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183
src/main/kotlin/eu/europa/ec/eudi/pidissuer/adapter/out/jose/ValidateCwtProof.kt
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| /* | ||
| * Copyright (c) 2023 European Commission | ||
| * | ||
| * 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 eu.europa.ec.eudi.pidissuer.adapter.out.jose | ||
|
|
||
| import arrow.core.raise.Raise | ||
| import arrow.core.raise.ensureNotNull | ||
| import arrow.core.toNonEmptyListOrNull | ||
| import com.authlete.cbor.* | ||
| import com.authlete.cose.COSEEC2Key | ||
| import com.authlete.cose.COSEProtectedHeader | ||
| import com.authlete.cose.COSESign1 | ||
| import com.authlete.cose.COSEVerifier | ||
| import com.authlete.cwt.CWT | ||
| import com.authlete.cwt.CWTClaimsSet | ||
| import com.nimbusds.jose.jwk.ECKey | ||
| import com.nimbusds.jose.jwk.JWK | ||
| import eu.europa.ec.eudi.pidissuer.domain.* | ||
| import eu.europa.ec.eudi.pidissuer.port.input.IssueCredentialError | ||
| import java.time.Clock | ||
| import java.time.Instant | ||
| import kotlin.io.encoding.Base64 | ||
| import kotlin.io.encoding.ExperimentalEncodingApi | ||
| import kotlin.time.Duration.Companion.minutes | ||
|
|
||
| context (Raise<IssueCredentialError.InvalidProof>) | ||
| fun validateCwtProof( | ||
| credentialIssuerId: CredentialIssuerId, | ||
| unvalidatedProof: UnvalidatedProof.Cwt, | ||
| expectedCNonce: CNonce, | ||
| credentialConfiguration: CredentialConfiguration, | ||
| ): CredentialKey { | ||
| val proofType = credentialConfiguration.proofTypesSupported[ProofTypeEnum.CWT] | ||
| ensureNotNull(proofType) { | ||
| IssueCredentialError.InvalidProof("credential configuration '${credentialConfiguration.id.value}' doesn't support 'jwt' proofs") | ||
| } | ||
| check(proofType is ProofType.Cwt) | ||
|
|
||
| return validateCwtProof(credentialIssuerId, unvalidatedProof, expectedCNonce, proofType) | ||
| } | ||
|
|
||
| context (Raise<IssueCredentialError.InvalidProof>) | ||
| fun validateCwtProof( | ||
| credentialIssuerId: CredentialIssuerId, | ||
| unvalidatedProof: UnvalidatedProof.Cwt, | ||
| expectedCNonce: CNonce, | ||
| proofType: ProofType.Cwt, | ||
| ): CredentialKey { | ||
| return CwtProofValidator.isValid( | ||
| Clock.systemDefaultZone(), | ||
| iss = null, | ||
| aud = credentialIssuerId, | ||
| nonce = expectedCNonce, | ||
| p = unvalidatedProof, | ||
| ).getOrElse { | ||
| raise(IssueCredentialError.InvalidProof("Reason: " + it.message)) | ||
| } | ||
| } | ||
|
|
||
| internal object CwtProofValidator { | ||
|
|
||
| fun isValid( | ||
| clock: Clock, | ||
| iss: String?, | ||
| aud: CredentialIssuerId, | ||
| nonce: CNonce, | ||
| p: UnvalidatedProof.Cwt, | ||
| ): Result<CredentialKey> = runCatching { | ||
| val (credentialKey, claimSet) = claimSet(p) | ||
| if (iss != null) { | ||
| require(iss == claimSet.iss) { | ||
| "Invalid CWT proof. Expecting iss=$iss found ${claimSet.iss}" | ||
| } | ||
| } | ||
| require(aud.toString() == claimSet.aud) { | ||
| "Invalid CWT proof. Expecting aud=$aud found ${claimSet.aud}" | ||
| } | ||
| require(nonce.nonce == claimSet.nonce.toString(Charsets.UTF_8)) { | ||
| "Invalid CWT proof. Expecting nonce=${nonce.nonce}" | ||
| } | ||
| val claimSetIat = requireNotNull(claimSet.iat) { | ||
| "Invalid CWT proof. Missing iat" | ||
| } | ||
| val now = Instant.now() | ||
| val skew = 3.minutes.inWholeSeconds // seconds | ||
| val range = now.minusSeconds(skew).epochSecond..now.plusSeconds(skew).epochSecond | ||
| require(claimSetIat.toInstant().epochSecond in range) { | ||
| "Invalid CWT proof. Invalid iat" | ||
| } | ||
| credentialKey | ||
| } | ||
|
|
||
| private fun claimSet(p: UnvalidatedProof.Cwt): Pair<CredentialKey, CWTClaimsSet> { | ||
| val cwt = ensureIsCWT(p) | ||
| val sign1 = ensureContainsSignOneMessage(cwt) | ||
| val credentialKey = verifySignature(sign1) | ||
| return credentialKey to claimSet(sign1) | ||
| } | ||
|
|
||
| @OptIn(ExperimentalEncodingApi::class) | ||
| private fun ensureIsCWT(p: UnvalidatedProof.Cwt): CWT { | ||
| val cwtInBytes = Base64.UrlSafe.decode(p.cwt) | ||
| val cborItem = CBORDecoder(cwtInBytes).next() | ||
| require(cborItem is CWT) { "Not CBOR CWT" } | ||
| return cborItem | ||
| } | ||
|
|
||
| private fun ensureContainsSignOneMessage(cwt: CWT): COSESign1 { | ||
| val message = cwt.message | ||
| require(message is COSESign1) { "CWT does not contain a COSE Sign one message" } | ||
| return message | ||
| } | ||
|
|
||
| private fun verifySignature(sign1: COSESign1): CredentialKey { | ||
| val credentialKey = ensureValidProtectedHeader(sign1) | ||
| val coseKey = when (credentialKey) { | ||
| is CredentialKey.DIDUrl -> error("Unsupported") | ||
| is CredentialKey.Jwk -> { | ||
| require(credentialKey.value is ECKey) | ||
| credentialKey.value.toPublicKey() | ||
| } | ||
|
|
||
| is CredentialKey.X5c -> { | ||
| credentialKey.certificate.publicKey | ||
| } | ||
| } | ||
| require(COSEVerifier(coseKey).verify(sign1)) { "Invalid signature" } | ||
| return credentialKey | ||
| } | ||
|
|
||
| private fun ensureValidProtectedHeader(sign1: COSESign1): CredentialKey { | ||
| val pHeader: COSEProtectedHeader = sign1.protectedHeader | ||
| require("openid4vci-proof+cwt" == pHeader.contentType) { "Invalid content type ${pHeader.contentType}" } | ||
|
|
||
| val coseKey = run { | ||
| val coseKeyAsByteString = pHeader.pairs.firstOrNull { (key, value) -> | ||
| key is CBORString && key.value == "COSE_Key" && | ||
| value is CBORByteArray | ||
| }?.value as CBORByteArray? | ||
| val cborItem = coseKeyAsByteString?.let { CBORDecoder(it.value).next() } | ||
|
|
||
| cborItem?.takeIf { it is CBORPairList }?.let { item -> | ||
| check(item is CBORPairList) | ||
| COSEEC2Key(item.pairs) | ||
| } | ||
| } | ||
|
|
||
| val x5cChain = pHeader.x5Chain.orEmpty() | ||
| require(!(null != coseKey && x5cChain.isNotEmpty())) { | ||
| "Cannot have both a COSE_Key and x5c chain" | ||
| } | ||
| return if (coseKey != null) { | ||
| val authJwk = coseKey.toJwk() | ||
| val jwk: JWK = JWK.parse(authJwk) | ||
| require(jwk is ECKey) | ||
| CredentialKey.Jwk(jwk) | ||
| } else { | ||
| CredentialKey.X5c(checkNotNull(x5cChain.toNonEmptyListOrNull())) | ||
| } | ||
| } | ||
|
|
||
| private fun claimSet(sign1: COSESign1): CWTClaimsSet { | ||
| val payload = sign1.payload | ||
| val parsed = payload.parse() | ||
| val listOfPairs = CBORDecoder(parsed as ByteArray).next() as CBORPairList | ||
| return CWTClaimsSet(listOfPairs.pairs) | ||
| } | ||
| } | ||
|
|
||
| private operator fun CBORPair.component1(): CBORItem = key | ||
| private operator fun CBORPair.component2(): CBORItem = value |
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