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,int max);
66 static void asn1_put_length(unsigned char **pp, int length);
67 const char ASN1_version[]="ASN.1" OPENSSL_VERSION_PTEXT;
68
69 static int _asn1_check_infinite_end(const unsigned char **p, long len)
70 {
71 /* If there is 0 or 1 byte left, the length check should pick
72 * things up */
73 if (len <= 0)
74 return(1);
75 else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0))
76 {
77 (*p)+=2;
78 return(1);
79 }
80 return(0);
81 }
82
83 int ASN1_check_infinite_end(unsigned char **p, long len)
84 {
85 return _asn1_check_infinite_end((const unsigned char **)p, len);
86 }
87
88 int ASN1_const_check_infinite_end(const unsigned char **p, long len)
89 {
90 return _asn1_check_infinite_end(p, len);
91 }
92
93
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) goto err;
104 ret=(*p&V_ASN1_CONSTRUCTED);
105 xclass=(*p&V_ASN1_PRIVATE);
106 i= *p&V_ASN1_PRIMITIVE_TAG;
107 if (i == V_ASN1_PRIMITIVE_TAG)
108 { /* high-tag */
109 p++;
110 if (--max == 0) goto err;
111 l=0;
112 while (*p&0x80)
113 {
114 l<<=7L;
115 l|= *(p++)&0x7f;
116 if (--max == 0) goto err;
117 if (l > (INT_MAX >> 7L)) goto err;
118 }
119 l<<=7L;
120 l|= *(p++)&0x7f;
121 tag=(int)l;
122 if (--max == 0) goto err;
123 }
124 else
125 {
126 tag=i;
127 p++;
128 if (--max == 0) goto err;
129 }
130 *ptag=tag;
131 *pclass=xclass;
132 if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err;
133
134 #if 0
135 fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n",
136 (int)p,*plength,omax,(int)*pp,(int)(p+ *plength),
137 (int)(omax+ *pp));
138
139 #endif
140 if (*plength > (omax - (p - *pp)))
141 {
142 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG);
143 /* Set this so that even if things are not long enough
144 * the values are set correctly */
145 ret|=0x80;
146 }
147 *pp=p;
148 return(ret|inf);
149 err:
150 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
151 return(0x80);
152 }
153
154 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max)
155 {
156 const unsigned char *p= *pp;
157 unsigned long ret=0;
158 unsigned int i;
159
160 if (max-- < 1) return(0);
161 if (*p == 0x80)
162 {
163 *inf=1;
164 ret=0;
165 p++;
166 }
167 else
168 {
169 *inf=0;
170 i= *p&0x7f;
171 if (*(p++) & 0x80)
172 {
173 if (i > sizeof(long))
174 return 0;
175 if (max-- == 0) return(0);
176 while (i-- > 0)
177 {
178 ret<<=8L;
179 ret|= *(p++);
180 if (max-- == 0) return(0);
181 }
182 }
183 else
184 ret=i;
185 }
186 if (ret > LONG_MAX)
187 return 0;
188 *pp=p;
189 *rl=(long)ret;
190 return(1);
191 }
192
193 /* class 0 is constructed
194 * constructed == 2 for indefinite length constructed */
195 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
196 int xclass)
197 {
198 unsigned char *p= *pp;
199 int i, ttag;
200
201 i=(constructed)?V_ASN1_CONSTRUCTED:0;
202 i|=(xclass&V_ASN1_PRIVATE);
203 if (tag < 31)
204 *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);
205 else
206 {
207 *(p++)=i|V_ASN1_PRIMITIVE_TAG;
208 for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;
209 ttag = i;
210 while(i-- > 0)
211 {
212 p[i] = tag & 0x7f;
213 if(i != (ttag - 1)) p[i] |= 0x80;
214 tag >>= 7;
215 }
216 p += ttag;
217 }
218 if (constructed == 2)
219 *(p++)=0x80;
220 else
221 asn1_put_length(&p,length);
222 *pp=p;
223 }
224
225 int ASN1_put_eoc(unsigned char **pp)
226 {
227 unsigned char *p = *pp;
228 *p++ = 0;
229 *p++ = 0;
230 *pp = p;
231 return 2;
232 }
233
234 static void asn1_put_length(unsigned char **pp, int length)
235 {
236 unsigned char *p= *pp;
237 int i,l;
238 if (length <= 127)
239 *(p++)=(unsigned char)length;
240 else
241 {
242 l=length;
243 for (i=0; l > 0; i++)
244 l>>=8;
245 *(p++)=i|0x80;
246 l=i;
247 while (i-- > 0)
248 {
249 p[i]=length&0xff;
250 length>>=8;
251 }
252 p+=l;
253 }
254 *pp=p;
255 }
256
257 int ASN1_object_size(int constructed, int length, int tag)
258 {
259 int ret;
260
261 ret=length;
262 ret++;
263 if (tag >= 31)
264 {
265 while (tag > 0)
266 {
267 tag>>=7;
268 ret++;
269 }
270 }
271 if (constructed == 2)
272 return ret + 3;
273 ret++;
274 if (length > 127)
275 {
276 while (length > 0)
277 {
278 length>>=8;
279 ret++;
280 }
281 }
282 return(ret);
283 }
284
285 static int _asn1_Finish(ASN1_const_CTX *c)
286 {
287 if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
288 {
289 if (!ASN1_const_check_infinite_end(&c->p,c->slen))
290 {
291 c->error=ERR_R_MISSING_ASN1_EOS;
292 return(0);
293 }
294 }
295 if ( ((c->slen != 0) && !(c->inf & 1)) ||
296 ((c->slen < 0) && (c->inf & 1)))
297 {
298 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
299 return(0);
300 }
301 return(1);
302 }
303
304 int asn1_Finish(ASN1_CTX *c)
305 {
306 return _asn1_Finish((ASN1_const_CTX *)c);
307 }
308
309 int asn1_const_Finish(ASN1_const_CTX *c)
310 {
311 return _asn1_Finish(c);
312 }
313
314 int asn1_GetSequence(ASN1_const_CTX *c, long *length)
315 {
316 const unsigned char *q;
317
318 q=c->p;
319 c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
320 *length);
321 if (c->inf & 0x80)
322 {
323 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
324 return(0);
325 }
326 if (c->tag != V_ASN1_SEQUENCE)
327 {
328 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
329 return(0);
330 }
331 (*length)-=(c->p-q);
332 if (c->max && (*length < 0))
333 {
334 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
335 return(0);
336 }
337 if (c->inf == (1|V_ASN1_CONSTRUCTED))
338 c->slen= *length+ *(c->pp)-c->p;
339 c->eos=0;
340 return(1);
341 }
342
343 int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
344 {
345 if (str == NULL)
346 return 0;
347 dst->type = str->type;
348 if (!ASN1_STRING_set(dst,str->data,str->length))
349 return 0;
350 dst->flags = str->flags;
351 return 1;
352 }
353
354 ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
355 {
356 ASN1_STRING *ret;
357 if (!str)
358 return NULL;
359 ret=ASN1_STRING_new();
360 if (!ret)
361 return NULL;
362 if (!ASN1_STRING_copy(ret,str))
363 {
364 ASN1_STRING_free(ret);
365 return NULL;
366 }
367 return ret;
368 }
369
370 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
371 {
372 unsigned char *c;
373 const char *data=_data;
374
375 if (len < 0)
376 {
377 if (data == NULL)
378 return(0);
379 else
380 len=strlen(data);
381 }
382 if ((str->length < len) || (str->data == NULL))
383 {
384 c=str->data;
385 if (c == NULL)
386 str->data=OPENSSL_malloc(len+1);
387 else
388 str->data=OPENSSL_realloc(c,len+1);
389
390 if (str->data == NULL)
391 {
392 ASN1err(ASN1_F_ASN1_STRING_SET,ERR_R_MALLOC_FAILURE);
393 str->data=c;
394 return(0);
395 }
396 }
397 str->length=len;
398 if (data != NULL)
399 {
400 memcpy(str->data,data,len);
401 /* an allowance for strings :-) */
402 str->data[len]='\0';
403 }
404 return(1);
405 }
406
407 void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
408 {
409 if (str->data)
410 OPENSSL_free(str->data);
411 str->data = data;
412 str->length = len;
413 }
414
415 ASN1_STRING *ASN1_STRING_new(void)
416 {
417 return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
418 }
419
420
421 ASN1_STRING *ASN1_STRING_type_new(int type)
422 {
423 ASN1_STRING *ret;
424
425 ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
426 if (ret == NULL)
427 {
428 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
429 return(NULL);
430 }
431 ret->length=0;
432 ret->type=type;
433 ret->data=NULL;
434 ret->flags=0;
435 return(ret);
436 }
437
438 void ASN1_STRING_free(ASN1_STRING *a)
439 {
440 if (a == NULL) return;
441 if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
442 OPENSSL_free(a->data);
443 OPENSSL_free(a);
444 }
445
446 int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
447 {
448 int i;
449
450 i=(a->length-b->length);
451 if (i == 0)
452 {
453 i=memcmp(a->data,b->data,a->length);
454 if (i == 0)
455 return(a->type-b->type);
456 else
457 return(i);
458 }
459 else
460 return(i);
461 }
462
463 void asn1_add_error(const unsigned char *address, int offset)
464 {
465 char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1];
466
467 BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address);
468 BIO_snprintf(buf2,sizeof buf2,"%d",offset);
469 ERR_add_error_data(4,"address=",buf1," offset=",buf2);
470 }
471
472 int ASN1_STRING_length(const ASN1_STRING *x)
473 { return M_ASN1_STRING_length(x); }
474
475 void ASN1_STRING_length_set(ASN1_STRING *x, int len)
476 { M_ASN1_STRING_length_set(x, len); return; }
477
478 int ASN1_STRING_type(ASN1_STRING *x)
479 { return M_ASN1_STRING_type(x); }
480
481 unsigned char * ASN1_STRING_data(ASN1_STRING *x)
482 { return M_ASN1_STRING_data(x); }