| 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /*
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| 11 | * GENERALIZEDTIME implementation. Based on UTCTIME
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| 12 | */
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| 13 |
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| 14 | #include <stdio.h>
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| 15 | #include <time.h>
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| 16 | #include "internal/cryptlib.h"
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| 17 | #include <openssl/asn1.h>
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| 18 | #include "asn1_locl.h"
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| 19 |
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| 20 | int asn1_generalizedtime_to_tm(struct tm *tm, const ASN1_GENERALIZEDTIME *d)
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| 21 | {
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| 22 | static const int min[9] = { 0, 0, 1, 1, 0, 0, 0, 0, 0 };
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| 23 | static const int max[9] = { 99, 99, 12, 31, 23, 59, 59, 12, 59 };
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| 24 | char *a;
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| 25 | int n, i, l, o;
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| 26 |
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| 27 | if (d->type != V_ASN1_GENERALIZEDTIME)
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| 28 | return (0);
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| 29 | l = d->length;
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| 30 | a = (char *)d->data;
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| 31 | o = 0;
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| 32 | /*
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| 33 | * GENERALIZEDTIME is similar to UTCTIME except the year is represented
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| 34 | * as YYYY. This stuff treats everything as a two digit field so make
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| 35 | * first two fields 00 to 99
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| 36 | */
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| 37 | if (l < 13)
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| 38 | goto err;
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| 39 | for (i = 0; i < 7; i++) {
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| 40 | if ((i == 6) && ((a[o] == 'Z') || (a[o] == '+') || (a[o] == '-'))) {
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| 41 | i++;
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| 42 | if (tm)
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| 43 | tm->tm_sec = 0;
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| 44 | break;
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| 45 | }
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| 46 | if ((a[o] < '0') || (a[o] > '9'))
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| 47 | goto err;
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| 48 | n = a[o] - '0';
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| 49 | if (++o > l)
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| 50 | goto err;
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| 51 |
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| 52 | if ((a[o] < '0') || (a[o] > '9'))
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| 53 | goto err;
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| 54 | n = (n * 10) + a[o] - '0';
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| 55 | if (++o > l)
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| 56 | goto err;
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| 57 |
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| 58 | if ((n < min[i]) || (n > max[i]))
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| 59 | goto err;
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| 60 | if (tm) {
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| 61 | switch (i) {
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| 62 | case 0:
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| 63 | tm->tm_year = n * 100 - 1900;
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| 64 | break;
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| 65 | case 1:
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| 66 | tm->tm_year += n;
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| 67 | break;
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| 68 | case 2:
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| 69 | tm->tm_mon = n - 1;
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| 70 | break;
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| 71 | case 3:
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| 72 | tm->tm_mday = n;
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| 73 | break;
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| 74 | case 4:
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| 75 | tm->tm_hour = n;
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| 76 | break;
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| 77 | case 5:
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| 78 | tm->tm_min = n;
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| 79 | break;
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| 80 | case 6:
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| 81 | tm->tm_sec = n;
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| 82 | break;
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| 83 | }
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| 84 | }
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| 85 | }
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| 86 | /*
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| 87 | * Optional fractional seconds: decimal point followed by one or more
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| 88 | * digits.
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| 89 | */
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| 90 | if (a[o] == '.') {
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| 91 | if (++o > l)
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| 92 | goto err;
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| 93 | i = o;
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| 94 | while ((a[o] >= '0') && (a[o] <= '9') && (o <= l))
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| 95 | o++;
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| 96 | /* Must have at least one digit after decimal point */
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| 97 | if (i == o)
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| 98 | goto err;
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| 99 | }
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| 100 |
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| 101 | if (a[o] == 'Z')
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| 102 | o++;
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| 103 | else if ((a[o] == '+') || (a[o] == '-')) {
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| 104 | int offsign = a[o] == '-' ? 1 : -1, offset = 0;
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| 105 | o++;
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| 106 | if (o + 4 > l)
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| 107 | goto err;
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| 108 | for (i = 7; i < 9; i++) {
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| 109 | if ((a[o] < '0') || (a[o] > '9'))
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| 110 | goto err;
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| 111 | n = a[o] - '0';
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| 112 | o++;
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| 113 | if ((a[o] < '0') || (a[o] > '9'))
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| 114 | goto err;
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| 115 | n = (n * 10) + a[o] - '0';
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| 116 | if ((n < min[i]) || (n > max[i]))
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| 117 | goto err;
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| 118 | if (tm) {
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| 119 | if (i == 7)
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| 120 | offset = n * 3600;
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| 121 | else if (i == 8)
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| 122 | offset += n * 60;
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| 123 | }
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| 124 | o++;
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| 125 | }
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| 126 | if (offset && !OPENSSL_gmtime_adj(tm, 0, offset * offsign))
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| 127 | return 0;
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| 128 | } else if (a[o]) {
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| 129 | /* Missing time zone information. */
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| 130 | goto err;
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| 131 | }
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| 132 | return (o == l);
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| 133 | err:
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| 134 | return (0);
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| 135 | }
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| 136 |
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| 137 | int ASN1_GENERALIZEDTIME_check(const ASN1_GENERALIZEDTIME *d)
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| 138 | {
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| 139 | return asn1_generalizedtime_to_tm(NULL, d);
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| 140 | }
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| 141 |
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| 142 | int ASN1_GENERALIZEDTIME_set_string(ASN1_GENERALIZEDTIME *s, const char *str)
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| 143 | {
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| 144 | ASN1_GENERALIZEDTIME t;
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| 145 |
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| 146 | t.type = V_ASN1_GENERALIZEDTIME;
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| 147 | t.length = strlen(str);
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| 148 | t.data = (unsigned char *)str;
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| 149 | if (ASN1_GENERALIZEDTIME_check(&t)) {
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| 150 | if (s != NULL) {
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| 151 | if (!ASN1_STRING_set((ASN1_STRING *)s, str, t.length))
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| 152 | return 0;
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| 153 | s->type = V_ASN1_GENERALIZEDTIME;
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| 154 | }
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| 155 | return (1);
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| 156 | } else
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| 157 | return (0);
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| 158 | }
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| 159 |
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| 160 | ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_set(ASN1_GENERALIZEDTIME *s,
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| 161 | time_t t)
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| 162 | {
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| 163 | return ASN1_GENERALIZEDTIME_adj(s, t, 0, 0);
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| 164 | }
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| 165 |
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| 166 | ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_adj(ASN1_GENERALIZEDTIME *s,
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| 167 | time_t t, int offset_day,
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| 168 | long offset_sec)
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| 169 | {
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| 170 | char *p;
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| 171 | struct tm *ts;
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| 172 | struct tm data;
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| 173 | size_t len = 20;
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| 174 | ASN1_GENERALIZEDTIME *tmps = NULL;
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| 175 |
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| 176 | if (s == NULL)
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| 177 | tmps = ASN1_GENERALIZEDTIME_new();
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| 178 | else
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| 179 | tmps = s;
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| 180 | if (tmps == NULL)
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| 181 | return NULL;
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| 182 |
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| 183 | ts = OPENSSL_gmtime(&t, &data);
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| 184 | if (ts == NULL)
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| 185 | goto err;
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| 186 |
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| 187 | if (offset_day || offset_sec) {
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| 188 | if (!OPENSSL_gmtime_adj(ts, offset_day, offset_sec))
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| 189 | goto err;
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| 190 | }
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| 191 |
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| 192 | p = (char *)tmps->data;
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| 193 | if ((p == NULL) || ((size_t)tmps->length < len)) {
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| 194 | p = OPENSSL_malloc(len);
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| 195 | if (p == NULL) {
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| 196 | ASN1err(ASN1_F_ASN1_GENERALIZEDTIME_ADJ, ERR_R_MALLOC_FAILURE);
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| 197 | goto err;
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| 198 | }
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| 199 | OPENSSL_free(tmps->data);
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| 200 | tmps->data = (unsigned char *)p;
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| 201 | }
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| 202 |
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| 203 | BIO_snprintf(p, len, "%04d%02d%02d%02d%02d%02dZ", ts->tm_year + 1900,
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| 204 | ts->tm_mon + 1, ts->tm_mday, ts->tm_hour, ts->tm_min,
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| 205 | ts->tm_sec);
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| 206 | tmps->length = strlen(p);
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| 207 | tmps->type = V_ASN1_GENERALIZEDTIME;
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| 208 | #ifdef CHARSET_EBCDIC_not
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| 209 | ebcdic2ascii(tmps->data, tmps->data, tmps->length);
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| 210 | #endif
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| 211 | return tmps;
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| 212 | err:
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| 213 | if (s == NULL)
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| 214 | ASN1_GENERALIZEDTIME_free(tmps);
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| 215 | return NULL;
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| 216 | }
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| 217 |
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| 218 | const char *_asn1_mon[12] = {
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| 219 | "Jan", "Feb", "Mar", "Apr", "May", "Jun",
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| 220 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
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| 221 | };
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| 222 |
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| 223 | int ASN1_GENERALIZEDTIME_print(BIO *bp, const ASN1_GENERALIZEDTIME *tm)
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| 224 | {
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| 225 | char *v;
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| 226 | int gmt = 0;
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| 227 | int i;
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| 228 | int y = 0, M = 0, d = 0, h = 0, m = 0, s = 0;
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| 229 | char *f = NULL;
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| 230 | int f_len = 0;
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| 231 |
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| 232 | i = tm->length;
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| 233 | v = (char *)tm->data;
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| 234 |
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| 235 | if (i < 12)
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| 236 | goto err;
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| 237 | if (v[i - 1] == 'Z')
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| 238 | gmt = 1;
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| 239 | for (i = 0; i < 12; i++)
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| 240 | if ((v[i] > '9') || (v[i] < '0'))
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| 241 | goto err;
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| 242 | y = (v[0] - '0') * 1000 + (v[1] - '0') * 100
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| 243 | + (v[2] - '0') * 10 + (v[3] - '0');
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| 244 | M = (v[4] - '0') * 10 + (v[5] - '0');
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| 245 | if ((M > 12) || (M < 1))
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| 246 | goto err;
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| 247 | d = (v[6] - '0') * 10 + (v[7] - '0');
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| 248 | h = (v[8] - '0') * 10 + (v[9] - '0');
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| 249 | m = (v[10] - '0') * 10 + (v[11] - '0');
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| 250 | if (tm->length >= 14 &&
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| 251 | (v[12] >= '0') && (v[12] <= '9') &&
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| 252 | (v[13] >= '0') && (v[13] <= '9')) {
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| 253 | s = (v[12] - '0') * 10 + (v[13] - '0');
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| 254 | /* Check for fractions of seconds. */
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| 255 | if (tm->length >= 15 && v[14] == '.') {
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| 256 | int l = tm->length;
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| 257 | f = &v[14]; /* The decimal point. */
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| 258 | f_len = 1;
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| 259 | while (14 + f_len < l && f[f_len] >= '0' && f[f_len] <= '9')
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| 260 | ++f_len;
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| 261 | }
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| 262 | }
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| 263 |
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| 264 | if (BIO_printf(bp, "%s %2d %02d:%02d:%02d%.*s %d%s",
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| 265 | _asn1_mon[M - 1], d, h, m, s, f_len, f, y,
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| 266 | (gmt) ? " GMT" : "") <= 0)
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| 267 | return (0);
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| 268 | else
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| 269 | return (1);
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| 270 | err:
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| 271 | BIO_write(bp, "Bad time value", 14);
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| 272 | return (0);
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| 273 | }
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