1083 строки
28 KiB
C
1083 строки
28 KiB
C
/*
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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@paul-moore.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, 2008
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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/slab.h>
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#include <linux/audit.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <net/ip.h>
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#include <net/ipv6.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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#include <linux/atomic.h>
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#include "netlabel_domainhash.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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#include "netlabel_mgmt.h"
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#include "netlabel_addrlist.h"
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/*
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* Configuration Functions
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*/
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/**
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* netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
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* @domain: the domain mapping to remove
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* @family: address family
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* @addr: IP address
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* @mask: IP address mask
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* @audit_info: NetLabel audit information
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*
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* Description:
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* Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the
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* default domain mapping to be removed. Returns zero on success, negative
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* values on failure.
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*
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*/
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int netlbl_cfg_map_del(const char *domain,
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u16 family,
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const void *addr,
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const void *mask,
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struct netlbl_audit *audit_info)
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{
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if (addr == NULL && mask == NULL) {
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return netlbl_domhsh_remove(domain, audit_info);
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} else if (addr != NULL && mask != NULL) {
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switch (family) {
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case AF_INET:
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return netlbl_domhsh_remove_af4(domain, addr, mask,
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audit_info);
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default:
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return -EPFNOSUPPORT;
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}
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} else
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return -EINVAL;
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}
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/**
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* netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
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* @domain: the domain mapping to add
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* @family: address family
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* @addr: IP address
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* @mask: IP address mask
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* @audit_info: NetLabel audit information
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*
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* Description:
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* Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL
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* causes a new default domain mapping to be added. 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_cfg_unlbl_map_add(const char *domain,
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u16 family,
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const void *addr,
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const void *mask,
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struct netlbl_audit *audit_info)
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{
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int ret_val = -ENOMEM;
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struct netlbl_dom_map *entry;
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struct netlbl_domaddr_map *addrmap = NULL;
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struct netlbl_domaddr4_map *map4 = NULL;
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struct netlbl_domaddr6_map *map6 = NULL;
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entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
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if (entry == NULL)
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return -ENOMEM;
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if (domain != NULL) {
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entry->domain = kstrdup(domain, GFP_ATOMIC);
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if (entry->domain == NULL)
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goto cfg_unlbl_map_add_failure;
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}
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if (addr == NULL && mask == NULL)
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entry->def.type = NETLBL_NLTYPE_UNLABELED;
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else if (addr != NULL && mask != NULL) {
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addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
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if (addrmap == NULL)
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goto cfg_unlbl_map_add_failure;
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INIT_LIST_HEAD(&addrmap->list4);
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INIT_LIST_HEAD(&addrmap->list6);
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switch (family) {
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case AF_INET: {
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const struct in_addr *addr4 = addr;
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const struct in_addr *mask4 = mask;
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map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
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if (map4 == NULL)
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goto cfg_unlbl_map_add_failure;
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map4->def.type = NETLBL_NLTYPE_UNLABELED;
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map4->list.addr = addr4->s_addr & mask4->s_addr;
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map4->list.mask = mask4->s_addr;
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map4->list.valid = 1;
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ret_val = netlbl_af4list_add(&map4->list,
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&addrmap->list4);
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if (ret_val != 0)
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goto cfg_unlbl_map_add_failure;
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break;
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}
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#if IS_ENABLED(CONFIG_IPV6)
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case AF_INET6: {
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const struct in6_addr *addr6 = addr;
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const struct in6_addr *mask6 = mask;
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map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
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if (map6 == NULL)
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goto cfg_unlbl_map_add_failure;
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map6->def.type = NETLBL_NLTYPE_UNLABELED;
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map6->list.addr = *addr6;
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map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
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map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
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map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
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map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
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map6->list.mask = *mask6;
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map6->list.valid = 1;
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ret_val = netlbl_af6list_add(&map6->list,
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&addrmap->list6);
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if (ret_val != 0)
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goto cfg_unlbl_map_add_failure;
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break;
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}
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#endif /* IPv6 */
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default:
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goto cfg_unlbl_map_add_failure;
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break;
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}
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entry->def.addrsel = addrmap;
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entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
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} else {
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ret_val = -EINVAL;
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goto cfg_unlbl_map_add_failure;
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}
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ret_val = netlbl_domhsh_add(entry, audit_info);
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if (ret_val != 0)
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goto cfg_unlbl_map_add_failure;
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return 0;
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cfg_unlbl_map_add_failure:
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kfree(entry->domain);
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kfree(entry);
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kfree(addrmap);
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kfree(map4);
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kfree(map6);
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return ret_val;
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}
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/**
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* netlbl_cfg_unlbl_static_add - Adds a new static label
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* @net: network namespace
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* @dev_name: interface name
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* @addr: IP address in network byte order (struct in[6]_addr)
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* @mask: address mask in network byte order (struct in[6]_addr)
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* @family: address family
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* @secid: LSM secid value for the entry
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* @audit_info: NetLabel audit information
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*
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* Description:
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* Adds a new NetLabel static label to be used when protocol provided labels
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* are not present on incoming traffic. If @dev_name is NULL then the default
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* interface will be used. Returns zero on success, negative values on failure.
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*
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*/
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int netlbl_cfg_unlbl_static_add(struct net *net,
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const char *dev_name,
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const void *addr,
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const void *mask,
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u16 family,
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u32 secid,
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struct netlbl_audit *audit_info)
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{
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u32 addr_len;
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switch (family) {
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case AF_INET:
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addr_len = sizeof(struct in_addr);
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break;
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#if IS_ENABLED(CONFIG_IPV6)
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case AF_INET6:
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addr_len = sizeof(struct in6_addr);
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break;
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#endif /* IPv6 */
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default:
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return -EPFNOSUPPORT;
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}
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return netlbl_unlhsh_add(net,
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dev_name, addr, mask, addr_len,
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secid, audit_info);
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}
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/**
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* netlbl_cfg_unlbl_static_del - Removes an existing static label
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* @net: network namespace
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* @dev_name: interface name
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* @addr: IP address in network byte order (struct in[6]_addr)
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* @mask: address mask in network byte order (struct in[6]_addr)
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* @family: address family
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* @secid: LSM secid value for the entry
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* @audit_info: NetLabel audit information
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*
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* Description:
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* Removes an existing NetLabel static label used when protocol provided labels
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* are not present on incoming traffic. If @dev_name is NULL then the default
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* interface will be used. Returns zero on success, negative values on failure.
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*
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*/
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int netlbl_cfg_unlbl_static_del(struct net *net,
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const char *dev_name,
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const void *addr,
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const void *mask,
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u16 family,
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struct netlbl_audit *audit_info)
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{
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u32 addr_len;
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switch (family) {
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case AF_INET:
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addr_len = sizeof(struct in_addr);
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break;
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#if IS_ENABLED(CONFIG_IPV6)
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case AF_INET6:
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addr_len = sizeof(struct in6_addr);
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break;
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#endif /* IPv6 */
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default:
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return -EPFNOSUPPORT;
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}
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return netlbl_unlhsh_remove(net,
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dev_name, addr, mask, addr_len,
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audit_info);
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}
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/**
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* netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
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* @doi_def: CIPSO DOI definition
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* @audit_info: NetLabel audit information
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*
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* Description:
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* Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
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* success and negative values on failure.
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*
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*/
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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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{
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return cipso_v4_doi_add(doi_def, audit_info);
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}
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/**
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* netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
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* @doi: CIPSO DOI
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* @audit_info: NetLabel audit information
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*
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* Description:
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* Remove an existing CIPSO DOI definition matching @doi. Returns zero on
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* success and negative values on failure.
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*
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*/
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void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
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{
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cipso_v4_doi_remove(doi, audit_info);
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}
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/**
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* netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
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* @doi: the CIPSO DOI
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* @domain: the domain mapping to add
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* @addr: IP address
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* @mask: IP address mask
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* @audit_info: NetLabel audit information
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*
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* Description:
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* Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
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* subsystem. A @domain value of NULL adds a new default domain mapping.
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* Returns zero on success, negative values on failure.
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*
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*/
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int netlbl_cfg_cipsov4_map_add(u32 doi,
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const char *domain,
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const struct in_addr *addr,
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const struct in_addr *mask,
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struct netlbl_audit *audit_info)
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{
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int ret_val = -ENOMEM;
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struct cipso_v4_doi *doi_def;
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struct netlbl_dom_map *entry;
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struct netlbl_domaddr_map *addrmap = NULL;
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struct netlbl_domaddr4_map *addrinfo = NULL;
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doi_def = cipso_v4_doi_getdef(doi);
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if (doi_def == NULL)
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return -ENOENT;
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entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
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if (entry == NULL)
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goto out_entry;
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if (domain != NULL) {
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entry->domain = kstrdup(domain, GFP_ATOMIC);
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if (entry->domain == NULL)
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goto out_domain;
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}
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if (addr == NULL && mask == NULL) {
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entry->def.cipso = doi_def;
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entry->def.type = NETLBL_NLTYPE_CIPSOV4;
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} else if (addr != NULL && mask != NULL) {
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addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
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if (addrmap == NULL)
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goto out_addrmap;
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INIT_LIST_HEAD(&addrmap->list4);
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INIT_LIST_HEAD(&addrmap->list6);
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addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
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if (addrinfo == NULL)
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goto out_addrinfo;
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addrinfo->def.cipso = doi_def;
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addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
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addrinfo->list.addr = addr->s_addr & mask->s_addr;
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addrinfo->list.mask = mask->s_addr;
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addrinfo->list.valid = 1;
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ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
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if (ret_val != 0)
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goto cfg_cipsov4_map_add_failure;
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entry->def.addrsel = addrmap;
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entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
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} else {
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ret_val = -EINVAL;
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goto out_addrmap;
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}
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ret_val = netlbl_domhsh_add(entry, audit_info);
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if (ret_val != 0)
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goto cfg_cipsov4_map_add_failure;
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return 0;
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cfg_cipsov4_map_add_failure:
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kfree(addrinfo);
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out_addrinfo:
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kfree(addrmap);
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out_addrmap:
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kfree(entry->domain);
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out_domain:
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kfree(entry);
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out_entry:
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cipso_v4_doi_putdef(doi_def);
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return ret_val;
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}
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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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|
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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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|
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return -ENOENT;
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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
|
|
* @offset: the offset to start searching at, in bits
|
|
*
|
|
* Description:
|
|
* 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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*/
|
|
int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
|
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u32 offset)
|
|
{
|
|
struct netlbl_lsm_secattr_catmap *iter = catmap;
|
|
u32 node_idx;
|
|
u32 node_bit;
|
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NETLBL_CATMAP_MAPTYPE bitmask;
|
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NETLBL_CATMAP_MAPTYPE bitmap;
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|
|
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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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|
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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;
|
|
node_bit++;
|
|
}
|
|
|
|
if (bitmask != 0)
|
|
return iter->startbit +
|
|
(NETLBL_CATMAP_MAPSIZE * node_idx) +
|
|
node_bit - 1;
|
|
else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
|
|
if (iter->next == NULL)
|
|
return iter->startbit + NETLBL_CATMAP_SIZE - 1;
|
|
iter = iter->next;
|
|
node_idx = 0;
|
|
}
|
|
bitmask = NETLBL_CATMAP_BIT;
|
|
node_bit = 0;
|
|
}
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
/**
|
|
* netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
|
|
* @catmap: the category bitmap
|
|
* @bit: the bit to set
|
|
* @flags: memory allocation flags
|
|
*
|
|
* Description:
|
|
* Set the bit specified by @bit in @catmap. Returns zero on success,
|
|
* negative values on failure.
|
|
*
|
|
*/
|
|
int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
|
|
u32 bit,
|
|
gfp_t flags)
|
|
{
|
|
struct netlbl_lsm_secattr_catmap *iter = catmap;
|
|
u32 node_bit;
|
|
u32 node_idx;
|
|
|
|
while (iter->next != NULL &&
|
|
bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
|
|
iter = iter->next;
|
|
if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
|
|
iter->next = netlbl_secattr_catmap_alloc(flags);
|
|
if (iter->next == NULL)
|
|
return -ENOMEM;
|
|
iter = iter->next;
|
|
iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
|
|
}
|
|
|
|
/* gcc always rounds to zero when doing integer division */
|
|
node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
|
|
node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx);
|
|
iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
|
|
* @catmap: the category bitmap
|
|
* @start: the starting bit
|
|
* @end: the last bit in the string
|
|
* @flags: memory allocation flags
|
|
*
|
|
* Description:
|
|
* Set a range of bits, starting at @start and ending with @end. Returns zero
|
|
* on success, negative values on failure.
|
|
*
|
|
*/
|
|
int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
|
|
u32 start,
|
|
u32 end,
|
|
gfp_t flags)
|
|
{
|
|
int ret_val = 0;
|
|
struct netlbl_lsm_secattr_catmap *iter = catmap;
|
|
u32 iter_max_spot;
|
|
u32 spot;
|
|
|
|
/* XXX - This could probably be made a bit faster by combining writes
|
|
* to the catmap instead of setting a single bit each time, but for
|
|
* right now skipping to the start of the range in the catmap should
|
|
* be a nice improvement over calling the individual setbit function
|
|
* repeatedly from a loop. */
|
|
|
|
while (iter->next != NULL &&
|
|
start >= (iter->startbit + NETLBL_CATMAP_SIZE))
|
|
iter = iter->next;
|
|
iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
|
|
|
|
for (spot = start; spot <= end && ret_val == 0; spot++) {
|
|
if (spot >= iter_max_spot && iter->next != NULL) {
|
|
iter = iter->next;
|
|
iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
|
|
}
|
|
ret_val = netlbl_secattr_catmap_setbit(iter, spot, flags);
|
|
}
|
|
|
|
return ret_val;
|
|
}
|
|
|
|
/*
|
|
* LSM Functions
|
|
*/
|
|
|
|
/**
|
|
* netlbl_enabled - Determine if the NetLabel subsystem is enabled
|
|
*
|
|
* Description:
|
|
* The LSM can use this function to determine if it should use NetLabel
|
|
* security attributes in it's enforcement mechanism. Currently, NetLabel is
|
|
* considered to be enabled when it's configuration contains a valid setup for
|
|
* at least one labeled protocol (i.e. NetLabel can understand incoming
|
|
* labeled packets of at least one type); otherwise NetLabel is considered to
|
|
* be disabled.
|
|
*
|
|
*/
|
|
int netlbl_enabled(void)
|
|
{
|
|
/* At some point we probably want to expose this mechanism to the user
|
|
* as well so that admins can toggle NetLabel regardless of the
|
|
* configuration */
|
|
return (atomic_read(&netlabel_mgmt_protocount) > 0);
|
|
}
|
|
|
|
/**
|
|
* netlbl_sock_setattr - Label a socket using the correct protocol
|
|
* @sk: the socket to label
|
|
* @family: protocol family
|
|
* @secattr: the security attributes
|
|
*
|
|
* Description:
|
|
* Attach the correct label to the given socket using the security attributes
|
|
* specified in @secattr. This function requires exclusive access to @sk,
|
|
* which means it either needs to be in the process of being created or locked.
|
|
* Returns zero on success, -EDESTADDRREQ if the domain is configured to use
|
|
* network address selectors (can't blindly label the socket), and negative
|
|
* values on all other failures.
|
|
*
|
|
*/
|
|
int netlbl_sock_setattr(struct sock *sk,
|
|
u16 family,
|
|
const struct netlbl_lsm_secattr *secattr)
|
|
{
|
|
int ret_val;
|
|
struct netlbl_dom_map *dom_entry;
|
|
|
|
rcu_read_lock();
|
|
dom_entry = netlbl_domhsh_getentry(secattr->domain);
|
|
if (dom_entry == NULL) {
|
|
ret_val = -ENOENT;
|
|
goto socket_setattr_return;
|
|
}
|
|
switch (family) {
|
|
case AF_INET:
|
|
switch (dom_entry->def.type) {
|
|
case NETLBL_NLTYPE_ADDRSELECT:
|
|
ret_val = -EDESTADDRREQ;
|
|
break;
|
|
case NETLBL_NLTYPE_CIPSOV4:
|
|
ret_val = cipso_v4_sock_setattr(sk,
|
|
dom_entry->def.cipso,
|
|
secattr);
|
|
break;
|
|
case NETLBL_NLTYPE_UNLABELED:
|
|
ret_val = 0;
|
|
break;
|
|
default:
|
|
ret_val = -ENOENT;
|
|
}
|
|
break;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case AF_INET6:
|
|
/* since we don't support any IPv6 labeling protocols right
|
|
* now we can optimize everything away until we do */
|
|
ret_val = 0;
|
|
break;
|
|
#endif /* IPv6 */
|
|
default:
|
|
ret_val = -EPROTONOSUPPORT;
|
|
}
|
|
|
|
socket_setattr_return:
|
|
rcu_read_unlock();
|
|
return ret_val;
|
|
}
|
|
|
|
/**
|
|
* netlbl_sock_delattr - Delete all the NetLabel labels on a socket
|
|
* @sk: the socket
|
|
*
|
|
* Description:
|
|
* Remove all the NetLabel labeling from @sk. The caller is responsible for
|
|
* ensuring that @sk is locked.
|
|
*
|
|
*/
|
|
void netlbl_sock_delattr(struct sock *sk)
|
|
{
|
|
cipso_v4_sock_delattr(sk);
|
|
}
|
|
|
|
/**
|
|
* netlbl_sock_getattr - Determine the security attributes of a sock
|
|
* @sk: the sock
|
|
* @secattr: the security attributes
|
|
*
|
|
* Description:
|
|
* Examines the given sock to see if any NetLabel style labeling has been
|
|
* applied to the sock, if so it parses the socket label and returns the
|
|
* security attributes in @secattr. Returns zero on success, negative values
|
|
* on failure.
|
|
*
|
|
*/
|
|
int netlbl_sock_getattr(struct sock *sk,
|
|
struct netlbl_lsm_secattr *secattr)
|
|
{
|
|
int ret_val;
|
|
|
|
switch (sk->sk_family) {
|
|
case AF_INET:
|
|
ret_val = cipso_v4_sock_getattr(sk, secattr);
|
|
break;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case AF_INET6:
|
|
ret_val = -ENOMSG;
|
|
break;
|
|
#endif /* IPv6 */
|
|
default:
|
|
ret_val = -EPROTONOSUPPORT;
|
|
}
|
|
|
|
return ret_val;
|
|
}
|
|
|
|
/**
|
|
* netlbl_conn_setattr - Label a connected socket using the correct protocol
|
|
* @sk: the socket to label
|
|
* @addr: the destination address
|
|
* @secattr: the security attributes
|
|
*
|
|
* Description:
|
|
* Attach the correct label to the given connected socket using the security
|
|
* attributes specified in @secattr. The caller is responsible for ensuring
|
|
* that @sk is locked. Returns zero on success, negative values on failure.
|
|
*
|
|
*/
|
|
int netlbl_conn_setattr(struct sock *sk,
|
|
struct sockaddr *addr,
|
|
const struct netlbl_lsm_secattr *secattr)
|
|
{
|
|
int ret_val;
|
|
struct sockaddr_in *addr4;
|
|
struct netlbl_dommap_def *entry;
|
|
|
|
rcu_read_lock();
|
|
switch (addr->sa_family) {
|
|
case AF_INET:
|
|
addr4 = (struct sockaddr_in *)addr;
|
|
entry = netlbl_domhsh_getentry_af4(secattr->domain,
|
|
addr4->sin_addr.s_addr);
|
|
if (entry == NULL) {
|
|
ret_val = -ENOENT;
|
|
goto conn_setattr_return;
|
|
}
|
|
switch (entry->type) {
|
|
case NETLBL_NLTYPE_CIPSOV4:
|
|
ret_val = cipso_v4_sock_setattr(sk,
|
|
entry->cipso, secattr);
|
|
break;
|
|
case NETLBL_NLTYPE_UNLABELED:
|
|
/* just delete the protocols we support for right now
|
|
* but we could remove other protocols if needed */
|
|
cipso_v4_sock_delattr(sk);
|
|
ret_val = 0;
|
|
break;
|
|
default:
|
|
ret_val = -ENOENT;
|
|
}
|
|
break;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case AF_INET6:
|
|
/* since we don't support any IPv6 labeling protocols right
|
|
* now we can optimize everything away until we do */
|
|
ret_val = 0;
|
|
break;
|
|
#endif /* IPv6 */
|
|
default:
|
|
ret_val = -EPROTONOSUPPORT;
|
|
}
|
|
|
|
conn_setattr_return:
|
|
rcu_read_unlock();
|
|
return ret_val;
|
|
}
|
|
|
|
/**
|
|
* netlbl_req_setattr - Label a request socket using the correct protocol
|
|
* @req: the request socket to label
|
|
* @secattr: the security attributes
|
|
*
|
|
* Description:
|
|
* Attach the correct label to the given socket using the security attributes
|
|
* specified in @secattr. Returns zero on success, negative values on failure.
|
|
*
|
|
*/
|
|
int netlbl_req_setattr(struct request_sock *req,
|
|
const struct netlbl_lsm_secattr *secattr)
|
|
{
|
|
int ret_val;
|
|
struct netlbl_dommap_def *entry;
|
|
|
|
rcu_read_lock();
|
|
switch (req->rsk_ops->family) {
|
|
case AF_INET:
|
|
entry = netlbl_domhsh_getentry_af4(secattr->domain,
|
|
inet_rsk(req)->ir_rmt_addr);
|
|
if (entry == NULL) {
|
|
ret_val = -ENOENT;
|
|
goto req_setattr_return;
|
|
}
|
|
switch (entry->type) {
|
|
case NETLBL_NLTYPE_CIPSOV4:
|
|
ret_val = cipso_v4_req_setattr(req,
|
|
entry->cipso, secattr);
|
|
break;
|
|
case NETLBL_NLTYPE_UNLABELED:
|
|
/* just delete the protocols we support for right now
|
|
* but we could remove other protocols if needed */
|
|
cipso_v4_req_delattr(req);
|
|
ret_val = 0;
|
|
break;
|
|
default:
|
|
ret_val = -ENOENT;
|
|
}
|
|
break;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case AF_INET6:
|
|
/* since we don't support any IPv6 labeling protocols right
|
|
* now we can optimize everything away until we do */
|
|
ret_val = 0;
|
|
break;
|
|
#endif /* IPv6 */
|
|
default:
|
|
ret_val = -EPROTONOSUPPORT;
|
|
}
|
|
|
|
req_setattr_return:
|
|
rcu_read_unlock();
|
|
return ret_val;
|
|
}
|
|
|
|
/**
|
|
* netlbl_req_delattr - Delete all the NetLabel labels on a socket
|
|
* @req: the socket
|
|
*
|
|
* Description:
|
|
* Remove all the NetLabel labeling from @req.
|
|
*
|
|
*/
|
|
void netlbl_req_delattr(struct request_sock *req)
|
|
{
|
|
cipso_v4_req_delattr(req);
|
|
}
|
|
|
|
/**
|
|
* netlbl_skbuff_setattr - Label a packet using the correct protocol
|
|
* @skb: the packet
|
|
* @family: protocol family
|
|
* @secattr: the security attributes
|
|
*
|
|
* Description:
|
|
* Attach the correct label to the given packet using the security attributes
|
|
* specified in @secattr. Returns zero on success, negative values on failure.
|
|
*
|
|
*/
|
|
int netlbl_skbuff_setattr(struct sk_buff *skb,
|
|
u16 family,
|
|
const struct netlbl_lsm_secattr *secattr)
|
|
{
|
|
int ret_val;
|
|
struct iphdr *hdr4;
|
|
struct netlbl_dommap_def *entry;
|
|
|
|
rcu_read_lock();
|
|
switch (family) {
|
|
case AF_INET:
|
|
hdr4 = ip_hdr(skb);
|
|
entry = netlbl_domhsh_getentry_af4(secattr->domain,hdr4->daddr);
|
|
if (entry == NULL) {
|
|
ret_val = -ENOENT;
|
|
goto skbuff_setattr_return;
|
|
}
|
|
switch (entry->type) {
|
|
case NETLBL_NLTYPE_CIPSOV4:
|
|
ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
|
|
secattr);
|
|
break;
|
|
case NETLBL_NLTYPE_UNLABELED:
|
|
/* just delete the protocols we support for right now
|
|
* but we could remove other protocols if needed */
|
|
ret_val = cipso_v4_skbuff_delattr(skb);
|
|
break;
|
|
default:
|
|
ret_val = -ENOENT;
|
|
}
|
|
break;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case AF_INET6:
|
|
/* since we don't support any IPv6 labeling protocols right
|
|
* now we can optimize everything away until we do */
|
|
ret_val = 0;
|
|
break;
|
|
#endif /* IPv6 */
|
|
default:
|
|
ret_val = -EPROTONOSUPPORT;
|
|
}
|
|
|
|
skbuff_setattr_return:
|
|
rcu_read_unlock();
|
|
return ret_val;
|
|
}
|
|
|
|
/**
|
|
* netlbl_skbuff_getattr - Determine the security attributes of a packet
|
|
* @skb: the packet
|
|
* @family: protocol family
|
|
* @secattr: the security attributes
|
|
*
|
|
* Description:
|
|
* Examines the given packet to see if a recognized form of packet labeling
|
|
* is present, if so it parses the packet label and returns the security
|
|
* attributes in @secattr. Returns zero on success, negative values on
|
|
* failure.
|
|
*
|
|
*/
|
|
int netlbl_skbuff_getattr(const struct sk_buff *skb,
|
|
u16 family,
|
|
struct netlbl_lsm_secattr *secattr)
|
|
{
|
|
switch (family) {
|
|
case AF_INET:
|
|
if (CIPSO_V4_OPTEXIST(skb) &&
|
|
cipso_v4_skbuff_getattr(skb, secattr) == 0)
|
|
return 0;
|
|
break;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case AF_INET6:
|
|
break;
|
|
#endif /* IPv6 */
|
|
}
|
|
|
|
return netlbl_unlabel_getattr(skb, family, secattr);
|
|
}
|
|
|
|
/**
|
|
* netlbl_skbuff_err - Handle a LSM error on a sk_buff
|
|
* @skb: the packet
|
|
* @error: the error code
|
|
* @gateway: true if host is acting as a gateway, false otherwise
|
|
*
|
|
* 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, int gateway)
|
|
{
|
|
if (CIPSO_V4_OPTEXIST(skb))
|
|
cipso_v4_error(skb, error, gateway);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
|
|
return -ENOMSG;
|
|
|
|
if (CIPSO_V4_OPTEXIST(skb))
|
|
return cipso_v4_cache_add(skb, secattr);
|
|
|
|
return -ENOMSG;
|
|
}
|
|
|
|
/*
|
|
* Protocol Engine Functions
|
|
*/
|
|
|
|
/**
|
|
* netlbl_audit_start - Start an audit message
|
|
* @type: audit message type
|
|
* @audit_info: NetLabel audit information
|
|
*
|
|
* Description:
|
|
* Start an audit message using the type specified in @type and fill the audit
|
|
* message with some fields common to all NetLabel audit messages. This
|
|
* function should only be used by protocol engines, not LSMs. Returns a
|
|
* pointer to the audit buffer on success, NULL on failure.
|
|
*
|
|
*/
|
|
struct audit_buffer *netlbl_audit_start(int type,
|
|
struct netlbl_audit *audit_info)
|
|
{
|
|
return netlbl_audit_start_common(type, audit_info);
|
|
}
|
|
|
|
/*
|
|
* 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_unlabel_init(NETLBL_UNLHSH_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);
|