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

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    1 /*      $FreeBSD$       */
    2 /*      $OpenBSD: ip_ah.c,v 1.63 2001/06/26 06:18:58 angelos Exp $ */
    3 /*-
    4  * The authors of this code are John Ioannidis (ji@tla.org),
    5  * Angelos D. Keromytis (kermit@csd.uch.gr) and
    6  * Niels Provos (provos@physnet.uni-hamburg.de).
    7  *
    8  * The original version of this code was written by John Ioannidis
    9  * for BSD/OS in Athens, Greece, in November 1995.
   10  *
   11  * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
   12  * by Angelos D. Keromytis.
   13  *
   14  * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
   15  * and Niels Provos.
   16  *
   17  * Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist.
   18  *
   19  * Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
   20  * Angelos D. Keromytis and Niels Provos.
   21  * Copyright (c) 1999 Niklas Hallqvist.
   22  * Copyright (c) 2001 Angelos D. Keromytis.
   23  *
   24  * Permission to use, copy, and modify this software with or without fee
   25  * is hereby granted, provided that this entire notice is included in
   26  * all copies of any software which is or includes a copy or
   27  * modification of this software.
   28  * You may use this code under the GNU public license if you so wish. Please
   29  * contribute changes back to the authors under this freer than GPL license
   30  * so that we may further the use of strong encryption without limitations to
   31  * all.
   32  *
   33  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
   34  * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
   35  * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
   36  * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
   37  * PURPOSE.
   38  */
   39 #include "opt_inet.h"
   40 #include "opt_inet6.h"
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/mbuf.h>
   45 #include <sys/socket.h>
   46 #include <sys/syslog.h>
   47 #include <sys/kernel.h>
   48 #include <sys/sysctl.h>
   49 
   50 #include <net/if.h>
   51 
   52 #include <netinet/in.h>
   53 #include <netinet/in_systm.h>
   54 #include <netinet/ip.h>
   55 #include <netinet/ip_ecn.h>
   56 #include <netinet/ip6.h>
   57 
   58 #include <net/route.h>
   59 #include <netipsec/ipsec.h>
   60 #include <netipsec/ah.h>
   61 #include <netipsec/ah_var.h>
   62 #include <netipsec/xform.h>
   63 
   64 #ifdef INET6
   65 #include <netinet6/ip6_var.h>
   66 #include <netipsec/ipsec6.h>
   67 #include <netinet6/ip6_ecn.h>
   68 #endif
   69 
   70 #include <netipsec/key.h>
   71 #include <netipsec/key_debug.h>
   72 
   73 #include <opencrypto/cryptodev.h>
   74 
   75 /*
   76  * Return header size in bytes.  The old protocol did not support
   77  * the replay counter; the new protocol always includes the counter.
   78  */
   79 #define HDRSIZE(sav) \
   80         (((sav)->flags & SADB_X_EXT_OLD) ? \
   81                 sizeof (struct ah) : sizeof (struct ah) + sizeof (u_int32_t))
   82 /* 
   83  * Return authenticator size in bytes.  The old protocol is known
   84  * to use a fixed 16-byte authenticator.  The new algorithm use 12-byte
   85  * authenticator.
   86  */
   87 #define AUTHSIZE(sav) \
   88         ((sav->flags & SADB_X_EXT_OLD) ? 16 : AH_HMAC_HASHLEN)
   89 
   90 int     ah_enable = 1;                  /* control flow of packets with AH */
   91 int     ah_cleartos = 1;                /* clear ip_tos when doing AH calc */
   92 struct  ahstat ahstat;
   93 
   94 SYSCTL_DECL(_net_inet_ah);
   95 SYSCTL_INT(_net_inet_ah, OID_AUTO,
   96         ah_enable,      CTLFLAG_RW,     &ah_enable,     0, "");
   97 SYSCTL_INT(_net_inet_ah, OID_AUTO,
   98         ah_cleartos,    CTLFLAG_RW,     &ah_cleartos,   0, "");
   99 SYSCTL_STRUCT(_net_inet_ah, IPSECCTL_STATS,
  100         stats,          CTLFLAG_RD,     &ahstat,        ahstat, "");
  101 
  102 static unsigned char ipseczeroes[256];  /* larger than an ip6 extension hdr */
  103 
  104 static int ah_input_cb(struct cryptop*);
  105 static int ah_output_cb(struct cryptop*);
  106 
  107 /*
  108  * NB: this is public for use by the PF_KEY support.
  109  */
  110 struct auth_hash *
  111 ah_algorithm_lookup(int alg)
  112 {
  113         if (alg > SADB_AALG_MAX)
  114                 return NULL;
  115         switch (alg) {
  116         case SADB_X_AALG_NULL:
  117                 return &auth_hash_null;
  118         case SADB_AALG_MD5HMAC:
  119                 return &auth_hash_hmac_md5;
  120         case SADB_AALG_SHA1HMAC:
  121                 return &auth_hash_hmac_sha1;
  122         case SADB_X_AALG_RIPEMD160HMAC:
  123                 return &auth_hash_hmac_ripemd_160;
  124         case SADB_X_AALG_MD5:
  125                 return &auth_hash_key_md5;
  126         case SADB_X_AALG_SHA:
  127                 return &auth_hash_key_sha1;
  128         case SADB_X_AALG_SHA2_256:
  129                 return &auth_hash_hmac_sha2_256;
  130         case SADB_X_AALG_SHA2_384:
  131                 return &auth_hash_hmac_sha2_384;
  132         case SADB_X_AALG_SHA2_512:
  133                 return &auth_hash_hmac_sha2_512;
  134         }
  135         return NULL;
  136 }
  137 
  138 size_t
  139 ah_hdrsiz(struct secasvar *sav)
  140 {
  141         size_t size;
  142 
  143         if (sav != NULL) {
  144                 int authsize;
  145                 IPSEC_ASSERT(sav->tdb_authalgxform != NULL, ("null xform"));
  146                 /*XXX not right for null algorithm--does it matter??*/
  147                 authsize = AUTHSIZE(sav);
  148                 size = roundup(authsize, sizeof (u_int32_t)) + HDRSIZE(sav);
  149         } else {
  150                 /* default guess */
  151                 size = sizeof (struct ah) + sizeof (u_int32_t) + 16;
  152         }
  153         return size;
  154 }
  155 
  156 /*
  157  * NB: public for use by esp_init.
  158  */
  159 int
  160 ah_init0(struct secasvar *sav, struct xformsw *xsp, struct cryptoini *cria)
  161 {
  162         struct auth_hash *thash;
  163         int keylen;
  164 
  165         thash = ah_algorithm_lookup(sav->alg_auth);
  166         if (thash == NULL) {
  167                 DPRINTF(("%s: unsupported authentication algorithm %u\n",
  168                         __func__, sav->alg_auth));
  169                 return EINVAL;
  170         }
  171         /*
  172          * Verify the replay state block allocation is consistent with
  173          * the protocol type.  We check here so we can make assumptions
  174          * later during protocol processing.
  175          */
  176         /* NB: replay state is setup elsewhere (sigh) */
  177         if (((sav->flags&SADB_X_EXT_OLD) == 0) ^ (sav->replay != NULL)) {
  178                 DPRINTF(("%s: replay state block inconsistency, "
  179                         "%s algorithm %s replay state\n", __func__,
  180                         (sav->flags & SADB_X_EXT_OLD) ? "old" : "new",
  181                         sav->replay == NULL ? "without" : "with"));
  182                 return EINVAL;
  183         }
  184         if (sav->key_auth == NULL) {
  185                 DPRINTF(("%s: no authentication key for %s algorithm\n",
  186                         __func__, thash->name));
  187                 return EINVAL;
  188         }
  189         keylen = _KEYLEN(sav->key_auth);
  190         if (keylen != thash->keysize && thash->keysize != 0) {
  191                 DPRINTF(("%s: invalid keylength %d, algorithm %s requires "
  192                         "keysize %d\n", __func__,
  193                          keylen, thash->name, thash->keysize));
  194                 return EINVAL;
  195         }
  196 
  197         sav->tdb_xform = xsp;
  198         sav->tdb_authalgxform = thash;
  199 
  200         /* Initialize crypto session. */
  201         bzero(cria, sizeof (*cria));
  202         cria->cri_alg = sav->tdb_authalgxform->type;
  203         cria->cri_klen = _KEYBITS(sav->key_auth);
  204         cria->cri_key = sav->key_auth->key_data;
  205         cria->cri_mlen = AUTHSIZE(sav);
  206 
  207         return 0;
  208 }
  209 
  210 /*
  211  * ah_init() is called when an SPI is being set up.
  212  */
  213 static int
  214 ah_init(struct secasvar *sav, struct xformsw *xsp)
  215 {
  216         struct cryptoini cria;
  217         int error;
  218 
  219         error = ah_init0(sav, xsp, &cria);
  220         return error ? error :
  221                  crypto_newsession(&sav->tdb_cryptoid, &cria, crypto_support);
  222 }
  223 
  224 /*
  225  * Paranoia.
  226  *
  227  * NB: public for use by esp_zeroize (XXX).
  228  */
  229 int
  230 ah_zeroize(struct secasvar *sav)
  231 {
  232         int err;
  233 
  234         if (sav->key_auth)
  235                 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth));
  236 
  237         err = crypto_freesession(sav->tdb_cryptoid);
  238         sav->tdb_cryptoid = 0;
  239         sav->tdb_authalgxform = NULL;
  240         sav->tdb_xform = NULL;
  241         return err;
  242 }
  243 
  244 /*
  245  * Massage IPv4/IPv6 headers for AH processing.
  246  */
  247 static int
  248 ah_massage_headers(struct mbuf **m0, int proto, int skip, int alg, int out)
  249 {
  250         struct mbuf *m = *m0;
  251         unsigned char *ptr;
  252         int off, count;
  253 
  254 #ifdef INET
  255         struct ip *ip;
  256 #endif /* INET */
  257 
  258 #ifdef INET6
  259         struct ip6_ext *ip6e;
  260         struct ip6_hdr ip6;
  261         int alloc, len, ad;
  262 #endif /* INET6 */
  263 
  264         switch (proto) {
  265 #ifdef INET
  266         case AF_INET:
  267                 /*
  268                  * This is the least painful way of dealing with IPv4 header
  269                  * and option processing -- just make sure they're in
  270                  * contiguous memory.
  271                  */
  272                 *m0 = m = m_pullup(m, skip);
  273                 if (m == NULL) {
  274                         DPRINTF(("%s: m_pullup failed\n", __func__));
  275                         return ENOBUFS;
  276                 }
  277 
  278                 /* Fix the IP header */
  279                 ip = mtod(m, struct ip *);
  280                 if (ah_cleartos)
  281                         ip->ip_tos = 0;
  282                 ip->ip_ttl = 0;
  283                 ip->ip_sum = 0;
  284 
  285                 /*
  286                  * On input, fix ip_len which has been byte-swapped
  287                  * at ip_input().
  288                  */
  289                 if (!out) {
  290                         ip->ip_len = htons(ip->ip_len + skip);
  291 
  292                         if (alg == CRYPTO_MD5_KPDK || alg == CRYPTO_SHA1_KPDK)
  293                                 ip->ip_off = htons(ip->ip_off & IP_DF);
  294                         else
  295                                 ip->ip_off = 0;
  296                 } else {
  297                         if (alg == CRYPTO_MD5_KPDK || alg == CRYPTO_SHA1_KPDK)
  298                                 ip->ip_off = htons(ntohs(ip->ip_off) & IP_DF);
  299                         else
  300                                 ip->ip_off = 0;
  301                 }
  302 
  303                 ptr = mtod(m, unsigned char *) + sizeof(struct ip);
  304 
  305                 /* IPv4 option processing */
  306                 for (off = sizeof(struct ip); off < skip;) {
  307                         if (ptr[off] == IPOPT_EOL || ptr[off] == IPOPT_NOP ||
  308                             off + 1 < skip)
  309                                 ;
  310                         else {
  311                                 DPRINTF(("%s: illegal IPv4 option length for "
  312                                         "option %d\n", __func__, ptr[off]));
  313 
  314                                 m_freem(m);
  315                                 return EINVAL;
  316                         }
  317 
  318                         switch (ptr[off]) {
  319                         case IPOPT_EOL:
  320                                 off = skip;  /* End the loop. */
  321                                 break;
  322 
  323                         case IPOPT_NOP:
  324                                 off++;
  325                                 break;
  326 
  327                         case IPOPT_SECURITY:    /* 0x82 */
  328                         case 0x85:      /* Extended security. */
  329                         case 0x86:      /* Commercial security. */
  330                         case 0x94:      /* Router alert */
  331                         case 0x95:      /* RFC1770 */
  332                                 /* Sanity check for option length. */
  333                                 if (ptr[off + 1] < 2) {
  334                                         DPRINTF(("%s: illegal IPv4 option "
  335                                                 "length for option %d\n",
  336                                                 __func__, ptr[off]));
  337 
  338                                         m_freem(m);
  339                                         return EINVAL;
  340                                 }
  341 
  342                                 off += ptr[off + 1];
  343                                 break;
  344 
  345                         case IPOPT_LSRR:
  346                         case IPOPT_SSRR:
  347                                 /* Sanity check for option length. */
  348                                 if (ptr[off + 1] < 2) {
  349                                         DPRINTF(("%s: illegal IPv4 option "
  350                                                 "length for option %d\n",
  351                                                 __func__, ptr[off]));
  352 
  353                                         m_freem(m);
  354                                         return EINVAL;
  355                                 }
  356 
  357                                 /*
  358                                  * On output, if we have either of the
  359                                  * source routing options, we should
  360                                  * swap the destination address of the
  361                                  * IP header with the last address
  362                                  * specified in the option, as that is
  363                                  * what the destination's IP header
  364                                  * will look like.
  365                                  */
  366                                 if (out)
  367                                         bcopy(ptr + off + ptr[off + 1] -
  368                                             sizeof(struct in_addr),
  369                                             &(ip->ip_dst), sizeof(struct in_addr));
  370 
  371                                 /* Fall through */
  372                         default:
  373                                 /* Sanity check for option length. */
  374                                 if (ptr[off + 1] < 2) {
  375                                         DPRINTF(("%s: illegal IPv4 option "
  376                                                 "length for option %d\n",
  377                                                 __func__, ptr[off]));
  378                                         m_freem(m);
  379                                         return EINVAL;
  380                                 }
  381 
  382                                 /* Zeroize all other options. */
  383                                 count = ptr[off + 1];
  384                                 bcopy(ipseczeroes, ptr, count);
  385                                 off += count;
  386                                 break;
  387                         }
  388 
  389                         /* Sanity check. */
  390                         if (off > skip) {
  391                                 DPRINTF(("%s: malformed IPv4 options header\n",
  392                                         __func__));
  393 
  394                                 m_freem(m);
  395                                 return EINVAL;
  396                         }
  397                 }
  398 
  399                 break;
  400 #endif /* INET */
  401 
  402 #ifdef INET6
  403         case AF_INET6:  /* Ugly... */
  404                 /* Copy and "cook" the IPv6 header. */
  405                 m_copydata(m, 0, sizeof(ip6), (caddr_t) &ip6);
  406 
  407                 /* We don't do IPv6 Jumbograms. */
  408                 if (ip6.ip6_plen == 0) {
  409                         DPRINTF(("%s: unsupported IPv6 jumbogram\n", __func__));
  410                         m_freem(m);
  411                         return EMSGSIZE;
  412                 }
  413 
  414                 ip6.ip6_flow = 0;
  415                 ip6.ip6_hlim = 0;
  416                 ip6.ip6_vfc &= ~IPV6_VERSION_MASK;
  417                 ip6.ip6_vfc |= IPV6_VERSION;
  418 
  419                 /* Scoped address handling. */
  420                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_src))
  421                         ip6.ip6_src.s6_addr16[1] = 0;
  422                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_dst))
  423                         ip6.ip6_dst.s6_addr16[1] = 0;
  424 
  425                 /* Done with IPv6 header. */
  426                 m_copyback(m, 0, sizeof(struct ip6_hdr), (caddr_t) &ip6);
  427 
  428                 /* Let's deal with the remaining headers (if any). */
  429                 if (skip - sizeof(struct ip6_hdr) > 0) {
  430                         if (m->m_len <= skip) {
  431                                 ptr = (unsigned char *) malloc(
  432                                     skip - sizeof(struct ip6_hdr),
  433                                     M_XDATA, M_NOWAIT);
  434                                 if (ptr == NULL) {
  435                                         DPRINTF(("%s: failed to allocate memory"
  436                                                 "for IPv6 headers\n",__func__));
  437                                         m_freem(m);
  438                                         return ENOBUFS;
  439                                 }
  440 
  441                                 /*
  442                                  * Copy all the protocol headers after
  443                                  * the IPv6 header.
  444                                  */
  445                                 m_copydata(m, sizeof(struct ip6_hdr),
  446                                     skip - sizeof(struct ip6_hdr), ptr);
  447                                 alloc = 1;
  448                         } else {
  449                                 /* No need to allocate memory. */
  450                                 ptr = mtod(m, unsigned char *) +
  451                                     sizeof(struct ip6_hdr);
  452                                 alloc = 0;
  453                         }
  454                 } else
  455                         break;
  456 
  457                 off = ip6.ip6_nxt & 0xff; /* Next header type. */
  458 
  459                 for (len = 0; len < skip - sizeof(struct ip6_hdr);)
  460                         switch (off) {
  461                         case IPPROTO_HOPOPTS:
  462                         case IPPROTO_DSTOPTS:
  463                                 ip6e = (struct ip6_ext *) (ptr + len);
  464 
  465                                 /*
  466                                  * Process the mutable/immutable
  467                                  * options -- borrows heavily from the
  468                                  * KAME code.
  469                                  */
  470                                 for (count = len + sizeof(struct ip6_ext);
  471                                      count < len + ((ip6e->ip6e_len + 1) << 3);) {
  472                                         if (ptr[count] == IP6OPT_PAD1) {
  473                                                 count++;
  474                                                 continue; /* Skip padding. */
  475                                         }
  476 
  477                                         /* Sanity check. */
  478                                         if (count > len +
  479                                             ((ip6e->ip6e_len + 1) << 3)) {
  480                                                 m_freem(m);
  481 
  482                                                 /* Free, if we allocated. */
  483                                                 if (alloc)
  484                                                         FREE(ptr, M_XDATA);
  485                                                 return EINVAL;
  486                                         }
  487 
  488                                         ad = ptr[count + 1];
  489 
  490                                         /* If mutable option, zeroize. */
  491                                         if (ptr[count] & IP6OPT_MUTABLE)
  492                                                 bcopy(ipseczeroes, ptr + count,
  493                                                     ptr[count + 1]);
  494 
  495                                         count += ad;
  496 
  497                                         /* Sanity check. */
  498                                         if (count >
  499                                             skip - sizeof(struct ip6_hdr)) {
  500                                                 m_freem(m);
  501 
  502                                                 /* Free, if we allocated. */
  503                                                 if (alloc)
  504                                                         FREE(ptr, M_XDATA);
  505                                                 return EINVAL;
  506                                         }
  507                                 }
  508 
  509                                 /* Advance. */
  510                                 len += ((ip6e->ip6e_len + 1) << 3);
  511                                 off = ip6e->ip6e_nxt;
  512                                 break;
  513 
  514                         case IPPROTO_ROUTING:
  515                                 /*
  516                                  * Always include routing headers in
  517                                  * computation.
  518                                  */
  519                                 ip6e = (struct ip6_ext *) (ptr + len);
  520                                 len += ((ip6e->ip6e_len + 1) << 3);
  521                                 off = ip6e->ip6e_nxt;
  522                                 break;
  523 
  524                         default:
  525                                 DPRINTF(("%s: unexpected IPv6 header type %d",
  526                                         __func__, off));
  527                                 if (alloc)
  528                                         FREE(ptr, M_XDATA);
  529                                 m_freem(m);
  530                                 return EINVAL;
  531                         }
  532 
  533                 /* Copyback and free, if we allocated. */
  534                 if (alloc) {
  535                         m_copyback(m, sizeof(struct ip6_hdr),
  536                             skip - sizeof(struct ip6_hdr), ptr);
  537                         free(ptr, M_XDATA);
  538                 }
  539 
  540                 break;
  541 #endif /* INET6 */
  542         }
  543 
  544         return 0;
  545 }
  546 
  547 /*
  548  * ah_input() gets called to verify that an input packet
  549  * passes authentication.
  550  */
  551 static int
  552 ah_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  553 {
  554         struct auth_hash *ahx;
  555         struct tdb_ident *tdbi;
  556         struct tdb_crypto *tc;
  557         struct m_tag *mtag;
  558         struct newah *ah;
  559         int hl, rplen, authsize;
  560 
  561         struct cryptodesc *crda;
  562         struct cryptop *crp;
  563 
  564         IPSEC_SPLASSERT_SOFTNET(__func__);
  565 
  566         IPSEC_ASSERT(sav != NULL, ("null SA"));
  567         IPSEC_ASSERT(sav->key_auth != NULL, ("null authentication key"));
  568         IPSEC_ASSERT(sav->tdb_authalgxform != NULL,
  569                 ("null authentication xform"));
  570 
  571         /* Figure out header size. */
  572         rplen = HDRSIZE(sav);
  573 
  574         /* XXX don't pullup, just copy header */
  575         IP6_EXTHDR_GET(ah, struct newah *, m, skip, rplen);
  576         if (ah == NULL) {
  577                 DPRINTF(("ah_input: cannot pullup header\n"));
  578                 ahstat.ahs_hdrops++;            /*XXX*/
  579                 m_freem(m);
  580                 return ENOBUFS;
  581         }
  582 
  583         /* Check replay window, if applicable. */
  584         if (sav->replay && !ipsec_chkreplay(ntohl(ah->ah_seq), sav)) {
  585                 ahstat.ahs_replay++;
  586                 DPRINTF(("%s: packet replay failure: %s\n", __func__,
  587                           ipsec_logsastr(sav)));
  588                 m_freem(m);
  589                 return ENOBUFS;
  590         }
  591 
  592         /* Verify AH header length. */
  593         hl = ah->ah_len * sizeof (u_int32_t);
  594         ahx = sav->tdb_authalgxform;
  595         authsize = AUTHSIZE(sav);
  596         if (hl != authsize + rplen - sizeof (struct ah)) {
  597                 DPRINTF(("%s: bad authenticator length %u (expecting %lu)"
  598                         " for packet in SA %s/%08lx\n", __func__,
  599                         hl, (u_long) (authsize + rplen - sizeof (struct ah)),
  600                         ipsec_address(&sav->sah->saidx.dst),
  601                         (u_long) ntohl(sav->spi)));
  602                 ahstat.ahs_badauthl++;
  603                 m_freem(m);
  604                 return EACCES;
  605         }
  606         ahstat.ahs_ibytes += m->m_pkthdr.len - skip - hl;
  607 
  608         /* Get crypto descriptors. */
  609         crp = crypto_getreq(1);
  610         if (crp == NULL) {
  611                 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
  612                 ahstat.ahs_crypto++;
  613                 m_freem(m);
  614                 return ENOBUFS;
  615         }
  616 
  617         crda = crp->crp_desc;
  618         IPSEC_ASSERT(crda != NULL, ("null crypto descriptor"));
  619 
  620         crda->crd_skip = 0;
  621         crda->crd_len = m->m_pkthdr.len;
  622         crda->crd_inject = skip + rplen;
  623 
  624         /* Authentication operation. */
  625         crda->crd_alg = ahx->type;
  626         crda->crd_klen = _KEYBITS(sav->key_auth);
  627         crda->crd_key = sav->key_auth->key_data;
  628 
  629         /* Find out if we've already done crypto. */
  630         for (mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, NULL);
  631              mtag != NULL;
  632              mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, mtag)) {
  633                 tdbi = (struct tdb_ident *) (mtag + 1);
  634                 if (tdbi->proto == sav->sah->saidx.proto &&
  635                     tdbi->spi == sav->spi &&
  636                     !bcmp(&tdbi->dst, &sav->sah->saidx.dst,
  637                           sizeof (union sockaddr_union)))
  638                         break;
  639         }
  640 
  641         /* Allocate IPsec-specific opaque crypto info. */
  642         if (mtag == NULL) {
  643                 tc = (struct tdb_crypto *) malloc(sizeof (struct tdb_crypto) +
  644                         skip + rplen + authsize, M_XDATA, M_NOWAIT|M_ZERO);
  645         } else {
  646                 /* Hash verification has already been done successfully. */
  647                 tc = (struct tdb_crypto *) malloc(sizeof (struct tdb_crypto),
  648                                                     M_XDATA, M_NOWAIT|M_ZERO);
  649         }
  650         if (tc == NULL) {
  651                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
  652                 ahstat.ahs_crypto++;
  653                 crypto_freereq(crp);
  654                 m_freem(m);
  655                 return ENOBUFS;
  656         }
  657 
  658         /* Only save information if crypto processing is needed. */
  659         if (mtag == NULL) {
  660                 int error;
  661 
  662                 /*
  663                  * Save the authenticator, the skipped portion of the packet,
  664                  * and the AH header.
  665                  */
  666                 m_copydata(m, 0, skip + rplen + authsize, (caddr_t)(tc+1));
  667 
  668                 /* Zeroize the authenticator on the packet. */
  669                 m_copyback(m, skip + rplen, authsize, ipseczeroes);
  670 
  671                 /* "Massage" the packet headers for crypto processing. */
  672                 error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
  673                     skip, ahx->type, 0);
  674                 if (error != 0) {
  675                         /* NB: mbuf is free'd by ah_massage_headers */
  676                         ahstat.ahs_hdrops++;
  677                         free(tc, M_XDATA);
  678                         crypto_freereq(crp);
  679                         return error;
  680                 }
  681         }
  682 
  683         /* Crypto operation descriptor. */
  684         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
  685         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
  686         crp->crp_buf = (caddr_t) m;
  687         crp->crp_callback = ah_input_cb;
  688         crp->crp_sid = sav->tdb_cryptoid;
  689         crp->crp_opaque = (caddr_t) tc;
  690 
  691         /* These are passed as-is to the callback. */
  692         tc->tc_spi = sav->spi;
  693         tc->tc_dst = sav->sah->saidx.dst;
  694         tc->tc_proto = sav->sah->saidx.proto;
  695         tc->tc_nxt = ah->ah_nxt;
  696         tc->tc_protoff = protoff;
  697         tc->tc_skip = skip;
  698         tc->tc_ptr = (caddr_t) mtag; /* Save the mtag we've identified. */
  699 
  700         if (mtag == NULL)
  701                 return crypto_dispatch(crp);
  702         else
  703                 return ah_input_cb(crp);
  704 }
  705 
  706 #ifdef INET6
  707 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do {              \
  708         if (saidx->dst.sa.sa_family == AF_INET6) {                           \
  709                 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
  710         } else {                                                             \
  711                 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
  712         }                                                                    \
  713 } while (0)
  714 #else
  715 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag)                   \
  716         (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
  717 #endif
  718 
  719 /*
  720  * AH input callback from the crypto driver.
  721  */
  722 static int
  723 ah_input_cb(struct cryptop *crp)
  724 {
  725         int rplen, error, skip, protoff;
  726         unsigned char calc[AH_ALEN_MAX];
  727         struct mbuf *m;
  728         struct cryptodesc *crd;
  729         struct auth_hash *ahx;
  730         struct tdb_crypto *tc;
  731         struct m_tag *mtag;
  732         struct secasvar *sav;
  733         struct secasindex *saidx;
  734         u_int8_t nxt;
  735         caddr_t ptr;
  736         int authsize;
  737 
  738         crd = crp->crp_desc;
  739 
  740         tc = (struct tdb_crypto *) crp->crp_opaque;
  741         IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!"));
  742         skip = tc->tc_skip;
  743         nxt = tc->tc_nxt;
  744         protoff = tc->tc_protoff;
  745         mtag = (struct m_tag *) tc->tc_ptr;
  746         m = (struct mbuf *) crp->crp_buf;
  747 
  748         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
  749         if (sav == NULL) {
  750                 ahstat.ahs_notdb++;
  751                 DPRINTF(("%s: SA expired while in crypto\n", __func__));
  752                 error = ENOBUFS;                /*XXX*/
  753                 goto bad;
  754         }
  755 
  756         saidx = &sav->sah->saidx;
  757         IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
  758                 saidx->dst.sa.sa_family == AF_INET6,
  759                 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
  760 
  761         ahx = (struct auth_hash *) sav->tdb_authalgxform;
  762 
  763         /* Check for crypto errors. */
  764         if (crp->crp_etype) {
  765                 if (sav->tdb_cryptoid != 0)
  766                         sav->tdb_cryptoid = crp->crp_sid;
  767 
  768                 if (crp->crp_etype == EAGAIN) {
  769                         error = crypto_dispatch(crp);
  770                         return error;
  771                 }
  772 
  773                 ahstat.ahs_noxform++;
  774                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  775                 error = crp->crp_etype;
  776                 goto bad;
  777         } else {
  778                 ahstat.ahs_hist[sav->alg_auth]++;
  779                 crypto_freereq(crp);            /* No longer needed. */
  780                 crp = NULL;
  781         }
  782 
  783         /* Shouldn't happen... */
  784         if (m == NULL) {
  785                 ahstat.ahs_crypto++;
  786                 DPRINTF(("%s: bogus returned buffer from crypto\n", __func__));
  787                 error = EINVAL;
  788                 goto bad;
  789         }
  790 
  791         /* Figure out header size. */
  792         rplen = HDRSIZE(sav);
  793         authsize = AUTHSIZE(sav);
  794 
  795         /* Copy authenticator off the packet. */
  796         m_copydata(m, skip + rplen, authsize, calc);
  797 
  798         /*
  799          * If we have an mtag, we don't need to verify the authenticator --
  800          * it has been verified by an IPsec-aware NIC.
  801          */
  802         if (mtag == NULL) {
  803                 ptr = (caddr_t) (tc + 1);
  804 
  805                 /* Verify authenticator. */
  806                 if (bcmp(ptr + skip + rplen, calc, authsize)) {
  807                         DPRINTF(("%s: authentication hash mismatch for packet "
  808                             "in SA %s/%08lx\n", __func__,
  809                             ipsec_address(&saidx->dst),
  810                             (u_long) ntohl(sav->spi)));
  811                         ahstat.ahs_badauth++;
  812                         error = EACCES;
  813                         goto bad;
  814                 }
  815 
  816                 /* Fix the Next Protocol field. */
  817                 ((u_int8_t *) ptr)[protoff] = nxt;
  818 
  819                 /* Copyback the saved (uncooked) network headers. */
  820                 m_copyback(m, 0, skip, ptr);
  821         } else {
  822                 /* Fix the Next Protocol field. */
  823                 m_copyback(m, protoff, sizeof(u_int8_t), &nxt);
  824         }
  825 
  826         free(tc, M_XDATA), tc = NULL;                   /* No longer needed */
  827 
  828         /*
  829          * Header is now authenticated.
  830          */
  831         m->m_flags |= M_AUTHIPHDR|M_AUTHIPDGM;
  832 
  833         /*
  834          * Update replay sequence number, if appropriate.
  835          */
  836         if (sav->replay) {
  837                 u_int32_t seq;
  838 
  839                 m_copydata(m, skip + offsetof(struct newah, ah_seq),
  840                            sizeof (seq), (caddr_t) &seq);
  841                 if (ipsec_updatereplay(ntohl(seq), sav)) {
  842                         ahstat.ahs_replay++;
  843                         error = ENOBUFS;                        /*XXX as above*/
  844                         goto bad;
  845                 }
  846         }
  847 
  848         /*
  849          * Remove the AH header and authenticator from the mbuf.
  850          */
  851         error = m_striphdr(m, skip, rplen + authsize);
  852         if (error) {
  853                 DPRINTF(("%s: mangled mbuf chain for SA %s/%08lx\n", __func__,
  854                     ipsec_address(&saidx->dst), (u_long) ntohl(sav->spi)));
  855 
  856                 ahstat.ahs_hdrops++;
  857                 goto bad;
  858         }
  859 
  860         IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag);
  861 
  862         KEY_FREESAV(&sav);
  863         return error;
  864 bad:
  865         if (sav)
  866                 KEY_FREESAV(&sav);
  867         if (m != NULL)
  868                 m_freem(m);
  869         if (tc != NULL)
  870                 free(tc, M_XDATA);
  871         if (crp != NULL)
  872                 crypto_freereq(crp);
  873         return error;
  874 }
  875 
  876 /*
  877  * AH output routine, called by ipsec[46]_process_packet().
  878  */
  879 static int
  880 ah_output(
  881         struct mbuf *m,
  882         struct ipsecrequest *isr,
  883         struct mbuf **mp,
  884         int skip,
  885         int protoff)
  886 {
  887         struct secasvar *sav;
  888         struct auth_hash *ahx;
  889         struct cryptodesc *crda;
  890         struct tdb_crypto *tc;
  891         struct mbuf *mi;
  892         struct cryptop *crp;
  893         u_int16_t iplen;
  894         int error, rplen, authsize, maxpacketsize, roff;
  895         u_int8_t prot;
  896         struct newah *ah;
  897 
  898         IPSEC_SPLASSERT_SOFTNET(__func__);
  899 
  900         sav = isr->sav;
  901         IPSEC_ASSERT(sav != NULL, ("null SA"));
  902         ahx = sav->tdb_authalgxform;
  903         IPSEC_ASSERT(ahx != NULL, ("null authentication xform"));
  904 
  905         ahstat.ahs_output++;
  906 
  907         /* Figure out header size. */
  908         rplen = HDRSIZE(sav);
  909 
  910         /* Check for maximum packet size violations. */
  911         switch (sav->sah->saidx.dst.sa.sa_family) {
  912 #ifdef INET
  913         case AF_INET:
  914                 maxpacketsize = IP_MAXPACKET;
  915                 break;
  916 #endif /* INET */
  917 #ifdef INET6
  918         case AF_INET6:
  919                 maxpacketsize = IPV6_MAXPACKET;
  920                 break;
  921 #endif /* INET6 */
  922         default:
  923                 DPRINTF(("%s: unknown/unsupported protocol family %u, "
  924                     "SA %s/%08lx\n", __func__,
  925                     sav->sah->saidx.dst.sa.sa_family,
  926                     ipsec_address(&sav->sah->saidx.dst),
  927                     (u_long) ntohl(sav->spi)));
  928                 ahstat.ahs_nopf++;
  929                 error = EPFNOSUPPORT;
  930                 goto bad;
  931         }
  932         authsize = AUTHSIZE(sav);
  933         if (rplen + authsize + m->m_pkthdr.len > maxpacketsize) {
  934                 DPRINTF(("%s: packet in SA %s/%08lx got too big "
  935                     "(len %u, max len %u)\n", __func__,
  936                     ipsec_address(&sav->sah->saidx.dst),
  937                     (u_long) ntohl(sav->spi),
  938                     rplen + authsize + m->m_pkthdr.len, maxpacketsize));
  939                 ahstat.ahs_toobig++;
  940                 error = EMSGSIZE;
  941                 goto bad;
  942         }
  943 
  944         /* Update the counters. */
  945         ahstat.ahs_obytes += m->m_pkthdr.len - skip;
  946 
  947         m = m_unshare(m, M_NOWAIT);
  948         if (m == NULL) {
  949                 DPRINTF(("%s: cannot clone mbuf chain, SA %s/%08lx\n", __func__,
  950                     ipsec_address(&sav->sah->saidx.dst),
  951                     (u_long) ntohl(sav->spi)));
  952                 ahstat.ahs_hdrops++;
  953                 error = ENOBUFS;
  954                 goto bad;
  955         }
  956 
  957         /* Inject AH header. */
  958         mi = m_makespace(m, skip, rplen + authsize, &roff);
  959         if (mi == NULL) {
  960                 DPRINTF(("%s: failed to inject %u byte AH header for SA "
  961                     "%s/%08lx\n", __func__,
  962                     rplen + authsize,
  963                     ipsec_address(&sav->sah->saidx.dst),
  964                     (u_long) ntohl(sav->spi)));
  965                 ahstat.ahs_hdrops++;            /*XXX differs from openbsd */
  966                 error = ENOBUFS;
  967                 goto bad;
  968         }
  969 
  970         /*
  971          * The AH header is guaranteed by m_makespace() to be in
  972          * contiguous memory, at roff bytes offset into the returned mbuf.
  973          */
  974         ah = (struct newah *)(mtod(mi, caddr_t) + roff);
  975 
  976         /* Initialize the AH header. */
  977         m_copydata(m, protoff, sizeof(u_int8_t), (caddr_t) &ah->ah_nxt);
  978         ah->ah_len = (rplen + authsize - sizeof(struct ah)) / sizeof(u_int32_t);
  979         ah->ah_reserve = 0;
  980         ah->ah_spi = sav->spi;
  981 
  982         /* Zeroize authenticator. */
  983         m_copyback(m, skip + rplen, authsize, ipseczeroes);
  984 
  985         /* Insert packet replay counter, as requested.  */
  986         if (sav->replay) {
  987                 if (sav->replay->count == ~0 &&
  988                     (sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
  989                         DPRINTF(("%s: replay counter wrapped for SA %s/%08lx\n",
  990                                 __func__,
  991                                 ipsec_address(&sav->sah->saidx.dst),
  992                                 (u_long) ntohl(sav->spi)));
  993                         ahstat.ahs_wrap++;
  994                         error = EINVAL;
  995                         goto bad;
  996                 }
  997 #ifdef REGRESSION
  998                 /* Emulate replay attack when ipsec_replay is TRUE. */
  999                 if (!ipsec_replay)
 1000 #endif
 1001                         sav->replay->count++;
 1002                 ah->ah_seq = htonl(sav->replay->count);
 1003         }
 1004 
 1005         /* Get crypto descriptors. */
 1006         crp = crypto_getreq(1);
 1007         if (crp == NULL) {
 1008                 DPRINTF(("%s: failed to acquire crypto descriptors\n",
 1009                         __func__));
 1010                 ahstat.ahs_crypto++;
 1011                 error = ENOBUFS;
 1012                 goto bad;
 1013         }
 1014 
 1015         crda = crp->crp_desc;
 1016 
 1017         crda->crd_skip = 0;
 1018         crda->crd_inject = skip + rplen;
 1019         crda->crd_len = m->m_pkthdr.len;
 1020 
 1021         /* Authentication operation. */
 1022         crda->crd_alg = ahx->type;
 1023         crda->crd_key = sav->key_auth->key_data;
 1024         crda->crd_klen = _KEYBITS(sav->key_auth);
 1025 
 1026         /* Allocate IPsec-specific opaque crypto info. */
 1027         tc = (struct tdb_crypto *) malloc(
 1028                 sizeof(struct tdb_crypto) + skip, M_XDATA, M_NOWAIT|M_ZERO);
 1029         if (tc == NULL) {
 1030                 crypto_freereq(crp);
 1031                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
 1032                 ahstat.ahs_crypto++;
 1033                 error = ENOBUFS;
 1034                 goto bad;
 1035         }
 1036 
 1037         /* Save the skipped portion of the packet. */
 1038         m_copydata(m, 0, skip, (caddr_t) (tc + 1));
 1039 
 1040         /*
 1041          * Fix IP header length on the header used for
 1042          * authentication. We don't need to fix the original
 1043          * header length as it will be fixed by our caller.
 1044          */
 1045         switch (sav->sah->saidx.dst.sa.sa_family) {
 1046 #ifdef INET
 1047         case AF_INET:
 1048                 bcopy(((caddr_t)(tc + 1)) +
 1049                     offsetof(struct ip, ip_len),
 1050                     (caddr_t) &iplen, sizeof(u_int16_t));
 1051                 iplen = htons(ntohs(iplen) + rplen + authsize);
 1052                 m_copyback(m, offsetof(struct ip, ip_len),
 1053                     sizeof(u_int16_t), (caddr_t) &iplen);
 1054                 break;
 1055 #endif /* INET */
 1056 
 1057 #ifdef INET6
 1058         case AF_INET6:
 1059                 bcopy(((caddr_t)(tc + 1)) +
 1060                     offsetof(struct ip6_hdr, ip6_plen),
 1061                     (caddr_t) &iplen, sizeof(u_int16_t));
 1062                 iplen = htons(ntohs(iplen) + rplen + authsize);
 1063                 m_copyback(m, offsetof(struct ip6_hdr, ip6_plen),
 1064                     sizeof(u_int16_t), (caddr_t) &iplen);
 1065                 break;
 1066 #endif /* INET6 */
 1067         }
 1068 
 1069         /* Fix the Next Header field in saved header. */
 1070         ((u_int8_t *) (tc + 1))[protoff] = IPPROTO_AH;
 1071 
 1072         /* Update the Next Protocol field in the IP header. */
 1073         prot = IPPROTO_AH;
 1074         m_copyback(m, protoff, sizeof(u_int8_t), (caddr_t) &prot);
 1075 
 1076         /* "Massage" the packet headers for crypto processing. */
 1077         error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
 1078                         skip, ahx->type, 1);
 1079         if (error != 0) {
 1080                 m = NULL;       /* mbuf was free'd by ah_massage_headers. */
 1081                 free(tc, M_XDATA);
 1082                 crypto_freereq(crp);
 1083                 goto bad;
 1084         }
 1085 
 1086         /* Crypto operation descriptor. */
 1087         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
 1088         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
 1089         crp->crp_buf = (caddr_t) m;
 1090         crp->crp_callback = ah_output_cb;
 1091         crp->crp_sid = sav->tdb_cryptoid;
 1092         crp->crp_opaque = (caddr_t) tc;
 1093 
 1094         /* These are passed as-is to the callback. */
 1095         tc->tc_isr = isr;
 1096         tc->tc_spi = sav->spi;
 1097         tc->tc_dst = sav->sah->saidx.dst;
 1098         tc->tc_proto = sav->sah->saidx.proto;
 1099         tc->tc_skip = skip;
 1100         tc->tc_protoff = protoff;
 1101 
 1102         return crypto_dispatch(crp);
 1103 bad:
 1104         if (m)
 1105                 m_freem(m);
 1106         return (error);
 1107 }
 1108 
 1109 /*
 1110  * AH output callback from the crypto driver.
 1111  */
 1112 static int
 1113 ah_output_cb(struct cryptop *crp)
 1114 {
 1115         int skip, protoff, error;
 1116         struct tdb_crypto *tc;
 1117         struct ipsecrequest *isr;
 1118         struct secasvar *sav;
 1119         struct mbuf *m;
 1120         caddr_t ptr;
 1121         int err;
 1122 
 1123         tc = (struct tdb_crypto *) crp->crp_opaque;
 1124         IPSEC_ASSERT(tc != NULL, ("null opaque data area!"));
 1125         skip = tc->tc_skip;
 1126         protoff = tc->tc_protoff;
 1127         ptr = (caddr_t) (tc + 1);
 1128         m = (struct mbuf *) crp->crp_buf;
 1129 
 1130         isr = tc->tc_isr;
 1131         IPSECREQUEST_LOCK(isr);
 1132         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
 1133         if (sav == NULL) {
 1134                 ahstat.ahs_notdb++;
 1135                 DPRINTF(("%s: SA expired while in crypto\n", __func__));
 1136                 error = ENOBUFS;                /*XXX*/
 1137                 goto bad;
 1138         }
 1139         IPSEC_ASSERT(isr->sav == sav, ("SA changed\n"));
 1140 
 1141         /* Check for crypto errors. */
 1142         if (crp->crp_etype) {
 1143                 if (sav->tdb_cryptoid != 0)
 1144                         sav->tdb_cryptoid = crp->crp_sid;
 1145 
 1146                 if (crp->crp_etype == EAGAIN) {
 1147                         KEY_FREESAV(&sav);
 1148                         IPSECREQUEST_UNLOCK(isr);
 1149                         error = crypto_dispatch(crp);
 1150                         return error;
 1151                 }
 1152 
 1153                 ahstat.ahs_noxform++;
 1154                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
 1155                 error = crp->crp_etype;
 1156                 goto bad;
 1157         }
 1158 
 1159         /* Shouldn't happen... */
 1160         if (m == NULL) {
 1161                 ahstat.ahs_crypto++;
 1162                 DPRINTF(("%s: bogus returned buffer from crypto\n", __func__));
 1163                 error = EINVAL;
 1164                 goto bad;
 1165         }
 1166         ahstat.ahs_hist[sav->alg_auth]++;
 1167 
 1168         /*
 1169          * Copy original headers (with the new protocol number) back
 1170          * in place.
 1171          */
 1172         m_copyback(m, 0, skip, ptr);
 1173 
 1174         /* No longer needed. */
 1175         free(tc, M_XDATA);
 1176         crypto_freereq(crp);
 1177 
 1178 #ifdef REGRESSION
 1179         /* Emulate man-in-the-middle attack when ipsec_integrity is TRUE. */
 1180         if (ipsec_integrity) {
 1181                 int alen;
 1182 
 1183                 /*
 1184                  * Corrupt HMAC if we want to test integrity verification of
 1185                  * the other side.
 1186                  */
 1187                 alen = AUTHSIZE(sav);
 1188                 m_copyback(m, m->m_pkthdr.len - alen, alen, ipseczeroes);
 1189         }
 1190 #endif
 1191 
 1192         /* NB: m is reclaimed by ipsec_process_done. */
 1193         err = ipsec_process_done(m, isr);
 1194         KEY_FREESAV(&sav);
 1195         IPSECREQUEST_UNLOCK(isr);
 1196         return err;
 1197 bad:
 1198         if (sav)
 1199                 KEY_FREESAV(&sav);
 1200         IPSECREQUEST_UNLOCK(isr);
 1201         if (m)
 1202                 m_freem(m);
 1203         free(tc, M_XDATA);
 1204         crypto_freereq(crp);
 1205         return error;
 1206 }
 1207 
 1208 static struct xformsw ah_xformsw = {
 1209         XF_AH,          XFT_AUTH,       "IPsec AH",
 1210         ah_init,        ah_zeroize,     ah_input,       ah_output,
 1211 };
 1212 
 1213 static void
 1214 ah_attach(void)
 1215 {
 1216         xform_register(&ah_xformsw);
 1217 }
 1218 SYSINIT(ah_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ah_attach, NULL);

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