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/*
* Copyright (C) 2016 Red Hat, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
#include "gnutls_int.h"
#include "errors.h"
#include "str.h"
#if defined(HAVE_LIBUNISTRING)
#include <uninorm.h>
#include <unistr.h>
#include <unictype.h>
/**
* gnutls_utf8_password_normalize:
* @password: contain the UTF-8 formatted password
* @password_len: the length of the provided password
* @out: the result in an null-terminated allocated string
* @flags: should be zero
*
* This function will convert the provided UTF-8 password according
* to the normalization rules in RFC7613. If GnuTLS is compiled without
* unicode support this function will return %GNUTLS_E_UNIMPLEMENTED_FEATURE.
*
* If the flag %GNUTLS_UTF8_IGNORE_ERRS is specified, any UTF-8 encoding
* errors will be ignored, and in that case the output will be a copy of the input.
*
* Returns: %GNUTLS_E_INVALID_UTF8_STRING on invalid UTF-8 data, or 0 on success.
*
* Since: 3.5.7
**/
int gnutls_utf8_password_normalize(const unsigned char *password, unsigned password_len,
gnutls_datum_t *out, unsigned flags)
{
size_t plen = strlen((char*)password);
size_t ucs4_size = 0, nrm_size = 0;
size_t final_size = 0;
uint8_t *final = NULL;
uint32_t *ucs4 = NULL;
uint32_t *nrm = NULL;
uint8_t *nrmu8 = NULL;
unsigned i;
int ret;
if (plen == 0) {
out->data = (uint8_t*)gnutls_strdup("");
out->size = 0;
if (out->data == NULL)
return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
return 0;
}
/* check for invalid UTF-8 */
if (u8_check((uint8_t*)password, plen) != NULL) {
gnutls_assert();
if (flags & GNUTLS_UTF8_IGNORE_ERRS) {
out->data = gnutls_malloc(password_len+1);
if (out->data == NULL)
return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
out->size = password_len;
memcpy(out->data, password, password_len);
out->data[password_len] = 0;
return 0;
} else {
return GNUTLS_E_INVALID_UTF8_STRING;
}
}
/* convert to UTF-32 */
ucs4 = u8_to_u32((uint8_t*)password, plen, NULL, &ucs4_size);
if (ucs4 == NULL) {
gnutls_assert();
ret = GNUTLS_E_PARSING_ERROR;
goto fail;
}
/* convert all spaces to the ASCII-space */
for (i=0;i<ucs4_size;i++) {
if (uc_is_general_category(ucs4[i], UC_CATEGORY_Zs)) {
ucs4[i] = 0x20;
}
}
/* normalize to NFC */
nrm = u32_normalize(UNINORM_NFC, ucs4, ucs4_size, NULL, &nrm_size);
if (nrm == NULL) {
gnutls_assert();
ret = GNUTLS_E_PARSING_ERROR;
goto fail;
}
/* convert back to UTF-8 */
final_size = 0;
nrmu8 = u32_to_u8(nrm, nrm_size, NULL, &final_size);
if (nrmu8 == NULL) {
gnutls_assert();
ret = GNUTLS_E_PARSING_ERROR;
goto fail;
}
/* copy to output with null terminator */
final = gnutls_malloc(final_size+1);
if (final == NULL) {
gnutls_assert();
ret = GNUTLS_E_MEMORY_ERROR;
goto fail;
}
memcpy(final, nrmu8, final_size);
final[final_size] = 0;
gnutls_free(ucs4);
gnutls_free(nrm);
gnutls_free(nrmu8);
out->data = final;
out->size = final_size;
return 0;
fail:
gnutls_free(final);
gnutls_free(ucs4);
gnutls_free(nrm);
gnutls_free(nrmu8);
return ret;
}
#else
int gnutls_utf8_password_normalize(const uint8_t *password, unsigned password_len,
gnutls_datum_t *out, unsigned flags)
{
if (!(flags & GNUTLS_UTF8_NORM_INTERNAL))
return gnutls_assert_val(GNUTLS_E_UNIMPLEMENTED_FEATURE);
out->data = gnutls_malloc(password_len+1);
if (out->data == NULL)
return GNUTLS_E_MEMORY_ERROR;
memcpy(out->data, password, password_len);
out->data[password_len] = 0;
out->size = password_len;
return 0;
}
#endif
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