mirror of
https://github.com/freebsd/freebsd-src
synced 2024-09-20 00:33:57 +00:00
686cdd19b1
API changes: - additional IPv6 ioctls - IPsec PF_KEY API was changed, it is mandatory to upgrade setkey(8). (also syntax change)
693 lines
15 KiB
C
693 lines
15 KiB
C
/* $FreeBSD$ */
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/* $KAME: esp_output.c,v 1.22 2000/07/03 13:23:28 itojun 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 "opt_inet.h"
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#include "opt_inet6.h"
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/*
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* RFC1827/2406 Encapsulated Security Payload.
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*/
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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/socketvar.h>
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#include <sys/errno.h>
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#include <sys/time.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/in_var.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet/icmp6.h>
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#endif
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#include <netinet6/ipsec.h>
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#ifdef INET6
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#include <netinet6/ipsec6.h>
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#endif
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#include <netinet6/ah.h>
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#ifdef INET6
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#include <netinet6/ah6.h>
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#endif
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#include <netinet6/esp.h>
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#ifdef INET6
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#include <netinet6/esp6.h>
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#endif
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#include <netkey/key.h>
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#include <netkey/keydb.h>
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#include <net/net_osdep.h>
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static int esp_output __P((struct mbuf *, u_char *, struct mbuf *,
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struct ipsecrequest *, int));
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/*
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* compute ESP header size.
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*/
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size_t
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esp_hdrsiz(isr)
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struct ipsecrequest *isr;
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{
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struct secasvar *sav;
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struct esp_algorithm *algo;
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size_t ivlen;
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size_t authlen;
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size_t hdrsiz;
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/* sanity check */
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if (isr == NULL)
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panic("esp_hdrsiz: NULL was passed.\n");
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sav = isr->sav;
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if (isr->saidx.proto != IPPROTO_ESP)
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panic("unsupported mode passed to esp_hdrsiz");
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if (sav == NULL)
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goto estimate;
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if (sav->state != SADB_SASTATE_MATURE
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&& sav->state != SADB_SASTATE_DYING)
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goto estimate;
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/* we need transport mode ESP. */
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algo = &esp_algorithms[sav->alg_enc];
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if (!algo)
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goto estimate;
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ivlen = sav->ivlen;
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if (ivlen < 0)
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goto estimate;
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/*
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* XXX
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* right now we don't calcurate the padding size. simply
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* treat the padding size as constant, for simplicity.
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*
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* XXX variable size padding support
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*/
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if (sav->flags & SADB_X_EXT_OLD) {
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/* RFC 1827 */
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hdrsiz = sizeof(struct esp) + ivlen + 9;
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} else {
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/* RFC 2406 */
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if (sav->replay && sav->alg_auth && sav->key_auth)
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authlen = (*ah_algorithms[sav->alg_auth].sumsiz)(sav);
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else
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authlen = 0;
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hdrsiz = sizeof(struct newesp) + ivlen + 9 + authlen;
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}
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return hdrsiz;
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estimate:
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/*
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* ASSUMING:
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* sizeof(struct newesp) > sizeof(struct esp).
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* 8 = ivlen for CBC mode (RFC2451).
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* 9 = (maximum padding length without random padding length)
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* + (Pad Length field) + (Next Header field).
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* 16 = maximum ICV we support.
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*/
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return sizeof(struct newesp) + 8 + 9 + 16;
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}
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/*
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* Modify the packet so that the payload is encrypted.
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* The mbuf (m) must start with IPv4 or IPv6 header.
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* On failure, free the given mbuf and return NULL.
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*
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* on invocation:
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* m nexthdrp md
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* v v v
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* IP ......... payload
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* during the encryption:
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* m nexthdrp mprev md
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* v v v v
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* IP ............... esp iv payload pad padlen nxthdr
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* <--><-><------><--------------->
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* esplen plen extendsiz
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* ivlen
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* <-----> esphlen
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* <-> hlen
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* <-----------------> espoff
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*/
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static int
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esp_output(m, nexthdrp, md, isr, af)
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struct mbuf *m;
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u_char *nexthdrp;
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struct mbuf *md;
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struct ipsecrequest *isr;
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int af;
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{
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struct mbuf *n;
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struct mbuf *mprev;
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struct esp *esp;
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struct esptail *esptail;
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struct secasvar *sav = isr->sav;
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struct esp_algorithm *algo;
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u_int32_t spi;
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u_int8_t nxt = 0;
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size_t plen; /*payload length to be encrypted*/
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size_t espoff;
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int ivlen;
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int afnumber;
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size_t extendsiz;
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int error = 0;
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switch (af) {
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#ifdef INET
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case AF_INET:
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afnumber = 4;
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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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afnumber = 6;
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break;
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#endif
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default:
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ipseclog((LOG_ERR, "esp_output: unsupported af %d\n", af));
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return 0; /* no change at all */
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}
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/* some sanity check */
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if ((sav->flags & SADB_X_EXT_OLD) == 0 && !sav->replay) {
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switch (af) {
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#ifdef INET
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case AF_INET:
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{
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struct ip *ip;
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ip = mtod(m, struct ip *);
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ipseclog((LOG_DEBUG, "esp4_output: internal error: "
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"sav->replay is null: %x->%x, SPI=%u\n",
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(u_int32_t)ntohl(ip->ip_src.s_addr),
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(u_int32_t)ntohl(ip->ip_dst.s_addr),
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(u_int32_t)ntohl(sav->spi)));
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ipsecstat.out_inval++;
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m_freem(m);
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return EINVAL;
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}
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#endif /*INET*/
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#ifdef INET6
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case AF_INET6:
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{
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struct ip6_hdr *ip6;
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ip6 = mtod(m, struct ip6_hdr *);
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ipseclog((LOG_DEBUG, "esp6_output: internal error: "
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"sav->replay is null: SPI=%u\n",
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(u_int32_t)ntohl(sav->spi)));
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ipsec6stat.out_inval++;
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m_freem(m);
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return EINVAL;
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}
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#endif /*INET6*/
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}
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}
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algo = &esp_algorithms[sav->alg_enc]; /*XXX*/
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spi = sav->spi;
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ivlen = sav->ivlen;
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/* should be okey */
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if (ivlen < 0) {
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panic("invalid ivlen");
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}
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{
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/*
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* insert ESP header.
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* XXX inserts ESP header right after IPv4 header. should
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* chase the header chain.
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* XXX sequential number
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*/
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#ifdef INET
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struct ip *ip = NULL;
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#endif
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#ifdef INET6
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struct ip6_hdr *ip6 = NULL;
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#endif
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size_t esplen; /*sizeof(struct esp/newesp)*/
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size_t esphlen; /*sizeof(struct esp/newesp) + ivlen*/
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size_t hlen = 0; /*ip header len*/
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if (sav->flags & SADB_X_EXT_OLD) {
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/* RFC 1827 */
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esplen = sizeof(struct esp);
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} else {
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/* RFC 2406 */
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if (sav->flags & SADB_X_EXT_DERIV)
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esplen = sizeof(struct esp);
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else
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esplen = sizeof(struct newesp);
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}
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esphlen = esplen + ivlen;
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for (mprev = m; mprev && mprev->m_next != md; mprev = mprev->m_next)
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;
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if (mprev == NULL || mprev->m_next != md) {
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ipseclog((LOG_DEBUG, "esp%d_output: md is not in chain\n",
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afnumber));
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m_freem(m);
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return EINVAL;
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}
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plen = 0;
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for (n = md; n; n = n->m_next)
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plen += n->m_len;
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switch (af) {
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#ifdef INET
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case AF_INET:
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ip = mtod(m, struct ip *);
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#ifdef _IP_VHL
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hlen = IP_VHL_HL(ip->ip_vhl) << 2;
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#else
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hlen = ip->ip_hl << 2;
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#endif
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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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ip6 = mtod(m, struct ip6_hdr *);
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hlen = sizeof(*ip6);
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break;
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#endif
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}
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/* make the packet over-writable */
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mprev->m_next = NULL;
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if ((md = ipsec_copypkt(md)) == NULL) {
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m_freem(m);
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error = ENOBUFS;
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goto fail;
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}
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mprev->m_next = md;
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espoff = m->m_pkthdr.len - plen;
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/*
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* grow the mbuf to accomodate ESP header.
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* before: IP ... payload
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* after: IP ... ESP IV payload
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*/
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if (M_LEADINGSPACE(md) < esphlen) {
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MGET(n, M_DONTWAIT, MT_DATA);
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if (!n) {
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m_freem(m);
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error = ENOBUFS;
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goto fail;
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}
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n->m_len = esphlen;
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mprev->m_next = n;
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n->m_next = md;
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m->m_pkthdr.len += esphlen;
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esp = mtod(n, struct esp *);
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} else {
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md->m_len += esphlen;
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md->m_data -= esphlen;
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m->m_pkthdr.len += esphlen;
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esp = mtod(md, struct esp *);
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}
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nxt = *nexthdrp;
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*nexthdrp = IPPROTO_ESP;
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switch (af) {
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#ifdef INET
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case AF_INET:
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if (esphlen < (IP_MAXPACKET - ntohs(ip->ip_len)))
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ip->ip_len = htons(ntohs(ip->ip_len) + esphlen);
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else {
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ipseclog((LOG_ERR,
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"IPv4 ESP output: size exceeds limit\n"));
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ipsecstat.out_inval++;
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m_freem(m);
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error = EMSGSIZE;
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goto fail;
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}
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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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/* total packet length will be computed in ip6_output() */
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break;
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#endif
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}
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}
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/* initialize esp header. */
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esp->esp_spi = spi;
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if ((sav->flags & SADB_X_EXT_OLD) == 0) {
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struct newesp *nesp;
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nesp = (struct newesp *)esp;
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if (sav->replay->count == ~0) {
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if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
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/* XXX Is it noisy ? */
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ipseclog((LOG_WARNING,
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"replay counter overflowed. %s\n",
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ipsec_logsastr(sav)));
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ipsecstat.out_inval++;
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m_freem(m);
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return EINVAL;
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}
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}
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sav->replay->count++;
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/*
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* XXX sequence number must not be cycled, if the SA is
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* installed by IKE daemon.
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*/
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nesp->esp_seq = htonl(sav->replay->count);
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}
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{
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/*
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* find the last mbuf. make some room for ESP trailer.
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* XXX new-esp authentication data
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*/
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#ifdef INET
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struct ip *ip = NULL;
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#endif
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size_t padbound;
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u_char *extend;
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int i;
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if (algo->padbound)
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padbound = algo->padbound;
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else
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padbound = 4;
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/* ESP packet, including nxthdr field, must be length of 4n */
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if (padbound < 4)
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padbound = 4;
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extendsiz = padbound - (plen % padbound);
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if (extendsiz == 1)
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extendsiz = padbound + 1;
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n = m;
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while (n->m_next)
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n = n->m_next;
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/*
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* if M_EXT, the external part may be shared among
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* two consequtive TCP packets.
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*/
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if (!(n->m_flags & M_EXT) && extendsiz < M_TRAILINGSPACE(n)) {
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extend = mtod(n, u_char *) + n->m_len;
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n->m_len += extendsiz;
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m->m_pkthdr.len += extendsiz;
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} else {
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struct mbuf *nn;
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MGET(nn, M_DONTWAIT, MT_DATA);
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if (!nn) {
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ipseclog((LOG_DEBUG, "esp%d_output: can't alloc mbuf",
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afnumber));
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m_freem(m);
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error = ENOBUFS;
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goto fail;
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}
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extend = mtod(nn, u_char *);
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nn->m_len = extendsiz;
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nn->m_next = NULL;
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n->m_next = nn;
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n = nn;
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m->m_pkthdr.len += extendsiz;
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}
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switch (sav->flags & SADB_X_EXT_PMASK) {
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case SADB_X_EXT_PRAND:
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for (i = 0; i < extendsiz; i++)
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extend[i] = random() & 0xff;
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break;
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case SADB_X_EXT_PZERO:
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bzero(extend, extendsiz);
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break;
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case SADB_X_EXT_PSEQ:
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for (i = 0; i < extendsiz; i++)
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extend[i] = (i + 1) & 0xff;
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break;
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}
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/* initialize esp trailer. */
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esptail = (struct esptail *)
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(mtod(n, u_int8_t *) + n->m_len - sizeof(struct esptail));
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esptail->esp_nxt = nxt;
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esptail->esp_padlen = extendsiz - 2;
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/* modify IP header (for ESP header part only) */
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switch (af) {
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#ifdef INET
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case AF_INET:
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ip = mtod(m, struct ip *);
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if (extendsiz < (IP_MAXPACKET - ntohs(ip->ip_len)))
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ip->ip_len = htons(ntohs(ip->ip_len) + extendsiz);
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else {
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ipseclog((LOG_ERR,
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"IPv4 ESP output: size exceeds limit\n"));
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ipsecstat.out_inval++;
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m_freem(m);
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error = EMSGSIZE;
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goto fail;
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}
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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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/* total packet length will be computed in ip6_output() */
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break;
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#endif
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}
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}
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/*
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* encrypt the packet, based on security association
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* and the algorithm specified.
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*/
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if (!algo->encrypt)
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panic("internal error: no encrypt function");
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if ((*algo->encrypt)(m, espoff, plen + extendsiz, sav, algo, ivlen)) {
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ipseclog((LOG_ERR, "packet encryption failure\n"));
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m_freem(m);
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switch (af) {
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#ifdef INET
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case AF_INET:
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ipsecstat.out_inval++;
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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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ipsec6stat.out_inval++;
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break;
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#endif
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}
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error = EINVAL;
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goto fail;
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}
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/*
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* calculate ICV if required.
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*/
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if (!sav->replay)
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goto noantireplay;
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if (!sav->key_auth)
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goto noantireplay;
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if (!sav->alg_auth)
|
|
goto noantireplay;
|
|
{
|
|
u_char authbuf[AH_MAXSUMSIZE];
|
|
struct mbuf *n;
|
|
u_char *p;
|
|
size_t siz;
|
|
struct ip *ip;
|
|
|
|
siz = (((*ah_algorithms[sav->alg_auth].sumsiz)(sav) + 3) & ~(4 - 1));
|
|
if (AH_MAXSUMSIZE < siz)
|
|
panic("assertion failed for AH_MAXSUMSIZE");
|
|
|
|
if (esp_auth(m, espoff, m->m_pkthdr.len - espoff, sav, authbuf)) {
|
|
ipseclog((LOG_ERR, "ESP checksum generation failure\n"));
|
|
m_freem(m);
|
|
error = EINVAL;
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
ipsecstat.out_inval++;
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
ipsec6stat.out_inval++;
|
|
break;
|
|
#endif
|
|
}
|
|
goto fail;
|
|
}
|
|
|
|
n = m;
|
|
while (n->m_next)
|
|
n = n->m_next;
|
|
|
|
if (!(n->m_flags & M_EXT) && siz < M_TRAILINGSPACE(n)) { /*XXX*/
|
|
n->m_len += siz;
|
|
m->m_pkthdr.len += siz;
|
|
p = mtod(n, u_char *) + n->m_len - siz;
|
|
} else {
|
|
struct mbuf *nn;
|
|
|
|
MGET(nn, M_DONTWAIT, MT_DATA);
|
|
if (!nn) {
|
|
ipseclog((LOG_DEBUG, "can't alloc mbuf in esp%d_output",
|
|
afnumber));
|
|
m_freem(m);
|
|
error = ENOBUFS;
|
|
goto fail;
|
|
}
|
|
nn->m_len = siz;
|
|
nn->m_next = NULL;
|
|
n->m_next = nn;
|
|
n = nn;
|
|
m->m_pkthdr.len += siz;
|
|
p = mtod(nn, u_char *);
|
|
}
|
|
bcopy(authbuf, p, siz);
|
|
|
|
/* modify IP header (for ESP header part only) */
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
ip = mtod(m, struct ip *);
|
|
if (siz < (IP_MAXPACKET - ntohs(ip->ip_len)))
|
|
ip->ip_len = htons(ntohs(ip->ip_len) + siz);
|
|
else {
|
|
ipseclog((LOG_ERR,
|
|
"IPv4 ESP output: size exceeds limit\n"));
|
|
ipsecstat.out_inval++;
|
|
m_freem(m);
|
|
error = EMSGSIZE;
|
|
goto fail;
|
|
}
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
/* total packet length will be computed in ip6_output() */
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
noantireplay:
|
|
if (!m) {
|
|
ipseclog((LOG_ERR,
|
|
"NULL mbuf after encryption in esp%d_output", afnumber));
|
|
} else {
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
ipsecstat.out_success++;
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
ipsec6stat.out_success++;
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
ipsecstat.out_esphist[sav->alg_enc]++;
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
ipsec6stat.out_esphist[sav->alg_enc]++;
|
|
break;
|
|
#endif
|
|
}
|
|
key_sa_recordxfer(sav, m);
|
|
return 0;
|
|
|
|
fail:
|
|
#if 1
|
|
return error;
|
|
#else
|
|
panic("something bad in esp_output");
|
|
#endif
|
|
}
|
|
|
|
#ifdef INET
|
|
int
|
|
esp4_output(m, isr)
|
|
struct mbuf *m;
|
|
struct ipsecrequest *isr;
|
|
{
|
|
struct ip *ip;
|
|
if (m->m_len < sizeof(struct ip)) {
|
|
ipseclog((LOG_DEBUG, "esp4_output: first mbuf too short\n"));
|
|
m_freem(m);
|
|
return 0;
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
/* XXX assumes that m->m_next points to payload */
|
|
return esp_output(m, &ip->ip_p, m->m_next, isr, AF_INET);
|
|
}
|
|
#endif /*INET*/
|
|
|
|
#ifdef INET6
|
|
int
|
|
esp6_output(m, nexthdrp, md, isr)
|
|
struct mbuf *m;
|
|
u_char *nexthdrp;
|
|
struct mbuf *md;
|
|
struct ipsecrequest *isr;
|
|
{
|
|
if (m->m_len < sizeof(struct ip6_hdr)) {
|
|
ipseclog((LOG_DEBUG, "esp6_output: first mbuf too short\n"));
|
|
m_freem(m);
|
|
return 0;
|
|
}
|
|
return esp_output(m, nexthdrp, md, isr, AF_INET6);
|
|
}
|
|
#endif /*INET6*/
|