486 lines
14 KiB
C
486 lines
14 KiB
C
/*
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* NetLabel System
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*
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* The 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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#ifndef _NETLABEL_H
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#define _NETLABEL_H
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#include <linux/types.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <net/netlink.h>
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#include <asm/atomic.h>
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struct cipso_v4_doi;
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/*
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* NetLabel - A management interface for maintaining network packet label
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* mapping tables for explicit packet labling protocols.
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*
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* Network protocols such as CIPSO and RIPSO require a label translation layer
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* to convert the label on the packet into something meaningful on the host
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* machine. In the current Linux implementation these mapping tables live
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* inside the kernel; NetLabel provides a mechanism for user space applications
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* to manage these mapping tables.
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*
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* NetLabel makes use of the Generic NETLINK mechanism as a transport layer to
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* send messages between kernel and user space. The general format of a
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* NetLabel message is shown below:
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*
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* +-----------------+-------------------+--------- --- -- -
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* | struct nlmsghdr | struct genlmsghdr | payload
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* +-----------------+-------------------+--------- --- -- -
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*
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* The 'nlmsghdr' and 'genlmsghdr' structs should be dealt with like normal.
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* The payload is dependent on the subsystem specified in the
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* 'nlmsghdr->nlmsg_type' and should be defined below, supporting functions
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* should be defined in the corresponding net/netlabel/netlabel_<subsys>.h|c
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* file. All of the fields in the NetLabel payload are NETLINK attributes, see
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* the include/net/netlink.h file for more information on NETLINK attributes.
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*
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*/
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/*
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* NetLabel NETLINK protocol
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*/
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/* NetLabel NETLINK protocol version
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* 1: initial version
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* 2: added static labels for unlabeled connections
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*/
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#define NETLBL_PROTO_VERSION 2
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/* NetLabel NETLINK types/families */
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#define NETLBL_NLTYPE_NONE 0
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#define NETLBL_NLTYPE_MGMT 1
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#define NETLBL_NLTYPE_MGMT_NAME "NLBL_MGMT"
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#define NETLBL_NLTYPE_RIPSO 2
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#define NETLBL_NLTYPE_RIPSO_NAME "NLBL_RIPSO"
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#define NETLBL_NLTYPE_CIPSOV4 3
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#define NETLBL_NLTYPE_CIPSOV4_NAME "NLBL_CIPSOv4"
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#define NETLBL_NLTYPE_CIPSOV6 4
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#define NETLBL_NLTYPE_CIPSOV6_NAME "NLBL_CIPSOv6"
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#define NETLBL_NLTYPE_UNLABELED 5
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#define NETLBL_NLTYPE_UNLABELED_NAME "NLBL_UNLBL"
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/*
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* NetLabel - Kernel API for accessing the network packet label mappings.
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*
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* The following functions are provided for use by other kernel modules,
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* specifically kernel LSM modules, to provide a consistent, transparent API
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* for dealing with explicit packet labeling protocols such as CIPSO and
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* RIPSO. The functions defined here are implemented in the
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* net/netlabel/netlabel_kapi.c file.
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*
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*/
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/* NetLabel audit information */
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struct netlbl_audit {
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u32 secid;
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uid_t loginuid;
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u32 sessionid;
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};
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/*
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* LSM security attributes
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*/
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/**
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* struct netlbl_lsm_cache - NetLabel LSM security attribute cache
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* @refcount: atomic reference counter
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* @free: LSM supplied function to free the cache data
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* @data: LSM supplied cache data
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*
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* Description:
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* This structure is provided for LSMs which wish to make use of the NetLabel
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* caching mechanism to store LSM specific data/attributes in the NetLabel
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* cache. If the LSM has to perform a lot of translation from the NetLabel
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* security attributes into it's own internal representation then the cache
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* mechanism can provide a way to eliminate some or all of that translation
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* overhead on a cache hit.
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*
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*/
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struct netlbl_lsm_cache {
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atomic_t refcount;
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void (*free) (const void *data);
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void *data;
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};
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/**
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* struct netlbl_lsm_secattr_catmap - NetLabel LSM secattr category bitmap
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* @startbit: the value of the lowest order bit in the bitmap
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* @bitmap: the category bitmap
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* @next: pointer to the next bitmap "node" or NULL
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*
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* Description:
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* This structure is used to represent category bitmaps. Due to the large
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* number of categories supported by most labeling protocols it is not
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* practical to transfer a full bitmap internally so NetLabel adopts a sparse
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* bitmap structure modeled after SELinux's ebitmap structure.
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* The catmap bitmap field MUST be a power of two in length and large
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* enough to hold at least 240 bits. Special care (i.e. check the code!)
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* should be used when changing these values as the LSM implementation
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* probably has functions which rely on the sizes of these types to speed
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* processing.
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*
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*/
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#define NETLBL_CATMAP_MAPTYPE u64
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#define NETLBL_CATMAP_MAPCNT 4
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#define NETLBL_CATMAP_MAPSIZE (sizeof(NETLBL_CATMAP_MAPTYPE) * 8)
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#define NETLBL_CATMAP_SIZE (NETLBL_CATMAP_MAPSIZE * \
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NETLBL_CATMAP_MAPCNT)
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#define NETLBL_CATMAP_BIT (NETLBL_CATMAP_MAPTYPE)0x01
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struct netlbl_lsm_secattr_catmap {
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u32 startbit;
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NETLBL_CATMAP_MAPTYPE bitmap[NETLBL_CATMAP_MAPCNT];
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struct netlbl_lsm_secattr_catmap *next;
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};
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/**
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* struct netlbl_lsm_secattr - NetLabel LSM security attributes
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* @flags: indicate structure attributes, see NETLBL_SECATTR_*
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* @type: indicate the NLTYPE of the attributes
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* @domain: the NetLabel LSM domain
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* @cache: NetLabel LSM specific cache
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* @attr.mls: MLS sensitivity label
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* @attr.mls.cat: MLS category bitmap
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* @attr.mls.lvl: MLS sensitivity level
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* @attr.secid: LSM specific secid token
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*
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* Description:
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* This structure is used to pass security attributes between NetLabel and the
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* LSM modules. The flags field is used to specify which fields within the
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* struct are valid and valid values can be created by bitwise OR'ing the
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* NETLBL_SECATTR_* defines. The domain field is typically set by the LSM to
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* specify domain specific configuration settings and is not usually used by
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* NetLabel itself when returning security attributes to the LSM.
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*
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*/
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struct netlbl_lsm_secattr {
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u32 flags;
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/* bitmap values for 'flags' */
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#define NETLBL_SECATTR_NONE 0x00000000
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#define NETLBL_SECATTR_DOMAIN 0x00000001
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#define NETLBL_SECATTR_DOMAIN_CPY (NETLBL_SECATTR_DOMAIN | \
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NETLBL_SECATTR_FREE_DOMAIN)
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#define NETLBL_SECATTR_CACHE 0x00000002
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#define NETLBL_SECATTR_MLS_LVL 0x00000004
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#define NETLBL_SECATTR_MLS_CAT 0x00000008
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#define NETLBL_SECATTR_SECID 0x00000010
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/* bitmap meta-values for 'flags' */
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#define NETLBL_SECATTR_FREE_DOMAIN 0x01000000
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#define NETLBL_SECATTR_CACHEABLE (NETLBL_SECATTR_MLS_LVL | \
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NETLBL_SECATTR_MLS_CAT | \
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NETLBL_SECATTR_SECID)
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u32 type;
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char *domain;
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struct netlbl_lsm_cache *cache;
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union {
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struct {
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struct netlbl_lsm_secattr_catmap *cat;
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u32 lvl;
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} mls;
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u32 secid;
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} attr;
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};
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/*
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* LSM security attribute operations (inline)
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*/
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/**
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* netlbl_secattr_cache_alloc - Allocate and initialize a secattr cache
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* @flags: the memory allocation flags
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*
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* Description:
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* Allocate and initialize a netlbl_lsm_cache structure. Returns a pointer
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* on success, NULL on failure.
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*
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*/
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static inline struct netlbl_lsm_cache *netlbl_secattr_cache_alloc(gfp_t flags)
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{
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struct netlbl_lsm_cache *cache;
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cache = kzalloc(sizeof(*cache), flags);
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if (cache)
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atomic_set(&cache->refcount, 1);
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return cache;
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}
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/**
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* netlbl_secattr_cache_free - Frees a netlbl_lsm_cache struct
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* @cache: the struct to free
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*
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* Description:
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* Frees @secattr including all of the internal buffers.
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*
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*/
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static inline void netlbl_secattr_cache_free(struct netlbl_lsm_cache *cache)
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{
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if (!atomic_dec_and_test(&cache->refcount))
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return;
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if (cache->free)
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cache->free(cache->data);
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kfree(cache);
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}
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/**
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* netlbl_secattr_catmap_alloc - Allocate a LSM secattr catmap
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* @flags: memory allocation flags
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*
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* Description:
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* Allocate memory for a LSM secattr catmap, returns a pointer on success, NULL
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* on failure.
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*
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*/
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static inline struct netlbl_lsm_secattr_catmap *netlbl_secattr_catmap_alloc(
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gfp_t flags)
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{
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return kzalloc(sizeof(struct netlbl_lsm_secattr_catmap), flags);
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}
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/**
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* netlbl_secattr_catmap_free - Free a LSM secattr catmap
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* @catmap: the category bitmap
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*
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* Description:
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* Free a LSM secattr catmap.
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*
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*/
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static inline void netlbl_secattr_catmap_free(
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struct netlbl_lsm_secattr_catmap *catmap)
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{
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struct netlbl_lsm_secattr_catmap *iter;
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do {
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iter = catmap;
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catmap = catmap->next;
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kfree(iter);
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} while (catmap);
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}
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/**
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* netlbl_secattr_init - Initialize a netlbl_lsm_secattr struct
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* @secattr: the struct to initialize
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*
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* Description:
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* Initialize an already allocated netlbl_lsm_secattr struct.
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*
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*/
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static inline void netlbl_secattr_init(struct netlbl_lsm_secattr *secattr)
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{
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memset(secattr, 0, sizeof(*secattr));
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}
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/**
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* netlbl_secattr_destroy - Clears a netlbl_lsm_secattr struct
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* @secattr: the struct to clear
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*
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* Description:
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* Destroys the @secattr struct, including freeing all of the internal buffers.
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* The struct must be reset with a call to netlbl_secattr_init() before reuse.
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*
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*/
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static inline void netlbl_secattr_destroy(struct netlbl_lsm_secattr *secattr)
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{
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if (secattr->flags & NETLBL_SECATTR_FREE_DOMAIN)
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kfree(secattr->domain);
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if (secattr->flags & NETLBL_SECATTR_CACHE)
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netlbl_secattr_cache_free(secattr->cache);
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if (secattr->flags & NETLBL_SECATTR_MLS_CAT)
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netlbl_secattr_catmap_free(secattr->attr.mls.cat);
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}
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/**
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* netlbl_secattr_alloc - Allocate and initialize a netlbl_lsm_secattr struct
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* @flags: the memory allocation flags
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*
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* Description:
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* Allocate and initialize a netlbl_lsm_secattr struct. Returns a valid
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* pointer on success, or NULL on failure.
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*
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*/
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static inline struct netlbl_lsm_secattr *netlbl_secattr_alloc(gfp_t flags)
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{
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return kzalloc(sizeof(struct netlbl_lsm_secattr), flags);
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}
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/**
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* netlbl_secattr_free - Frees a netlbl_lsm_secattr struct
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* @secattr: the struct to free
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*
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* Description:
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* Frees @secattr including all of the internal buffers.
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*
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*/
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static inline void netlbl_secattr_free(struct netlbl_lsm_secattr *secattr)
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{
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netlbl_secattr_destroy(secattr);
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kfree(secattr);
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}
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#ifdef CONFIG_NETLABEL
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/*
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* LSM configuration operations
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*/
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int netlbl_cfg_map_del(const char *domain, struct netlbl_audit *audit_info);
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int netlbl_cfg_unlbl_add_map(const char *domain,
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struct netlbl_audit *audit_info);
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int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
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struct netlbl_audit *audit_info);
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int netlbl_cfg_cipsov4_add_map(struct cipso_v4_doi *doi_def,
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const char *domain,
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struct netlbl_audit *audit_info);
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int netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info);
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/*
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* LSM security attribute operations
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*/
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int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
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u32 offset);
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int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
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u32 offset);
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int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
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u32 bit,
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gfp_t flags);
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int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
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u32 start,
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u32 end,
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gfp_t flags);
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/*
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* LSM protocol operations (NetLabel LSM/kernel API)
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*/
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int netlbl_enabled(void);
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int netlbl_sock_setattr(struct sock *sk,
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const struct netlbl_lsm_secattr *secattr);
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int netlbl_sock_getattr(struct sock *sk,
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struct netlbl_lsm_secattr *secattr);
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int netlbl_skbuff_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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void netlbl_skbuff_err(struct sk_buff *skb, int error);
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/*
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* LSM label mapping cache operations
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*/
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void netlbl_cache_invalidate(void);
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int netlbl_cache_add(const struct sk_buff *skb,
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const struct netlbl_lsm_secattr *secattr);
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#else
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static inline int netlbl_cfg_map_del(const char *domain,
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struct netlbl_audit *audit_info)
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{
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return -ENOSYS;
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}
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static inline int netlbl_cfg_unlbl_add_map(const char *domain,
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struct netlbl_audit *audit_info)
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{
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return -ENOSYS;
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}
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static inline int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
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struct netlbl_audit *audit_info)
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{
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return -ENOSYS;
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}
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static inline int netlbl_cfg_cipsov4_add_map(struct cipso_v4_doi *doi_def,
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const char *domain,
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struct netlbl_audit *audit_info)
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{
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return -ENOSYS;
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}
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static inline int netlbl_cfg_cipsov4_del(u32 doi,
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struct netlbl_audit *audit_info)
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{
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return -ENOSYS;
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}
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static inline int netlbl_secattr_catmap_walk(
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struct netlbl_lsm_secattr_catmap *catmap,
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u32 offset)
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{
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return -ENOENT;
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}
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static inline int netlbl_secattr_catmap_walk_rng(
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struct netlbl_lsm_secattr_catmap *catmap,
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u32 offset)
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{
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return -ENOENT;
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}
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static inline int netlbl_secattr_catmap_setbit(
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struct netlbl_lsm_secattr_catmap *catmap,
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u32 bit,
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gfp_t flags)
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{
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return 0;
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}
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static inline int netlbl_secattr_catmap_setrng(
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struct netlbl_lsm_secattr_catmap *catmap,
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u32 start,
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u32 end,
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gfp_t flags)
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{
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return 0;
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}
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static inline int netlbl_enabled(void)
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{
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return 0;
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}
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static inline int netlbl_sock_setattr(struct sock *sk,
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const struct netlbl_lsm_secattr *secattr)
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{
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return -ENOSYS;
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}
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static inline int netlbl_sock_getattr(struct sock *sk,
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struct netlbl_lsm_secattr *secattr)
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{
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return -ENOSYS;
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}
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static inline int netlbl_skbuff_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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{
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return -ENOSYS;
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}
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static inline void netlbl_skbuff_err(struct sk_buff *skb, int error)
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{
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return;
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}
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static inline void netlbl_cache_invalidate(void)
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{
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return;
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}
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static inline int netlbl_cache_add(const struct sk_buff *skb,
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const struct netlbl_lsm_secattr *secattr)
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{
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return 0;
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}
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#endif /* CONFIG_NETLABEL */
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#endif /* _NETLABEL_H */
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