605 lines
15 KiB
C
605 lines
15 KiB
C
/* $NetBSD: ipsec_input.c,v 1.80 2024/02/10 18:43:53 andvar Exp $ */
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/* $FreeBSD: ipsec_input.c,v 1.2.4.2 2003/03/28 20:32:53 sam Exp $ */
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/* $OpenBSD: ipsec_input.c,v 1.63 2003/02/20 18:35:43 deraadt Exp $ */
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/*
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* The authors of this code are John Ioannidis (ji@tla.org),
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* Angelos D. Keromytis (kermit@csd.uch.gr) and
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* Niels Provos (provos@physnet.uni-hamburg.de).
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*
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* This code was written by John Ioannidis for BSD/OS in Athens, Greece,
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* in November 1995.
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*
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* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
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* by Angelos D. Keromytis.
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*
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* Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
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* and Niels Provos.
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*
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* Additional features in 1999 by Angelos D. Keromytis.
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*
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* Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
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* Angelos D. Keromytis and Niels Provos.
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* Copyright (c) 2001, Angelos D. Keromytis.
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*
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* Permission to use, copy, and modify this software with or without fee
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* is hereby granted, provided that this entire notice is included in
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* all copies of any software which is or includes a copy or
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* modification of this software.
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* You may use this code under the GNU public license if you so wish. Please
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* contribute changes back to the authors under this freer than GPL license
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* so that we may further the use of strong encryption without limitations to
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* all.
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*
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* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
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* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
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* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
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* PURPOSE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ipsec_input.c,v 1.80 2024/02/10 18:43:53 andvar Exp $");
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/*
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* IPsec input processing.
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*/
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#if defined(_KERNEL_OPT)
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#include "opt_inet.h"
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#endif
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#include <sys/param.h>
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#include <sys/systm.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/errno.h>
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#include <sys/syslog.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/in_proto.h>
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#include <netinet/udp.h>
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#include <netinet/tcp.h>
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#include <netinet/ip6.h>
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#ifdef INET6
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#include <netinet6/in6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/ip6_private.h>
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#include <netinet6/scope6_var.h>
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#endif
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#include <netinet/in_pcb.h>
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#include <netipsec/ipsec.h>
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#include <netipsec/ipsec_private.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.h>
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#include <netipsec/esp_var.h>
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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/xform.h>
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#include <netinet6/ip6protosw.h>
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#define IPSEC_ISTAT(p, x, y, z) \
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do { \
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switch (p) { \
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case IPPROTO_ESP: \
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ESP_STATINC(x); \
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break; \
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case IPPROTO_AH: \
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AH_STATINC(y); \
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break; \
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default: \
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IPCOMP_STATINC(z); \
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break; \
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} \
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} while (/*CONSTCOND*/0)
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/*
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* fixup TCP/UDP checksum
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*
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* XXX: if we have NAT-OA payload from IKE server,
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* we must do the differential update of checksum.
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*
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* XXX: NAT-OAi/NAT-OAr derived from IKE initiator/responder.
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* how to know the IKE side from kernel?
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*/
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static struct mbuf *
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ipsec4_fixup_checksum(struct mbuf *m)
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{
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struct ip *ip;
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struct tcphdr *th;
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struct udphdr *uh;
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int poff, off;
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int plen;
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if (m->m_len < sizeof(*ip)) {
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m = m_pullup(m, sizeof(*ip));
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if (m == NULL)
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return NULL;
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}
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ip = mtod(m, struct ip *);
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poff = ip->ip_hl << 2;
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plen = ntohs(ip->ip_len) - poff;
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switch (ip->ip_p) {
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case IPPROTO_TCP:
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M_REGION_GET(th, struct tcphdr *, m, poff, sizeof(*th));
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if (th == NULL)
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return NULL;
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off = th->th_off << 2;
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if (off < sizeof(*th) || off > plen) {
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m_freem(m);
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return NULL;
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}
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th->th_sum = 0;
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th->th_sum = in4_cksum(m, IPPROTO_TCP, poff, plen);
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break;
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case IPPROTO_UDP:
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M_REGION_GET(uh, struct udphdr *, m, poff, sizeof(*uh));
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if (uh == NULL)
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return NULL;
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off = sizeof(*uh);
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if (off > plen) {
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m_freem(m);
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return NULL;
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}
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uh->uh_sum = 0;
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uh->uh_sum = in4_cksum(m, IPPROTO_UDP, poff, plen);
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break;
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default:
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/* no checksum */
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return m;
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}
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return m;
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}
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static void
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nat_t_ports_get(struct mbuf *m, uint16_t *dport, uint16_t *sport)
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{
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struct m_tag *tag;
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if ((tag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS))) {
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*sport = ((uint16_t *)(tag + 1))[0];
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*dport = ((uint16_t *)(tag + 1))[1];
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} else
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*sport = *dport = 0;
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}
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static uint32_t
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spi_get(struct mbuf *m, int sproto, int skip)
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{
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uint32_t spi;
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uint16_t cpi;
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switch (sproto) {
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case IPPROTO_ESP:
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m_copydata(m, skip, sizeof(spi), &spi);
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return spi;
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case IPPROTO_AH:
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m_copydata(m, skip + sizeof(spi), sizeof(spi), &spi);
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return spi;
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case IPPROTO_IPCOMP:
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m_copydata(m, skip + sizeof(cpi), sizeof(cpi), &cpi);
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return htonl(ntohs(cpi));
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default:
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panic("%s called with bad protocol number: %d\n", __func__,
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sproto);
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}
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}
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/*
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* ipsec_common_input gets called when an IPsec-protected packet
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* is received by IPv4 or IPv6. Its job is to find the right SA
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* and call the appropriate transform. The transform callback
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* takes care of further processing (like ingress filtering).
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*/
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static int
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ipsec_common_input(struct mbuf *m, int skip, int protoff, int af, int sproto)
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{
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char buf[IPSEC_ADDRSTRLEN], buf2[IPSEC_ADDRSTRLEN];
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union sockaddr_union src_address, dst_address;
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struct secasvar *sav;
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u_int32_t spi;
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u_int16_t sport;
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u_int16_t dport;
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int error;
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IPSEC_ISTAT(sproto, ESP_STAT_INPUT, AH_STAT_INPUT,
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IPCOMP_STAT_INPUT);
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KASSERT(m != NULL);
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if ((sproto == IPPROTO_ESP && !esp_enable) ||
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(sproto == IPPROTO_AH && !ah_enable) ||
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(sproto == IPPROTO_IPCOMP && !ipcomp_enable)) {
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m_freem(m);
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IPSEC_ISTAT(sproto, ESP_STAT_PDROPS, AH_STAT_PDROPS,
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IPCOMP_STAT_PDROPS);
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return EOPNOTSUPP;
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}
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if (m->m_pkthdr.len - skip < 2 * sizeof(u_int32_t)) {
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m_freem(m);
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IPSEC_ISTAT(sproto, ESP_STAT_HDROPS, AH_STAT_HDROPS,
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IPCOMP_STAT_HDROPS);
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IPSECLOG(LOG_DEBUG, "packet too small\n");
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return EINVAL;
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}
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/* Retrieve the SPI from the relevant IPsec header */
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spi = spi_get(m, sproto, skip);
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/* find the source port for NAT-T */
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nat_t_ports_get(m, &dport, &sport);
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/*
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* Find the SA and (indirectly) call the appropriate
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* kernel crypto routine. The resulting mbuf chain is a valid
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* IP packet ready to go through input processing.
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*/
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memset(&src_address, 0, sizeof (src_address));
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memset(&dst_address, 0, sizeof(dst_address));
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src_address.sa.sa_family = af;
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dst_address.sa.sa_family = af;
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switch (af) {
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#ifdef INET
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case AF_INET:
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src_address.sin.sin_len = sizeof(struct sockaddr_in);
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dst_address.sin.sin_len = sizeof(struct sockaddr_in);
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m_copydata(m, offsetof(struct ip, ip_src),
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sizeof(struct in_addr),
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&src_address.sin.sin_addr);
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m_copydata(m, offsetof(struct ip, ip_dst),
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sizeof(struct in_addr),
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&dst_address.sin.sin_addr);
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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src_address.sin6.sin6_len = sizeof(struct sockaddr_in6);
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dst_address.sin6.sin6_len = sizeof(struct sockaddr_in6);
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m_copydata(m, offsetof(struct ip6_hdr, ip6_src),
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sizeof(struct in6_addr),
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&src_address.sin6.sin6_addr);
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m_copydata(m, offsetof(struct ip6_hdr, ip6_dst),
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sizeof(struct in6_addr),
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&dst_address.sin6.sin6_addr);
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if (sa6_recoverscope(&dst_address.sin6)) {
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m_freem(m);
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return EINVAL;
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}
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break;
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#endif
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default:
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IPSECLOG(LOG_DEBUG, "unsupported protocol family %u\n", af);
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m_freem(m);
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IPSEC_ISTAT(sproto, ESP_STAT_NOPF, AH_STAT_NOPF,
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IPCOMP_STAT_NOPF);
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return EPFNOSUPPORT;
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}
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/* NB: only pass dst since key_lookup_sa follows RFC2401 */
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sav = KEY_LOOKUP_SA(&dst_address, sproto, spi, sport, dport);
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if (sav == NULL) {
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static struct timeval lasttime = {0, 0};
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static int curpps = 0;
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if (!ipsec_debug && ppsratecheck(&lasttime, &curpps, 1)) {
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if (sport || dport) {
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log(LOG_INFO,
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"no key association found for SA"
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" %s[%u]-%s[%u]/SPI 0x%08lx\n",
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ipsec_address(&src_address, buf, sizeof(buf)),
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ntohs(sport),
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ipsec_address(&dst_address, buf2, sizeof(buf2)),
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ntohs(dport),
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(u_long) ntohl(spi));
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} else {
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log(LOG_INFO,
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"no key association found for"
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" SA %s-%s/SPI 0x%08lx\n",
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ipsec_address(&src_address, buf, sizeof(buf)),
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ipsec_address(&src_address, buf2, sizeof(buf2)),
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(u_long) ntohl(spi));
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}
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} else if (ipsec_debug) {
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IPSECLOG(LOG_DEBUG,
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"no key association found for SA "
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"%s-%s/SPI 0x%08lx/PROTO %u/PORT %u-%u\n",
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ipsec_address(&src_address, buf, sizeof(buf)),
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ipsec_address(&dst_address, buf2, sizeof(buf2)),
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(u_long) ntohl(spi), sproto, ntohs(dport), ntohs(sport));
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}
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IPSEC_ISTAT(sproto, ESP_STAT_NOTDB, AH_STAT_NOTDB,
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IPCOMP_STAT_NOTDB);
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m_freem(m);
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return ENOENT;
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}
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KASSERT(sav->tdb_xform != NULL);
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/*
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* Call appropriate transform and return -- callback takes care of
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* everything else.
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*/
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error = (*sav->tdb_xform->xf_input)(m, sav, skip, protoff);
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KEY_SA_UNREF(&sav);
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return error;
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}
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#ifdef INET
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/*
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* Common input handler for IPv4 AH, ESP, and IPCOMP.
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*/
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void
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ipsec4_common_input(struct mbuf *m, int off, int proto)
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{
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(void)ipsec_common_input(m, off, offsetof(struct ip, ip_p),
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AF_INET, proto);
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}
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/*
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* IPsec input callback for INET protocols.
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* This routine is called as the transform callback.
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* Takes care of filtering and other sanity checks on
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* the processed packet.
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*/
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int
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ipsec4_common_input_cb(struct mbuf *m, struct secasvar *sav,
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int skip, int protoff)
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{
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int prot, af __diagused, sproto;
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struct ip *ip;
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struct secasindex *saidx;
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int error;
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if (__predict_false(m == NULL)) {
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panic("%s: NULL mbuf", __func__);
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}
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if (__predict_false(skip < sizeof(struct ip))) {
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panic("%s: short skip", __func__);
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}
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KASSERT(sav != NULL);
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saidx = &sav->sah->saidx;
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af = saidx->dst.sa.sa_family;
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KASSERTMSG(af == AF_INET, "unexpected af %u", af);
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sproto = saidx->proto;
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KASSERTMSG(sproto == IPPROTO_ESP || sproto == IPPROTO_AH ||
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sproto == IPPROTO_IPCOMP,
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"unexpected security protocol %u", sproto);
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/*
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* Update the IPv4 header. The length of the packet may have changed,
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* so fix it, and recompute the checksum.
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*/
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if (m->m_len < skip && (m = m_pullup(m, skip)) == NULL) {
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char buf[IPSEC_ADDRSTRLEN];
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cantpull:
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IPSECLOG(LOG_DEBUG,
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"processing failed for SA %s/%08lx\n",
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ipsec_address(&sav->sah->saidx.dst, buf,
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sizeof(buf)), (u_long) ntohl(sav->spi));
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IPSEC_ISTAT(sproto, ESP_STAT_HDROPS, AH_STAT_HDROPS,
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IPCOMP_STAT_HDROPS);
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error = ENOBUFS;
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goto bad;
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}
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ip = mtod(m, struct ip *);
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ip->ip_len = htons(m->m_pkthdr.len);
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ip->ip_sum = 0;
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ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
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/*
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* Update TCP/UDP checksum
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* XXX: should only do it in NAT-T case
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* XXX: should do it incrementally, see FreeBSD code.
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*/
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m = ipsec4_fixup_checksum(m);
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if (m == NULL)
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goto cantpull;
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ip = mtod(m, struct ip *);
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prot = ip->ip_p;
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M_VERIFY_PACKET(m);
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key_sa_recordxfer(sav, m);
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if ((inetsw[ip_protox[prot]].pr_flags & PR_LASTHDR) != 0 &&
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ipsec_in_reject(m, NULL)) {
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error = EINVAL;
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goto bad;
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}
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/*
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* There is no struct ifnet for tunnel mode IP-IP tunnel connection,
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* so we cannot write filtering rule to the inner packet.
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*/
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if (saidx->mode == IPSEC_MODE_TUNNEL)
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m->m_pkthdr.pkthdr_flags |= PKTHDR_FLAG_IPSEC_SKIP_PFIL;
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(*inetsw[ip_protox[prot]].pr_input)(m, skip, prot);
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return 0;
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bad:
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m_freem(m);
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return error;
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}
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#endif /* INET */
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#ifdef INET6
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int
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ipsec6_common_input(struct mbuf **mp, int *offp, int proto)
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{
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int l = 0;
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int protoff, nxt;
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struct ip6_ext ip6e;
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if (*offp < sizeof(struct ip6_hdr)) {
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IPSECLOG(LOG_DEBUG, "bad offset %u\n", *offp);
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IPSEC_ISTAT(proto, ESP_STAT_HDROPS, AH_STAT_HDROPS,
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IPCOMP_STAT_HDROPS);
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m_freem(*mp);
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return IPPROTO_DONE;
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} else if (*offp == sizeof(struct ip6_hdr)) {
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protoff = offsetof(struct ip6_hdr, ip6_nxt);
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} else {
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/* Chase down the header chain... */
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protoff = sizeof(struct ip6_hdr);
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nxt = (mtod(*mp, struct ip6_hdr *))->ip6_nxt;
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do {
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protoff += l;
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m_copydata(*mp, protoff, sizeof(ip6e), &ip6e);
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if (nxt == IPPROTO_AH)
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l = (ip6e.ip6e_len + 2) << 2;
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else if (nxt == IPPROTO_FRAGMENT)
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l = sizeof(struct ip6_frag);
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else
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l = (ip6e.ip6e_len + 1) << 3;
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KASSERT(l > 0);
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nxt = ip6e.ip6e_nxt;
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} while (protoff + l < *offp);
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/* Malformed packet check */
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if (protoff + l != *offp) {
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IPSECLOG(LOG_DEBUG, "bad packet header chain, "
|
|
"protoff %u, l %u, off %u\n", protoff, l, *offp);
|
|
IPSEC_ISTAT(proto, ESP_STAT_HDROPS,
|
|
AH_STAT_HDROPS,
|
|
IPCOMP_STAT_HDROPS);
|
|
m_freem(*mp);
|
|
*mp = NULL;
|
|
return IPPROTO_DONE;
|
|
}
|
|
protoff += offsetof(struct ip6_ext, ip6e_nxt);
|
|
}
|
|
(void) ipsec_common_input(*mp, *offp, protoff, AF_INET6, proto);
|
|
return IPPROTO_DONE;
|
|
}
|
|
|
|
/*
|
|
* IPsec input callback, called by the transform callback. Takes care of
|
|
* filtering and other sanity checks on the processed packet.
|
|
*/
|
|
int
|
|
ipsec6_common_input_cb(struct mbuf *m, struct secasvar *sav, int skip,
|
|
int protoff)
|
|
{
|
|
int af __diagused, sproto;
|
|
struct ip6_hdr *ip6;
|
|
struct secasindex *saidx;
|
|
int nxt;
|
|
u_int8_t prot;
|
|
int error, nest;
|
|
|
|
if (__predict_false(m == NULL)) {
|
|
panic("%s: NULL mbuf", __func__);
|
|
}
|
|
|
|
KASSERT(sav != NULL);
|
|
saidx = &sav->sah->saidx;
|
|
af = saidx->dst.sa.sa_family;
|
|
KASSERTMSG(af == AF_INET6, "unexpected af %u", af);
|
|
sproto = saidx->proto;
|
|
KASSERTMSG(sproto == IPPROTO_ESP || sproto == IPPROTO_AH ||
|
|
sproto == IPPROTO_IPCOMP,
|
|
"unexpected security protocol %u", sproto);
|
|
|
|
/* Fix IPv6 header */
|
|
if (m->m_len < sizeof(struct ip6_hdr) &&
|
|
(m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
|
|
char buf[IPSEC_ADDRSTRLEN];
|
|
IPSECLOG(LOG_DEBUG, "processing failed for SA %s/%08lx\n",
|
|
ipsec_address(&sav->sah->saidx.dst,
|
|
buf, sizeof(buf)), (u_long) ntohl(sav->spi));
|
|
IPSEC_ISTAT(sproto, ESP_STAT_HDROPS, AH_STAT_HDROPS,
|
|
IPCOMP_STAT_HDROPS);
|
|
error = EACCES;
|
|
goto bad;
|
|
}
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
|
|
|
|
m_copydata(m, protoff, sizeof(prot), &prot);
|
|
|
|
key_sa_recordxfer(sav, m);
|
|
|
|
/*
|
|
* See the end of ip6_input for this logic.
|
|
* IPPROTO_IPV[46] case will be processed just like other ones
|
|
*/
|
|
nest = 0;
|
|
nxt = prot;
|
|
while (nxt != IPPROTO_DONE) {
|
|
if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
|
|
IP6_STATINC(IP6_STAT_TOOMANYHDR);
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
|
|
M_VERIFY_PACKET(m);
|
|
|
|
/*
|
|
* Protection against faulty packet - there should be
|
|
* more sanity checks in header chain processing.
|
|
*/
|
|
if (m->m_pkthdr.len < skip) {
|
|
IP6_STATINC(IP6_STAT_TOOSHORT);
|
|
in6_ifstat_inc(m_get_rcvif_NOMPSAFE(m),
|
|
ifs6_in_truncated);
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* Enforce IPsec policy checking if we are seeing last header.
|
|
* Note that we do not visit this with protocols with pcb layer
|
|
* code - like udp/tcp/raw ip.
|
|
*/
|
|
if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
|
|
ipsec_in_reject(m, NULL)) {
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* There is no struct ifnet for tunnel mode IP-IP tunnel connection,
|
|
* so we cannot write filtering rule to the inner packet.
|
|
*/
|
|
if (saidx->mode == IPSEC_MODE_TUNNEL)
|
|
m->m_pkthdr.pkthdr_flags |= PKTHDR_FLAG_IPSEC_SKIP_PFIL;
|
|
|
|
nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &skip, nxt);
|
|
}
|
|
return 0;
|
|
|
|
bad:
|
|
if (m)
|
|
m_freem(m);
|
|
return error;
|
|
}
|
|
#endif /* INET6 */
|