/
asn1_par.c
380 lines (359 loc) · 13 KB
/
asn1_par.c
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/*
* Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/objects.h>
#include <openssl/asn1.h>
#ifndef ASN1_PARSE_MAXDEPTH
#define ASN1_PARSE_MAXDEPTH 128
#endif
static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
int indent);
static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
int offset, int depth, int indent, int dump);
static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
int indent)
{
static const char fmt[] = "%-18s";
char str[128];
const char *p;
if (constructed & V_ASN1_CONSTRUCTED)
p = "cons: ";
else
p = "prim: ";
if (BIO_write(bp, p, 6) < 6)
goto err;
BIO_indent(bp, indent, 128);
p = str;
if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE)
BIO_snprintf(str, sizeof(str), "priv [ %d ] ", tag);
else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC)
BIO_snprintf(str, sizeof(str), "cont [ %d ]", tag);
else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION)
BIO_snprintf(str, sizeof(str), "appl [ %d ]", tag);
else if (tag > 30)
BIO_snprintf(str, sizeof(str), "<ASN1 %d>", tag);
else
p = ASN1_tag2str(tag);
if (BIO_printf(bp, fmt, p) <= 0)
goto err;
return 1;
err:
return 0;
}
int ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent)
{
return asn1_parse2(bp, &pp, len, 0, 0, indent, 0);
}
int ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent,
int dump)
{
return asn1_parse2(bp, &pp, len, 0, 0, indent, dump);
}
static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
int offset, int depth, int indent, int dump)
{
const unsigned char *p, *ep, *tot, *op, *opp;
long len;
int tag, xclass, ret = 0;
int nl, hl, j, r;
ASN1_OBJECT *o = NULL;
ASN1_OCTET_STRING *os = NULL;
ASN1_INTEGER *ai = NULL;
ASN1_ENUMERATED *ae = NULL;
/* ASN1_BMPSTRING *bmp=NULL; */
int dump_indent, dump_cont = 0;
if (depth > ASN1_PARSE_MAXDEPTH) {
BIO_puts(bp, "BAD RECURSION DEPTH\n");
return 0;
}
dump_indent = 6; /* Because we know BIO_dump_indent() */
p = *pp;
tot = p + length;
while (length > 0) {
op = p;
j = ASN1_get_object(&p, &len, &tag, &xclass, length);
if (j & 0x80) {
if (BIO_write(bp, "Error in encoding\n", 18) <= 0)
goto end;
ret = 0;
goto end;
}
hl = (p - op);
length -= hl;
/*
* if j == 0x21 it is a constructed indefinite length object
*/
if (BIO_printf(bp, "%5ld:", (long)offset + (long)(op - *pp))
<= 0)
goto end;
if (j != (V_ASN1_CONSTRUCTED | 1)) {
if (BIO_printf(bp, "d=%-2d hl=%ld l=%4ld ",
depth, (long)hl, len) <= 0)
goto end;
} else {
if (BIO_printf(bp, "d=%-2d hl=%ld l=inf ", depth, (long)hl) <= 0)
goto end;
}
if (!asn1_print_info(bp, tag, xclass, j, (indent) ? depth : 0))
goto end;
if (j & V_ASN1_CONSTRUCTED) {
const unsigned char *sp = p;
ep = p + len;
if (BIO_write(bp, "\n", 1) <= 0)
goto end;
if (len > length) {
BIO_printf(bp, "length is greater than %ld\n", length);
ret = 0;
goto end;
}
if ((j == 0x21) && (len == 0)) {
for (;;) {
r = asn1_parse2(bp, &p, (long)(tot - p),
offset + (p - *pp), depth + 1,
indent, dump);
if (r == 0) {
ret = 0;
goto end;
}
if ((r == 2) || (p >= tot)) {
len = p - sp;
break;
}
}
} else {
long tmp = len;
while (p < ep) {
sp = p;
r = asn1_parse2(bp, &p, tmp,
offset + (p - *pp), depth + 1,
indent, dump);
if (r == 0) {
ret = 0;
goto end;
}
tmp -= p - sp;
}
}
} else if (xclass != 0) {
p += len;
if (BIO_write(bp, "\n", 1) <= 0)
goto end;
} else {
nl = 0;
if ((tag == V_ASN1_PRINTABLESTRING) ||
(tag == V_ASN1_T61STRING) ||
(tag == V_ASN1_IA5STRING) ||
(tag == V_ASN1_VISIBLESTRING) ||
(tag == V_ASN1_NUMERICSTRING) ||
(tag == V_ASN1_UTF8STRING) ||
(tag == V_ASN1_UTCTIME) || (tag == V_ASN1_GENERALIZEDTIME)) {
if (BIO_write(bp, ":", 1) <= 0)
goto end;
if ((len > 0) && BIO_write(bp, (const char *)p, (int)len)
!= (int)len)
goto end;
} else if (tag == V_ASN1_OBJECT) {
opp = op;
if (d2i_ASN1_OBJECT(&o, &opp, len + hl) != NULL) {
if (BIO_write(bp, ":", 1) <= 0)
goto end;
i2a_ASN1_OBJECT(bp, o);
} else {
if (BIO_puts(bp, ":BAD OBJECT") <= 0)
goto end;
dump_cont = 1;
}
} else if (tag == V_ASN1_BOOLEAN) {
if (len != 1) {
if (BIO_puts(bp, ":BAD BOOLEAN") <= 0)
goto end;
dump_cont = 1;
}
if (len > 0)
BIO_printf(bp, ":%u", p[0]);
} else if (tag == V_ASN1_BMPSTRING) {
/* do the BMP thang */
} else if (tag == V_ASN1_OCTET_STRING) {
int i, printable = 1;
opp = op;
os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl);
if (os != NULL && os->length > 0) {
opp = os->data;
/*
* testing whether the octet string is printable
*/
for (i = 0; i < os->length; i++) {
if (((opp[i] < ' ') &&
(opp[i] != '\n') &&
(opp[i] != '\r') &&
(opp[i] != '\t')) || (opp[i] > '~')) {
printable = 0;
break;
}
}
if (printable)
/* printable string */
{
if (BIO_write(bp, ":", 1) <= 0)
goto end;
if (BIO_write(bp, (const char *)opp, os->length) <= 0)
goto end;
} else if (!dump)
/*
* not printable => print octet string as hex dump
*/
{
if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0)
goto end;
for (i = 0; i < os->length; i++) {
if (BIO_printf(bp, "%02X", opp[i]) <= 0)
goto end;
}
} else
/* print the normal dump */
{
if (!nl) {
if (BIO_write(bp, "\n", 1) <= 0)
goto end;
}
if (BIO_dump_indent(bp,
(const char *)opp,
((dump == -1 || dump >
os->
length) ? os->length : dump),
dump_indent) <= 0)
goto end;
nl = 1;
}
}
ASN1_OCTET_STRING_free(os);
os = NULL;
} else if (tag == V_ASN1_INTEGER) {
int i;
opp = op;
ai = d2i_ASN1_INTEGER(NULL, &opp, len + hl);
if (ai != NULL) {
if (BIO_write(bp, ":", 1) <= 0)
goto end;
if (ai->type == V_ASN1_NEG_INTEGER)
if (BIO_write(bp, "-", 1) <= 0)
goto end;
for (i = 0; i < ai->length; i++) {
if (BIO_printf(bp, "%02X", ai->data[i]) <= 0)
goto end;
}
if (ai->length == 0) {
if (BIO_write(bp, "00", 2) <= 0)
goto end;
}
} else {
if (BIO_puts(bp, ":BAD INTEGER") <= 0)
goto end;
dump_cont = 1;
}
ASN1_INTEGER_free(ai);
ai = NULL;
} else if (tag == V_ASN1_ENUMERATED) {
int i;
opp = op;
ae = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl);
if (ae != NULL) {
if (BIO_write(bp, ":", 1) <= 0)
goto end;
if (ae->type == V_ASN1_NEG_ENUMERATED)
if (BIO_write(bp, "-", 1) <= 0)
goto end;
for (i = 0; i < ae->length; i++) {
if (BIO_printf(bp, "%02X", ae->data[i]) <= 0)
goto end;
}
if (ae->length == 0) {
if (BIO_write(bp, "00", 2) <= 0)
goto end;
}
} else {
if (BIO_puts(bp, ":BAD ENUMERATED") <= 0)
goto end;
dump_cont = 1;
}
ASN1_ENUMERATED_free(ae);
ae = NULL;
} else if (len > 0 && dump) {
if (!nl) {
if (BIO_write(bp, "\n", 1) <= 0)
goto end;
}
if (BIO_dump_indent(bp, (const char *)p,
((dump == -1 || dump > len) ? len : dump),
dump_indent) <= 0)
goto end;
nl = 1;
}
if (dump_cont) {
int i;
const unsigned char *tmp = op + hl;
if (BIO_puts(bp, ":[") <= 0)
goto end;
for (i = 0; i < len; i++) {
if (BIO_printf(bp, "%02X", tmp[i]) <= 0)
goto end;
}
if (BIO_puts(bp, "]") <= 0)
goto end;
dump_cont = 0;
}
if (!nl) {
if (BIO_write(bp, "\n", 1) <= 0)
goto end;
}
p += len;
if ((tag == V_ASN1_EOC) && (xclass == 0)) {
ret = 2; /* End of sequence */
goto end;
}
}
length -= len;
}
ret = 1;
end:
ASN1_OBJECT_free(o);
ASN1_OCTET_STRING_free(os);
ASN1_INTEGER_free(ai);
ASN1_ENUMERATED_free(ae);
*pp = p;
return ret;
}
const char *ASN1_tag2str(int tag)
{
static const char *const tag2str[] = {
/* 0-4 */
"EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING",
/* 5-9 */
"NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL",
/* 10-13 */
"ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>",
/* 15-17 */
"<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET",
/* 18-20 */
"NUMERICSTRING", "PRINTABLESTRING", "T61STRING",
/* 21-24 */
"VIDEOTEXSTRING", "IA5STRING", "UTCTIME", "GENERALIZEDTIME",
/* 25-27 */
"GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING",
/* 28-30 */
"UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING"
};
if ((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED))
tag &= ~0x100;
if (tag < 0 || tag > 30)
return "(unknown)";
return tag2str[tag];
}