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448 lines
11 KiB
C
Executable File
448 lines
11 KiB
C
Executable File
/* $OpenBSD: a_mbstr.c,v 1.23 2017/01/29 17:49:22 beck Exp $ */
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/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project 1999.
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*/
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/* ====================================================================
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* Copyright (c) 1999 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include <openssl/asn1.h>
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#include <openssl/err.h>
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#include "asn1_locl.h"
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static int traverse_string(const unsigned char *p, int len, int inform,
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int (*rfunc)(unsigned long value, void *in), void *arg);
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static int in_utf8(unsigned long value, void *arg);
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static int out_utf8(unsigned long value, void *arg);
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static int type_str(unsigned long value, void *arg);
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static int cpy_asc(unsigned long value, void *arg);
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static int cpy_bmp(unsigned long value, void *arg);
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static int cpy_univ(unsigned long value, void *arg);
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static int cpy_utf8(unsigned long value, void *arg);
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static int is_printable(unsigned long value);
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/* These functions take a string in UTF8, ASCII or multibyte form and
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* a mask of permissible ASN1 string types. It then works out the minimal
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* type (using the order Printable < IA5 < T61 < BMP < Universal < UTF8)
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* and creates a string of the correct type with the supplied data.
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* Yes this is horrible: it has to be :-(
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* The 'ncopy' form checks minimum and maximum size limits too.
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*/
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int
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ASN1_mbstring_copy(ASN1_STRING **out, const unsigned char *in, int len,
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int inform, unsigned long mask)
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{
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return ASN1_mbstring_ncopy(out, in, len, inform, mask, 0, 0);
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}
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int
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ASN1_mbstring_ncopy(ASN1_STRING **out, const unsigned char *in, int len,
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int inform, unsigned long mask, long minsize, long maxsize)
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{
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int str_type;
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int ret;
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char free_out;
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int outform, outlen = 0;
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ASN1_STRING *dest;
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unsigned char *p;
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int nchar;
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int (*cpyfunc)(unsigned long, void *) = NULL;
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if (len < 0)
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len = strlen((const char *)in);
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if (!mask)
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mask = DIRSTRING_TYPE;
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/* First do a string check and work out the number of characters */
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switch (inform) {
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case MBSTRING_BMP:
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if (len & 1) {
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ASN1error(ASN1_R_INVALID_BMPSTRING_LENGTH);
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return -1;
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}
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nchar = len >> 1;
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break;
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case MBSTRING_UNIV:
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if (len & 3) {
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ASN1error(ASN1_R_INVALID_UNIVERSALSTRING_LENGTH);
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return -1;
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}
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nchar = len >> 2;
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break;
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case MBSTRING_UTF8:
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nchar = 0;
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/* This counts the characters and does utf8 syntax checking */
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ret = traverse_string(in, len, MBSTRING_UTF8, in_utf8, &nchar);
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if (ret < 0) {
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ASN1error(ASN1_R_INVALID_UTF8STRING);
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return -1;
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}
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break;
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case MBSTRING_ASC:
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nchar = len;
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break;
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default:
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ASN1error(ASN1_R_UNKNOWN_FORMAT);
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return -1;
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}
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if ((minsize > 0) && (nchar < minsize)) {
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ASN1error(ASN1_R_STRING_TOO_SHORT);
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ERR_asprintf_error_data("minsize=%ld", minsize);
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return -1;
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}
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if ((maxsize > 0) && (nchar > maxsize)) {
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ASN1error(ASN1_R_STRING_TOO_LONG);
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ERR_asprintf_error_data("maxsize=%ld", maxsize);
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return -1;
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}
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/* Now work out minimal type (if any) */
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if (traverse_string(in, len, inform, type_str, &mask) < 0) {
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ASN1error(ASN1_R_ILLEGAL_CHARACTERS);
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return -1;
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}
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/* Now work out output format and string type */
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outform = MBSTRING_ASC;
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if (mask & B_ASN1_PRINTABLESTRING)
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str_type = V_ASN1_PRINTABLESTRING;
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else if (mask & B_ASN1_IA5STRING)
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str_type = V_ASN1_IA5STRING;
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else if (mask & B_ASN1_T61STRING)
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str_type = V_ASN1_T61STRING;
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else if (mask & B_ASN1_BMPSTRING) {
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str_type = V_ASN1_BMPSTRING;
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outform = MBSTRING_BMP;
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} else if (mask & B_ASN1_UNIVERSALSTRING) {
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str_type = V_ASN1_UNIVERSALSTRING;
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outform = MBSTRING_UNIV;
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} else {
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str_type = V_ASN1_UTF8STRING;
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outform = MBSTRING_UTF8;
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}
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if (!out)
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return str_type;
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if (*out) {
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free_out = 0;
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dest = *out;
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if (dest->data) {
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dest->length = 0;
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free(dest->data);
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dest->data = NULL;
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}
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dest->type = str_type;
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} else {
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free_out = 1;
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dest = ASN1_STRING_type_new(str_type);
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if (!dest) {
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ASN1error(ERR_R_MALLOC_FAILURE);
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return -1;
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}
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*out = dest;
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}
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/* If both the same type just copy across */
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if (inform == outform) {
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if (!ASN1_STRING_set(dest, in, len)) {
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ASN1error(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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return str_type;
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}
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/* Work out how much space the destination will need */
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switch (outform) {
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case MBSTRING_ASC:
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outlen = nchar;
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cpyfunc = cpy_asc;
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break;
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case MBSTRING_BMP:
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outlen = nchar << 1;
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cpyfunc = cpy_bmp;
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break;
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case MBSTRING_UNIV:
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outlen = nchar << 2;
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cpyfunc = cpy_univ;
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break;
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case MBSTRING_UTF8:
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outlen = 0;
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if (traverse_string(in, len, inform, out_utf8, &outlen) < 0) {
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ASN1error(ASN1_R_ILLEGAL_CHARACTERS);
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goto err;
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}
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cpyfunc = cpy_utf8;
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break;
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}
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if (!(p = malloc(outlen + 1))) {
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ASN1error(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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dest->length = outlen;
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dest->data = p;
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p[outlen] = 0;
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traverse_string(in, len, inform, cpyfunc, &p);
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return str_type;
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err:
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if (free_out) {
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ASN1_STRING_free(dest);
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*out = NULL;
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}
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return -1;
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}
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/* This function traverses a string and passes the value of each character
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* to an optional function along with a void * argument.
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*/
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static int
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traverse_string(const unsigned char *p, int len, int inform,
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int (*rfunc)(unsigned long value, void *in), void *arg)
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{
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unsigned long value;
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int ret;
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while (len) {
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switch (inform) {
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case MBSTRING_ASC:
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value = *p++;
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len--;
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break;
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case MBSTRING_BMP:
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value = *p++ << 8;
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value |= *p++;
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/* BMP is explictly defined to not support surrogates */
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if (UNICODE_IS_SURROGATE(value))
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return -1;
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len -= 2;
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break;
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case MBSTRING_UNIV:
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value = (unsigned long)*p++ << 24;
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value |= *p++ << 16;
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value |= *p++ << 8;
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value |= *p++;
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if (value > UNICODE_MAX || UNICODE_IS_SURROGATE(value))
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return -1;
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len -= 4;
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break;
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default:
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ret = UTF8_getc(p, len, &value);
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if (ret < 0)
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return -1;
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len -= ret;
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p += ret;
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break;
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}
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if (rfunc) {
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ret = rfunc(value, arg);
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if (ret <= 0)
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return ret;
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}
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}
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return 1;
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}
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/* Various utility functions for traverse_string */
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/* Just count number of characters */
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static int
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in_utf8(unsigned long value, void *arg)
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{
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int *nchar;
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nchar = arg;
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(*nchar)++;
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return 1;
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}
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/* Determine size of output as a UTF8 String */
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static int
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out_utf8(unsigned long value, void *arg)
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{
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int *outlen;
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int ret;
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outlen = arg;
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ret = UTF8_putc(NULL, -1, value);
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if (ret < 0)
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return ret;
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*outlen += ret;
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return 1;
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}
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/* Determine the "type" of a string: check each character against a
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* supplied "mask".
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*/
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static int
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type_str(unsigned long value, void *arg)
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{
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unsigned long types;
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types = *((unsigned long *)arg);
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if ((types & B_ASN1_PRINTABLESTRING) && !is_printable(value))
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types &= ~B_ASN1_PRINTABLESTRING;
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if ((types & B_ASN1_IA5STRING) && (value > 127))
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types &= ~B_ASN1_IA5STRING;
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if ((types & B_ASN1_T61STRING) && (value > 0xff))
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types &= ~B_ASN1_T61STRING;
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if ((types & B_ASN1_BMPSTRING) && (value > 0xffff))
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types &= ~B_ASN1_BMPSTRING;
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if (!types)
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return -1;
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*((unsigned long *)arg) = types;
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return 1;
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}
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/* Copy one byte per character ASCII like strings */
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static int
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cpy_asc(unsigned long value, void *arg)
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{
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unsigned char **p, *q;
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p = arg;
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q = *p;
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*q = value;
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(*p)++;
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return 1;
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}
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/* Copy two byte per character BMPStrings */
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static int
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cpy_bmp(unsigned long value, void *arg)
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{
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unsigned char **p, *q;
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p = arg;
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q = *p;
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*q++ = (value >> 8) & 0xff;
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*q = value & 0xff;
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*p += 2;
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return 1;
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}
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/* Copy four byte per character UniversalStrings */
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static int
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cpy_univ(unsigned long value, void *arg)
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{
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unsigned char **p, *q;
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p = arg;
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q = *p;
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*q++ = (value >> 24) & 0xff;
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*q++ = (value >> 16) & 0xff;
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*q++ = (value >> 8) & 0xff;
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*q = value & 0xff;
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*p += 4;
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return 1;
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}
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/* Copy to a UTF8String */
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static int
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cpy_utf8(unsigned long value, void *arg)
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{
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unsigned char **p;
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int ret;
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p = arg;
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/* We already know there is enough room so pass 0xff as the length */
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ret = UTF8_putc(*p, 0xff, value);
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*p += ret;
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return 1;
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}
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/* Return 1 if the character is permitted in a PrintableString */
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static int
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is_printable(unsigned long value)
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{
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int ch;
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if (value > 0x7f)
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return 0;
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ch = (int)value;
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/* Note: we can't use 'isalnum' because certain accented
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* characters may count as alphanumeric in some environments.
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*/
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if ((ch >= 'a') && (ch <= 'z'))
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return 1;
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if ((ch >= 'A') && (ch <= 'Z'))
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return 1;
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if ((ch >= '0') && (ch <= '9'))
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return 1;
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if ((ch == ' ') || strchr("'()+,-./:=?", ch))
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return 1;
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return 0;
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}
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