LXR linux/net/netlabel/netlabel

   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}
 111