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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2017, 2021 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STDBOOL_H
# include <stdbool.h>
#else
# include <compat/stdbool.h>
#endif /* HAVE_STDBOOL_H */
#include <string.h>
#include <ctype.h>
#include <time.h>
#include <sudo_compat.h>
#include <sudoers_debug.h>
#include <parse.h>
/* Since timegm() is only used in one place we keep the macro local. */
#ifndef HAVE_TIMEGM
# define timegm(_t) sudo_timegm(_t)
#endif
/*
* Parse a timestamp in Generalized Time format as per RFC4517.
* E.g. yyyymmddHHMMSS.FZ or yyyymmddHHMMSS.F[+-]TZOFF
* where minutes, seconds and fraction are optional.
* Returns the time in Unix time format or -1 on error.
*/
time_t
parse_gentime(const char *timestr)
{
char tcopy[sizeof("yyyymmddHHMMSS")];
const char *cp;
time_t result;
struct tm tm;
size_t len;
int items, tzoff = 0;
bool islocal = false;
debug_decl(parse_gentime, SUDOERS_DEBUG_PARSER);
/* Make a copy of the non-fractional time without zone for easy parsing. */
len = strspn(timestr, "0123456789");
if (len >= sizeof(tcopy) || len < sizeof("yyyymmddHH") -1 || (len & 1)) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"unable to parse general time string %s", timestr);
debug_return_time_t(-1);
}
memcpy(tcopy, timestr, len);
tcopy[len] = '\0';
/* Parse general time, ignoring the timezone for now. */
memset(&tm, 0, sizeof(tm));
items = sscanf(tcopy, "%4d%2d%2d%2d%2d%2d", &tm.tm_year, &tm.tm_mon,
&tm.tm_mday, &tm.tm_hour, &tm.tm_min, &tm.tm_sec);
if (items == EOF || items < 4) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"only parsed %d items in general time string %s", items, timestr);
debug_return_time_t(-1);
}
/* Parse optional fractional hours/minute/second if present. */
cp = timestr + len;
if ((cp[0] == '.' || cp[0] == ',') && isdigit((unsigned char)cp[1])) {
int frac = cp[1] - '0';
switch (items) {
case 4:
/* convert fractional hour -> minutes */
tm.tm_min += 60 / 10 * frac;
break;
case 5:
/* convert fractional minute -> seconds */
tm.tm_sec += 60 / 10 * frac;
break;
case 6:
/* ignore fractional second */
break;
}
cp += 2; /* skip over radix and fraction */
}
/* Parse optional time zone. */
switch (*cp) {
case '-':
case '+': {
int hour = 0, min = 0;
/* No DST */
tm.tm_isdst = 0;
/* time zone offset must be hh or hhmm */
len = strspn(cp + 1, "0123456789");
if (len != 2 && len != 4) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"unable to parse time zone offset in %s, bad tz offset",
timestr);
debug_return_time_t(-1);
}
/* parse time zone offset */
items = sscanf(cp + 1, "%2d%2d", &hour, &min);
if (items == EOF || items < 1) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"unable to parse time zone offset in %s, items %d",
timestr, items);
debug_return_time_t(-1);
}
if (*cp == '-')
tzoff = -((hour * 60) + min) * 60;
else
tzoff = ((hour * 60) + min) * 60;
cp += 1 + (items * 2);
break;
}
case 'Z':
/* GMT/UTC, no DST */
tm.tm_isdst = 0;
cp++;
break;
case '\0':
/* no zone specified, use local time */
tm.tm_isdst = -1;
islocal = true;
break;
default:
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"unable to parse general time string %s", timestr);
debug_return_time_t(-1);
}
if (*cp != '\0') {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"trailing garbage in general time string %s", timestr);
debug_return_time_t(-1);
}
/* Adjust from Generalized Time to struct tm */
tm.tm_year -= 1900;
tm.tm_mon--;
if (islocal) {
result = mktime(&tm);
} else {
result = timegm(&tm);
if (result != -1) {
/* Adjust time based on supplied GMT offset. */
result -= tzoff;
}
}
debug_return_time_t(result);
}
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