crypto: Remove the one-time keys uploader
This commit is contained in:
Damir Jelić
parent
555d24fea5
commit
629623f720
|
|
@ -1,168 +0,0 @@
|
|||
/*
|
||||
* Copyright 2020 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 org.matrix.android.sdk.internal.crypto.model.MXKey
|
||||
import org.matrix.android.sdk.internal.crypto.model.rest.KeysUploadResponse
|
||||
import org.matrix.android.sdk.internal.crypto.tasks.UploadKeysTask
|
||||
import org.matrix.android.sdk.internal.session.SessionScope
|
||||
import org.matrix.android.sdk.internal.util.JsonCanonicalizer
|
||||
import org.matrix.olm.OlmAccount
|
||||
import timber.log.Timber
|
||||
import javax.inject.Inject
|
||||
import kotlin.math.floor
|
||||
import kotlin.math.min
|
||||
|
||||
@SessionScope
|
||||
internal class OneTimeKeysUploader @Inject constructor(
|
||||
private val olmDevice: MXOlmDevice,
|
||||
private val objectSigner: ObjectSigner,
|
||||
private val uploadKeysTask: UploadKeysTask
|
||||
) {
|
||||
// tell if there is a OTK check in progress
|
||||
private var oneTimeKeyCheckInProgress = false
|
||||
|
||||
// last OTK check timestamp
|
||||
private var lastOneTimeKeyCheck: Long = 0
|
||||
private var oneTimeKeyCount: Int? = null
|
||||
|
||||
/**
|
||||
* Stores the current one_time_key count which will be handled later (in a call of
|
||||
* _onSyncCompleted). The count is e.g. coming from a /sync response.
|
||||
*
|
||||
* @param currentCount the new count
|
||||
*/
|
||||
fun updateOneTimeKeyCount(currentCount: Int) {
|
||||
oneTimeKeyCount = currentCount
|
||||
}
|
||||
|
||||
/**
|
||||
* Check if the OTK must be uploaded.
|
||||
*/
|
||||
suspend fun maybeUploadOneTimeKeys() {
|
||||
if (oneTimeKeyCheckInProgress) {
|
||||
Timber.v("maybeUploadOneTimeKeys: already in progress")
|
||||
return
|
||||
}
|
||||
if (System.currentTimeMillis() - lastOneTimeKeyCheck < ONE_TIME_KEY_UPLOAD_PERIOD) {
|
||||
// we've done a key upload recently.
|
||||
Timber.v("maybeUploadOneTimeKeys: executed too recently")
|
||||
return
|
||||
}
|
||||
|
||||
lastOneTimeKeyCheck = System.currentTimeMillis()
|
||||
oneTimeKeyCheckInProgress = true
|
||||
|
||||
// We then check how many keys we can store in the Account object.
|
||||
val maxOneTimeKeys = olmDevice.getMaxNumberOfOneTimeKeys()
|
||||
|
||||
// Try to keep at most half that number on the server. This leaves the
|
||||
// rest of the slots free to hold keys that have been claimed from the
|
||||
// server but we haven't received a message for.
|
||||
// If we run out of slots when generating new keys then olm will
|
||||
// discard the oldest private keys first. This will eventually clean
|
||||
// out stale private keys that won't receive a message.
|
||||
val keyLimit = floor(maxOneTimeKeys / 2.0).toInt()
|
||||
val oneTimeKeyCountFromSync = oneTimeKeyCount
|
||||
if (oneTimeKeyCountFromSync != null) {
|
||||
// We need to keep a pool of one time public keys on the server so that
|
||||
// other devices can start conversations with us. But we can only store
|
||||
// a finite number of private keys in the olm Account object.
|
||||
// To complicate things further then can be a delay between a device
|
||||
// claiming a public one time key from the server and it sending us a
|
||||
// message. We need to keep the corresponding private key locally until
|
||||
// we receive the message.
|
||||
// But that message might never arrive leaving us stuck with duff
|
||||
// private keys clogging up our local storage.
|
||||
// So we need some kind of engineering compromise to balance all of
|
||||
// these factors.
|
||||
try {
|
||||
val uploadedKeys = uploadOTK(oneTimeKeyCountFromSync, keyLimit)
|
||||
Timber.v("## uploadKeys() : success, $uploadedKeys key(s) sent")
|
||||
} finally {
|
||||
oneTimeKeyCheckInProgress = false
|
||||
}
|
||||
} else {
|
||||
Timber.w("maybeUploadOneTimeKeys: waiting to know the number of OTK from the sync")
|
||||
oneTimeKeyCheckInProgress = false
|
||||
lastOneTimeKeyCheck = 0
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Upload some the OTKs.
|
||||
*
|
||||
* @param keyCount the key count
|
||||
* @param keyLimit the limit
|
||||
* @return the number of uploaded keys
|
||||
*/
|
||||
private suspend fun uploadOTK(keyCount: Int, keyLimit: Int): Int {
|
||||
if (keyLimit <= keyCount) {
|
||||
// If we don't need to generate any more keys then we are done.
|
||||
return 0
|
||||
}
|
||||
val keysThisLoop = min(keyLimit - keyCount, ONE_TIME_KEY_GENERATION_MAX_NUMBER)
|
||||
olmDevice.generateOneTimeKeys(keysThisLoop)
|
||||
val response = uploadOneTimeKeys(olmDevice.getOneTimeKeys())
|
||||
olmDevice.markKeysAsPublished()
|
||||
|
||||
if (response.hasOneTimeKeyCountsForAlgorithm(MXKey.KEY_SIGNED_CURVE_25519_TYPE)) {
|
||||
// Maybe upload other keys
|
||||
return keysThisLoop + uploadOTK(response.oneTimeKeyCountsForAlgorithm(MXKey.KEY_SIGNED_CURVE_25519_TYPE), keyLimit)
|
||||
} else {
|
||||
Timber.e("## uploadOTK() : response for uploading keys does not contain one_time_key_counts.signed_curve25519")
|
||||
throw Exception("response for uploading keys does not contain one_time_key_counts.signed_curve25519")
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Upload curve25519 one time keys.
|
||||
*/
|
||||
private suspend fun uploadOneTimeKeys(oneTimeKeys: Map<String, Map<String, String>>?): KeysUploadResponse {
|
||||
val oneTimeJson = mutableMapOf<String, Any>()
|
||||
|
||||
val curve25519Map = oneTimeKeys?.get(OlmAccount.JSON_KEY_ONE_TIME_KEY).orEmpty()
|
||||
|
||||
curve25519Map.forEach { (key_id, value) ->
|
||||
val k = mutableMapOf<String, Any>()
|
||||
k["key"] = value
|
||||
|
||||
// the key is also signed
|
||||
val canonicalJson = JsonCanonicalizer.getCanonicalJson(Map::class.java, k)
|
||||
|
||||
k["signatures"] = objectSigner.signObject(canonicalJson)
|
||||
|
||||
oneTimeJson["signed_curve25519:$key_id"] = k
|
||||
}
|
||||
|
||||
// For now, we set the device id explicitly, as we may not be using the
|
||||
// same one as used in login.
|
||||
val uploadParams = UploadKeysTask.Params(null, oneTimeJson)
|
||||
return uploadKeysTask.execute(uploadParams)
|
||||
}
|
||||
|
||||
companion object {
|
||||
// max number of keys to upload at once
|
||||
// Creating keys can be an expensive operation so we limit the
|
||||
// number we generate in one go to avoid blocking the application
|
||||
// for too long.
|
||||
private const val ONE_TIME_KEY_GENERATION_MAX_NUMBER = 5
|
||||
|
||||
// frequency with which to check & upload one-time keys
|
||||
private const val ONE_TIME_KEY_UPLOAD_PERIOD = (60 * 1000).toLong() // one minute
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue