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 
65 #include "asn1_locl.h"
66 
67 
asn1_utctime_to_tm(struct tm * tm,const ASN1_UTCTIME * d)68 int asn1_utctime_to_tm(struct tm *tm, const ASN1_UTCTIME *d)
69 {
70     static const int min[8] = { 0, 1, 1, 0, 0, 0, 0, 0 };
71     static const int max[8] = { 99, 12, 31, 23, 59, 59, 12, 59 };
72     char *a;
73     int n, i, l, o;
74 
75     if (d->type != V_ASN1_UTCTIME)
76         return (0);
77     l = d->length;
78     a = (char *)d->data;
79     o = 0;
80 
81     if (l < 11)
82         goto err;
83     for (i = 0; i < 6; i++) {
84         if ((i == 5) && ((a[o] == 'Z') || (a[o] == '+') || (a[o] == '-'))) {
85             i++;
86             if (tm)
87                 tm->tm_sec = 0;
88             break;
89         }
90         if ((a[o] < '0') || (a[o] > '9'))
91             goto err;
92         n = a[o] - '0';
93         if (++o > l)
94             goto err;
95 
96         if ((a[o] < '0') || (a[o] > '9'))
97             goto err;
98         n = (n * 10) + a[o] - '0';
99         if (++o > l)
100             goto err;
101 
102         if ((n < min[i]) || (n > max[i]))
103             goto err;
104         if (tm) {
105             switch (i) {
106             case 0:
107                 tm->tm_year = n < 50 ? n + 100 : n;
108                 break;
109             case 1:
110                 tm->tm_mon = n - 1;
111                 break;
112             case 2:
113                 tm->tm_mday = n;
114                 break;
115             case 3:
116                 tm->tm_hour = n;
117                 break;
118             case 4:
119                 tm->tm_min = n;
120                 break;
121             case 5:
122                 tm->tm_sec = n;
123                 break;
124             }
125         }
126     }
127     if (a[o] == 'Z')
128         o++;
129     else if ((a[o] == '+') || (a[o] == '-')) {
130         int offsign = a[o] == '-' ? 1 : -1, offset = 0;
131         o++;
132         if (o + 4 > l)
133             goto err;
134         for (i = 6; i < 8; i++) {
135             if ((a[o] < '0') || (a[o] > '9'))
136                 goto err;
137             n = a[o] - '0';
138             o++;
139             if ((a[o] < '0') || (a[o] > '9'))
140                 goto err;
141             n = (n * 10) + a[o] - '0';
142             if ((n < min[i]) || (n > max[i]))
143                 goto err;
144             if (tm) {
145                 if (i == 6)
146                     offset = n * 3600;
147                 else if (i == 7)
148                     offset += n * 60;
149             }
150             o++;
151         }
152         if (offset && !OPENSSL_gmtime_adj(tm, 0, offset * offsign))
153             return 0;
154     }
155     return o == l;
156  err:
157     return 0;
158 }
159 
ASN1_UTCTIME_check(const ASN1_UTCTIME * d)160 int ASN1_UTCTIME_check(const ASN1_UTCTIME *d)
161 {
162     return asn1_utctime_to_tm(NULL, d);
163 }
164 
ASN1_UTCTIME_set_string(ASN1_UTCTIME * s,const char * str)165 int ASN1_UTCTIME_set_string(ASN1_UTCTIME *s, const char *str)
166 {
167     ASN1_UTCTIME t;
168 
169     t.type = V_ASN1_UTCTIME;
170     t.length = strlen(str);
171     t.data = (unsigned char *)str;
172     if (ASN1_UTCTIME_check(&t)) {
173         if (s != NULL) {
174             if (!ASN1_STRING_set((ASN1_STRING *)s,
175                                  (unsigned char *)str, t.length))
176                 return 0;
177             s->type = V_ASN1_UTCTIME;
178         }
179         return (1);
180     } else
181         return (0);
182 }
183 
ASN1_UTCTIME_set(ASN1_UTCTIME * s,time_t t)184 ASN1_UTCTIME *ASN1_UTCTIME_set(ASN1_UTCTIME *s, time_t t)
185 {
186     return ASN1_UTCTIME_adj(s, t, 0, 0);
187 }
188 
ASN1_UTCTIME_adj(ASN1_UTCTIME * s,time_t t,int offset_day,long offset_sec)189 ASN1_UTCTIME *ASN1_UTCTIME_adj(ASN1_UTCTIME *s, time_t t,
190                                int offset_day, long offset_sec)
191 {
192     char *p;
193     struct tm *ts;
194     struct tm data;
195     size_t len = 20;
196     int free_s = 0;
197 
198     if (s == NULL) {
199         free_s = 1;
200         s = M_ASN1_UTCTIME_new();
201     }
202     if (s == NULL)
203         goto err;
204 
205     ts = OPENSSL_gmtime(&t, &data);
206     if (ts == NULL)
207         goto err;
208 
209     if (offset_day || offset_sec) {
210         if (!OPENSSL_gmtime_adj(ts, offset_day, offset_sec))
211             goto err;
212     }
213 
214     if ((ts->tm_year < 50) || (ts->tm_year >= 150))
215         goto err;
216 
217     p = (char *)s->data;
218     if ((p == NULL) || ((size_t)s->length < len)) {
219         p = OPENSSL_malloc(len);
220         if (p == NULL) {
221             OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
222             goto err;
223         }
224         if (s->data != NULL)
225             OPENSSL_free(s->data);
226         s->data = (unsigned char *)p;
227     }
228 
229     BIO_snprintf(p, len, "%02d%02d%02d%02d%02d%02dZ", ts->tm_year % 100,
230                  ts->tm_mon + 1, ts->tm_mday, ts->tm_hour, ts->tm_min,
231                  ts->tm_sec);
232     s->length = strlen(p);
233     s->type = V_ASN1_UTCTIME;
234     return (s);
235  err:
236     if (free_s && s)
237         M_ASN1_UTCTIME_free(s);
238     return NULL;
239 }
240 
ASN1_UTCTIME_cmp_time_t(const ASN1_UTCTIME * s,time_t t)241 int ASN1_UTCTIME_cmp_time_t(const ASN1_UTCTIME *s, time_t t)
242 {
243     struct tm stm, ttm;
244     int day, sec;
245 
246     if (!asn1_utctime_to_tm(&stm, s))
247         return -2;
248 
249     if (!OPENSSL_gmtime(&t, &ttm))
250         return -2;
251 
252     if (!OPENSSL_gmtime_diff(&day, &sec, &ttm, &stm))
253         return -2;
254 
255     if (day > 0)
256         return 1;
257     if (day < 0)
258         return -1;
259     if (sec > 0)
260         return 1;
261     if (sec < 0)
262         return -1;
263     return 0;
264 }
265 
266 #if 0
267 time_t ASN1_UTCTIME_get(const ASN1_UTCTIME *s)
268 {
269     struct tm tm;
270     int offset;
271 
272     OPENSSL_memset(&tm, '\0', sizeof tm);
273 
274 # define g2(p) (((p)[0]-'0')*10+(p)[1]-'0')
275     tm.tm_year = g2(s->data);
276     if (tm.tm_year < 50)
277         tm.tm_year += 100;
278     tm.tm_mon = g2(s->data + 2) - 1;
279     tm.tm_mday = g2(s->data + 4);
280     tm.tm_hour = g2(s->data + 6);
281     tm.tm_min = g2(s->data + 8);
282     tm.tm_sec = g2(s->data + 10);
283     if (s->data[12] == 'Z')
284         offset = 0;
285     else {
286         offset = g2(s->data + 13) * 60 + g2(s->data + 15);
287         if (s->data[12] == '-')
288             offset = -offset;
289     }
290 # undef g2
291 
292     return mktime(&tm) - offset * 60; /* FIXME: mktime assumes the current
293                                        * timezone instead of UTC, and unless
294                                        * we rewrite OpenSSL in Lisp we cannot
295                                        * locally change the timezone without
296                                        * possibly interfering with other
297                                        * parts of the program. timegm, which
298                                        * uses UTC, is non-standard. Also
299                                        * time_t is inappropriate for general
300                                        * UTC times because it may a 32 bit
301                                        * type. */
302 }
303 #endif
304