a_utctm.c revision 325335 
1/* crypto/asn1/a_utctm.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to.  The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 *    notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in the
30 *    documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 *    must display the following acknowledgement:
33 *    "This product includes cryptographic software written by
34 *     Eric Young (eay@cryptsoft.com)"
35 *    The word 'cryptographic' can be left out if the rouines from the library
36 *    being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 *    the apps directory (application code) you must include an acknowledgement:
39 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#include <stdio.h>
60#include <time.h>
61#include "cryptlib.h"
62#include "o_time.h"
63#include <openssl/asn1.h>
64#include "asn1_locl.h"
65
66#if 0
67int i2d_ASN1_UTCTIME(ASN1_UTCTIME *a, unsigned char **pp)
68{
69# ifndef CHARSET_EBCDIC
70    return (i2d_ASN1_bytes((ASN1_STRING *)a, pp,
71                           V_ASN1_UTCTIME, V_ASN1_UNIVERSAL));
72# else
73    /* KLUDGE! We convert to ascii before writing DER */
74    int len;
75    char tmp[24];
76    ASN1_STRING x = *(ASN1_STRING *)a;
77
78    len = x.length;
79    ebcdic2ascii(tmp, x.data, (len >= sizeof tmp) ? sizeof tmp : len);
80    x.data = tmp;
81    return i2d_ASN1_bytes(&x, pp, V_ASN1_UTCTIME, V_ASN1_UNIVERSAL);
82# endif
83}
84
85ASN1_UTCTIME *d2i_ASN1_UTCTIME(ASN1_UTCTIME **a, unsigned char **pp,
86                               long length)
87{
88    ASN1_UTCTIME *ret = NULL;
89
90    ret = (ASN1_UTCTIME *)d2i_ASN1_bytes((ASN1_STRING **)a, pp, length,
91                                         V_ASN1_UTCTIME, V_ASN1_UNIVERSAL);
92    if (ret == NULL) {
93        ASN1err(ASN1_F_D2I_ASN1_UTCTIME, ERR_R_NESTED_ASN1_ERROR);
94        return (NULL);
95    }
96# ifdef CHARSET_EBCDIC
97    ascii2ebcdic(ret->data, ret->data, ret->length);
98# endif
99    if (!ASN1_UTCTIME_check(ret)) {
100        ASN1err(ASN1_F_D2I_ASN1_UTCTIME, ASN1_R_INVALID_TIME_FORMAT);
101        goto err;
102    }
103
104    return (ret);
105 err:
106    if ((ret != NULL) && ((a == NULL) || (*a != ret)))
107        M_ASN1_UTCTIME_free(ret);
108    return (NULL);
109}
110
111#endif
112
113int asn1_utctime_to_tm(struct tm *tm, const ASN1_UTCTIME *d)
114{
115    static const int min[8] = { 0, 1, 1, 0, 0, 0, 0, 0 };
116    static const int max[8] = { 99, 12, 31, 23, 59, 59, 12, 59 };
117    char *a;
118    int n, i, l, o;
119
120    if (d->type != V_ASN1_UTCTIME)
121        return (0);
122    l = d->length;
123    a = (char *)d->data;
124    o = 0;
125
126    if (l < 11)
127        goto err;
128    for (i = 0; i < 6; i++) {
129        if ((i == 5) && ((a[o] == 'Z') || (a[o] == '+') || (a[o] == '-'))) {
130            i++;
131            if (tm)
132                tm->tm_sec = 0;
133            break;
134        }
135        if ((a[o] < '0') || (a[o] > '9'))
136            goto err;
137        n = a[o] - '0';
138        if (++o > l)
139            goto err;
140
141        if ((a[o] < '0') || (a[o] > '9'))
142            goto err;
143        n = (n * 10) + a[o] - '0';
144        if (++o > l)
145            goto err;
146
147        if ((n < min[i]) || (n > max[i]))
148            goto err;
149        if (tm) {
150            switch (i) {
151            case 0:
152                tm->tm_year = n < 50 ? n + 100 : n;
153                break;
154            case 1:
155                tm->tm_mon = n - 1;
156                break;
157            case 2:
158                tm->tm_mday = n;
159                break;
160            case 3:
161                tm->tm_hour = n;
162                break;
163            case 4:
164                tm->tm_min = n;
165                break;
166            case 5:
167                tm->tm_sec = n;
168                break;
169            }
170        }
171    }
172    if (a[o] == 'Z')
173        o++;
174    else if ((a[o] == '+') || (a[o] == '-')) {
175        int offsign = a[o] == '-' ? 1 : -1, offset = 0;
176        o++;
177        if (o + 4 > l)
178            goto err;
179        for (i = 6; i < 8; i++) {
180            if ((a[o] < '0') || (a[o] > '9'))
181                goto err;
182            n = a[o] - '0';
183            o++;
184            if ((a[o] < '0') || (a[o] > '9'))
185                goto err;
186            n = (n * 10) + a[o] - '0';
187            if ((n < min[i]) || (n > max[i]))
188                goto err;
189            if (tm) {
190                if (i == 6)
191                    offset = n * 3600;
192                else if (i == 7)
193                    offset += n * 60;
194            }
195            o++;
196        }
197        if (offset && !OPENSSL_gmtime_adj(tm, 0, offset * offsign))
198            return 0;
199    }
200    return o == l;
201 err:
202    return 0;
203}
204
205int ASN1_UTCTIME_check(const ASN1_UTCTIME *d)
206{
207    return asn1_utctime_to_tm(NULL, d);
208}
209
210int ASN1_UTCTIME_set_string(ASN1_UTCTIME *s, const char *str)
211{
212    ASN1_UTCTIME t;
213
214    t.type = V_ASN1_UTCTIME;
215    t.length = strlen(str);
216    t.data = (unsigned char *)str;
217    if (ASN1_UTCTIME_check(&t)) {
218        if (s != NULL) {
219            if (!ASN1_STRING_set((ASN1_STRING *)s,
220                                 (unsigned char *)str, t.length))
221                return 0;
222            s->type = V_ASN1_UTCTIME;
223        }
224        return (1);
225    } else
226        return (0);
227}
228
229ASN1_UTCTIME *ASN1_UTCTIME_set(ASN1_UTCTIME *s, time_t t)
230{
231    return ASN1_UTCTIME_adj(s, t, 0, 0);
232}
233
234ASN1_UTCTIME *ASN1_UTCTIME_adj(ASN1_UTCTIME *s, time_t t,
235                               int offset_day, long offset_sec)
236{
237    char *p;
238    struct tm *ts;
239    struct tm data;
240    size_t len = 20;
241    int free_s = 0;
242
243    if (s == NULL) {
244        free_s = 1;
245        s = M_ASN1_UTCTIME_new();
246    }
247    if (s == NULL)
248        goto err;
249
250    ts = OPENSSL_gmtime(&t, &data);
251    if (ts == NULL)
252        goto err;
253
254    if (offset_day || offset_sec) {
255        if (!OPENSSL_gmtime_adj(ts, offset_day, offset_sec))
256            goto err;
257    }
258
259    if ((ts->tm_year < 50) || (ts->tm_year >= 150))
260        goto err;
261
262    p = (char *)s->data;
263    if ((p == NULL) || ((size_t)s->length < len)) {
264        p = OPENSSL_malloc(len);
265        if (p == NULL) {
266            ASN1err(ASN1_F_ASN1_UTCTIME_ADJ, ERR_R_MALLOC_FAILURE);
267            goto err;
268        }
269        if (s->data != NULL)
270            OPENSSL_free(s->data);
271        s->data = (unsigned char *)p;
272    }
273
274    BIO_snprintf(p, len, "%02d%02d%02d%02d%02d%02dZ", ts->tm_year % 100,
275                 ts->tm_mon + 1, ts->tm_mday, ts->tm_hour, ts->tm_min,
276                 ts->tm_sec);
277    s->length = strlen(p);
278    s->type = V_ASN1_UTCTIME;
279#ifdef CHARSET_EBCDIC_not
280    ebcdic2ascii(s->data, s->data, s->length);
281#endif
282    return (s);
283 err:
284    if (free_s && s)
285        M_ASN1_UTCTIME_free(s);
286    return NULL;
287}
288
289int ASN1_UTCTIME_cmp_time_t(const ASN1_UTCTIME *s, time_t t)
290{
291    struct tm stm, ttm;
292    int day, sec;
293
294    if (!asn1_utctime_to_tm(&stm, s))
295        return -2;
296
297    if (!OPENSSL_gmtime(&t, &ttm))
298        return -2;
299
300    if (!OPENSSL_gmtime_diff(&day, &sec, &ttm, &stm))
301        return -2;
302
303    if (day > 0)
304        return 1;
305    if (day < 0)
306        return -1;
307    if (sec > 0)
308        return 1;
309    if (sec < 0)
310        return -1;
311    return 0;
312}
313
314#if 0
315time_t ASN1_UTCTIME_get(const ASN1_UTCTIME *s)
316{
317    struct tm tm;
318    int offset;
319
320    memset(&tm, '\0', sizeof tm);
321
322# define g2(p) (((p)[0]-'0')*10+(p)[1]-'0')
323    tm.tm_year = g2(s->data);
324    if (tm.tm_year < 50)
325        tm.tm_year += 100;
326    tm.tm_mon = g2(s->data + 2) - 1;
327    tm.tm_mday = g2(s->data + 4);
328    tm.tm_hour = g2(s->data + 6);
329    tm.tm_min = g2(s->data + 8);
330    tm.tm_sec = g2(s->data + 10);
331    if (s->data[12] == 'Z')
332        offset = 0;
333    else {
334        offset = g2(s->data + 13) * 60 + g2(s->data + 15);
335        if (s->data[12] == '-')
336            offset = -offset;
337    }
338# undef g2
339
340    /*
341     * FIXME: mktime assumes the current timezone
342     * instead of UTC, and unless we rewrite OpenSSL
343     * in Lisp we cannot locally change the timezone
344     * without possibly interfering with other parts
345     * of the program. timegm, which uses UTC, is
346     * non-standard.
347     * Also time_t is inappropriate for general
348     * UTC times because it may a 32 bit type.
349     */
350    return mktime(&tm) - offset * 60;
351}
352#endif
353