2 * Copyright 1995-2021 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;
32 if (constructed & V_ASN1_CONSTRUCTED)
36 if (constructed != (V_ASN1_CONSTRUCTED | 1)) {
37 if (BIO_snprintf(str, sizeof(str), "%5ld:d=%-2d hl=%ld l=%4ld %s",
38 offset, depth, (long)hl, len, p) <= 0)
41 if (BIO_snprintf(str, sizeof(str), "%5ld:d=%-2d hl=%ld l=inf %s",
42 offset, depth, (long)hl, p) <= 0)
46 if (BIO_set_prefix(bp, str) <= 0) {
47 if ((bio = BIO_new(BIO_f_prefix())) == NULL
48 || (bp = BIO_push(bio, bp)) == NULL)
52 saved_indent = BIO_get_indent(bp);
53 if (BIO_set_prefix(bp, str) <= 0 || BIO_set_indent(bp, indent) <= 0)
58 * BIO_set_prefix made a copy of |str|, so we can safely use it for
59 * something else, ASN.1 tag printout.
62 if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE)
63 BIO_snprintf(str, sizeof(str), "priv [ %d ] ", tag);
64 else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC)
65 BIO_snprintf(str, sizeof(str), "cont [ %d ]", tag);
66 else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION)
67 BIO_snprintf(str, sizeof(str), "appl [ %d ]", tag);
69 BIO_snprintf(str, sizeof(str), "<ASN1 %d>", tag);
71 p = ASN1_tag2str(tag);
73 i = (BIO_printf(bp, "%-18s", p) > 0);
75 if (saved_indent >= 0)
76 BIO_set_indent(bp, saved_indent);
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 BIO_puts(bp, "Error in encoding\n");
126 * if j == 0x21 it is a constructed indefinite length object
128 if (!asn1_print_info(bp, (long)offset + (long)(op - *pp), depth,
129 hl, len, tag, xclass, j, (indent) ? depth : 0))
131 if (j & V_ASN1_CONSTRUCTED) {
132 const unsigned char *sp = p;
135 if (BIO_write(bp, "\n", 1) <= 0)
138 BIO_printf(bp, "length is greater than %ld\n", length);
141 if ((j == 0x21) && (len == 0)) {
143 r = asn1_parse2(bp, &p, (long)(tot - p),
144 offset + (p - *pp), depth + 1,
148 if ((r == 2) || (p >= tot)) {
158 r = asn1_parse2(bp, &p, tmp,
159 offset + (p - *pp), depth + 1,
166 } else if (xclass != 0) {
168 if (BIO_write(bp, "\n", 1) <= 0)
172 if ((tag == V_ASN1_PRINTABLESTRING) ||
173 (tag == V_ASN1_T61STRING) ||
174 (tag == V_ASN1_IA5STRING) ||
175 (tag == V_ASN1_VISIBLESTRING) ||
176 (tag == V_ASN1_NUMERICSTRING) ||
177 (tag == V_ASN1_UTF8STRING) ||
178 (tag == V_ASN1_UTCTIME) || (tag == V_ASN1_GENERALIZEDTIME)) {
179 if (BIO_write(bp, ":", 1) <= 0)
181 if ((len > 0) && BIO_write(bp, (const char *)p, (int)len)
184 } else if (tag == V_ASN1_OBJECT) {
186 if (d2i_ASN1_OBJECT(&o, &opp, len + hl) != NULL) {
187 if (BIO_write(bp, ":", 1) <= 0)
189 i2a_ASN1_OBJECT(bp, o);
191 if (BIO_puts(bp, ":BAD OBJECT") <= 0)
195 } else if (tag == V_ASN1_BOOLEAN) {
197 if (BIO_puts(bp, ":BAD BOOLEAN") <= 0)
202 BIO_printf(bp, ":%u", p[0]);
203 } else if (tag == V_ASN1_BMPSTRING) {
204 /* do the BMP thang */
205 } else if (tag == V_ASN1_OCTET_STRING) {
206 int i, printable = 1;
209 os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl);
210 if (os != NULL && os->length > 0) {
213 * testing whether the octet string is printable
215 for (i = 0; i < os->length; i++) {
216 if (((opp[i] < ' ') &&
219 (opp[i] != '\t')) || (opp[i] > '~')) {
225 /* printable string */
227 if (BIO_write(bp, ":", 1) <= 0)
229 if (BIO_write(bp, (const char *)opp, os->length) <= 0)
233 * not printable => print octet string as hex dump
236 if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0)
238 for (i = 0; i < os->length; i++) {
239 if (BIO_printf(bp, "%02X", opp[i]) <= 0)
243 /* print the normal dump */
246 if (BIO_write(bp, "\n", 1) <= 0)
249 if (BIO_dump_indent(bp,
251 ((dump == -1 || dump >
253 length) ? os->length : dump),
259 ASN1_OCTET_STRING_free(os);
261 } else if (tag == V_ASN1_INTEGER) {
265 ai = d2i_ASN1_INTEGER(NULL, &opp, len + hl);
267 if (BIO_write(bp, ":", 1) <= 0)
269 if (ai->type == V_ASN1_NEG_INTEGER)
270 if (BIO_write(bp, "-", 1) <= 0)
272 for (i = 0; i < ai->length; i++) {
273 if (BIO_printf(bp, "%02X", ai->data[i]) <= 0)
276 if (ai->length == 0) {
277 if (BIO_write(bp, "00", 2) <= 0)
281 if (BIO_puts(bp, ":BAD INTEGER") <= 0)
285 ASN1_INTEGER_free(ai);
287 } else if (tag == V_ASN1_ENUMERATED) {
291 ae = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl);
293 if (BIO_write(bp, ":", 1) <= 0)
295 if (ae->type == V_ASN1_NEG_ENUMERATED)
296 if (BIO_write(bp, "-", 1) <= 0)
298 for (i = 0; i < ae->length; i++) {
299 if (BIO_printf(bp, "%02X", ae->data[i]) <= 0)
302 if (ae->length == 0) {
303 if (BIO_write(bp, "00", 2) <= 0)
307 if (BIO_puts(bp, ":BAD ENUMERATED") <= 0)
311 ASN1_ENUMERATED_free(ae);
313 } else if (len > 0 && dump) {
315 if (BIO_write(bp, "\n", 1) <= 0)
318 if (BIO_dump_indent(bp, (const char *)p,
319 ((dump == -1 || dump > len) ? len : dump),
326 const unsigned char *tmp = op + hl;
327 if (BIO_puts(bp, ":[") <= 0)
329 for (i = 0; i < len; i++) {
330 if (BIO_printf(bp, "%02X", tmp[i]) <= 0)
333 if (BIO_puts(bp, "]") <= 0)
339 if (BIO_write(bp, "\n", 1) <= 0)
343 if ((tag == V_ASN1_EOC) && (xclass == 0)) {
344 ret = 2; /* End of sequence */
353 ASN1_OCTET_STRING_free(os);
354 ASN1_INTEGER_free(ai);
355 ASN1_ENUMERATED_free(ae);
360 const char *ASN1_tag2str(int tag)
362 static const char *const tag2str[] = {
364 "EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING",
366 "NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL",
368 "ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>",
370 "<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET",
372 "NUMERICSTRING", "PRINTABLESTRING", "T61STRING",
374 "VIDEOTEXSTRING", "IA5STRING", "UTCTIME", "GENERALIZEDTIME",
376 "GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING",
378 "UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING"
381 if ((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED))
384 if (tag < 0 || tag > 30)