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reactos/drivers/filesystems/btrfs/registry.c
Victor Perevertkin 194ea909fd
[BTRFS][UBTRFS][SHELLBTRFS] Upgrade to 1.7.2 
CORE-16679
2020-04-23 07:07:36 +03:00

1038 lines
35 KiB
C
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/* Copyright (c) Mark Harmstone 2016-17
*
* This file is part of WinBtrfs.
*
* WinBtrfs is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public Licence as published by
* the Free Software Foundation, either version 3 of the Licence, or
* (at your option) any later version.
*
* WinBtrfs 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 Licence for more details.
*
* You should have received a copy of the GNU Lesser General Public Licence
* along with WinBtrfs. If not, see <http://www.gnu.org/licenses/>. */
#include "btrfs_drv.h"
#include "zstd/zstd.h"
extern UNICODE_STRING log_device, log_file, registry_path;
extern LIST_ENTRY uid_map_list, gid_map_list;
extern ERESOURCE mapping_lock;
#ifdef _DEBUG
extern HANDLE log_handle;
extern ERESOURCE log_lock;
extern PFILE_OBJECT comfo;
extern PDEVICE_OBJECT comdo;
#endif
WORK_QUEUE_ITEM wqi;
static const WCHAR option_mounted[] = L"Mounted";
NTSTATUS registry_load_volume_options(device_extension* Vcb) {
BTRFS_UUID* uuid = &Vcb->superblock.uuid;
mount_options* options = &Vcb->options;
UNICODE_STRING path, ignoreus, compressus, compressforceus, compresstypeus, readonlyus, zliblevelus, flushintervalus,
maxinlineus, subvolidus, skipbalanceus, nobarrierus, notrimus, clearcacheus, allowdegradedus, zstdlevelus,
norootdirus;
OBJECT_ATTRIBUTES oa;
NTSTATUS Status;
ULONG i, j, kvfilen, index, retlen;
KEY_VALUE_FULL_INFORMATION* kvfi = NULL;
HANDLE h;
options->compress = mount_compress;
options->compress_force = mount_compress_force;
options->compress_type = mount_compress_type > BTRFS_COMPRESSION_ZSTD ? 0 : mount_compress_type;
options->readonly = mount_readonly;
options->zlib_level = mount_zlib_level;
options->zstd_level = mount_zstd_level;
options->flush_interval = mount_flush_interval;
options->max_inline = min(mount_max_inline, Vcb->superblock.node_size - sizeof(tree_header) - sizeof(leaf_node) - sizeof(EXTENT_DATA) + 1);
options->skip_balance = mount_skip_balance;
options->no_barrier = mount_no_barrier;
options->no_trim = mount_no_trim;
options->clear_cache = mount_clear_cache;
options->allow_degraded = mount_allow_degraded;
options->subvol_id = 0;
path.Length = path.MaximumLength = registry_path.Length + (37 * sizeof(WCHAR));
path.Buffer = ExAllocatePoolWithTag(PagedPool, path.Length, ALLOC_TAG);
if (!path.Buffer) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlCopyMemory(path.Buffer, registry_path.Buffer, registry_path.Length);
i = registry_path.Length / sizeof(WCHAR);
path.Buffer[i] = '\\';
i++;
for (j = 0; j < 16; j++) {
path.Buffer[i] = hex_digit((uuid->uuid[j] & 0xF0) >> 4);
path.Buffer[i+1] = hex_digit(uuid->uuid[j] & 0xF);
i += 2;
if (j == 3 || j == 5 || j == 7 || j == 9) {
path.Buffer[i] = '-';
i++;
}
}
kvfilen = sizeof(KEY_VALUE_FULL_INFORMATION) - sizeof(WCHAR) + (255 * sizeof(WCHAR));
kvfi = ExAllocatePoolWithTag(PagedPool, kvfilen, ALLOC_TAG);
if (!kvfi) {
ERR("out of memory\n");
Status = STATUS_INSUFFICIENT_RESOURCES;
goto end;
}
InitializeObjectAttributes(&oa, &path, OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE, NULL, NULL);
Status = ZwOpenKey(&h, KEY_QUERY_VALUE, &oa);
if (Status == STATUS_OBJECT_NAME_NOT_FOUND) {
Status = STATUS_SUCCESS;
goto end;
} else if (!NT_SUCCESS(Status)) {
ERR("ZwOpenKey returned %08lx\n", Status);
goto end;
}
index = 0;
RtlInitUnicodeString(&ignoreus, L"Ignore");
RtlInitUnicodeString(&compressus, L"Compress");
RtlInitUnicodeString(&compressforceus, L"CompressForce");
RtlInitUnicodeString(&compresstypeus, L"CompressType");
RtlInitUnicodeString(&readonlyus, L"Readonly");
RtlInitUnicodeString(&zliblevelus, L"ZlibLevel");
RtlInitUnicodeString(&flushintervalus, L"FlushInterval");
RtlInitUnicodeString(&maxinlineus, L"MaxInline");
RtlInitUnicodeString(&subvolidus, L"SubvolId");
RtlInitUnicodeString(&skipbalanceus, L"SkipBalance");
RtlInitUnicodeString(&nobarrierus, L"NoBarrier");
RtlInitUnicodeString(&notrimus, L"NoTrim");
RtlInitUnicodeString(&clearcacheus, L"ClearCache");
RtlInitUnicodeString(&allowdegradedus, L"AllowDegraded");
RtlInitUnicodeString(&zstdlevelus, L"ZstdLevel");
RtlInitUnicodeString(&norootdirus, L"NoRootDir");
do {
Status = ZwEnumerateValueKey(h, index, KeyValueFullInformation, kvfi, kvfilen, &retlen);
index++;
if (NT_SUCCESS(Status)) {
UNICODE_STRING us;
us.Length = us.MaximumLength = (USHORT)kvfi->NameLength;
us.Buffer = kvfi->Name;
if (FsRtlAreNamesEqual(&ignoreus, &us, true, NULL) && kvfi->DataOffset > 0 && kvfi->DataLength > 0 && kvfi->Type == REG_DWORD) {
DWORD* val = (DWORD*)((uint8_t*)kvfi + kvfi->DataOffset);
options->ignore = *val != 0 ? true : false;
} else if (FsRtlAreNamesEqual(&compressus, &us, true, NULL) && kvfi->DataOffset > 0 && kvfi->DataLength > 0 && kvfi->Type == REG_DWORD) {
DWORD* val = (DWORD*)((uint8_t*)kvfi + kvfi->DataOffset);
options->compress = *val != 0 ? true : false;
} else if (FsRtlAreNamesEqual(&compressforceus, &us, true, NULL) && kvfi->DataOffset > 0 && kvfi->DataLength > 0 && kvfi->Type == REG_DWORD) {
DWORD* val = (DWORD*)((uint8_t*)kvfi + kvfi->DataOffset);
options->compress_force = *val != 0 ? true : false;
} else if (FsRtlAreNamesEqual(&compresstypeus, &us, true, NULL) && kvfi->DataOffset > 0 && kvfi->DataLength > 0 && kvfi->Type == REG_DWORD) {
DWORD* val = (DWORD*)((uint8_t*)kvfi + kvfi->DataOffset);
options->compress_type = (uint8_t)(*val > BTRFS_COMPRESSION_ZSTD ? 0 : *val);
} else if (FsRtlAreNamesEqual(&readonlyus, &us, true, NULL) && kvfi->DataOffset > 0 && kvfi->DataLength > 0 && kvfi->Type == REG_DWORD) {
DWORD* val = (DWORD*)((uint8_t*)kvfi + kvfi->DataOffset);
options->readonly = *val != 0 ? true : false;
} else if (FsRtlAreNamesEqual(&zliblevelus, &us, true, NULL) && kvfi->DataOffset > 0 && kvfi->DataLength > 0 && kvfi->Type == REG_DWORD) {
DWORD* val = (DWORD*)((uint8_t*)kvfi + kvfi->DataOffset);
options->zlib_level = *val;
} else if (FsRtlAreNamesEqual(&flushintervalus, &us, true, NULL) && kvfi->DataOffset > 0 && kvfi->DataLength > 0 && kvfi->Type == REG_DWORD) {
DWORD* val = (DWORD*)((uint8_t*)kvfi + kvfi->DataOffset);
options->flush_interval = *val;
} else if (FsRtlAreNamesEqual(&maxinlineus, &us, true, NULL) && kvfi->DataOffset > 0 && kvfi->DataLength > 0 && kvfi->Type == REG_DWORD) {
DWORD* val = (DWORD*)((uint8_t*)kvfi + kvfi->DataOffset);
options->max_inline = min(*val, Vcb->superblock.node_size - sizeof(tree_header) - sizeof(leaf_node) - sizeof(EXTENT_DATA) + 1);
} else if (FsRtlAreNamesEqual(&subvolidus, &us, true, NULL) && kvfi->DataOffset > 0 && kvfi->DataLength > 0 && kvfi->Type == REG_QWORD) {
uint64_t* val = (uint64_t*)((uint8_t*)kvfi + kvfi->DataOffset);
options->subvol_id = *val;
} else if (FsRtlAreNamesEqual(&skipbalanceus, &us, true, NULL) && kvfi->DataOffset > 0 && kvfi->DataLength > 0 && kvfi->Type == REG_DWORD) {
DWORD* val = (DWORD*)((uint8_t*)kvfi + kvfi->DataOffset);
options->skip_balance = *val;
} else if (FsRtlAreNamesEqual(&nobarrierus, &us, true, NULL) && kvfi->DataOffset > 0 && kvfi->DataLength > 0 && kvfi->Type == REG_DWORD) {
DWORD* val = (DWORD*)((uint8_t*)kvfi + kvfi->DataOffset);
options->no_barrier = *val;
} else if (FsRtlAreNamesEqual(&notrimus, &us, true, NULL) && kvfi->DataOffset > 0 && kvfi->DataLength > 0 && kvfi->Type == REG_DWORD) {
DWORD* val = (DWORD*)((uint8_t*)kvfi + kvfi->DataOffset);
options->no_trim = *val;
} else if (FsRtlAreNamesEqual(&clearcacheus, &us, true, NULL) && kvfi->DataOffset > 0 && kvfi->DataLength > 0 && kvfi->Type == REG_DWORD) {
DWORD* val = (DWORD*)((uint8_t*)kvfi + kvfi->DataOffset);
options->clear_cache = *val;
} else if (FsRtlAreNamesEqual(&allowdegradedus, &us, true, NULL) && kvfi->DataOffset > 0 && kvfi->DataLength > 0 && kvfi->Type == REG_DWORD) {
DWORD* val = (DWORD*)((uint8_t*)kvfi + kvfi->DataOffset);
options->allow_degraded = *val;
} else if (FsRtlAreNamesEqual(&zstdlevelus, &us, true, NULL) && kvfi->DataOffset > 0 && kvfi->DataLength > 0 && kvfi->Type == REG_DWORD) {
DWORD* val = (DWORD*)((uint8_t*)kvfi + kvfi->DataOffset);
options->zstd_level = *val;
} else if (FsRtlAreNamesEqual(&norootdirus, &us, true, NULL) && kvfi->DataOffset > 0 && kvfi->DataLength > 0 && kvfi->Type == REG_DWORD) {
DWORD* val = (DWORD*)((uint8_t*)kvfi + kvfi->DataOffset);
options->no_root_dir = *val;
}
} else if (Status != STATUS_NO_MORE_ENTRIES) {
ERR("ZwEnumerateValueKey returned %08lx\n", Status);
goto end2;
}
} while (NT_SUCCESS(Status));
if (!options->compress && options->compress_force)
options->compress = true;
if (options->zlib_level > 9)
options->zlib_level = 9;
if (options->zstd_level > (uint32_t)ZSTD_maxCLevel())
options->zstd_level = ZSTD_maxCLevel();
if (options->flush_interval == 0)
options->flush_interval = mount_flush_interval;
Status = STATUS_SUCCESS;
end2:
ZwClose(h);
end:
ExFreePool(path.Buffer);
if (kvfi)
ExFreePool(kvfi);
return Status;
}
NTSTATUS registry_mark_volume_mounted(BTRFS_UUID* uuid) {
UNICODE_STRING path, mountedus;
ULONG i, j;
NTSTATUS Status;
OBJECT_ATTRIBUTES oa;
HANDLE h;
DWORD data;
path.Length = path.MaximumLength = registry_path.Length + (37 * sizeof(WCHAR));
path.Buffer = ExAllocatePoolWithTag(PagedPool, path.Length, ALLOC_TAG);
if (!path.Buffer) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlCopyMemory(path.Buffer, registry_path.Buffer, registry_path.Length);
i = registry_path.Length / sizeof(WCHAR);
path.Buffer[i] = '\\';
i++;
for (j = 0; j < 16; j++) {
path.Buffer[i] = hex_digit((uuid->uuid[j] & 0xF0) >> 4);
path.Buffer[i+1] = hex_digit(uuid->uuid[j] & 0xF);
i += 2;
if (j == 3 || j == 5 || j == 7 || j == 9) {
path.Buffer[i] = '-';
i++;
}
}
InitializeObjectAttributes(&oa, &path, OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE, NULL, NULL);
Status = ZwCreateKey(&h, KEY_SET_VALUE, &oa, 0, NULL, REG_OPTION_NON_VOLATILE, NULL);
if (!NT_SUCCESS(Status)) {
ERR("ZwCreateKey returned %08lx\n", Status);
goto end;
}
mountedus.Buffer = (WCHAR*)option_mounted;
mountedus.Length = mountedus.MaximumLength = sizeof(option_mounted) - sizeof(WCHAR);
data = 1;
Status = ZwSetValueKey(h, &mountedus, 0, REG_DWORD, &data, sizeof(DWORD));
if (!NT_SUCCESS(Status)) {
ERR("ZwSetValueKey returned %08lx\n", Status);
goto end2;
}
Status = STATUS_SUCCESS;
end2:
ZwClose(h);
end:
ExFreePool(path.Buffer);
return Status;
}
static NTSTATUS registry_mark_volume_unmounted_path(PUNICODE_STRING path) {
HANDLE h;
OBJECT_ATTRIBUTES oa;
NTSTATUS Status;
ULONG index, kvbilen = sizeof(KEY_VALUE_BASIC_INFORMATION) - sizeof(WCHAR) + (255 * sizeof(WCHAR)), retlen;
KEY_VALUE_BASIC_INFORMATION* kvbi;
bool has_options = false;
UNICODE_STRING mountedus;
// If a volume key has any options in it, we set Mounted to 0 and return. Otherwise,
// we delete the whole thing.
kvbi = ExAllocatePoolWithTag(PagedPool, kvbilen, ALLOC_TAG);
if (!kvbi) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
InitializeObjectAttributes(&oa, path, OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE, NULL, NULL);
Status = ZwOpenKey(&h, KEY_QUERY_VALUE | KEY_SET_VALUE | DELETE, &oa);
if (!NT_SUCCESS(Status)) {
ERR("ZwOpenKey returned %08lx\n", Status);
goto end;
}
index = 0;
mountedus.Buffer = (WCHAR*)option_mounted;
mountedus.Length = mountedus.MaximumLength = sizeof(option_mounted) - sizeof(WCHAR);
do {
Status = ZwEnumerateValueKey(h, index, KeyValueBasicInformation, kvbi, kvbilen, &retlen);
index++;
if (NT_SUCCESS(Status)) {
UNICODE_STRING us;
us.Length = us.MaximumLength = (USHORT)kvbi->NameLength;
us.Buffer = kvbi->Name;
if (!FsRtlAreNamesEqual(&mountedus, &us, true, NULL)) {
has_options = true;
break;
}
} else if (Status != STATUS_NO_MORE_ENTRIES) {
ERR("ZwEnumerateValueKey returned %08lx\n", Status);
goto end2;
}
} while (NT_SUCCESS(Status));
if (has_options) {
DWORD data = 0;
Status = ZwSetValueKey(h, &mountedus, 0, REG_DWORD, &data, sizeof(DWORD));
if (!NT_SUCCESS(Status)) {
ERR("ZwSetValueKey returned %08lx\n", Status);
goto end2;
}
} else {
Status = ZwDeleteKey(h);
if (!NT_SUCCESS(Status)) {
ERR("ZwDeleteKey returned %08lx\n", Status);
goto end2;
}
}
Status = STATUS_SUCCESS;
end2:
ZwClose(h);
end:
ExFreePool(kvbi);
return Status;
}
NTSTATUS registry_mark_volume_unmounted(BTRFS_UUID* uuid) {
UNICODE_STRING path;
NTSTATUS Status;
ULONG i, j;
path.Length = path.MaximumLength = registry_path.Length + (37 * sizeof(WCHAR));
path.Buffer = ExAllocatePoolWithTag(PagedPool, path.Length, ALLOC_TAG);
if (!path.Buffer) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlCopyMemory(path.Buffer, registry_path.Buffer, registry_path.Length);
i = registry_path.Length / sizeof(WCHAR);
path.Buffer[i] = '\\';
i++;
for (j = 0; j < 16; j++) {
path.Buffer[i] = hex_digit((uuid->uuid[j] & 0xF0) >> 4);
path.Buffer[i+1] = hex_digit(uuid->uuid[j] & 0xF);
i += 2;
if (j == 3 || j == 5 || j == 7 || j == 9) {
path.Buffer[i] = '-';
i++;
}
}
Status = registry_mark_volume_unmounted_path(&path);
if (!NT_SUCCESS(Status)) {
ERR("registry_mark_volume_unmounted_path returned %08lx\n", Status);
goto end;
}
Status = STATUS_SUCCESS;
end:
ExFreePool(path.Buffer);
return Status;
}
#define is_hex(c) ((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F'))
static bool is_uuid(ULONG namelen, WCHAR* name) {
ULONG i;
if (namelen != 36 * sizeof(WCHAR))
return false;
for (i = 0; i < 36; i++) {
if (i == 8 || i == 13 || i == 18 || i == 23) {
if (name[i] != '-')
return false;
} else if (!is_hex(name[i]))
return false;
}
return true;
}
typedef struct {
UNICODE_STRING name;
LIST_ENTRY list_entry;
} key_name;
static void reset_subkeys(HANDLE h, PUNICODE_STRING reg_path) {
NTSTATUS Status;
KEY_BASIC_INFORMATION* kbi;
ULONG kbilen = sizeof(KEY_BASIC_INFORMATION) - sizeof(WCHAR) + (255 * sizeof(WCHAR)), retlen, index = 0;
LIST_ENTRY key_names, *le;
InitializeListHead(&key_names);
kbi = ExAllocatePoolWithTag(PagedPool, kbilen, ALLOC_TAG);
if (!kbi) {
ERR("out of memory\n");
return;
}
do {
Status = ZwEnumerateKey(h, index, KeyBasicInformation, kbi, kbilen, &retlen);
index++;
if (NT_SUCCESS(Status)) {
key_name* kn;
TRACE("key: %.*S\n", (int)(kbi->NameLength / sizeof(WCHAR)), kbi->Name);
if (is_uuid(kbi->NameLength, kbi->Name)) {
kn = ExAllocatePoolWithTag(PagedPool, sizeof(key_name), ALLOC_TAG);
if (!kn) {
ERR("out of memory\n");
goto end;
}
kn->name.Length = kn->name.MaximumLength = (USHORT)min(0xffff, kbi->NameLength);
kn->name.Buffer = ExAllocatePoolWithTag(PagedPool, kn->name.MaximumLength, ALLOC_TAG);
if (!kn->name.Buffer) {
ERR("out of memory\n");
ExFreePool(kn);
goto end;
}
RtlCopyMemory(kn->name.Buffer, kbi->Name, kn->name.Length);
InsertTailList(&key_names, &kn->list_entry);
}
} else if (Status != STATUS_NO_MORE_ENTRIES)
ERR("ZwEnumerateKey returned %08lx\n", Status);
} while (NT_SUCCESS(Status));
le = key_names.Flink;
while (le != &key_names) {
key_name* kn = CONTAINING_RECORD(le, key_name, list_entry);
UNICODE_STRING path;
path.Length = path.MaximumLength = reg_path->Length + sizeof(WCHAR) + kn->name.Length;
path.Buffer = ExAllocatePoolWithTag(PagedPool, path.Length, ALLOC_TAG);
if (!path.Buffer) {
ERR("out of memory\n");
goto end;
}
RtlCopyMemory(path.Buffer, reg_path->Buffer, reg_path->Length);
path.Buffer[reg_path->Length / sizeof(WCHAR)] = '\\';
RtlCopyMemory(&path.Buffer[(reg_path->Length / sizeof(WCHAR)) + 1], kn->name.Buffer, kn->name.Length);
Status = registry_mark_volume_unmounted_path(&path);
if (!NT_SUCCESS(Status))
WARN("registry_mark_volume_unmounted_path returned %08lx\n", Status);
ExFreePool(path.Buffer);
le = le->Flink;
}
end:
while (!IsListEmpty(&key_names)) {
key_name* kn;
le = RemoveHeadList(&key_names);
kn = CONTAINING_RECORD(le, key_name, list_entry);
if (kn->name.Buffer)
ExFreePool(kn->name.Buffer);
ExFreePool(kn);
}
ExFreePool(kbi);
}
static void read_mappings(PUNICODE_STRING regpath) {
WCHAR* path;
UNICODE_STRING us;
HANDLE h;
OBJECT_ATTRIBUTES oa;
ULONG dispos;
NTSTATUS Status;
static const WCHAR mappings[] = L"\\Mappings";
while (!IsListEmpty(&uid_map_list)) {
uid_map* um = CONTAINING_RECORD(RemoveHeadList(&uid_map_list), uid_map, listentry);
if (um->sid) ExFreePool(um->sid);
ExFreePool(um);
}
path = ExAllocatePoolWithTag(PagedPool, regpath->Length + sizeof(mappings) - sizeof(WCHAR), ALLOC_TAG);
if (!path) {
ERR("out of memory\n");
return;
}
RtlCopyMemory(path, regpath->Buffer, regpath->Length);
RtlCopyMemory((uint8_t*)path + regpath->Length, mappings, sizeof(mappings) - sizeof(WCHAR));
us.Buffer = path;
us.Length = us.MaximumLength = regpath->Length + sizeof(mappings) - sizeof(WCHAR);
InitializeObjectAttributes(&oa, &us, OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE, NULL, NULL);
Status = ZwCreateKey(&h, KEY_QUERY_VALUE, &oa, 0, NULL, REG_OPTION_NON_VOLATILE, &dispos);
if (!NT_SUCCESS(Status)) {
ERR("ZwCreateKey returned %08lx\n", Status);
ExFreePool(path);
return;
}
if (dispos == REG_OPENED_EXISTING_KEY) {
KEY_VALUE_FULL_INFORMATION* kvfi;
ULONG kvfilen, retlen, i;
kvfilen = sizeof(KEY_VALUE_FULL_INFORMATION) + 256;
kvfi = ExAllocatePoolWithTag(PagedPool, kvfilen, ALLOC_TAG);
if (!kvfi) {
ERR("out of memory\n");
ExFreePool(path);
ZwClose(h);
return;
}
i = 0;
do {
Status = ZwEnumerateValueKey(h, i, KeyValueFullInformation, kvfi, kvfilen, &retlen);
if (NT_SUCCESS(Status) && kvfi->DataLength > 0 && kvfi->Type == REG_DWORD) {
uint32_t val = 0;
RtlCopyMemory(&val, (uint8_t*)kvfi + kvfi->DataOffset, min(kvfi->DataLength, sizeof(uint32_t)));
TRACE("entry %lu = %.*S = %u\n", i, (int)(kvfi->NameLength / sizeof(WCHAR)), kvfi->Name, val);
add_user_mapping(kvfi->Name, kvfi->NameLength / sizeof(WCHAR), val);
}
i = i + 1;
} while (Status != STATUS_NO_MORE_ENTRIES);
ExFreePool(kvfi);
}
ZwClose(h);
ExFreePool(path);
}
static void read_group_mappings(PUNICODE_STRING regpath) {
WCHAR* path;
UNICODE_STRING us;
HANDLE h;
OBJECT_ATTRIBUTES oa;
ULONG dispos;
NTSTATUS Status;
static const WCHAR mappings[] = L"\\GroupMappings";
while (!IsListEmpty(&gid_map_list)) {
gid_map* gm = CONTAINING_RECORD(RemoveHeadList(&gid_map_list), gid_map, listentry);
if (gm->sid) ExFreePool(gm->sid);
ExFreePool(gm);
}
path = ExAllocatePoolWithTag(PagedPool, regpath->Length + sizeof(mappings) - sizeof(WCHAR), ALLOC_TAG);
if (!path) {
ERR("out of memory\n");
return;
}
RtlCopyMemory(path, regpath->Buffer, regpath->Length);
RtlCopyMemory((uint8_t*)path + regpath->Length, mappings, sizeof(mappings) - sizeof(WCHAR));
us.Buffer = path;
us.Length = us.MaximumLength = regpath->Length + sizeof(mappings) - sizeof(WCHAR);
InitializeObjectAttributes(&oa, &us, OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE, NULL, NULL);
Status = ZwCreateKey(&h, KEY_QUERY_VALUE, &oa, 0, NULL, REG_OPTION_NON_VOLATILE, &dispos);
if (!NT_SUCCESS(Status)) {
ERR("ZwCreateKey returned %08lx\n", Status);
ExFreePool(path);
return;
}
ExFreePool(path);
if (dispos == REG_OPENED_EXISTING_KEY) {
KEY_VALUE_FULL_INFORMATION* kvfi;
ULONG kvfilen, retlen, i;
kvfilen = sizeof(KEY_VALUE_FULL_INFORMATION) + 256;
kvfi = ExAllocatePoolWithTag(PagedPool, kvfilen, ALLOC_TAG);
if (!kvfi) {
ERR("out of memory\n");
ZwClose(h);
return;
}
i = 0;
do {
Status = ZwEnumerateValueKey(h, i, KeyValueFullInformation, kvfi, kvfilen, &retlen);
if (NT_SUCCESS(Status) && kvfi->DataLength > 0 && kvfi->Type == REG_DWORD) {
uint32_t val = 0;
RtlCopyMemory(&val, (uint8_t*)kvfi + kvfi->DataOffset, min(kvfi->DataLength, sizeof(uint32_t)));
TRACE("entry %lu = %.*S = %u\n", i, (int)(kvfi->NameLength / sizeof(WCHAR)), kvfi->Name, val);
add_group_mapping(kvfi->Name, kvfi->NameLength / sizeof(WCHAR), val);
}
i = i + 1;
} while (Status != STATUS_NO_MORE_ENTRIES);
ExFreePool(kvfi);
} else if (dispos == REG_CREATED_NEW_KEY) {
static const WCHAR builtin_users[] = L"S-1-5-32-545";
UNICODE_STRING us2;
DWORD val;
// If we're creating the key for the first time, we add a default mapping of
// BUILTIN\Users to gid 100, which ought to correspond to the "users" group on Linux.
us2.Length = us2.MaximumLength = sizeof(builtin_users) - sizeof(WCHAR);
us2.Buffer = ExAllocatePoolWithTag(PagedPool, us2.MaximumLength, ALLOC_TAG);
if (us2.Buffer) {
RtlCopyMemory(us2.Buffer, builtin_users, us2.Length);
val = 100;
Status = ZwSetValueKey(h, &us2, 0, REG_DWORD, &val, sizeof(DWORD));
if (!NT_SUCCESS(Status)) {
ERR("ZwSetValueKey returned %08lx\n", Status);
ZwClose(h);
return;
}
add_group_mapping(us2.Buffer, us2.Length / sizeof(WCHAR), val);
ExFreePool(us2.Buffer);
}
}
ZwClose(h);
}
static void get_registry_value(HANDLE h, WCHAR* string, ULONG type, void* val, ULONG size) {
ULONG kvfilen;
KEY_VALUE_FULL_INFORMATION* kvfi;
UNICODE_STRING us;
NTSTATUS Status;
RtlInitUnicodeString(&us, string);
kvfi = NULL;
kvfilen = 0;
Status = ZwQueryValueKey(h, &us, KeyValueFullInformation, kvfi, kvfilen, &kvfilen);
if ((Status == STATUS_BUFFER_TOO_SMALL || Status == STATUS_BUFFER_OVERFLOW) && kvfilen > 0) {
kvfi = ExAllocatePoolWithTag(PagedPool, kvfilen, ALLOC_TAG);
if (!kvfi) {
ERR("out of memory\n");
ZwClose(h);
return;
}
Status = ZwQueryValueKey(h, &us, KeyValueFullInformation, kvfi, kvfilen, &kvfilen);
if (NT_SUCCESS(Status)) {
if (kvfi->Type == type && kvfi->DataLength >= size) {
RtlCopyMemory(val, ((uint8_t*)kvfi) + kvfi->DataOffset, size);
} else {
Status = ZwDeleteValueKey(h, &us);
if (!NT_SUCCESS(Status)) {
ERR("ZwDeleteValueKey returned %08lx\n", Status);
}
Status = ZwSetValueKey(h, &us, 0, type, val, size);
if (!NT_SUCCESS(Status)) {
ERR("ZwSetValueKey returned %08lx\n", Status);
}
}
}
ExFreePool(kvfi);
} else if (Status == STATUS_OBJECT_NAME_NOT_FOUND) {
Status = ZwSetValueKey(h, &us, 0, type, val, size);
if (!NT_SUCCESS(Status)) {
ERR("ZwSetValueKey returned %08lx\n", Status);
}
} else {
ERR("ZwQueryValueKey returned %08lx\n", Status);
}
}
void read_registry(PUNICODE_STRING regpath, bool refresh) {
OBJECT_ATTRIBUTES oa;
NTSTATUS Status;
HANDLE h;
ULONG dispos;
#ifdef _DEBUG
KEY_VALUE_FULL_INFORMATION* kvfi;
ULONG kvfilen, old_debug_log_level = debug_log_level;
UNICODE_STRING us, old_log_file, old_log_device;
static const WCHAR def_log_file[] = L"\\??\\C:\\btrfs.log";
#endif
ExAcquireResourceExclusiveLite(&mapping_lock, true);
read_mappings(regpath);
read_group_mappings(regpath);
ExReleaseResourceLite(&mapping_lock);
InitializeObjectAttributes(&oa, regpath, OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE, NULL, NULL);
Status = ZwCreateKey(&h, KEY_QUERY_VALUE | KEY_ENUMERATE_SUB_KEYS, &oa, 0, NULL, REG_OPTION_NON_VOLATILE, &dispos);
if (!NT_SUCCESS(Status)) {
ERR("ZwCreateKey returned %08lx\n", Status);
return;
}
if (!refresh)
reset_subkeys(h, regpath);
get_registry_value(h, L"Compress", REG_DWORD, &mount_compress, sizeof(mount_compress));
get_registry_value(h, L"CompressForce", REG_DWORD, &mount_compress_force, sizeof(mount_compress_force));
get_registry_value(h, L"CompressType", REG_DWORD, &mount_compress_type, sizeof(mount_compress_type));
get_registry_value(h, L"ZlibLevel", REG_DWORD, &mount_zlib_level, sizeof(mount_zlib_level));
get_registry_value(h, L"FlushInterval", REG_DWORD, &mount_flush_interval, sizeof(mount_flush_interval));
get_registry_value(h, L"MaxInline", REG_DWORD, &mount_max_inline, sizeof(mount_max_inline));
get_registry_value(h, L"SkipBalance", REG_DWORD, &mount_skip_balance, sizeof(mount_skip_balance));
get_registry_value(h, L"NoBarrier", REG_DWORD, &mount_no_barrier, sizeof(mount_no_barrier));
get_registry_value(h, L"NoTrim", REG_DWORD, &mount_no_trim, sizeof(mount_no_trim));
get_registry_value(h, L"ClearCache", REG_DWORD, &mount_clear_cache, sizeof(mount_clear_cache));
get_registry_value(h, L"AllowDegraded", REG_DWORD, &mount_allow_degraded, sizeof(mount_allow_degraded));
get_registry_value(h, L"Readonly", REG_DWORD, &mount_readonly, sizeof(mount_readonly));
get_registry_value(h, L"ZstdLevel", REG_DWORD, &mount_zstd_level, sizeof(mount_zstd_level));
get_registry_value(h, L"NoRootDir", REG_DWORD, &mount_no_root_dir, sizeof(mount_no_root_dir));
if (!refresh)
get_registry_value(h, L"NoPNP", REG_DWORD, &no_pnp, sizeof(no_pnp));
if (mount_flush_interval == 0)
mount_flush_interval = 1;
#ifdef _DEBUG
get_registry_value(h, L"DebugLogLevel", REG_DWORD, &debug_log_level, sizeof(debug_log_level));
RtlInitUnicodeString(&us, L"LogDevice");
kvfi = NULL;
kvfilen = 0;
Status = ZwQueryValueKey(h, &us, KeyValueFullInformation, kvfi, kvfilen, &kvfilen);
old_log_device = log_device;
log_device.Length = log_device.MaximumLength = 0;
log_device.Buffer = NULL;
if ((Status == STATUS_BUFFER_TOO_SMALL || Status == STATUS_BUFFER_OVERFLOW) && kvfilen > 0) {
kvfi = ExAllocatePoolWithTag(PagedPool, kvfilen, ALLOC_TAG);
if (!kvfi) {
ERR("out of memory\n");
ZwClose(h);
return;
}
Status = ZwQueryValueKey(h, &us, KeyValueFullInformation, kvfi, kvfilen, &kvfilen);
if (NT_SUCCESS(Status)) {
if ((kvfi->Type == REG_SZ || kvfi->Type == REG_EXPAND_SZ) && kvfi->DataLength >= sizeof(WCHAR)) {
log_device.Length = log_device.MaximumLength = (USHORT)min(0xffff, kvfi->DataLength);
log_device.Buffer = ExAllocatePoolWithTag(PagedPool, log_device.MaximumLength, ALLOC_TAG);
if (!log_device.Buffer) {
ERR("out of memory\n");
ExFreePool(kvfi);
ZwClose(h);
return;
}
RtlCopyMemory(log_device.Buffer, ((uint8_t*)kvfi) + kvfi->DataOffset, log_device.Length);
if (log_device.Buffer[(log_device.Length / sizeof(WCHAR)) - 1] == 0)
log_device.Length -= sizeof(WCHAR);
} else {
ERR("LogDevice was type %lu, length %lu\n", kvfi->Type, kvfi->DataLength);
Status = ZwDeleteValueKey(h, &us);
if (!NT_SUCCESS(Status)) {
ERR("ZwDeleteValueKey returned %08lx\n", Status);
}
}
}
ExFreePool(kvfi);
} else if (Status != STATUS_OBJECT_NAME_NOT_FOUND) {
ERR("ZwQueryValueKey returned %08lx\n", Status);
}
ExAcquireResourceExclusiveLite(&log_lock, true);
if (refresh && (log_device.Length != old_log_device.Length || RtlCompareMemory(log_device.Buffer, old_log_device.Buffer, log_device.Length) != log_device.Length ||
(!comfo && log_device.Length > 0) || (old_debug_log_level == 0 && debug_log_level > 0) || (old_debug_log_level > 0 && debug_log_level == 0))) {
if (comfo)
ObDereferenceObject(comfo);
if (log_handle) {
ZwClose(log_handle);
log_handle = NULL;
}
comfo = NULL;
comdo = NULL;
if (log_device.Length > 0 && debug_log_level > 0) {
Status = IoGetDeviceObjectPointer(&log_device, FILE_WRITE_DATA, &comfo, &comdo);
if (!NT_SUCCESS(Status))
DbgPrint("IoGetDeviceObjectPointer returned %08lx\n", Status);
}
}
ExReleaseResourceLite(&log_lock);
if (old_log_device.Buffer)
ExFreePool(old_log_device.Buffer);
RtlInitUnicodeString(&us, L"LogFile");
kvfi = NULL;
kvfilen = 0;
Status = ZwQueryValueKey(h, &us, KeyValueFullInformation, kvfi, kvfilen, &kvfilen);
old_log_file = log_file;
if ((Status == STATUS_BUFFER_TOO_SMALL || Status == STATUS_BUFFER_OVERFLOW) && kvfilen > 0) {
kvfi = ExAllocatePoolWithTag(PagedPool, kvfilen, ALLOC_TAG);
if (!kvfi) {
ERR("out of memory\n");
ZwClose(h);
return;
}
Status = ZwQueryValueKey(h, &us, KeyValueFullInformation, kvfi, kvfilen, &kvfilen);
if (NT_SUCCESS(Status)) {
if ((kvfi->Type == REG_SZ || kvfi->Type == REG_EXPAND_SZ) && kvfi->DataLength >= sizeof(WCHAR)) {
log_file.Length = log_file.MaximumLength = (USHORT)min(0xffff, kvfi->DataLength);
log_file.Buffer = ExAllocatePoolWithTag(PagedPool, log_file.MaximumLength, ALLOC_TAG);
if (!log_file.Buffer) {
ERR("out of memory\n");
ExFreePool(kvfi);
ZwClose(h);
return;
}
RtlCopyMemory(log_file.Buffer, ((uint8_t*)kvfi) + kvfi->DataOffset, log_file.Length);
if (log_file.Buffer[(log_file.Length / sizeof(WCHAR)) - 1] == 0)
log_file.Length -= sizeof(WCHAR);
} else {
ERR("LogFile was type %lu, length %lu\n", kvfi->Type, kvfi->DataLength);
Status = ZwDeleteValueKey(h, &us);
if (!NT_SUCCESS(Status))
ERR("ZwDeleteValueKey returned %08lx\n", Status);
log_file.Length = 0;
}
} else {
ERR("ZwQueryValueKey returned %08lx\n", Status);
log_file.Length = 0;
}
ExFreePool(kvfi);
} else if (Status == STATUS_OBJECT_NAME_NOT_FOUND) {
Status = ZwSetValueKey(h, &us, 0, REG_SZ, (void*)def_log_file, sizeof(def_log_file));
if (!NT_SUCCESS(Status))
ERR("ZwSetValueKey returned %08lx\n", Status);
log_file.Length = 0;
} else {
ERR("ZwQueryValueKey returned %08lx\n", Status);
log_file.Length = 0;
}
if (log_file.Length == 0) {
log_file.Length = log_file.MaximumLength = sizeof(def_log_file) - sizeof(WCHAR);
log_file.Buffer = ExAllocatePoolWithTag(PagedPool, log_file.MaximumLength, ALLOC_TAG);
if (!log_file.Buffer) {
ERR("out of memory\n");
ZwClose(h);
return;
}
RtlCopyMemory(log_file.Buffer, def_log_file, log_file.Length);
}
ExAcquireResourceExclusiveLite(&log_lock, true);
if (refresh && (log_file.Length != old_log_file.Length || RtlCompareMemory(log_file.Buffer, old_log_file.Buffer, log_file.Length) != log_file.Length ||
(!log_handle && log_file.Length > 0) || (old_debug_log_level == 0 && debug_log_level > 0) || (old_debug_log_level > 0 && debug_log_level == 0))) {
if (log_handle) {
ZwClose(log_handle);
log_handle = NULL;
}
if (!comfo && log_file.Length > 0 && refresh && debug_log_level > 0) {
IO_STATUS_BLOCK iosb;
InitializeObjectAttributes(&oa, &log_file, OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE, NULL, NULL);
Status = ZwCreateFile(&log_handle, FILE_WRITE_DATA, &oa, &iosb, NULL, FILE_ATTRIBUTE_NORMAL, FILE_SHARE_READ,
FILE_OPEN_IF, FILE_NON_DIRECTORY_FILE | FILE_WRITE_THROUGH | FILE_SYNCHRONOUS_IO_ALERT, NULL, 0);
if (!NT_SUCCESS(Status)) {
DbgPrint("ZwCreateFile returned %08lx\n", Status);
log_handle = NULL;
}
}
}
ExReleaseResourceLite(&log_lock);
if (old_log_file.Buffer)
ExFreePool(old_log_file.Buffer);
#endif
ZwClose(h);
}
_Function_class_(WORKER_THREAD_ROUTINE)
static void __stdcall registry_work_item(PVOID Parameter) {
NTSTATUS Status;
HANDLE regh = (HANDLE)Parameter;
IO_STATUS_BLOCK iosb;
TRACE("registry changed\n");
read_registry(&registry_path, true);
Status = ZwNotifyChangeKey(regh, NULL, (PVOID)&wqi, (PVOID)DelayedWorkQueue, &iosb, REG_NOTIFY_CHANGE_LAST_SET, true, NULL, 0, true);
if (!NT_SUCCESS(Status))
ERR("ZwNotifyChangeKey returned %08lx\n", Status);
}
void watch_registry(HANDLE regh) {
NTSTATUS Status;
IO_STATUS_BLOCK iosb;
ExInitializeWorkItem(&wqi, registry_work_item, regh);
Status = ZwNotifyChangeKey(regh, NULL, (PVOID)&wqi, (PVOID)DelayedWorkQueue, &iosb, REG_NOTIFY_CHANGE_LAST_SET, true, NULL, 0, true);
if (!NT_SUCCESS(Status))
ERR("ZwNotifyChangeKey returned %08lx\n", Status);
}
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