Merge pull request #28 from imsglc/credential-type-mods

Credential type mods + Signature Verification + 50% of Proof
This commit is contained in:
Markus Gylling 2022-06-29 22:12:35 +02:00 committed by GitHub
commit cb7a98f378
11 changed files with 339 additions and 83 deletions

View File

@ -10,6 +10,31 @@
<dependency>
<groupId>org.1edtech</groupId>
<artifactId>inspector-core</artifactId>
</dependency>
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15to18</artifactId>
<version>1.65</version>
</dependency>
<dependency>
<groupId>com.auth0</groupId>
<artifactId>auth0</artifactId>
<version>1.20.0</version>
</dependency>
<dependency>
<groupId>com.auth0</groupId>
<artifactId>jwks-rsa</artifactId>
<version>0.12.0</version>
</dependency>
<dependency>
<groupId>com.auth0</groupId>
<artifactId>java-jwt</artifactId>
<version>3.10.3</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.0.12.RELEASE</version>
</dependency>
</dependencies>
</project>

View File

@ -25,8 +25,9 @@ public class Credential extends GeneratedObject {
final Resource resource;
final JsonNode jsonData;
final Credential.Type credentialType;
final String jwt;
public Credential(Resource resource, JsonNode data) {
public Credential(Resource resource, JsonNode data, String jwt) {
super(ID, GeneratedObject.Type.INTERNAL);
checkNotNull(resource, resource.getType(), data);
ResourceType type = resource.getType();
@ -34,10 +35,10 @@ public class Credential extends GeneratedObject {
"Unrecognized payload type: " + type.getName());
this.resource = resource;
this.jsonData = data;
this.jwt = jwt;
ArrayNode typeNode = (ArrayNode)jsonData.get("type");
this.credentialType = Credential.Type.valueOf(typeNode);
}
public Resource getResource() {
@ -51,6 +52,10 @@ public class Credential extends GeneratedObject {
public Credential.Type getCredentialType() {
return credentialType;
}
public String getJwt() {
return jwt;
}
/**
* Get the canonical schema for this credential if such exists.

View File

@ -6,6 +6,7 @@ import static org.oneedtech.inspect.core.report.ReportUtil.onProbeException;
import static org.oneedtech.inspect.util.json.ObjectMapperCache.Config.DEFAULT;
import static org.oneedtech.inspect.vc.EndorsementInspector.ENDORSEMENT_KEY;
import static org.oneedtech.inspect.vc.util.JsonNodeUtil.getEndorsements;
import static com.google.common.base.Strings.isNullOrEmpty;
import java.net.URI;
import java.util.ArrayList;
@ -105,15 +106,20 @@ public class OB30Inspector extends VCInspector {
probeCount++;
accumulator.add(new InlineJsonSchemaProbe().run(crd, ctx));
//verify signatures TODO @Miles
probeCount++;
accumulator.add(new SignatureVerifierProbe().run(crd, ctx));
if(broken(accumulator)) return abort(ctx, accumulator, probeCount);
//If this credential was originally contained in a JWT we must validate the jwt and external proof.
if(!isNullOrEmpty(crd.getJwt())){
probeCount++;
accumulator.add(new SignatureVerifierProbe().run(crd, ctx));
if(broken(accumulator)) return abort(ctx, accumulator, probeCount);
}
//verify proofs TODO @Miles
probeCount++;
accumulator.add(new ProofVerifierProbe().run(crd, ctx));
if(broken(accumulator)) return abort(ctx, accumulator, probeCount);
//If this credential was not contained in a jwt it must have an internal proof.
if(isNullOrEmpty(crd.getJwt())){
probeCount++;
accumulator.add(new ProofVerifierProbe().run(crd, ctx));
if(broken(accumulator)) return abort(ctx, accumulator, probeCount);
}
//check refresh service if we are not already refreshed
probeCount++;
@ -147,8 +153,11 @@ public class OB30Inspector extends VCInspector {
EndorsementInspector subInspector = new EndorsementInspector.Builder().build();
for(JsonNode endorsementNode : endorsements) {
probeCount++;
Credential endorsement = new Credential(resource, endorsementNode);
accumulator.add(subInspector.run(resource, Map.of(ENDORSEMENT_KEY, endorsement)));
//TODO: @Markus @Miles, need to refactor to detect as this can be an internal or external proof credential.
//This will LIKELY come from two distinct sources in which case we would detect the type by property name.
//Third param to constructor: Compact JWT -> add third param after decoding. Internal Proof, null jwt string.
//Credential endorsement = new Credential(resource, endorsementNode);
//accumulator.add(subInspector.run(resource, Map.of(ENDORSEMENT_KEY, endorsement)));
}
}

View File

@ -2,12 +2,16 @@ package org.oneedtech.inspect.vc.probe;
import static java.nio.charset.StandardCharsets.UTF_8;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.Base64;
import java.util.Base64.Decoder;
import java.util.List;
import java.util.Optional;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.metadata.IIOMetadata;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.events.Attribute;
@ -22,6 +26,8 @@ import org.oneedtech.inspect.util.resource.ResourceType;
import org.oneedtech.inspect.util.resource.detect.TypeDetector;
import org.oneedtech.inspect.util.xml.XMLInputFactoryCache;
import org.oneedtech.inspect.vc.Credential;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
@ -44,13 +50,13 @@ public class CredentialTypeProbe extends Probe<Resource> {
if(type.isPresent()) {
resource.setType(type.get());
if(type.get() == ResourceType.PNG) {
crd = new Credential(resource, fromPNG(resource, context));
crd = fromPNG(resource, context);
} else if(type.get() == ResourceType.SVG) {
crd = new Credential(resource, fromSVG(resource, context));
crd = fromSVG(resource, context);
} else if(type.get() == ResourceType.JSON) {
crd = new Credential(resource, fromJson(resource, context));
crd = fromJson(resource, context);
} else if(type.get() == ResourceType.JWT) {
crd = new Credential(resource, fromJWT(resource, context));
crd = fromJWT(resource, context);
}
}
@ -71,12 +77,39 @@ public class CredentialTypeProbe extends Probe<Resource> {
* @param context
* @throws Exception
*/
private JsonNode fromPNG(Resource resource, RunContext context) throws Exception {
//TODO @Miles - note: iTxt chunk is either plain json or jwt
private Credential fromPNG(Resource resource, RunContext context) throws Exception {
try(InputStream is = resource.asByteSource().openStream()) {
ImageReader imageReader = ImageIO.getImageReadersByFormatName("png").next();
imageReader.setInput(ImageIO.createImageInputStream(is), true);
IIOMetadata metadata = imageReader.getImageMetadata(0);
String credentialString = null;
String jwtString = null;
String formatSearch = null;
JsonNode credential = null;
String[] names = metadata.getMetadataFormatNames();
int length = names.length;
for (int i = 0; i < length; i++)
{
//Check all names rather than limiting to PNG format to remain malleable through any library changes. (Could limit to "javax_imageio_png_1.0")
formatSearch = getOpenBadgeCredentialNodeText(metadata.getAsTree(names[i]));
if(formatSearch != null) { credentialString = formatSearch; }
}
if(credentialString == null) { throw new IllegalArgumentException("No credential inside PNG"); }
credentialString = credentialString.trim();
if(credentialString.charAt(0) != '{'){
//This is a jwt. Fetch either the 'vc' out of the payload and save the string for signature verification.
jwtString = credentialString;
credential = decodeJWT(credentialString,context);
}
else {
credential = buildNodeFromString(credentialString, context);
}
return new Credential(resource, credential, jwtString);
}
return null;
}
/**
@ -84,8 +117,10 @@ public class CredentialTypeProbe extends Probe<Resource> {
* @param context
* @throws Exception
*/
private JsonNode fromSVG(Resource resource, RunContext context) throws Exception {
private Credential fromSVG(Resource resource, RunContext context) throws Exception {
String json = null;
String jwtString = null;
JsonNode credential = null;;
try(InputStream is = resource.asByteSource().openStream()) {
XMLEventReader reader = XMLInputFactoryCache.getInstance().createXMLEventReader(is);
while(reader.hasNext()) {
@ -93,7 +128,8 @@ public class CredentialTypeProbe extends Probe<Resource> {
if(ev.isStartElement() && ev.asStartElement().getName().equals(OB_CRED_ELEM)) {
Attribute verifyAttr = ev.asStartElement().getAttributeByName(OB_CRED_VERIFY_ATTR);
if(verifyAttr != null) {
json = decodeJWT(verifyAttr.getValue());
jwtString = verifyAttr.getValue();
credential = decodeJWT(verifyAttr.getValue(), context);
break;
} else {
while(reader.hasNext()) {
@ -105,58 +141,90 @@ public class CredentialTypeProbe extends Probe<Resource> {
Characters chars = ev.asCharacters();
if(!chars.isWhiteSpace()) {
json = chars.getData();
credential = buildNodeFromString(json, context);
break;
}
}
}
}
}
if(json!=null) break;
}
}
}
if(credential!=null) break;
}
}
if(json == null) throw new IllegalArgumentException("No credential inside SVG");
return fromString(json, context);
if(credential == null) throw new IllegalArgumentException("No credential inside SVG");
return new Credential(resource, credential, jwtString);
}
/**
* Create a JsonNode object from a raw JSON resource.
* Create a Credential object from a raw JSON resource.
* @param context
*/
private JsonNode fromJson(Resource resource, RunContext context) throws Exception {
return fromString(resource.asByteSource().asCharSource(UTF_8).read(), context);
private Credential fromJson(Resource resource, RunContext context) throws Exception {
return new Credential(resource, buildNodeFromString(resource.asByteSource().asCharSource(UTF_8).read(), context), null);
}
/**
* Create a Credential object from a JWT resource.
* @param context
*/
private Credential fromJWT(Resource resource, RunContext context) throws Exception {
return new Credential(
resource,
decodeJWT(
resource.asByteSource().asCharSource(UTF_8).read(),
context
)
, resource.asByteSource().asCharSource(UTF_8).read()
);
}
/**
* Create a JsonNode object from a String.
*/
private JsonNode fromString(String json, RunContext context) throws Exception {
private JsonNode buildNodeFromString(String json, RunContext context) throws Exception {
return ((ObjectMapper)context.get(RunContext.Key.JACKSON_OBJECTMAPPER)).readTree(json);
}
/**
* Create a JsonNode object from a JWT resource.
* @param context
*/
private JsonNode fromJWT(Resource resource, RunContext context) throws Exception {
return fromString(decodeJWT(resource.asByteSource().asCharSource(UTF_8).read()), context);
}
/**
* Decode as per https://www.imsglobal.org/spec/ob/v3p0/#jwt-proof
* @return The decoded JSON String
*/
private String decodeJWT(String jwt) {
private JsonNode decodeJWT(String jwt, RunContext context) throws Exception {
List<String> parts = Splitter.on('.').splitToList(jwt);
if(parts.size() != 3) throw new IllegalArgumentException("invalid jwt");
final Decoder decoder = Base64.getUrlDecoder();
String joseHeader = new String(decoder.decode(parts.get(0)));
//For this step we are only deserializing the stored badge out of the payload. The entire jwt is stored separately for
//signature verification later.
String jwtPayload = new String(decoder.decode(parts.get(1)));
String jwsSignature = new String(decoder.decode(parts.get(2)));
//TODO @Miles
return null;
//Deserialize and fetch the 'vc' node from the object
JsonNode outerPayload = buildNodeFromString(jwtPayload, context);
JsonNode vcNode = outerPayload.get("vc");
return vcNode;
}
private String getOpenBadgeCredentialNodeText(Node node){
NamedNodeMap attributes = node.getAttributes();
//If this node is labeled with the attribute keyword: 'openbadgecredential' it is the right one.
if(attributes.getNamedItem("keyword") != null && attributes.getNamedItem("keyword").getNodeValue().equals("openbadgecredential")){
Node textAttribute = attributes.getNamedItem("text");
if(textAttribute != null) { return textAttribute.getNodeValue(); }
}
//iterate over all children depth first and search for the credential node.
Node child = node.getFirstChild();
while (child != null)
{
String nodeValue = getOpenBadgeCredentialNodeText(child);
if(nodeValue != null) { return nodeValue; }
child = child.getNextSibling();
}
//Return null if we haven't found anything at this recursive depth.
return null;
}
private static final QName OB_CRED_ELEM = new QName("https://purl.imsglobal.org/ob/v3p0", "credential");

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@ -1,5 +1,15 @@
package org.oneedtech.inspect.vc.probe;
import java.security.KeyFactory;
import java.security.Security;
import java.security.Signature;
import java.security.spec.X509EncodedKeySpec;
import org.bouncycastle.asn1.edec.EdECObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Hex;
import org.oneedtech.inspect.core.probe.Probe;
import org.oneedtech.inspect.core.probe.RunContext;
import org.oneedtech.inspect.core.report.ReportItems;
@ -23,5 +33,22 @@ public class ProofVerifierProbe extends Probe<Credential> {
return success(ctx);
}
public boolean validate(String pubkey, String signature, String timestamp, String message) throws Exception {
//TODO: continue this implementation.
//Pulled in bouncy castle library and made sure this sample compiled only.
final var provider = new BouncyCastleProvider();
Security.addProvider(provider);
final var byteKey = Hex.decode(pubkey);
final var pki = new SubjectPublicKeyInfo(new AlgorithmIdentifier(EdECObjectIdentifiers.id_Ed25519), byteKey);
final var pkSpec = new X509EncodedKeySpec(pki.getEncoded());
final var kf = KeyFactory.getInstance("ed25519", provider);
final var publicKey = kf.generatePublic(pkSpec);
final var signedData = Signature.getInstance("ed25519", provider);
signedData.initVerify(publicKey);
signedData.update(timestamp.getBytes());
signedData.update(message.getBytes());
return signedData.verify(Hex.decode(signature));
}
public static final String ID = ProofVerifierProbe.class.getSimpleName();
}

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@ -1,9 +1,34 @@
package org.oneedtech.inspect.vc.probe;
import static com.google.common.base.Strings.isNullOrEmpty;
import java.math.BigInteger;
import java.nio.charset.StandardCharsets;
import java.security.KeyFactory;
import java.security.PublicKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.RSAPublicKeySpec;
import java.util.List;
import java.util.Base64;
import java.util.Base64.Decoder;
import org.oneedtech.inspect.core.probe.Probe;
import org.oneedtech.inspect.core.probe.RunContext;
import org.oneedtech.inspect.core.report.ReportItems;
import org.oneedtech.inspect.vc.Credential;
import org.springframework.util.Base64Utils;
import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.AlgorithmMismatchException;
import com.auth0.jwt.exceptions.InvalidClaimException;
import com.auth0.jwt.exceptions.SignatureVerificationException;
import com.auth0.jwt.exceptions.TokenExpiredException;
import com.auth0.jwt.interfaces.DecodedJWT;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.base.Splitter;
/**
* A Probe that verifies credential signatures
@ -17,11 +42,74 @@ public class SignatureVerifierProbe extends Probe<Credential> {
@Override
public ReportItems run(Credential crd, RunContext ctx) throws Exception {
//TODO @Miles -- if sigs fail, report OutCome.Fatal
try {
verifySignature(crd);
} catch (Exception e) {
return fatal("Error verifying jwt signature: " + e.getMessage(), ctx);
}
return success(ctx);
}
private void verifySignature(Credential crd) throws Exception {
DecodedJWT decodedJwt = null;
String jwt = crd.getJwt();
if(isNullOrEmpty(jwt)) throw new IllegalArgumentException("invalid jwt");
List<String> parts = Splitter.on('.').splitToList(jwt);
if(parts.size() != 3) throw new IllegalArgumentException("invalid jwt");
final Decoder decoder = Base64.getUrlDecoder();
String joseHeader = new String(decoder.decode(parts.get(0)));
ObjectMapper mapper = new ObjectMapper();
JsonNode headerObj = mapper.readTree(joseHeader);
//MUST be "RS256"
JsonNode alg = headerObj.get("alg");
if(alg == null || !alg.textValue().equals("RS256")) { throw new Exception("alg must be present and must be 'RS256'"); }
//TODO: decoded jwt will check timestamps, but shall we explicitly break these out?
//Option 1, fetch directly from header
JsonNode jwk = headerObj.get("jwk");
//Option 2, fetch from a hosting url
JsonNode kid = headerObj.get("kid");
if(jwk == null && kid == null) { throw new Exception("Key must present in either jwk or kid value."); }
if(kid != null){
//TODO @Miles load jwk JsonNode from url and do the rest the same below. Need to set up testing.
String kidUrl = kid.textValue();
}
//Clean up may be required. Currently need to cleanse extra double quoting.
String modulusString = jwk.get("n").textValue();
String exponentString = jwk.get("e").textValue();
BigInteger modulus = new BigInteger(1, org.springframework.util.Base64Utils.decodeFromUrlSafeString(modulusString));
BigInteger exponent = new BigInteger(1, org.springframework.util.Base64Utils.decodeFromUrlSafeString(exponentString));
PublicKey pub = KeyFactory.getInstance("RSA").generatePublic(new RSAPublicKeySpec(modulus, exponent));
Algorithm algorithm = Algorithm.RSA256((RSAPublicKey)pub, null);
JWTVerifier verifier = JWT.require(algorithm)
.build(); //Reusable verifier instance
try {
decodedJwt = verifier.verify(jwt);
}
catch(SignatureVerificationException ex){
throw new Exception("JWT Invalid signature", ex);
}
catch(AlgorithmMismatchException ex){
throw new Exception("JWT Algorithm mismatch", ex);
}
catch(TokenExpiredException ex){
throw new Exception("JWT Token expired", ex);
}
catch(InvalidClaimException ex){
throw new Exception("JWT, one or more claims are invalid", ex);
}
}
public static final String ID = SignatureVerifierProbe.class.getSimpleName();

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@ -32,7 +32,6 @@ public class OB30Tests {
});
}
@Disabled
@Test
void testSimplePNGPlainValid() {
assertDoesNotThrow(()->{
@ -42,7 +41,6 @@ public class OB30Tests {
});
}
@Disabled
@Test
void testSimplePNGJWTValid() {
assertDoesNotThrow(()->{

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@ -1,7 +1,7 @@
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:openbadges="https://purl.imsglobal.org/ob/v3p0" x="0px" y="0px" viewBox="0 0 1000 1000" enable-background="new 0 0 1000 1000" xml:space="preserve">
<openbadges:credential verify="eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.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.G7W8od9rSZRsVyk26rXjg_fH2CyUihwNpepd6tWgLt_UHC1vUU0Clox8IicnOSkMyYEqAuNZAdCC9_35i1oUcyj1c076Aa0dsVQ2fFVuQPqXBlyZWcBmo5jqOK6R9NHzRAYXwLRXgrB8gz3lSK55cnHTnMtkpXXcUcHkS5ylWbXCLeOWKoygOCuxRN3N6kP-0HOyuk15PWlnkJ2zEKz2pBtVPaNEydcT0kEtoHFMEWVwqo6rnGV-Ea3M7ssDt3145mcl-DVYLXmBVdT8KoO47QAOBaVMR6k-hgrHNBcdhpI-o6IvLIFsGLgrNvWN67i8Z7Baum1mP-HBpsAigdmIpA"></openbadges:credential>
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],
"id": "http://example.edu/credentials/3732",
"type": [
"VerifiableCredential",
"OpenBadgeCredential"
],
"issuer": {
"id": "https://example.edu/issuers/565049",
"type": [
"Profile"
],
"name": "Example University"
},
"issuanceDate": "2010-01-01T00:00:00Z",
"name": "Example University Degree",
"credentialSubject": {
"id": "did:example:ebfeb1f712ebc6f1c276e12ec21",
"type": [
"AchievementSubject"
]
},
"proof": [
{
"type": "Ed25519Signature2020",
"created": "2022-06-09T22:56:28Z",
"verificationMethod": "https://example.edu/issuers/565049#key-1",
"proofPurpose": "assertionMethod",
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],
"id": "http://example.edu/credentials/3732",
"@context": [
"https://www.w3.org/2018/credentials/v1",
"https://imsglobal.github.io/openbadges-specification/context.json",
"https://w3id.org/security/suites/ed25519-2020/v1"
],
"id": "http://example.edu/credentials/3732",
"type": [
"VerifiableCredential",
"OpenBadgeCredential"
],
"issuer": {
"id": "https://example.edu/issuers/565049",
"type": [
"VerifiableCredential",
"OpenBadgeCredential"
"Profile"
],
"issuer": {
"id": "https://example.edu/issuers/565049",
"type": [
"Profile"
],
"name": "Example University"
},
"issuanceDate": "2010-01-01T00:00:00Z",
"name": "Example University Degree",
"credentialSubject": {
"id": "did:example:ebfeb1f712ebc6f1c276e12ec21",
"type": [
"AchievementSubject"
]
},
"proof": [
{
"type": "Ed25519Signature2020",
"created": "2022-06-09T22:56:28Z",
"verificationMethod": "https://example.edu/issuers/565049#key-1",
"proofPurpose": "assertionMethod",
"proofValue": "z58ieJCh4kN6eE2Vq4TyYURKSC4hWWEK7b75NNUL2taZMhKqwTteuByG1wRoGDdCqqNLW5Gq1diUi4qyZ63tQRtyN"
}
"name": "Example University"
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"issuanceDate": "2010-01-01T00:00:00Z",
"name": "Example University Degree",
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"id": "did:example:ebfeb1f712ebc6f1c276e12ec21",
"type": [
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