1 /* crypto/asn1/asn1_lib.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 <limits.h>
61 #include "cryptlib.h"
62 #include <openssl/asn1.h>
63 #include <openssl/asn1_mac.h>
64 
65 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
66                            int max);
67 static void asn1_put_length(unsigned char **pp, int length);
68 const char ASN1_version[] = "ASN.1" OPENSSL_VERSION_PTEXT;
69 
_asn1_check_infinite_end(const unsigned char ** p,long len)70 static int _asn1_check_infinite_end(const unsigned char **p, long len)
71 {
72     /*
73      * If there is 0 or 1 byte left, the length check should pick things up
74      */
75     if (len <= 0)
76         return (1);
77     else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) {
78         (*p) += 2;
79         return (1);
80     }
81     return (0);
82 }
83 
ASN1_check_infinite_end(unsigned char ** p,long len)84 int ASN1_check_infinite_end(unsigned char **p, long len)
85 {
86     return _asn1_check_infinite_end((const unsigned char **)p, len);
87 }
88 
ASN1_const_check_infinite_end(const unsigned char ** p,long len)89 int ASN1_const_check_infinite_end(const unsigned char **p, long len)
90 {
91     return _asn1_check_infinite_end(p, len);
92 }
93 
ASN1_get_object(const unsigned char ** pp,long * plength,int * ptag,int * pclass,long omax)94 int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
95                     int *pclass, long omax)
96 {
97     int i, ret;
98     long l;
99     const unsigned char *p = *pp;
100     int tag, xclass, inf;
101     long max = omax;
102 
103     if (!max)
104         goto err;
105     ret = (*p & V_ASN1_CONSTRUCTED);
106     xclass = (*p & V_ASN1_PRIVATE);
107     i = *p & V_ASN1_PRIMITIVE_TAG;
108     if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */
109         p++;
110         if (--max == 0)
111             goto err;
112         l = 0;
113         while (*p & 0x80) {
114             l <<= 7L;
115             l |= *(p++) & 0x7f;
116             if (--max == 0)
117                 goto err;
118             if (l > (INT_MAX >> 7L))
119                 goto err;
120         }
121         l <<= 7L;
122         l |= *(p++) & 0x7f;
123         tag = (int)l;
124         if (--max == 0)
125             goto err;
126     } else {
127         tag = i;
128         p++;
129         if (--max == 0)
130             goto err;
131     }
132     *ptag = tag;
133     *pclass = xclass;
134     if (!asn1_get_length(&p, &inf, plength, (int)max))
135         goto err;
136 
137     if (inf && !(ret & V_ASN1_CONSTRUCTED))
138         goto err;
139 
140 #if 0
141     fprintf(stderr, "p=%d + *plength=%ld > omax=%ld + *pp=%d  (%d > %d)\n",
142             (int)p, *plength, omax, (int)*pp, (int)(p + *plength),
143             (int)(omax + *pp));
144 
145 #endif
146     if (*plength > (omax - (p - *pp))) {
147         ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_TOO_LONG);
148         /*
149          * Set this so that even if things are not long enough the values are
150          * set correctly
151          */
152         ret |= 0x80;
153     }
154     *pp = p;
155     return (ret | inf);
156  err:
157     ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_HEADER_TOO_LONG);
158     return (0x80);
159 }
160 
asn1_get_length(const unsigned char ** pp,int * inf,long * rl,int max)161 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
162                            int max)
163 {
164     const unsigned char *p = *pp;
165     unsigned long ret = 0;
166     unsigned int i;
167 
168     if (max-- < 1)
169         return (0);
170     if (*p == 0x80) {
171         *inf = 1;
172         ret = 0;
173         p++;
174     } else {
175         *inf = 0;
176         i = *p & 0x7f;
177         if (*(p++) & 0x80) {
178             if (i > sizeof(long))
179                 return 0;
180             if (max-- == 0)
181                 return (0);
182             while (i-- > 0) {
183                 ret <<= 8L;
184                 ret |= *(p++);
185                 if (max-- == 0)
186                     return (0);
187             }
188         } else
189             ret = i;
190     }
191     if (ret > LONG_MAX)
192         return 0;
193     *pp = p;
194     *rl = (long)ret;
195     return (1);
196 }
197 
198 /*
199  * class 0 is constructed constructed == 2 for indefinite length constructed
200  */
ASN1_put_object(unsigned char ** pp,int constructed,int length,int tag,int xclass)201 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
202                      int xclass)
203 {
204     unsigned char *p = *pp;
205     int i, ttag;
206 
207     i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
208     i |= (xclass & V_ASN1_PRIVATE);
209     if (tag < 31)
210         *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG);
211     else {
212         *(p++) = i | V_ASN1_PRIMITIVE_TAG;
213         for (i = 0, ttag = tag; ttag > 0; i++)
214             ttag >>= 7;
215         ttag = i;
216         while (i-- > 0) {
217             p[i] = tag & 0x7f;
218             if (i != (ttag - 1))
219                 p[i] |= 0x80;
220             tag >>= 7;
221         }
222         p += ttag;
223     }
224     if (constructed == 2)
225         *(p++) = 0x80;
226     else
227         asn1_put_length(&p, length);
228     *pp = p;
229 }
230 
ASN1_put_eoc(unsigned char ** pp)231 int ASN1_put_eoc(unsigned char **pp)
232 {
233     unsigned char *p = *pp;
234     *p++ = 0;
235     *p++ = 0;
236     *pp = p;
237     return 2;
238 }
239 
asn1_put_length(unsigned char ** pp,int length)240 static void asn1_put_length(unsigned char **pp, int length)
241 {
242     unsigned char *p = *pp;
243     int i, l;
244     if (length <= 127)
245         *(p++) = (unsigned char)length;
246     else {
247         l = length;
248         for (i = 0; l > 0; i++)
249             l >>= 8;
250         *(p++) = i | 0x80;
251         l = i;
252         while (i-- > 0) {
253             p[i] = length & 0xff;
254             length >>= 8;
255         }
256         p += l;
257     }
258     *pp = p;
259 }
260 
ASN1_object_size(int constructed,int length,int tag)261 int ASN1_object_size(int constructed, int length, int tag)
262 {
263     int ret;
264 
265     ret = length;
266     ret++;
267     if (tag >= 31) {
268         while (tag > 0) {
269             tag >>= 7;
270             ret++;
271         }
272     }
273     if (constructed == 2)
274         return ret + 3;
275     ret++;
276     if (length > 127) {
277         while (length > 0) {
278             length >>= 8;
279             ret++;
280         }
281     }
282     return (ret);
283 }
284 
_asn1_Finish(ASN1_const_CTX * c)285 static int _asn1_Finish(ASN1_const_CTX *c)
286 {
287     if ((c->inf == (1 | V_ASN1_CONSTRUCTED)) && (!c->eos)) {
288         if (!ASN1_const_check_infinite_end(&c->p, c->slen)) {
289             c->error = ERR_R_MISSING_ASN1_EOS;
290             return (0);
291         }
292     }
293     if (((c->slen != 0) && !(c->inf & 1)) || ((c->slen < 0) && (c->inf & 1))) {
294         c->error = ERR_R_ASN1_LENGTH_MISMATCH;
295         return (0);
296     }
297     return (1);
298 }
299 
asn1_Finish(ASN1_CTX * c)300 int asn1_Finish(ASN1_CTX *c)
301 {
302     return _asn1_Finish((ASN1_const_CTX *)c);
303 }
304 
asn1_const_Finish(ASN1_const_CTX * c)305 int asn1_const_Finish(ASN1_const_CTX *c)
306 {
307     return _asn1_Finish(c);
308 }
309 
asn1_GetSequence(ASN1_const_CTX * c,long * length)310 int asn1_GetSequence(ASN1_const_CTX *c, long *length)
311 {
312     const unsigned char *q;
313 
314     q = c->p;
315     c->inf = ASN1_get_object(&(c->p), &(c->slen), &(c->tag), &(c->xclass),
316                              *length);
317     if (c->inf & 0x80) {
318         c->error = ERR_R_BAD_GET_ASN1_OBJECT_CALL;
319         return (0);
320     }
321     if (c->tag != V_ASN1_SEQUENCE) {
322         c->error = ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
323         return (0);
324     }
325     (*length) -= (c->p - q);
326     if (c->max && (*length < 0)) {
327         c->error = ERR_R_ASN1_LENGTH_MISMATCH;
328         return (0);
329     }
330     if (c->inf == (1 | V_ASN1_CONSTRUCTED))
331         c->slen = *length + *(c->pp) - c->p;
332     c->eos = 0;
333     return (1);
334 }
335 
ASN1_STRING_dup(ASN1_STRING * str)336 ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str)
337 {
338     ASN1_STRING *ret;
339 
340     if (str == NULL)
341         return (NULL);
342     if ((ret = ASN1_STRING_type_new(str->type)) == NULL)
343         return (NULL);
344     if (!ASN1_STRING_set(ret, str->data, str->length)) {
345         ASN1_STRING_free(ret);
346         return (NULL);
347     }
348     ret->flags = str->flags;
349     return (ret);
350 }
351 
ASN1_STRING_set(ASN1_STRING * str,const void * _data,int len)352 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
353 {
354     unsigned char *c;
355     const char *data = _data;
356 
357     if (len < 0) {
358         if (data == NULL)
359             return (0);
360         else
361             len = strlen(data);
362     }
363     if ((str->length < len) || (str->data == NULL)) {
364         c = str->data;
365         if (c == NULL)
366             str->data = OPENSSL_malloc(len + 1);
367         else
368             str->data = OPENSSL_realloc(c, len + 1);
369 
370         if (str->data == NULL) {
371             ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE);
372             str->data = c;
373             return (0);
374         }
375     }
376     str->length = len;
377     if (data != NULL) {
378         memcpy(str->data, data, len);
379         /* an allowance for strings :-) */
380         str->data[len] = '\0';
381     }
382     return (1);
383 }
384 
ASN1_STRING_set0(ASN1_STRING * str,void * data,int len)385 void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
386 {
387     if (str->data)
388         OPENSSL_free(str->data);
389     str->data = data;
390     str->length = len;
391 }
392 
ASN1_STRING_new(void)393 ASN1_STRING *ASN1_STRING_new(void)
394 {
395     return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
396 }
397 
ASN1_STRING_type_new(int type)398 ASN1_STRING *ASN1_STRING_type_new(int type)
399 {
400     ASN1_STRING *ret;
401 
402     ret = (ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
403     if (ret == NULL) {
404         ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE);
405         return (NULL);
406     }
407     ret->length = 0;
408     ret->type = type;
409     ret->data = NULL;
410     ret->flags = 0;
411     return (ret);
412 }
413 
ASN1_STRING_free(ASN1_STRING * a)414 void ASN1_STRING_free(ASN1_STRING *a)
415 {
416     if (a == NULL)
417         return;
418     if (a->data != NULL)
419         OPENSSL_free(a->data);
420     OPENSSL_free(a);
421 }
422 
ASN1_STRING_cmp(ASN1_STRING * a,ASN1_STRING * b)423 int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b)
424 {
425     int i;
426 
427     i = (a->length - b->length);
428     if (i == 0) {
429         i = memcmp(a->data, b->data, a->length);
430         if (i == 0)
431             return (a->type - b->type);
432         else
433             return (i);
434     } else
435         return (i);
436 }
437 
asn1_add_error(const unsigned char * address,int offset)438 void asn1_add_error(const unsigned char *address, int offset)
439 {
440     char buf1[DECIMAL_SIZE(address) + 1], buf2[DECIMAL_SIZE(offset) + 1];
441 
442     BIO_snprintf(buf1, sizeof buf1, "%lu", (unsigned long)address);
443     BIO_snprintf(buf2, sizeof buf2, "%d", offset);
444     ERR_add_error_data(4, "address=", buf1, " offset=", buf2);
445 }
446 
ASN1_STRING_length(ASN1_STRING * x)447 int ASN1_STRING_length(ASN1_STRING *x)
448 {
449     return M_ASN1_STRING_length(x);
450 }
451 
ASN1_STRING_length_set(ASN1_STRING * x,int len)452 void ASN1_STRING_length_set(ASN1_STRING *x, int len)
453 {
454     M_ASN1_STRING_length_set(x, len);
455     return;
456 }
457 
ASN1_STRING_type(ASN1_STRING * x)458 int ASN1_STRING_type(ASN1_STRING *x)
459 {
460     return M_ASN1_STRING_type(x);
461 }
462 
ASN1_STRING_data(ASN1_STRING * x)463 unsigned char *ASN1_STRING_data(ASN1_STRING *x)
464 {
465     return M_ASN1_STRING_data(x);
466 }
467