void QueryFWStatus()
{
try
{
var twin = Me.GetTwinAsync().Result;
var myFwid = Helpers.Hexify(Helpers.HashData(new byte[] { (byte)CurrentFwVersionNumber }, 0, 1));
var targetFwVersionNumber = twin.Properties.Desired["VersionNumber"];
Int64 currentReportedVersionNumber = -1;
if (twin.Properties.Reported.Contains("VersionNumber"))
{
currentReportedVersionNumber = (Int64)twin.Properties?.Reported["VersionNumber"];
}
// update our version number if hub version number is not current
if (currentReportedVersionNumber < 0 ||
CurrentFwVersionNumber != currentReportedVersionNumber ||
updateCurrentVersionNumber
)
{
TwinCollection t = new TwinCollection();
t["VersionNumber"] = CurrentFwVersionNumber;
Me.UpdateReportedPropertiesAsync(t).Wait();
updateCurrentVersionNumber = false;
}
// if the target version number is not current, then flag that we need a FW update
if (targetFwVersionNumber != CurrentFwVersionNumber.ToString())
{
FirmwareUpdateNeeded = true;
DesiredFwVersionNumber = targetFwVersionNumber;
Debug.WriteLine("Need to update myself");
}
else
{
FirmwareUpdateNeeded = false;
Debug.WriteLine("Firmware version is good");
}
// am I p0wned? If I'm P0wned I won't update myself
if (twin.Properties.Desired.Contains("POwned"))
{
P0wned = (bool)twin.Properties?.Desired["POwned"];
}
}
catch (Exception e)
{
Debug.WriteLine("Error querying status" + e.ToString());
throw;
}
return;
}
internal static bool ValidateBareCertificateWithBcrypt(X509Certificate2 certificate)
{
var deviceInfo = ExtensionDecoder.Decode(certificate);
// check we have a good extension
if (deviceInfo == null)
{
Helpers.Notify("Certificate does not have well-formed RIoT extension", true);
return(false);
}
var devIdPubKeyDEREncoded = deviceInfo.EncodedDeviceIDKey;
if (devIdPubKeyDEREncoded.Length != 65)
{
Helpers.Notify("Public key in extension has incorrect length", true);
return(false);
}
// We need to convert to the Windows key format before we can import
// #define BCRYPT_ECDSA_PUBLIC_P256_MAGIC 0x31534345 // ECS1
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa375520(v=vs.85).aspx
byte[] windowsEncodedKey = new byte[32 * 2 + 4 + 4];
// todo - endianess
byte[] magic = BitConverter.GetBytes((uint)0x31534345);
byte[] len = BitConverter.GetBytes((uint)32);
Array.Copy(magic, 0, windowsEncodedKey, 0, 4);
Array.Copy(len, 0, windowsEncodedKey, 4, 4);
Array.Copy(devIdPubKeyDEREncoded, 1, windowsEncodedKey, 8, 32);
Array.Copy(devIdPubKeyDEREncoded, 32 + 1, windowsEncodedKey, 8 + 32, 32);
var devIdPubKey = CngKey.Import(windowsEncodedKey, CngKeyBlobFormat.EccPublicBlob);
ECDsaCng verifier = new ECDsaCng(devIdPubKey);
ECDsaCng testSigner = new ECDsaCng(256);
var sig = testSigner.SignData(new byte[] { 1, 2, 3, 4 });
bool okx = testSigner.VerifyData(new byte[] { 1, 2, 3, 4 }, sig);
var bits = ExtensionDecoder.Decompose(certificate);
var tbsHash = Helpers.HashData(bits.Tbs, 0, bits.Tbs.Length);
bool ok = verifier.VerifyHash(tbsHash, bits.Signature);
return(true);
}
internal void MakeCertChain(DeviceBundle bundle, int chainLen, int fwidSeed)
{
var aliasCert = bundle.AliasCert;
DateTime now = DateTime.Now;
byte[] fwid = Helpers.HashData(new byte[1] {
0
}, 0, 1);
const int keyStrength = 256;
CryptoApiRandomGenerator rg = new CryptoApiRandomGenerator();
SecureRandom random = new SecureRandom(rg);
KeyGenerationParameters keyGenerationParameters = new KeyGenerationParameters(random, keyStrength);
var keyPairGenerator = new ECKeyPairGenerator();
keyPairGenerator.Init(keyGenerationParameters);
// Starting the loop we have a (not yet certified) DeviceID public key
// and the Issuer of the Alias Cert (which we want to be the DevID-cert DN.)
List <X509Certificate> certChain = new List <X509Certificate>();
var lastCertIssuer = aliasCert.IssuerDN;
var lastPubKey = bundle.DeviceIDPublic;;
AsymmetricCipherKeyPair lastKeyPair = null;
for (int j = 0; j < chainLen; j++)
{
bool rootCert = j == chainLen - 1;
bool lastButOne = j == chainLen - 2;
AsymmetricCipherKeyPair caKey = keyPairGenerator.GenerateKeyPair();
X509V3CertificateGenerator certGen = new X509V3CertificateGenerator();
certGen.SetSerialNumber(new BigInteger(new byte[] { 1, 2, 3, 4, 5 }));
var issuerDn = lastButOne ?
new X509Name($"CN=Vendor Root CA O=MSR_TEST, C=US") :
new X509Name($"CN=Vendor Intermediate CA {j}, O=MSR_TEST, C=US");
if (rootCert)
{
issuerDn = lastCertIssuer;
}
certGen.SetIssuerDN(issuerDn);
certGen.SetSubjectDN(lastCertIssuer);
certGen.SetNotBefore(now);
certGen.SetNotAfter(now + new TimeSpan(365 * 10, 0, 0, 0, 0));
certGen.SetPublicKey(lastPubKey);
int pathLengthConstraint = j + 1;
certGen.AddExtension(X509Extensions.BasicConstraints, true, new BasicConstraints(pathLengthConstraint));
certGen.AddExtension(X509Extensions.KeyUsage, true, new KeyUsage(KeyUsage.KeyCertSign));
X509Certificate certificate;
if (rootCert)
{
ISignatureFactory signatureFactory = new Asn1SignatureFactory("SHA256WITHECDSA", lastKeyPair.Private, random);
certificate = certGen.Generate(signatureFactory);
}
else
{
ISignatureFactory signatureFactory = new Asn1SignatureFactory("SHA256WITHECDSA", caKey.Private, random);
certificate = certGen.Generate(signatureFactory);
}
lastCertIssuer = certificate.IssuerDN;
lastPubKey = caKey.Public;
lastKeyPair = caKey;
certChain.Add(certificate);
}
// Chain including root, but not AliasCert. NOTE, finishes with CA
Helpers.WritePEMObjects(ToPath(Program.DeviceCertChain), certChain.ToArray());
// cert chain including AliasCert (alias cert is first. CA is last)
JoinFiles(Program.AliasCert, Program.DeviceCertChain, Program.DeviceCertChainIncAlias);
// just the device CA (for the server)
Helpers.WritePEMObject(ToPath("DeviceCA.pem"), certChain.Last());
// Now make some certs for the server to use
string serverCaName = "CN=Server CA, C=US, O=MSR_TEST";
string serverName = "CN=Server Cert, C=US, O=MSR_TEST";
var serverCA = MakeCertInternal(serverCaName, serverCaName, true, null, null, 1);
var serverCert = MakeCertInternal(serverCaName, serverName, false, serverCA.KeyPair, null, 0);
Helpers.WritePEMObject(ToPath(Program.ServerCA), serverCA.Certificate);
Helpers.WritePEMObjects(ToPath(Program.ServerChain), new Object[] { serverCA.Certificate, serverCert.Certificate });
//Helpers.WritePEMObject(ToPath("T0_ServerCAKey.PEM", serverCA.KeyPair);
Helpers.WritePEMObject(ToPath(Program.ServerCert), serverCert.Certificate);
Helpers.WritePEMObject(ToPath(Program.ServerKey), serverCert.KeyPair);
// OpenSSL needs a file with the Device CA AND the server CA
JoinFiles(Program.DeviceCertChain, Program.ServerCA, Program.DeviceCertChainAndServerCA);
// OpenSSL test scripts -
// print a cert
// openssl x509 -text -in T0_ServerCA.pem
// Just verify the client chain
// openssl verify -purpose sslclient -CAfile T0_DeviceCertChain.PEM DeviceAliasCert.PEM
// Just verify the server chain
// openssl verify -purpose sslserver -CAfile T0_ServerCA.PEM T0_ServerCert.PEM
// openssl s_client -connect localhost: 5556 - cert T0_AliasCert.PEM - key T0_AliasKey.PEM - CAfile T0_DeviceCertChainAndServerCA.PEM
// openssl s_client -connect localhost:5556 -cert T0_AliasCert.PEM -key T0_AliasKey.PEM -CAfile T0_DeviceCertChain.PEM
// openssl s_server -cert T0_ServerCert.PEM -key T0_ServerKey.PEM -CAfile T0_DeviceCertChainAndServerCA.PEM -status_verbose -verify 10 -rev -accept 5556
return;
}
/// <summary>
/// Make a new Alias Cert. If refresh=false, a new DevID and Alias are created. If refresh=true
/// then just the Alias is created and re-certified using the stored DevID key.
/// </summary>
/// <param name="refresh"></param>
/// <returns></returns>
internal DeviceBundle MakeAliasCert(bool refresh, int fwidSeed)
{
DateTime now = DateTime.Now;
byte[] fwid = Helpers.HashData(new byte[1] {
(byte)fwidSeed
}, 0, 1);
const int keyStrength = 256;
CryptoApiRandomGenerator rg = new CryptoApiRandomGenerator();
SecureRandom random = new SecureRandom(rg);
KeyGenerationParameters keyGenerationParameters = new KeyGenerationParameters(random, keyStrength);
var keyPairGenerator = new ECKeyPairGenerator();
keyPairGenerator.Init(keyGenerationParameters);
AsymmetricCipherKeyPair devIdKey = null;
if (refresh)
{
devIdKey = (AsymmetricCipherKeyPair)Helpers.ReadPemObject(ToPath(Program.DeviceIDPrivate));
}
else
{
devIdKey = keyPairGenerator.GenerateKeyPair();
}
// test - remove
var oids = new List <Object>()
{
X509Name.UnstructuredName
};
var values = new List <Object>()
{
"ljkljljklkjlkjlkjlkjlkjlkjlkjlkjlkjljklkjlkjlkjlkjljk"
};
X509Name name = new X509Name(oids, values);
AsymmetricCipherKeyPair aliasKey = keyPairGenerator.GenerateKeyPair();
// make a string name based on DevID public. Note that the authoritative information
// is encoded in the RIoT-extension: this is just for quick-and-dirty device identification.
var pubInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(devIdKey.Public);
byte[] pubEncoded = pubInfo.GetDerEncoded();
var pubHashed = Helpers.HashData(pubEncoded, 0, pubEncoded.Length);
var shortNameBytes = Helpers.CopyArray(pubHashed, 0, 8);
var shortNameString = Helpers.Hexify(shortNameBytes);
X509V3CertificateGenerator certGen = new X509V3CertificateGenerator();
var serialNumber = new byte[8];
rg.NextBytes(serialNumber);
serialNumber[0] &= 0x7F;
certGen.SetSerialNumber(new BigInteger(serialNumber));
// The important name-related stuff is encoded in the RIoT extension
certGen.SetIssuerDN(new X509Name($"CN=[I]DevID:{shortNameString}, O=MSR_TEST, C=US"));
// test REMOVE
//certGen.SetSubjectDN(name);
certGen.SetSubjectDN(new X509Name($"CN=[S]DevID:{shortNameString}, O=MSR_TEST, C=US"));
certGen.SetNotBefore(now);
certGen.SetNotAfter(now + new TimeSpan(365 * 10, 0, 0, 0, 0));
certGen.SetPublicKey(aliasKey.Public);
// Add the extensions (todo: not sure about KeyUsage.DigitalSiganture
certGen.AddExtension(X509Extensions.ExtendedKeyUsage, true,
ExtendedKeyUsage.GetInstance(new DerSequence(KeyPurposeID.IdKPClientAuth)));
certGen.AddExtension(X509Extensions.KeyUsage, true, new KeyUsage(KeyUsage.DigitalSignature));
AddRIoTExtension(certGen, fwid, devIdKey);
// sign it
ISignatureFactory signatureFactory = new Asn1SignatureFactory("SHA256WITHECDSA", devIdKey.Private, random);
var certificate = certGen.Generate(signatureFactory);
// and return the bundle
DeviceBundle bundle = new DeviceBundle
{
AliasCert = certificate,
DeviceIDPublic = devIdKey.Public,
AliasKeyPair = aliasKey
};
// Just the AliasCert
Helpers.WritePEMObject(ToPath(Program.AliasCert), bundle.AliasCert);
// The Alias Key Pair
Helpers.WritePEMObject(ToPath(Program.AliasKey), bundle.AliasKeyPair);
// The encoded DevID
Helpers.WritePEMObject(ToPath(Program.DeviceIDPublic), bundle.DeviceIDPublic);
// DeviceIDPrivate (just for the update demo)
Helpers.WritePEMObject(ToPath(Program.DeviceIDPrivate), devIdKey.Private);
return(bundle);
}
