/* $NetBSD: backupsa.c,v 1.8.4.1 2007/08/01 11:52:19 vanhu Exp $ */
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/* $KAME: backupsa.c,v 1.16 2001/12/31 20:13:40 thorpej Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "config.h"
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <netinet/in.h>
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#include PATH_IPSEC_H
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#if TIME_WITH_SYS_TIME
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# include <sys/time.h>
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# include <time.h>
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#else
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# if HAVE_SYS_TIME_H
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# include <sys/time.h>
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# else
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# include <time.h>
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# endif
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#endif
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#include "var.h"
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#include "misc.h"
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#include "vmbuf.h"
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#include "str2val.h"
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#include "plog.h"
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#include "debug.h"
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#include "localconf.h"
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#include "sockmisc.h"
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#include "safefile.h"
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#include "backupsa.h"
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#include "libpfkey.h"
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/*
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* (time string)%(sa parameter)
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* (time string) := ex. Nov 24 18:22:48 1986
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* (sa parameter) :=
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* src dst satype spi mode reqid wsize \
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* e_type e_keylen a_type a_keylen flags \
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* l_alloc l_bytes l_addtime l_usetime seq keymat
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*/
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static char *format = "%b %d %T %Y"; /* time format */
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static char *strmon[12] = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
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};
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static char *str2tmx __P((char *, struct tm *));
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static int str2num __P((char *, int));
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/*
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* output the sa parameter.
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*/
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int
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backupsa_to_file(sa_args)
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struct pfkey_send_sa_args *sa_args;
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{
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char buf[1024];
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struct tm *tm;
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time_t t;
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char *p, *k;
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int len, l, i;
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FILE *fp;
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p = buf;
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len = sizeof(buf);
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t = time(NULL);
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tm = localtime(&t);
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l = strftime(p, len, format, tm);
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p += l;
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len -= l;
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if (len < 0)
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goto err;
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l = snprintf(p, len, "%%");
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if (l < 0 || l >= len)
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goto err;
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p += l;
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len -= l;
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if (len < 0)
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goto err;
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i = getnameinfo(sa_args->src, sysdep_sa_len(sa_args->src), p, len, NULL, 0, NIFLAGS);
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if (i != 0)
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goto err;
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l = strlen(p);
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p += l;
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len -= l;
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if (len < 0)
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goto err;
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l = snprintf(p, len, " ");
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if (l < 0 || l >= len)
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goto err;
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p += l;
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len -= l;
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if (len < 0)
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goto err;
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i = getnameinfo(sa_args->dst, sysdep_sa_len(sa_args->dst), p, len, NULL, 0, NIFLAGS);
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if (i != 0)
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goto err;
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l = strlen(p);
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p += l;
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len -= l;
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if (len < 0)
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goto err;
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l = snprintf(p, len,
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" %u %lu %u %u %u "
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"%u %u %u %u %u "
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"%u %llu %llu %llu %u",
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sa_args->satype, (unsigned long)ntohl(sa_args->spi),
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sa_args->mode, sa_args->reqid, sa_args->wsize, sa_args->e_type,
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sa_args->e_keylen, sa_args->a_type, sa_args->a_keylen,
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sa_args->flags, sa_args->l_alloc,
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(unsigned long long)sa_args->l_bytes,
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(unsigned long long)sa_args->l_addtime,
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(unsigned long long)sa_args->l_usetime, sa_args->seq);
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if (l < 0 || l >= len)
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goto err;
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p += l;
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len -= l;
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if (len < 0)
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goto err;
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k = val2str(sa_args->keymat, sa_args->e_keylen + sa_args->a_keylen);
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l = snprintf(p, len, " %s", k);
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racoon_free(k);
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if (l < 0 || l >= len)
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goto err;
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p += l;
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len -= l;
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if (len < 0)
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goto err;
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/* open the file and write the SA parameter */
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if (safefile(lcconf->pathinfo[LC_PATHTYPE_BACKUPSA], 1) != 0 ||
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(fp = fopen(lcconf->pathinfo[LC_PATHTYPE_BACKUPSA], "a")) == NULL) {
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plog(LLV_ERROR, LOCATION, NULL,
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"failed to open the backup file %s.\n",
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lcconf->pathinfo[LC_PATHTYPE_BACKUPSA]);
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return -1;
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}
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fprintf(fp, "%s\n", buf);
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fclose(fp);
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return 0;
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err:
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plog(LLV_ERROR, LOCATION, NULL,
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"SA cannot be saved to a file.\n");
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return -1;
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}
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int
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backupsa_from_file()
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{
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FILE *fp;
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char buf[512];
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struct tm tm;
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time_t created, current;
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char *p, *q;
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size_t keymatlen;
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int line;
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struct pfkey_send_sa_args sa_args;
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memset(&sa_args, 0, sizeof(sa_args));
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if (safefile(lcconf->pathinfo[LC_PATHTYPE_BACKUPSA], 1) == 0)
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fp = fopen(lcconf->pathinfo[LC_PATHTYPE_BACKUPSA], "r");
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else
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fp = NULL;
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if (fp == NULL) {
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plog(LLV_ERROR, LOCATION, NULL,
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"failed to open the backup file %s.\n",
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lcconf->pathinfo[LC_PATHTYPE_BACKUPSA]);
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return -1;
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}
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current = time(NULL);
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for(line = 1; fgets(buf, sizeof(buf), fp) != NULL; line++) {
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/* comment line */
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if (buf[0] == '#')
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continue;
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memset(&tm, 0, sizeof(tm));
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p = str2tmx(buf, &tm);
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if (*p != '%') {
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err:
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plog(LLV_ERROR, LOCATION, NULL,
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"illegal format line#%d in %s: %s\n",
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line, lcconf->pathinfo[LC_PATHTYPE_BACKUPSA],
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buf);
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goto next;
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}
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created = mktime(&tm);
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p++;
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for (q = p; *q != '\0' && !isspace((int)*q); q++)
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;
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*q = '\0';
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if ((sa_args.src = str2saddr(p, NULL)) == NULL)
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goto next;
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p = q + 1;
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for (q = p; *q != '\0' && !isspace((int)*q); q++)
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;
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*q = '\0';
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if ((sa_args.dst = str2saddr(p, NULL)) == NULL)
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goto next;
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p = q + 1;
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#define GETNEXTNUM(value, function) \
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do { \
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char *y; \
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for (q = p; *q != '\0' && !isspace((int)*q); q++) \
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; \
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*q = '\0'; \
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(value) = function(p, &y, 10); \
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if ((value) == 0 && *y != '\0') \
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goto next; \
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p = q + 1; \
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} while (/*CONSTCOND*/0);
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GETNEXTNUM(sa_args.satype, strtoul);
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GETNEXTNUM(sa_args.spi, strtoul);
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sa_args.spi = ntohl(sa_args.spi);
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GETNEXTNUM(sa_args.mode, strtoul);
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GETNEXTNUM(sa_args.reqid, strtoul);
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GETNEXTNUM(sa_args.wsize, strtoul);
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GETNEXTNUM(sa_args.e_type, strtoul);
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GETNEXTNUM(sa_args.e_keylen, strtoul);
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GETNEXTNUM(sa_args.a_type, strtoul);
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GETNEXTNUM(sa_args.a_keylen, strtoul);
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GETNEXTNUM(sa_args.flags, strtoul);
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GETNEXTNUM(sa_args.l_alloc, strtoul);
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GETNEXTNUM(sa_args.l_bytes, strtouq);
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GETNEXTNUM(sa_args.l_addtime, strtouq);
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GETNEXTNUM(sa_args.l_usetime, strtouq);
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GETNEXTNUM(sa_args.seq, strtoul);
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#undef GETNEXTNUM
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sa_args.keymat = str2val(p, 16, &keymatlen);
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if (sa_args.keymat == NULL) {
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plog(LLV_ERROR, LOCATION, NULL,
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"illegal format(keymat) line#%d in %s: %s\n",
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line, lcconf->pathinfo[LC_PATHTYPE_BACKUPSA],
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buf);
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goto next;
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}
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if (created + sa_args.l_addtime < current) {
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plog(LLV_DEBUG, LOCATION, NULL,
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"ignore this line#%d in %s due to expiration\n",
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line, lcconf->pathinfo[LC_PATHTYPE_BACKUPSA]);
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goto next;
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}
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sa_args.l_addtime -= current - created;
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if (pfkey_send_add2(&sa_args) < 0) {
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plog(LLV_ERROR, LOCATION, NULL,
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"restore SA failed line#%d in %s: %s\n",
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line, lcconf->pathinfo[LC_PATHTYPE_BACKUPSA],
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ipsec_strerror());
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}
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next:
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if (sa_args.src != NULL) {
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racoon_free(sa_args.src);
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sa_args.src = NULL;
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}
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if (sa_args.dst != NULL) {
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racoon_free(sa_args.dst);
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sa_args.dst = NULL;
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}
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if (sa_args.keymat != NULL) {
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racoon_free(sa_args.keymat);
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sa_args.keymat = NULL;
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}
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}
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fclose(fp);
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/*
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* There is a possibility that an abnormal system down will happen
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* again before new negotiation will be started. so racoon clears
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* the backup file here. it's ok that old SAs are remained in the
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* file. any old SA will not be installed because racoon checks the
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* lifetime and compare with current time.
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*/
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return 0;
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}
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int
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backupsa_clean()
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{
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FILE *fp;
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/* simply return if the file is not defined. */
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if (!lcconf->pathinfo[LC_PATHTYPE_BACKUPSA])
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return 0;
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fp = fopen(lcconf->pathinfo[LC_PATHTYPE_BACKUPSA], "w+");
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if (fp == NULL) {
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plog(LLV_ERROR, LOCATION, NULL,
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"failed to clean the backup file %s.\n",
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lcconf->pathinfo[LC_PATHTYPE_BACKUPSA]);
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return -1;
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}
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fclose(fp);
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return 0;
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}
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/*
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* convert fixed string into the tm structure.
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* The fixed string is like 'Nov 24 18:22:48 1986'.
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* static char *format = "%b %d %T %Y";
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*/
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static char *
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str2tmx(char *p, struct tm *tm)
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{
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int i, len;
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/* Month */
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for (i = 0; i < sizeof(strmon)/sizeof(strmon[0]); i++) {
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if (strncasecmp(p, strmon[i], strlen(strmon[i])) == 0) {
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tm->tm_mon = i;
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break;
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}
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}
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if (i == sizeof(strmon)/sizeof(strmon[0]))
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return 0;
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p += strlen(strmon[i]);
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if (*p++ != ' ')
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return 0;
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/* Day */
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len = 2;
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tm->tm_mday = str2num(p, len);
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if (tm->tm_mday == -1 || tm->tm_mday > 31)
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return 0;
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p += len;
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if (*p++ != ' ')
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return 0;
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/* Hour */
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len = 2;
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tm->tm_hour = str2num(p, len);
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if (tm->tm_hour == -1 || tm->tm_hour > 24)
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return 0;
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p += len;
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if (*p++ != ':')
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return 0;
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/* Min */
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len = 2;
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tm->tm_min = str2num(p, len);
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if (tm->tm_min == -1 || tm->tm_min > 60)
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return 0;
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p += len;
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if (*p++ != ':')
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return 0;
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/* Sec */
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len = 2;
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tm->tm_sec = str2num(p, len);
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if (tm->tm_sec == -1 || tm->tm_sec > 60)
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return 0;
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p += len;
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if (*p++ != ' ')
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return 0;
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/* Year */
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len = 4;
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tm->tm_year = str2num(p, len);
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if (tm->tm_year == -1 || tm->tm_year < 1900)
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return 0;
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tm->tm_year -= 1900;
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p += len;
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return p;
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}
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static int
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str2num(p, len)
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char *p;
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int len;
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{
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int res, i;
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res = 0;
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for (i = len; i > 0; i--) {
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if (!isdigit((int)*p))
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return -1;
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res *= 10;
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res += *p - '0';
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p++;
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}
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return res;
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}
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#ifdef TEST
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#include <stdio.h>
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int
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main()
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{
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struct tm tm;
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time_t t;
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char *buf = "Nov 24 18:22:48 1986 ";
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char *p;
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memset(&tm, 0, sizeof(tm));
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p = str2tmx(buf, &tm);
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printf("[%x]\n", *p);
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t = mktime(&tm);
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if (t == -1)
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printf("mktime failed.");
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p = ctime(&t);
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printf("[%s]\n", p);
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exit(0);
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}
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#endif
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