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Merge pull request #6148 from vector-im/feature/bca/fix_decrypt_redacted_event

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Fix decrypting redacted event
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Valere 2022-05-25 17:26:54 +02:00 committed by GitHub
commit 8b2d6c8dc2
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3 changed files with 92 additions and 1 deletions
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1
changelog.d/6148.bugfix Normal file
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@ -0,0 +1 @@
Fix decrypting redacted event from sending errors

79
matrix-sdk-android/src/androidTest/java/org/matrix/android/sdk/internal/crypto/DecryptRedactedEventTest.kt Normal file
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@ -0,0 +1,79 @@
/*
* Copyright 2022 The Matrix.org Foundation C.I.C.
*
* 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
import androidx.test.ext.junit.runners.AndroidJUnit4
import org.junit.Assert
import org.junit.FixMethodOrder
import org.junit.Test
import org.junit.runner.RunWith
import org.junit.runners.MethodSorters
import org.matrix.android.sdk.InstrumentedTest
import org.matrix.android.sdk.api.session.events.model.Event
import org.matrix.android.sdk.api.session.events.model.toModel
import org.matrix.android.sdk.api.session.getRoom
import org.matrix.android.sdk.api.session.room.getTimelineEvent
import org.matrix.android.sdk.common.CommonTestHelper
import org.matrix.android.sdk.common.CryptoTestHelper
@RunWith(AndroidJUnit4::class)
@FixMethodOrder(MethodSorters.JVM)
class DecryptRedactedEventTest : InstrumentedTest {
@Test
fun doNotFailToDecryptRedactedEvent() {
val testHelper = CommonTestHelper(context())
val cryptoTestHelper = CryptoTestHelper(testHelper)
val testData = cryptoTestHelper.doE2ETestWithAliceAndBobInARoom(true)
val e2eRoomID = testData.roomId
val aliceSession = testData.firstSession
val bobSession = testData.secondSession!!
val roomALicePOV = aliceSession.getRoom(e2eRoomID)!!
val timelineEvent = testHelper.sendTextMessage(roomALicePOV, "Hello", 1).first()
val redactionReason = "Wrong Room"
roomALicePOV.sendService().redactEvent(timelineEvent.root, redactionReason)
// get the event from bob
testHelper.waitWithLatch {
testHelper.retryPeriodicallyWithLatch(it) {
bobSession.getRoom(e2eRoomID)?.getTimelineEvent(timelineEvent.eventId)?.root?.isRedacted() == true
}
}
val eventBobPov = bobSession.getRoom(e2eRoomID)?.getTimelineEvent(timelineEvent.eventId)!!
testHelper.runBlockingTest {
try {
val result = bobSession.cryptoService().decryptEvent(eventBobPov.root, "")
Assert.assertEquals(
"Unexpected redacted reason",
redactionReason,
result.clearEvent.toModel<Event>()?.unsignedData?.redactedEvent?.content?.get("reason")
)
Assert.assertEquals(
"Unexpected Redacted event id",
timelineEvent.eventId,
result.clearEvent.toModel<Event>()?.unsignedData?.redactedEvent?.redacts
)
} catch (failure: Throwable) {
Assert.fail("Should not throw when decrypting a redacted event")
}
}
}
}

13
matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/EventDecryptor.kt
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@ -29,6 +29,7 @@ import org.matrix.android.sdk.api.session.crypto.model.MXUsersDevicesMap
import org.matrix.android.sdk.api.session.events.model.Event
import org.matrix.android.sdk.api.session.events.model.EventType
import org.matrix.android.sdk.api.session.events.model.content.OlmEventContent
import org.matrix.android.sdk.api.session.events.model.toContent
import org.matrix.android.sdk.api.session.events.model.toModel
import org.matrix.android.sdk.internal.crypto.actions.EnsureOlmSessionsForDevicesAction
import org.matrix.android.sdk.internal.crypto.actions.MessageEncrypter
@ -42,7 +43,7 @@ import javax.inject.Inject
private const val SEND_TO_DEVICE_RETRY_COUNT = 3
private val loggerTag = LoggerTag("CryptoSyncHandler", LoggerTag.CRYPTO)
private val loggerTag = LoggerTag("EventDecryptor", LoggerTag.CRYPTO)
@SessionScope
internal class EventDecryptor @Inject constructor(
@ -110,6 +111,16 @@ internal class EventDecryptor @Inject constructor(
if (eventContent == null) {
Timber.tag(loggerTag.value).e("decryptEvent : empty event content")
throw MXCryptoError.Base(MXCryptoError.ErrorType.BAD_ENCRYPTED_MESSAGE, MXCryptoError.BAD_ENCRYPTED_MESSAGE_REASON)
} else if (event.isRedacted()) {
// we shouldn't attempt to decrypt a redacted event because the content is cleared and decryption will fail because of null algorithm
return MXEventDecryptionResult(
clearEvent = mapOf(
"room_id" to event.roomId.orEmpty(),
"type" to EventType.MESSAGE,
"content" to emptyMap<String, Any>(),
"unsigned" to event.unsignedData.toContent()
)
)
} else {
val algorithm = eventContent["algorithm"]?.toString()
val alg = roomDecryptorProvider.getOrCreateRoomDecryptor(event.roomId, algorithm)