2320 lines
57 KiB
C
2320 lines
57 KiB
C
/* $NetBSD: ipsec.c,v 1.34 2007/10/28 15:48:23 adrianp Exp $ */
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/* $FreeBSD: /usr/local/www/cvsroot/FreeBSD/src/sys/netipsec/ipsec.c,v 1.2.2.2 2003/07/01 01:38:13 sam Exp $ */
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/* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ipsec.c,v 1.34 2007/10/28 15:48:23 adrianp Exp $");
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/*
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* IPsec controller part.
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*/
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#include "opt_inet.h"
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#ifdef __FreeBSD__
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#include "opt_inet6.h"
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#endif
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#include "opt_ipsec.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/syslog.h>
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#include <sys/sysctl.h>
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#include <sys/proc.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/in_var.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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#include <netinet/ip6.h>
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#ifdef INET6
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#include <netinet6/ip6_var.h>
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#endif
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#include <netinet/in_pcb.h>
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#ifdef INET6
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#include <netinet6/in6_pcb.h>
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#include <netinet/icmp6.h>
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#endif
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#include <netipsec/ipsec.h>
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#include <netipsec/ipsec_var.h>
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#ifdef INET6
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#include <netipsec/ipsec6.h>
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#endif
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#include <netipsec/ah_var.h>
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#include <netipsec/esp_var.h>
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#include <netipsec/ipcomp.h> /*XXX*/
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#include <netipsec/ipcomp_var.h>
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#include <netipsec/key.h>
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#include <netipsec/keydb.h>
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#include <netipsec/key_debug.h>
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#include <netipsec/xform.h>
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#include <netipsec/ipsec_osdep.h>
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#include <net/net_osdep.h>
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#ifdef IPSEC_DEBUG
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int ipsec_debug = 1;
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/*
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* When set to 1, IPsec will send packets with the same sequence number.
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* This allows to verify if the other side has proper replay attacks detection.
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*/
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int ipsec_replay = 0;
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/*
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* When set 1, IPsec will send packets with corrupted HMAC.
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* This allows to verify if the other side properly detects modified packets.
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*/
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int ipsec_integrity = 0;
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#else
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int ipsec_debug = 0;
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#endif
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/* NB: name changed so netstat doesn't use it */
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struct newipsecstat newipsecstat;
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int ip4_ah_offsetmask = 0; /* maybe IP_DF? */
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int ip4_ipsec_dfbit = 2; /* DF bit on encap. 0: clear 1: set 2: copy */
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int ip4_esp_trans_deflev = IPSEC_LEVEL_USE;
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int ip4_esp_net_deflev = IPSEC_LEVEL_USE;
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int ip4_ah_trans_deflev = IPSEC_LEVEL_USE;
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int ip4_ah_net_deflev = IPSEC_LEVEL_USE;
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struct secpolicy ip4_def_policy;
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int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
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int ip4_esp_randpad = -1;
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#ifdef __NetBSD__
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u_int ipsec_spdgen = 1; /* SPD generation # */
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static struct secpolicy *ipsec_checkpcbcache (struct mbuf *,
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struct inpcbpolicy *, int);
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static int ipsec_fillpcbcache (struct inpcbpolicy *, struct mbuf *,
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struct secpolicy *, int);
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static int ipsec_invalpcbcache (struct inpcbpolicy *, int);
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#endif /* __NetBSD__ */
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/*
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* Crypto support requirements:
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*
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* 1 require hardware support
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* -1 require software support
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* 0 take anything
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*/
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int crypto_support = 0;
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static struct secpolicy *ipsec_getpolicybysock(struct mbuf *, u_int,
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PCB_T *, int *);
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#ifdef __FreeBSD__
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SYSCTL_DECL(_net_inet_ipsec);
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/* net.inet.ipsec */
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY,
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def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
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CTLFLAG_RW, &ip4_esp_trans_deflev, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
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CTLFLAG_RW, &ip4_esp_net_deflev, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
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CTLFLAG_RW, &ip4_ah_trans_deflev, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
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CTLFLAG_RW, &ip4_ah_net_deflev, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS,
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ah_cleartos, CTLFLAG_RW, &ip4_ah_cleartos, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK,
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ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT,
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dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN,
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ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG,
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debug, CTLFLAG_RW, &ipsec_debug, 0, "");
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SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD,
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esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, "");
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SYSCTL_INT(_net_inet_ipsec, OID_AUTO,
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crypto_support, CTLFLAG_RW, &crypto_support,0, "");
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SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO,
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ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, "");
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SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay, CTLFLAG_RW, &ipsec_replay, 0,
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"Emulate replay attack");
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SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity, CTLFLAG_RW,
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&ipsec_integrity, 0, "Emulate man-in-the-middle attack");
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#endif /* __FreeBSD__ */
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#ifdef INET6
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int ip6_esp_trans_deflev = IPSEC_LEVEL_USE;
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int ip6_esp_net_deflev = IPSEC_LEVEL_USE;
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int ip6_ah_trans_deflev = IPSEC_LEVEL_USE;
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int ip6_ah_net_deflev = IPSEC_LEVEL_USE;
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struct secpolicy ip6_def_policy;
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int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
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int ip6_esp_randpad = -1;
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#ifdef __FreeBSD__
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SYSCTL_DECL(_net_inet6_ipsec6);
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/* net.inet6.ipsec6 */
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#ifdef COMPAT_KAME
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SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD,
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0,0, compat_ipsecstats_sysctl, "S", "");
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#endif /* COMPAT_KAME */
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SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY,
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def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
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SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
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CTLFLAG_RW, &ip6_esp_trans_deflev, 0, "");
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SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
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CTLFLAG_RW, &ip6_esp_net_deflev, 0, "");
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SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
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CTLFLAG_RW, &ip6_ah_trans_deflev, 0, "");
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SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
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CTLFLAG_RW, &ip6_ah_net_deflev, 0, "");
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SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN,
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ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, "");
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SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG,
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debug, CTLFLAG_RW, &ipsec_debug, 0, "");
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SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD,
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esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, "");
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#endif /* INET6 */
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#endif /* __FreeBSD__ */
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static int ipsec4_setspidx_inpcb (struct mbuf *, struct inpcb *);
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#ifdef INET6
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static int ipsec6_setspidx_in6pcb (struct mbuf *, struct in6pcb *);
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#endif
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static int ipsec_setspidx (struct mbuf *, struct secpolicyindex *, int);
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static void ipsec4_get_ulp (struct mbuf *m, struct secpolicyindex *, int);
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static int ipsec4_setspidx_ipaddr (struct mbuf *, struct secpolicyindex *);
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#ifdef INET6
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static void ipsec6_get_ulp (struct mbuf *m, struct secpolicyindex *, int);
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static int ipsec6_setspidx_ipaddr (struct mbuf *, struct secpolicyindex *);
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#endif
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static void ipsec_delpcbpolicy (struct inpcbpolicy *);
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static struct secpolicy *ipsec_deepcopy_policy (struct secpolicy *);
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static int ipsec_set_policy (struct secpolicy **,int , void *, size_t , int );
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static int ipsec_get_policy (struct secpolicy *, struct mbuf **);
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static void vshiftl (unsigned char *, int, int);
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static size_t ipsec_hdrsiz (struct secpolicy *);
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#ifdef __NetBSD__
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/*
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* Try to validate and use cached policy on a PCB.
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*/
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static struct secpolicy *
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ipsec_checkpcbcache(struct mbuf *m, struct inpcbpolicy *pcbsp, int dir)
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{
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struct secpolicyindex spidx;
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switch (dir) {
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case IPSEC_DIR_INBOUND:
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case IPSEC_DIR_OUTBOUND:
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case IPSEC_DIR_ANY:
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break;
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default:
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return NULL;
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}
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#ifdef DIAGNOSTIC
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if (pcbsp == NULL) {
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printf("ipsec_checkpcbcache: NULL pcbsp\n");
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/* XXX panic? */
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return NULL;
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}
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#endif
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#ifdef DIAGNOSTIC
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if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0]))
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panic("dir too big in ipsec_checkpcbcache");
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#endif
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/* SPD table change invalidate all the caches. */
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if (ipsec_spdgen != pcbsp->sp_cache[dir].cachegen) {
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ipsec_invalpcbcache(pcbsp, dir);
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return NULL;
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}
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if (!pcbsp->sp_cache[dir].cachesp)
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return NULL;
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if (pcbsp->sp_cache[dir].cachesp->state != IPSEC_SPSTATE_ALIVE) {
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ipsec_invalpcbcache(pcbsp, dir);
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return NULL;
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}
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if ((pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) == 0) {
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if (!pcbsp->sp_cache[dir].cachesp)
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return NULL;
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if (ipsec_setspidx(m, &spidx, 1) != 0)
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return NULL;
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/*
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* We have to make an exact match here since the cached rule
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* might have lower priority than a rule that would otherwise
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* have matched the packet.
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*/
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if (bcmp(&pcbsp->sp_cache[dir].cacheidx, &spidx, sizeof(spidx)))
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return NULL;
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} else {
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/*
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* The pcb is connected, and the L4 code is sure that:
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* - outgoing side uses inp_[lf]addr
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* - incoming side looks up policy after inpcb lookup
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* and address pair is know to be stable. We do not need
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* to generate spidx again, nor check the address match again.
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*
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* For IPv4/v6 SOCK_STREAM sockets, this assumptions holds
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* and there are calls to ipsec_pcbconn() from in_pcbconnect().
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*/
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}
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pcbsp->sp_cache[dir].cachesp->lastused = time_second;
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pcbsp->sp_cache[dir].cachesp->refcnt++;
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KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
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printf("DP ipsec_checkpcbcache cause refcnt++:%d SP:%p\n",
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pcbsp->sp_cache[dir].cachesp->refcnt,
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pcbsp->sp_cache[dir].cachesp));
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return pcbsp->sp_cache[dir].cachesp;
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}
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static int
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ipsec_fillpcbcache(struct inpcbpolicy *pcbsp, struct mbuf *m,
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struct secpolicy *sp, int dir)
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{
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switch (dir) {
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case IPSEC_DIR_INBOUND:
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case IPSEC_DIR_OUTBOUND:
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break;
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default:
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return EINVAL;
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}
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#ifdef DIAGNOSTIC
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if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0]))
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panic("dir too big in ipsec_fillpcbcache");
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#endif
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if (pcbsp->sp_cache[dir].cachesp)
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KEY_FREESP(&pcbsp->sp_cache[dir].cachesp);
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pcbsp->sp_cache[dir].cachesp = NULL;
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pcbsp->sp_cache[dir].cachehint = IPSEC_PCBHINT_MAYBE;
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if (ipsec_setspidx(m, &pcbsp->sp_cache[dir].cacheidx, 1) != 0) {
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return EINVAL;
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}
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pcbsp->sp_cache[dir].cachesp = sp;
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if (pcbsp->sp_cache[dir].cachesp) {
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pcbsp->sp_cache[dir].cachesp->refcnt++;
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KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
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printf("DP ipsec_fillpcbcache cause refcnt++:%d SP:%p\n",
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pcbsp->sp_cache[dir].cachesp->refcnt,
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pcbsp->sp_cache[dir].cachesp));
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/*
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* If the PCB is connected, we can remember a hint to
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* possibly short-circuit IPsec processing in other places.
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*/
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if (pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) {
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switch (pcbsp->sp_cache[dir].cachesp->policy) {
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case IPSEC_POLICY_NONE:
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case IPSEC_POLICY_BYPASS:
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pcbsp->sp_cache[dir].cachehint =
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IPSEC_PCBHINT_NO;
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break;
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default:
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pcbsp->sp_cache[dir].cachehint =
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IPSEC_PCBHINT_YES;
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}
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}
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}
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pcbsp->sp_cache[dir].cachegen = ipsec_spdgen;
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return 0;
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}
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static int
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ipsec_invalpcbcache(struct inpcbpolicy *pcbsp, int dir)
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{
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int i;
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for (i = IPSEC_DIR_INBOUND; i <= IPSEC_DIR_OUTBOUND; i++) {
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if (dir != IPSEC_DIR_ANY && i != dir)
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continue;
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if (pcbsp->sp_cache[i].cachesp)
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KEY_FREESP(&pcbsp->sp_cache[i].cachesp);
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pcbsp->sp_cache[i].cachesp = NULL;
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pcbsp->sp_cache[i].cachehint = IPSEC_PCBHINT_MAYBE;
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pcbsp->sp_cache[i].cachegen = 0;
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bzero(&pcbsp->sp_cache[i].cacheidx,
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sizeof(pcbsp->sp_cache[i].cacheidx));
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}
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return 0;
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}
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void
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ipsec_pcbconn(struct inpcbpolicy *pcbsp)
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{
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pcbsp->sp_cacheflags |= IPSEC_PCBSP_CONNECTED;
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ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY);
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}
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void
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ipsec_pcbdisconn(struct inpcbpolicy *pcbsp)
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{
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pcbsp->sp_cacheflags &= ~IPSEC_PCBSP_CONNECTED;
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ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY);
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}
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void
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ipsec_invalpcbcacheall(void)
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{
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if (ipsec_spdgen == UINT_MAX)
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ipsec_spdgen = 1;
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else
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ipsec_spdgen++;
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}
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#endif /* __NetBSD__ */
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/*
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* Return a held reference to the default SP.
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*/
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static struct secpolicy *
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key_allocsp_default(int af, const char* where, int tag)
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{
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struct secpolicy *sp;
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KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
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printf("DP key_allocsp_default from %s:%u\n", where, tag));
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switch(af) {
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case AF_INET:
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sp = &ip4_def_policy;
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break;
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#ifdef INET6
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|
case AF_INET6:
|
|
sp = &ip6_def_policy;
|
|
break;
|
|
#endif
|
|
default:
|
|
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
|
|
printf("key_allocsp_default : unexpected protocol family %u\n",
|
|
af));
|
|
return NULL;
|
|
}
|
|
|
|
if (sp->policy != IPSEC_POLICY_DISCARD &&
|
|
sp->policy != IPSEC_POLICY_NONE) {
|
|
ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n",
|
|
sp->policy, IPSEC_POLICY_NONE));
|
|
sp->policy = IPSEC_POLICY_NONE;
|
|
}
|
|
sp->refcnt++;
|
|
|
|
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
|
|
printf("DP key_allocsp_default returns SP:%p (%u)\n",
|
|
sp, sp->refcnt));
|
|
return sp;
|
|
}
|
|
#define KEY_ALLOCSP_DEFAULT(af) \
|
|
key_allocsp_default((af),__FILE__, __LINE__)
|
|
|
|
/*
|
|
* For OUTBOUND packet having a socket. Searching SPD for packet,
|
|
* and return a pointer to SP.
|
|
* OUT: NULL: no apropreate SP found, the following value is set to error.
|
|
* 0 : bypass
|
|
* EACCES : discard packet.
|
|
* ENOENT : ipsec_acquire() in progress, maybe.
|
|
* others : error occurred.
|
|
* others: a pointer to SP
|
|
*
|
|
* NOTE: IPv6 mapped address concern is implemented here.
|
|
*/
|
|
struct secpolicy *
|
|
ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir)
|
|
{
|
|
struct secpolicy *sp;
|
|
|
|
IPSEC_ASSERT(tdbi != NULL, ("ipsec_getpolicy: null tdbi"));
|
|
IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
|
|
("ipsec_getpolicy: invalid direction %u", dir));
|
|
|
|
sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir);
|
|
if (sp == NULL) /*XXX????*/
|
|
sp = KEY_ALLOCSP_DEFAULT(tdbi->dst.sa.sa_family);
|
|
IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicy: null SP"));
|
|
return sp;
|
|
}
|
|
|
|
/*
|
|
* For OUTBOUND packet having a socket. Searching SPD for packet,
|
|
* and return a pointer to SP.
|
|
* OUT: NULL: no apropreate SP found, the following value is set to error.
|
|
* 0 : bypass
|
|
* EACCES : discard packet.
|
|
* ENOENT : ipsec_acquire() in progress, maybe.
|
|
* others : error occurred.
|
|
* others: a pointer to SP
|
|
*
|
|
* NOTE: IPv6 mapped address concern is implemented here.
|
|
*/
|
|
static struct secpolicy *
|
|
ipsec_getpolicybysock(struct mbuf *m, u_int dir, PCB_T *inp, int *error)
|
|
{
|
|
struct inpcbpolicy *pcbsp = NULL;
|
|
struct secpolicy *currsp = NULL; /* policy on socket */
|
|
struct secpolicy *sp;
|
|
int af;
|
|
|
|
IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf"));
|
|
IPSEC_ASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb"));
|
|
IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybysock: null error"));
|
|
IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
|
|
("ipsec_getpolicybysock: invalid direction %u", dir));
|
|
|
|
IPSEC_ASSERT(PCB_SOCKET(inp) != NULL,
|
|
("ipsec_getppolicybysock: null socket\n"));
|
|
|
|
/* XXX FIXME inpcb/in6pcb vs socket*/
|
|
af = PCB_FAMILY(inp);
|
|
IPSEC_ASSERT(af == AF_INET || af == AF_INET6,
|
|
("ipsec_getpolicybysock: unexpected protocol family %u", af));
|
|
|
|
#ifdef __NetBSD__
|
|
IPSEC_ASSERT(inp->inph_sp != NULL, ("null PCB policy cache"));
|
|
/* If we have a cached entry, and if it is still valid, use it. */
|
|
ipsecstat.ips_spdcache_lookup++;
|
|
currsp = ipsec_checkpcbcache(m, /*inpcb_hdr*/inp->inph_sp, dir);
|
|
if (currsp) {
|
|
*error = 0;
|
|
return currsp;
|
|
}
|
|
ipsecstat.ips_spdcache_miss++;
|
|
#endif /* __NetBSD__ */
|
|
|
|
switch (af) {
|
|
case AF_INET: {
|
|
struct inpcb *in4p = PCB_TO_IN4PCB(inp);
|
|
/* set spidx in pcb */
|
|
*error = ipsec4_setspidx_inpcb(m, in4p);
|
|
pcbsp = in4p->inp_sp;
|
|
break;
|
|
}
|
|
|
|
#if defined(INET6)
|
|
case AF_INET6: {
|
|
struct in6pcb *in6p = PCB_TO_IN6PCB(inp);
|
|
/* set spidx in pcb */
|
|
*error = ipsec6_setspidx_in6pcb(m, in6p);
|
|
pcbsp = in6p->in6p_sp;
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
*error = EPFNOSUPPORT;
|
|
break;
|
|
}
|
|
if (*error)
|
|
return NULL;
|
|
|
|
IPSEC_ASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp"));
|
|
switch (dir) {
|
|
case IPSEC_DIR_INBOUND:
|
|
currsp = pcbsp->sp_in;
|
|
break;
|
|
case IPSEC_DIR_OUTBOUND:
|
|
currsp = pcbsp->sp_out;
|
|
break;
|
|
}
|
|
IPSEC_ASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp"));
|
|
|
|
if (pcbsp->priv) { /* when privilieged socket */
|
|
switch (currsp->policy) {
|
|
case IPSEC_POLICY_BYPASS:
|
|
case IPSEC_POLICY_IPSEC:
|
|
currsp->refcnt++;
|
|
sp = currsp;
|
|
break;
|
|
|
|
case IPSEC_POLICY_ENTRUST:
|
|
/* look for a policy in SPD */
|
|
sp = KEY_ALLOCSP(&currsp->spidx, dir);
|
|
if (sp == NULL) /* no SP found */
|
|
sp = KEY_ALLOCSP_DEFAULT(af);
|
|
break;
|
|
|
|
default:
|
|
ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
|
|
"Invalid policy for PCB %d\n", currsp->policy));
|
|
*error = EINVAL;
|
|
return NULL;
|
|
}
|
|
} else { /* unpriv, SPD has policy */
|
|
sp = KEY_ALLOCSP(&currsp->spidx, dir);
|
|
if (sp == NULL) { /* no SP found */
|
|
switch (currsp->policy) {
|
|
case IPSEC_POLICY_BYPASS:
|
|
ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
|
|
"Illegal policy for non-priviliged defined %d\n",
|
|
currsp->policy));
|
|
*error = EINVAL;
|
|
return NULL;
|
|
|
|
case IPSEC_POLICY_ENTRUST:
|
|
sp = KEY_ALLOCSP_DEFAULT(af);
|
|
break;
|
|
|
|
case IPSEC_POLICY_IPSEC:
|
|
currsp->refcnt++;
|
|
sp = currsp;
|
|
break;
|
|
|
|
default:
|
|
ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
|
|
"Invalid policy for PCB %d\n", currsp->policy));
|
|
*error = EINVAL;
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
IPSEC_ASSERT(sp != NULL,
|
|
("ipsec_getpolicybysock: null SP (priv %u policy %u",
|
|
pcbsp->priv, currsp->policy));
|
|
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
|
|
printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates "
|
|
"SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy,
|
|
sp, sp->refcnt));
|
|
#ifdef __NetBSD__
|
|
ipsec_fillpcbcache(pcbsp, m, sp, dir);
|
|
#endif /* __NetBSD__ */
|
|
return sp;
|
|
}
|
|
|
|
/*
|
|
* For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
|
|
* and return a pointer to SP.
|
|
* OUT: positive: a pointer to the entry for security policy leaf matched.
|
|
* NULL: no apropreate SP found, the following value is set to error.
|
|
* 0 : bypass
|
|
* EACCES : discard packet.
|
|
* ENOENT : ipsec_acquire() in progress, maybe.
|
|
* others : error occurred.
|
|
*/
|
|
struct secpolicy *
|
|
ipsec_getpolicybyaddr(struct mbuf *m, u_int dir, int flag, int *error)
|
|
{
|
|
struct secpolicyindex spidx;
|
|
struct secpolicy *sp;
|
|
|
|
IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf"));
|
|
IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error"));
|
|
IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
|
|
("ipsec4_getpolicybaddr: invalid direction %u", dir));
|
|
|
|
sp = NULL;
|
|
|
|
/* Make an index to look for a policy. */
|
|
*error = ipsec_setspidx(m, &spidx, (flag & IP_FORWARDING) ? 0 : 1);
|
|
if (*error != 0) {
|
|
DPRINTF(("ipsec_getpolicybyaddr: setpidx failed,"
|
|
" dir %u flag %u\n", dir, flag));
|
|
bzero(&spidx, sizeof (spidx));
|
|
return NULL;
|
|
}
|
|
|
|
spidx.dir = dir;
|
|
|
|
if (key_havesp(dir)) {
|
|
sp = KEY_ALLOCSP(&spidx, dir);
|
|
}
|
|
|
|
if (sp == NULL) /* no SP found, use system default */
|
|
sp = KEY_ALLOCSP_DEFAULT(spidx.dst.sa.sa_family);
|
|
IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP"));
|
|
return sp;
|
|
}
|
|
|
|
struct secpolicy *
|
|
ipsec4_checkpolicy(struct mbuf *m, u_int dir, u_int flag, int *error,
|
|
struct inpcb *inp)
|
|
{
|
|
struct secpolicy *sp;
|
|
|
|
*error = 0;
|
|
|
|
|
|
/* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */
|
|
if (inp == NULL || inp->inp_socket == NULL) {
|
|
sp = ipsec_getpolicybyaddr(m, dir, flag, error);
|
|
} else
|
|
sp = ipsec_getpolicybysock(m, dir, IN4PCB_TO_PCB(inp), error);
|
|
if (sp == NULL) {
|
|
IPSEC_ASSERT(*error != 0,
|
|
("ipsec4_checkpolicy: getpolicy failed w/o error"));
|
|
newipsecstat.ips_out_inval++;
|
|
return NULL;
|
|
}
|
|
IPSEC_ASSERT(*error == 0,
|
|
("ipsec4_checkpolicy: sp w/ error set to %u", *error));
|
|
switch (sp->policy) {
|
|
case IPSEC_POLICY_ENTRUST:
|
|
default:
|
|
printf("ipsec4_checkpolicy: invalid policy %u\n", sp->policy);
|
|
/* fall thru... */
|
|
case IPSEC_POLICY_DISCARD:
|
|
newipsecstat.ips_out_polvio++;
|
|
*error = -EINVAL; /* packet is discarded by caller */
|
|
break;
|
|
case IPSEC_POLICY_BYPASS:
|
|
case IPSEC_POLICY_NONE:
|
|
KEY_FREESP(&sp);
|
|
sp = NULL; /* NB: force NULL result */
|
|
break;
|
|
case IPSEC_POLICY_IPSEC:
|
|
if (sp->req == NULL) /* acquire an SA */
|
|
*error = key_spdacquire(sp);
|
|
break;
|
|
}
|
|
if (*error != 0) {
|
|
KEY_FREESP(&sp);
|
|
sp = NULL;
|
|
}
|
|
DPRINTF(("ipsecpol: done, sp %p error %d, \n", sp, *error));
|
|
return sp;
|
|
}
|
|
|
|
#ifdef INET6
|
|
struct secpolicy *
|
|
ipsec6_checkpolicy(struct mbuf *m, u_int dir, u_int flag, int *error,
|
|
struct in6pcb *in6p)
|
|
{
|
|
struct secpolicy *sp;
|
|
|
|
*error = 0;
|
|
|
|
|
|
/* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */
|
|
if (in6p == NULL || in6p->in6p_socket == NULL) {
|
|
sp = ipsec_getpolicybyaddr(m, dir, flag, error);
|
|
} else
|
|
sp = ipsec_getpolicybysock(m, dir, IN6PCB_TO_PCB(in6p), error);
|
|
if (sp == NULL) {
|
|
IPSEC_ASSERT(*error != 0,
|
|
("ipsec6_checkpolicy: getpolicy failed w/o error"));
|
|
newipsecstat.ips_out_inval++;
|
|
return NULL;
|
|
}
|
|
IPSEC_ASSERT(*error == 0,
|
|
("ipsec6_checkpolicy: sp w/ error set to %u", *error));
|
|
switch (sp->policy) {
|
|
case IPSEC_POLICY_ENTRUST:
|
|
default:
|
|
printf("ipsec6_checkpolicy: invalid policy %u\n", sp->policy);
|
|
/* fall thru... */
|
|
case IPSEC_POLICY_DISCARD:
|
|
newipsecstat.ips_out_polvio++;
|
|
*error = -EINVAL; /* packet is discarded by caller */
|
|
break;
|
|
case IPSEC_POLICY_BYPASS:
|
|
case IPSEC_POLICY_NONE:
|
|
KEY_FREESP(&sp);
|
|
sp = NULL; /* NB: force NULL result */
|
|
break;
|
|
case IPSEC_POLICY_IPSEC:
|
|
if (sp->req == NULL) /* acquire an SA */
|
|
*error = key_spdacquire(sp);
|
|
break;
|
|
}
|
|
if (*error != 0) {
|
|
KEY_FREESP(&sp);
|
|
sp = NULL;
|
|
}
|
|
DPRINTF(("ipsecpol: done, sp %p error %d, \n", sp, *error));
|
|
return sp;
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
static int
|
|
ipsec4_setspidx_inpcb(struct mbuf *m ,struct inpcb *pcb)
|
|
{
|
|
int error;
|
|
|
|
IPSEC_ASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb"));
|
|
IPSEC_ASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp"));
|
|
IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
|
|
("ipsec4_setspidx_inpcb: null sp_in || sp_out"));
|
|
|
|
error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1);
|
|
if (error == 0) {
|
|
pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
|
|
pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx;
|
|
pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
|
|
} else {
|
|
bzero(&pcb->inp_sp->sp_in->spidx,
|
|
sizeof (pcb->inp_sp->sp_in->spidx));
|
|
bzero(&pcb->inp_sp->sp_out->spidx,
|
|
sizeof (pcb->inp_sp->sp_in->spidx));
|
|
}
|
|
return error;
|
|
}
|
|
|
|
#ifdef INET6
|
|
static int
|
|
ipsec6_setspidx_in6pcb(struct mbuf *m, struct in6pcb *pcb)
|
|
{
|
|
struct secpolicyindex *spidx;
|
|
int error;
|
|
|
|
IPSEC_ASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb"));
|
|
IPSEC_ASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp"));
|
|
IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL,
|
|
("ipsec6_setspidx_in6pcb: null sp_in || sp_out"));
|
|
|
|
bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
|
|
bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
|
|
|
|
spidx = &pcb->in6p_sp->sp_in->spidx;
|
|
error = ipsec_setspidx(m, spidx, 1);
|
|
if (error)
|
|
goto bad;
|
|
spidx->dir = IPSEC_DIR_INBOUND;
|
|
|
|
spidx = &pcb->in6p_sp->sp_out->spidx;
|
|
error = ipsec_setspidx(m, spidx, 1);
|
|
if (error)
|
|
goto bad;
|
|
spidx->dir = IPSEC_DIR_OUTBOUND;
|
|
|
|
return 0;
|
|
|
|
bad:
|
|
bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
|
|
bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
|
|
return error;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* configure security policy index (src/dst/proto/sport/dport)
|
|
* by looking at the content of mbuf.
|
|
* the caller is responsible for error recovery (like clearing up spidx).
|
|
*/
|
|
static int
|
|
ipsec_setspidx(struct mbuf *m, struct secpolicyindex *spidx, int needport)
|
|
{
|
|
struct ip *ip = NULL;
|
|
struct ip ipbuf;
|
|
u_int v;
|
|
struct mbuf *n;
|
|
int len;
|
|
int error;
|
|
|
|
IPSEC_ASSERT(m != NULL, ("ipsec_setspidx: null mbuf"));
|
|
|
|
/*
|
|
* validate m->m_pkthdr.len. we see incorrect length if we
|
|
* mistakenly call this function with inconsistent mbuf chain
|
|
* (like 4.4BSD tcp/udp processing). XXX should we panic here?
|
|
*/
|
|
len = 0;
|
|
for (n = m; n; n = n->m_next)
|
|
len += n->m_len;
|
|
if (m->m_pkthdr.len != len) {
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("ipsec_setspidx: "
|
|
"total of m_len(%d) != pkthdr.len(%d), "
|
|
"ignored.\n",
|
|
len, m->m_pkthdr.len));
|
|
return EINVAL;
|
|
}
|
|
|
|
if (m->m_pkthdr.len < sizeof(struct ip)) {
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("ipsec_setspidx: "
|
|
"pkthdr.len(%d) < sizeof(struct ip), ignored.\n",
|
|
m->m_pkthdr.len));
|
|
return EINVAL;
|
|
}
|
|
|
|
if (m->m_len >= sizeof(*ip))
|
|
ip = mtod(m, struct ip *);
|
|
else {
|
|
m_copydata(m, 0, sizeof(ipbuf), &ipbuf);
|
|
ip = &ipbuf;
|
|
}
|
|
#ifdef _IP_VHL
|
|
v = _IP_VHL_V(ip->ip_vhl);
|
|
#else
|
|
v = ip->ip_v;
|
|
#endif
|
|
switch (v) {
|
|
case 4:
|
|
error = ipsec4_setspidx_ipaddr(m, spidx);
|
|
if (error)
|
|
return error;
|
|
ipsec4_get_ulp(m, spidx, needport);
|
|
return 0;
|
|
#ifdef INET6
|
|
case 6:
|
|
if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("ipsec_setspidx: "
|
|
"pkthdr.len(%d) < sizeof(struct ip6_hdr), "
|
|
"ignored.\n", m->m_pkthdr.len));
|
|
return EINVAL;
|
|
}
|
|
error = ipsec6_setspidx_ipaddr(m, spidx);
|
|
if (error)
|
|
return error;
|
|
ipsec6_get_ulp(m, spidx, needport);
|
|
return 0;
|
|
#endif
|
|
default:
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("ipsec_setspidx: "
|
|
"unknown IP version %u, ignored.\n", v));
|
|
return EINVAL;
|
|
}
|
|
}
|
|
|
|
static void
|
|
ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
|
|
{
|
|
u_int8_t nxt;
|
|
int off;
|
|
|
|
/* sanity check */
|
|
IPSEC_ASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf"));
|
|
IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),
|
|
("ipsec4_get_ulp: packet too short"));
|
|
|
|
/* NB: ip_input() flips it into host endian XXX need more checking */
|
|
if (m->m_len >= sizeof(struct ip)) {
|
|
struct ip *ip = mtod(m, struct ip *);
|
|
if (ip->ip_off & IP_OFF_CONVERT(IP_MF | IP_OFFMASK))
|
|
goto done;
|
|
#ifdef _IP_VHL
|
|
off = _IP_VHL_HL(ip->ip_vhl) << 2;
|
|
#else
|
|
off = ip->ip_hl << 2;
|
|
#endif
|
|
nxt = ip->ip_p;
|
|
} else {
|
|
struct ip ih;
|
|
|
|
m_copydata(m, 0, sizeof (struct ip), &ih);
|
|
if (ih.ip_off & IP_OFF_CONVERT(IP_MF | IP_OFFMASK))
|
|
goto done;
|
|
#ifdef _IP_VHL
|
|
off = _IP_VHL_HL(ih.ip_vhl) << 2;
|
|
#else
|
|
off = ih.ip_hl << 2;
|
|
#endif
|
|
nxt = ih.ip_p;
|
|
}
|
|
|
|
while (off < m->m_pkthdr.len) {
|
|
struct ip6_ext ip6e;
|
|
struct tcphdr th;
|
|
struct udphdr uh;
|
|
|
|
switch (nxt) {
|
|
case IPPROTO_TCP:
|
|
spidx->ul_proto = nxt;
|
|
if (!needport)
|
|
goto done_proto;
|
|
if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
|
|
goto done;
|
|
m_copydata(m, off, sizeof (th), &th);
|
|
spidx->src.sin.sin_port = th.th_sport;
|
|
spidx->dst.sin.sin_port = th.th_dport;
|
|
return;
|
|
case IPPROTO_UDP:
|
|
spidx->ul_proto = nxt;
|
|
if (!needport)
|
|
goto done_proto;
|
|
if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
|
|
goto done;
|
|
m_copydata(m, off, sizeof (uh), &uh);
|
|
spidx->src.sin.sin_port = uh.uh_sport;
|
|
spidx->dst.sin.sin_port = uh.uh_dport;
|
|
return;
|
|
case IPPROTO_AH:
|
|
if (m->m_pkthdr.len > off + sizeof(ip6e))
|
|
goto done;
|
|
/* XXX sigh, this works but is totally bogus */
|
|
m_copydata(m, off, sizeof(ip6e), &ip6e);
|
|
off += (ip6e.ip6e_len + 2) << 2;
|
|
nxt = ip6e.ip6e_nxt;
|
|
break;
|
|
case IPPROTO_ICMP:
|
|
default:
|
|
/* XXX intermediate headers??? */
|
|
spidx->ul_proto = nxt;
|
|
goto done_proto;
|
|
}
|
|
}
|
|
done:
|
|
spidx->ul_proto = IPSEC_ULPROTO_ANY;
|
|
done_proto:
|
|
spidx->src.sin.sin_port = IPSEC_PORT_ANY;
|
|
spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
|
|
}
|
|
|
|
/* assumes that m is sane */
|
|
static int
|
|
ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
|
|
{
|
|
static const struct sockaddr_in template = {
|
|
sizeof (struct sockaddr_in),
|
|
AF_INET,
|
|
0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
|
|
};
|
|
|
|
spidx->src.sin = template;
|
|
spidx->dst.sin = template;
|
|
|
|
if (m->m_len < sizeof (struct ip)) {
|
|
m_copydata(m, offsetof(struct ip, ip_src),
|
|
sizeof (struct in_addr),
|
|
&spidx->src.sin.sin_addr);
|
|
m_copydata(m, offsetof(struct ip, ip_dst),
|
|
sizeof (struct in_addr),
|
|
&spidx->dst.sin.sin_addr);
|
|
} else {
|
|
struct ip *ip = mtod(m, struct ip *);
|
|
spidx->src.sin.sin_addr = ip->ip_src;
|
|
spidx->dst.sin.sin_addr = ip->ip_dst;
|
|
}
|
|
|
|
spidx->prefs = sizeof(struct in_addr) << 3;
|
|
spidx->prefd = sizeof(struct in_addr) << 3;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef INET6
|
|
static void
|
|
ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *spidx,
|
|
int needport)
|
|
{
|
|
int off, nxt;
|
|
struct tcphdr th;
|
|
struct udphdr uh;
|
|
|
|
/* sanity check */
|
|
if (m == NULL)
|
|
panic("ipsec6_get_ulp: NULL pointer was passed");
|
|
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m));
|
|
|
|
/* set default */
|
|
spidx->ul_proto = IPSEC_ULPROTO_ANY;
|
|
((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
|
|
((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
|
|
|
|
nxt = -1;
|
|
off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
|
|
if (off < 0 || m->m_pkthdr.len < off)
|
|
return;
|
|
|
|
switch (nxt) {
|
|
case IPPROTO_TCP:
|
|
spidx->ul_proto = nxt;
|
|
if (!needport)
|
|
break;
|
|
if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
|
|
break;
|
|
m_copydata(m, off, sizeof(th), &th);
|
|
((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
|
|
((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
|
|
break;
|
|
case IPPROTO_UDP:
|
|
spidx->ul_proto = nxt;
|
|
if (!needport)
|
|
break;
|
|
if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
|
|
break;
|
|
m_copydata(m, off, sizeof(uh), &uh);
|
|
((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
|
|
((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
|
|
break;
|
|
case IPPROTO_ICMPV6:
|
|
default:
|
|
/* XXX intermediate headers??? */
|
|
spidx->ul_proto = nxt;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* assumes that m is sane */
|
|
static int
|
|
ipsec6_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
|
|
{
|
|
struct ip6_hdr *ip6 = NULL;
|
|
struct ip6_hdr ip6buf;
|
|
struct sockaddr_in6 *sin6;
|
|
|
|
if (m->m_len >= sizeof(*ip6))
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
else {
|
|
m_copydata(m, 0, sizeof(ip6buf), &ip6buf);
|
|
ip6 = &ip6buf;
|
|
}
|
|
|
|
sin6 = (struct sockaddr_in6 *)&spidx->src;
|
|
bzero(sin6, sizeof(*sin6));
|
|
sin6->sin6_family = AF_INET6;
|
|
sin6->sin6_len = sizeof(struct sockaddr_in6);
|
|
bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src));
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
|
|
sin6->sin6_addr.s6_addr16[1] = 0;
|
|
sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
|
|
}
|
|
spidx->prefs = sizeof(struct in6_addr) << 3;
|
|
|
|
sin6 = (struct sockaddr_in6 *)&spidx->dst;
|
|
bzero(sin6, sizeof(*sin6));
|
|
sin6->sin6_family = AF_INET6;
|
|
sin6->sin6_len = sizeof(struct sockaddr_in6);
|
|
bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst));
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
|
|
sin6->sin6_addr.s6_addr16[1] = 0;
|
|
sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
|
|
}
|
|
spidx->prefd = sizeof(struct in6_addr) << 3;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
ipsec_delpcbpolicy(struct inpcbpolicy *p)
|
|
{
|
|
free(p, M_SECA);
|
|
}
|
|
|
|
/* initialize policy in PCB */
|
|
int
|
|
ipsec_init_policy(struct socket *so, struct inpcbpolicy **pcb_sp)
|
|
{
|
|
struct inpcbpolicy *new;
|
|
|
|
/* sanity check. */
|
|
if (so == NULL || pcb_sp == NULL)
|
|
panic("ipsec_init_policy: NULL pointer was passed");
|
|
|
|
new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy),
|
|
M_SECA, M_NOWAIT|M_ZERO);
|
|
if (new == NULL) {
|
|
ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n"));
|
|
return ENOBUFS;
|
|
}
|
|
|
|
if (IPSEC_PRIVILEGED_SO(so))
|
|
new->priv = 1;
|
|
else
|
|
new->priv = 0;
|
|
|
|
if ((new->sp_in = KEY_NEWSP()) == NULL) {
|
|
ipsec_delpcbpolicy(new);
|
|
return ENOBUFS;
|
|
}
|
|
new->sp_in->state = IPSEC_SPSTATE_ALIVE;
|
|
new->sp_in->policy = IPSEC_POLICY_ENTRUST;
|
|
|
|
if ((new->sp_out = KEY_NEWSP()) == NULL) {
|
|
KEY_FREESP(&new->sp_in);
|
|
ipsec_delpcbpolicy(new);
|
|
return ENOBUFS;
|
|
}
|
|
new->sp_out->state = IPSEC_SPSTATE_ALIVE;
|
|
new->sp_out->policy = IPSEC_POLICY_ENTRUST;
|
|
|
|
*pcb_sp = new;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* copy old ipsec policy into new */
|
|
int
|
|
ipsec_copy_policy(struct inpcbpolicy *old, struct inpcbpolicy *new)
|
|
{
|
|
struct secpolicy *sp;
|
|
|
|
sp = ipsec_deepcopy_policy(old->sp_in);
|
|
if (sp) {
|
|
KEY_FREESP(&new->sp_in);
|
|
new->sp_in = sp;
|
|
} else
|
|
return ENOBUFS;
|
|
|
|
sp = ipsec_deepcopy_policy(old->sp_out);
|
|
if (sp) {
|
|
KEY_FREESP(&new->sp_out);
|
|
new->sp_out = sp;
|
|
} else
|
|
return ENOBUFS;
|
|
|
|
new->priv = old->priv;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* deep-copy a policy in PCB */
|
|
static struct secpolicy *
|
|
ipsec_deepcopy_policy(struct secpolicy *src)
|
|
{
|
|
struct ipsecrequest *newchain = NULL;
|
|
struct ipsecrequest *p;
|
|
struct ipsecrequest **q;
|
|
struct ipsecrequest *r;
|
|
struct secpolicy *dst;
|
|
|
|
if (src == NULL)
|
|
return NULL;
|
|
dst = KEY_NEWSP();
|
|
if (dst == NULL)
|
|
return NULL;
|
|
|
|
/*
|
|
* deep-copy IPsec request chain. This is required since struct
|
|
* ipsecrequest is not reference counted.
|
|
*/
|
|
q = &newchain;
|
|
for (p = src->req; p; p = p->next) {
|
|
*q = (struct ipsecrequest *)malloc(sizeof(struct ipsecrequest),
|
|
M_SECA, M_NOWAIT);
|
|
if (*q == NULL)
|
|
goto fail;
|
|
bzero(*q, sizeof(**q));
|
|
(*q)->next = NULL;
|
|
|
|
(*q)->saidx.proto = p->saidx.proto;
|
|
(*q)->saidx.mode = p->saidx.mode;
|
|
(*q)->level = p->level;
|
|
(*q)->saidx.reqid = p->saidx.reqid;
|
|
|
|
bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
|
|
bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
|
|
|
|
(*q)->sav = NULL;
|
|
(*q)->sp = dst;
|
|
|
|
q = &((*q)->next);
|
|
}
|
|
|
|
dst->req = newchain;
|
|
dst->state = src->state;
|
|
dst->policy = src->policy;
|
|
/* do not touch the refcnt fields */
|
|
|
|
return dst;
|
|
|
|
fail:
|
|
for (p = newchain; p; p = r) {
|
|
r = p->next;
|
|
free(p, M_SECA);
|
|
p = NULL;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* set policy and ipsec request if present. */
|
|
static int
|
|
ipsec_set_policy(
|
|
struct secpolicy **pcb_sp,
|
|
int optname,
|
|
void *request,
|
|
size_t len,
|
|
int priv
|
|
)
|
|
{
|
|
struct sadb_x_policy *xpl;
|
|
struct secpolicy *newsp = NULL;
|
|
int error;
|
|
|
|
/* sanity check. */
|
|
if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL)
|
|
return EINVAL;
|
|
if (len < sizeof(*xpl))
|
|
return EINVAL;
|
|
xpl = (struct sadb_x_policy *)request;
|
|
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("ipsec_set_policy: passed policy\n");
|
|
kdebug_sadb_x_policy((struct sadb_ext *)xpl));
|
|
|
|
/* check policy type */
|
|
/* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */
|
|
if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD
|
|
|| xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
|
|
return EINVAL;
|
|
|
|
/* check privileged socket */
|
|
if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS)
|
|
return EACCES;
|
|
|
|
/* allocation new SP entry */
|
|
if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
|
|
return error;
|
|
|
|
newsp->state = IPSEC_SPSTATE_ALIVE;
|
|
|
|
/* clear old SP and set new SP */
|
|
KEY_FREESP(pcb_sp);
|
|
*pcb_sp = newsp;
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("ipsec_set_policy: new policy\n");
|
|
kdebug_secpolicy(newsp));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ipsec_get_policy(struct secpolicy *pcb_sp, struct mbuf **mp)
|
|
{
|
|
|
|
/* sanity check. */
|
|
if (pcb_sp == NULL || mp == NULL)
|
|
return EINVAL;
|
|
|
|
*mp = key_sp2msg(pcb_sp);
|
|
if (!*mp) {
|
|
ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n"));
|
|
return ENOBUFS;
|
|
}
|
|
|
|
(*mp)->m_type = MT_DATA;
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("ipsec_get_policy:\n");
|
|
kdebug_mbuf(*mp));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
ipsec4_set_policy(struct inpcb *inp, int optname ,void *request,
|
|
size_t len, int priv)
|
|
{
|
|
struct sadb_x_policy *xpl;
|
|
struct secpolicy **pcb_sp;
|
|
|
|
/* sanity check. */
|
|
if (inp == NULL || request == NULL)
|
|
return EINVAL;
|
|
if (len < sizeof(*xpl))
|
|
return EINVAL;
|
|
xpl = (struct sadb_x_policy *)request;
|
|
|
|
IPSEC_ASSERT(inp->inp_sp != NULL,
|
|
("ipsec4_set_policy(): null inp->in_sp"));
|
|
|
|
/* select direction */
|
|
switch (xpl->sadb_x_policy_dir) {
|
|
case IPSEC_DIR_INBOUND:
|
|
pcb_sp = &inp->inp_sp->sp_in;
|
|
break;
|
|
case IPSEC_DIR_OUTBOUND:
|
|
pcb_sp = &inp->inp_sp->sp_out;
|
|
break;
|
|
default:
|
|
ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
|
|
xpl->sadb_x_policy_dir));
|
|
return EINVAL;
|
|
}
|
|
|
|
return ipsec_set_policy(pcb_sp, optname, request, len, priv);
|
|
}
|
|
|
|
int
|
|
ipsec4_get_policy(struct inpcb *inp, void *request, size_t len,
|
|
struct mbuf **mp)
|
|
{
|
|
struct sadb_x_policy *xpl;
|
|
struct secpolicy *pcb_sp;
|
|
|
|
/* sanity check. */
|
|
if (inp == NULL || request == NULL || mp == NULL)
|
|
return EINVAL;
|
|
IPSEC_ASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp"));
|
|
if (len < sizeof(*xpl))
|
|
return EINVAL;
|
|
xpl = (struct sadb_x_policy *)request;
|
|
|
|
/* select direction */
|
|
switch (xpl->sadb_x_policy_dir) {
|
|
case IPSEC_DIR_INBOUND:
|
|
pcb_sp = inp->inp_sp->sp_in;
|
|
break;
|
|
case IPSEC_DIR_OUTBOUND:
|
|
pcb_sp = inp->inp_sp->sp_out;
|
|
break;
|
|
default:
|
|
ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
|
|
xpl->sadb_x_policy_dir));
|
|
return EINVAL;
|
|
}
|
|
|
|
return ipsec_get_policy(pcb_sp, mp);
|
|
}
|
|
|
|
/* delete policy in PCB */
|
|
int
|
|
ipsec4_delete_pcbpolicy(struct inpcb *inp)
|
|
{
|
|
IPSEC_ASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp"));
|
|
|
|
if (inp->inp_sp == NULL)
|
|
return 0;
|
|
|
|
if (inp->inp_sp->sp_in != NULL)
|
|
KEY_FREESP(&inp->inp_sp->sp_in);
|
|
|
|
if (inp->inp_sp->sp_out != NULL)
|
|
KEY_FREESP(&inp->inp_sp->sp_out);
|
|
|
|
ipsec_delpcbpolicy(inp->inp_sp);
|
|
inp->inp_sp = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef INET6
|
|
int
|
|
ipsec6_set_policy(struct in6pcb *in6p, int optname, void *request,
|
|
size_t len, int priv)
|
|
{
|
|
struct sadb_x_policy *xpl;
|
|
struct secpolicy **pcb_sp;
|
|
|
|
/* sanity check. */
|
|
if (in6p == NULL || request == NULL)
|
|
return EINVAL;
|
|
if (len < sizeof(*xpl))
|
|
return EINVAL;
|
|
xpl = (struct sadb_x_policy *)request;
|
|
|
|
/* select direction */
|
|
switch (xpl->sadb_x_policy_dir) {
|
|
case IPSEC_DIR_INBOUND:
|
|
pcb_sp = &in6p->in6p_sp->sp_in;
|
|
break;
|
|
case IPSEC_DIR_OUTBOUND:
|
|
pcb_sp = &in6p->in6p_sp->sp_out;
|
|
break;
|
|
default:
|
|
ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
|
|
xpl->sadb_x_policy_dir));
|
|
return EINVAL;
|
|
}
|
|
|
|
return ipsec_set_policy(pcb_sp, optname, request, len, priv);
|
|
}
|
|
|
|
int
|
|
ipsec6_get_policy(struct in6pcb *in6p, void *request, size_t len,
|
|
struct mbuf **mp)
|
|
{
|
|
struct sadb_x_policy *xpl;
|
|
struct secpolicy *pcb_sp;
|
|
|
|
/* sanity check. */
|
|
if (in6p == NULL || request == NULL || mp == NULL)
|
|
return EINVAL;
|
|
IPSEC_ASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp"));
|
|
if (len < sizeof(*xpl))
|
|
return EINVAL;
|
|
xpl = (struct sadb_x_policy *)request;
|
|
|
|
/* select direction */
|
|
switch (xpl->sadb_x_policy_dir) {
|
|
case IPSEC_DIR_INBOUND:
|
|
pcb_sp = in6p->in6p_sp->sp_in;
|
|
break;
|
|
case IPSEC_DIR_OUTBOUND:
|
|
pcb_sp = in6p->in6p_sp->sp_out;
|
|
break;
|
|
default:
|
|
ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
|
|
xpl->sadb_x_policy_dir));
|
|
return EINVAL;
|
|
}
|
|
|
|
return ipsec_get_policy(pcb_sp, mp);
|
|
}
|
|
|
|
int
|
|
ipsec6_delete_pcbpolicy(struct in6pcb *in6p)
|
|
{
|
|
IPSEC_ASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p"));
|
|
|
|
if (in6p->in6p_sp == NULL)
|
|
return 0;
|
|
|
|
if (in6p->in6p_sp->sp_in != NULL)
|
|
KEY_FREESP(&in6p->in6p_sp->sp_in);
|
|
|
|
if (in6p->in6p_sp->sp_out != NULL)
|
|
KEY_FREESP(&in6p->in6p_sp->sp_out);
|
|
|
|
ipsec_delpcbpolicy(in6p->in6p_sp);
|
|
in6p->in6p_sp = NULL;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* return current level.
|
|
* Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
|
|
*/
|
|
u_int
|
|
ipsec_get_reqlevel(struct ipsecrequest *isr)
|
|
{
|
|
u_int level = 0;
|
|
u_int esp_trans_deflev, esp_net_deflev;
|
|
u_int ah_trans_deflev, ah_net_deflev;
|
|
|
|
IPSEC_ASSERT(isr != NULL && isr->sp != NULL,
|
|
("ipsec_get_reqlevel: null argument"));
|
|
IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family,
|
|
("ipsec_get_reqlevel: af family mismatch, src %u, dst %u",
|
|
isr->sp->spidx.src.sa.sa_family,
|
|
isr->sp->spidx.dst.sa.sa_family));
|
|
|
|
/* XXX note that we have ipseclog() expanded here - code sync issue */
|
|
#define IPSEC_CHECK_DEFAULT(lev) \
|
|
(((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \
|
|
&& (lev) != IPSEC_LEVEL_UNIQUE) \
|
|
? (ipsec_debug \
|
|
? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
|
|
(lev), IPSEC_LEVEL_REQUIRE) \
|
|
: 0), \
|
|
(lev) = IPSEC_LEVEL_REQUIRE, \
|
|
(lev) \
|
|
: (lev))
|
|
|
|
/* set default level */
|
|
switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
|
|
esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
|
|
ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
|
|
ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
|
|
esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
|
|
ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
|
|
ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
panic("key_get_reqlevel: unknown af %u",
|
|
isr->sp->spidx.src.sa.sa_family);
|
|
}
|
|
|
|
#undef IPSEC_CHECK_DEFAULT
|
|
|
|
/* set level */
|
|
switch (isr->level) {
|
|
case IPSEC_LEVEL_DEFAULT:
|
|
switch (isr->saidx.proto) {
|
|
case IPPROTO_ESP:
|
|
if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
|
|
level = esp_net_deflev;
|
|
else
|
|
level = esp_trans_deflev;
|
|
break;
|
|
case IPPROTO_AH:
|
|
if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
|
|
level = ah_net_deflev;
|
|
else
|
|
level = ah_trans_deflev;
|
|
break;
|
|
case IPPROTO_IPCOMP:
|
|
/*
|
|
* we don't really care, as IPcomp document says that
|
|
* we shouldn't compress small packets
|
|
*/
|
|
level = IPSEC_LEVEL_USE;
|
|
break;
|
|
default:
|
|
panic("ipsec_get_reqlevel: Illegal protocol defined %u",
|
|
isr->saidx.proto);
|
|
}
|
|
break;
|
|
|
|
case IPSEC_LEVEL_USE:
|
|
case IPSEC_LEVEL_REQUIRE:
|
|
level = isr->level;
|
|
break;
|
|
case IPSEC_LEVEL_UNIQUE:
|
|
level = IPSEC_LEVEL_REQUIRE;
|
|
break;
|
|
|
|
default:
|
|
panic("ipsec_get_reqlevel: Illegal IPsec level %u",
|
|
isr->level);
|
|
}
|
|
|
|
return level;
|
|
}
|
|
|
|
/*
|
|
* Check security policy requirements against the actual
|
|
* packet contents. Return one if the packet should be
|
|
* reject as "invalid"; otherwiser return zero to have the
|
|
* packet treated as "valid".
|
|
*
|
|
* OUT:
|
|
* 0: valid
|
|
* 1: invalid
|
|
*/
|
|
int
|
|
ipsec_in_reject(struct secpolicy *sp, struct mbuf *m)
|
|
{
|
|
struct ipsecrequest *isr;
|
|
int need_auth;
|
|
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
|
|
printf("ipsec_in_reject: using SP\n");
|
|
kdebug_secpolicy(sp));
|
|
|
|
/* check policy */
|
|
switch (sp->policy) {
|
|
case IPSEC_POLICY_DISCARD:
|
|
return 1;
|
|
case IPSEC_POLICY_BYPASS:
|
|
case IPSEC_POLICY_NONE:
|
|
return 0;
|
|
}
|
|
|
|
IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
|
|
("ipsec_in_reject: invalid policy %u", sp->policy));
|
|
|
|
/* XXX should compare policy against ipsec header history */
|
|
|
|
need_auth = 0;
|
|
for (isr = sp->req; isr != NULL; isr = isr->next) {
|
|
if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
|
|
continue;
|
|
switch (isr->saidx.proto) {
|
|
case IPPROTO_ESP:
|
|
if ((m->m_flags & M_DECRYPTED) == 0) {
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("ipsec_in_reject: ESP m_flags:%x\n",
|
|
m->m_flags));
|
|
return 1;
|
|
}
|
|
|
|
if (!need_auth &&
|
|
isr->sav != NULL &&
|
|
isr->sav->tdb_authalgxform != NULL &&
|
|
(m->m_flags & M_AUTHIPDGM) == 0) {
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("ipsec_in_reject: ESP/AH m_flags:%x\n",
|
|
m->m_flags));
|
|
return 1;
|
|
}
|
|
break;
|
|
case IPPROTO_AH:
|
|
need_auth = 1;
|
|
if ((m->m_flags & M_AUTHIPHDR) == 0) {
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
|
|
printf("ipsec_in_reject: AH m_flags:%x\n",
|
|
m->m_flags));
|
|
return 1;
|
|
}
|
|
break;
|
|
case IPPROTO_IPCOMP:
|
|
/*
|
|
* we don't really care, as IPcomp document
|
|
* says that we shouldn't compress small
|
|
* packets, IPComp policy should always be
|
|
* treated as being in "use" level.
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
return 0; /* valid */
|
|
}
|
|
|
|
/*
|
|
* Check AH/ESP integrity.
|
|
* This function is called from tcp_input(), udp_input(),
|
|
* and {ah,esp}4_input for tunnel mode
|
|
*/
|
|
int
|
|
ipsec4_in_reject(struct mbuf *m, struct inpcb *inp)
|
|
{
|
|
struct secpolicy *sp;
|
|
int error;
|
|
int result;
|
|
|
|
IPSEC_ASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf"));
|
|
|
|
/* get SP for this packet.
|
|
* When we are called from ip_forward(), we call
|
|
* ipsec_getpolicybyaddr() with IP_FORWARDING flag.
|
|
*/
|
|
if (inp == NULL)
|
|
sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
|
|
else
|
|
sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND,
|
|
IN4PCB_TO_PCB(inp), &error);
|
|
|
|
if (sp != NULL) {
|
|
result = ipsec_in_reject(sp, m);
|
|
if (result)
|
|
newipsecstat.ips_in_polvio++;
|
|
KEY_FREESP(&sp);
|
|
} else {
|
|
result = 0; /* XXX should be panic ?
|
|
* -> No, there may be error. */
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
#ifdef INET6
|
|
/*
|
|
* Check AH/ESP integrity.
|
|
* This function is called from tcp6_input(), udp6_input(),
|
|
* and {ah,esp}6_input for tunnel mode
|
|
*/
|
|
int
|
|
ipsec6_in_reject(struct mbuf *m, struct in6pcb *in6p)
|
|
{
|
|
struct secpolicy *sp = NULL;
|
|
int error;
|
|
int result;
|
|
|
|
/* sanity check */
|
|
if (m == NULL)
|
|
return 0; /* XXX should be panic ? */
|
|
|
|
/* get SP for this packet.
|
|
* When we are called from ip_forward(), we call
|
|
* ipsec_getpolicybyaddr() with IP_FORWARDING flag.
|
|
*/
|
|
if (in6p == NULL)
|
|
sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
|
|
else
|
|
sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND,
|
|
IN6PCB_TO_PCB(in6p),
|
|
&error);
|
|
|
|
if (sp != NULL) {
|
|
result = ipsec_in_reject(sp, m);
|
|
if (result)
|
|
newipsecstat.ips_in_polvio++;
|
|
KEY_FREESP(&sp);
|
|
} else {
|
|
result = 0;
|
|
}
|
|
return result;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* compute the byte size to be occupied by IPsec header.
|
|
* in case it is tunneled, it includes the size of outer IP header.
|
|
* NOTE: SP passed is free in this function.
|
|
*/
|
|
static size_t
|
|
ipsec_hdrsiz(struct secpolicy *sp)
|
|
{
|
|
struct ipsecrequest *isr;
|
|
size_t siz;
|
|
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
|
|
printf("ipsec_hdrsiz: using SP\n");
|
|
kdebug_secpolicy(sp));
|
|
|
|
switch (sp->policy) {
|
|
case IPSEC_POLICY_DISCARD:
|
|
case IPSEC_POLICY_BYPASS:
|
|
case IPSEC_POLICY_NONE:
|
|
return 0;
|
|
}
|
|
|
|
IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
|
|
("ipsec_hdrsiz: invalid policy %u", sp->policy));
|
|
|
|
siz = 0;
|
|
for (isr = sp->req; isr != NULL; isr = isr->next) {
|
|
size_t clen = 0;
|
|
|
|
switch (isr->saidx.proto) {
|
|
case IPPROTO_ESP:
|
|
clen = esp_hdrsiz(isr->sav);
|
|
break;
|
|
case IPPROTO_AH:
|
|
clen = ah_hdrsiz(isr->sav);
|
|
break;
|
|
case IPPROTO_IPCOMP:
|
|
clen = sizeof(struct ipcomp);
|
|
break;
|
|
}
|
|
|
|
if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
|
|
switch (isr->saidx.dst.sa.sa_family) {
|
|
case AF_INET:
|
|
clen += sizeof(struct ip);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
clen += sizeof(struct ip6_hdr);
|
|
break;
|
|
#endif
|
|
default:
|
|
ipseclog((LOG_ERR, "ipsec_hdrsiz: "
|
|
"unknown AF %d in IPsec tunnel SA\n",
|
|
((struct sockaddr *)&isr->saidx.dst)->sa_family));
|
|
break;
|
|
}
|
|
}
|
|
siz += clen;
|
|
}
|
|
|
|
return siz;
|
|
}
|
|
|
|
/* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
|
|
size_t
|
|
ipsec4_hdrsiz(struct mbuf *m, u_int dir, struct inpcb *inp)
|
|
{
|
|
struct secpolicy *sp;
|
|
int error;
|
|
size_t size;
|
|
|
|
IPSEC_ASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf"));
|
|
IPSEC_ASSERT(inp == NULL || inp->inp_socket != NULL,
|
|
("ipsec4_hdrsize: socket w/o inpcb"));
|
|
|
|
/* get SP for this packet.
|
|
* When we are called from ip_forward(), we call
|
|
* ipsec_getpolicybyaddr() with IP_FORWARDING flag.
|
|
*/
|
|
if (inp == NULL)
|
|
sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
|
|
else
|
|
sp = ipsec_getpolicybysock(m, dir,
|
|
IN4PCB_TO_PCB(inp), &error);
|
|
|
|
if (sp != NULL) {
|
|
size = ipsec_hdrsiz(sp);
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
|
|
printf("ipsec4_hdrsiz: size:%lu.\n",
|
|
(unsigned long)size));
|
|
|
|
KEY_FREESP(&sp);
|
|
} else {
|
|
size = 0; /* XXX should be panic ? */
|
|
}
|
|
return size;
|
|
}
|
|
|
|
#ifdef INET6
|
|
/* This function is called from ipsec6_hdrsize_tcp(),
|
|
* and maybe from ip6_forward.()
|
|
*/
|
|
size_t
|
|
ipsec6_hdrsiz(struct mbuf *m, u_int dir, struct in6pcb *in6p)
|
|
{
|
|
struct secpolicy *sp;
|
|
int error;
|
|
size_t size;
|
|
|
|
IPSEC_ASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf"));
|
|
IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL,
|
|
("ipsec6_hdrsize: socket w/o inpcb"));
|
|
|
|
/* get SP for this packet */
|
|
/* XXX Is it right to call with IP_FORWARDING. */
|
|
if (in6p == NULL)
|
|
sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
|
|
else
|
|
sp = ipsec_getpolicybysock(m, dir,
|
|
IN6PCB_TO_PCB(in6p),
|
|
&error);
|
|
|
|
if (sp == NULL)
|
|
return 0;
|
|
size = ipsec_hdrsiz(sp);
|
|
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
|
|
printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size));
|
|
KEY_FREESP(&sp);
|
|
|
|
return size;
|
|
}
|
|
#endif /*INET6*/
|
|
|
|
/*
|
|
* Check the variable replay window.
|
|
* ipsec_chkreplay() performs replay check before ICV verification.
|
|
* ipsec_updatereplay() updates replay bitmap. This must be called after
|
|
* ICV verification (it also performs replay check, which is usually done
|
|
* beforehand).
|
|
* 0 (zero) is returned if packet disallowed, 1 if packet permitted.
|
|
*
|
|
* based on RFC 2401.
|
|
*/
|
|
int
|
|
ipsec_chkreplay(u_int32_t seq, struct secasvar *sav)
|
|
{
|
|
const struct secreplay *replay;
|
|
u_int32_t diff;
|
|
int fr;
|
|
u_int32_t wsizeb; /* constant: bits of window size */
|
|
int frlast; /* constant: last frame */
|
|
|
|
IPSEC_SPLASSERT_SOFTNET("ipsec_chkreplay");
|
|
|
|
IPSEC_ASSERT(sav != NULL, ("ipsec_chkreplay: Null SA"));
|
|
IPSEC_ASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state"));
|
|
|
|
replay = sav->replay;
|
|
|
|
if (replay->wsize == 0)
|
|
return 1; /* no need to check replay. */
|
|
|
|
/* constant */
|
|
frlast = replay->wsize - 1;
|
|
wsizeb = replay->wsize << 3;
|
|
|
|
/* sequence number of 0 is invalid */
|
|
if (seq == 0)
|
|
return 0;
|
|
|
|
/* first time is always okay */
|
|
if (replay->count == 0)
|
|
return 1;
|
|
|
|
if (seq > replay->lastseq) {
|
|
/* larger sequences are okay */
|
|
return 1;
|
|
} else {
|
|
/* seq is equal or less than lastseq. */
|
|
diff = replay->lastseq - seq;
|
|
|
|
/* over range to check, i.e. too old or wrapped */
|
|
if (diff >= wsizeb)
|
|
return 0;
|
|
|
|
fr = frlast - diff / 8;
|
|
|
|
/* this packet already seen ? */
|
|
if ((replay->bitmap)[fr] & (1 << (diff % 8)))
|
|
return 0;
|
|
|
|
/* out of order but good */
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* check replay counter whether to update or not.
|
|
* OUT: 0: OK
|
|
* 1: NG
|
|
*/
|
|
int
|
|
ipsec_updatereplay(u_int32_t seq, struct secasvar *sav)
|
|
{
|
|
struct secreplay *replay;
|
|
u_int32_t diff;
|
|
int fr;
|
|
u_int32_t wsizeb; /* constant: bits of window size */
|
|
int frlast; /* constant: last frame */
|
|
|
|
IPSEC_SPLASSERT_SOFTNET("ipsec_updatereplay");
|
|
|
|
IPSEC_ASSERT(sav != NULL, ("ipsec_updatereplay: Null SA"));
|
|
IPSEC_ASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state"));
|
|
|
|
replay = sav->replay;
|
|
|
|
if (replay->wsize == 0)
|
|
goto ok; /* no need to check replay. */
|
|
|
|
/* constant */
|
|
frlast = replay->wsize - 1;
|
|
wsizeb = replay->wsize << 3;
|
|
|
|
/* sequence number of 0 is invalid */
|
|
if (seq == 0)
|
|
return 1;
|
|
|
|
/* first time */
|
|
if (replay->count == 0) {
|
|
replay->lastseq = seq;
|
|
bzero(replay->bitmap, replay->wsize);
|
|
(replay->bitmap)[frlast] = 1;
|
|
goto ok;
|
|
}
|
|
|
|
if (seq > replay->lastseq) {
|
|
/* seq is larger than lastseq. */
|
|
diff = seq - replay->lastseq;
|
|
|
|
/* new larger sequence number */
|
|
if (diff < wsizeb) {
|
|
/* In window */
|
|
/* set bit for this packet */
|
|
vshiftl(replay->bitmap, diff, replay->wsize);
|
|
(replay->bitmap)[frlast] |= 1;
|
|
} else {
|
|
/* this packet has a "way larger" */
|
|
bzero(replay->bitmap, replay->wsize);
|
|
(replay->bitmap)[frlast] = 1;
|
|
}
|
|
replay->lastseq = seq;
|
|
|
|
/* larger is good */
|
|
} else {
|
|
/* seq is equal or less than lastseq. */
|
|
diff = replay->lastseq - seq;
|
|
|
|
/* over range to check, i.e. too old or wrapped */
|
|
if (diff >= wsizeb)
|
|
return 1;
|
|
|
|
fr = frlast - diff / 8;
|
|
|
|
/* this packet already seen ? */
|
|
if ((replay->bitmap)[fr] & (1 << (diff % 8)))
|
|
return 1;
|
|
|
|
/* mark as seen */
|
|
(replay->bitmap)[fr] |= (1 << (diff % 8));
|
|
|
|
/* out of order but good */
|
|
}
|
|
|
|
ok:
|
|
if (replay->count == ~0) {
|
|
|
|
/* set overflow flag */
|
|
replay->overflow++;
|
|
|
|
/* don't increment, no more packets accepted */
|
|
if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
|
|
return 1;
|
|
|
|
ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n",
|
|
replay->overflow, ipsec_logsastr(sav)));
|
|
}
|
|
|
|
replay->count++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* shift variable length bunffer to left.
|
|
* IN: bitmap: pointer to the buffer
|
|
* nbit: the number of to shift.
|
|
* wsize: buffer size (bytes).
|
|
*/
|
|
static void
|
|
vshiftl(unsigned char *bitmap, int nbit, int wsize)
|
|
{
|
|
int s, j, i;
|
|
unsigned char over;
|
|
|
|
for (j = 0; j < nbit; j += 8) {
|
|
s = (nbit - j < 8) ? (nbit - j): 8;
|
|
bitmap[0] <<= s;
|
|
for (i = 1; i < wsize; i++) {
|
|
over = (bitmap[i] >> (8 - s));
|
|
bitmap[i] <<= s;
|
|
bitmap[i-1] |= over;
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
/* Return a printable string for the IPv4 address. */
|
|
static char *
|
|
inet_ntoa4(struct in_addr ina)
|
|
{
|
|
static char buf[4][4 * sizeof "123" + 4];
|
|
unsigned char *ucp = (unsigned char *) &ina;
|
|
static int i = 3;
|
|
|
|
i = (i + 1) % 4;
|
|
snprintf(buf[i], sizeof(buf[i]), "%d.%d.%d.%d",
|
|
ucp[0] & 0xff, ucp[1] & 0xff, ucp[2] & 0xff, ucp[3] & 0xff);
|
|
return (buf[i]);
|
|
}
|
|
|
|
/* Return a printable string for the address. */
|
|
const char *
|
|
ipsec_address(union sockaddr_union* sa)
|
|
{
|
|
switch (sa->sa.sa_family) {
|
|
#if INET
|
|
case AF_INET:
|
|
return inet_ntoa4(sa->sin.sin_addr);
|
|
#endif /* INET */
|
|
|
|
#if INET6
|
|
case AF_INET6:
|
|
return ip6_sprintf(&sa->sin6.sin6_addr);
|
|
#endif /* INET6 */
|
|
|
|
default:
|
|
return "(unknown address family)";
|
|
}
|
|
}
|
|
|
|
const char *
|
|
ipsec_logsastr(struct secasvar *sav)
|
|
{
|
|
static char buf[256];
|
|
char *p;
|
|
struct secasindex *saidx = &sav->sah->saidx;
|
|
|
|
IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family,
|
|
("ipsec_logsastr: address family mismatch"));
|
|
|
|
p = buf;
|
|
snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
|
|
while (p && *p)
|
|
p++;
|
|
/* NB: only use ipsec_address on one address at a time */
|
|
snprintf(p, sizeof (buf) - (p - buf), "src=%s ",
|
|
ipsec_address(&saidx->src));
|
|
while (p && *p)
|
|
p++;
|
|
snprintf(p, sizeof (buf) - (p - buf), "dst=%s)",
|
|
ipsec_address(&saidx->dst));
|
|
|
|
return buf;
|
|
}
|
|
|
|
void
|
|
ipsec_dumpmbuf(struct mbuf *m)
|
|
{
|
|
int totlen;
|
|
int i;
|
|
u_char *p;
|
|
|
|
totlen = 0;
|
|
printf("---\n");
|
|
while (m) {
|
|
p = mtod(m, u_char *);
|
|
for (i = 0; i < m->m_len; i++) {
|
|
printf("%02x ", p[i]);
|
|
totlen++;
|
|
if (totlen % 16 == 0)
|
|
printf("\n");
|
|
}
|
|
m = m->m_next;
|
|
}
|
|
if (totlen % 16 != 0)
|
|
printf("\n");
|
|
printf("---\n");
|
|
}
|
|
|
|
#ifdef INET6
|
|
struct secpolicy *
|
|
ipsec6_check_policy(struct mbuf * m, const struct socket * so,
|
|
int flags, int * needipsecp, int * errorp)
|
|
{
|
|
struct in6pcb *in6p = NULL;
|
|
struct m_tag *mtag;
|
|
struct secpolicy *sp = NULL;
|
|
struct tdb_ident *tdbi;
|
|
int s;
|
|
int error = 0;
|
|
int needipsec = 0;
|
|
|
|
if (so != NULL && so->so_proto->pr_domain->dom_family == AF_INET6)
|
|
in6p = sotoin6pcb(so);
|
|
|
|
mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
|
|
s = splsoftnet();
|
|
if (mtag != NULL) {
|
|
tdbi = (struct tdb_ident *)(mtag + 1);
|
|
sp = ipsec_getpolicy(tdbi, IPSEC_DIR_OUTBOUND);
|
|
if (sp == NULL)
|
|
error = -EINVAL; /* force silent drop */
|
|
m_tag_delete(m, mtag);
|
|
} else {
|
|
if (in6p != NULL &&
|
|
IPSEC_PCB_SKIP_IPSEC(in6p->in6p_sp, IPSEC_DIR_OUTBOUND))
|
|
goto skippolicycheck;
|
|
sp = ipsec6_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error,in6p);
|
|
}
|
|
|
|
/*
|
|
* There are four return cases:
|
|
* sp != NULL apply IPsec policy
|
|
* sp == NULL, error == 0 no IPsec handling needed
|
|
* sp == NULL, error == -EINVAL discard packet w/o error
|
|
* sp == NULL, error != 0 discard packet, report error
|
|
*/
|
|
|
|
if (sp == NULL) {
|
|
splx(s);
|
|
|
|
if (error != 0) {
|
|
needipsec = 0;
|
|
} else {
|
|
/* No IPsec processing for this packet. */
|
|
needipsec = 0;
|
|
}
|
|
} else {
|
|
/* Loop detection, check if ipsec processing already done */
|
|
IPSEC_ASSERT(sp->req != NULL, ("ip6_output: no ipsec request"));
|
|
for (mtag = m_tag_first(m); mtag != NULL;
|
|
mtag = m_tag_next(m, mtag)) {
|
|
#ifdef MTAG_ABI_COMPAT
|
|
if (mtag->m_tag_cookie != MTAG_ABI_COMPAT)
|
|
continue;
|
|
#endif
|
|
if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE &&
|
|
mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED)
|
|
continue;
|
|
/*
|
|
* Check if policy has an SA associated with it.
|
|
* This can happen when an SP has yet to acquire
|
|
* an SA; e.g. on first reference. If it occurs,
|
|
* then we let ipsec4_process_packet do its thing.
|
|
*/
|
|
if (sp->req->sav == NULL)
|
|
break;
|
|
tdbi = (struct tdb_ident *)(mtag + 1);
|
|
if (tdbi->spi == sp->req->sav->spi &&
|
|
tdbi->proto == sp->req->sav->sah->saidx.proto &&
|
|
bcmp(&tdbi->dst, &sp->req->sav->sah->saidx.dst,
|
|
sizeof (union sockaddr_union)) == 0) {
|
|
/*
|
|
* No IPsec processing is needed, free
|
|
* reference to SP.
|
|
*
|
|
* NB: null pointer to avoid free at
|
|
* done: below.
|
|
*/
|
|
KEY_FREESP(&sp), sp = NULL;
|
|
needipsec = 0;
|
|
splx(s);
|
|
goto skippolicycheck;
|
|
}
|
|
}
|
|
splx(s);
|
|
needipsec = 1;
|
|
}
|
|
skippolicycheck:;
|
|
|
|
*errorp = error;
|
|
*needipsecp = needipsec;
|
|
return sp;
|
|
}
|
|
#endif
|
|
|
|
|
|
|
|
/* XXX this stuff doesn't belong here... */
|
|
|
|
static struct xformsw* xforms = NULL;
|
|
|
|
/*
|
|
* Register a transform; typically at system startup.
|
|
*/
|
|
void
|
|
xform_register(struct xformsw* xsp)
|
|
{
|
|
xsp->xf_next = xforms;
|
|
xforms = xsp;
|
|
}
|
|
|
|
/*
|
|
* Initialize transform support in an sav.
|
|
*/
|
|
int
|
|
xform_init(struct secasvar *sav, int xftype)
|
|
{
|
|
struct xformsw *xsp;
|
|
|
|
if (sav->tdb_xform != NULL) /* previously initialized */
|
|
return 0;
|
|
for (xsp = xforms; xsp; xsp = xsp->xf_next)
|
|
if (xsp->xf_type == xftype)
|
|
return (*xsp->xf_init)(sav, xsp);
|
|
|
|
DPRINTF(("xform_init: no match for xform type %d\n", xftype));
|
|
return EINVAL;
|
|
}
|
|
|
|
#ifdef __NetBSD__
|
|
void
|
|
ipsec_attach(void)
|
|
{
|
|
printf("initializing IPsec...");
|
|
ah_attach();
|
|
esp_attach();
|
|
ipcomp_attach();
|
|
ipe4_attach();
|
|
#ifdef TCP_SIGNATURE
|
|
tcpsignature_attach();
|
|
#endif
|
|
printf(" done\n");
|
|
}
|
|
#endif /* __NetBSD__ */
|