ipsec-tools/racoon/sainfo.c

   1 /*      $KAME: sainfo.c,v 1.16 2003/06/27 07:32:39 sakane 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 #include <netinet/in.h>
  41 #ifdef HAVE_NETINET6_IPSEC
  42 #  include <netinet6/ipsec.h>
  43 #else
  44 #  include <netinet/ipsec.h>
  45 #endif
  46
  47 #include <stdlib.h>
  48 #include <stdio.h>
  49 #include <string.h>
  50 #include <errno.h>
  51
  52 #include "var.h"
  53 #include "misc.h"
  54 #include "vmbuf.h"
  55 #include "plog.h"
  56 #include "sockmisc.h"
  57 #include "debug.h"
  58
  59 #include "localconf.h"
  60 #include "isakmp_var.h"
  61 #include "isakmp.h"
  62 #include "ipsec_doi.h"
  63 #include "oakley.h"
  64 #include "handler.h"
  65 #include "algorithm.h"
  66 #include "sainfo.h"
  67 #include "gcmalloc.h"
  68
  69 static LIST_HEAD(_sitree, sainfo) sitree;
  70
  71 /* %%%
  72  * modules for ipsec sa info
  73  */
  74 /*
  75  * return matching entry.
  76  * no matching entry found and if there is anonymous entry, return it.
  77  * else return NULL.
  78  * XXX by each data type, should be changed to compare the buffer.
  79  * First pass is for sainfo from a specified peer, second for others.
  80  */
  81 struct sainfo *
  82 getsainfo(src, dst, peer, use_nat_addr)
  83         const vchar_t *src, *dst, *peer;
  84         int use_nat_addr;
  85 {
  86         struct sainfo *s = NULL;
  87         struct sainfo *anonymous = NULL;
  88         int pass = 1;
  89
  90         if (use_nat_addr && lcconf->ext_nat_id == NULL)
  91                 return NULL;
  92
  93         plog(LLV_DEBUG2, LOCATION, NULL, "getsainfo - src id:\n");
  94         if (src != NULL)
  95                 plogdump(LLV_DEBUG2, src->v, src->l);
  96         else
  97                 plog(LLV_DEBUG2, LOCATION, NULL, " anonymous\n");
  98         plog(LLV_DEBUG2, LOCATION, NULL, "getsainfo - dst id:\n");
  99         if (dst != NULL)
 100                 plogdump(LLV_DEBUG2, dst->v, dst->l);
 101         else
 102                 plog(LLV_DEBUG2, LOCATION, NULL, " anonymous\n");
 103         if (peer == NULL)
 104                 pass = 2;
 105     again:
 106         LIST_FOREACH(s, &sitree, chain) {
 107 #ifdef __APPLE__
 108                 if (s->to_delete || s->to_remove) {
 109                         continue;
 110                 }
 111 #endif /* __APPLE__ */
 112                 if (s->idsrc != NULL) {
 113                         plog(LLV_DEBUG2, LOCATION, NULL, "getsainfo - sainfo id - src & dst:\n");
 114                         plogdump(LLV_DEBUG2, s->idsrc->v, s->idsrc->l);
 115                         plogdump(LLV_DEBUG2, s->iddst->v, s->iddst->l);
 116                 } else {
 117                         plog(LLV_DEBUG2, LOCATION, NULL, "getsainfo - sainfo id = anonymous\n");
 118                 }
 119                 if (s->id_i != NULL) {
 120                         if (pass == 2)
 121                                 continue;
 122                         if (memcmp(peer->v, s->id_i->v, s->id_i->l) != 0)
 123                                 continue;
 124                 } else if (pass == 1)
 125                         continue;
 126                 if (s->idsrc == NULL) {
 127                         anonymous = s;
 128                         continue;
 129                 }
 130
 131                 /* anonymous ? */
 132                 if (src == NULL) {
 133                         if (anonymous != NULL)
 134                                 break;
 135                         continue;
 136                 }
 137
 138                 if (memcmp(src->v, s->idsrc->v, s->idsrc->l) == 0) {
 139                         if (use_nat_addr) {
 140                                 if (memcmp(lcconf->ext_nat_id->v, s->iddst->v, s->iddst->l) == 0) {
 141                                         plog(LLV_DEBUG, LOCATION, NULL,
 142                                                 "matched external nat address.\n");
 143                                         plogdump(LLV_DEBUG2, lcconf->ext_nat_id->v, lcconf->ext_nat_id->l);
 144                                         return s;
 145                                 }
 146                         } else if (memcmp(dst->v, s->iddst->v, s->iddst->l) == 0)
 147                                 return s;
 148                 }
 149         }
 150
 151         if (anonymous) {
 152                 plog(LLV_DEBUG, LOCATION, NULL,
 153                         "anonymous sainfo selected.\n");
 154         } else if (pass == 1) {
 155                 pass = 2;
 156                 goto again;
 157         }
 158
 159         return anonymous;
 160 }
 161
 162 #ifdef __APPLE__
 163 int
 164 link_sainfo_to_ph2 (struct sainfo *new)
 165 {
 166         if (!new) {
 167                 return(-1);
 168         }
 169         if (new->to_delete ||
 170                 new->to_remove) {
 171                 return(-1);
 172         }
 173         new->linked_to_ph2++;
 174         return(0);
 175 }
 176
 177 int
 178 unlink_sainfo_from_ph2 (struct sainfo *old)
 179 {
 180         if (!old) {
 181                 return(-1);
 182         }
 183         if (old->linked_to_ph2 <= 0) {
 184                 return(-1);
 185         }
 186         old->linked_to_ph2--;
 187         if (old->linked_to_ph2 == 0) {
 188                 if (old->to_remove) {
 189                         remsainfo(old);
 190                 }
 191                 if (old->to_delete) {
 192                         delsainfo(old);
 193                 }
 194         }
 195         return(0);
 196 }
 197 #endif
 198
 199 struct sainfo *
 200 newsainfo()
 201 {
 202         struct sainfo *new;
 203
 204         new = racoon_calloc(1, sizeof(*new));
 205         if (new == NULL)
 206                 return NULL;
 207
 208         new->lifetime = IPSECDOI_ATTR_SA_LD_SEC_DEFAULT;
 209         new->lifebyte = IPSECDOI_ATTR_SA_LD_KB_MAX;
 210 #ifdef __APPLE__
 211         new->to_remove = FALSE;
 212         new->to_delete = FALSE;
 213         new->linked_to_ph2 = 0;
 214 #endif
 215
 216         return new;
 217 }
 218
 219 void
 220 delsainfo(si)
 221         struct sainfo *si;
 222 {
 223         int i;
 224
 225 #ifdef __APPLE__
 226         if (si->linked_to_ph2) {
 227                 si->to_delete = TRUE;
 228                 return;
 229         }
 230 #endif
 231
 232         for (i = 0; i < MAXALGCLASS; i++)
 233                 delsainfoalg(si->algs[i]);
 234
 235         if (si->idsrc)
 236                 vfree(si->idsrc);
 237         if (si->iddst)
 238                 vfree(si->iddst);
 239
 240 #ifdef ENABLE_HYBRID
 241         if (si->group)
 242                 vfree(si->group);
 243 #endif
 244
 245         racoon_free(si);
 246 }
 247
 248 void
 249 inssainfo(new)
 250         struct sainfo *new;
 251 {
 252         LIST_INSERT_HEAD(&sitree, new, chain);
 253 }
 254
 255 void
 256 remsainfo(si)
 257         struct sainfo *si;
 258 {
 259 #ifdef __APPLE__
 260         if (si->linked_to_ph2) {
 261                 si->to_remove = TRUE;
 262                 return;
 263         }
 264 #endif
 265         LIST_REMOVE(si, chain);
 266 }
 267
 268 void
 269 flushsainfo()
 270 {
 271         struct sainfo *s, *next;
 272
 273         for (s = LIST_FIRST(&sitree); s; s = next) {
 274                 next = LIST_NEXT(s, chain);
 275                 if (s->dynamic == 0) {
 276                         remsainfo(s);
 277                         delsainfo(s);
 278                 }
 279         }
 280 }
 281
 282 void
 283 flushsainfo_dynamic(u_int32_t addr)
 284 {
 285         struct sainfo *s, *next;
 286
 287         for (s = LIST_FIRST(&sitree); s; s = next) {
 288                 next = LIST_NEXT(s, chain);
 289                 if (s->dynamic == addr) {
 290                         remsainfo(s);
 291                         delsainfo(s);
 292                 }
 293         }
 294 }
 295
 296 void
 297 initsainfo()
 298 {
 299         LIST_INIT(&sitree);
 300 }
 301
 302 struct sainfoalg *
 303 newsainfoalg()
 304 {
 305         struct sainfoalg *new;
 306
 307         new = racoon_calloc(1, sizeof(*new));
 308         if (new == NULL)
 309                 return NULL;
 310
 311         return new;
 312 }
 313
 314 void
 315 delsainfoalg(alg)
 316         struct sainfoalg *alg;
 317 {
 318         struct sainfoalg *a, *next;
 319
 320         for (a = alg; a; a = next) {
 321                 next = a->next;
 322                 racoon_free(a);
 323         }
 324 }
 325
 326 void
 327 inssainfoalg(head, new)
 328         struct sainfoalg **head;
 329         struct sainfoalg *new;
 330 {
 331         struct sainfoalg *a;
 332
 333         for (a = *head; a && a->next; a = a->next)
 334                 ;
 335         if (a)
 336                 a->next = new;
 337         else
 338                 *head = new;
 339 }
 340
 341 const char *
 342 sainfo2str(si)
 343         const struct sainfo *si;
 344 {
 345     char *idsrc_str;
 346     char *iddst_str;
 347     char *idi_str;
 348         static char buf[256];
 349
 350         if (si->idsrc == NULL)
 351                 snprintf(buf, sizeof(buf), "anonymous");
 352         else {
 353         idsrc_str = ipsecdoi_id2str(si->idsrc);
 354         if (idsrc_str) {
 355             snprintf(buf, sizeof(buf), "%s", idsrc_str);
 356             racoon_free(idsrc_str);
 357         }
 358         iddst_str = ipsecdoi_id2str(si->iddst);
 359         if (iddst_str) {
 360             snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
 361                      " %s", iddst_str);
 362             racoon_free(iddst_str);
 363         }
 364         }
 365
 366         if (si->id_i != NULL) {
 367         idi_str = ipsecdoi_id2str(si->id_i);
 368         if (idi_str) {
 369             snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
 370                      " from %s", idi_str);
 371             racoon_free(idi_str);
 372         }
 373     }
 374
 375         return buf;
 376 }