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-rw-r--r--plugins/sudoers/gentime.c171
1 files changed, 171 insertions, 0 deletions
diff --git a/plugins/sudoers/gentime.c b/plugins/sudoers/gentime.c
new file mode 100644
index 0000000..43ff162
--- /dev/null
+++ b/plugins/sudoers/gentime.c
@@ -0,0 +1,171 @@
+/*
+ * 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);
+}