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authorcvs2svn <admin@example.com>2008-02-26 10:48:17 +0000
committercvs2svn <admin@example.com>2008-02-26 10:48:17 +0000
commitf73a33b004c9c6281768846f2609a4496ce518a3 (patch)
treecd1f342f086d6b52c792f34136f57e906cf705e8 /src/lib/libcrypto/asn1/tasn_dec.c
parentb89c0dd40131bd782fa134e50e256db35c015e98 (diff)
downloadopenbsd-OPENBSD_4_3_BASE.tar.gz
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openbsd-OPENBSD_4_3_BASE.zip
This commit was manufactured by cvs2git to create tag 'OPENBSD_4_3_BASE'.OPENBSD_4_3_BASE
Diffstat (limited to 'src/lib/libcrypto/asn1/tasn_dec.c')
-rw-r--r--src/lib/libcrypto/asn1/tasn_dec.c1023
1 files changed, 0 insertions, 1023 deletions
diff --git a/src/lib/libcrypto/asn1/tasn_dec.c b/src/lib/libcrypto/asn1/tasn_dec.c
deleted file mode 100644
index b7e916ef36..0000000000
--- a/src/lib/libcrypto/asn1/tasn_dec.c
+++ /dev/null
@@ -1,1023 +0,0 @@
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
68static int asn1_check_eoc(unsigned char **in, long len);
69static int asn1_find_end(unsigned char **in, long len, char inf);
70static int asn1_collect(BUF_MEM *buf, unsigned char **in, long len, char inf, int tag, int aclass);
71static int collect_data(BUF_MEM *buf, unsigned char **p, long plen);
72static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, char *inf, char *cst,
73 unsigned char **in, long len, int exptag, int expclass, char opt, ASN1_TLC *ctx);
74static int asn1_template_ex_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx);
75static int asn1_template_noexp_d2i(ASN1_VALUE **val, unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx);
76static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, unsigned char **in, long len,
77 const ASN1_ITEM *it, int tag, int aclass, char opt, ASN1_TLC *ctx);
78
79/* Table to convert tags to bit values, used for MSTRING type */
80static unsigned long tag2bit[32]={
810, 0, 0, B_ASN1_BIT_STRING, /* tags 0 - 3 */
82B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN,/* tags 4- 7 */
83B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,/* tags 8-11 */
84B_ASN1_UTF8STRING,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,/* tags 12-15 */
850, 0, B_ASN1_NUMERICSTRING,B_ASN1_PRINTABLESTRING, /* tags 16-19 */
86B_ASN1_T61STRING,B_ASN1_VIDEOTEXSTRING,B_ASN1_IA5STRING, /* tags 20-22 */
87B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME, /* tags 23-24 */
88B_ASN1_GRAPHICSTRING,B_ASN1_ISO64STRING,B_ASN1_GENERALSTRING, /* tags 25-27 */
89B_ASN1_UNIVERSALSTRING,B_ASN1_UNKNOWN,B_ASN1_BMPSTRING,B_ASN1_UNKNOWN, /* tags 28-31 */
90 };
91
92unsigned long ASN1_tag2bit(int tag)
93{
94 if((tag < 0) || (tag > 30)) return 0;
95 return tag2bit[tag];
96}
97
98/* Macro to initialize and invalidate the cache */
99
100#define asn1_tlc_clear(c) if(c) (c)->valid = 0
101
102/* Decode an ASN1 item, this currently behaves just
103 * like a standard 'd2i' function. 'in' points to
104 * a buffer to read the data from, in future we will
105 * have more advanced versions that can input data
106 * a piece at a time and this will simply be a special
107 * case.
108 */
109
110ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_ITEM *it)
111{
112 ASN1_TLC c;
113 ASN1_VALUE *ptmpval = NULL;
114 if(!pval) pval = &ptmpval;
115 asn1_tlc_clear(&c);
116 if(ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0)
117 return *pval;
118 return NULL;
119}
120
121int ASN1_template_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_TEMPLATE *tt)
122{
123 ASN1_TLC c;
124 asn1_tlc_clear(&c);
125 return asn1_template_ex_d2i(pval, in, len, tt, 0, &c);
126}
127
128
129/* Decode an item, taking care of IMPLICIT tagging, if any.
130 * If 'opt' set and tag mismatch return -1 to handle OPTIONAL
131 */
132
133int ASN1_item_ex_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_ITEM *it,
134 int tag, int aclass, char opt, ASN1_TLC *ctx)
135{
136 const ASN1_TEMPLATE *tt, *errtt = NULL;
137 const ASN1_COMPAT_FUNCS *cf;
138 const ASN1_EXTERN_FUNCS *ef;
139 const ASN1_AUX *aux = it->funcs;
140 ASN1_aux_cb *asn1_cb;
141 unsigned char *p, *q, imphack = 0, oclass;
142 char seq_eoc, seq_nolen, cst, isopt;
143 long tmplen;
144 int i;
145 int otag;
146 int ret = 0;
147 ASN1_VALUE *pchval, **pchptr, *ptmpval;
148 if(!pval) return 0;
149 if(aux && aux->asn1_cb) asn1_cb = aux->asn1_cb;
150 else asn1_cb = 0;
151
152 switch(it->itype) {
153
154 case ASN1_ITYPE_PRIMITIVE:
155 if(it->templates) {
156 /* tagging or OPTIONAL is currently illegal on an item template
157 * because the flags can't get passed down. In practice this isn't
158 * a problem: we include the relevant flags from the item template
159 * in the template itself.
160 */
161 if ((tag != -1) || opt) {
162 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
163 goto err;
164 }
165 return asn1_template_ex_d2i(pval, in, len, it->templates, opt, ctx);
166 }
167 return asn1_d2i_ex_primitive(pval, in, len, it, tag, aclass, opt, ctx);
168 break;
169
170 case ASN1_ITYPE_MSTRING:
171 p = *in;
172 /* Just read in tag and class */
173 ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL, &p, len, -1, 0, 1, ctx);
174 if(!ret) {
175 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
176 goto err;
177 }
178 /* Must be UNIVERSAL class */
179 if(oclass != V_ASN1_UNIVERSAL) {
180 /* If OPTIONAL, assume this is OK */
181 if(opt) return -1;
182 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MSTRING_NOT_UNIVERSAL);
183 goto err;
184 }
185 /* Check tag matches bit map */
186 if(!(ASN1_tag2bit(otag) & it->utype)) {
187 /* If OPTIONAL, assume this is OK */
188 if(opt) return -1;
189 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MSTRING_WRONG_TAG);
190 goto err;
191 }
192 return asn1_d2i_ex_primitive(pval, in, len, it, otag, 0, 0, ctx);
193
194 case ASN1_ITYPE_EXTERN:
195 /* Use new style d2i */
196 ef = it->funcs;
197 return ef->asn1_ex_d2i(pval, in, len, it, tag, aclass, opt, ctx);
198
199 case ASN1_ITYPE_COMPAT:
200 /* we must resort to old style evil hackery */
201 cf = it->funcs;
202
203 /* If OPTIONAL see if it is there */
204 if(opt) {
205 int exptag;
206 p = *in;
207 if(tag == -1) exptag = it->utype;
208 else exptag = tag;
209 /* Don't care about anything other than presence of expected tag */
210 ret = asn1_check_tlen(NULL, NULL, NULL, NULL, NULL, &p, len, exptag, aclass, 1, ctx);
211 if(!ret) {
212 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
213 goto err;
214 }
215 if(ret == -1) return -1;
216 }
217 /* This is the old style evil hack IMPLICIT handling:
218 * since the underlying code is expecting a tag and
219 * class other than the one present we change the
220 * buffer temporarily then change it back afterwards.
221 * This doesn't and never did work for tags > 30.
222 *
223 * Yes this is *horrible* but it is only needed for
224 * old style d2i which will hopefully not be around
225 * for much longer.
226 * FIXME: should copy the buffer then modify it so
227 * the input buffer can be const: we should *always*
228 * copy because the old style d2i might modify the
229 * buffer.
230 */
231
232 if(tag != -1) {
233 p = *in;
234 imphack = *p;
235 *p = (unsigned char)((*p & V_ASN1_CONSTRUCTED) | it->utype);
236 }
237
238 ptmpval = cf->asn1_d2i(pval, in, len);
239
240 if(tag != -1) *p = imphack;
241
242 if(ptmpval) return 1;
243 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
244 goto err;
245
246
247 case ASN1_ITYPE_CHOICE:
248 if(asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
249 goto auxerr;
250
251 /* Allocate structure */
252 if(!*pval) {
253 if(!ASN1_item_ex_new(pval, it)) {
254 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
255 goto err;
256 }
257 }
258 /* CHOICE type, try each possibility in turn */
259 pchval = NULL;
260 p = *in;
261 for(i = 0, tt=it->templates; i < it->tcount; i++, tt++) {
262 pchptr = asn1_get_field_ptr(pval, tt);
263 /* We mark field as OPTIONAL so its absence
264 * can be recognised.
265 */
266 ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);
267 /* If field not present, try the next one */
268 if(ret == -1) continue;
269 /* If positive return, read OK, break loop */
270 if(ret > 0) break;
271 /* Otherwise must be an ASN1 parsing error */
272 errtt = tt;
273 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
274 goto err;
275 }
276 /* Did we fall off the end without reading anything? */
277 if(i == it->tcount) {
278 /* If OPTIONAL, this is OK */
279 if(opt) {
280 /* Free and zero it */
281 ASN1_item_ex_free(pval, it);
282 return -1;
283 }
284 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_NO_MATCHING_CHOICE_TYPE);
285 goto err;
286 }
287 asn1_set_choice_selector(pval, i, it);
288 *in = p;
289 if(asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
290 goto auxerr;
291 return 1;
292
293 case ASN1_ITYPE_SEQUENCE:
294 p = *in;
295 tmplen = len;
296
297 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
298 if(tag == -1) {
299 tag = V_ASN1_SEQUENCE;
300 aclass = V_ASN1_UNIVERSAL;
301 }
302 /* Get SEQUENCE length and update len, p */
303 ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst, &p, len, tag, aclass, opt, ctx);
304 if(!ret) {
305 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
306 goto err;
307 } else if(ret == -1) return -1;
308 if(aux && (aux->flags & ASN1_AFLG_BROKEN)) {
309 len = tmplen - (p - *in);
310 seq_nolen = 1;
311 } else seq_nolen = seq_eoc; /* If indefinite we don't do a length check */
312 if(!cst) {
313 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
314 goto err;
315 }
316
317 if(!*pval) {
318 if(!ASN1_item_ex_new(pval, it)) {
319 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
320 goto err;
321 }
322 }
323 if(asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
324 goto auxerr;
325
326 /* Get each field entry */
327 for(i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
328 const ASN1_TEMPLATE *seqtt;
329 ASN1_VALUE **pseqval;
330 seqtt = asn1_do_adb(pval, tt, 1);
331 if(!seqtt) goto err;
332 pseqval = asn1_get_field_ptr(pval, seqtt);
333 /* Have we ran out of data? */
334 if(!len) break;
335 q = p;
336 if(asn1_check_eoc(&p, len)) {
337 if(!seq_eoc) {
338 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_UNEXPECTED_EOC);
339 goto err;
340 }
341 len -= p - q;
342 seq_eoc = 0;
343 q = p;
344 break;
345 }
346 /* This determines the OPTIONAL flag value. The field cannot
347 * be omitted if it is the last of a SEQUENCE and there is
348 * still data to be read. This isn't strictly necessary but
349 * it increases efficiency in some cases.
350 */
351 if(i == (it->tcount - 1)) isopt = 0;
352 else isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
353 /* attempt to read in field, allowing each to be OPTIONAL */
354 ret = asn1_template_ex_d2i(pseqval, &p, len, seqtt, isopt, ctx);
355 if(!ret) {
356 errtt = seqtt;
357 goto err;
358 } else if(ret == -1) {
359 /* OPTIONAL component absent. Free and zero the field
360 */
361 ASN1_template_free(pseqval, seqtt);
362 continue;
363 }
364 /* Update length */
365 len -= p - q;
366 }
367 /* Check for EOC if expecting one */
368 if(seq_eoc && !asn1_check_eoc(&p, len)) {
369 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC);
370 goto err;
371 }
372 /* Check all data read */
373 if(!seq_nolen && len) {
374 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_SEQUENCE_LENGTH_MISMATCH);
375 goto err;
376 }
377
378 /* If we get here we've got no more data in the SEQUENCE,
379 * however we may not have read all fields so check all
380 * remaining are OPTIONAL and clear any that are.
381 */
382 for(; i < it->tcount; tt++, i++) {
383 const ASN1_TEMPLATE *seqtt;
384 seqtt = asn1_do_adb(pval, tt, 1);
385 if(!seqtt) goto err;
386 if(seqtt->flags & ASN1_TFLG_OPTIONAL) {
387 ASN1_VALUE **pseqval;
388 pseqval = asn1_get_field_ptr(pval, seqtt);
389 ASN1_template_free(pseqval, seqtt);
390 } else {
391 errtt = seqtt;
392 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_FIELD_MISSING);
393 goto err;
394 }
395 }
396 /* Save encoding */
397 if(!asn1_enc_save(pval, *in, p - *in, it)) goto auxerr;
398 *in = p;
399 if(asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
400 goto auxerr;
401 return 1;
402
403 default:
404 return 0;
405 }
406 auxerr:
407 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR);
408 err:
409 ASN1_item_ex_free(pval, it);
410 if(errtt) ERR_add_error_data(4, "Field=", errtt->field_name, ", Type=", it->sname);
411 else ERR_add_error_data(2, "Type=", it->sname);
412 return 0;
413}
414
415/* Templates are handled with two separate functions. One handles any EXPLICIT tag and the other handles the
416 * rest.
417 */
418
419static int asn1_template_ex_d2i(ASN1_VALUE **val, unsigned char **in, long inlen, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx)
420{
421 int flags, aclass;
422 int ret;
423 long len;
424 unsigned char *p, *q;
425 char exp_eoc;
426 if(!val) return 0;
427 flags = tt->flags;
428 aclass = flags & ASN1_TFLG_TAG_CLASS;
429
430 p = *in;
431
432 /* Check if EXPLICIT tag expected */
433 if(flags & ASN1_TFLG_EXPTAG) {
434 char cst;
435 /* Need to work out amount of data available to the inner content and where it
436 * starts: so read in EXPLICIT header to get the info.
437 */
438 ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst, &p, inlen, tt->tag, aclass, opt, ctx);
439 q = p;
440 if(!ret) {
441 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
442 return 0;
443 } else if(ret == -1) return -1;
444 if(!cst) {
445 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
446 return 0;
447 }
448 /* We've found the field so it can't be OPTIONAL now */
449 ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);
450 if(!ret) {
451 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
452 return 0;
453 }
454 /* We read the field in OK so update length */
455 len -= p - q;
456 if(exp_eoc) {
457 /* If NDEF we must have an EOC here */
458 if(!asn1_check_eoc(&p, len)) {
459 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ASN1_R_MISSING_EOC);
460 goto err;
461 }
462 } else {
463 /* Otherwise we must hit the EXPLICIT tag end or its an error */
464 if(len) {
465 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ASN1_R_EXPLICIT_LENGTH_MISMATCH);
466 goto err;
467 }
468 }
469 } else
470 return asn1_template_noexp_d2i(val, in, inlen, tt, opt, ctx);
471
472 *in = p;
473 return 1;
474
475 err:
476 ASN1_template_free(val, tt);
477 *val = NULL;
478 return 0;
479}
480
481static int asn1_template_noexp_d2i(ASN1_VALUE **val, unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx)
482{
483 int flags, aclass;
484 int ret;
485 unsigned char *p, *q;
486 if(!val) return 0;
487 flags = tt->flags;
488 aclass = flags & ASN1_TFLG_TAG_CLASS;
489
490 p = *in;
491 q = p;
492
493 if(flags & ASN1_TFLG_SK_MASK) {
494 /* SET OF, SEQUENCE OF */
495 int sktag, skaclass;
496 char sk_eoc;
497 /* First work out expected inner tag value */
498 if(flags & ASN1_TFLG_IMPTAG) {
499 sktag = tt->tag;
500 skaclass = aclass;
501 } else {
502 skaclass = V_ASN1_UNIVERSAL;
503 if(flags & ASN1_TFLG_SET_OF) sktag = V_ASN1_SET;
504 else sktag = V_ASN1_SEQUENCE;
505 }
506 /* Get the tag */
507 ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL, &p, len, sktag, skaclass, opt, ctx);
508 if(!ret) {
509 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
510 return 0;
511 } else if(ret == -1) return -1;
512 if(!*val) *val = (ASN1_VALUE *)sk_new_null();
513 else {
514 /* We've got a valid STACK: free up any items present */
515 STACK *sktmp = (STACK *)*val;
516 ASN1_VALUE *vtmp;
517 while(sk_num(sktmp) > 0) {
518 vtmp = (ASN1_VALUE *)sk_pop(sktmp);
519 ASN1_item_ex_free(&vtmp, ASN1_ITEM_ptr(tt->item));
520 }
521 }
522
523 if(!*val) {
524 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_MALLOC_FAILURE);
525 goto err;
526 }
527 /* Read as many items as we can */
528 while(len > 0) {
529 ASN1_VALUE *skfield;
530 q = p;
531 /* See if EOC found */
532 if(asn1_check_eoc(&p, len)) {
533 if(!sk_eoc) {
534 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ASN1_R_UNEXPECTED_EOC);
535 goto err;
536 }
537 len -= p - q;
538 sk_eoc = 0;
539 break;
540 }
541 skfield = NULL;
542 if(!ASN1_item_ex_d2i(&skfield, &p, len, ASN1_ITEM_ptr(tt->item), -1, 0, 0, ctx)) {
543 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_NESTED_ASN1_ERROR);
544 goto err;
545 }
546 len -= p - q;
547 if(!sk_push((STACK *)*val, (char *)skfield)) {
548 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_MALLOC_FAILURE);
549 goto err;
550 }
551 }
552 if(sk_eoc) {
553 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ASN1_R_MISSING_EOC);
554 goto err;
555 }
556 } else if(flags & ASN1_TFLG_IMPTAG) {
557 /* IMPLICIT tagging */
558 ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, ctx);
559 if(!ret) {
560 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_NESTED_ASN1_ERROR);
561 goto err;
562 } else if(ret == -1) return -1;
563 } else {
564 /* Nothing special */
565 ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item), -1, 0, opt, ctx);
566 if(!ret) {
567 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_NESTED_ASN1_ERROR);
568 goto err;
569 } else if(ret == -1) return -1;
570 }
571
572 *in = p;
573 return 1;
574
575 err:
576 ASN1_template_free(val, tt);
577 *val = NULL;
578 return 0;
579}
580
581static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, unsigned char **in, long inlen,
582 const ASN1_ITEM *it,
583 int tag, int aclass, char opt, ASN1_TLC *ctx)
584{
585 int ret = 0, utype;
586 long plen;
587 char cst, inf, free_cont = 0;
588 unsigned char *p;
589 BUF_MEM buf;
590 unsigned char *cont = NULL;
591 long len;
592 if(!pval) {
593 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL);
594 return 0; /* Should never happen */
595 }
596
597 if(it->itype == ASN1_ITYPE_MSTRING) {
598 utype = tag;
599 tag = -1;
600 } else utype = it->utype;
601
602 if(utype == V_ASN1_ANY) {
603 /* If type is ANY need to figure out type from tag */
604 unsigned char oclass;
605 if(tag >= 0) {
606 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_TAGGED_ANY);
607 return 0;
608 }
609 if(opt) {
610 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_OPTIONAL_ANY);
611 return 0;
612 }
613 p = *in;
614 ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL, &p, inlen, -1, 0, 0, ctx);
615 if(!ret) {
616 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
617 return 0;
618 }
619 if(oclass != V_ASN1_UNIVERSAL) utype = V_ASN1_OTHER;
620 }
621 if(tag == -1) {
622 tag = utype;
623 aclass = V_ASN1_UNIVERSAL;
624 }
625 p = *in;
626 /* Check header */
627 ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst, &p, inlen, tag, aclass, opt, ctx);
628 if(!ret) {
629 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
630 return 0;
631 } else if(ret == -1) return -1;
632
633 ret = 0;
634 /* SEQUENCE, SET and "OTHER" are left in encoded form */
635 if((utype == V_ASN1_SEQUENCE) || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER)) {
636 /* Clear context cache for type OTHER because the auto clear when
637 * we have a exact match wont work
638 */
639 if(utype == V_ASN1_OTHER) {
640 asn1_tlc_clear(ctx);
641 /* SEQUENCE and SET must be constructed */
642 } else if(!cst) {
643 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_TYPE_NOT_CONSTRUCTED);
644 return 0;
645 }
646
647 cont = *in;
648 /* If indefinite length constructed find the real end */
649 if(inf) {
650 if(!asn1_find_end(&p, plen, inf)) goto err;
651 len = p - cont;
652 } else {
653 len = p - cont + plen;
654 p += plen;
655 buf.data = NULL;
656 }
657 } else if(cst) {
658 buf.length = 0;
659 buf.max = 0;
660 buf.data = NULL;
661 /* Should really check the internal tags are correct but
662 * some things may get this wrong. The relevant specs
663 * say that constructed string types should be OCTET STRINGs
664 * internally irrespective of the type. So instead just check
665 * for UNIVERSAL class and ignore the tag.
666 */
667 if(!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL)) goto err;
668 len = buf.length;
669 /* Append a final null to string */
670 if(!BUF_MEM_grow_clean(&buf, len + 1)) {
671 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
672 return 0;
673 }
674 buf.data[len] = 0;
675 cont = (unsigned char *)buf.data;
676 free_cont = 1;
677 } else {
678 cont = p;
679 len = plen;
680 p += plen;
681 }
682
683 /* We now have content length and type: translate into a structure */
684 if(!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it)) goto err;
685
686 *in = p;
687 ret = 1;
688 err:
689 if(free_cont && buf.data) OPENSSL_free(buf.data);
690 return ret;
691}
692
693/* Translate ASN1 content octets into a structure */
694
695int asn1_ex_c2i(ASN1_VALUE **pval, unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it)
696{
697 ASN1_VALUE **opval = NULL;
698 ASN1_STRING *stmp;
699 ASN1_TYPE *typ = NULL;
700 int ret = 0;
701 const ASN1_PRIMITIVE_FUNCS *pf;
702 ASN1_INTEGER **tint;
703 pf = it->funcs;
704 if(pf && pf->prim_c2i) return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
705 /* If ANY type clear type and set pointer to internal value */
706 if(it->utype == V_ASN1_ANY) {
707 if(!*pval) {
708 typ = ASN1_TYPE_new();
709 *pval = (ASN1_VALUE *)typ;
710 } else typ = (ASN1_TYPE *)*pval;
711 if(utype != typ->type) ASN1_TYPE_set(typ, utype, NULL);
712 opval = pval;
713 pval = (ASN1_VALUE **)&typ->value.ptr;
714 }
715 switch(utype) {
716 case V_ASN1_OBJECT:
717 if(!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len)) goto err;
718 break;
719
720 case V_ASN1_NULL:
721 if(len) {
722 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_NULL_IS_WRONG_LENGTH);
723 goto err;
724 }
725 *pval = (ASN1_VALUE *)1;
726 break;
727
728 case V_ASN1_BOOLEAN:
729 if(len != 1) {
730 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
731 goto err;
732 } else {
733 ASN1_BOOLEAN *tbool;
734 tbool = (ASN1_BOOLEAN *)pval;
735 *tbool = *cont;
736 }
737 break;
738
739 case V_ASN1_BIT_STRING:
740 if(!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len)) goto err;
741 break;
742
743 case V_ASN1_INTEGER:
744 case V_ASN1_NEG_INTEGER:
745 case V_ASN1_ENUMERATED:
746 case V_ASN1_NEG_ENUMERATED:
747 tint = (ASN1_INTEGER **)pval;
748 if(!c2i_ASN1_INTEGER(tint, &cont, len)) goto err;
749 /* Fixup type to match the expected form */
750 (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
751 break;
752
753 case V_ASN1_OCTET_STRING:
754 case V_ASN1_NUMERICSTRING:
755 case V_ASN1_PRINTABLESTRING:
756 case V_ASN1_T61STRING:
757 case V_ASN1_VIDEOTEXSTRING:
758 case V_ASN1_IA5STRING:
759 case V_ASN1_UTCTIME:
760 case V_ASN1_GENERALIZEDTIME:
761 case V_ASN1_GRAPHICSTRING:
762 case V_ASN1_VISIBLESTRING:
763 case V_ASN1_GENERALSTRING:
764 case V_ASN1_UNIVERSALSTRING:
765 case V_ASN1_BMPSTRING:
766 case V_ASN1_UTF8STRING:
767 case V_ASN1_OTHER:
768 case V_ASN1_SET:
769 case V_ASN1_SEQUENCE:
770 default:
771 /* All based on ASN1_STRING and handled the same */
772 if(!*pval) {
773 stmp = ASN1_STRING_type_new(utype);
774 if(!stmp) {
775 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
776 goto err;
777 }
778 *pval = (ASN1_VALUE *)stmp;
779 } else {
780 stmp = (ASN1_STRING *)*pval;
781 stmp->type = utype;
782 }
783 /* If we've already allocated a buffer use it */
784 if(*free_cont) {
785 if(stmp->data) OPENSSL_free(stmp->data);
786 stmp->data = cont;
787 stmp->length = len;
788 *free_cont = 0;
789 } else {
790 if(!ASN1_STRING_set(stmp, cont, len)) {
791 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
792 ASN1_STRING_free(stmp);
793 *pval = NULL;
794 goto err;
795 }
796 }
797 break;
798 }
799 /* If ASN1_ANY and NULL type fix up value */
800 if(typ && utype==V_ASN1_NULL) typ->value.ptr = NULL;
801
802 ret = 1;
803 err:
804 if(!ret)
805 {
806 ASN1_TYPE_free(typ);
807 if (opval)
808 *opval = NULL;
809 }
810 return ret;
811}
812
813/* This function finds the end of an ASN1 structure when passed its maximum
814 * length, whether it is indefinite length and a pointer to the content.
815 * This is more efficient than calling asn1_collect because it does not
816 * recurse on each indefinite length header.
817 */
818
819static int asn1_find_end(unsigned char **in, long len, char inf)
820 {
821 int expected_eoc;
822 long plen;
823 unsigned char *p = *in, *q;
824 /* If not indefinite length constructed just add length */
825 if (inf == 0)
826 {
827 *in += len;
828 return 1;
829 }
830 expected_eoc = 1;
831 /* Indefinite length constructed form. Find the end when enough EOCs
832 * are found. If more indefinite length constructed headers
833 * are encountered increment the expected eoc count otherwise justi
834 * skip to the end of the data.
835 */
836 while (len > 0)
837 {
838 if(asn1_check_eoc(&p, len))
839 {
840 expected_eoc--;
841 if (expected_eoc == 0)
842 break;
843 len -= 2;
844 continue;
845 }
846 q = p;
847 /* Just read in a header: only care about the length */
848 if(!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len,
849 -1, 0, 0, NULL))
850 {
851 ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR);
852 return 0;
853 }
854 if (inf)
855 expected_eoc++;
856 else
857 p += plen;
858 len -= p - q;
859 }
860 if (expected_eoc)
861 {
862 ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC);
863 return 0;
864 }
865 *in = p;
866 return 1;
867 }
868
869/* This function collects the asn1 data from a constructred string
870 * type into a buffer. The values of 'in' and 'len' should refer
871 * to the contents of the constructed type and 'inf' should be set
872 * if it is indefinite length.
873 */
874
875static int asn1_collect(BUF_MEM *buf, unsigned char **in, long len, char inf, int tag, int aclass)
876{
877 unsigned char *p, *q;
878 long plen;
879 char cst, ininf;
880 p = *in;
881 inf &= 1;
882 while(len > 0) {
883 q = p;
884 /* Check for EOC */
885 if(asn1_check_eoc(&p, len)) {
886 /* EOC is illegal outside indefinite length constructed form */
887 if(!inf) {
888 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_UNEXPECTED_EOC);
889 return 0;
890 }
891 inf = 0;
892 break;
893 }
894 if(!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p, len, tag, aclass, 0, NULL)) {
895 ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
896 return 0;
897 }
898 /* If indefinite length constructed update max length */
899 if(cst) {
900#ifdef OPENSSL_ALLOW_NESTED_ASN1_STRINGS
901 if (!asn1_collect(buf, &p, plen, ininf, tag, aclass))
902 return 0;
903#else
904 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_NESTED_ASN1_STRING);
905 return 0;
906#endif
907 } else {
908 if(plen && !collect_data(buf, &p, plen)) return 0;
909 }
910 len -= p - q;
911 }
912 if(inf) {
913 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
914 return 0;
915 }
916 *in = p;
917 return 1;
918}
919
920static int collect_data(BUF_MEM *buf, unsigned char **p, long plen)
921{
922 int len;
923 if(buf) {
924 len = buf->length;
925 if(!BUF_MEM_grow_clean(buf, len + plen)) {
926 ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE);
927 return 0;
928 }
929 memcpy(buf->data + len, *p, plen);
930 }
931 *p += plen;
932 return 1;
933}
934
935/* Check for ASN1 EOC and swallow it if found */
936
937static int asn1_check_eoc(unsigned char **in, long len)
938{
939 unsigned char *p;
940 if(len < 2) return 0;
941 p = *in;
942 if(!p[0] && !p[1]) {
943 *in += 2;
944 return 1;
945 }
946 return 0;
947}
948
949/* Check an ASN1 tag and length: a bit like ASN1_get_object
950 * but it sets the length for indefinite length constructed
951 * form, we don't know the exact length but we can set an
952 * upper bound to the amount of data available minus the
953 * header length just read.
954 */
955
956static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, char *inf, char *cst,
957 unsigned char **in, long len, int exptag, int expclass, char opt, ASN1_TLC *ctx)
958{
959 int i;
960 int ptag, pclass;
961 long plen;
962 unsigned char *p, *q;
963 p = *in;
964 q = p;
965
966 if(ctx && ctx->valid) {
967 i = ctx->ret;
968 plen = ctx->plen;
969 pclass = ctx->pclass;
970 ptag = ctx->ptag;
971 p += ctx->hdrlen;
972 } else {
973 i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);
974 if(ctx) {
975 ctx->ret = i;
976 ctx->plen = plen;
977 ctx->pclass = pclass;
978 ctx->ptag = ptag;
979 ctx->hdrlen = p - q;
980 ctx->valid = 1;
981 /* If definite length, and no error, length +
982 * header can't exceed total amount of data available.
983 */
984 if(!(i & 0x81) && ((plen + ctx->hdrlen) > len)) {
985 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_TOO_LONG);
986 asn1_tlc_clear(ctx);
987 return 0;
988 }
989 }
990 }
991
992 if(i & 0x80) {
993 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER);
994 asn1_tlc_clear(ctx);
995 return 0;
996 }
997 if(exptag >= 0) {
998 if((exptag != ptag) || (expclass != pclass)) {
999 /* If type is OPTIONAL, not an error, but indicate missing
1000 * type.
1001 */
1002 if(opt) return -1;
1003 asn1_tlc_clear(ctx);
1004 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG);
1005 return 0;
1006 }
1007 /* We have a tag and class match, so assume we are going to do something with it */
1008 asn1_tlc_clear(ctx);
1009 }
1010
1011 if(i & 1) plen = len - (p - q);
1012
1013 if(inf) *inf = i & 1;
1014
1015 if(cst) *cst = i & V_ASN1_CONSTRUCTED;
1016
1017 if(olen) *olen = plen;
1018 if(oclass) *oclass = pclass;
1019 if(otag) *otag = ptag;
1020
1021 *in = p;
1022 return 1;
1023}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-12-27 03:43:23 +0000