a_utctm.c revision 296341 
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
65#if 0
66int i2d_ASN1_UTCTIME(ASN1_UTCTIME *a, unsigned char **pp)
67{
68# ifndef CHARSET_EBCDIC
69    return (i2d_ASN1_bytes((ASN1_STRING *)a, pp,
70                           V_ASN1_UTCTIME, V_ASN1_UNIVERSAL));
71# else
72    /* KLUDGE! We convert to ascii before writing DER */
73    int len;
74    char tmp[24];
75    ASN1_STRING x = *(ASN1_STRING *)a;
76
77    len = x.length;
78    ebcdic2ascii(tmp, x.data, (len >= sizeof tmp) ? sizeof tmp : len);
79    x.data = tmp;
80    return i2d_ASN1_bytes(&x, pp, V_ASN1_UTCTIME, V_ASN1_UNIVERSAL);
81# endif
82}
83
84ASN1_UTCTIME *d2i_ASN1_UTCTIME(ASN1_UTCTIME **a, unsigned char **pp,
85                               long length)
86{
87    ASN1_UTCTIME *ret = NULL;
88
89    ret = (ASN1_UTCTIME *)d2i_ASN1_bytes((ASN1_STRING **)a, pp, length,
90                                         V_ASN1_UTCTIME, V_ASN1_UNIVERSAL);
91    if (ret == NULL) {
92        ASN1err(ASN1_F_D2I_ASN1_UTCTIME, ERR_R_NESTED_ASN1_ERROR);
93        return (NULL);
94    }
95# ifdef CHARSET_EBCDIC
96    ascii2ebcdic(ret->data, ret->data, ret->length);
97# endif
98    if (!ASN1_UTCTIME_check(ret)) {
99        ASN1err(ASN1_F_D2I_ASN1_UTCTIME, ASN1_R_INVALID_TIME_FORMAT);
100        goto err;
101    }
102
103    return (ret);
104 err:
105    if ((ret != NULL) && ((a == NULL) || (*a != ret)))
106        M_ASN1_UTCTIME_free(ret);
107    return (NULL);
108}
109
110#endif
111
112int ASN1_UTCTIME_check(ASN1_UTCTIME *d)
113{
114    static const int min[8] = { 0, 1, 1, 0, 0, 0, 0, 0 };
115    static const int max[8] = { 99, 12, 31, 23, 59, 59, 12, 59 };
116    char *a;
117    int n, i, l, o;
118
119    if (d->type != V_ASN1_UTCTIME)
120        return (0);
121    l = d->length;
122    a = (char *)d->data;
123    o = 0;
124
125    if (l < 11)
126        goto err;
127    for (i = 0; i < 6; i++) {
128        if ((i == 5) && ((a[o] == 'Z') || (a[o] == '+') || (a[o] == '-'))) {
129            i++;
130            break;
131        }
132        if ((a[o] < '0') || (a[o] > '9'))
133            goto err;
134        n = a[o] - '0';
135        if (++o > l)
136            goto err;
137
138        if ((a[o] < '0') || (a[o] > '9'))
139            goto err;
140        n = (n * 10) + a[o] - '0';
141        if (++o > l)
142            goto err;
143
144        if ((n < min[i]) || (n > max[i]))
145            goto err;
146    }
147    if (a[o] == 'Z')
148        o++;
149    else if ((a[o] == '+') || (a[o] == '-')) {
150        o++;
151        if (o + 4 > l)
152            goto err;
153        for (i = 6; i < 8; i++) {
154            if ((a[o] < '0') || (a[o] > '9'))
155                goto err;
156            n = a[o] - '0';
157            o++;
158            if ((a[o] < '0') || (a[o] > '9'))
159                goto err;
160            n = (n * 10) + a[o] - '0';
161            if ((n < min[i]) || (n > max[i]))
162                goto err;
163            o++;
164        }
165    }
166    return (o == l);
167 err:
168    return (0);
169}
170
171int ASN1_UTCTIME_set_string(ASN1_UTCTIME *s, const char *str)
172{
173    ASN1_UTCTIME t;
174
175    t.type = V_ASN1_UTCTIME;
176    t.length = strlen(str);
177    t.data = (unsigned char *)str;
178    if (ASN1_UTCTIME_check(&t)) {
179        if (s != NULL) {
180            if (!ASN1_STRING_set((ASN1_STRING *)s,
181                                 (unsigned char *)str, t.length))
182                return 0;
183            s->type = V_ASN1_UTCTIME;
184        }
185        return (1);
186    } else
187        return (0);
188}
189
190ASN1_UTCTIME *ASN1_UTCTIME_set(ASN1_UTCTIME *s, time_t t)
191{
192    return ASN1_UTCTIME_adj(s, t, 0, 0);
193}
194
195ASN1_UTCTIME *ASN1_UTCTIME_adj(ASN1_UTCTIME *s, time_t t,
196                               int offset_day, long offset_sec)
197{
198    char *p;
199    struct tm *ts;
200    struct tm data;
201    size_t len = 20;
202    int free_s = 0;
203
204    if (s == NULL) {
205        free_s = 1;
206        s = M_ASN1_UTCTIME_new();
207    }
208    if (s == NULL)
209        goto err;
210
211    ts = OPENSSL_gmtime(&t, &data);
212    if (ts == NULL)
213        goto err;
214
215    if (offset_day || offset_sec) {
216        if (!OPENSSL_gmtime_adj(ts, offset_day, offset_sec))
217            goto err;
218    }
219
220    if ((ts->tm_year < 50) || (ts->tm_year >= 150))
221        goto err;
222
223    p = (char *)s->data;
224    if ((p == NULL) || ((size_t)s->length < len)) {
225        p = OPENSSL_malloc(len);
226        if (p == NULL) {
227            ASN1err(ASN1_F_ASN1_UTCTIME_ADJ, ERR_R_MALLOC_FAILURE);
228            goto err;
229        }
230        if (s->data != NULL)
231            OPENSSL_free(s->data);
232        s->data = (unsigned char *)p;
233    }
234
235    BIO_snprintf(p, len, "%02d%02d%02d%02d%02d%02dZ", ts->tm_year % 100,
236                 ts->tm_mon + 1, ts->tm_mday, ts->tm_hour, ts->tm_min,
237                 ts->tm_sec);
238    s->length = strlen(p);
239    s->type = V_ASN1_UTCTIME;
240#ifdef CHARSET_EBCDIC_not
241    ebcdic2ascii(s->data, s->data, s->length);
242#endif
243    return (s);
244 err:
245    if (free_s && s)
246        M_ASN1_UTCTIME_free(s);
247    return NULL;
248}
249
250int ASN1_UTCTIME_cmp_time_t(const ASN1_UTCTIME *s, time_t t)
251{
252    struct tm *tm;
253    struct tm data;
254    int offset;
255    int year;
256
257#define g2(p) (((p)[0]-'0')*10+(p)[1]-'0')
258
259    if (s->data[12] == 'Z')
260        offset = 0;
261    else {
262        offset = g2(s->data + 13) * 60 + g2(s->data + 15);
263        if (s->data[12] == '-')
264            offset = -offset;
265    }
266
267    t -= offset * 60;           /* FIXME: may overflow in extreme cases */
268
269    tm = OPENSSL_gmtime(&t, &data);
270    /*
271     * NB: -1, 0, 1 already valid return values so use -2 to indicate error.
272     */
273    if (tm == NULL)
274        return -2;
275
276#define return_cmp(a,b) if ((a)<(b)) return -1; else if ((a)>(b)) return 1
277    year = g2(s->data);
278    if (year < 50)
279        year += 100;
280    return_cmp(year, tm->tm_year);
281    return_cmp(g2(s->data + 2) - 1, tm->tm_mon);
282    return_cmp(g2(s->data + 4), tm->tm_mday);
283    return_cmp(g2(s->data + 6), tm->tm_hour);
284    return_cmp(g2(s->data + 8), tm->tm_min);
285    return_cmp(g2(s->data + 10), tm->tm_sec);
286#undef g2
287#undef return_cmp
288
289    return 0;
290}
291
292#if 0
293time_t ASN1_UTCTIME_get(const ASN1_UTCTIME *s)
294{
295    struct tm tm;
296    int offset;
297
298    memset(&tm, '\0', sizeof tm);
299
300# define g2(p) (((p)[0]-'0')*10+(p)[1]-'0')
301    tm.tm_year = g2(s->data);
302    if (tm.tm_year < 50)
303        tm.tm_year += 100;
304    tm.tm_mon = g2(s->data + 2) - 1;
305    tm.tm_mday = g2(s->data + 4);
306    tm.tm_hour = g2(s->data + 6);
307    tm.tm_min = g2(s->data + 8);
308    tm.tm_sec = g2(s->data + 10);
309    if (s->data[12] == 'Z')
310        offset = 0;
311    else {
312        offset = g2(s->data + 13) * 60 + g2(s->data + 15);
313        if (s->data[12] == '-')
314            offset = -offset;
315    }
316# undef g2
317
318    /*
319     * FIXME: mktime assumes the current timezone
320     * instead of UTC, and unless we rewrite OpenSSL
321     * in Lisp we cannot locally change the timezone
322     * without possibly interfering with other parts
323     * of the program. timegm, which uses UTC, is
324     * non-standard.
325     * Also time_t is inappropriate for general
326     * UTC times because it may a 32 bit type.
327     */
328    return mktime(&tm) - offset * 60;
329}
330#endif
331