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/net/netlabel/netlabel_user.c

http://github.com/mirrors/linux
C | 110 lines | 55 code | 16 blank | 39 comment | 13 complexity | 90ca481278ce3a3a2e3304a52e1d0dca MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * NetLabel NETLINK Interface
  4 *
  5 * This file defines the NETLINK interface for the NetLabel system.  The
  6 * NetLabel system manages static and dynamic label mappings for network
  7 * protocols such as CIPSO and RIPSO.
  8 *
  9 * Author: Paul Moore <paul@paul-moore.com>
 10 */
 11
 12/*
 13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
 14 */
 15
 16#include <linux/init.h>
 17#include <linux/types.h>
 18#include <linux/list.h>
 19#include <linux/socket.h>
 20#include <linux/audit.h>
 21#include <linux/tty.h>
 22#include <linux/security.h>
 23#include <linux/gfp.h>
 24#include <net/sock.h>
 25#include <net/netlink.h>
 26#include <net/genetlink.h>
 27#include <net/netlabel.h>
 28#include <asm/bug.h>
 29
 30#include "netlabel_mgmt.h"
 31#include "netlabel_unlabeled.h"
 32#include "netlabel_cipso_v4.h"
 33#include "netlabel_calipso.h"
 34#include "netlabel_user.h"
 35
 36/*
 37 * NetLabel NETLINK Setup Functions
 38 */
 39
 40/**
 41 * netlbl_netlink_init - Initialize the NETLINK communication channel
 42 *
 43 * Description:
 44 * Call out to the NetLabel components so they can register their families and
 45 * commands with the Generic NETLINK mechanism.  Returns zero on success and
 46 * non-zero on failure.
 47 *
 48 */
 49int __init netlbl_netlink_init(void)
 50{
 51	int ret_val;
 52
 53	ret_val = netlbl_mgmt_genl_init();
 54	if (ret_val != 0)
 55		return ret_val;
 56
 57	ret_val = netlbl_cipsov4_genl_init();
 58	if (ret_val != 0)
 59		return ret_val;
 60
 61	ret_val = netlbl_calipso_genl_init();
 62	if (ret_val != 0)
 63		return ret_val;
 64
 65	return netlbl_unlabel_genl_init();
 66}
 67
 68/*
 69 * NetLabel Audit Functions
 70 */
 71
 72/**
 73 * netlbl_audit_start_common - Start an audit message
 74 * @type: audit message type
 75 * @audit_info: NetLabel audit information
 76 *
 77 * Description:
 78 * Start an audit message using the type specified in @type and fill the audit
 79 * message with some fields common to all NetLabel audit messages.  Returns
 80 * a pointer to the audit buffer on success, NULL on failure.
 81 *
 82 */
 83struct audit_buffer *netlbl_audit_start_common(int type,
 84					       struct netlbl_audit *audit_info)
 85{
 86	struct audit_buffer *audit_buf;
 87	char *secctx;
 88	u32 secctx_len;
 89
 90	if (audit_enabled == AUDIT_OFF)
 91		return NULL;
 92
 93	audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, type);
 94	if (audit_buf == NULL)
 95		return NULL;
 96
 97	audit_log_format(audit_buf, "netlabel: auid=%u ses=%u",
 98			 from_kuid(&init_user_ns, audit_info->loginuid),
 99			 audit_info->sessionid);
100
101	if (audit_info->secid != 0 &&
102	    security_secid_to_secctx(audit_info->secid,
103				     &secctx,
104				     &secctx_len) == 0) {
105		audit_log_format(audit_buf, " subj=%s", secctx);
106		security_release_secctx(secctx, secctx_len);
107	}
108
109	return audit_buf;
110}