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Fix backup authdata serialization

This commit is contained in:
valere 2022-12-05 13:45:58 +01:00
parent c0614a9fb6
commit adacd55a05
3 changed files with 59 additions and 12 deletions
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37
matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/keysbackup/model/rest/DefaultKeysAlgorithmAndData.kt Normal file
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@ -0,0 +1,37 @@
/*
* Copyright (c) 2022 New Vector Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.matrix.android.sdk.internal.crypto.keysbackup.model.rest
import com.squareup.moshi.Json
import com.squareup.moshi.JsonClass
import org.matrix.android.sdk.api.util.JsonDict
@JsonClass(generateAdapter = true)
internal data class DefaultKeysAlgorithmAndData(
/**
* The algorithm used for storing backups. Currently, only "m.megolm_backup.v1.curve25519-aes-sha2" is defined.
*/
@Json(name = "algorithm")
override val algorithm: String,
/**
* algorithm-dependent data, for "m.megolm_backup.v1.curve25519-aes-sha2".
* see [org.matrix.android.sdk.internal.crypto.keysbackup.MegolmBackupAuthData]
*/
@Json(name = "auth_data")
override val authData: JsonDict
) : KeysAlgorithmAndData

16
matrix-sdk-android/src/rustCrypto/java/org/matrix/android/sdk/internal/crypto/OlmMachine.kt
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@ -52,6 +52,9 @@ import org.matrix.android.sdk.api.util.JsonDict
import org.matrix.android.sdk.api.util.Optional
import org.matrix.android.sdk.api.util.toOptional
import org.matrix.android.sdk.internal.coroutines.builder.safeInvokeOnClose
import org.matrix.android.sdk.internal.crypto.keysbackup.model.rest.CreateKeysBackupVersionBody
import org.matrix.android.sdk.internal.crypto.keysbackup.model.rest.DefaultKeysAlgorithmAndData
import org.matrix.android.sdk.internal.crypto.keysbackup.model.rest.KeysAlgorithmAndData
import org.matrix.android.sdk.internal.crypto.network.RequestSender
import org.matrix.android.sdk.internal.crypto.verification.SasVerification
import org.matrix.android.sdk.internal.crypto.verification.VerificationRequest
@ -860,14 +863,19 @@ internal class OlmMachine @Inject constructor(
}
@Throws(CryptoStoreException::class)
suspend fun checkAuthDataSignature(authData: MegolmBackupAuthData): Boolean {
suspend fun checkAuthDataSignature(authData: KeysAlgorithmAndData): Boolean {
return withContext(coroutineDispatchers.computation) {
val adapter = moshi
.newBuilder()
.add(CheckNumberType.JSON_ADAPTER_FACTORY)
.build()
.adapter(MegolmBackupAuthData::class.java)
val serializedAuthData = adapter.toJson(authData)
.adapter(DefaultKeysAlgorithmAndData::class.java)
val serializedAuthData = adapter.toJson(
DefaultKeysAlgorithmAndData(
algorithm = authData.algorithm,
authData = authData.authData
)
)
inner.verifyBackup(serializedAuthData).trusted
}
}

18
matrix-sdk-android/src/rustCrypto/java/org/matrix/android/sdk/internal/crypto/keysbackup/RustKeyBackupService.kt
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@ -54,6 +54,7 @@ import org.matrix.android.sdk.internal.crypto.OlmMachine
import org.matrix.android.sdk.internal.crypto.keysbackup.model.SignalableMegolmBackupAuthData
import org.matrix.android.sdk.internal.crypto.keysbackup.model.rest.CreateKeysBackupVersionBody
import org.matrix.android.sdk.internal.crypto.keysbackup.model.rest.KeyBackupData
import org.matrix.android.sdk.internal.crypto.keysbackup.model.rest.KeysAlgorithmAndData
import org.matrix.android.sdk.internal.crypto.keysbackup.model.rest.KeysBackupData
import org.matrix.android.sdk.internal.crypto.keysbackup.model.rest.UpdateKeysBackupVersionBody
import org.matrix.android.sdk.internal.crypto.network.RequestSender
@ -259,19 +260,20 @@ internal class RustKeyBackupService @Inject constructor(
// TODO()
// }
private suspend fun checkBackupTrust(authData: MegolmBackupAuthData?): KeysBackupVersionTrust {
return if (authData == null || authData.publicKey.isEmpty() || authData.signatures.isNullOrEmpty()) {
Timber.v("getKeysBackupTrust: Key backup is absent or missing required data")
KeysBackupVersionTrust(usable = false)
} else {
KeysBackupVersionTrust(olmMachine.checkAuthDataSignature(authData))
private suspend fun checkBackupTrust(algAndData: KeysAlgorithmAndData?): KeysBackupVersionTrust {
if (algAndData == null) return KeysBackupVersionTrust(usable = false)
try {
val isTrusted = olmMachine.checkAuthDataSignature(algAndData)
return KeysBackupVersionTrust(isTrusted)
} catch (failure: Throwable) {
Timber.w(failure, "Failed to trust backup")
return KeysBackupVersionTrust(usable = false)
}
}
override suspend fun getKeysBackupTrust(keysBackupVersion: KeysVersionResult): KeysBackupVersionTrust {
val authData = keysBackupVersion.getAuthDataAsMegolmBackupAuthData()
return withContext(coroutineDispatchers.crypto) {
checkBackupTrust(authData)
checkBackupTrust(keysBackupVersion)
}
}