/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.] */
#include <openssl/asn1.h>
#include <string.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include "asn1_locl.h"
static int traverse_string(const unsigned char *p, int len, int inform,
int (*rfunc) (uint32_t value, void *in),
void *arg);
static int in_utf8(uint32_t value, void *arg);
static int out_utf8(uint32_t value, void *arg);
static int type_str(uint32_t value, void *arg);
static int cpy_asc(uint32_t value, void *arg);
static int cpy_bmp(uint32_t value, void *arg);
static int cpy_univ(uint32_t value, void *arg);
static int cpy_utf8(uint32_t value, void *arg);
static int is_printable(uint32_t value);
/*
* These functions take a string in UTF8, ASCII or multibyte form and a mask
* of permissible ASN1 string types. It then works out the minimal type
* (using the order Printable < IA5 < T61 < BMP < Universal < UTF8) and
* creates a string of the correct type with the supplied data. Yes this is
* horrible: it has to be :-( The 'ncopy' form checks minimum and maximum
* size limits too.
*/
int ASN1_mbstring_copy(ASN1_STRING **out, const unsigned char *in, int len,
int inform, unsigned long mask)
{
return ASN1_mbstring_ncopy(out, in, len, inform, mask, 0, 0);
}
int ASN1_mbstring_ncopy(ASN1_STRING **out, const unsigned char *in, int len,
int inform, unsigned long mask,
long minsize, long maxsize)
{
int str_type;
int ret;
char free_out;
int outform, outlen = 0;
ASN1_STRING *dest;
unsigned char *p;
int nchar;
char strbuf[32];
int (*cpyfunc) (uint32_t, void *) = NULL;
if (len == -1)
len = strlen((const char *)in);
if (!mask)
mask = DIRSTRING_TYPE;
/* First do a string check and work out the number of characters */
switch (inform) {
case MBSTRING_BMP:
if (len & 1) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_BMPSTRING_LENGTH);
return -1;
}
nchar = len >> 1;
break;
case MBSTRING_UNIV:
if (len & 3) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_UNIVERSALSTRING_LENGTH);
return -1;
}
nchar = len >> 2;
break;
case MBSTRING_UTF8:
nchar = 0;
/* This counts the characters and does utf8 syntax checking */
ret = traverse_string(in, len, MBSTRING_UTF8, in_utf8, &nchar);
if (ret < 0) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_UTF8STRING);
return -1;
}
break;
case MBSTRING_ASC:
nchar = len;
break;
default:
OPENSSL_PUT_ERROR(ASN1, ASN1_R_UNKNOWN_FORMAT);
return -1;
}
if ((minsize > 0) && (nchar < minsize)) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_STRING_TOO_SHORT);
BIO_snprintf(strbuf, sizeof strbuf, "%ld", minsize);
ERR_add_error_data(2, "minsize=", strbuf);
return -1;
}
if ((maxsize > 0) && (nchar > maxsize)) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_STRING_TOO_LONG);
BIO_snprintf(strbuf, sizeof strbuf, "%ld", maxsize);
ERR_add_error_data(2, "maxsize=", strbuf);
return -1;
}
/* Now work out minimal type (if any) */
if (traverse_string(in, len, inform, type_str, &mask) < 0) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_ILLEGAL_CHARACTERS);
return -1;
}
/* Now work out output format and string type */
outform = MBSTRING_ASC;
if (mask & B_ASN1_PRINTABLESTRING)
str_type = V_ASN1_PRINTABLESTRING;
else if (mask & B_ASN1_IA5STRING)
str_type = V_ASN1_IA5STRING;
else if (mask & B_ASN1_T61STRING)
str_type = V_ASN1_T61STRING;
else if (mask & B_ASN1_BMPSTRING) {
str_type = V_ASN1_BMPSTRING;
outform = MBSTRING_BMP;
} else if (mask & B_ASN1_UNIVERSALSTRING) {
str_type = V_ASN1_UNIVERSALSTRING;
outform = MBSTRING_UNIV;
} else {
str_type = V_ASN1_UTF8STRING;
outform = MBSTRING_UTF8;
}
if (!out)
return str_type;
if (*out) {
free_out = 0;
dest = *out;
if (dest->data) {
dest->length = 0;
OPENSSL_free(dest->data);
dest->data = NULL;
}
dest->type = str_type;
} else {
free_out = 1;
dest = ASN1_STRING_type_new(str_type);
if (!dest) {
OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
return -1;
}
*out = dest;
}
/* If both the same type just copy across */
if (inform == outform) {
if (!ASN1_STRING_set(dest, in, len)) {
OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
return -1;
}
return str_type;
}
/* Work out how much space the destination will need */
switch (outform) {
case MBSTRING_ASC:
outlen = nchar;
cpyfunc = cpy_asc;
break;
case MBSTRING_BMP:
outlen = nchar << 1;
cpyfunc = cpy_bmp;
break;
case MBSTRING_UNIV:
outlen = nchar << 2;
cpyfunc = cpy_univ;
break;
case MBSTRING_UTF8:
outlen = 0;
traverse_string(in, len, inform, out_utf8, &outlen);
cpyfunc = cpy_utf8;
break;
}
if (!(p = OPENSSL_malloc(outlen + 1))) {
if (free_out)
ASN1_STRING_free(dest);
OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
return -1;
}
dest->length = outlen;
dest->data = p;
p[outlen] = 0;
traverse_string(in, len, inform, cpyfunc, &p);
return str_type;
}
/*
* This function traverses a string and passes the value of each character to
* an optional function along with a void * argument.
*/
static int traverse_string(const unsigned char *p, int len, int inform,
int (*rfunc) (uint32_t value, void *in),
void *arg)
{
uint32_t value;
int ret;
while (len) {
if (inform == MBSTRING_ASC) {
value = *p++;
len--;
} else if (inform == MBSTRING_BMP) {
value = *p++ << 8;
value |= *p++;
len -= 2;
} else if (inform == MBSTRING_UNIV) {
value = ((uint32_t)*p++) << 24;
value |= ((uint32_t)*p++) << 16;
value |= *p++ << 8;
value |= *p++;
len -= 4;
} else {
ret = UTF8_getc(p, len, &value);
if (ret < 0)
return -1;
len -= ret;
p += ret;
}
if (rfunc) {
ret = rfunc(value, arg);
if (ret <= 0)
return ret;
}
}
return 1;
}
/* Various utility functions for traverse_string */
/* Just count number of characters */
static int in_utf8(uint32_t value, void *arg)
{
int *nchar;
nchar = arg;
(*nchar)++;
return 1;
}
/* Determine size of output as a UTF8 String */
static int out_utf8(uint32_t value, void *arg)
{
int *outlen;
outlen = arg;
*outlen += UTF8_putc(NULL, -1, value);
return 1;
}
/*
* Determine the "type" of a string: check each character against a supplied
* "mask".
*/
static int type_str(uint32_t value, void *arg)
{
unsigned long types;
types = *((unsigned long *)arg);
if ((types & B_ASN1_PRINTABLESTRING) && !is_printable(value))
types &= ~B_ASN1_PRINTABLESTRING;
if ((types & B_ASN1_IA5STRING) && (value > 127))
types &= ~B_ASN1_IA5STRING;
if ((types & B_ASN1_T61STRING) && (value > 0xff))
types &= ~B_ASN1_T61STRING;
if ((types & B_ASN1_BMPSTRING) && (value > 0xffff))
types &= ~B_ASN1_BMPSTRING;
if (!types)
return -1;
*((unsigned long *)arg) = types;
return 1;
}
/* Copy one byte per character ASCII like strings */
static int cpy_asc(uint32_t value, void *arg)
{
unsigned char **p, *q;
p = arg;
q = *p;
*q = (unsigned char)value;
(*p)++;
return 1;
}
/* Copy two byte per character BMPStrings */
static int cpy_bmp(uint32_t value, void *arg)
{
unsigned char **p, *q;
p = arg;
q = *p;
*q++ = (unsigned char)((value >> 8) & 0xff);
*q = (unsigned char)(value & 0xff);
*p += 2;
return 1;
}
/* Copy four byte per character UniversalStrings */
static int cpy_univ(uint32_t value, void *arg)
{
unsigned char **p, *q;
p = arg;
q = *p;
*q++ = (unsigned char)((value >> 24) & 0xff);
*q++ = (unsigned char)((value >> 16) & 0xff);
*q++ = (unsigned char)((value >> 8) & 0xff);
*q = (unsigned char)(value & 0xff);
*p += 4;
return 1;
}
/* Copy to a UTF8String */
static int cpy_utf8(uint32_t value, void *arg)
{
unsigned char **p;
int ret;
p = arg;
/* We already know there is enough room so pass 0xff as the length */
ret = UTF8_putc(*p, 0xff, value);
*p += ret;
return 1;
}
/* Return 1 if the character is permitted in a PrintableString */
static int is_printable(uint32_t value)
{
int ch;
if (value > 0x7f)
return 0;
ch = (int)value;
/*
* Note: we can't use 'isalnum' because certain accented characters may
* count as alphanumeric in some environments.
*/
if ((ch >= 'a') && (ch <= 'z'))
return 1;
if ((ch >= 'A') && (ch <= 'Z'))
return 1;
if ((ch >= '0') && (ch <= '9'))
return 1;
if ((ch == ' ') || strchr("'()+,-./:=?", ch))
return 1;
return 0;
}