616 lines
16 KiB
C
616 lines
16 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* SELinux NetLabel Support
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*
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* This file provides the necessary glue to tie NetLabel into the SELinux
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* subsystem.
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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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* (c) Copyright Hewlett-Packard Development Company, L.P., 2007, 2008
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*/
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#include <linux/spinlock.h>
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#include <linux/rcupdate.h>
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#include <linux/gfp.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <net/sock.h>
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#include <net/netlabel.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include "objsec.h"
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#include "security.h"
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#include "netlabel.h"
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/**
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* selinux_netlbl_sidlookup_cached - Cache a SID lookup
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* @skb: the packet
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* @family: the packet's address family
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* @secattr: the NetLabel security attributes
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* @sid: the SID
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*
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* Description:
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* Query the SELinux security server to lookup the correct SID for the given
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* security attributes. If the query is successful, cache the result to speed
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* up future lookups. Returns zero on success, negative values on failure.
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*
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*/
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static int selinux_netlbl_sidlookup_cached(struct sk_buff *skb,
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u16 family,
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struct netlbl_lsm_secattr *secattr,
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u32 *sid)
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{
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int rc;
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rc = security_netlbl_secattr_to_sid(&selinux_state, secattr, sid);
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if (rc == 0 &&
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(secattr->flags & NETLBL_SECATTR_CACHEABLE) &&
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(secattr->flags & NETLBL_SECATTR_CACHE))
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netlbl_cache_add(skb, family, secattr);
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return rc;
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}
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/**
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* selinux_netlbl_sock_genattr - Generate the NetLabel socket secattr
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* @sk: the socket
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*
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* Description:
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* Generate the NetLabel security attributes for a socket, making full use of
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* the socket's attribute cache. Returns a pointer to the security attributes
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* on success, NULL on failure.
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*
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*/
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static struct netlbl_lsm_secattr *selinux_netlbl_sock_genattr(struct sock *sk)
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{
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int rc;
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struct sk_security_struct *sksec = sk->sk_security;
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struct netlbl_lsm_secattr *secattr;
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if (sksec->nlbl_secattr != NULL)
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return sksec->nlbl_secattr;
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secattr = netlbl_secattr_alloc(GFP_ATOMIC);
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if (secattr == NULL)
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return NULL;
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rc = security_netlbl_sid_to_secattr(&selinux_state, sksec->sid,
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secattr);
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if (rc != 0) {
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netlbl_secattr_free(secattr);
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return NULL;
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}
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sksec->nlbl_secattr = secattr;
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return secattr;
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}
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/**
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* selinux_netlbl_sock_getattr - Get the cached NetLabel secattr
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* @sk: the socket
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* @sid: the SID
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*
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* Query the socket's cached secattr and if the SID matches the cached value
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* return the cache, otherwise return NULL.
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*
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*/
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static struct netlbl_lsm_secattr *selinux_netlbl_sock_getattr(
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const struct sock *sk,
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u32 sid)
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{
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struct sk_security_struct *sksec = sk->sk_security;
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struct netlbl_lsm_secattr *secattr = sksec->nlbl_secattr;
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if (secattr == NULL)
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return NULL;
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if ((secattr->flags & NETLBL_SECATTR_SECID) &&
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(secattr->attr.secid == sid))
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return secattr;
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return NULL;
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}
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/**
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* selinux_netlbl_cache_invalidate - Invalidate the NetLabel cache
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*
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* Description:
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* Invalidate the NetLabel security attribute mapping cache.
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*
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*/
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void selinux_netlbl_cache_invalidate(void)
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{
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netlbl_cache_invalidate();
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}
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/**
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* selinux_netlbl_err - Handle a NetLabel packet error
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* @skb: the packet
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* @family: the packet's address family
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* @error: the error code
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* @gateway: true if host is acting as a gateway, false otherwise
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*
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* Description:
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* When a packet is dropped due to a call to avc_has_perm() pass the error
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* code to the NetLabel subsystem so any protocol specific processing can be
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* done. This is safe to call even if you are unsure if NetLabel labeling is
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* present on the packet, NetLabel is smart enough to only act when it should.
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*
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*/
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void selinux_netlbl_err(struct sk_buff *skb, u16 family, int error, int gateway)
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{
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netlbl_skbuff_err(skb, family, error, gateway);
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}
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/**
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* selinux_netlbl_sk_security_free - Free the NetLabel fields
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* @sksec: the sk_security_struct
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*
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* Description:
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* Free all of the memory in the NetLabel fields of a sk_security_struct.
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*
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*/
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void selinux_netlbl_sk_security_free(struct sk_security_struct *sksec)
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{
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if (sksec->nlbl_secattr != NULL)
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netlbl_secattr_free(sksec->nlbl_secattr);
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}
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/**
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* selinux_netlbl_sk_security_reset - Reset the NetLabel fields
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* @sksec: the sk_security_struct
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*
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* Description:
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* Called when the NetLabel state of a sk_security_struct needs to be reset.
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* The caller is responsible for all the NetLabel sk_security_struct locking.
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*
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*/
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void selinux_netlbl_sk_security_reset(struct sk_security_struct *sksec)
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{
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sksec->nlbl_state = NLBL_UNSET;
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}
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/**
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* selinux_netlbl_skbuff_getsid - Get the sid of a packet using NetLabel
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* @skb: the packet
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* @family: protocol family
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* @type: NetLabel labeling protocol type
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* @sid: the SID
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*
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* Description:
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* Call the NetLabel mechanism to get the security attributes of the given
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* packet and use those attributes to determine the correct context/SID to
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* assign to the packet. Returns zero on success, negative values on failure.
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*
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*/
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int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
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u16 family,
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u32 *type,
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u32 *sid)
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{
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int rc;
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struct netlbl_lsm_secattr secattr;
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if (!netlbl_enabled()) {
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*sid = SECSID_NULL;
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return 0;
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}
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netlbl_secattr_init(&secattr);
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rc = netlbl_skbuff_getattr(skb, family, &secattr);
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if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE)
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rc = selinux_netlbl_sidlookup_cached(skb, family,
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&secattr, sid);
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else
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*sid = SECSID_NULL;
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*type = secattr.type;
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netlbl_secattr_destroy(&secattr);
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return rc;
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}
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/**
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* selinux_netlbl_skbuff_setsid - Set the NetLabel on a packet given a sid
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* @skb: the packet
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* @family: protocol family
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* @sid: the SID
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*
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* Description
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* Call the NetLabel mechanism to set the label of a packet using @sid.
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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 selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
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u16 family,
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u32 sid)
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{
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int rc;
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struct netlbl_lsm_secattr secattr_storage;
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struct netlbl_lsm_secattr *secattr = NULL;
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struct sock *sk;
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/* if this is a locally generated packet check to see if it is already
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* being labeled by it's parent socket, if it is just exit */
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sk = skb_to_full_sk(skb);
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if (sk != NULL) {
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struct sk_security_struct *sksec = sk->sk_security;
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if (sksec->nlbl_state != NLBL_REQSKB)
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return 0;
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secattr = selinux_netlbl_sock_getattr(sk, sid);
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}
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if (secattr == NULL) {
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secattr = &secattr_storage;
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netlbl_secattr_init(secattr);
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rc = security_netlbl_sid_to_secattr(&selinux_state, sid,
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secattr);
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if (rc != 0)
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goto skbuff_setsid_return;
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}
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rc = netlbl_skbuff_setattr(skb, family, secattr);
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skbuff_setsid_return:
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if (secattr == &secattr_storage)
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netlbl_secattr_destroy(secattr);
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return rc;
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}
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/**
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* selinux_netlbl_sctp_assoc_request - Label an incoming sctp association.
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* @asoc: incoming association.
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* @skb: the packet.
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*
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* Description:
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* A new incoming connection is represented by @asoc, ......
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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 selinux_netlbl_sctp_assoc_request(struct sctp_association *asoc,
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struct sk_buff *skb)
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{
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int rc;
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struct netlbl_lsm_secattr secattr;
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struct sk_security_struct *sksec = asoc->base.sk->sk_security;
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struct sockaddr_in addr4;
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struct sockaddr_in6 addr6;
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if (asoc->base.sk->sk_family != PF_INET &&
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asoc->base.sk->sk_family != PF_INET6)
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return 0;
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netlbl_secattr_init(&secattr);
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rc = security_netlbl_sid_to_secattr(&selinux_state,
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asoc->secid, &secattr);
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if (rc != 0)
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goto assoc_request_return;
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/* Move skb hdr address info to a struct sockaddr and then call
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* netlbl_conn_setattr().
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*/
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if (ip_hdr(skb)->version == 4) {
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addr4.sin_family = AF_INET;
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addr4.sin_addr.s_addr = ip_hdr(skb)->saddr;
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rc = netlbl_conn_setattr(asoc->base.sk, (void *)&addr4, &secattr);
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} else if (IS_ENABLED(CONFIG_IPV6) && ip_hdr(skb)->version == 6) {
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addr6.sin6_family = AF_INET6;
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addr6.sin6_addr = ipv6_hdr(skb)->saddr;
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rc = netlbl_conn_setattr(asoc->base.sk, (void *)&addr6, &secattr);
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} else {
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rc = -EAFNOSUPPORT;
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}
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if (rc == 0)
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sksec->nlbl_state = NLBL_LABELED;
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assoc_request_return:
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netlbl_secattr_destroy(&secattr);
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return rc;
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}
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/**
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* selinux_netlbl_inet_conn_request - Label an incoming stream connection
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* @req: incoming connection request socket
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* @family: the request socket's address family
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*
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* Description:
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* A new incoming connection request is represented by @req, we need to label
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* the new request_sock here and the stack will ensure the on-the-wire label
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* will get preserved when a full sock is created once the connection handshake
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* is complete. Returns zero on success, negative values on failure.
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*
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*/
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int selinux_netlbl_inet_conn_request(struct request_sock *req, u16 family)
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{
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int rc;
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struct netlbl_lsm_secattr secattr;
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if (family != PF_INET && family != PF_INET6)
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return 0;
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netlbl_secattr_init(&secattr);
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rc = security_netlbl_sid_to_secattr(&selinux_state, req->secid,
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&secattr);
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if (rc != 0)
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goto inet_conn_request_return;
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rc = netlbl_req_setattr(req, &secattr);
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inet_conn_request_return:
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netlbl_secattr_destroy(&secattr);
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return rc;
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}
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/**
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* selinux_netlbl_inet_csk_clone - Initialize the newly created sock
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* @sk: the new sock
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* @family: the sock's address family
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*
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* Description:
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* A new connection has been established using @sk, we've already labeled the
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* socket via the request_sock struct in selinux_netlbl_inet_conn_request() but
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* we need to set the NetLabel state here since we now have a sock structure.
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*
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*/
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void selinux_netlbl_inet_csk_clone(struct sock *sk, u16 family)
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{
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struct sk_security_struct *sksec = sk->sk_security;
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if (family == PF_INET)
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sksec->nlbl_state = NLBL_LABELED;
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else
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sksec->nlbl_state = NLBL_UNSET;
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}
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/**
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* selinux_netlbl_sctp_sk_clone - Copy state to the newly created sock
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* @sk: current sock
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* @newsk: the new sock
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*
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* Description:
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* Called whenever a new socket is created by accept(2) or sctp_peeloff(3).
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*/
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|
|
void selinux_netlbl_sctp_sk_clone(struct sock *sk, struct sock *newsk)
|
||
|
|
{
|
||
|
|
struct sk_security_struct *sksec = sk->sk_security;
|
||
|
|
struct sk_security_struct *newsksec = newsk->sk_security;
|
||
|
|
|
||
|
|
newsksec->nlbl_state = sksec->nlbl_state;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* selinux_netlbl_socket_post_create - Label a socket using NetLabel
|
||
|
|
* @sk: the sock to label
|
||
|
|
* @family: protocol family
|
||
|
|
*
|
||
|
|
* Description:
|
||
|
|
* Attempt to label a socket using the NetLabel mechanism using the given
|
||
|
|
* SID. Returns zero values on success, negative values on failure.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
int selinux_netlbl_socket_post_create(struct sock *sk, u16 family)
|
||
|
|
{
|
||
|
|
int rc;
|
||
|
|
struct sk_security_struct *sksec = sk->sk_security;
|
||
|
|
struct netlbl_lsm_secattr *secattr;
|
||
|
|
|
||
|
|
if (family != PF_INET && family != PF_INET6)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
secattr = selinux_netlbl_sock_genattr(sk);
|
||
|
|
if (secattr == NULL)
|
||
|
|
return -ENOMEM;
|
||
|
|
rc = netlbl_sock_setattr(sk, family, secattr);
|
||
|
|
switch (rc) {
|
||
|
|
case 0:
|
||
|
|
sksec->nlbl_state = NLBL_LABELED;
|
||
|
|
break;
|
||
|
|
case -EDESTADDRREQ:
|
||
|
|
sksec->nlbl_state = NLBL_REQSKB;
|
||
|
|
rc = 0;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* selinux_netlbl_sock_rcv_skb - Do an inbound access check using NetLabel
|
||
|
|
* @sksec: the sock's sk_security_struct
|
||
|
|
* @skb: the packet
|
||
|
|
* @family: protocol family
|
||
|
|
* @ad: the audit data
|
||
|
|
*
|
||
|
|
* Description:
|
||
|
|
* Fetch the NetLabel security attributes from @skb and perform an access check
|
||
|
|
* against the receiving socket. Returns zero on success, negative values on
|
||
|
|
* error.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
|
||
|
|
struct sk_buff *skb,
|
||
|
|
u16 family,
|
||
|
|
struct common_audit_data *ad)
|
||
|
|
{
|
||
|
|
int rc;
|
||
|
|
u32 nlbl_sid;
|
||
|
|
u32 perm;
|
||
|
|
struct netlbl_lsm_secattr secattr;
|
||
|
|
|
||
|
|
if (!netlbl_enabled())
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
netlbl_secattr_init(&secattr);
|
||
|
|
rc = netlbl_skbuff_getattr(skb, family, &secattr);
|
||
|
|
if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE)
|
||
|
|
rc = selinux_netlbl_sidlookup_cached(skb, family,
|
||
|
|
&secattr, &nlbl_sid);
|
||
|
|
else
|
||
|
|
nlbl_sid = SECINITSID_UNLABELED;
|
||
|
|
netlbl_secattr_destroy(&secattr);
|
||
|
|
if (rc != 0)
|
||
|
|
return rc;
|
||
|
|
|
||
|
|
switch (sksec->sclass) {
|
||
|
|
case SECCLASS_UDP_SOCKET:
|
||
|
|
perm = UDP_SOCKET__RECVFROM;
|
||
|
|
break;
|
||
|
|
case SECCLASS_TCP_SOCKET:
|
||
|
|
perm = TCP_SOCKET__RECVFROM;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
perm = RAWIP_SOCKET__RECVFROM;
|
||
|
|
}
|
||
|
|
|
||
|
|
rc = avc_has_perm(&selinux_state,
|
||
|
|
sksec->sid, nlbl_sid, sksec->sclass, perm, ad);
|
||
|
|
if (rc == 0)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
if (nlbl_sid != SECINITSID_UNLABELED)
|
||
|
|
netlbl_skbuff_err(skb, family, rc, 0);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* selinux_netlbl_option - Is this a NetLabel option
|
||
|
|
* @level: the socket level or protocol
|
||
|
|
* @optname: the socket option name
|
||
|
|
*
|
||
|
|
* Description:
|
||
|
|
* Returns true if @level and @optname refer to a NetLabel option.
|
||
|
|
* Helper for selinux_netlbl_socket_setsockopt().
|
||
|
|
*/
|
||
|
|
static inline int selinux_netlbl_option(int level, int optname)
|
||
|
|
{
|
||
|
|
return (level == IPPROTO_IP && optname == IP_OPTIONS) ||
|
||
|
|
(level == IPPROTO_IPV6 && optname == IPV6_HOPOPTS);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* selinux_netlbl_socket_setsockopt - Do not allow users to remove a NetLabel
|
||
|
|
* @sock: the socket
|
||
|
|
* @level: the socket level or protocol
|
||
|
|
* @optname: the socket option name
|
||
|
|
*
|
||
|
|
* Description:
|
||
|
|
* Check the setsockopt() call and if the user is trying to replace the IP
|
||
|
|
* options on a socket and a NetLabel is in place for the socket deny the
|
||
|
|
* access; otherwise allow the access. Returns zero when the access is
|
||
|
|
* allowed, -EACCES when denied, and other negative values on error.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
int selinux_netlbl_socket_setsockopt(struct socket *sock,
|
||
|
|
int level,
|
||
|
|
int optname)
|
||
|
|
{
|
||
|
|
int rc = 0;
|
||
|
|
struct sock *sk = sock->sk;
|
||
|
|
struct sk_security_struct *sksec = sk->sk_security;
|
||
|
|
struct netlbl_lsm_secattr secattr;
|
||
|
|
|
||
|
|
if (selinux_netlbl_option(level, optname) &&
|
||
|
|
(sksec->nlbl_state == NLBL_LABELED ||
|
||
|
|
sksec->nlbl_state == NLBL_CONNLABELED)) {
|
||
|
|
netlbl_secattr_init(&secattr);
|
||
|
|
lock_sock(sk);
|
||
|
|
/* call the netlabel function directly as we want to see the
|
||
|
|
* on-the-wire label that is assigned via the socket's options
|
||
|
|
* and not the cached netlabel/lsm attributes */
|
||
|
|
rc = netlbl_sock_getattr(sk, &secattr);
|
||
|
|
release_sock(sk);
|
||
|
|
if (rc == 0)
|
||
|
|
rc = -EACCES;
|
||
|
|
else if (rc == -ENOMSG)
|
||
|
|
rc = 0;
|
||
|
|
netlbl_secattr_destroy(&secattr);
|
||
|
|
}
|
||
|
|
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* selinux_netlbl_socket_connect_helper - Help label a client-side socket on
|
||
|
|
* connect
|
||
|
|
* @sk: the socket to label
|
||
|
|
* @addr: the destination address
|
||
|
|
*
|
||
|
|
* Description:
|
||
|
|
* Attempt to label a connected socket with NetLabel using the given address.
|
||
|
|
* Returns zero values on success, negative values on failure.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
static int selinux_netlbl_socket_connect_helper(struct sock *sk,
|
||
|
|
struct sockaddr *addr)
|
||
|
|
{
|
||
|
|
int rc;
|
||
|
|
struct sk_security_struct *sksec = sk->sk_security;
|
||
|
|
struct netlbl_lsm_secattr *secattr;
|
||
|
|
|
||
|
|
/* connected sockets are allowed to disconnect when the address family
|
||
|
|
* is set to AF_UNSPEC, if that is what is happening we want to reset
|
||
|
|
* the socket */
|
||
|
|
if (addr->sa_family == AF_UNSPEC) {
|
||
|
|
netlbl_sock_delattr(sk);
|
||
|
|
sksec->nlbl_state = NLBL_REQSKB;
|
||
|
|
rc = 0;
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
secattr = selinux_netlbl_sock_genattr(sk);
|
||
|
|
if (secattr == NULL) {
|
||
|
|
rc = -ENOMEM;
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
rc = netlbl_conn_setattr(sk, addr, secattr);
|
||
|
|
if (rc == 0)
|
||
|
|
sksec->nlbl_state = NLBL_CONNLABELED;
|
||
|
|
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* selinux_netlbl_socket_connect_locked - Label a client-side socket on
|
||
|
|
* connect
|
||
|
|
* @sk: the socket to label
|
||
|
|
* @addr: the destination address
|
||
|
|
*
|
||
|
|
* Description:
|
||
|
|
* Attempt to label a connected socket that already has the socket locked
|
||
|
|
* with NetLabel using the given address.
|
||
|
|
* Returns zero values on success, negative values on failure.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
int selinux_netlbl_socket_connect_locked(struct sock *sk,
|
||
|
|
struct sockaddr *addr)
|
||
|
|
{
|
||
|
|
struct sk_security_struct *sksec = sk->sk_security;
|
||
|
|
|
||
|
|
if (sksec->nlbl_state != NLBL_REQSKB &&
|
||
|
|
sksec->nlbl_state != NLBL_CONNLABELED)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return selinux_netlbl_socket_connect_helper(sk, addr);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* selinux_netlbl_socket_connect - Label a client-side socket on connect
|
||
|
|
* @sk: the socket to label
|
||
|
|
* @addr: the destination address
|
||
|
|
*
|
||
|
|
* Description:
|
||
|
|
* Attempt to label a connected socket with NetLabel using the given address.
|
||
|
|
* Returns zero values on success, negative values on failure.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
int selinux_netlbl_socket_connect(struct sock *sk, struct sockaddr *addr)
|
||
|
|
{
|
||
|
|
int rc;
|
||
|
|
|
||
|
|
lock_sock(sk);
|
||
|
|
rc = selinux_netlbl_socket_connect_locked(sk, addr);
|
||
|
|
release_sock(sk);
|
||
|
|
|
||
|
|
return rc;
|
||
|
|
}
|