335 lines
9.9 KiB
C
335 lines
9.9 KiB
C
/* crypto/asn1/a_bytes.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include "cryptlib.h"
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#include <openssl/asn1.h>
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static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c,
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int depth);
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static ASN1_STRING *int_d2i_ASN1_bytes(ASN1_STRING **a,
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const unsigned char **pp, long length,
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int Ptag, int Pclass, int depth,
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int *perr);
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/*
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* type is a 'bitmap' of acceptable string types.
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*/
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ASN1_STRING *d2i_ASN1_type_bytes(ASN1_STRING **a, const unsigned char **pp,
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long length, int type)
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{
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ASN1_STRING *ret = NULL;
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const unsigned char *p;
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unsigned char *s;
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long len;
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int inf, tag, xclass;
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int i = 0;
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p = *pp;
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inf = ASN1_get_object(&p, &len, &tag, &xclass, length);
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if (inf & 0x80)
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goto err;
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if (tag >= 32) {
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i = ASN1_R_TAG_VALUE_TOO_HIGH;
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goto err;
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}
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if (!(ASN1_tag2bit(tag) & type)) {
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i = ASN1_R_WRONG_TYPE;
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goto err;
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}
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/* If a bit-string, exit early */
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if (tag == V_ASN1_BIT_STRING)
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return (d2i_ASN1_BIT_STRING(a, pp, length));
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if ((a == NULL) || ((*a) == NULL)) {
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if ((ret = ASN1_STRING_new()) == NULL)
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return (NULL);
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} else
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ret = (*a);
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if (len != 0) {
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s = OPENSSL_malloc((int)len + 1);
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if (s == NULL) {
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i = ERR_R_MALLOC_FAILURE;
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goto err;
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}
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memcpy(s, p, (int)len);
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s[len] = '\0';
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p += len;
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} else
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s = NULL;
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if (ret->data != NULL)
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OPENSSL_free(ret->data);
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ret->length = (int)len;
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ret->data = s;
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ret->type = tag;
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if (a != NULL)
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(*a) = ret;
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*pp = p;
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return (ret);
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err:
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ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES, i);
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if ((ret != NULL) && ((a == NULL) || (*a != ret)))
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ASN1_STRING_free(ret);
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return (NULL);
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}
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int i2d_ASN1_bytes(ASN1_STRING *a, unsigned char **pp, int tag, int xclass)
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{
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int ret, r, constructed;
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unsigned char *p;
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if (a == NULL)
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return (0);
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if (tag == V_ASN1_BIT_STRING)
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return (i2d_ASN1_BIT_STRING(a, pp));
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ret = a->length;
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r = ASN1_object_size(0, ret, tag);
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if (pp == NULL)
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return (r);
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p = *pp;
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if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET))
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constructed = 1;
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else
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constructed = 0;
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ASN1_put_object(&p, constructed, ret, tag, xclass);
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memcpy(p, a->data, a->length);
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p += a->length;
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*pp = p;
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return (r);
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}
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/*
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* Maximum recursion depth of d2i_ASN1_bytes(): much more than should be
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* encountered in pratice.
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*/
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#define ASN1_BYTES_MAXDEPTH 20
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ASN1_STRING *d2i_ASN1_bytes(ASN1_STRING **a, const unsigned char **pp,
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long length, int Ptag, int Pclass)
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{
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int err = 0;
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ASN1_STRING *s = int_d2i_ASN1_bytes(a, pp, length, Ptag, Pclass, 0, &err);
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if (err != 0)
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ASN1err(ASN1_F_D2I_ASN1_BYTES, err);
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return s;
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}
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static ASN1_STRING *int_d2i_ASN1_bytes(ASN1_STRING **a,
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const unsigned char **pp, long length,
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int Ptag, int Pclass,
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int depth, int *perr)
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{
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ASN1_STRING *ret = NULL;
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const unsigned char *p;
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unsigned char *s;
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long len;
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int inf, tag, xclass;
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if (depth > ASN1_BYTES_MAXDEPTH) {
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*perr = ASN1_R_NESTED_ASN1_STRING;
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return NULL;
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}
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if ((a == NULL) || ((*a) == NULL)) {
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if ((ret = ASN1_STRING_new()) == NULL)
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return (NULL);
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} else
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ret = (*a);
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p = *pp;
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inf = ASN1_get_object(&p, &len, &tag, &xclass, length);
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if (inf & 0x80) {
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*perr = ASN1_R_BAD_OBJECT_HEADER;
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goto err;
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}
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if (tag != Ptag) {
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*perr = ASN1_R_WRONG_TAG;
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goto err;
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}
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if (inf & V_ASN1_CONSTRUCTED) {
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ASN1_const_CTX c;
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c.error = 0;
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c.pp = pp;
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c.p = p;
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c.inf = inf;
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c.slen = len;
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c.tag = Ptag;
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c.xclass = Pclass;
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c.max = (length == 0) ? 0 : (p + length);
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if (!asn1_collate_primitive(ret, &c, depth)) {
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*perr = c.error;
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goto err;
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} else {
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p = c.p;
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}
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} else {
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if (len != 0) {
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if ((ret->length < len) || (ret->data == NULL)) {
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s = OPENSSL_malloc((int)len + 1);
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if (s == NULL) {
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*perr = ERR_R_MALLOC_FAILURE;
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goto err;
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}
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if (ret->data != NULL)
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OPENSSL_free(ret->data);
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} else
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s = ret->data;
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memcpy(s, p, (int)len);
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s[len] = '\0';
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p += len;
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} else {
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s = NULL;
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if (ret->data != NULL)
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OPENSSL_free(ret->data);
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}
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ret->length = (int)len;
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ret->data = s;
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ret->type = Ptag;
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}
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if (a != NULL)
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(*a) = ret;
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*pp = p;
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return (ret);
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err:
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if ((ret != NULL) && ((a == NULL) || (*a != ret)))
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ASN1_STRING_free(ret);
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return (NULL);
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}
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/*
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* We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapse them
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* into the one structure that is then returned
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*/
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/*
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* There have been a few bug fixes for this function from Paul Keogh
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* <paul.keogh@sse.ie>, many thanks to him
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*/
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static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c,
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int depth)
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{
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ASN1_STRING *os = NULL;
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BUF_MEM b;
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int num;
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b.length = 0;
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b.max = 0;
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b.data = NULL;
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if (a == NULL) {
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c->error = ERR_R_PASSED_NULL_PARAMETER;
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goto err;
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}
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num = 0;
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for (;;) {
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if (c->inf & 1) {
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c->eos = ASN1_const_check_infinite_end(&c->p,
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(long)(c->max - c->p));
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if (c->eos)
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break;
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} else {
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if (c->slen <= 0)
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break;
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}
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c->q = c->p;
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if (int_d2i_ASN1_bytes(&os, &c->p, c->max - c->p, c->tag, c->xclass,
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depth + 1, &c->error) == NULL) {
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goto err;
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}
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if (!BUF_MEM_grow_clean(&b, num + os->length)) {
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c->error = ERR_R_BUF_LIB;
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goto err;
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}
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memcpy(&(b.data[num]), os->data, os->length);
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if (!(c->inf & 1))
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c->slen -= (c->p - c->q);
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num += os->length;
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}
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if (!asn1_const_Finish(c))
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goto err;
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a->length = num;
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if (a->data != NULL)
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OPENSSL_free(a->data);
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a->data = (unsigned char *)b.data;
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if (os != NULL)
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ASN1_STRING_free(os);
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return (1);
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err:
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if (os != NULL)
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ASN1_STRING_free(os);
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if (b.data != NULL)
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OPENSSL_free(b.data);
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return (0);
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}
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