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

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    1 /*      $FreeBSD: releng/12.0/sys/netipsec/xform_ah.c 336439 2018-07-18 00:56:25Z cem $ */
    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/lock.h>
   49 #include <sys/mutex.h>
   50 #include <sys/sysctl.h>
   51 
   52 #include <net/if.h>
   53 #include <net/vnet.h>
   54 
   55 #include <netinet/in.h>
   56 #include <netinet/in_systm.h>
   57 #include <netinet/ip.h>
   58 #include <netinet/ip_ecn.h>
   59 #include <netinet/ip6.h>
   60 
   61 #include <netipsec/ipsec.h>
   62 #include <netipsec/ah.h>
   63 #include <netipsec/ah_var.h>
   64 #include <netipsec/xform.h>
   65 
   66 #ifdef INET6
   67 #include <netinet6/ip6_var.h>
   68 #include <netipsec/ipsec6.h>
   69 #include <netinet6/ip6_ecn.h>
   70 #endif
   71 
   72 #include <netipsec/key.h>
   73 #include <netipsec/key_debug.h>
   74 
   75 #include <opencrypto/cryptodev.h>
   76 
   77 /*
   78  * Return header size in bytes.  The old protocol did not support
   79  * the replay counter; the new protocol always includes the counter.
   80  */
   81 #define HDRSIZE(sav) \
   82         (((sav)->flags & SADB_X_EXT_OLD) ? \
   83                 sizeof (struct ah) : sizeof (struct ah) + sizeof (u_int32_t))
   84 /* 
   85  * Return authenticator size in bytes, based on a field in the
   86  * algorithm descriptor.
   87  */
   88 #define AUTHSIZE(sav)   ((sav->flags & SADB_X_EXT_OLD) ? 16 :   \
   89                          xform_ah_authsize((sav)->tdb_authalgxform))
   90 
   91 VNET_DEFINE(int, ah_enable) = 1;        /* control flow of packets with AH */
   92 VNET_DEFINE(int, ah_cleartos) = 1;      /* clear ip_tos when doing AH calc */
   93 VNET_PCPUSTAT_DEFINE(struct ahstat, ahstat);
   94 VNET_PCPUSTAT_SYSINIT(ahstat);
   95 
   96 #ifdef VIMAGE
   97 VNET_PCPUSTAT_SYSUNINIT(ahstat);
   98 #endif /* VIMAGE */
   99 
  100 #ifdef INET
  101 SYSCTL_DECL(_net_inet_ah);
  102 SYSCTL_INT(_net_inet_ah, OID_AUTO, ah_enable,
  103         CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ah_enable), 0, "");
  104 SYSCTL_INT(_net_inet_ah, OID_AUTO, ah_cleartos,
  105         CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ah_cleartos), 0, "");
  106 SYSCTL_VNET_PCPUSTAT(_net_inet_ah, IPSECCTL_STATS, stats, struct ahstat,
  107     ahstat, "AH statistics (struct ahstat, netipsec/ah_var.h)");
  108 #endif
  109 
  110 static unsigned char ipseczeroes[256];  /* larger than an ip6 extension hdr */
  111 
  112 static int ah_input_cb(struct cryptop*);
  113 static int ah_output_cb(struct cryptop*);
  114 
  115 int
  116 xform_ah_authsize(const struct auth_hash *esph)
  117 {
  118         int alen;
  119 
  120         if (esph == NULL)
  121                 return 0;
  122 
  123         switch (esph->type) {
  124         case CRYPTO_SHA2_256_HMAC:
  125         case CRYPTO_SHA2_384_HMAC:
  126         case CRYPTO_SHA2_512_HMAC:
  127                 alen = esph->hashsize / 2;      /* RFC4868 2.3 */
  128                 break;
  129 
  130         case CRYPTO_AES_128_NIST_GMAC:
  131         case CRYPTO_AES_192_NIST_GMAC:
  132         case CRYPTO_AES_256_NIST_GMAC:
  133                 alen = esph->hashsize;
  134                 break;
  135 
  136         default:
  137                 alen = AH_HMAC_HASHLEN;
  138                 break;
  139         }
  140 
  141         return alen;
  142 }
  143 
  144 size_t
  145 ah_hdrsiz(struct secasvar *sav)
  146 {
  147         size_t size;
  148 
  149         if (sav != NULL) {
  150                 int authsize, rplen, align;
  151 
  152                 IPSEC_ASSERT(sav->tdb_authalgxform != NULL, ("null xform"));
  153                 /*XXX not right for null algorithm--does it matter??*/
  154 
  155                 /* RFC4302: use the correct alignment. */
  156                 align = sizeof(uint32_t);
  157 #ifdef INET6
  158                 if (sav->sah->saidx.dst.sa.sa_family == AF_INET6) {
  159                         align = sizeof(uint64_t);
  160                 }
  161 #endif
  162                 rplen = HDRSIZE(sav);
  163                 authsize = AUTHSIZE(sav);
  164                 size = roundup(rplen + authsize, align);
  165         } else {
  166                 /* default guess */
  167                 size = sizeof (struct ah) + sizeof (u_int32_t) + 16;
  168         }
  169         return size;
  170 }
  171 
  172 /*
  173  * NB: public for use by esp_init.
  174  */
  175 int
  176 ah_init0(struct secasvar *sav, struct xformsw *xsp, struct cryptoini *cria)
  177 {
  178         const struct auth_hash *thash;
  179         int keylen;
  180 
  181         thash = auth_algorithm_lookup(sav->alg_auth);
  182         if (thash == NULL) {
  183                 DPRINTF(("%s: unsupported authentication algorithm %u\n",
  184                         __func__, sav->alg_auth));
  185                 return EINVAL;
  186         }
  187         /*
  188          * Verify the replay state block allocation is consistent with
  189          * the protocol type.  We check here so we can make assumptions
  190          * later during protocol processing.
  191          */
  192         /* NB: replay state is setup elsewhere (sigh) */
  193         if (((sav->flags&SADB_X_EXT_OLD) == 0) ^ (sav->replay != NULL)) {
  194                 DPRINTF(("%s: replay state block inconsistency, "
  195                         "%s algorithm %s replay state\n", __func__,
  196                         (sav->flags & SADB_X_EXT_OLD) ? "old" : "new",
  197                         sav->replay == NULL ? "without" : "with"));
  198                 return EINVAL;
  199         }
  200         if (sav->key_auth == NULL) {
  201                 DPRINTF(("%s: no authentication key for %s algorithm\n",
  202                         __func__, thash->name));
  203                 return EINVAL;
  204         }
  205         keylen = _KEYLEN(sav->key_auth);
  206         if (keylen > thash->keysize && thash->keysize != 0) {
  207                 DPRINTF(("%s: invalid keylength %d, algorithm %s requires "
  208                         "keysize less than %d\n", __func__,
  209                          keylen, thash->name, thash->keysize));
  210                 return EINVAL;
  211         }
  212 
  213         sav->tdb_xform = xsp;
  214         sav->tdb_authalgxform = thash;
  215 
  216         /* Initialize crypto session. */
  217         bzero(cria, sizeof (*cria));
  218         cria->cri_alg = sav->tdb_authalgxform->type;
  219         cria->cri_klen = _KEYBITS(sav->key_auth);
  220         cria->cri_key = sav->key_auth->key_data;
  221         cria->cri_mlen = AUTHSIZE(sav);
  222 
  223         return 0;
  224 }
  225 
  226 /*
  227  * ah_init() is called when an SPI is being set up.
  228  */
  229 static int
  230 ah_init(struct secasvar *sav, struct xformsw *xsp)
  231 {
  232         struct cryptoini cria;
  233         int error;
  234 
  235         error = ah_init0(sav, xsp, &cria);
  236         return error ? error :
  237                  crypto_newsession(&sav->tdb_cryptoid, &cria, V_crypto_support);
  238 }
  239 
  240 /*
  241  * Paranoia.
  242  *
  243  * NB: public for use by esp_zeroize (XXX).
  244  */
  245 int
  246 ah_zeroize(struct secasvar *sav)
  247 {
  248 
  249         if (sav->key_auth)
  250                 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth));
  251 
  252         crypto_freesession(sav->tdb_cryptoid);
  253         sav->tdb_cryptoid = NULL;
  254         sav->tdb_authalgxform = NULL;
  255         sav->tdb_xform = NULL;
  256         return 0;
  257 }
  258 
  259 /*
  260  * Massage IPv4/IPv6 headers for AH processing.
  261  */
  262 static int
  263 ah_massage_headers(struct mbuf **m0, int proto, int skip, int alg, int out)
  264 {
  265         struct mbuf *m = *m0;
  266         unsigned char *ptr;
  267         int off, count;
  268 
  269 #ifdef INET
  270         struct ip *ip;
  271 #endif /* INET */
  272 
  273 #ifdef INET6
  274         struct ip6_ext *ip6e;
  275         struct ip6_hdr ip6;
  276         int ad, alloc, nxt, noff;
  277 #endif /* INET6 */
  278 
  279         switch (proto) {
  280 #ifdef INET
  281         case AF_INET:
  282                 /*
  283                  * This is the least painful way of dealing with IPv4 header
  284                  * and option processing -- just make sure they're in
  285                  * contiguous memory.
  286                  */
  287                 *m0 = m = m_pullup(m, skip);
  288                 if (m == NULL) {
  289                         DPRINTF(("%s: m_pullup failed\n", __func__));
  290                         return ENOBUFS;
  291                 }
  292 
  293                 /* Fix the IP header */
  294                 ip = mtod(m, struct ip *);
  295                 if (V_ah_cleartos)
  296                         ip->ip_tos = 0;
  297                 ip->ip_ttl = 0;
  298                 ip->ip_sum = 0;
  299 
  300                 if (alg == CRYPTO_MD5_KPDK || alg == CRYPTO_SHA1_KPDK)
  301                         ip->ip_off &= htons(IP_DF);
  302                 else
  303                         ip->ip_off = htons(0);
  304 
  305                 ptr = mtod(m, unsigned char *);
  306 
  307                 /* IPv4 option processing */
  308                 for (off = sizeof(struct ip); off < skip;) {
  309                         if (ptr[off] == IPOPT_EOL || ptr[off] == IPOPT_NOP ||
  310                             off + 1 < skip)
  311                                 ;
  312                         else {
  313                                 DPRINTF(("%s: illegal IPv4 option length for "
  314                                         "option %d\n", __func__, ptr[off]));
  315 
  316                                 m_freem(m);
  317                                 return EINVAL;
  318                         }
  319 
  320                         switch (ptr[off]) {
  321                         case IPOPT_EOL:
  322                                 off = skip;  /* End the loop. */
  323                                 break;
  324 
  325                         case IPOPT_NOP:
  326                                 off++;
  327                                 break;
  328 
  329                         case IPOPT_SECURITY:    /* 0x82 */
  330                         case 0x85:      /* Extended security. */
  331                         case 0x86:      /* Commercial security. */
  332                         case 0x94:      /* Router alert */
  333                         case 0x95:      /* RFC1770 */
  334                                 /* Sanity check for option length. */
  335                                 if (ptr[off + 1] < 2) {
  336                                         DPRINTF(("%s: illegal IPv4 option "
  337                                                 "length for option %d\n",
  338                                                 __func__, ptr[off]));
  339 
  340                                         m_freem(m);
  341                                         return EINVAL;
  342                                 }
  343 
  344                                 off += ptr[off + 1];
  345                                 break;
  346 
  347                         case IPOPT_LSRR:
  348                         case IPOPT_SSRR:
  349                                 /* Sanity check for option length. */
  350                                 if (ptr[off + 1] < 2) {
  351                                         DPRINTF(("%s: illegal IPv4 option "
  352                                                 "length for option %d\n",
  353                                                 __func__, ptr[off]));
  354 
  355                                         m_freem(m);
  356                                         return EINVAL;
  357                                 }
  358 
  359                                 /*
  360                                  * On output, if we have either of the
  361                                  * source routing options, we should
  362                                  * swap the destination address of the
  363                                  * IP header with the last address
  364                                  * specified in the option, as that is
  365                                  * what the destination's IP header
  366                                  * will look like.
  367                                  */
  368                                 if (out)
  369                                         bcopy(ptr + off + ptr[off + 1] -
  370                                             sizeof(struct in_addr),
  371                                             &(ip->ip_dst), sizeof(struct in_addr));
  372 
  373                                 /* Fall through */
  374                         default:
  375                                 /* Sanity check for option length. */
  376                                 if (ptr[off + 1] < 2) {
  377                                         DPRINTF(("%s: illegal IPv4 option "
  378                                                 "length for option %d\n",
  379                                                 __func__, ptr[off]));
  380                                         m_freem(m);
  381                                         return EINVAL;
  382                                 }
  383 
  384                                 /* Zeroize all other options. */
  385                                 count = ptr[off + 1];
  386                                 bcopy(ipseczeroes, ptr + off, count);
  387                                 off += count;
  388                                 break;
  389                         }
  390 
  391                         /* Sanity check. */
  392                         if (off > skip) {
  393                                 DPRINTF(("%s: malformed IPv4 options header\n",
  394                                         __func__));
  395 
  396                                 m_freem(m);
  397                                 return EINVAL;
  398                         }
  399                 }
  400 
  401                 break;
  402 #endif /* INET */
  403 
  404 #ifdef INET6
  405         case AF_INET6:  /* Ugly... */
  406                 /* Copy and "cook" the IPv6 header. */
  407                 m_copydata(m, 0, sizeof(ip6), (caddr_t) &ip6);
  408 
  409                 /* We don't do IPv6 Jumbograms. */
  410                 if (ip6.ip6_plen == 0) {
  411                         DPRINTF(("%s: unsupported IPv6 jumbogram\n", __func__));
  412                         m_freem(m);
  413                         return EMSGSIZE;
  414                 }
  415 
  416                 ip6.ip6_flow = 0;
  417                 ip6.ip6_hlim = 0;
  418                 ip6.ip6_vfc &= ~IPV6_VERSION_MASK;
  419                 ip6.ip6_vfc |= IPV6_VERSION;
  420 
  421                 /* Scoped address handling. */
  422                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_src))
  423                         ip6.ip6_src.s6_addr16[1] = 0;
  424                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_dst))
  425                         ip6.ip6_dst.s6_addr16[1] = 0;
  426 
  427                 /* Done with IPv6 header. */
  428                 m_copyback(m, 0, sizeof(struct ip6_hdr), (caddr_t) &ip6);
  429 
  430                 /* Let's deal with the remaining headers (if any). */
  431                 if (skip - sizeof(struct ip6_hdr) > 0) {
  432                         if (m->m_len <= skip) {
  433                                 ptr = (unsigned char *) malloc(
  434                                     skip - sizeof(struct ip6_hdr),
  435                                     M_XDATA, M_NOWAIT);
  436                                 if (ptr == NULL) {
  437                                         DPRINTF(("%s: failed to allocate memory"
  438                                                 "for IPv6 headers\n",__func__));
  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                 nxt = ip6.ip6_nxt & 0xff; /* Next header type. */
  460 
  461                 for (off = 0; off < skip - sizeof(struct ip6_hdr);)
  462                         switch (nxt) {
  463                         case IPPROTO_HOPOPTS:
  464                         case IPPROTO_DSTOPTS:
  465                                 ip6e = (struct ip6_ext *)(ptr + off);
  466                                 noff = off + ((ip6e->ip6e_len + 1) << 3);
  467 
  468                                 /* Sanity check. */
  469                                 if (noff > skip - sizeof(struct ip6_hdr))
  470                                         goto error6;
  471 
  472                                 /*
  473                                  * Zero out mutable options.
  474                                  */
  475                                 for (count = off + sizeof(struct ip6_ext);
  476                                      count < noff;) {
  477                                         if (ptr[count] == IP6OPT_PAD1) {
  478                                                 count++;
  479                                                 continue; /* Skip padding. */
  480                                         }
  481 
  482                                         ad = ptr[count + 1] + 2;
  483                                         if (count + ad > noff)
  484                                                 goto error6;
  485 
  486                                         if (ptr[count] & IP6OPT_MUTABLE)
  487                                                 memset(ptr + count, 0, ad);
  488                                         count += ad;
  489                                 }
  490 
  491                                 if (count != noff)
  492                                         goto error6;
  493 
  494                                 /* Advance. */
  495                                 off += ((ip6e->ip6e_len + 1) << 3);
  496                                 nxt = ip6e->ip6e_nxt;
  497                                 break;
  498 
  499                         case IPPROTO_ROUTING:
  500                                 /*
  501                                  * Always include routing headers in
  502                                  * computation.
  503                                  */
  504                                 ip6e = (struct ip6_ext *) (ptr + off);
  505                                 off += ((ip6e->ip6e_len + 1) << 3);
  506                                 nxt = ip6e->ip6e_nxt;
  507                                 break;
  508 
  509                         default:
  510                                 DPRINTF(("%s: unexpected IPv6 header type %d",
  511                                         __func__, off));
  512 error6:
  513                                 if (alloc)
  514                                         free(ptr, M_XDATA);
  515                                 m_freem(m);
  516                                 return EINVAL;
  517                         }
  518 
  519                 /* Copyback and free, if we allocated. */
  520                 if (alloc) {
  521                         m_copyback(m, sizeof(struct ip6_hdr),
  522                             skip - sizeof(struct ip6_hdr), ptr);
  523                         free(ptr, M_XDATA);
  524                 }
  525 
  526                 break;
  527 #endif /* INET6 */
  528         }
  529 
  530         return 0;
  531 }
  532 
  533 /*
  534  * ah_input() gets called to verify that an input packet
  535  * passes authentication.
  536  */
  537 static int
  538 ah_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  539 {
  540         IPSEC_DEBUG_DECLARE(char buf[128]);
  541         const struct auth_hash *ahx;
  542         struct cryptodesc *crda;
  543         struct cryptop *crp;
  544         struct xform_data *xd;
  545         struct newah *ah;
  546         crypto_session_t cryptoid;
  547         int hl, rplen, authsize, ahsize, error;
  548 
  549         IPSEC_ASSERT(sav != NULL, ("null SA"));
  550         IPSEC_ASSERT(sav->key_auth != NULL, ("null authentication key"));
  551         IPSEC_ASSERT(sav->tdb_authalgxform != NULL,
  552                 ("null authentication xform"));
  553 
  554         /* Figure out header size. */
  555         rplen = HDRSIZE(sav);
  556 
  557         /* XXX don't pullup, just copy header */
  558         IP6_EXTHDR_GET(ah, struct newah *, m, skip, rplen);
  559         if (ah == NULL) {
  560                 DPRINTF(("ah_input: cannot pullup header\n"));
  561                 AHSTAT_INC(ahs_hdrops);         /*XXX*/
  562                 error = ENOBUFS;
  563                 goto bad;
  564         }
  565 
  566         /* Check replay window, if applicable. */
  567         SECASVAR_LOCK(sav);
  568         if (sav->replay != NULL && sav->replay->wsize != 0 &&
  569             ipsec_chkreplay(ntohl(ah->ah_seq), sav) == 0) {
  570                 SECASVAR_UNLOCK(sav);
  571                 AHSTAT_INC(ahs_replay);
  572                 DPRINTF(("%s: packet replay failure: %s\n", __func__,
  573                     ipsec_sa2str(sav, buf, sizeof(buf))));
  574                 error = EACCES;
  575                 goto bad;
  576         }
  577         cryptoid = sav->tdb_cryptoid;
  578         SECASVAR_UNLOCK(sav);
  579 
  580         /* Verify AH header length. */
  581         hl = sizeof(struct ah) + (ah->ah_len * sizeof (u_int32_t));
  582         ahx = sav->tdb_authalgxform;
  583         authsize = AUTHSIZE(sav);
  584         ahsize = ah_hdrsiz(sav);
  585         if (hl != ahsize) {
  586                 DPRINTF(("%s: bad authenticator length %u (expecting %lu)"
  587                     " for packet in SA %s/%08lx\n", __func__, hl,
  588                     (u_long)ahsize,
  589                     ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
  590                     (u_long) ntohl(sav->spi)));
  591                 AHSTAT_INC(ahs_badauthl);
  592                 error = EACCES;
  593                 goto bad;
  594         }
  595         if (skip + ahsize > m->m_pkthdr.len) {
  596                 DPRINTF(("%s: bad mbuf length %u (expecting %lu)"
  597                     " for packet in SA %s/%08lx\n", __func__,
  598                     m->m_pkthdr.len, (u_long)(skip + ahsize),
  599                     ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
  600                     (u_long) ntohl(sav->spi)));
  601                 AHSTAT_INC(ahs_badauthl);
  602                 error = EACCES;
  603                 goto bad;
  604         }
  605         AHSTAT_ADD(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",
  611                     __func__));
  612                 AHSTAT_INC(ahs_crypto);
  613                 error = ENOBUFS;
  614                 goto bad;
  615         }
  616 
  617         crda = crp->crp_desc;
  618         IPSEC_ASSERT(crda != NULL, ("null crypto descriptor"));
  619 
  620         crda->crd_skip = 0;
  621         crda->crd_len = m->m_pkthdr.len;
  622         crda->crd_inject = skip + rplen;
  623 
  624         /* Authentication operation. */
  625         crda->crd_alg = ahx->type;
  626         crda->crd_klen = _KEYBITS(sav->key_auth);
  627         crda->crd_key = sav->key_auth->key_data;
  628 
  629         /* Allocate IPsec-specific opaque crypto info. */
  630         xd = malloc(sizeof(*xd) + skip + rplen + authsize, M_XDATA,
  631             M_NOWAIT | M_ZERO);
  632         if (xd == NULL) {
  633                 DPRINTF(("%s: failed to allocate xform_data\n", __func__));
  634                 AHSTAT_INC(ahs_crypto);
  635                 crypto_freereq(crp);
  636                 error = ENOBUFS;
  637                 goto bad;
  638         }
  639 
  640         /*
  641          * Save the authenticator, the skipped portion of the packet,
  642          * and the AH header.
  643          */
  644         m_copydata(m, 0, skip + rplen + authsize, (caddr_t)(xd + 1));
  645 
  646         /* Zeroize the authenticator on the packet. */
  647         m_copyback(m, skip + rplen, authsize, ipseczeroes);
  648 
  649         /* Save ah_nxt, since ah pointer can become invalid after "massage" */
  650         hl = ah->ah_nxt;
  651 
  652         /* "Massage" the packet headers for crypto processing. */
  653         error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
  654             skip, ahx->type, 0);
  655         if (error != 0) {
  656                 /* NB: mbuf is free'd by ah_massage_headers */
  657                 AHSTAT_INC(ahs_hdrops);
  658                 free(xd, M_XDATA);
  659                 crypto_freereq(crp);
  660                 key_freesav(&sav);
  661                 return (error);
  662         }
  663 
  664         /* Crypto operation descriptor. */
  665         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
  666         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
  667         if (V_async_crypto)
  668                 crp->crp_flags |= CRYPTO_F_ASYNC | CRYPTO_F_ASYNC_KEEPORDER;
  669         crp->crp_buf = (caddr_t) m;
  670         crp->crp_callback = ah_input_cb;
  671         crp->crp_session = cryptoid;
  672         crp->crp_opaque = (caddr_t) xd;
  673 
  674         /* These are passed as-is to the callback. */
  675         xd->sav = sav;
  676         xd->nxt = hl;
  677         xd->protoff = protoff;
  678         xd->skip = skip;
  679         xd->cryptoid = cryptoid;
  680         xd->vnet = curvnet;
  681         return (crypto_dispatch(crp));
  682 bad:
  683         m_freem(m);
  684         key_freesav(&sav);
  685         return (error);
  686 }
  687 
  688 /*
  689  * AH input callback from the crypto driver.
  690  */
  691 static int
  692 ah_input_cb(struct cryptop *crp)
  693 {
  694         IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
  695         unsigned char calc[AH_ALEN_MAX];
  696         struct mbuf *m;
  697         struct xform_data *xd;
  698         struct secasvar *sav;
  699         struct secasindex *saidx;
  700         caddr_t ptr;
  701         crypto_session_t cryptoid;
  702         int authsize, rplen, ahsize, error, skip, protoff;
  703         uint8_t nxt;
  704 
  705         m = (struct mbuf *) crp->crp_buf;
  706         xd = (struct xform_data *) crp->crp_opaque;
  707         CURVNET_SET(xd->vnet);
  708         sav = xd->sav;
  709         skip = xd->skip;
  710         nxt = xd->nxt;
  711         protoff = xd->protoff;
  712         cryptoid = xd->cryptoid;
  713         saidx = &sav->sah->saidx;
  714         IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
  715                 saidx->dst.sa.sa_family == AF_INET6,
  716                 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
  717 
  718         /* Check for crypto errors. */
  719         if (crp->crp_etype) {
  720                 if (crp->crp_etype == EAGAIN) {
  721                         /* Reset the session ID */
  722                         if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0)
  723                                 crypto_freesession(cryptoid);
  724                         xd->cryptoid = crp->crp_session;
  725                         CURVNET_RESTORE();
  726                         return (crypto_dispatch(crp));
  727                 }
  728                 AHSTAT_INC(ahs_noxform);
  729                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  730                 error = crp->crp_etype;
  731                 goto bad;
  732         } else {
  733                 AHSTAT_INC(ahs_hist[sav->alg_auth]);
  734                 crypto_freereq(crp);            /* No longer needed. */
  735                 crp = NULL;
  736         }
  737 
  738         /* Shouldn't happen... */
  739         if (m == NULL) {
  740                 AHSTAT_INC(ahs_crypto);
  741                 DPRINTF(("%s: bogus returned buffer from crypto\n", __func__));
  742                 error = EINVAL;
  743                 goto bad;
  744         }
  745 
  746         /* Figure out header size. */
  747         rplen = HDRSIZE(sav);
  748         authsize = AUTHSIZE(sav);
  749         ahsize = ah_hdrsiz(sav);
  750 
  751         /* Copy authenticator off the packet. */
  752         m_copydata(m, skip + rplen, authsize, calc);
  753 
  754         /* Verify authenticator. */
  755         ptr = (caddr_t) (xd + 1);
  756         if (timingsafe_bcmp(ptr + skip + rplen, calc, authsize)) {
  757                 DPRINTF(("%s: authentication hash mismatch for packet "
  758                     "in SA %s/%08lx\n", __func__,
  759                     ipsec_address(&saidx->dst, buf, sizeof(buf)),
  760                     (u_long) ntohl(sav->spi)));
  761                 AHSTAT_INC(ahs_badauth);
  762                 error = EACCES;
  763                 goto bad;
  764         }
  765         /* Fix the Next Protocol field. */
  766         ((uint8_t *) ptr)[protoff] = nxt;
  767 
  768         /* Copyback the saved (uncooked) network headers. */
  769         m_copyback(m, 0, skip, ptr);
  770         free(xd, M_XDATA), xd = NULL;                   /* No longer needed */
  771 
  772         /*
  773          * Header is now authenticated.
  774          */
  775         m->m_flags |= M_AUTHIPHDR|M_AUTHIPDGM;
  776 
  777         /*
  778          * Update replay sequence number, if appropriate.
  779          */
  780         if (sav->replay) {
  781                 u_int32_t seq;
  782 
  783                 m_copydata(m, skip + offsetof(struct newah, ah_seq),
  784                            sizeof (seq), (caddr_t) &seq);
  785                 SECASVAR_LOCK(sav);
  786                 if (ipsec_updatereplay(ntohl(seq), sav)) {
  787                         SECASVAR_UNLOCK(sav);
  788                         AHSTAT_INC(ahs_replay);
  789                         error = EACCES;
  790                         goto bad;
  791                 }
  792                 SECASVAR_UNLOCK(sav);
  793         }
  794 
  795         /*
  796          * Remove the AH header and authenticator from the mbuf.
  797          */
  798         error = m_striphdr(m, skip, ahsize);
  799         if (error) {
  800                 DPRINTF(("%s: mangled mbuf chain for SA %s/%08lx\n", __func__,
  801                     ipsec_address(&saidx->dst, buf, sizeof(buf)),
  802                     (u_long) ntohl(sav->spi)));
  803                 AHSTAT_INC(ahs_hdrops);
  804                 goto bad;
  805         }
  806 
  807         switch (saidx->dst.sa.sa_family) {
  808 #ifdef INET6
  809         case AF_INET6:
  810                 error = ipsec6_common_input_cb(m, sav, skip, protoff);
  811                 break;
  812 #endif
  813 #ifdef INET
  814         case AF_INET:
  815                 error = ipsec4_common_input_cb(m, sav, skip, protoff);
  816                 break;
  817 #endif
  818         default:
  819                 panic("%s: Unexpected address family: %d saidx=%p", __func__,
  820                     saidx->dst.sa.sa_family, saidx);
  821         }
  822         CURVNET_RESTORE();
  823         return error;
  824 bad:
  825         CURVNET_RESTORE();
  826         if (sav)
  827                 key_freesav(&sav);
  828         if (m != NULL)
  829                 m_freem(m);
  830         if (xd != NULL)
  831                 free(xd, M_XDATA);
  832         if (crp != NULL)
  833                 crypto_freereq(crp);
  834         return error;
  835 }
  836 
  837 /*
  838  * AH output routine, called by ipsec[46]_perform_request().
  839  */
  840 static int
  841 ah_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav,
  842     u_int idx, int skip, int protoff)
  843 {
  844         IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
  845         const struct auth_hash *ahx;
  846         struct cryptodesc *crda;
  847         struct xform_data *xd;
  848         struct mbuf *mi;
  849         struct cryptop *crp;
  850         struct newah *ah;
  851         crypto_session_t cryptoid;
  852         uint16_t iplen;
  853         int error, rplen, authsize, ahsize, maxpacketsize, roff;
  854         uint8_t prot;
  855 
  856         IPSEC_ASSERT(sav != NULL, ("null SA"));
  857         ahx = sav->tdb_authalgxform;
  858         IPSEC_ASSERT(ahx != NULL, ("null authentication xform"));
  859 
  860         AHSTAT_INC(ahs_output);
  861 
  862         /* Figure out header size. */
  863         rplen = HDRSIZE(sav);
  864         authsize = AUTHSIZE(sav);
  865         ahsize = ah_hdrsiz(sav);
  866 
  867         /* Check for maximum packet size violations. */
  868         switch (sav->sah->saidx.dst.sa.sa_family) {
  869 #ifdef INET
  870         case AF_INET:
  871                 maxpacketsize = IP_MAXPACKET;
  872                 break;
  873 #endif /* INET */
  874 #ifdef INET6
  875         case AF_INET6:
  876                 maxpacketsize = IPV6_MAXPACKET;
  877                 break;
  878 #endif /* INET6 */
  879         default:
  880                 DPRINTF(("%s: unknown/unsupported protocol family %u, "
  881                     "SA %s/%08lx\n", __func__,
  882                     sav->sah->saidx.dst.sa.sa_family,
  883                     ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
  884                     (u_long) ntohl(sav->spi)));
  885                 AHSTAT_INC(ahs_nopf);
  886                 error = EPFNOSUPPORT;
  887                 goto bad;
  888         }
  889         if (ahsize + m->m_pkthdr.len > maxpacketsize) {
  890                 DPRINTF(("%s: packet in SA %s/%08lx got too big "
  891                     "(len %u, max len %u)\n", __func__,
  892                     ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
  893                     (u_long) ntohl(sav->spi),
  894                     ahsize + m->m_pkthdr.len, maxpacketsize));
  895                 AHSTAT_INC(ahs_toobig);
  896                 error = EMSGSIZE;
  897                 goto bad;
  898         }
  899 
  900         /* Update the counters. */
  901         AHSTAT_ADD(ahs_obytes, m->m_pkthdr.len - skip);
  902 
  903         m = m_unshare(m, M_NOWAIT);
  904         if (m == NULL) {
  905                 DPRINTF(("%s: cannot clone mbuf chain, SA %s/%08lx\n", __func__,
  906                     ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
  907                     (u_long) ntohl(sav->spi)));
  908                 AHSTAT_INC(ahs_hdrops);
  909                 error = ENOBUFS;
  910                 goto bad;
  911         }
  912 
  913         /* Inject AH header. */
  914         mi = m_makespace(m, skip, ahsize, &roff);
  915         if (mi == NULL) {
  916                 DPRINTF(("%s: failed to inject %u byte AH header for SA "
  917                     "%s/%08lx\n", __func__, ahsize,
  918                     ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
  919                     (u_long) ntohl(sav->spi)));
  920                 AHSTAT_INC(ahs_hdrops);         /*XXX differs from openbsd */
  921                 error = ENOBUFS;
  922                 goto bad;
  923         }
  924 
  925         /*
  926          * The AH header is guaranteed by m_makespace() to be in
  927          * contiguous memory, at roff bytes offset into the returned mbuf.
  928          */
  929         ah = (struct newah *)(mtod(mi, caddr_t) + roff);
  930 
  931         /* Initialize the AH header. */
  932         m_copydata(m, protoff, sizeof(u_int8_t), (caddr_t) &ah->ah_nxt);
  933         ah->ah_len = (ahsize - sizeof(struct ah)) / sizeof(u_int32_t);
  934         ah->ah_reserve = 0;
  935         ah->ah_spi = sav->spi;
  936 
  937         /* Zeroize authenticator. */
  938         m_copyback(m, skip + rplen, authsize, ipseczeroes);
  939 
  940         /* Zeroize padding */
  941         m_copyback(m, skip + rplen + authsize, ahsize - (rplen + authsize),
  942             ipseczeroes);
  943 
  944         /* Insert packet replay counter, as requested.  */
  945         SECASVAR_LOCK(sav);
  946         if (sav->replay) {
  947                 if (sav->replay->count == ~0 &&
  948                     (sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
  949                         SECASVAR_UNLOCK(sav);
  950                         DPRINTF(("%s: replay counter wrapped for SA %s/%08lx\n",
  951                             __func__, ipsec_address(&sav->sah->saidx.dst, buf,
  952                             sizeof(buf)), (u_long) ntohl(sav->spi)));
  953                         AHSTAT_INC(ahs_wrap);
  954                         error = EACCES;
  955                         goto bad;
  956                 }
  957 #ifdef REGRESSION
  958                 /* Emulate replay attack when ipsec_replay is TRUE. */
  959                 if (!V_ipsec_replay)
  960 #endif
  961                         sav->replay->count++;
  962                 ah->ah_seq = htonl(sav->replay->count);
  963         }
  964         cryptoid = sav->tdb_cryptoid;
  965         SECASVAR_UNLOCK(sav);
  966 
  967         /* Get crypto descriptors. */
  968         crp = crypto_getreq(1);
  969         if (crp == NULL) {
  970                 DPRINTF(("%s: failed to acquire crypto descriptors\n",
  971                         __func__));
  972                 AHSTAT_INC(ahs_crypto);
  973                 error = ENOBUFS;
  974                 goto bad;
  975         }
  976 
  977         crda = crp->crp_desc;
  978         crda->crd_skip = 0;
  979         crda->crd_inject = skip + rplen;
  980         crda->crd_len = m->m_pkthdr.len;
  981 
  982         /* Authentication operation. */
  983         crda->crd_alg = ahx->type;
  984         crda->crd_key = sav->key_auth->key_data;
  985         crda->crd_klen = _KEYBITS(sav->key_auth);
  986 
  987         /* Allocate IPsec-specific opaque crypto info. */
  988         xd =  malloc(sizeof(struct xform_data) + skip, M_XDATA,
  989             M_NOWAIT | M_ZERO);
  990         if (xd == NULL) {
  991                 crypto_freereq(crp);
  992                 DPRINTF(("%s: failed to allocate xform_data\n", __func__));
  993                 AHSTAT_INC(ahs_crypto);
  994                 error = ENOBUFS;
  995                 goto bad;
  996         }
  997 
  998         /* Save the skipped portion of the packet. */
  999         m_copydata(m, 0, skip, (caddr_t) (xd + 1));
 1000 
 1001         /*
 1002          * Fix IP header length on the header used for
 1003          * authentication. We don't need to fix the original
 1004          * header length as it will be fixed by our caller.
 1005          */
 1006         switch (sav->sah->saidx.dst.sa.sa_family) {
 1007 #ifdef INET
 1008         case AF_INET:
 1009                 bcopy(((caddr_t)(xd + 1)) +
 1010                     offsetof(struct ip, ip_len),
 1011                     (caddr_t) &iplen, sizeof(u_int16_t));
 1012                 iplen = htons(ntohs(iplen) + ahsize);
 1013                 m_copyback(m, offsetof(struct ip, ip_len),
 1014                     sizeof(u_int16_t), (caddr_t) &iplen);
 1015                 break;
 1016 #endif /* INET */
 1017 
 1018 #ifdef INET6
 1019         case AF_INET6:
 1020                 bcopy(((caddr_t)(xd + 1)) +
 1021                     offsetof(struct ip6_hdr, ip6_plen),
 1022                     (caddr_t) &iplen, sizeof(uint16_t));
 1023                 iplen = htons(ntohs(iplen) + ahsize);
 1024                 m_copyback(m, offsetof(struct ip6_hdr, ip6_plen),
 1025                     sizeof(uint16_t), (caddr_t) &iplen);
 1026                 break;
 1027 #endif /* INET6 */
 1028         }
 1029 
 1030         /* Fix the Next Header field in saved header. */
 1031         ((uint8_t *) (xd + 1))[protoff] = IPPROTO_AH;
 1032 
 1033         /* Update the Next Protocol field in the IP header. */
 1034         prot = IPPROTO_AH;
 1035         m_copyback(m, protoff, sizeof(uint8_t), (caddr_t) &prot);
 1036 
 1037         /* "Massage" the packet headers for crypto processing. */
 1038         error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
 1039                         skip, ahx->type, 1);
 1040         if (error != 0) {
 1041                 m = NULL;       /* mbuf was free'd by ah_massage_headers. */
 1042                 free(xd, M_XDATA);
 1043                 crypto_freereq(crp);
 1044                 goto bad;
 1045         }
 1046 
 1047         /* Crypto operation descriptor. */
 1048         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
 1049         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
 1050         if (V_async_crypto)
 1051                 crp->crp_flags |= CRYPTO_F_ASYNC | CRYPTO_F_ASYNC_KEEPORDER;
 1052         crp->crp_buf = (caddr_t) m;
 1053         crp->crp_callback = ah_output_cb;
 1054         crp->crp_session = cryptoid;
 1055         crp->crp_opaque = (caddr_t) xd;
 1056 
 1057         /* These are passed as-is to the callback. */
 1058         xd->sp = sp;
 1059         xd->sav = sav;
 1060         xd->skip = skip;
 1061         xd->idx = idx;
 1062         xd->cryptoid = cryptoid;
 1063         xd->vnet = curvnet;
 1064 
 1065         return crypto_dispatch(crp);
 1066 bad:
 1067         if (m)
 1068                 m_freem(m);
 1069         key_freesav(&sav);
 1070         key_freesp(&sp);
 1071         return (error);
 1072 }
 1073 
 1074 /*
 1075  * AH output callback from the crypto driver.
 1076  */
 1077 static int
 1078 ah_output_cb(struct cryptop *crp)
 1079 {
 1080         struct xform_data *xd;
 1081         struct secpolicy *sp;
 1082         struct secasvar *sav;
 1083         struct mbuf *m;
 1084         crypto_session_t cryptoid;
 1085         caddr_t ptr;
 1086         u_int idx;
 1087         int skip, error;
 1088 
 1089         m = (struct mbuf *) crp->crp_buf;
 1090         xd = (struct xform_data *) crp->crp_opaque;
 1091         CURVNET_SET(xd->vnet);
 1092         sp = xd->sp;
 1093         sav = xd->sav;
 1094         skip = xd->skip;
 1095         idx = xd->idx;
 1096         cryptoid = xd->cryptoid;
 1097         ptr = (caddr_t) (xd + 1);
 1098 
 1099         /* Check for crypto errors. */
 1100         if (crp->crp_etype) {
 1101                 if (crp->crp_etype == EAGAIN) {
 1102                         /* Reset the session ID */
 1103                         if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0)
 1104                                 crypto_freesession(cryptoid);
 1105                         xd->cryptoid = crp->crp_session;
 1106                         CURVNET_RESTORE();
 1107                         return (crypto_dispatch(crp));
 1108                 }
 1109                 AHSTAT_INC(ahs_noxform);
 1110                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
 1111                 error = crp->crp_etype;
 1112                 m_freem(m);
 1113                 goto bad;
 1114         }
 1115 
 1116         /* Shouldn't happen... */
 1117         if (m == NULL) {
 1118                 AHSTAT_INC(ahs_crypto);
 1119                 DPRINTF(("%s: bogus returned buffer from crypto\n", __func__));
 1120                 error = EINVAL;
 1121                 goto bad;
 1122         }
 1123         /*
 1124          * Copy original headers (with the new protocol number) back
 1125          * in place.
 1126          */
 1127         m_copyback(m, 0, skip, ptr);
 1128 
 1129         free(xd, M_XDATA);
 1130         crypto_freereq(crp);
 1131         AHSTAT_INC(ahs_hist[sav->alg_auth]);
 1132 #ifdef REGRESSION
 1133         /* Emulate man-in-the-middle attack when ipsec_integrity is TRUE. */
 1134         if (V_ipsec_integrity) {
 1135                 int alen;
 1136 
 1137                 /*
 1138                  * Corrupt HMAC if we want to test integrity verification of
 1139                  * the other side.
 1140                  */
 1141                 alen = AUTHSIZE(sav);
 1142                 m_copyback(m, m->m_pkthdr.len - alen, alen, ipseczeroes);
 1143         }
 1144 #endif
 1145 
 1146         /* NB: m is reclaimed by ipsec_process_done. */
 1147         error = ipsec_process_done(m, sp, sav, idx);
 1148         CURVNET_RESTORE();
 1149         return (error);
 1150 bad:
 1151         CURVNET_RESTORE();
 1152         free(xd, M_XDATA);
 1153         crypto_freereq(crp);
 1154         key_freesav(&sav);
 1155         key_freesp(&sp);
 1156         return (error);
 1157 }
 1158 
 1159 static struct xformsw ah_xformsw = {
 1160         .xf_type =      XF_AH,
 1161         .xf_name =      "IPsec AH",
 1162         .xf_init =      ah_init,
 1163         .xf_zeroize =   ah_zeroize,
 1164         .xf_input =     ah_input,
 1165         .xf_output =    ah_output,
 1166 };
 1167 
 1168 SYSINIT(ah_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
 1169     xform_attach, &ah_xformsw);
 1170 SYSUNINIT(ah_xform_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
 1171     xform_detach, &ah_xformsw);

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