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 1.4 2008/09/30 16:57:05 swildner 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(caddr_t policy, char *delimiter)
  72 {
  73         struct sadb_x_policy *xpl = (struct sadb_x_policy *)policy;
  74         struct sadb_x_ipsecrequest *xisr;
  75         size_t off, buflen;
  76         char *buf;
  77         char isrbuf[1024];
  78         char *newbuf;
  79
  80         /* sanity check */
  81         if (policy == NULL)
  82                 return NULL;
  83         if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) {
  84                 __ipsec_errcode = EIPSEC_INVAL_EXTTYPE;
  85                 return NULL;
  86         }
  87
  88         /* set delimiter */
  89         if (delimiter == NULL)
  90                 delimiter = " ";
  91
  92         switch (xpl->sadb_x_policy_dir) {
  93         case IPSEC_DIR_ANY:
  94         case IPSEC_DIR_INBOUND:
  95         case IPSEC_DIR_OUTBOUND:
  96                 break;
  97         default:
  98                 __ipsec_errcode = EIPSEC_INVAL_DIR;
  99                 return NULL;
 100         }
 101
 102         switch (xpl->sadb_x_policy_type) {
 103         case IPSEC_POLICY_DISCARD:
 104         case IPSEC_POLICY_NONE:
 105         case IPSEC_POLICY_IPSEC:
 106         case IPSEC_POLICY_BYPASS:
 107         case IPSEC_POLICY_ENTRUST:
 108                 break;
 109         default:
 110                 __ipsec_errcode = EIPSEC_INVAL_POLICY;
 111                 return NULL;
 112         }
 113
 114         buflen = strlen(ipsp_dir_strs[xpl->sadb_x_policy_dir])
 115                 + 1     /* space */
 116                 + strlen(ipsp_policy_strs[xpl->sadb_x_policy_type])
 117                 + 1;    /* NUL */
 118
 119         if ((buf = malloc(buflen)) == NULL) {
 120                 __ipsec_errcode = EIPSEC_NO_BUFS;
 121                 return NULL;
 122         }
 123         snprintf(buf, buflen, "%s %s", ipsp_dir_strs[xpl->sadb_x_policy_dir],
 124             ipsp_policy_strs[xpl->sadb_x_policy_type]);
 125
 126         if (xpl->sadb_x_policy_type != IPSEC_POLICY_IPSEC) {
 127                 __ipsec_errcode = EIPSEC_NO_ERROR;
 128                 return buf;
 129         }
 130
 131         /* count length of buffer for use */
 132         off = sizeof(*xpl);
 133         while (off < PFKEY_EXTLEN(xpl)) {
 134                 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xpl + off);
 135                 off += xisr->sadb_x_ipsecrequest_len;
 136         }
 137
 138         /* validity check */
 139         if (off != PFKEY_EXTLEN(xpl)) {
 140                 __ipsec_errcode = EIPSEC_INVAL_SADBMSG;
 141                 free(buf);
 142                 return NULL;
 143         }
 144
 145         off = sizeof(*xpl);
 146         while (off < PFKEY_EXTLEN(xpl)) {
 147                 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xpl + off);
 148
 149                 if (ipsec_dump_ipsecrequest(isrbuf, sizeof(isrbuf), xisr,
 150                     PFKEY_EXTLEN(xpl) - off) == NULL) {
 151                         free(buf);
 152                         return NULL;
 153                 }
 154
 155                 buflen = strlen(buf) + strlen(delimiter) + strlen(isrbuf) + 1;
 156                 newbuf = (char *)realloc(buf, buflen);
 157                 if (newbuf == NULL) {
 158                         __ipsec_errcode = EIPSEC_NO_BUFS;
 159                         free(buf);
 160                         return NULL;
 161                 }
 162                 buf = newbuf;
 163                 snprintf(buf, buflen, "%s%s%s", buf, delimiter, isrbuf);
 164
 165                 off += xisr->sadb_x_ipsecrequest_len;
 166         }
 167
 168         __ipsec_errcode = EIPSEC_NO_ERROR;
 169         return buf;
 170 }
 171
 172 static char *
 173 ipsec_dump_ipsecrequest(char *buf, size_t len,
 174     struct sadb_x_ipsecrequest *xisr, size_t bound)
 175 {
 176         const char *proto, *mode, *level;
 177         char abuf[NI_MAXHOST * 2 + 2];
 178
 179         if (xisr->sadb_x_ipsecrequest_len > bound) {
 180                 __ipsec_errcode = EIPSEC_INVAL_PROTO;
 181                 return NULL;
 182         }
 183
 184         switch (xisr->sadb_x_ipsecrequest_proto) {
 185         case IPPROTO_ESP:
 186                 proto = "esp";
 187                 break;
 188         case IPPROTO_AH:
 189                 proto = "ah";
 190                 break;
 191         case IPPROTO_IPCOMP:
 192                 proto = "ipcomp";
 193                 break;
 194         case IPPROTO_TCP:
 195                 proto = "tcp";
 196                 break;
 197         default:
 198                 __ipsec_errcode = EIPSEC_INVAL_PROTO;
 199                 return NULL;
 200         }
 201
 202         switch (xisr->sadb_x_ipsecrequest_mode) {
 203         case IPSEC_MODE_ANY:
 204                 mode = "any";
 205                 break;
 206         case IPSEC_MODE_TRANSPORT:
 207                 mode = "transport";
 208                 break;
 209         case IPSEC_MODE_TUNNEL:
 210                 mode = "tunnel";
 211                 break;
 212         default:
 213                 __ipsec_errcode = EIPSEC_INVAL_MODE;
 214                 return NULL;
 215         }
 216
 217         abuf[0] = '\0';
 218         if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) {
 219                 struct sockaddr *sa1, *sa2;
 220                 caddr_t p;
 221
 222                 p = (caddr_t)(xisr + 1);
 223                 sa1 = (struct sockaddr *)p;
 224                 sa2 = (struct sockaddr *)(p + sa1->sa_len);
 225                 if (sizeof(*xisr) + sa1->sa_len + sa2->sa_len !=
 226                     xisr->sadb_x_ipsecrequest_len) {
 227                         __ipsec_errcode = EIPSEC_INVAL_ADDRESS;
 228                         return NULL;
 229                 }
 230                 if (set_addresses(abuf, sizeof(abuf), sa1, sa2) != 0) {
 231                         __ipsec_errcode = EIPSEC_INVAL_ADDRESS;
 232                         return NULL;
 233                 }
 234         }
 235
 236         switch (xisr->sadb_x_ipsecrequest_level) {
 237         case IPSEC_LEVEL_DEFAULT:
 238                 level = "default";
 239                 break;
 240         case IPSEC_LEVEL_USE:
 241                 level = "use";
 242                 break;
 243         case IPSEC_LEVEL_REQUIRE:
 244                 level = "require";
 245                 break;
 246         case IPSEC_LEVEL_UNIQUE:
 247                 level = "unique";
 248                 break;
 249         default:
 250                 __ipsec_errcode = EIPSEC_INVAL_LEVEL;
 251                 return NULL;
 252         }
 253
 254         if (xisr->sadb_x_ipsecrequest_reqid == 0)
 255                 snprintf(buf, len, "%s/%s/%s/%s", proto, mode, abuf, level);
 256         else {
 257                 int ch;
 258
 259                 if (xisr->sadb_x_ipsecrequest_reqid > IPSEC_MANUAL_REQID_MAX)
 260                         ch = '#';
 261                 else
 262                         ch = ':';
 263                 snprintf(buf, len, "%s/%s/%s/%s%c%d", proto, mode, abuf, level,
 264                     ch, xisr->sadb_x_ipsecrequest_reqid);
 265         }
 266
 267         return buf;
 268 }
 269
 270 static int
 271 set_addresses(char *buf, size_t len, struct sockaddr *sa1, struct sockaddr *sa2)
 272 {
 273         char tmp1[NI_MAXHOST], tmp2[NI_MAXHOST];
 274
 275         if (set_address(tmp1, sizeof(tmp1), sa1) == NULL ||
 276             set_address(tmp2, sizeof(tmp2), sa2) == NULL)
 277                 return -1;
 278         if (strlen(tmp1) + 1 + strlen(tmp2) + 1 > len)
 279                 return -1;
 280         snprintf(buf, len, "%s-%s", tmp1, tmp2);
 281         return 0;
 282 }
 283
 284 static char *
 285 set_address(char *buf, size_t len, struct sockaddr *sa)
 286 {
 287 #ifdef NI_WITHSCOPEID
 288         const int niflags = NI_NUMERICHOST | NI_WITHSCOPEID;
 289 #else
 290         const int niflags = NI_NUMERICHOST;
 291 #endif
 292
 293         if (len < 1)
 294                 return NULL;
 295         buf[0] = '\0';
 296         if (getnameinfo(sa, sa->sa_len, buf, len, NULL, 0, niflags) != 0)
 297                 return NULL;
 298         return buf;
 299 }