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