2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 #include "internal/cryptlib.h"
12 #include <openssl/buffer.h>
13 #include <openssl/objects.h>
14 #include <openssl/asn1.h>
16 #ifndef ASN1_PARSE_MAXDEPTH
17 #define ASN1_PARSE_MAXDEPTH 128
20 static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
21 int offset, int depth, int indent, int dump);
22 static int asn1_print_info(BIO *bp, long offset, int depth, int hl, long len,
23 int tag, int xclass, int constructed, int indent)
28 long saved_indent = -1;
31 if (constructed & V_ASN1_CONSTRUCTED)
35 if (constructed != (V_ASN1_CONSTRUCTED | 1)) {
36 if (BIO_snprintf(str, sizeof(str), "%5ld:d=%-2d hl=%ld l=%4ld %s",
37 offset, depth, (long)hl, len, p) <= 0)
40 if (BIO_snprintf(str, sizeof(str), "%5ld:d=%-2d hl=%ld l=inf %s",
41 offset, depth, (long)hl, p) <= 0)
44 if (BIO_set_prefix(bp, str) <= 0) {
45 if ((bp = BIO_push(BIO_new(BIO_f_prefix()), bp)) == NULL)
49 saved_indent = BIO_get_indent(bp);
50 if (BIO_set_prefix(bp, str) <= 0
51 || BIO_set_indent(bp, indent) < 0)
55 * BIO_set_prefix made a copy of |str|, so we can safely use it for
56 * something else, ASN.1 tag printout.
59 if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE)
60 BIO_snprintf(str, sizeof(str), "priv [ %d ] ", tag);
61 else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC)
62 BIO_snprintf(str, sizeof(str), "cont [ %d ]", tag);
63 else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION)
64 BIO_snprintf(str, sizeof(str), "appl [ %d ]", tag);
66 BIO_snprintf(str, sizeof(str), "<ASN1 %d>", tag);
68 p = ASN1_tag2str(tag);
70 i = (BIO_printf(bp, "%-18s", p) > 0);
72 if (saved_indent >= 0)
73 BIO_set_indent(bp, saved_indent);
75 BIO *next = BIO_pop(bp);
83 int ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent)
85 return asn1_parse2(bp, &pp, len, 0, 0, indent, 0);
88 int ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent,
91 return asn1_parse2(bp, &pp, len, 0, 0, indent, dump);
94 static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
95 int offset, int depth, int indent, int dump)
97 const unsigned char *p, *ep, *tot, *op, *opp;
99 int tag, xclass, ret = 0;
101 ASN1_OBJECT *o = NULL;
102 ASN1_OCTET_STRING *os = NULL;
103 ASN1_INTEGER *ai = NULL;
104 ASN1_ENUMERATED *ae = NULL;
105 /* ASN1_BMPSTRING *bmp=NULL; */
106 int dump_indent, dump_cont = 0;
108 if (depth > ASN1_PARSE_MAXDEPTH) {
109 BIO_puts(bp, "BAD RECURSION DEPTH\n");
113 dump_indent = 6; /* Because we know BIO_dump_indent() */
118 j = ASN1_get_object(&p, &len, &tag, &xclass, length);
120 if (BIO_write(bp, "Error in encoding\n", 18) <= 0)
128 * if j == 0x21 it is a constructed indefinite length object
130 if (!asn1_print_info(bp, (long)offset + (long)(op - *pp), depth,
131 hl, len, tag, xclass, j, (indent) ? depth : 0))
133 if (j & V_ASN1_CONSTRUCTED) {
134 const unsigned char *sp = p;
137 if (BIO_write(bp, "\n", 1) <= 0)
140 BIO_printf(bp, "length is greater than %ld\n", length);
144 if ((j == 0x21) && (len == 0)) {
146 r = asn1_parse2(bp, &p, (long)(tot - p),
147 offset + (p - *pp), depth + 1,
153 if ((r == 2) || (p >= tot)) {
163 r = asn1_parse2(bp, &p, tmp,
164 offset + (p - *pp), depth + 1,
173 } else if (xclass != 0) {
175 if (BIO_write(bp, "\n", 1) <= 0)
179 if ((tag == V_ASN1_PRINTABLESTRING) ||
180 (tag == V_ASN1_T61STRING) ||
181 (tag == V_ASN1_IA5STRING) ||
182 (tag == V_ASN1_VISIBLESTRING) ||
183 (tag == V_ASN1_NUMERICSTRING) ||
184 (tag == V_ASN1_UTF8STRING) ||
185 (tag == V_ASN1_UTCTIME) || (tag == V_ASN1_GENERALIZEDTIME)) {
186 if (BIO_write(bp, ":", 1) <= 0)
188 if ((len > 0) && BIO_write(bp, (const char *)p, (int)len)
191 } else if (tag == V_ASN1_OBJECT) {
193 if (d2i_ASN1_OBJECT(&o, &opp, len + hl) != NULL) {
194 if (BIO_write(bp, ":", 1) <= 0)
196 i2a_ASN1_OBJECT(bp, o);
198 if (BIO_puts(bp, ":BAD OBJECT") <= 0)
202 } else if (tag == V_ASN1_BOOLEAN) {
204 if (BIO_puts(bp, ":BAD BOOLEAN") <= 0)
209 BIO_printf(bp, ":%u", p[0]);
210 } else if (tag == V_ASN1_BMPSTRING) {
211 /* do the BMP thang */
212 } else if (tag == V_ASN1_OCTET_STRING) {
213 int i, printable = 1;
216 os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl);
217 if (os != NULL && os->length > 0) {
220 * testing whether the octet string is printable
222 for (i = 0; i < os->length; i++) {
223 if (((opp[i] < ' ') &&
226 (opp[i] != '\t')) || (opp[i] > '~')) {
232 /* printable string */
234 if (BIO_write(bp, ":", 1) <= 0)
236 if (BIO_write(bp, (const char *)opp, os->length) <= 0)
240 * not printable => print octet string as hex dump
243 if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0)
245 for (i = 0; i < os->length; i++) {
246 if (BIO_printf(bp, "%02X", opp[i]) <= 0)
250 /* print the normal dump */
253 if (BIO_write(bp, "\n", 1) <= 0)
256 if (BIO_dump_indent(bp,
258 ((dump == -1 || dump >
260 length) ? os->length : dump),
266 ASN1_OCTET_STRING_free(os);
268 } else if (tag == V_ASN1_INTEGER) {
272 ai = d2i_ASN1_INTEGER(NULL, &opp, len + hl);
274 if (BIO_write(bp, ":", 1) <= 0)
276 if (ai->type == V_ASN1_NEG_INTEGER)
277 if (BIO_write(bp, "-", 1) <= 0)
279 for (i = 0; i < ai->length; i++) {
280 if (BIO_printf(bp, "%02X", ai->data[i]) <= 0)
283 if (ai->length == 0) {
284 if (BIO_write(bp, "00", 2) <= 0)
288 if (BIO_puts(bp, ":BAD INTEGER") <= 0)
292 ASN1_INTEGER_free(ai);
294 } else if (tag == V_ASN1_ENUMERATED) {
298 ae = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl);
300 if (BIO_write(bp, ":", 1) <= 0)
302 if (ae->type == V_ASN1_NEG_ENUMERATED)
303 if (BIO_write(bp, "-", 1) <= 0)
305 for (i = 0; i < ae->length; i++) {
306 if (BIO_printf(bp, "%02X", ae->data[i]) <= 0)
309 if (ae->length == 0) {
310 if (BIO_write(bp, "00", 2) <= 0)
314 if (BIO_puts(bp, ":BAD ENUMERATED") <= 0)
318 ASN1_ENUMERATED_free(ae);
320 } else if (len > 0 && dump) {
322 if (BIO_write(bp, "\n", 1) <= 0)
325 if (BIO_dump_indent(bp, (const char *)p,
326 ((dump == -1 || dump > len) ? len : dump),
333 const unsigned char *tmp = op + hl;
334 if (BIO_puts(bp, ":[") <= 0)
336 for (i = 0; i < len; i++) {
337 if (BIO_printf(bp, "%02X", tmp[i]) <= 0)
340 if (BIO_puts(bp, "]") <= 0)
345 if (BIO_write(bp, "\n", 1) <= 0)
349 if ((tag == V_ASN1_EOC) && (xclass == 0)) {
350 ret = 2; /* End of sequence */
359 ASN1_OCTET_STRING_free(os);
360 ASN1_INTEGER_free(ai);
361 ASN1_ENUMERATED_free(ae);
366 const char *ASN1_tag2str(int tag)
368 static const char *const tag2str[] = {
370 "EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING",
372 "NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL",
374 "ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>",
376 "<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET",
378 "NUMERICSTRING", "PRINTABLESTRING", "T61STRING",
380 "VIDEOTEXSTRING", "IA5STRING", "UTCTIME", "GENERALIZEDTIME",
382 "GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING",
384 "UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING"
387 if ((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED))
390 if (tag < 0 || tag > 30)