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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 
asn1_generalizedtime_to_tm(struct tm * tm,const ASN1_GENERALIZEDTIME * d)67 int asn1_generalizedtime_to_tm(struct tm *tm, const ASN1_GENERALIZEDTIME *d)
68 {
69     static const int min[9] = { 0, 0, 1, 1, 0, 0, 0, 0, 0 };
70     static const int max[9] = { 99, 99, 12, 31, 23, 59, 59, 12, 59 };
71     char *a;
72     int n, i, l, o;
73 
74     if (d->type != V_ASN1_GENERALIZEDTIME)
75         return (0);
76     l = d->length;
77     a = (char *)d->data;
78     o = 0;
79     /*
80      * GENERALIZEDTIME is similar to UTCTIME except the year is represented
81      * as YYYY. This stuff treats everything as a two digit field so make
82      * first two fields 00 to 99
83      */
84     if (l < 13)
85         goto err;
86     for (i = 0; i < 7; i++) {
87         if ((i == 6) && ((a[o] == 'Z') || (a[o] == '+') || (a[o] == '-'))) {
88             i++;
89             if (tm)
90                 tm->tm_sec = 0;
91             break;
92         }
93         if ((a[o] < '0') || (a[o] > '9'))
94             goto err;
95         n = a[o] - '0';
96         if (++o > l)
97             goto err;
98 
99         if ((a[o] < '0') || (a[o] > '9'))
100             goto err;
101         n = (n * 10) + a[o] - '0';
102         if (++o > l)
103             goto err;
104 
105         if ((n < min[i]) || (n > max[i]))
106             goto err;
107         if (tm) {
108             switch (i) {
109             case 0:
110                 tm->tm_year = n * 100 - 1900;
111                 break;
112             case 1:
113                 tm->tm_year += n;
114                 break;
115             case 2:
116                 tm->tm_mon = n - 1;
117                 break;
118             case 3:
119                 tm->tm_mday = n;
120                 break;
121             case 4:
122                 tm->tm_hour = n;
123                 break;
124             case 5:
125                 tm->tm_min = n;
126                 break;
127             case 6:
128                 tm->tm_sec = n;
129                 break;
130             }
131         }
132     }
133     /*
134      * Optional fractional seconds: decimal point followed by one or more
135      * digits.
136      */
137     if (a[o] == '.') {
138         if (++o > l)
139             goto err;
140         i = o;
141         while ((a[o] >= '0') && (a[o] <= '9') && (o <= l))
142             o++;
143         /* Must have at least one digit after decimal point */
144         if (i == o)
145             goto err;
146     }
147 
148     if (a[o] == 'Z')
149         o++;
150     else if ((a[o] == '+') || (a[o] == '-')) {
151         int offsign = a[o] == '-' ? 1 : -1, offset = 0;
152         o++;
153         if (o + 4 > l)
154             goto err;
155         for (i = 7; i < 9; i++) {
156             if ((a[o] < '0') || (a[o] > '9'))
157                 goto err;
158             n = a[o] - '0';
159             o++;
160             if ((a[o] < '0') || (a[o] > '9'))
161                 goto err;
162             n = (n * 10) + a[o] - '0';
163             if ((n < min[i]) || (n > max[i]))
164                 goto err;
165             if (tm) {
166                 if (i == 7)
167                     offset = n * 3600;
168                 else if (i == 8)
169                     offset += n * 60;
170             }
171             o++;
172         }
173         if (offset && !OPENSSL_gmtime_adj(tm, 0, offset * offsign))
174             return 0;
175     } else if (a[o]) {
176         /* Missing time zone information. */
177         goto err;
178     }
179     return (o == l);
180  err:
181     return (0);
182 }
183 
ASN1_GENERALIZEDTIME_check(const ASN1_GENERALIZEDTIME * d)184 int ASN1_GENERALIZEDTIME_check(const ASN1_GENERALIZEDTIME *d)
185 {
186     return asn1_generalizedtime_to_tm(NULL, d);
187 }
188 
ASN1_GENERALIZEDTIME_set_string(ASN1_GENERALIZEDTIME * s,const char * str)189 int ASN1_GENERALIZEDTIME_set_string(ASN1_GENERALIZEDTIME *s, const char *str)
190 {
191     ASN1_GENERALIZEDTIME t;
192 
193     t.type = V_ASN1_GENERALIZEDTIME;
194     t.length = strlen(str);
195     t.data = (unsigned char *)str;
196     if (ASN1_GENERALIZEDTIME_check(&t)) {
197         if (s != NULL) {
198             if (!ASN1_STRING_set((ASN1_STRING *)s,
199                                  (unsigned char *)str, t.length))
200                 return 0;
201             s->type = V_ASN1_GENERALIZEDTIME;
202         }
203         return (1);
204     } else
205         return (0);
206 }
207 
ASN1_GENERALIZEDTIME_set(ASN1_GENERALIZEDTIME * s,time_t t)208 ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_set(ASN1_GENERALIZEDTIME *s,
209                                                time_t t)
210 {
211     return ASN1_GENERALIZEDTIME_adj(s, t, 0, 0);
212 }
213 
ASN1_GENERALIZEDTIME_adj(ASN1_GENERALIZEDTIME * s,time_t t,int offset_day,long offset_sec)214 ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_adj(ASN1_GENERALIZEDTIME *s,
215                                                time_t t, int offset_day,
216                                                long offset_sec)
217 {
218     char *p;
219     struct tm *ts;
220     struct tm data;
221     size_t len = 20;
222     ASN1_GENERALIZEDTIME *tmps = NULL;
223 
224     if (s == NULL)
225         tmps = ASN1_GENERALIZEDTIME_new();
226     else
227         tmps = s;
228     if (tmps == NULL)
229         return NULL;
230 
231     ts = OPENSSL_gmtime(&t, &data);
232     if (ts == NULL)
233         goto err;
234 
235     if (offset_day || offset_sec) {
236         if (!OPENSSL_gmtime_adj(ts, offset_day, offset_sec))
237             goto err;
238     }
239 
240     p = (char *)tmps->data;
241     if ((p == NULL) || ((size_t)tmps->length < len)) {
242         p = OPENSSL_malloc(len);
243         if (p == NULL) {
244             OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
245             goto err;
246         }
247         OPENSSL_free(tmps->data);
248         tmps->data = (unsigned char *)p;
249     }
250 
251     BIO_snprintf(p, len, "%04d%02d%02d%02d%02d%02dZ", ts->tm_year + 1900,
252                  ts->tm_mon + 1, ts->tm_mday, ts->tm_hour, ts->tm_min,
253                  ts->tm_sec);
254     tmps->length = strlen(p);
255     tmps->type = V_ASN1_GENERALIZEDTIME;
256     return tmps;
257  err:
258     if (s == NULL)
259         ASN1_GENERALIZEDTIME_free(tmps);
260     return NULL;
261 }
262