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: stable/4/sys/netipsec/xform_ah.c 117175 2003-07-02 17:06:55Z 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         SPLASSERT(net, "ah_input");
  567 
  568         KASSERT(sav != NULL, ("ah_input: null SA"));
  569         KASSERT(sav->key_auth != NULL,
  570                 ("ah_input: null authentication key"));
  571         KASSERT(sav->tdb_authalgxform != NULL,
  572                 ("ah_input: null authentication xform"));
  573 
  574         /* Figure out header size. */
  575         rplen = HDRSIZE(sav);
  576 
  577         /* XXX don't pullup, just copy header */
  578         IP6_EXTHDR_GET(ah, struct newah *, m, skip, rplen);
  579         if (ah == NULL) {
  580                 DPRINTF(("ah_input: cannot pullup header\n"));
  581                 ahstat.ahs_hdrops++;            /*XXX*/
  582                 m_freem(m);
  583                 return ENOBUFS;
  584         }
  585 
  586         /* Check replay window, if applicable. */
  587         if (sav->replay && !ipsec_chkreplay(ntohl(ah->ah_seq), sav)) {
  588                 ahstat.ahs_replay++;
  589                 DPRINTF(("ah_input: packet replay failure: %s\n",
  590                           ipsec_logsastr(sav)));
  591                 m_freem(m);
  592                 return ENOBUFS;
  593         }
  594 
  595         /* Verify AH header length. */
  596         hl = ah->ah_len * sizeof (u_int32_t);
  597         ahx = sav->tdb_authalgxform;
  598         authsize = AUTHSIZE(sav);
  599         if (hl != authsize + rplen - sizeof (struct ah)) {
  600                 DPRINTF(("ah_input: bad authenticator length %u (expecting %lu)"
  601                         " for packet in SA %s/%08lx\n",
  602                         hl, (u_long) (authsize + rplen - sizeof (struct ah)),
  603                         ipsec_address(&sav->sah->saidx.dst),
  604                         (u_long) ntohl(sav->spi)));
  605                 ahstat.ahs_badauthl++;
  606                 m_freem(m);
  607                 return EACCES;
  608         }
  609         ahstat.ahs_ibytes += m->m_pkthdr.len - skip - hl;
  610 
  611         /* Get crypto descriptors. */
  612         crp = crypto_getreq(1);
  613         if (crp == NULL) {
  614                 DPRINTF(("ah_input: failed to acquire crypto descriptor\n"));
  615                 ahstat.ahs_crypto++;
  616                 m_freem(m);
  617                 return ENOBUFS;
  618         }
  619 
  620         crda = crp->crp_desc;
  621         KASSERT(crda != NULL, ("ah_input: null crypto descriptor"));
  622 
  623         crda->crd_skip = 0;
  624         crda->crd_len = m->m_pkthdr.len;
  625         crda->crd_inject = skip + rplen;
  626 
  627         /* Authentication operation. */
  628         crda->crd_alg = ahx->type;
  629         crda->crd_key = _KEYBUF(sav->key_auth);
  630         crda->crd_klen = _KEYBITS(sav->key_auth);
  631 
  632         /* Find out if we've already done crypto. */
  633         for (mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, NULL);
  634              mtag != NULL;
  635              mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, mtag)) {
  636                 tdbi = (struct tdb_ident *) (mtag + 1);
  637                 if (tdbi->proto == sav->sah->saidx.proto &&
  638                     tdbi->spi == sav->spi &&
  639                     !bcmp(&tdbi->dst, &sav->sah->saidx.dst,
  640                           sizeof (union sockaddr_union)))
  641                         break;
  642         }
  643 
  644         /* Allocate IPsec-specific opaque crypto info. */
  645         if (mtag == NULL) {
  646                 tc = (struct tdb_crypto *) malloc(sizeof (struct tdb_crypto) +
  647                         skip + rplen + authsize, M_XDATA, M_NOWAIT|M_ZERO);
  648         } else {
  649                 /* Hash verification has already been done successfully. */
  650                 tc = (struct tdb_crypto *) malloc(sizeof (struct tdb_crypto),
  651                                                     M_XDATA, M_NOWAIT|M_ZERO);
  652         }
  653         if (tc == NULL) {
  654                 DPRINTF(("ah_input: failed to allocate tdb_crypto\n"));
  655                 ahstat.ahs_crypto++;
  656                 crypto_freereq(crp);
  657                 m_freem(m);
  658                 return ENOBUFS;
  659         }
  660 
  661         /* Only save information if crypto processing is needed. */
  662         if (mtag == NULL) {
  663                 int error;
  664 
  665                 /*
  666                  * Save the authenticator, the skipped portion of the packet,
  667                  * and the AH header.
  668                  */
  669                 m_copydata(m, 0, skip + rplen + authsize, (caddr_t)(tc+1));
  670 
  671                 /* Zeroize the authenticator on the packet. */
  672                 m_copyback(m, skip + rplen, authsize, ipseczeroes);
  673 
  674                 /* "Massage" the packet headers for crypto processing. */
  675                 error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
  676                     skip, ahx->type, 0);
  677                 if (error != 0) {
  678                         /* NB: mbuf is free'd by ah_massage_headers */
  679                         ahstat.ahs_hdrops++;
  680                         free(tc, M_XDATA);
  681                         crypto_freereq(crp);
  682                         return error;
  683                 }
  684         }
  685 
  686         /* Crypto operation descriptor. */
  687         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
  688         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
  689         crp->crp_buf = (caddr_t) m;
  690         crp->crp_callback = ah_input_cb;
  691         crp->crp_sid = sav->tdb_cryptoid;
  692         crp->crp_opaque = (caddr_t) tc;
  693 
  694         /* These are passed as-is to the callback. */
  695         tc->tc_spi = sav->spi;
  696         tc->tc_dst = sav->sah->saidx.dst;
  697         tc->tc_proto = sav->sah->saidx.proto;
  698         tc->tc_nxt = ah->ah_nxt;
  699         tc->tc_protoff = protoff;
  700         tc->tc_skip = skip;
  701         tc->tc_ptr = (caddr_t) mtag; /* Save the mtag we've identified. */
  702 
  703         if (mtag == NULL)
  704                 return crypto_dispatch(crp);
  705         else
  706                 return ah_input_cb(crp);
  707 }
  708 
  709 #ifdef INET6
  710 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do {              \
  711         if (saidx->dst.sa.sa_family == AF_INET6) {                           \
  712                 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
  713         } else {                                                             \
  714                 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
  715         }                                                                    \
  716 } while (0)
  717 #else
  718 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag)                   \
  719         (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
  720 #endif
  721 
  722 /*
  723  * AH input callback from the crypto driver.
  724  */
  725 static int
  726 ah_input_cb(struct cryptop *crp)
  727 {
  728         int rplen, error, skip, protoff;
  729         unsigned char calc[AH_ALEN_MAX];
  730         struct mbuf *m;
  731         struct cryptodesc *crd;
  732         struct auth_hash *ahx;
  733         struct tdb_crypto *tc;
  734         struct m_tag *mtag;
  735         struct secasvar *sav;
  736         struct secasindex *saidx;
  737         u_int8_t nxt;
  738         caddr_t ptr;
  739         int s, authsize;
  740 
  741         crd = crp->crp_desc;
  742 
  743         tc = (struct tdb_crypto *) crp->crp_opaque;
  744         KASSERT(tc != NULL, ("ah_input_cb: null opaque crypto data area!"));
  745         skip = tc->tc_skip;
  746         nxt = tc->tc_nxt;
  747         protoff = tc->tc_protoff;
  748         mtag = (struct m_tag *) tc->tc_ptr;
  749         m = (struct mbuf *) crp->crp_buf;
  750 
  751         s = splnet();
  752 
  753         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
  754         if (sav == NULL) {
  755                 ahstat.ahs_notdb++;
  756                 DPRINTF(("ah_input_cb: SA expired while in crypto\n"));
  757                 error = ENOBUFS;                /*XXX*/
  758                 goto bad;
  759         }
  760 
  761         saidx = &sav->sah->saidx;
  762         KASSERT(saidx->dst.sa.sa_family == AF_INET ||
  763                 saidx->dst.sa.sa_family == AF_INET6,
  764                 ("ah_input_cb: unexpected protocol family %u",
  765                  saidx->dst.sa.sa_family));
  766 
  767         ahx = (struct auth_hash *) sav->tdb_authalgxform;
  768 
  769         /* Check for crypto errors. */
  770         if (crp->crp_etype) {
  771                 if (sav->tdb_cryptoid != 0)
  772                         sav->tdb_cryptoid = crp->crp_sid;
  773 
  774                 if (crp->crp_etype == EAGAIN)
  775                         return crypto_dispatch(crp);
  776 
  777                 ahstat.ahs_noxform++;
  778                 DPRINTF(("ah_input_cb: crypto error %d\n", crp->crp_etype));
  779                 error = crp->crp_etype;
  780                 goto bad;
  781         } else {
  782                 ahstat.ahs_hist[sav->alg_auth]++;
  783                 crypto_freereq(crp);            /* No longer needed. */
  784                 crp = NULL;
  785         }
  786 
  787         /* Shouldn't happen... */
  788         if (m == NULL) {
  789                 ahstat.ahs_crypto++;
  790                 DPRINTF(("ah_input_cb: bogus returned buffer from crypto\n"));
  791                 error = EINVAL;
  792                 goto bad;
  793         }
  794 
  795         /* Figure out header size. */
  796         rplen = HDRSIZE(sav);
  797         authsize = AUTHSIZE(sav);
  798 
  799         /* Copy authenticator off the packet. */
  800         m_copydata(m, skip + rplen, authsize, calc);
  801 
  802         /*
  803          * If we have an mtag, we don't need to verify the authenticator --
  804          * it has been verified by an IPsec-aware NIC.
  805          */
  806         if (mtag == NULL) {
  807                 ptr = (caddr_t) (tc + 1);
  808 
  809                 /* Verify authenticator. */
  810                 if (bcmp(ptr + skip + rplen, calc, authsize)) {
  811                         DPRINTF(("ah_input: authentication hash mismatch "
  812                             "for packet in SA %s/%08lx\n",
  813                             ipsec_address(&saidx->dst),
  814                             (u_long) ntohl(sav->spi)));
  815                         ahstat.ahs_badauth++;
  816                         error = EACCES;
  817                         goto bad;
  818                 }
  819 
  820                 /* Fix the Next Protocol field. */
  821                 ((u_int8_t *) ptr)[protoff] = nxt;
  822 
  823                 /* Copyback the saved (uncooked) network headers. */
  824                 m_copyback(m, 0, skip, ptr);
  825         } else {
  826                 /* Fix the Next Protocol field. */
  827                 m_copyback(m, protoff, sizeof(u_int8_t), &nxt);
  828         }
  829 
  830         free(tc, M_XDATA), tc = NULL;                   /* No longer needed */
  831 
  832         /*
  833          * Header is now authenticated.
  834          */
  835         m->m_flags |= M_AUTHIPHDR|M_AUTHIPDGM;
  836 
  837         /*
  838          * Update replay sequence number, if appropriate.
  839          */
  840         if (sav->replay) {
  841                 u_int32_t seq;
  842 
  843                 m_copydata(m, skip + offsetof(struct newah, ah_seq),
  844                            sizeof (seq), (caddr_t) &seq);
  845                 if (ipsec_updatereplay(ntohl(seq), sav)) {
  846                         ahstat.ahs_replay++;
  847                         error = ENOBUFS;                        /*XXX as above*/
  848                         goto bad;
  849                 }
  850         }
  851 
  852         /*
  853          * Remove the AH header and authenticator from the mbuf.
  854          */
  855         error = m_striphdr(m, skip, rplen + authsize);
  856         if (error) {
  857                 DPRINTF(("ah_input_cb: mangled mbuf chain for SA %s/%08lx\n",
  858                     ipsec_address(&saidx->dst), (u_long) ntohl(sav->spi)));
  859 
  860                 ahstat.ahs_hdrops++;
  861                 goto bad;
  862         }
  863 
  864         IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag);
  865 
  866         KEY_FREESAV(&sav);
  867         splx(s);
  868         return error;
  869 bad:
  870         if (sav)
  871                 KEY_FREESAV(&sav);
  872         splx(s);
  873         if (m != NULL)
  874                 m_freem(m);
  875         if (tc != NULL)
  876                 free(tc, M_XDATA);
  877         if (crp != NULL)
  878                 crypto_freereq(crp);
  879         return error;
  880 }
  881 
  882 /*
  883  * AH output routine, called by ipsec[46]_process_packet().
  884  */
  885 static int
  886 ah_output(
  887         struct mbuf *m,
  888         struct ipsecrequest *isr,
  889         struct mbuf **mp,
  890         int skip,
  891         int protoff)
  892 {
  893         struct secasvar *sav;
  894         struct auth_hash *ahx;
  895         struct cryptodesc *crda;
  896         struct tdb_crypto *tc;
  897         struct mbuf *mi;
  898         struct cryptop *crp;
  899         u_int16_t iplen;
  900         int error, rplen, authsize, maxpacketsize, roff;
  901         u_int8_t prot;
  902         struct newah *ah;
  903 
  904         SPLASSERT(net, "ah_output");
  905 
  906         sav = isr->sav;
  907         KASSERT(sav != NULL, ("ah_output: null SA"));
  908         ahx = sav->tdb_authalgxform;
  909         KASSERT(ahx != NULL, ("ah_output: null authentication xform"));
  910 
  911         ahstat.ahs_output++;
  912 
  913         /* Figure out header size. */
  914         rplen = HDRSIZE(sav);
  915 
  916         /* Check for maximum packet size violations. */
  917         switch (sav->sah->saidx.dst.sa.sa_family) {
  918 #ifdef INET
  919         case AF_INET:
  920                 maxpacketsize = IP_MAXPACKET;
  921                 break;
  922 #endif /* INET */
  923 #ifdef INET6
  924         case AF_INET6:
  925                 maxpacketsize = IPV6_MAXPACKET;
  926                 break;
  927 #endif /* INET6 */
  928         default:
  929                 DPRINTF(("ah_output: unknown/unsupported protocol "
  930                     "family %u, SA %s/%08lx\n",
  931                     sav->sah->saidx.dst.sa.sa_family,
  932                     ipsec_address(&sav->sah->saidx.dst),
  933                     (u_long) ntohl(sav->spi)));
  934                 ahstat.ahs_nopf++;
  935                 error = EPFNOSUPPORT;
  936                 goto bad;
  937         }
  938         authsize = AUTHSIZE(sav);
  939         if (rplen + authsize + m->m_pkthdr.len > maxpacketsize) {
  940                 DPRINTF(("ah_output: packet in SA %s/%08lx got too big "
  941                     "(len %u, max len %u)\n",
  942                     ipsec_address(&sav->sah->saidx.dst),
  943                     (u_long) ntohl(sav->spi),
  944                     rplen + authsize + m->m_pkthdr.len, maxpacketsize));
  945                 ahstat.ahs_toobig++;
  946                 error = EMSGSIZE;
  947                 goto bad;
  948         }
  949 
  950         /* Update the counters. */
  951         ahstat.ahs_obytes += m->m_pkthdr.len - skip;
  952 
  953         m = m_clone(m);
  954         if (m == NULL) {
  955                 DPRINTF(("ah_output: cannot clone mbuf chain, SA %s/%08lx\n",
  956                     ipsec_address(&sav->sah->saidx.dst),
  957                     (u_long) ntohl(sav->spi)));
  958                 ahstat.ahs_hdrops++;
  959                 error = ENOBUFS;
  960                 goto bad;
  961         }
  962 
  963         /* Inject AH header. */
  964         mi = m_makespace(m, skip, rplen + authsize, &roff);
  965         if (mi == NULL) {
  966                 DPRINTF(("ah_output: failed to inject %u byte AH header for SA "
  967                     "%s/%08lx\n",
  968                     rplen + authsize,
  969                     ipsec_address(&sav->sah->saidx.dst),
  970                     (u_long) ntohl(sav->spi)));
  971                 ahstat.ahs_hdrops++;            /*XXX differs from openbsd */
  972                 error = ENOBUFS;
  973                 goto bad;
  974         }
  975 
  976         /*
  977          * The AH header is guaranteed by m_makespace() to be in
  978          * contiguous memory, at roff bytes offset into the returned mbuf.
  979          */
  980         ah = (struct newah *)(mtod(mi, caddr_t) + roff);
  981 
  982         /* Initialize the AH header. */
  983         m_copydata(m, protoff, sizeof(u_int8_t), (caddr_t) &ah->ah_nxt);
  984         ah->ah_len = (rplen + authsize - sizeof(struct ah)) / sizeof(u_int32_t);
  985         ah->ah_reserve = 0;
  986         ah->ah_spi = sav->spi;
  987 
  988         /* Zeroize authenticator. */
  989         m_copyback(m, skip + rplen, authsize, ipseczeroes);
  990 
  991         /* Insert packet replay counter, as requested.  */
  992         if (sav->replay) {
  993                 if (sav->replay->count == ~0 &&
  994                     (sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
  995                         DPRINTF(("ah_output: replay counter wrapped for SA "
  996                                 "%s/%08lx\n",
  997                                 ipsec_address(&sav->sah->saidx.dst),
  998                                 (u_long) ntohl(sav->spi)));
  999                         ahstat.ahs_wrap++;
 1000                         error = EINVAL;
 1001                         goto bad;
 1002                 }
 1003                 sav->replay->count++;
 1004                 ah->ah_seq = htonl(sav->replay->count);
 1005         }
 1006 
 1007         /* Get crypto descriptors. */
 1008         crp = crypto_getreq(1);
 1009         if (crp == NULL) {
 1010                 DPRINTF(("ah_output: failed to acquire crypto descriptors\n"));
 1011                 ahstat.ahs_crypto++;
 1012                 error = ENOBUFS;
 1013                 goto bad;
 1014         }
 1015 
 1016         crda = crp->crp_desc;
 1017 
 1018         crda->crd_skip = 0;
 1019         crda->crd_inject = skip + rplen;
 1020         crda->crd_len = m->m_pkthdr.len;
 1021 
 1022         /* Authentication operation. */
 1023         crda->crd_alg = ahx->type;
 1024         crda->crd_key = _KEYBUF(sav->key_auth);
 1025         crda->crd_klen = _KEYBITS(sav->key_auth);
 1026 
 1027         /* Allocate IPsec-specific opaque crypto info. */
 1028         tc = (struct tdb_crypto *) malloc(
 1029                 sizeof(struct tdb_crypto) + skip, M_XDATA, M_NOWAIT|M_ZERO);
 1030         if (tc == NULL) {
 1031                 crypto_freereq(crp);
 1032                 DPRINTF(("ah_output: failed to allocate tdb_crypto\n"));
 1033                 ahstat.ahs_crypto++;
 1034                 error = ENOBUFS;
 1035                 goto bad;
 1036         }
 1037 
 1038         /* Save the skipped portion of the packet. */
 1039         m_copydata(m, 0, skip, (caddr_t) (tc + 1));
 1040 
 1041         /*
 1042          * Fix IP header length on the header used for
 1043          * authentication. We don't need to fix the original
 1044          * header length as it will be fixed by our caller.
 1045          */
 1046         switch (sav->sah->saidx.dst.sa.sa_family) {
 1047 #ifdef INET
 1048         case AF_INET:
 1049                 bcopy(((caddr_t)(tc + 1)) +
 1050                     offsetof(struct ip, ip_len),
 1051                     (caddr_t) &iplen, sizeof(u_int16_t));
 1052                 iplen = htons(ntohs(iplen) + rplen + authsize);
 1053                 m_copyback(m, offsetof(struct ip, ip_len),
 1054                     sizeof(u_int16_t), (caddr_t) &iplen);
 1055                 break;
 1056 #endif /* INET */
 1057 
 1058 #ifdef INET6
 1059         case AF_INET6:
 1060                 bcopy(((caddr_t)(tc + 1)) +
 1061                     offsetof(struct ip6_hdr, ip6_plen),
 1062                     (caddr_t) &iplen, sizeof(u_int16_t));
 1063                 iplen = htons(ntohs(iplen) + rplen + authsize);
 1064                 m_copyback(m, offsetof(struct ip6_hdr, ip6_plen),
 1065                     sizeof(u_int16_t), (caddr_t) &iplen);
 1066                 break;
 1067 #endif /* INET6 */
 1068         }
 1069 
 1070         /* Fix the Next Header field in saved header. */
 1071         ((u_int8_t *) (tc + 1))[protoff] = IPPROTO_AH;
 1072 
 1073         /* Update the Next Protocol field in the IP header. */
 1074         prot = IPPROTO_AH;
 1075         m_copyback(m, protoff, sizeof(u_int8_t), (caddr_t) &prot);
 1076 
 1077         /* "Massage" the packet headers for crypto processing. */
 1078         error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
 1079                         skip, ahx->type, 1);
 1080         if (error != 0) {
 1081                 m = NULL;       /* mbuf was free'd by ah_massage_headers. */
 1082                 free(tc, M_XDATA);
 1083                 crypto_freereq(crp);
 1084                 goto bad;
 1085         }
 1086 
 1087         /* Crypto operation descriptor. */
 1088         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
 1089         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
 1090         crp->crp_buf = (caddr_t) m;
 1091         crp->crp_callback = ah_output_cb;
 1092         crp->crp_sid = sav->tdb_cryptoid;
 1093         crp->crp_opaque = (caddr_t) tc;
 1094 
 1095         /* These are passed as-is to the callback. */
 1096         tc->tc_isr = isr;
 1097         tc->tc_spi = sav->spi;
 1098         tc->tc_dst = sav->sah->saidx.dst;
 1099         tc->tc_proto = sav->sah->saidx.proto;
 1100         tc->tc_skip = skip;
 1101         tc->tc_protoff = protoff;
 1102 
 1103         return crypto_dispatch(crp);
 1104 bad:
 1105         if (m)
 1106                 m_freem(m);
 1107         return (error);
 1108 }
 1109 
 1110 /*
 1111  * AH output callback from the crypto driver.
 1112  */
 1113 static int
 1114 ah_output_cb(struct cryptop *crp)
 1115 {
 1116         int skip, protoff, error;
 1117         struct tdb_crypto *tc;
 1118         struct ipsecrequest *isr;
 1119         struct secasvar *sav;
 1120         struct mbuf *m;
 1121         caddr_t ptr;
 1122         int s, err;
 1123 
 1124         tc = (struct tdb_crypto *) crp->crp_opaque;
 1125         KASSERT(tc != NULL, ("ah_output_cb: null opaque data area!"));
 1126         skip = tc->tc_skip;
 1127         protoff = tc->tc_protoff;
 1128         ptr = (caddr_t) (tc + 1);
 1129         m = (struct mbuf *) crp->crp_buf;
 1130 
 1131         s = splnet();
 1132 
 1133         isr = tc->tc_isr;
 1134         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
 1135         if (sav == NULL) {
 1136                 ahstat.ahs_notdb++;
 1137                 DPRINTF(("ah_output_cb: SA expired while in crypto\n"));
 1138                 error = ENOBUFS;                /*XXX*/
 1139                 goto bad;
 1140         }
 1141         KASSERT(isr->sav == sav, ("ah_output_cb: SA changed\n"));
 1142 
 1143         /* Check for crypto errors. */
 1144         if (crp->crp_etype) {
 1145                 if (sav->tdb_cryptoid != 0)
 1146                         sav->tdb_cryptoid = crp->crp_sid;
 1147 
 1148                 if (crp->crp_etype == EAGAIN) {
 1149                         KEY_FREESAV(&sav);
 1150                         splx(s);
 1151                         return crypto_dispatch(crp);
 1152                 }
 1153 
 1154                 ahstat.ahs_noxform++;
 1155                 DPRINTF(("ah_output_cb: crypto error %d\n", crp->crp_etype));
 1156                 error = crp->crp_etype;
 1157                 goto bad;
 1158         }
 1159 
 1160         /* Shouldn't happen... */
 1161         if (m == NULL) {
 1162                 ahstat.ahs_crypto++;
 1163                 DPRINTF(("ah_output_cb: bogus returned buffer from crypto\n"));
 1164                 error = EINVAL;
 1165                 goto bad;
 1166         }
 1167         ahstat.ahs_hist[sav->alg_auth]++;
 1168 
 1169         /*
 1170          * Copy original headers (with the new protocol number) back
 1171          * in place.
 1172          */
 1173         m_copyback(m, 0, skip, ptr);
 1174 
 1175         /* No longer needed. */
 1176         free(tc, M_XDATA);
 1177         crypto_freereq(crp);
 1178 
 1179         /* NB: m is reclaimed by ipsec_process_done. */
 1180         err = ipsec_process_done(m, isr);
 1181         KEY_FREESAV(&sav);
 1182         splx(s);
 1183         return err;
 1184 bad:
 1185         if (sav)
 1186                 KEY_FREESAV(&sav);
 1187         splx(s);
 1188         if (m)
 1189                 m_freem(m);
 1190         free(tc, M_XDATA);
 1191         crypto_freereq(crp);
 1192         return error;
 1193 }
 1194 
 1195 static struct xformsw ah_xformsw = {
 1196         XF_AH,          XFT_AUTH,       "IPsec AH",
 1197         ah_init,        ah_zeroize,     ah_input,       ah_output,
 1198 };
 1199 
 1200 static void
 1201 ah_attach(void)
 1202 {
 1203         xform_register(&ah_xformsw);
 1204 }
 1205 SYSINIT(ah_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ah_attach, NULL);

Cache object: 04fd0abb1725b101bf7e621832e33acb


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