Import OpenSSL 1.0.1q.
[dragonfly.git] / crypto / openssl / crypto / asn1 / tasn_dec.c
CommitLineData
56276539 1/* tasn_dec.c */
9eaaad39
SW
2/*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4 * 2000.
56276539
SS
5 */
6/* ====================================================================
7 * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
9eaaad39 14 * notice, this list of conditions and the following disclaimer.
56276539
SS
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59
56276539
SS
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(const unsigned char **in, long len);
69static int asn1_find_end(const unsigned char **in, long len, char inf);
70
71static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
9eaaad39 72 char inf, int tag, int aclass, int depth);
56276539
SS
73
74static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen);
75
76static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
9eaaad39
SW
77 char *inf, char *cst,
78 const unsigned char **in, long len,
79 int exptag, int expclass, char opt, ASN1_TLC *ctx);
56276539
SS
80
81static int asn1_template_ex_d2i(ASN1_VALUE **pval,
9eaaad39
SW
82 const unsigned char **in, long len,
83 const ASN1_TEMPLATE *tt, char opt,
84 ASN1_TLC *ctx);
56276539 85static int asn1_template_noexp_d2i(ASN1_VALUE **val,
9eaaad39
SW
86 const unsigned char **in, long len,
87 const ASN1_TEMPLATE *tt, char opt,
88 ASN1_TLC *ctx);
56276539 89static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
9eaaad39
SW
90 const unsigned char **in, long len,
91 const ASN1_ITEM *it,
92 int tag, int aclass, char opt,
93 ASN1_TLC *ctx);
56276539
SS
94
95/* Table to convert tags to bit values, used for MSTRING type */
e40c9513 96static const unsigned long tag2bit[32] = {
9eaaad39
SW
97 /* tags 0 - 3 */
98 0, 0, 0, B_ASN1_BIT_STRING,
99 /* tags 4- 7 */
100 B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN,
101 /* tags 8-11 */
102 B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,
103 /* tags 12-15 */
104 B_ASN1_UTF8STRING, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,
105 /* tags 16-19 */
106 B_ASN1_SEQUENCE, 0, B_ASN1_NUMERICSTRING, B_ASN1_PRINTABLESTRING,
107 /* tags 20-22 */
108 B_ASN1_T61STRING, B_ASN1_VIDEOTEXSTRING, B_ASN1_IA5STRING,
109 /* tags 23-24 */
110 B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME,
111 /* tags 25-27 */
112 B_ASN1_GRAPHICSTRING, B_ASN1_ISO64STRING, B_ASN1_GENERALSTRING,
113 /* tags 28-31 */
114 B_ASN1_UNIVERSALSTRING, B_ASN1_UNKNOWN, B_ASN1_BMPSTRING, B_ASN1_UNKNOWN,
115};
56276539
SS
116
117unsigned long ASN1_tag2bit(int tag)
9eaaad39
SW
118{
119 if ((tag < 0) || (tag > 30))
120 return 0;
121 return tag2bit[tag];
122}
56276539
SS
123
124/* Macro to initialize and invalidate the cache */
125
9eaaad39 126#define asn1_tlc_clear(c) if (c) (c)->valid = 0
919b01cc 127/* Version to avoid compiler warning about 'c' always non-NULL */
9eaaad39
SW
128#define asn1_tlc_clear_nc(c) (c)->valid = 0
129
130/*
131 * Decode an ASN1 item, this currently behaves just like a standard 'd2i'
132 * function. 'in' points to a buffer to read the data from, in future we
133 * will have more advanced versions that can input data a piece at a time and
134 * this will simply be a special case.
56276539
SS
135 */
136
137ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval,
9eaaad39
SW
138 const unsigned char **in, long len,
139 const ASN1_ITEM *it)
140{
141 ASN1_TLC c;
142 ASN1_VALUE *ptmpval = NULL;
143 if (!pval)
144 pval = &ptmpval;
145 asn1_tlc_clear_nc(&c);
146 if (ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0)
147 return *pval;
148 return NULL;
149}
56276539
SS
150
151int ASN1_template_d2i(ASN1_VALUE **pval,
9eaaad39
SW
152 const unsigned char **in, long len,
153 const ASN1_TEMPLATE *tt)
154{
155 ASN1_TLC c;
156 asn1_tlc_clear_nc(&c);
157 return asn1_template_ex_d2i(pval, in, len, tt, 0, &c);
158}
159
160/*
161 * Decode an item, taking care of IMPLICIT tagging, if any. If 'opt' set and
162 * tag mismatch return -1 to handle OPTIONAL
56276539
SS
163 */
164
165int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,
9eaaad39
SW
166 const ASN1_ITEM *it,
167 int tag, int aclass, char opt, ASN1_TLC *ctx)
168{
169 const ASN1_TEMPLATE *tt, *errtt = NULL;
170 const ASN1_COMPAT_FUNCS *cf;
171 const ASN1_EXTERN_FUNCS *ef;
172 const ASN1_AUX *aux = it->funcs;
173 ASN1_aux_cb *asn1_cb;
174 const unsigned char *p = NULL, *q;
175 unsigned char *wp = NULL; /* BIG FAT WARNING! BREAKS CONST WHERE USED */
176 unsigned char imphack = 0, oclass;
177 char seq_eoc, seq_nolen, cst, isopt;
178 long tmplen;
179 int i;
180 int otag;
181 int ret = 0;
182 ASN1_VALUE **pchptr, *ptmpval;
8be1fb4e
SW
183 int combine = aclass & ASN1_TFLG_COMBINE;
184 aclass &= ~ASN1_TFLG_COMBINE;
9eaaad39
SW
185 if (!pval)
186 return 0;
187 if (aux && aux->asn1_cb)
188 asn1_cb = aux->asn1_cb;
189 else
190 asn1_cb = 0;
191
192 switch (it->itype) {
193 case ASN1_ITYPE_PRIMITIVE:
194 if (it->templates) {
195 /*
196 * tagging or OPTIONAL is currently illegal on an item template
197 * because the flags can't get passed down. In practice this
198 * isn't a problem: we include the relevant flags from the item
199 * template in the template itself.
200 */
201 if ((tag != -1) || opt) {
202 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
203 ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
204 goto err;
205 }
206 return asn1_template_ex_d2i(pval, in, len,
207 it->templates, opt, ctx);
208 }
209 return asn1_d2i_ex_primitive(pval, in, len, it,
210 tag, aclass, opt, ctx);
211 break;
212
213 case ASN1_ITYPE_MSTRING:
214 p = *in;
215 /* Just read in tag and class */
216 ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL,
217 &p, len, -1, 0, 1, ctx);
218 if (!ret) {
219 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
220 goto err;
221 }
222
223 /* Must be UNIVERSAL class */
224 if (oclass != V_ASN1_UNIVERSAL) {
225 /* If OPTIONAL, assume this is OK */
226 if (opt)
227 return -1;
228 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MSTRING_NOT_UNIVERSAL);
229 goto err;
230 }
231 /* Check tag matches bit map */
232 if (!(ASN1_tag2bit(otag) & it->utype)) {
233 /* If OPTIONAL, assume this is OK */
234 if (opt)
235 return -1;
236 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MSTRING_WRONG_TAG);
237 goto err;
238 }
239 return asn1_d2i_ex_primitive(pval, in, len, it, otag, 0, 0, ctx);
240
241 case ASN1_ITYPE_EXTERN:
242 /* Use new style d2i */
243 ef = it->funcs;
244 return ef->asn1_ex_d2i(pval, in, len, it, tag, aclass, opt, ctx);
245
246 case ASN1_ITYPE_COMPAT:
247 /* we must resort to old style evil hackery */
248 cf = it->funcs;
249
250 /* If OPTIONAL see if it is there */
251 if (opt) {
252 int exptag;
253 p = *in;
254 if (tag == -1)
255 exptag = it->utype;
256 else
257 exptag = tag;
258 /*
259 * Don't care about anything other than presence of expected tag
260 */
261
262 ret = asn1_check_tlen(NULL, NULL, NULL, NULL, NULL,
263 &p, len, exptag, aclass, 1, ctx);
264 if (!ret) {
265 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
266 goto err;
267 }
268 if (ret == -1)
269 return -1;
270 }
271
272 /*
273 * This is the old style evil hack IMPLICIT handling: since the
274 * underlying code is expecting a tag and class other than the one
275 * present we change the buffer temporarily then change it back
276 * afterwards. This doesn't and never did work for tags > 30. Yes
277 * this is *horrible* but it is only needed for old style d2i which
278 * will hopefully not be around for much longer. FIXME: should copy
279 * the buffer then modify it so the input buffer can be const: we
280 * should *always* copy because the old style d2i might modify the
281 * buffer.
282 */
283
284 if (tag != -1) {
285 wp = *(unsigned char **)in;
286 imphack = *wp;
287 if (p == NULL) {
288 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
289 goto err;
290 }
291 *wp = (unsigned char)((*p & V_ASN1_CONSTRUCTED)
292 | it->utype);
293 }
294
295 ptmpval = cf->asn1_d2i(pval, in, len);
296
297 if (tag != -1)
298 *wp = imphack;
299
300 if (ptmpval)
301 return 1;
302
303 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
304 goto err;
305
306 case ASN1_ITYPE_CHOICE:
307 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
308 goto auxerr;
309 if (*pval) {
310 /* Free up and zero CHOICE value if initialised */
311 i = asn1_get_choice_selector(pval, it);
312 if ((i >= 0) && (i < it->tcount)) {
313 tt = it->templates + i;
314 pchptr = asn1_get_field_ptr(pval, tt);
315 ASN1_template_free(pchptr, tt);
316 asn1_set_choice_selector(pval, -1, it);
317 }
318 } else 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 /* CHOICE type, try each possibility in turn */
323 p = *in;
324 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
325 pchptr = asn1_get_field_ptr(pval, tt);
326 /*
327 * We mark field as OPTIONAL so its absence can be recognised.
328 */
329 ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);
330 /* If field not present, try the next one */
331 if (ret == -1)
332 continue;
333 /* If positive return, read OK, break loop */
334 if (ret > 0)
335 break;
336 /* Otherwise must be an ASN1 parsing error */
337 errtt = tt;
338 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
339 goto err;
340 }
341
342 /* Did we fall off the end without reading anything? */
343 if (i == it->tcount) {
344 /* If OPTIONAL, this is OK */
345 if (opt) {
346 /* Free and zero it */
347 ASN1_item_ex_free(pval, it);
348 return -1;
349 }
350 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_NO_MATCHING_CHOICE_TYPE);
351 goto err;
352 }
353
354 asn1_set_choice_selector(pval, i, it);
9eaaad39
SW
355 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
356 goto auxerr;
8be1fb4e 357 *in = p;
9eaaad39
SW
358 return 1;
359
360 case ASN1_ITYPE_NDEF_SEQUENCE:
361 case ASN1_ITYPE_SEQUENCE:
362 p = *in;
363 tmplen = len;
364
365 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
366 if (tag == -1) {
367 tag = V_ASN1_SEQUENCE;
368 aclass = V_ASN1_UNIVERSAL;
369 }
370 /* Get SEQUENCE length and update len, p */
371 ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst,
372 &p, len, tag, aclass, opt, ctx);
373 if (!ret) {
374 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
375 goto err;
376 } else if (ret == -1)
377 return -1;
378 if (aux && (aux->flags & ASN1_AFLG_BROKEN)) {
379 len = tmplen - (p - *in);
380 seq_nolen = 1;
381 }
382 /* If indefinite we don't do a length check */
383 else
384 seq_nolen = seq_eoc;
385 if (!cst) {
386 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
387 goto err;
388 }
389
390 if (!*pval && !ASN1_item_ex_new(pval, it)) {
391 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
392 goto err;
393 }
394
395 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
396 goto auxerr;
397
398 /* Free up and zero any ADB found */
399 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
400 if (tt->flags & ASN1_TFLG_ADB_MASK) {
401 const ASN1_TEMPLATE *seqtt;
402 ASN1_VALUE **pseqval;
403 seqtt = asn1_do_adb(pval, tt, 1);
404 pseqval = asn1_get_field_ptr(pval, seqtt);
405 ASN1_template_free(pseqval, seqtt);
406 }
407 }
408
409 /* Get each field entry */
410 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
411 const ASN1_TEMPLATE *seqtt;
412 ASN1_VALUE **pseqval;
413 seqtt = asn1_do_adb(pval, tt, 1);
414 if (!seqtt)
415 goto err;
416 pseqval = asn1_get_field_ptr(pval, seqtt);
417 /* Have we ran out of data? */
418 if (!len)
419 break;
420 q = p;
421 if (asn1_check_eoc(&p, len)) {
422 if (!seq_eoc) {
423 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_UNEXPECTED_EOC);
424 goto err;
425 }
426 len -= p - q;
427 seq_eoc = 0;
428 q = p;
429 break;
430 }
431 /*
432 * This determines the OPTIONAL flag value. The field cannot be
433 * omitted if it is the last of a SEQUENCE and there is still
434 * data to be read. This isn't strictly necessary but it
435 * increases efficiency in some cases.
436 */
437 if (i == (it->tcount - 1))
438 isopt = 0;
439 else
440 isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
441 /*
442 * attempt to read in field, allowing each to be OPTIONAL
443 */
444
445 ret = asn1_template_ex_d2i(pseqval, &p, len, seqtt, isopt, ctx);
446 if (!ret) {
447 errtt = seqtt;
448 goto err;
449 } else if (ret == -1) {
450 /*
451 * OPTIONAL component absent. Free and zero the field.
452 */
453 ASN1_template_free(pseqval, seqtt);
454 continue;
455 }
456 /* Update length */
457 len -= p - q;
458 }
459
460 /* Check for EOC if expecting one */
461 if (seq_eoc && !asn1_check_eoc(&p, len)) {
462 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC);
463 goto err;
464 }
465 /* Check all data read */
466 if (!seq_nolen && len) {
467 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_SEQUENCE_LENGTH_MISMATCH);
468 goto err;
469 }
470
471 /*
472 * If we get here we've got no more data in the SEQUENCE, however we
473 * may not have read all fields so check all remaining are OPTIONAL
474 * and clear any that are.
475 */
476 for (; i < it->tcount; tt++, i++) {
477 const ASN1_TEMPLATE *seqtt;
478 seqtt = asn1_do_adb(pval, tt, 1);
479 if (!seqtt)
480 goto err;
481 if (seqtt->flags & ASN1_TFLG_OPTIONAL) {
482 ASN1_VALUE **pseqval;
483 pseqval = asn1_get_field_ptr(pval, seqtt);
484 ASN1_template_free(pseqval, seqtt);
485 } else {
486 errtt = seqtt;
487 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_FIELD_MISSING);
488 goto err;
489 }
490 }
491 /* Save encoding */
492 if (!asn1_enc_save(pval, *in, p - *in, it))
493 goto auxerr;
9eaaad39
SW
494 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
495 goto auxerr;
8be1fb4e 496 *in = p;
9eaaad39
SW
497 return 1;
498
499 default:
500 return 0;
501 }
502 auxerr:
503 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR);
504 err:
8be1fb4e
SW
505 if (combine == 0)
506 ASN1_item_ex_free(pval, it);
9eaaad39
SW
507 if (errtt)
508 ERR_add_error_data(4, "Field=", errtt->field_name,
509 ", Type=", it->sname);
510 else
511 ERR_add_error_data(2, "Type=", it->sname);
512 return 0;
513}
514
515/*
516 * Templates are handled with two separate functions. One handles any
517 * EXPLICIT tag and the other handles the rest.
56276539
SS
518 */
519
520static int asn1_template_ex_d2i(ASN1_VALUE **val,
9eaaad39
SW
521 const unsigned char **in, long inlen,
522 const ASN1_TEMPLATE *tt, char opt,
523 ASN1_TLC *ctx)
524{
525 int flags, aclass;
526 int ret;
527 long len;
528 const unsigned char *p, *q;
529 char exp_eoc;
530 if (!val)
531 return 0;
532 flags = tt->flags;
533 aclass = flags & ASN1_TFLG_TAG_CLASS;
534
535 p = *in;
536
537 /* Check if EXPLICIT tag expected */
538 if (flags & ASN1_TFLG_EXPTAG) {
539 char cst;
540 /*
541 * Need to work out amount of data available to the inner content and
542 * where it starts: so read in EXPLICIT header to get the info.
543 */
544 ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst,
545 &p, inlen, tt->tag, aclass, opt, ctx);
546 q = p;
547 if (!ret) {
548 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
549 return 0;
550 } else if (ret == -1)
551 return -1;
552 if (!cst) {
553 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
554 ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
555 return 0;
556 }
557 /* We've found the field so it can't be OPTIONAL now */
558 ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);
559 if (!ret) {
560 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
561 return 0;
562 }
563 /* We read the field in OK so update length */
564 len -= p - q;
565 if (exp_eoc) {
566 /* If NDEF we must have an EOC here */
567 if (!asn1_check_eoc(&p, len)) {
568 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ASN1_R_MISSING_EOC);
569 goto err;
570 }
571 } else {
572 /*
573 * Otherwise we must hit the EXPLICIT tag end or its an error
574 */
575 if (len) {
576 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
577 ASN1_R_EXPLICIT_LENGTH_MISMATCH);
578 goto err;
579 }
580 }
581 } else
582 return asn1_template_noexp_d2i(val, in, inlen, tt, opt, ctx);
583
584 *in = p;
585 return 1;
586
587 err:
588 ASN1_template_free(val, tt);
589 return 0;
590}
56276539
SS
591
592static int asn1_template_noexp_d2i(ASN1_VALUE **val,
9eaaad39
SW
593 const unsigned char **in, long len,
594 const ASN1_TEMPLATE *tt, char opt,
595 ASN1_TLC *ctx)
596{
597 int flags, aclass;
598 int ret;
599 const unsigned char *p, *q;
600 if (!val)
601 return 0;
602 flags = tt->flags;
603 aclass = flags & ASN1_TFLG_TAG_CLASS;
604
605 p = *in;
606 q = p;
607
608 if (flags & ASN1_TFLG_SK_MASK) {
609 /* SET OF, SEQUENCE OF */
610 int sktag, skaclass;
611 char sk_eoc;
612 /* First work out expected inner tag value */
613 if (flags & ASN1_TFLG_IMPTAG) {
614 sktag = tt->tag;
615 skaclass = aclass;
616 } else {
617 skaclass = V_ASN1_UNIVERSAL;
618 if (flags & ASN1_TFLG_SET_OF)
619 sktag = V_ASN1_SET;
620 else
621 sktag = V_ASN1_SEQUENCE;
622 }
623 /* Get the tag */
624 ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL,
625 &p, len, sktag, skaclass, opt, ctx);
626 if (!ret) {
627 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR);
628 return 0;
629 } else if (ret == -1)
630 return -1;
631 if (!*val)
632 *val = (ASN1_VALUE *)sk_new_null();
633 else {
634 /*
635 * We've got a valid STACK: free up any items present
636 */
637 STACK_OF(ASN1_VALUE) *sktmp = (STACK_OF(ASN1_VALUE) *)*val;
638 ASN1_VALUE *vtmp;
639 while (sk_ASN1_VALUE_num(sktmp) > 0) {
640 vtmp = sk_ASN1_VALUE_pop(sktmp);
641 ASN1_item_ex_free(&vtmp, ASN1_ITEM_ptr(tt->item));
642 }
643 }
644
645 if (!*val) {
646 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_MALLOC_FAILURE);
647 goto err;
648 }
649
650 /* Read as many items as we can */
651 while (len > 0) {
652 ASN1_VALUE *skfield;
653 q = p;
654 /* See if EOC found */
655 if (asn1_check_eoc(&p, len)) {
656 if (!sk_eoc) {
657 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
658 ASN1_R_UNEXPECTED_EOC);
659 goto err;
660 }
661 len -= p - q;
662 sk_eoc = 0;
663 break;
664 }
665 skfield = NULL;
666 if (!ASN1_item_ex_d2i(&skfield, &p, len,
667 ASN1_ITEM_ptr(tt->item), -1, 0, 0, ctx)) {
668 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
669 ERR_R_NESTED_ASN1_ERROR);
670 goto err;
671 }
672 len -= p - q;
673 if (!sk_ASN1_VALUE_push((STACK_OF(ASN1_VALUE) *)*val, skfield)) {
674 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_MALLOC_FAILURE);
675 goto err;
676 }
677 }
678 if (sk_eoc) {
679 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ASN1_R_MISSING_EOC);
680 goto err;
681 }
682 } else if (flags & ASN1_TFLG_IMPTAG) {
683 /* IMPLICIT tagging */
684 ret = ASN1_item_ex_d2i(val, &p, len,
685 ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt,
686 ctx);
687 if (!ret) {
688 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR);
689 goto err;
690 } else if (ret == -1)
691 return -1;
692 } else {
693 /* Nothing special */
694 ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item),
8be1fb4e 695 -1, tt->flags & ASN1_TFLG_COMBINE, opt, ctx);
9eaaad39
SW
696 if (!ret) {
697 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR);
698 goto err;
699 } else if (ret == -1)
700 return -1;
701 }
702
703 *in = p;
704 return 1;
705
706 err:
707 ASN1_template_free(val, tt);
708 return 0;
709}
56276539
SS
710
711static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
9eaaad39
SW
712 const unsigned char **in, long inlen,
713 const ASN1_ITEM *it,
714 int tag, int aclass, char opt, ASN1_TLC *ctx)
715{
716 int ret = 0, utype;
717 long plen;
718 char cst, inf, free_cont = 0;
719 const unsigned char *p;
720 BUF_MEM buf;
721 const unsigned char *cont = NULL;
722 long len;
723 if (!pval) {
724 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL);
725 return 0; /* Should never happen */
726 }
727
728 if (it->itype == ASN1_ITYPE_MSTRING) {
729 utype = tag;
730 tag = -1;
731 } else
732 utype = it->utype;
733
734 if (utype == V_ASN1_ANY) {
735 /* If type is ANY need to figure out type from tag */
736 unsigned char oclass;
737 if (tag >= 0) {
738 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_TAGGED_ANY);
739 return 0;
740 }
741 if (opt) {
742 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
743 ASN1_R_ILLEGAL_OPTIONAL_ANY);
744 return 0;
745 }
746 p = *in;
747 ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL,
748 &p, inlen, -1, 0, 0, ctx);
749 if (!ret) {
750 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
751 return 0;
752 }
753 if (oclass != V_ASN1_UNIVERSAL)
754 utype = V_ASN1_OTHER;
755 }
756 if (tag == -1) {
757 tag = utype;
758 aclass = V_ASN1_UNIVERSAL;
759 }
760 p = *in;
761 /* Check header */
762 ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst,
763 &p, inlen, tag, aclass, opt, ctx);
764 if (!ret) {
765 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
766 return 0;
767 } else if (ret == -1)
768 return -1;
769 ret = 0;
770 /* SEQUENCE, SET and "OTHER" are left in encoded form */
771 if ((utype == V_ASN1_SEQUENCE)
772 || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER)) {
773 /*
774 * Clear context cache for type OTHER because the auto clear when we
775 * have a exact match wont work
776 */
777 if (utype == V_ASN1_OTHER) {
778 asn1_tlc_clear(ctx);
779 }
780 /* SEQUENCE and SET must be constructed */
781 else if (!cst) {
782 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
783 ASN1_R_TYPE_NOT_CONSTRUCTED);
784 return 0;
785 }
786
787 cont = *in;
788 /* If indefinite length constructed find the real end */
789 if (inf) {
790 if (!asn1_find_end(&p, plen, inf))
791 goto err;
792 len = p - cont;
793 } else {
794 len = p - cont + plen;
795 p += plen;
796 buf.data = NULL;
797 }
798 } else if (cst) {
799 if (utype == V_ASN1_NULL || utype == V_ASN1_BOOLEAN
800 || utype == V_ASN1_OBJECT || utype == V_ASN1_INTEGER
801 || utype == V_ASN1_ENUMERATED) {
802 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_TYPE_NOT_PRIMITIVE);
803 return 0;
804 }
805 buf.length = 0;
806 buf.max = 0;
807 buf.data = NULL;
808 /*
809 * Should really check the internal tags are correct but some things
810 * may get this wrong. The relevant specs say that constructed string
811 * types should be OCTET STRINGs internally irrespective of the type.
812 * So instead just check for UNIVERSAL class and ignore the tag.
813 */
814 if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL, 0)) {
815 free_cont = 1;
816 goto err;
817 }
818 len = buf.length;
819 /* Append a final null to string */
820 if (!BUF_MEM_grow_clean(&buf, len + 1)) {
821 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
822 return 0;
823 }
824 buf.data[len] = 0;
825 cont = (const unsigned char *)buf.data;
826 free_cont = 1;
827 } else {
828 cont = p;
829 len = plen;
830 p += plen;
831 }
832
833 /* We now have content length and type: translate into a structure */
834 if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it))
835 goto err;
836
837 *in = p;
838 ret = 1;
839 err:
840 if (free_cont && buf.data)
841 OPENSSL_free(buf.data);
842 return ret;
843}
56276539
SS
844
845/* Translate ASN1 content octets into a structure */
846
847int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
9eaaad39
SW
848 int utype, char *free_cont, const ASN1_ITEM *it)
849{
850 ASN1_VALUE **opval = NULL;
851 ASN1_STRING *stmp;
852 ASN1_TYPE *typ = NULL;
853 int ret = 0;
854 const ASN1_PRIMITIVE_FUNCS *pf;
855 ASN1_INTEGER **tint;
856 pf = it->funcs;
857
858 if (pf && pf->prim_c2i)
859 return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
860 /* If ANY type clear type and set pointer to internal value */
861 if (it->utype == V_ASN1_ANY) {
862 if (!*pval) {
863 typ = ASN1_TYPE_new();
864 if (typ == NULL)
865 goto err;
866 *pval = (ASN1_VALUE *)typ;
867 } else
868 typ = (ASN1_TYPE *)*pval;
869
870 if (utype != typ->type)
871 ASN1_TYPE_set(typ, utype, NULL);
872 opval = pval;
873 pval = &typ->value.asn1_value;
874 }
875 switch (utype) {
876 case V_ASN1_OBJECT:
877 if (!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len))
878 goto err;
879 break;
880
881 case V_ASN1_NULL:
882 if (len) {
883 ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_NULL_IS_WRONG_LENGTH);
884 goto err;
885 }
886 *pval = (ASN1_VALUE *)1;
887 break;
888
889 case V_ASN1_BOOLEAN:
890 if (len != 1) {
891 ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
892 goto err;
893 } else {
894 ASN1_BOOLEAN *tbool;
895 tbool = (ASN1_BOOLEAN *)pval;
896 *tbool = *cont;
897 }
898 break;
899
900 case V_ASN1_BIT_STRING:
901 if (!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len))
902 goto err;
903 break;
904
905 case V_ASN1_INTEGER:
906 case V_ASN1_NEG_INTEGER:
907 case V_ASN1_ENUMERATED:
908 case V_ASN1_NEG_ENUMERATED:
909 tint = (ASN1_INTEGER **)pval;
910 if (!c2i_ASN1_INTEGER(tint, &cont, len))
911 goto err;
912 /* Fixup type to match the expected form */
913 (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
914 break;
915
916 case V_ASN1_OCTET_STRING:
917 case V_ASN1_NUMERICSTRING:
918 case V_ASN1_PRINTABLESTRING:
919 case V_ASN1_T61STRING:
920 case V_ASN1_VIDEOTEXSTRING:
921 case V_ASN1_IA5STRING:
922 case V_ASN1_UTCTIME:
923 case V_ASN1_GENERALIZEDTIME:
924 case V_ASN1_GRAPHICSTRING:
925 case V_ASN1_VISIBLESTRING:
926 case V_ASN1_GENERALSTRING:
927 case V_ASN1_UNIVERSALSTRING:
928 case V_ASN1_BMPSTRING:
929 case V_ASN1_UTF8STRING:
930 case V_ASN1_OTHER:
931 case V_ASN1_SET:
932 case V_ASN1_SEQUENCE:
933 default:
934 if (utype == V_ASN1_BMPSTRING && (len & 1)) {
935 ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_BMPSTRING_IS_WRONG_LENGTH);
936 goto err;
937 }
938 if (utype == V_ASN1_UNIVERSALSTRING && (len & 3)) {
939 ASN1err(ASN1_F_ASN1_EX_C2I,
940 ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH);
941 goto err;
942 }
943 /* All based on ASN1_STRING and handled the same */
944 if (!*pval) {
945 stmp = ASN1_STRING_type_new(utype);
946 if (!stmp) {
947 ASN1err(ASN1_F_ASN1_EX_C2I, ERR_R_MALLOC_FAILURE);
948 goto err;
949 }
950 *pval = (ASN1_VALUE *)stmp;
951 } else {
952 stmp = (ASN1_STRING *)*pval;
953 stmp->type = utype;
954 }
955 /* If we've already allocated a buffer use it */
956 if (*free_cont) {
957 if (stmp->data)
958 OPENSSL_free(stmp->data);
959 stmp->data = (unsigned char *)cont; /* UGLY CAST! RL */
960 stmp->length = len;
961 *free_cont = 0;
962 } else {
963 if (!ASN1_STRING_set(stmp, cont, len)) {
964 ASN1err(ASN1_F_ASN1_EX_C2I, ERR_R_MALLOC_FAILURE);
965 ASN1_STRING_free(stmp);
966 *pval = NULL;
967 goto err;
968 }
969 }
970 break;
971 }
972 /* If ASN1_ANY and NULL type fix up value */
973 if (typ && (utype == V_ASN1_NULL))
974 typ->value.ptr = NULL;
975
976 ret = 1;
977 err:
978 if (!ret) {
979 ASN1_TYPE_free(typ);
980 if (opval)
981 *opval = NULL;
982 }
983 return ret;
984}
985
986/*
987 * This function finds the end of an ASN1 structure when passed its maximum
988 * length, whether it is indefinite length and a pointer to the content. This
989 * is more efficient than calling asn1_collect because it does not recurse on
990 * each indefinite length header.
56276539
SS
991 */
992
993static int asn1_find_end(const unsigned char **in, long len, char inf)
9eaaad39
SW
994{
995 int expected_eoc;
996 long plen;
997 const unsigned char *p = *in, *q;
998 /* If not indefinite length constructed just add length */
999 if (inf == 0) {
1000 *in += len;
1001 return 1;
1002 }
1003 expected_eoc = 1;
1004 /*
1005 * Indefinite length constructed form. Find the end when enough EOCs are
1006 * found. If more indefinite length constructed headers are encountered
1007 * increment the expected eoc count otherwise just skip to the end of the
1008 * data.
1009 */
1010 while (len > 0) {
1011 if (asn1_check_eoc(&p, len)) {
1012 expected_eoc--;
1013 if (expected_eoc == 0)
1014 break;
1015 len -= 2;
1016 continue;
1017 }
1018 q = p;
1019 /* Just read in a header: only care about the length */
1020 if (!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len,
1021 -1, 0, 0, NULL)) {
1022 ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR);
1023 return 0;
1024 }
1025 if (inf)
1026 expected_eoc++;
1027 else
1028 p += plen;
1029 len -= p - q;
1030 }
1031 if (expected_eoc) {
1032 ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC);
1033 return 0;
1034 }
1035 *in = p;
1036 return 1;
1037}
1038
1039/*
1040 * This function collects the asn1 data from a constructred string type into
1041 * a buffer. The values of 'in' and 'len' should refer to the contents of the
1042 * constructed type and 'inf' should be set if it is indefinite length.
56276539
SS
1043 */
1044
75607dda 1045#ifndef ASN1_MAX_STRING_NEST
9eaaad39
SW
1046/*
1047 * This determines how many levels of recursion are permitted in ASN1 string
1048 * types. If it is not limited stack overflows can occur. If set to zero no
1049 * recursion is allowed at all. Although zero should be adequate examples
1050 * exist that require a value of 1. So 5 should be more than enough.
75607dda 1051 */
9eaaad39 1052# define ASN1_MAX_STRING_NEST 5
75607dda
PA
1053#endif
1054
56276539 1055static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
9eaaad39
SW
1056 char inf, int tag, int aclass, int depth)
1057{
1058 const unsigned char *p, *q;
1059 long plen;
1060 char cst, ininf;
1061 p = *in;
1062 inf &= 1;
1063 /*
1064 * If no buffer and not indefinite length constructed just pass over the
1065 * encoded data
1066 */
1067 if (!buf && !inf) {
1068 *in += len;
1069 return 1;
1070 }
1071 while (len > 0) {
1072 q = p;
1073 /* Check for EOC */
1074 if (asn1_check_eoc(&p, len)) {
1075 /*
1076 * EOC is illegal outside indefinite length constructed form
1077 */
1078 if (!inf) {
1079 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_UNEXPECTED_EOC);
1080 return 0;
1081 }
1082 inf = 0;
1083 break;
1084 }
1085
1086 if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p,
1087 len, tag, aclass, 0, NULL)) {
1088 ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
1089 return 0;
1090 }
1091
1092 /* If indefinite length constructed update max length */
1093 if (cst) {
1094 if (depth >= ASN1_MAX_STRING_NEST) {
1095 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_NESTED_ASN1_STRING);
1096 return 0;
1097 }
1098 if (!asn1_collect(buf, &p, plen, ininf, tag, aclass, depth + 1))
1099 return 0;
1100 } else if (plen && !collect_data(buf, &p, plen))
1101 return 0;
1102 len -= p - q;
1103 }
1104 if (inf) {
1105 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
1106 return 0;
1107 }
1108 *in = p;
1109 return 1;
1110}
56276539
SS
1111
1112static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen)
9eaaad39
SW
1113{
1114 int len;
1115 if (buf) {
1116 len = buf->length;
1117 if (!BUF_MEM_grow_clean(buf, len + plen)) {
1118 ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE);
1119 return 0;
1120 }
1121 memcpy(buf->data + len, *p, plen);
1122 }
1123 *p += plen;
1124 return 1;
1125}
56276539
SS
1126
1127/* Check for ASN1 EOC and swallow it if found */
1128
1129static int asn1_check_eoc(const unsigned char **in, long len)
9eaaad39
SW
1130{
1131 const unsigned char *p;
1132 if (len < 2)
1133 return 0;
1134 p = *in;
1135 if (!p[0] && !p[1]) {
1136 *in += 2;
1137 return 1;
1138 }
1139 return 0;
1140}
1141
1142/*
1143 * Check an ASN1 tag and length: a bit like ASN1_get_object but it sets the
1144 * length for indefinite length constructed form, we don't know the exact
1145 * length but we can set an upper bound to the amount of data available minus
1146 * the header length just read.
56276539
SS
1147 */
1148
1149static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
9eaaad39
SW
1150 char *inf, char *cst,
1151 const unsigned char **in, long len,
1152 int exptag, int expclass, char opt, ASN1_TLC *ctx)
1153{
1154 int i;
1155 int ptag, pclass;
1156 long plen;
1157 const unsigned char *p, *q;
1158 p = *in;
1159 q = p;
1160
1161 if (ctx && ctx->valid) {
1162 i = ctx->ret;
1163 plen = ctx->plen;
1164 pclass = ctx->pclass;
1165 ptag = ctx->ptag;
1166 p += ctx->hdrlen;
1167 } else {
1168 i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);
1169 if (ctx) {
1170 ctx->ret = i;
1171 ctx->plen = plen;
1172 ctx->pclass = pclass;
1173 ctx->ptag = ptag;
1174 ctx->hdrlen = p - q;
1175 ctx->valid = 1;
1176 /*
1177 * If definite length, and no error, length + header can't exceed
1178 * total amount of data available.
1179 */
1180 if (!(i & 0x81) && ((plen + ctx->hdrlen) > len)) {
1181 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_TOO_LONG);
1182 asn1_tlc_clear(ctx);
1183 return 0;
1184 }
1185 }
1186 }
1187
1188 if (i & 0x80) {
1189 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER);
1190 asn1_tlc_clear(ctx);
1191 return 0;
1192 }
1193 if (exptag >= 0) {
1194 if ((exptag != ptag) || (expclass != pclass)) {
1195 /*
1196 * If type is OPTIONAL, not an error: indicate missing type.
1197 */
1198 if (opt)
1199 return -1;
1200 asn1_tlc_clear(ctx);
1201 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG);
1202 return 0;
1203 }
1204 /*
1205 * We have a tag and class match: assume we are going to do something
1206 * with it
1207 */
1208 asn1_tlc_clear(ctx);
1209 }
1210
1211 if (i & 1)
1212 plen = len - (p - q);
1213
1214 if (inf)
1215 *inf = i & 1;
1216
1217 if (cst)
1218 *cst = i & V_ASN1_CONSTRUCTED;
1219
1220 if (olen)
1221 *olen = plen;
1222
1223 if (oclass)
1224 *oclass = pclass;
1225
1226 if (otag)
1227 *otag = ptag;
1228
1229 *in = p;
1230 return 1;
1231}