple defined in a group.
1061                                  */
1062                                 rpc_session_grant(ses, "access-group",
1063                                                        blobmsg_name(acl_group),
1064                                                        blobmsg_name(acl_perm));
1065                         }
1066                 }
1067         }
1068
1069 out:
1070         blob_buf_free(&acl);
1071 }
1072
1073 static void
1074 rpc_login_setup_acls(struct rpc_session *ses, struct uci_section *login)
1075 {
1076         int i;
1077         glob_t gl;
1078
1079         if (glob(RPC_SESSION_ACL_DIR "/*.json", 0, NULL, &gl))
1080                 return;
1081
1082         for (i = 0; i < gl.gl_pathc; i++)
1083                 rpc_login_setup_acl_file(ses, login, gl.gl_pathv[i]);
1084
1085         globfree(&gl);
1086 }
1087
1088 static int
1089 rpc_handle_login(struct ubus_context *ctx, struct ubus_object *obj,
1090                  struct ubus_request_data *req, const char *method,
1091                  struct blob_attr *msg)
1092 {
1093         struct uci_context *uci = NULL;
1094         struct uci_section *login;
1095         struct rpc_session *ses;
1096         struct blob_attr *tb[__RPC_L_MAX];
1097         int timeout = RPC_DEFAULT_SESSION_TIMEOUT;
1098         int rv = 0;
1099
1100         blobmsg_parse(login_policy, __RPC_L_MAX, tb, blob_data(msg), blob_len(msg));
1101
1102         if (!tb[RPC_L_USERNAME] || !tb[RPC_L_PASSWORD]) {
1103                 rv = UBUS_STATUS_INVALID_ARGUMENT;
1104                 goto out;
1105         }
1106
1107         uci = uci_alloc_context();
1108
1109         if (!uci) {
1110                 rv = UBUS_STATUS_UNKNOWN_ERROR;
1111                 goto out;
1112         }
1113
1114         login = rpc_login_test_login(uci, blobmsg_get_string(tb[RPC_L_USERNAME]),
1115                                           blobmsg_get_string(tb[RPC_L_PASSWORD]));
1116
1117         if (!login) {
1118                 rv = UBUS_STATUS_PERMISSION_DENIED;
1119                 goto out;
1120         }
1121
1122         if (tb[RPC_L_TIMEOUT])
1123                 timeout = blobmsg_get_u32(tb[RPC_L_TIMEOUT]);
1124
1125         ses = rpc_session_create(timeout);
1126
1127         if (!ses) {
1128                 rv = UBUS_STATUS_UNKNOWN_ERROR;
1129                 goto out;
1130         }
1131
1132         rpc_login_setup_acls(ses, login);
1133
1134         rpc_session_set(ses, "user", tb[RPC_L_USERNAME]);
1135         rpc_session_dump(ses, ctx, req);
1136
1137 out:
1138         if (uci)
1139                 uci_free_context(uci);
1140
1141         return rv;
1142 }
1143
1144
1145 static bool
1146 rpc_validate_sid(const char *id)
1147 {
1148         if (!id)
1149                 return false;
1150
1151         if (strlen(id) != RPC_SID_LEN)
1152                 return false;
1153
1154         while (*id)
1155                 if (!isxdigit(*id++))
1156                         return false;
1157
1158         return true;
1159 }
1160
1161 static int
1162 rpc_blob_to_file(const char *path, struct blob_attr *attr)
1163 {
1164         int fd, len;
1165
1166         fd = open(path, O_WRONLY | O_CREAT | O_EXCL, 0600);
1167
1168         if (fd < 0)
1169                 return fd;
1170
1171         len = write(fd, attr, blob_pad_len(attr));
1172
1173         close(fd);
1174
1175         if (len != blob_pad_len(attr))
1176         {
1177                 unlink(path);
1178                 return -1;
1179         }
1180
1181         return len;
1182 }
1183
1184 static struct blob_attr *
1185 rpc_blob_from_file(const char *path)
1186 {
1187         int fd = -1, len;
1188         struct stat s;
1189         struct blob_attr head, *attr = NULL;
1190
1191         if (stat(path, &s) || !S_ISREG(s.st_mode))
1192                 return NULL;
1193
1194         fd = open(path, O_RDONLY);
1195
1196         if (fd < 0)
1197                 goto fail;
1198
1199         len = read(fd, &head, sizeof(head));
1200
1201         if (len != sizeof(head) || blob_pad_len(&head) != s.st_size)
1202                 goto fail;
1203
1204         attr = calloc(1, s.st_size);
1205
1206         if (!attr)
1207                 goto fail;
1208
1209         memcpy(attr, &head, sizeof(head));
1210
1211         len += read(fd, (char *)attr + sizeof(head), s.st_size - sizeof(head));
1212
1213         if (len != blob_pad_len(&head))
1214                 goto fail;
1215
1216         close(fd);
1217
1218         return attr;
1219
1220 fail:
1221         if (fd >= 0)
1222                 close(fd);
1223
1224         if (attr)
1225                 free(attr);
1226
1227         return NULL;
1228 }
1229
1230 static bool
1231 rpc_session_from_blob(struct uci_context *uci, struct blob_attr *attr)
1232 {
1233         int i, rem;
1234         const char *user = NULL;
1235         struct rpc_session *ses;
1236         struct uci_section *login;
1237         struct blob_attr *tb[__RPC_DUMP_MAX], *data;
1238
1239         blobmsg_parse(dump_policy, __RPC_DUMP_MAX, tb,
1240                       blob_data(attr), blob_len(attr));
1241
1242         for (i = 0; i < __RPC_DUMP_MAX; i++)
1243                 if (!tb[i])
1244                         return false;
1245
1246         ses = rpc_session_new();
1247
1248         if (!ses)
1249                 return false;
1250
1251         memcpy(ses->id, blobmsg_data(tb[RPC_DUMP_SID]), RPC_SID_LEN);
1252
1253         ses->timeout = blobmsg_get_u32(tb[RPC_DUMP_TIMEOUT]);
1254
1255         blobmsg_for_each_attr(data, tb[RPC_DUMP_DATA], rem) {
1256                 rpc_session_set(ses, blobmsg_name(data), data);
1257
1258                 if (!strcmp(blobmsg_name(data), "username"))
1259                         user = blobmsg_get_string(data);
1260         }
1261
1262         if (uci && user) {
1263                 login = rpc_login_test_login(uci, user, NULL);
1264                 if (login)
1265                         rpc_login_setup_acls(ses, login);
1266         }
1267
1268         avl_insert(&sessions, &ses->avl);
1269
1270         uloop_timeout_set(&ses->t, blobmsg_get_u32(tb[RPC_DUMP_EXPIRES]) * 1000);
1271
1272         return true;
1273 }
1274
1275 int rpc_session_api_init(struct ubus_context *ctx)
1276 {
1277         struct rpc_session *ses;
1278
1279         static const struct ubus_method session_methods[] = {
1280                 UBUS_METHOD("create",  rpc_handle_create,  new_policy),
1281                 UBUS_METHOD("list",    rpc_handle_list,    sid_policy),
1282                 UBUS_METHOD("grant",   rpc_handle_acl,     acl_policy),
1283                 UBUS_METHOD("revoke",  rpc_handle_acl,     acl_policy),
1284                 UBUS_METHOD("access",  rpc_handle_access,  perm_policy),
1285                 UBUS_METHOD("set",     rpc_handle_set,     set_policy),
1286                 UBUS_METHOD("get",     rpc_handle_get,     get_policy),
1287                 UBUS_METHOD("unset",   rpc_handle_unset,   get_policy),
1288                 UBUS_METHOD("destroy", rpc_handle_destroy, sid_policy),
1289                 UBUS_METHOD("login",   rpc_handle_login,   login_policy),
1290         };
1291
1292         static struct ubus_object_type session_type =
1293                 UBUS_OBJECT_TYPE("luci-rpc-session", session_methods);
1294
1295         static struct ubus_object obj = {
1296                 .name = "session",
1297                 .type = &session_type,
1298                 .methods = session_methods,
1299                 .n_methods = ARRAY_SIZE(session_methods),
1300         };
1301
1302         avl_init(&sessions, avl_strcmp, false, NULL);
1303
1304         /* setup the default session */
1305         ses = rpc_session_new();
1306
1307         if (ses) {
1308                 strcpy(ses->id, RPC_DEFAULT_SESSION_ID);
1309                 rpc_login_setup_acls(ses, NULL);
1310                 avl_insert(&sessions, &ses->avl);
1311         }
1312
1313         return ubus_add_object(ctx, &obj);
1314 }
1315
1316 bool rpc_session_access(const char *sid, const char *scope,
1317                         const char *object, const char *function)
1318 {
1319         struct rpc_session *ses = rpc_session_get(sid);
1320
1321         if (!ses)
1322                 return false;
1323
1324         return rpc_session_acl_allowed(ses, scope, object, function);
1325 }
1326
1327 void rpc_session_create_cb(struct rpc_session_cb *cb)
1328 {
1329         if (cb && cb->cb)
1330                 list_add(&cb->list, &create_callbacks);
1331 }
1332
1333 void rpc_session_destroy_cb(struct rpc_session_cb *cb)
1334 {
1335         if (cb && cb->cb)
1336                 list_add(&cb->list, &destroy_callbacks);
1337 }
1338
1339 void rpc_session_freeze(void)
1340 {
1341         struct stat s;
1342         struct rpc_session *ses;
1343         char path[PATH_MAX];
1344
1345         if (stat(RPC_SESSION_DIRECTORY, &s))
1346                 mkdir(RPC_SESSION_DIRECTORY, 0700);
1347
1348         avl_for_each_element(&sessions, ses, avl) {
1349                 /* skip default session */
1350                 if (!strcmp(ses->id, RPC_DEFAULT_SESSION_ID))
1351                         continue;
1352
1353                 snprintf(path, sizeof(path) - 1, RPC_SESSION_DIRECTORY "/%s", ses->id);
1354                 rpc_session_to_blob(ses, false);
1355                 rpc_blob_to_file(path, buf.head);
1356         }
1357 }
1358
1359 void rpc_session_thaw(void)
1360 {
1361         DIR *d;
1362         char path[PATH_MAX];
1363         struct dirent *e;
1364         struct blob_attr *attr;
1365         struct uci_context *uci;
1366
1367         d = opendir(RPC_SESSION_DIRECTORY);
1368
1369         if (!d)
1370                 return;
1371
1372         uci = uci_alloc_context();
1373
1374         if (!uci)
1375                 return;
1376
1377         while ((e = readdir(d)) != NULL) {
1378                 if (!rpc_validate_sid(e->d_name))
1379                         continue;
1380
1381                 snprintf(path, sizeof(path) - 1,
1382                          RPC_SESSION_DIRECTORY "/%s", e->d_name);
1383
1384                 attr = rpc_blob_from_file(path);
1385
1386                 if (attr) {
1387                         rpc_session_from_blob(uci, attr);
1388                         free(attr);
1389                 }
1390
1391                 unlink(path);
1392         }
1393
1394         closedir(d);
1395
1396         uci_free_context(uci);
1397 }