168 lines
4.2 KiB
C
168 lines
4.2 KiB
C
/*
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* NetLabel NETLINK Interface
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*
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* This file defines the NETLINK interface for the NetLabel system. The
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* NetLabel system manages static and dynamic label mappings for network
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* protocols such as CIPSO and RIPSO.
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*
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* Author: Paul Moore <paul.moore@hp.com>
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*
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*/
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/*
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* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/socket.h>
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#include <linux/audit.h>
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#include <linux/tty.h>
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#include <linux/security.h>
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#include <net/sock.h>
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#include <net/netlink.h>
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#include <net/genetlink.h>
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#include <net/netlabel.h>
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#include <asm/bug.h>
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#include "netlabel_mgmt.h"
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#include "netlabel_unlabeled.h"
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#include "netlabel_cipso_v4.h"
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#include "netlabel_user.h"
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/*
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* NetLabel NETLINK Setup Functions
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*/
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/**
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* netlbl_netlink_init - Initialize the NETLINK communication channel
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*
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* Description:
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* Call out to the NetLabel components so they can register their families and
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* commands with the Generic NETLINK mechanism. Returns zero on success and
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* non-zero on failure.
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*
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*/
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int netlbl_netlink_init(void)
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{
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int ret_val;
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ret_val = netlbl_mgmt_genl_init();
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if (ret_val != 0)
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return ret_val;
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ret_val = netlbl_cipsov4_genl_init();
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if (ret_val != 0)
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return ret_val;
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ret_val = netlbl_unlabel_genl_init();
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if (ret_val != 0)
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return ret_val;
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return 0;
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}
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/*
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* NetLabel Audit Functions
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*/
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/**
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* netlbl_audit_start_common - Start an audit message
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* @type: audit message type
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* @secid: LSM context ID
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*
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* Description:
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* Start an audit message using the type specified in @type and fill the audit
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* message with some fields common to all NetLabel audit messages. Returns
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* a pointer to the audit buffer on success, NULL on failure.
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*
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*/
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struct audit_buffer *netlbl_audit_start_common(int type, u32 secid)
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{
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struct audit_context *audit_ctx = current->audit_context;
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struct audit_buffer *audit_buf;
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uid_t audit_loginuid;
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const char *audit_tty;
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char audit_comm[sizeof(current->comm)];
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struct vm_area_struct *vma;
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char *secctx;
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u32 secctx_len;
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audit_buf = audit_log_start(audit_ctx, GFP_ATOMIC, type);
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if (audit_buf == NULL)
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return NULL;
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audit_loginuid = audit_get_loginuid(audit_ctx);
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if (current->signal &&
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current->signal->tty &&
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current->signal->tty->name)
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audit_tty = current->signal->tty->name;
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else
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audit_tty = "(none)";
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get_task_comm(audit_comm, current);
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audit_log_format(audit_buf,
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"netlabel: auid=%u uid=%u tty=%s pid=%d",
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audit_loginuid,
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current->uid,
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audit_tty,
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current->pid);
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audit_log_format(audit_buf, " comm=");
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audit_log_untrustedstring(audit_buf, audit_comm);
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if (current->mm) {
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down_read(¤t->mm->mmap_sem);
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vma = current->mm->mmap;
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while (vma) {
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if ((vma->vm_flags & VM_EXECUTABLE) &&
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vma->vm_file) {
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audit_log_d_path(audit_buf,
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" exe=",
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vma->vm_file->f_dentry,
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vma->vm_file->f_vfsmnt);
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break;
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}
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vma = vma->vm_next;
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}
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up_read(¤t->mm->mmap_sem);
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}
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if (secid != 0 &&
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security_secid_to_secctx(secid, &secctx, &secctx_len) == 0)
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audit_log_format(audit_buf, " subj=%s", secctx);
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return audit_buf;
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}
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/**
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* netlbl_audit_nomsg - Send an audit message without additional text
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* @type: audit message type
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* @secid: LSM context ID
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*
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* Description:
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* Send an audit message with only the common NetLabel audit fields.
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*
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*/
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void netlbl_audit_nomsg(int type, u32 secid)
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{
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struct audit_buffer *audit_buf;
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audit_buf = netlbl_audit_start_common(type, secid);
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audit_log_end(audit_buf);
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}
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