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exfiltrate backup instead of restoring
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app/src/main/java/com/stevesoltys/seedvault/restore/RestoreExfiltrator.kt
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/* | ||
* SPDX-FileCopyrightText: 2024 The Calyx Institute | ||
* SPDX-License-Identifier: Apache-2.0 | ||
*/ | ||
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package com.stevesoltys.seedvault.restore | ||
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import android.content.Context | ||
import android.util.Log | ||
import com.stevesoltys.seedvault.crypto.Crypto | ||
import com.stevesoltys.seedvault.header.HeaderReader | ||
import com.stevesoltys.seedvault.header.VERSION | ||
import com.stevesoltys.seedvault.header.getADForFull | ||
import com.stevesoltys.seedvault.header.getADForKV | ||
import com.stevesoltys.seedvault.metadata.BackupType | ||
import com.stevesoltys.seedvault.metadata.PackageMetadata | ||
import com.stevesoltys.seedvault.plugins.StoragePluginManager | ||
import org.koin.core.component.KoinComponent | ||
import org.koin.core.component.inject | ||
import java.io.File | ||
import java.io.FileNotFoundException | ||
import java.io.OutputStream | ||
import java.util.zip.GZIPInputStream | ||
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class RestoreExfiltrator( | ||
private val context: Context, | ||
private val storagePluginManager: StoragePluginManager, | ||
) : KoinComponent { | ||
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private val headerReader: HeaderReader by inject() | ||
private val crypto: Crypto by inject() | ||
private val plugin get() = storagePluginManager.appPlugin | ||
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suspend fun ex(b: RestorableBackup) { | ||
b.packageMetadataMap.forEach { (packageName, metadata) -> | ||
try { | ||
when (metadata.backupType) { | ||
BackupType.FULL -> exFull(b.token, b.version, b.salt, packageName, metadata) | ||
BackupType.KV -> exKv(b.token, b.version, b.salt, packageName, metadata) | ||
else -> Log.e("TEST", "Ignoring $packageName was ${metadata.state}") | ||
} | ||
} catch (e: Exception) { | ||
if (e is FileNotFoundException) { | ||
Log.e("TEST", "$packageName had no backup $metadata") | ||
} else { | ||
Log.e("TEST", "ERROR restoring $packageName $metadata", e) | ||
} | ||
} | ||
} | ||
Log.e("TEST", "DONE!!!") | ||
} | ||
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private suspend fun exKv( | ||
token: Long, | ||
version: Byte, | ||
salt: String, | ||
packageName: String, | ||
metadata: PackageMetadata, | ||
) { | ||
val name = crypto.getNameForPackage(salt, packageName) | ||
plugin.getInputStream(token, name).use { inputStream -> | ||
headerReader.readVersion(inputStream, version) | ||
val ad = getADForKV(VERSION, packageName) | ||
crypto.newDecryptingStream(inputStream, ad).use { decryptedStream -> | ||
GZIPInputStream(decryptedStream).use { gzipStream -> | ||
getOutputStream(packageName).use { outputStream -> | ||
gzipStream.copyTo(outputStream) | ||
} | ||
} | ||
} | ||
} | ||
if (metadata.hasApk()) exApks(token, salt, packageName, metadata) | ||
} | ||
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private suspend fun exFull( | ||
token: Long, | ||
version: Byte, | ||
salt: String, | ||
packageName: String, | ||
metadata: PackageMetadata, | ||
) { | ||
val name = crypto.getNameForPackage(salt, packageName) | ||
val inputStream = plugin.getInputStream(token, name) | ||
val v = headerReader.readVersion(inputStream, version) | ||
val ad = getADForFull(v, packageName) | ||
crypto.newDecryptingStream(inputStream, ad).use { | ||
getOutputStream(packageName).use { outputStream -> | ||
it.copyTo(outputStream) | ||
} | ||
} | ||
if (metadata.hasApk()) exApks(token, salt, packageName, metadata) | ||
} | ||
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private suspend fun exApks( | ||
token: Long, | ||
salt: String, | ||
packageName: String, | ||
metadata: PackageMetadata, | ||
) { | ||
val apkName = crypto.getNameForApk(salt, packageName, "") | ||
val version = metadata.version?.toString() ?: error("no version") | ||
plugin.getInputStream(token, apkName).use { | ||
getOutputStream("apk-$packageName", version).use { outputStream -> | ||
it.copyTo(outputStream) | ||
} | ||
} | ||
metadata.splits?.forEach { split -> | ||
val splitName = crypto.getNameForApk(salt, packageName, split.name) | ||
plugin.getInputStream(token, splitName).use { | ||
getOutputStream("apk-$packageName-${split.name}", version).use { outputStream -> | ||
it.copyTo(outputStream) | ||
} | ||
} | ||
} | ||
} | ||
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private fun getOutputStream( | ||
outputName: String, | ||
suffix: String = this.toString().split('@')[1], | ||
): OutputStream { | ||
val name = "$outputName-$suffix" | ||
val dir = File("/sdcard/.SeedVaultAndroidBackup/1/") | ||
dir.mkdirs() | ||
return File(dir, name).outputStream() | ||
} | ||
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} |