| 1 | /*
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| 2 | * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include <openssl/buffer.h>
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| 13 | #include <openssl/objects.h>
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| 14 | #include <openssl/asn1.h>
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| 15 |
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| 16 | #ifndef ASN1_PARSE_MAXDEPTH
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| 17 | #define ASN1_PARSE_MAXDEPTH 128
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| 18 | #endif
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| 19 |
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| 20 | static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
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| 21 | int offset, int depth, int indent, int dump);
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| 22 | static int asn1_print_info(BIO *bp, long offset, int depth, int hl, long len,
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| 23 | int tag, int xclass, int constructed, int indent)
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| 24 | {
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| 25 | char str[128];
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| 26 | const char *p;
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| 27 | int pop_f_prefix = 0;
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| 28 | long saved_indent = -1;
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| 29 | int i = 0;
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| 30 | BIO *bio = NULL;
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| 31 |
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| 32 | if (constructed & V_ASN1_CONSTRUCTED)
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| 33 | p = "cons: ";
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| 34 | else
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| 35 | p = "prim: ";
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| 36 | if (constructed != (V_ASN1_CONSTRUCTED | 1)) {
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| 37 | if (BIO_snprintf(str, sizeof(str), "%5ld:d=%-2d hl=%ld l=%4ld %s",
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| 38 | offset, depth, (long)hl, len, p) <= 0)
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| 39 | goto err;
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| 40 | } else {
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| 41 | if (BIO_snprintf(str, sizeof(str), "%5ld:d=%-2d hl=%ld l=inf %s",
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| 42 | offset, depth, (long)hl, p) <= 0)
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| 43 | goto err;
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| 44 | }
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| 45 | if (bp != NULL) {
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| 46 | if (BIO_set_prefix(bp, str) <= 0) {
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| 47 | if ((bio = BIO_new(BIO_f_prefix())) == NULL
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| 48 | || (bp = BIO_push(bio, bp)) == NULL)
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| 49 | goto err;
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| 50 | pop_f_prefix = 1;
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| 51 | }
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| 52 | saved_indent = BIO_get_indent(bp);
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| 53 | if (BIO_set_prefix(bp, str) <= 0 || BIO_set_indent(bp, indent) < 0)
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| 54 | goto err;
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| 55 | }
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| 56 |
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| 57 | /*
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| 58 | * BIO_set_prefix made a copy of |str|, so we can safely use it for
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| 59 | * something else, ASN.1 tag printout.
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| 60 | */
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| 61 | p = str;
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| 62 | if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE)
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| 63 | BIO_snprintf(str, sizeof(str), "priv [ %d ] ", tag);
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| 64 | else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC)
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| 65 | BIO_snprintf(str, sizeof(str), "cont [ %d ]", tag);
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| 66 | else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION)
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| 67 | BIO_snprintf(str, sizeof(str), "appl [ %d ]", tag);
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| 68 | else if (tag > 30)
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| 69 | BIO_snprintf(str, sizeof(str), "<ASN1 %d>", tag);
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| 70 | else
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| 71 | p = ASN1_tag2str(tag);
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| 72 |
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| 73 | i = (BIO_printf(bp, "%-18s", p) > 0);
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| 74 | err:
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| 75 | if (saved_indent >= 0)
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| 76 | BIO_set_indent(bp, saved_indent);
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| 77 | if (pop_f_prefix)
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| 78 | BIO_pop(bp);
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| 79 | BIO_free(bio);
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| 80 | return i;
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| 81 | }
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| 82 |
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| 83 | int ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent)
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| 84 | {
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| 85 | return asn1_parse2(bp, &pp, len, 0, 0, indent, 0);
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| 86 | }
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| 87 |
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| 88 | int ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent,
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| 89 | int dump)
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| 90 | {
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| 91 | return asn1_parse2(bp, &pp, len, 0, 0, indent, dump);
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| 92 | }
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| 93 |
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| 94 | static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
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| 95 | int offset, int depth, int indent, int dump)
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| 96 | {
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| 97 | const unsigned char *p, *ep, *tot, *op, *opp;
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| 98 | long len;
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| 99 | int tag, xclass, ret = 0;
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| 100 | int nl, hl, j, r;
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| 101 | ASN1_OBJECT *o = NULL;
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| 102 | ASN1_OCTET_STRING *os = NULL;
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| 103 | ASN1_INTEGER *ai = NULL;
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| 104 | ASN1_ENUMERATED *ae = NULL;
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| 105 | /* ASN1_BMPSTRING *bmp=NULL; */
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| 106 | int dump_indent, dump_cont = 0;
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| 107 |
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| 108 | if (depth > ASN1_PARSE_MAXDEPTH) {
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| 109 | BIO_puts(bp, "BAD RECURSION DEPTH\n");
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| 110 | return 0;
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| 111 | }
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| 112 |
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| 113 | dump_indent = 6; /* Because we know BIO_dump_indent() */
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| 114 | p = *pp;
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| 115 | tot = p + length;
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| 116 | while (length > 0) {
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| 117 | op = p;
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| 118 | j = ASN1_get_object(&p, &len, &tag, &xclass, length);
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| 119 | if (j & 0x80) {
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| 120 | BIO_puts(bp, "Error in encoding\n");
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| 121 | goto end;
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| 122 | }
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| 123 | hl = (p - op);
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| 124 | length -= hl;
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| 125 | /*
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| 126 | * if j == 0x21 it is a constructed indefinite length object
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| 127 | */
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| 128 | if (!asn1_print_info(bp, (long)offset + (long)(op - *pp), depth,
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| 129 | hl, len, tag, xclass, j, (indent) ? depth : 0))
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| 130 | goto end;
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| 131 | if (j & V_ASN1_CONSTRUCTED) {
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| 132 | const unsigned char *sp = p;
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| 133 |
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| 134 | ep = p + len;
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| 135 | if (BIO_write(bp, "\n", 1) <= 0)
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| 136 | goto end;
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| 137 | if (len > length) {
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| 138 | BIO_printf(bp, "length is greater than %ld\n", length);
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| 139 | goto end;
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| 140 | }
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| 141 | if ((j == 0x21) && (len == 0)) {
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| 142 | for (;;) {
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| 143 | r = asn1_parse2(bp, &p, (long)(tot - p),
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| 144 | offset + (p - *pp), depth + 1,
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| 145 | indent, dump);
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| 146 | if (r == 0)
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| 147 | goto end;
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| 148 | if ((r == 2) || (p >= tot)) {
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| 149 | len = p - sp;
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| 150 | break;
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| 151 | }
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| 152 | }
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| 153 | } else {
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| 154 | long tmp = len;
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| 155 |
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| 156 | while (p < ep) {
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| 157 | sp = p;
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| 158 | r = asn1_parse2(bp, &p, tmp,
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| 159 | offset + (p - *pp), depth + 1,
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| 160 | indent, dump);
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| 161 | if (r == 0)
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| 162 | goto end;
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| 163 | tmp -= p - sp;
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| 164 | }
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| 165 | }
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| 166 | } else if (xclass != 0) {
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| 167 | p += len;
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| 168 | if (BIO_write(bp, "\n", 1) <= 0)
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| 169 | goto end;
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| 170 | } else {
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| 171 | nl = 0;
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| 172 | if ((tag == V_ASN1_PRINTABLESTRING) ||
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| 173 | (tag == V_ASN1_T61STRING) ||
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| 174 | (tag == V_ASN1_IA5STRING) ||
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| 175 | (tag == V_ASN1_VISIBLESTRING) ||
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| 176 | (tag == V_ASN1_NUMERICSTRING) ||
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| 177 | (tag == V_ASN1_UTF8STRING) ||
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| 178 | (tag == V_ASN1_UTCTIME) || (tag == V_ASN1_GENERALIZEDTIME)) {
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| 179 | if (BIO_write(bp, ":", 1) <= 0)
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| 180 | goto end;
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| 181 | if ((len > 0) && BIO_write(bp, (const char *)p, (int)len)
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| 182 | != (int)len)
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| 183 | goto end;
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| 184 | } else if (tag == V_ASN1_OBJECT) {
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| 185 | opp = op;
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| 186 | if (d2i_ASN1_OBJECT(&o, &opp, len + hl) != NULL) {
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| 187 | if (BIO_write(bp, ":", 1) <= 0)
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| 188 | goto end;
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| 189 | i2a_ASN1_OBJECT(bp, o);
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| 190 | } else {
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| 191 | if (BIO_puts(bp, ":BAD OBJECT") <= 0)
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| 192 | goto end;
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| 193 | dump_cont = 1;
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| 194 | }
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| 195 | } else if (tag == V_ASN1_BOOLEAN) {
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| 196 | if (len != 1) {
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| 197 | if (BIO_puts(bp, ":BAD BOOLEAN") <= 0)
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| 198 | goto end;
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| 199 | dump_cont = 1;
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| 200 | }
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| 201 | if (len > 0)
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| 202 | BIO_printf(bp, ":%u", p[0]);
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| 203 | } else if (tag == V_ASN1_BMPSTRING) {
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| 204 | /* do the BMP thang */
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| 205 | } else if (tag == V_ASN1_OCTET_STRING) {
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| 206 | int i, printable = 1;
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| 207 |
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| 208 | opp = op;
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| 209 | os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl);
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| 210 | if (os != NULL && os->length > 0) {
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| 211 | opp = os->data;
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| 212 | /*
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| 213 | * testing whether the octet string is printable
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| 214 | */
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| 215 | for (i = 0; i < os->length; i++) {
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| 216 | if (((opp[i] < ' ') &&
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| 217 | (opp[i] != '\n') &&
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| 218 | (opp[i] != '\r') &&
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| 219 | (opp[i] != '\t')) || (opp[i] > '~')) {
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| 220 | printable = 0;
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| 221 | break;
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| 222 | }
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| 223 | }
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| 224 | if (printable)
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| 225 | /* printable string */
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| 226 | {
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| 227 | if (BIO_write(bp, ":", 1) <= 0)
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| 228 | goto end;
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| 229 | if (BIO_write(bp, (const char *)opp, os->length) <= 0)
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| 230 | goto end;
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| 231 | } else if (!dump)
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| 232 | /*
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| 233 | * not printable => print octet string as hex dump
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| 234 | */
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| 235 | {
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| 236 | if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0)
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| 237 | goto end;
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| 238 | for (i = 0; i < os->length; i++) {
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| 239 | if (BIO_printf(bp, "%02X", opp[i]) <= 0)
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| 240 | goto end;
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| 241 | }
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| 242 | } else
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| 243 | /* print the normal dump */
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| 244 | {
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| 245 | if (!nl) {
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| 246 | if (BIO_write(bp, "\n", 1) <= 0)
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| 247 | goto end;
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| 248 | }
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| 249 | if (BIO_dump_indent(bp,
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| 250 | (const char *)opp,
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| 251 | ((dump == -1 || dump >
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| 252 | os->
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| 253 | length) ? os->length : dump),
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| 254 | dump_indent) <= 0)
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| 255 | goto end;
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| 256 | nl = 1;
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| 257 | }
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| 258 | }
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| 259 | ASN1_OCTET_STRING_free(os);
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| 260 | os = NULL;
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| 261 | } else if (tag == V_ASN1_INTEGER) {
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| 262 | int i;
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| 263 |
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| 264 | opp = op;
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| 265 | ai = d2i_ASN1_INTEGER(NULL, &opp, len + hl);
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| 266 | if (ai != NULL) {
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| 267 | if (BIO_write(bp, ":", 1) <= 0)
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| 268 | goto end;
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| 269 | if (ai->type == V_ASN1_NEG_INTEGER)
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| 270 | if (BIO_write(bp, "-", 1) <= 0)
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| 271 | goto end;
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| 272 | for (i = 0; i < ai->length; i++) {
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| 273 | if (BIO_printf(bp, "%02X", ai->data[i]) <= 0)
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| 274 | goto end;
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| 275 | }
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| 276 | if (ai->length == 0) {
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| 277 | if (BIO_write(bp, "00", 2) <= 0)
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| 278 | goto end;
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| 279 | }
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| 280 | } else {
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| 281 | if (BIO_puts(bp, ":BAD INTEGER") <= 0)
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| 282 | goto end;
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| 283 | dump_cont = 1;
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| 284 | }
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| 285 | ASN1_INTEGER_free(ai);
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| 286 | ai = NULL;
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| 287 | } else if (tag == V_ASN1_ENUMERATED) {
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| 288 | int i;
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| 289 |
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| 290 | opp = op;
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| 291 | ae = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl);
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| 292 | if (ae != NULL) {
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| 293 | if (BIO_write(bp, ":", 1) <= 0)
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| 294 | goto end;
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| 295 | if (ae->type == V_ASN1_NEG_ENUMERATED)
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| 296 | if (BIO_write(bp, "-", 1) <= 0)
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| 297 | goto end;
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| 298 | for (i = 0; i < ae->length; i++) {
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| 299 | if (BIO_printf(bp, "%02X", ae->data[i]) <= 0)
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| 300 | goto end;
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| 301 | }
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| 302 | if (ae->length == 0) {
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| 303 | if (BIO_write(bp, "00", 2) <= 0)
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| 304 | goto end;
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| 305 | }
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| 306 | } else {
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| 307 | if (BIO_puts(bp, ":BAD ENUMERATED") <= 0)
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| 308 | goto end;
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| 309 | dump_cont = 1;
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| 310 | }
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| 311 | ASN1_ENUMERATED_free(ae);
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| 312 | ae = NULL;
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| 313 | } else if (len > 0 && dump) {
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| 314 | if (!nl) {
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| 315 | if (BIO_write(bp, "\n", 1) <= 0)
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| 316 | goto end;
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| 317 | }
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| 318 | if (BIO_dump_indent(bp, (const char *)p,
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| 319 | ((dump == -1 || dump > len) ? len : dump),
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| 320 | dump_indent) <= 0)
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| 321 | goto end;
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| 322 | nl = 1;
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| 323 | }
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| 324 | if (dump_cont) {
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| 325 | int i;
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| 326 | const unsigned char *tmp = op + hl;
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| 327 | if (BIO_puts(bp, ":[") <= 0)
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| 328 | goto end;
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| 329 | for (i = 0; i < len; i++) {
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| 330 | if (BIO_printf(bp, "%02X", tmp[i]) <= 0)
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| 331 | goto end;
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| 332 | }
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| 333 | if (BIO_puts(bp, "]") <= 0)
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| 334 | goto end;
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| 335 | dump_cont = 0;
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| 336 | }
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| 337 |
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| 338 | if (!nl) {
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| 339 | if (BIO_write(bp, "\n", 1) <= 0)
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| 340 | goto end;
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| 341 | }
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| 342 | p += len;
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| 343 | if ((tag == V_ASN1_EOC) && (xclass == 0)) {
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| 344 | ret = 2; /* End of sequence */
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| 345 | goto end;
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| 346 | }
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| 347 | }
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| 348 | length -= len;
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| 349 | }
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| 350 | ret = 1;
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| 351 | end:
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| 352 | ASN1_OBJECT_free(o);
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| 353 | ASN1_OCTET_STRING_free(os);
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| 354 | ASN1_INTEGER_free(ai);
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| 355 | ASN1_ENUMERATED_free(ae);
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| 356 | *pp = p;
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| 357 | return ret;
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| 358 | }
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| 359 |
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| 360 | const char *ASN1_tag2str(int tag)
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| 361 | {
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| 362 | static const char *const tag2str[] = {
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| 363 | /* 0-4 */
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| 364 | "EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING",
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| 365 | /* 5-9 */
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| 366 | "NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL",
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| 367 | /* 10-13 */
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| 368 | "ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>",
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| 369 | /* 15-17 */
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| 370 | "<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET",
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| 371 | /* 18-20 */
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| 372 | "NUMERICSTRING", "PRINTABLESTRING", "T61STRING",
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| 373 | /* 21-24 */
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| 374 | "VIDEOTEXSTRING", "IA5STRING", "UTCTIME", "GENERALIZEDTIME",
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| 375 | /* 25-27 */
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| 376 | "GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING",
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| 377 | /* 28-30 */
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| 378 | "UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING"
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| 379 | };
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| 380 |
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| 381 | if ((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED))
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| 382 | tag &= ~0x100;
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|---|
| 383 |
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| 384 | if (tag < 0 || tag > 30)
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|---|
| 385 | return "(unknown)";
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| 386 | return tag2str[tag];
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| 387 | }
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