ipsec-tools/racoon/proposal.c

   1 /* $Id: proposal.c,v 1.13.8.5 2005/07/28 05:05:52 manubsd Exp $ */
   2
   3 /*
   4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the project nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include "config.h"
  33
  34 #include <sys/param.h>
  35 #include <sys/types.h>
  36 #include <sys/socket.h>
  37 #include <sys/queue.h>
  38
  39 #include <netinet/in.h>
  40 #ifdef HAVE_NETINET6_IPSEC
  41 #  include <netinet6/ipsec.h>
  42 #else
  43 #  include <netinet/ipsec.h>
  44 #endif
  45
  46 #include <stdlib.h>
  47 #include <stdio.h>
  48 #include <string.h>
  49 #include <errno.h>
  50
  51 #include "var.h"
  52 #include "misc.h"
  53 #include "vmbuf.h"
  54 #include "plog.h"
  55 #include "sockmisc.h"
  56 #include "debug.h"
  57
  58 #include "policy.h"
  59 #include "pfkey.h"
  60 #include "isakmp_var.h"
  61 #include "isakmp.h"
  62 #include "ipsec_doi.h"
  63 #include "algorithm.h"
  64 #include "proposal.h"
  65 #include "sainfo.h"
  66 #include "localconf.h"
  67 #include "remoteconf.h"
  68 #include "oakley.h"
  69 #include "handler.h"
  70 #include "strnames.h"
  71 #include "gcmalloc.h"
  72 #ifdef ENABLE_NATT
  73 #include "nattraversal.h"
  74 #endif
  75
  76 /* %%%
  77  * modules for ipsec sa spec
  78  */
  79 struct saprop *
  80 newsaprop()
  81 {
  82         struct saprop *new;
  83
  84         new = racoon_calloc(1, sizeof(*new));
  85         if (new == NULL)
  86                 return NULL;
  87
  88         return new;
  89 }
  90
  91 struct saproto *
  92 newsaproto()
  93 {
  94         struct saproto *new;
  95
  96         new = racoon_calloc(1, sizeof(*new));
  97         if (new == NULL)
  98                 return NULL;
  99
 100         return new;
 101 }
 102
 103 /* set saprop to last part of the prop tree */
 104 void
 105 inssaprop(head, new)
 106         struct saprop **head;
 107         struct saprop *new;
 108 {
 109         struct saprop *p;
 110
 111         if (*head == NULL) {
 112                 *head = new;
 113                 return;
 114         }
 115
 116         for (p = *head; p->next; p = p->next)
 117                 ;
 118         p->next = new;
 119
 120         return;
 121 }
 122
 123 /* set saproto to the end of the proto tree in saprop */
 124 void
 125 inssaproto(pp, new)
 126         struct saprop *pp;
 127         struct saproto *new;
 128 {
 129         struct saproto *p;
 130
 131         for (p = pp->head; p && p->next; p = p->next)
 132                 ;
 133         if (p == NULL)
 134                 pp->head = new;
 135         else
 136                 p->next = new;
 137
 138         return;
 139 }
 140
 141 /* set saproto to the top of the proto tree in saprop */
 142 void
 143 inssaprotorev(pp, new)
 144       struct saprop *pp;
 145       struct saproto *new;
 146 {
 147       new->next = pp->head;
 148       pp->head = new;
 149
 150       return;
 151 }
 152
 153 struct satrns *
 154 newsatrns()
 155 {
 156         struct satrns *new;
 157
 158         new = racoon_calloc(1, sizeof(*new));
 159         if (new == NULL)
 160                 return NULL;
 161
 162         return new;
 163 }
 164
 165 /* set saproto to last part of the proto tree in saprop */
 166 void
 167 inssatrns(pr, new)
 168         struct saproto *pr;
 169         struct satrns *new;
 170 {
 171         struct satrns *tr;
 172
 173         for (tr = pr->head; tr && tr->next; tr = tr->next)
 174                 ;
 175         if (tr == NULL)
 176                 pr->head = new;
 177         else
 178                 tr->next = new;
 179
 180         return;
 181 }
 182
 183 /*
 184  * take a single match between saprop.  allocate a new proposal and return it
 185  * for future use (like picking single proposal from a bundle).
 186  *      pp1: peer's proposal.
 187  *      pp2: my proposal.
 188  * NOTE: In the case of initiator, must be ensured that there is no
 189  * modification of the proposal by calling cmp_aproppair_i() before
 190  * this function.
 191  * XXX cannot understand the comment!
 192  */
 193 struct saprop *
 194 cmpsaprop_alloc(ph1, pp1, pp2, side)
 195         struct ph1handle *ph1;
 196         const struct saprop *pp1, *pp2;
 197         int side;
 198 {
 199         struct saprop *newpp = NULL;
 200         struct saproto *pr1, *pr2, *newpr = NULL;
 201         struct satrns *tr1, *tr2, *newtr;
 202         const int ordermatters = 0;
 203         int npr1, npr2;
 204         int spisizematch;
 205
 206         newpp = newsaprop();
 207         if (newpp == NULL) {
 208                 plog(LLV_ERROR, LOCATION, NULL,
 209                         "failed to allocate saprop.\n");
 210                 return NULL;
 211         }
 212         newpp->prop_no = pp1->prop_no;
 213
 214         /* see proposal.h about lifetime/key length and PFS selection. */
 215
 216         /* check time/bytes lifetime and PFS */
 217         switch (ph1->rmconf->pcheck_level) {
 218         case PROP_CHECK_OBEY:
 219                 newpp->lifetime = pp1->lifetime;
 220                 newpp->lifebyte = pp1->lifebyte;
 221                 newpp->pfs_group = pp1->pfs_group;
 222                 break;
 223
 224         case PROP_CHECK_STRICT:
 225                 if (pp1->lifetime > pp2->lifetime) {
 226                         plog(LLV_ERROR, LOCATION, NULL,
 227                                 "long lifetime proposed: "
 228                                 "my:%d peer:%d\n",
 229                                 (int)pp2->lifetime, (int)pp1->lifetime);
 230                         goto err;
 231                 }
 232                 if (pp1->lifebyte > pp2->lifebyte) {
 233                         plog(LLV_ERROR, LOCATION, NULL,
 234                                 "long lifebyte proposed: "
 235                                 "my:%d peer:%d\n",
 236                                 pp2->lifebyte, pp1->lifebyte);
 237                         goto err;
 238                 }
 239                 newpp->lifetime = pp1->lifetime;
 240                 newpp->lifebyte = pp1->lifebyte;
 241
 242     prop_pfs_check:
 243                 if (pp2->pfs_group != 0 && pp1->pfs_group != pp2->pfs_group) {
 244                         plog(LLV_ERROR, LOCATION, NULL,
 245                                 "pfs group mismatched: "
 246                                 "my:%d peer:%d\n",
 247                                 pp2->pfs_group, pp1->pfs_group);
 248                         goto err;
 249                 }
 250                 newpp->pfs_group = pp1->pfs_group;
 251                 break;
 252
 253         case PROP_CHECK_CLAIM:
 254                 /* lifetime */
 255                 if (pp1->lifetime <= pp2->lifetime) {
 256                         newpp->lifetime = pp1->lifetime;
 257                 } else {
 258                         newpp->lifetime = pp2->lifetime;
 259                         newpp->claim |= IPSECDOI_ATTR_SA_LD_TYPE_SEC;
 260                         plog(LLV_NOTIFY, LOCATION, NULL,
 261                                 "use own lifetime: "
 262                                 "my:%d peer:%d\n",
 263                                 (int)pp2->lifetime, (int)pp1->lifetime);
 264                 }
 265
 266                 /* lifebyte */
 267                 if (pp1->lifebyte > pp2->lifebyte) {
 268                         newpp->lifebyte = pp2->lifebyte;
 269                         newpp->claim |= IPSECDOI_ATTR_SA_LD_TYPE_SEC;
 270                         plog(LLV_NOTIFY, LOCATION, NULL,
 271                                 "use own lifebyte: "
 272                                 "my:%d peer:%d\n",
 273                                 pp2->lifebyte, pp1->lifebyte);
 274                 }
 275                 newpp->lifebyte = pp1->lifebyte;
 276
 277                 goto prop_pfs_check;
 278                 break;
 279
 280         case PROP_CHECK_EXACT:
 281                 if (pp1->lifetime != pp2->lifetime) {
 282                         plog(LLV_ERROR, LOCATION, NULL,
 283                                 "lifetime mismatched: "
 284                                 "my:%d peer:%d\n",
 285                                 (int)pp2->lifetime, (int)pp1->lifetime);
 286                         goto err;
 287                 }
 288
 289                 if (pp1->lifebyte != pp2->lifebyte) {
 290                         plog(LLV_ERROR, LOCATION, NULL,
 291                                 "lifebyte mismatched: "
 292                                 "my:%d peer:%d\n",
 293                                 pp2->lifebyte, pp1->lifebyte);
 294                         goto err;
 295                 }
 296                 if (pp1->pfs_group != pp2->pfs_group) {
 297                         plog(LLV_ERROR, LOCATION, NULL,
 298                                 "pfs group mismatched: "
 299                                 "my:%d peer:%d\n",
 300                                 pp2->pfs_group, pp1->pfs_group);
 301                         goto err;
 302                 }
 303                 newpp->lifetime = pp1->lifetime;
 304                 newpp->lifebyte = pp1->lifebyte;
 305                 newpp->pfs_group = pp1->pfs_group;
 306                 break;
 307
 308         default:
 309                 plog(LLV_ERROR, LOCATION, NULL,
 310                         "invalid pcheck_level why?.\n");
 311                 goto err;
 312         }
 313
 314         npr1 = npr2 = 0;
 315         for (pr1 = pp1->head; pr1; pr1 = pr1->next)
 316                 npr1++;
 317         for (pr2 = pp2->head; pr2; pr2 = pr2->next)
 318                 npr2++;
 319         if (npr1 != npr2)
 320                 goto err;
 321
 322         /* check protocol order */
 323         pr1 = pp1->head;
 324         pr2 = pp2->head;
 325
 326         while (1) {
 327                 if (!ordermatters) {
 328                         /*
 329                          * XXX does not work if we have multiple proposals
 330                          * with the same proto_id
 331                          */
 332                         switch (side) {
 333                         case RESPONDER:
 334                                 if (!pr2)
 335                                         break;
 336                                 for (pr1 = pp1->head; pr1; pr1 = pr1->next) {
 337                                         if (pr1->proto_id == pr2->proto_id)
 338                                                 break;
 339                                 }
 340                                 break;
 341                         case INITIATOR:
 342                                 if (!pr1)
 343                                         break;
 344                                 for (pr2 = pp2->head; pr2; pr2 = pr2->next) {
 345                                         if (pr2->proto_id == pr1->proto_id)
 346                                                 break;
 347                                 }
 348                                 break;
 349                         }
 350                 }
 351                 if (!pr1 || !pr2)
 352                         break;
 353
 354                 if (pr1->proto_id != pr2->proto_id) {
 355                         plog(LLV_ERROR, LOCATION, NULL,
 356                                 "proto_id mismatched: "
 357                                 "my:%s peer:%s\n",
 358                                 s_ipsecdoi_proto(pr2->proto_id),
 359                                 s_ipsecdoi_proto(pr1->proto_id));
 360                         goto err;
 361                 }
 362                 spisizematch = 0;
 363                 if (pr1->spisize == pr2->spisize)
 364                         spisizematch = 1;
 365                 else if (pr1->proto_id == IPSECDOI_PROTO_IPCOMP) {
 366                         /*
 367                          * draft-shacham-ippcp-rfc2393bis-05.txt:
 368                          * need to accept 16bit and 32bit SPI (CPI) for IPComp.
 369                          */
 370                         if (pr1->spisize == sizeof(u_int16_t) &&
 371                             pr2->spisize == sizeof(u_int32_t)) {
 372                                 spisizematch = 1;
 373                         } else if (pr2->spisize == sizeof(u_int16_t) &&
 374                                  pr1->spisize == sizeof(u_int32_t)) {
 375                                 spisizematch = 1;
 376                         }
 377                         if (spisizematch) {
 378                                 plog(LLV_ERROR, LOCATION, NULL,
 379                                     "IPComp SPI size promoted "
 380                                     "from 16bit to 32bit\n");
 381                         }
 382                 }
 383                 if (!spisizematch) {
 384                         plog(LLV_ERROR, LOCATION, NULL,
 385                                 "spisize mismatched: "
 386                                 "my:%d peer:%d\n",
 387                                 (int)pr2->spisize, (int)pr1->spisize);
 388                         goto err;
 389                 }
 390
 391 #ifdef ENABLE_NATT
 392                 if ((ph1->natt_flags & NAT_DETECTED) &&
 393                     natt_udp_encap (pr2->encmode))
 394                 {
 395                         plog(LLV_INFO, LOCATION, NULL, "Adjusting my encmode %s->%s\n",
 396                              s_ipsecdoi_encmode(pr2->encmode),
 397                              s_ipsecdoi_encmode(pr2->encmode - ph1->natt_options->mode_udp_diff));
 398                         pr2->encmode -= ph1->natt_options->mode_udp_diff;
 399                         pr2->udp_encap = 1;
 400                 }
 401
 402                 if ((ph1->natt_flags & NAT_DETECTED) &&
 403                     natt_udp_encap (pr1->encmode))
 404                 {
 405                         plog(LLV_INFO, LOCATION, NULL, "Adjusting peer's encmode %s(%d)->%s(%d)\n",
 406                              s_ipsecdoi_encmode(pr1->encmode),
 407                              pr1->encmode,
 408                              s_ipsecdoi_encmode(pr1->encmode - ph1->natt_options->mode_udp_diff),
 409                              pr1->encmode - ph1->natt_options->mode_udp_diff);
 410                         pr1->encmode -= ph1->natt_options->mode_udp_diff;
 411                         pr1->udp_encap = 1;
 412                 }
 413 #endif
 414
 415                 if (pr1->encmode != pr2->encmode) {
 416                         plog(LLV_ERROR, LOCATION, NULL,
 417                                 "encmode mismatched: "
 418                                 "my:%s peer:%s\n",
 419                                 s_ipsecdoi_encmode(pr2->encmode),
 420                                 s_ipsecdoi_encmode(pr1->encmode));
 421                         goto err;
 422                 }
 423
 424                 for (tr1 = pr1->head; tr1; tr1 = tr1->next) {
 425                         for (tr2 = pr2->head; tr2; tr2 = tr2->next) {
 426                                 if (cmpsatrns(pr1->proto_id, tr1, tr2) == 0)
 427                                         goto found;
 428                         }
 429                 }
 430
 431                 goto err;
 432
 433             found:
 434                 newpr = newsaproto();
 435                 if (newpr == NULL) {
 436                         plog(LLV_ERROR, LOCATION, NULL,
 437                                 "failed to allocate saproto.\n");
 438                         goto err;
 439                 }
 440                 newpr->proto_id = pr1->proto_id;
 441                 newpr->spisize = pr1->spisize;
 442                 newpr->encmode = pr1->encmode;
 443                 newpr->spi = pr2->spi;          /* copy my SPI */
 444                 newpr->spi_p = pr1->spi;        /* copy peer's SPI */
 445                 newpr->reqid_in = pr2->reqid_in;
 446                 newpr->reqid_out = pr2->reqid_out;
 447 #ifdef ENABLE_NATT
 448                 newpr->udp_encap = pr1->udp_encap | pr2->udp_encap;
 449 #endif
 450
 451                 newtr = newsatrns();
 452                 if (newtr == NULL) {
 453                         plog(LLV_ERROR, LOCATION, NULL,
 454                                 "failed to allocate satrns.\n");
 455                         goto err;
 456                 }
 457                 newtr->trns_no = tr1->trns_no;
 458                 newtr->trns_id = tr1->trns_id;
 459                 newtr->encklen = tr1->encklen;
 460                 newtr->authtype = tr1->authtype;
 461
 462                 inssatrns(newpr, newtr);
 463                 inssaproto(newpp, newpr);
 464
 465                 pr1 = pr1->next;
 466                 pr2 = pr2->next;
 467         }
 468
 469         /* XXX should check if we have visited all items or not */
 470         if (!ordermatters) {
 471                 switch (side) {
 472                 case RESPONDER:
 473                         if (!pr2)
 474                                 pr1 = NULL;
 475                         break;
 476                 case INITIATOR:
 477                         if (!pr1)
 478                                 pr2 = NULL;
 479                         break;
 480                 }
 481         }
 482
 483         /* should be matched all protocols in a proposal */
 484         if (pr1 != NULL || pr2 != NULL)
 485                 goto err;
 486
 487         return newpp;
 488
 489 err:
 490         flushsaprop(newpp);
 491         return NULL;
 492 }
 493
 494 /* take a single match between saprop.  returns 0 if pp1 equals to pp2. */
 495 int
 496 cmpsaprop(pp1, pp2)
 497         const struct saprop *pp1, *pp2;
 498 {
 499         if (pp1->pfs_group != pp2->pfs_group) {
 500                 plog(LLV_WARNING, LOCATION, NULL,
 501                         "pfs_group mismatch. mine:%d peer:%d\n",
 502                         pp1->pfs_group, pp2->pfs_group);
 503                 /* FALLTHRU */
 504         }
 505
 506         if (pp1->lifetime > pp2->lifetime) {
 507                 plog(LLV_WARNING, LOCATION, NULL,
 508                         "less lifetime proposed. mine:%d peer:%d\n",
 509                         (int)pp1->lifetime, (int)pp2->lifetime);
 510                 /* FALLTHRU */
 511         }
 512         if (pp1->lifebyte > pp2->lifebyte) {
 513                 plog(LLV_WARNING, LOCATION, NULL,
 514                         "less lifebyte proposed. mine:%d peer:%d\n",
 515                         pp1->lifebyte, pp2->lifebyte);
 516                 /* FALLTHRU */
 517         }
 518
 519         return 0;
 520 }
 521
 522 /*
 523  * take a single match between satrns.  returns 0 if tr1 equals to tr2.
 524  * tr1: peer's satrns
 525  * tr2: my satrns
 526  */
 527 int
 528 cmpsatrns(proto_id, tr1, tr2)
 529         int proto_id;
 530         const struct satrns *tr1, *tr2;
 531 {
 532         if (tr1->trns_id != tr2->trns_id) {
 533                 plog(LLV_WARNING, LOCATION, NULL,
 534                         "trns_id mismatched: "
 535                         "my:%s peer:%s\n",
 536                         s_ipsecdoi_trns(proto_id, tr2->trns_id),
 537                         s_ipsecdoi_trns(proto_id, tr1->trns_id));
 538                 return 1;
 539         }
 540
 541         if (tr1->authtype != tr2->authtype) {
 542                 plog(LLV_WARNING, LOCATION, NULL,
 543                         "authtype mismatched: "
 544                         "my:%s peer:%s\n",
 545                         s_ipsecdoi_attr_v(IPSECDOI_ATTR_AUTH, tr2->authtype),
 546                         s_ipsecdoi_attr_v(IPSECDOI_ATTR_AUTH, tr1->authtype));
 547                 return 1;
 548         }
 549
 550         /* XXX
 551          * At this moment for interoperability, the responder obey
 552          * the initiator.  It should be defined a notify message.
 553          */
 554         if (tr1->encklen > tr2->encklen) {
 555                 plog(LLV_WARNING, LOCATION, NULL,
 556                         "less key length proposed, "
 557                         "mine:%d peer:%d.  Use initiaotr's one.\n",
 558                         tr2->encklen, tr1->encklen);
 559                 /* FALLTHRU */
 560         }
 561
 562         return 0;
 563 }
 564
 565 int
 566 set_satrnsbysainfo(pr, sainfo)
 567         struct saproto *pr;
 568         struct sainfo *sainfo;
 569 {
 570         struct sainfoalg *a, *b;
 571         struct satrns *newtr;
 572         int t;
 573
 574         switch (pr->proto_id) {
 575         case IPSECDOI_PROTO_IPSEC_AH:
 576                 if (sainfo->algs[algclass_ipsec_auth] == NULL) {
 577                         plog(LLV_ERROR, LOCATION, NULL,
 578                                 "no auth algorithm found\n");
 579                         goto err;
 580                 }
 581                 t = 1;
 582                 for (a = sainfo->algs[algclass_ipsec_auth]; a; a = a->next) {
 583
 584                         if (a->alg == IPSECDOI_ATTR_AUTH_NONE)
 585                                 continue;
 586
 587                         /* allocate satrns */
 588                         newtr = newsatrns();
 589                         if (newtr == NULL) {
 590                                 plog(LLV_ERROR, LOCATION, NULL,
 591                                         "failed to allocate satrns.\n");
 592                                 goto err;
 593                         }
 594
 595                         newtr->trns_no = t++;
 596                         newtr->trns_id = ipsecdoi_authalg2trnsid(a->alg);
 597                         newtr->authtype = a->alg;
 598
 599                         inssatrns(pr, newtr);
 600                 }
 601                 break;
 602         case IPSECDOI_PROTO_IPSEC_ESP:
 603                 if (sainfo->algs[algclass_ipsec_enc] == NULL) {
 604                         plog(LLV_ERROR, LOCATION, NULL,
 605                                 "no encryption algorithm found\n");
 606                         goto err;
 607                 }
 608                 t = 1;
 609                 for (a = sainfo->algs[algclass_ipsec_enc]; a; a = a->next) {
 610                         for (b = sainfo->algs[algclass_ipsec_auth]; b; b = b->next) {
 611                                 /* allocate satrns */
 612                                 newtr = newsatrns();
 613                                 if (newtr == NULL) {
 614                                         plog(LLV_ERROR, LOCATION, NULL,
 615                                                 "failed to allocate satrns.\n");
 616                                         goto err;
 617                                 }
 618
 619                                 newtr->trns_no = t++;
 620                                 newtr->trns_id = a->alg;
 621                                 newtr->encklen = a->encklen;
 622                                 newtr->authtype = b->alg;
 623
 624                                 inssatrns(pr, newtr);
 625                         }
 626                 }
 627                 break;
 628         case IPSECDOI_PROTO_IPCOMP:
 629                 if (sainfo->algs[algclass_ipsec_comp] == NULL) {
 630                         plog(LLV_ERROR, LOCATION, NULL,
 631                                 "no ipcomp algorithm found\n");
 632                         goto err;
 633                 }
 634                 t = 1;
 635                 for (a = sainfo->algs[algclass_ipsec_comp]; a; a = a->next) {
 636
 637                         /* allocate satrns */
 638                         newtr = newsatrns();
 639                         if (newtr == NULL) {
 640                                 plog(LLV_ERROR, LOCATION, NULL,
 641                                         "failed to allocate satrns.\n");
 642                                 goto err;
 643                         }
 644
 645                         newtr->trns_no = t++;
 646                         newtr->trns_id = a->alg;
 647                         newtr->authtype = IPSECDOI_ATTR_AUTH_NONE; /*no auth*/
 648
 649                         inssatrns(pr, newtr);
 650                 }
 651                 break;
 652         default:
 653                 plog(LLV_ERROR, LOCATION, NULL,
 654                         "unknown proto_id (%d).\n", pr->proto_id);
 655                 goto err;
 656         }
 657
 658         /* no proposal found */
 659         if (pr->head == NULL) {
 660                 plog(LLV_ERROR, LOCATION, NULL, "no algorithms found.\n");
 661                 return -1;
 662         }
 663
 664         return 0;
 665
 666 err:
 667         flushsatrns(pr->head);
 668         return -1;
 669 }
 670
 671 struct saprop *
 672 aproppair2saprop(p0)
 673         struct prop_pair *p0;
 674 {
 675         struct prop_pair *p, *t;
 676         struct saprop *newpp;
 677         struct saproto *newpr;
 678         struct satrns *newtr;
 679         u_int8_t *spi;
 680
 681         if (p0 == NULL)
 682                 return NULL;
 683
 684         /* allocate ipsec a sa proposal */
 685         newpp = newsaprop();
 686         if (newpp == NULL) {
 687                 plog(LLV_ERROR, LOCATION, NULL,
 688                         "failed to allocate saprop.\n");
 689                 return NULL;
 690         }
 691         newpp->prop_no = p0->prop->p_no;
 692         /* lifetime & lifebyte must be updated later */
 693
 694         for (p = p0; p; p = p->next) {
 695
 696                 /* allocate ipsec sa protocol */
 697                 newpr = newsaproto();
 698                 if (newpr == NULL) {
 699                         plog(LLV_ERROR, LOCATION, NULL,
 700                                 "failed to allocate saproto.\n");
 701                         goto err;
 702                 }
 703
 704                 /* check spi size */
 705                 /* XXX should be handled isakmp cookie */
 706                 if (sizeof(newpr->spi) < p->prop->spi_size) {
 707                         plog(LLV_ERROR, LOCATION, NULL,
 708                                 "invalid spi size %d.\n", p->prop->spi_size);
 709                         goto err;
 710                 }
 711
 712                 /*
 713                  * XXX SPI bits are left-filled, for use with IPComp.
 714                  * we should be switching to variable-length spi field...
 715                  */
 716                 newpr->proto_id = p->prop->proto_id;
 717                 newpr->spisize = p->prop->spi_size;
 718                 memset(&newpr->spi, 0, sizeof(newpr->spi));
 719                 spi = (u_int8_t *)&newpr->spi;
 720                 spi += sizeof(newpr->spi);
 721                 spi -= p->prop->spi_size;
 722                 memcpy(spi, p->prop + 1, p->prop->spi_size);
 723                 newpr->reqid_in = 0;
 724                 newpr->reqid_out = 0;
 725
 726                 for (t = p; t; t = t->tnext) {
 727
 728                         plog(LLV_DEBUG, LOCATION, NULL,
 729                                 "prop#=%d prot-id=%s spi-size=%d "
 730                                 "#trns=%d trns#=%d trns-id=%s\n",
 731                                 t->prop->p_no,
 732                                 s_ipsecdoi_proto(t->prop->proto_id),
 733                                 t->prop->spi_size, t->prop->num_t,
 734                                 t->trns->t_no,
 735                                 s_ipsecdoi_trns(t->prop->proto_id,
 736                                 t->trns->t_id));
 737
 738                         /* allocate ipsec sa transform */
 739                         newtr = newsatrns();
 740                         if (newtr == NULL) {
 741                                 plog(LLV_ERROR, LOCATION, NULL,
 742                                         "failed to allocate satrns.\n");
 743                                 goto err;
 744                         }
 745
 746                         if (ipsecdoi_t2satrns(t->trns, newpp, newpr, newtr) < 0) {
 747                                 flushsaprop(newpp);
 748                                 return NULL;
 749                         }
 750
 751                         inssatrns(newpr, newtr);
 752                 }
 753
 754                 /*
 755                  * If the peer does not specify encryption mode, use
 756                  * transport mode by default.  This is to conform to
 757                  * draft-shacham-ippcp-rfc2393bis-08.txt (explicitly specifies
 758                  * that unspecified == transport), as well as RFC2407
 759                  * (unspecified == implementation dependent default).
 760                  */
 761                 if (newpr->encmode == 0)
 762                         newpr->encmode = IPSECDOI_ATTR_ENC_MODE_TRNS;
 763
 764                 inssaproto(newpp, newpr);
 765         }
 766
 767         return newpp;
 768
 769 err:
 770         flushsaprop(newpp);
 771         return NULL;
 772 }
 773
 774 void
 775 flushsaprop(head)
 776         struct saprop *head;
 777 {
 778         struct saprop *p, *save;
 779
 780         for (p = head; p != NULL; p = save) {
 781                 save = p->next;
 782                 flushsaproto(p->head);
 783                 racoon_free(p);
 784         }
 785
 786         return;
 787 }
 788
 789 void
 790 flushsaproto(head)
 791         struct saproto *head;
 792 {
 793         struct saproto *p, *save;
 794
 795         for (p = head; p != NULL; p = save) {
 796                 save = p->next;
 797                 flushsatrns(p->head);
 798                 vfree(p->keymat);
 799                 vfree(p->keymat_p);
 800                 racoon_free(p);
 801         }
 802
 803         return;
 804 }
 805
 806 void
 807 flushsatrns(head)
 808         struct satrns *head;
 809 {
 810         struct satrns *p, *save;
 811
 812         for (p = head; p != NULL; p = save) {
 813                 save = p->next;
 814                 racoon_free(p);
 815         }
 816
 817         return;
 818 }
 819
 820 /*
 821  * print multiple proposals
 822  */
 823 void
 824 printsaprop(pri, pp)
 825         const int pri;
 826         const struct saprop *pp;
 827 {
 828         const struct saprop *p;
 829
 830         if (pp == NULL) {
 831                 plog(pri, LOCATION, NULL, "(null)");
 832                 return;
 833         }
 834
 835         for (p = pp; p; p = p->next) {
 836                 printsaprop0(pri, p);
 837         }
 838
 839         return;
 840 }
 841
 842 /*
 843  * print one proposal.
 844  */
 845 void
 846 printsaprop0(pri, pp)
 847         int pri;
 848         const struct saprop *pp;
 849 {
 850         const struct saproto *p;
 851
 852         if (pp == NULL)
 853                 return;
 854
 855         for (p = pp->head; p; p = p->next) {
 856                 printsaproto(pri, p);
 857         }
 858
 859         return;
 860 }
 861
 862 void
 863 printsaproto(pri, pr)
 864         const int pri;
 865         const struct saproto *pr;
 866 {
 867         struct satrns *tr;
 868
 869         if (pr == NULL)
 870                 return;
 871
 872         plog(pri, LOCATION, NULL,
 873                 " (proto_id=%s spisize=%d spi=%08lx spi_p=%08lx "
 874                 "encmode=%s reqid=%d:%d)\n",
 875                 s_ipsecdoi_proto(pr->proto_id),
 876                 (int)pr->spisize,
 877                 (unsigned long)ntohl(pr->spi),
 878                 (unsigned long)ntohl(pr->spi_p),
 879                 s_ipsecdoi_attr_v(IPSECDOI_ATTR_ENC_MODE, pr->encmode),
 880                 (int)pr->reqid_in, (int)pr->reqid_out);
 881
 882         for (tr = pr->head; tr; tr = tr->next) {
 883                 printsatrns(pri, pr->proto_id, tr);
 884         }
 885
 886         return;
 887 }
 888
 889 void
 890 printsatrns(pri, proto_id, tr)
 891         const int pri;
 892         const int proto_id;
 893         const struct satrns *tr;
 894 {
 895         if (tr == NULL)
 896                 return;
 897
 898         switch (proto_id) {
 899         case IPSECDOI_PROTO_IPSEC_AH:
 900                 plog(pri, LOCATION, NULL,
 901                         "  (trns_id=%s authtype=%s)\n",
 902                         s_ipsecdoi_trns(proto_id, tr->trns_id),
 903                         s_ipsecdoi_attr_v(IPSECDOI_ATTR_AUTH, tr->authtype));
 904                 break;
 905         case IPSECDOI_PROTO_IPSEC_ESP:
 906                 plog(pri, LOCATION, NULL,
 907                         "  (trns_id=%s encklen=%d authtype=%s)\n",
 908                         s_ipsecdoi_trns(proto_id, tr->trns_id),
 909                         tr->encklen,
 910                         s_ipsecdoi_attr_v(IPSECDOI_ATTR_AUTH, tr->authtype));
 911                 break;
 912         case IPSECDOI_PROTO_IPCOMP:
 913                 plog(pri, LOCATION, NULL,
 914                         "  (trns_id=%s)\n",
 915                         s_ipsecdoi_trns(proto_id, tr->trns_id));
 916                 break;
 917         default:
 918                 plog(pri, LOCATION, NULL,
 919                         "(unknown proto_id %d)\n", proto_id);
 920         }
 921
 922         return;
 923 }
 924
 925 void
 926 print_proppair0(pri, p, level)
 927         int pri;
 928         struct prop_pair *p;
 929         int level;
 930 {
 931         char spc[21];
 932
 933         memset(spc, ' ', sizeof(spc));
 934         spc[sizeof(spc) - 1] = '\0';
 935         if (level < 20) {
 936                 spc[level] = '\0';
 937         }
 938
 939         plog(pri, LOCATION, NULL,
 940                 "%s%p: next=%p tnext=%p\n", spc, p, p->next, p->tnext);
 941         if (p->next)
 942                 print_proppair0(pri, p->next, level + 1);
 943         if (p->tnext)
 944                 print_proppair0(pri, p->tnext, level + 1);
 945 }
 946
 947 void
 948 print_proppair(pri, p)
 949         int pri;
 950         struct prop_pair *p;
 951 {
 952         print_proppair0(pri, p, 1);
 953 }
 954
 955 int
 956 set_proposal_from_policy(iph2, sp_main, sp_sub)
 957         struct ph2handle *iph2;
 958         struct secpolicy *sp_main, *sp_sub;
 959 {
 960         struct saprop *newpp;
 961         struct ipsecrequest *req;
 962         int encmodesv = IPSEC_MODE_TRANSPORT; /* use only when complex_bundle */
 963
 964         newpp = newsaprop();
 965         if (newpp == NULL) {
 966                 plog(LLV_ERROR, LOCATION, NULL,
 967                         "failed to allocate saprop.\n");
 968                 goto err;
 969         }
 970         newpp->prop_no = 1;
 971         newpp->lifetime = iph2->sainfo->lifetime;
 972         newpp->lifebyte = iph2->sainfo->lifebyte;
 973         newpp->pfs_group = iph2->sainfo->pfs_group;
 974
 975         if (lcconf->complex_bundle)
 976                 goto skip1;
 977
 978         /*
 979          * decide the encryption mode of this SA bundle.
 980          * the mode becomes tunnel mode when there is even one policy
 981          * of tunnel mode in the SPD.  otherwise the mode becomes
 982          * transport mode.
 983          */
 984         encmodesv = IPSEC_MODE_TRANSPORT;
 985         for (req = sp_main->req; req; req = req->next) {
 986                 if (req->saidx.mode == IPSEC_MODE_TUNNEL) {
 987                         encmodesv = pfkey2ipsecdoi_mode(req->saidx.mode);
 988 #ifdef ENABLE_NATT
 989                         if (iph2->ph1 && (iph2->ph1->natt_flags & NAT_DETECTED))
 990                                 encmodesv += iph2->ph1->natt_options->mode_udp_diff;
 991 #endif
 992                         break;
 993                 }
 994         }
 995
 996     skip1:
 997         for (req = sp_main->req; req; req = req->next) {
 998                 struct saproto *newpr;
 999                 caddr_t paddr = NULL;
1000
1001                 /*
1002                  * check if SA bundle ?
1003                  * nested SAs negotiation is NOT supported.
1004                  *       me +--- SA1 ---+ peer1
1005                  *       me +--- SA2 --------------+ peer2
1006                  */
1007 #ifdef __linux__
1008                 if (req->saidx.src.ss_family && req->saidx.dst.ss_family) {
1009 #else
1010                 if (req->saidx.src.ss_len && req->saidx.dst.ss_len) {
1011 #endif
1012                         /* check the end of ip addresses of SA */
1013                         if (iph2->side == INITIATOR)
1014                                 paddr = (caddr_t)&req->saidx.dst;
1015                         else
1016                                 paddr = (caddr_t)&req->saidx.src;
1017                 }
1018
1019                 /* allocate ipsec sa protocol */
1020                 newpr = newsaproto();
1021                 if (newpr == NULL) {
1022                         plog(LLV_ERROR, LOCATION, NULL,
1023                                 "failed to allocate saproto.\n");
1024                         goto err;
1025                 }
1026
1027                 newpr->proto_id = ipproto2doi(req->saidx.proto);
1028                 if (newpr->proto_id == IPSECDOI_PROTO_IPCOMP)
1029                         newpr->spisize = 2;
1030                 else
1031                         newpr->spisize = 4;
1032                 if (lcconf->complex_bundle) {
1033                         newpr->encmode = pfkey2ipsecdoi_mode(req->saidx.mode);
1034 #ifdef ENABLE_NATT
1035                         if (iph2->ph1 && (iph2->ph1->natt_flags & NAT_DETECTED))
1036                                 newpr->encmode += iph2->ph1->natt_options->mode_udp_diff;
1037 #endif
1038                 }
1039                 else
1040                         newpr->encmode = encmodesv;
1041
1042                 if (iph2->side == INITIATOR)
1043                         newpr->reqid_out = req->saidx.reqid;
1044                 else
1045                         newpr->reqid_in = req->saidx.reqid;
1046
1047                 if (set_satrnsbysainfo(newpr, iph2->sainfo) < 0) {
1048                         plog(LLV_ERROR, LOCATION, NULL,
1049                                 "failed to get algorithms.\n");
1050                         goto err;
1051                 }
1052
1053                 /* set new saproto */
1054                 inssaprotorev(newpp, newpr);
1055         }
1056
1057         /* get reqid_in from inbound policy */
1058         if (sp_sub) {
1059                 struct saproto *pr;
1060
1061                 req = sp_sub->req;
1062                 pr = newpp->head;
1063                 while (req && pr) {
1064                         if (iph2->side == INITIATOR)
1065                                 pr->reqid_in = req->saidx.reqid;
1066                         else
1067                                 pr->reqid_out = req->saidx.reqid;
1068                         pr = pr->next;
1069                         req = req->next;
1070                 }
1071                 if (pr || req) {
1072                         plog(LLV_NOTIFY, LOCATION, NULL,
1073                                 "There is a difference "
1074                                 "between the in/out bound policies in SPD.\n");
1075                 }
1076         }
1077
1078         iph2->proposal = newpp;
1079
1080         printsaprop0(LLV_DEBUG, newpp);
1081
1082         return 0;
1083 err:
1084         return -1;
1085 }
1086
1087 /*
1088  * generate a policy from peer's proposal.
1089  * this function unconditionally chooses the first proposal the in SA payload
1090  * passed by peer.
1091  */
1092 int
1093 set_proposal_from_proposal(iph2)
1094         struct ph2handle *iph2;
1095 {
1096         struct saprop *newpp = NULL, *pp0, *pp_peer = NULL;
1097         struct saproto *newpr = NULL, *pr;
1098         struct prop_pair **pair;
1099         int error = -1;
1100         int i;
1101
1102         /* get proposal pair */
1103         pair = get_proppair(iph2->sa, IPSECDOI_TYPE_PH2);
1104         if (pair == NULL)
1105                 goto end;
1106
1107         /*
1108          * make my proposal according as the client proposal.
1109          * XXX assumed there is only one proposal even if it's the SA bundle.
1110          */
1111         for (i = 0; i < MAXPROPPAIRLEN; i++) {
1112                 if (pair[i] == NULL)
1113                         continue;
1114                 pp_peer = aproppair2saprop(pair[i]);
1115                 if (pp_peer == NULL)
1116                         goto end;
1117
1118                 pp0 = newsaprop();
1119                 if (pp0 == NULL) {
1120                         plog(LLV_ERROR, LOCATION, NULL,
1121                                 "failed to allocate saprop.\n");
1122                         goto end;
1123                 }
1124                 pp0->prop_no = 1;
1125                 pp0->lifetime = iph2->sainfo->lifetime;
1126                 pp0->lifebyte = iph2->sainfo->lifebyte;
1127                 pp0->pfs_group = iph2->sainfo->pfs_group;
1128
1129                 if (pp_peer->next != NULL) {
1130                         plog(LLV_ERROR, LOCATION, NULL,
1131                                 "pp_peer is inconsistency, ignore it.\n");
1132                         /*FALLTHROUGH*/
1133                 }
1134
1135                 for (pr = pp_peer->head; pr; pr = pr->next) {
1136
1137                         newpr = newsaproto();
1138                         if (newpr == NULL) {
1139                                 plog(LLV_ERROR, LOCATION, NULL,
1140                                     "failed to allocate saproto.\n");
1141                                 goto end;
1142                         }
1143                         newpr->proto_id = pr->proto_id;
1144                         newpr->spisize = pr->spisize;
1145                         newpr->encmode = pr->encmode;
1146                         newpr->spi = 0;
1147                         newpr->spi_p = pr->spi; /* copy peer's SPI */
1148                         newpr->reqid_in = 0;
1149                         newpr->reqid_out = 0;
1150                 }
1151
1152                 if (set_satrnsbysainfo(newpr, iph2->sainfo) < 0) {
1153                         plog(LLV_ERROR, LOCATION, NULL,
1154                                 "failed to get algorithms.\n");
1155                         goto end;
1156                 }
1157
1158                 inssaproto(pp0, newpr);
1159                 inssaprop(&newpp, pp0);
1160         }
1161
1162         plog(LLV_DEBUG, LOCATION, NULL, "make a proposal from peer's:\n");
1163         printsaprop0(LLV_DEBUG, newpp);
1164
1165         iph2->proposal = newpp;
1166
1167         error = 0;
1168
1169 end:
1170         if (error && newpp)
1171                 flushsaprop(newpp);
1172
1173         if (pp_peer)
1174                 flushsaprop(pp_peer);
1175         free_proppair(pair);
1176         return error;
1177 }
1178
1179 int
1180 tunnel_mode_prop(p)
1181         struct saprop *p;
1182 {
1183         struct saproto *pr;
1184
1185         for (pr = p->head; pr; pr = pr->next)
1186                 if (pr->encmode == IPSECDOI_ATTR_ENC_MODE_TUNNEL)
1187                         return 1;
1188         return 0;
1189 }