60eba30f60
Check that sprint, strcpy don't overflow. Avoid some strlen operations when the previous sprintf return value can be used. Also fix the undefined behaviour `*(long *)x = y` when x isn't a long or character pointer. ISO/IEC 9899:1999 6.5/7 for the details. Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/3869)
375 lines
13 KiB
C
375 lines
13 KiB
C
/*
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* Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/buffer.h>
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#include <openssl/objects.h>
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#include <openssl/asn1.h>
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#ifndef ASN1_PARSE_MAXDEPTH
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#define ASN1_PARSE_MAXDEPTH 128
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#endif
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static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
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int indent);
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static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
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int offset, int depth, int indent, int dump);
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static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
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int indent)
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{
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static const char fmt[] = "%-18s";
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char str[128];
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const char *p;
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if (constructed & V_ASN1_CONSTRUCTED)
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p = "cons: ";
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else
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p = "prim: ";
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if (BIO_write(bp, p, 6) < 6)
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goto err;
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BIO_indent(bp, indent, 128);
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p = str;
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if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE)
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BIO_snprintf(str, sizeof(str), "priv [ %d ] ", tag);
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else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC)
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BIO_snprintf(str, sizeof(str), "cont [ %d ]", tag);
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else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION)
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BIO_snprintf(str, sizeof(str), "appl [ %d ]", tag);
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else if (tag > 30)
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BIO_snprintf(str, sizeof(str), "<ASN1 %d>", tag);
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else
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p = ASN1_tag2str(tag);
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if (BIO_printf(bp, fmt, p) <= 0)
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goto err;
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return 1;
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err:
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return 0;
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}
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int ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent)
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{
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return asn1_parse2(bp, &pp, len, 0, 0, indent, 0);
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}
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int ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent,
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int dump)
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{
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return asn1_parse2(bp, &pp, len, 0, 0, indent, dump);
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}
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static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
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int offset, int depth, int indent, int dump)
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{
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const unsigned char *p, *ep, *tot, *op, *opp;
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long len;
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int tag, xclass, ret = 0;
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int nl, hl, j, r;
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ASN1_OBJECT *o = NULL;
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ASN1_OCTET_STRING *os = NULL;
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/* ASN1_BMPSTRING *bmp=NULL; */
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int dump_indent, dump_cont = 0;
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if (depth > ASN1_PARSE_MAXDEPTH) {
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BIO_puts(bp, "BAD RECURSION DEPTH\n");
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return 0;
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}
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dump_indent = 6; /* Because we know BIO_dump_indent() */
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p = *pp;
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tot = p + length;
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while (length > 0) {
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op = p;
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j = ASN1_get_object(&p, &len, &tag, &xclass, length);
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if (j & 0x80) {
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if (BIO_write(bp, "Error in encoding\n", 18) <= 0)
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goto end;
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ret = 0;
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goto end;
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}
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hl = (p - op);
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length -= hl;
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/*
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* if j == 0x21 it is a constructed indefinite length object
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*/
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if (BIO_printf(bp, "%5ld:", (long)offset + (long)(op - *pp))
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<= 0)
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goto end;
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if (j != (V_ASN1_CONSTRUCTED | 1)) {
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if (BIO_printf(bp, "d=%-2d hl=%ld l=%4ld ",
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depth, (long)hl, len) <= 0)
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goto end;
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} else {
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if (BIO_printf(bp, "d=%-2d hl=%ld l=inf ", depth, (long)hl) <= 0)
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goto end;
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}
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if (!asn1_print_info(bp, tag, xclass, j, (indent) ? depth : 0))
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goto end;
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if (j & V_ASN1_CONSTRUCTED) {
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const unsigned char *sp = p;
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ep = p + len;
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if (BIO_write(bp, "\n", 1) <= 0)
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goto end;
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if (len > length) {
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BIO_printf(bp, "length is greater than %ld\n", length);
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ret = 0;
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goto end;
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}
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if ((j == 0x21) && (len == 0)) {
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for (;;) {
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r = asn1_parse2(bp, &p, (long)(tot - p),
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offset + (p - *pp), depth + 1,
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indent, dump);
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if (r == 0) {
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ret = 0;
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goto end;
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}
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if ((r == 2) || (p >= tot)) {
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len = p - sp;
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break;
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}
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}
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} else {
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long tmp = len;
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while (p < ep) {
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sp = p;
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r = asn1_parse2(bp, &p, tmp,
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offset + (p - *pp), depth + 1,
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indent, dump);
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if (r == 0) {
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ret = 0;
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goto end;
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}
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tmp -= p - sp;
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}
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}
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} else if (xclass != 0) {
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p += len;
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if (BIO_write(bp, "\n", 1) <= 0)
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goto end;
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} else {
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nl = 0;
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if ((tag == V_ASN1_PRINTABLESTRING) ||
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(tag == V_ASN1_T61STRING) ||
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(tag == V_ASN1_IA5STRING) ||
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(tag == V_ASN1_VISIBLESTRING) ||
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(tag == V_ASN1_NUMERICSTRING) ||
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(tag == V_ASN1_UTF8STRING) ||
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(tag == V_ASN1_UTCTIME) || (tag == V_ASN1_GENERALIZEDTIME)) {
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if (BIO_write(bp, ":", 1) <= 0)
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goto end;
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if ((len > 0) && BIO_write(bp, (const char *)p, (int)len)
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!= (int)len)
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goto end;
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} else if (tag == V_ASN1_OBJECT) {
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opp = op;
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if (d2i_ASN1_OBJECT(&o, &opp, len + hl) != NULL) {
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if (BIO_write(bp, ":", 1) <= 0)
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goto end;
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i2a_ASN1_OBJECT(bp, o);
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} else {
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if (BIO_puts(bp, ":BAD OBJECT") <= 0)
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goto end;
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dump_cont = 1;
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}
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} else if (tag == V_ASN1_BOOLEAN) {
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if (len != 1) {
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if (BIO_puts(bp, ":BAD BOOLEAN") <= 0)
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goto end;
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dump_cont = 1;
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}
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if (len > 0)
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BIO_printf(bp, ":%u", p[0]);
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} else if (tag == V_ASN1_BMPSTRING) {
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/* do the BMP thang */
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} else if (tag == V_ASN1_OCTET_STRING) {
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int i, printable = 1;
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opp = op;
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os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl);
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if (os != NULL && os->length > 0) {
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opp = os->data;
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/*
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* testing whether the octet string is printable
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*/
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for (i = 0; i < os->length; i++) {
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if (((opp[i] < ' ') &&
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(opp[i] != '\n') &&
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(opp[i] != '\r') &&
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(opp[i] != '\t')) || (opp[i] > '~')) {
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printable = 0;
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break;
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}
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}
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if (printable)
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/* printable string */
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{
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if (BIO_write(bp, ":", 1) <= 0)
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goto end;
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if (BIO_write(bp, (const char *)opp, os->length) <= 0)
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goto end;
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} else if (!dump)
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/*
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* not printable => print octet string as hex dump
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*/
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{
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if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0)
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goto end;
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for (i = 0; i < os->length; i++) {
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if (BIO_printf(bp, "%02X", opp[i]) <= 0)
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goto end;
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}
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} else
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/* print the normal dump */
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{
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if (!nl) {
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if (BIO_write(bp, "\n", 1) <= 0)
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goto end;
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}
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if (BIO_dump_indent(bp,
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(const char *)opp,
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((dump == -1 || dump >
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os->
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length) ? os->length : dump),
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dump_indent) <= 0)
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goto end;
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nl = 1;
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}
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}
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ASN1_OCTET_STRING_free(os);
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os = NULL;
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} else if (tag == V_ASN1_INTEGER) {
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ASN1_INTEGER *bs;
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int i;
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opp = op;
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bs = d2i_ASN1_INTEGER(NULL, &opp, len + hl);
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if (bs != NULL) {
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if (BIO_write(bp, ":", 1) <= 0)
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goto end;
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if (bs->type == V_ASN1_NEG_INTEGER)
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if (BIO_write(bp, "-", 1) <= 0)
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goto end;
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for (i = 0; i < bs->length; i++) {
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if (BIO_printf(bp, "%02X", bs->data[i]) <= 0)
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goto end;
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}
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if (bs->length == 0) {
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if (BIO_write(bp, "00", 2) <= 0)
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goto end;
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}
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} else {
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if (BIO_puts(bp, ":BAD INTEGER") <= 0)
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goto end;
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dump_cont = 1;
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}
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ASN1_INTEGER_free(bs);
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} else if (tag == V_ASN1_ENUMERATED) {
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ASN1_ENUMERATED *bs;
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int i;
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opp = op;
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bs = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl);
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if (bs != NULL) {
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if (BIO_write(bp, ":", 1) <= 0)
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goto end;
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if (bs->type == V_ASN1_NEG_ENUMERATED)
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if (BIO_write(bp, "-", 1) <= 0)
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goto end;
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for (i = 0; i < bs->length; i++) {
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if (BIO_printf(bp, "%02X", bs->data[i]) <= 0)
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goto end;
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}
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if (bs->length == 0) {
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if (BIO_write(bp, "00", 2) <= 0)
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goto end;
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}
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} else {
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if (BIO_puts(bp, ":BAD ENUMERATED") <= 0)
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goto end;
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dump_cont = 1;
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}
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ASN1_ENUMERATED_free(bs);
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} else if (len > 0 && dump) {
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if (!nl) {
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if (BIO_write(bp, "\n", 1) <= 0)
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goto end;
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}
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if (BIO_dump_indent(bp, (const char *)p,
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((dump == -1 || dump > len) ? len : dump),
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dump_indent) <= 0)
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goto end;
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nl = 1;
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}
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if (dump_cont) {
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int i;
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const unsigned char *tmp = op + hl;
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if (BIO_puts(bp, ":[") <= 0)
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goto end;
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for (i = 0; i < len; i++) {
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if (BIO_printf(bp, "%02X", tmp[i]) <= 0)
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goto end;
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}
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if (BIO_puts(bp, "]") <= 0)
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goto end;
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}
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if (!nl) {
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if (BIO_write(bp, "\n", 1) <= 0)
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goto end;
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}
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p += len;
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if ((tag == V_ASN1_EOC) && (xclass == 0)) {
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ret = 2; /* End of sequence */
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goto end;
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}
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}
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length -= len;
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}
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ret = 1;
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end:
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ASN1_OBJECT_free(o);
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ASN1_OCTET_STRING_free(os);
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*pp = p;
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return ret;
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}
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const char *ASN1_tag2str(int tag)
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{
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static const char *const tag2str[] = {
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/* 0-4 */
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"EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING",
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/* 5-9 */
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"NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL",
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/* 10-13 */
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"ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>",
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/* 15-17 */
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"<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET",
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/* 18-20 */
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"NUMERICSTRING", "PRINTABLESTRING", "T61STRING",
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/* 21-24 */
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"VIDEOTEXSTRING", "IA5STRING", "UTCTIME", "GENERALIZEDTIME",
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/* 25-27 */
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"GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING",
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/* 28-30 */
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"UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING"
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};
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if ((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED))
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tag &= ~0x100;
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if (tag < 0 || tag > 30)
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return "(unknown)";
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return tag2str[tag];
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}
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