public async Task <bool> IsValidAsync(
TokenValidationArgs args,
string schemeOwnerAccessToken,
CancellationToken token = default)
{
if (!_decodedJwtValidator.IsIShareCompliant(args))
{
return(false);
}
try
{
var validationArgs = new CertificateValidationArgs(
CertificateUtilities.FromBase64Der(args.AssertionModel.Certificates.First()),
args.Issuer,
args.AssertionModel.Certificates.Skip(1).Select(CertificateUtilities.FromBase64Der));
return(await _jwtCertificateValidator.IsValidAsync(validationArgs, schemeOwnerAccessToken, token));
}
catch (Exception e)
{
_logger.LogError(e, "Couldn't create proper CertificateValidationArgs. Certificates are corrupted.");
return(false);
}
}
public void IsIShareCompliant_HeaderHasNoAlg_ReturnsFalse()
{
var now = DateTime.UtcNow;
var jwtContent =
$@"{{
""typ"": ""JWT"",
""x5c"": [""{ Constants.AbcParty.PublicKeyBase64Der }""]
}}
.
{{
""iss"": ""{Constants.SchemeOwner.ClientId}"",
""sub"": ""{Constants.SchemeOwner.ClientId}"",
""aud"": ""{Constants.AbcParty.ClientId}"",
""jti"": ""{Guid.NewGuid()}"",
""exp"": ""{JwtUtilities.DateTimeToEpoch(now.AddSeconds(30))}"",
""iat"": ""{JwtUtilities.DateTimeToEpoch(now)}""
}}";
var jwtToken = JwtUtilities.SignJwt(jwtContent, Constants.AbcParty.PrivateKey);
var assertionModel = CreateValidAssertionModel(jwtToken);
var args = new TokenValidationArgs(
assertionModel,
Constants.SchemeOwner.ClientId,
Constants.AbcParty.ClientId);
var result = _sut.IsIShareCompliant(args);
result.Should().BeFalse();
}
public void IsIShareCompliant_KeysNotFound_ReturnsFalse()
{
var assertionModel = new AssertionModel(new string[0], null, null);
var args = new TokenValidationArgs(assertionModel, "issuer", "audience");
var result = _sut.IsIShareCompliant(args);
result.Should().BeFalse();
}
IsIShareCompliant_JwtSecurityTokenHandlerValidationFailsDueToInvalidAudienceAndIssuerParams_ReturnsFalse()
{
var assertionModel = CreateValidAssertionModel();
var args = new TokenValidationArgs(assertionModel,
Constants.AbcParty.ClientId,
Constants.SchemeOwner.ClientId);
var result = _sut.IsIShareCompliant(args);
result.Should().BeFalse("JwtSecurityTokenHandler.ValidateToken throws exception which is handled.");
}
public void IsIShareCompliant_ValidClientAssertionPassed_ReturnsTrue()
{
var assertionModel = CreateValidAssertionModel();
var args = new TokenValidationArgs(
assertionModel,
Constants.SchemeOwner.ClientId,
Constants.AbcParty.ClientId);
var result = _sut.IsIShareCompliant(args);
result.Should().BeTrue();
}
public bool IsIShareCompliant(TokenValidationArgs args)
{
var keys = SecurityKeysExtractor.Extract(args.AssertionModel.Certificates);
if (keys.Count == 0)
{
return(false);
}
try
{
var handler = new JwtSecurityTokenHandler();
var validationParameters = CreateTokenValidationParameters(args.Issuer, args.Audience, keys);
handler.ValidateToken(args.AssertionModel.JwtToken, validationParameters, out var securityToken);
var jwtSecurityToken = (JwtSecurityToken)securityToken;
if (jwtSecurityToken.RawData != args.AssertionModel.JwtSecurityToken.RawData)
{
_logger.LogWarning("Keys that were used to verify this token might not be a part of this JWT.");
return(false);
}
if (IsHeaderInvalid(jwtSecurityToken.Header))
{
_logger.LogWarning($"Invalid JWT header. Jwt issued by {args.Issuer}.");
return(false);
}
if (IsPayloadInvalid(jwtSecurityToken.Payload))
{
_logger.LogWarning($"Invalid JWT payload. Jwt issued by {args.Issuer}.");
return(false);
}
return(true);
}
catch (Exception e)
{
_logger.LogError(e, "JWT token is not iSHARE compliant, validation failed.");
return(false);
}
}
public async Task IsValidAsync_EverythingValid_ReturnsTrue()
{
const string accessToken = "this_time_needed";
SetupDecodedJwtValidatorMock();
_jwtCertificateValidatorMock
.Setup(x => x.IsValidAsync(
It.IsAny <CertificateValidationArgs>(),
accessToken,
It.IsAny <CancellationToken>()))
.ReturnsAsync(true);
var args = new TokenValidationArgs(
CreateValidAssertionModel(),
Constants.SchemeOwner.ClientId,
Constants.AbcParty.ClientId);
var result = await _sut.IsValidAsync(args, accessToken, CancellationToken.None);
result.Should().BeTrue();
}
public void IsIShareCompliant_HeaderAlgNeqRS256_ReturnsFalse()
{
var signingAlgorithm = JwtUtilities.CreateSigningCredentials(
Constants.AbcParty.PrivateKey,
SecurityAlgorithms.RsaSsaPssSha512);
var jwtSecurityToken = JwtUtilities.CreateToken(
Constants.SchemeOwner.ClientId,
Constants.AbcParty.ClientId,
Constants.AbcParty.PublicKeyBase64Der,
signingAlgorithm);
var jwtToken = new JwtSecurityTokenHandler().WriteToken(jwtSecurityToken);
var assertionModel = CreateValidAssertionModel(jwtToken);
var args = new TokenValidationArgs(
assertionModel,
Constants.SchemeOwner.ClientId,
Constants.AbcParty.ClientId);
var result = _sut.IsIShareCompliant(args);
result.Should().BeFalse("Only RS256 should be supported.");
}
public void IsIShareCompliant_AssertionModelContainsDifferentJwtSecurityTokenThanItsString_ReturnsFalse()
{
var jwtToken = CreateValidJwtToken();
var handler = new JwtSecurityTokenHandler();
var jwtSecurityToken = handler.ReadJwtToken(jwtToken);
var assertionModel = new AssertionModel(
new[] { Constants.AbcParty.PublicKeyBase64Der },
jwtSecurityToken,
CreateValidJwtToken());
var args = new TokenValidationArgs(
assertionModel,
Constants.SchemeOwner.ClientId,
Constants.AbcParty.ClientId);
var result = _sut.IsIShareCompliant(args);
const string reason =
"JWT is valid because assertion model contains its public keys which were extracted " +
"from JwtSecurityToken. Those public keys applies for JwtToken (string). However, " +
"those public keys were not extracted from the token which is being validated, so " +
"validation should fail.";
result.Should().BeFalse(reason);
}
public void Constructor_ValidArguments_CreatesObject()
{
var result = new TokenValidationArgs(new AssertionModel(null, null, null), "valid", null);
result.Should().NotBeNull();
}
