/* 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_grpc/asn1.h>
#include <limits.h>
#include <string.h>
#include <openssl_grpc/bytestring.h>
#include <openssl_grpc/err.h>
#include <openssl_grpc/mem.h>
#include "internal.h"
#include "../bytestring/internal.h"
/*
* 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);
}
OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_BMPSTRING)
OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_UNIVERSALSTRING)
OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_UTF8STRING)
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;
char free_out;
ASN1_STRING *dest;
size_t nchar = 0;
char strbuf[32];
if (len == -1)
len = strlen((const char *)in);
if (!mask)
mask = DIRSTRING_TYPE;
int (*decode_func)(CBS *, uint32_t*);
int error;
switch (inform) {
case MBSTRING_BMP:
decode_func = cbs_get_ucs2_be;
error = ASN1_R_INVALID_BMPSTRING;
break;
case MBSTRING_UNIV:
decode_func = cbs_get_utf32_be;
error = ASN1_R_INVALID_UNIVERSALSTRING;
break;
case MBSTRING_UTF8:
decode_func = cbs_get_utf8;
error = ASN1_R_INVALID_UTF8STRING;
break;
case MBSTRING_ASC:
decode_func = cbs_get_latin1;
error = ERR_R_INTERNAL_ERROR; // Latin-1 inputs are never invalid.
break;
default:
OPENSSL_PUT_ERROR(ASN1, ASN1_R_UNKNOWN_FORMAT);
return -1;
}
/* Check |minsize| and |maxsize| and work out the minimal type, if any. */
CBS cbs;
CBS_init(&cbs, in, len);
size_t utf8_len = 0;
while (CBS_len(&cbs) != 0) {
uint32_t c;
if (!decode_func(&cbs, &c)) {
OPENSSL_PUT_ERROR(ASN1, error);
return -1;
}
if (nchar == 0 &&
(inform == MBSTRING_BMP || inform == MBSTRING_UNIV) &&
c == 0xfeff) {
/* Reject byte-order mark. We could drop it but that would mean
* adding ambiguity around whether a BOM was included or not when
* matching strings.
*
* For a little-endian UCS-2 string, the BOM will appear as 0xfffe
* and will be rejected as noncharacter, below. */
OPENSSL_PUT_ERROR(ASN1, ASN1_R_ILLEGAL_CHARACTERS);
return -1;
}
/* Update which output formats are still possible. */
if ((mask & B_ASN1_PRINTABLESTRING) && !asn1_is_printable(c)) {
mask &= ~B_ASN1_PRINTABLESTRING;
}
if ((mask & B_ASN1_IA5STRING) && (c > 127)) {
mask &= ~B_ASN1_IA5STRING;
}
if ((mask & B_ASN1_T61STRING) && (c > 0xff)) {
mask &= ~B_ASN1_T61STRING;
}
if ((mask & B_ASN1_BMPSTRING) && (c > 0xffff)) {
mask &= ~B_ASN1_BMPSTRING;
}
if (!mask) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_ILLEGAL_CHARACTERS);
return -1;
}
nchar++;
utf8_len += cbb_get_utf8_len(c);
}
if (minsize > 0 && nchar < (size_t)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 > (size_t)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 output format and string type */
int (*encode_func)(CBB *, uint32_t) = cbb_add_latin1;
size_t size_estimate = nchar;
int 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;
encode_func = cbb_add_ucs2_be;
size_estimate = 2 * nchar;
} else if (mask & B_ASN1_UNIVERSALSTRING) {
str_type = V_ASN1_UNIVERSALSTRING;
encode_func = cbb_add_utf32_be;
size_estimate = 4 * nchar;
outform = MBSTRING_UNIV;
} else if (mask & B_ASN1_UTF8STRING) {
str_type = V_ASN1_UTF8STRING;
outform = MBSTRING_UTF8;
encode_func = cbb_add_utf8;
size_estimate = utf8_len;
} else {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_ILLEGAL_CHARACTERS);
return -1;
}
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;
}
CBB cbb;
if (!CBB_init(&cbb, size_estimate + 1)) {
OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
goto err;
}
CBS_init(&cbs, in, len);
while (CBS_len(&cbs) != 0) {
uint32_t c;
if (!decode_func(&cbs, &c) ||
!encode_func(&cbb, c)) {
OPENSSL_PUT_ERROR(ASN1, ERR_R_INTERNAL_ERROR);
goto err;
}
}
uint8_t *data = NULL;
size_t data_len;
if (/* OpenSSL historically NUL-terminated this value with a single byte,
* even for |MBSTRING_BMP| and |MBSTRING_UNIV|. */
!CBB_add_u8(&cbb, 0) ||
!CBB_finish(&cbb, &data, &data_len) ||
data_len < 1 ||
data_len > INT_MAX) {
OPENSSL_PUT_ERROR(ASN1, ERR_R_INTERNAL_ERROR);
OPENSSL_free(data);
goto err;
}
dest->length = (int)(data_len - 1);
dest->data = data;
return str_type;
err:
if (free_out)
ASN1_STRING_free(dest);
CBB_cleanup(&cbb);
return -1;
}
int asn1_is_printable(uint32_t value)
{
if (value > 0x7f) {
return 0;
}
/* Note we cannot use |isalnum| because it is locale-dependent. */
return ('a' <= value && value <= 'z') || //
('A' <= value && value <= 'Z') || //
('0' <= value && value <= '9') || //
value == ' ' || value == '\'' || value == '(' || value == ')' ||
value == '+' || value == ',' || value == '-' || value == '.' ||
value == '/' || value == ':' || value == '=' || value == '?';
}