crypto/asn1/a_time.c

   1 /*
   2  * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /*-
  11  * This is an implementation of the ASN1 Time structure which is:
  12  *    Time ::= CHOICE {
  13  *      utcTime        UTCTime,
  14  *      generalTime    GeneralizedTime }
  15  */
  16
  17 #include <stdio.h>
  18 #include <time.h>
  19 #include "internal/cryptlib.h"
  20 #include <openssl/asn1t.h>
  21 #include "asn1_locl.h"
  22
  23 IMPLEMENT_ASN1_MSTRING(ASN1_TIME, B_ASN1_TIME)
  24
  25 IMPLEMENT_ASN1_FUNCTIONS(ASN1_TIME)
  26
  27 ASN1_TIME *ASN1_TIME_set(ASN1_TIME *s, time_t t)
  28 {
  29     return ASN1_TIME_adj(s, t, 0, 0);
  30 }
  31
  32 ASN1_TIME *ASN1_TIME_adj(ASN1_TIME *s, time_t t,
  33                          int offset_day, long offset_sec)
  34 {
  35     struct tm *ts;
  36     struct tm data;
  37
  38     ts = OPENSSL_gmtime(&t, &data);
  39     if (ts == NULL) {
  40         ASN1err(ASN1_F_ASN1_TIME_ADJ, ASN1_R_ERROR_GETTING_TIME);
  41         return NULL;
  42     }
  43     if (offset_day || offset_sec) {
  44         if (!OPENSSL_gmtime_adj(ts, offset_day, offset_sec))
  45             return NULL;
  46     }
  47     if ((ts->tm_year >= 50) && (ts->tm_year < 150))
  48         return ASN1_UTCTIME_adj(s, t, offset_day, offset_sec);
  49     return ASN1_GENERALIZEDTIME_adj(s, t, offset_day, offset_sec);
  50 }
  51
  52 int ASN1_TIME_check(const ASN1_TIME *t)
  53 {
  54     if (t->type == V_ASN1_GENERALIZEDTIME)
  55         return ASN1_GENERALIZEDTIME_check(t);
  56     else if (t->type == V_ASN1_UTCTIME)
  57         return ASN1_UTCTIME_check(t);
  58     return 0;
  59 }
  60
  61 /* Convert an ASN1_TIME structure to GeneralizedTime */
  62 ASN1_GENERALIZEDTIME *ASN1_TIME_to_generalizedtime(const ASN1_TIME *t,
  63                                                    ASN1_GENERALIZEDTIME **out)
  64 {
  65     ASN1_GENERALIZEDTIME *ret = NULL;
  66     char *str;
  67     int newlen;
  68
  69     if (!ASN1_TIME_check(t))
  70         return NULL;
  71
  72     if (out == NULL || *out == NULL) {
  73         if ((ret = ASN1_GENERALIZEDTIME_new()) == NULL)
  74             goto err;
  75     } else
  76         ret = *out;
  77
  78     /* If already GeneralizedTime just copy across */
  79     if (t->type == V_ASN1_GENERALIZEDTIME) {
  80         if (!ASN1_STRING_set(ret, t->data, t->length))
  81             goto err;
  82         goto done;
  83     }
  84
  85     /* grow the string */
  86     if (!ASN1_STRING_set(ret, NULL, t->length + 2))
  87         goto err;
  88     /* ASN1_STRING_set() allocated 'len + 1' bytes. */
  89     newlen = t->length + 2 + 1;
  90     str = (char *)ret->data;
  91     /* Work out the century and prepend */
  92     if (t->data[0] >= '5')
  93         OPENSSL_strlcpy(str, "19", newlen);
  94     else
  95         OPENSSL_strlcpy(str, "20", newlen);
  96
  97     OPENSSL_strlcat(str, (const char *)t->data, newlen);
  98
  99  done:
 100    if (out != NULL && *out == NULL)
 101        *out = ret;
 102    return ret;
 103
 104  err:
 105     if (out == NULL || *out != ret)
 106         ASN1_GENERALIZEDTIME_free(ret);
 107     return NULL;
 108 }
 109
 110
 111 int ASN1_TIME_set_string(ASN1_TIME *s, const char *str)
 112 {
 113     ASN1_TIME t;
 114
 115     t.length = strlen(str);
 116     t.data = (unsigned char *)str;
 117     t.flags = 0;
 118
 119     t.type = V_ASN1_UTCTIME;
 120
 121     if (!ASN1_TIME_check(&t)) {
 122         t.type = V_ASN1_GENERALIZEDTIME;
 123         if (!ASN1_TIME_check(&t))
 124             return 0;
 125     }
 126
 127     if (s && !ASN1_STRING_copy((ASN1_STRING *)s, (ASN1_STRING *)&t))
 128         return 0;
 129
 130     return 1;
 131 }
 132
 133 static int asn1_time_to_tm(struct tm *tm, const ASN1_TIME *t)
 134 {
 135     if (t == NULL) {
 136         time_t now_t;
 137         time(&now_t);
 138         if (OPENSSL_gmtime(&now_t, tm))
 139             return 1;
 140         return 0;
 141     }
 142
 143     if (t->type == V_ASN1_UTCTIME)
 144         return asn1_utctime_to_tm(tm, t);
 145     else if (t->type == V_ASN1_GENERALIZEDTIME)
 146         return asn1_generalizedtime_to_tm(tm, t);
 147
 148     return 0;
 149 }
 150
 151 int ASN1_TIME_diff(int *pday, int *psec,
 152                    const ASN1_TIME *from, const ASN1_TIME *to)
 153 {
 154     struct tm tm_from, tm_to;
 155     if (!asn1_time_to_tm(&tm_from, from))
 156         return 0;
 157     if (!asn1_time_to_tm(&tm_to, to))
 158         return 0;
 159     return OPENSSL_gmtime_diff(pday, psec, &tm_from, &tm_to);
 160 }
 161
 162 int ASN1_TIME_print(BIO *bp, const ASN1_TIME *tm)
 163 {
 164     if (tm->type == V_ASN1_UTCTIME)
 165         return ASN1_UTCTIME_print(bp, tm);
 166     if (tm->type == V_ASN1_GENERALIZEDTIME)
 167         return ASN1_GENERALIZEDTIME_print(bp, tm);
 168     BIO_write(bp, "Bad time value", 14);
 169     return (0);
 170 }