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partition.cpp
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partition.cpp
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/*
Copyright 2013 to 2021 TeamWin
This file is part of TWRP/TeamWin Recovery Project.
TWRP 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.
TWRP 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 TWRP. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/vfs.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <iostream>
#include <libgen.h>
#include <zlib.h>
#include <sstream>
#include <android-base/properties.h>
#include <android-base/strings.h>
#include <libsnapshot/snapshot.h>
#include "cutils/properties.h"
#include "libblkid/include/blkid.h"
#include "variables.h"
#include "twcommon.h"
#include "partitions.hpp"
#include "data.hpp"
#include "twrp-functions.hpp"
#include "twrpTar.hpp"
#include "exclude.hpp"
#include "infomanager.hpp"
#include "set_metadata.h"
#include "gui/gui.hpp"
#include "adbbu/libtwadbbu.hpp"
#ifdef TW_INCLUDE_CRYPTO
// #include "crypto/fde/cryptfs.h"
#include "cryptfs.h"
#include "Decrypt.h"
#endif
extern "C" {
#include "mtdutils/mtdutils.h"
#include "mtdutils/mounts.h"
#ifdef USE_EXT4
// #include "make_ext4fs.h" TODO need ifdef for android8
#include <ext4_utils/make_ext4fs.h>
#endif
#ifdef TW_INCLUDE_CRYPTO
#include "gpt/gpt.h"
#endif
}
#include <selinux/selinux.h>
#include <selinux/label.h>
#ifdef HAVE_CAPABILITIES
#include <sys/capability.h>
#include <sys/xattr.h>
#include <linux/xattr.h>
#endif
#include <sparse_format.h>
#include "progresstracking.hpp"
#define CRYPT_FOOTER_OFFSET 0x4000
using namespace std;
static int auto_index = 0; // v2 fstab allows you to specify a mount point of "auto" with no /. These items are given a mount point of /auto* where * == auto_index
extern struct selabel_handle *selinux_handle;
extern bool datamedia;
struct flag_list {
const char *name;
unsigned long flag;
};
const struct flag_list mount_flags[] = {
{ "noatime", MS_NOATIME },
{ "noexec", MS_NOEXEC },
{ "nosuid", MS_NOSUID },
{ "nodev", MS_NODEV },
{ "nodiratime", MS_NODIRATIME },
{ "ro", MS_RDONLY },
{ "rw", 0 },
{ "remount", MS_REMOUNT },
{ "bind", MS_BIND },
{ "rec", MS_REC },
#ifdef MS_UNBINDABLE
{ "unbindable", MS_UNBINDABLE },
#endif
#ifdef MS_PRIVATE
{ "private", MS_PRIVATE },
#endif
#ifdef MS_SLAVE
{ "slave", MS_SLAVE },
#endif
#ifdef MS_SHARED
{ "shared", MS_SHARED },
#endif
{ "sync", MS_SYNCHRONOUS },
{ 0, 0 },
};
const char *ignored_mount_items[] = {
"defaults=",
"errors=",
"latemount",
"sysfs_path=",
NULL
};
enum TW_FSTAB_FLAGS {
TWFLAG_DEFAULTS, // Retain position
TWFLAG_ANDSEC,
TWFLAG_BACKUP,
TWFLAG_BACKUPNAME,
TWFLAG_BLOCKSIZE,
TWFLAG_CANBEWIPED,
TWFLAG_CANENCRYPTBACKUP,
TWFLAG_DISPLAY,
TWFLAG_ENCRYPTABLE,
TWFLAG_FILEENCRYPTION,
TWFLAG_METADATA_ENCRYPTION,
TWFLAG_FLASHIMG,
TWFLAG_FORCEENCRYPT,
TWFLAG_FSFLAGS,
TWFLAG_IGNOREBLKID,
TWFLAG_LENGTH,
TWFLAG_MOUNTTODECRYPT,
TWFLAG_QUOTA,
TWFLAG_REMOVABLE,
TWFLAG_SETTINGSSTORAGE,
TWFLAG_STORAGE,
TWFLAG_STORAGENAME,
TWFLAG_SUBPARTITIONOF,
TWFLAG_SYMLINK,
TWFLAG_USERDATAENCRYPTBACKUP,
TWFLAG_USERMRF,
TWFLAG_WIPEDURINGFACTORYRESET,
TWFLAG_WIPEINGUI,
TWFLAG_SLOTSELECT,
TWFLAG_WAIT,
TWFLAG_VERIFY,
TWFLAG_CHECK,
TWFLAG_ALTDEVICE,
TWFLAG_NOTRIM,
TWFLAG_VOLDMANAGED,
TWFLAG_FORMATTABLE,
TWFLAG_RESIZE,
TWFLAG_KEYDIRECTORY,
TWFLAG_WRAPPEDKEY,
TWFLAG_ADOPTED_MOUNT_DELAY,
TWFLAG_DM_USE_ORIGINAL_PATH,
TWFLAG_LOGICAL,
};
/* Flags without a trailing '=' are considered dual format flags and can be
* written as either 'flagname' or 'flagname=', where the character following
* the '=' is Y,y,1 for true and false otherwise.
*/
const struct flag_list tw_flags[] = {
{ "andsec", TWFLAG_ANDSEC },
{ "backup", TWFLAG_BACKUP },
{ "backupname=", TWFLAG_BACKUPNAME },
{ "blocksize=", TWFLAG_BLOCKSIZE },
{ "canbewiped", TWFLAG_CANBEWIPED },
{ "canencryptbackup", TWFLAG_CANENCRYPTBACKUP },
{ "defaults", TWFLAG_DEFAULTS },
{ "display=", TWFLAG_DISPLAY },
{ "encryptable=", TWFLAG_ENCRYPTABLE },
{ "fileencryption=", TWFLAG_FILEENCRYPTION },
{ "metadata_encryption=", TWFLAG_METADATA_ENCRYPTION },
{ "flashimg", TWFLAG_FLASHIMG },
{ "forceencrypt=", TWFLAG_FORCEENCRYPT },
{ "fsflags=", TWFLAG_FSFLAGS },
{ "ignoreblkid", TWFLAG_IGNOREBLKID },
{ "length=", TWFLAG_LENGTH },
{ "mounttodecrypt", TWFLAG_MOUNTTODECRYPT },
{ "quota", TWFLAG_QUOTA },
{ "removable", TWFLAG_REMOVABLE },
{ "settingsstorage", TWFLAG_SETTINGSSTORAGE },
{ "storage", TWFLAG_STORAGE },
{ "storagename=", TWFLAG_STORAGENAME },
{ "subpartitionof=", TWFLAG_SUBPARTITIONOF },
{ "symlink=", TWFLAG_SYMLINK },
{ "userdataencryptbackup", TWFLAG_USERDATAENCRYPTBACKUP },
{ "usermrf", TWFLAG_USERMRF },
{ "wipeduringfactoryreset", TWFLAG_WIPEDURINGFACTORYRESET },
{ "wipeingui", TWFLAG_WIPEINGUI },
{ "slotselect", TWFLAG_SLOTSELECT },
{ "wait", TWFLAG_WAIT },
{ "verify", TWFLAG_VERIFY },
{ "check", TWFLAG_CHECK },
{ "altdevice", TWFLAG_ALTDEVICE },
{ "notrim", TWFLAG_NOTRIM },
{ "voldmanaged=", TWFLAG_VOLDMANAGED },
{ "formattable", TWFLAG_FORMATTABLE },
{ "resize", TWFLAG_RESIZE },
{ "keydirectory=", TWFLAG_KEYDIRECTORY },
{ "wrappedkey", TWFLAG_WRAPPEDKEY },
{ "adopted_mount_delay=", TWFLAG_ADOPTED_MOUNT_DELAY },
{ "dm_use_original_path", TWFLAG_DM_USE_ORIGINAL_PATH },
{ "logical", TWFLAG_LOGICAL },
{ 0, 0 },
};
TWPartition::TWPartition() {
Can_Be_Mounted = false;
Can_Be_Wiped = false;
Can_Be_Backed_Up = false;
Use_Rm_Rf = false;
Wipe_During_Factory_Reset = false;
Wipe_Available_in_GUI = false;
Is_SubPartition = false;
Has_SubPartition = false;
SubPartition_Of = "";
Symlink_Path = "";
Symlink_Mount_Point = "";
Mount_Point = "";
Backup_Path = "";
Wildcard_Block_Device = false;
Sysfs_Entry = "";
Actual_Block_Device = "";
Primary_Block_Device = "";
Alternate_Block_Device = "";
Removable = false;
Is_Present = false;
Length = 0;
Size = 0;
Used = 0;
Free = 0;
Backup_Size = 0;
Can_Be_Encrypted = false;
Is_Encrypted = false;
Is_Decrypted = false;
Is_FBE = false;
Mount_To_Decrypt = false;
Decrypted_Block_Device = "";
Display_Name = "";
Backup_Display_Name = "";
Storage_Name = "";
Backup_Name = "";
Backup_FileName = "";
MTD_Name = "";
Backup_Method = BM_NONE;
Can_Encrypt_Backup = false;
Use_Userdata_Encryption = false;
Has_Data_Media = false;
Has_Android_Secure = false;
Is_Storage = false;
Is_Settings_Storage = false;
Storage_Path = "";
Current_File_System = "";
Fstab_File_System = "";
Mount_Flags = 0;
Mount_Options = "";
Format_Block_Size = 0;
Ignore_Blkid = false;
Crypto_Key_Location = "";
MTP_Storage_ID = 0;
Can_Flash_Img = false;
Mount_Read_Only = false;
Is_Adopted_Storage = false;
Adopted_GUID = "";
SlotSelect = false;
Key_Directory = "";
Is_Super = false;
Adopted_Mount_Delay = 0;
Original_Path = "";
Use_Original_Path = false;
}
TWPartition::~TWPartition(void) {
// Do nothing
}
bool TWPartition::Process_Fstab_Line(const char *fstab_line, bool Display_Error, std::map<string, Flags_Map> *twrp_flags) {
char full_line[MAX_FSTAB_LINE_LENGTH];
char twflags[MAX_FSTAB_LINE_LENGTH] = "";
char* ptr;
int line_len = strlen(fstab_line), index = 0, item_index = 0;
bool skip = false;
int fstab_version = 1, mount_point_index = 0, fs_index = 1, block_device_index = 2;
TWPartition *additional_entry = NULL;
std::map<string, Flags_Map>::iterator it;
strlcpy(full_line, fstab_line, sizeof(full_line));
for (index = 0; index < line_len; index++) {
if (full_line[index] == 34)
skip = !skip;
if (!skip && full_line[index] <= 32)
full_line[index] = '\0';
}
if (line_len < 10)
return false; // There can't possibly be a valid fstab line that is less than 10 chars
if (fstab_line[0] == '#')
return false; // skip comments
if (strncmp(fstab_line, "/dev/", strlen("/dev/")) == 0 || strncmp(fstab_line, "/devices/", strlen("/devices/")) == 0) {
fstab_version = 2;
block_device_index = 0;
mount_point_index = 1;
fs_index = 2;
}
if (fstab_line[0] != '/') {
block_device_index = 0;
fstab_version = 2;
mount_point_index = 1;
fs_index = 2;
}
index = 0;
while (index < line_len) {
while (index < line_len && full_line[index] == '\0')
index++;
if (index >= line_len)
continue;
ptr = full_line + index;
if (item_index == mount_point_index) {
Mount_Point = ptr;
if (fstab_version == 2 && Is_Super == false) {
additional_entry = PartitionManager.Find_Partition_By_Path(Mount_Point);
if (additional_entry) {
LOGINFO("Found an additional entry for '%s'\n", Mount_Point.c_str());
}
}
LOGINFO("Processing '%s'\n", Mount_Point.c_str());
Backup_Path = Mount_Point;
Storage_Path = Mount_Point;
Display_Name = ptr + 1;
Backup_Display_Name = Display_Name;
Storage_Name = Display_Name;
item_index++;
} else if (item_index == fs_index) {
// File System
Fstab_File_System = ptr;
Current_File_System = ptr;
item_index++;
} else if (item_index == block_device_index) {
// Primary Block Device
if (Fstab_File_System == "mtd" || Fstab_File_System == "yaffs2") {
MTD_Name = ptr;
Find_MTD_Block_Device(MTD_Name);
} else if (Fstab_File_System == "bml") {
if (Mount_Point == "/boot")
MTD_Name = "boot";
else if (Mount_Point == "/recovery")
MTD_Name = "recovery";
Primary_Block_Device = ptr;
if (*ptr != '/')
LOGERR("Until we get better BML support, you will have to find and provide the full block device path to the BML devices e.g. /dev/block/bml9 instead of the partition name\n");
} else {
Primary_Block_Device = ptr;
if (*ptr == '/')
Find_Real_Block_Device(Primary_Block_Device, Display_Error);
}
item_index++;
} else if (item_index > 2) {
if (fstab_version == 2) {
if (item_index == 3) {
Process_FS_Flags(ptr);
if (additional_entry) {
additional_entry->Save_FS_Flags(Fstab_File_System, Mount_Flags, Mount_Options);
return false; // We save the extra fs flags in the other partition entry and by returning false, this entry will be deleted
}
} else {
strlcpy(twflags, ptr, sizeof(twflags));
}
item_index++;
} else if (*ptr == '/') { // v2 fstab does not allow alternate block devices
// Alternate Block Device
Alternate_Block_Device = ptr;
Find_Real_Block_Device(Alternate_Block_Device, Display_Error);
} else if (strlen(ptr) > 7 && strncmp(ptr, "length=", 7) == 0) {
// Partition length
ptr += 7;
Length = atoi(ptr);
} else if (strlen(ptr) > 6 && strncmp(ptr, "flags=", 6) == 0) {
// Custom flags, save for later so that new values aren't overwritten by defaults
ptr += 6;
strlcpy(twflags, ptr, sizeof(twflags));
} else if (strlen(ptr) == 4 && (strncmp(ptr, "NULL", 4) == 0 || strncmp(ptr, "null", 4) == 0 || strncmp(ptr, "null", 4) == 0)) {
// Do nothing
} else {
// Unhandled data
LOGINFO("Unhandled fstab information '%s' in fstab line '%s'\n", ptr, fstab_line);
}
}
while (index < line_len && full_line[index] != '\0')
index++;
}
// override block devices from the v2 fstab with the ones we read from the twrp.flags file in case they are different
if (fstab_version == 2 && twrp_flags && twrp_flags->size() > 0) {
it = twrp_flags->find(Mount_Point);
if (it != twrp_flags->end()) {
if (!it->second.Primary_Block_Device.empty()) {
Primary_Block_Device = it->second.Primary_Block_Device;
Find_Real_Block_Device(Primary_Block_Device, Display_Error);
}
if (!it->second.Alternate_Block_Device.empty()) {
Alternate_Block_Device = it->second.Alternate_Block_Device;
Find_Real_Block_Device(Alternate_Block_Device, Display_Error);
}
}
}
if (strncmp(fstab_line, "/devices/", strlen("/devices/")) == 0) {
Sysfs_Entry = Primary_Block_Device;
Primary_Block_Device = "";
Is_Storage = true;
Removable = true;
Wipe_Available_in_GUI = true;
Wildcard_Block_Device = true;
}
if (Primary_Block_Device.find("*") != string::npos)
Wildcard_Block_Device = true;
if (Mount_Point == "auto") {
Mount_Point = "/auto";
char autoi[5];
sprintf(autoi, "%i", auto_index);
Mount_Point += autoi;
Backup_Path = Mount_Point;
Storage_Path = Mount_Point;
Backup_Name = Mount_Point.substr(1);
auto_index++;
Setup_File_System(Display_Error);
Display_Name = "Storage";
Backup_Display_Name = Display_Name;
Storage_Name = Display_Name;
Can_Be_Backed_Up = false;
Wipe_Available_in_GUI = true;
Is_Storage = true;
Removable = true;
Wipe_Available_in_GUI = true;
} else if (!Is_File_System(Fstab_File_System) && !Is_Image(Fstab_File_System)) {
if (Display_Error)
LOGERR("Unknown File System: '%s'\n", Fstab_File_System.c_str());
else
LOGINFO("Unknown File System: '%s'\n", Fstab_File_System.c_str());
return false;
} else if (Is_File_System(Fstab_File_System)) {
Find_Actual_Block_Device();
Setup_File_System(Display_Error);
Backup_Name = Display_Name = Mount_Point.substr(1, Mount_Point.size() - 1);
if (Mount_Point == "/" || Mount_Point == "/system" || Mount_Point == "/system_root") {
Mount_Point = PartitionManager.Get_Android_Root_Path();
Backup_Path = Mount_Point;
Storage_Path = Mount_Point;
Display_Name = "System";
Backup_Name = "system";
Backup_Display_Name = Display_Name;
Storage_Name = Display_Name;
Wipe_Available_in_GUI = false;
Can_Be_Backed_Up = false;
Can_Be_Wiped = false;
Make_Dir(PartitionManager.Get_Android_Root_Path(), true);
} else if (Mount_Point == "/system_ext") {
Display_Name = "System_EXT";
Backup_Name = "System_EXT";
Backup_Display_Name = Display_Name;
Storage_Name = Display_Name;
Can_Be_Backed_Up = Wipe_Available_in_GUI = Is_Super ? false : true;
} else if (Mount_Point == "/product") {
Display_Name = "Product";
Backup_Name = "Product";
Backup_Display_Name = Display_Name;
Storage_Name = Display_Name;
Can_Be_Backed_Up = Wipe_Available_in_GUI = Is_Super ? false : true;
} else if (Mount_Point == "/odm") {
Display_Name = "ODM";
Backup_Name = "ODM";
Backup_Display_Name = Display_Name;
Storage_Name = Display_Name;
Can_Be_Backed_Up = Wipe_Available_in_GUI = Is_Super ? false : true;
} else if (Mount_Point == "/data") {
Display_Name = "Data";
Backup_Display_Name = Display_Name;
Storage_Name = Display_Name;
Wipe_Available_in_GUI = true;
Wipe_During_Factory_Reset = true;
Can_Be_Backed_Up = true;
Can_Encrypt_Backup = true;
Use_Userdata_Encryption = true;
} else if (Mount_Point == "/cache") {
Display_Name = "Cache";
Backup_Display_Name = Display_Name;
Storage_Name = Display_Name;
Wipe_Available_in_GUI = true;
Wipe_During_Factory_Reset = true;
Can_Be_Backed_Up = true;
} else if (Mount_Point == "/datadata") {
Wipe_During_Factory_Reset = true;
Display_Name = "DataData";
Backup_Display_Name = Display_Name;
Storage_Name = Display_Name;
Is_SubPartition = true;
SubPartition_Of = "/data";
DataManager::SetValue(TW_HAS_DATADATA, 1);
Can_Be_Backed_Up = true;
Can_Encrypt_Backup = true;
Use_Userdata_Encryption = false; // This whole partition should be encrypted
} else if (Mount_Point == "/sd-ext") {
Wipe_During_Factory_Reset = true;
Display_Name = "SD-Ext";
Backup_Display_Name = Display_Name;
Storage_Name = Display_Name;
Wipe_Available_in_GUI = true;
Removable = true;
Can_Be_Backed_Up = true;
Can_Encrypt_Backup = true;
Use_Userdata_Encryption = true;
} else if (Mount_Point == "/boot") {
Display_Name = "Boot";
Backup_Display_Name = Display_Name;
DataManager::SetValue("tw_boot_is_mountable", 1);
Can_Be_Backed_Up = true;
} else if (Mount_Point == "/vendor") {
Display_Name = "Vendor";
Backup_Display_Name = Display_Name;
Storage_Name = Display_Name;
}
#ifdef TW_EXTERNAL_STORAGE_PATH
if (Mount_Point == EXPAND(TW_EXTERNAL_STORAGE_PATH)) {
Is_Storage = true;
Storage_Path = EXPAND(TW_EXTERNAL_STORAGE_PATH);
Removable = true;
Wipe_Available_in_GUI = true;
#else
if (Mount_Point == "/sdcard" || Mount_Point == "/external_sd" || Mount_Point == "/external_sdcard") {
Is_Storage = true;
Removable = true;
Wipe_Available_in_GUI = true;
#endif
}
#ifdef TW_INTERNAL_STORAGE_PATH
if (Mount_Point == EXPAND(TW_INTERNAL_STORAGE_PATH)) {
Is_Storage = true;
Is_Settings_Storage = true;
Storage_Path = EXPAND(TW_INTERNAL_STORAGE_PATH);
Wipe_Available_in_GUI = true;
}
#else
if (Mount_Point == "/emmc" || Mount_Point == "/internal_sd" || Mount_Point == "/internal_sdcard") {
Is_Storage = true;
Is_Settings_Storage = true;
Wipe_Available_in_GUI = true;
}
#endif
} else if (Is_Image(Fstab_File_System)) {
Find_Actual_Block_Device();
Setup_Image();
if (Mount_Point == "/boot") {
Display_Name = "Boot";
Backup_Display_Name = Display_Name;
Can_Be_Backed_Up = true;
Can_Flash_Img = true;
} else if (Mount_Point == "/recovery") {
Display_Name = "Recovery";
Backup_Display_Name = Display_Name;
Can_Flash_Img = true;
} else if (Mount_Point == "/system_image") {
Display_Name = "System Image";
Backup_Display_Name = Display_Name;
Can_Flash_Img = true;
Can_Be_Backed_Up = true;
} else if (Mount_Point == "/vendor_image") {
Display_Name = "Vendor Image";
Backup_Display_Name = Display_Name;
Can_Flash_Img = true;
Can_Be_Backed_Up = true;
}
}
// Process TWRP fstab flags
if (strlen(twflags) > 0) {
string Prev_Display_Name = Display_Name;
string Prev_Storage_Name = Storage_Name;
string Prev_Backup_Display_Name = Backup_Display_Name;
Display_Name = "";
Storage_Name = "";
Backup_Display_Name = "";
Process_TW_Flags(twflags, (fstab_version == 1), fstab_version);
Save_FS_Flags(Fstab_File_System, Mount_Flags, Mount_Options);
bool has_display_name = !Display_Name.empty();
bool has_storage_name = !Storage_Name.empty();
bool has_backup_name = !Backup_Display_Name.empty();
if (!has_display_name) Display_Name = Prev_Display_Name;
if (!has_storage_name) Storage_Name = Prev_Storage_Name;
if (!has_backup_name) Backup_Display_Name = Prev_Backup_Display_Name;
if (has_display_name && !has_storage_name)
Storage_Name = Display_Name;
if (!has_display_name && has_storage_name)
Display_Name = Storage_Name;
if (has_display_name && !has_backup_name && Backup_Display_Name != "Android Secure")
Backup_Display_Name = Display_Name;
if (!has_display_name && has_backup_name)
Display_Name = Backup_Display_Name;
}
if (fstab_version == 2 && twrp_flags && twrp_flags->size() > 0) {
it = twrp_flags->find(Mount_Point);
if (it != twrp_flags->end()) {
char twrpflags[MAX_FSTAB_LINE_LENGTH] = "";
int skip = 0;
string Flags = it->second.Flags;
strcpy(twrpflags, Flags.c_str());
if (strlen(twrpflags) > strlen("flags=") && strncmp(twrpflags, "flags=", strlen("flags=")) == 0)
skip += strlen("flags=");
char* flagptr = twrpflags;
flagptr += skip;
Process_TW_Flags(flagptr, Display_Error, 1); // Forcing the fstab to ver 1 because this data is coming from the /etc/twrp.flags which should be using the TWRP v1 flags format
}
}
if (Mount_Point == "/persist" && Can_Be_Mounted) {
bool mounted = Is_Mounted();
if (mounted || Mount(false)) {
TWFunc::Fixup_Time_On_Boot("/persist/time/");
if (!mounted)
UnMount(false);
}
}
return true;
}
void TWPartition::Partition_Post_Processing(bool Display_Error) {
if (Mount_Point == "/data")
Setup_Data_Partition(Display_Error);
else if (Mount_Point == "/cache")
Setup_Cache_Partition(Display_Error);
}
void TWPartition::ExcludeAll(const string& path) {
backup_exclusions.add_absolute_dir(path);
wipe_exclusions.add_absolute_dir(path);
}
void TWPartition::Setup_Data_Partition(bool Display_Error) {
if (Mount_Point != "/data")
return;
// Ensure /data is not mounted as tmpfs for qcom hardware decrypt
UnMount(false);
#ifdef TW_INCLUDE_CRYPTO
Can_Be_Encrypted = true;
char crypto_blkdev[255];
property_get("ro.crypto.fs_crypto_blkdev", crypto_blkdev, "error");
if (strcmp(crypto_blkdev, "error") != 0) {
Set_FBE_Status();
Decrypted_Block_Device = crypto_blkdev;
LOGINFO("Data already decrypted, new block device: '%s'\n", crypto_blkdev);
if (datamedia)
Setup_Data_Media();
DataManager::SetValue(TW_IS_ENCRYPTED, 0);
} else if (!Mount(false)) {
if (Is_Present) {
if (Key_Directory.empty()) {
set_partition_data(Use_Original_Path ? Original_Path.c_str() : Actual_Block_Device.c_str(), Crypto_Key_Location.c_str());
if (cryptfs_check_footer() == 0) {
Is_Encrypted = true;
Is_Decrypted = false;
Can_Be_Mounted = false;
Current_File_System = "emmc";
Setup_Image();
DataManager::SetValue(TW_CRYPTO_PWTYPE, cryptfs_get_password_type());
DataManager::SetValue("tw_crypto_pwtype_0", cryptfs_get_password_type());
DataManager::SetValue(TW_CRYPTO_PASSWORD, "");
DataManager::SetValue("tw_crypto_display", "");
if (datamedia)
Setup_Data_Media();
} else {
gui_err("mount_data_footer=Could not mount /data and unable to find crypto footer.");
}
} else {
Is_Encrypted = true;
Is_Decrypted = false;
if (datamedia)
Setup_Data_Media();
}
} else if (Key_Directory.empty()) {
LOGERR("Primary block device '%s' for mount point '%s' is not present!\n",
Primary_Block_Device.c_str(), Mount_Point.c_str());
}
} else {
Set_FBE_Status();
int is_device_fbe;
DataManager::GetValue(TW_IS_FBE, is_device_fbe);
char crypto_state[255];
property_get("ro.crypto.state", crypto_state, "error");
if (!Decrypt_FBE_DE() && strcmp(crypto_state, "error") != 0) {
if (is_device_fbe == 1)
LOGERR("Unable to decrypt FBE device\n");
} else {
DataManager::SetValue(TW_IS_ENCRYPTED, 0);
if (datamedia)
Setup_Data_Media();
}
}
if (datamedia && (!Is_Encrypted || (Is_Encrypted && Is_Decrypted))) {
Setup_Data_Media();
Recreate_Media_Folder();
}
#else
if (datamedia) {
Setup_Data_Media();
Recreate_Media_Folder();
}
#endif
}
void TWPartition::Set_FBE_Status() {
DataManager::SetValue(TW_IS_DECRYPTED, 1);
Is_Encrypted = true;
Is_Decrypted = true;
if (Key_Directory.empty()) {
Is_FBE = false;
DataManager::SetValue(TW_IS_FBE, 0);
} else {
LOGINFO("Setup_Data_Partition::Key_Directory::%s\n", Key_Directory.c_str());
Is_FBE = true;
DataManager::SetValue(TW_IS_FBE, 1);
}
}
bool TWPartition::Decrypt_FBE_DE() {
if (TWFunc::Path_Exists("/data/unencrypted/key/version")) {
DataManager::SetValue(TW_IS_FBE, 1);
PartitionManager.Set_Crypto_State();
PartitionManager.Set_Crypto_Type("file");
LOGINFO("File Based Encryption is present\n");
#ifdef TW_INCLUDE_FBE
Is_FBE = true;
ExcludeAll(Mount_Point + "/convert_fbe");
ExcludeAll(Mount_Point + "/unencrypted");
ExcludeAll(Mount_Point + "/misc/vold/user_keys");
ExcludeAll(Mount_Point + "/misc/vold/volume_keys");
ExcludeAll(Mount_Point + "/system/gatekeeper.password.key");
ExcludeAll(Mount_Point + "/system/gatekeeper.pattern.key");
ExcludeAll(Mount_Point + "/system/locksettings.db");
ExcludeAll(Mount_Point + "/system/locksettings.db-wal");
ExcludeAll(Mount_Point + "/misc/gatekeeper");
ExcludeAll(Mount_Point + "/misc/keystore");
ExcludeAll(Mount_Point + "/drm/kek.dat");
ExcludeAll(Mount_Point + "/system_de/0/spblob"); // contains data needed to decrypt synthetic password
ExcludeAll(Mount_Point + "/system/users/0/gatekeeper.password.key");
ExcludeAll(Mount_Point + "/system/users/0/gatekeeper.pattern.key");
ExcludeAll(Mount_Point + "/cache");
ExcludeAll(Mount_Point + "/per_boot"); // removed each boot by init
ExcludeAll(Mount_Point + "/gsi"); // cow devices
int retry_count = 3;
while (!android::keystore::Decrypt_DE() && --retry_count)
usleep(2000);
if (retry_count > 0) {
PartitionManager.Set_Crypto_State();
Is_Encrypted = true;
Is_Decrypted = false;
DataManager::SetValue(TW_IS_ENCRYPTED, 1);
string filename;
int pwd_type = android::keystore::Get_Password_Type(0, filename);
if (pwd_type < 0) {
LOGERR("This TWRP does not have synthetic password decrypt support\n");
pwd_type = 0; // default password
}
PartitionManager.Parse_Users(); // after load_all_de_keys() to parse_users
std::vector<users_struct>::iterator iter;
std::vector<users_struct>* userList = PartitionManager.Get_Users_List();
for (iter = userList->begin(); iter != userList->end(); iter++) {
if (atoi((*iter).userId.c_str()) != 0) {
ExcludeAll(Mount_Point + "/system_de/" + (*iter).userId + "/spblob");
ExcludeAll(Mount_Point + "/system/users/" + (*iter).userId + "/gatekeeper.password.key");
ExcludeAll(Mount_Point + "/system/users/" + (*iter).userId + "/gatekeeper.pattern.key");
ExcludeAll(Mount_Point + "/system/users/" + (*iter).userId + "/locksettings.db");
ExcludeAll(Mount_Point + "/system/users/" + (*iter).userId + "/locksettings.db-wal");
}
}
DataManager::SetValue(TW_CRYPTO_PWTYPE, pwd_type);
DataManager::SetValue("tw_crypto_pwtype_0", pwd_type);
DataManager::SetValue(TW_CRYPTO_PASSWORD, "");
DataManager::SetValue("tw_crypto_display", "");
return true;
}
#else
LOGERR("FBE found but FBE support not present in TWRP\n");
#endif
}
DataManager::SetValue(TW_IS_FBE, 0);
return false;
}
void TWPartition::Setup_Cache_Partition(bool Display_Error __unused) {
if (Mount_Point != "/cache")
return;
if (!Mount(true))
return;
if (!TWFunc::Path_Exists("/cache/recovery/.")) {
LOGINFO("Recreating /cache/recovery folder\n");
if (mkdir("/cache/recovery", S_IRWXU | S_IRWXG | S_IWGRP | S_IXGRP) != 0)
LOGERR("Could not create /cache/recovery\n");
}
}
void TWPartition::Process_FS_Flags(const char *str) {
char *options = strdup(str);
char *ptr, *savep;
Mount_Options = "";
// Avoid issues with potentially nested strtok by using strtok_r
for (ptr = strtok_r(options, ",", &savep); ptr; ptr = strtok_r(NULL, ",", &savep)) {
char *equals = strstr(ptr, "=");
size_t name_len;
if (!equals)
name_len = strlen(ptr);
else
name_len = equals - ptr;
// There are some flags that we want to ignore in TWRP
bool found_match = false;
for (const char** ignored_mount_item = ignored_mount_items; *ignored_mount_item; ignored_mount_item++) {
if (strncmp(ptr, *ignored_mount_item, name_len) == 0) {
found_match = true;
break;
}
}
if (found_match)
continue;
// mount_flags are never postfixed by '='
if (!equals) {
const struct flag_list* mount_flag = mount_flags;
for (; mount_flag->name; mount_flag++) {
if (strcmp(ptr, mount_flag->name) == 0) {
if (mount_flag->flag == MS_RDONLY)
Mount_Read_Only = true;
else
Mount_Flags |= (unsigned)mount_flag->flag;
found_match = true;
break;
}
}
if (found_match)
continue;
}
// If we aren't ignoring this flag and it's not a mount flag, then it must be a mount option
if (!Mount_Options.empty())
Mount_Options += ",";
Mount_Options += ptr;
}
free(options);
}
void TWPartition::Save_FS_Flags(const string& local_File_System, int local_Mount_Flags, const string& local_Mount_Options) {
partition_fs_flags_struct flags;
flags.File_System = local_File_System;
flags.Mount_Flags = local_Mount_Flags;
flags.Mount_Options = local_Mount_Options;
fs_flags.push_back(flags);
}
void TWPartition::Apply_TW_Flag(const unsigned flag, const char* str, const bool val) {
switch (flag) {
case TWFLAG_ANDSEC:
Has_Android_Secure = val;
break;
case TWFLAG_BACKUP:
Can_Be_Backed_Up = val;
break;
case TWFLAG_BACKUPNAME:
Backup_Display_Name = str;
break;
case TWFLAG_BLOCKSIZE:
Format_Block_Size = (unsigned long)(atol(str));
break;
case TWFLAG_CANBEWIPED:
Can_Be_Wiped = val;
break;
case TWFLAG_CANENCRYPTBACKUP:
Can_Encrypt_Backup = val;
break;
case TWFLAG_DEFAULTS:
case TWFLAG_WAIT:
case TWFLAG_VERIFY:
case TWFLAG_CHECK:
case TWFLAG_NOTRIM:
case TWFLAG_VOLDMANAGED:
case TWFLAG_RESIZE:
// Do nothing
break;
case TWFLAG_DISPLAY:
Display_Name = str;
break;
case TWFLAG_ENCRYPTABLE:
case TWFLAG_FORCEENCRYPT:
Crypto_Key_Location = str;
break;
case TWFLAG_FILEENCRYPTION:
// This flag isn't used by TWRP but is needed in 9.0 FBE decrypt
// fileencryption=ice:aes-256-heh
{
std::string FBE = str;
size_t colon_loc = FBE.find(":");
if (colon_loc == std::string::npos) {
property_set("fbe.contents", FBE.c_str());
property_set("fbe.filenames", "");
LOGINFO("FBE contents '%s', filenames ''\n", FBE.c_str());
break;
}
std::string FBE_contents, FBE_filenames;
FBE_contents = FBE.substr(0, colon_loc);
FBE_filenames = FBE.substr(colon_loc + 1);
property_set("fbe.contents", FBE_contents.c_str());
property_set("fbe.filenames", FBE_filenames.c_str());
LOGINFO("FBE contents '%s', filenames '%s'\n", FBE_contents.c_str(), FBE_filenames.c_str());
}
break;
case TWFLAG_METADATA_ENCRYPTION:
// This flag isn't used by TWRP but is needed for FBEv2 metadata decryption
// metadata_encryption=aes-256-xts:wrappedkey_v0
{
std::string META = str;
size_t colon_loc = META.find(":");
if (colon_loc == std::string::npos) {
property_set("metadata.contents", META.c_str());
property_set("metadata.filenames", "");
LOGINFO("Metadata contents '%s', filenames ''\n", META.c_str());
break;
}
std::string META_contents, META_filenames;
META_contents = META.substr(0, colon_loc);
META_filenames = META.substr(colon_loc + 1);
property_set("metadata.contents", META_contents.c_str());
property_set("metadata.filenames", META_filenames.c_str());
LOGINFO("Metadata contents '%s', filenames '%s'\n", META_contents.c_str(), META_filenames.c_str());
}
break;
case TWFLAG_WRAPPEDKEY:
// no more processing needed. leaving it here in case we want to do something in the future
break;
case TWFLAG_FLASHIMG:
Can_Flash_Img = val;
break;
case TWFLAG_FSFLAGS:
Process_FS_Flags(str);
break;
case TWFLAG_IGNOREBLKID:
Ignore_Blkid = val;
break;
case TWFLAG_LENGTH:
Length = atoi(str);
break;
case TWFLAG_MOUNTTODECRYPT:
Mount_To_Decrypt = val;
break;
case TWFLAG_QUOTA:
// Filesystem flag - TWRP does not need to process
break;
case TWFLAG_REMOVABLE:
Removable = val;
break;
case TWFLAG_SETTINGSSTORAGE:
Is_Settings_Storage = val;
if (Is_Settings_Storage)
Is_Storage = true;
break;
case TWFLAG_STORAGE:
Is_Storage = val;
break;
case TWFLAG_STORAGENAME:
Storage_Name = str;
break;