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.moore@hp.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, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  28  *
  29  */
  30
  31 #include <linux/init.h>
  32 #include <linux/types.h>
  33 #include <linux/list.h>
  34 #include <linux/socket.h>
  35 #include <linux/audit.h>
  36 #include <linux/tty.h>
  37 #include <linux/security.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 /* do not do any auditing if audit_enabled == 0, see kernel/audit.c for
  50  * details */
  51 extern int audit_enabled;
  52
  53 /*
  54  * NetLabel NETLINK Setup Functions
  55  */
  56
  57 /**
  58  * netlbl_netlink_init - Initialize the NETLINK communication channel
  59  *
  60  * Description:
  61  * Call out to the NetLabel components so they can register their families and
  62  * commands with the Generic NETLINK mechanism.  Returns zero on success and
  63  * non-zero on failure.
  64  *
  65  */
  66 int netlbl_netlink_init(void)
  67 {
  68         int ret_val;
  69
  70         ret_val = netlbl_mgmt_genl_init();
  71         if (ret_val != 0)
  72                 return ret_val;
  73
  74         ret_val = netlbl_cipsov4_genl_init();
  75         if (ret_val != 0)
  76                 return ret_val;
  77
  78         ret_val = netlbl_unlabel_genl_init();
  79         if (ret_val != 0)
  80                 return ret_val;
  81
  82         return 0;
  83 }
  84
  85 /*
  86  * NetLabel Audit Functions
  87  */
  88
  89 /**
  90  * netlbl_audit_start_common - Start an audit message
  91  * @type: audit message type
  92  * @audit_info: NetLabel audit information
  93  *
  94  * Description:
  95  * Start an audit message using the type specified in @type and fill the audit
  96  * message with some fields common to all NetLabel audit messages.  Returns
  97  * a pointer to the audit buffer on success, NULL on failure.
  98  *
  99  */
 100 struct audit_buffer *netlbl_audit_start_common(int type,
 101                                                struct netlbl_audit *audit_info)
 102 {
 103         struct audit_context *audit_ctx = current->audit_context;
 104         struct audit_buffer *audit_buf;
 105         char *secctx;
 106         u32 secctx_len;
 107
 108         if (audit_enabled == 0)
 109                 return NULL;
 110
 111         audit_buf = audit_log_start(audit_ctx, GFP_ATOMIC, type);
 112         if (audit_buf == NULL)
 113                 return NULL;
 114
 115         audit_log_format(audit_buf, "netlabel: auid=%u", audit_info->loginuid);
 116
 117         if (audit_info->secid != 0 &&
 118             security_secid_to_secctx(audit_info->secid,
 119                                      &secctx,
 120                                      &secctx_len) == 0)
 121                 audit_log_format(audit_buf, " subj=%s", secctx);
 122
 123         return audit_buf;
 124 }