2 * Copyright 2000-2024 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
12 #include <openssl/asn1.h>
13 #include <openssl/asn1t.h>
14 #include <openssl/objects.h>
15 #include <openssl/buffer.h>
16 #include <openssl/err.h>
17 #include "internal/numbers.h"
18 #include "asn1_local.h"
21 * Constructed types with a recursive definition (such as can be found in PKCS7)
22 * could eventually exceed the stack given malicious input with excessive
23 * recursion. Therefore we limit the stack depth. This is the maximum number of
24 * recursive invocations of asn1_item_embed_d2i().
26 #define ASN1_MAX_CONSTRUCTED_NEST 30
28 static int asn1_item_embed_d2i(ASN1_VALUE **pval, const unsigned char **in,
29 long len, const ASN1_ITEM *it,
30 int tag, int aclass, char opt, ASN1_TLC *ctx,
31 int depth, OSSL_LIB_CTX *libctx,
34 static int asn1_check_eoc(const unsigned char **in, long len);
35 static int asn1_find_end(const unsigned char **in, long len, char inf);
37 static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
38 char inf, int tag, int aclass, int depth);
40 static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen);
42 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
44 const unsigned char **in, long len,
45 int exptag, int expclass, char opt, ASN1_TLC *ctx);
47 static int asn1_template_ex_d2i(ASN1_VALUE **pval,
48 const unsigned char **in, long len,
49 const ASN1_TEMPLATE *tt, char opt,
50 ASN1_TLC *ctx, int depth, OSSL_LIB_CTX *libctx,
52 static int asn1_template_noexp_d2i(ASN1_VALUE **val,
53 const unsigned char **in, long len,
54 const ASN1_TEMPLATE *tt, char opt,
55 ASN1_TLC *ctx, int depth,
56 OSSL_LIB_CTX *libctx, const char *propq);
57 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
58 const unsigned char **in, long len,
60 int tag, int aclass, char opt,
62 static int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
63 int utype, char *free_cont, const ASN1_ITEM *it);
65 /* Table to convert tags to bit values, used for MSTRING type */
66 static const unsigned long tag2bit[32] = {
68 0, 0, 0, B_ASN1_BIT_STRING,
70 B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN,
72 B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, 0, B_ASN1_UNKNOWN,
74 B_ASN1_UTF8STRING, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,
76 B_ASN1_SEQUENCE, 0, B_ASN1_NUMERICSTRING, B_ASN1_PRINTABLESTRING,
78 B_ASN1_T61STRING, B_ASN1_VIDEOTEXSTRING, B_ASN1_IA5STRING,
80 B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME,
82 B_ASN1_GRAPHICSTRING, B_ASN1_ISO64STRING, B_ASN1_GENERALSTRING,
84 B_ASN1_UNIVERSALSTRING, B_ASN1_UNKNOWN, B_ASN1_BMPSTRING, B_ASN1_UNKNOWN,
87 unsigned long ASN1_tag2bit(int tag)
89 if ((tag < 0) || (tag > 30))
94 /* Macro to initialize and invalidate the cache */
96 #define asn1_tlc_clear(c) do { if ((c) != NULL) (c)->valid = 0; } while (0)
97 /* Version to avoid compiler warning about 'c' always non-NULL */
98 #define asn1_tlc_clear_nc(c) do {(c)->valid = 0; } while (0)
101 * Decode an ASN1 item, this currently behaves just like a standard 'd2i'
102 * function. 'in' points to a buffer to read the data from, in future we
103 * will have more advanced versions that can input data a piece at a time and
104 * this will simply be a special case.
107 static int asn1_item_ex_d2i_intern(ASN1_VALUE **pval, const unsigned char **in,
108 long len, const ASN1_ITEM *it, int tag,
109 int aclass, char opt, ASN1_TLC *ctx,
110 OSSL_LIB_CTX *libctx, const char *propq)
114 if (pval == NULL || it == NULL) {
115 ERR_raise(ERR_LIB_ASN1, ERR_R_PASSED_NULL_PARAMETER);
118 rv = asn1_item_embed_d2i(pval, in, len, it, tag, aclass, opt, ctx, 0,
121 ASN1_item_ex_free(pval, it);
125 int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,
127 int tag, int aclass, char opt, ASN1_TLC *ctx)
129 return asn1_item_ex_d2i_intern(pval, in, len, it, tag, aclass, opt, ctx,
133 ASN1_VALUE *ASN1_item_d2i_ex(ASN1_VALUE **pval,
134 const unsigned char **in, long len,
135 const ASN1_ITEM *it, OSSL_LIB_CTX *libctx,
139 ASN1_VALUE *ptmpval = NULL;
143 asn1_tlc_clear_nc(&c);
144 if (asn1_item_ex_d2i_intern(pval, in, len, it, -1, 0, 0, &c, libctx,
150 ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval,
151 const unsigned char **in, long len,
154 return ASN1_item_d2i_ex(pval, in, len, it, NULL, NULL);
158 * Decode an item, taking care of IMPLICIT tagging, if any. If 'opt' set and
159 * tag mismatch return -1 to handle OPTIONAL
162 static int asn1_item_embed_d2i(ASN1_VALUE **pval, const unsigned char **in,
163 long len, const ASN1_ITEM *it,
164 int tag, int aclass, char opt, ASN1_TLC *ctx,
165 int depth, OSSL_LIB_CTX *libctx,
168 const ASN1_TEMPLATE *tt, *errtt = NULL;
169 const ASN1_EXTERN_FUNCS *ef;
171 ASN1_aux_cb *asn1_cb;
172 const unsigned char *p = NULL, *q;
173 unsigned char oclass;
174 char seq_eoc, seq_nolen, cst, isopt;
181 if (pval == NULL || it == NULL) {
182 ERR_raise(ERR_LIB_ASN1, ERR_R_PASSED_NULL_PARAMETER);
186 ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_SMALL);
190 if (aux && aux->asn1_cb)
191 asn1_cb = aux->asn1_cb;
195 if (++depth > ASN1_MAX_CONSTRUCTED_NEST) {
196 ERR_raise(ERR_LIB_ASN1, ASN1_R_NESTED_TOO_DEEP);
201 case ASN1_ITYPE_PRIMITIVE:
204 * tagging or OPTIONAL is currently illegal on an item template
205 * because the flags can't get passed down. In practice this
206 * isn't a problem: we include the relevant flags from the item
207 * template in the template itself.
209 if ((tag != -1) || opt) {
210 ERR_raise(ERR_LIB_ASN1,
211 ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
214 return asn1_template_ex_d2i(pval, in, len, it->templates, opt, ctx,
215 depth, libctx, propq);
217 return asn1_d2i_ex_primitive(pval, in, len, it,
218 tag, aclass, opt, ctx);
220 case ASN1_ITYPE_MSTRING:
222 * It never makes sense for multi-strings to have implicit tagging, so
223 * if tag != -1, then this looks like an error in the template.
226 ERR_raise(ERR_LIB_ASN1, ASN1_R_BAD_TEMPLATE);
231 /* Just read in tag and class */
232 ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL,
233 &p, len, -1, 0, 1, ctx);
235 ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
239 /* Must be UNIVERSAL class */
240 if (oclass != V_ASN1_UNIVERSAL) {
241 /* If OPTIONAL, assume this is OK */
244 ERR_raise(ERR_LIB_ASN1, ASN1_R_MSTRING_NOT_UNIVERSAL);
248 /* Check tag matches bit map */
249 if (!(ASN1_tag2bit(otag) & it->utype)) {
250 /* If OPTIONAL, assume this is OK */
253 ERR_raise(ERR_LIB_ASN1, ASN1_R_MSTRING_WRONG_TAG);
256 return asn1_d2i_ex_primitive(pval, in, len, it, otag, 0, 0, ctx);
258 case ASN1_ITYPE_EXTERN:
259 /* Use new style d2i */
261 if (ef->asn1_ex_d2i_ex != NULL)
262 return ef->asn1_ex_d2i_ex(pval, in, len, it, tag, aclass, opt, ctx,
264 return ef->asn1_ex_d2i(pval, in, len, it, tag, aclass, opt, ctx);
266 case ASN1_ITYPE_CHOICE:
268 * It never makes sense for CHOICE types to have implicit tagging, so
269 * if tag != -1, then this looks like an error in the template.
272 ERR_raise(ERR_LIB_ASN1, ASN1_R_BAD_TEMPLATE);
276 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
279 /* Free up and zero CHOICE value if initialised */
280 i = ossl_asn1_get_choice_selector(pval, it);
281 if ((i >= 0) && (i < it->tcount)) {
282 tt = it->templates + i;
283 pchptr = ossl_asn1_get_field_ptr(pval, tt);
284 ossl_asn1_template_free(pchptr, tt);
285 ossl_asn1_set_choice_selector(pval, -1, it);
287 } else if (!ossl_asn1_item_ex_new_intern(pval, it, libctx, propq)) {
288 ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
291 /* CHOICE type, try each possibility in turn */
293 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
294 pchptr = ossl_asn1_get_field_ptr(pval, tt);
296 * We mark field as OPTIONAL so its absence can be recognised.
298 ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx, depth,
300 /* If field not present, try the next one */
303 /* If positive return, read OK, break loop */
307 * Must be an ASN1 parsing error.
308 * Free up any partial choice value
310 ossl_asn1_template_free(pchptr, tt);
312 ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
316 /* Did we fall off the end without reading anything? */
317 if (i == it->tcount) {
318 /* If OPTIONAL, this is OK */
320 /* Free and zero it */
321 ASN1_item_ex_free(pval, it);
324 ERR_raise(ERR_LIB_ASN1, ASN1_R_NO_MATCHING_CHOICE_TYPE);
328 ossl_asn1_set_choice_selector(pval, i, it);
330 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
335 case ASN1_ITYPE_NDEF_SEQUENCE:
336 case ASN1_ITYPE_SEQUENCE:
340 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
342 tag = V_ASN1_SEQUENCE;
343 aclass = V_ASN1_UNIVERSAL;
345 /* Get SEQUENCE length and update len, p */
346 ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst,
347 &p, len, tag, aclass, opt, ctx);
349 ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
351 } else if (ret == -1)
353 if (aux && (aux->flags & ASN1_AFLG_BROKEN)) {
354 len = tmplen - (p - *in);
357 /* If indefinite we don't do a length check */
361 ERR_raise(ERR_LIB_ASN1, ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
366 && !ossl_asn1_item_ex_new_intern(pval, it, libctx, propq)) {
367 ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
371 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
374 /* Free up and zero any ADB found */
375 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
376 if (tt->flags & ASN1_TFLG_ADB_MASK) {
377 const ASN1_TEMPLATE *seqtt;
378 ASN1_VALUE **pseqval;
379 seqtt = ossl_asn1_do_adb(*pval, tt, 0);
382 pseqval = ossl_asn1_get_field_ptr(pval, seqtt);
383 ossl_asn1_template_free(pseqval, seqtt);
387 /* Get each field entry */
388 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
389 const ASN1_TEMPLATE *seqtt;
390 ASN1_VALUE **pseqval;
391 seqtt = ossl_asn1_do_adb(*pval, tt, 1);
394 pseqval = ossl_asn1_get_field_ptr(pval, seqtt);
395 /* Have we ran out of data? */
399 if (asn1_check_eoc(&p, len)) {
401 ERR_raise(ERR_LIB_ASN1, ASN1_R_UNEXPECTED_EOC);
409 * This determines the OPTIONAL flag value. The field cannot be
410 * omitted if it is the last of a SEQUENCE and there is still
411 * data to be read. This isn't strictly necessary but it
412 * increases efficiency in some cases.
414 if (i == (it->tcount - 1))
417 isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
419 * attempt to read in field, allowing each to be OPTIONAL
422 ret = asn1_template_ex_d2i(pseqval, &p, len, seqtt, isopt, ctx,
423 depth, libctx, propq);
427 } else if (ret == -1) {
429 * OPTIONAL component absent. Free and zero the field.
431 ossl_asn1_template_free(pseqval, seqtt);
438 /* Check for EOC if expecting one */
439 if (seq_eoc && !asn1_check_eoc(&p, len)) {
440 ERR_raise(ERR_LIB_ASN1, ASN1_R_MISSING_EOC);
443 /* Check all data read */
444 if (!seq_nolen && len) {
445 ERR_raise(ERR_LIB_ASN1, ASN1_R_SEQUENCE_LENGTH_MISMATCH);
450 * If we get here we've got no more data in the SEQUENCE, however we
451 * may not have read all fields so check all remaining are OPTIONAL
452 * and clear any that are.
454 for (; i < it->tcount; tt++, i++) {
455 const ASN1_TEMPLATE *seqtt;
456 seqtt = ossl_asn1_do_adb(*pval, tt, 1);
459 if (seqtt->flags & ASN1_TFLG_OPTIONAL) {
460 ASN1_VALUE **pseqval;
461 pseqval = ossl_asn1_get_field_ptr(pval, seqtt);
462 ossl_asn1_template_free(pseqval, seqtt);
465 ERR_raise(ERR_LIB_ASN1, ASN1_R_FIELD_MISSING);
470 if (!ossl_asn1_enc_save(pval, *in, p - *in, it))
472 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
481 ERR_raise(ERR_LIB_ASN1, ASN1_R_AUX_ERROR);
484 ERR_add_error_data(4, "Field=", errtt->field_name,
485 ", Type=", it->sname);
487 ERR_add_error_data(2, "Type=", it->sname);
492 * Templates are handled with two separate functions. One handles any
493 * EXPLICIT tag and the other handles the rest.
496 static int asn1_template_ex_d2i(ASN1_VALUE **val,
497 const unsigned char **in, long inlen,
498 const ASN1_TEMPLATE *tt, char opt,
499 ASN1_TLC *ctx, int depth,
500 OSSL_LIB_CTX *libctx, const char *propq)
505 const unsigned char *p, *q;
510 aclass = flags & ASN1_TFLG_TAG_CLASS;
514 /* Check if EXPLICIT tag expected */
515 if (flags & ASN1_TFLG_EXPTAG) {
518 * Need to work out amount of data available to the inner content and
519 * where it starts: so read in EXPLICIT header to get the info.
521 ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst,
522 &p, inlen, tt->tag, aclass, opt, ctx);
525 ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
527 } else if (ret == -1)
530 ERR_raise(ERR_LIB_ASN1, ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
533 /* We've found the field so it can't be OPTIONAL now */
534 ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx, depth, libctx,
537 ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
540 /* We read the field in OK so update length */
543 /* If NDEF we must have an EOC here */
544 if (!asn1_check_eoc(&p, len)) {
545 ERR_raise(ERR_LIB_ASN1, ASN1_R_MISSING_EOC);
550 * Otherwise we must hit the EXPLICIT tag end or its an error
553 ERR_raise(ERR_LIB_ASN1, ASN1_R_EXPLICIT_LENGTH_MISMATCH);
558 return asn1_template_noexp_d2i(val, in, inlen, tt, opt, ctx, depth,
568 static int asn1_template_noexp_d2i(ASN1_VALUE **val,
569 const unsigned char **in, long len,
570 const ASN1_TEMPLATE *tt, char opt,
571 ASN1_TLC *ctx, int depth,
572 OSSL_LIB_CTX *libctx, const char *propq)
577 const unsigned char *p, *q;
581 aclass = flags & ASN1_TFLG_TAG_CLASS;
586 * If field is embedded then val needs fixing so it is a pointer to
587 * a pointer to a field.
589 if (tt->flags & ASN1_TFLG_EMBED) {
590 tval = (ASN1_VALUE *)val;
594 if (flags & ASN1_TFLG_SK_MASK) {
595 /* SET OF, SEQUENCE OF */
598 /* First work out expected inner tag value */
599 if (flags & ASN1_TFLG_IMPTAG) {
603 skaclass = V_ASN1_UNIVERSAL;
604 if (flags & ASN1_TFLG_SET_OF)
607 sktag = V_ASN1_SEQUENCE;
610 ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL,
611 &p, len, sktag, skaclass, opt, ctx);
613 ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
615 } else if (ret == -1)
618 *val = (ASN1_VALUE *)sk_ASN1_VALUE_new_null();
621 * We've got a valid STACK: free up any items present
623 STACK_OF(ASN1_VALUE) *sktmp = (STACK_OF(ASN1_VALUE) *)*val;
625 while (sk_ASN1_VALUE_num(sktmp) > 0) {
626 vtmp = sk_ASN1_VALUE_pop(sktmp);
627 ASN1_item_ex_free(&vtmp, ASN1_ITEM_ptr(tt->item));
632 ERR_raise(ERR_LIB_ASN1, ERR_R_CRYPTO_LIB);
636 /* Read as many items as we can */
640 /* See if EOC found */
641 if (asn1_check_eoc(&p, len)) {
643 ERR_raise(ERR_LIB_ASN1, ASN1_R_UNEXPECTED_EOC);
651 if (asn1_item_embed_d2i(&skfield, &p, len,
652 ASN1_ITEM_ptr(tt->item), -1, 0, 0, ctx,
653 depth, libctx, propq) <= 0) {
654 ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
655 /* |skfield| may be partially allocated despite failure. */
656 ASN1_item_free(skfield, ASN1_ITEM_ptr(tt->item));
660 if (!sk_ASN1_VALUE_push((STACK_OF(ASN1_VALUE) *)*val, skfield)) {
661 ERR_raise(ERR_LIB_ASN1, ERR_R_CRYPTO_LIB);
662 ASN1_item_free(skfield, ASN1_ITEM_ptr(tt->item));
667 ERR_raise(ERR_LIB_ASN1, ASN1_R_MISSING_EOC);
670 } else if (flags & ASN1_TFLG_IMPTAG) {
671 /* IMPLICIT tagging */
672 ret = asn1_item_embed_d2i(val, &p, len,
673 ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt,
674 ctx, depth, libctx, propq);
676 ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
678 } else if (ret == -1)
681 /* Nothing special */
682 ret = asn1_item_embed_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item),
683 -1, 0, opt, ctx, depth, libctx, propq);
685 ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
687 } else if (ret == -1)
698 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
699 const unsigned char **in, long inlen,
701 int tag, int aclass, char opt, ASN1_TLC *ctx)
705 char cst, inf, free_cont = 0;
706 const unsigned char *p;
707 BUF_MEM buf = { 0, NULL, 0, 0 };
708 const unsigned char *cont = NULL;
712 ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_NULL);
713 return 0; /* Should never happen */
716 if (it->itype == ASN1_ITYPE_MSTRING) {
722 if (utype == V_ASN1_ANY) {
723 /* If type is ANY need to figure out type from tag */
724 unsigned char oclass;
726 ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_TAGGED_ANY);
730 ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_OPTIONAL_ANY);
734 ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL,
735 &p, inlen, -1, 0, 0, ctx);
737 ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
740 if (oclass != V_ASN1_UNIVERSAL)
741 utype = V_ASN1_OTHER;
745 aclass = V_ASN1_UNIVERSAL;
749 ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst,
750 &p, inlen, tag, aclass, opt, ctx);
752 ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
754 } else if (ret == -1)
757 /* SEQUENCE, SET and "OTHER" are left in encoded form */
758 if ((utype == V_ASN1_SEQUENCE)
759 || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER)) {
761 * Clear context cache for type OTHER because the auto clear when we
762 * have a exact match won't work
764 if (utype == V_ASN1_OTHER) {
767 /* SEQUENCE and SET must be constructed */
769 ERR_raise(ERR_LIB_ASN1, ASN1_R_TYPE_NOT_CONSTRUCTED);
774 /* If indefinite length constructed find the real end */
776 if (!asn1_find_end(&p, plen, inf))
780 len = p - cont + plen;
784 if (utype == V_ASN1_NULL || utype == V_ASN1_BOOLEAN
785 || utype == V_ASN1_OBJECT || utype == V_ASN1_INTEGER
786 || utype == V_ASN1_ENUMERATED) {
787 ERR_raise(ERR_LIB_ASN1, ASN1_R_TYPE_NOT_PRIMITIVE);
791 /* Free any returned 'buf' content */
794 * Should really check the internal tags are correct but some things
795 * may get this wrong. The relevant specs say that constructed string
796 * types should be OCTET STRINGs internally irrespective of the type.
797 * So instead just check for UNIVERSAL class and ignore the tag.
799 if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL, 0)) {
803 /* Append a final null to string */
804 if (!BUF_MEM_grow_clean(&buf, len + 1)) {
805 ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
809 cont = (const unsigned char *)buf.data;
816 /* We now have content length and type: translate into a structure */
817 /* asn1_ex_c2i may reuse allocated buffer, and so sets free_cont to 0 */
818 if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it))
825 OPENSSL_free(buf.data);
829 /* Translate ASN1 content octets into a structure */
831 static int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
832 int utype, char *free_cont, const ASN1_ITEM *it)
834 ASN1_VALUE **opval = NULL;
836 ASN1_TYPE *typ = NULL;
838 const ASN1_PRIMITIVE_FUNCS *pf;
842 if (pf && pf->prim_c2i)
843 return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
844 /* If ANY type clear type and set pointer to internal value */
845 if (it->utype == V_ASN1_ANY) {
847 typ = ASN1_TYPE_new();
850 *pval = (ASN1_VALUE *)typ;
852 typ = (ASN1_TYPE *)*pval;
854 if (utype != typ->type)
855 ASN1_TYPE_set(typ, utype, NULL);
857 pval = &typ->value.asn1_value;
861 if (!ossl_c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len))
867 ERR_raise(ERR_LIB_ASN1, ASN1_R_NULL_IS_WRONG_LENGTH);
870 *pval = (ASN1_VALUE *)1;
875 ERR_raise(ERR_LIB_ASN1, ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
879 tbool = (ASN1_BOOLEAN *)pval;
884 case V_ASN1_BIT_STRING:
885 if (!ossl_c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len))
890 case V_ASN1_ENUMERATED:
891 tint = (ASN1_INTEGER **)pval;
892 if (!ossl_c2i_ASN1_INTEGER(tint, &cont, len))
894 /* Fixup type to match the expected form */
895 (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
898 case V_ASN1_OCTET_STRING:
899 case V_ASN1_NUMERICSTRING:
900 case V_ASN1_PRINTABLESTRING:
901 case V_ASN1_T61STRING:
902 case V_ASN1_VIDEOTEXSTRING:
903 case V_ASN1_IA5STRING:
905 case V_ASN1_GENERALIZEDTIME:
906 case V_ASN1_GRAPHICSTRING:
907 case V_ASN1_VISIBLESTRING:
908 case V_ASN1_GENERALSTRING:
909 case V_ASN1_UNIVERSALSTRING:
910 case V_ASN1_BMPSTRING:
911 case V_ASN1_UTF8STRING:
914 case V_ASN1_SEQUENCE:
916 if (utype == V_ASN1_BMPSTRING && (len & 1)) {
917 ERR_raise(ERR_LIB_ASN1, ASN1_R_BMPSTRING_IS_WRONG_LENGTH);
920 if (utype == V_ASN1_UNIVERSALSTRING && (len & 3)) {
921 ERR_raise(ERR_LIB_ASN1, ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH);
924 if (utype == V_ASN1_GENERALIZEDTIME && (len < 15)) {
925 ERR_raise(ERR_LIB_ASN1, ASN1_R_GENERALIZEDTIME_IS_TOO_SHORT);
928 if (utype == V_ASN1_UTCTIME && (len < 13)) {
929 ERR_raise(ERR_LIB_ASN1, ASN1_R_UTCTIME_IS_TOO_SHORT);
932 /* All based on ASN1_STRING and handled the same */
934 stmp = ASN1_STRING_type_new(utype);
936 ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
939 *pval = (ASN1_VALUE *)stmp;
941 stmp = (ASN1_STRING *)*pval;
944 /* If we've already allocated a buffer use it */
946 ASN1_STRING_set0(stmp, (unsigned char *)cont /* UGLY CAST! */, len);
949 if (!ASN1_STRING_set(stmp, cont, len)) {
950 ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
951 ASN1_STRING_free(stmp);
958 /* If ASN1_ANY and NULL type fix up value */
959 if (typ && (utype == V_ASN1_NULL))
960 typ->value.ptr = NULL;
973 * This function finds the end of an ASN1 structure when passed its maximum
974 * length, whether it is indefinite length and a pointer to the content. This
975 * is more efficient than calling asn1_collect because it does not recurse on
976 * each indefinite length header.
979 static int asn1_find_end(const unsigned char **in, long len, char inf)
981 uint32_t expected_eoc;
983 const unsigned char *p = *in, *q;
984 /* If not indefinite length constructed just add length */
991 * Indefinite length constructed form. Find the end when enough EOCs are
992 * found. If more indefinite length constructed headers are encountered
993 * increment the expected eoc count otherwise just skip to the end of the
997 if (asn1_check_eoc(&p, len)) {
999 if (expected_eoc == 0)
1005 /* Just read in a header: only care about the length */
1006 if (!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len,
1008 ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
1012 if (expected_eoc == UINT32_MAX) {
1013 ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
1023 ERR_raise(ERR_LIB_ASN1, ASN1_R_MISSING_EOC);
1031 * This function collects the asn1 data from a constructed string type into
1032 * a buffer. The values of 'in' and 'len' should refer to the contents of the
1033 * constructed type and 'inf' should be set if it is indefinite length.
1036 #ifndef ASN1_MAX_STRING_NEST
1038 * This determines how many levels of recursion are permitted in ASN1 string
1039 * types. If it is not limited stack overflows can occur. If set to zero no
1040 * recursion is allowed at all. Although zero should be adequate examples
1041 * exist that require a value of 1. So 5 should be more than enough.
1043 # define ASN1_MAX_STRING_NEST 5
1046 static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
1047 char inf, int tag, int aclass, int depth)
1049 const unsigned char *p, *q;
1055 * If no buffer and not indefinite length constructed just pass over the
1065 if (asn1_check_eoc(&p, len)) {
1067 * EOC is illegal outside indefinite length constructed form
1070 ERR_raise(ERR_LIB_ASN1, ASN1_R_UNEXPECTED_EOC);
1077 if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p,
1078 len, tag, aclass, 0, NULL)) {
1079 ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
1083 /* If indefinite length constructed update max length */
1085 if (depth >= ASN1_MAX_STRING_NEST) {
1086 ERR_raise(ERR_LIB_ASN1, ASN1_R_NESTED_ASN1_STRING);
1089 if (!asn1_collect(buf, &p, plen, ininf, tag, aclass, depth + 1))
1091 } else if (plen && !collect_data(buf, &p, plen))
1096 ERR_raise(ERR_LIB_ASN1, ASN1_R_MISSING_EOC);
1103 static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen)
1108 if (!BUF_MEM_grow_clean(buf, len + plen)) {
1109 ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
1112 memcpy(buf->data + len, *p, plen);
1118 /* Check for ASN1 EOC and swallow it if found */
1120 static int asn1_check_eoc(const unsigned char **in, long len)
1122 const unsigned char *p;
1127 if (p[0] == '\0' && p[1] == '\0') {
1135 * Check an ASN1 tag and length: a bit like ASN1_get_object but it sets the
1136 * length for indefinite length constructed form, we don't know the exact
1137 * length but we can set an upper bound to the amount of data available minus
1138 * the header length just read.
1141 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
1142 char *inf, char *cst,
1143 const unsigned char **in, long len,
1144 int exptag, int expclass, char opt, ASN1_TLC *ctx)
1149 const unsigned char *p, *q;
1154 ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_SMALL);
1157 if (ctx != NULL && ctx->valid) {
1160 pclass = ctx->pclass;
1164 i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);
1168 ctx->pclass = pclass;
1170 ctx->hdrlen = p - q;
1173 * If definite length, and no error, length + header can't exceed
1174 * total amount of data available.
1176 if ((i & 0x81) == 0 && (plen + ctx->hdrlen) > len) {
1177 ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LONG);
1183 if ((i & 0x80) != 0) {
1184 ERR_raise(ERR_LIB_ASN1, ASN1_R_BAD_OBJECT_HEADER);
1188 if (exptag != ptag || expclass != pclass) {
1190 * If type is OPTIONAL, not an error: indicate missing type.
1194 ERR_raise(ERR_LIB_ASN1, ASN1_R_WRONG_TAG);
1198 * We have a tag and class match: assume we are going to do something
1201 asn1_tlc_clear(ctx);
1205 plen = len - (p - q);
1211 *cst = i & V_ASN1_CONSTRUCTED;
1226 asn1_tlc_clear(ctx);