483 lines
13 KiB
C
483 lines
13 KiB
C
/* crypto/asn1/asn1_lib.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 <limits.h>
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#include "cryptlib.h"
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#include <openssl/asn1.h>
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#include <openssl/asn1_mac.h>
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static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
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long max);
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static void asn1_put_length(unsigned char **pp, int length);
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const char ASN1_version[] = "ASN.1" OPENSSL_VERSION_PTEXT;
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static int _asn1_check_infinite_end(const unsigned char **p, long len)
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{
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/*
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* If there is 0 or 1 byte left, the length check should pick things up
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*/
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if (len <= 0)
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return (1);
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else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) {
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(*p) += 2;
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return (1);
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}
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return (0);
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}
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int ASN1_check_infinite_end(unsigned char **p, long len)
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{
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return _asn1_check_infinite_end((const unsigned char **)p, len);
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}
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int ASN1_const_check_infinite_end(const unsigned char **p, long len)
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{
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return _asn1_check_infinite_end(p, len);
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}
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int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
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int *pclass, long omax)
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{
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int i, ret;
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long l;
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const unsigned char *p = *pp;
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int tag, xclass, inf;
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long max = omax;
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if (!max)
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goto err;
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ret = (*p & V_ASN1_CONSTRUCTED);
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xclass = (*p & V_ASN1_PRIVATE);
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i = *p & V_ASN1_PRIMITIVE_TAG;
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if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */
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p++;
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if (--max == 0)
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goto err;
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l = 0;
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while (*p & 0x80) {
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l <<= 7L;
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l |= *(p++) & 0x7f;
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if (--max == 0)
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goto err;
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if (l > (INT_MAX >> 7L))
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goto err;
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}
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l <<= 7L;
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l |= *(p++) & 0x7f;
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tag = (int)l;
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if (--max == 0)
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goto err;
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} else {
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tag = i;
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p++;
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if (--max == 0)
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goto err;
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}
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*ptag = tag;
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*pclass = xclass;
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if (!asn1_get_length(&p, &inf, plength, max))
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goto err;
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if (inf && !(ret & V_ASN1_CONSTRUCTED))
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goto err;
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#if 0
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fprintf(stderr, "p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n",
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(int)p, *plength, omax, (int)*pp, (int)(p + *plength),
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(int)(omax + *pp));
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#endif
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if (*plength > (omax - (p - *pp))) {
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ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_TOO_LONG);
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/*
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* Set this so that even if things are not long enough the values are
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* set correctly
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*/
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ret |= 0x80;
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}
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*pp = p;
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return (ret | inf);
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err:
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ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_HEADER_TOO_LONG);
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return (0x80);
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}
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static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
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long max)
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{
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const unsigned char *p = *pp;
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unsigned long ret = 0;
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unsigned long i;
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if (max-- < 1)
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return 0;
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if (*p == 0x80) {
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*inf = 1;
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ret = 0;
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p++;
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} else {
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*inf = 0;
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i = *p & 0x7f;
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if (*(p++) & 0x80) {
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if (i > sizeof(ret) || max < (long)i)
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return 0;
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while (i-- > 0) {
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ret <<= 8L;
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ret |= *(p++);
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}
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} else
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ret = i;
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}
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if (ret > LONG_MAX)
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return 0;
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*pp = p;
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*rl = (long)ret;
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return 1;
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}
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/*
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* class 0 is constructed constructed == 2 for indefinite length constructed
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*/
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void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
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int xclass)
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{
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unsigned char *p = *pp;
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int i, ttag;
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i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
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i |= (xclass & V_ASN1_PRIVATE);
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if (tag < 31)
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*(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG);
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else {
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*(p++) = i | V_ASN1_PRIMITIVE_TAG;
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for (i = 0, ttag = tag; ttag > 0; i++)
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ttag >>= 7;
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ttag = i;
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while (i-- > 0) {
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p[i] = tag & 0x7f;
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if (i != (ttag - 1))
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p[i] |= 0x80;
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tag >>= 7;
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}
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p += ttag;
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}
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if (constructed == 2)
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*(p++) = 0x80;
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else
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asn1_put_length(&p, length);
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*pp = p;
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}
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int ASN1_put_eoc(unsigned char **pp)
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{
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unsigned char *p = *pp;
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*p++ = 0;
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*p++ = 0;
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*pp = p;
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return 2;
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}
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static void asn1_put_length(unsigned char **pp, int length)
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{
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unsigned char *p = *pp;
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int i, l;
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if (length <= 127)
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*(p++) = (unsigned char)length;
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else {
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l = length;
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for (i = 0; l > 0; i++)
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l >>= 8;
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*(p++) = i | 0x80;
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l = i;
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while (i-- > 0) {
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p[i] = length & 0xff;
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length >>= 8;
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}
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p += l;
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}
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*pp = p;
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}
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int ASN1_object_size(int constructed, int length, int tag)
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{
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int ret = 1;
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if (length < 0)
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return -1;
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if (tag >= 31) {
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while (tag > 0) {
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tag >>= 7;
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ret++;
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}
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}
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if (constructed == 2) {
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ret += 3;
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} else {
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ret++;
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if (length > 127) {
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int tmplen = length;
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while (tmplen > 0) {
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tmplen >>= 8;
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ret++;
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}
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}
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}
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if (ret >= INT_MAX - length)
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return -1;
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return ret + length;
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}
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static int _asn1_Finish(ASN1_const_CTX *c)
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{
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if ((c->inf == (1 | V_ASN1_CONSTRUCTED)) && (!c->eos)) {
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if (!ASN1_const_check_infinite_end(&c->p, c->slen)) {
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c->error = ERR_R_MISSING_ASN1_EOS;
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return (0);
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}
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}
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if (((c->slen != 0) && !(c->inf & 1)) || ((c->slen < 0) && (c->inf & 1))) {
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c->error = ERR_R_ASN1_LENGTH_MISMATCH;
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return (0);
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}
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return (1);
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}
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int asn1_Finish(ASN1_CTX *c)
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{
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return _asn1_Finish((ASN1_const_CTX *)c);
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}
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int asn1_const_Finish(ASN1_const_CTX *c)
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{
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return _asn1_Finish(c);
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}
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int asn1_GetSequence(ASN1_const_CTX *c, long *length)
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{
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const unsigned char *q;
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q = c->p;
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c->inf = ASN1_get_object(&(c->p), &(c->slen), &(c->tag), &(c->xclass),
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*length);
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if (c->inf & 0x80) {
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c->error = ERR_R_BAD_GET_ASN1_OBJECT_CALL;
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return (0);
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}
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if (c->tag != V_ASN1_SEQUENCE) {
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c->error = ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
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return (0);
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}
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(*length) -= (c->p - q);
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if (c->max && (*length < 0)) {
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c->error = ERR_R_ASN1_LENGTH_MISMATCH;
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return (0);
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}
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if (c->inf == (1 | V_ASN1_CONSTRUCTED))
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c->slen = *length;
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c->eos = 0;
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return (1);
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}
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int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
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{
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if (str == NULL)
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return 0;
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dst->type = str->type;
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if (!ASN1_STRING_set(dst, str->data, str->length))
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return 0;
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dst->flags = str->flags;
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return 1;
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}
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ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
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{
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ASN1_STRING *ret;
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if (!str)
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return NULL;
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ret = ASN1_STRING_new();
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if (!ret)
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return NULL;
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if (!ASN1_STRING_copy(ret, str)) {
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ASN1_STRING_free(ret);
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return NULL;
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}
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return ret;
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}
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int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
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{
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unsigned char *c;
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const char *data = _data;
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if (len < 0) {
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if (data == NULL)
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return (0);
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else
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len = strlen(data);
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}
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if ((str->length <= len) || (str->data == NULL)) {
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c = str->data;
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if (c == NULL)
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str->data = OPENSSL_malloc(len + 1);
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else
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str->data = OPENSSL_realloc(c, len + 1);
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if (str->data == NULL) {
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ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE);
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str->data = c;
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return (0);
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}
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}
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str->length = len;
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if (data != NULL) {
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memcpy(str->data, data, len);
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/* an allowance for strings :-) */
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str->data[len] = '\0';
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}
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return (1);
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}
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void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
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{
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if (str->data)
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OPENSSL_free(str->data);
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str->data = data;
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str->length = len;
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}
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ASN1_STRING *ASN1_STRING_new(void)
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{
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return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
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}
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ASN1_STRING *ASN1_STRING_type_new(int type)
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{
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ASN1_STRING *ret;
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ret = (ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
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if (ret == NULL) {
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ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE);
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return (NULL);
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}
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ret->length = 0;
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ret->type = type;
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ret->data = NULL;
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ret->flags = 0;
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return (ret);
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}
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void ASN1_STRING_free(ASN1_STRING *a)
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{
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if (a == NULL)
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return;
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if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
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OPENSSL_free(a->data);
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OPENSSL_free(a);
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}
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void ASN1_STRING_clear_free(ASN1_STRING *a)
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{
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if (a && a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
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OPENSSL_cleanse(a->data, a->length);
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ASN1_STRING_free(a);
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}
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int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
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{
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int i;
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i = (a->length - b->length);
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if (i == 0) {
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i = memcmp(a->data, b->data, a->length);
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if (i == 0)
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return (a->type - b->type);
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else
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return (i);
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} else
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return (i);
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}
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void asn1_add_error(const unsigned char *address, int offset)
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{
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char buf1[DECIMAL_SIZE(address) + 1], buf2[DECIMAL_SIZE(offset) + 1];
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BIO_snprintf(buf1, sizeof buf1, "%lu", (unsigned long)address);
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BIO_snprintf(buf2, sizeof buf2, "%d", offset);
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ERR_add_error_data(4, "address=", buf1, " offset=", buf2);
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}
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int ASN1_STRING_length(const ASN1_STRING *x)
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{
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return M_ASN1_STRING_length(x);
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}
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void ASN1_STRING_length_set(ASN1_STRING *x, int len)
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{
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M_ASN1_STRING_length_set(x, len);
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return;
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}
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int ASN1_STRING_type(ASN1_STRING *x)
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{
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return M_ASN1_STRING_type(x);
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}
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unsigned char *ASN1_STRING_data(ASN1_STRING *x)
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{
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return M_ASN1_STRING_data(x);
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}
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