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;
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);
81 int ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent)
83 return asn1_parse2(bp, &pp, len, 0, 0, indent, 0);
86 int ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent,
89 return asn1_parse2(bp, &pp, len, 0, 0, indent, dump);
92 static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
93 int offset, int depth, int indent, int dump)
95 const unsigned char *p, *ep, *tot, *op, *opp;
97 int tag, xclass, ret = 0;
99 ASN1_OBJECT *o = NULL;
100 ASN1_OCTET_STRING *os = NULL;
101 ASN1_INTEGER *ai = NULL;
102 ASN1_ENUMERATED *ae = NULL;
103 /* ASN1_BMPSTRING *bmp=NULL; */
104 int dump_indent, dump_cont = 0;
106 if (depth > ASN1_PARSE_MAXDEPTH) {
107 BIO_puts(bp, "BAD RECURSION DEPTH\n");
111 dump_indent = 6; /* Because we know BIO_dump_indent() */
116 j = ASN1_get_object(&p, &len, &tag, &xclass, length);
118 if (BIO_write(bp, "Error in encoding\n", 18) <= 0)
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);
142 if ((j == 0x21) && (len == 0)) {
144 r = asn1_parse2(bp, &p, (long)(tot - p),
145 offset + (p - *pp), depth + 1,
151 if ((r == 2) || (p >= tot)) {
161 r = asn1_parse2(bp, &p, tmp,
162 offset + (p - *pp), depth + 1,
171 } else if (xclass != 0) {
173 if (BIO_write(bp, "\n", 1) <= 0)
177 if ((tag == V_ASN1_PRINTABLESTRING) ||
178 (tag == V_ASN1_T61STRING) ||
179 (tag == V_ASN1_IA5STRING) ||
180 (tag == V_ASN1_VISIBLESTRING) ||
181 (tag == V_ASN1_NUMERICSTRING) ||
182 (tag == V_ASN1_UTF8STRING) ||
183 (tag == V_ASN1_UTCTIME) || (tag == V_ASN1_GENERALIZEDTIME)) {
184 if (BIO_write(bp, ":", 1) <= 0)
186 if ((len > 0) && BIO_write(bp, (const char *)p, (int)len)
189 } else if (tag == V_ASN1_OBJECT) {
191 if (d2i_ASN1_OBJECT(&o, &opp, len + hl) != NULL) {
192 if (BIO_write(bp, ":", 1) <= 0)
194 i2a_ASN1_OBJECT(bp, o);
196 if (BIO_puts(bp, ":BAD OBJECT") <= 0)
200 } else if (tag == V_ASN1_BOOLEAN) {
202 if (BIO_puts(bp, ":BAD BOOLEAN") <= 0)
207 BIO_printf(bp, ":%u", p[0]);
208 } else if (tag == V_ASN1_BMPSTRING) {
209 /* do the BMP thang */
210 } else if (tag == V_ASN1_OCTET_STRING) {
211 int i, printable = 1;
214 os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl);
215 if (os != NULL && os->length > 0) {
218 * testing whether the octet string is printable
220 for (i = 0; i < os->length; i++) {
221 if (((opp[i] < ' ') &&
224 (opp[i] != '\t')) || (opp[i] > '~')) {
230 /* printable string */
232 if (BIO_write(bp, ":", 1) <= 0)
234 if (BIO_write(bp, (const char *)opp, os->length) <= 0)
238 * not printable => print octet string as hex dump
241 if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0)
243 for (i = 0; i < os->length; i++) {
244 if (BIO_printf(bp, "%02X", opp[i]) <= 0)
248 /* print the normal dump */
251 if (BIO_write(bp, "\n", 1) <= 0)
254 if (BIO_dump_indent(bp,
256 ((dump == -1 || dump >
258 length) ? os->length : dump),
264 ASN1_OCTET_STRING_free(os);
266 } else if (tag == V_ASN1_INTEGER) {
270 ai = d2i_ASN1_INTEGER(NULL, &opp, len + hl);
272 if (BIO_write(bp, ":", 1) <= 0)
274 if (ai->type == V_ASN1_NEG_INTEGER)
275 if (BIO_write(bp, "-", 1) <= 0)
277 for (i = 0; i < ai->length; i++) {
278 if (BIO_printf(bp, "%02X", ai->data[i]) <= 0)
281 if (ai->length == 0) {
282 if (BIO_write(bp, "00", 2) <= 0)
286 if (BIO_puts(bp, ":BAD INTEGER") <= 0)
290 ASN1_INTEGER_free(ai);
292 } else if (tag == V_ASN1_ENUMERATED) {
296 ae = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl);
298 if (BIO_write(bp, ":", 1) <= 0)
300 if (ae->type == V_ASN1_NEG_ENUMERATED)
301 if (BIO_write(bp, "-", 1) <= 0)
303 for (i = 0; i < ae->length; i++) {
304 if (BIO_printf(bp, "%02X", ae->data[i]) <= 0)
307 if (ae->length == 0) {
308 if (BIO_write(bp, "00", 2) <= 0)
312 if (BIO_puts(bp, ":BAD ENUMERATED") <= 0)
316 ASN1_ENUMERATED_free(ae);
318 } else if (len > 0 && dump) {
320 if (BIO_write(bp, "\n", 1) <= 0)
323 if (BIO_dump_indent(bp, (const char *)p,
324 ((dump == -1 || dump > len) ? len : dump),
331 const unsigned char *tmp = op + hl;
332 if (BIO_puts(bp, ":[") <= 0)
334 for (i = 0; i < len; i++) {
335 if (BIO_printf(bp, "%02X", tmp[i]) <= 0)
338 if (BIO_puts(bp, "]") <= 0)
344 if (BIO_write(bp, "\n", 1) <= 0)
348 if ((tag == V_ASN1_EOC) && (xclass == 0)) {
349 ret = 2; /* End of sequence */
358 ASN1_OCTET_STRING_free(os);
359 ASN1_INTEGER_free(ai);
360 ASN1_ENUMERATED_free(ae);
365 const char *ASN1_tag2str(int tag)
367 static const char *const tag2str[] = {
369 "EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING",
371 "NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL",
373 "ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>",
375 "<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET",
377 "NUMERICSTRING", "PRINTABLESTRING", "T61STRING",
379 "VIDEOTEXSTRING", "IA5STRING", "UTCTIME", "GENERALIZEDTIME",
381 "GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING",
383 "UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING"
386 if ((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED))
389 if (tag < 0 || tag > 30)