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session: use correct policy for rpc_handle_login()
[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 ses = rpc_session_get(blobmsg_data(tb));
755 if (!ses)
756 return UBUS_STATUS_NOT_FOUND;
757
758 rpc_session_destroy(ses);
759
760 return 0;
761 }
762
763
764 static bool
765 rpc_login_test_password(const char *hash, const char *password)
766 {
767 char *crypt_hash;
768
769 /* password is not set */
770 if (!hash || !*hash || !strcmp(hash, "!") || !strcmp(hash, "x"))
771 {
772 return true;
773 }
774
775 /* password hash refers to shadow/passwd */
776 else if (!strncmp(hash, "$p$", 3))
777 {
778 #ifdef HAVE_SHADOW
779 struct spwd *sp = getspnam(hash + 3);
780
781 if (!sp)
782 return false;
783
784 return rpc_login_test_password(sp->sp_pwdp, password);
785 #else
786 struct passwd *pw = getpwnam(hash + 3);
787
788 if (!pw)
789 return false;
790
791 return rpc_login_test_password(pw->pw_passwd, password);
792 #endif
793 }
794
795 crypt_hash = crypt(hash, password);
796
797 return !strcmp(crypt_hash, hash);
798 }
799
800 static struct uci_section *
801 rpc_login_test_login(struct uci_context *uci,
802 const char *username, const char *password)
803 {
804 struct uci_package *p;
805 struct uci_section *s;
806 struct uci_element *e;
807 struct uci_ptr ptr = { .package = "rpcd" };
808
809 uci_load(uci, ptr.package, &p);
810
811 if (!p)
812 return false;
813
814 uci_foreach_element(&p->sections, e)
815 {
816 s = uci_to_section(e);
817
818 if (strcmp(s->type, "login"))
819 continue;
820
821 ptr.section = s->e.name;
822 ptr.s = NULL;
823
824 /* test for matching username */
825 ptr.option = "username";
826 ptr.o = NULL;
827
828 if (uci_lookup_ptr(uci, &ptr, NULL, true))
829 continue;
830
831 if (ptr.o->type != UCI_TYPE_STRING)
832 continue;
833
834 if (strcmp(ptr.o->v.string, username))
835 continue;
836
837 /* test for matching password */
838 ptr.option = "password";
839 ptr.o = NULL;
840
841 if (uci_lookup_ptr(uci, &ptr, NULL, true))
842 continue;
843
844 if (ptr.o->type != UCI_TYPE_STRING)
845 continue;
846
847 if (rpc_login_test_password(ptr.o->v.string, password))
848 return ptr.s;
849 }
850
851 return NULL;
852 }
853
854 static bool
855 rpc_login_test_permission(struct uci_section *s,
856 const char *perm, const char *group)
857 {
858 struct uci_option *o;
859 struct uci_element *e, *l;
860
861 /* If the login section is not provided, we're setting up acls for the
862 * default session, in this case uncondionally allow access to the
863 * "unauthenticated" access group */
864 if (!s) {
865 return !strcmp(group, "unauthenticated");
866 }
867
868 uci_foreach_element(&s->options, e)
869 {
870 o = uci_to_option(e);
871
872 if (o->type != UCI_TYPE_LIST)
873 continue;
874
875 if (strcmp(o->e.name, perm))
876 continue;
877
878 uci_foreach_element(&o->v.list, l)
879 if (l->name && !fnmatch(l->name, group, 0))
880 return true;
881 }
882
883 /* make sure that write permission implies read permission */
884 if (!strcmp(perm, "read"))
885 return rpc_login_test_permission(s, "write", group);
886
887 return false;
888 }
889
890 static void
891 rpc_login_setup_acl_scope(struct rpc_session *ses,
892 struct blob_attr *acl_perm,
893 struct blob_attr *acl_scope)
894 {
895 struct blob_attr *acl_obj, *acl_func;
896 int rem, rem2;
897
898 /*
899 * Parse ACL scopes in table notation.
900 *
901 * "<scope>": {
902 * "<object>": [
903 * "<function>",
904 * "<function>",
905 * ...
906 * ]
907 * }
908 */
909 if (blob_id(acl_scope) == BLOBMSG_TYPE_TABLE) {
910 blobmsg_for_each_attr(acl_obj, acl_scope, rem) {
911 if (blob_id(acl_obj) != BLOBMSG_TYPE_ARRAY)
912 continue;
913
914 blobmsg_for_each_attr(acl_func, acl_obj, rem2) {
915 if (blob_id(acl_func) != BLOBMSG_TYPE_STRING)
916 continue;
917
918 rpc_session_grant(ses, NULL, blobmsg_name(acl_scope),
919 blobmsg_name(acl_obj),
920 blobmsg_data(acl_func));
921 }
922 }
923 }
924
925 /*
926 * Parse ACL scopes in array notation. The permission ("read" or "write")
927 * will be used as function name for each object.
928 *
929 * "<scope>": [
930 * "<object>",
931 * "<object>",
932 * ...
933 * ]
934 */
935 else if (blob_id(acl_scope) == BLOBMSG_TYPE_ARRAY) {
936 blobmsg_for_each_attr(acl_obj, acl_scope, rem) {
937 if (blob_id(acl_obj) != BLOBMSG_TYPE_STRING)
938 continue;
939
940 rpc_session_grant(ses, NULL, blobmsg_name(acl_scope),
941 blobmsg_data(acl_obj),
942 blobmsg_name(acl_perm));
943 }
944 }
945 }
946
947 static void
948 rpc_login_setup_acl_file(struct rpc_session *ses, struct uci_section *login,
949 const char *path)
950 {
951 struct blob_buf acl = { 0 };
952 struct blob_attr *acl_group, *acl_perm, *acl_scope;
953 int rem, rem2, rem3;
954
955 blob_buf_init(&acl, 0);
956
957 if (!blobmsg_add_json_from_file(&acl, path)) {
958 fprintf(stderr, "Failed to parse %s\n", path);
959 goto out;
960 }
961
962 /* Iterate access groups in toplevel object */
963 blob_for_each_attr(acl_group, acl.head, rem) {
964 /* Iterate permission objects in each access group object */
965 blobmsg_for_each_attr(acl_perm, acl_group, rem2) {
966 if (blob_id(acl_perm) != BLOBMSG_TYPE_TABLE)
967 continue;
968
969 /* Only "read" and "write" permissions are defined */
970 if (strcmp(blobmsg_name(acl_perm), "read") &&
971 strcmp(blobmsg_name(acl_perm), "write"))
972 continue;
973
974 /*
975 * Check if the current user context specifies the current
976 * "read" or "write" permission in the given access group.
977 */
978 if (!rpc_login_test_permission(login, blobmsg_name(acl_perm),
979 blobmsg_name(acl_group)))
980 continue;
981
982 /* Iterate scope objects within the permission object */
983 blobmsg_for_each_attr(acl_scope, acl_perm, rem3) {
984 /* Setup the scopes of the access group */
985 rpc_login_setup_acl_scope(ses, acl_perm, acl_scope);
986
987 /*
988 * Add the access group itself as object to the "access-group"
989 * meta scope and the the permission level ("read" or "write")
990 * as function, so
991 * "<group>": {
992 * "<permission>": {
993 * "<scope>": ...
994 * }
995 * }
996 * becomes
997 * "access-group": {
998 * "<group>": [
999 * "<permission>"
1000 * ]
1001 * }
1002 *
1003 * This allows session clients to easily query the allowed
1004 * access groups without having to test access of each single
1005 * <scope>/<object>/<function> tuple defined in a group.
1006 */
1007 rpc_session_grant(ses, NULL, "access-group",
1008 blobmsg_name(acl_group),
1009 blobmsg_name(acl_perm));
1010 }
1011 }
1012 }
1013
1014 out:
1015 blob_buf_free(&acl);
1016 }
1017
1018 static void
1019 rpc_login_setup_acls(struct rpc_session *ses, struct uci_section *login)
1020 {
1021 int i;
1022 glob_t gl;
1023
1024 if (glob(RPC_SESSION_ACL_DIR "/*.json", 0, NULL, &gl))
1025 return;
1026
1027 for (i = 0; i < gl.gl_pathc; i++)
1028 rpc_login_setup_acl_file(ses, login, gl.gl_pathv[i]);
1029
1030 globfree(&gl);
1031 }
1032
1033 static int
1034 rpc_handle_login(struct ubus_context *ctx, struct ubus_object *obj,
1035 struct ubus_request_data *req, const char *method,
1036 struct blob_attr *msg)
1037 {
1038 struct uci_context *uci = NULL;
1039 struct uci_section *login;
1040 struct rpc_session *ses;
1041 struct blob_attr *tb[__RPC_L_MAX];
1042 int timeout = RPC_DEFAULT_SESSION_TIMEOUT;
1043 int rv = 0;
1044
1045 blobmsg_parse(login_policy, __RPC_L_MAX, tb, blob_data(msg), blob_len(msg));
1046
1047 if (!tb[RPC_L_USERNAME] || !tb[RPC_L_PASSWORD]) {
1048 rv = UBUS_STATUS_INVALID_ARGUMENT;
1049 goto out;
1050 }
1051
1052 uci = uci_alloc_context();
1053
1054 if (!uci) {
1055 rv = UBUS_STATUS_UNKNOWN_ERROR;
1056 goto out;
1057 }
1058
1059 login = rpc_login_test_login(uci, blobmsg_get_string(tb[RPC_L_USERNAME]),
1060 blobmsg_get_string(tb[RPC_L_PASSWORD]));
1061
1062 if (!login) {
1063 rv = UBUS_STATUS_PERMISSION_DENIED;
1064 goto out;
1065 }
1066
1067 if (tb[RPC_L_TIMEOUT])
1068 timeout = blobmsg_get_u32(tb[RPC_L_TIMEOUT]);
1069
1070 ses = rpc_session_create(timeout);
1071
1072 if (!ses) {
1073 rv = UBUS_STATUS_UNKNOWN_ERROR;
1074 goto out;
1075 }
1076
1077 rpc_login_setup_acls(ses, login);
1078
1079 rpc_session_set(ses, "user", tb[RPC_L_USERNAME]);
1080 rpc_session_dump(ses, ctx, req);
1081
1082 out:
1083 if (uci)
1084 uci_free_context(uci);
1085
1086 return rv;
1087 }
1088
1089
1090 static bool
1091 rpc_validate_sid(const char *id)
1092 {
1093 if (!id)
1094 return false;
1095
1096 if (strlen(id) != RPC_SID_LEN)
1097 return false;
1098
1099 while (*id)
1100 if (!isxdigit(*id++))
1101 return false;
1102
1103 return true;
1104 }
1105
1106 static int
1107 rpc_blob_to_file(const char *path, struct blob_attr *attr)
1108 {
1109 int fd, len;
1110
1111 fd = open(path, O_WRONLY | O_CREAT | O_EXCL, 0600);
1112
1113 if (fd < 0)
1114 return fd;
1115
1116 len = write(fd, attr, blob_pad_len(attr));
1117
1118 close(fd);
1119
1120 if (len != blob_pad_len(attr))
1121 {
1122 unlink(path);
1123 return -1;
1124 }
1125
1126 return len;
1127 }
1128
1129 static struct blob_attr *
1130 rpc_blob_from_file(const char *path)
1131 {
1132 int fd = -1, len;
1133 struct stat s;
1134 struct blob_attr head, *attr = NULL;
1135
1136 if (stat(path, &s) || !S_ISREG(s.st_mode))
1137 return NULL;
1138
1139 fd = open(path, O_RDONLY);
1140
1141 if (fd < 0)
1142 goto fail;
1143
1144 len = read(fd, &head, sizeof(head));
1145
1146 if (len != sizeof(head) || blob_pad_len(&head) != s.st_size)
1147 goto fail;
1148
1149 attr = calloc(1, s.st_size);
1150
1151 if (!attr)
1152 goto fail;
1153
1154 memcpy(attr, &head, sizeof(head));
1155
1156 len += read(fd, (char *)attr + sizeof(head), s.st_size - sizeof(head));
1157
1158 if (len != blob_pad_len(&head))
1159 goto fail;
1160
1161 return attr;
1162
1163 fail:
1164 if (fd >= 0)
1165 close(fd);
1166
1167 if (attr)
1168 free(attr);
1169
1170 return NULL;
1171 }
1172
1173 static bool
1174 rpc_session_from_blob(struct blob_attr *attr)
1175 {
1176 int i, rem, rem2, rem3;
1177 struct rpc_session *ses;
1178 struct blob_attr *tb[__RPC_DUMP_MAX], *scope, *object, *function;
1179
1180 blobmsg_parse(dump_policy, __RPC_DUMP_MAX, tb,
1181 blob_data(attr), blob_len(attr));
1182
1183 for (i = 0; i < __RPC_DUMP_MAX; i++)
1184 if (!tb[i])
1185 return false;
1186
1187 ses = rpc_session_new();
1188
1189 if (!ses)
1190 return false;
1191
1192 memcpy(ses->id, blobmsg_data(tb[RPC_DUMP_SID]), RPC_SID_LEN);
1193
1194 ses->timeout = blobmsg_get_u32(tb[RPC_DUMP_TIMEOUT]);
1195
1196 blobmsg_for_each_attr(scope, tb[RPC_DUMP_ACLS], rem) {
1197 blobmsg_for_each_attr(object, scope, rem2) {
1198 blobmsg_for_each_attr(function, object, rem3) {
1199 rpc_session_grant(ses, NULL, blobmsg_name(scope),
1200 blobmsg_name(object),
1201 blobmsg_data(function));
1202 }
1203 }
1204 }
1205
1206 blobmsg_for_each_attr(object, tb[RPC_DUMP_DATA], rem) {
1207 rpc_session_set(ses, blobmsg_name(object), object);
1208 }
1209
1210 avl_insert(&sessions, &ses->avl);
1211
1212 uloop_timeout_set(&ses->t, blobmsg_get_u32(tb[RPC_DUMP_EXPIRES]) * 1000);
1213
1214 return true;
1215 }
1216
1217 int rpc_session_api_init(struct ubus_context *ctx)
1218 {
1219 struct rpc_session *ses;
1220
1221 static const struct ubus_method session_methods[] = {
1222 UBUS_METHOD("create", rpc_handle_create, &new_policy),
1223 UBUS_METHOD("list", rpc_handle_list, &sid_policy),
1224 UBUS_METHOD("grant", rpc_handle_acl, acl_policy),
1225 UBUS_METHOD("revoke", rpc_handle_acl, acl_policy),
1226 UBUS_METHOD("access", rpc_handle_access, perm_policy),
1227 UBUS_METHOD("set", rpc_handle_set, set_policy),
1228 UBUS_METHOD("get", rpc_handle_get, get_policy),
1229 UBUS_METHOD("unset", rpc_handle_unset, get_policy),
1230 UBUS_METHOD("destroy", rpc_handle_destroy, &sid_policy),
1231 UBUS_METHOD("login", rpc_handle_login, login_policy),
1232 };
1233
1234 static struct ubus_object_type session_type =
1235 UBUS_OBJECT_TYPE("luci-rpc-session", session_methods);
1236
1237 static struct ubus_object obj = {
1238 .name = "session",
1239 .type = &session_type,
1240 .methods = session_methods,
1241 .n_methods = ARRAY_SIZE(session_methods),
1242 };
1243
1244 avl_init(&sessions, avl_strcmp, false, NULL);
1245
1246 /* setup the default session */
1247 ses = rpc_session_new();
1248
1249 if (ses) {
1250 strcpy(ses->id, RPC_DEFAULT_SESSION_ID);
1251 rpc_login_setup_acls(ses, NULL);
1252 avl_insert(&sessions, &ses->avl);
1253 }
1254
1255 return ubus_add_object(ctx, &obj);
1256 }
1257
1258 bool rpc_session_access(const char *sid, const char *scope,
1259 const char *object, const char *function)
1260 {
1261 struct rpc_session *ses = rpc_session_get(sid);
1262
1263 if (!ses)
1264 return false;
1265
1266 return rpc_session_acl_allowed(ses, scope, object, function);
1267 }
1268
1269 void rpc_session_create_cb(struct rpc_session_cb *cb)
1270 {
1271 if (cb && cb->cb)
1272 list_add(&cb->list, &create_callbacks);
1273 }
1274
1275 void rpc_session_destroy_cb(struct rpc_session_cb *cb)
1276 {
1277 if (cb && cb->cb)
1278 list_add(&cb->list, &destroy_callbacks);
1279 }
1280
1281 void rpc_session_freeze(void)
1282 {
1283 struct stat s;
1284 struct rpc_session *ses;
1285 char path[PATH_MAX];
1286
1287 if (stat(RPC_SESSION_DIRECTORY, &s))
1288 mkdir(RPC_SESSION_DIRECTORY, 0700);
1289
1290 avl_for_each_element(&sessions, ses, avl) {
1291 /* skip default session */
1292 if (!strcmp(ses->id, RPC_DEFAULT_SESSION_ID))
1293 continue;
1294
1295 snprintf(path, sizeof(path) - 1, RPC_SESSION_DIRECTORY "/%s", ses->id);
1296 rpc_session_to_blob(ses);
1297 rpc_blob_to_file(path, buf.head);
1298 }
1299 }
1300
1301 void rpc_session_thaw(void)
1302 {
1303 DIR *d;
1304 char path[PATH_MAX];
1305 struct dirent *e;
1306 struct blob_attr *attr;
1307
1308 d = opendir(RPC_SESSION_DIRECTORY);
1309
1310 if (!d)
1311 return;
1312
1313 while ((e = readdir(d)) != NULL) {
1314 if (!rpc_validate_sid(e->d_name))
1315 continue;
1316
1317 snprintf(path, sizeof(path) - 1,
1318 RPC_SESSION_DIRECTORY "/%s", e->d_name);
1319
1320 attr = rpc_blob_from_file(path);
1321
1322 if (attr) {
1323 rpc_session_from_blob(attr);
1324 free(attr);
1325 }
1326
1327 unlink(path);
1328 }
1329
1330 closedir(d);
1331 }
OpenWrt ubus RPC daemon