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fc5f19b869d93f729282f74a58fbf6c2299deb16
[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 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
30 #ifdef HAVE_SHADOW
31 #include <shadow.h>
32 #endif
33
34 #include <rpcd/session.h>
35
36 static struct avl_tree sessions;
37 static struct blob_buf buf;
38
39 static LIST_HEAD(create_callbacks);
40 static LIST_HEAD(destroy_callbacks);
41
42 static const struct blobmsg_policy new_policy = {
43 .name = "timeout", .type = BLOBMSG_TYPE_INT32
44 };
45
46 static const struct blobmsg_policy sid_policy = {
47 .name = "sid", .type = BLOBMSG_TYPE_STRING
48 };
49
50 enum {
51 RPC_SS_SID,
52 RPC_SS_VALUES,
53 __RPC_SS_MAX,
54 };
55 static const struct blobmsg_policy set_policy[__RPC_SS_MAX] = {
56 [RPC_SS_SID] = { .name = "sid", .type = BLOBMSG_TYPE_STRING },
57 [RPC_SS_VALUES] = { .name = "values", .type = BLOBMSG_TYPE_TABLE },
58 };
59
60 enum {
61 RPC_SG_SID,
62 RPC_SG_KEYS,
63 __RPC_SG_MAX,
64 };
65 static const struct blobmsg_policy get_policy[__RPC_SG_MAX] = {
66 [RPC_SG_SID] = { .name = "sid", .type = BLOBMSG_TYPE_STRING },
67 [RPC_SG_KEYS] = { .name = "keys", .type = BLOBMSG_TYPE_ARRAY },
68 };
69
70 enum {
71 RPC_SA_SID,
72 RPC_SA_SCOPE,
73 RPC_SA_OBJECTS,
74 __RPC_SA_MAX,
75 };
76 static const struct blobmsg_policy acl_policy[__RPC_SA_MAX] = {
77 [RPC_SA_SID] = { .name = "sid", .type = BLOBMSG_TYPE_STRING },
78 [RPC_SA_SCOPE] = { .name = "scope", .type = BLOBMSG_TYPE_STRING },
79 [RPC_SA_OBJECTS] = { .name = "objects", .type = BLOBMSG_TYPE_ARRAY },
80 };
81
82 enum {
83 RPC_SP_SID,
84 RPC_SP_SCOPE,
85 RPC_SP_OBJECT,
86 RPC_SP_FUNCTION,
87 __RPC_SP_MAX,
88 };
89 static const struct blobmsg_policy perm_policy[__RPC_SP_MAX] = {
90 [RPC_SP_SID] = { .name = "sid", .type = BLOBMSG_TYPE_STRING },
91 [RPC_SP_SCOPE] = { .name = "scope", .type = BLOBMSG_TYPE_STRING },
92 [RPC_SP_OBJECT] = { .name = "object", .type = BLOBMSG_TYPE_STRING },
93 [RPC_SP_FUNCTION] = { .name = "function", .type = BLOBMSG_TYPE_STRING },
94 };
95
96 enum {
97 RPC_DUMP_SID,
98 RPC_DUMP_TIMEOUT,
99 RPC_DUMP_EXPIRES,
100 RPC_DUMP_ACLS,
101 RPC_DUMP_DATA,
102 __RPC_DUMP_MAX,
103 };
104 static const struct blobmsg_policy dump_policy[__RPC_DUMP_MAX] = {
105 [RPC_DUMP_SID] = { .name = "sid", .type = BLOBMSG_TYPE_STRING },
106 [RPC_DUMP_TIMEOUT] = { .name = "timeout", .type = BLOBMSG_TYPE_INT32 },
107 [RPC_DUMP_EXPIRES] = { .name = "expires", .type = BLOBMSG_TYPE_INT32 },
108 [RPC_DUMP_ACLS] = { .name = "acls", .type = BLOBMSG_TYPE_TABLE },
109 [RPC_DUMP_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
110 };
111
112 enum {
113 RPC_L_USERNAME,
114 RPC_L_PASSWORD,
115 RPC_L_TIMEOUT,
116 __RPC_L_MAX,
117 };
118 static const struct blobmsg_policy login_policy[__RPC_L_MAX] = {
119 [RPC_L_USERNAME] = { .name = "username", .type = BLOBMSG_TYPE_STRING },
120 [RPC_L_PASSWORD] = { .name = "password", .type = BLOBMSG_TYPE_STRING },
121 [RPC_L_TIMEOUT] = { .name = "timeout", .type = BLOBMSG_TYPE_INT32 },
122 };
123
124 /*
125 * Keys in the AVL tree contain all pattern characters up to the first wildcard.
126 * To look up entries, start with the last entry that has a key less than or
127 * equal to the method name, then work backwards as long as the AVL key still
128 * matches its counterpart in the object name
129 */
130 #define uh_foreach_matching_acl_prefix(_acl, _avl, _obj, _func) \
131 for (_acl = avl_find_le_element(_avl, _obj, _acl, avl); \
132 _acl; \
133 _acl = avl_is_first(_avl, &(_acl)->avl) ? NULL : \
134 avl_prev_element((_acl), avl))
135
136 #define uh_foreach_matching_acl(_acl, _avl, _obj, _func) \
137 uh_foreach_matching_acl_prefix(_acl, _avl, _obj, _func) \
138 if (!strncmp((_acl)->object, _obj, (_acl)->sort_len) && \
139 !fnmatch((_acl)->object, (_obj), FNM_NOESCAPE) && \
140 !fnmatch((_acl)->function, (_func), FNM_NOESCAPE))
141
142 static void
143 rpc_random(char *dest)
144 {
145 unsigned char buf[16] = { 0 };
146 FILE *f;
147 int i;
148
149 f = fopen("/dev/urandom", "r");
150 if (!f)
151 return;
152
153 fread(buf, 1, sizeof(buf), f);
154 fclose(f);
155
156 for (i = 0; i < sizeof(buf); i++)
157 sprintf(dest + (i<<1), "%02x", buf[i]);
158 }
159
160 static void
161 rpc_session_dump_data(struct rpc_session *ses, struct blob_buf *b)
162 {
163 struct rpc_session_data *d;
164
165 avl_for_each_element(&ses->data, d, avl) {
166 blobmsg_add_field(b, blobmsg_type(d->attr), blobmsg_name(d->attr),
167 blobmsg_data(d->attr), blobmsg_data_len(d->attr));
168 }
169 }
170
171 static void
172 rpc_session_dump_acls(struct rpc_session *ses, struct blob_buf *b)
173 {
174 struct rpc_session_acl *acl;
175 struct rpc_session_acl_scope *acl_scope;
176 const char *lastobj = NULL;
177 const char *lastscope = NULL;
178 void *c = NULL, *d = NULL;
179
180 avl_for_each_element(&ses->acls, acl_scope, avl) {
181 if (!lastscope || strcmp(acl_scope->avl.key, lastscope))
182 {
183 if (c) blobmsg_close_table(b, c);
184 c = blobmsg_open_table(b, acl_scope->avl.key);
185 lastobj = NULL;
186 }
187
188 d = NULL;
189
190 avl_for_each_element(&acl_scope->acls, acl, avl) {
191 if (!lastobj || strcmp(acl->object, lastobj))
192 {
193 if (d) blobmsg_close_array(b, d);
194 d = blobmsg_open_array(b, acl->object);
195 }
196
197 blobmsg_add_string(b, NULL, acl->function);
198 lastobj = acl->object;
199 }
200
201 if (d) blobmsg_close_array(b, d);
202 }
203
204 if (c) blobmsg_close_table(b, c);
205 }
206
207 static void
208 rpc_session_to_blob(struct rpc_session *ses)
209 {
210 void *c;
211
212 blob_buf_init(&buf, 0);
213
214 blobmsg_add_string(&buf, "sid", ses->id);
215 blobmsg_add_u32(&buf, "timeout", ses->timeout);
216 blobmsg_add_u32(&buf, "expires", uloop_timeout_remaining(&ses->t) / 1000);
217
218 c = blobmsg_open_table(&buf, "acls");
219 rpc_session_dump_acls(ses, &buf);
220 blobmsg_close_table(&buf, c);
221
222 c = blobmsg_open_table(&buf, "data");
223 rpc_session_dump_data(ses, &buf);
224 blobmsg_close_table(&buf, c);
225 }
226
227 static void
228 rpc_session_dump(struct rpc_session *ses, struct ubus_context *ctx,
229 struct ubus_request_data *req)
230 {
231 rpc_session_to_blob(ses);
232
233 ubus_send_reply(ctx, req, buf.head);
234 }
235
236 static void
237 rpc_touch_session(struct rpc_session *ses)
238 {
239 if (ses->timeout > 0)
240 uloop_timeout_set(&ses->t, ses->timeout * 1000);
241 }
242
243 static void
244 rpc_session_destroy(struct rpc_session *ses)
245 {
246 struct rpc_session_acl *acl, *nacl;
247 struct rpc_session_acl_scope *acl_scope, *nacl_scope;
248 struct rpc_session_data *data, *ndata;
249 struct rpc_session_cb *cb;
250
251 list_for_each_entry(cb, &destroy_callbacks, list)
252 cb->cb(ses, cb->priv);
253
254 uloop_timeout_cancel(&ses->t);
255
256 avl_for_each_element_safe(&ses->acls, acl_scope, avl, nacl_scope) {
257 avl_remove_all_elements(&acl_scope->acls, acl, avl, nacl)
258 free(acl);
259
260 avl_delete(&ses->acls, &acl_scope->avl);
261 free(acl_scope);
262 }
263
264 avl_remove_all_elements(&ses->data, data, avl, ndata)
265 free(data);
266
267 avl_delete(&sessions, &ses->avl);
268 free(ses);
269 }
270
271 static void rpc_session_timeout(struct uloop_timeout *t)
272 {
273 struct rpc_session *ses;
274
275 ses = container_of(t, struct rpc_session, t);
276 rpc_session_destroy(ses);
277 }
278
279 static struct rpc_session *
280 rpc_session_new(void)
281 {
282 struct rpc_session *ses;
283
284 ses = calloc(1, sizeof(*ses));
285
286 if (!ses)
287 return NULL;
288
289 ses->avl.key = ses->id;
290
291 avl_init(&ses->acls, avl_strcmp, true, NULL);
292 avl_init(&ses->data, avl_strcmp, false, NULL);
293
294 ses->t.cb = rpc_session_timeout;
295
296 return ses;
297 }
298
299 static struct rpc_session *
300 rpc_session_create(int timeout)
301 {
302 struct rpc_session *ses;
303 struct rpc_session_cb *cb;
304
305 ses = rpc_session_new();
306
307 if (!ses)
308 return NULL;
309
310 rpc_random(ses->id);
311
312 ses->timeout = timeout;
313
314 avl_insert(&sessions, &ses->avl);
315
316 rpc_touch_session(ses);
317
318 list_for_each_entry(cb, &create_callbacks, list)
319 cb->cb(ses, cb->priv);
320
321 return ses;
322 }
323
324 static struct rpc_session *
325 rpc_session_get(const char *id)
326 {
327 struct rpc_session *ses;
328
329 ses = avl_find_element(&sessions, id, ses, avl);
330 if (!ses)
331 return NULL;
332
333 rpc_touch_session(ses);
334 return ses;
335 }
336
337 static int
338 rpc_handle_create(struct ubus_context *ctx, struct ubus_object *obj,
339 struct ubus_request_data *req, const char *method,
340 struct blob_attr *msg)
341 {
342 struct rpc_session *ses;
343 struct blob_attr *tb;
344 int timeout = RPC_DEFAULT_SESSION_TIMEOUT;
345
346 blobmsg_parse(&new_policy, 1, &tb, blob_data(msg), blob_len(msg));
347 if (tb)
348 timeout = blobmsg_get_u32(tb);
349
350 ses = rpc_session_create(timeout);
351 if (ses)
352 rpc_session_dump(ses, ctx, req);
353
354 return 0;
355 }
356
357 static int
358 rpc_handle_list(struct ubus_context *ctx, struct ubus_object *obj,
359 struct ubus_request_data *req, const char *method,
360 struct blob_attr *msg)
361 {
362 struct rpc_session *ses;
363 struct blob_attr *tb;
364
365 blobmsg_parse(&sid_policy, 1, &tb, blob_data(msg), blob_len(msg));
366
367 if (!tb) {
368 avl_for_each_element(&sessions, ses, avl)
369 rpc_session_dump(ses, ctx, req);
370 return 0;
371 }
372
373 ses = rpc_session_get(blobmsg_data(tb));
374 if (!ses)
375 return UBUS_STATUS_NOT_FOUND;
376
377 rpc_session_dump(ses, ctx, req);
378
379 return 0;
380 }
381
382 static int
383 uh_id_len(const char *str)
384 {
385 return strcspn(str, "*?[");
386 }
387
388 static int
389 rpc_session_grant(struct rpc_session *ses, struct ubus_context *ctx,
390 const char *scope, const char *object, const char *function)
391 {
392 struct rpc_session_acl *acl;
393 struct rpc_session_acl_scope *acl_scope;
394 char *new_scope, *new_obj, *new_func, *new_id;
395 int id_len;
396
397 if (!object || !function)
398 return UBUS_STATUS_INVALID_ARGUMENT;
399
400 acl_scope = avl_find_element(&ses->acls, scope, acl_scope, avl);
401
402 if (acl_scope) {
403 uh_foreach_matching_acl_prefix(acl, &acl_scope->acls, object, function) {
404 if (!strcmp(acl->object, object) &&
405 !strcmp(acl->function, function))
406 return 0;
407 }
408 }
409
410 if (!acl_scope) {
411 acl_scope = calloc_a(sizeof(*acl_scope),
412 &new_scope, strlen(scope) + 1);
413
414 if (!acl_scope)
415 return UBUS_STATUS_UNKNOWN_ERROR;
416
417 acl_scope->avl.key = strcpy(new_scope, scope);
418 avl_init(&acl_scope->acls, avl_strcmp, true, NULL);
419 avl_insert(&ses->acls, &acl_scope->avl);
420 }
421
422 id_len = uh_id_len(object);
423 acl = calloc_a(sizeof(*acl),
424 &new_obj, strlen(object) + 1,
425 &new_func, strlen(function) + 1,
426 &new_id, id_len + 1);
427
428 if (!acl)
429 return UBUS_STATUS_UNKNOWN_ERROR;
430
431 acl->object = strcpy(new_obj, object);
432 acl->function = strcpy(new_func, function);
433 acl->avl.key = strncpy(new_id, object, id_len);
434 avl_insert(&acl_scope->acls, &acl->avl);
435
436 return 0;
437 }
438
439 static int
440 rpc_session_revoke(struct rpc_session *ses, struct ubus_context *ctx,
441 const char *scope, const char *object, const char *function)
442 {
443 struct rpc_session_acl *acl, *next;
444 struct rpc_session_acl_scope *acl_scope;
445 int id_len;
446 char *id;
447
448 acl_scope = avl_find_element(&ses->acls, scope, acl_scope, avl);
449
450 if (!acl_scope)
451 return 0;
452
453 if (!object && !function) {
454 avl_remove_all_elements(&acl_scope->acls, acl, avl, next)
455 free(acl);
456 avl_delete(&ses->acls, &acl_scope->avl);
457 free(acl_scope);
458 return 0;
459 }
460
461 id_len = uh_id_len(object);
462 id = alloca(id_len + 1);
463 strncpy(id, object, id_len);
464 id[id_len] = 0;
465
466 acl = avl_find_element(&acl_scope->acls, id, acl, avl);
467 while (acl) {
468 if (!avl_is_last(&acl_scope->acls, &acl->avl))
469 next = avl_next_element(acl, avl);
470 else
471 next = NULL;
472
473 if (strcmp(id, acl->avl.key) != 0)
474 break;
475
476 if (!strcmp(acl->object, object) &&
477 !strcmp(acl->function, function)) {
478 avl_delete(&acl_scope->acls, &acl->avl);
479 free(acl);
480 }
481 acl = next;
482 }
483
484 if (avl_is_empty(&acl_scope->acls)) {
485 avl_delete(&ses->acls, &acl_scope->avl);
486 free(acl_scope);
487 }
488
489 return 0;
490 }
491
492
493 static int
494 rpc_handle_acl(struct ubus_context *ctx, struct ubus_object *obj,
495 struct ubus_request_data *req, const char *method,
496 struct blob_attr *msg)
497 {
498 struct rpc_session *ses;
499 struct blob_attr *tb[__RPC_SA_MAX];
500 struct blob_attr *attr, *sattr;
501 const char *object, *function;
502 const char *scope = "ubus";
503 int rem1, rem2;
504
505 int (*cb)(struct rpc_session *ses, struct ubus_context *ctx,
506 const char *scope, const char *object, const char *function);
507
508 blobmsg_parse(acl_policy, __RPC_SA_MAX, tb, blob_data(msg), blob_len(msg));
509
510 if (!tb[RPC_SA_SID])
511 return UBUS_STATUS_INVALID_ARGUMENT;
512
513 ses = rpc_session_get(blobmsg_data(tb[RPC_SA_SID]));
514 if (!ses)
515 return UBUS_STATUS_NOT_FOUND;
516
517 if (tb[RPC_SA_SCOPE])
518 scope = blobmsg_data(tb[RPC_SA_SCOPE]);
519
520 if (!strcmp(method, "grant"))
521 cb = rpc_session_grant;
522 else
523 cb = rpc_session_revoke;
524
525 if (!tb[RPC_SA_OBJECTS])
526 return cb(ses, ctx, scope, NULL, NULL);
527
528 blobmsg_for_each_attr(attr, tb[RPC_SA_OBJECTS], rem1) {
529 if (blob_id(attr) != BLOBMSG_TYPE_ARRAY)
530 continue;
531
532 object = NULL;
533 function = NULL;
534
535 blobmsg_for_each_attr(sattr, attr, rem2) {
536 if (blob_id(sattr) != BLOBMSG_TYPE_STRING)
537 continue;
538
539 if (!object)
540 object = blobmsg_data(sattr);
541 else if (!function)
542 function = blobmsg_data(sattr);
543 else
544 break;
545 }
546
547 if (object && function)
548 cb(ses, ctx, scope, object, function);
549 }
550
551 return 0;
552 }
553
554 static bool
555 rpc_session_acl_allowed(struct rpc_session *ses, const char *scope,
556 const char *obj, const char *fun)
557 {
558 struct rpc_session_acl *acl;
559 struct rpc_session_acl_scope *acl_scope;
560
561 acl_scope = avl_find_element(&ses->acls, scope, acl_scope, avl);
562
563 if (acl_scope) {
564 uh_foreach_matching_acl(acl, &acl_scope->acls, obj, fun)
565 return true;
566 }
567
568 return false;
569 }
570
571 static int
572 rpc_handle_access(struct ubus_context *ctx, struct ubus_object *obj,
573 struct ubus_request_data *req, const char *method,
574 struct blob_attr *msg)
575 {
576 struct rpc_session *ses;
577 struct blob_attr *tb[__RPC_SP_MAX];
578 const char *scope = "ubus";
579 bool allow;
580
581 blobmsg_parse(perm_policy, __RPC_SP_MAX, tb, blob_data(msg), blob_len(msg));
582
583 if (!tb[RPC_SP_SID] || !tb[RPC_SP_OBJECT] || !tb[RPC_SP_FUNCTION])
584 return UBUS_STATUS_INVALID_ARGUMENT;
585
586 ses = rpc_session_get(blobmsg_data(tb[RPC_SP_SID]));
587 if (!ses)
588 return UBUS_STATUS_NOT_FOUND;
589
590 if (tb[RPC_SP_SCOPE])
591 scope = blobmsg_data(tb[RPC_SP_SCOPE]);
592
593 allow = rpc_session_acl_allowed(ses, scope,
594 blobmsg_data(tb[RPC_SP_OBJECT]),
595 blobmsg_data(tb[RPC_SP_FUNCTION]));
596
597 blob_buf_init(&buf, 0);
598 blobmsg_add_u8(&buf, "access", allow);
599 ubus_send_reply(ctx, req, buf.head);
600
601 return 0;
602 }
603
604 static void
605 rpc_session_set(struct rpc_session *ses, const char *key, struct blob_attr *val)
606 {
607 struct rpc_session_data *data;
608
609 data = avl_find_element(&ses->data, key, data, avl);
610 if (data) {
611 avl_delete(&ses->data, &data->avl);
612 free(data);
613 }
614
615 data = calloc(1, sizeof(*data) + blob_pad_len(val));
616 if (!data)
617 return;
618
619 memcpy(data->attr, val, blob_pad_len(val));
620 data->avl.key = blobmsg_name(data->attr);
621 avl_insert(&ses->data, &data->avl);
622 }
623
624 static int
625 rpc_handle_set(struct ubus_context *ctx, struct ubus_object *obj,
626 struct ubus_request_data *req, const char *method,
627 struct blob_attr *msg)
628 {
629 struct rpc_session *ses;
630 struct blob_attr *tb[__RPC_SA_MAX];
631 struct blob_attr *attr;
632 int rem;
633
634 blobmsg_parse(set_policy, __RPC_SS_MAX, tb, blob_data(msg), blob_len(msg));
635
636 if (!tb[RPC_SS_SID] || !tb[RPC_SS_VALUES])
637 return UBUS_STATUS_INVALID_ARGUMENT;
638
639 ses = rpc_session_get(blobmsg_data(tb[RPC_SS_SID]));
640 if (!ses)
641 return UBUS_STATUS_NOT_FOUND;
642
643 blobmsg_for_each_attr(attr, tb[RPC_SS_VALUES], rem) {
644 if (!blobmsg_name(attr)[0])
645 continue;
646
647 rpc_session_set(ses, blobmsg_name(attr), attr);
648 }
649
650 return 0;
651 }
652
653 static int
654 rpc_handle_get(struct ubus_context *ctx, struct ubus_object *obj,
655 struct ubus_request_data *req, const char *method,
656 struct blob_attr *msg)
657 {
658 struct rpc_session *ses;
659 struct rpc_session_data *data;
660 struct blob_attr *tb[__RPC_SA_MAX];
661 struct blob_attr *attr;
662 void *c;
663 int rem;
664
665 blobmsg_parse(get_policy, __RPC_SG_MAX, tb, blob_data(msg), blob_len(msg));
666
667 if (!tb[RPC_SG_SID])
668 return UBUS_STATUS_INVALID_ARGUMENT;
669
670 ses = rpc_session_get(blobmsg_data(tb[RPC_SG_SID]));
671 if (!ses)
672 return UBUS_STATUS_NOT_FOUND;
673
674 blob_buf_init(&buf, 0);
675 c = blobmsg_open_table(&buf, "values");
676
677 if (tb[RPC_SG_KEYS])
678 blobmsg_for_each_attr(attr, tb[RPC_SG_KEYS], rem) {
679 if (blob_id(attr) != BLOBMSG_TYPE_STRING)
680 continue;
681
682 data = avl_find_element(&ses->data, blobmsg_data(attr), data, avl);
683 if (!data)
684 continue;
685
686 blobmsg_add_field(&buf, blobmsg_type(data->attr),
687 blobmsg_name(data->attr),
688 blobmsg_data(data->attr),
689 blobmsg_data_len(data->attr));
690 }
691 else
692 rpc_session_dump_data(ses, &buf);
693
694 blobmsg_close_table(&buf, c);
695 ubus_send_reply(ctx, req, buf.head);
696
697 return 0;
698 }
699
700 static int
701 rpc_handle_unset(struct ubus_context *ctx, struct ubus_object *obj,
702 struct ubus_request_data *req, const char *method,
703 struct blob_attr *msg)
704 {
705 struct rpc_session *ses;
706 struct rpc_session_data *data, *ndata;
707 struct blob_attr *tb[__RPC_SA_MAX];
708 struct blob_attr *attr;
709 int rem;
710
711 blobmsg_parse(get_policy, __RPC_SG_MAX, tb, blob_data(msg), blob_len(msg));
712
713 if (!tb[RPC_SG_SID])
714 return UBUS_STATUS_INVALID_ARGUMENT;
715
716 ses = rpc_session_get(blobmsg_data(tb[RPC_SG_SID]));
717 if (!ses)
718 return UBUS_STATUS_NOT_FOUND;
719
720 if (!tb[RPC_SG_KEYS]) {
721 avl_remove_all_elements(&ses->data, data, avl, ndata)
722 free(data);
723 return 0;
724 }
725
726 blobmsg_for_each_attr(attr, tb[RPC_SG_KEYS], rem) {
727 if (blob_id(attr) != BLOBMSG_TYPE_STRING)
728 continue;
729
730 data = avl_find_element(&ses->data, blobmsg_data(attr), data, avl);
731 if (!data)
732 continue;
733
734 avl_delete(&ses->data, &data->avl);
735 free(data);
736 }
737
738 return 0;
739 }
740
741 static int
742 rpc_handle_destroy(struct ubus_context *ctx, struct ubus_object *obj,
743 struct ubus_request_data *req, const char *method,
744 struct blob_attr *msg)
745 {
746 struct rpc_session *ses;
747 struct blob_attr *tb;
748
749 blobmsg_parse(&sid_policy, 1, &tb, blob_data(msg), blob_len(msg));
750
751 if (!tb)
752 return UBUS_STATUS_INVALID_ARGUMENT;
753
754 if (!strcmp(blobmsg_get_string(tb), RPC_DEFAULT_SESSION_ID))
755 return UBUS_STATUS_PERMISSION_DENIED;
756
757 ses = rpc_session_get(blobmsg_data(tb));
758 if (!ses)
759 return UBUS_STATUS_NOT_FOUND;
760
761 rpc_session_destroy(ses);
762
763 return 0;
764 }
765
766
767 static bool
768 rpc_login_test_password(const char *hash, const char *password)
769 {
770 char *crypt_hash;
771
772 /* password is not set */
773 if (!hash || !*hash || !strcmp(hash, "!") || !strcmp(hash, "x"))
774 {
775 return true;
776 }
777
778 /* password hash refers to shadow/passwd */
779 else if (!strncmp(hash, "$p$", 3))
780 {
781 #ifdef HAVE_SHADOW
782 struct spwd *sp = getspnam(hash + 3);
783
784 if (!sp)
785 return false;
786
787 return rpc_login_test_password(sp->sp_pwdp, password);
788 #else
789 struct passwd *pw = getpwnam(hash + 3);
790
791 if (!pw)
792 return false;
793
794 return rpc_login_test_password(pw->pw_passwd, password);
795 #endif
796 }
797
798 crypt_hash = crypt(password, hash);
799
800 return !strcmp(crypt_hash, hash);
801 }
802
803 static struct uci_section *
804 rpc_login_test_login(struct uci_context *uci,
805 const char *username, const char *password)
806 {
807 struct uci_package *p = NULL;
808 struct uci_section *s;
809 struct uci_element *e;
810 struct uci_ptr ptr = { .package = "rpcd" };
811
812 uci_load(uci, ptr.package, &p);
813
814 if (!p)
815 return false;
816
817 uci_foreach_element(&p->sections, e)
818 {
819 s = uci_to_section(e);
820
821 if (strcmp(s->type, "login"))
822 continue;
823
824 ptr.section = s->e.name;
825 ptr.s = NULL;
826
827 /* test for matching username */
828 ptr.option = "username";
829 ptr.o = NULL;
830
831 if (uci_lookup_ptr(uci, &ptr, NULL, true))
832 continue;
833
834 if (ptr.o->type != UCI_TYPE_STRING)
835 continue;
836
837 if (strcmp(ptr.o->v.string, username))
838 continue;
839
840 /* test for matching password */
841 ptr.option = "password";
842 ptr.o = NULL;
843
844 if (uci_lookup_ptr(uci, &ptr, NULL, true))
845 continue;
846
847 if (ptr.o->type != UCI_TYPE_STRING)
848 continue;
849
850 if (rpc_login_test_password(ptr.o->v.string, password))
851 return ptr.s;
852 }
853
854 return NULL;
855 }
856
857 static bool
858 rpc_login_test_permission(struct uci_section *s,
859 const char *perm, const char *group)
860 {
861 struct uci_option *o;
862 struct uci_element *e, *l;
863
864 /* If the login section is not provided, we're setting up acls for the
865 * default session, in this case uncondionally allow access to the
866 * "unauthenticated" access group */
867 if (!s) {
868 return !strcmp(group, "unauthenticated");
869 }
870
871 uci_foreach_element(&s->options, e)
872 {
873 o = uci_to_option(e);
874
875 if (o->type != UCI_TYPE_LIST)
876 continue;
877
878 if (strcmp(o->e.name, perm))
879 continue;
880
881 uci_foreach_element(&o->v.list, l)
882 if (l->name && !fnmatch(l->name, group, 0))
883 return true;
884 }
885
886 /* make sure that write permission implies read permission */
887 if (!strcmp(perm, "read"))
888 return rpc_login_test_permission(s, "write", group);
889
890 return false;
891 }
892
893 static void
894 rpc_login_setup_acl_scope(struct rpc_session *ses,
895 struct blob_attr *acl_perm,
896 struct blob_attr *acl_scope)
897 {
898 struct blob_attr *acl_obj, *acl_func;
899 int rem, rem2;
900
901 /*
902 * Parse ACL scopes in table notation.
903 *
904 * "<scope>": {
905 * "<object>": [
906 * "<function>",
907 * "<function>",
908 * ...
909 * ]
910 * }
911 */
912 if (blob_id(acl_scope) == BLOBMSG_TYPE_TABLE) {
913 blobmsg_for_each_attr(acl_obj, acl_scope, rem) {
914 if (blob_id(acl_obj) != BLOBMSG_TYPE_ARRAY)
915 continue;
916
917 blobmsg_for_each_attr(acl_func, acl_obj, rem2) {
918 if (blob_id(acl_func) != BLOBMSG_TYPE_STRING)
919 continue;
920
921 rpc_session_grant(ses, NULL, blobmsg_name(acl_scope),
922 blobmsg_name(acl_obj),
923 blobmsg_data(acl_func));
924 }
925 }
926 }
927
928 /*
929 * Parse ACL scopes in array notation. The permission ("read" or "write")
930 * will be used as function name for each object.
931 *
932 * "<scope>": [
933 * "<object>",
934 * "<object>",
935 * ...
936 * ]
937 */
938 else if (blob_id(acl_scope) == BLOBMSG_TYPE_ARRAY) {
939 blobmsg_for_each_attr(acl_obj, acl_scope, rem) {
940 if (blob_id(acl_obj) != BLOBMSG_TYPE_STRING)
941 continue;
942
943 rpc_session_grant(ses, NULL, blobmsg_name(acl_scope),
944 blobmsg_data(acl_obj),
945 blobmsg_name(acl_perm));
946 }
947 }
948 }
949
950 static void
951 rpc_login_setup_acl_file(struct rpc_session *ses, struct uci_section *login,
952 const char *path)
953 {
954 struct blob_buf acl = { 0 };
955 struct blob_attr *acl_group, *acl_perm, *acl_scope;
956 int rem, rem2, rem3;
957
958 blob_buf_init(&acl, 0);
959
960 if (!blobmsg_add_json_from_file(&acl, path)) {
961 fprintf(stderr, "Failed to parse %s\n", path);
962 goto out;
963 }
964
965 /* Iterate access groups in toplevel object */
966 blob_for_each_attr(acl_group, acl.head, rem) {
967 /* Iterate permission objects in each access group object */
968 blobmsg_for_each_attr(acl_perm, acl_group, rem2) {
969 if (blob_id(acl_perm) != BLOBMSG_TYPE_TABLE)
970 continue;
971
972 /* Only "read" and "write" permissions are defined */
973 if (strcmp(blobmsg_name(acl_perm), "read") &&
974 strcmp(blobmsg_name(acl_perm), "write"))
975 continue;
976
977 /*
978 * Check if the current user context specifies the current
979 * "read" or "write" permission in the given access group.
980 */
981 if (!rpc_login_test_permission(login, blobmsg_name(acl_perm),
982 blobmsg_name(acl_group)))
983 continue;
984
985 /* Iterate scope objects within the permission object */
986 blobmsg_for_each_attr(acl_scope, acl_perm, rem3) {
987 /* Setup the scopes of the access group */
988 rpc_login_setup_acl_scope(ses, acl_perm, acl_scope);
989
990 /*
991 * Add the access group itself as object to the "access-group"
992 * meta scope and the the permission level ("read" or "write")
993 * as function, so
994 * "<group>": {
995 * "<permission>": {
996 * "<scope>": ...
997 * }
998 * }
999 * becomes
1000 * "access-group": {
1001 * "<group>": [
1002 * "<permission>"
1003 * ]
1004 * }
1005 *
1006 * This allows session clients to easily query the allowed
1007 * access groups without having to test access of each single
1008 * <scope>/<object>/<function> tuple defined in a group.
1009 */
1010 rpc_session_grant(ses, NULL, "access-group",
1011 blobmsg_name(acl_group),
1012 blobmsg_name(acl_perm));
1013 }
1014 }
1015 }
1016
1017 out:
1018 blob_buf_free(&acl);
1019 }
1020
1021 static void
1022 rpc_login_setup_acls(struct rpc_session *ses, struct uci_section *login)
1023 {
1024 int i;
1025 glob_t gl;
1026
1027 if (glob(RPC_SESSION_ACL_DIR "/*.json", 0, NULL, &gl))
1028 return;
1029
1030 for (i = 0; i < gl.gl_pathc; i++)
1031 rpc_login_setup_acl_file(ses, login, gl.gl_pathv[i]);
1032
1033 globfree(&gl);
1034 }
1035
1036 static int
1037 rpc_handle_login(struct ubus_context *ctx, struct ubus_object *obj,
1038 struct ubus_request_data *req, const char *method,
1039 struct blob_attr *msg)
1040 {
1041 struct uci_context *uci = NULL;
1042 struct uci_section *login;
1043 struct rpc_session *ses;
1044 struct blob_attr *tb[__RPC_L_MAX];
1045 int timeout = RPC_DEFAULT_SESSION_TIMEOUT;
1046 int rv = 0;
1047
1048 blobmsg_parse(login_policy, __RPC_L_MAX, tb, blob_data(msg), blob_len(msg));
1049
1050 if (!tb[RPC_L_USERNAME] || !tb[RPC_L_PASSWORD]) {
1051 rv = UBUS_STATUS_INVALID_ARGUMENT;
1052 goto out;
1053 }
1054
1055 uci = uci_alloc_context();
1056
1057 if (!uci) {
1058 rv = UBUS_STATUS_UNKNOWN_ERROR;
1059 goto out;
1060 }
1061
1062 login = rpc_login_test_login(uci, blobmsg_get_string(tb[RPC_L_USERNAME]),
1063 blobmsg_get_string(tb[RPC_L_PASSWORD]));
1064
1065 if (!login) {
1066 rv = UBUS_STATUS_PERMISSION_DENIED;
1067 goto out;
1068 }
1069
1070 if (tb[RPC_L_TIMEOUT])
1071 timeout = blobmsg_get_u32(tb[RPC_L_TIMEOUT]);
1072
1073 ses = rpc_session_create(timeout);
1074
1075 if (!ses) {
1076 rv = UBUS_STATUS_UNKNOWN_ERROR;
1077 goto out;
1078 }
1079
1080 rpc_login_setup_acls(ses, login);
1081
1082 rpc_session_set(ses, "user", tb[RPC_L_USERNAME]);
1083 rpc_session_dump(ses, ctx, req);
1084
1085 out:
1086 if (uci)
1087 uci_free_context(uci);
1088
1089 return rv;
1090 }
1091
1092
1093 static bool
1094 rpc_validate_sid(const char *id)
1095 {
1096 if (!id)
1097 return false;
1098
1099 if (strlen(id) != RPC_SID_LEN)
1100 return false;
1101
1102 while (*id)
1103 if (!isxdigit(*id++))
1104 return false;
1105
1106 return true;
1107 }
1108
1109 static int
1110 rpc_blob_to_file(const char *path, struct blob_attr *attr)
1111 {
1112 int fd, len;
1113
1114 fd = open(path, O_WRONLY | O_CREAT | O_EXCL, 0600);
1115
1116 if (fd < 0)
1117 return fd;
1118
1119 len = write(fd, attr, blob_pad_len(attr));
1120
1121 close(fd);
1122
1123 if (len != blob_pad_len(attr))
1124 {
1125 unlink(path);
1126 return -1;
1127 }
1128
1129 return len;
1130 }
1131
1132 static struct blob_attr *
1133 rpc_blob_from_file(const char *path)
1134 {
1135 int fd = -1, len;
1136 struct stat s;
1137 struct blob_attr head, *attr = NULL;
1138
1139 if (stat(path, &s) || !S_ISREG(s.st_mode))
1140 return NULL;
1141
1142 fd = open(path, O_RDONLY);
1143
1144 if (fd < 0)
1145 goto fail;
1146
1147 len = read(fd, &head, sizeof(head));
1148
1149 if (len != sizeof(head) || blob_pad_len(&head) != s.st_size)
1150 goto fail;
1151
1152 attr = calloc(1, s.st_size);
1153
1154 if (!attr)
1155 goto fail;
1156
1157 memcpy(attr, &head, sizeof(head));
1158
1159 len += read(fd, (char *)attr + sizeof(head), s.st_size - sizeof(head));
1160
1161 if (len != blob_pad_len(&head))
1162 goto fail;
1163
1164 return attr;
1165
1166 fail:
1167 if (fd >= 0)
1168 close(fd);
1169
1170 if (attr)
1171 free(attr);
1172
1173 return NULL;
1174 }
1175
1176 static bool
1177 rpc_session_from_blob(struct blob_attr *attr)
1178 {
1179 int i, rem, rem2, rem3;
1180 struct rpc_session *ses;
1181 struct blob_attr *tb[__RPC_DUMP_MAX], *scope, *object, *function;
1182
1183 blobmsg_parse(dump_policy, __RPC_DUMP_MAX, tb,
1184 blob_data(attr), blob_len(attr));
1185
1186 for (i = 0; i < __RPC_DUMP_MAX; i++)
1187 if (!tb[i])
1188 return false;
1189
1190 ses = rpc_session_new();
1191
1192 if (!ses)
1193 return false;
1194
1195 memcpy(ses->id, blobmsg_data(tb[RPC_DUMP_SID]), RPC_SID_LEN);
1196
1197 ses->timeout = blobmsg_get_u32(tb[RPC_DUMP_TIMEOUT]);
1198
1199 blobmsg_for_each_attr(scope, tb[RPC_DUMP_ACLS], rem) {
1200 blobmsg_for_each_attr(object, scope, rem2) {
1201 blobmsg_for_each_attr(function, object, rem3) {
1202 rpc_session_grant(ses, NULL, blobmsg_name(scope),
1203 blobmsg_name(object),
1204 blobmsg_data(function));
1205 }
1206 }
1207 }
1208
1209 blobmsg_for_each_attr(object, tb[RPC_DUMP_DATA], rem) {
1210 rpc_session_set(ses, blobmsg_name(object), object);
1211 }
1212
1213 avl_insert(&sessions, &ses->avl);
1214
1215 uloop_timeout_set(&ses->t, blobmsg_get_u32(tb[RPC_DUMP_EXPIRES]) * 1000);
1216
1217 return true;
1218 }
1219
1220 int rpc_session_api_init(struct ubus_context *ctx)
1221 {
1222 struct rpc_session *ses;
1223
1224 static const struct ubus_method session_methods[] = {
1225 UBUS_METHOD("create", rpc_handle_create, &new_policy),
1226 UBUS_METHOD("list", rpc_handle_list, &sid_policy),
1227 UBUS_METHOD("grant", rpc_handle_acl, acl_policy),
1228 UBUS_METHOD("revoke", rpc_handle_acl, acl_policy),
1229 UBUS_METHOD("access", rpc_handle_access, perm_policy),
1230 UBUS_METHOD("set", rpc_handle_set, set_policy),
1231 UBUS_METHOD("get", rpc_handle_get, get_policy),
1232 UBUS_METHOD("unset", rpc_handle_unset, get_policy),
1233 UBUS_METHOD("destroy", rpc_handle_destroy, &sid_policy),
1234 UBUS_METHOD("login", rpc_handle_login, login_policy),
1235 };
1236
1237 static struct ubus_object_type session_type =
1238 UBUS_OBJECT_TYPE("luci-rpc-session", session_methods);
1239
1240 static struct ubus_object obj = {
1241 .name = "session",
1242 .type = &session_type,
1243 .methods = session_methods,
1244 .n_methods = ARRAY_SIZE(session_methods),
1245 };
1246
1247 avl_init(&sessions, avl_strcmp, false, NULL);
1248
1249 /* setup the default session */
1250 ses = rpc_session_new();
1251
1252 if (ses) {
1253 strcpy(ses->id, RPC_DEFAULT_SESSION_ID);
1254 rpc_login_setup_acls(ses, NULL);
1255 avl_insert(&sessions, &ses->avl);
1256 }
1257
1258 return ubus_add_object(ctx, &obj);
1259 }
1260
1261 bool rpc_session_access(const char *sid, const char *scope,
1262 const char *object, const char *function)
1263 {
1264 struct rpc_session *ses = rpc_session_get(sid);
1265
1266 if (!ses)
1267 return false;
1268
1269 return rpc_session_acl_allowed(ses, scope, object, function);
1270 }
1271
1272 void rpc_session_create_cb(struct rpc_session_cb *cb)
1273 {
1274 if (cb && cb->cb)
1275 list_add(&cb->list, &create_callbacks);
1276 }
1277
1278 void rpc_session_destroy_cb(struct rpc_session_cb *cb)
1279 {
1280 if (cb && cb->cb)
1281 list_add(&cb->list, &destroy_callbacks);
1282 }
1283
1284 void rpc_session_freeze(void)
1285 {
1286 struct stat s;
1287 struct rpc_session *ses;
1288 char path[PATH_MAX];
1289
1290 if (stat(RPC_SESSION_DIRECTORY, &s))
1291 mkdir(RPC_SESSION_DIRECTORY, 0700);
1292
1293 avl_for_each_element(&sessions, ses, avl) {
1294 /* skip default session */
1295 if (!strcmp(ses->id, RPC_DEFAULT_SESSION_ID))
1296 continue;
1297
1298 snprintf(path, sizeof(path) - 1, RPC_SESSION_DIRECTORY "/%s", ses->id);
1299 rpc_session_to_blob(ses);
1300 rpc_blob_to_file(path, buf.head);
1301 }
1302 }
1303
1304 void rpc_session_thaw(void)
1305 {
1306 DIR *d;
1307 char path[PATH_MAX];
1308 struct dirent *e;
1309 struct blob_attr *attr;
1310
1311 d = opendir(RPC_SESSION_DIRECTORY);
1312
1313 if (!d)
1314 return;
1315
1316 while ((e = readdir(d)) != NULL) {
1317 if (!rpc_validate_sid(e->d_name))
1318 continue;
1319
1320 snprintf(path, sizeof(path) - 1,
1321 RPC_SESSION_DIRECTORY "/%s", e->d_name);
1322
1323 attr = rpc_blob_from_file(path);
1324
1325 if (attr) {
1326 rpc_session_from_blob(attr);
1327 free(attr);
1328 }
1329
1330 unlink(path);
1331 }
1332
1333 closedir(d);
1334 }
OpenWrt ubus RPC daemon