--- /dev/null
+/*
+ * Copyright (C) 2015 John Cripin <blogic@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <unistd.h>
+
+#include <libubox/blob.h>
+#include <libubox/blobmsg.h>
+
+#include "libubus.h"
+#include <libubox/avl-cmp.h>
+
+static struct ubus_event_handler acl_event;
+static struct ubus_request acl_req;
+static struct blob_attr *acl_blob;
+
+static int acl_cmp(const void *k1, const void *k2, void *ptr)
+{
+ const struct ubus_acl_key *key1 = k1;
+ const struct ubus_acl_key *key2 = k2;
+ int ret = 0;
+
+ if (key1->user && key2->user)
+ ret = strcmp(key1->user, key2->user);
+ if (ret)
+ return ret;
+
+ if (key1->group && key2->group)
+ ret = strcmp(key1->group, key2->group);
+ if (ret)
+ return ret;
+
+ return strcmp(key1->object, key2->object);
+}
+
+AVL_TREE(acl_objects, acl_cmp, true, NULL);
+
+enum {
+ ACL_OBJ_OBJECT,
+ ACL_OBJ_USER,
+ ACL_OBJ_GROUP,
+ ACL_OBJ_ACL,
+ __ACL_OBJ_MAX
+};
+
+static const struct blobmsg_policy acl_obj_policy[__ACL_OBJ_MAX] = {
+ [ACL_OBJ_OBJECT] = { .name = "obj", .type = BLOBMSG_TYPE_STRING },
+ [ACL_OBJ_USER] = { .name = "user", .type = BLOBMSG_TYPE_STRING },
+ [ACL_OBJ_GROUP] = { .name = "group", .type = BLOBMSG_TYPE_STRING },
+ [ACL_OBJ_ACL] = { .name = "acl", .type = BLOBMSG_TYPE_TABLE },
+};
+
+static void
+acl_add(struct blob_attr *obj)
+{
+ struct blob_attr *tb[__ACL_OBJ_MAX];
+ struct acl_object *acl;
+
+ blobmsg_parse(acl_obj_policy, __ACL_OBJ_MAX, tb, blobmsg_data(obj),
+ blobmsg_data_len(obj));
+
+ if (!tb[ACL_OBJ_OBJECT] || !tb[ACL_OBJ_ACL])
+ return;
+
+ if (!tb[ACL_OBJ_USER] && !tb[ACL_OBJ_GROUP])
+ return;
+
+ acl = calloc(1, sizeof(*acl));
+ if (!acl)
+ return;
+
+ acl->avl.key = &acl->key;
+ acl->key.object = blobmsg_get_string(tb[ACL_OBJ_OBJECT]);
+ acl->key.user = blobmsg_get_string(tb[ACL_OBJ_USER]);
+ acl->key.group = blobmsg_get_string(tb[ACL_OBJ_GROUP]);
+ acl->acl = tb[ACL_OBJ_ACL];
+ avl_insert(&acl_objects, &acl->avl);
+}
+
+enum {
+ ACL_POLICY_SEQ,
+ ACL_POLICY_ACL,
+ __ACL_POLICY_MAX
+};
+
+static const struct blobmsg_policy acl_policy[__ACL_POLICY_MAX] = {
+ [ACL_POLICY_SEQ] = { .name = "seq", .type = BLOBMSG_TYPE_INT32 },
+ [ACL_POLICY_ACL] = { .name = "acl", .type = BLOBMSG_TYPE_ARRAY },
+};
+
+static void acl_recv_cb(struct ubus_request *req,
+ int type, struct blob_attr *msg)
+{
+ struct blob_attr *tb[__ACL_POLICY_MAX];
+ struct blob_attr *cur;
+ int rem;
+
+ if (acl_blob) {
+ struct acl_object *p, *q;
+
+ avl_for_each_element_safe(&acl_objects, p, avl, q) {
+ avl_delete(&acl_objects, &p->avl);
+ free(p);
+ }
+ free(acl_blob);
+ }
+ acl_blob = blob_memdup(msg);
+ blobmsg_parse(acl_policy, __ACL_POLICY_MAX, tb, blobmsg_data(msg),
+ blobmsg_data_len(msg));
+
+ if (!tb[ACL_POLICY_SEQ] && !tb[ACL_POLICY_ACL])
+ return;
+
+ blobmsg_for_each_attr(cur, tb[ACL_POLICY_ACL], rem)
+ acl_add(cur);
+}
+
+static void acl_query(struct ubus_context *ctx)
+{
+ ubus_invoke_async(ctx, UBUS_SYSTEM_OBJECT_ACL, "query", NULL, &acl_req);
+ acl_req.data_cb = acl_recv_cb;
+ ubus_complete_request_async(ctx, &acl_req);
+}
+
+static void acl_subscribe_cb(struct ubus_context *ctx, struct ubus_event_handler *ev,
+ const char *type, struct blob_attr *msg)
+{
+ if (strcmp(type, "ubus.acl.sequence"))
+ return;
+ acl_query(ctx);
+}
+
+int ubus_register_acl(struct ubus_context *ctx)
+{
+ int ret;
+
+ acl_event.cb = acl_subscribe_cb;
+
+ ret = ubus_register_event_handler(ctx, &acl_event, "ubus.acl.sequence");
+ if (!ret)
+ acl_query(ctx);
+
+ return ret;
+}
--- /dev/null
+/*
+ * Copyright (C) 2015 John Crispin <blogic@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define _GNU_SOURCE
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <syslog.h>
+#include <unistd.h>
+#include <glob.h>
+#include <grp.h>
+#include <pwd.h>
+
+#include <libubox/vlist.h>
+#include <libubox/blobmsg_json.h>
+#include <libubox/avl-cmp.h>
+
+#include "ubusd.h"
+
+struct ubusd_acl_obj {
+ struct avl_node avl;
+ struct list_head list;
+
+ const char *user;
+ const char *group;
+
+ struct blob_attr *methods;
+ struct blob_attr *tags;
+ struct blob_attr *priv;
+ bool subscribe;
+ bool publish;
+};
+
+struct ubusd_acl_file {
+ struct vlist_node avl;
+
+ const char *user;
+ const char *group;
+
+ struct blob_attr *blob;
+ struct list_head acl;
+
+ int ok;
+};
+
+static struct blob_buf bbuf;
+static struct avl_tree ubusd_acls;
+static int ubusd_acl_seq;
+static struct ubus_object *acl_obj;
+
+static int
+ubusd_acl_match_path(const void *k1, const void *k2, void *ptr)
+{
+ const char *name = k1;
+ const char *match = k2;
+ char *wildcard = strstr(match, "\t");
+
+ if (wildcard)
+ return strncmp(name, match, wildcard - match);
+
+ return strcmp(name, match);
+}
+
+static int
+ubusd_acl_match_cred(struct ubus_client *cl, struct ubusd_acl_obj *obj)
+{
+ if (obj->user && !strcmp(cl->user, obj->user))
+ return 0;
+
+ if (obj->group && !strcmp(cl->group, obj->group))
+ return 0;
+
+ return -1;
+}
+
+int
+ubusd_acl_check(struct ubus_client *cl, const char *obj,
+ const char *method, enum ubusd_acl_type type)
+{
+ struct ubusd_acl_obj *acl;
+ struct blob_attr *cur;
+ int rem;
+
+ if (!cl->gid && !cl->gid)
+ return 0;
+
+ acl = avl_find_ge_element(&ubusd_acls, obj, acl, avl);
+ while (acl && !avl_is_last(&ubusd_acls, &acl->avl)) {
+ int diff = ubusd_acl_match_path(obj, acl->avl.key, NULL);
+
+ if (diff)
+ break;
+
+ if (ubusd_acl_match_cred(cl, acl)) {
+ acl = avl_next_element(acl, avl);
+ continue;
+ }
+
+ switch (type) {
+ case UBUS_ACL_PUBLISH:
+ if (acl->publish)
+ return 0;
+ break;
+
+ case UBUS_ACL_SUBSCRIBE:
+ if (acl->subscribe)
+ return 0;
+ break;
+
+ case UBUS_ACL_ACCESS:
+ if (acl->methods)
+ blobmsg_for_each_attr(cur, acl->methods, rem)
+ if (blobmsg_type(cur) == BLOBMSG_TYPE_STRING)
+ if (!ubusd_acl_match_path(method, blobmsg_get_string(cur), NULL))
+ return 0;
+ break;
+ }
+ acl = avl_next_element(acl, avl);
+ }
+
+ return -1;
+}
+
+int
+ubusd_acl_init_client(struct ubus_client *cl, int fd)
+{
+ unsigned int len = sizeof(struct ucred);
+ struct ucred cred;
+ struct passwd *pwd;
+ struct group *group;
+
+ if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cred, &len) == -1)
+ return -1;
+
+ pwd = getpwuid(cred.uid);
+ if (!pwd)
+ return -1;
+
+ group = getgrgid(cred.gid);
+ if (!group)
+ return -1;
+
+ cl->uid = cred.uid;
+ cl->gid = cred.gid;
+
+ cl->group = strdup(group->gr_name);
+ cl->user = strdup(pwd->pw_name);
+
+ return 0;
+}
+
+static void
+ubusd_acl_file_free(struct ubusd_acl_file *file)
+{
+ struct ubusd_acl_obj *p, *q;
+
+ list_for_each_entry_safe(p, q, &file->acl, list) {
+ avl_delete(&ubusd_acls, &p->avl);
+ list_del(&p->list);
+ free(p);
+ }
+
+ free(file);
+}
+
+enum {
+ ACL_ACCESS_METHODS,
+ ACL_ACCESS_TAGS,
+ ACL_ACCESS_PRIV,
+ __ACL_ACCESS_MAX
+};
+
+static const struct blobmsg_policy acl_obj_policy[__ACL_ACCESS_MAX] = {
+ [ACL_ACCESS_METHODS] = { .name = "methods", .type = BLOBMSG_TYPE_ARRAY },
+ [ACL_ACCESS_TAGS] = { .name = "tags", .type = BLOBMSG_TYPE_ARRAY },
+ [ACL_ACCESS_PRIV] = { .name = "acl", .type = BLOBMSG_TYPE_TABLE },
+};
+
+static struct ubusd_acl_obj*
+ubusd_acl_alloc_obj(struct ubusd_acl_file *file, const char *obj)
+{
+ struct ubusd_acl_obj *o;
+ char *k;
+
+ o = calloc_a(1, sizeof(*o), &k, strlen(obj) + 1);
+ o->user = file->user;
+ o->group = file->group;
+ o->avl.key = k;
+ strcpy(k, obj);
+
+ while (*k) {
+ if (*k == '*')
+ *k = '\t';
+ k++;
+ }
+
+ list_add(&o->list, &file->acl);
+ avl_insert(&ubusd_acls, &o->avl);
+
+ return o;
+}
+
+static void
+ubusd_acl_add_access(struct ubusd_acl_file *file, struct blob_attr *obj)
+{
+ struct blob_attr *tb[__ACL_ACCESS_MAX];
+ struct ubusd_acl_obj *o;
+
+ blobmsg_parse(acl_obj_policy, __ACL_ACCESS_MAX, tb, blobmsg_data(obj),
+ blobmsg_data_len(obj));
+
+ if (!tb[ACL_ACCESS_METHODS] && !tb[ACL_ACCESS_TAGS] && !tb[ACL_ACCESS_PRIV])
+ return;
+
+ o = ubusd_acl_alloc_obj(file, blobmsg_name(obj));
+
+ o->methods = tb[ACL_ACCESS_METHODS];
+ o->tags = tb[ACL_ACCESS_TAGS];
+ o->priv = tb[ACL_ACCESS_PRIV];
+
+ if (file->user || file->group)
+ file->ok = 1;
+}
+
+static void
+ubusd_acl_add_subscribe(struct ubusd_acl_file *file, const char *obj)
+{
+ struct ubusd_acl_obj *o = ubusd_acl_alloc_obj(file, obj);
+
+ o->subscribe = true;
+}
+
+static void
+ubusd_acl_add_publish(struct ubusd_acl_file *file, const char *obj)
+{
+ struct ubusd_acl_obj *o = ubusd_acl_alloc_obj(file, obj);
+
+ o->publish = true;
+}
+
+enum {
+ ACL_USER,
+ ACL_GROUP,
+ ACL_ACCESS,
+ ACL_PUBLISH,
+ ACL_SUBSCRIBE,
+ ACL_INHERIT,
+ __ACL_MAX
+};
+
+static const struct blobmsg_policy acl_policy[__ACL_MAX] = {
+ [ACL_USER] = { .name = "user", .type = BLOBMSG_TYPE_STRING },
+ [ACL_GROUP] = { .name = "group", .type = BLOBMSG_TYPE_STRING },
+ [ACL_ACCESS] = { .name = "access", .type = BLOBMSG_TYPE_TABLE },
+ [ACL_PUBLISH] = { .name = "publish", .type = BLOBMSG_TYPE_ARRAY },
+ [ACL_SUBSCRIBE] = { .name = "subscribe", .type = BLOBMSG_TYPE_ARRAY },
+ [ACL_INHERIT] = { .name = "inherit", .type = BLOBMSG_TYPE_ARRAY },
+};
+
+static void
+ubusd_acl_file_add(struct ubusd_acl_file *file)
+{
+ struct blob_attr *tb[__ACL_MAX], *cur;
+ int rem;
+
+ blobmsg_parse(acl_policy, __ACL_MAX, tb, blob_data(file->blob),
+ blob_len(file->blob));
+
+ if (tb[ACL_USER])
+ file->user = blobmsg_get_string(tb[ACL_USER]);
+ else if (tb[ACL_GROUP])
+ file->group = blobmsg_get_string(tb[ACL_GROUP]);
+ else
+ return;
+
+ if (!tb[ACL_ACCESS] && !tb[ACL_PUBLISH] && !tb[ACL_INHERIT])
+ return;
+
+ if (tb[ACL_ACCESS])
+ blobmsg_for_each_attr(cur, tb[ACL_ACCESS], rem)
+ ubusd_acl_add_access(file, cur);
+
+ if (tb[ACL_SUBSCRIBE])
+ blobmsg_for_each_attr(cur, tb[ACL_SUBSCRIBE], rem)
+ if (blobmsg_type(cur) == BLOBMSG_TYPE_STRING)
+ ubusd_acl_add_subscribe(file, blobmsg_get_string(cur));
+
+ if (tb[ACL_PUBLISH])
+ blobmsg_for_each_attr(cur, tb[ACL_PUBLISH], rem)
+ if (blobmsg_type(cur) == BLOBMSG_TYPE_STRING)
+ ubusd_acl_add_publish(file, blobmsg_get_string(cur));
+}
+
+static void
+ubusd_acl_update_cb(struct vlist_tree *tree, struct vlist_node *node_new,
+ struct vlist_node *node_old)
+{
+ struct ubusd_acl_file *file;
+
+ if (node_old) {
+ file = container_of(node_old, struct ubusd_acl_file, avl);
+ ubusd_acl_file_free(file);
+ }
+
+ if (node_new) {
+ file = container_of(node_new, struct ubusd_acl_file, avl);
+ ubusd_acl_file_add(file);
+ }
+}
+
+static struct ubus_msg_buf *
+ubusd_create_sequence_event_msg(void *priv, const char *id)
+{
+ void *s;
+
+ blob_buf_init(&b, 0);
+ blob_put_int32(&b, UBUS_ATTR_OBJID, 0);
+ blob_put_string(&b, UBUS_ATTR_METHOD, id);
+ s = blob_nest_start(&b, UBUS_ATTR_DATA);
+ blobmsg_add_u32(&b, "sequence", ubusd_acl_seq);
+ blob_nest_end(&b, s);
+
+ return ubus_msg_new(b.head, blob_raw_len(b.head), true);
+}
+
+static VLIST_TREE(ubusd_acl_files, avl_strcmp, ubusd_acl_update_cb, false, false);
+
+static int
+ubusd_acl_load_file(const char *filename)
+{
+ struct ubusd_acl_file *file;
+ void *blob;
+
+ blob_buf_init(&bbuf, 0);
+ if (!blobmsg_add_json_from_file(&bbuf, filename)) {
+ syslog(LOG_ERR, "failed to parse %s\n", filename);
+ return -1;
+ }
+
+ file = calloc_a(sizeof(*file), &blob, blob_raw_len(bbuf.head));
+ if (!file)
+ return -1;
+
+ file->blob = blob;
+
+ memcpy(blob, bbuf.head, blob_raw_len(bbuf.head));
+ INIT_LIST_HEAD(&file->acl);
+
+ vlist_add(&ubusd_acl_files, &file->avl, filename);
+ syslog(LOG_INFO, "loading %s\n", filename);
+
+ return 0;
+}
+
+void
+ubusd_acl_load(void)
+{
+ struct stat st;
+ glob_t gl;
+ int j;
+
+ if (glob("/usr/share/acl.d/*.json", GLOB_NOESCAPE | GLOB_MARK, NULL, &gl))
+ return;
+
+ vlist_update(&ubusd_acl_files);
+ for (j = 0; j < gl.gl_pathc; j++) {
+ if (stat(gl.gl_pathv[j], &st) || !S_ISREG(st.st_mode))
+ continue;
+
+ if (st.st_uid || st.st_gid) {
+ syslog(LOG_ERR, "%s has wrong owner\n", gl.gl_pathv[j]);
+ continue;
+ }
+ if (st.st_mode & (S_IWOTH | S_IWGRP | S_IXOTH)) {
+ syslog(LOG_ERR, "%s has wrong permissions\n", gl.gl_pathv[j]);
+ continue;
+ }
+ ubusd_acl_load_file(gl.gl_pathv[j]);
+ }
+
+ globfree(&gl);
+ vlist_flush(&ubusd_acl_files);
+ ubusd_acl_seq++;
+ ubusd_send_event(NULL, "ubus.acl.sequence", ubusd_create_sequence_event_msg, NULL);
+}
+
+static void
+ubusd_reply_add(struct ubus_object *obj)
+{
+ struct ubusd_acl_obj *acl;
+
+ if (!obj->path.key)
+ return;
+ acl = avl_find_ge_element(&ubusd_acls, obj->path.key, acl, avl);
+ while (acl && !avl_is_last(&ubusd_acls, &acl->avl) &&
+ !ubusd_acl_match_path(obj->path.key, acl->avl.key, NULL)) {
+
+ if (acl->priv) {
+ void *c = blobmsg_open_table(&b, NULL);
+
+ blobmsg_add_string(&b, "obj", obj->path.key);
+ if (acl->user)
+ blobmsg_add_string(&b, "user", acl->user);
+ if (acl->group)
+ blobmsg_add_string(&b, "group", acl->group);
+
+ if (acl->priv)
+ blobmsg_add_field(&b, blobmsg_type(acl->priv), "acl",
+ blobmsg_data(acl->priv), blobmsg_data_len(acl->priv));
+
+ blobmsg_close_table(&b, c);
+ }
+ acl = avl_next_element(acl, avl);
+ }
+}
+static int ubusd_reply_query(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr, struct blob_attr *msg)
+{
+ struct ubus_object *obj;
+ void *d, *a;
+
+ if (!attr[UBUS_ATTR_OBJID])
+ return UBUS_STATUS_INVALID_ARGUMENT;
+
+ obj = ubusd_find_object(blob_get_u32(attr[UBUS_ATTR_OBJID]));
+ if (!obj)
+ return UBUS_STATUS_NOT_FOUND;
+
+ blob_buf_init(&b, 0);
+ blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
+ d = blob_nest_start(&b, UBUS_ATTR_DATA);
+
+ blobmsg_add_u32(&b, "seq", ubusd_acl_seq);
+ a = blobmsg_open_array(&b, "acl");
+ list_for_each_entry(obj, &cl->objects, list)
+ ubusd_reply_add(obj);
+ blobmsg_close_table(&b, a);
+
+ blob_nest_end(&b, d);
+
+ ubus_proto_send_msg_from_blob(cl, ub, UBUS_MSG_DATA);
+
+ return 0;
+}
+
+static int ubusd_acl_recv(struct ubus_client *cl, struct ubus_msg_buf *ub, const char *method, struct blob_attr *msg)
+{
+ if (!strcmp(method, "query"))
+ return ubusd_reply_query(cl, ub, ubus_parse_msg(ub->data), msg);
+
+ return UBUS_STATUS_INVALID_COMMAND;
+}
+
+void ubusd_acl_init(void)
+{
+ avl_init(&ubusd_acls, ubusd_acl_match_path, true, NULL);
+ acl_obj = ubusd_create_object_internal(NULL, UBUS_SYSTEM_OBJECT_ACL);
+ acl_obj->recv_msg = ubusd_acl_recv;
+}
projects / oweals / ubus.git / commitdiff