mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-11-11 01:55:38 +08:00
360 lines
11 KiB
C
360 lines
11 KiB
C
//-----------------------------------------------------------------------------
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// Copyright (C) 2018 Merlok
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// asn.1 dumping
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//-----------------------------------------------------------------------------
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#define _POSIX_C_SOURCE 200809L // need for strnlen()
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#include "asn1dump.h"
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#include <ctype.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include <jansson.h>
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#include <mbedtls/asn1.h>
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#include <mbedtls/oid.h>
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#include "emv/emv_tags.h"
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#include "emv/dump.h"
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#include "emv/emvjson.h"
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#include "util.h"
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#include "proxmark3.h"
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#ifndef PRINT_INDENT
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# define PRINT_INDENT(level) {for (int myi = 0; myi < (level); myi++) fprintf(f, " ");}
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#endif
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enum asn1_tag_t {
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ASN1_TAG_GENERIC,
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ASN1_TAG_BOOLEAN,
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ASN1_TAG_INTEGER,
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ASN1_TAG_STRING,
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ASN1_TAG_OCTET_STRING,
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ASN1_TAG_UTC_TIME,
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ASN1_TAG_STR_TIME,
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ASN1_TAG_OBJECT_ID,
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};
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struct asn1_tag {
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tlv_tag_t tag;
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const char *name;
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enum asn1_tag_t type;
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// const void *data;
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};
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static const struct asn1_tag asn1_tags[] = {
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// internal
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{ 0x00, "Unknown ???", ASN1_TAG_GENERIC },
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// ASN.1
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{ 0x01, "BOOLEAN", ASN1_TAG_BOOLEAN },
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{ 0x02, "INTEGER", ASN1_TAG_INTEGER },
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{ 0x03, "BIT STRING", ASN1_TAG_GENERIC },
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{ 0x04, "OCTET STRING", ASN1_TAG_OCTET_STRING },
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{ 0x05, "NULL", ASN1_TAG_GENERIC },
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{ 0x06, "OBJECT IDENTIFIER", ASN1_TAG_OBJECT_ID },
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{ 0x07, "OBJECT DESCRIPTOR", ASN1_TAG_GENERIC },
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{ 0x08, "EXTERNAL", ASN1_TAG_GENERIC },
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{ 0x09, "REAL", ASN1_TAG_GENERIC },
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{ 0x0A, "ENUMERATED", ASN1_TAG_GENERIC },
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{ 0x0B, "EMBEDDED_PDV", ASN1_TAG_GENERIC },
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{ 0x0C, "UTF8String", ASN1_TAG_STRING },
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{ 0x10, "SEQUENCE", ASN1_TAG_GENERIC },
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{ 0x11, "SET", ASN1_TAG_GENERIC },
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{ 0x12, "NumericString", ASN1_TAG_STRING },
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{ 0x13, "PrintableString", ASN1_TAG_STRING },
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{ 0x14, "T61String", ASN1_TAG_GENERIC },
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{ 0x15, "VideotexString", ASN1_TAG_GENERIC },
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{ 0x16, "IA5String", ASN1_TAG_GENERIC },
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{ 0x17, "UTCTime", ASN1_TAG_UTC_TIME },
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{ 0x18, "GeneralizedTime", ASN1_TAG_STR_TIME },
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{ 0x19, "GraphicString", ASN1_TAG_GENERIC },
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{ 0x1A, "VisibleString", ASN1_TAG_STRING },
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{ 0x1B, "GeneralString", ASN1_TAG_STRING },
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{ 0x1C, "UniversalString", ASN1_TAG_STRING },
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{ 0x1E, "BMPString", ASN1_TAG_GENERIC },
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{ 0x30, "SEQUENCE", ASN1_TAG_GENERIC },
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{ 0x31, "SET", ASN1_TAG_GENERIC },
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{ 0xa0, "[0]", ASN1_TAG_GENERIC },
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{ 0xa1, "[1]", ASN1_TAG_GENERIC },
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{ 0xa2, "[2]", ASN1_TAG_GENERIC },
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{ 0xa3, "[3]", ASN1_TAG_GENERIC },
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{ 0xa4, "[4]", ASN1_TAG_GENERIC },
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{ 0xa5, "[5]", ASN1_TAG_GENERIC },
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};
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static int asn1_sort_tag(tlv_tag_t tag) {
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return (int)(tag >= 0x100 ? tag : tag << 8);
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}
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static int asn1_tlv_compare(const void *a, const void *b) {
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const struct tlv *tlv = a;
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const struct asn1_tag *tag = b;
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return asn1_sort_tag(tlv->tag) - (asn1_sort_tag(tag->tag));
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}
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static const struct asn1_tag *asn1_get_tag(const struct tlv *tlv) {
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struct asn1_tag *tag = bsearch(tlv, asn1_tags, sizeof(asn1_tags) / sizeof(asn1_tags[0]),
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sizeof(asn1_tags[0]), asn1_tlv_compare);
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return tag ? tag : &asn1_tags[0];
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}
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static void asn1_tag_dump_str_time(const struct tlv *tlv, const struct asn1_tag *tag, FILE *f, int level, bool longyear, bool *needdump) {
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int len = tlv->len;
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*needdump = false;
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int startindx = longyear ? 4 : 2;
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if (len > 4) {
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fprintf(f, "\tvalue: '");
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while (true) {
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// year
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if (!longyear)
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fprintf(f, "20");
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fwrite(tlv->value, 1, longyear ? 4 : 2, f);
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fprintf(f, "-");
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if (len < startindx + 2)
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break;
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// month
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fwrite(&tlv->value[startindx], 1, 2, f);
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fprintf(f, "-");
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if (len < startindx + 4)
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break;
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// day
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fwrite(&tlv->value[startindx + 2], 1, 2, f);
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fprintf(f, " ");
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if (len < startindx + 6)
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break;
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// hour
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fwrite(&tlv->value[startindx + 4], 1, 2, f);
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fprintf(f, ":");
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if (len < startindx + 8)
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break;
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// min
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fwrite(&tlv->value[startindx + 6], 1, 2, f);
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fprintf(f, ":");
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if (len < startindx + 10)
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break;
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// sec
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fwrite(&tlv->value[startindx + 8], 1, 2, f);
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if (len < startindx + 11)
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break;
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// time zone
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fprintf(f, " zone: %.*s", len - 10 - (longyear ? 4 : 2), &tlv->value[startindx + 10]);
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break;
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}
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fprintf(f, "'\n");
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} else {
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fprintf(f, "\n");
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*needdump = true;
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}
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}
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static void asn1_tag_dump_string(const struct tlv *tlv, const struct asn1_tag *tag, FILE *f, int level) {
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fprintf(f, "\tvalue: '");
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fwrite(tlv->value, 1, tlv->len, f);
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fprintf(f, "'\n");
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}
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static void asn1_tag_dump_octet_string(const struct tlv *tlv, const struct asn1_tag *tag, FILE *f, int level, bool *needdump) {
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*needdump = false;
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for (int i = 0; i < tlv->len; i++)
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if (!isspace(tlv->value[i]) && !isprint(tlv->value[i])) {
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*needdump = true;
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break;
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}
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if (*needdump) {
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fprintf(f, "'\n");
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} else {
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fprintf(f, "\t\t");
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asn1_tag_dump_string(tlv, tag, f, level);
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}
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}
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static unsigned long asn1_value_integer(const struct tlv *tlv, unsigned start, unsigned end) {
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unsigned long ret = 0;
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int i;
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if (end > tlv->len * 2)
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return ret;
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if (start >= end)
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return ret;
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if (start & 1) {
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ret += tlv->value[start / 2] & 0xf;
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i = start + 1;
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} else
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i = start;
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for (; i < end - 1; i += 2) {
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ret *= 10;
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ret += tlv->value[i / 2] >> 4;
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ret *= 10;
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ret += tlv->value[i / 2] & 0xf;
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}
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if (end & 1) {
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ret *= 10;
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ret += tlv->value[end / 2] >> 4;
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}
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return ret;
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}
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static void asn1_tag_dump_boolean(const struct tlv *tlv, const struct asn1_tag *tag, FILE *f, int level) {
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PRINT_INDENT(level);
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if (tlv->len > 0) {
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fprintf(f, "\tvalue: %s\n", tlv->value[0] ? "true" : "false");
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} else {
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fprintf(f, "n/a\n");
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}
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}
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static void asn1_tag_dump_integer(const struct tlv *tlv, const struct asn1_tag *tag, FILE *f, int level) {
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PRINT_INDENT(level);
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if (tlv->len == 4) {
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int32_t val = 0;
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for (int i = 0; i < tlv->len; i++)
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val = (val << 8) + tlv->value[i];
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fprintf(f, "\tvalue4b: %d\n", val);
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return;
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}
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fprintf(f, "\tvalue: %lu\n", asn1_value_integer(tlv, 0, tlv->len * 2));
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}
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static char *asn1_oid_description(const char *oid, bool with_group_desc) {
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json_error_t error;
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json_t *root = NULL;
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char fname[300] = {0};
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static char res[300];
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memset(res, 0x00, sizeof(res));
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size_t len = strlen(get_my_executable_directory());
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if (len >= 300) len = 299;
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strncpy(fname, get_my_executable_directory(), len);
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strcat(fname, "crypto/oids.json");
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if (access(fname, F_OK) < 0) {
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strncpy(fname, get_my_executable_directory(), len);
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strcat(fname, "oids.json");
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if (access(fname, F_OK) < 0) {
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goto error; // file not found
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}
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}
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// load `oids.json`
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root = json_load_file(fname, 0, &error);
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if (!root || !json_is_object(root)) {
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goto error;
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}
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json_t *elm = json_object_get(root, oid);
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if (!elm) {
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goto error;
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}
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if (JsonLoadStr(elm, "$.d", res))
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goto error;
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char strext[300] = {0};
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if (!JsonLoadStr(elm, "$.c", strext)) {
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strcat(res, " (");
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strcat(res, strext);
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strcat(res, ")");
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}
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json_decref(root);
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return res;
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error:
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if (root)
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json_decref(root);
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return NULL;
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}
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static void asn1_tag_dump_object_id(const struct tlv *tlv, const struct asn1_tag *tag, FILE *f, int level) {
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PRINT_INDENT(level);
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mbedtls_asn1_buf asn1_buf;
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asn1_buf.len = tlv->len;
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asn1_buf.p = (uint8_t *)tlv->value;
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char pstr[300];
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mbedtls_oid_get_numeric_string(pstr, sizeof(pstr), &asn1_buf);
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fprintf(f, " %s", pstr);
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char *jsondesc = asn1_oid_description(pstr, true);
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if (jsondesc) {
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fprintf(f, " - %s", jsondesc);
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} else {
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const char *ppstr;
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mbedtls_oid_get_attr_short_name(&asn1_buf, &ppstr);
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if (ppstr && strnlen(ppstr, 1)) {
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fprintf(f, " (%s)\n", ppstr);
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return;
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}
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mbedtls_oid_get_sig_alg_desc(&asn1_buf, &ppstr);
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if (ppstr && strnlen(ppstr, 1)) {
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fprintf(f, " (%s)\n", ppstr);
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return;
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}
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mbedtls_oid_get_extended_key_usage(&asn1_buf, &ppstr);
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if (ppstr && strnlen(ppstr, 1)) {
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fprintf(f, " (%s)\n", ppstr);
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return;
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}
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}
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fprintf(f, "\n");
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}
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bool asn1_tag_dump(const struct tlv *tlv, FILE *f, int level, bool *candump) {
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if (!tlv) {
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fprintf(f, "NULL\n");
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return false;
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}
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const struct asn1_tag *tag = asn1_get_tag(tlv);
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PRINT_INDENT(level);
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fprintf(f, "--%2x[%02zx] '%s':", tlv->tag, tlv->len, tag->name);
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switch (tag->type) {
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case ASN1_TAG_GENERIC:
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fprintf(f, "\n");
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break;
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case ASN1_TAG_STRING:
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asn1_tag_dump_string(tlv, tag, f, level);
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*candump = false;
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break;
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case ASN1_TAG_OCTET_STRING:
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asn1_tag_dump_octet_string(tlv, tag, f, level, candump);
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break;
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case ASN1_TAG_BOOLEAN:
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asn1_tag_dump_boolean(tlv, tag, f, level);
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*candump = false;
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break;
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case ASN1_TAG_INTEGER:
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asn1_tag_dump_integer(tlv, tag, f, level);
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*candump = false;
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break;
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case ASN1_TAG_UTC_TIME:
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asn1_tag_dump_str_time(tlv, tag, f, level, false, candump);
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break;
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case ASN1_TAG_STR_TIME:
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asn1_tag_dump_str_time(tlv, tag, f, level, true, candump);
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break;
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case ASN1_TAG_OBJECT_ID:
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asn1_tag_dump_object_id(tlv, tag, f, level);
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*candump = false;
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break;
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};
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return true;
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}
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