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 /*
  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 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         ret_val = netlbl_unlabel_genl_init();
  75         if (ret_val != 0)
  76                 return ret_val;
  77
  78         return 0;
  79 }
  80
  81 /*
  82  * NetLabel Audit Functions
  83  */
  84
  85 /**
  86  * netlbl_audit_start_common - Start an audit message
  87  * @type: audit message type
  88  * @secid: LSM context ID
  89  *
  90  * Description:
  91  * Start an audit message using the type specified in @type and fill the audit
  92  * message with some fields common to all NetLabel audit messages.  Returns
  93  * a pointer to the audit buffer on success, NULL on failure.
  94  *
  95  */
  96 struct audit_buffer *netlbl_audit_start_common(int type, u32 secid)
  97 {
  98         struct audit_context *audit_ctx = current->audit_context;
  99         struct audit_buffer *audit_buf;
 100         uid_t audit_loginuid;
 101         const char *audit_tty;
 102         char audit_comm[sizeof(current->comm)];
 103         struct vm_area_struct *vma;
 104         char *secctx;
 105         u32 secctx_len;
 106
 107         audit_buf = audit_log_start(audit_ctx, GFP_ATOMIC, type);
 108         if (audit_buf == NULL)
 109                 return NULL;
 110
 111         audit_loginuid = audit_get_loginuid(audit_ctx);
 112         if (current->signal &&
 113             current->signal->tty &&
 114             current->signal->tty->name)
 115                 audit_tty = current->signal->tty->name;
 116         else
 117                 audit_tty = "(none)";
 118         get_task_comm(audit_comm, current);
 119
 120         audit_log_format(audit_buf,
 121                          "netlabel: auid=%u uid=%u tty=%s pid=%d",
 122                          audit_loginuid,
 123                          current->uid,
 124                          audit_tty,
 125                          current->pid);
 126         audit_log_format(audit_buf, " comm=");
 127         audit_log_untrustedstring(audit_buf, audit_comm);
 128         if (current->mm) {
 129                 down_read(&current->mm->mmap_sem);
 130                 vma = current->mm->mmap;
 131                 while (vma) {
 132                         if ((vma->vm_flags & VM_EXECUTABLE) &&
 133                             vma->vm_file) {
 134                                 audit_log_d_path(audit_buf,
 135                                                  " exe=",
 136                                                  vma->vm_file->f_dentry,
 137                                                  vma->vm_file->f_vfsmnt);
 138                                 break;
 139                         }
 140                         vma = vma->vm_next;
 141                 }
 142                 up_read(&current->mm->mmap_sem);
 143         }
 144
 145         if (secid != 0 &&
 146             security_secid_to_secctx(secid, &secctx, &secctx_len) == 0)
 147                 audit_log_format(audit_buf, " subj=%s", secctx);
 148
 149         return audit_buf;
 150 }
 151
 152 /**
 153  * netlbl_audit_nomsg - Send an audit message without additional text
 154  * @type: audit message type
 155  * @secid: LSM context ID
 156  *
 157  * Description:
 158  * Send an audit message with only the common NetLabel audit fields.
 159  *
 160  */
 161 void netlbl_audit_nomsg(int type, u32 secid)
 162 {
 163         struct audit_buffer *audit_buf;
 164
 165         audit_buf = netlbl_audit_start_common(type, secid);
 166         audit_log_end(audit_buf);
 167 }