ipsec/ipsec_dump_policy.c

   1 /*      $FreeBSD: src/lib/libipsec/ipsec_dump_policy.c,v 1.1.2.1 2000/07/15 07:24:04 kris Exp $ */
   2 /*      $KAME: ipsec_dump_policy.c,v 1.11 2000/05/07 05:29:47 itojun Exp $      */
   3
   4 /*
   5  * Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <sys/types.h>
  34 #include <sys/param.h>
  35 #include <sys/socket.h>
  36
  37 #include <netkey/key_var.h>
  38 #include <netinet/in.h>
  39 #include <netinet6/ipsec.h>
  40
  41 #include <arpa/inet.h>
  42
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <netdb.h>
  47
  48 #include "ipsec_strerror.h"
  49
  50 static const char *ipsp_dir_strs[] = {
  51         "any", "in", "out",
  52 };
  53
  54 static const char *ipsp_policy_strs[] = {
  55         "discard", "none", "ipsec", "entrust", "bypass",
  56 };
  57
  58 static char *ipsec_dump_ipsecrequest __P((char *, size_t,
  59         struct sadb_x_ipsecrequest *, size_t));
  60 static int set_addresses __P((char *, size_t, struct sockaddr *,
  61         struct sockaddr *));
  62 static char *set_address __P((char *, size_t, struct sockaddr *));
  63
  64 /*
  65  * policy is sadb_x_policy buffer.
  66  * Must call free() later.
  67  * When delimiter == NULL, alternatively ' '(space) is applied.
  68  */
  69 char *
  70 ipsec_dump_policy(policy, delimiter)
  71         caddr_t policy;
  72         char *delimiter;
  73 {
  74         struct sadb_x_policy *xpl = (struct sadb_x_policy *)policy;
  75         struct sadb_x_ipsecrequest *xisr;
  76         size_t off, buflen;
  77         char *buf;
  78         char isrbuf[1024];
  79         char *newbuf;
  80
  81         /* sanity check */
  82         if (policy == NULL)
  83                 return NULL;
  84         if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) {
  85                 __ipsec_errcode = EIPSEC_INVAL_EXTTYPE;
  86                 return NULL;
  87         }
  88
  89         /* set delimiter */
  90         if (delimiter == NULL)
  91                 delimiter = " ";
  92
  93         switch (xpl->sadb_x_policy_dir) {
  94         case IPSEC_DIR_ANY:
  95         case IPSEC_DIR_INBOUND:
  96         case IPSEC_DIR_OUTBOUND:
  97                 break;
  98         default:
  99                 __ipsec_errcode = EIPSEC_INVAL_DIR;
 100                 return NULL;
 101         }
 102
 103         switch (xpl->sadb_x_policy_type) {
 104         case IPSEC_POLICY_DISCARD:
 105         case IPSEC_POLICY_NONE:
 106         case IPSEC_POLICY_IPSEC:
 107         case IPSEC_POLICY_BYPASS:
 108         case IPSEC_POLICY_ENTRUST:
 109                 break;
 110         default:
 111                 __ipsec_errcode = EIPSEC_INVAL_POLICY;
 112                 return NULL;
 113         }
 114
 115         buflen = strlen(ipsp_dir_strs[xpl->sadb_x_policy_dir])
 116                 + 1     /* space */
 117                 + strlen(ipsp_policy_strs[xpl->sadb_x_policy_type])
 118                 + 1;    /* NUL */
 119
 120         if ((buf = malloc(buflen)) == NULL) {
 121                 __ipsec_errcode = EIPSEC_NO_BUFS;
 122                 return NULL;
 123         }
 124         snprintf(buf, buflen, "%s %s", ipsp_dir_strs[xpl->sadb_x_policy_dir],
 125             ipsp_policy_strs[xpl->sadb_x_policy_type]);
 126
 127         if (xpl->sadb_x_policy_type != IPSEC_POLICY_IPSEC) {
 128                 __ipsec_errcode = EIPSEC_NO_ERROR;
 129                 return buf;
 130         }
 131
 132         /* count length of buffer for use */
 133         off = sizeof(*xpl);
 134         while (off < PFKEY_EXTLEN(xpl)) {
 135                 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xpl + off);
 136                 off += xisr->sadb_x_ipsecrequest_len;
 137         }
 138
 139         /* validity check */
 140         if (off != PFKEY_EXTLEN(xpl)) {
 141                 __ipsec_errcode = EIPSEC_INVAL_SADBMSG;
 142                 free(buf);
 143                 return NULL;
 144         }
 145
 146         off = sizeof(*xpl);
 147         while (off < PFKEY_EXTLEN(xpl)) {
 148                 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xpl + off);
 149
 150                 if (ipsec_dump_ipsecrequest(isrbuf, sizeof(isrbuf), xisr,
 151                     PFKEY_EXTLEN(xpl) - off) == NULL) {
 152                         free(buf);
 153                         return NULL;
 154                 }
 155
 156                 buflen = strlen(buf) + strlen(delimiter) + strlen(isrbuf) + 1;
 157                 newbuf = (char *)realloc(buf, buflen);
 158                 if (newbuf == NULL) {
 159                         __ipsec_errcode = EIPSEC_NO_BUFS;
 160                         free(buf);
 161                         return NULL;
 162                 }
 163                 buf = newbuf;
 164                 snprintf(buf, buflen, "%s%s%s", buf, delimiter, isrbuf);
 165
 166                 off += xisr->sadb_x_ipsecrequest_len;
 167         }
 168
 169         __ipsec_errcode = EIPSEC_NO_ERROR;
 170         return buf;
 171 }
 172
 173 static char *
 174 ipsec_dump_ipsecrequest(buf, len, xisr, bound)
 175         char *buf;
 176         size_t len;
 177         struct sadb_x_ipsecrequest *xisr;
 178         size_t bound;   /* boundary */
 179 {
 180         const char *proto, *mode, *level;
 181         char abuf[NI_MAXHOST * 2 + 2];
 182
 183         if (xisr->sadb_x_ipsecrequest_len > bound) {
 184                 __ipsec_errcode = EIPSEC_INVAL_PROTO;
 185                 return NULL;
 186         }
 187
 188         switch (xisr->sadb_x_ipsecrequest_proto) {
 189         case IPPROTO_ESP:
 190                 proto = "esp";
 191                 break;
 192         case IPPROTO_AH:
 193                 proto = "ah";
 194                 break;
 195         case IPPROTO_IPCOMP:
 196                 proto = "ipcomp";
 197                 break;
 198         default:
 199                 __ipsec_errcode = EIPSEC_INVAL_PROTO;
 200                 return NULL;
 201         }
 202
 203         switch (xisr->sadb_x_ipsecrequest_mode) {
 204         case IPSEC_MODE_ANY:
 205                 mode = "any";
 206                 break;
 207         case IPSEC_MODE_TRANSPORT:
 208                 mode = "transport";
 209                 break;
 210         case IPSEC_MODE_TUNNEL:
 211                 mode = "tunnel";
 212                 break;
 213         default:
 214                 __ipsec_errcode = EIPSEC_INVAL_MODE;
 215                 return NULL;
 216         }
 217
 218         abuf[0] = '\0';
 219         if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) {
 220                 struct sockaddr *sa1, *sa2;
 221                 caddr_t p;
 222
 223                 p = (caddr_t)(xisr + 1);
 224                 sa1 = (struct sockaddr *)p;
 225                 sa2 = (struct sockaddr *)(p + sa1->sa_len);
 226                 if (sizeof(*xisr) + sa1->sa_len + sa2->sa_len !=
 227                     xisr->sadb_x_ipsecrequest_len) {
 228                         __ipsec_errcode = EIPSEC_INVAL_ADDRESS;
 229                         return NULL;
 230                 }
 231                 if (set_addresses(abuf, sizeof(abuf), sa1, sa2) != 0) {
 232                         __ipsec_errcode = EIPSEC_INVAL_ADDRESS;
 233                         return NULL;
 234                 }
 235         }
 236
 237         switch (xisr->sadb_x_ipsecrequest_level) {
 238         case IPSEC_LEVEL_DEFAULT:
 239                 level = "default";
 240                 break;
 241         case IPSEC_LEVEL_USE:
 242                 level = "use";
 243                 break;
 244         case IPSEC_LEVEL_REQUIRE:
 245                 level = "require";
 246                 break;
 247         case IPSEC_LEVEL_UNIQUE:
 248                 level = "unique";
 249                 break;
 250         default:
 251                 __ipsec_errcode = EIPSEC_INVAL_LEVEL;
 252                 return NULL;
 253         }
 254
 255         if (xisr->sadb_x_ipsecrequest_reqid == 0)
 256                 snprintf(buf, len, "%s/%s/%s/%s", proto, mode, abuf, level);
 257         else {
 258                 int ch;
 259
 260                 if (xisr->sadb_x_ipsecrequest_reqid > IPSEC_MANUAL_REQID_MAX)
 261                         ch = '#';
 262                 else
 263                         ch = ':';
 264                 snprintf(buf, len, "%s/%s/%s/%s%c%d", proto, mode, abuf, level,
 265                     ch, xisr->sadb_x_ipsecrequest_reqid);
 266         }
 267
 268         return buf;
 269 }
 270
 271 static int
 272 set_addresses(buf, len, sa1, sa2)
 273         char *buf;
 274         size_t len;
 275         struct sockaddr *sa1;
 276         struct sockaddr *sa2;
 277 {
 278         char tmp1[NI_MAXHOST], tmp2[NI_MAXHOST];
 279
 280         if (set_address(tmp1, sizeof(tmp1), sa1) == NULL ||
 281             set_address(tmp2, sizeof(tmp2), sa2) == NULL)
 282                 return -1;
 283         if (strlen(tmp1) + 1 + strlen(tmp2) + 1 > len)
 284                 return -1;
 285         snprintf(buf, len, "%s-%s", tmp1, tmp2);
 286         return 0;
 287 }
 288
 289 static char *
 290 set_address(buf, len, sa)
 291         char *buf;
 292         size_t len;
 293         struct sockaddr *sa;
 294 {
 295 #ifdef NI_WITHSCOPEID
 296         const int niflags = NI_NUMERICHOST | NI_WITHSCOPEID;
 297 #else
 298         const int niflags = NI_NUMERICHOST;
 299 #endif
 300
 301         if (len < 1)
 302                 return NULL;
 303         buf[0] = '\0';
 304         if (getnameinfo(sa, sa->sa_len, buf, len, NULL, 0, niflags) != 0)
 305                 return NULL;
 306         return buf;
 307 }