lib/libipsec/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 /*      $DragonFly: src/lib/libipsec/ipsec_dump_policy.c,v 1.3 2003/11/12 20:21:30 eirikn Exp $ */
   3 /*      $KAME: ipsec_dump_policy.c,v 1.11 2000/05/07 05:29:47 itojun Exp $      */
   4
   5 /*
   6  * Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the project nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <sys/types.h>
  35 #include <sys/param.h>
  36 #include <sys/socket.h>
  37
  38 #include <netkey/key_var.h>
  39 #include <netinet/in.h>
  40 #include <netinet6/ipsec.h>
  41
  42 #include <arpa/inet.h>
  43
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include <netdb.h>
  48
  49 #include "ipsec_strerror.h"
  50
  51 static const char *ipsp_dir_strs[] = {
  52         "any", "in", "out",
  53 };
  54
  55 static const char *ipsp_policy_strs[] = {
  56         "discard", "none", "ipsec", "entrust", "bypass",
  57 };
  58
  59 static char *ipsec_dump_ipsecrequest (char *, size_t,
  60         struct sadb_x_ipsecrequest *, size_t);
  61 static int set_addresses (char *, size_t, struct sockaddr *,
  62         struct sockaddr *);
  63 static char *set_address (char *, size_t, struct sockaddr *);
  64
  65 /*
  66  * policy is sadb_x_policy buffer.
  67  * Must call free() later.
  68  * When delimiter == NULL, alternatively ' '(space) is applied.
  69  */
  70 char *
  71 ipsec_dump_policy(policy, delimiter)
  72         caddr_t policy;
  73         char *delimiter;
  74 {
  75         struct sadb_x_policy *xpl = (struct sadb_x_policy *)policy;
  76         struct sadb_x_ipsecrequest *xisr;
  77         size_t off, buflen;
  78         char *buf;
  79         char isrbuf[1024];
  80         char *newbuf;
  81
  82         /* sanity check */
  83         if (policy == NULL)
  84                 return NULL;
  85         if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) {
  86                 __ipsec_errcode = EIPSEC_INVAL_EXTTYPE;
  87                 return NULL;
  88         }
  89
  90         /* set delimiter */
  91         if (delimiter == NULL)
  92                 delimiter = " ";
  93
  94         switch (xpl->sadb_x_policy_dir) {
  95         case IPSEC_DIR_ANY:
  96         case IPSEC_DIR_INBOUND:
  97         case IPSEC_DIR_OUTBOUND:
  98                 break;
  99         default:
 100                 __ipsec_errcode = EIPSEC_INVAL_DIR;
 101                 return NULL;
 102         }
 103
 104         switch (xpl->sadb_x_policy_type) {
 105         case IPSEC_POLICY_DISCARD:
 106         case IPSEC_POLICY_NONE:
 107         case IPSEC_POLICY_IPSEC:
 108         case IPSEC_POLICY_BYPASS:
 109         case IPSEC_POLICY_ENTRUST:
 110                 break;
 111         default:
 112                 __ipsec_errcode = EIPSEC_INVAL_POLICY;
 113                 return NULL;
 114         }
 115
 116         buflen = strlen(ipsp_dir_strs[xpl->sadb_x_policy_dir])
 117                 + 1     /* space */
 118                 + strlen(ipsp_policy_strs[xpl->sadb_x_policy_type])
 119                 + 1;    /* NUL */
 120
 121         if ((buf = malloc(buflen)) == NULL) {
 122                 __ipsec_errcode = EIPSEC_NO_BUFS;
 123                 return NULL;
 124         }
 125         snprintf(buf, buflen, "%s %s", ipsp_dir_strs[xpl->sadb_x_policy_dir],
 126             ipsp_policy_strs[xpl->sadb_x_policy_type]);
 127
 128         if (xpl->sadb_x_policy_type != IPSEC_POLICY_IPSEC) {
 129                 __ipsec_errcode = EIPSEC_NO_ERROR;
 130                 return buf;
 131         }
 132
 133         /* count length of buffer for use */
 134         off = sizeof(*xpl);
 135         while (off < PFKEY_EXTLEN(xpl)) {
 136                 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xpl + off);
 137                 off += xisr->sadb_x_ipsecrequest_len;
 138         }
 139
 140         /* validity check */
 141         if (off != PFKEY_EXTLEN(xpl)) {
 142                 __ipsec_errcode = EIPSEC_INVAL_SADBMSG;
 143                 free(buf);
 144                 return NULL;
 145         }
 146
 147         off = sizeof(*xpl);
 148         while (off < PFKEY_EXTLEN(xpl)) {
 149                 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xpl + off);
 150
 151                 if (ipsec_dump_ipsecrequest(isrbuf, sizeof(isrbuf), xisr,
 152                     PFKEY_EXTLEN(xpl) - off) == NULL) {
 153                         free(buf);
 154                         return NULL;
 155                 }
 156
 157                 buflen = strlen(buf) + strlen(delimiter) + strlen(isrbuf) + 1;
 158                 newbuf = (char *)realloc(buf, buflen);
 159                 if (newbuf == NULL) {
 160                         __ipsec_errcode = EIPSEC_NO_BUFS;
 161                         free(buf);
 162                         return NULL;
 163                 }
 164                 buf = newbuf;
 165                 snprintf(buf, buflen, "%s%s%s", buf, delimiter, isrbuf);
 166
 167                 off += xisr->sadb_x_ipsecrequest_len;
 168         }
 169
 170         __ipsec_errcode = EIPSEC_NO_ERROR;
 171         return buf;
 172 }
 173
 174 static char *
 175 ipsec_dump_ipsecrequest(buf, len, xisr, bound)
 176         char *buf;
 177         size_t len;
 178         struct sadb_x_ipsecrequest *xisr;
 179         size_t bound;   /* boundary */
 180 {
 181         const char *proto, *mode, *level;
 182         char abuf[NI_MAXHOST * 2 + 2];
 183
 184         if (xisr->sadb_x_ipsecrequest_len > bound) {
 185                 __ipsec_errcode = EIPSEC_INVAL_PROTO;
 186                 return NULL;
 187         }
 188
 189         switch (xisr->sadb_x_ipsecrequest_proto) {
 190         case IPPROTO_ESP:
 191                 proto = "esp";
 192                 break;
 193         case IPPROTO_AH:
 194                 proto = "ah";
 195                 break;
 196         case IPPROTO_IPCOMP:
 197                 proto = "ipcomp";
 198                 break;
 199         default:
 200                 __ipsec_errcode = EIPSEC_INVAL_PROTO;
 201                 return NULL;
 202         }
 203
 204         switch (xisr->sadb_x_ipsecrequest_mode) {
 205         case IPSEC_MODE_ANY:
 206                 mode = "any";
 207                 break;
 208         case IPSEC_MODE_TRANSPORT:
 209                 mode = "transport";
 210                 break;
 211         case IPSEC_MODE_TUNNEL:
 212                 mode = "tunnel";
 213                 break;
 214         default:
 215                 __ipsec_errcode = EIPSEC_INVAL_MODE;
 216                 return NULL;
 217         }
 218
 219         abuf[0] = '\0';
 220         if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) {
 221                 struct sockaddr *sa1, *sa2;
 222                 caddr_t p;
 223
 224                 p = (caddr_t)(xisr + 1);
 225                 sa1 = (struct sockaddr *)p;
 226                 sa2 = (struct sockaddr *)(p + sa1->sa_len);
 227                 if (sizeof(*xisr) + sa1->sa_len + sa2->sa_len !=
 228                     xisr->sadb_x_ipsecrequest_len) {
 229                         __ipsec_errcode = EIPSEC_INVAL_ADDRESS;
 230                         return NULL;
 231                 }
 232                 if (set_addresses(abuf, sizeof(abuf), sa1, sa2) != 0) {
 233                         __ipsec_errcode = EIPSEC_INVAL_ADDRESS;
 234                         return NULL;
 235                 }
 236         }
 237
 238         switch (xisr->sadb_x_ipsecrequest_level) {
 239         case IPSEC_LEVEL_DEFAULT:
 240                 level = "default";
 241                 break;
 242         case IPSEC_LEVEL_USE:
 243                 level = "use";
 244                 break;
 245         case IPSEC_LEVEL_REQUIRE:
 246                 level = "require";
 247                 break;
 248         case IPSEC_LEVEL_UNIQUE:
 249                 level = "unique";
 250                 break;
 251         default:
 252                 __ipsec_errcode = EIPSEC_INVAL_LEVEL;
 253                 return NULL;
 254         }
 255
 256         if (xisr->sadb_x_ipsecrequest_reqid == 0)
 257                 snprintf(buf, len, "%s/%s/%s/%s", proto, mode, abuf, level);
 258         else {
 259                 int ch;
 260
 261                 if (xisr->sadb_x_ipsecrequest_reqid > IPSEC_MANUAL_REQID_MAX)
 262                         ch = '#';
 263                 else
 264                         ch = ':';
 265                 snprintf(buf, len, "%s/%s/%s/%s%c%d", proto, mode, abuf, level,
 266                     ch, xisr->sadb_x_ipsecrequest_reqid);
 267         }
 268
 269         return buf;
 270 }
 271
 272 static int
 273 set_addresses(buf, len, sa1, sa2)
 274         char *buf;
 275         size_t len;
 276         struct sockaddr *sa1;
 277         struct sockaddr *sa2;
 278 {
 279         char tmp1[NI_MAXHOST], tmp2[NI_MAXHOST];
 280
 281         if (set_address(tmp1, sizeof(tmp1), sa1) == NULL ||
 282             set_address(tmp2, sizeof(tmp2), sa2) == NULL)
 283                 return -1;
 284         if (strlen(tmp1) + 1 + strlen(tmp2) + 1 > len)
 285                 return -1;
 286         snprintf(buf, len, "%s-%s", tmp1, tmp2);
 287         return 0;
 288 }
 289
 290 static char *
 291 set_address(buf, len, sa)
 292         char *buf;
 293         size_t len;
 294         struct sockaddr *sa;
 295 {
 296 #ifdef NI_WITHSCOPEID
 297         const int niflags = NI_NUMERICHOST | NI_WITHSCOPEID;
 298 #else
 299         const int niflags = NI_NUMERICHOST;
 300 #endif
 301
 302         if (len < 1)
 303                 return NULL;
 304         buf[0] = '\0';
 305         if (getnameinfo(sa, sa->sa_len, buf, len, NULL, 0, niflags) != 0)
 306                 return NULL;
 307         return buf;
 308 }