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/6.1/sys/netipsec/xform_ah.c 157061 2006-03-23 23:24:33Z 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                 IPSEC_ASSERT(sav->tdb_authalgxform != NULL, ("null xform"));
  146                 /*XXX not right for null algorithm--does it matter??*/
  147                 authsize = AUTHSIZE(sav);
  148                 size = roundup(authsize, sizeof (u_int32_t)) + HDRSIZE(sav);
  149         } else {
  150                 /* default guess */
  151                 size = sizeof (struct ah) + sizeof (u_int32_t) + 16;
  152         }
  153         return size;
  154 }
  155 
  156 /*
  157  * NB: public for use by esp_init.
  158  */
  159 int
  160 ah_init0(struct secasvar *sav, struct xformsw *xsp, struct cryptoini *cria)
  161 {
  162         struct auth_hash *thash;
  163         int keylen;
  164 
  165         thash = ah_algorithm_lookup(sav->alg_auth);
  166         if (thash == NULL) {
  167                 DPRINTF(("%s: unsupported authentication algorithm %u\n",
  168                         __func__, sav->alg_auth));
  169                 return EINVAL;
  170         }
  171         /*
  172          * Verify the replay state block allocation is consistent with
  173          * the protocol type.  We check here so we can make assumptions
  174          * later during protocol processing.
  175          */
  176         /* NB: replay state is setup elsewhere (sigh) */
  177         if (((sav->flags&SADB_X_EXT_OLD) == 0) ^ (sav->replay != NULL)) {
  178                 DPRINTF(("%s: replay state block inconsistency, "
  179                         "%s algorithm %s replay state\n", __func__,
  180                         (sav->flags & SADB_X_EXT_OLD) ? "old" : "new",
  181                         sav->replay == NULL ? "without" : "with"));
  182                 return EINVAL;
  183         }
  184         if (sav->key_auth == NULL) {
  185                 DPRINTF(("%s: no authentication key for %s algorithm\n",
  186                         __func__, thash->name));
  187                 return EINVAL;
  188         }
  189         keylen = _KEYLEN(sav->key_auth);
  190         if (keylen != thash->keysize && thash->keysize != 0) {
  191                 DPRINTF(("%s: invalid keylength %d, algorithm %s requires "
  192                         "keysize %d\n", __func__,
  193                          keylen, thash->name, thash->keysize));
  194                 return EINVAL;
  195         }
  196 
  197         sav->tdb_xform = xsp;
  198         sav->tdb_authalgxform = thash;
  199 
  200         /* Initialize crypto session. */
  201         bzero(cria, sizeof (*cria));
  202         cria->cri_alg = sav->tdb_authalgxform->type;
  203         cria->cri_klen = _KEYBITS(sav->key_auth);
  204         cria->cri_key = _KEYBUF(sav->key_auth);
  205 
  206         return 0;
  207 }
  208 
  209 /*
  210  * ah_init() is called when an SPI is being set up.
  211  */
  212 static int
  213 ah_init(struct secasvar *sav, struct xformsw *xsp)
  214 {
  215         struct cryptoini cria;
  216         int error;
  217 
  218         error = ah_init0(sav, xsp, &cria);
  219         return error ? error :
  220                  crypto_newsession(&sav->tdb_cryptoid, &cria, crypto_support);
  221 }
  222 
  223 /*
  224  * Paranoia.
  225  *
  226  * NB: public for use by esp_zeroize (XXX).
  227  */
  228 int
  229 ah_zeroize(struct secasvar *sav)
  230 {
  231         int err;
  232 
  233         if (sav->key_auth)
  234                 bzero(_KEYBUF(sav->key_auth), _KEYLEN(sav->key_auth));
  235 
  236         err = crypto_freesession(sav->tdb_cryptoid);
  237         sav->tdb_cryptoid = 0;
  238         sav->tdb_authalgxform = NULL;
  239         sav->tdb_xform = NULL;
  240         return err;
  241 }
  242 
  243 /*
  244  * Massage IPv4/IPv6 headers for AH processing.
  245  */
  246 static int
  247 ah_massage_headers(struct mbuf **m0, int proto, int skip, int alg, int out)
  248 {
  249         struct mbuf *m = *m0;
  250         unsigned char *ptr;
  251         int off, count;
  252 
  253 #ifdef INET
  254         struct ip *ip;
  255 #endif /* INET */
  256 
  257 #ifdef INET6
  258         struct ip6_ext *ip6e;
  259         struct ip6_hdr ip6;
  260         int alloc, len, ad;
  261 #endif /* INET6 */
  262 
  263         switch (proto) {
  264 #ifdef INET
  265         case AF_INET:
  266                 /*
  267                  * This is the least painful way of dealing with IPv4 header
  268                  * and option processing -- just make sure they're in
  269                  * contiguous memory.
  270                  */
  271                 *m0 = m = m_pullup(m, skip);
  272                 if (m == NULL) {
  273                         DPRINTF(("%s: m_pullup failed\n", __func__));
  274                         return ENOBUFS;
  275                 }
  276 
  277                 /* Fix the IP header */
  278                 ip = mtod(m, struct ip *);
  279                 if (ah_cleartos)
  280                         ip->ip_tos = 0;
  281                 ip->ip_ttl = 0;
  282                 ip->ip_sum = 0;
  283 
  284                 /*
  285                  * On input, fix ip_len which has been byte-swapped
  286                  * at ip_input().
  287                  */
  288                 if (!out) {
  289                         ip->ip_len = htons(ip->ip_len + skip);
  290 
  291                         if (alg == CRYPTO_MD5_KPDK || alg == CRYPTO_SHA1_KPDK)
  292                                 ip->ip_off = htons(ip->ip_off & IP_DF);
  293                         else
  294                                 ip->ip_off = 0;
  295                 } else {
  296                         if (alg == CRYPTO_MD5_KPDK || alg == CRYPTO_SHA1_KPDK)
  297                                 ip->ip_off = htons(ntohs(ip->ip_off) & IP_DF);
  298                         else
  299                                 ip->ip_off = 0;
  300                 }
  301 
  302                 ptr = mtod(m, unsigned char *) + sizeof(struct ip);
  303 
  304                 /* IPv4 option processing */
  305                 for (off = sizeof(struct ip); off < skip;) {
  306                         if (ptr[off] == IPOPT_EOL || ptr[off] == IPOPT_NOP ||
  307                             off + 1 < skip)
  308                                 ;
  309                         else {
  310                                 DPRINTF(("%s: illegal IPv4 option length for "
  311                                         "option %d\n", __func__, ptr[off]));
  312 
  313                                 m_freem(m);
  314                                 return EINVAL;
  315                         }
  316 
  317                         switch (ptr[off]) {
  318                         case IPOPT_EOL:
  319                                 off = skip;  /* End the loop. */
  320                                 break;
  321 
  322                         case IPOPT_NOP:
  323                                 off++;
  324                                 break;
  325 
  326                         case IPOPT_SECURITY:    /* 0x82 */
  327                         case 0x85:      /* Extended security. */
  328                         case 0x86:      /* Commercial security. */
  329                         case 0x94:      /* Router alert */
  330                         case 0x95:      /* RFC1770 */
  331                                 /* Sanity check for option length. */
  332                                 if (ptr[off + 1] < 2) {
  333                                         DPRINTF(("%s: illegal IPv4 option "
  334                                                 "length for option %d\n",
  335                                                 __func__, ptr[off]));
  336 
  337                                         m_freem(m);
  338                                         return EINVAL;
  339                                 }
  340 
  341                                 off += ptr[off + 1];
  342                                 break;
  343 
  344                         case IPOPT_LSRR:
  345                         case IPOPT_SSRR:
  346                                 /* Sanity check for option length. */
  347                                 if (ptr[off + 1] < 2) {
  348                                         DPRINTF(("%s: illegal IPv4 option "
  349                                                 "length for option %d\n",
  350                                                 __func__, ptr[off]));
  351 
  352                                         m_freem(m);
  353                                         return EINVAL;
  354                                 }
  355 
  356                                 /*
  357                                  * On output, if we have either of the
  358                                  * source routing options, we should
  359                                  * swap the destination address of the
  360                                  * IP header with the last address
  361                                  * specified in the option, as that is
  362                                  * what the destination's IP header
  363                                  * will look like.
  364                                  */
  365                                 if (out)
  366                                         bcopy(ptr + off + ptr[off + 1] -
  367                                             sizeof(struct in_addr),
  368                                             &(ip->ip_dst), sizeof(struct in_addr));
  369 
  370                                 /* Fall through */
  371                         default:
  372                                 /* Sanity check for option length. */
  373                                 if (ptr[off + 1] < 2) {
  374                                         DPRINTF(("%s: illegal IPv4 option "
  375                                                 "length for option %d\n",
  376                                                 __func__, ptr[off]));
  377                                         m_freem(m);
  378                                         return EINVAL;
  379                                 }
  380 
  381                                 /* Zeroize all other options. */
  382                                 count = ptr[off + 1];
  383                                 bcopy(ipseczeroes, ptr, count);
  384                                 off += count;
  385                                 break;
  386                         }
  387 
  388                         /* Sanity check. */
  389                         if (off > skip) {
  390                                 DPRINTF(("%s: malformed IPv4 options header\n",
  391                                         __func__));
  392 
  393                                 m_freem(m);
  394                                 return EINVAL;
  395                         }
  396                 }
  397 
  398                 break;
  399 #endif /* INET */
  400 
  401 #ifdef INET6
  402         case AF_INET6:  /* Ugly... */
  403                 /* Copy and "cook" the IPv6 header. */
  404                 m_copydata(m, 0, sizeof(ip6), (caddr_t) &ip6);
  405 
  406                 /* We don't do IPv6 Jumbograms. */
  407                 if (ip6.ip6_plen == 0) {
  408                         DPRINTF(("%s: unsupported IPv6 jumbogram\n", __func__));
  409                         m_freem(m);
  410                         return EMSGSIZE;
  411                 }
  412 
  413                 ip6.ip6_flow = 0;
  414                 ip6.ip6_hlim = 0;
  415                 ip6.ip6_vfc &= ~IPV6_VERSION_MASK;
  416                 ip6.ip6_vfc |= IPV6_VERSION;
  417 
  418                 /* Scoped address handling. */
  419                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_src))
  420                         ip6.ip6_src.s6_addr16[1] = 0;
  421                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_dst))
  422                         ip6.ip6_dst.s6_addr16[1] = 0;
  423 
  424                 /* Done with IPv6 header. */
  425                 m_copyback(m, 0, sizeof(struct ip6_hdr), (caddr_t) &ip6);
  426 
  427                 /* Let's deal with the remaining headers (if any). */
  428                 if (skip - sizeof(struct ip6_hdr) > 0) {
  429                         if (m->m_len <= skip) {
  430                                 ptr = (unsigned char *) malloc(
  431                                     skip - sizeof(struct ip6_hdr),
  432                                     M_XDATA, M_NOWAIT);
  433                                 if (ptr == NULL) {
  434                                         DPRINTF(("%s: failed to allocate memory"
  435                                                 "for IPv6 headers\n",__func__));
  436                                         m_freem(m);
  437                                         return ENOBUFS;
  438                                 }
  439 
  440                                 /*
  441                                  * Copy all the protocol headers after
  442                                  * the IPv6 header.
  443                                  */
  444                                 m_copydata(m, sizeof(struct ip6_hdr),
  445                                     skip - sizeof(struct ip6_hdr), ptr);
  446                                 alloc = 1;
  447                         } else {
  448                                 /* No need to allocate memory. */
  449                                 ptr = mtod(m, unsigned char *) +
  450                                     sizeof(struct ip6_hdr);
  451                                 alloc = 0;
  452                         }
  453                 } else
  454                         break;
  455 
  456                 off = ip6.ip6_nxt & 0xff; /* Next header type. */
  457 
  458                 for (len = 0; len < skip - sizeof(struct ip6_hdr);)
  459                         switch (off) {
  460                         case IPPROTO_HOPOPTS:
  461                         case IPPROTO_DSTOPTS:
  462                                 ip6e = (struct ip6_ext *) (ptr + len);
  463 
  464                                 /*
  465                                  * Process the mutable/immutable
  466                                  * options -- borrows heavily from the
  467                                  * KAME code.
  468                                  */
  469                                 for (count = len + sizeof(struct ip6_ext);
  470                                      count < len + ((ip6e->ip6e_len + 1) << 3);) {
  471                                         if (ptr[count] == IP6OPT_PAD1) {
  472                                                 count++;
  473                                                 continue; /* Skip padding. */
  474                                         }
  475 
  476                                         /* Sanity check. */
  477                                         if (count > len +
  478                                             ((ip6e->ip6e_len + 1) << 3)) {
  479                                                 m_freem(m);
  480 
  481                                                 /* Free, if we allocated. */
  482                                                 if (alloc)
  483                                                         FREE(ptr, M_XDATA);
  484                                                 return EINVAL;
  485                                         }
  486 
  487                                         ad = ptr[count + 1];
  488 
  489                                         /* If mutable option, zeroize. */
  490                                         if (ptr[count] & IP6OPT_MUTABLE)
  491                                                 bcopy(ipseczeroes, ptr + count,
  492                                                     ptr[count + 1]);
  493 
  494                                         count += ad;
  495 
  496                                         /* Sanity check. */
  497                                         if (count >
  498                                             skip - sizeof(struct ip6_hdr)) {
  499                                                 m_freem(m);
  500 
  501                                                 /* Free, if we allocated. */
  502                                                 if (alloc)
  503                                                         FREE(ptr, M_XDATA);
  504                                                 return EINVAL;
  505                                         }
  506                                 }
  507 
  508                                 /* Advance. */
  509                                 len += ((ip6e->ip6e_len + 1) << 3);
  510                                 off = ip6e->ip6e_nxt;
  511                                 break;
  512 
  513                         case IPPROTO_ROUTING:
  514                                 /*
  515                                  * Always include routing headers in
  516                                  * computation.
  517                                  */
  518                                 ip6e = (struct ip6_ext *) (ptr + len);
  519                                 len += ((ip6e->ip6e_len + 1) << 3);
  520                                 off = ip6e->ip6e_nxt;
  521                                 break;
  522 
  523                         default:
  524                                 DPRINTF(("%s: unexpected IPv6 header type %d",
  525                                         __func__, off));
  526                                 if (alloc)
  527                                         FREE(ptr, M_XDATA);
  528                                 m_freem(m);
  529                                 return EINVAL;
  530                         }
  531 
  532                 /* Copyback and free, if we allocated. */
  533                 if (alloc) {
  534                         m_copyback(m, sizeof(struct ip6_hdr),
  535                             skip - sizeof(struct ip6_hdr), ptr);
  536                         free(ptr, M_XDATA);
  537                 }
  538 
  539                 break;
  540 #endif /* INET6 */
  541         }
  542 
  543         return 0;
  544 }
  545 
  546 /*
  547  * ah_input() gets called to verify that an input packet
  548  * passes authentication.
  549  */
  550 static int
  551 ah_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  552 {
  553         struct auth_hash *ahx;
  554         struct tdb_ident *tdbi;
  555         struct tdb_crypto *tc;
  556         struct m_tag *mtag;
  557         struct newah *ah;
  558         int hl, rplen, authsize;
  559 
  560         struct cryptodesc *crda;
  561         struct cryptop *crp;
  562 
  563         IPSEC_SPLASSERT_SOFTNET(__func__);
  564 
  565         IPSEC_ASSERT(sav != NULL, ("null SA"));
  566         IPSEC_ASSERT(sav->key_auth != NULL, ("null authentication key"));
  567         IPSEC_ASSERT(sav->tdb_authalgxform != NULL,
  568                 ("null authentication xform"));
  569 
  570         /* Figure out header size. */
  571         rplen = HDRSIZE(sav);
  572 
  573         /* XXX don't pullup, just copy header */
  574         IP6_EXTHDR_GET(ah, struct newah *, m, skip, rplen);
  575         if (ah == NULL) {
  576                 DPRINTF(("ah_input: cannot pullup header\n"));
  577                 ahstat.ahs_hdrops++;            /*XXX*/
  578                 m_freem(m);
  579                 return ENOBUFS;
  580         }
  581 
  582         /* Check replay window, if applicable. */
  583         if (sav->replay && !ipsec_chkreplay(ntohl(ah->ah_seq), sav)) {
  584                 ahstat.ahs_replay++;
  585                 DPRINTF(("%s: packet replay failure: %s\n", __func__,
  586                           ipsec_logsastr(sav)));
  587                 m_freem(m);
  588                 return ENOBUFS;
  589         }
  590 
  591         /* Verify AH header length. */
  592         hl = ah->ah_len * sizeof (u_int32_t);
  593         ahx = sav->tdb_authalgxform;
  594         authsize = AUTHSIZE(sav);
  595         if (hl != authsize + rplen - sizeof (struct ah)) {
  596                 DPRINTF(("%s: bad authenticator length %u (expecting %lu)"
  597                         " for packet in SA %s/%08lx\n", __func__,
  598                         hl, (u_long) (authsize + rplen - sizeof (struct ah)),
  599                         ipsec_address(&sav->sah->saidx.dst),
  600                         (u_long) ntohl(sav->spi)));
  601                 ahstat.ahs_badauthl++;
  602                 m_freem(m);
  603                 return EACCES;
  604         }
  605         ahstat.ahs_ibytes += m->m_pkthdr.len - skip - hl;
  606 
  607         /* Get crypto descriptors. */
  608         crp = crypto_getreq(1);
  609         if (crp == NULL) {
  610                 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
  611                 ahstat.ahs_crypto++;
  612                 m_freem(m);
  613                 return ENOBUFS;
  614         }
  615 
  616         crda = crp->crp_desc;
  617         IPSEC_ASSERT(crda != NULL, ("null crypto descriptor"));
  618 
  619         crda->crd_skip = 0;
  620         crda->crd_len = m->m_pkthdr.len;
  621         crda->crd_inject = skip + rplen;
  622 
  623         /* Authentication operation. */
  624         crda->crd_alg = ahx->type;
  625         crda->crd_key = _KEYBUF(sav->key_auth);
  626         crda->crd_klen = _KEYBITS(sav->key_auth);
  627 
  628         /* Find out if we've already done crypto. */
  629         for (mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, NULL);
  630              mtag != NULL;
  631              mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, mtag)) {
  632                 tdbi = (struct tdb_ident *) (mtag + 1);
  633                 if (tdbi->proto == sav->sah->saidx.proto &&
  634                     tdbi->spi == sav->spi &&
  635                     !bcmp(&tdbi->dst, &sav->sah->saidx.dst,
  636                           sizeof (union sockaddr_union)))
  637                         break;
  638         }
  639 
  640         /* Allocate IPsec-specific opaque crypto info. */
  641         if (mtag == NULL) {
  642                 tc = (struct tdb_crypto *) malloc(sizeof (struct tdb_crypto) +
  643                         skip + rplen + authsize, M_XDATA, M_NOWAIT|M_ZERO);
  644         } else {
  645                 /* Hash verification has already been done successfully. */
  646                 tc = (struct tdb_crypto *) malloc(sizeof (struct tdb_crypto),
  647                                                     M_XDATA, M_NOWAIT|M_ZERO);
  648         }
  649         if (tc == NULL) {
  650                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
  651                 ahstat.ahs_crypto++;
  652                 crypto_freereq(crp);
  653                 m_freem(m);
  654                 return ENOBUFS;
  655         }
  656 
  657         /* Only save information if crypto processing is needed. */
  658         if (mtag == NULL) {
  659                 int error;
  660 
  661                 /*
  662                  * Save the authenticator, the skipped portion of the packet,
  663                  * and the AH header.
  664                  */
  665                 m_copydata(m, 0, skip + rplen + authsize, (caddr_t)(tc+1));
  666 
  667                 /* Zeroize the authenticator on the packet. */
  668                 m_copyback(m, skip + rplen, authsize, ipseczeroes);
  669 
  670                 /* "Massage" the packet headers for crypto processing. */
  671                 error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
  672                     skip, ahx->type, 0);
  673                 if (error != 0) {
  674                         /* NB: mbuf is free'd by ah_massage_headers */
  675                         ahstat.ahs_hdrops++;
  676                         free(tc, M_XDATA);
  677                         crypto_freereq(crp);
  678                         return error;
  679                 }
  680         }
  681 
  682         /* Crypto operation descriptor. */
  683         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
  684         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
  685         crp->crp_buf = (caddr_t) m;
  686         crp->crp_callback = ah_input_cb;
  687         crp->crp_sid = sav->tdb_cryptoid;
  688         crp->crp_opaque = (caddr_t) tc;
  689 
  690         /* These are passed as-is to the callback. */
  691         tc->tc_spi = sav->spi;
  692         tc->tc_dst = sav->sah->saidx.dst;
  693         tc->tc_proto = sav->sah->saidx.proto;
  694         tc->tc_nxt = ah->ah_nxt;
  695         tc->tc_protoff = protoff;
  696         tc->tc_skip = skip;
  697         tc->tc_ptr = (caddr_t) mtag; /* Save the mtag we've identified. */
  698 
  699         if (mtag == NULL)
  700                 return crypto_dispatch(crp);
  701         else
  702                 return ah_input_cb(crp);
  703 }
  704 
  705 #ifdef INET6
  706 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do {              \
  707         if (saidx->dst.sa.sa_family == AF_INET6) {                           \
  708                 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
  709         } else {                                                             \
  710                 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
  711         }                                                                    \
  712 } while (0)
  713 #else
  714 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag)                   \
  715         (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
  716 #endif
  717 
  718 /*
  719  * AH input callback from the crypto driver.
  720  */
  721 static int
  722 ah_input_cb(struct cryptop *crp)
  723 {
  724         int rplen, error, skip, protoff;
  725         unsigned char calc[AH_ALEN_MAX];
  726         struct mbuf *m;
  727         struct cryptodesc *crd;
  728         struct auth_hash *ahx;
  729         struct tdb_crypto *tc;
  730         struct m_tag *mtag;
  731         struct secasvar *sav;
  732         struct secasindex *saidx;
  733         u_int8_t nxt;
  734         caddr_t ptr;
  735         int authsize;
  736 
  737         crd = crp->crp_desc;
  738 
  739         tc = (struct tdb_crypto *) crp->crp_opaque;
  740         IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!"));
  741         skip = tc->tc_skip;
  742         nxt = tc->tc_nxt;
  743         protoff = tc->tc_protoff;
  744         mtag = (struct m_tag *) tc->tc_ptr;
  745         m = (struct mbuf *) crp->crp_buf;
  746 
  747         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
  748         if (sav == NULL) {
  749                 ahstat.ahs_notdb++;
  750                 DPRINTF(("%s: SA expired while in crypto\n", __func__));
  751                 error = ENOBUFS;                /*XXX*/
  752                 goto bad;
  753         }
  754 
  755         saidx = &sav->sah->saidx;
  756         IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
  757                 saidx->dst.sa.sa_family == AF_INET6,
  758                 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
  759 
  760         ahx = (struct auth_hash *) sav->tdb_authalgxform;
  761 
  762         /* Check for crypto errors. */
  763         if (crp->crp_etype) {
  764                 if (sav->tdb_cryptoid != 0)
  765                         sav->tdb_cryptoid = crp->crp_sid;
  766 
  767                 if (crp->crp_etype == EAGAIN)
  768                         return crypto_dispatch(crp);
  769 
  770                 ahstat.ahs_noxform++;
  771                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  772                 error = crp->crp_etype;
  773                 goto bad;
  774         } else {
  775                 ahstat.ahs_hist[sav->alg_auth]++;
  776                 crypto_freereq(crp);            /* No longer needed. */
  777                 crp = NULL;
  778         }
  779 
  780         /* Shouldn't happen... */
  781         if (m == NULL) {
  782                 ahstat.ahs_crypto++;
  783                 DPRINTF(("%s: bogus returned buffer from crypto\n", __func__));
  784                 error = EINVAL;
  785                 goto bad;
  786         }
  787 
  788         /* Figure out header size. */
  789         rplen = HDRSIZE(sav);
  790         authsize = AUTHSIZE(sav);
  791 
  792         /* Copy authenticator off the packet. */
  793         m_copydata(m, skip + rplen, authsize, calc);
  794 
  795         /*
  796          * If we have an mtag, we don't need to verify the authenticator --
  797          * it has been verified by an IPsec-aware NIC.
  798          */
  799         if (mtag == NULL) {
  800                 ptr = (caddr_t) (tc + 1);
  801 
  802                 /* Verify authenticator. */
  803                 if (bcmp(ptr + skip + rplen, calc, authsize)) {
  804                         DPRINTF(("%s: authentication hash mismatch for packet "
  805                             "in SA %s/%08lx\n", __func__,
  806                             ipsec_address(&saidx->dst),
  807                             (u_long) ntohl(sav->spi)));
  808                         ahstat.ahs_badauth++;
  809                         error = EACCES;
  810                         goto bad;
  811                 }
  812 
  813                 /* Fix the Next Protocol field. */
  814                 ((u_int8_t *) ptr)[protoff] = nxt;
  815 
  816                 /* Copyback the saved (uncooked) network headers. */
  817                 m_copyback(m, 0, skip, ptr);
  818         } else {
  819                 /* Fix the Next Protocol field. */
  820                 m_copyback(m, protoff, sizeof(u_int8_t), &nxt);
  821         }
  822 
  823         free(tc, M_XDATA), tc = NULL;                   /* No longer needed */
  824 
  825         /*
  826          * Header is now authenticated.
  827          */
  828         m->m_flags |= M_AUTHIPHDR|M_AUTHIPDGM;
  829 
  830         /*
  831          * Update replay sequence number, if appropriate.
  832          */
  833         if (sav->replay) {
  834                 u_int32_t seq;
  835 
  836                 m_copydata(m, skip + offsetof(struct newah, ah_seq),
  837                            sizeof (seq), (caddr_t) &seq);
  838                 if (ipsec_updatereplay(ntohl(seq), sav)) {
  839                         ahstat.ahs_replay++;
  840                         error = ENOBUFS;                        /*XXX as above*/
  841                         goto bad;
  842                 }
  843         }
  844 
  845         /*
  846          * Remove the AH header and authenticator from the mbuf.
  847          */
  848         error = m_striphdr(m, skip, rplen + authsize);
  849         if (error) {
  850                 DPRINTF(("%s: mangled mbuf chain for SA %s/%08lx\n", __func__,
  851                     ipsec_address(&saidx->dst), (u_long) ntohl(sav->spi)));
  852 
  853                 ahstat.ahs_hdrops++;
  854                 goto bad;
  855         }
  856 
  857         IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag);
  858 
  859         KEY_FREESAV(&sav);
  860 
  861         return error;
  862 bad:
  863         if (sav)
  864                 KEY_FREESAV(&sav);
  865         if (m != NULL)
  866                 m_freem(m);
  867         if (tc != NULL)
  868                 free(tc, M_XDATA);
  869         if (crp != NULL)
  870                 crypto_freereq(crp);
  871         return error;
  872 }
  873 
  874 /*
  875  * AH output routine, called by ipsec[46]_process_packet().
  876  */
  877 static int
  878 ah_output(
  879         struct mbuf *m,
  880         struct ipsecrequest *isr,
  881         struct mbuf **mp,
  882         int skip,
  883         int protoff)
  884 {
  885         struct secasvar *sav;
  886         struct auth_hash *ahx;
  887         struct cryptodesc *crda;
  888         struct tdb_crypto *tc;
  889         struct mbuf *mi;
  890         struct cryptop *crp;
  891         u_int16_t iplen;
  892         int error, rplen, authsize, maxpacketsize, roff;
  893         u_int8_t prot;
  894         struct newah *ah;
  895 
  896         IPSEC_SPLASSERT_SOFTNET(__func__);
  897 
  898         sav = isr->sav;
  899         IPSEC_ASSERT(sav != NULL, ("null SA"));
  900         ahx = sav->tdb_authalgxform;
  901         IPSEC_ASSERT(ahx != NULL, ("null authentication xform"));
  902 
  903         ahstat.ahs_output++;
  904 
  905         /* Figure out header size. */
  906         rplen = HDRSIZE(sav);
  907 
  908         /* Check for maximum packet size violations. */
  909         switch (sav->sah->saidx.dst.sa.sa_family) {
  910 #ifdef INET
  911         case AF_INET:
  912                 maxpacketsize = IP_MAXPACKET;
  913                 break;
  914 #endif /* INET */
  915 #ifdef INET6
  916         case AF_INET6:
  917                 maxpacketsize = IPV6_MAXPACKET;
  918                 break;
  919 #endif /* INET6 */
  920         default:
  921                 DPRINTF(("%s: unknown/unsupported protocol family %u, "
  922                     "SA %s/%08lx\n", __func__,
  923                     sav->sah->saidx.dst.sa.sa_family,
  924                     ipsec_address(&sav->sah->saidx.dst),
  925                     (u_long) ntohl(sav->spi)));
  926                 ahstat.ahs_nopf++;
  927                 error = EPFNOSUPPORT;
  928                 goto bad;
  929         }
  930         authsize = AUTHSIZE(sav);
  931         if (rplen + authsize + m->m_pkthdr.len > maxpacketsize) {
  932                 DPRINTF(("%s: packet in SA %s/%08lx got too big "
  933                     "(len %u, max len %u)\n", __func__,
  934                     ipsec_address(&sav->sah->saidx.dst),
  935                     (u_long) ntohl(sav->spi),
  936                     rplen + authsize + m->m_pkthdr.len, maxpacketsize));
  937                 ahstat.ahs_toobig++;
  938                 error = EMSGSIZE;
  939                 goto bad;
  940         }
  941 
  942         /* Update the counters. */
  943         ahstat.ahs_obytes += m->m_pkthdr.len - skip;
  944 
  945         m = m_unshare(m, M_NOWAIT);
  946         if (m == NULL) {
  947                 DPRINTF(("%s: cannot clone mbuf chain, SA %s/%08lx\n", __func__,
  948                     ipsec_address(&sav->sah->saidx.dst),
  949                     (u_long) ntohl(sav->spi)));
  950                 ahstat.ahs_hdrops++;
  951                 error = ENOBUFS;
  952                 goto bad;
  953         }
  954 
  955         /* Inject AH header. */
  956         mi = m_makespace(m, skip, rplen + authsize, &roff);
  957         if (mi == NULL) {
  958                 DPRINTF(("%s: failed to inject %u byte AH header for SA "
  959                     "%s/%08lx\n", __func__,
  960                     rplen + authsize,
  961                     ipsec_address(&sav->sah->saidx.dst),
  962                     (u_long) ntohl(sav->spi)));
  963                 ahstat.ahs_hdrops++;            /*XXX differs from openbsd */
  964                 error = ENOBUFS;
  965                 goto bad;
  966         }
  967 
  968         /*
  969          * The AH header is guaranteed by m_makespace() to be in
  970          * contiguous memory, at roff bytes offset into the returned mbuf.
  971          */
  972         ah = (struct newah *)(mtod(mi, caddr_t) + roff);
  973 
  974         /* Initialize the AH header. */
  975         m_copydata(m, protoff, sizeof(u_int8_t), (caddr_t) &ah->ah_nxt);
  976         ah->ah_len = (rplen + authsize - sizeof(struct ah)) / sizeof(u_int32_t);
  977         ah->ah_reserve = 0;
  978         ah->ah_spi = sav->spi;
  979 
  980         /* Zeroize authenticator. */
  981         m_copyback(m, skip + rplen, authsize, ipseczeroes);
  982 
  983         /* Insert packet replay counter, as requested.  */
  984         if (sav->replay) {
  985                 if (sav->replay->count == ~0 &&
  986                     (sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
  987                         DPRINTF(("%s: replay counter wrapped for SA %s/%08lx\n",
  988                                 __func__,
  989                                 ipsec_address(&sav->sah->saidx.dst),
  990                                 (u_long) ntohl(sav->spi)));
  991                         ahstat.ahs_wrap++;
  992                         error = EINVAL;
  993                         goto bad;
  994                 }
  995                 sav->replay->count++;
  996                 ah->ah_seq = htonl(sav->replay->count);
  997         }
  998 
  999         /* Get crypto descriptors. */
 1000         crp = crypto_getreq(1);
 1001         if (crp == NULL) {
 1002                 DPRINTF(("%s: failed to acquire crypto descriptors\n",
 1003                         __func__));
 1004                 ahstat.ahs_crypto++;
 1005                 error = ENOBUFS;
 1006                 goto bad;
 1007         }
 1008 
 1009         crda = crp->crp_desc;
 1010 
 1011         crda->crd_skip = 0;
 1012         crda->crd_inject = skip + rplen;
 1013         crda->crd_len = m->m_pkthdr.len;
 1014 
 1015         /* Authentication operation. */
 1016         crda->crd_alg = ahx->type;
 1017         crda->crd_key = _KEYBUF(sav->key_auth);
 1018         crda->crd_klen = _KEYBITS(sav->key_auth);
 1019 
 1020         /* Allocate IPsec-specific opaque crypto info. */
 1021         tc = (struct tdb_crypto *) malloc(
 1022                 sizeof(struct tdb_crypto) + skip, M_XDATA, M_NOWAIT|M_ZERO);
 1023         if (tc == NULL) {
 1024                 crypto_freereq(crp);
 1025                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
 1026                 ahstat.ahs_crypto++;
 1027                 error = ENOBUFS;
 1028                 goto bad;
 1029         }
 1030 
 1031         /* Save the skipped portion of the packet. */
 1032         m_copydata(m, 0, skip, (caddr_t) (tc + 1));
 1033 
 1034         /*
 1035          * Fix IP header length on the header used for
 1036          * authentication. We don't need to fix the original
 1037          * header length as it will be fixed by our caller.
 1038          */
 1039         switch (sav->sah->saidx.dst.sa.sa_family) {
 1040 #ifdef INET
 1041         case AF_INET:
 1042                 bcopy(((caddr_t)(tc + 1)) +
 1043                     offsetof(struct ip, ip_len),
 1044                     (caddr_t) &iplen, sizeof(u_int16_t));
 1045                 iplen = htons(ntohs(iplen) + rplen + authsize);
 1046                 m_copyback(m, offsetof(struct ip, ip_len),
 1047                     sizeof(u_int16_t), (caddr_t) &iplen);
 1048                 break;
 1049 #endif /* INET */
 1050 
 1051 #ifdef INET6
 1052         case AF_INET6:
 1053                 bcopy(((caddr_t)(tc + 1)) +
 1054                     offsetof(struct ip6_hdr, ip6_plen),
 1055                     (caddr_t) &iplen, sizeof(u_int16_t));
 1056                 iplen = htons(ntohs(iplen) + rplen + authsize);
 1057                 m_copyback(m, offsetof(struct ip6_hdr, ip6_plen),
 1058                     sizeof(u_int16_t), (caddr_t) &iplen);
 1059                 break;
 1060 #endif /* INET6 */
 1061         }
 1062 
 1063         /* Fix the Next Header field in saved header. */
 1064         ((u_int8_t *) (tc + 1))[protoff] = IPPROTO_AH;
 1065 
 1066         /* Update the Next Protocol field in the IP header. */
 1067         prot = IPPROTO_AH;
 1068         m_copyback(m, protoff, sizeof(u_int8_t), (caddr_t) &prot);
 1069 
 1070         /* "Massage" the packet headers for crypto processing. */
 1071         error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
 1072                         skip, ahx->type, 1);
 1073         if (error != 0) {
 1074                 m = NULL;       /* mbuf was free'd by ah_massage_headers. */
 1075                 free(tc, M_XDATA);
 1076                 crypto_freereq(crp);
 1077                 goto bad;
 1078         }
 1079 
 1080         /* Crypto operation descriptor. */
 1081         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
 1082         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
 1083         crp->crp_buf = (caddr_t) m;
 1084         crp->crp_callback = ah_output_cb;
 1085         crp->crp_sid = sav->tdb_cryptoid;
 1086         crp->crp_opaque = (caddr_t) tc;
 1087 
 1088         /* These are passed as-is to the callback. */
 1089         tc->tc_isr = isr;
 1090         tc->tc_spi = sav->spi;
 1091         tc->tc_dst = sav->sah->saidx.dst;
 1092         tc->tc_proto = sav->sah->saidx.proto;
 1093         tc->tc_skip = skip;
 1094         tc->tc_protoff = protoff;
 1095 
 1096         return crypto_dispatch(crp);
 1097 bad:
 1098         if (m)
 1099                 m_freem(m);
 1100         return (error);
 1101 }
 1102 
 1103 /*
 1104  * AH output callback from the crypto driver.
 1105  */
 1106 static int
 1107 ah_output_cb(struct cryptop *crp)
 1108 {
 1109         int skip, protoff, error;
 1110         struct tdb_crypto *tc;
 1111         struct ipsecrequest *isr;
 1112         struct secasvar *sav;
 1113         struct mbuf *m;
 1114         caddr_t ptr;
 1115         int err;
 1116 
 1117         tc = (struct tdb_crypto *) crp->crp_opaque;
 1118         IPSEC_ASSERT(tc != NULL, ("null opaque data area!"));
 1119         skip = tc->tc_skip;
 1120         protoff = tc->tc_protoff;
 1121         ptr = (caddr_t) (tc + 1);
 1122         m = (struct mbuf *) crp->crp_buf;
 1123 
 1124         isr = tc->tc_isr;
 1125         IPSECREQUEST_LOCK(isr);
 1126         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
 1127         if (sav == NULL) {
 1128                 ahstat.ahs_notdb++;
 1129                 DPRINTF(("%s: SA expired while in crypto\n", __func__));
 1130                 error = ENOBUFS;                /*XXX*/
 1131                 goto bad;
 1132         }
 1133         IPSEC_ASSERT(isr->sav == sav, ("SA changed\n"));
 1134 
 1135         /* Check for crypto errors. */
 1136         if (crp->crp_etype) {
 1137                 if (sav->tdb_cryptoid != 0)
 1138                         sav->tdb_cryptoid = crp->crp_sid;
 1139 
 1140                 if (crp->crp_etype == EAGAIN) {
 1141                         KEY_FREESAV(&sav);
 1142                         IPSECREQUEST_UNLOCK(isr);
 1143                         return crypto_dispatch(crp);
 1144                 }
 1145 
 1146                 ahstat.ahs_noxform++;
 1147                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
 1148                 error = crp->crp_etype;
 1149                 goto bad;
 1150         }
 1151 
 1152         /* Shouldn't happen... */
 1153         if (m == NULL) {
 1154                 ahstat.ahs_crypto++;
 1155                 DPRINTF(("%s: bogus returned buffer from crypto\n", __func__));
 1156                 error = EINVAL;
 1157                 goto bad;
 1158         }
 1159         ahstat.ahs_hist[sav->alg_auth]++;
 1160 
 1161         /*
 1162          * Copy original headers (with the new protocol number) back
 1163          * in place.
 1164          */
 1165         m_copyback(m, 0, skip, ptr);
 1166 
 1167         /* No longer needed. */
 1168         free(tc, M_XDATA);
 1169         crypto_freereq(crp);
 1170 
 1171         /* NB: m is reclaimed by ipsec_process_done. */
 1172         err = ipsec_process_done(m, isr);
 1173         KEY_FREESAV(&sav);
 1174         IPSECREQUEST_UNLOCK(isr);
 1175 
 1176         return err;
 1177 bad:
 1178         if (sav)
 1179                 KEY_FREESAV(&sav);
 1180         IPSECREQUEST_UNLOCK(isr);
 1181         if (m)
 1182                 m_freem(m);
 1183         free(tc, M_XDATA);
 1184         crypto_freereq(crp);
 1185         return error;
 1186 }
 1187 
 1188 static struct xformsw ah_xformsw = {
 1189         XF_AH,          XFT_AUTH,       "IPsec AH",
 1190         ah_init,        ah_zeroize,     ah_input,       ah_output,
 1191 };
 1192 
 1193 static void
 1194 ah_attach(void)
 1195 {
 1196         xform_register(&ah_xformsw);
 1197 }
 1198 SYSINIT(ah_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ah_attach, NULL);

Cache object: e5711a4e16874dd93f747b45adbb3ef5


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