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DRAFT!

We strongly recommend that service providers confirm all communications that take place with Auðkenni's system.

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What do I need to confirm?

...

To verify that the responses are coming from us, there is a so-called ".wellknown" endpoint that you can use to access information. Inside this endpoint, you can find the "jwks_uri" which is a path to the keys that can be used to verify that the response you receive is from our server.

An example of a .wellknown endpoint (replace "pfzww" with your Base URL):
https://pfzww.audkenni.is/sso/oauth2/realms/root/realms/audkenni/.well-known/openid-configuration

This endpoint will give you a response similar to this:

Code Block
{"request_parameter_supported":true,"introspection_signing_alg_values_supported":["ES384","PS384","ES256","PS256","PS512","EdDSA","HS512","RS384","RS256","RS512","HS256","ES512","HS384"],"introspection_encryption_alg_values_supported":["RSA-OAEP-256","ECDH-ES+A256KW","A128KW","A192KW","RSA-OAEP","ECDH-ES+A192KW","A256KW","ECDH-ES","ECDH-ES+A128KW","dir"],"claims_parameter_supported":false,"introspection_endpoint":"https://pfzww.audkenni.is:443/sso/oauth2/realms/root/realms/audkenni/introspect","check_session_iframe":"https://pfzww.audkenni.is:443/sso/oauth2/realms/root/realms/audkenni/connect/checkSession","scopes_supported":["signature","openid","profile"],"backchannel_logout_supported":true,"issuer":"https://pfzww.audkenni.is:443/sso/oauth2/realms/root/realms/audkenni","id_token_encryption_enc_values_supported":["A256GCM","A128GCM","A256CBC-HS512","A128CBC-HS256","A192CBC-HS384","A192GCM"],"acr_values_supported":["nexus","sim-auth","app-auth","app-certificate-choice","nexus-sign","default","newcards-auth","app-sign","app-sign-with-certificate","apidefault","sim-sign","sim","sim-sign-pkcs1","oldcards-auth"],"userinfo_encryption_enc_values_supported":["A256GCM","A128CBC-HS256","A192CBC-HS384","A192GCM","A128GCM","A256CBC-HS512"],"authorization_endpoint":"https://pfzww.audkenni.is:443/sso/oauth2/realms/root/realms/audkenni/authorize","request_object_encryption_enc_values_supported":["A128GCM","A256GCM","A192CBC-HS384","A256CBC-HS512","A128CBC-HS256","A192GCM"],"introspection_encryption_enc_values_supported":["A128CBC-HS256","A192CBC-HS384","A256GCM","A256CBC-HS512","A128GCM","A192GCM"],"rcs_request_encryption_alg_values_supported":["RSA1_5","dir","A192KW","RSA-OAEP-256","RSA-OAEP","A256KW","A128KW"],"claims_supported":["profile","name","locale"],"userinfo_signing_alg_values_supported":["ES256","HS512","ES512","HS384","RS256","ES384","HS256"],"rcs_request_signing_alg_values_supported":["RS512","PS384","PS256","HS256","HS384","ES512","RS256","RS384","HS512","ES384","ES256","PS512"],"token_endpoint_auth_methods_supported":["client_secret_post","private_key_jwt","self_signed_tls_client_auth","tls_client_auth","none","client_secret_basic"],"tls_client_certificate_bound_access_tokens":true,"backchannel_logout_session_supported":true,"token_endpoint":"https://pfzww.audkenni.is:443/sso/oauth2/realms/root/realms/audkenni/access_token","response_types_supported":["code token id_token","code","code id_token","device_code","id_token","code token","none","token","token id_token"],"revocation_endpoint_auth_methods_supported":["client_secret_post","private_key_jwt","self_signed_tls_client_auth","tls_client_auth","none","client_secret_basic"],"request_uri_parameter_supported":true,"rcs_response_encryption_enc_values_supported":["A256CBC-HS512","A192CBC-HS384","A256GCM","A128GCM","A192GCM","A128CBC-HS256"],"userinfo_encryption_alg_values_supported":["RSA-OAEP","dir","A256KW","RSA-OAEP-256","A128KW","A192KW","RSA1_5"],"grant_types_supported":["refresh_token","authorization_code","urn:openid:params:grant-type:ciba","urn:ietf:params:oauth:grant-type:uma-ticket","idm_delegation","urn:ietf:params:oauth:grant-type:jwt-bearer"],"end_session_endpoint":"https://pfzww.audkenni.is:443/sso/oauth2/realms/root/realms/audkenni/connect/endSession","rcs_request_encryption_enc_values_supported":["A256GCM","A256CBC-HS512","A192GCM","A128CBC-HS256","A128GCM","A192CBC-HS384"],"revocation_endpoint":"https://pfzww.audkenni.is:443/sso/oauth2/realms/root/realms/audkenni/token/revoke","version":"3.0","rcs_response_encryption_alg_values_supported":["dir","A256KW","RSA-OAEP-256","A128KW","A192KW","RSA-OAEP","RSA1_5"],"userinfo_endpoint":"https://pfzww.audkenni.is:443/sso/oauth2/realms/root/realms/audkenni/userinfo","token_endpoint_auth_signing_alg_values_supported":["RS512","RS384","RS256","ES512","HS256","HS384","PS512","ES384","PS256","ES256","HS512","PS384"],"require_request_uri_registration":true,"code_challenge_methods_supported":["plain","S256"],"id_token_encryption_alg_values_supported":["A128KW","A192KW","RSA-OAEP-256","RSA-OAEP","A256KW","RSA1_5","dir"],"jwks_uri":"https://pfzww.audkenni.is:443/sso/oauth2/realms/root/realms/audkenni/connect/jwk_uri","subject_types_supported":["public"],"id_token_signing_alg_values_supported":["RS384","RS256","PS512","ES512","HS384","HS256","PS256","ES256","PS384","ES384","RS512","HS512"],"registration_endpoint":"https://pfzww.audkenni.is:443/sso/oauth2/realms/root/realms/audkenni/register","request_object_signing_alg_values_supported":["RS256","ES512","PS512","RS384","HS512","ES256","ES384","HS256","HS384","PS384","RS512","PS256"],"request_object_encryption_alg_values_supported":["RSA-OAEP-256","A256KW","RSA-OAEP","RSA1_5","dir","A128KW","A192KW"],"rcs_response_signing_alg_values_supported":["PS256","ES384","RS512","ES256","HS512","PS384","RS256","ES512","PS512","HS384","HS256","RS384"]}

An example of a jwks_uri from the response (replace Base URL):
https://pfzww.audkenni.is/sso/oauth2/realms/root/realms/audkenni/connect/jwk_uri

This endpoint will give you a response similar to this:

...

This response hold keys you can use to verify the access_token and id_token from our system.

To verify the

...

You receive PKCS7 or PKCS1 signature, depending on which method you are using.

To verify PKCS7 signature

responses

There are ready-made tools available for most programming languages that can be used to verify PKCS7 JWT signatures. Below is a small code example in C# that hopefully makes it clearer:

Code Block
privatepublic bool validateSignPKCS7VerifyJwt(string toValidate)token, {string secretKey, string audience, string byte[] fromCMSString = null;
    SignedCms cms = null;issuer)
{
    try
    {
        byte[] fromCMSStringcertificateData = Convert.FromBase64String(toValidatesecretKey);
        X509Certificate2 cmscertificate = new SignedCmsX509Certificate2(certificateData);
        cms.Decode(fromCMSStringX509SecurityKey securityKey = new X509SecurityKey(certificate);         cms.CheckSignature(true);// Define token validation parameters
        var tokenHandler = new JwtSecurityTokenHandler();
        var }validationParameters = new TokenValidationParameters
 catch (Exception u)     {
         return   false;ValidateIssuerSigningKey = true,
  }     return true; }

The PKCS7 signature should contain the certificate of the person who is authenticating/signing. That certificate needs to be verified.

To verify PKCS1 signature

...

...

...

...

IssuerSigningKey

...

=

...

securityKey,

...

...

...

...

...

...

...

  ValidateIssuer =

...

true, // Set to true if you want to validate the issuer

...

...

...

...

   ValidIssuer =

...

issuer, // Replace with the

...

expected issuer

...

...

...

   ValidateAudience = true, // Set to

...

true

...

if you want to validate the audience

...

...

...

      ValidAudience = audience,

...

//

...

Replace

...

with the expected audience

...

...

...

...

   ValidateLifetime = true,

...

...

...

...

...

     ClockSkew =

...

TimeSpan.Zero

...

};

...

...

...

// Parse and validate the

...

token

...

...

...

  SecurityToken validatedToken;

...

...

  var principal

...

= tokenHandler.ValidateToken(token, validationParameters, out validatedToken);        // You can access the claims in the token via the principal.Claims property if needed.
        // For example:
        // var userId = principal.Claims.FirstOrDefault(c => c.Type == "sub")?.Value;        // If the token is valid, the validation process will not throw an exception.
        // So, if you reach this point, the token is valid.
        return true;
    }
    catch (Exception)
    {
        // If an exception is thrown, the token is not valid.
        return false;
    }
}

To verify the signatures

You receive PKCS7 or PKCS1 signature, depending on which method you are using.

To verify PKCS7 signature

There are ready-made tools available for most programming languages that can be used to verify PKCS7 signatures. Below is a small code example in C# that hopefully makes it clearer:

Code Block
private bool validateSignPKCS7(string toValidate)
{
    byte[] fromCMSString = null;
    SignedCms cms = null;
    try
    {
        fromCMSString = Convert.FromBase64String(toValidate);
        cms = new SignedCms();
        cms.Decode(fromCMSString);
        cms.CheckSignature(true);
    }
    catch (Exception u)
    {
        return false;
    }
    return true;
}

The PKCS7 signature should contain the certificate of the person who is authenticating/signing. That certificate needs to be verified.

To verify PKCS1 signature

When our system returns a PKCS1 response, the digital signature and the authenticated user's certificate are included separately. To verify the digital signature, we use:

  • The user’s certificate

  • The signature

  • The Hash string we sent in the beginning of the authentication process (“binding_content” in CIBA, the IDToken7 input in REST API)

There are ready-made tools available for most programming languages that can be used to verify PKCS1 signatures. Below is a small code example in C# that hopefully makes it clearer:

Code Block
private bool validatePKCS1Signature(string signatureFromAudkenni, string hashStringFromAuthenticationRequest, string usersCertFromAudkenni)
{
    byte[] orgHash = null;
    byte[] signedHash = null;
    byte[] certBytes = null;
    X509Certificate2 certificate = null;
    try
    {
        orgHash = Convert.FromBase64String(hashStringFromAuthenticationRequest);
        signedHash = Convert.FromBase64String(signatureFromAudkenni);
        certBytes = Convert.FromBase64String(usersCertFromAudkenni);
        certificate = new X509Certificate2(certBytes);
        RSA key = (RSA)certificate.PublicKey.Key;
        RSAPKCS1SignatureDeformatter formatter = new RSAPKCS1SignatureDeformatter(key);
        formatter.SetHashAlgorithm("SHA512");
        var result = formatter.VerifySignature(orgHash, signedHash);
        return result;
    }
    catch (CryptographicException e)
    {
        return false;
    }
}

To verify Certificates

To verify that the user's certificate you receive in the response is correct, you can use our intermediate certificate and the root certificate

See list of certificates here under “Skilríki” https://repo.audkenni.is/

For Testing environment:

For Production environment: