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feat(pollux): [ATL-2640] JWT Presentation Signature Verification Using DidResolver #212
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CryptoKnightIOG
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ATL-2640-JWT-Presentation-Signature-Verification-Using-DidResolver
Dec 8, 2022
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98 changes: 98 additions & 0 deletions
98
pollux/lib/vc-jwt/src/main/scala/io/iohk/atala/pollux/vc/jwt/JWTVerification.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| package io.iohk.atala.pollux.vc.jwt | ||
| import com.nimbusds.jose.jwk.* | ||
| import com.nimbusds.jose.jwk.gen.* | ||
| import com.nimbusds.jose.util.Base64URL | ||
| import io.circe | ||
| import io.circe.generic.auto.* | ||
| import io.circe.parser.decode | ||
| import io.circe.syntax.* | ||
| import io.circe.{Decoder, Encoder, HCursor, Json} | ||
| import io.iohk.atala.pollux.vc.jwt.schema.{SchemaResolver, SchemaValidator} | ||
| import net.reactivecore.cjs.validator.Violation | ||
| import net.reactivecore.cjs.{DocumentValidator, Loader} | ||
| import pdi.jwt.* | ||
| import zio.prelude.* | ||
| import zio.{IO, NonEmptyChunk, Task, ZIO} | ||
|
|
||
| import java.security.spec.{ECParameterSpec, ECPublicKeySpec} | ||
| import java.security.{KeyPairGenerator, PublicKey} | ||
| import java.time.temporal.{Temporal, TemporalAmount, TemporalUnit} | ||
| import java.time.{Clock, Instant, ZonedDateTime} | ||
| import java.util | ||
| import scala.util.{Failure, Success, Try} | ||
|
|
||
| object JWTVerification { | ||
| def validateEncodedJwt[T](jwt: JWT)( | ||
| didResolver: DidResolver | ||
| )(decoder: String => IO[String, T])(issuerDidExtractor: T => String): IO[String, Boolean] = { | ||
| val decodeJWT = ZIO | ||
| .fromTry(JwtCirce.decodeRawAll(jwt.value, JwtOptions(false, false, false))) | ||
| .mapError(_.getMessage) | ||
|
|
||
| val extractAlgorithm = | ||
| for { | ||
| decodedJwtTask <- decodeJWT | ||
| (header, _, _) = decodedJwtTask | ||
| algorithm <- Validation | ||
| .fromOptionWith("An algorithm must be specified in the header")(JwtCirce.parseHeader(header).algorithm) | ||
| .toZIO | ||
| } yield algorithm | ||
|
|
||
| val loadDidDocument = | ||
| for { | ||
| decodedJwtTask <- decodeJWT | ||
| (_, claim, _) = decodedJwtTask | ||
| decodedClaim <- decoder(claim) | ||
| extractIssuerDid = issuerDidExtractor(decodedClaim) | ||
| resolvedDidDocument <- resolve(extractIssuerDid)(didResolver) | ||
| } yield resolvedDidDocument | ||
|
|
||
| for { | ||
| results <- loadDidDocument validatePar extractAlgorithm | ||
| (didDocument, algorithm) = results | ||
| verificationMethods <- extractVerificationMethods(didDocument, algorithm) | ||
| } yield validateEncodedJwt(jwt, verificationMethods) | ||
| } | ||
|
|
||
| def validateEncodedJwt(jwt: JWT, publicKey: PublicKey): Boolean = | ||
| JwtCirce.isValid(jwt.value, publicKey) | ||
|
|
||
| def validateEncodedJwt(jwt: JWT, verificationMethods: IndexedSeq[VerificationMethod]): Boolean = { | ||
| verificationMethods.exists(verificationMethod => | ||
| toPublicKey(verificationMethod).exists(publicKey => validateEncodedJwt(jwt, publicKey)) | ||
| ) | ||
| } | ||
|
|
||
| private def resolve(issuerDid: String)(didResolver: DidResolver): IO[String, DIDDocument] = { | ||
| didResolver | ||
| .resolve(issuerDid) | ||
| .flatMap( | ||
| _ match | ||
| case (didResolutionSucceeded: DIDResolutionSucceeded) => | ||
| ZIO.succeed(didResolutionSucceeded.didDocument) | ||
| case (didResolutionFailed: DIDResolutionFailed) => ZIO.fail(didResolutionFailed.error.toString) | ||
| ) | ||
| } | ||
|
|
||
| private def extractVerificationMethods( | ||
| didDocument: DIDDocument, | ||
| jwtAlgorithm: JwtAlgorithm | ||
| ): IO[String, IndexedSeq[VerificationMethod]] = { | ||
| Validation | ||
| .fromPredicateWith("No PublicKey to validate against found")( | ||
| didDocument.verificationMethod.filter(verification => verification.`type` == jwtAlgorithm.name) | ||
| )(_.nonEmpty) | ||
| .toZIO | ||
| } | ||
|
|
||
| // TODO Implement other key types | ||
| def toPublicKey(verificationMethod: VerificationMethod): Option[PublicKey] = { | ||
| for { | ||
| publicKeyJwk <- verificationMethod.publicKeyJwk | ||
| curve <- publicKeyJwk.crv | ||
| x <- publicKeyJwk.x.map(Base64URL.from) | ||
| y <- publicKeyJwk.y.map(Base64URL.from) | ||
| d <- publicKeyJwk.d.map(Base64URL.from) | ||
| } yield new ECKey.Builder(Curve.parse(curve), x, y).d(d).build().toPublicKey | ||
| } | ||
| } | ||
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there is a duplication of 34-35 and 43-44 lines where the document is decoded from JWT.
does it make sense to separate these stages: decoding, raw-parsing, validation, verification, etc? ...instead of doing everything in one method?
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Yes, I will be doing refactoring as I go.