MDEV-17008 prepare with datadir, on Windows, does not set ACL

on tablespace files

Fix is to always add Full Control for NetworkService account, for every
file that copyback/moveback copies around.

extra/mariabackup/backup_copy.cc

@@ -989,6 +989,65 @@ run_data_threads(datadir_iter_t *it, os_thread_func_t func, uint n)
 	return(ret);
 }
 
+#ifdef _WIN32
+#include <windows.h>
+#include <accctrl.h>
+#include <aclapi.h>
+/*
+  On Windows, fix permission of the file after "copyback"
+  We assume that after copyback, mysqld will run as service as NetworkService
+  user, thus well give full permission on given file to that user.
+*/
+
+static int fix_win_file_permissions(const char *file)
+{
+	struct {
+		TOKEN_USER tokenUser;
+		BYTE buffer[SECURITY_MAX_SID_SIZE];
+	} tokenInfoBuffer;
+	HANDLE hFile = CreateFile(file, READ_CONTROL | WRITE_DAC, 0, NULL, OPEN_EXISTING,
+		FILE_FLAG_BACKUP_SEMANTICS, NULL);
+	if (hFile == INVALID_HANDLE_VALUE)
+		return -1;
+	ACL* pOldDACL;
+	SECURITY_DESCRIPTOR* pSD = NULL;
+	EXPLICIT_ACCESS ea = { 0 };
+	BOOL isWellKnownSID = FALSE;
+	PSID pSid = NULL;
+
+	GetSecurityInfo(hFile, SE_FILE_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL,
+		&pOldDACL, NULL, (void**)&pSD);
+	DWORD size = SECURITY_MAX_SID_SIZE;
+	pSid = (PSID)tokenInfoBuffer.buffer;
+	if (!CreateWellKnownSid(WinNetworkServiceSid, NULL, pSid,
+		&size))
+	{
+		return 1;
+	}
+	ea.Trustee.TrusteeForm = TRUSTEE_IS_SID;
+	ea.Trustee.ptstrName = (LPTSTR)pSid;
+
+	ea.grfAccessMode = GRANT_ACCESS;
+	ea.grfAccessPermissions = GENERIC_ALL;
+	ea.grfInheritance = CONTAINER_INHERIT_ACE | OBJECT_INHERIT_ACE;
+	ea.Trustee.TrusteeType = TRUSTEE_IS_UNKNOWN;
+	ACL* pNewDACL = 0;
+	DWORD err = SetEntriesInAcl(1, &ea, pOldDACL, &pNewDACL);
+	if (pNewDACL)
+	{
+		SetSecurityInfo(hFile, SE_FILE_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL,
+			pNewDACL, NULL);
+	}
+	if (pSD != NULL)
+		LocalFree((HLOCAL)pSD);
+	if (pNewDACL != NULL)
+		LocalFree((HLOCAL)pNewDACL);
+	CloseHandle(hFile);
+	return 0;
+}
+
+#endif
+
 
 /************************************************************************
 Copy file for backup/restore.
@@ -1037,6 +1096,10 @@ copy_file(ds_ctxt_t *datasink,
 	/* close */
 	msg(thread_n,"        ...done");
 	datafile_close(&cursor);
+#ifdef _WIN32
+	if (xtrabackup_copy_back || xtrabackup_move_back)
+		ut_a(!fix_win_file_permissions(dstfile->path));
+#endif
 	if (ds_close(dstfile)) {
 		goto error_close;
 	}
@@ -1107,7 +1170,10 @@ move_file(ds_ctxt_t *datasink,
 			errbuf);
 		return(false);
 	}
-
+#ifdef _WIN32
+	if (xtrabackup_copy_back || xtrabackup_move_back)
+		ut_a(!fix_win_file_permissions(dst_file_path_abs));
+#endif
 	msg(thread_n,"        ...done");
 
 	return(true);