409 lines
12 KiB
C
409 lines
12 KiB
C
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/* $OpenBSD: asn1_par.c,v 1.28 2020/01/09 11:27:21 inoguchi Exp $ */
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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 <openssl/asn1.h>
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#include <openssl/buffer.h>
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#include <openssl/objects.h>
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static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
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int indent);
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static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
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int offset, int depth, int indent, int dump);
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static int
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asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
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int indent)
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{
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char str[128];
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const char *p;
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if (constructed & V_ASN1_CONSTRUCTED)
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p="cons: ";
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else
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p="prim: ";
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if (BIO_write(bp, p, 6) < 6)
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goto err;
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BIO_indent(bp, indent, 128);
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p = str;
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if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE)
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snprintf(str, sizeof str, "priv [ %d ] ", tag);
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else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC)
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snprintf(str, sizeof str, "cont [ %d ]", tag);
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else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION)
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snprintf(str, sizeof str, "appl [ %d ]", tag);
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else if (tag > 30)
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snprintf(str, sizeof str, "<ASN1 %d>", tag);
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else
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p = ASN1_tag2str(tag);
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if (BIO_printf(bp, "%-18s", p) <= 0)
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goto err;
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return (1);
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err:
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return (0);
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}
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int
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ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent)
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{
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return (asn1_parse2(bp, &pp, len, 0, 0, indent, 0));
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}
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int
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ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent, int dump)
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{
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return (asn1_parse2(bp, &pp, len, 0, 0, indent, dump));
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}
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static int
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asn1_parse2(BIO *bp, const unsigned char **pp, long length, int offset,
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int depth, int indent, int dump)
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{
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const unsigned char *p, *ep, *tot, *op, *opp;
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long len;
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int tag, xclass, ret = 0;
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int nl, hl, j, r;
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ASN1_OBJECT *o = NULL;
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ASN1_OCTET_STRING *os = NULL;
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ASN1_INTEGER *ai = NULL;
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ASN1_ENUMERATED *ae = NULL;
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/* ASN1_BMPSTRING *bmp=NULL;*/
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int dump_indent;
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dump_indent = 6; /* Because we know BIO_dump_indent() */
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p = *pp;
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tot = p + length;
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op = p - 1;
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if (depth > 128) {
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BIO_printf(bp, "Max depth exceeded\n");
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goto end;
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}
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while ((p < tot) && (op < p)) {
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op = p;
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j = ASN1_get_object(&p, &len, &tag, &xclass, length);
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if (j & 0x80) {
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if (BIO_write(bp, "Error in encoding\n", 18) <= 0)
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goto end;
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ret = 0;
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goto end;
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}
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hl = (p - op);
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length -= hl;
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/* if j == 0x21 it is a constructed indefinite length object */
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if (BIO_printf(bp, "%5ld:", (long)offset +
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(long)(op - *pp)) <= 0)
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goto end;
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if (j != (V_ASN1_CONSTRUCTED | 1)) {
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if (BIO_printf(bp, "d=%-2d hl=%ld l=%4ld ",
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depth, (long)hl, len) <= 0)
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goto end;
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} else {
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if (BIO_printf(bp, "d=%-2d hl=%ld l=inf ",
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depth, (long)hl) <= 0)
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goto end;
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}
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if (!asn1_print_info(bp, tag, xclass, j, (indent) ? depth : 0))
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goto end;
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if (j & V_ASN1_CONSTRUCTED) {
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ep = p + len;
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if (BIO_write(bp, "\n", 1) <= 0)
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goto end;
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if (len > length) {
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BIO_printf(bp, "length is greater than %ld\n",
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length);
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ret = 0;
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goto end;
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}
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if ((j == 0x21) && (len == 0)) {
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for (;;) {
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r = asn1_parse2(bp, &p, (long)(tot - p),
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offset + (p - *pp), depth + 1,
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indent, dump);
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if (r == 0) {
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ret = 0;
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goto end;
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}
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if ((r == 2) || (p >= tot)) {
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len = (long)(p - ep);
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break;
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}
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}
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} else {
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while (p < ep) {
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r = asn1_parse2(bp, &p, (long)(ep - p),
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offset + (p - *pp), depth + 1,
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indent, dump);
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if (r == 0) {
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ret = 0;
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goto end;
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}
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}
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}
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} else if (xclass != 0) {
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p += len;
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if (BIO_write(bp, "\n", 1) <= 0)
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goto end;
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} else {
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nl = 0;
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if ((tag == V_ASN1_PRINTABLESTRING) ||
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(tag == V_ASN1_T61STRING) ||
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(tag == V_ASN1_IA5STRING) ||
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(tag == V_ASN1_VISIBLESTRING) ||
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(tag == V_ASN1_NUMERICSTRING) ||
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(tag == V_ASN1_UTF8STRING) ||
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(tag == V_ASN1_UTCTIME) ||
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(tag == V_ASN1_GENERALIZEDTIME)) {
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if (BIO_write(bp, ":", 1) <= 0)
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goto end;
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if ((len > 0) &&
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BIO_write(bp, (const char *)p, (int)len) !=
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(int)len)
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goto end;
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} else if (tag == V_ASN1_OBJECT) {
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opp = op;
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if (d2i_ASN1_OBJECT(&o, &opp, len + hl) !=
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NULL) {
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if (BIO_write(bp, ":", 1) <= 0)
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goto end;
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i2a_ASN1_OBJECT(bp, o);
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} else {
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if (BIO_write(bp, ":BAD OBJECT",
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11) <= 0)
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goto end;
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}
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} else if (tag == V_ASN1_BOOLEAN) {
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int ii;
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opp = op;
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ii = d2i_ASN1_BOOLEAN(NULL, &opp, len + hl);
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if (ii < 0) {
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if (BIO_write(bp, "Bad boolean\n",
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12) <= 0)
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goto end;
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}
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BIO_printf(bp, ":%d", ii);
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} else if (tag == V_ASN1_BMPSTRING) {
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/* do the BMP thang */
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} else if (tag == V_ASN1_OCTET_STRING) {
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int i, printable = 1;
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opp = op;
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os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl);
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if (os != NULL && os->length > 0) {
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opp = os->data;
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/* testing whether the octet string is
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* printable */
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for (i = 0; i < os->length; i++) {
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if (((opp[i] < ' ') &&
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(opp[i] != '\n') &&
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(opp[i] != '\r') &&
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(opp[i] != '\t')) ||
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(opp[i] > '~')) {
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printable = 0;
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break;
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}
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}
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if (printable) {
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/* printable string */
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if (BIO_write(bp, ":", 1) <= 0)
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goto end;
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if (BIO_write(bp, (const char *)opp,
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os->length) <= 0)
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goto end;
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} else if (!dump) {
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/* not printable => print octet string
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* as hex dump */
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if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0)
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goto end;
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for (i = 0; i < os->length; i++) {
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if (BIO_printf(bp,
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"%02X", opp[i]) <= 0)
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goto end;
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}
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} else {
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/* print the normal dump */
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if (!nl) {
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if (BIO_write(bp, "\n", 1) <= 0)
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goto end;
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}
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if (BIO_dump_indent(bp,
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(const char *)opp,
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((dump == -1 || dump >
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os->length) ? os->length : dump),
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dump_indent) <= 0)
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goto end;
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nl = 1;
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}
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}
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ASN1_OCTET_STRING_free(os);
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os = NULL;
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} else if (tag == V_ASN1_INTEGER) {
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int i;
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opp = op;
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ai = d2i_ASN1_INTEGER(NULL, &opp, len + hl);
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if (ai != NULL) {
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if (BIO_write(bp, ":", 1) <= 0)
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goto end;
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if (ai->type == V_ASN1_NEG_INTEGER)
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if (BIO_write(bp, "-", 1) <= 0)
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goto end;
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for (i = 0; i < ai->length; i++) {
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if (BIO_printf(bp, "%02X",
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ai->data[i]) <= 0)
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goto end;
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}
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if (ai->length == 0) {
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if (BIO_write(bp, "00", 2) <= 0)
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goto end;
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}
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} else {
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if (BIO_write(bp, "BAD INTEGER", 11) <= 0)
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goto end;
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}
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ASN1_INTEGER_free(ai);
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ai = NULL;
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} else if (tag == V_ASN1_ENUMERATED) {
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int i;
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opp = op;
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ae = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl);
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if (ae != NULL) {
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if (BIO_write(bp, ":", 1) <= 0)
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goto end;
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if (ae->type == V_ASN1_NEG_ENUMERATED)
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if (BIO_write(bp, "-", 1) <= 0)
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goto end;
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for (i = 0; i < ae->length; i++) {
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if (BIO_printf(bp, "%02X",
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ae->data[i]) <= 0)
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goto end;
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}
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if (ae->length == 0) {
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if (BIO_write(bp, "00", 2) <= 0)
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goto end;
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}
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} else {
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if (BIO_write(bp, "BAD ENUMERATED", 14) <= 0)
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goto end;
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}
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ASN1_ENUMERATED_free(ae);
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ae = NULL;
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} else if (len > 0 && dump) {
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if (!nl) {
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if (BIO_write(bp, "\n", 1) <= 0)
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goto end;
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}
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|
|
if (BIO_dump_indent(bp, (const char *)p,
|
||
|
|
((dump == -1 || dump > len) ? len : dump),
|
||
|
|
dump_indent) <= 0)
|
||
|
|
goto end;
|
||
|
|
nl = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!nl) {
|
||
|
|
if (BIO_write(bp, "\n", 1) <= 0)
|
||
|
|
goto end;
|
||
|
|
}
|
||
|
|
p += len;
|
||
|
|
if ((tag == V_ASN1_EOC) && (xclass == 0)) {
|
||
|
|
ret = 2; /* End of sequence */
|
||
|
|
goto end;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
length -= len;
|
||
|
|
}
|
||
|
|
ret = 1;
|
||
|
|
|
||
|
|
end:
|
||
|
|
if (o != NULL)
|
||
|
|
ASN1_OBJECT_free(o);
|
||
|
|
ASN1_OCTET_STRING_free(os);
|
||
|
|
ASN1_INTEGER_free(ai);
|
||
|
|
ASN1_ENUMERATED_free(ae);
|
||
|
|
*pp = p;
|
||
|
|
return (ret);
|
||
|
|
}
|
||
|
|
|
||
|
|
const char *
|
||
|
|
ASN1_tag2str(int tag)
|
||
|
|
{
|
||
|
|
static const char * const tag2str[] = {
|
||
|
|
"EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING", /* 0-4 */
|
||
|
|
"NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL", /* 5-9 */
|
||
|
|
"ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>", /* 10-13 */
|
||
|
|
"<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET", /* 15-17 */
|
||
|
|
"NUMERICSTRING", "PRINTABLESTRING", "T61STRING", /* 18-20 */
|
||
|
|
"VIDEOTEXSTRING", "IA5STRING", "UTCTIME", "GENERALIZEDTIME", /* 21-24 */
|
||
|
|
"GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING", /* 25-27 */
|
||
|
|
"UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING" /* 28-30 */
|
||
|
|
};
|
||
|
|
|
||
|
|
if ((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED))
|
||
|
|
tag &= ~0x100;
|
||
|
|
|
||
|
|
if (tag < 0 || tag > 30)
|
||
|
|
return "(unknown)";
|
||
|
|
return tag2str[tag];
|
||
|
|
}
|