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QRCode: add other_device_key field and make it optional, along with other_user_key

This commit is contained in:
Benoit Marty 2020-01-30 16:24:24 +01:00
parent 6282f81bc4
commit fb98d6ef42
5 changed files with 230 additions and 31 deletions
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125
matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/verification/DefaultVerificationService.kt
View File

@ -733,7 +733,7 @@ internal class DefaultVerificationService @Inject constructor(
// Check if other user is able to scan QR code
?.takeIf { it.contains(VERIFICATION_METHOD_QR_CODE_SCAN) }
?.let {
createQrCodeData(existingRequest.transactionId, existingRequest.otherUserId)
createQrCodeData(existingRequest.transactionId, existingRequest.otherUserId, readyReq.fromDevice)
}
if (readyReq.methods.orEmpty().contains(VERIFICATION_METHOD_RECIPROCATE)) {
@ -760,13 +760,25 @@ internal class DefaultVerificationService @Inject constructor(
))
}
private fun createQrCodeData(transactionId: String?, otherUserId: String): QrCodeData? {
// Build the QR code URL
val requestEventId = transactionId ?: run {
private fun createQrCodeData(requestEventId: String?, otherUserId: String, otherDeviceId: String?): QrCodeData? {
requestEventId ?: run {
Timber.w("## Unknown requestEventId")
return null
}
return when {
userId != otherUserId ->
createQrCodeDataForDistinctUser(requestEventId, otherUserId, otherDeviceId)
crossSigningService.isCrossSigningVerified() ->
// This is a self verification and I am the old device (Osborne2)
createQrCodeDataForVerifiedDevice(requestEventId, otherDeviceId)
else ->
// This is a self verification and I am the new device (Dynabook)
createQrCodeDataForUnVerifiedDevice(requestEventId, otherDeviceId)
}
}
private fun createQrCodeDataForDistinctUser(requestEventId: String, otherUserId: String, otherDeviceId: String?): QrCodeData? {
val myMasterKey = crossSigningService.getMyCrossSigningKeys()
?.masterKey()
?.unpaddedBase64PublicKey
@ -789,9 +801,17 @@ internal class DefaultVerificationService @Inject constructor(
return null
}
val myDeviceKey = myDeviceInfoHolder.get().myDevice.fingerprint()!!
val myDeviceKey = myDeviceInfoHolder.get().myDevice.fingerprint()
?: run {
Timber.w("## Unable to get my fingerprint")
return null
}
val otherDeviceKey = otherDeviceId
?.let {
cryptoStore.getUserDevice(userId, otherDeviceId)?.fingerprint()
}
val generatedSharedSecret = generateSharedSecret()
return QrCodeData(
userId = userId,
requestEventId = requestEventId,
@ -800,8 +820,95 @@ internal class DefaultVerificationService @Inject constructor(
myMasterKey to myMasterKey,
myDeviceId to myDeviceKey
),
sharedSecret = generatedSharedSecret,
otherUserKey = otherUserMasterKey
sharedSecret = generateSharedSecret(),
otherUserKey = otherUserMasterKey,
otherDeviceKey = otherDeviceKey
)
}
// Create a QR code to display on the old device (Osborne2)
private fun createQrCodeDataForVerifiedDevice(requestEventId: String, otherDeviceId: String?): QrCodeData? {
val myMasterKey = crossSigningService.getMyCrossSigningKeys()
?.masterKey()
?.unpaddedBase64PublicKey
?: run {
Timber.w("## Unable to get my master key")
return null
}
val otherDeviceKey = otherDeviceId
?.let {
cryptoStore.getUserDevice(userId, otherDeviceId)?.fingerprint()
}
?: run {
Timber.w("## Unable to get other device data")
return null
}
val myDeviceId = deviceId
?: run {
Timber.w("## Unable to get my deviceId")
return null
}
val myDeviceKey = myDeviceInfoHolder.get().myDevice.fingerprint()
?: run {
Timber.w("## Unable to get my fingerprint")
return null
}
return QrCodeData(
userId = userId,
requestEventId = requestEventId,
action = QrCodeData.ACTION_VERIFY,
keys = hashMapOf(
myMasterKey to myMasterKey,
myDeviceId to myDeviceKey
),
sharedSecret = generateSharedSecret(),
otherUserKey = null,
otherDeviceKey = otherDeviceKey
)
}
// Create a QR code to display on the new device (Dynabook)
private fun createQrCodeDataForUnVerifiedDevice(requestEventId: String, otherDeviceId: String?): QrCodeData? {
val myMasterKey = crossSigningService.getMyCrossSigningKeys()
?.masterKey()
?.unpaddedBase64PublicKey
?: run {
Timber.w("## Unable to get my master key")
return null
}
val myDeviceId = deviceId
?: run {
Timber.w("## Unable to get my deviceId")
return null
}
val myDeviceKey = myDeviceInfoHolder.get().myDevice.fingerprint()
?: run {
Timber.w("## Unable to get my fingerprint")
return null
}
val otherDeviceKey = otherDeviceId
?.let {
cryptoStore.getUserDevice(userId, otherDeviceId)?.fingerprint()
}
return QrCodeData(
userId = userId,
requestEventId = requestEventId,
action = QrCodeData.ACTION_VERIFY,
keys = hashMapOf(
// Note: no master key here
myDeviceId to myDeviceKey
),
sharedSecret = generateSharedSecret(),
otherUserKey = myMasterKey,
otherDeviceKey = otherDeviceKey
)
}
@ -1128,7 +1235,7 @@ internal class DefaultVerificationService @Inject constructor(
if (VERIFICATION_METHOD_QR_CODE_SCAN in otherUserMethods || VERIFICATION_METHOD_QR_CODE_SHOW in otherUserMethods) {
// Other user wants to verify using QR code. Cross-signing has to be setup
val qrCodeData = createQrCodeData(transactionId, otherUserId)
val qrCodeData = createQrCodeData(transactionId, otherUserId, otherDeviceId)
if (qrCodeData != null) {
if (VERIFICATION_METHOD_QR_CODE_SCAN in otherUserMethods && VerificationMethod.QR_CODE_SHOW in methods) {

32
matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/verification/qrcode/DefaultQrCodeVerificationTransaction.kt
View File

@ -88,12 +88,29 @@ internal class DefaultQrCodeVerificationTransaction(
}
// check master key
if (otherQrCodeData.otherUserKey != crossSigningService.getUserCrossSigningKeys(userId)?.masterKey()?.unpaddedBase64PublicKey) {
if (otherQrCodeData.userId != userId
&& otherQrCodeData.otherUserKey == null) {
// Verification with other user, other_user_key is mandatory in this case
Timber.d("## Verification QR: Invalid, missing other_user_key")
cancel(CancelCode.QrCodeInvalid)
return
}
if (otherQrCodeData.otherUserKey != null
&& otherQrCodeData.otherUserKey != crossSigningService.getUserCrossSigningKeys(userId)?.masterKey()?.unpaddedBase64PublicKey) {
Timber.d("## Verification QR: Invalid other master key ${otherQrCodeData.otherUserKey}")
cancel(CancelCode.MismatchedKeys)
return
}
// Check device key if available
if (otherQrCodeData.otherDeviceKey != null
&& otherQrCodeData.otherDeviceKey != cryptoStore.getUserDevice(otherQrCodeData.userId, otherDeviceId ?: "")?.fingerprint()) {
Timber.d("## Verification QR: Invalid other device key")
cancel(CancelCode.MismatchedKeys)
return
}
val toVerifyDeviceIds = mutableListOf<String>()
var canTrustOtherUserMasterKey = false
@ -147,8 +164,15 @@ internal class DefaultQrCodeVerificationTransaction(
// qrCodeData.sharedSecret will be used to send the start request
start(otherQrCodeData.sharedSecret)
val safeOtherDeviceId = otherDeviceId
if (!otherQrCodeData.otherDeviceKey.isNullOrBlank()
&& safeOtherDeviceId != null) {
// Locally verify the device
toVerifyDeviceIds.add(safeOtherDeviceId)
}
// Trust the other user
trust(canTrustOtherUserMasterKey, toVerifyDeviceIds)
trust(canTrustOtherUserMasterKey, toVerifyDeviceIds.distinct())
}
fun start(remoteSecret: String) {
@ -240,8 +264,8 @@ internal class DefaultQrCodeVerificationTransaction(
// TODO what if the otherDevice is not in this list? and should we
toVerifyDeviceIds.forEach {
setDeviceVerified(otherUserId, it)
}
setDeviceVerified(otherUserId, it)
}
transport.done(transactionId)
state = VerificationTxState.Verified
}

21
matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/verification/qrcode/Extensions.kt
View File

@ -32,6 +32,7 @@ private const val ENCODING = "utf-8"
* &key_<keyid>=<key-in-base64>...
* &secret=<shared_secret>
* &other_user_key=<master-key-in-base64>
* &other_device_key=<device-key-in-base64>
*
* Example:
* https://matrix.to/#/@user:matrix.org?
@ -40,7 +41,8 @@ private const val ENCODING = "utf-8"
* &key_VJEDVKUYTQ=DL7LWIw7Qp%2B4AREDACTEDOwy2BjygumSWAGfzaWY
* &key_fsh%2FfQ08N3xvh4ySXsINB%2BJ2hREDACTEDVcVOG4qqo=fsh%2FfQ08N3xvh4ySXsINB%2BJ2hREDACTEDVcVOG4qqo
* &secret=AjQqw51Fp6UBuPolZ2FAD5WnXc22ZhJG6iGslrVvIdw%3D
* &other_user_key=WqSVLkBCS%2Fi5NqR%2F%2FymC8T7K9RPxBIuqK8Usl6Y3big
* &other_user_key=WqSVLkBCS%2Fi5NqRREDACTEDRPxBIuqK8Usl6Y3big
* &other_device_key=WqSVLkBREDACTEDBsfszdvsdBEvefqsdcsfBvsfcsFb
* </pre>
*/
fun QrCodeData.toUrl(): String {
@ -58,8 +60,15 @@ fun QrCodeData.toUrl(): String {
append("&secret=")
append(URLEncoder.encode(sharedSecret, ENCODING))
append("&other_user_key=")
append(URLEncoder.encode(otherUserKey, ENCODING))
if (!otherUserKey.isNullOrBlank()) {
append("&other_user_key=")
append(URLEncoder.encode(otherUserKey, ENCODING))
}
if (!otherDeviceKey.isNullOrBlank()) {
append("&other_device_key=")
append(URLEncoder.encode(otherDeviceKey, ENCODING))
}
}
}
@ -100,7 +109,8 @@ fun String.toQrCodeData(): QrCodeData? {
val requestEventId = keyValues["request"]?.takeIf { MatrixPatterns.isEventId(it) } ?: return null
val sharedSecret = keyValues["secret"] ?: return null
val otherUserKey = keyValues["other_user_key"] ?: return null
val otherUserKey = keyValues["other_user_key"]
val otherDeviceKey = keyValues["other_device_key"]
val keys = keyValues.keys
.filter { it.startsWith("key_") }
@ -115,6 +125,7 @@ fun String.toQrCodeData(): QrCodeData? {
action,
keys,
sharedSecret,
otherUserKey
otherUserKey,
otherDeviceKey
)
}

9
matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/verification/qrcode/QrCodeData.kt
View File

@ -26,13 +26,18 @@ data class QrCodeData(
// The action
val action: String,
// key_<key_id>: each key that the user wants verified will have an entry of this form, where the value is the key in unpadded base64.
// The QR code should contain at least the user's master cross-signing key.
// The QR code should contain at least the user's master cross-signing key. In the case where a device does not have a cross-signing key
// (as in the case where a user logs in to a new device, and is verifying against another device), thin the QR code should contain at
// least the device's key.
val keys: Map<String, String>,
// random single-use shared secret in unpadded base64. It must be at least 256-bits long (43 characters when base64-encoded).
val sharedSecret: String,
// the other user's master cross-signing key, in unpadded base64. In other words, if Alice is displaying the QR code,
// this would be the copy of Bob's master cross-signing key that Alice has.
val otherUserKey: String
val otherUserKey: String?,
// The other device's key, in unpadded base64
// This is only needed when a user is verifying their own devices, where the other device has not yet been signed with the cross-signing key.
val otherDeviceKey: String?
) {
companion object {
const val ACTION_VERIFY = "verify"

74
matrix-sdk-android/src/test/java/im/vector/matrix/android/internal/crypto/verification/qrcode/QrCodeTest.kt
View File

@ -16,6 +16,7 @@
package im.vector.matrix.android.internal.crypto.verification.qrcode
import org.amshove.kluent.shouldBe
import org.amshove.kluent.shouldBeEqualTo
import org.amshove.kluent.shouldBeNull
import org.amshove.kluent.shouldNotBeNull
@ -36,10 +37,18 @@ class QrCodeTest {
"2" to "ghijql"
),
sharedSecret = "sharedSecret",
otherUserKey = "otherUserKey"
otherUserKey = "otherUserKey",
otherDeviceKey = "otherDeviceKey"
)
private val basicUrl = "https://matrix.to/#/@benoit:matrix.org?request=%24azertyazerty&action=verify&key_1=abcdef&key_2=ghijql&secret=sharedSecret&other_user_key=otherUserKey"
private val basicUrl = "https://matrix.to/#/@benoit:matrix.org" +
"?request=%24azertyazerty" +
"&action=verify" +
"&key_1=abcdef" +
"&key_2=ghijql" +
"&secret=sharedSecret" +
"&other_user_key=otherUserKey" +
"&other_device_key=otherDeviceKey"
@Test
fun testNominalCase() {
@ -56,7 +65,8 @@ class QrCodeTest {
decodedData.keys["1"]?.shouldBeEqualTo("abcdef")
decodedData.keys["2"]?.shouldBeEqualTo("ghijql")
decodedData.sharedSecret shouldBeEqualTo "sharedSecret"
decodedData.otherUserKey shouldBeEqualTo "otherUserKey"
decodedData.otherUserKey?.shouldBeEqualTo("otherUserKey")
decodedData.otherDeviceKey?.shouldBeEqualTo("otherDeviceKey")
}
@Test
@ -81,7 +91,56 @@ class QrCodeTest {
decodedData.keys["1"]?.shouldBeEqualTo("abcdef")
decodedData.keys["2"]?.shouldBeEqualTo("ghijql")
decodedData.sharedSecret shouldBeEqualTo "sharedSecret"
decodedData.otherUserKey shouldBeEqualTo "otherUserKey"
decodedData.otherUserKey!! shouldBeEqualTo "otherUserKey"
decodedData.otherDeviceKey!! shouldBeEqualTo "otherDeviceKey"
}
@Test
fun testNoOtherUserKey() {
val url = basicQrCodeData
.copy(
otherUserKey = null
)
.toUrl()
url shouldBeEqualTo basicUrl
.replace("&other_user_key=otherUserKey", "")
val decodedData = url.toQrCodeData()
decodedData.shouldNotBeNull()
decodedData.userId shouldBeEqualTo "@benoit:matrix.org"
decodedData.requestEventId shouldBeEqualTo "\$azertyazerty"
decodedData.keys["1"]?.shouldBeEqualTo("abcdef")
decodedData.keys["2"]?.shouldBeEqualTo("ghijql")
decodedData.sharedSecret shouldBeEqualTo "sharedSecret"
decodedData.otherUserKey shouldBe null
decodedData.otherDeviceKey?.shouldBeEqualTo("otherDeviceKey")
}
@Test
fun testNoOtherDeviceKey() {
val url = basicQrCodeData
.copy(
otherDeviceKey = null
)
.toUrl()
url shouldBeEqualTo basicUrl
.replace("&other_device_key=otherDeviceKey", "")
val decodedData = url.toQrCodeData()
decodedData.shouldNotBeNull()
decodedData.userId shouldBeEqualTo "@benoit:matrix.org"
decodedData.requestEventId shouldBeEqualTo "\$azertyazerty"
decodedData.keys["1"]?.shouldBeEqualTo("abcdef")
decodedData.keys["2"]?.shouldBeEqualTo("ghijql")
decodedData.sharedSecret shouldBeEqualTo "sharedSecret"
decodedData.otherUserKey?.shouldBeEqualTo("otherUserKey")
decodedData.otherDeviceKey shouldBe null
}
@Test
@ -149,11 +208,4 @@ class QrCodeTest {
.toQrCodeData()
.shouldBeNull()
}
@Test
fun testMissingOtherUserKey() {
basicUrl.replace("&other_user_key=otherUserKey", "")
.toQrCodeData()
.shouldBeNull()
}
}