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/*
* Unix SMB/CIFS implementation.
*
* Implementation of
* http://msdn.microsoft.com/en-us/library/cc232006%28v=PROT.13%29.aspx
*
* Copyright (C) Volker Lendecke 2011
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "replace.h"
#include "reparse_symlink.h"
#include "lib/util/charset/charset.h"
#include "lib/util/byteorder.h"
#include "libcli/smb/smb_constants.h"
#include "libcli/smb/smb_util.h"
#include "lib/util/debug.h"
bool symlink_reparse_buffer_marshall(
const char *substitute, const char *printname, uint32_t flags,
TALLOC_CTX *mem_ctx, uint8_t **pdst, size_t *pdstlen)
{
uint8_t *dst = NULL;
size_t dst_len;
uint8_t *subst_utf16 = NULL;
uint8_t *print_utf16 = NULL;
size_t subst_len = 0;
size_t print_len = 0;
bool ret = false;
bool ok;
if (substitute == NULL) {
return false;
}
if (printname == NULL) {
printname = substitute;
}
ok = convert_string_talloc(
mem_ctx,
CH_UNIX,
CH_UTF16,
substitute,
strlen(substitute),
&subst_utf16,
&subst_len);
if (!ok) {
goto fail;
}
ok = convert_string_talloc(
mem_ctx,
CH_UNIX,
CH_UTF16,
printname,
strlen(printname),
&print_utf16,
&print_len);
if (!ok) {
goto fail;
}
dst_len = subst_len + 20;
if (dst_len < 20) {
goto fail;
}
dst_len += print_len;
if (dst_len < print_len) {
goto fail;
}
dst = talloc_array(mem_ctx, uint8_t, dst_len);
if (dst == NULL) {
goto fail;
}
SIVAL(dst, 0, IO_REPARSE_TAG_SYMLINK); /* ReparseTag */
SSVAL(dst, 4, 12 + subst_len + print_len); /* ReparseDataLength */
SSVAL(dst, 6, 0); /* Reserved */
SSVAL(dst, 8, 0); /* SubstituteNameOffset */
SSVAL(dst, 10, subst_len); /* SubstituteNameLength */
SSVAL(dst, 12, subst_len); /* PrintNameOffset */
SSVAL(dst, 14, print_len); /* PrintNameLength */
SIVAL(dst, 16, flags); /* Flags */
if ((subst_utf16 != NULL) && (subst_len != 0)) {
memcpy(dst + 20, subst_utf16, subst_len);
}
if ((print_utf16 != NULL) && (print_len != 0)) {
memcpy(dst + 20 + subst_len, print_utf16, print_len);
}
*pdst = dst;
*pdstlen = dst_len;
ret = true;
fail:
TALLOC_FREE(subst_utf16);
TALLOC_FREE(print_utf16);
return ret;
}
struct symlink_reparse_struct *symlink_reparse_buffer_parse(
TALLOC_CTX *mem_ctx, const uint8_t *src, size_t srclen)
{
struct symlink_reparse_struct *result = NULL;
uint16_t reparse_data_length;
uint16_t substitute_name_offset, substitute_name_length;
uint16_t print_name_offset, print_name_length;
bool ok;
if (srclen < 20) {
DBG_DEBUG("srclen = %zu, expected >= 20\n", srclen);
goto fail;
}
if (IVAL(src, 0) != IO_REPARSE_TAG_SYMLINK) {
DBG_DEBUG("Got ReparseTag %8.8x, expected %8.8x\n",
IVAL(src, 0),
IO_REPARSE_TAG_SYMLINK);
goto fail;
}
reparse_data_length = SVAL(src, 4);
substitute_name_offset = SVAL(src, 8);
substitute_name_length = SVAL(src, 10);
print_name_offset = SVAL(src, 12);
print_name_length = SVAL(src, 14);
if (reparse_data_length < 12) {
DBG_DEBUG("reparse_data_length = %"PRIu16", expected >= 12\n",
reparse_data_length);
goto fail;
}
if (smb_buffer_oob(srclen - 8, reparse_data_length, 0)) {
DBG_DEBUG("reparse_data_length (%"PRIu16") too large for "
"src_len (%zu)\n",
reparse_data_length,
srclen);
goto fail;
}
if (smb_buffer_oob(reparse_data_length - 12, substitute_name_offset,
substitute_name_length)) {
DBG_DEBUG("substitute_name (%"PRIu16"/%"PRIu16") does not fit "
"in reparse_data_length (%"PRIu16")\n",
substitute_name_offset,
substitute_name_length,
reparse_data_length - 12);
goto fail;
}
if (smb_buffer_oob(reparse_data_length - 12, print_name_offset,
print_name_length)) {
DBG_DEBUG("print_name (%"PRIu16"/%"PRIu16") does not fit in "
"reparse_data_length (%"PRIu16")\n",
print_name_offset,
print_name_length,
reparse_data_length - 12);
goto fail;
}
result = talloc_zero(mem_ctx, struct symlink_reparse_struct);
if (result == NULL) {
DBG_DEBUG("talloc failed\n");
goto fail;
}
ok = convert_string_talloc(
result,
CH_UTF16,
CH_UNIX,
src + 20 + substitute_name_offset,
substitute_name_length,
&result->substitute_name,
NULL);
if (!ok) {
DBG_DEBUG("convert_string_talloc for substitute_name "
"failed\n");
goto fail;
}
ok = convert_string_talloc(
result,
CH_UTF16,
CH_UNIX,
src + 20 + print_name_offset,
print_name_length,
&result->print_name,
NULL);
if (!ok) {
DBG_DEBUG("convert_string_talloc for print_name failed\n");
goto fail;
}
result->unparsed_path_length = SVAL(src, 6);
result->flags = IVAL(src, 16);
return result;
fail:
TALLOC_FREE(result);
return NULL;
}
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