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
);
108 avl_for_element_to_last(&ubusd_acls
, acl
, acl
, avl
) {
109 int diff
= ubusd_acl_match_path(obj
, acl
->avl
.key
, NULL
);
114 if (ubusd_acl_match_cred(cl
, acl
))
118 case UBUS_ACL_PUBLISH
:
123 case UBUS_ACL_SUBSCRIBE
:
128 case UBUS_ACL_ACCESS
:
130 blobmsg_for_each_attr(cur
, acl
->methods
, rem
)
131 if (blobmsg_type(cur
) == BLOBMSG_TYPE_STRING
)
132 if (!ubusd_acl_match_path(method
, blobmsg_get_string(cur
), NULL
))
142 ubusd_acl_init_client(struct ubus_client
*cl
, int fd
)
149 unsigned int len
= sizeof(struct ucred
);
151 if (getsockopt(fd
, SOL_SOCKET
, SO_PEERCRED
, &cred
, &len
) == -1)
154 memset(&cred
, 0, sizeof(cred
));
157 pwd
= getpwuid(cred
.uid
);
161 group
= getgrgid(cred
.gid
);
168 cl
->group
= strdup(group
->gr_name
);
169 cl
->user
= strdup(pwd
->pw_name
);
175 ubusd_acl_file_free(struct ubusd_acl_file
*file
)
177 struct ubusd_acl_obj
*p
, *q
;
179 list_for_each_entry_safe(p
, q
, &file
->acl
, list
) {
180 avl_delete(&ubusd_acls
, &p
->avl
);
195 static const struct blobmsg_policy acl_obj_policy
[__ACL_ACCESS_MAX
] = {
196 [ACL_ACCESS_METHODS
] = { .name
= "methods", .type
= BLOBMSG_TYPE_ARRAY
},
197 [ACL_ACCESS_TAGS
] = { .name
= "tags", .type
= BLOBMSG_TYPE_ARRAY
},
198 [ACL_ACCESS_PRIV
] = { .name
= "acl", .type
= BLOBMSG_TYPE_TABLE
},
201 static struct ubusd_acl_obj
*
202 ubusd_acl_alloc_obj(struct ubusd_acl_file
*file
, const char *obj
)
204 struct ubusd_acl_obj
*o
;
207 o
= calloc_a(sizeof(*o
), &k
, strlen(obj
) + 1);
208 o
->user
= file
->user
;
209 o
->group
= file
->group
;
219 list_add(&o
->list
, &file
->acl
);
220 avl_insert(&ubusd_acls
, &o
->avl
);
226 ubusd_acl_add_access(struct ubusd_acl_file
*file
, struct blob_attr
*obj
)
228 struct blob_attr
*tb
[__ACL_ACCESS_MAX
];
229 struct ubusd_acl_obj
*o
;
231 blobmsg_parse(acl_obj_policy
, __ACL_ACCESS_MAX
, tb
, blobmsg_data(obj
),
232 blobmsg_data_len(obj
));
234 if (!tb
[ACL_ACCESS_METHODS
] && !tb
[ACL_ACCESS_TAGS
] && !tb
[ACL_ACCESS_PRIV
])
237 o
= ubusd_acl_alloc_obj(file
, blobmsg_name(obj
));
239 o
->methods
= tb
[ACL_ACCESS_METHODS
];
240 o
->tags
= tb
[ACL_ACCESS_TAGS
];
241 o
->priv
= tb
[ACL_ACCESS_PRIV
];
243 if (file
->user
|| file
->group
)
248 ubusd_acl_add_subscribe(struct ubusd_acl_file
*file
, const char *obj
)
250 struct ubusd_acl_obj
*o
= ubusd_acl_alloc_obj(file
, obj
);
256 ubusd_acl_add_publish(struct ubusd_acl_file
*file
, const char *obj
)
258 struct ubusd_acl_obj
*o
= ubusd_acl_alloc_obj(file
, obj
);
273 static const struct blobmsg_policy acl_policy
[__ACL_MAX
] = {
274 [ACL_USER
] = { .name
= "user", .type
= BLOBMSG_TYPE_STRING
},
275 [ACL_GROUP
] = { .name
= "group", .type
= BLOBMSG_TYPE_STRING
},
276 [ACL_ACCESS
] = { .name
= "access", .type
= BLOBMSG_TYPE_TABLE
},
277 [ACL_PUBLISH
] = { .name
= "publish", .type
= BLOBMSG_TYPE_ARRAY
},
278 [ACL_SUBSCRIBE
] = { .name
= "subscribe", .type
= BLOBMSG_TYPE_ARRAY
},
279 [ACL_INHERIT
] = { .name
= "inherit", .type
= BLOBMSG_TYPE_ARRAY
},
283 ubusd_acl_file_add(struct ubusd_acl_file
*file
)
285 struct blob_attr
*tb
[__ACL_MAX
], *cur
;
288 blobmsg_parse(acl_policy
, __ACL_MAX
, tb
, blob_data(file
->blob
),
289 blob_len(file
->blob
));
292 file
->user
= blobmsg_get_string(tb
[ACL_USER
]);
293 else if (tb
[ACL_GROUP
])
294 file
->group
= blobmsg_get_string(tb
[ACL_GROUP
]);
299 blobmsg_for_each_attr(cur
, tb
[ACL_ACCESS
], rem
)
300 ubusd_acl_add_access(file
, cur
);
302 if (tb
[ACL_SUBSCRIBE
])
303 blobmsg_for_each_attr(cur
, tb
[ACL_SUBSCRIBE
], rem
)
304 if (blobmsg_type(cur
) == BLOBMSG_TYPE_STRING
)
305 ubusd_acl_add_subscribe(file
, blobmsg_get_string(cur
));
308 blobmsg_for_each_attr(cur
, tb
[ACL_PUBLISH
], rem
)
309 if (blobmsg_type(cur
) == BLOBMSG_TYPE_STRING
)
310 ubusd_acl_add_publish(file
, blobmsg_get_string(cur
));
314 ubusd_acl_update_cb(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
315 struct vlist_node
*node_old
)
317 struct ubusd_acl_file
*file
;
320 file
= container_of(node_old
, struct ubusd_acl_file
, avl
);
321 ubusd_acl_file_free(file
);
325 file
= container_of(node_new
, struct ubusd_acl_file
, avl
);
326 ubusd_acl_file_add(file
);
330 static struct ubus_msg_buf
*
331 ubusd_create_sequence_event_msg(void *priv
, const char *id
)
335 blob_buf_init(&b
, 0);
336 blob_put_int32(&b
, UBUS_ATTR_OBJID
, 0);
337 blob_put_string(&b
, UBUS_ATTR_METHOD
, id
);
338 s
= blob_nest_start(&b
, UBUS_ATTR_DATA
);
339 blobmsg_add_u32(&b
, "sequence", ubusd_acl_seq
);
340 blob_nest_end(&b
, s
);
342 return ubus_msg_new(b
.head
, blob_raw_len(b
.head
), true);
345 static VLIST_TREE(ubusd_acl_files
, avl_strcmp
, ubusd_acl_update_cb
, false, false);
348 ubusd_acl_load_file(const char *filename
)
350 struct ubusd_acl_file
*file
;
353 blob_buf_init(&bbuf
, 0);
354 if (!blobmsg_add_json_from_file(&bbuf
, filename
)) {
355 syslog(LOG_ERR
, "failed to parse %s\n", filename
);
359 file
= calloc_a(sizeof(*file
), &blob
, blob_raw_len(bbuf
.head
));
365 memcpy(blob
, bbuf
.head
, blob_raw_len(bbuf
.head
));
366 INIT_LIST_HEAD(&file
->acl
);
368 vlist_add(&ubusd_acl_files
, &file
->avl
, filename
);
369 syslog(LOG_INFO
, "loading %s\n", filename
);
380 const char *suffix
= "/*.json";
381 char *path
= alloca(strlen(ubusd_acl_dir
) + strlen(suffix
) + 1);
383 sprintf(path
, "%s%s", ubusd_acl_dir
, suffix
);
384 if (glob(path
, GLOB_NOESCAPE
| GLOB_MARK
, NULL
, &gl
))
387 vlist_update(&ubusd_acl_files
);
388 for (j
= 0; j
< gl
.gl_pathc
; j
++) {
389 if (stat(gl
.gl_pathv
[j
], &st
) || !S_ISREG(st
.st_mode
))
392 if (st
.st_uid
|| st
.st_gid
) {
393 syslog(LOG_ERR
, "%s has wrong owner\n", gl
.gl_pathv
[j
]);
396 if (st
.st_mode
& (S_IWOTH
| S_IWGRP
| S_IXOTH
)) {
397 syslog(LOG_ERR
, "%s has wrong permissions\n", gl
.gl_pathv
[j
]);
400 ubusd_acl_load_file(gl
.gl_pathv
[j
]);
404 vlist_flush(&ubusd_acl_files
);
406 ubusd_send_event(NULL
, "ubus.acl.sequence", ubusd_create_sequence_event_msg
, NULL
);
410 ubusd_reply_add(struct ubus_object
*obj
)
412 struct ubusd_acl_obj
*acl
;
416 acl
= avl_find_ge_element(&ubusd_acls
, obj
->path
.key
, acl
, avl
);
417 while (acl
&& !avl_is_last(&ubusd_acls
, &acl
->avl
) &&
418 !ubusd_acl_match_path(obj
->path
.key
, acl
->avl
.key
, NULL
)) {
421 void *c
= blobmsg_open_table(&b
, NULL
);
423 blobmsg_add_string(&b
, "obj", obj
->path
.key
);
425 blobmsg_add_string(&b
, "user", acl
->user
);
427 blobmsg_add_string(&b
, "group", acl
->group
);
430 blobmsg_add_field(&b
, blobmsg_type(acl
->priv
), "acl",
431 blobmsg_data(acl
->priv
), blobmsg_data_len(acl
->priv
));
433 blobmsg_close_table(&b
, c
);
435 acl
= avl_next_element(acl
, avl
);
438 static int ubusd_reply_query(struct ubus_client
*cl
, struct ubus_msg_buf
*ub
, struct blob_attr
**attr
, struct blob_attr
*msg
)
440 struct ubus_object
*obj
;
443 if (!attr
[UBUS_ATTR_OBJID
])
444 return UBUS_STATUS_INVALID_ARGUMENT
;
446 obj
= ubusd_find_object(blob_get_u32(attr
[UBUS_ATTR_OBJID
]));
448 return UBUS_STATUS_NOT_FOUND
;
450 blob_buf_init(&b
, 0);
451 blob_put_int32(&b
, UBUS_ATTR_OBJID
, obj
->id
.id
);
452 d
= blob_nest_start(&b
, UBUS_ATTR_DATA
);
454 blobmsg_add_u32(&b
, "seq", ubusd_acl_seq
);
455 a
= blobmsg_open_array(&b
, "acl");
456 list_for_each_entry(obj
, &cl
->objects
, list
)
457 ubusd_reply_add(obj
);
458 blobmsg_close_table(&b
, a
);
460 blob_nest_end(&b
, d
);
462 ubus_proto_send_msg_from_blob(cl
, ub
, UBUS_MSG_DATA
);
467 static int ubusd_acl_recv(struct ubus_client
*cl
, struct ubus_msg_buf
*ub
, const char *method
, struct blob_attr
*msg
)
469 if (!strcmp(method
, "query"))
470 return ubusd_reply_query(cl
, ub
, ubus_parse_msg(ub
->data
), msg
);
472 return UBUS_STATUS_INVALID_COMMAND
;
475 void ubusd_acl_init(void)
477 avl_init(&ubusd_acls
, ubusd_acl_match_path
, true, NULL
);
478 acl_obj
= ubusd_create_object_internal(NULL
, UBUS_SYSTEM_OBJECT_ACL
);
479 acl_obj
->recv_msg
= ubusd_acl_recv
;