713 lines
16 KiB
C++
713 lines
16 KiB
C++
/* fhandler_registry.cc: fhandler for /proc/registry virtual filesystem
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Copyright 2002, 2003, 2003, 2004, 2005, 2006, 2007 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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/* FIXME: Access permissions are ignored at the moment. */
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#include "winsup.h"
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/cygwin.h>
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#include "cygerrno.h"
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#include "security.h"
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include <assert.h>
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#define _COMPILING_NEWLIB
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#include <dirent.h>
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/* If this bit is set in __d_position then we are enumerating values,
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* else sub-keys. keeping track of where we are is horribly messy
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* the bottom 16 bits are the absolute position and the top 15 bits
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* make up the value index if we are enuerating values.
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*/
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static const _off_t REG_ENUM_VALUES_MASK = 0x8000000;
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static const _off_t REG_POSITION_MASK = 0xffff;
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/* List of root keys in /proc/registry.
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* Possibly we should filter out those not relevant to the flavour of Windows
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* Cygwin is running on.
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*/
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static const char *registry_listing[] =
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{
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".",
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"..",
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"HKEY_CLASSES_ROOT",
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"HKEY_CURRENT_CONFIG",
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"HKEY_CURRENT_USER",
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"HKEY_LOCAL_MACHINE",
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"HKEY_USERS",
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"HKEY_PERFORMANCE_DATA", // NT/2000/XP
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NULL
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};
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static const HKEY registry_keys[] =
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{
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(HKEY) INVALID_HANDLE_VALUE,
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(HKEY) INVALID_HANDLE_VALUE,
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HKEY_CLASSES_ROOT,
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HKEY_CURRENT_CONFIG,
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HKEY_CURRENT_USER,
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HKEY_LOCAL_MACHINE,
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HKEY_USERS,
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HKEY_PERFORMANCE_DATA
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};
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static const int ROOT_KEY_COUNT = sizeof (registry_keys) / sizeof (HKEY);
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/* These get added to each subdirectory in /proc/registry.
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* If we wanted to implement writing, we could maybe add a '.writable' entry or
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* suchlike.
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*/
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static const char *special_dot_files[] =
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{
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".",
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"..",
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NULL
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};
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static const int SPECIAL_DOT_FILE_COUNT =
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(sizeof (special_dot_files) / sizeof (const char *)) - 1;
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/* Name given to default values */
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static const char *DEFAULT_VALUE_NAME = "@";
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static HKEY open_key (const char *name, REGSAM access, DWORD wow64, bool isValue);
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/* Returns 0 if path doesn't exist, >0 if path is a directory,
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* <0 if path is a file.
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*
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* We open the last key but one and then enum it's sub-keys and values to see if the
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* final component is there. This gets round the problem of not having security access
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* to the final key in the path.
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*/
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int
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fhandler_registry::exists ()
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{
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int file_type = 0, index = 0, pathlen;
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DWORD buf_size = CYG_MAX_PATH;
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LONG error;
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char buf[buf_size];
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const char *file;
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HKEY hKey = (HKEY) INVALID_HANDLE_VALUE;
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const char *path = get_name ();
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debug_printf ("exists (%s)", path);
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path += proc_len + prefix_len + 1;
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if (*path)
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path++;
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else
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{
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file_type = 2;
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goto out;
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}
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pathlen = strlen (path);
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file = path + pathlen - 1;
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if (isdirsep (*file) && pathlen > 1)
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file--;
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while (!isdirsep (*file))
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file--;
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file++;
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if (file == path)
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{
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for (int i = 0; registry_listing[i]; i++)
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if (path_prefix_p
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(registry_listing[i], path, strlen (registry_listing[i])))
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{
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file_type = 1;
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goto out;
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}
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goto out;
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}
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hKey = open_key (path, KEY_READ, wow64, false);
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if (hKey != (HKEY) INVALID_HANDLE_VALUE)
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file_type = 1;
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else
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{
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hKey = open_key (path, KEY_READ, wow64, true);
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if (hKey == (HKEY) INVALID_HANDLE_VALUE)
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return 0;
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while (ERROR_SUCCESS ==
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(error = RegEnumKeyEx (hKey, index++, buf, &buf_size, NULL, NULL,
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NULL, NULL))
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|| (error == ERROR_MORE_DATA))
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{
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if (pathmatch (buf, file))
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{
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file_type = 1;
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goto out;
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}
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buf_size = CYG_MAX_PATH;
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}
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if (error != ERROR_NO_MORE_ITEMS)
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{
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seterrno_from_win_error (__FILE__, __LINE__, error);
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goto out;
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}
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index = 0;
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buf_size = CYG_MAX_PATH;
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while (ERROR_SUCCESS ==
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(error = RegEnumValue (hKey, index++, buf, &buf_size, NULL, NULL,
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NULL, NULL))
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|| (error == ERROR_MORE_DATA))
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{
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if (pathmatch (buf, file) || (buf[0] == '\0' &&
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pathmatch (file, DEFAULT_VALUE_NAME)))
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{
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file_type = -1;
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goto out;
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}
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buf_size = CYG_MAX_PATH;
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}
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if (error != ERROR_NO_MORE_ITEMS)
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{
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seterrno_from_win_error (__FILE__, __LINE__, error);
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goto out;
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}
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}
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out:
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if (hKey != (HKEY) INVALID_HANDLE_VALUE)
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RegCloseKey (hKey);
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return file_type;
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}
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void
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fhandler_registry::set_name (path_conv &in_pc)
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{
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if (strncasematch (in_pc.normalized_path, "/proc/registry32", 16))
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{
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wow64 = KEY_WOW64_32KEY;
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prefix_len += 2;
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}
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else if (strncasematch (in_pc.normalized_path, "/proc/registry64", 16))
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{
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wow64 = KEY_WOW64_64KEY;
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prefix_len += 2;
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}
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fhandler_base::set_name (in_pc);
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}
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fhandler_registry::fhandler_registry ():
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fhandler_proc ()
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{
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wow64 = 0;
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prefix_len = sizeof ("registry") - 1;
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}
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int
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fhandler_registry::fstat (struct __stat64 *buf)
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{
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fhandler_base::fstat (buf);
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buf->st_mode &= ~_IFMT & NO_W;
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int file_type = exists ();
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switch (file_type)
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{
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case 0:
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set_errno (ENOENT);
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return -1;
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case 1:
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buf->st_mode |= S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH;
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break;
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case 2:
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buf->st_mode |= S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH;
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buf->st_nlink = ROOT_KEY_COUNT;
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break;
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default:
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case -1:
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buf->st_mode |= S_IFREG;
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buf->st_mode &= NO_X;
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break;
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}
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if (file_type != 0 && file_type != 2)
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{
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HKEY hKey;
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const char *path = get_name () + proc_len + prefix_len + 2;
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hKey =
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open_key (path, STANDARD_RIGHTS_READ | KEY_QUERY_VALUE, wow64,
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(file_type < 0) ? true : false);
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if (hKey != (HKEY) INVALID_HANDLE_VALUE)
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{
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FILETIME ftLastWriteTime;
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DWORD subkey_count;
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if (ERROR_SUCCESS ==
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RegQueryInfoKey (hKey, NULL, NULL, NULL, &subkey_count, NULL,
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NULL, NULL, NULL, NULL, NULL,
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&ftLastWriteTime))
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{
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to_timestruc_t (&ftLastWriteTime, &buf->st_mtim);
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buf->st_ctim = buf->st_birthtim = buf->st_mtim;
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time_as_timestruc_t (&buf->st_atim);
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if (file_type > 0)
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buf->st_nlink = subkey_count + 2;
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else
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{
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int pathlen = strlen (path);
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const char *value_name = path + pathlen - 1;
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if (isdirsep (*value_name) && pathlen > 1)
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value_name--;
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while (!isdirsep (*value_name))
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value_name--;
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value_name++;
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DWORD dwSize;
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if (ERROR_SUCCESS ==
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RegQueryValueEx (hKey, value_name, NULL, NULL, NULL,
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&dwSize))
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buf->st_size = dwSize;
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}
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__uid32_t uid;
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__gid32_t gid;
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if (get_object_attribute
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((HANDLE) hKey, SE_REGISTRY_KEY, &buf->st_mode, &uid,
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&gid) == 0)
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{
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buf->st_uid = uid;
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buf->st_gid = gid;
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buf->st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
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if (file_type > 0)
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buf->st_mode |= S_IFDIR;
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else
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buf->st_mode &= NO_X;
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}
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}
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RegCloseKey (hKey);
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}
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else
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{
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/* Here's the problem: If we can't open the key, we don't know
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nothing at all about the key/value. It's only clear that
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the current user has no read access. At this point it's
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rather unlikely that the user has write or execute access
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and it's also rather unlikely that the user is the owner.
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Therefore it's probably most safe to assume unknown ownership
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and no permissions for nobody. */
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buf->st_uid = UNKNOWN_UID;
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buf->st_gid = UNKNOWN_GID;
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buf->st_mode &= ~0777;
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}
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}
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return 0;
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}
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int
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fhandler_registry::readdir (DIR *dir, dirent *de)
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{
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DWORD buf_size = CYG_MAX_PATH;
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char buf[buf_size];
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HANDLE handle;
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const char *path = dir->__d_dirname + proc_len + 1 + prefix_len;
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LONG error;
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int res = ENMFILE;
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dir->__flags |= dirent_saw_dot | dirent_saw_dot_dot;
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if (*path == 0)
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{
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if (dir->__d_position >= ROOT_KEY_COUNT)
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goto out;
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strcpy (de->d_name, registry_listing[dir->__d_position++]);
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res = 0;
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goto out;
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}
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if (dir->__handle == INVALID_HANDLE_VALUE && dir->__d_position == 0)
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{
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handle = open_key (path + 1, KEY_READ, wow64, false);
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dir->__handle = handle;
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}
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if (dir->__handle == INVALID_HANDLE_VALUE)
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goto out;
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if (dir->__d_position < SPECIAL_DOT_FILE_COUNT)
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{
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strcpy (de->d_name, special_dot_files[dir->__d_position++]);
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res = 0;
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goto out;
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}
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retry:
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if (dir->__d_position & REG_ENUM_VALUES_MASK)
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/* For the moment, the type of key is ignored here. when write access is added,
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* maybe add an extension for the type of each value?
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*/
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error = RegEnumValue ((HKEY) dir->__handle,
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(dir->__d_position & ~REG_ENUM_VALUES_MASK) >> 16,
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buf, &buf_size, NULL, NULL, NULL, NULL);
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else
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error =
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RegEnumKeyEx ((HKEY) dir->__handle, dir->__d_position -
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SPECIAL_DOT_FILE_COUNT, buf, &buf_size, NULL, NULL, NULL,
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NULL);
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if (error == ERROR_NO_MORE_ITEMS
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&& (dir->__d_position & REG_ENUM_VALUES_MASK) == 0)
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{
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/* If we're finished with sub-keys, start on values under this key. */
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dir->__d_position |= REG_ENUM_VALUES_MASK;
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buf_size = CYG_MAX_PATH;
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goto retry;
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}
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if (error != ERROR_SUCCESS && error != ERROR_MORE_DATA)
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{
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RegCloseKey ((HKEY) dir->__handle);
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dir->__handle = INVALID_HANDLE_VALUE;
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if (error != ERROR_NO_MORE_ITEMS)
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seterrno_from_win_error (__FILE__, __LINE__, error);
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goto out;
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}
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/* We get here if `buf' contains valid data. */
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if (*buf == 0)
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strcpy (de->d_name, DEFAULT_VALUE_NAME);
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else
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strcpy (de->d_name, buf);
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dir->__d_position++;
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if (dir->__d_position & REG_ENUM_VALUES_MASK)
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dir->__d_position += 0x10000;
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res = 0;
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out:
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syscall_printf ("%d = readdir (%p, %p)", res, dir, de);
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return res;
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}
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_off64_t
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fhandler_registry::telldir (DIR * dir)
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{
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return dir->__d_position & REG_POSITION_MASK;
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}
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void
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fhandler_registry::seekdir (DIR * dir, _off64_t loc)
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{
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/* Unfortunately cannot simply set __d_position due to transition from sub-keys to
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* values.
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*/
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rewinddir (dir);
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while (loc > (dir->__d_position & REG_POSITION_MASK))
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if (!readdir (dir, dir->__d_dirent))
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break;
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}
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void
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fhandler_registry::rewinddir (DIR * dir)
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{
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if (dir->__handle != INVALID_HANDLE_VALUE)
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{
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RegCloseKey ((HKEY) dir->__handle);
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dir->__handle = INVALID_HANDLE_VALUE;
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}
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dir->__d_position = 0;
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dir->__flags = dirent_saw_dot | dirent_saw_dot_dot;
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}
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int
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fhandler_registry::closedir (DIR * dir)
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{
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int res = 0;
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if (dir->__handle != INVALID_HANDLE_VALUE &&
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RegCloseKey ((HKEY) dir->__handle) != ERROR_SUCCESS)
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{
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__seterrno ();
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res = -1;
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}
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syscall_printf ("%d = closedir (%p)", res, dir);
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return 0;
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}
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int
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fhandler_registry::open (int flags, mode_t mode)
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{
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int pathlen;
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const char *file;
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HKEY handle;
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int res = fhandler_virtual::open (flags, mode);
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if (!res)
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goto out;
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const char *path;
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path = get_name () + proc_len + 1 + prefix_len;
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if (!*path)
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{
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if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
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{
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set_errno (EEXIST);
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res = 0;
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goto out;
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}
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else if (flags & O_WRONLY)
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{
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set_errno (EISDIR);
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res = 0;
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goto out;
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}
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else
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{
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flags |= O_DIROPEN;
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goto success;
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}
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}
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path++;
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pathlen = strlen (path);
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file = path + pathlen - 1;
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if (isdirsep (*file) && pathlen > 1)
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file--;
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while (!isdirsep (*file))
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file--;
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file++;
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if (file == path)
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{
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for (int i = 0; registry_listing[i]; i++)
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if (path_prefix_p
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(registry_listing[i], path, strlen (registry_listing[i])))
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{
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if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
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{
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set_errno (EEXIST);
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res = 0;
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goto out;
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}
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else if (flags & O_WRONLY)
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{
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set_errno (EISDIR);
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res = 0;
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goto out;
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}
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else
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{
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set_io_handle (registry_keys[i]);
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flags |= O_DIROPEN;
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goto success;
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}
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}
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if (flags & O_CREAT)
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{
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set_errno (EROFS);
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res = 0;
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goto out;
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}
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else
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{
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set_errno (ENOENT);
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res = 0;
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goto out;
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}
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}
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if (flags & O_WRONLY)
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{
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set_errno (EROFS);
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res = 0;
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goto out;
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}
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handle = open_key (path, KEY_READ, wow64, false);
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if (handle == (HKEY) INVALID_HANDLE_VALUE)
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{
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handle = open_key (path, KEY_READ, wow64, true);
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if (handle == (HKEY) INVALID_HANDLE_VALUE)
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{
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res = 0;
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goto out;
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}
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}
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else
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flags |= O_DIROPEN;
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set_io_handle (handle);
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if (pathmatch (file, DEFAULT_VALUE_NAME))
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value_name = cstrdup ("");
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else
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value_name = cstrdup (file);
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if (!(flags & O_DIROPEN) && !fill_filebuf ())
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{
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RegCloseKey (handle);
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res = 0;
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goto out;
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}
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if (flags & O_APPEND)
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position = filesize;
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else
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position = 0;
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success:
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res = 1;
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set_flags ((flags & ~O_TEXT) | O_BINARY);
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|
set_open_status ();
|
|
out:
|
|
syscall_printf ("%d = fhandler_registry::open (%p, %d)", res, flags, mode);
|
|
return res;
|
|
}
|
|
|
|
int
|
|
fhandler_registry::close ()
|
|
{
|
|
int res = fhandler_virtual::close ();
|
|
if (res != 0)
|
|
return res;
|
|
HKEY handle = (HKEY) get_handle ();
|
|
if (handle != (HKEY) INVALID_HANDLE_VALUE)
|
|
{
|
|
if (RegCloseKey (handle) != ERROR_SUCCESS)
|
|
{
|
|
__seterrno ();
|
|
res = -1;
|
|
}
|
|
}
|
|
if (!hExeced && value_name)
|
|
{
|
|
cfree (value_name);
|
|
value_name = NULL;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
bool
|
|
fhandler_registry::fill_filebuf ()
|
|
{
|
|
DWORD type, size;
|
|
LONG error;
|
|
HKEY handle = (HKEY) get_handle ();
|
|
if (handle != HKEY_PERFORMANCE_DATA)
|
|
{
|
|
error = RegQueryValueEx (handle, value_name, NULL, &type, NULL, &size);
|
|
if (error != ERROR_SUCCESS)
|
|
{
|
|
if (error != ERROR_FILE_NOT_FOUND)
|
|
{
|
|
seterrno_from_win_error (__FILE__, __LINE__, error);
|
|
return false;
|
|
}
|
|
goto value_not_found;
|
|
}
|
|
bufalloc = size;
|
|
filebuf = (char *) cmalloc (HEAP_BUF, bufalloc);
|
|
error =
|
|
RegQueryValueEx (handle, value_name, NULL, NULL, (BYTE *) filebuf,
|
|
&size);
|
|
if (error != ERROR_SUCCESS)
|
|
{
|
|
seterrno_from_win_error (__FILE__, __LINE__, error);
|
|
return true;
|
|
}
|
|
filesize = size;
|
|
}
|
|
else
|
|
{
|
|
bufalloc = 0;
|
|
do
|
|
{
|
|
bufalloc += 1000;
|
|
filebuf = (char *) crealloc (filebuf, bufalloc);
|
|
size = bufalloc;
|
|
error = RegQueryValueEx (handle, value_name, NULL, &type,
|
|
(BYTE *) filebuf, &size);
|
|
if (error != ERROR_SUCCESS && error != ERROR_MORE_DATA)
|
|
{
|
|
if (error != ERROR_FILE_NOT_FOUND)
|
|
{
|
|
seterrno_from_win_error (__FILE__, __LINE__, error);
|
|
return true;
|
|
}
|
|
goto value_not_found;
|
|
}
|
|
}
|
|
while (error == ERROR_MORE_DATA);
|
|
filesize = size;
|
|
}
|
|
return true;
|
|
value_not_found:
|
|
DWORD buf_size = CYG_MAX_PATH;
|
|
char buf[buf_size];
|
|
int index = 0;
|
|
while (ERROR_SUCCESS ==
|
|
(error = RegEnumKeyEx (handle, index++, buf, &buf_size, NULL, NULL,
|
|
NULL, NULL)) || (error == ERROR_MORE_DATA))
|
|
{
|
|
if (pathmatch (buf, value_name))
|
|
{
|
|
set_errno (EISDIR);
|
|
return false;
|
|
}
|
|
buf_size = CYG_MAX_PATH;
|
|
}
|
|
if (error != ERROR_NO_MORE_ITEMS)
|
|
{
|
|
seterrno_from_win_error (__FILE__, __LINE__, error);
|
|
return false;
|
|
}
|
|
set_errno (ENOENT);
|
|
return false;
|
|
}
|
|
|
|
/* Auxillary member function to open registry keys. */
|
|
static HKEY
|
|
open_key (const char *name, REGSAM access, DWORD wow64, bool isValue)
|
|
{
|
|
HKEY hKey = (HKEY) INVALID_HANDLE_VALUE;
|
|
HKEY hParentKey = (HKEY) INVALID_HANDLE_VALUE;
|
|
bool parentOpened = false;
|
|
char component[CYG_MAX_PATH];
|
|
|
|
while (*name)
|
|
{
|
|
const char *anchor = name;
|
|
while (*name && !isdirsep (*name))
|
|
name++;
|
|
strncpy (component, anchor, name - anchor);
|
|
component[name - anchor] = '\0';
|
|
if (*name)
|
|
name++;
|
|
if (*name == 0 && isValue == true)
|
|
goto out;
|
|
|
|
if (hParentKey != (HKEY) INVALID_HANDLE_VALUE)
|
|
{
|
|
REGSAM effective_access = KEY_READ;
|
|
if ((strchr (name, '/') == NULL && isValue == true) || *name == 0)
|
|
effective_access = access;
|
|
LONG error = RegOpenKeyEx (hParentKey, component, 0,
|
|
effective_access | wow64, &hKey);
|
|
if (error == ERROR_ACCESS_DENIED) /* Try opening with backup intent */
|
|
error = RegCreateKeyEx (hParentKey, component, 0, NULL,
|
|
REG_OPTION_BACKUP_RESTORE,
|
|
effective_access | wow64, NULL,
|
|
&hKey, NULL);
|
|
if (error != ERROR_SUCCESS)
|
|
{
|
|
hKey = (HKEY) INVALID_HANDLE_VALUE;
|
|
seterrno_from_win_error (__FILE__, __LINE__, error);
|
|
return hKey;
|
|
}
|
|
if (parentOpened)
|
|
RegCloseKey (hParentKey);
|
|
hParentKey = hKey;
|
|
parentOpened = true;
|
|
}
|
|
else
|
|
{
|
|
for (int i = 0; registry_listing[i]; i++)
|
|
if (pathmatch (component, registry_listing[i]))
|
|
hKey = registry_keys[i];
|
|
if (hKey == (HKEY) INVALID_HANDLE_VALUE)
|
|
return hKey;
|
|
hParentKey = hKey;
|
|
}
|
|
}
|
|
out:
|
|
return hKey;
|
|
}
|