2006-08-04 01:48:37 +02:00
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/*
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* NetLabel Kernel API
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*
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* This file defines the kernel API for the NetLabel system. The NetLabel
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* system manages static and dynamic label mappings for network protocols such
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* 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 <net/ip.h>
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#include <net/netlabel.h>
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#include <net/cipso_ipv4.h>
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#include <asm/bug.h>
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2008-01-29 14:37:52 +01:00
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#include <asm/atomic.h>
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2006-08-04 01:48:37 +02:00
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#include "netlabel_domainhash.h"
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#include "netlabel_unlabeled.h"
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#include "netlabel_user.h"
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2007-07-18 18:28:45 +02:00
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#include "netlabel_mgmt.h"
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2006-08-04 01:48:37 +02:00
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2006-11-29 19:18:18 +01:00
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/*
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* Security Attribute Functions
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*/
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/**
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* netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit
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* @catmap: the category bitmap
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* @offset: the offset to start searching at, in bits
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*
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* Description:
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* This function walks a LSM secattr category bitmap starting at @offset and
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* returns the spot of the first set bit or -ENOENT if no bits are set.
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*
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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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{
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struct netlbl_lsm_secattr_catmap *iter = catmap;
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u32 node_idx;
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u32 node_bit;
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NETLBL_CATMAP_MAPTYPE bitmap;
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if (offset > iter->startbit) {
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while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
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iter = iter->next;
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if (iter == NULL)
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return -ENOENT;
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}
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node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
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node_bit = offset - iter->startbit -
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(NETLBL_CATMAP_MAPSIZE * node_idx);
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} else {
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node_idx = 0;
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node_bit = 0;
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}
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bitmap = iter->bitmap[node_idx] >> node_bit;
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for (;;) {
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if (bitmap != 0) {
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while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
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bitmap >>= 1;
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node_bit++;
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}
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return iter->startbit +
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(NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit;
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}
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if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
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if (iter->next != NULL) {
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iter = iter->next;
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node_idx = 0;
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} else
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return -ENOENT;
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}
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bitmap = iter->bitmap[node_idx];
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node_bit = 0;
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}
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return -ENOENT;
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}
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/**
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* netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits
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* @catmap: the category bitmap
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* @offset: the offset to start searching at, in bits
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*
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* Description:
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* This function walks a LSM secattr category bitmap starting at @offset and
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* returns the spot of the first cleared bit or -ENOENT if the offset is past
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* the end of the bitmap.
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*
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*/
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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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{
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struct netlbl_lsm_secattr_catmap *iter = catmap;
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u32 node_idx;
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u32 node_bit;
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NETLBL_CATMAP_MAPTYPE bitmask;
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NETLBL_CATMAP_MAPTYPE bitmap;
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if (offset > iter->startbit) {
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while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
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iter = iter->next;
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if (iter == NULL)
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return -ENOENT;
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}
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node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
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node_bit = offset - iter->startbit -
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(NETLBL_CATMAP_MAPSIZE * node_idx);
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} else {
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node_idx = 0;
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node_bit = 0;
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}
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bitmask = NETLBL_CATMAP_BIT << node_bit;
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for (;;) {
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bitmap = iter->bitmap[node_idx];
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while (bitmask != 0 && (bitmap & bitmask) != 0) {
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bitmask <<= 1;
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node_bit++;
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}
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if (bitmask != 0)
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return iter->startbit +
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(NETLBL_CATMAP_MAPSIZE * node_idx) +
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node_bit - 1;
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else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
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if (iter->next == NULL)
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return iter->startbit + NETLBL_CATMAP_SIZE - 1;
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iter = iter->next;
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node_idx = 0;
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}
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bitmask = NETLBL_CATMAP_BIT;
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node_bit = 0;
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}
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return -ENOENT;
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}
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/**
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* netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
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* @catmap: the category bitmap
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* @bit: the bit to set
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* @flags: memory allocation flags
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*
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* Description:
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* Set the bit specified by @bit in @catmap. Returns zero on success,
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* negative values on failure.
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*
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*/
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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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{
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struct netlbl_lsm_secattr_catmap *iter = catmap;
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u32 node_bit;
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u32 node_idx;
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while (iter->next != NULL &&
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bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
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iter = iter->next;
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if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
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iter->next = netlbl_secattr_catmap_alloc(flags);
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if (iter->next == NULL)
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return -ENOMEM;
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iter = iter->next;
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iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
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}
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/* gcc always rounds to zero when doing integer division */
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node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
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node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx);
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iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit;
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return 0;
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}
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/**
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* netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
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* @catmap: the category bitmap
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* @start: the starting bit
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* @end: the last bit in the string
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* @flags: memory allocation flags
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*
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* Description:
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* Set a range of bits, starting at @start and ending with @end. Returns zero
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* on success, negative values on failure.
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*
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*/
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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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int ret_val = 0;
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struct netlbl_lsm_secattr_catmap *iter = catmap;
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u32 iter_max_spot;
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u32 spot;
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/* XXX - This could probably be made a bit faster by combining writes
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* to the catmap instead of setting a single bit each time, but for
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* right now skipping to the start of the range in the catmap should
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* be a nice improvement over calling the individual setbit function
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* repeatedly from a loop. */
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while (iter->next != NULL &&
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start >= (iter->startbit + NETLBL_CATMAP_SIZE))
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iter = iter->next;
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iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
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for (spot = start; spot <= end && ret_val == 0; spot++) {
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if (spot >= iter_max_spot && iter->next != NULL) {
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iter = iter->next;
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iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
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}
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ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC);
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}
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return ret_val;
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}
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2006-08-04 01:48:37 +02:00
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/*
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* LSM Functions
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*/
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2007-07-18 18:28:45 +02:00
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/**
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* netlbl_enabled - Determine if the NetLabel subsystem is enabled
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*
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* Description:
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* The LSM can use this function to determine if it should use NetLabel
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* security attributes in it's enforcement mechanism. Currently, NetLabel is
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* considered to be enabled when it's configuration contains a valid setup for
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* at least one labeled protocol (i.e. NetLabel can understand incoming
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* labeled packets of at least one type); otherwise NetLabel is considered to
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* be disabled.
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*
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*/
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int netlbl_enabled(void)
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{
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/* At some point we probably want to expose this mechanism to the user
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* as well so that admins can toggle NetLabel regardless of the
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* configuration */
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2008-01-29 14:37:52 +01:00
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return (atomic_read(&netlabel_mgmt_protocount) > 0);
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2007-07-18 18:28:45 +02:00
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}
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2006-08-04 01:48:37 +02:00
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/**
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* netlbl_socket_setattr - Label a socket using the correct protocol
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2007-06-08 03:37:15 +02:00
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* @sk: the socket to label
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2006-08-04 01:48:37 +02:00
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* @secattr: the security attributes
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*
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* Description:
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* Attach the correct label to the given socket using the security attributes
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2007-06-08 03:37:15 +02:00
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* specified in @secattr. This function requires exclusive access to @sk,
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* which means it either needs to be in the process of being created or locked.
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* Returns zero on success, negative values on failure.
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2006-08-04 01:48:37 +02:00
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*
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*/
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2007-06-08 03:37:15 +02:00
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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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2006-08-04 01:48:37 +02:00
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{
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int ret_val = -ENOENT;
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struct netlbl_dom_map *dom_entry;
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rcu_read_lock();
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dom_entry = netlbl_domhsh_getentry(secattr->domain);
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if (dom_entry == NULL)
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goto socket_setattr_return;
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switch (dom_entry->type) {
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case NETLBL_NLTYPE_CIPSOV4:
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2007-06-08 03:37:15 +02:00
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ret_val = cipso_v4_sock_setattr(sk,
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dom_entry->type_def.cipsov4,
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secattr);
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2006-08-04 01:48:37 +02:00
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break;
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case NETLBL_NLTYPE_UNLABELED:
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ret_val = 0;
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break;
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default:
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ret_val = -ENOENT;
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}
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socket_setattr_return:
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rcu_read_unlock();
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return ret_val;
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}
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2006-09-26 00:52:01 +02:00
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/**
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* netlbl_sock_getattr - Determine the security attributes of a sock
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* @sk: the sock
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* @secattr: the security attributes
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*
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* Description:
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* Examines the given sock to see any NetLabel style labeling has been
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* applied to the sock, if so it parses the socket label and returns the
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* security attributes in @secattr. Returns zero on success, negative values
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* on failure.
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*
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*/
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int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
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{
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int ret_val;
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ret_val = cipso_v4_sock_getattr(sk, secattr);
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if (ret_val == 0)
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return 0;
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return netlbl_unlabel_getattr(secattr);
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}
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2006-08-04 01:48:37 +02:00
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/**
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* netlbl_skbuff_getattr - Determine the security attributes of a packet
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* @skb: the packet
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* @secattr: the security attributes
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*
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* Description:
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* Examines the given packet to see if a recognized form of packet labeling
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* is present, if so it parses the packet label and returns the security
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* attributes in @secattr. Returns zero on success, negative values on
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* failure.
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*
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*/
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int netlbl_skbuff_getattr(const struct sk_buff *skb,
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struct netlbl_lsm_secattr *secattr)
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{
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2006-11-17 23:38:47 +01:00
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if (CIPSO_V4_OPTEXIST(skb) &&
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cipso_v4_skbuff_getattr(skb, secattr) == 0)
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2006-08-04 01:48:37 +02:00
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return 0;
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return netlbl_unlabel_getattr(secattr);
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}
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/**
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* netlbl_skbuff_err - Handle a LSM error on a sk_buff
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* @skb: the packet
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* @error: the error code
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*
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|
|
* Description:
|
|
|
|
* Deal with a LSM problem when handling the packet in @skb, typically this is
|
|
|
|
* a permission denied problem (-EACCES). The correct action is determined
|
|
|
|
* according to the packet's labeling protocol.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
void netlbl_skbuff_err(struct sk_buff *skb, int error)
|
|
|
|
{
|
|
|
|
if (CIPSO_V4_OPTEXIST(skb))
|
|
|
|
cipso_v4_error(skb, error, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* For all of the NetLabel protocols that support some form of label mapping
|
|
|
|
* cache, invalidate the cache. Returns zero on success, negative values on
|
|
|
|
* error.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
void netlbl_cache_invalidate(void)
|
|
|
|
{
|
|
|
|
cipso_v4_cache_invalidate();
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* netlbl_cache_add - Add an entry to a NetLabel protocol cache
|
|
|
|
* @skb: the packet
|
|
|
|
* @secattr: the packet's security attributes
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Add the LSM security attributes for the given packet to the underlying
|
|
|
|
* NetLabel protocol's label mapping cache. Returns zero on success, negative
|
|
|
|
* values on error.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
int netlbl_cache_add(const struct sk_buff *skb,
|
|
|
|
const struct netlbl_lsm_secattr *secattr)
|
|
|
|
{
|
2006-11-17 23:38:46 +01:00
|
|
|
if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
|
2006-08-04 01:48:37 +02:00
|
|
|
return -ENOMSG;
|
|
|
|
|
|
|
|
if (CIPSO_V4_OPTEXIST(skb))
|
|
|
|
return cipso_v4_cache_add(skb, secattr);
|
|
|
|
|
|
|
|
return -ENOMSG;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Setup Functions
|
|
|
|
*/
|
|
|
|
|
|
|
|
/**
|
|
|
|
* netlbl_init - Initialize NetLabel
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Perform the required NetLabel initialization before first use.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
static int __init netlbl_init(void)
|
|
|
|
{
|
|
|
|
int ret_val;
|
|
|
|
|
|
|
|
printk(KERN_INFO "NetLabel: Initializing\n");
|
|
|
|
printk(KERN_INFO "NetLabel: domain hash size = %u\n",
|
|
|
|
(1 << NETLBL_DOMHSH_BITSIZE));
|
|
|
|
printk(KERN_INFO "NetLabel: protocols ="
|
|
|
|
" UNLABELED"
|
|
|
|
" CIPSOv4"
|
|
|
|
"\n");
|
|
|
|
|
|
|
|
ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
|
|
|
|
if (ret_val != 0)
|
|
|
|
goto init_failure;
|
|
|
|
|
|
|
|
ret_val = netlbl_netlink_init();
|
|
|
|
if (ret_val != 0)
|
|
|
|
goto init_failure;
|
|
|
|
|
|
|
|
ret_val = netlbl_unlabel_defconf();
|
|
|
|
if (ret_val != 0)
|
|
|
|
goto init_failure;
|
|
|
|
printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
init_failure:
|
|
|
|
panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
|
|
|
|
}
|
|
|
|
|
|
|
|
subsys_initcall(netlbl_init);
|