Logo Search packages:      
Sourcecode: ipsec-tools version File versions

ipsec_dump_policy.c

/* $Id: ipsec_dump_policy.c,v 1.7 2004/10/29 16:37:03 ludvigm Exp $ */

/*
 * Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>

#include <netinet/in.h>
#ifdef HAVE_NETINET6_IPSEC
#  include <netinet6/ipsec.h>
#else
#  include <netinet/ipsec.h>
#endif

#include <arpa/inet.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>

#include "ipsec_strerror.h"
#include "libpfkey.h"

static const char *ipsp_dir_strs[] = {
      "any", "in", "out", "fwd"
};

static const char *ipsp_policy_strs[] = {
      "discard", "none", "ipsec", "entrust", "bypass",
};

static char *ipsec_dump_ipsecrequest __P((char *, size_t,
      struct sadb_x_ipsecrequest *, size_t));
static int set_addresses __P((char *, size_t, struct sockaddr *,
      struct sockaddr *));
static char *set_address __P((char *, size_t, struct sockaddr *));

/*
 * policy is sadb_x_policy buffer.
 * Must call free() later.
 * When delimiter == NULL, alternatively ' '(space) is applied.
 */
char *
ipsec_dump_policy(policy, delimiter)
      caddr_t policy;
      char *delimiter;
{
      struct sadb_x_policy *xpl = (struct sadb_x_policy *)policy;
      struct sadb_x_ipsecrequest *xisr;
      size_t off, buflen;
      char *buf;
      char isrbuf[1024];
      char *newbuf;

#ifdef HAVE_PFKEY_POLICY_PRIORITY
      int32_t priority_offset;
      char *priority_str;
      char operator;
#endif

      /* sanity check */
      if (policy == NULL)
            return NULL;
      if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) {
            __ipsec_errcode = EIPSEC_INVAL_EXTTYPE;
            return NULL;
      }

      /* set delimiter */
      if (delimiter == NULL)
            delimiter = " ";

#ifdef HAVE_PFKEY_POLICY_PRIORITY
      if (xpl->sadb_x_policy_priority == 0)
      {
            priority_offset = 0;
            priority_str = "";
      }
      /* find which constant the priority is closest to */
      else if (xpl->sadb_x_policy_priority < 
               (u_int32_t) (PRIORITY_DEFAULT / 4) * 3)
      {
            priority_offset = xpl->sadb_x_policy_priority - PRIORITY_HIGH;
            priority_str = "prio high";
      }
      else if (xpl->sadb_x_policy_priority >= 
               (u_int32_t) (PRIORITY_DEFAULT / 4) * 3 &&
               xpl->sadb_x_policy_priority < 
               (u_int32_t) (PRIORITY_DEFAULT / 4) * 5)
      {
            priority_offset = xpl->sadb_x_policy_priority - PRIORITY_DEFAULT;
            priority_str = "prio def";
      }
      else
      {
            priority_offset = xpl->sadb_x_policy_priority - PRIORITY_LOW;
            priority_str = "prio low";
      }

      /* fix sign to match the way it is input */
      priority_offset *= -1;
      if (priority_offset < 0)
      {
            operator = '-';
            priority_offset *= -1;
      }
      else
      {
            operator = '+';
      }
#endif
      
      switch (xpl->sadb_x_policy_dir) {
      case IPSEC_DIR_ANY:
      case IPSEC_DIR_INBOUND:
      case IPSEC_DIR_OUTBOUND:
#ifdef HAVE_POLICY_FWD
      case IPSEC_DIR_FWD:
#endif
            break;
      default:
            __ipsec_errcode = EIPSEC_INVAL_DIR;
            return NULL;
      }

      switch (xpl->sadb_x_policy_type) {
      case IPSEC_POLICY_DISCARD:
      case IPSEC_POLICY_NONE:
      case IPSEC_POLICY_IPSEC:
      case IPSEC_POLICY_BYPASS:
      case IPSEC_POLICY_ENTRUST:
            break;
      default:
            __ipsec_errcode = EIPSEC_INVAL_POLICY;
            return NULL;
      }

      buflen = strlen(ipsp_dir_strs[xpl->sadb_x_policy_dir])
            + 1   /* space */
#ifdef HAVE_PFKEY_POLICY_PRIORITY
            + strlen(priority_str)
            + ((priority_offset != 0) ? 13 : 0) /* [space operator space int] */
            + ((strlen(priority_str) != 0) ? 1 : 0) /* space */
#endif
            + strlen(ipsp_policy_strs[xpl->sadb_x_policy_type])
            + 1;  /* NUL */

      if ((buf = malloc(buflen)) == NULL) {
            __ipsec_errcode = EIPSEC_NO_BUFS;
            return NULL;
      }
#ifdef HAVE_PFKEY_POLICY_PRIORITY
      if (priority_offset != 0)
      {
            snprintf(buf, buflen, "%s %s %c %u %s", 
            ipsp_dir_strs[xpl->sadb_x_policy_dir], priority_str, operator, 
                  priority_offset, ipsp_policy_strs[xpl->sadb_x_policy_type]);
      }
      else if (strlen (priority_str) != 0)
      {
            snprintf(buf, buflen, "%s %s %s", 
            ipsp_dir_strs[xpl->sadb_x_policy_dir], priority_str, 
                  ipsp_policy_strs[xpl->sadb_x_policy_type]);
      }
      else
      {
            snprintf(buf, buflen, "%s %s", 
            ipsp_dir_strs[xpl->sadb_x_policy_dir],
                  ipsp_policy_strs[xpl->sadb_x_policy_type]);
      }
#else
      snprintf(buf, buflen, "%s %s", ipsp_dir_strs[xpl->sadb_x_policy_dir],
          ipsp_policy_strs[xpl->sadb_x_policy_type]);
#endif

      if (xpl->sadb_x_policy_type != IPSEC_POLICY_IPSEC) {
            __ipsec_errcode = EIPSEC_NO_ERROR;
            return buf;
      }

      /* count length of buffer for use */
      off = sizeof(*xpl);
      while (off < PFKEY_EXTLEN(xpl)) {
            xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xpl + off);
            off += xisr->sadb_x_ipsecrequest_len;
      }

      /* validity check */
      if (off != PFKEY_EXTLEN(xpl)) {
            __ipsec_errcode = EIPSEC_INVAL_SADBMSG;
            free(buf);
            return NULL;
      }

      off = sizeof(*xpl);
      while (off < PFKEY_EXTLEN(xpl)) {
            int offset;
            xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xpl + off);

            if (ipsec_dump_ipsecrequest(isrbuf, sizeof(isrbuf), xisr,
                PFKEY_EXTLEN(xpl) - off) == NULL) {
                  free(buf);
                  return NULL;
            }

            offset = strlen(buf);
            buflen = offset + strlen(delimiter) + strlen(isrbuf) + 1;
            newbuf = (char *)realloc(buf, buflen);
            if (newbuf == NULL) {
                  __ipsec_errcode = EIPSEC_NO_BUFS;
                  free(buf);
                  return NULL;
            }
            buf = newbuf;
            snprintf(buf+offset, buflen-offset, "%s%s", delimiter, isrbuf);

            off += xisr->sadb_x_ipsecrequest_len;
      }

      __ipsec_errcode = EIPSEC_NO_ERROR;
      return buf;
}

static char *
ipsec_dump_ipsecrequest(buf, len, xisr, bound)
      char *buf;
      size_t len;
      struct sadb_x_ipsecrequest *xisr;
      size_t bound;     /* boundary */
{
      const char *proto, *mode, *level;
      char abuf[NI_MAXHOST * 2 + 2];

      if (xisr->sadb_x_ipsecrequest_len > bound) {
            __ipsec_errcode = EIPSEC_INVAL_PROTO;
            return NULL;
      }

      switch (xisr->sadb_x_ipsecrequest_proto) {
      case IPPROTO_ESP:
            proto = "esp";
            break;
      case IPPROTO_AH:
            proto = "ah";
            break;
      case IPPROTO_IPCOMP:
            proto = "ipcomp";
            break;
      default:
            __ipsec_errcode = EIPSEC_INVAL_PROTO;
            return NULL;
      }

      switch (xisr->sadb_x_ipsecrequest_mode) {
      case IPSEC_MODE_ANY:
            mode = "any";
            break;
      case IPSEC_MODE_TRANSPORT:
            mode = "transport";
            break;
      case IPSEC_MODE_TUNNEL:
            mode = "tunnel";
            break;
      default:
            __ipsec_errcode = EIPSEC_INVAL_MODE;
            return NULL;
      }

      abuf[0] = '\0';
      if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) {
            struct sockaddr *sa1, *sa2;
            caddr_t p;

            p = (caddr_t)(xisr + 1);
            sa1 = (struct sockaddr *)p;
            sa2 = (struct sockaddr *)(p + sysdep_sa_len(sa1));
            if (sizeof(*xisr) + sysdep_sa_len(sa1) + sysdep_sa_len(sa2) !=
                xisr->sadb_x_ipsecrequest_len) {
                  __ipsec_errcode = EIPSEC_INVAL_ADDRESS;
                  return NULL;
            }
            if (set_addresses(abuf, sizeof(abuf), sa1, sa2) != 0) {
                  __ipsec_errcode = EIPSEC_INVAL_ADDRESS;
                  return NULL;
            }
      }

      switch (xisr->sadb_x_ipsecrequest_level) {
      case IPSEC_LEVEL_DEFAULT:
            level = "default";
            break;
      case IPSEC_LEVEL_USE:
            level = "use";
            break;
      case IPSEC_LEVEL_REQUIRE:
            level = "require";
            break;
      case IPSEC_LEVEL_UNIQUE:
            level = "unique";
            break;
      default:
            __ipsec_errcode = EIPSEC_INVAL_LEVEL;
            return NULL;
      }

      if (xisr->sadb_x_ipsecrequest_reqid == 0)
            snprintf(buf, len, "%s/%s/%s/%s", proto, mode, abuf, level);
      else {
            int ch;

            if (xisr->sadb_x_ipsecrequest_reqid > IPSEC_MANUAL_REQID_MAX)
                  ch = '#';
            else
                  ch = ':';
            snprintf(buf, len, "%s/%s/%s/%s%c%u", proto, mode, abuf, level,
                ch, xisr->sadb_x_ipsecrequest_reqid);
      }

      return buf;
}

static int
set_addresses(buf, len, sa1, sa2)
      char *buf;
      size_t len;
      struct sockaddr *sa1;
      struct sockaddr *sa2;
{
      char tmp1[NI_MAXHOST], tmp2[NI_MAXHOST];

      if (set_address(tmp1, sizeof(tmp1), sa1) == NULL ||
          set_address(tmp2, sizeof(tmp2), sa2) == NULL)
            return -1;
      if (strlen(tmp1) + 1 + strlen(tmp2) + 1 > len)
            return -1;
      snprintf(buf, len, "%s-%s", tmp1, tmp2);
      return 0;
}

static char *
set_address(buf, len, sa)
      char *buf;
      size_t len;
      struct sockaddr *sa;
{
      const int niflags = NI_NUMERICHOST;

      if (len < 1)
            return NULL;
      buf[0] = '\0';
      if (getnameinfo(sa, sysdep_sa_len(sa), buf, len, NULL, 0, niflags) != 0)
            return NULL;
      return buf;
}

Generated by  Doxygen 1.6.0   Back to index