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Most trusted OSs, with the exception of Linux, have the ability to specify static security labels for unlabeled networks. This patch adds this ability to the NetLabel packet labeling framework. If the NetLabel subsystem is called to determine the security attributes of an incoming packet it first checks to see if any recognized NetLabel packet labeling protocols are in-use on the packet. If none can be found then the unlabled connection table is queried and based on the packets incoming interface and address it is matched with a security label as configured by the administrator using the netlabel_tools package. The matching security label is returned to the caller just as if the packet was explicitly labeled using a labeling protocol. Signed-off-by: Paul Moore <paul.moore@hp.com> Signed-off-by: James Morris <jmorris@namei.org>
233 lines
6.6 KiB
C
233 lines
6.6 KiB
C
/*
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* NetLabel Unlabeled Support
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*
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* This file defines functions for dealing with unlabeled packets for the
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* NetLabel system. The NetLabel system manages static and dynamic label
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* mappings for network 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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#ifndef _NETLABEL_UNLABELED_H
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#define _NETLABEL_UNLABELED_H
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#include <net/netlabel.h>
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/*
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* The following NetLabel payloads are supported by the Unlabeled subsystem.
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*
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* o STATICADD
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* This message is sent from an application to add a new static label for
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* incoming unlabeled connections.
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*
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* Required attributes:
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*
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* NLBL_UNLABEL_A_IFACE
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* NLBL_UNLABEL_A_SECCTX
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*
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* If IPv4 is specified the following attributes are required:
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*
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* NLBL_UNLABEL_A_IPV4ADDR
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* NLBL_UNLABEL_A_IPV4MASK
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*
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* If IPv6 is specified the following attributes are required:
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*
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* NLBL_UNLABEL_A_IPV6ADDR
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* NLBL_UNLABEL_A_IPV6MASK
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*
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* o STATICREMOVE
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* This message is sent from an application to remove an existing static
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* label for incoming unlabeled connections.
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*
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* Required attributes:
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*
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* NLBL_UNLABEL_A_IFACE
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*
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* If IPv4 is specified the following attributes are required:
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*
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* NLBL_UNLABEL_A_IPV4ADDR
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* NLBL_UNLABEL_A_IPV4MASK
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*
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* If IPv6 is specified the following attributes are required:
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*
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* NLBL_UNLABEL_A_IPV6ADDR
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* NLBL_UNLABEL_A_IPV6MASK
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*
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* o STATICLIST
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* This message can be sent either from an application or by the kernel in
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* response to an application generated STATICLIST message. When sent by an
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* application there is no payload and the NLM_F_DUMP flag should be set.
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* The kernel should response with a series of the following messages.
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*
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* Required attributes:
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*
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* NLBL_UNLABEL_A_IFACE
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* NLBL_UNLABEL_A_SECCTX
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*
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* If IPv4 is specified the following attributes are required:
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*
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* NLBL_UNLABEL_A_IPV4ADDR
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* NLBL_UNLABEL_A_IPV4MASK
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*
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* If IPv6 is specified the following attributes are required:
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*
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* NLBL_UNLABEL_A_IPV6ADDR
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* NLBL_UNLABEL_A_IPV6MASK
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*
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* o STATICADDDEF
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* This message is sent from an application to set the default static
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* label for incoming unlabeled connections.
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*
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* Required attribute:
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*
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* NLBL_UNLABEL_A_SECCTX
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*
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* If IPv4 is specified the following attributes are required:
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*
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* NLBL_UNLABEL_A_IPV4ADDR
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* NLBL_UNLABEL_A_IPV4MASK
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*
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* If IPv6 is specified the following attributes are required:
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*
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* NLBL_UNLABEL_A_IPV6ADDR
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* NLBL_UNLABEL_A_IPV6MASK
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*
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* o STATICREMOVEDEF
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* This message is sent from an application to remove the existing default
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* static label for incoming unlabeled connections.
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*
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* If IPv4 is specified the following attributes are required:
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*
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* NLBL_UNLABEL_A_IPV4ADDR
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* NLBL_UNLABEL_A_IPV4MASK
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*
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* If IPv6 is specified the following attributes are required:
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*
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* NLBL_UNLABEL_A_IPV6ADDR
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* NLBL_UNLABEL_A_IPV6MASK
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*
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* o STATICLISTDEF
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* This message can be sent either from an application or by the kernel in
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* response to an application generated STATICLISTDEF message. When sent by
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* an application there is no payload and the NLM_F_DUMP flag should be set.
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* The kernel should response with the following message.
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*
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* Required attribute:
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*
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* NLBL_UNLABEL_A_SECCTX
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*
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* If IPv4 is specified the following attributes are required:
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*
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* NLBL_UNLABEL_A_IPV4ADDR
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* NLBL_UNLABEL_A_IPV4MASK
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*
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* If IPv6 is specified the following attributes are required:
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*
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* NLBL_UNLABEL_A_IPV6ADDR
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* NLBL_UNLABEL_A_IPV6MASK
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*
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* o ACCEPT
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* This message is sent from an application to specify if the kernel should
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* allow unlabled packets to pass if they do not match any of the static
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* mappings defined in the unlabeled module.
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*
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* Required attributes:
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*
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* NLBL_UNLABEL_A_ACPTFLG
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*
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* o LIST
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* This message can be sent either from an application or by the kernel in
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* response to an application generated LIST message. When sent by an
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* application there is no payload. The kernel should respond to a LIST
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* message with a LIST message on success.
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*
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* Required attributes:
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*
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* NLBL_UNLABEL_A_ACPTFLG
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*
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*/
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/* NetLabel Unlabeled commands */
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enum {
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NLBL_UNLABEL_C_UNSPEC,
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NLBL_UNLABEL_C_ACCEPT,
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NLBL_UNLABEL_C_LIST,
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NLBL_UNLABEL_C_STATICADD,
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NLBL_UNLABEL_C_STATICREMOVE,
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NLBL_UNLABEL_C_STATICLIST,
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NLBL_UNLABEL_C_STATICADDDEF,
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NLBL_UNLABEL_C_STATICREMOVEDEF,
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NLBL_UNLABEL_C_STATICLISTDEF,
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__NLBL_UNLABEL_C_MAX,
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};
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#define NLBL_UNLABEL_C_MAX (__NLBL_UNLABEL_C_MAX - 1)
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/* NetLabel Unlabeled attributes */
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enum {
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NLBL_UNLABEL_A_UNSPEC,
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NLBL_UNLABEL_A_ACPTFLG,
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/* (NLA_U8)
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* if true then unlabeled packets are allowed to pass, else unlabeled
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* packets are rejected */
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NLBL_UNLABEL_A_IPV6ADDR,
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/* (NLA_BINARY, struct in6_addr)
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* an IPv6 address */
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NLBL_UNLABEL_A_IPV6MASK,
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/* (NLA_BINARY, struct in6_addr)
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* an IPv6 address mask */
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NLBL_UNLABEL_A_IPV4ADDR,
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/* (NLA_BINARY, struct in_addr)
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* an IPv4 address */
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NLBL_UNLABEL_A_IPV4MASK,
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/* (NLA_BINARY, struct in_addr)
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* and IPv4 address mask */
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NLBL_UNLABEL_A_IFACE,
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/* (NLA_NULL_STRING)
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* network interface */
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NLBL_UNLABEL_A_SECCTX,
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/* (NLA_BINARY)
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* a LSM specific security context */
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__NLBL_UNLABEL_A_MAX,
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};
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#define NLBL_UNLABEL_A_MAX (__NLBL_UNLABEL_A_MAX - 1)
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/* NetLabel protocol functions */
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int netlbl_unlabel_genl_init(void);
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/* Unlabeled connection hash table size */
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/* XXX - currently this number is an uneducated guess */
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#define NETLBL_UNLHSH_BITSIZE 7
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/* General Unlabeled init function */
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int netlbl_unlabel_init(u32 size);
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/* Process Unlabeled incoming network packets */
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int netlbl_unlabel_getattr(const struct sk_buff *skb,
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u16 family,
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struct netlbl_lsm_secattr *secattr);
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/* Set the default configuration to allow Unlabeled packets */
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int netlbl_unlabel_defconf(void);
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#endif
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