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Fix Expiration Date Checking in OpenID4VPPresentationActivity
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Fix expiration date checking in OpenID4VPPresentationActivity
and allow issuance time to be the same as now. Also added
tests to OpenID4VPTest to confirm expected behavior for
expired, not yet issued, and not yet valid JWTs.

Tested-by: Adding examples to OpenID4VPTest.kt

Signed-off-by: Suzanna Jiwani <[email protected]>
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@suzannajiwani
suzannajiwani committed Nov 15, 2024
1 parent aeea796 commit efd9469
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Showing 2 changed files with 237 additions and 4 deletions.
8 changes: 4 additions & 4 deletions ...java/com/android/identity_credential/wallet/presentation/OpenID4VPPresentationActivity.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -874,17 +874,17 @@ private class TimeChecks : JWTClaimsSetVerifier<SecurityContext> {
var exp: Instant? = null
if (expiration != null) {
exp = Instant.fromEpochMilliseconds(expiration.time)
if (exp >= now) {
throw BadJWTException("Expired JWT ($exp >= $now)")
if (exp <= now) {
throw BadJWTException("Expired JWT ($exp <= $now)")
}
}

val issuance = claimsSet.issueTime
var iat: Instant? = null
if (issuance != null) {
iat = Instant.fromEpochMilliseconds(issuance.time)
if (now <= iat) {
throw BadJWTException("JWT issued in the future ($now <= $iat)")
if (now < iat) {
throw BadJWTException("JWT issued in the future ($now < $iat)")
}

if (exp != null) {
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233 changes: 233 additions & 0 deletions wallet/src/test/java/com/android/identity_credential/wallet/OpenID4VPTest.kt
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Original file line number Diff line number Diff line change
@@ -1,18 +1,53 @@
package com.android.identity_credential.wallet

import com.android.identity.crypto.Algorithm
import com.android.identity.crypto.Crypto
import com.android.identity.crypto.EcCurve
import com.android.identity.crypto.EcPrivateKey
import com.android.identity.crypto.X509Cert
import com.android.identity.crypto.X509CertChain
import com.android.identity.crypto.X509CertificateCreateOption
import com.android.identity.crypto.X509CertificateExtension
import com.android.identity.crypto.create
import com.android.identity.crypto.javaPrivateKey
import com.android.identity.crypto.javaPublicKey
import com.android.identity.crypto.javaX509Certificate
import com.android.identity.document.DocumentRequest
import com.android.identity.issuance.CredentialFormat
import com.android.identity.util.toBase64Url
import com.android.identity_credential.wallet.presentation.DescriptorMap
import com.android.identity_credential.wallet.presentation.createPresentationSubmission
import com.android.identity_credential.wallet.presentation.formatAsDocumentRequest
import com.android.identity_credential.wallet.presentation.getAuthRequestFromJwt
import com.android.identity_credential.wallet.presentation.parsePathItem
import com.nimbusds.jose.JOSEObjectType
import com.nimbusds.jose.JWSAlgorithm
import com.nimbusds.jose.JWSHeader
import com.nimbusds.jose.JWSSigner
import com.nimbusds.jose.crypto.ECDSASigner
import com.nimbusds.jose.jwk.Curve
import com.nimbusds.jose.jwk.ECKey
import com.nimbusds.jose.util.Base64
import com.nimbusds.jwt.JWTClaimsSet
import com.nimbusds.jwt.SignedJWT
import kotlinx.datetime.Clock
import kotlinx.datetime.DateTimePeriod
import kotlinx.datetime.Instant
import kotlinx.datetime.TimeZone
import kotlinx.datetime.plus
import kotlinx.serialization.json.Json.Default.parseToJsonElement
import kotlinx.serialization.json.jsonArray
import kotlinx.serialization.json.jsonObject
import org.bouncycastle.asn1.ASN1ObjectIdentifier
import org.bouncycastle.asn1.x509.ExtendedKeyUsage
import org.bouncycastle.asn1.x509.Extension
import org.bouncycastle.asn1.x509.KeyPurposeId
import org.bouncycastle.asn1.x509.KeyUsage
import org.junit.Assert
import org.junit.Test
import java.security.interfaces.ECPrivateKey
import java.security.interfaces.ECPublicKey
import kotlin.time.Duration

class OpenID4VPTest {

Expand Down Expand Up @@ -46,6 +81,173 @@ class OpenID4VPTest {
"RlIjoiZGlyZWN0X3Bvc3Quand0In0.6VvDuIZ6QhLbzVyncJ-3mEkykYAadSqmgpjxd72j6zxeivNxGpnPh0" +
"c7YxCHbGNHY47ZZ7STu6LxbJY6EOWHHw"

private fun createSingleUseReaderKey(): Pair<EcPrivateKey, X509CertChain> {
val now = Clock.System.now()
val validFrom = now.plus(DateTimePeriod(minutes = -10), TimeZone.currentSystemDefault())
val validUntil = now.plus(DateTimePeriod(minutes = 10), TimeZone.currentSystemDefault())
val readerKey = Crypto.createEcPrivateKey(EcCurve.P256)

val extensions = mutableListOf<X509CertificateExtension>()
extensions.add(
X509CertificateExtension(
Extension.keyUsage.toString(),
true,
KeyUsage(KeyUsage.digitalSignature).encoded
)
)
extensions.add(
X509CertificateExtension(
Extension.extendedKeyUsage.toString(),
true,
ExtendedKeyUsage(
KeyPurposeId.getInstance(ASN1ObjectIdentifier("1.0.18013.5.1.2"))
).encoded
)
)
val readerKeySubject = "CN=OWF IC Online Verifier Single-Use Reader Key"

// TODO: for now, instead of using the per-site Reader Root generated at first run, use the
// well-know OWF IC Reader root checked into Git.
val owfIcReaderCert = X509Cert.fromPem("""
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
""".trimIndent())

val owfIcReaderRoot = EcPrivateKey.fromPem("""
-----BEGIN PRIVATE KEY-----
MFcCAQAwEAYHKoZIzj0CAQYFK4EEACIEQDA+AgEBBDDxgrZBXnoO54/hZM2DAGrByoWRatjH9hGs
lrW+vvdmRHBgS+ss56uWyYor6W7ah9ygBwYFK4EEACI=
-----END PRIVATE KEY-----
""".trimIndent(),
owfIcReaderCert.ecPublicKey)
val owfIcReaderRootSignatureAlgorithm = Algorithm.ES384
val owfIcReaderRootIssuer = owfIcReaderCert.javaX509Certificate.issuerX500Principal.name

val readerKeyCertificate = X509Cert.create(
readerKey.publicKey,
owfIcReaderRoot,
owfIcReaderCert,
owfIcReaderRootSignatureAlgorithm,
"1",
readerKeySubject,
owfIcReaderRootIssuer,
validFrom,
validUntil,
setOf(
X509CertificateCreateOption.INCLUDE_SUBJECT_KEY_IDENTIFIER,
X509CertificateCreateOption.INCLUDE_AUTHORITY_KEY_IDENTIFIER_FROM_SIGNING_KEY_CERTIFICATE
),
extensions
)
return Pair(
readerKey,
X509CertChain(listOf(readerKeyCertificate) + owfIcReaderCert)
)
}

private fun generateSignedJWT(claimsSet: JWTClaimsSet) : SignedJWT {
val (singleUseReaderKeyPriv, singleUseReaderKeyCertChain) = createSingleUseReaderKey()
val readerPub = singleUseReaderKeyPriv.publicKey.javaPublicKey as ECPublicKey
val readerPriv = singleUseReaderKeyPriv.javaPrivateKey as ECPrivateKey
val readerKey = ECKey(
Curve.P_256,
readerPub,
readerPriv,
null,
null,
null,
null,
null,
null,
null,
null,
null
)

val readerX5c = singleUseReaderKeyCertChain.certificates.map { cert ->
Base64.from(cert.encodedCertificate.toBase64Url())
}

val signedJWT = SignedJWT(
JWSHeader.Builder(JWSAlgorithm.ES256)
.keyID(readerKey.keyID)
.x509CertChain(readerX5c)
.type(JOSEObjectType("oauth-authz-req+jwt"))
.build(),
claimsSet
)

val signer: JWSSigner = ECDSASigner(readerKey)
signedJWT.sign(signer)
return signedJWT
}

private fun generateClaimSet(
issuance: Instant,
expiration: Instant,
notBefore: Instant
): JWTClaimsSet =
JWTClaimsSet.parse("{\n" +
" \"response_type\": \"vp_token\",\n" +
" \"client_id\": \"example.id\",\n" +
" \"response_uri\": \"https://example.com\",\n" +
" \"response_mode\": \"direct_post.jwt\",\n" +
" \"presentation_definition\": {\n" +
" \"id\": \"4db74328-9e94-49bb-97b7-bbfcb2d11a06\",\n" +
" \"input_descriptors\": [\n" +
" {\n" +
" \"id\": \"8f76f19e-b161-4baf-a57a-fd129322a48c\",\n" +
" \"format\": {\n" +
" \"vc+sd-jwt\": {\n" +
" \"sd-jwt_alg_values\": [\n" +
" \"ES256\"\n" +
" ],\n" +
" \"kb-jwt_alg_values\": [\n" +
" \"ES256\"\n" +
" ]\n" +
" }\n" +
" },\n" +
" \"constraints\": {\n" +
" \"limit_disclosure\": \"required\",\n" +
" \"fields\": [\n" +
" {\n" +
" \"path\": [\n" +
" \"\$.age_equal_or_over.21\"\n" +
" ]\n" +
" },\n" +
" {\n" +
" \"path\": [\n" +
" \"\$.vct\"\n" +
" ],\n" +
" \"filter\": {\n" +
" \"type\": \"string\",\n" +
" \"enum\": [\n" +
" \"https://example.bmi.bund.de/credential/pid/1.0\",\n" +
" \"urn:eu.europa.ec.eudi:pid:1\"\n" +
" ]\n" +
" }\n" +
" }\n" +
" ]\n" +
" }\n" +
" }\n" +
" ]\n" +
" },\n" +
" \"exp\": ${expiration.epochSeconds},\n" +
" \"nbf\": ${notBefore.epochSeconds},\n" +
" \"iat\": ${issuance.epochSeconds},\n" +
" \"jti\": \"39543149-470b-47ae-be96-213f8f4bc9fd\"\n" +
"}")

@Test
fun testParsePathBracketed() {
Assert.assertEquals(Pair("namespace", "dataElem"), parsePathItem("\"\$['namespace']['dataElem']\""))
Expand All @@ -56,6 +258,37 @@ class OpenID4VPTest {
Assert.assertEquals(Pair("credentialSubject", "dataElem"), parsePathItem("\"\$.dataElem\""))
}

@Test
fun timeChecks() {
val now = Clock.System.now()

val expiredClaimSet = generateClaimSet(
now.minus(Duration.parse("1m")),
now.minus(Duration.parse("1d")),
now.minus(Duration.parse("1m"))
)
val issuedInFutureClaimSet = generateClaimSet(
now.plus(Duration.parse("1m")),
now.plus(Duration.parse("1d")),
now.plus(Duration.parse("1m"))
)
val notYetValidClaimSet = generateClaimSet(
now.minus(Duration.parse("1m")),
now.plus(Duration.parse("1d")),
now.plus(Duration.parse("5m"))
)

Assert.assertThrows(RuntimeException::class.java) {
getAuthRequestFromJwt(generateSignedJWT(expiredClaimSet), "example.id")
}
Assert.assertThrows(RuntimeException::class.java) {
getAuthRequestFromJwt(generateSignedJWT(issuedInFutureClaimSet), "example.id")
}
Assert.assertThrows(RuntimeException::class.java) {
getAuthRequestFromJwt(generateSignedJWT(notYetValidClaimSet), "example.id")
}
}

@Test
fun eudiwJwtToPresentationSubmission() {
val authRequest = getAuthRequestFromJwt(SignedJWT.parse(eudiAgeOver18RequestObject), "verifier-backend.eudiw.dev")
Expand Down

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