/* $NetBSD: backupsa.c,v 1.10 2010/04/02 15:15:00 christos Exp $ */
/* $KAME: backupsa.c,v 1.16 2001/12/31 20:13:40 thorpej Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 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.
*/
#include "config.h"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <netinet/in.h>
#include PATH_IPSEC_H
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#include "var.h"
#include "misc.h"
#include "vmbuf.h"
#include "str2val.h"
#include "plog.h"
#include "debug.h"
#include "localconf.h"
#include "sockmisc.h"
#include "safefile.h"
#include "backupsa.h"
#include "libpfkey.h"
/*
* (time string)%(sa parameter)
* (time string) := ex. Nov 24 18:22:48 1986
* (sa parameter) :=
* src dst satype spi mode reqid wsize \
* e_type e_keylen a_type a_keylen flags \
* l_alloc l_bytes l_addtime l_usetime seq keymat
*/
static char *format = "%b %d %T %Y"; /* time format */
static char *strmon[12] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
static char *str2tmx __P((char *, struct tm *));
static int str2num __P((char *, int));
/*
* output the sa parameter.
*/
int
backupsa_to_file(sa_args)
struct pfkey_send_sa_args *sa_args;
{
char buf[1024];
struct tm *tm;
time_t t;
char *p, *k;
int len, l, i;
FILE *fp;
p = buf;
len = sizeof(buf);
t = time(NULL);
tm = localtime(&t);
l = strftime(p, len, format, tm);
p += l;
len -= l;
if (len < 0)
goto err;
l = snprintf(p, len, "%%");
if (l < 0 || l >= len)
goto err;
p += l;
len -= l;
if (len < 0)
goto err;
i = getnameinfo(sa_args->src, sysdep_sa_len(sa_args->src), p, len, NULL, 0, NIFLAGS);
if (i != 0)
goto err;
l = strlen(p);
p += l;
len -= l;
if (len < 0)
goto err;
l = snprintf(p, len, " ");
if (l < 0 || l >= len)
goto err;
p += l;
len -= l;
if (len < 0)
goto err;
i = getnameinfo(sa_args->dst, sysdep_sa_len(sa_args->dst), p, len, NULL, 0, NIFLAGS);
if (i != 0)
goto err;
l = strlen(p);
p += l;
len -= l;
if (len < 0)
goto err;
l = snprintf(p, len,
" %u %lu %u %u %u "
"%u %u %u %u %u "
"%u %llu %llu %llu %u",
sa_args->satype, (unsigned long)ntohl(sa_args->spi),
sa_args->mode, sa_args->reqid, sa_args->wsize, sa_args->e_type,
sa_args->e_keylen, sa_args->a_type, sa_args->a_keylen,
sa_args->flags, sa_args->l_alloc,
(unsigned long long)sa_args->l_bytes,
(unsigned long long)sa_args->l_addtime,
(unsigned long long)sa_args->l_usetime, sa_args->seq);
if (l < 0 || l >= len)
goto err;
p += l;
len -= l;
if (len < 0)
goto err;
k = val2str(sa_args->keymat, sa_args->e_keylen + sa_args->a_keylen);
l = snprintf(p, len, " %s", k);
racoon_free(k);
if (l < 0 || l >= len)
goto err;
p += l;
len -= l;
if (len < 0)
goto err;
/* open the file and write the SA parameter */
if (safefile(lcconf->pathinfo[LC_PATHTYPE_BACKUPSA], 1) != 0 ||
(fp = fopen(lcconf->pathinfo[LC_PATHTYPE_BACKUPSA], "a")) == NULL) {
plog(LLV_ERROR, LOCATION, NULL,
"failed to open the backup file %s.\n",
lcconf->pathinfo[LC_PATHTYPE_BACKUPSA]);
return -1;
}
fprintf(fp, "%s\n", buf);
fclose(fp);
return 0;
err:
plog(LLV_ERROR, LOCATION, NULL,
"SA cannot be saved to a file.\n");
return -1;
}
int
backupsa_from_file()
{
FILE *fp;
char buf[512];
struct tm tm;
time_t created, current;
char *p, *q;
size_t keymatlen;
int line;
struct pfkey_send_sa_args sa_args;
memset(&sa_args, 0, sizeof(sa_args));
if (safefile(lcconf->pathinfo[LC_PATHTYPE_BACKUPSA], 1) == 0)
fp = fopen(lcconf->pathinfo[LC_PATHTYPE_BACKUPSA], "r");
else
fp = NULL;
if (fp == NULL) {
plog(LLV_ERROR, LOCATION, NULL,
"failed to open the backup file %s.\n",
lcconf->pathinfo[LC_PATHTYPE_BACKUPSA]);
return -1;
}
current = time(NULL);
for(line = 1; fgets(buf, sizeof(buf), fp) != NULL; line++) {
/* comment line */
if (buf[0] == '#')
continue;
memset(&tm, 0, sizeof(tm));
p = str2tmx(buf, &tm);
if (*p != '%') {
err:
plog(LLV_ERROR, LOCATION, NULL,
"illegal format line#%d in %s: %s\n",
line, lcconf->pathinfo[LC_PATHTYPE_BACKUPSA],
buf);
goto next;
}
created = mktime(&tm);
p++;
for (q = p; *q != '\0' && !isspace((int)*q); q++)
;
*q = '\0';
if ((sa_args.src = str2saddr(p, NULL)) == NULL)
goto next;
p = q + 1;
for (q = p; *q != '\0' && !isspace((int)*q); q++)
;
*q = '\0';
if ((sa_args.dst = str2saddr(p, NULL)) == NULL)
goto next;
p = q + 1;
#define GETNEXTNUM(value, function) \
do { \
char *y; \
for (q = p; *q != '\0' && !isspace((int)*q); q++) \
; \
*q = '\0'; \
(value) = function(p, &y, 10); \
if ((value) == 0 && *y != '\0') \
goto next; \
p = q + 1; \
} while (/*CONSTCOND*/0);
GETNEXTNUM(sa_args.satype, strtoul);
GETNEXTNUM(sa_args.spi, strtoul);
sa_args.spi = ntohl(sa_args.spi);
GETNEXTNUM(sa_args.mode, strtoul);
GETNEXTNUM(sa_args.reqid, strtoul);
GETNEXTNUM(sa_args.wsize, strtoul);
GETNEXTNUM(sa_args.e_type, strtoul);
GETNEXTNUM(sa_args.e_keylen, strtoul);
GETNEXTNUM(sa_args.a_type, strtoul);
GETNEXTNUM(sa_args.a_keylen, strtoul);
GETNEXTNUM(sa_args.flags, strtoul);
GETNEXTNUM(sa_args.l_alloc, strtoul);
GETNEXTNUM(sa_args.l_bytes, strtouq);
GETNEXTNUM(sa_args.l_addtime, strtouq);
GETNEXTNUM(sa_args.l_usetime, strtouq);
GETNEXTNUM(sa_args.seq, strtoul);
#undef GETNEXTNUM
sa_args.keymat = str2val(p, 16, &keymatlen);
if (sa_args.keymat == NULL) {
plog(LLV_ERROR, LOCATION, NULL,
"illegal format(keymat) line#%d in %s: %s\n",
line, lcconf->pathinfo[LC_PATHTYPE_BACKUPSA],
buf);
goto next;
}
if (created + sa_args.l_addtime < current) {
plog(LLV_DEBUG, LOCATION, NULL,
"ignore this line#%d in %s due to expiration\n",
line, lcconf->pathinfo[LC_PATHTYPE_BACKUPSA]);
goto next;
}
sa_args.l_addtime -= current - created;
if (pfkey_send_add2(&sa_args) < 0) {
plog(LLV_ERROR, LOCATION, NULL,
"restore SA failed line#%d in %s: %s\n",
line, lcconf->pathinfo[LC_PATHTYPE_BACKUPSA],
ipsec_strerror());
}
next:
if (sa_args.src != NULL) {
racoon_free(sa_args.src);
sa_args.src = NULL;
}
if (sa_args.dst != NULL) {
racoon_free(sa_args.dst);
sa_args.dst = NULL;
}
if (sa_args.keymat != NULL) {
racoon_free(sa_args.keymat);
sa_args.keymat = NULL;
}
}
fclose(fp);
/*
* There is a possibility that an abnormal system down will happen
* again before new negotiation will be started. so racoon clears
* the backup file here. it's ok that old SAs are remained in the
* file. any old SA will not be installed because racoon checks the
* lifetime and compare with current time.
*/
return 0;
}
int
backupsa_clean()
{
FILE *fp;
/* simply return if the file is not defined. */
if (!lcconf->pathinfo[LC_PATHTYPE_BACKUPSA])
return 0;
fp = fopen(lcconf->pathinfo[LC_PATHTYPE_BACKUPSA], "w+");
if (fp == NULL) {
plog(LLV_ERROR, LOCATION, NULL,
"failed to clean the backup file %s.\n",
lcconf->pathinfo[LC_PATHTYPE_BACKUPSA]);
return -1;
}
fclose(fp);
return 0;
}
/*
* convert fixed string into the tm structure.
* The fixed string is like 'Nov 24 18:22:48 1986'.
* static char *format = "%b %d %T %Y";
*/
static char *
str2tmx(char *p, struct tm *tm)
{
int i, len;
/* Month */
for (i = 0; i < sizeof(strmon)/sizeof(strmon[0]); i++) {
if (strncasecmp(p, strmon[i], strlen(strmon[i])) == 0) {
tm->tm_mon = i;
break;
}
}
if (i == sizeof(strmon)/sizeof(strmon[0]))
return 0;
p += strlen(strmon[i]);
if (*p++ != ' ')
return 0;
/* Day */
len = 2;
tm->tm_mday = str2num(p, len);
if (tm->tm_mday == -1 || tm->tm_mday > 31)
return 0;
p += len;
if (*p++ != ' ')
return 0;
/* Hour */
len = 2;
tm->tm_hour = str2num(p, len);
if (tm->tm_hour == -1 || tm->tm_hour > 24)
return 0;
p += len;
if (*p++ != ':')
return 0;
/* Min */
len = 2;
tm->tm_min = str2num(p, len);
if (tm->tm_min == -1 || tm->tm_min > 60)
return 0;
p += len;
if (*p++ != ':')
return 0;
/* Sec */
len = 2;
tm->tm_sec = str2num(p, len);
if (tm->tm_sec == -1 || tm->tm_sec > 60)
return 0;
p += len;
if (*p++ != ' ')
return 0;
/* Year */
len = 4;
tm->tm_year = str2num(p, len);
if (tm->tm_year == -1 || tm->tm_year < 1900)
return 0;
tm->tm_year -= 1900;
p += len;
return p;
}
static int
str2num(p, len)
char *p;
int len;
{
int res, i;
res = 0;
for (i = len; i > 0; i--) {
if (!isdigit((int)*p))
return -1;
res *= 10;
res += *p - '0';
p++;
}
return res;
}
#ifdef TEST
#include <stdio.h>
int
main()
{
struct tm tm;
time_t t;
char *buf = "Nov 24 18:22:48 1986 ";
const char *p;
memset(&tm, 0, sizeof(tm));
p = str2tmx(buf, &tm);
printf("[%x]\n", *p);
t = mktime(&tm);
if (t == -1)
printf("mktime failed.");
if ((p = ctime(&t)) == NULL)
p = "?";
printf("[%s]\n", p);
exit(0);
}
#endif
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