scal/acl.c at master · prplfoundation/scal · GitHub

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/*
 * Copyright (C) 2016 prpl Foundation
 * Written by Felix Fietkau <nbd@nbd.name>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include "scapi.h"
#include "scald.h"

static struct ubus_request_data *ubus_req;
static const char *ubus_method;

static struct ubus_method acl_object_methods[] = {};

static struct ubus_object_type acl_object_type =
	UBUS_OBJECT_TYPE("scald.acl", acl_object_methods);

static struct ubus_object acl_object = {
	.type = &acl_object_type,
	.methods = acl_object_methods,
	.n_methods = ARRAY_SIZE(acl_object_methods),
};

void
scald_acl_req_init(struct ubus_request_data *req, const char *method)
{
	ubus_req = req;
	ubus_method = method;
}

void
scald_acl_req_done(void)
{
	ubus_req = NULL;
	ubus_method = NULL;
}

struct ubus_event_req {
	struct ubus_notify_request req;
	bool deny;
};

static void
acl_event_cb(struct ubus_notify_request *req, int idx, int ret)
{
	struct ubus_event_req *ureq = container_of(req, struct ubus_event_req, req);

	if (ret)
		ureq->deny = true;
}

int
scald_acl_req_check(struct scapi_ptr *ptr, enum scapi_ptr_type type)
{
	struct ubus_event_req ureq = {};
	struct blob_buf *buf;
	void *c;

	buf = scald_event_new(&acl_object);
	if (!buf)
		return 0;

	blobmsg_add_string(buf, "method", ubus_method);

	c = blobmsg_open_table(buf, "ubus");
	if (ubus_req->acl.user)
		blobmsg_add_string(buf, "user", ubus_req->acl.user);
	if (ubus_req->acl.group)
		blobmsg_add_string(buf, "group", ubus_req->acl.group);
	blobmsg_close_array(buf, c);

	scald_event_add_ptr(buf, ptr, type);

	if (ubus_notify_async(ubus_ctx, &acl_object, "check", buf->head, &ureq.req))
		return 0;

	ureq.req.status_cb = acl_event_cb;
	ubus_complete_request(ubus_ctx, &ureq.req.req, 1000);

	if (ureq.deny)
		return SC_ERR_ACCESS_DENIED;

	return 0;
}

void scald_acl_init(struct ubus_context *ctx)
{
	char *name;

	name = malloc(strlen(ubus_prefix) + 5);
	if (!name)
		return;

	sprintf(name, "%s.acl", ubus_prefix);
	acl_object.name = name;
	ubus_add_object(ctx, &acl_object);
}