mirror of
https://github.com/omar-polo/gmid.git
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178 lines
4.7 KiB
C
178 lines
4.7 KiB
C
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/* $OpenBSD: a_time_tm.c,v 1.15 2018/04/25 11:48:21 tb Exp $ */
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/*
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* Copyright (c) 2015 Bob Beck <beck@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "config.h"
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#include <ctype.h>
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#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#define GENTIME_LENGTH 15
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#define UTCTIME_LENGTH 13
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#define V_ASN1_UTCTIME 23
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#define V_ASN1_GENERALIZEDTIME 24
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#ifndef HAVE_ASN1_TIME_TM_CMP
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int
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ASN1_time_tm_cmp(struct tm *tm1, struct tm *tm2)
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{
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if (tm1->tm_year < tm2->tm_year)
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return (-1);
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if (tm1->tm_year > tm2->tm_year)
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return (1);
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if (tm1->tm_mon < tm2->tm_mon)
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return (-1);
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if (tm1->tm_mon > tm2->tm_mon)
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return (1);
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if (tm1->tm_mday < tm2->tm_mday)
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return (-1);
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if (tm1->tm_mday > tm2->tm_mday)
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return (1);
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if (tm1->tm_hour < tm2->tm_hour)
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return (-1);
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if (tm1->tm_hour > tm2->tm_hour)
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return (1);
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if (tm1->tm_min < tm2->tm_min)
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return (-1);
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if (tm1->tm_min > tm2->tm_min)
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return (1);
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if (tm1->tm_sec < tm2->tm_sec)
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return (-1);
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if (tm1->tm_sec > tm2->tm_sec)
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return (1);
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return 0;
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}
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#endif
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#ifndef HAVE_ASN1_TIME_TM_CLAMP_NOTAFTER
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int
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ASN1_time_tm_clamp_notafter(struct tm *tm)
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{
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#ifdef SMALL_TIME_T
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struct tm broken_os_epoch_tm;
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time_t broken_os_epoch_time = INT_MAX;
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if (gmtime_r(&broken_os_epoch_time, &broken_os_epoch_tm) == NULL)
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return 0;
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if (ASN1_time_tm_cmp(tm, &broken_os_epoch_tm) == 1)
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memcpy(tm, &broken_os_epoch_tm, sizeof(*tm));
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#endif
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return 1;
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}
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#endif
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/*
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* Parse an RFC 5280 format ASN.1 time string.
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*
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* mode must be:
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* 0 if we expect to parse a time as specified in RFC 5280 for an X509 object.
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* V_ASN1_UTCTIME if we wish to parse an RFC5280 format UTC time.
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* V_ASN1_GENERALIZEDTIME if we wish to parse an RFC5280 format Generalized time.
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*
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* Returns:
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* -1 if the string was invalid.
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* V_ASN1_UTCTIME if the string validated as a UTC time string.
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* V_ASN1_GENERALIZEDTIME if the string validated as a Generalized time string.
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*
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* Fills in *tm with the corresponding time if tm is non NULL.
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*/
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#ifndef HAVE_ASN1_TIME_PARSE
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#define ATOI2(ar) ((ar) += 2, ((ar)[-2] - '0') * 10 + ((ar)[-1] - '0'))
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int
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ASN1_time_parse(const char *bytes, size_t len, struct tm *tm, int mode)
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{
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size_t i;
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int type = 0;
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struct tm ltm;
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struct tm *lt;
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const char *p;
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if (bytes == NULL)
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return (-1);
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/* Constrain to valid lengths. */
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if (len != UTCTIME_LENGTH && len != GENTIME_LENGTH)
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return (-1);
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lt = tm;
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if (lt == NULL) {
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memset(<m, 0, sizeof(ltm));
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lt = <m;
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}
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/* Timezone is required and must be GMT (Zulu). */
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if (bytes[len - 1] != 'Z')
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return (-1);
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/* Make sure everything else is digits. */
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for (i = 0; i < len - 1; i++) {
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if (isdigit((unsigned char)bytes[i]))
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continue;
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return (-1);
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}
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/*
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* Validate and convert the time
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*/
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p = bytes;
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switch (len) {
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case GENTIME_LENGTH:
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if (mode == V_ASN1_UTCTIME)
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return (-1);
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lt->tm_year = (ATOI2(p) * 100) - 1900; /* cc */
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type = V_ASN1_GENERALIZEDTIME;
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/* FALLTHROUGH */
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case UTCTIME_LENGTH:
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if (type == 0) {
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if (mode == V_ASN1_GENERALIZEDTIME)
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return (-1);
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type = V_ASN1_UTCTIME;
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}
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lt->tm_year += ATOI2(p); /* yy */
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if (type == V_ASN1_UTCTIME) {
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if (lt->tm_year < 50)
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lt->tm_year += 100;
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}
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lt->tm_mon = ATOI2(p) - 1; /* mm */
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if (lt->tm_mon < 0 || lt->tm_mon > 11)
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return (-1);
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lt->tm_mday = ATOI2(p); /* dd */
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if (lt->tm_mday < 1 || lt->tm_mday > 31)
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return (-1);
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lt->tm_hour = ATOI2(p); /* HH */
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if (lt->tm_hour < 0 || lt->tm_hour > 23)
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return (-1);
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lt->tm_min = ATOI2(p); /* MM */
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if (lt->tm_min < 0 || lt->tm_min > 59)
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return (-1);
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lt->tm_sec = ATOI2(p); /* SS */
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/* Leap second 60 is not accepted. Reconsider later? */
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if (lt->tm_sec < 0 || lt->tm_sec > 59)
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return (-1);
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break;
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default:
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return (-1);
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}
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return (type);
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}
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#endif
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