net/netlabel/netlabel_user.c

   1 /*
   2  * NetLabel NETLINK Interface
   3  *
   4  * This file defines the NETLINK interface for the NetLabel system.  The
   5  * NetLabel system manages static and dynamic label mappings for network
   6  * protocols such as CIPSO and RIPSO.
   7  *
   8  * Author: Paul Moore <paul@paul-moore.com>
   9  *
  10  */
  11
  12 /*
  13  * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
  14  *
  15  * This program is free software;  you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY;  without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  23  * the GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program;  if not, see <http://www.gnu.org/licenses/>.
  27  *
  28  */
  29
  30 #include <linux/init.h>
  31 #include <linux/types.h>
  32 #include <linux/list.h>
  33 #include <linux/socket.h>
  34 #include <linux/audit.h>
  35 #include <linux/tty.h>
  36 #include <linux/security.h>
  37 #include <linux/gfp.h>
  38 #include <net/sock.h>
  39 #include <net/netlink.h>
  40 #include <net/genetlink.h>
  41 #include <net/netlabel.h>
  42 #include <asm/bug.h>
  43
  44 #include "netlabel_mgmt.h"
  45 #include "netlabel_unlabeled.h"
  46 #include "netlabel_cipso_v4.h"
  47 #include "netlabel_user.h"
  48
  49 /*
  50  * NetLabel NETLINK Setup Functions
  51  */
  52
  53 /**
  54  * netlbl_netlink_init - Initialize the NETLINK communication channel
  55  *
  56  * Description:
  57  * Call out to the NetLabel components so they can register their families and
  58  * commands with the Generic NETLINK mechanism.  Returns zero on success and
  59  * non-zero on failure.
  60  *
  61  */
  62 int __init netlbl_netlink_init(void)
  63 {
  64         int ret_val;
  65
  66         ret_val = netlbl_mgmt_genl_init();
  67         if (ret_val != 0)
  68                 return ret_val;
  69
  70         ret_val = netlbl_cipsov4_genl_init();
  71         if (ret_val != 0)
  72                 return ret_val;
  73
  74         return netlbl_unlabel_genl_init();
  75 }
  76
  77 /*
  78  * NetLabel Audit Functions
  79  */
  80
  81 /**
  82  * netlbl_audit_start_common - Start an audit message
  83  * @type: audit message type
  84  * @audit_info: NetLabel audit information
  85  *
  86  * Description:
  87  * Start an audit message using the type specified in @type and fill the audit
  88  * message with some fields common to all NetLabel audit messages.  Returns
  89  * a pointer to the audit buffer on success, NULL on failure.
  90  *
  91  */
  92 struct audit_buffer *netlbl_audit_start_common(int type,
  93                                                struct netlbl_audit *audit_info)
  94 {
  95         struct audit_buffer *audit_buf;
  96         char *secctx;
  97         u32 secctx_len;
  98
  99         if (audit_enabled == 0)
 100                 return NULL;
 101
 102         audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type);
 103         if (audit_buf == NULL)
 104                 return NULL;
 105
 106         audit_log_format(audit_buf, "netlabel: auid=%u ses=%u",
 107                          from_kuid(&init_user_ns, audit_info->loginuid),
 108                          audit_info->sessionid);
 109
 110         if (audit_info->secid != 0 &&
 111             security_secid_to_secctx(audit_info->secid,
 112                                      &secctx,
 113                                      &secctx_len) == 0) {
 114                 audit_log_format(audit_buf, " subj=%s", secctx);
 115                 security_release_secctx(secctx, secctx_len);
 116         }
 117
 118         return audit_buf;
 119 }