The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/netinet6/ah_output.c

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    1 /*      $FreeBSD: releng/5.4/sys/netinet6/ah_output.c 141090 2005-01-31 23:27:04Z imp $ */
    2 /*      $KAME: ah_output.c,v 1.38 2003/09/06 05:15:43 itojun Exp $      */
    3 
    4 /*-
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 /*
   34  * RFC1826/2402 authentication header.
   35  */
   36 
   37 #include "opt_inet.h"
   38 #include "opt_inet6.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/mbuf.h>
   43 #include <sys/domain.h>
   44 #include <sys/protosw.h>
   45 #include <sys/socket.h>
   46 #include <sys/socketvar.h>
   47 #include <sys/errno.h>
   48 #include <sys/time.h>
   49 #include <sys/syslog.h>
   50 
   51 #include <net/if.h>
   52 #include <net/route.h>
   53 
   54 #include <netinet/in.h>
   55 
   56 #include <netinet/in_systm.h>
   57 #include <netinet/ip.h>
   58 #include <netinet/in_var.h>
   59 
   60 #ifdef INET6
   61 #include <netinet/ip6.h>
   62 #include <netinet6/ip6_var.h>
   63 #include <netinet/icmp6.h>
   64 #endif
   65 
   66 #include <netinet6/ipsec.h>
   67 #ifdef INET6
   68 #include <netinet6/ipsec6.h>
   69 #endif
   70 #include <netinet6/ah.h>
   71 #ifdef INET6
   72 #include <netinet6/ah6.h>
   73 #endif
   74 #include <netkey/key.h>
   75 #include <netkey/keydb.h>
   76 
   77 #include <net/net_osdep.h>
   78 
   79 #ifdef INET
   80 static struct in_addr *ah4_finaldst __P((struct mbuf *));
   81 #endif
   82 
   83 /*
   84  * compute AH header size.
   85  * transport mode only.  for tunnel mode, we should implement
   86  * virtual interface, and control MTU/MSS by the interface MTU.
   87  */
   88 size_t
   89 ah_hdrsiz(isr)
   90         struct ipsecrequest *isr;
   91 {
   92         const struct ah_algorithm *algo;
   93         size_t hdrsiz;
   94 
   95         /* sanity check */
   96         if (isr == NULL)
   97                 panic("ah_hdrsiz: NULL was passed.");
   98 
   99         if (isr->saidx.proto != IPPROTO_AH)
  100                 panic("unsupported mode passed to ah_hdrsiz");
  101 
  102         if (isr->sav == NULL)
  103                 goto estimate;
  104         if (isr->sav->state != SADB_SASTATE_MATURE
  105          && isr->sav->state != SADB_SASTATE_DYING)
  106                 goto estimate;
  107 
  108         /* we need transport mode AH. */
  109         algo = ah_algorithm_lookup(isr->sav->alg_auth);
  110         if (!algo)
  111                 goto estimate;
  112 
  113         /*
  114          * XXX
  115          * right now we don't calcurate the padding size.  simply
  116          * treat the padding size as constant, for simplicity.
  117          *
  118          * XXX variable size padding support
  119          */
  120         hdrsiz = (((*algo->sumsiz)(isr->sav) + 3) & ~(4 - 1));
  121         if (isr->sav->flags & SADB_X_EXT_OLD)
  122                 hdrsiz += sizeof(struct ah);
  123         else
  124                 hdrsiz += sizeof(struct newah);
  125 
  126         return hdrsiz;
  127 
  128     estimate:
  129         /* ASSUMING:
  130          *      sizeof(struct newah) > sizeof(struct ah).
  131          *      AH_MAXSUMSIZE is multiple of 4.
  132          */
  133         return sizeof(struct newah) + AH_MAXSUMSIZE;
  134 }
  135 
  136 #ifdef INET
  137 /*
  138  * Modify the packet so that it includes the authentication data.
  139  * The mbuf passed must start with IPv4 header.
  140  *
  141  * assumes that the first mbuf contains IPv4 header + option only.
  142  * the function does not modify m.
  143  */
  144 int
  145 ah4_output(m, isr)
  146         struct mbuf *m;
  147         struct ipsecrequest *isr;
  148 {
  149         struct secasvar *sav = isr->sav;
  150         const struct ah_algorithm *algo;
  151         u_int32_t spi;
  152         u_char *ahdrpos;
  153         u_int8_t *ahsumpos = NULL;
  154         size_t hlen = 0;        /* IP header+option in bytes */
  155         size_t plen = 0;        /* AH payload size in bytes */
  156         size_t ahlen = 0;       /* plen + sizeof(ah) */
  157         struct ip *ip;
  158         struct in_addr dst;
  159         struct in_addr *finaldst;
  160         int error;
  161 
  162         /* sanity checks */
  163         if ((sav->flags & SADB_X_EXT_OLD) == 0 && !sav->replay) {
  164                 struct ip *ip;
  165 
  166                 ip = mtod(m, struct ip *);
  167                 ipseclog((LOG_DEBUG, "ah4_output: internal error: "
  168                         "sav->replay is null: %x->%x, SPI=%u\n",
  169                         (u_int32_t)ntohl(ip->ip_src.s_addr),
  170                         (u_int32_t)ntohl(ip->ip_dst.s_addr),
  171                         (u_int32_t)ntohl(sav->spi)));
  172                 ipsecstat.out_inval++;
  173                 m_freem(m);
  174                 return EINVAL;
  175         }
  176 
  177         algo = ah_algorithm_lookup(sav->alg_auth);
  178         if (!algo) {
  179                 ipseclog((LOG_ERR, "ah4_output: unsupported algorithm: "
  180                     "SPI=%u\n", (u_int32_t)ntohl(sav->spi)));
  181                 ipsecstat.out_inval++;
  182                 m_freem(m);
  183                 return EINVAL;
  184         }
  185         spi = sav->spi;
  186 
  187         /*
  188          * determine the size to grow.
  189          */
  190         if (sav->flags & SADB_X_EXT_OLD) {
  191                 /* RFC 1826 */
  192                 plen = ((*algo->sumsiz)(sav) + 3) & ~(4 - 1); /* XXX pad to 8byte? */
  193                 ahlen = plen + sizeof(struct ah);
  194         } else {
  195                 /* RFC 2402 */
  196                 plen = ((*algo->sumsiz)(sav) + 3) & ~(4 - 1); /* XXX pad to 8byte? */
  197                 ahlen = plen + sizeof(struct newah);
  198         }
  199 
  200         /*
  201          * grow the mbuf to accomodate AH.
  202          */
  203         ip = mtod(m, struct ip *);
  204 #ifdef _IP_VHL
  205         hlen = IP_VHL_HL(ip->ip_vhl) << 2;
  206 #else
  207         hlen = ip->ip_hl << 2;
  208 #endif
  209 
  210         if (m->m_len != hlen)
  211                 panic("ah4_output: assumption failed (first mbuf length)");
  212         if (M_LEADINGSPACE(m->m_next) < ahlen) {
  213                 struct mbuf *n;
  214                 MGET(n, M_DONTWAIT, MT_DATA);
  215                 if (!n) {
  216                         ipseclog((LOG_DEBUG, "ENOBUFS in ah4_output %d\n",
  217                             __LINE__));
  218                         m_freem(m);
  219                         return ENOBUFS;
  220                 }
  221                 n->m_len = ahlen;
  222                 n->m_next = m->m_next;
  223                 m->m_next = n;
  224                 m->m_pkthdr.len += ahlen;
  225                 ahdrpos = mtod(n, u_char *);
  226         } else {
  227                 m->m_next->m_len += ahlen;
  228                 m->m_next->m_data -= ahlen;
  229                 m->m_pkthdr.len += ahlen;
  230                 ahdrpos = mtod(m->m_next, u_char *);
  231         }
  232 
  233         ip = mtod(m, struct ip *);      /* just to be sure */
  234 
  235         /*
  236          * initialize AH.
  237          */
  238         if (sav->flags & SADB_X_EXT_OLD) {
  239                 struct ah *ahdr;
  240 
  241                 ahdr = (struct ah *)ahdrpos;
  242                 ahsumpos = (u_char *)(ahdr + 1);
  243                 ahdr->ah_len = plen >> 2;
  244                 ahdr->ah_nxt = ip->ip_p;
  245                 ahdr->ah_reserve = htons(0);
  246                 ahdr->ah_spi = spi;
  247                 bzero(ahdr + 1, plen);
  248         } else {
  249                 struct newah *ahdr;
  250 
  251                 ahdr = (struct newah *)ahdrpos;
  252                 ahsumpos = (u_char *)(ahdr + 1);
  253                 ahdr->ah_len = (plen >> 2) + 1; /* plus one for seq# */
  254                 ahdr->ah_nxt = ip->ip_p;
  255                 ahdr->ah_reserve = htons(0);
  256                 ahdr->ah_spi = spi;
  257                 if (sav->replay->count == ~0) {
  258                         if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
  259                                 /* XXX Is it noisy ? */
  260                                 ipseclog((LOG_WARNING,
  261                                     "replay counter overflowed. %s\n",
  262                                     ipsec_logsastr(sav)));
  263                                 ipsecstat.out_inval++;
  264                                 m_freem(m);
  265                                 return EINVAL;
  266                         }
  267                 }
  268                 sav->replay->count++;
  269                 /*
  270                  * XXX sequence number must not be cycled, if the SA is
  271                  * installed by IKE daemon.
  272                  */
  273                 ahdr->ah_seq = htonl(sav->replay->count & 0xffffffff);
  274                 bzero(ahdr + 1, plen);
  275         }
  276 
  277         /*
  278          * modify IPv4 header.
  279          */
  280         ip->ip_p = IPPROTO_AH;
  281         if (ahlen < (IP_MAXPACKET - ntohs(ip->ip_len)))
  282                 ip->ip_len = htons(ntohs(ip->ip_len) + ahlen);
  283         else {
  284                 ipseclog((LOG_ERR, "IPv4 AH output: size exceeds limit\n"));
  285                 ipsecstat.out_inval++;
  286                 m_freem(m);
  287                 return EMSGSIZE;
  288         }
  289 
  290         /*
  291          * If there is source routing option, update destination field in
  292          * the IPv4 header to the final destination.
  293          * Note that we do not need to update source routing option itself
  294          * (as done in IPv4 AH processing -- see ip6_output()), since
  295          * source routing option is not part of the ICV computation.
  296          */
  297         finaldst = ah4_finaldst(m);
  298         if (finaldst) {
  299                 dst.s_addr = ip->ip_dst.s_addr;
  300                 ip->ip_dst.s_addr = finaldst->s_addr;
  301         }
  302 
  303         /*
  304          * calcurate the checksum, based on security association
  305          * and the algorithm specified.
  306          */
  307         error = ah4_calccksum(m, ahsumpos, plen, algo, sav);
  308         if (error) {
  309                 ipseclog((LOG_ERR,
  310                     "error after ah4_calccksum, called from ah4_output"));
  311                 m_freem(m);
  312                 m = NULL;
  313                 ipsecstat.out_inval++;
  314                 return error;
  315         }
  316 
  317         if (finaldst) {
  318                 ip = mtod(m, struct ip *);      /* just to make sure */
  319                 ip->ip_dst.s_addr = dst.s_addr;
  320         }
  321         ipsecstat.out_success++;
  322         ipsecstat.out_ahhist[sav->alg_auth]++;
  323         key_sa_recordxfer(sav, m);
  324 
  325         return 0;
  326 }
  327 #endif
  328 
  329 /* Calculate AH length */
  330 int
  331 ah_hdrlen(sav)
  332         struct secasvar *sav;
  333 {
  334         const struct ah_algorithm *algo;
  335         int plen, ahlen;
  336 
  337         algo = ah_algorithm_lookup(sav->alg_auth);
  338         if (!algo)
  339                 return 0;
  340         if (sav->flags & SADB_X_EXT_OLD) {
  341                 /* RFC 1826 */
  342                 plen = ((*algo->sumsiz)(sav) + 3) & ~(4 - 1);   /* XXX pad to 8byte? */
  343                 ahlen = plen + sizeof(struct ah);
  344         } else {
  345                 /* RFC 2402 */
  346                 plen = ((*algo->sumsiz)(sav) + 3) & ~(4 - 1);   /* XXX pad to 8byte? */
  347                 ahlen = plen + sizeof(struct newah);
  348         }
  349 
  350         return (ahlen);
  351 }
  352 
  353 #ifdef INET6
  354 /*
  355  * Fill in the Authentication Header and calculate checksum.
  356  */
  357 int
  358 ah6_output(m, nexthdrp, md, isr)
  359         struct mbuf *m;
  360         u_char *nexthdrp;
  361         struct mbuf *md;
  362         struct ipsecrequest *isr;
  363 {
  364         struct mbuf *mprev;
  365         struct mbuf *mah;
  366         struct secasvar *sav = isr->sav;
  367         const struct ah_algorithm *algo;
  368         u_int32_t spi;
  369         u_int8_t *ahsumpos = NULL;
  370         size_t plen;    /* AH payload size in bytes */
  371         int error = 0;
  372         int ahlen;
  373         struct ip6_hdr *ip6;
  374 
  375         if (m->m_len < sizeof(struct ip6_hdr)) {
  376                 ipseclog((LOG_DEBUG, "ah6_output: first mbuf too short\n"));
  377                 m_freem(m);
  378                 return EINVAL;
  379         }
  380 
  381         ahlen = ah_hdrlen(sav);
  382         if (ahlen == 0)
  383                 return 0;
  384 
  385         for (mprev = m; mprev && mprev->m_next != md; mprev = mprev->m_next)
  386                 ;
  387         if (!mprev || mprev->m_next != md) {
  388                 ipseclog((LOG_DEBUG, "ah6_output: md is not in chain\n"));
  389                 m_freem(m);
  390                 return EINVAL;
  391         }
  392 
  393         MGET(mah, M_DONTWAIT, MT_DATA);
  394         if (!mah) {
  395                 m_freem(m);
  396                 return ENOBUFS;
  397         }
  398         if (ahlen > MLEN) {
  399                 MCLGET(mah, M_DONTWAIT);
  400                 if ((mah->m_flags & M_EXT) == 0) {
  401                         m_free(mah);
  402                         m_freem(m);
  403                         return ENOBUFS;
  404                 }
  405         }
  406         mah->m_len = ahlen;
  407         mah->m_next = md;
  408         mprev->m_next = mah;
  409         m->m_pkthdr.len += ahlen;
  410 
  411         /* fix plen */
  412         if (m->m_pkthdr.len - sizeof(struct ip6_hdr) > IPV6_MAXPACKET) {
  413                 ipseclog((LOG_ERR,
  414                     "ah6_output: AH with IPv6 jumbogram is not supported\n"));
  415                 m_freem(m);
  416                 return EINVAL;
  417         }
  418         ip6 = mtod(m, struct ip6_hdr *);
  419         ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
  420 
  421         if ((sav->flags & SADB_X_EXT_OLD) == 0 && !sav->replay) {
  422                 ipseclog((LOG_DEBUG, "ah6_output: internal error: "
  423                         "sav->replay is null: SPI=%u\n",
  424                         (u_int32_t)ntohl(sav->spi)));
  425                 ipsec6stat.out_inval++;
  426                 m_freem(m);
  427                 return EINVAL;
  428         }
  429 
  430         algo = ah_algorithm_lookup(sav->alg_auth);
  431         if (!algo) {
  432                 ipseclog((LOG_ERR, "ah6_output: unsupported algorithm: "
  433                     "SPI=%u\n", (u_int32_t)ntohl(sav->spi)));
  434                 ipsec6stat.out_inval++;
  435                 m_freem(m);
  436                 return EINVAL;
  437         }
  438         spi = sav->spi;
  439 
  440         /*
  441          * initialize AH.
  442          */
  443         if (sav->flags & SADB_X_EXT_OLD) {
  444                 struct ah *ahdr = mtod(mah, struct ah *);
  445 
  446                 plen = mah->m_len - sizeof(struct ah);
  447                 ahsumpos = (u_char *)(ahdr + 1);
  448                 ahdr->ah_nxt = *nexthdrp;
  449                 *nexthdrp = IPPROTO_AH;
  450                 ahdr->ah_len = plen >> 2;
  451                 ahdr->ah_reserve = htons(0);
  452                 ahdr->ah_spi = spi;
  453                 bzero(ahdr + 1, plen);
  454         } else {
  455                 struct newah *ahdr = mtod(mah, struct newah *);
  456 
  457                 plen = mah->m_len - sizeof(struct newah);
  458                 ahsumpos = (u_char *)(ahdr + 1);
  459                 ahdr->ah_nxt = *nexthdrp;
  460                 *nexthdrp = IPPROTO_AH;
  461                 ahdr->ah_len = (plen >> 2) + 1; /* plus one for seq# */
  462                 ahdr->ah_reserve = htons(0);
  463                 ahdr->ah_spi = spi;
  464                 if (sav->replay->count == ~0) {
  465                         if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
  466                                 /* XXX Is it noisy ? */
  467                                 ipseclog((LOG_WARNING,
  468                                     "replay counter overflowed. %s\n",
  469                                     ipsec_logsastr(sav)));
  470                                 ipsec6stat.out_inval++;
  471                                 m_freem(m);
  472                                 return EINVAL;
  473                         }
  474                 }
  475                 sav->replay->count++;
  476                 /*
  477                  * XXX sequence number must not be cycled, if the SA is
  478                  * installed by IKE daemon.
  479                  */
  480                 ahdr->ah_seq = htonl(sav->replay->count);
  481                 bzero(ahdr + 1, plen);
  482         }
  483 
  484         /*
  485          * calcurate the checksum, based on security association
  486          * and the algorithm specified.
  487          */
  488         error = ah6_calccksum(m, ahsumpos, plen, algo, sav);
  489         if (error) {
  490                 ipsec6stat.out_inval++;
  491                 m_freem(m);
  492         } else {
  493                 ipsec6stat.out_success++;
  494                 key_sa_recordxfer(sav, m);
  495         }
  496         ipsec6stat.out_ahhist[sav->alg_auth]++;
  497 
  498         return (error);
  499 }
  500 #endif
  501 
  502 #ifdef INET
  503 /*
  504  * Find the final destination if there is loose/strict source routing option.
  505  * Returns NULL if there's no source routing options.
  506  * Returns NULL on errors too.
  507  * Note that this function will return a pointer INTO the given parameter,
  508  * struct mbuf *m.
  509  * The mbuf must be pulled up toward, at least, ip option part.
  510  */
  511 static struct in_addr *
  512 ah4_finaldst(m)
  513         struct mbuf *m;
  514 {
  515         struct ip *ip;
  516         int optlen;
  517         u_char *q;
  518         int i;
  519         int hlen;
  520 
  521         if (!m)
  522                 panic("ah4_finaldst: m == NULL");
  523         ip = mtod(m, struct ip *);
  524         hlen = (ip->ip_hl << 2);
  525 
  526         if (m->m_len < hlen) {
  527                 ipseclog((LOG_DEBUG,
  528                     "ah4_finaldst: parameter mbuf wrong (not pulled up)\n"));
  529                 return NULL;
  530         }
  531 
  532         if (hlen == sizeof(struct ip))
  533                 return NULL;
  534 
  535         optlen = hlen - sizeof(struct ip);
  536         if (optlen < 0) {
  537                 ipseclog((LOG_DEBUG, "ah4_finaldst: wrong optlen %d\n",
  538                     optlen));
  539                 return NULL;
  540         }
  541 
  542         q = (u_char *)(ip + 1);
  543         i = 0;
  544         while (i < optlen) {
  545                 if (i + IPOPT_OPTVAL >= optlen)
  546                         return NULL;
  547                 if (q[i + IPOPT_OPTVAL] == IPOPT_EOL ||
  548                     q[i + IPOPT_OPTVAL] == IPOPT_NOP ||
  549                     i + IPOPT_OLEN < optlen)
  550                         ;
  551                 else
  552                         return NULL;
  553 
  554                 switch (q[i + IPOPT_OPTVAL]) {
  555                 case IPOPT_EOL:
  556                         i = optlen;     /* bye */
  557                         break;
  558                 case IPOPT_NOP:
  559                         i++;
  560                         break;
  561                 case IPOPT_LSRR:
  562                 case IPOPT_SSRR:
  563                         if (q[i + IPOPT_OLEN] < 2 + sizeof(struct in_addr) ||
  564                             optlen - i < q[i + IPOPT_OLEN]) {
  565                                 ipseclog((LOG_ERR,
  566                                     "ip_finaldst: invalid IP option "
  567                                     "(code=%02x len=%02x)\n",
  568                                     q[i + IPOPT_OPTVAL], q[i + IPOPT_OLEN]));
  569                                 return NULL;
  570                         }
  571                         i += q[i + IPOPT_OLEN] - sizeof(struct in_addr);
  572                         return (struct in_addr *)(q + i);
  573                 default:
  574                         if (q[i + IPOPT_OLEN] < 2 ||
  575                             optlen - i < q[i + IPOPT_OLEN]) {
  576                                 ipseclog((LOG_ERR,
  577                                     "ip_finaldst: invalid IP option "
  578                                     "(code=%02x len=%02x)\n",
  579                                     q[i + IPOPT_OPTVAL], q[i + IPOPT_OLEN]));
  580                                 return NULL;
  581                         }
  582                         i += q[i + IPOPT_OLEN];
  583                         break;
  584                 }
  585         }
  586         return NULL;
  587 }
  588 #endif

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