353 lines
9.3 KiB
C
353 lines
9.3 KiB
C
/*
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* Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Portions Copyright (c) 2009 Apple Inc. All rights reserved.
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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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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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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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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE 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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#include "der_locl.h"
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#include <com_err.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <getarg.h>
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#include <err.h>
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#include <der.h>
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static int indent_flag = 1;
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static int inner_flag = 0;
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static unsigned long indefinite_form_loop;
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static unsigned long indefinite_form_loop_max = 10000;
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static size_t
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loop (unsigned char *buf, size_t len, int indent)
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{
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unsigned char *start_buf = buf;
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while (len > 0) {
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int ret;
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Der_class class;
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Der_type type;
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unsigned int tag;
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size_t sz;
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size_t length;
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size_t loop_length = 0;
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int end_tag = 0;
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const char *tagname;
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ret = der_get_tag (buf, len, &class, &type, &tag, &sz);
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if (ret)
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errx (1, "der_get_tag: %s", error_message (ret));
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if (sz > len)
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errx (1, "unreasonable length (%u) > %u",
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(unsigned)sz, (unsigned)len);
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buf += sz;
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len -= sz;
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if (indent_flag) {
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int i;
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for (i = 0; i < indent; ++i)
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printf (" ");
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}
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printf ("%s %s ", der_get_class_name(class), der_get_type_name(type));
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tagname = der_get_tag_name(tag);
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if (class == ASN1_C_UNIV && tagname != NULL)
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printf ("%s = ", tagname);
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else
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printf ("tag %d = ", tag);
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ret = der_get_length (buf, len, &length, &sz);
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if (ret)
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errx (1, "der_get_tag: %s", error_message (ret));
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if (sz > len)
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errx (1, "unreasonable tag length (%u) > %u",
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(unsigned)sz, (unsigned)len);
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buf += sz;
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len -= sz;
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if (length == ASN1_INDEFINITE) {
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if ((class == ASN1_C_UNIV && type == PRIM && tag == UT_OctetString) ||
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(class == ASN1_C_CONTEXT && type == CONS) ||
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(class == ASN1_C_UNIV && type == CONS && tag == UT_Sequence) ||
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(class == ASN1_C_UNIV && type == CONS && tag == UT_Set)) {
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printf("*INDEFINITE FORM*");
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} else {
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fflush(stdout);
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errx(1, "indef form used on unsupported object");
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}
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end_tag = 1;
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if (indefinite_form_loop > indefinite_form_loop_max)
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errx(1, "indefinite form used recursively more then %lu "
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"times, aborting", indefinite_form_loop_max);
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indefinite_form_loop++;
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length = len;
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} else if (length > len) {
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printf("\n");
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fflush(stdout);
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errx (1, "unreasonable inner length (%u) > %u",
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(unsigned)length, (unsigned)len);
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}
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if (class == ASN1_C_CONTEXT || class == ASN1_C_APPL) {
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printf ("%lu bytes [%u]", (unsigned long)length, tag);
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if (type == CONS) {
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printf("\n");
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loop_length = loop (buf, length, indent + 2);
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} else {
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printf(" IMPLICIT content\n");
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}
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} else if (class == ASN1_C_UNIV) {
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switch (tag) {
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case UT_EndOfContent:
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printf (" INDEFINITE length was %lu\n",
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(unsigned long)(buf - start_buf));
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break;
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case UT_Set :
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case UT_Sequence :
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printf ("%lu bytes {\n", (unsigned long)length);
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loop_length = loop (buf, length, indent + 2);
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if (indent_flag) {
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int i;
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for (i = 0; i < indent; ++i)
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printf (" ");
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printf ("}\n");
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} else
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printf ("} indent = %d\n", indent / 2);
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break;
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case UT_Integer : {
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int val;
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if (length <= sizeof(val)) {
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ret = der_get_integer (buf, length, &val, NULL);
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if (ret)
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errx (1, "der_get_integer: %s", error_message (ret));
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printf ("integer %d\n", val);
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} else {
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heim_integer vali;
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char *p;
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ret = der_get_heim_integer(buf, length, &vali, NULL);
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if (ret)
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errx (1, "der_get_heim_integer: %s",
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error_message (ret));
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ret = der_print_hex_heim_integer(&vali, &p);
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if (ret)
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errx (1, "der_print_hex_heim_integer: %s",
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error_message (ret));
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printf ("BIG NUM integer: length %lu %s\n",
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(unsigned long)length, p);
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free(p);
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}
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break;
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}
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case UT_OctetString : {
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heim_octet_string str;
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size_t i;
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ret = der_get_octet_string (buf, length, &str, NULL);
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if (ret)
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errx (1, "der_get_octet_string: %s", error_message (ret));
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printf ("(length %lu), ", (unsigned long)length);
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if (inner_flag) {
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Der_class c;
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Der_type ty;
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unsigned int ta;
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ret = der_get_tag(str.data, str.length, &c, &ty, &ta, &sz);
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if (ret || sz > str.length ||
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type != CONS || tag != UT_Sequence)
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goto just_an_octet_string;
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printf("{\n");
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loop (str.data, str.length, indent + 2);
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for (i = 0; i < indent; ++i)
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printf (" ");
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printf ("}\n");
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} else {
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unsigned char *uc;
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just_an_octet_string:
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uc = (unsigned char *)str.data;
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for (i = 0; i < min(16,length); ++i)
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printf ("%02x", uc[i]);
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printf ("\n");
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}
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free (str.data);
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break;
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}
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case UT_IA5String :
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case UT_PrintableString : {
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heim_printable_string str;
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unsigned char *s;
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size_t n;
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memset(&str, 0, sizeof(str));
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ret = der_get_printable_string (buf, length, &str, NULL);
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if (ret)
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errx (1, "der_get_general_string: %s",
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error_message (ret));
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s = str.data;
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printf("\"");
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for (n = 0; n < str.length; n++) {
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if (isprint((int)s[n]))
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printf ("%c", s[n]);
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else
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printf ("#%02x", s[n]);
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}
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printf("\"\n");
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der_free_printable_string(&str);
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break;
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}
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case UT_GeneralizedTime :
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case UT_GeneralString :
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case UT_VisibleString :
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case UT_UTF8String : {
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heim_general_string str;
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ret = der_get_general_string (buf, length, &str, NULL);
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if (ret)
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errx (1, "der_get_general_string: %s",
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error_message (ret));
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printf ("\"%s\"\n", str);
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free (str);
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break;
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}
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case UT_OID: {
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heim_oid o;
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char *p;
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ret = der_get_oid(buf, length, &o, NULL);
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if (ret)
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errx (1, "der_get_oid: %s", error_message (ret));
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ret = der_print_heim_oid(&o, '.', &p);
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der_free_oid(&o);
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if (ret)
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errx (1, "der_print_heim_oid: %s", error_message (ret));
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printf("%s\n", p);
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free(p);
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break;
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}
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case UT_Enumerated: {
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int num;
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ret = der_get_integer (buf, length, &num, NULL);
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if (ret)
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errx (1, "der_get_enum: %s", error_message (ret));
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printf("%u\n", num);
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break;
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}
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default :
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printf ("%lu bytes\n", (unsigned long)length);
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break;
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}
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}
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if (end_tag) {
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if (loop_length == 0)
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errx(1, "zero length INDEFINITE data ? indent = %d\n",
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indent / 2);
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if (loop_length < length)
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length = loop_length;
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if (indefinite_form_loop == 0)
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errx(1, "internal error in indefinite form loop detection");
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indefinite_form_loop--;
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} else if (loop_length)
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errx(1, "internal error for INDEFINITE form");
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buf += length;
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len -= length;
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}
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return 0;
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}
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static int
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doit (const char *filename)
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{
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int fd = open (filename, O_RDONLY);
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struct stat sb;
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unsigned char *buf;
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size_t len;
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int ret;
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if(fd < 0)
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err (1, "opening %s for read", filename);
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if (fstat (fd, &sb) < 0)
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err (1, "stat %s", filename);
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len = sb.st_size;
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buf = emalloc (len);
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if (read (fd, buf, len) != len)
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errx (1, "read failed");
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close (fd);
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ret = loop (buf, len, 0);
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free (buf);
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return ret;
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}
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static int version_flag;
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static int help_flag;
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struct getargs args[] = {
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{ "indent", 0, arg_negative_flag, &indent_flag, NULL, NULL },
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{ "inner", 0, arg_flag, &inner_flag,
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"try to parse inner structures of OCTET STRING", NULL },
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{ "version", 0, arg_flag, &version_flag, NULL, NULL },
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{ "help", 0, arg_flag, &help_flag, NULL, NULL }
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};
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int num_args = sizeof(args) / sizeof(args[0]);
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static void
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usage(int code)
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{
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arg_printusage(args, num_args, NULL, "dump-file");
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exit(code);
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}
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int
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main(int argc, char **argv)
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{
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int optidx = 0;
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setprogname (argv[0]);
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initialize_asn1_error_table ();
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if(getarg(args, num_args, argc, argv, &optidx))
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usage(1);
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if(help_flag)
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usage(0);
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if(version_flag) {
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print_version(NULL);
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exit(0);
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}
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argv += optidx;
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argc -= optidx;
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if (argc != 1)
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usage (1);
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return doit (argv[0]);
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}
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