2 * Copyright (C) 2015 John Crispin <blogic@openwrt.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License version 2.1
6 * as published by the Free Software Foundation
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
15 #include <sys/socket.h>
16 #include <sys/types.h>
25 #include <libubox/vlist.h>
26 #include <libubox/blobmsg_json.h>
27 #include <libubox/avl-cmp.h>
39 struct ubusd_acl_obj
{
41 struct list_head list
;
46 struct blob_attr
*methods
;
47 struct blob_attr
*tags
;
48 struct blob_attr
*priv
;
53 struct ubusd_acl_file
{
54 struct vlist_node avl
;
59 struct blob_attr
*blob
;
65 const char *ubusd_acl_dir
= "/usr/share/acl.d";
66 static struct blob_buf bbuf
;
67 static struct avl_tree ubusd_acls
;
68 static int ubusd_acl_seq
;
69 static struct ubus_object
*acl_obj
;
72 ubusd_acl_match_path(const void *k1
, const void *k2
, void *ptr
)
74 const char *name
= k1
;
75 const char *match
= k2
;
76 char *wildcard
= strstr(match
, "\t");
79 return strncmp(name
, match
, wildcard
- match
);
81 return strcmp(name
, match
);
85 ubusd_acl_match_cred(struct ubus_client
*cl
, struct ubusd_acl_obj
*obj
)
87 if (obj
->user
&& !strcmp(cl
->user
, obj
->user
))
90 if (obj
->group
&& !strcmp(cl
->group
, obj
->group
))
97 ubusd_acl_check(struct ubus_client
*cl
, const char *obj
,
98 const char *method
, enum ubusd_acl_type type
)
100 struct ubusd_acl_obj
*acl
;
101 struct blob_attr
*cur
;
104 if (!cl
->gid
&& !cl
->uid
)
107 acl
= avl_find_ge_element(&ubusd_acls
, obj
, acl
, avl
);
109 int diff
= ubusd_acl_match_path(obj
, acl
->avl
.key
, NULL
);
114 if (ubusd_acl_match_cred(cl
, acl
)) {
115 acl
= avl_next_element(acl
, avl
);
120 case UBUS_ACL_PUBLISH
:
125 case UBUS_ACL_SUBSCRIBE
:
130 case UBUS_ACL_ACCESS
:
132 blobmsg_for_each_attr(cur
, acl
->methods
, rem
)
133 if (blobmsg_type(cur
) == BLOBMSG_TYPE_STRING
)
134 if (!ubusd_acl_match_path(method
, blobmsg_get_string(cur
), NULL
))
138 acl
= avl_next_element(acl
, avl
);
145 ubusd_acl_init_client(struct ubus_client
*cl
, int fd
)
152 unsigned int len
= sizeof(struct ucred
);
154 if (getsockopt(fd
, SOL_SOCKET
, SO_PEERCRED
, &cred
, &len
) == -1)
157 memset(&cred
, 0, sizeof(cred
));
160 pwd
= getpwuid(cred
.uid
);
164 group
= getgrgid(cred
.gid
);
171 cl
->group
= strdup(group
->gr_name
);
172 cl
->user
= strdup(pwd
->pw_name
);
178 ubusd_acl_file_free(struct ubusd_acl_file
*file
)
180 struct ubusd_acl_obj
*p
, *q
;
182 list_for_each_entry_safe(p
, q
, &file
->acl
, list
) {
183 avl_delete(&ubusd_acls
, &p
->avl
);
198 static const struct blobmsg_policy acl_obj_policy
[__ACL_ACCESS_MAX
] = {
199 [ACL_ACCESS_METHODS
] = { .name
= "methods", .type
= BLOBMSG_TYPE_ARRAY
},
200 [ACL_ACCESS_TAGS
] = { .name
= "tags", .type
= BLOBMSG_TYPE_ARRAY
},
201 [ACL_ACCESS_PRIV
] = { .name
= "acl", .type
= BLOBMSG_TYPE_TABLE
},
204 static struct ubusd_acl_obj
*
205 ubusd_acl_alloc_obj(struct ubusd_acl_file
*file
, const char *obj
)
207 struct ubusd_acl_obj
*o
;
210 o
= calloc_a(sizeof(*o
), &k
, strlen(obj
) + 1);
211 o
->user
= file
->user
;
212 o
->group
= file
->group
;
222 list_add(&o
->list
, &file
->acl
);
223 avl_insert(&ubusd_acls
, &o
->avl
);
229 ubusd_acl_add_access(struct ubusd_acl_file
*file
, struct blob_attr
*obj
)
231 struct blob_attr
*tb
[__ACL_ACCESS_MAX
];
232 struct ubusd_acl_obj
*o
;
234 blobmsg_parse(acl_obj_policy
, __ACL_ACCESS_MAX
, tb
, blobmsg_data(obj
),
235 blobmsg_data_len(obj
));
237 if (!tb
[ACL_ACCESS_METHODS
] && !tb
[ACL_ACCESS_TAGS
] && !tb
[ACL_ACCESS_PRIV
])
240 o
= ubusd_acl_alloc_obj(file
, blobmsg_name(obj
));
242 o
->methods
= tb
[ACL_ACCESS_METHODS
];
243 o
->tags
= tb
[ACL_ACCESS_TAGS
];
244 o
->priv
= tb
[ACL_ACCESS_PRIV
];
246 if (file
->user
|| file
->group
)
251 ubusd_acl_add_subscribe(struct ubusd_acl_file
*file
, const char *obj
)
253 struct ubusd_acl_obj
*o
= ubusd_acl_alloc_obj(file
, obj
);
259 ubusd_acl_add_publish(struct ubusd_acl_file
*file
, const char *obj
)
261 struct ubusd_acl_obj
*o
= ubusd_acl_alloc_obj(file
, obj
);
276 static const struct blobmsg_policy acl_policy
[__ACL_MAX
] = {
277 [ACL_USER
] = { .name
= "user", .type
= BLOBMSG_TYPE_STRING
},
278 [ACL_GROUP
] = { .name
= "group", .type
= BLOBMSG_TYPE_STRING
},
279 [ACL_ACCESS
] = { .name
= "access", .type
= BLOBMSG_TYPE_TABLE
},
280 [ACL_PUBLISH
] = { .name
= "publish", .type
= BLOBMSG_TYPE_ARRAY
},
281 [ACL_SUBSCRIBE
] = { .name
= "subscribe", .type
= BLOBMSG_TYPE_ARRAY
},
282 [ACL_INHERIT
] = { .name
= "inherit", .type
= BLOBMSG_TYPE_ARRAY
},
286 ubusd_acl_file_add(struct ubusd_acl_file
*file
)
288 struct blob_attr
*tb
[__ACL_MAX
], *cur
;
291 blobmsg_parse(acl_policy
, __ACL_MAX
, tb
, blob_data(file
->blob
),
292 blob_len(file
->blob
));
295 file
->user
= blobmsg_get_string(tb
[ACL_USER
]);
296 else if (tb
[ACL_GROUP
])
297 file
->group
= blobmsg_get_string(tb
[ACL_GROUP
]);
302 blobmsg_for_each_attr(cur
, tb
[ACL_ACCESS
], rem
)
303 ubusd_acl_add_access(file
, cur
);
305 if (tb
[ACL_SUBSCRIBE
])
306 blobmsg_for_each_attr(cur
, tb
[ACL_SUBSCRIBE
], rem
)
307 if (blobmsg_type(cur
) == BLOBMSG_TYPE_STRING
)
308 ubusd_acl_add_subscribe(file
, blobmsg_get_string(cur
));
311 blobmsg_for_each_attr(cur
, tb
[ACL_PUBLISH
], rem
)
312 if (blobmsg_type(cur
) == BLOBMSG_TYPE_STRING
)
313 ubusd_acl_add_publish(file
, blobmsg_get_string(cur
));
317 ubusd_acl_update_cb(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
318 struct vlist_node
*node_old
)
320 struct ubusd_acl_file
*file
;
323 file
= container_of(node_old
, struct ubusd_acl_file
, avl
);
324 ubusd_acl_file_free(file
);
328 file
= container_of(node_new
, struct ubusd_acl_file
, avl
);
329 ubusd_acl_file_add(file
);
333 static struct ubus_msg_buf
*
334 ubusd_create_sequence_event_msg(void *priv
, const char *id
)
338 blob_buf_init(&b
, 0);
339 blob_put_int32(&b
, UBUS_ATTR_OBJID
, 0);
340 blob_put_string(&b
, UBUS_ATTR_METHOD
, id
);
341 s
= blob_nest_start(&b
, UBUS_ATTR_DATA
);
342 blobmsg_add_u32(&b
, "sequence", ubusd_acl_seq
);
343 blob_nest_end(&b
, s
);
345 return ubus_msg_new(b
.head
, blob_raw_len(b
.head
), true);
348 static VLIST_TREE(ubusd_acl_files
, avl_strcmp
, ubusd_acl_update_cb
, false, false);
351 ubusd_acl_load_file(const char *filename
)
353 struct ubusd_acl_file
*file
;
356 blob_buf_init(&bbuf
, 0);
357 if (!blobmsg_add_json_from_file(&bbuf
, filename
)) {
358 syslog(LOG_ERR
, "failed to parse %s\n", filename
);
362 file
= calloc_a(sizeof(*file
), &blob
, blob_raw_len(bbuf
.head
));
368 memcpy(blob
, bbuf
.head
, blob_raw_len(bbuf
.head
));
369 INIT_LIST_HEAD(&file
->acl
);
371 vlist_add(&ubusd_acl_files
, &file
->avl
, filename
);
372 syslog(LOG_INFO
, "loading %s\n", filename
);
383 const char *suffix
= "/*.json";
384 char *path
= alloca(strlen(ubusd_acl_dir
) + strlen(suffix
) + 1);
386 sprintf(path
, "%s%s", ubusd_acl_dir
, suffix
);
387 if (glob(path
, GLOB_NOESCAPE
| GLOB_MARK
, NULL
, &gl
))
390 vlist_update(&ubusd_acl_files
);
391 for (j
= 0; j
< gl
.gl_pathc
; j
++) {
392 if (stat(gl
.gl_pathv
[j
], &st
) || !S_ISREG(st
.st_mode
))
395 if (st
.st_uid
|| st
.st_gid
) {
396 syslog(LOG_ERR
, "%s has wrong owner\n", gl
.gl_pathv
[j
]);
399 if (st
.st_mode
& (S_IWOTH
| S_IWGRP
| S_IXOTH
)) {
400 syslog(LOG_ERR
, "%s has wrong permissions\n", gl
.gl_pathv
[j
]);
403 ubusd_acl_load_file(gl
.gl_pathv
[j
]);
407 vlist_flush(&ubusd_acl_files
);
409 ubusd_send_event(NULL
, "ubus.acl.sequence", ubusd_create_sequence_event_msg
, NULL
);
413 ubusd_reply_add(struct ubus_object
*obj
)
415 struct ubusd_acl_obj
*acl
;
419 acl
= avl_find_ge_element(&ubusd_acls
, obj
->path
.key
, acl
, avl
);
420 while (acl
&& !avl_is_last(&ubusd_acls
, &acl
->avl
) &&
421 !ubusd_acl_match_path(obj
->path
.key
, acl
->avl
.key
, NULL
)) {
424 void *c
= blobmsg_open_table(&b
, NULL
);
426 blobmsg_add_string(&b
, "obj", obj
->path
.key
);
428 blobmsg_add_string(&b
, "user", acl
->user
);
430 blobmsg_add_string(&b
, "group", acl
->group
);
433 blobmsg_add_field(&b
, blobmsg_type(acl
->priv
), "acl",
434 blobmsg_data(acl
->priv
), blobmsg_data_len(acl
->priv
));
436 blobmsg_close_table(&b
, c
);
438 acl
= avl_next_element(acl
, avl
);
441 static int ubusd_reply_query(struct ubus_client
*cl
, struct ubus_msg_buf
*ub
, struct blob_attr
**attr
, struct blob_attr
*msg
)
443 struct ubus_object
*obj
;
446 if (!attr
[UBUS_ATTR_OBJID
])
447 return UBUS_STATUS_INVALID_ARGUMENT
;
449 obj
= ubusd_find_object(blob_get_u32(attr
[UBUS_ATTR_OBJID
]));
451 return UBUS_STATUS_NOT_FOUND
;
453 blob_buf_init(&b
, 0);
454 blob_put_int32(&b
, UBUS_ATTR_OBJID
, obj
->id
.id
);
455 d
= blob_nest_start(&b
, UBUS_ATTR_DATA
);
457 blobmsg_add_u32(&b
, "seq", ubusd_acl_seq
);
458 a
= blobmsg_open_array(&b
, "acl");
459 list_for_each_entry(obj
, &cl
->objects
, list
)
460 ubusd_reply_add(obj
);
461 blobmsg_close_table(&b
, a
);
463 blob_nest_end(&b
, d
);
465 ubus_proto_send_msg_from_blob(cl
, ub
, UBUS_MSG_DATA
);
470 static int ubusd_acl_recv(struct ubus_client
*cl
, struct ubus_msg_buf
*ub
, const char *method
, struct blob_attr
*msg
)
472 if (!strcmp(method
, "query"))
473 return ubusd_reply_query(cl
, ub
, ubus_parse_msg(ub
->data
), msg
);
475 return UBUS_STATUS_INVALID_COMMAND
;
478 void ubusd_acl_init(void)
480 avl_init(&ubusd_acls
, ubusd_acl_match_path
, true, NULL
);
481 acl_obj
= ubusd_create_object_internal(NULL
, UBUS_SYSTEM_OBJECT_ACL
);
482 acl_obj
->recv_msg
= ubusd_acl_recv
;