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Merged
tladesignz merged 1 commit into from
Jan 7, 2026
Merged

LocalContainer not adhering to specifications #48

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189 changes: 115 additions & 74 deletions wrapper/src/main/java/io/yubicolabs/wwwwallet/credentials/LocalContainer.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -70,45 +70,38 @@ class LocalContainer(
options: JSONObject,
successCallback: (JSONObject) -> Unit,
failureCallback: (Throwable) -> Unit,
) = create(options, null, successCallback, failureCallback)

fun create(
options: JSONObject,
clientDataJsonHash: ByteArray?,
successCallback: (JSONObject) -> Unit,
failureCallback: (Throwable) -> Unit,
) = try {
val credential = createCredential(options)
val credential = createCredential(options, clientDataJsonHash)
successCallback(credential)
} catch (th: Throwable) {
YOLOLogger.e(tagForLog, "Cannot create credential.", th)
failureCallback(th)
}

private fun createCredential(options: JSONObject): JSONObject {
private fun createCredential(
options: JSONObject,
clientDataHash: ByteArray?,
): JSONObject {
val selectedAlgorithm = selectAlgorithm(options)
val (algorithmSpec, keyAlgorithm) = getAlgorithmParams(selectedAlgorithm)

val credentialId = ByteArray(32)
SecureRandom().nextBytes(credentialId)

val challenge =
(options.getNested("publicKey.challenge") as? String)?.decodeBase64()?.toByteArray()
?: byteArrayOf()

val spec = buildKeyGenParameterSpec(credentialId, challenge, algorithmSpec)
val spec = buildKeyGenParameterSpec(credentialId, algorithmSpec)
val keyPair = generateKeyPair(keyAlgorithm, spec)

val rpId =
options.getNested("publicKey.rp.id") as? String
?: throw IllegalStateException("'publicKey.rp.id' on credential create options not set.")

val clientDataJson =
getClientOptions(
type = "webauthn.create",
challenge = challenge,
origin = rpId,
)

val clientDataJsonB64 =
encodeToString(
clientDataJson,
NO_PADDING or NO_WRAP or URL_SAFE,
)

val (attestationObject, authenticatorData) =
createAttestationObject(
rpId = rpId,
Expand All @@ -120,10 +113,14 @@ class LocalContainer(
signatureCount = 0,
)

val challenge =
(options.getNested("publicKey.challenge") as? String)?.decodeBase64()?.toByteArray()
?: throw (IllegalStateException("Challenge not present."))

val credential =
createPublicKeyCredential(
credentialId,
clientDataJsonB64,
clientDataHash ?: getClientOptions(type = "webauthn.create", challenge = challenge, origin = rpId),
attestationObject,
authenticatorData,
selectedAlgorithm,
Expand All @@ -137,6 +134,35 @@ class LocalContainer(
return credential
}

fun delete(
credentialId: String,
successCallback: () -> Unit,
failureCallback: (Throwable) -> Unit,
) = try {
val byteId = credentialId.decodeBase64()?.toByteArray() ?: byteArrayOf()
val alias = "$origin+${byteId.toHexString()}"
val filename = byteId.credIdToFilename()

if (secureStore.containsAlias(alias)) {
secureStore.deleteEntry(alias)
} else {
failureCallback(IllegalStateException("Credential alias nor found."))
}

if (filename !in context.fileList()) {
// no delete necessary
failureCallback(IllegalStateException("File $filename not found."))
} else {
if (context.deleteFile(filename)) {
successCallback()
} else {
failureCallback(RuntimeException("Failed to delete $filename file."))
}
}
} catch (th: Throwable) {
failureCallback(th)
}

private fun selectAlgorithm(options: JSONObject): Int {
val pubKeyCredParams: List<*> =
options.getNested("publicKey.pubKeyCredParams") as? List<*> ?: listOf<Any>()
Expand All @@ -157,23 +183,19 @@ class LocalContainer(

private fun buildKeyGenParameterSpec(
credentialId: ByteArray,
challenge: ByteArray,
algorithmSpec: AlgorithmParameterSpec,
): KeyGenParameterSpec =
KeyGenParameterSpec
.Builder(
"$origin+${credentialId.toHexString()}",
PURPOSE_SIGN or PURPOSE_VERIFY,
)
.setAlgorithmParameterSpec(algorithmSpec)
).setAlgorithmParameterSpec(algorithmSpec)
.setIsStrongBoxBacked(
isStrongBoxed,
).setDigests(
DIGEST_SHA256,
DIGEST_SHA384,
DIGEST_SHA512,
).setAttestationChallenge(
challenge,
).build()

private fun generateKeyPair(
Expand All @@ -191,7 +213,7 @@ class LocalContainer(

private fun createPublicKeyCredential(
credentialId: ByteArray,
clientDataJsonB64: String,
clientDataHash: ByteArray,
attestationObject: String,
authenticatorData: ByteArray,
publicKeyAlgorithm: Int,
Expand All @@ -200,7 +222,11 @@ class LocalContainer(
val response =
JSONObject(
mapOf(
"clientDataJSON" to clientDataJsonB64,
"clientDataJSON" to
encodeToString(
clientDataHash,
NO_PADDING or NO_WRAP or URL_SAFE,
),
"attestationObject" to attestationObject,
"authenticatorData" to
encodeToString(
Expand Down Expand Up @@ -241,9 +267,13 @@ class LocalContainer(
type: String,
challenge: ByteArray,
origin: String,
): ByteArray {
return """{"type":"$type","challenge":"${encodeToString(challenge, NO_PADDING or NO_WRAP or URL_SAFE)}","origin":"${origin.fullyQualified()}","crossOrigin":false}""".toByteArray()
}
): ByteArray =
"""{"type":"$type","challenge":"${
encodeToString(
challenge,
NO_PADDING or NO_WRAP or URL_SAFE,
)
}","origin":"${origin.fullyQualified()}","crossOrigin":false}""".toByteArray()

private fun createAttestationObject(
rpId: String,
Expand All @@ -266,7 +296,8 @@ class LocalContainer(

val attestationObject =
encodeToString(
CBORObject.NewMap()
CBORObject
.NewMap()
.Add("fmt", "none")
.Add("attStmt", CBORObject.NewMap())
.Add("authData", authenticatorData)
Expand All @@ -281,7 +312,8 @@ class LocalContainer(
cosePublicKey: ByteArray,
): ByteArray {
val attestedCredentialDataLength = 16 + 2 + credentialId.size + cosePublicKey.size
return ByteBuffer.allocate(attestedCredentialDataLength)
return ByteBuffer
.allocate(attestedCredentialDataLength)
.order(ByteOrder.BIG_ENDIAN)
.put(aaguid.toByteArray(), 0, 16)
.putShort(credentialId.size.toShort())
Expand Down Expand Up @@ -309,7 +341,8 @@ class LocalContainer(
?: 0
) + (extensions?.size ?: 0)
val authenticatorData =
ByteBuffer.allocate(authenticatorDataLength)
ByteBuffer
.allocate(authenticatorDataLength)
.order(ByteOrder.BIG_ENDIAN)
.put(rpIdHash, 0, 32)
.put(flags)
Expand Down Expand Up @@ -345,53 +378,57 @@ class LocalContainer(
return flags.toByte()
}

private fun isAlgorithmSupported(alg: Int): Boolean {
return alg in listOf(-7, -257, -35, -36)
}
private fun isAlgorithmSupported(alg: Int): Boolean = alg in listOf(-7, -257, -35, -36)

private fun getAlgorithmParams(alg: Int): Pair<AlgorithmParameterSpec, String> {
return when (alg) {
private fun getAlgorithmParams(alg: Int): Pair<AlgorithmParameterSpec, String> =
when (alg) {
-7 -> ECGenParameterSpec("secp256r1") to KEY_ALGORITHM_EC
-35 -> ECGenParameterSpec("secp384r1") to KEY_ALGORITHM_EC
-36 -> ECGenParameterSpec("secp521r1") to KEY_ALGORITHM_EC
else -> throw IllegalArgumentException("Unsupported algorithm: $alg")
}
}

fun getAll(
options: JSONObject,
maybeClientDataJsonHash: ByteArray? = null,
successCallback: (JSONArray) -> Unit,
failureCallback: (Throwable) -> Unit,
) = try {
YOLOLogger.i("found credentials", "get options: ${options.toString(2)}")

val allowedCredentials: List<Map<*, *>> =
(options.getNested("publicKey.allowCredentials") as? List<Map<*, *>>) ?: listOf<Map<*, *>>()

val rpId = options.getNested("publicKey.rpId") as? String ?: ""

val challenge =
(options.getNested("publicKey.challenge") as? String)?.decodeBase64()?.toByteArray()
?: byteArrayOf()

val rpId = options.getNested("publicKey.rpId") as? String ?: ""
val clientDataJsonHash =
maybeClientDataJsonHash ?: getClientOptions(type = "webauthn.get", challenge = challenge, origin = rpId)

// retrieve allowed or all credentials
val selectedCredentials =
if (allowedCredentials.isNotEmpty()) {
allowedCredentials.mapNotNull { allowed ->
val type = allowed.getOrDefault("type", null) as? String ?: ""
if (type != "public-key") {
YOLOLogger.e(tagForLog, "Found non 'public-key' credential id in allow list.")
}

val allowedIdB64 = allowed.getOrDefault("id", null) as? String ?: ""
val allowedIdRaw = allowedIdB64.decodeBase64()
val allowedId = allowedIdRaw?.hex() ?: ""
val alias = "$origin+$allowedId"

if (secureStore.containsAlias(alias)) {
alias to secureStore.getEntry(alias, null)
} else {
null
}
}.associate { it }
allowedCredentials
.mapNotNull { allowed ->
val type = allowed.getOrDefault("type", null) as? String ?: ""
if (type != "public-key") {
YOLOLogger.e(tagForLog, "Found non 'public-key' credential id in allow list.")
}

val allowedIdB64 = allowed.getOrDefault("id", null) as? String ?: ""
val allowedIdRaw = allowedIdB64.decodeBase64()
val allowedId = allowedIdRaw?.hex() ?: ""
val alias = "$origin+$allowedId"

if (secureStore.containsAlias(alias)) {
alias to secureStore.getEntry(alias, null)
} else {
null
}
}.associate { it }
} else {
secureStore.aliases().toList().associate { key ->
key to secureStore.getEntry(key, null)
Expand All @@ -408,11 +445,18 @@ class LocalContainer(
finalSelection.mapNotNull { selectionEntry ->
val (key, keyEntry) = selectionEntry
(keyEntry as? KeyStore.PrivateKeyEntry)
?.toResponse(key, challenge, rpId)
?.toResponse(
id = key,
clientDataJson = clientDataJsonHash,
rpId = rpId,
)
}

val credentialsJson = JSONArray(credentials)
val msg = credentialsJson.toString(2)
YOLOLogger.i("Found credentials", "get response: $msg")
successCallback(
JSONArray(credentials),
credentialsJson,
)
} catch (th: Throwable) {
YOLOLogger.e(tagForLog, "Couldn't return all credentials.", th)
Expand All @@ -423,9 +467,17 @@ class LocalContainer(
options: JSONObject,
successCallback: (JSONObject) -> Unit,
failureCallback: (Throwable) -> Unit,
) = get(options, null, successCallback, failureCallback)

fun get(
options: JSONObject,
clientDataJsonHash: ByteArray?,
successCallback: (JSONObject) -> Unit,
failureCallback: (Throwable) -> Unit,
) = try {
getAll(
options = options,
maybeClientDataJsonHash = clientDataJsonHash,
successCallback = { jsonArray ->
if (jsonArray.length() > 0) {
successCallback(jsonArray.getJSONObject(0))
Expand All @@ -442,18 +494,12 @@ class LocalContainer(

private fun KeyStore.PrivateKeyEntry.toResponse(
id: String,
challenge: ByteArray,
clientDataJson: ByteArray,
rpId: String,
): JSONObject {
val credentialId =
id.replace("$origin+", "").hexToByteArray()

val clientDataJson =
getClientOptions(
type = "webauthn.get",
challenge = challenge,
origin = rpId,
)
val clientDataJsonB64 =
encodeToString(
clientDataJson,
Expand Down Expand Up @@ -500,11 +546,7 @@ class LocalContainer(
signature,
NO_PADDING or NO_WRAP or URL_SAFE,
),
"userHandle" to
encodeToString(
userId.toByteArray(),
NO_PADDING or NO_WRAP or URL_SAFE,
),
"userHandle" to userId,
"userName" to userName,
"userDisplayName" to userDisplayName,
),
Expand Down Expand Up @@ -589,8 +631,7 @@ class LocalContainer(
.digest(
"AES+${toHexString()}"
.toByteArray(),
)
.toHexString()
).toHexString()
}

private fun PrivateKey.deriveKeyFromKeyPair(): SecretKeySpec {
Expand Down
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