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: releng/5.1/sys/netipsec/xform_ah.c 111297 2003-02-23 07:25:48Z sam $  */
    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 gets
   85  * this size from the xform but is (currently) always 12.
   86  */
   87 #define AUTHSIZE(sav) \
   88         ((sav->flags & SADB_X_EXT_OLD) ? 16 : (sav)->tdb_authalgxform->authsize)
   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 >= AH_ALG_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_96;
  120         case SADB_AALG_SHA1HMAC:
  121                 return &auth_hash_hmac_sha1_96;
  122         case SADB_X_AALG_RIPEMD160HMAC:
  123                 return &auth_hash_hmac_ripemd_160_96;
  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                 KASSERT(sav->tdb_authalgxform != NULL,
  146                         ("ah_hdrsiz: null xform"));
  147                 /*XXX not right for null algorithm--does it matter??*/
  148                 authsize = AUTHSIZE(sav);
  149                 size = roundup(authsize, sizeof (u_int32_t)) + HDRSIZE(sav);
  150         } else {
  151                 /* default guess */
  152                 size = sizeof (struct ah) + sizeof (u_int32_t) + 16;
  153         }
  154         return size;
  155 }
  156 
  157 /*
  158  * NB: public for use by esp_init.
  159  */
  160 int
  161 ah_init0(struct secasvar *sav, struct xformsw *xsp, struct cryptoini *cria)
  162 {
  163         struct auth_hash *thash;
  164         int keylen;
  165 
  166         thash = ah_algorithm_lookup(sav->alg_auth);
  167         if (thash == NULL) {
  168                 DPRINTF(("ah_init: unsupported authentication algorithm %u\n",
  169                         sav->alg_auth));
  170                 return EINVAL;
  171         }
  172         /*
  173          * Verify the replay state block allocation is consistent with
  174          * the protocol type.  We check here so we can make assumptions
  175          * later during protocol processing.
  176          */
  177         /* NB: replay state is setup elsewhere (sigh) */
  178         if (((sav->flags&SADB_X_EXT_OLD) == 0) ^ (sav->replay != NULL)) {
  179                 DPRINTF(("ah_init: replay state block inconsistency, "
  180                         "%s algorithm %s replay state\n",
  181                         (sav->flags & SADB_X_EXT_OLD) ? "old" : "new",
  182                         sav->replay == NULL ? "without" : "with"));
  183                 return EINVAL;
  184         }
  185         if (sav->key_auth == NULL) {
  186                 DPRINTF(("ah_init: no authentication key for %s "
  187                         "algorithm\n", thash->name));
  188                 return EINVAL;
  189         }
  190         keylen = _KEYLEN(sav->key_auth);
  191         if (keylen != thash->keysize && thash->keysize != 0) {
  192                 DPRINTF(("ah_init: invalid keylength %d, algorithm "
  193                          "%s requires keysize %d\n",
  194                          keylen, thash->name, thash->keysize));
  195                 return EINVAL;
  196         }
  197 
  198         sav->tdb_xform = xsp;
  199         sav->tdb_authalgxform = thash;
  200 
  201         /* Initialize crypto session. */
  202         bzero(cria, sizeof (*cria));
  203         cria->cri_alg = sav->tdb_authalgxform->type;
  204         cria->cri_klen = _KEYBITS(sav->key_auth);
  205         cria->cri_key = _KEYBUF(sav->key_auth);
  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(_KEYBUF(sav->key_auth), _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(("ah_massage_headers: m_pullup failed\n"));
  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(("ah_massage_headers: illegal IPv4 "
  312                                     "option length for option %d\n",
  313                                     ptr[off]));
  314 
  315                                 m_freem(m);
  316                                 return EINVAL;
  317                         }
  318 
  319                         switch (ptr[off]) {
  320                         case IPOPT_EOL:
  321                                 off = skip;  /* End the loop. */
  322                                 break;
  323 
  324                         case IPOPT_NOP:
  325                                 off++;
  326                                 break;
  327 
  328                         case IPOPT_SECURITY:    /* 0x82 */
  329                         case 0x85:      /* Extended security. */
  330                         case 0x86:      /* Commercial security. */
  331                         case 0x94:      /* Router alert */
  332                         case 0x95:      /* RFC1770 */
  333                                 /* Sanity check for option length. */
  334                                 if (ptr[off + 1] < 2) {
  335                                         DPRINTF(("ah_massage_headers: "
  336                                             "illegal IPv4 option length for "
  337                                             "option %d\n", ptr[off]));
  338 
  339                                         m_freem(m);
  340                                         return EINVAL;
  341                                 }
  342 
  343                                 off += ptr[off + 1];
  344                                 break;
  345 
  346                         case IPOPT_LSRR:
  347                         case IPOPT_SSRR:
  348                                 /* Sanity check for option length. */
  349                                 if (ptr[off + 1] < 2) {
  350                                         DPRINTF(("ah_massage_headers: "
  351                                             "illegal IPv4 option length for "
  352                                             "option %d\n", ptr[off]));
  353 
  354                                         m_freem(m);
  355                                         return EINVAL;
  356                                 }
  357 
  358                                 /*
  359                                  * On output, if we have either of the
  360                                  * source routing options, we should
  361                                  * swap the destination address of the
  362                                  * IP header with the last address
  363                                  * specified in the option, as that is
  364                                  * what the destination's IP header
  365                                  * will look like.
  366                                  */
  367                                 if (out)
  368                                         bcopy(ptr + off + ptr[off + 1] -
  369                                             sizeof(struct in_addr),
  370                                             &(ip->ip_dst), sizeof(struct in_addr));
  371 
  372                                 /* Fall through */
  373                         default:
  374                                 /* Sanity check for option length. */
  375                                 if (ptr[off + 1] < 2) {
  376                                         DPRINTF(("ah_massage_headers: "
  377                                             "illegal IPv4 option length for "
  378                                             "option %d\n", ptr[off]));
  379                                         m_freem(m);
  380                                         return EINVAL;
  381                                 }
  382 
  383                                 /* Zeroize all other options. */
  384                                 count = ptr[off + 1];
  385                                 bcopy(ipseczeroes, ptr, count);
  386                                 off += count;
  387                                 break;
  388                         }
  389 
  390                         /* Sanity check. */
  391                         if (off > skip) {
  392                                 DPRINTF(("ah_massage_headers(): malformed "
  393                                     "IPv4 options header\n"));
  394 
  395                                 m_freem(m);
  396                                 return EINVAL;
  397                         }
  398                 }
  399 
  400                 break;
  401 #endif /* INET */
  402 
  403 #ifdef INET6
  404         case AF_INET6:  /* Ugly... */
  405                 /* Copy and "cook" the IPv6 header. */
  406                 m_copydata(m, 0, sizeof(ip6), (caddr_t) &ip6);
  407 
  408                 /* We don't do IPv6 Jumbograms. */
  409                 if (ip6.ip6_plen == 0) {
  410                         DPRINTF(("ah_massage_headers: unsupported IPv6 jumbogram\n"));
  411                         m_freem(m);
  412                         return EMSGSIZE;
  413                 }
  414 
  415                 ip6.ip6_flow = 0;
  416                 ip6.ip6_hlim = 0;
  417                 ip6.ip6_vfc &= ~IPV6_VERSION_MASK;
  418                 ip6.ip6_vfc |= IPV6_VERSION;
  419 
  420                 /* Scoped address handling. */
  421                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_src))
  422                         ip6.ip6_src.s6_addr16[1] = 0;
  423                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_dst))
  424                         ip6.ip6_dst.s6_addr16[1] = 0;
  425 
  426                 /* Done with IPv6 header. */
  427                 m_copyback(m, 0, sizeof(struct ip6_hdr), (caddr_t) &ip6);
  428 
  429                 /* Let's deal with the remaining headers (if any). */
  430                 if (skip - sizeof(struct ip6_hdr) > 0) {
  431                         if (m->m_len <= skip) {
  432                                 ptr = (unsigned char *) malloc(
  433                                     skip - sizeof(struct ip6_hdr),
  434                                     M_XDATA, M_NOWAIT);
  435                                 if (ptr == NULL) {
  436                                         DPRINTF(("ah_massage_headers: failed "
  437                                             "to allocate memory for IPv6 "
  438                                             "headers\n"));
  439                                         m_freem(m);
  440                                         return ENOBUFS;
  441                                 }
  442 
  443                                 /*
  444                                  * Copy all the protocol headers after
  445                                  * the IPv6 header.
  446                                  */
  447                                 m_copydata(m, sizeof(struct ip6_hdr),
  448                                     skip - sizeof(struct ip6_hdr), ptr);
  449                                 alloc = 1;
  450                         } else {
  451                                 /* No need to allocate memory. */
  452                                 ptr = mtod(m, unsigned char *) +
  453                                     sizeof(struct ip6_hdr);
  454                                 alloc = 0;
  455                         }
  456                 } else
  457                         break;
  458 
  459                 off = ip6.ip6_nxt & 0xff; /* Next header type. */
  460 
  461                 for (len = 0; len < skip - sizeof(struct ip6_hdr);)
  462                         switch (off) {
  463                         case IPPROTO_HOPOPTS:
  464                         case IPPROTO_DSTOPTS:
  465                                 ip6e = (struct ip6_ext *) (ptr + len);
  466 
  467                                 /*
  468                                  * Process the mutable/immutable
  469                                  * options -- borrows heavily from the
  470                                  * KAME code.
  471                                  */
  472                                 for (count = len + sizeof(struct ip6_ext);
  473                                      count < len + ((ip6e->ip6e_len + 1) << 3);) {
  474                                         if (ptr[count] == IP6OPT_PAD1) {
  475                                                 count++;
  476                                                 continue; /* Skip padding. */
  477                                         }
  478 
  479                                         /* Sanity check. */
  480                                         if (count > len +
  481                                             ((ip6e->ip6e_len + 1) << 3)) {
  482                                                 m_freem(m);
  483 
  484                                                 /* Free, if we allocated. */
  485                                                 if (alloc)
  486                                                         FREE(ptr, M_XDATA);
  487                                                 return EINVAL;
  488                                         }
  489 
  490                                         ad = ptr[count + 1];
  491 
  492                                         /* If mutable option, zeroize. */
  493                                         if (ptr[count] & IP6OPT_MUTABLE)
  494                                                 bcopy(ipseczeroes, ptr + count,
  495                                                     ptr[count + 1]);
  496 
  497                                         count += ad;
  498 
  499                                         /* Sanity check. */
  500                                         if (count >
  501                                             skip - sizeof(struct ip6_hdr)) {
  502                                                 m_freem(m);
  503 
  504                                                 /* Free, if we allocated. */
  505                                                 if (alloc)
  506                                                         FREE(ptr, M_XDATA);
  507                                                 return EINVAL;
  508                                         }
  509                                 }
  510 
  511                                 /* Advance. */
  512                                 len += ((ip6e->ip6e_len + 1) << 3);
  513                                 off = ip6e->ip6e_nxt;
  514                                 break;
  515 
  516                         case IPPROTO_ROUTING:
  517                                 /*
  518                                  * Always include routing headers in
  519                                  * computation.
  520                                  */
  521                                 ip6e = (struct ip6_ext *) (ptr + len);
  522                                 len += ((ip6e->ip6e_len + 1) << 3);
  523                                 off = ip6e->ip6e_nxt;
  524                                 break;
  525 
  526                         default:
  527                                 DPRINTF(("ah_massage_headers: unexpected "
  528                                     "IPv6 header type %d", off));
  529                                 if (alloc)
  530                                         FREE(ptr, M_XDATA);
  531                                 m_freem(m);
  532                                 return EINVAL;
  533                         }
  534 
  535                 /* Copyback and free, if we allocated. */
  536                 if (alloc) {
  537                         m_copyback(m, sizeof(struct ip6_hdr),
  538                             skip - sizeof(struct ip6_hdr), ptr);
  539                         free(ptr, M_XDATA);
  540                 }
  541 
  542                 break;
  543 #endif /* INET6 */
  544         }
  545 
  546         return 0;
  547 }
  548 
  549 /*
  550  * ah_input() gets called to verify that an input packet
  551  * passes authentication.
  552  */
  553 static int
  554 ah_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  555 {
  556         struct auth_hash *ahx;
  557         struct tdb_ident *tdbi;
  558         struct tdb_crypto *tc;
  559         struct m_tag *mtag;
  560         struct newah *ah;
  561         int hl, rplen, authsize;
  562 
  563         struct cryptodesc *crda;
  564         struct cryptop *crp;
  565 
  566 #if 0
  567         SPLASSERT(net, "ah_input");
  568 #endif
  569 
  570         KASSERT(sav != NULL, ("ah_input: null SA"));
  571         KASSERT(sav->key_auth != NULL,
  572                 ("ah_input: null authentication key"));
  573         KASSERT(sav->tdb_authalgxform != NULL,
  574                 ("ah_input: null authentication xform"));
  575 
  576         /* Figure out header size. */
  577         rplen = HDRSIZE(sav);
  578 
  579         /* XXX don't pullup, just copy header */
  580         IP6_EXTHDR_GET(ah, struct newah *, m, skip, rplen);
  581         if (ah == NULL) {
  582                 DPRINTF(("ah_input: cannot pullup header\n"));
  583                 ahstat.ahs_hdrops++;            /*XXX*/
  584                 m_freem(m);
  585                 return ENOBUFS;
  586         }
  587 
  588         /* Check replay window, if applicable. */
  589         if (sav->replay && !ipsec_chkreplay(ntohl(ah->ah_seq), sav)) {
  590                 ahstat.ahs_replay++;
  591                 DPRINTF(("ah_input: packet replay failure: %s\n",
  592                           ipsec_logsastr(sav)));
  593                 m_freem(m);
  594                 return ENOBUFS;
  595         }
  596 
  597         /* Verify AH header length. */
  598         hl = ah->ah_len * sizeof (u_int32_t);
  599         ahx = sav->tdb_authalgxform;
  600         authsize = AUTHSIZE(sav);
  601         if (hl != authsize + rplen - sizeof (struct ah)) {
  602                 DPRINTF(("ah_input: bad authenticator length %u (expecting %lu)"
  603                         " for packet in SA %s/%08lx\n",
  604                         hl, (u_long) (authsize + rplen - sizeof (struct ah)),
  605                         ipsec_address(&sav->sah->saidx.dst),
  606                         (u_long) ntohl(sav->spi)));
  607                 ahstat.ahs_badauthl++;
  608                 m_freem(m);
  609                 return EACCES;
  610         }
  611         ahstat.ahs_ibytes += m->m_pkthdr.len - skip - hl;
  612 
  613         /* Get crypto descriptors. */
  614         crp = crypto_getreq(1);
  615         if (crp == NULL) {
  616                 DPRINTF(("ah_input: failed to acquire crypto descriptor\n"));
  617                 ahstat.ahs_crypto++;
  618                 m_freem(m);
  619                 return ENOBUFS;
  620         }
  621 
  622         crda = crp->crp_desc;
  623         KASSERT(crda != NULL, ("ah_input: null crypto descriptor"));
  624 
  625         crda->crd_skip = 0;
  626         crda->crd_len = m->m_pkthdr.len;
  627         crda->crd_inject = skip + rplen;
  628 
  629         /* Authentication operation. */
  630         crda->crd_alg = ahx->type;
  631         crda->crd_key = _KEYBUF(sav->key_auth);
  632         crda->crd_klen = _KEYBITS(sav->key_auth);
  633 
  634         /* Find out if we've already done crypto. */
  635         for (mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, NULL);
  636              mtag != NULL;
  637              mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, mtag)) {
  638                 tdbi = (struct tdb_ident *) (mtag + 1);
  639                 if (tdbi->proto == sav->sah->saidx.proto &&
  640                     tdbi->spi == sav->spi &&
  641                     !bcmp(&tdbi->dst, &sav->sah->saidx.dst,
  642                           sizeof (union sockaddr_union)))
  643                         break;
  644         }
  645 
  646         /* Allocate IPsec-specific opaque crypto info. */
  647         if (mtag == NULL) {
  648                 tc = (struct tdb_crypto *) malloc(sizeof (struct tdb_crypto) +
  649                         skip + rplen + authsize, M_XDATA, M_NOWAIT|M_ZERO);
  650         } else {
  651                 /* Hash verification has already been done successfully. */
  652                 tc = (struct tdb_crypto *) malloc(sizeof (struct tdb_crypto),
  653                                                     M_XDATA, M_NOWAIT|M_ZERO);
  654         }
  655         if (tc == NULL) {
  656                 DPRINTF(("ah_input: failed to allocate tdb_crypto\n"));
  657                 ahstat.ahs_crypto++;
  658                 crypto_freereq(crp);
  659                 m_freem(m);
  660                 return ENOBUFS;
  661         }
  662 
  663         /* Only save information if crypto processing is needed. */
  664         if (mtag == NULL) {
  665                 int error;
  666 
  667                 /*
  668                  * Save the authenticator, the skipped portion of the packet,
  669                  * and the AH header.
  670                  */
  671                 m_copydata(m, 0, skip + rplen + authsize, (caddr_t)(tc+1));
  672 
  673                 /* Zeroize the authenticator on the packet. */
  674                 m_copyback(m, skip + rplen, authsize, ipseczeroes);
  675 
  676                 /* "Massage" the packet headers for crypto processing. */
  677                 error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
  678                     skip, ahx->type, 0);
  679                 if (error != 0) {
  680                         /* NB: mbuf is free'd by ah_massage_headers */
  681                         ahstat.ahs_hdrops++;
  682                         free(tc, M_XDATA);
  683                         crypto_freereq(crp);
  684                         return error;
  685                 }
  686         }
  687 
  688         /* Crypto operation descriptor. */
  689         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
  690         crp->crp_flags = CRYPTO_F_IMBUF;
  691         crp->crp_buf = (caddr_t) m;
  692         crp->crp_callback = ah_input_cb;
  693         crp->crp_sid = sav->tdb_cryptoid;
  694         crp->crp_opaque = (caddr_t) tc;
  695 
  696         /* These are passed as-is to the callback. */
  697         tc->tc_spi = sav->spi;
  698         tc->tc_dst = sav->sah->saidx.dst;
  699         tc->tc_proto = sav->sah->saidx.proto;
  700         tc->tc_nxt = ah->ah_nxt;
  701         tc->tc_protoff = protoff;
  702         tc->tc_skip = skip;
  703         tc->tc_ptr = (caddr_t) mtag; /* Save the mtag we've identified. */
  704 
  705         if (mtag == NULL)
  706                 return crypto_dispatch(crp);
  707         else
  708                 return ah_input_cb(crp);
  709 }
  710 
  711 #ifdef INET6
  712 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do {              \
  713         if (saidx->dst.sa.sa_family == AF_INET6) {                           \
  714                 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
  715         } else {                                                             \
  716                 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
  717         }                                                                    \
  718 } while (0)
  719 #else
  720 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag)                   \
  721         (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
  722 #endif
  723 
  724 /*
  725  * AH input callback from the crypto driver.
  726  */
  727 static int
  728 ah_input_cb(struct cryptop *crp)
  729 {
  730         int rplen, error, skip, protoff;
  731         unsigned char calc[AH_ALEN_MAX];
  732         struct mbuf *m;
  733         struct cryptodesc *crd;
  734         struct auth_hash *ahx;
  735         struct tdb_crypto *tc;
  736         struct m_tag *mtag;
  737         struct secasvar *sav;
  738         struct secasindex *saidx;
  739         u_int8_t nxt;
  740         caddr_t ptr;
  741         int s, authsize;
  742 
  743         crd = crp->crp_desc;
  744 
  745         tc = (struct tdb_crypto *) crp->crp_opaque;
  746         KASSERT(tc != NULL, ("ah_input_cb: null opaque crypto data area!"));
  747         skip = tc->tc_skip;
  748         nxt = tc->tc_nxt;
  749         protoff = tc->tc_protoff;
  750         mtag = (struct m_tag *) tc->tc_ptr;
  751         m = (struct mbuf *) crp->crp_buf;
  752 
  753         s = splnet();
  754 
  755         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
  756         if (sav == NULL) {
  757                 ahstat.ahs_notdb++;
  758                 DPRINTF(("ah_input_cb: SA expired while in crypto\n"));
  759                 error = ENOBUFS;                /*XXX*/
  760                 goto bad;
  761         }
  762 
  763         saidx = &sav->sah->saidx;
  764         KASSERT(saidx->dst.sa.sa_family == AF_INET ||
  765                 saidx->dst.sa.sa_family == AF_INET6,
  766                 ("ah_input_cb: unexpected protocol family %u",
  767                  saidx->dst.sa.sa_family));
  768 
  769         ahx = (struct auth_hash *) sav->tdb_authalgxform;
  770 
  771         /* Check for crypto errors. */
  772         if (crp->crp_etype) {
  773                 if (sav->tdb_cryptoid != 0)
  774                         sav->tdb_cryptoid = crp->crp_sid;
  775 
  776                 if (crp->crp_etype == EAGAIN)
  777                         return crypto_dispatch(crp);
  778 
  779                 ahstat.ahs_noxform++;
  780                 DPRINTF(("ah_input_cb: crypto error %d\n", crp->crp_etype));
  781                 error = crp->crp_etype;
  782                 goto bad;
  783         } else {
  784                 ahstat.ahs_hist[sav->alg_auth]++;
  785                 crypto_freereq(crp);            /* No longer needed. */
  786                 crp = NULL;
  787         }
  788 
  789         /* Shouldn't happen... */
  790         if (m == NULL) {
  791                 ahstat.ahs_crypto++;
  792                 DPRINTF(("ah_input_cb: bogus returned buffer from crypto\n"));
  793                 error = EINVAL;
  794                 goto bad;
  795         }
  796 
  797         /* Figure out header size. */
  798         rplen = HDRSIZE(sav);
  799         authsize = AUTHSIZE(sav);
  800 
  801         /* Copy authenticator off the packet. */
  802         m_copydata(m, skip + rplen, authsize, calc);
  803 
  804         /*
  805          * If we have an mtag, we don't need to verify the authenticator --
  806          * it has been verified by an IPsec-aware NIC.
  807          */
  808         if (mtag == NULL) {
  809                 ptr = (caddr_t) (tc + 1);
  810 
  811                 /* Verify authenticator. */
  812                 if (bcmp(ptr + skip + rplen, calc, authsize)) {
  813                         DPRINTF(("ah_input: authentication hash mismatch "
  814                             "for packet in SA %s/%08lx\n",
  815                             ipsec_address(&saidx->dst),
  816                             (u_long) ntohl(sav->spi)));
  817                         ahstat.ahs_badauth++;
  818                         error = EACCES;
  819                         goto bad;
  820                 }
  821 
  822                 /* Fix the Next Protocol field. */
  823                 ((u_int8_t *) ptr)[protoff] = nxt;
  824 
  825                 /* Copyback the saved (uncooked) network headers. */
  826                 m_copyback(m, 0, skip, ptr);
  827         } else {
  828                 /* Fix the Next Protocol field. */
  829                 m_copyback(m, protoff, sizeof(u_int8_t), &nxt);
  830         }
  831 
  832         free(tc, M_XDATA), tc = NULL;                   /* No longer needed */
  833 
  834         /*
  835          * Header is now authenticated.
  836          */
  837         m->m_flags |= M_AUTHIPHDR|M_AUTHIPDGM;
  838 
  839         /*
  840          * Update replay sequence number, if appropriate.
  841          */
  842         if (sav->replay) {
  843                 u_int32_t seq;
  844 
  845                 m_copydata(m, skip + offsetof(struct newah, ah_seq),
  846                            sizeof (seq), (caddr_t) &seq);
  847                 if (ipsec_updatereplay(ntohl(seq), sav)) {
  848                         ahstat.ahs_replay++;
  849                         error = ENOBUFS;                        /*XXX as above*/
  850                         goto bad;
  851                 }
  852         }
  853 
  854         /*
  855          * Remove the AH header and authenticator from the mbuf.
  856          */
  857         error = m_striphdr(m, skip, rplen + authsize);
  858         if (error) {
  859                 DPRINTF(("ah_input_cb: mangled mbuf chain for SA %s/%08lx\n",
  860                     ipsec_address(&saidx->dst), (u_long) ntohl(sav->spi)));
  861 
  862                 ahstat.ahs_hdrops++;
  863                 goto bad;
  864         }
  865 
  866         IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag);
  867 
  868         KEY_FREESAV(&sav);
  869         splx(s);
  870         return error;
  871 bad:
  872         if (sav)
  873                 KEY_FREESAV(&sav);
  874         splx(s);
  875         if (m != NULL)
  876                 m_freem(m);
  877         if (tc != NULL)
  878                 free(tc, M_XDATA);
  879         if (crp != NULL)
  880                 crypto_freereq(crp);
  881         return error;
  882 }
  883 
  884 /*
  885  * AH output routine, called by ipsec[46]_process_packet().
  886  */
  887 static int
  888 ah_output(
  889         struct mbuf *m,
  890         struct ipsecrequest *isr,
  891         struct mbuf **mp,
  892         int skip,
  893         int protoff)
  894 {
  895         struct secasvar *sav;
  896         struct auth_hash *ahx;
  897         struct cryptodesc *crda;
  898         struct tdb_crypto *tc;
  899         struct mbuf *mi;
  900         struct cryptop *crp;
  901         u_int16_t iplen;
  902         int error, rplen, authsize, maxpacketsize, roff;
  903         u_int8_t prot;
  904         struct newah *ah;
  905 
  906 #if 0
  907         SPLASSERT(net, "ah_output");
  908 #endif
  909 
  910         sav = isr->sav;
  911         KASSERT(sav != NULL, ("ah_output: null SA"));
  912         ahx = sav->tdb_authalgxform;
  913         KASSERT(ahx != NULL, ("ah_output: null authentication xform"));
  914 
  915         ahstat.ahs_output++;
  916 
  917         /* Figure out header size. */
  918         rplen = HDRSIZE(sav);
  919 
  920         /* Check for maximum packet size violations. */
  921         switch (sav->sah->saidx.dst.sa.sa_family) {
  922 #ifdef INET
  923         case AF_INET:
  924                 maxpacketsize = IP_MAXPACKET;
  925                 break;
  926 #endif /* INET */
  927 #ifdef INET6
  928         case AF_INET6:
  929                 maxpacketsize = IPV6_MAXPACKET;
  930                 break;
  931 #endif /* INET6 */
  932         default:
  933                 DPRINTF(("ah_output: unknown/unsupported protocol "
  934                     "family %u, SA %s/%08lx\n",
  935                     sav->sah->saidx.dst.sa.sa_family,
  936                     ipsec_address(&sav->sah->saidx.dst),
  937                     (u_long) ntohl(sav->spi)));
  938                 ahstat.ahs_nopf++;
  939                 error = EPFNOSUPPORT;
  940                 goto bad;
  941         }
  942         authsize = AUTHSIZE(sav);
  943         if (rplen + authsize + m->m_pkthdr.len > maxpacketsize) {
  944                 DPRINTF(("ah_output: packet in SA %s/%08lx got too big "
  945                     "(len %u, max len %u)\n",
  946                     ipsec_address(&sav->sah->saidx.dst),
  947                     (u_long) ntohl(sav->spi),
  948                     rplen + authsize + m->m_pkthdr.len, maxpacketsize));
  949                 ahstat.ahs_toobig++;
  950                 error = EMSGSIZE;
  951                 goto bad;
  952         }
  953 
  954         /* Update the counters. */
  955         ahstat.ahs_obytes += m->m_pkthdr.len - skip;
  956 
  957         m = m_clone(m);
  958         if (m == NULL) {
  959                 DPRINTF(("ah_output: cannot clone mbuf chain, SA %s/%08lx\n",
  960                     ipsec_address(&sav->sah->saidx.dst),
  961                     (u_long) ntohl(sav->spi)));
  962                 ahstat.ahs_hdrops++;
  963                 error = ENOBUFS;
  964                 goto bad;
  965         }
  966 
  967         /* Inject AH header. */
  968         mi = m_makespace(m, skip, rplen + authsize, &roff);
  969         if (mi == NULL) {
  970                 DPRINTF(("ah_output: failed to inject %u byte AH header for SA "
  971                     "%s/%08lx\n",
  972                     rplen + authsize,
  973                     ipsec_address(&sav->sah->saidx.dst),
  974                     (u_long) ntohl(sav->spi)));
  975                 ahstat.ahs_hdrops++;            /*XXX differs from openbsd */
  976                 error = ENOBUFS;
  977                 goto bad;
  978         }
  979 
  980         /*
  981          * The AH header is guaranteed by m_makespace() to be in
  982          * contiguous memory, at roff bytes offset into the returned mbuf.
  983          */
  984         ah = (struct newah *)(mtod(mi, caddr_t) + roff);
  985 
  986         /* Initialize the AH header. */
  987         m_copydata(m, protoff, sizeof(u_int8_t), (caddr_t) &ah->ah_nxt);
  988         ah->ah_len = (rplen + authsize - sizeof(struct ah)) / sizeof(u_int32_t);
  989         ah->ah_reserve = 0;
  990         ah->ah_spi = sav->spi;
  991 
  992         /* Zeroize authenticator. */
  993         m_copyback(m, skip + rplen, authsize, ipseczeroes);
  994 
  995         /* Insert packet replay counter, as requested.  */
  996         if (sav->replay) {
  997                 if (sav->replay->count == ~0 &&
  998                     (sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
  999                         DPRINTF(("ah_output: replay counter wrapped for SA "
 1000                                 "%s/%08lx\n",
 1001                                 ipsec_address(&sav->sah->saidx.dst),
 1002                                 (u_long) ntohl(sav->spi)));
 1003                         ahstat.ahs_wrap++;
 1004                         error = EINVAL;
 1005                         goto bad;
 1006                 }
 1007                 sav->replay->count++;
 1008                 ah->ah_seq = htonl(sav->replay->count);
 1009         }
 1010 
 1011         /* Get crypto descriptors. */
 1012         crp = crypto_getreq(1);
 1013         if (crp == NULL) {
 1014                 DPRINTF(("ah_output: failed to acquire crypto descriptors\n"));
 1015                 ahstat.ahs_crypto++;
 1016                 error = ENOBUFS;
 1017                 goto bad;
 1018         }
 1019 
 1020         crda = crp->crp_desc;
 1021 
 1022         crda->crd_skip = 0;
 1023         crda->crd_inject = skip + rplen;
 1024         crda->crd_len = m->m_pkthdr.len;
 1025 
 1026         /* Authentication operation. */
 1027         crda->crd_alg = ahx->type;
 1028         crda->crd_key = _KEYBUF(sav->key_auth);
 1029         crda->crd_klen = _KEYBITS(sav->key_auth);
 1030 
 1031         /* Allocate IPsec-specific opaque crypto info. */
 1032         tc = (struct tdb_crypto *) malloc(
 1033                 sizeof(struct tdb_crypto) + skip, M_XDATA, M_NOWAIT|M_ZERO);
 1034         if (tc == NULL) {
 1035                 crypto_freereq(crp);
 1036                 DPRINTF(("ah_output: failed to allocate tdb_crypto\n"));
 1037                 ahstat.ahs_crypto++;
 1038                 error = ENOBUFS;
 1039                 goto bad;
 1040         }
 1041 
 1042         /* Save the skipped portion of the packet. */
 1043         m_copydata(m, 0, skip, (caddr_t) (tc + 1));
 1044 
 1045         /*
 1046          * Fix IP header length on the header used for
 1047          * authentication. We don't need to fix the original
 1048          * header length as it will be fixed by our caller.
 1049          */
 1050         switch (sav->sah->saidx.dst.sa.sa_family) {
 1051 #ifdef INET
 1052         case AF_INET:
 1053                 bcopy(((caddr_t)(tc + 1)) +
 1054                     offsetof(struct ip, ip_len),
 1055                     (caddr_t) &iplen, sizeof(u_int16_t));
 1056                 iplen = htons(ntohs(iplen) + rplen + authsize);
 1057                 m_copyback(m, offsetof(struct ip, ip_len),
 1058                     sizeof(u_int16_t), (caddr_t) &iplen);
 1059                 break;
 1060 #endif /* INET */
 1061 
 1062 #ifdef INET6
 1063         case AF_INET6:
 1064                 bcopy(((caddr_t)(tc + 1)) +
 1065                     offsetof(struct ip6_hdr, ip6_plen),
 1066                     (caddr_t) &iplen, sizeof(u_int16_t));
 1067                 iplen = htons(ntohs(iplen) + rplen + authsize);
 1068                 m_copyback(m, offsetof(struct ip6_hdr, ip6_plen),
 1069                     sizeof(u_int16_t), (caddr_t) &iplen);
 1070                 break;
 1071 #endif /* INET6 */
 1072         }
 1073 
 1074         /* Fix the Next Header field in saved header. */
 1075         ((u_int8_t *) (tc + 1))[protoff] = IPPROTO_AH;
 1076 
 1077         /* Update the Next Protocol field in the IP header. */
 1078         prot = IPPROTO_AH;
 1079         m_copyback(m, protoff, sizeof(u_int8_t), (caddr_t) &prot);
 1080 
 1081         /* "Massage" the packet headers for crypto processing. */
 1082         error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
 1083                         skip, ahx->type, 1);
 1084         if (error != 0) {
 1085                 m = NULL;       /* mbuf was free'd by ah_massage_headers. */
 1086                 free(tc, M_XDATA);
 1087                 crypto_freereq(crp);
 1088                 goto bad;
 1089         }
 1090 
 1091         /* Crypto operation descriptor. */
 1092         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
 1093         crp->crp_flags = CRYPTO_F_IMBUF;
 1094         crp->crp_buf = (caddr_t) m;
 1095         crp->crp_callback = ah_output_cb;
 1096         crp->crp_sid = sav->tdb_cryptoid;
 1097         crp->crp_opaque = (caddr_t) tc;
 1098 
 1099         /* These are passed as-is to the callback. */
 1100         tc->tc_isr = isr;
 1101         tc->tc_spi = sav->spi;
 1102         tc->tc_dst = sav->sah->saidx.dst;
 1103         tc->tc_proto = sav->sah->saidx.proto;
 1104         tc->tc_skip = skip;
 1105         tc->tc_protoff = protoff;
 1106 
 1107         return crypto_dispatch(crp);
 1108 bad:
 1109         if (m)
 1110                 m_freem(m);
 1111         return (error);
 1112 }
 1113 
 1114 /*
 1115  * AH output callback from the crypto driver.
 1116  */
 1117 static int
 1118 ah_output_cb(struct cryptop *crp)
 1119 {
 1120         int skip, protoff, error;
 1121         struct tdb_crypto *tc;
 1122         struct ipsecrequest *isr;
 1123         struct secasvar *sav;
 1124         struct mbuf *m;
 1125         caddr_t ptr;
 1126         int s, err;
 1127 
 1128         tc = (struct tdb_crypto *) crp->crp_opaque;
 1129         KASSERT(tc != NULL, ("ah_output_cb: null opaque data area!"));
 1130         skip = tc->tc_skip;
 1131         protoff = tc->tc_protoff;
 1132         ptr = (caddr_t) (tc + 1);
 1133         m = (struct mbuf *) crp->crp_buf;
 1134 
 1135         s = splnet();
 1136 
 1137         isr = tc->tc_isr;
 1138         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
 1139         if (sav == NULL) {
 1140                 ahstat.ahs_notdb++;
 1141                 DPRINTF(("ah_output_cb: SA expired while in crypto\n"));
 1142                 error = ENOBUFS;                /*XXX*/
 1143                 goto bad;
 1144         }
 1145         KASSERT(isr->sav == sav, ("ah_output_cb: SA changed\n"));
 1146 
 1147         /* Check for crypto errors. */
 1148         if (crp->crp_etype) {
 1149                 if (sav->tdb_cryptoid != 0)
 1150                         sav->tdb_cryptoid = crp->crp_sid;
 1151 
 1152                 if (crp->crp_etype == EAGAIN) {
 1153                         KEY_FREESAV(&sav);
 1154                         splx(s);
 1155                         return crypto_dispatch(crp);
 1156                 }
 1157 
 1158                 ahstat.ahs_noxform++;
 1159                 DPRINTF(("ah_output_cb: crypto error %d\n", crp->crp_etype));
 1160                 error = crp->crp_etype;
 1161                 goto bad;
 1162         }
 1163 
 1164         /* Shouldn't happen... */
 1165         if (m == NULL) {
 1166                 ahstat.ahs_crypto++;
 1167                 DPRINTF(("ah_output_cb: bogus returned buffer from crypto\n"));
 1168                 error = EINVAL;
 1169                 goto bad;
 1170         }
 1171         ahstat.ahs_hist[sav->alg_auth]++;
 1172 
 1173         /*
 1174          * Copy original headers (with the new protocol number) back
 1175          * in place.
 1176          */
 1177         m_copyback(m, 0, skip, ptr);
 1178 
 1179         /* No longer needed. */
 1180         free(tc, M_XDATA);
 1181         crypto_freereq(crp);
 1182 
 1183         /* NB: m is reclaimed by ipsec_process_done. */
 1184         err = ipsec_process_done(m, isr);
 1185         KEY_FREESAV(&sav);
 1186         splx(s);
 1187         return err;
 1188 bad:
 1189         if (sav)
 1190                 KEY_FREESAV(&sav);
 1191         splx(s);
 1192         if (m)
 1193                 m_freem(m);
 1194         free(tc, M_XDATA);
 1195         crypto_freereq(crp);
 1196         return error;
 1197 }
 1198 
 1199 static struct xformsw ah_xformsw = {
 1200         XF_AH,          XFT_AUTH,       "IPsec AH",
 1201         ah_init,        ah_zeroize,     ah_input,       ah_output,
 1202 };
 1203 
 1204 static void
 1205 ah_attach(void)
 1206 {
 1207         xform_register(&ah_xformsw);
 1208 }
 1209 SYSINIT(ah_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ah_attach, NULL);

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