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Import OpenSSL-0.9.8i.
[dragonfly.git] / crypto / openssl-0.9.7e / crypto / asn1 / tasn_dec.c
blob2426cb6253a302cb3b7cf26edb165f68eadf9b14
1 /* tasn_dec.c */
2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
3 * project 2000.
4 */
5 /* ====================================================================
6 * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59
60 #include <stddef.h>
61 #include <string.h>
62 #include <openssl/asn1.h>
63 #include <openssl/asn1t.h>
64 #include <openssl/objects.h>
65 #include <openssl/buffer.h>
66 #include <openssl/err.h>
67
68 static int asn1_check_eoc(unsigned char **in, long len);
69 static int asn1_collect(BUF_MEM *buf, unsigned char **in, long len, char inf, int tag, int aclass);
70 static int collect_data(BUF_MEM *buf, unsigned char **p, long plen);
71 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, char *inf, char *cst,
72 unsigned char **in, long len, int exptag, int expclass, char opt, ASN1_TLC *ctx);
73 static int asn1_template_ex_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx);
74 static int asn1_template_noexp_d2i(ASN1_VALUE **val, unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx);
75 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, unsigned char **in, long len,
76 const ASN1_ITEM *it, int tag, int aclass, char opt, ASN1_TLC *ctx);
77
78 /* Table to convert tags to bit values, used for MSTRING type */
79 static unsigned long tag2bit[32]={
80 0, 0, 0, B_ASN1_BIT_STRING, /* tags 0 - 3 */
81 B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN,/* tags 4- 7 */
82 B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,/* tags 8-11 */
83 B_ASN1_UTF8STRING,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,/* tags 12-15 */
84 0, 0, B_ASN1_NUMERICSTRING,B_ASN1_PRINTABLESTRING, /* tags 16-19 */
85 B_ASN1_T61STRING,B_ASN1_VIDEOTEXSTRING,B_ASN1_IA5STRING, /* tags 20-22 */
86 B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME, /* tags 23-24 */
87 B_ASN1_GRAPHICSTRING,B_ASN1_ISO64STRING,B_ASN1_GENERALSTRING, /* tags 25-27 */
88 B_ASN1_UNIVERSALSTRING,B_ASN1_UNKNOWN,B_ASN1_BMPSTRING,B_ASN1_UNKNOWN, /* tags 28-31 */
89 };
90
91 unsigned long ASN1_tag2bit(int tag)
92 {
93 if((tag < 0) || (tag > 30)) return 0;
94 return tag2bit[tag];
95 }
96
97 /* Macro to initialize and invalidate the cache */
98
99 #define asn1_tlc_clear(c) if(c) (c)->valid = 0
100
101 /* Decode an ASN1 item, this currently behaves just
102 * like a standard 'd2i' function. 'in' points to
103 * a buffer to read the data from, in future we will
104 * have more advanced versions that can input data
105 * a piece at a time and this will simply be a special
106 * case.
107 */
108
109 ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_ITEM *it)
110 {
111 ASN1_TLC c;
112 ASN1_VALUE *ptmpval = NULL;
113 if(!pval) pval = &ptmpval;
114 asn1_tlc_clear(&c);
115 if(ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0)
116 return *pval;
117 return NULL;
118 }
119
120 int ASN1_template_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_TEMPLATE *tt)
121 {
122 ASN1_TLC c;
123 asn1_tlc_clear(&c);
124 return asn1_template_ex_d2i(pval, in, len, tt, 0, &c);
125 }
126
127
128 /* Decode an item, taking care of IMPLICIT tagging, if any.
129 * If 'opt' set and tag mismatch return -1 to handle OPTIONAL
130 */
131
132 int ASN1_item_ex_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_ITEM *it,
133 int tag, int aclass, char opt, ASN1_TLC *ctx)
134 {
135 const ASN1_TEMPLATE *tt, *errtt = NULL;
136 const ASN1_COMPAT_FUNCS *cf;
137 const ASN1_EXTERN_FUNCS *ef;
138 const ASN1_AUX *aux = it->funcs;
139 ASN1_aux_cb *asn1_cb;
140 unsigned char *p, *q, imphack = 0, oclass;
141 char seq_eoc, seq_nolen, cst, isopt;
142 long tmplen;
143 int i;
144 int otag;
145 int ret = 0;
146 ASN1_VALUE *pchval, **pchptr, *ptmpval;
147 if(!pval) return 0;
148 if(aux && aux->asn1_cb) asn1_cb = aux->asn1_cb;
149 else asn1_cb = 0;
150
151 switch(it->itype) {
152
153 case ASN1_ITYPE_PRIMITIVE:
154 if(it->templates) {
155 /* tagging or OPTIONAL is currently illegal on an item template
156 * because the flags can't get passed down. In practice this isn't
157 * a problem: we include the relevant flags from the item template
158 * in the template itself.
159 */
160 if ((tag != -1) || opt) {
161 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
162 goto err;
163 }
164 return asn1_template_ex_d2i(pval, in, len, it->templates, opt, ctx);
165 }
166 return asn1_d2i_ex_primitive(pval, in, len, it, tag, aclass, opt, ctx);
167 break;
168
169 case ASN1_ITYPE_MSTRING:
170 p = *in;
171 /* Just read in tag and class */
172 ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL, &p, len, -1, 0, 1, ctx);
173 if(!ret) {
174 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
175 goto err;
176 }
177 /* Must be UNIVERSAL class */
178 if(oclass != V_ASN1_UNIVERSAL) {
179 /* If OPTIONAL, assume this is OK */
180 if(opt) return -1;
181 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MSTRING_NOT_UNIVERSAL);
182 goto err;
183 }
184 /* Check tag matches bit map */
185 if(!(ASN1_tag2bit(otag) & it->utype)) {
186 /* If OPTIONAL, assume this is OK */
187 if(opt) return -1;
188 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MSTRING_WRONG_TAG);
189 goto err;
190 }
191 return asn1_d2i_ex_primitive(pval, in, len, it, otag, 0, 0, ctx);
192
193 case ASN1_ITYPE_EXTERN:
194 /* Use new style d2i */
195 ef = it->funcs;
196 return ef->asn1_ex_d2i(pval, in, len, it, tag, aclass, opt, ctx);
197
198 case ASN1_ITYPE_COMPAT:
199 /* we must resort to old style evil hackery */
200 cf = it->funcs;
201
202 /* If OPTIONAL see if it is there */
203 if(opt) {
204 int exptag;
205 p = *in;
206 if(tag == -1) exptag = it->utype;
207 else exptag = tag;
208 /* Don't care about anything other than presence of expected tag */
209 ret = asn1_check_tlen(NULL, NULL, NULL, NULL, NULL, &p, len, exptag, aclass, 1, ctx);
210 if(!ret) {
211 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
212 goto err;
213 }
214 if(ret == -1) return -1;
215 }
216 /* This is the old style evil hack IMPLICIT handling:
217 * since the underlying code is expecting a tag and
218 * class other than the one present we change the
219 * buffer temporarily then change it back afterwards.
220 * This doesn't and never did work for tags > 30.
221 *
222 * Yes this is *horrible* but it is only needed for
223 * old style d2i which will hopefully not be around
224 * for much longer.
225 * FIXME: should copy the buffer then modify it so
226 * the input buffer can be const: we should *always*
227 * copy because the old style d2i might modify the
228 * buffer.
229 */
230
231 if(tag != -1) {
232 p = *in;
233 imphack = *p;
234 *p = (unsigned char)((*p & V_ASN1_CONSTRUCTED) | it->utype);
235 }
236
237 ptmpval = cf->asn1_d2i(pval, in, len);
238
239 if(tag != -1) *p = imphack;
240
241 if(ptmpval) return 1;
242 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
243 goto err;
244
245
246 case ASN1_ITYPE_CHOICE:
247 if(asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
248 goto auxerr;
249
250 /* Allocate structure */
251 if(!*pval) {
252 if(!ASN1_item_ex_new(pval, it)) {
253 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
254 goto err;
255 }
256 }
257 /* CHOICE type, try each possibility in turn */
258 pchval = NULL;
259 p = *in;
260 for(i = 0, tt=it->templates; i < it->tcount; i++, tt++) {
261 pchptr = asn1_get_field_ptr(pval, tt);
262 /* We mark field as OPTIONAL so its absence
263 * can be recognised.
264 */
265 ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);
266 /* If field not present, try the next one */
267 if(ret == -1) continue;
268 /* If positive return, read OK, break loop */
269 if(ret > 0) break;
270 /* Otherwise must be an ASN1 parsing error */
271 errtt = tt;
272 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
273 goto err;
274 }
275 /* Did we fall off the end without reading anything? */
276 if(i == it->tcount) {
277 /* If OPTIONAL, this is OK */
278 if(opt) {
279 /* Free and zero it */
280 ASN1_item_ex_free(pval, it);
281 return -1;
282 }
283 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_NO_MATCHING_CHOICE_TYPE);
284 goto err;
285 }
286 asn1_set_choice_selector(pval, i, it);
287 *in = p;
288 if(asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
289 goto auxerr;
290 return 1;
291
292 case ASN1_ITYPE_SEQUENCE:
293 p = *in;
294 tmplen = len;
295
296 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
297 if(tag == -1) {
298 tag = V_ASN1_SEQUENCE;
299 aclass = V_ASN1_UNIVERSAL;
300 }
301 /* Get SEQUENCE length and update len, p */
302 ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst, &p, len, tag, aclass, opt, ctx);
303 if(!ret) {
304 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
305 goto err;
306 } else if(ret == -1) return -1;
307 if(aux && (aux->flags & ASN1_AFLG_BROKEN)) {
308 len = tmplen - (p - *in);
309 seq_nolen = 1;
310 } else seq_nolen = seq_eoc; /* If indefinite we don't do a length check */
311 if(!cst) {
312 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
313 goto err;
314 }
315
316 if(!*pval) {
317 if(!ASN1_item_ex_new(pval, it)) {
318 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
319 goto err;
320 }
321 }
322 if(asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
323 goto auxerr;
324
325 /* Get each field entry */
326 for(i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
327 const ASN1_TEMPLATE *seqtt;
328 ASN1_VALUE **pseqval;
329 seqtt = asn1_do_adb(pval, tt, 1);
330 if(!seqtt) goto err;
331 pseqval = asn1_get_field_ptr(pval, seqtt);
332 /* Have we ran out of data? */
333 if(!len) break;
334 q = p;
335 if(asn1_check_eoc(&p, len)) {
336 if(!seq_eoc) {
337 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_UNEXPECTED_EOC);
338 goto err;
339 }
340 len -= p - q;
341 seq_eoc = 0;
342 q = p;
343 break;
344 }
345 /* This determines the OPTIONAL flag value. The field cannot
346 * be omitted if it is the last of a SEQUENCE and there is
347 * still data to be read. This isn't strictly necessary but
348 * it increases efficiency in some cases.
349 */
350 if(i == (it->tcount - 1)) isopt = 0;
351 else isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
352 /* attempt to read in field, allowing each to be OPTIONAL */
353 ret = asn1_template_ex_d2i(pseqval, &p, len, seqtt, isopt, ctx);
354 if(!ret) {
355 errtt = seqtt;
356 goto err;
357 } else if(ret == -1) {
358 /* OPTIONAL component absent. Free and zero the field
359 */
360 ASN1_template_free(pseqval, seqtt);
361 continue;
362 }
363 /* Update length */
364 len -= p - q;
365 }
366 /* Check for EOC if expecting one */
367 if(seq_eoc && !asn1_check_eoc(&p, len)) {
368 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC);
369 goto err;
370 }
371 /* Check all data read */
372 if(!seq_nolen && len) {
373 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_SEQUENCE_LENGTH_MISMATCH);
374 goto err;
375 }
376
377 /* If we get here we've got no more data in the SEQUENCE,
378 * however we may not have read all fields so check all
379 * remaining are OPTIONAL and clear any that are.
380 */
381 for(; i < it->tcount; tt++, i++) {
382 const ASN1_TEMPLATE *seqtt;
383 seqtt = asn1_do_adb(pval, tt, 1);
384 if(!seqtt) goto err;
385 if(seqtt->flags & ASN1_TFLG_OPTIONAL) {
386 ASN1_VALUE **pseqval;
387 pseqval = asn1_get_field_ptr(pval, seqtt);
388 ASN1_template_free(pseqval, seqtt);
389 } else {
390 errtt = seqtt;
391 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_FIELD_MISSING);
392 goto err;
393 }
394 }
395 /* Save encoding */
396 if(!asn1_enc_save(pval, *in, p - *in, it)) goto auxerr;
397 *in = p;
398 if(asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
399 goto auxerr;
400 return 1;
401
402 default:
403 return 0;
404 }
405 auxerr:
406 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR);
407 err:
408 ASN1_item_ex_free(pval, it);
409 if(errtt) ERR_add_error_data(4, "Field=", errtt->field_name, ", Type=", it->sname);
410 else ERR_add_error_data(2, "Type=", it->sname);
411 return 0;
412 }
413
414 /* Templates are handled with two separate functions. One handles any EXPLICIT tag and the other handles the
415 * rest.
416 */
417
418 static int asn1_template_ex_d2i(ASN1_VALUE **val, unsigned char **in, long inlen, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx)
419 {
420 int flags, aclass;
421 int ret;
422 long len;
423 unsigned char *p, *q;
424 char exp_eoc;
425 if(!val) return 0;
426 flags = tt->flags;
427 aclass = flags & ASN1_TFLG_TAG_CLASS;
428
429 p = *in;
430
431 /* Check if EXPLICIT tag expected */
432 if(flags & ASN1_TFLG_EXPTAG) {
433 char cst;
434 /* Need to work out amount of data available to the inner content and where it
435 * starts: so read in EXPLICIT header to get the info.
436 */
437 ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst, &p, inlen, tt->tag, aclass, opt, ctx);
438 q = p;
439 if(!ret) {
440 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
441 return 0;
442 } else if(ret == -1) return -1;
443 if(!cst) {
444 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
445 return 0;
446 }
447 /* We've found the field so it can't be OPTIONAL now */
448 ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);
449 if(!ret) {
450 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
451 return 0;
452 }
453 /* We read the field in OK so update length */
454 len -= p - q;
455 if(exp_eoc) {
456 /* If NDEF we must have an EOC here */
457 if(!asn1_check_eoc(&p, len)) {
458 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ASN1_R_MISSING_EOC);
459 goto err;
460 }
461 } else {
462 /* Otherwise we must hit the EXPLICIT tag end or its an error */
463 if(len) {
464 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ASN1_R_EXPLICIT_LENGTH_MISMATCH);
465 goto err;
466 }
467 }
468 } else
469 return asn1_template_noexp_d2i(val, in, inlen, tt, opt, ctx);
470
471 *in = p;
472 return 1;
473
474 err:
475 ASN1_template_free(val, tt);
476 *val = NULL;
477 return 0;
478 }
479
480 static int asn1_template_noexp_d2i(ASN1_VALUE **val, unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx)
481 {
482 int flags, aclass;
483 int ret;
484 unsigned char *p, *q;
485 if(!val) return 0;
486 flags = tt->flags;
487 aclass = flags & ASN1_TFLG_TAG_CLASS;
488
489 p = *in;
490 q = p;
491
492 if(flags & ASN1_TFLG_SK_MASK) {
493 /* SET OF, SEQUENCE OF */
494 int sktag, skaclass;
495 char sk_eoc;
496 /* First work out expected inner tag value */
497 if(flags & ASN1_TFLG_IMPTAG) {
498 sktag = tt->tag;
499 skaclass = aclass;
500 } else {
501 skaclass = V_ASN1_UNIVERSAL;
502 if(flags & ASN1_TFLG_SET_OF) sktag = V_ASN1_SET;
503 else sktag = V_ASN1_SEQUENCE;
504 }
505 /* Get the tag */
506 ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL, &p, len, sktag, skaclass, opt, ctx);
507 if(!ret) {
508 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
509 return 0;
510 } else if(ret == -1) return -1;
511 if(!*val) *val = (ASN1_VALUE *)sk_new_null();
512 else {
513 /* We've got a valid STACK: free up any items present */
514 STACK *sktmp = (STACK *)*val;
515 ASN1_VALUE *vtmp;
516 while(sk_num(sktmp) > 0) {
517 vtmp = (ASN1_VALUE *)sk_pop(sktmp);
518 ASN1_item_ex_free(&vtmp, ASN1_ITEM_ptr(tt->item));
519 }
520 }
521
522 if(!*val) {
523 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_MALLOC_FAILURE);
524 goto err;
525 }
526 /* Read as many items as we can */
527 while(len > 0) {
528 ASN1_VALUE *skfield;
529 q = p;
530 /* See if EOC found */
531 if(asn1_check_eoc(&p, len)) {
532 if(!sk_eoc) {
533 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ASN1_R_UNEXPECTED_EOC);
534 goto err;
535 }
536 len -= p - q;
537 sk_eoc = 0;
538 break;
539 }
540 skfield = NULL;
541 if(!ASN1_item_ex_d2i(&skfield, &p, len, ASN1_ITEM_ptr(tt->item), -1, 0, 0, ctx)) {
542 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_NESTED_ASN1_ERROR);
543 goto err;
544 }
545 len -= p - q;
546 if(!sk_push((STACK *)*val, (char *)skfield)) {
547 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_MALLOC_FAILURE);
548 goto err;
549 }
550 }
551 if(sk_eoc) {
552 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ASN1_R_MISSING_EOC);
553 goto err;
554 }
555 } else if(flags & ASN1_TFLG_IMPTAG) {
556 /* IMPLICIT tagging */
557 ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, ctx);
558 if(!ret) {
559 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_NESTED_ASN1_ERROR);
560 goto err;
561 } else if(ret == -1) return -1;
562 } else {
563 /* Nothing special */
564 ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item), -1, 0, opt, ctx);
565 if(!ret) {
566 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_NESTED_ASN1_ERROR);
567 goto err;
568 } else if(ret == -1) return -1;
569 }
570
571 *in = p;
572 return 1;
573
574 err:
575 ASN1_template_free(val, tt);
576 *val = NULL;
577 return 0;
578 }
579
580 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, unsigned char **in, long inlen,
581 const ASN1_ITEM *it,
582 int tag, int aclass, char opt, ASN1_TLC *ctx)
583 {
584 int ret = 0, utype;
585 long plen;
586 char cst, inf, free_cont = 0;
587 unsigned char *p;
588 BUF_MEM buf;
589 unsigned char *cont = NULL;
590 long len;
591 if(!pval) {
592 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL);
593 return 0; /* Should never happen */
594 }
595
596 if(it->itype == ASN1_ITYPE_MSTRING) {
597 utype = tag;
598 tag = -1;
599 } else utype = it->utype;
600
601 if(utype == V_ASN1_ANY) {
602 /* If type is ANY need to figure out type from tag */
603 unsigned char oclass;
604 if(tag >= 0) {
605 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_TAGGED_ANY);
606 return 0;
607 }
608 if(opt) {
609 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_OPTIONAL_ANY);
610 return 0;
611 }
612 p = *in;
613 ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL, &p, inlen, -1, 0, 0, ctx);
614 if(!ret) {
615 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
616 return 0;
617 }
618 if(oclass != V_ASN1_UNIVERSAL) utype = V_ASN1_OTHER;
619 }
620 if(tag == -1) {
621 tag = utype;
622 aclass = V_ASN1_UNIVERSAL;
623 }
624 p = *in;
625 /* Check header */
626 ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst, &p, inlen, tag, aclass, opt, ctx);
627 if(!ret) {
628 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
629 return 0;
630 } else if(ret == -1) return -1;
631 /* SEQUENCE, SET and "OTHER" are left in encoded form */
632 if((utype == V_ASN1_SEQUENCE) || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER)) {
633 /* Clear context cache for type OTHER because the auto clear when
634 * we have a exact match wont work
635 */
636 if(utype == V_ASN1_OTHER) {
637 asn1_tlc_clear(ctx);
638 /* SEQUENCE and SET must be constructed */
639 } else if(!cst) {
640 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_TYPE_NOT_CONSTRUCTED);
641 return 0;
642 }
643
644 cont = *in;
645 /* If indefinite length constructed find the real end */
646 if(inf) {
647 if(!asn1_collect(NULL, &p, plen, inf, -1, -1)) goto err;
648 len = p - cont;
649 } else {
650 len = p - cont + plen;
651 p += plen;
652 buf.data = NULL;
653 }
654 } else if(cst) {
655 buf.length = 0;
656 buf.max = 0;
657 buf.data = NULL;
658 /* Should really check the internal tags are correct but
659 * some things may get this wrong. The relevant specs
660 * say that constructed string types should be OCTET STRINGs
661 * internally irrespective of the type. So instead just check
662 * for UNIVERSAL class and ignore the tag.
663 */
664 if(!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL)) goto err;
665 len = buf.length;
666 /* Append a final null to string */
667 if(!BUF_MEM_grow_clean(&buf, len + 1)) {
668 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
669 return 0;
670 }
671 buf.data[len] = 0;
672 cont = (unsigned char *)buf.data;
673 free_cont = 1;
674 } else {
675 cont = p;
676 len = plen;
677 p += plen;
678 }
679
680 /* We now have content length and type: translate into a structure */
681 if(!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it)) goto err;
682
683 *in = p;
684 ret = 1;
685 err:
686 if(free_cont && buf.data) OPENSSL_free(buf.data);
687 return ret;
688 }
689
690 /* Translate ASN1 content octets into a structure */
691
692 int asn1_ex_c2i(ASN1_VALUE **pval, unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it)
693 {
694 ASN1_VALUE **opval = NULL;
695 ASN1_STRING *stmp;
696 ASN1_TYPE *typ = NULL;
697 int ret = 0;
698 const ASN1_PRIMITIVE_FUNCS *pf;
699 ASN1_INTEGER **tint;
700 pf = it->funcs;
701 if(pf && pf->prim_c2i) return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
702 /* If ANY type clear type and set pointer to internal value */
703 if(it->utype == V_ASN1_ANY) {
704 if(!*pval) {
705 typ = ASN1_TYPE_new();
706 *pval = (ASN1_VALUE *)typ;
707 } else typ = (ASN1_TYPE *)*pval;
708 if(utype != typ->type) ASN1_TYPE_set(typ, utype, NULL);
709 opval = pval;
710 pval = (ASN1_VALUE **)&typ->value.ptr;
711 }
712 switch(utype) {
713 case V_ASN1_OBJECT:
714 if(!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len)) goto err;
715 break;
716
717 case V_ASN1_NULL:
718 if(len) {
719 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_NULL_IS_WRONG_LENGTH);
720 goto err;
721 }
722 *pval = (ASN1_VALUE *)1;
723 break;
724
725 case V_ASN1_BOOLEAN:
726 if(len != 1) {
727 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
728 goto err;
729 } else {
730 ASN1_BOOLEAN *tbool;
731 tbool = (ASN1_BOOLEAN *)pval;
732 *tbool = *cont;
733 }
734 break;
735
736 case V_ASN1_BIT_STRING:
737 if(!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len)) goto err;
738 break;
739
740 case V_ASN1_INTEGER:
741 case V_ASN1_NEG_INTEGER:
742 case V_ASN1_ENUMERATED:
743 case V_ASN1_NEG_ENUMERATED:
744 tint = (ASN1_INTEGER **)pval;
745 if(!c2i_ASN1_INTEGER(tint, &cont, len)) goto err;
746 /* Fixup type to match the expected form */
747 (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
748 break;
749
750 case V_ASN1_OCTET_STRING:
751 case V_ASN1_NUMERICSTRING:
752 case V_ASN1_PRINTABLESTRING:
753 case V_ASN1_T61STRING:
754 case V_ASN1_VIDEOTEXSTRING:
755 case V_ASN1_IA5STRING:
756 case V_ASN1_UTCTIME:
757 case V_ASN1_GENERALIZEDTIME:
758 case V_ASN1_GRAPHICSTRING:
759 case V_ASN1_VISIBLESTRING:
760 case V_ASN1_GENERALSTRING:
761 case V_ASN1_UNIVERSALSTRING:
762 case V_ASN1_BMPSTRING:
763 case V_ASN1_UTF8STRING:
764 case V_ASN1_OTHER:
765 case V_ASN1_SET:
766 case V_ASN1_SEQUENCE:
767 default:
768 /* All based on ASN1_STRING and handled the same */
769 if(!*pval) {
770 stmp = ASN1_STRING_type_new(utype);
771 if(!stmp) {
772 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
773 goto err;
774 }
775 *pval = (ASN1_VALUE *)stmp;
776 } else {
777 stmp = (ASN1_STRING *)*pval;
778 stmp->type = utype;
779 }
780 /* If we've already allocated a buffer use it */
781 if(*free_cont) {
782 if(stmp->data) OPENSSL_free(stmp->data);
783 stmp->data = cont;
784 stmp->length = len;
785 *free_cont = 0;
786 } else {
787 if(!ASN1_STRING_set(stmp, cont, len)) {
788 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
789 ASN1_STRING_free(stmp);
790 *pval = NULL;
791 goto err;
792 }
793 }
794 break;
795 }
796 /* If ASN1_ANY and NULL type fix up value */
797 if(typ && utype==V_ASN1_NULL) typ->value.ptr = NULL;
798
799 ret = 1;
800 err:
801 if(!ret)
802 {
803 ASN1_TYPE_free(typ);
804 if (opval)
805 *opval = NULL;
806 }
807 return ret;
808 }
809
810 /* This function collects the asn1 data from a constructred string
811 * type into a buffer. The values of 'in' and 'len' should refer
812 * to the contents of the constructed type and 'inf' should be set
813 * if it is indefinite length. If 'buf' is NULL then we just want
814 * to find the end of the current structure: useful for indefinite
815 * length constructed stuff.
816 */
817
818 static int asn1_collect(BUF_MEM *buf, unsigned char **in, long len, char inf, int tag, int aclass)
819 {
820 unsigned char *p, *q;
821 long plen;
822 char cst, ininf;
823 p = *in;
824 inf &= 1;
825 /* If no buffer and not indefinite length constructed just pass over the encoded data */
826 if(!buf && !inf) {
827 *in += len;
828 return 1;
829 }
830 while(len > 0) {
831 q = p;
832 /* Check for EOC */
833 if(asn1_check_eoc(&p, len)) {
834 /* EOC is illegal outside indefinite length constructed form */
835 if(!inf) {
836 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_UNEXPECTED_EOC);
837 return 0;
838 }
839 inf = 0;
840 break;
841 }
842 if(!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p, len, tag, aclass, 0, NULL)) {
843 ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
844 return 0;
845 }
846 /* If indefinite length constructed update max length */
847 if(cst) {
848 if(!asn1_collect(buf, &p, plen, ininf, tag, aclass)) return 0;
849 } else {
850 if(!collect_data(buf, &p, plen)) return 0;
851 }
852 len -= p - q;
853 }
854 if(inf) {
855 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
856 return 0;
857 }
858 *in = p;
859 return 1;
860 }
861
862 static int collect_data(BUF_MEM *buf, unsigned char **p, long plen)
863 {
864 int len;
865 if(buf) {
866 len = buf->length;
867 if(!BUF_MEM_grow_clean(buf, len + plen)) {
868 ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE);
869 return 0;
870 }
871 memcpy(buf->data + len, *p, plen);
872 }
873 *p += plen;
874 return 1;
875 }
876
877 /* Check for ASN1 EOC and swallow it if found */
878
879 static int asn1_check_eoc(unsigned char **in, long len)
880 {
881 unsigned char *p;
882 if(len < 2) return 0;
883 p = *in;
884 if(!p[0] && !p[1]) {
885 *in += 2;
886 return 1;
887 }
888 return 0;
889 }
890
891 /* Check an ASN1 tag and length: a bit like ASN1_get_object
892 * but it sets the length for indefinite length constructed
893 * form, we don't know the exact length but we can set an
894 * upper bound to the amount of data available minus the
895 * header length just read.
896 */
897
898 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, char *inf, char *cst,
899 unsigned char **in, long len, int exptag, int expclass, char opt, ASN1_TLC *ctx)
900 {
901 int i;
902 int ptag, pclass;
903 long plen;
904 unsigned char *p, *q;
905 p = *in;
906 q = p;
907
908 if(ctx && ctx->valid) {
909 i = ctx->ret;
910 plen = ctx->plen;
911 pclass = ctx->pclass;
912 ptag = ctx->ptag;
913 p += ctx->hdrlen;
914 } else {
915 i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);
916 if(ctx) {
917 ctx->ret = i;
918 ctx->plen = plen;
919 ctx->pclass = pclass;
920 ctx->ptag = ptag;
921 ctx->hdrlen = p - q;
922 ctx->valid = 1;
923 /* If definite length, and no error, length +
924 * header can't exceed total amount of data available.
925 */
926 if(!(i & 0x81) && ((plen + ctx->hdrlen) > len)) {
927 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_TOO_LONG);
928 asn1_tlc_clear(ctx);
929 return 0;
930 }
931 }
932 }
933
934 if(i & 0x80) {
935 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER);
936 asn1_tlc_clear(ctx);
937 return 0;
938 }
939 if(exptag >= 0) {
940 if((exptag != ptag) || (expclass != pclass)) {
941 /* If type is OPTIONAL, not an error, but indicate missing
942 * type.
943 */
944 if(opt) return -1;
945 asn1_tlc_clear(ctx);
946 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG);
947 return 0;
948 }
949 /* We have a tag and class match, so assume we are going to do something with it */
950 asn1_tlc_clear(ctx);
951 }
952
953 if(i & 1) plen = len - (p - q);
954
955 if(inf) *inf = i & 1;
956
957 if(cst) *cst = i & V_ASN1_CONSTRUCTED;
958
959 if(olen) *olen = plen;
960 if(oclass) *oclass = pclass;
961 if(otag) *otag = ptag;
962
963 *in = p;
964 return 1;
965 }
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