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chown.c
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Tue, Feb 25, 21:28

chown.c
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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with this
* work for additional information regarding copyright ownership. The ASF
* licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
#include "winutils.h"
//----------------------------------------------------------------------------
// Function: ChangeFileOwnerBySid
//
// Description:
// Change a file or directory ownership by giving new owner and group SIDs
//
// Returns:
// ERROR_SUCCESS: on success
// Error code: otherwise
//
// Notes:
// This function is long path safe, i.e. the path will be converted to long
// path format if not already converted. So the caller does not need to do
// the converstion before calling the method.
//
static DWORD ChangeFileOwnerBySid(__in LPCWSTR path,
__in_opt PSID pNewOwnerSid, __in_opt PSID pNewGroupSid)
{
LPWSTR longPathName = NULL;
INT oldMode = 0;
SECURITY_INFORMATION securityInformation = 0;
DWORD dwRtnCode = ERROR_SUCCESS;
// Convert the path the the long path
//
dwRtnCode = ConvertToLongPath(path, &longPathName);
if (dwRtnCode != ERROR_SUCCESS)
{
goto ChangeFileOwnerByNameEnd;
}
// Get a pointer to the existing owner information and DACL
//
dwRtnCode = FindFileOwnerAndPermission(longPathName, FALSE, NULL, NULL, &oldMode);
if (dwRtnCode != ERROR_SUCCESS)
{
goto ChangeFileOwnerByNameEnd;
}
// We need SeTakeOwnershipPrivilege to set the owner if the caller does not
// have WRITE_OWNER access to the object; we need SeRestorePrivilege if the
// SID is not contained in the caller's token, and have the SE_GROUP_OWNER
// permission enabled.
//
if (!EnablePrivilege(L"SeTakeOwnershipPrivilege"))
{
fwprintf(stdout, L"INFO: The user does not have SeTakeOwnershipPrivilege.\n");
}
if (!EnablePrivilege(L"SeRestorePrivilege"))
{
fwprintf(stdout, L"INFO: The user does not have SeRestorePrivilege.\n");
}
assert(pNewOwnerSid != NULL || pNewGroupSid != NULL);
// Set the owners of the file.
//
if (pNewOwnerSid != NULL) securityInformation |= OWNER_SECURITY_INFORMATION;
if (pNewGroupSid != NULL) securityInformation |= GROUP_SECURITY_INFORMATION;
dwRtnCode = SetNamedSecurityInfoW(
longPathName,
SE_FILE_OBJECT,
securityInformation,
pNewOwnerSid,
pNewGroupSid,
NULL,
NULL);
if (dwRtnCode != ERROR_SUCCESS)
{
goto ChangeFileOwnerByNameEnd;
}
// Set the permission on the file for the new owner.
//
dwRtnCode = ChangeFileModeByMask(longPathName, oldMode);
if (dwRtnCode != ERROR_SUCCESS)
{
goto ChangeFileOwnerByNameEnd;
}
ChangeFileOwnerByNameEnd:
LocalFree(longPathName);
return dwRtnCode;
}
//----------------------------------------------------------------------------
// Function: Chown
//
// Description:
// The main method for chown command
//
// Returns:
// 0: on success
//
// Notes:
//
//
int Chown(__in int argc, __in_ecount(argc) wchar_t *argv[])
{
LPWSTR pathName = NULL;
LPWSTR ownerInfo = NULL;
WCHAR const * colonPos = NULL;
LPWSTR userName = NULL;
size_t userNameLen = 0;
LPWSTR groupName = NULL;
size_t groupNameLen = 0;
PSID pNewOwnerSid = NULL;
PSID pNewGroupSid = NULL;
DWORD dwRtnCode = 0;
int ret = EXIT_FAILURE;
if (argc >= 3)
{
ownerInfo = argv[1];
pathName = argv[2];
}
else
{
fwprintf(stderr, L"Incorrect command line arguments.\n\n");
ChownUsage(argv[0]);
return ret;
}
// Parsing the owner name
//
if ((colonPos = wcschr(ownerInfo, L':')) != NULL)
{
if (colonPos - ownerInfo != 0)
{
// Length includes NULL terminator
userNameLen = colonPos - ownerInfo + 1;
userName = (LPTSTR)LocalAlloc(LPTR, userNameLen * sizeof(WCHAR));
if (userName == NULL)
{
ReportErrorCode(L"LocalAlloc", GetLastError());
goto ChownEnd;
}
if (FAILED(StringCchCopyNW(userName, userNameLen,
ownerInfo, userNameLen - 1)))
goto ChownEnd;
}
if (*(colonPos + 1) != 0)
{
// Length includes NULL terminator
groupNameLen = wcslen(ownerInfo) - (colonPos - ownerInfo) + 1;
groupName = (LPTSTR)LocalAlloc(LPTR, groupNameLen * sizeof(WCHAR));
if (groupName == NULL)
{
ReportErrorCode(L"LocalAlloc", GetLastError());
goto ChownEnd;
}
if (FAILED(StringCchCopyNW(groupName, groupNameLen,
colonPos + 1, groupNameLen)))
goto ChownEnd;
}
}
else
{
// Length includes NULL terminator
userNameLen = wcslen(ownerInfo) + 1;
userName = (LPWSTR)LocalAlloc(LPTR, userNameLen * sizeof(WCHAR));
if (userName == NULL)
{
ReportErrorCode(L"LocalAlloc", GetLastError());
goto ChownEnd;
}
if (FAILED(StringCchCopyNW(userName, userNameLen, ownerInfo, userNameLen)))
goto ChownEnd;
}
// Not allow zero length user name or group name in the parsing results.
//
assert(userName == NULL || wcslen(userName) > 0);
assert(groupName == NULL || wcslen(groupName) > 0);
// Nothing to change if both names are empty
//
if ((userName == NULL) && (groupName == NULL))
{
ret = EXIT_SUCCESS;
goto ChownEnd;
}
if (userName != NULL)
{
dwRtnCode = GetSidFromAcctNameW(userName, &pNewOwnerSid);
if (dwRtnCode != ERROR_SUCCESS)
{
ReportErrorCode(L"GetSidFromAcctName", dwRtnCode);
fwprintf(stderr, L"Invalid user name: %s\n", userName);
goto ChownEnd;
}
}
if (groupName != NULL)
{
dwRtnCode = GetSidFromAcctNameW(groupName, &pNewGroupSid);
if (dwRtnCode != ERROR_SUCCESS)
{
ReportErrorCode(L"GetSidFromAcctName", dwRtnCode);
fwprintf(stderr, L"Invalid group name: %s\n", groupName);
goto ChownEnd;
}
}
if (wcslen(pathName) == 0 || wcsspn(pathName, L"/?|><:*\"") != 0)
{
fwprintf(stderr, L"Incorrect file name format: %s\n", pathName);
goto ChownEnd;
}
dwRtnCode = ChangeFileOwnerBySid(pathName, pNewOwnerSid, pNewGroupSid);
if (dwRtnCode != ERROR_SUCCESS)
{
ReportErrorCode(L"ChangeFileOwnerBySid", dwRtnCode);
goto ChownEnd;
}
ret = EXIT_SUCCESS;
ChownEnd:
LocalFree(userName);
LocalFree(groupName);
LocalFree(pNewOwnerSid);
LocalFree(pNewGroupSid);
return ret;
}
void ChownUsage(LPCWSTR program)
{
fwprintf(stdout, L"\
Usage: %s [OWNER][:[GROUP]] [FILE]\n\
Change the owner and/or group of the FILE to OWNER and/or GROUP.\n\
\n\
Note:\n\
On Linux, if a colon but no group name follows the user name, the group of\n\
the files is changed to that user\'s login group. Windows has no concept of\n\
a user's login group. So we do not change the group owner in this case.\n",
program);
}

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