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
->uid
|| !obj
)
107 acl
= avl_find_ge_element(&ubusd_acls
, obj
, acl
, avl
);
111 avl_for_element_to_last(&ubusd_acls
, acl
, acl
, avl
) {
112 int diff
= ubusd_acl_match_path(obj
, acl
->avl
.key
, NULL
);
117 if (ubusd_acl_match_cred(cl
, acl
))
121 case UBUS_ACL_PUBLISH
:
126 case UBUS_ACL_SUBSCRIBE
:
131 case UBUS_ACL_ACCESS
:
133 blobmsg_for_each_attr(cur
, acl
->methods
, rem
)
134 if (blobmsg_type(cur
) == BLOBMSG_TYPE_STRING
)
135 if (!ubusd_acl_match_path(method
, blobmsg_get_string(cur
), NULL
))
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_free_client(struct ubus_client
*cl
)
185 ubusd_acl_file_free(struct ubusd_acl_file
*file
)
187 struct ubusd_acl_obj
*p
, *q
;
189 list_for_each_entry_safe(p
, q
, &file
->acl
, list
) {
190 avl_delete(&ubusd_acls
, &p
->avl
);
205 static const struct blobmsg_policy acl_obj_policy
[__ACL_ACCESS_MAX
] = {
206 [ACL_ACCESS_METHODS
] = { .name
= "methods", .type
= BLOBMSG_TYPE_ARRAY
},
207 [ACL_ACCESS_TAGS
] = { .name
= "tags", .type
= BLOBMSG_TYPE_ARRAY
},
208 [ACL_ACCESS_PRIV
] = { .name
= "acl", .type
= BLOBMSG_TYPE_TABLE
},
211 static struct ubusd_acl_obj
*
212 ubusd_acl_alloc_obj(struct ubusd_acl_file
*file
, const char *obj
)
214 struct ubusd_acl_obj
*o
;
217 o
= calloc_a(sizeof(*o
), &k
, strlen(obj
) + 1);
218 o
->user
= file
->user
;
219 o
->group
= file
->group
;
229 list_add(&o
->list
, &file
->acl
);
230 avl_insert(&ubusd_acls
, &o
->avl
);
236 ubusd_acl_add_access(struct ubusd_acl_file
*file
, struct blob_attr
*obj
)
238 struct blob_attr
*tb
[__ACL_ACCESS_MAX
];
239 struct ubusd_acl_obj
*o
;
241 blobmsg_parse(acl_obj_policy
, __ACL_ACCESS_MAX
, tb
, blobmsg_data(obj
),
242 blobmsg_data_len(obj
));
244 if (!tb
[ACL_ACCESS_METHODS
] && !tb
[ACL_ACCESS_TAGS
] && !tb
[ACL_ACCESS_PRIV
])
247 o
= ubusd_acl_alloc_obj(file
, blobmsg_name(obj
));
249 o
->methods
= tb
[ACL_ACCESS_METHODS
];
250 o
->tags
= tb
[ACL_ACCESS_TAGS
];
251 o
->priv
= tb
[ACL_ACCESS_PRIV
];
253 if (file
->user
|| file
->group
)
258 ubusd_acl_add_subscribe(struct ubusd_acl_file
*file
, const char *obj
)
260 struct ubusd_acl_obj
*o
= ubusd_acl_alloc_obj(file
, obj
);
266 ubusd_acl_add_publish(struct ubusd_acl_file
*file
, const char *obj
)
268 struct ubusd_acl_obj
*o
= ubusd_acl_alloc_obj(file
, obj
);
283 static const struct blobmsg_policy acl_policy
[__ACL_MAX
] = {
284 [ACL_USER
] = { .name
= "user", .type
= BLOBMSG_TYPE_STRING
},
285 [ACL_GROUP
] = { .name
= "group", .type
= BLOBMSG_TYPE_STRING
},
286 [ACL_ACCESS
] = { .name
= "access", .type
= BLOBMSG_TYPE_TABLE
},
287 [ACL_PUBLISH
] = { .name
= "publish", .type
= BLOBMSG_TYPE_ARRAY
},
288 [ACL_SUBSCRIBE
] = { .name
= "subscribe", .type
= BLOBMSG_TYPE_ARRAY
},
289 [ACL_INHERIT
] = { .name
= "inherit", .type
= BLOBMSG_TYPE_ARRAY
},
293 ubusd_acl_file_add(struct ubusd_acl_file
*file
)
295 struct blob_attr
*tb
[__ACL_MAX
], *cur
;
298 blobmsg_parse(acl_policy
, __ACL_MAX
, tb
, blob_data(file
->blob
),
299 blob_len(file
->blob
));
302 file
->user
= blobmsg_get_string(tb
[ACL_USER
]);
303 else if (tb
[ACL_GROUP
])
304 file
->group
= blobmsg_get_string(tb
[ACL_GROUP
]);
309 blobmsg_for_each_attr(cur
, tb
[ACL_ACCESS
], rem
)
310 ubusd_acl_add_access(file
, cur
);
312 if (tb
[ACL_SUBSCRIBE
])
313 blobmsg_for_each_attr(cur
, tb
[ACL_SUBSCRIBE
], rem
)
314 if (blobmsg_type(cur
) == BLOBMSG_TYPE_STRING
)
315 ubusd_acl_add_subscribe(file
, blobmsg_get_string(cur
));
318 blobmsg_for_each_attr(cur
, tb
[ACL_PUBLISH
], rem
)
319 if (blobmsg_type(cur
) == BLOBMSG_TYPE_STRING
)
320 ubusd_acl_add_publish(file
, blobmsg_get_string(cur
));
324 ubusd_acl_update_cb(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
325 struct vlist_node
*node_old
)
327 struct ubusd_acl_file
*file
;
330 file
= container_of(node_old
, struct ubusd_acl_file
, avl
);
331 ubusd_acl_file_free(file
);
335 file
= container_of(node_new
, struct ubusd_acl_file
, avl
);
336 ubusd_acl_file_add(file
);
340 static struct ubus_msg_buf
*
341 ubusd_create_sequence_event_msg(void *priv
, const char *id
)
345 blob_buf_init(&b
, 0);
346 blob_put_int32(&b
, UBUS_ATTR_OBJID
, 0);
347 blob_put_string(&b
, UBUS_ATTR_METHOD
, id
);
348 s
= blob_nest_start(&b
, UBUS_ATTR_DATA
);
349 blobmsg_add_u32(&b
, "sequence", ubusd_acl_seq
);
350 blob_nest_end(&b
, s
);
352 return ubus_msg_new(b
.head
, blob_raw_len(b
.head
), true);
355 static VLIST_TREE(ubusd_acl_files
, avl_strcmp
, ubusd_acl_update_cb
, false, false);
358 ubusd_acl_load_file(const char *filename
)
360 struct ubusd_acl_file
*file
;
363 blob_buf_init(&bbuf
, 0);
364 if (!blobmsg_add_json_from_file(&bbuf
, filename
)) {
365 syslog(LOG_ERR
, "failed to parse %s\n", filename
);
369 file
= calloc_a(sizeof(*file
), &blob
, blob_raw_len(bbuf
.head
));
375 memcpy(blob
, bbuf
.head
, blob_raw_len(bbuf
.head
));
376 INIT_LIST_HEAD(&file
->acl
);
378 vlist_add(&ubusd_acl_files
, &file
->avl
, filename
);
379 syslog(LOG_INFO
, "loading %s\n", filename
);
390 const char *suffix
= "/*.json";
391 char *path
= alloca(strlen(ubusd_acl_dir
) + strlen(suffix
) + 1);
393 sprintf(path
, "%s%s", ubusd_acl_dir
, suffix
);
394 if (glob(path
, GLOB_NOESCAPE
| GLOB_MARK
, NULL
, &gl
))
397 vlist_update(&ubusd_acl_files
);
398 for (j
= 0; j
< gl
.gl_pathc
; j
++) {
399 if (stat(gl
.gl_pathv
[j
], &st
) || !S_ISREG(st
.st_mode
))
402 if (st
.st_uid
|| st
.st_gid
) {
403 syslog(LOG_ERR
, "%s has wrong owner\n", gl
.gl_pathv
[j
]);
406 if (st
.st_mode
& (S_IWOTH
| S_IWGRP
| S_IXOTH
)) {
407 syslog(LOG_ERR
, "%s has wrong permissions\n", gl
.gl_pathv
[j
]);
410 ubusd_acl_load_file(gl
.gl_pathv
[j
]);
414 vlist_flush(&ubusd_acl_files
);
416 ubusd_send_event(NULL
, "ubus.acl.sequence", ubusd_create_sequence_event_msg
, NULL
);
420 ubusd_reply_add(struct ubus_object
*obj
)
422 struct ubusd_acl_obj
*acl
;
427 acl
= avl_find_ge_element(&ubusd_acls
, obj
->path
.key
, acl
, avl
);
431 avl_for_element_to_last(&ubusd_acls
, acl
, acl
, avl
) {
437 if (!ubusd_acl_match_path(obj
->path
.key
, acl
->avl
.key
, NULL
))
440 c
= blobmsg_open_table(&b
, NULL
);
441 blobmsg_add_string(&b
, "obj", obj
->path
.key
);
443 blobmsg_add_string(&b
, "user", acl
->user
);
445 blobmsg_add_string(&b
, "group", acl
->group
);
447 blobmsg_add_field(&b
, blobmsg_type(acl
->priv
), "acl",
448 blobmsg_data(acl
->priv
), blobmsg_data_len(acl
->priv
));
450 blobmsg_close_table(&b
, c
);
453 static int ubusd_reply_query(struct ubus_client
*cl
, struct ubus_msg_buf
*ub
, struct blob_attr
**attr
, struct blob_attr
*msg
)
455 struct ubus_object
*obj
;
458 if (!attr
[UBUS_ATTR_OBJID
])
459 return UBUS_STATUS_INVALID_ARGUMENT
;
461 obj
= ubusd_find_object(blob_get_u32(attr
[UBUS_ATTR_OBJID
]));
463 return UBUS_STATUS_NOT_FOUND
;
465 blob_buf_init(&b
, 0);
466 blob_put_int32(&b
, UBUS_ATTR_OBJID
, obj
->id
.id
);
467 d
= blob_nest_start(&b
, UBUS_ATTR_DATA
);
469 blobmsg_add_u32(&b
, "seq", ubusd_acl_seq
);
470 a
= blobmsg_open_array(&b
, "acl");
471 list_for_each_entry(obj
, &cl
->objects
, list
)
472 ubusd_reply_add(obj
);
473 blobmsg_close_table(&b
, a
);
475 blob_nest_end(&b
, d
);
477 ubus_proto_send_msg_from_blob(cl
, ub
, UBUS_MSG_DATA
);
482 static int ubusd_acl_recv(struct ubus_client
*cl
, struct ubus_msg_buf
*ub
, const char *method
, struct blob_attr
*msg
)
484 if (!strcmp(method
, "query"))
485 return ubusd_reply_query(cl
, ub
, ubus_parse_msg(ub
->data
), msg
);
487 return UBUS_STATUS_INVALID_COMMAND
;
490 void ubusd_acl_init(void)
492 avl_init(&ubusd_acls
, ubusd_acl_match_path
, true, NULL
);
493 acl_obj
= ubusd_create_object_internal(NULL
, UBUS_SYSTEM_OBJECT_ACL
);
494 acl_obj
->recv_msg
= ubusd_acl_recv
;