2 * Copyright (C) 2015 John Crispin <blogic@openwrt.org>
3 * Copyright (C) 2018 Hans Dedecker <dedeckeh@gmail.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License version 2.1
7 * as published by the Free Software Foundation
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
16 #include <sys/socket.h>
17 #include <sys/types.h>
26 #include <libubox/vlist.h>
27 #include <libubox/blobmsg_json.h>
28 #include <libubox/avl-cmp.h>
40 struct ubusd_acl_obj {
42 struct list_head list;
49 struct blob_attr *methods;
50 struct blob_attr *tags;
51 struct blob_attr *priv;
56 struct ubusd_acl_file {
57 struct vlist_node avl;
62 struct blob_attr *blob;
68 const char *ubusd_acl_dir = "/usr/share/acl.d";
69 static struct blob_buf bbuf;
70 static struct avl_tree ubusd_acls;
71 static int ubusd_acl_seq;
72 static struct ubus_object *acl_obj;
75 ubusd_acl_match_cred(struct ubus_client *cl, struct ubusd_acl_obj *obj)
77 if (obj->user && !strcmp(cl->user, obj->user))
80 if (obj->group && !strcmp(cl->group, obj->group))
87 ubusd_acl_check(struct ubus_client *cl, const char *obj,
88 const char *method, enum ubusd_acl_type type)
90 struct ubusd_acl_obj *acl;
93 if (!cl || !cl->uid || !obj)
97 * Since this tree is sorted alphabetically, we can only expect
98 * to find matching entries as long as the number of matching
99 * characters between the access list string and the object path
100 * is monotonically increasing.
102 avl_for_each_element(&ubusd_acls, acl, avl) {
103 const char *key = acl->avl.key;
107 full_match = ubus_strmatch_len(obj, key, &cur_match_len);
108 if (cur_match_len < match_len)
111 match_len = cur_match_len;
117 if (match_len != strlen(key))
121 if (ubusd_acl_match_cred(cl, acl))
125 case UBUS_ACL_PUBLISH:
130 case UBUS_ACL_SUBSCRIBE:
135 case UBUS_ACL_ACCESS:
137 struct blob_attr *cur;
140 blobmsg_for_each_attr(cur, acl->methods, rem)
141 if (blobmsg_type(cur) == BLOBMSG_TYPE_STRING)
142 if (!strcmp(method, blobmsg_get_string(cur)))
153 ubusd_acl_init_client(struct ubus_client *cl, int fd)
160 unsigned int len = sizeof(struct ucred);
162 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cred, &len) == -1)
165 memset(&cred, 0, sizeof(cred));
168 pwd = getpwuid(cred.uid);
172 group = getgrgid(cred.gid);
179 cl->group = strdup(group->gr_name);
180 cl->user = strdup(pwd->pw_name);
186 ubusd_acl_free_client(struct ubus_client *cl)
193 ubusd_acl_file_free(struct ubusd_acl_file *file)
195 struct ubusd_acl_obj *p, *q;
197 list_for_each_entry_safe(p, q, &file->acl, list) {
198 avl_delete(&ubusd_acls, &p->avl);
213 static const struct blobmsg_policy acl_obj_policy[__ACL_ACCESS_MAX] = {
214 [ACL_ACCESS_METHODS] = { .name = "methods", .type = BLOBMSG_TYPE_ARRAY },
215 [ACL_ACCESS_TAGS] = { .name = "tags", .type = BLOBMSG_TYPE_ARRAY },
216 [ACL_ACCESS_PRIV] = { .name = "acl", .type = BLOBMSG_TYPE_TABLE },
219 static struct ubusd_acl_obj*
220 ubusd_acl_alloc_obj(struct ubusd_acl_file *file, const char *obj)
222 struct ubusd_acl_obj *o;
223 int len = strlen(obj);
225 bool partial = false;
227 if (obj[len - 1] == '*') {
232 o = calloc_a(sizeof(*o), &k, len + 1);
233 o->partial = partial;
234 o->user = file->user;
235 o->group = file->group;
236 o->avl.key = memcpy(k, obj, len);
238 list_add(&o->list, &file->acl);
239 avl_insert(&ubusd_acls, &o->avl);
245 ubusd_acl_add_access(struct ubusd_acl_file *file, struct blob_attr *obj)
247 struct blob_attr *tb[__ACL_ACCESS_MAX];
248 struct ubusd_acl_obj *o;
250 blobmsg_parse(acl_obj_policy, __ACL_ACCESS_MAX, tb, blobmsg_data(obj),
251 blobmsg_data_len(obj));
253 if (!tb[ACL_ACCESS_METHODS] && !tb[ACL_ACCESS_TAGS] && !tb[ACL_ACCESS_PRIV])
256 o = ubusd_acl_alloc_obj(file, blobmsg_name(obj));
258 o->methods = tb[ACL_ACCESS_METHODS];
259 o->tags = tb[ACL_ACCESS_TAGS];
260 o->priv = tb[ACL_ACCESS_PRIV];
262 if (file->user || file->group)
267 ubusd_acl_add_subscribe(struct ubusd_acl_file *file, const char *obj)
269 struct ubusd_acl_obj *o = ubusd_acl_alloc_obj(file, obj);
275 ubusd_acl_add_publish(struct ubusd_acl_file *file, const char *obj)
277 struct ubusd_acl_obj *o = ubusd_acl_alloc_obj(file, obj);
292 static const struct blobmsg_policy acl_policy[__ACL_MAX] = {
293 [ACL_USER] = { .name = "user", .type = BLOBMSG_TYPE_STRING },
294 [ACL_GROUP] = { .name = "group", .type = BLOBMSG_TYPE_STRING },
295 [ACL_ACCESS] = { .name = "access", .type = BLOBMSG_TYPE_TABLE },
296 [ACL_PUBLISH] = { .name = "publish", .type = BLOBMSG_TYPE_ARRAY },
297 [ACL_SUBSCRIBE] = { .name = "subscribe", .type = BLOBMSG_TYPE_ARRAY },
298 [ACL_INHERIT] = { .name = "inherit", .type = BLOBMSG_TYPE_ARRAY },
302 ubusd_acl_file_add(struct ubusd_acl_file *file)
304 struct blob_attr *tb[__ACL_MAX], *cur;
307 blobmsg_parse(acl_policy, __ACL_MAX, tb, blob_data(file->blob),
308 blob_len(file->blob));
311 file->user = blobmsg_get_string(tb[ACL_USER]);
312 else if (tb[ACL_GROUP])
313 file->group = blobmsg_get_string(tb[ACL_GROUP]);
318 blobmsg_for_each_attr(cur, tb[ACL_ACCESS], rem)
319 ubusd_acl_add_access(file, cur);
321 if (tb[ACL_SUBSCRIBE])
322 blobmsg_for_each_attr(cur, tb[ACL_SUBSCRIBE], rem)
323 if (blobmsg_type(cur) == BLOBMSG_TYPE_STRING)
324 ubusd_acl_add_subscribe(file, blobmsg_get_string(cur));
327 blobmsg_for_each_attr(cur, tb[ACL_PUBLISH], rem)
328 if (blobmsg_type(cur) == BLOBMSG_TYPE_STRING)
329 ubusd_acl_add_publish(file, blobmsg_get_string(cur));
333 ubusd_acl_update_cb(struct vlist_tree *tree, struct vlist_node *node_new,
334 struct vlist_node *node_old)
336 struct ubusd_acl_file *file;
339 file = container_of(node_old, struct ubusd_acl_file, avl);
340 ubusd_acl_file_free(file);
344 file = container_of(node_new, struct ubusd_acl_file, avl);
345 ubusd_acl_file_add(file);
349 static struct ubus_msg_buf *
350 ubusd_create_sequence_event_msg(void *priv, const char *id)
354 blob_buf_init(&b, 0);
355 blob_put_int32(&b, UBUS_ATTR_OBJID, 0);
356 blob_put_string(&b, UBUS_ATTR_METHOD, id);
357 s = blob_nest_start(&b, UBUS_ATTR_DATA);
358 blobmsg_add_u32(&b, "sequence", ubusd_acl_seq);
359 blob_nest_end(&b, s);
361 return ubus_msg_new(b.head, blob_raw_len(b.head), true);
364 static VLIST_TREE(ubusd_acl_files, avl_strcmp, ubusd_acl_update_cb, false, false);
367 ubusd_acl_load_file(const char *filename)
369 struct ubusd_acl_file *file;
372 blob_buf_init(&bbuf, 0);
373 if (!blobmsg_add_json_from_file(&bbuf, filename)) {
374 syslog(LOG_ERR, "failed to parse %s\n", filename);
378 file = calloc_a(sizeof(*file), &blob, blob_raw_len(bbuf.head));
384 memcpy(blob, bbuf.head, blob_raw_len(bbuf.head));
385 INIT_LIST_HEAD(&file->acl);
387 vlist_add(&ubusd_acl_files, &file->avl, filename);
388 syslog(LOG_INFO, "loading %s\n", filename);
399 const char *suffix = "/*.json";
400 char *path = alloca(strlen(ubusd_acl_dir) + strlen(suffix) + 1);
402 sprintf(path, "%s%s", ubusd_acl_dir, suffix);
403 if (glob(path, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl))
406 vlist_update(&ubusd_acl_files);
407 for (j = 0; j < gl.gl_pathc; j++) {
408 if (stat(gl.gl_pathv[j], &st) || !S_ISREG(st.st_mode))
411 if (st.st_uid || st.st_gid) {
412 syslog(LOG_ERR, "%s has wrong owner\n", gl.gl_pathv[j]);
415 if (st.st_mode & (S_IWOTH | S_IWGRP | S_IXOTH)) {
416 syslog(LOG_ERR, "%s has wrong permissions\n", gl.gl_pathv[j]);
419 ubusd_acl_load_file(gl.gl_pathv[j]);
423 vlist_flush(&ubusd_acl_files);
425 ubusd_send_event(NULL, "ubus.acl.sequence", ubusd_create_sequence_event_msg, NULL);
429 ubusd_reply_add(struct ubus_object *obj)
431 struct ubusd_acl_obj *acl;
438 * Since this tree is sorted alphabetically, we can only expect
439 * to find matching entries as long as the number of matching
440 * characters between the access list string and the object path
441 * is monotonically increasing.
443 avl_for_each_element(&ubusd_acls, acl, avl) {
444 const char *key = acl->avl.key;
452 full_match = ubus_strmatch_len(obj->path.key, key, &cur_match_len);
453 if (cur_match_len < match_len)
456 match_len = cur_match_len;
462 if (match_len != strlen(key))
466 c = blobmsg_open_table(&b, NULL);
467 blobmsg_add_string(&b, "obj", obj->path.key);
469 blobmsg_add_string(&b, "user", acl->user);
471 blobmsg_add_string(&b, "group", acl->group);
473 blobmsg_add_field(&b, blobmsg_type(acl->priv), "acl",
474 blobmsg_data(acl->priv), blobmsg_data_len(acl->priv));
476 blobmsg_close_table(&b, c);
480 static int ubusd_reply_query(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr, struct blob_attr *msg)
482 struct ubus_object *obj;
485 if (!attr[UBUS_ATTR_OBJID])
486 return UBUS_STATUS_INVALID_ARGUMENT;
488 obj = ubusd_find_object(blob_get_u32(attr[UBUS_ATTR_OBJID]));
490 return UBUS_STATUS_NOT_FOUND;
492 blob_buf_init(&b, 0);
493 blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
494 d = blob_nest_start(&b, UBUS_ATTR_DATA);
496 blobmsg_add_u32(&b, "seq", ubusd_acl_seq);
497 a = blobmsg_open_array(&b, "acl");
498 list_for_each_entry(obj, &cl->objects, list)
499 ubusd_reply_add(obj);
500 blobmsg_close_table(&b, a);
502 blob_nest_end(&b, d);
504 ubus_proto_send_msg_from_blob(cl, ub, UBUS_MSG_DATA);
509 static int ubusd_acl_recv(struct ubus_client *cl, struct ubus_msg_buf *ub, const char *method, struct blob_attr *msg)
511 if (!strcmp(method, "query"))
512 return ubusd_reply_query(cl, ub, ubus_parse_msg(ub->data), msg);
514 return UBUS_STATUS_INVALID_COMMAND;
517 void ubusd_acl_init(void)
519 ubus_init_string_tree(&ubusd_acls, true);
520 acl_obj = ubusd_create_object_internal(NULL, UBUS_SYSTEM_OBJECT_ACL);
521 acl_obj->recv_msg = ubusd_acl_recv;