projects / project / uhttpd.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
history | raw | HEAD
make arguments of not compiled functionality non-fatal
[project/uhttpd.git] / ubus-session.c
1 /*
2 * uhttpd - Tiny single-threaded httpd
3 *
4 * Copyright (C) 2010-2013 Jo-Philipp Wich <xm@subsignal.org>
5 * Copyright (C) 2013 Felix Fietkau <nbd@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 #include <libubox/avl-cmp.h>
21 #include <libubox/utils.h>
22 #include <libubus.h>
23 #include <fnmatch.h>
24
25 #include "ubus-session.h"
26
27 static struct avl_tree sessions;
28 static struct blob_buf buf;
29
30 static const struct blobmsg_policy new_policy = {
31 .name = "timeout", .type = BLOBMSG_TYPE_INT32
32 };
33
34 static const struct blobmsg_policy sid_policy = {
35 .name = "sid", .type = BLOBMSG_TYPE_STRING
36 };
37
38 enum {
39 UH_UBUS_SS_SID,
40 UH_UBUS_SS_VALUES,
41 __UH_UBUS_SS_MAX,
42 };
43 static const struct blobmsg_policy set_policy[__UH_UBUS_SS_MAX] = {
44 [UH_UBUS_SS_SID] = { .name = "sid", .type = BLOBMSG_TYPE_STRING },
45 [UH_UBUS_SS_VALUES] = { .name = "values", .type = BLOBMSG_TYPE_TABLE },
46 };
47
48 enum {
49 UH_UBUS_SG_SID,
50 UH_UBUS_SG_KEYS,
51 __UH_UBUS_SG_MAX,
52 };
53 static const struct blobmsg_policy get_policy[__UH_UBUS_SG_MAX] = {
54 [UH_UBUS_SG_SID] = { .name = "sid", .type = BLOBMSG_TYPE_STRING },
55 [UH_UBUS_SG_KEYS] = { .name = "keys", .type = BLOBMSG_TYPE_ARRAY },
56 };
57
58 enum {
59 UH_UBUS_SA_SID,
60 UH_UBUS_SA_OBJECTS,
61 __UH_UBUS_SA_MAX,
62 };
63 static const struct blobmsg_policy acl_policy[__UH_UBUS_SA_MAX] = {
64 [UH_UBUS_SA_SID] = { .name = "sid", .type = BLOBMSG_TYPE_STRING },
65 [UH_UBUS_SA_OBJECTS] = { .name = "objects", .type = BLOBMSG_TYPE_ARRAY },
66 };
67
68 /*
69 * Keys in the AVL tree contain all pattern characters up to the first wildcard.
70 * To look up entries, start with the last entry that has a key less than or
71 * equal to the method name, then work backwards as long as the AVL key still
72 * matches its counterpart in the object name
73 */
74 #define uh_foreach_matching_acl_prefix(_acl, _ses, _obj, _func) \
75 for (_acl = avl_find_le_element(&(_ses)->acls, _obj, _acl, avl); \
76 _acl; \
77 _acl = avl_is_first(&(ses)->acls, &(_acl)->avl) ? NULL : \
78 avl_prev_element((_acl), avl))
79
80 #define uh_foreach_matching_acl(_acl, _ses, _obj, _func) \
81 uh_foreach_matching_acl_prefix(_acl, _ses, _obj, _func) \
82 if (!strncmp((_acl)->object, _obj, (_acl)->sort_len) && \
83 !fnmatch((_acl)->object, (_obj), FNM_NOESCAPE) && \
84 !fnmatch((_acl)->function, (_func), FNM_NOESCAPE))
85
86 static void
87 uh_ubus_random(char *dest)
88 {
89 unsigned char buf[16] = { 0 };
90 FILE *f;
91 int i;
92
93 f = fopen("/dev/urandom", "r");
94 if (!f)
95 return;
96
97 fread(buf, 1, sizeof(buf), f);
98 fclose(f);
99
100 for (i = 0; i < sizeof(buf); i++)
101 sprintf(dest + (i<<1), "%02x", buf[i]);
102 }
103
104 static void
105 uh_ubus_session_dump_data(struct uh_ubus_session *ses, struct blob_buf *b)
106 {
107 struct uh_ubus_session_data *d;
108
109 avl_for_each_element(&ses->data, d, avl) {
110 blobmsg_add_field(b, blobmsg_type(d->attr), blobmsg_name(d->attr),
111 blobmsg_data(d->attr), blobmsg_data_len(d->attr));
112 }
113 }
114
115 static void
116 uh_ubus_session_dump_acls(struct uh_ubus_session *ses, struct blob_buf *b)
117 {
118 struct uh_ubus_session_acl *acl;
119 const char *lastobj = NULL;
120 void *c = NULL;
121
122 avl_for_each_element(&ses->acls, acl, avl) {
123 if (!lastobj || strcmp(acl->object, lastobj))
124 {
125 if (c) blobmsg_close_array(b, c);
126 c = blobmsg_open_array(b, acl->object);
127 }
128
129 blobmsg_add_string(b, NULL, acl->function);
130 lastobj = acl->object;
131 }
132
133 if (c) blobmsg_close_array(b, c);
134 }
135
136 static void
137 uh_ubus_session_dump(struct uh_ubus_session *ses,
138 struct ubus_context *ctx,
139 struct ubus_request_data *req)
140 {
141 void *c;
142
143 blob_buf_init(&buf, 0);
144
145 blobmsg_add_string(&buf, "sid", ses->id);
146 blobmsg_add_u32(&buf, "timeout", ses->timeout);
147 blobmsg_add_u32(&buf, "expires", uloop_timeout_pending(&ses->t) / 1000);
148
149 c = blobmsg_open_table(&buf, "acls");
150 uh_ubus_session_dump_acls(ses, &buf);
151 blobmsg_close_table(&buf, c);
152
153 c = blobmsg_open_table(&buf, "data");
154 uh_ubus_session_dump_data(ses, &buf);
155 blobmsg_close_table(&buf, c);
156
157 ubus_send_reply(ctx, req, buf.head);
158 }
159
160 static void
161 uh_ubus_touch_session(struct uh_ubus_session *ses)
162 {
163 uloop_timeout_set(&ses->t, ses->timeout * 1000);
164 }
165
166 static void
167 uh_ubus_session_destroy(struct uh_ubus_session *ses)
168 {
169 struct uh_ubus_session_acl *acl, *nacl;
170 struct uh_ubus_session_data *data, *ndata;
171
172 uloop_timeout_cancel(&ses->t);
173 avl_remove_all_elements(&ses->acls, acl, avl, nacl)
174 free(acl);
175
176 avl_remove_all_elements(&ses->data, data, avl, ndata)
177 free(data);
178
179 avl_delete(&sessions, &ses->avl);
180 free(ses);
181 }
182
183 static void uh_ubus_session_timeout(struct uloop_timeout *t)
184 {
185 struct uh_ubus_session *ses;
186
187 ses = container_of(t, struct uh_ubus_session, t);
188 uh_ubus_session_destroy(ses);
189 }
190
191 static struct uh_ubus_session *
192 uh_ubus_session_create(int timeout)
193 {
194 struct uh_ubus_session *ses;
195
196 ses = calloc(1, sizeof(*ses));
197 if (!ses)
198 return NULL;
199
200 ses->timeout = timeout;
201 ses->avl.key = ses->id;
202 uh_ubus_random(ses->id);
203
204 avl_insert(&sessions, &ses->avl);
205 avl_init(&ses->acls, avl_strcmp, true, NULL);
206 avl_init(&ses->data, avl_strcmp, false, NULL);
207
208 ses->t.cb = uh_ubus_session_timeout;
209 uh_ubus_touch_session(ses);
210
211 return ses;
212 }
213
214 struct uh_ubus_session *
215 uh_ubus_session_get(const char *id)
216 {
217 struct uh_ubus_session *ses;
218
219 ses = avl_find_element(&sessions, id, ses, avl);
220 if (!ses)
221 return NULL;
222
223 uh_ubus_touch_session(ses);
224 return ses;
225 }
226
227 static int
228 uh_ubus_handle_create(struct ubus_context *ctx, struct ubus_object *obj,
229 struct ubus_request_data *req, const char *method,
230 struct blob_attr *msg)
231 {
232 struct uh_ubus_session *ses;
233 struct blob_attr *tb;
234 int timeout = UBUS_DEFAULT_SESSION_TIMEOUT;
235
236 blobmsg_parse(&new_policy, 1, &tb, blob_data(msg), blob_len(msg));
237 if (tb)
238 timeout = blobmsg_get_u32(tb);
239
240 ses = uh_ubus_session_create(timeout);
241 if (ses)
242 uh_ubus_session_dump(ses, ctx, req);
243
244 return 0;
245 }
246
247 static int
248 uh_ubus_handle_list(struct ubus_context *ctx, struct ubus_object *obj,
249 struct ubus_request_data *req, const char *method,
250 struct blob_attr *msg)
251 {
252 struct uh_ubus_session *ses;
253 struct blob_attr *tb;
254
255 blobmsg_parse(&sid_policy, 1, &tb, blob_data(msg), blob_len(msg));
256
257 if (!tb) {
258 avl_for_each_element(&sessions, ses, avl)
259 uh_ubus_session_dump(ses, ctx, req);
260 return 0;
261 }
262
263 ses = uh_ubus_session_get(blobmsg_data(tb));
264 if (!ses)
265 return UBUS_STATUS_NOT_FOUND;
266
267 uh_ubus_session_dump(ses, ctx, req);
268
269 return 0;
270 }
271
272 static int
273 uh_id_len(const char *str)
274 {
275 return strcspn(str, "*?[");
276 }
277
278 static int
279 uh_ubus_session_grant(struct uh_ubus_session *ses, struct ubus_context *ctx,
280 const char *object, const char *function)
281 {
282 struct uh_ubus_session_acl *acl;
283 char *new_obj, *new_func, *new_id;
284 int id_len;
285
286 if (!object || !function)
287 return UBUS_STATUS_INVALID_ARGUMENT;
288
289 uh_foreach_matching_acl_prefix(acl, ses, object, function) {
290 if (!strcmp(acl->object, object) &&
291 !strcmp(acl->function, function))
292 return 0;
293 }
294
295 id_len = uh_id_len(object);
296 acl = calloc_a(sizeof(*acl),
297 &new_obj, strlen(object) + 1,
298 &new_func, strlen(function) + 1,
299 &new_id, id_len + 1);
300
301 if (!acl)
302 return UBUS_STATUS_UNKNOWN_ERROR;
303
304 acl->object = strcpy(new_obj, object);
305 acl->function = strcpy(new_func, function);
306 acl->avl.key = strncpy(new_id, object, id_len);
307 avl_insert(&ses->acls, &acl->avl);
308
309 return 0;
310 }
311
312 static int
313 uh_ubus_session_revoke(struct uh_ubus_session *ses, struct ubus_context *ctx,
314 const char *object, const char *function)
315 {
316 struct uh_ubus_session_acl *acl, *next;
317 int id_len;
318 char *id;
319
320 if (!object && !function) {
321 avl_remove_all_elements(&ses->acls, acl, avl, next)
322 free(acl);
323 return 0;
324 }
325
326 id_len = uh_id_len(object);
327 id = alloca(id_len + 1);
328 strncpy(id, object, id_len);
329 id[id_len] = 0;
330
331 acl = avl_find_element(&ses->acls, id, acl, avl);
332 while (acl) {
333 if (!avl_is_last(&ses->acls, &acl->avl))
334 next = avl_next_element(acl, avl);
335 else
336 next = NULL;
337
338 if (strcmp(id, acl->avl.key) != 0)
339 break;
340
341 if (!strcmp(acl->object, object) &&
342 !strcmp(acl->function, function)) {
343 avl_delete(&ses->acls, &acl->avl);
344 free(acl);
345 }
346 acl = next;
347 }
348
349 return 0;
350 }
351
352
353 static int
354 uh_ubus_handle_acl(struct ubus_context *ctx, struct ubus_object *obj,
355 struct ubus_request_data *req, const char *method,
356 struct blob_attr *msg)
357 {
358 struct uh_ubus_session *ses;
359 struct blob_attr *tb[__UH_UBUS_SA_MAX];
360 struct blob_attr *attr, *sattr;
361 const char *object, *function;
362 int rem1, rem2;
363
364 int (*cb)(struct uh_ubus_session *ses, struct ubus_context *ctx,
365 const char *object, const char *function);
366
367 blobmsg_parse(acl_policy, __UH_UBUS_SA_MAX, tb, blob_data(msg), blob_len(msg));
368
369 if (!tb[UH_UBUS_SA_SID])
370 return UBUS_STATUS_INVALID_ARGUMENT;
371
372 ses = uh_ubus_session_get(blobmsg_data(tb[UH_UBUS_SA_SID]));
373 if (!ses)
374 return UBUS_STATUS_NOT_FOUND;
375
376 if (!strcmp(method, "grant"))
377 cb = uh_ubus_session_grant;
378 else
379 cb = uh_ubus_session_revoke;
380
381 if (!tb[UH_UBUS_SA_OBJECTS])
382 return cb(ses, ctx, NULL, NULL);
383
384 blobmsg_for_each_attr(attr, tb[UH_UBUS_SA_OBJECTS], rem1) {
385 if (blob_id(attr) != BLOBMSG_TYPE_ARRAY)
386 continue;
387
388 object = NULL;
389 function = NULL;
390
391 blobmsg_for_each_attr(sattr, attr, rem2) {
392 if (blob_id(sattr) != BLOBMSG_TYPE_STRING)
393 continue;
394
395 if (!object)
396 object = blobmsg_data(sattr);
397 else if (!function)
398 function = blobmsg_data(sattr);
399 else
400 break;
401 }
402
403 if (object && function)
404 cb(ses, ctx, object, function);
405 }
406
407 return 0;
408 }
409
410 static int
411 uh_ubus_handle_set(struct ubus_context *ctx, struct ubus_object *obj,
412 struct ubus_request_data *req, const char *method,
413 struct blob_attr *msg)
414 {
415 struct uh_ubus_session *ses;
416 struct uh_ubus_session_data *data;
417 struct blob_attr *tb[__UH_UBUS_SA_MAX];
418 struct blob_attr *attr;
419 int rem;
420
421 blobmsg_parse(set_policy, __UH_UBUS_SS_MAX, tb, blob_data(msg), blob_len(msg));
422
423 if (!tb[UH_UBUS_SS_SID] || !tb[UH_UBUS_SS_VALUES])
424 return UBUS_STATUS_INVALID_ARGUMENT;
425
426 ses = uh_ubus_session_get(blobmsg_data(tb[UH_UBUS_SS_SID]));
427 if (!ses)
428 return UBUS_STATUS_NOT_FOUND;
429
430 blobmsg_for_each_attr(attr, tb[UH_UBUS_SS_VALUES], rem) {
431 if (!blobmsg_name(attr)[0])
432 continue;
433
434 data = avl_find_element(&ses->data, blobmsg_name(attr), data, avl);
435 if (data) {
436 avl_delete(&ses->data, &data->avl);
437 free(data);
438 }
439
440 data = calloc(1, sizeof(*data) + blob_pad_len(attr));
441 if (!data)
442 break;
443
444 memcpy(data->attr, attr, blob_pad_len(attr));
445 data->avl.key = blobmsg_name(data->attr);
446 avl_insert(&ses->data, &data->avl);
447 }
448
449 return 0;
450 }
451
452 static int
453 uh_ubus_handle_get(struct ubus_context *ctx, struct ubus_object *obj,
454 struct ubus_request_data *req, const char *method,
455 struct blob_attr *msg)
456 {
457 struct uh_ubus_session *ses;
458 struct uh_ubus_session_data *data;
459 struct blob_attr *tb[__UH_UBUS_SA_MAX];
460 struct blob_attr *attr;
461 void *c;
462 int rem;
463
464 blobmsg_parse(get_policy, __UH_UBUS_SG_MAX, tb, blob_data(msg), blob_len(msg));
465
466 if (!tb[UH_UBUS_SG_SID])
467 return UBUS_STATUS_INVALID_ARGUMENT;
468
469 ses = uh_ubus_session_get(blobmsg_data(tb[UH_UBUS_SG_SID]));
470 if (!ses)
471 return UBUS_STATUS_NOT_FOUND;
472
473 blob_buf_init(&buf, 0);
474 c = blobmsg_open_table(&buf, "values");
475
476 if (!tb[UH_UBUS_SG_KEYS]) {
477 uh_ubus_session_dump_data(ses, &buf);
478 return 0;
479 }
480
481 blobmsg_for_each_attr(attr, tb[UH_UBUS_SG_KEYS], rem) {
482 if (blob_id(attr) != BLOBMSG_TYPE_STRING)
483 continue;
484
485 data = avl_find_element(&ses->data, blobmsg_data(attr), data, avl);
486 if (!data)
487 continue;
488
489 blobmsg_add_field(&buf, blobmsg_type(data->attr),
490 blobmsg_name(data->attr),
491 blobmsg_data(data->attr),
492 blobmsg_data_len(data->attr));
493 }
494
495 blobmsg_close_table(&buf, c);
496 ubus_send_reply(ctx, req, buf.head);
497
498 return 0;
499 }
500
501 static int
502 uh_ubus_handle_unset(struct ubus_context *ctx, struct ubus_object *obj,
503 struct ubus_request_data *req, const char *method,
504 struct blob_attr *msg)
505 {
506 struct uh_ubus_session *ses;
507 struct uh_ubus_session_data *data, *ndata;
508 struct blob_attr *tb[__UH_UBUS_SA_MAX];
509 struct blob_attr *attr;
510 int rem;
511
512 blobmsg_parse(get_policy, __UH_UBUS_SG_MAX, tb, blob_data(msg), blob_len(msg));
513
514 if (!tb[UH_UBUS_SG_SID])
515 return UBUS_STATUS_INVALID_ARGUMENT;
516
517 ses = uh_ubus_session_get(blobmsg_data(tb[UH_UBUS_SG_SID]));
518 if (!ses)
519 return UBUS_STATUS_NOT_FOUND;
520
521 if (!tb[UH_UBUS_SG_KEYS]) {
522 avl_remove_all_elements(&ses->data, data, avl, ndata)
523 free(data);
524 return 0;
525 }
526
527 blobmsg_for_each_attr(attr, tb[UH_UBUS_SG_KEYS], rem) {
528 if (blob_id(attr) != BLOBMSG_TYPE_STRING)
529 continue;
530
531 data = avl_find_element(&ses->data, blobmsg_data(attr), data, avl);
532 if (!data)
533 continue;
534
535 avl_delete(&ses->data, &data->avl);
536 free(data);
537 }
538
539 return 0;
540 }
541
542 static int
543 uh_ubus_handle_destroy(struct ubus_context *ctx, struct ubus_object *obj,
544 struct ubus_request_data *req, const char *method,
545 struct blob_attr *msg)
546 {
547 struct uh_ubus_session *ses;
548 struct blob_attr *tb;
549
550 blobmsg_parse(&sid_policy, 1, &tb, blob_data(msg), blob_len(msg));
551
552 if (!tb)
553 return UBUS_STATUS_INVALID_ARGUMENT;
554
555 ses = uh_ubus_session_get(blobmsg_data(tb));
556 if (!ses)
557 return UBUS_STATUS_NOT_FOUND;
558
559 uh_ubus_session_destroy(ses);
560
561 return 0;
562 }
563
564 bool uh_ubus_session_acl_allowed(struct uh_ubus_session *ses, const char *obj, const char *fun)
565 {
566 struct uh_ubus_session_acl *acl;
567
568 uh_foreach_matching_acl(acl, ses, obj, fun)
569 return true;
570
571 return false;
572 }
573
574 int ubus_session_api_init(struct ubus_context *ctx)
575 {
576 static const struct ubus_method session_methods[] = {
577 UBUS_METHOD("create", uh_ubus_handle_create, &new_policy),
578 UBUS_METHOD("list", uh_ubus_handle_list, &sid_policy),
579 UBUS_METHOD("grant", uh_ubus_handle_acl, acl_policy),
580 UBUS_METHOD("revoke", uh_ubus_handle_acl, acl_policy),
581 UBUS_METHOD("set", uh_ubus_handle_set, set_policy),
582 UBUS_METHOD("get", uh_ubus_handle_get, get_policy),
583 UBUS_METHOD("unset", uh_ubus_handle_unset, get_policy),
584 UBUS_METHOD("destroy", uh_ubus_handle_destroy, &sid_policy),
585 };
586
587 static struct ubus_object_type session_type =
588 UBUS_OBJECT_TYPE("uhttpd", session_methods);
589
590 static struct ubus_object obj = {
591 .name = "session",
592 .type = &session_type,
593 .methods = session_methods,
594 .n_methods = ARRAY_SIZE(session_methods),
595 };
596
597 avl_init(&sessions, avl_strcmp, false, NULL);
598
599 return ubus_add_object(ctx, &obj);
600 }
Tiny HTTP server