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file: show "data" ubus parameter only when used
[project/rpcd.git] / 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 }
OpenWrt ubus RPC daemon