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(const vchar_t *src, const vchar_t *dst, const vchar_t *peer, int use_nat_addr)
  83 {
  84         struct sainfo *s = NULL;
  85         struct sainfo *anonymous = NULL;
  86         int pass = 1;
  87
  88         if (use_nat_addr && lcconf->ext_nat_id == NULL)
  89                 return NULL;
  90
  91         if (peer == NULL)
  92                 pass = 2;
  93     again:
  94         LIST_FOREACH(s, &sitree, chain) {
  95                 if (s->id_i != NULL) {
  96                         if (pass == 2)
  97                                 continue;
  98                         if (memcmp(peer->v, s->id_i->v, s->id_i->l) != 0)
  99                                 continue;
 100                 } else if (pass == 1)
 101                         continue;
 102                 if (s->idsrc == NULL) {
 103                         anonymous = s;
 104                         continue;
 105                 }
 106
 107                 /* anonymous ? */
 108                 if (src == NULL) {
 109                         if (anonymous != NULL)
 110                                 break;
 111                         continue;
 112                 }
 113
 114         // TODO: handle wildcard port numbers in the id
 115         if (memcmp(src->v, s->idsrc->v, s->idsrc->l) == 0) {
 116                         if (use_nat_addr) {
 117                                 if (memcmp(lcconf->ext_nat_id->v, s->iddst->v, s->iddst->l) == 0) {
 118                                         plogdump(ASL_LEVEL_DEBUG, lcconf->ext_nat_id->v, lcconf->ext_nat_id->l, "matched external nat address.\n");
 119                                         return s;
 120                                 }
 121                         } else if (memcmp(dst->v, s->iddst->v, s->iddst->l) == 0)
 122                                 return s;
 123                 }
 124         }
 125
 126         if (anonymous) {
 127                 plog(ASL_LEVEL_DEBUG,
 128                         "anonymous sainfo selected.\n");
 129         } else if (pass == 1) {
 130                 pass = 2;
 131                 goto again;
 132         }
 133
 134         return anonymous;
 135 }
 136
 137 /*
 138  * return matching entry.
 139  * no matching entry found and if there is anonymous entry, return it.
 140  * else return NULL.
 141  * XXX by each data type, should be changed to compare the buffer.
 142  */
 143 struct sainfo *
 144 getsainfo_by_dst_id(const vchar_t *dst, const vchar_t *peer)
 145 {
 146         struct sainfo *s = NULL;
 147         struct sainfo *anonymous = NULL;
 148
 149         plog(ASL_LEVEL_DEBUG, "getsainfo_by_dst_id - dst id:\n");
 150         if (dst != NULL)
 151                 plogdump(ASL_LEVEL_DEBUG, dst->v, dst->l, "getsainfo_by_dst_id - dst id:\n");
 152         else
 153                 return NULL;
 154
 155         LIST_FOREACH(s, &sitree, chain) {
 156                 if (s->idsrc != NULL) {
 157                         plogdump(ASL_LEVEL_DEBUG, s->idsrc->v, s->idsrc->l, "getsainfo_by_dst_id - sainfo id - src:\n");
 158                         plogdump(ASL_LEVEL_DEBUG, s->iddst->v, s->iddst->l, "getsainfo_by_dst_id - sainfo id - dst:\n");
 159                 } else {
 160                         plog(ASL_LEVEL_DEBUG, "getsainfo_by_dst_id - sainfo id = anonymous\n");
 161                 }
 162                 if (s->id_i != NULL) {
 163                         plogdump(ASL_LEVEL_DEBUG, s->id_i->v, s->id_i->l, "getsainfo_by_dst_id - sainfo id_i:\n");
 164                         if (peer == NULL)
 165                                 continue;
 166                         if (memcmp(peer->v, s->id_i->v, s->id_i->l) != 0)
 167                                 continue;
 168                 }
 169                 if (s->idsrc == NULL) {
 170                         anonymous = s;
 171                         continue;
 172                 }
 173
 174                 if (memcmp(dst->v, s->iddst->v, s->iddst->l) == 0)
 175                         return s;
 176         }
 177
 178         if (anonymous) {
 179                 plog(ASL_LEVEL_DEBUG,
 180                          "anonymous sainfo selected.\n");
 181         }
 182
 183         return anonymous;
 184 }
 185
 186
 187 struct sainfo *
 188 create_sainfo()
 189 {
 190         struct sainfo *new;
 191
 192         new = racoon_calloc(1, sizeof(*new));
 193         if (new == NULL)
 194                 return NULL;
 195
 196         new->lifetime = IPSECDOI_ATTR_SA_LD_SEC_DEFAULT;
 197         new->lifebyte = IPSECDOI_ATTR_SA_LD_KB_MAX;
 198         new->refcount = 1;
 199     new->in_list = 0;
 200
 201         return new;
 202 }
 203
 204
 205 void
 206 delsainfo(struct sainfo *si)
 207 {
 208         int i;
 209
 210         for (i = 0; i < MAXALGCLASS; i++)
 211                 delsainfoalg(si->algs[i]);
 212
 213         if (si->idsrc)
 214                 vfree(si->idsrc);
 215         if (si->iddst)
 216                 vfree(si->iddst);
 217
 218 #ifdef ENABLE_HYBRID
 219         if (si->group)
 220                 vfree(si->group);
 221 #endif
 222
 223         racoon_free(si);
 224 }
 225
 226 void
 227 inssainfo(struct sainfo *new)
 228 {
 229         LIST_INSERT_HEAD(&sitree, new, chain);
 230     new->in_list = 1;
 231 }
 232
 233 void
 234 remsainfo(struct sainfo *si)
 235 {
 236     if (si->in_list) {
 237         LIST_REMOVE(si, chain);
 238         si->in_list = 0;
 239     }
 240 }
 241
 242 // remove sainfos from linked list
 243 // if not used - delete it
 244 void
 245 flushsainfo()
 246 {
 247         struct sainfo *s, *next;
 248
 249         LIST_FOREACH_SAFE(s, &sitree, chain, next) {
 250                 if (s->dynamic == 0) {
 251             remsainfo(s);
 252             if (--(s->refcount) <= 0)
 253                 delsainfo(s);
 254                 }
 255         }
 256 }
 257
 258 // remove sainfos from linked list
 259 // if not used - delete it
 260 void
 261 flushsainfo_dynamic(u_int32_t addr)
 262 {
 263         struct sainfo *s, *next;
 264
 265         LIST_FOREACH_SAFE(s, &sitree, chain, next) {
 266                 if (s->dynamic == addr) {
 267             remsainfo(s);
 268             if (--(s->refcount) <= 0)
 269                 delsainfo(s);
 270                 }
 271         }
 272 }
 273
 274 void
 275 retain_sainfo(struct sainfo *si)
 276 {
 277         (si->refcount)++;
 278 }
 279
 280 void
 281 release_sainfo(struct sainfo *si)
 282 {
 283         if (--(si->refcount) <= 0) {
 284         remsainfo(si);
 285         delsainfo(si);
 286     }
 287 }
 288
 289 void
 290 initsainfo()
 291 {
 292         LIST_INIT(&sitree);
 293 }
 294
 295 struct sainfoalg *
 296 newsainfoalg()
 297 {
 298         struct sainfoalg *new;
 299
 300         new = racoon_calloc(1, sizeof(*new));
 301         if (new == NULL)
 302                 return NULL;
 303
 304         return new;
 305 }
 306
 307 void
 308 delsainfoalg(struct sainfoalg *alg)
 309 {
 310         struct sainfoalg *a, *next;
 311
 312         for (a = alg; a; a = next) {
 313                 next = a->next;
 314                 racoon_free(a);
 315         }
 316 }
 317
 318 void
 319 inssainfoalg(struct sainfoalg **head, struct sainfoalg *new)
 320 {
 321         struct sainfoalg *a;
 322
 323         for (a = *head; a && a->next; a = a->next)
 324                 ;
 325         if (a)
 326                 a->next = new;
 327         else
 328                 *head = new;
 329 }
 330
 331
 332
 333 const char *
 334 sainfo2str(const struct sainfo *si)
 335 {
 336     char *idsrc_str;
 337     char *iddst_str;
 338     char *idi_str;
 339         static char buf[256];
 340
 341         if (si->idsrc == NULL)
 342                 snprintf(buf, sizeof(buf), "anonymous");
 343         else {
 344         idsrc_str = ipsecdoi_id2str(si->idsrc);
 345         if (idsrc_str) {
 346             snprintf(buf, sizeof(buf), "%s", idsrc_str);
 347             racoon_free(idsrc_str);
 348         }
 349         iddst_str = ipsecdoi_id2str(si->iddst);
 350         if (iddst_str) {
 351             snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
 352                      " %s", iddst_str);
 353             racoon_free(iddst_str);
 354         }
 355         }
 356
 357         if (si->id_i != NULL) {
 358         idi_str = ipsecdoi_id2str(si->id_i);
 359         if (idi_str) {
 360             snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
 361                      " from %s", idi_str);
 362             racoon_free(idi_str);
 363         }
 364     }
 365
 366         return buf;
 367 }