a_utctm.c revision 69939df2891f62f7f00ff2ac275f1cd81a67454c 
1/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to.  The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 *    notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 *    notice, this list of conditions and the following disclaimer in the
29 *    documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 *    must display the following acknowledgement:
32 *    "This product includes cryptographic software written by
33 *     Eric Young (eay@cryptsoft.com)"
34 *    The word 'cryptographic' can be left out if the rouines from the library
35 *    being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 *    the apps directory (application code) you must include an acknowledgement:
38 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed.  i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57#include <openssl/asn1.h>
58
59#include <string.h>
60#include <time.h>
61
62#include <openssl/err.h>
63#include <openssl/mem.h>
64#include <openssl/time_support.h>
65
66#include "asn1_locl.h"
67
68
69int asn1_utctime_to_tm(struct tm *tm, const ASN1_UTCTIME *d)
70{
71    static const int min[8] = { 0, 1, 1, 0, 0, 0, 0, 0 };
72    static const int max[8] = { 99, 12, 31, 23, 59, 59, 12, 59 };
73    char *a;
74    int n, i, l, o;
75
76    if (d->type != V_ASN1_UTCTIME)
77        return (0);
78    l = d->length;
79    a = (char *)d->data;
80    o = 0;
81
82    if (l < 11)
83        goto err;
84    for (i = 0; i < 6; i++) {
85        if ((i == 5) && ((a[o] == 'Z') || (a[o] == '+') || (a[o] == '-'))) {
86            i++;
87            if (tm)
88                tm->tm_sec = 0;
89            break;
90        }
91        if ((a[o] < '0') || (a[o] > '9'))
92            goto err;
93        n = a[o] - '0';
94        if (++o > l)
95            goto err;
96
97        if ((a[o] < '0') || (a[o] > '9'))
98            goto err;
99        n = (n * 10) + a[o] - '0';
100        if (++o > l)
101            goto err;
102
103        if ((n < min[i]) || (n > max[i]))
104            goto err;
105        if (tm) {
106            switch (i) {
107            case 0:
108                tm->tm_year = n < 50 ? n + 100 : n;
109                break;
110            case 1:
111                tm->tm_mon = n - 1;
112                break;
113            case 2:
114                tm->tm_mday = n;
115                break;
116            case 3:
117                tm->tm_hour = n;
118                break;
119            case 4:
120                tm->tm_min = n;
121                break;
122            case 5:
123                tm->tm_sec = n;
124                break;
125            }
126        }
127    }
128    if (a[o] == 'Z')
129        o++;
130    else if ((a[o] == '+') || (a[o] == '-')) {
131        int offsign = a[o] == '-' ? -1 : 1, offset = 0;
132        o++;
133        if (o + 4 > l)
134            goto err;
135        for (i = 6; i < 8; i++) {
136            if ((a[o] < '0') || (a[o] > '9'))
137                goto err;
138            n = a[o] - '0';
139            o++;
140            if ((a[o] < '0') || (a[o] > '9'))
141                goto err;
142            n = (n * 10) + a[o] - '0';
143            if ((n < min[i]) || (n > max[i]))
144                goto err;
145            if (tm) {
146                if (i == 6)
147                    offset = n * 3600;
148                else if (i == 7)
149                    offset += n * 60;
150            }
151            o++;
152        }
153        if (offset && !OPENSSL_gmtime_adj(tm, 0, offset * offsign))
154            return 0;
155    }
156    return o == l;
157 err:
158    return 0;
159}
160
161int ASN1_UTCTIME_check(const ASN1_UTCTIME *d)
162{
163    return asn1_utctime_to_tm(NULL, d);
164}
165
166int ASN1_UTCTIME_set_string(ASN1_UTCTIME *s, const char *str)
167{
168    ASN1_UTCTIME t;
169
170    t.type = V_ASN1_UTCTIME;
171    t.length = strlen(str);
172    t.data = (unsigned char *)str;
173    if (ASN1_UTCTIME_check(&t)) {
174        if (s != NULL) {
175            if (!ASN1_STRING_set((ASN1_STRING *)s,
176                                 (unsigned char *)str, t.length))
177                return 0;
178            s->type = V_ASN1_UTCTIME;
179        }
180        return (1);
181    } else
182        return (0);
183}
184
185ASN1_UTCTIME *ASN1_UTCTIME_set(ASN1_UTCTIME *s, time_t t)
186{
187    return ASN1_UTCTIME_adj(s, t, 0, 0);
188}
189
190ASN1_UTCTIME *ASN1_UTCTIME_adj(ASN1_UTCTIME *s, time_t t,
191                               int offset_day, long offset_sec)
192{
193    char *p;
194    struct tm *ts;
195    struct tm data;
196    size_t len = 20;
197    int free_s = 0;
198
199    if (s == NULL) {
200        free_s = 1;
201        s = M_ASN1_UTCTIME_new();
202    }
203    if (s == NULL)
204        goto err;
205
206    ts = OPENSSL_gmtime(&t, &data);
207    if (ts == NULL)
208        goto err;
209
210    if (offset_day || offset_sec) {
211        if (!OPENSSL_gmtime_adj(ts, offset_day, offset_sec))
212            goto err;
213    }
214
215    if ((ts->tm_year < 50) || (ts->tm_year >= 150))
216        goto err;
217
218    p = (char *)s->data;
219    if ((p == NULL) || ((size_t)s->length < len)) {
220        p = OPENSSL_malloc(len);
221        if (p == NULL) {
222            OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
223            goto err;
224        }
225        if (s->data != NULL)
226            OPENSSL_free(s->data);
227        s->data = (unsigned char *)p;
228    }
229
230    BIO_snprintf(p, len, "%02d%02d%02d%02d%02d%02dZ", ts->tm_year % 100,
231                 ts->tm_mon + 1, ts->tm_mday, ts->tm_hour, ts->tm_min,
232                 ts->tm_sec);
233    s->length = strlen(p);
234    s->type = V_ASN1_UTCTIME;
235    return (s);
236 err:
237    if (free_s && s)
238        M_ASN1_UTCTIME_free(s);
239    return NULL;
240}
241
242int ASN1_UTCTIME_cmp_time_t(const ASN1_UTCTIME *s, time_t t)
243{
244    struct tm stm, ttm;
245    int day, sec;
246
247    if (!asn1_utctime_to_tm(&stm, s))
248        return -2;
249
250    if (!OPENSSL_gmtime(&t, &ttm))
251        return -2;
252
253    if (!OPENSSL_gmtime_diff(&day, &sec, &ttm, &stm))
254        return -2;
255
256    if (day > 0)
257        return 1;
258    if (day < 0)
259        return -1;
260    if (sec > 0)
261        return 1;
262    if (sec < 0)
263        return -1;
264    return 0;
265}
266
267#if 0
268time_t ASN1_UTCTIME_get(const ASN1_UTCTIME *s)
269{
270    struct tm tm;
271    int offset;
272
273    OPENSSL_memset(&tm, '\0', sizeof tm);
274
275# define g2(p) (((p)[0]-'0')*10+(p)[1]-'0')
276    tm.tm_year = g2(s->data);
277    if (tm.tm_year < 50)
278        tm.tm_year += 100;
279    tm.tm_mon = g2(s->data + 2) - 1;
280    tm.tm_mday = g2(s->data + 4);
281    tm.tm_hour = g2(s->data + 6);
282    tm.tm_min = g2(s->data + 8);
283    tm.tm_sec = g2(s->data + 10);
284    if (s->data[12] == 'Z')
285        offset = 0;
286    else {
287        offset = g2(s->data + 13) * 60 + g2(s->data + 15);
288        if (s->data[12] == '-')
289            offset = -offset;
290    }
291# undef g2
292
293    return mktime(&tm) - offset * 60; /* FIXME: mktime assumes the current
294                                       * timezone instead of UTC, and unless
295                                       * we rewrite OpenSSL in Lisp we cannot
296                                       * locally change the timezone without
297                                       * possibly interfering with other
298                                       * parts of the program. timegm, which
299                                       * uses UTC, is non-standard. Also
300                                       * time_t is inappropriate for general
301                                       * UTC times because it may a 32 bit
302                                       * type. */
303}
304#endif
305