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Tpm.cs
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using System;
using System.Buffers.Binary;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using fido2_net_lib.Test;
using Fido2NetLib;
using Fido2NetLib.Cbor;
using Fido2NetLib.Objects;
using Xunit;
namespace Test.Attestation
{
public class Tpm : Fido2Tests.Attestation
{
private readonly X500DistinguishedName attDN = new X500DistinguishedName("");
private X509Certificate2 attestnCert;
private DateTimeOffset notBefore, notAfter;
private readonly X509EnhancedKeyUsageExtension tcgKpAIKCertExt;
private X509Extension aikCertSanExt;
private byte[] unique, exponent, curveId, kdf;
private byte[] tpmAlg;
private static readonly Dictionary<TpmAlg, ushort> TpmAlgToDigestSizeMap = new ()
{
{ TpmAlg.TPM_ALG_SHA1, (160/8) },
{ TpmAlg.TPM_ALG_SHA256, (256/8) },
{ TpmAlg.TPM_ALG_SHA384, (384/8) },
{ TpmAlg.TPM_ALG_SHA512, (512/8) }
};
private static readonly Dictionary<int, TpmEccCurve> CoseCurveToTpm = new ()
{
{ 1, TpmEccCurve.TPM_ECC_NIST_P256},
{ 2, TpmEccCurve.TPM_ECC_NIST_P384},
{ 3, TpmEccCurve.TPM_ECC_NIST_P521},
};
public Tpm()
{
_attestationObject = new CborMap { { "fmt", "tpm" } };
unique = null;
exponent = null;
curveId = null;
kdf = null;
var type = new byte[2];
tpmAlg = new byte[2];
notBefore = DateTimeOffset.UtcNow;
notAfter = notBefore.AddDays(2);
caExt = new X509BasicConstraintsExtension(true, true, 2, false);
notCAExt = new X509BasicConstraintsExtension(false, false, 0, false);
tcgKpAIKCertExt = new X509EnhancedKeyUsageExtension(
new OidCollection
{
new Oid("2.23.133.8.3")
},
false);
byte[] asnEncodedSAN = TpmSanEncoder.Encode(
manufacturer : "id:FFFFF1D0",
model : "FIDO2-NET-LIB-TEST-TPM",
version : "id:F1D00002"
);
aikCertSanExt = new X509Extension("2.5.29.17", asnEncodedSAN, false);
}
[Fact]
public void TestTPM()
{
Fido2Tests._validCOSEParameters.ForEach(async ((COSE.KeyType, COSE.Algorithm, COSE.EllipticCurve) param) =>
{
var (type, alg, curve) = param;
if (type is COSE.KeyType.OKP)
{
return; // no OKP support in TPM
}
if (type is COSE.KeyType.EC2 && alg is COSE.Algorithm.ES256K)
{
return; // no secp256k1 support in TPM
}
tpmAlg = GetTmpAlg(alg).ToUInt16BigEndianBytes();
switch (type)
{
case COSE.KeyType.EC2:
using (var ecdsaRoot = ECDsa.Create())
{
var rootRequest = new CertificateRequest(rootDN, ecdsaRoot, HashAlgorithmName.SHA256);
rootRequest.CertificateExtensions.Add(caExt);
ECCurve eCCurve = ECCurve.NamedCurves.nistP256;
switch (curve)
{
case COSE.EllipticCurve.P384:
eCCurve = ECCurve.NamedCurves.nistP384;
break;
case COSE.EllipticCurve.P521:
eCCurve = ECCurve.NamedCurves.nistP521;
break;
}
using (var rootCert = rootRequest.CreateSelfSigned(notBefore, notAfter))
using (var ecdsaAtt = ECDsa.Create(eCCurve))
{
var attRequest = new CertificateRequest(attDN, ecdsaAtt, HashAlgorithmName.SHA256);
attRequest.CertificateExtensions.Add(notCAExt);
attRequest.CertificateExtensions.Add(idFidoGenCeAaguidExt);
attRequest.CertificateExtensions.Add(aikCertSanExt);
attRequest.CertificateExtensions.Add(tcgKpAIKCertExt);
var serial = new byte[12];
RandomNumberGenerator.Fill(serial);
using (X509Certificate2 publicOnly = attRequest.Create(
rootCert,
notBefore,
notAfter,
serial))
{
attestnCert = publicOnly.CopyWithPrivateKey(ecdsaAtt);
}
var X5c = new CborArray {
attestnCert.RawData,
rootCert.RawData
};
var ecparams = ecdsaAtt.ExportParameters(true);
var cpk = new CborMap {
{ COSE.KeyCommonParameter.KeyType, type },
{ COSE.KeyCommonParameter.Alg, alg},
{ COSE.KeyTypeParameter.X, ecparams.Q.X},
{ COSE.KeyTypeParameter.Y, ecparams.Q.Y},
{ COSE.KeyTypeParameter.Crv, curve},
};
var x = (byte[])cpk[COSE.KeyTypeParameter.X];
var y = (byte[])cpk[COSE.KeyTypeParameter.Y];
_credentialPublicKey = new CredentialPublicKey(cpk);
unique = GetUInt16BigEndianBytes(x.Length)
.Concat(x)
.Concat(GetUInt16BigEndianBytes(y.Length))
.Concat(y)
.ToArray();
curveId = BitConverter.GetBytes((ushort)CoseCurveToTpm[(int)cpk[COSE.KeyTypeParameter.Crv]]).Reverse().ToArray();
kdf = BitConverter.GetBytes((ushort)TpmAlg.TPM_ALG_NULL); // should this be big endian?
var pubArea = CreatePubArea(
TpmAlg.TPM_ALG_ECC, // Type
tpmAlg, // Alg
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // Attributes
new byte[] { 0x00 }, // Policy
new byte[] { 0x00, 0x10 }, // Symmetric
new byte[] { 0x00, 0x10 }, // Scheme
new byte[] { 0x80, 0x00 }, // KeyBits
exponent, // Exponent
curveId, // CurveID
kdf, // KDF
unique // Unique
);
var hashAlg = CryptoUtils.HashAlgFromCOSEAlg(alg);
byte[] hashedData = _attToBeSignedHash(hashAlg);
byte[] hashedPubArea = CryptoUtils.HashData(hashAlg, pubArea);
byte[] extraData = Concat(GetUInt16BigEndianBytes(hashedData.Length), hashedData);
var tpm2bNameLen = GetUInt16BigEndianBytes(tpmAlg.Length + hashedPubArea.Length);
byte[] tpm2bName = DataHelper.Concat(tpm2bNameLen, tpmAlg, hashedPubArea);
var certInfo = CreateCertInfo(
new byte[] { 0x47, 0x43, 0x54, 0xff }.Reverse().ToArray(), // Magic
new byte[] { 0x17, 0x80 }.Reverse().ToArray(), // Type
new byte[] { 0x00, 0x01, 0x00 }, // QualifiedSIgner
extraData, // ExtraData
new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // Clock
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // ResetCount
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // RestartCount
new byte[] { 0x00 }, // Safe
new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // FirmwareVersion
tpm2bName, // TPM2BName
new byte[] { 0x00, 0x00 } // AttestedQualifiedNameBuffer
);
byte[] signature = Fido2Tests.SignData(type, alg, certInfo, ecdsaAtt, null, null);
_attestationObject.Add("attStmt", new CborMap {
{ "ver", "2.0" },
{ "alg", alg },
{ "x5c", X5c },
{ "sig", signature },
{ "certInfo", certInfo },
{ "pubArea", pubArea }
});
}
}
break;
case COSE.KeyType.RSA:
using (RSA rsaRoot = RSA.Create())
{
RSASignaturePadding padding = GetRSASignaturePaddingForCoseAlgorithm(alg);
var rootRequest = new CertificateRequest(rootDN, rsaRoot, HashAlgorithmName.SHA256, padding);
rootRequest.CertificateExtensions.Add(caExt);
using (var rootCert = rootRequest.CreateSelfSigned(notBefore, notAfter))
using (var rsaAtt = RSA.Create())
{
var attRequest = new CertificateRequest(attDN, rsaAtt, HashAlgorithmName.SHA256, padding);
attRequest.CertificateExtensions.Add(notCAExt);
attRequest.CertificateExtensions.Add(idFidoGenCeAaguidExt);
attRequest.CertificateExtensions.Add(aikCertSanExt);
attRequest.CertificateExtensions.Add(tcgKpAIKCertExt);
var serial = new byte[12];
RandomNumberGenerator.Fill(serial);
using (X509Certificate2 publicOnly = attRequest.Create(
rootCert,
notBefore,
notAfter,
serial))
{
attestnCert = publicOnly.CopyWithPrivateKey(rsaAtt);
}
var X5c = new CborArray {
attestnCert.RawData,
rootCert.RawData
};
var rsaparams = rsaAtt.ExportParameters(true);
_credentialPublicKey = GetRSACredentialPublicKey(type, alg, rsaparams);
unique = rsaparams.Modulus;
exponent = rsaparams.Exponent;
var pubArea = CreatePubArea(
TpmAlg.TPM_ALG_RSA, // Type
tpmAlg, // Alg
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // Attributes
new byte[] { 0x00 }, // Policy
new byte[] { 0x00, 0x10 }, // Symmetric
new byte[] { 0x00, 0x10 }, // Scheme
new byte[] { 0x80, 0x00 }, // KeyBits
exponent, // Exponent
curveId, // CurveID
kdf, // KDF
unique // Unique
);
byte[] data = Concat(_authData, _clientDataHash);
var hashAlg = CryptoUtils.HashAlgFromCOSEAlg(alg);
byte[] hashedData = CryptoUtils.HashData(hashAlg, data);
byte[] hashedPubArea = CryptoUtils.HashData(hashAlg, pubArea);
byte[] extraData = Concat(GetUInt16BigEndianBytes(hashedData.Length), hashedData);
byte[] tpm2bNameLen = GetUInt16BigEndianBytes(tpmAlg.Length + hashedPubArea.Length);
byte[] tpm2bName = DataHelper.Concat(tpm2bNameLen, tpmAlg, hashedPubArea);
var certInfo = CreateCertInfo(
new byte[] { 0x47, 0x43, 0x54, 0xff }.Reverse().ToArray(), // Magic
new byte[] { 0x17, 0x80 }.Reverse().ToArray(), // Type
new byte[] { 0x00, 0x01, 0x00 }, // QualifiedSIgner
extraData, // ExtraData
new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // Clock
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // ResetCount
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // RestartCount
new byte[] { 0x00 }, // Safe
new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // FirmwareVersion
tpm2bName, // TPM2BName
new byte[] { 0x00, 0x00 } // AttestedQualifiedNameBuffer
);
byte[] signature = Fido2Tests.SignData(type, alg, certInfo, null, rsaAtt, null);
_attestationObject.Set("attStmt", new CborMap {
{ "ver", "2.0" },
{ "alg", alg },
{ "x5c", X5c },
{ "sig", signature },
{ "certInfo", certInfo },
{ "pubArea", pubArea }
});
}
}
break;
}
var res = await MakeAttestationResponse();
Assert.Equal(string.Empty, res.ErrorMessage);
Assert.Equal("ok", res.Status);
Assert.Equal(_aaguid, res.Result.Aaguid);
Assert.Equal(_signCount, res.Result.Counter);
Assert.Equal("tpm", res.Result.CredType);
Assert.Equal(_credentialID, res.Result.CredentialId);
Assert.Null(res.Result.ErrorMessage);
Assert.Equal(_credentialPublicKey.GetBytes(), res.Result.PublicKey);
Assert.Null(res.Result.Status);
Assert.Equal("Test User", res.Result.User.DisplayName);
Assert.Equal(System.Text.Encoding.UTF8.GetBytes("testuser"), res.Result.User.Id);
Assert.Equal("testuser", res.Result.User.Name);
_attestationObject = new CborMap { { "fmt", "tpm" } };
});
}
[Fact]
public void TestTPMAikCertSANTCGConformant()
{
var (type, alg, _) = Fido2Tests._validCOSEParameters[3];
tpmAlg = GetTmpAlg(alg).ToUInt16BigEndianBytes();
using (RSA rsaRoot = RSA.Create())
{
RSASignaturePadding padding = GetRSASignaturePaddingForCoseAlgorithm(alg);
var rootRequest = new CertificateRequest(rootDN, rsaRoot, HashAlgorithmName.SHA256, padding);
rootRequest.CertificateExtensions.Add(caExt);
using (var rootCert = rootRequest.CreateSelfSigned(notBefore, notAfter))
using (var rsaAtt = RSA.Create())
{
var attRequest = new CertificateRequest(attDN, rsaAtt, HashAlgorithmName.SHA256, padding);
attRequest.CertificateExtensions.Add(notCAExt);
attRequest.CertificateExtensions.Add(idFidoGenCeAaguidExt);
byte[] asnEncodedSAN = TpmSanEncoder.Encode(
manufacturer : "id:FFFFF1D0",
model : "FIDO2-NET-LIB-TestTPMAikCertSANTCGConformant",
version : "id:F1D00002"
);
var aikCertSanExt = new X509Extension(
"2.5.29.17",
asnEncodedSAN,
false);
attRequest.CertificateExtensions.Add(aikCertSanExt);
attRequest.CertificateExtensions.Add(tcgKpAIKCertExt);
var serial = new byte[12];
RandomNumberGenerator.Fill(serial);
using (X509Certificate2 publicOnly = attRequest.Create(
rootCert,
notBefore,
notAfter,
serial))
{
attestnCert = publicOnly.CopyWithPrivateKey(rsaAtt);
}
var X5c = new CborArray {
attestnCert.RawData,
rootCert.RawData
};
var rsaparams = rsaAtt.ExportParameters(true);
_credentialPublicKey = GetRSACredentialPublicKey(type, alg, rsaparams);
unique = rsaparams.Modulus;
exponent = rsaparams.Exponent;
var pubArea = CreatePubArea(
TpmAlg.TPM_ALG_RSA, // Type
tpmAlg, // Alg
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // Attributes
new byte[] { 0x00 }, // Policy
new byte[] { 0x00, 0x10 }, // Symmetric
new byte[] { 0x00, 0x10 }, // Scheme
new byte[] { 0x80, 0x00 }, // KeyBits
exponent, // Exponent
curveId, // CurveID
kdf, // KDF
unique // Unique
);
byte[] data = Concat(_authData, _clientDataHash);
var hashAlg = CryptoUtils.HashAlgFromCOSEAlg(alg);
byte[] hashedData = CryptoUtils.HashData(hashAlg, data);
byte[] hashedPubArea = CryptoUtils.HashData(hashAlg, pubArea);
byte[] extraData = Concat(GetUInt16BigEndianBytes(hashedData.Length), hashedData);
byte[] tpm1bNameLen = GetUInt16BigEndianBytes(tpmAlg.Length + hashedPubArea.Length);
byte[] tpm1bName = DataHelper.Concat(tpm1bNameLen, tpmAlg, hashedPubArea);
var certInfo = CreateCertInfo(
new byte[] { 0x47, 0x43, 0x54, 0xff }.Reverse().ToArray(), // Magic
new byte[] { 0x17, 0x80 }.Reverse().ToArray(), // Type
new byte[] { 0x00, 0x01, 0x00 }, // QualifiedSIgner
extraData, // ExtraData
new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // Clock
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // ResetCount
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // RestartCount
new byte[] { 0x00 }, // Safe
new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // FirmwareVersion
tpm1bName, // TPM2BName
new byte[] { 0x00, 0x00 } // AttestedQualifiedNameBuffer
);
byte[] signature = Fido2Tests.SignData(type, alg, certInfo, null, rsaAtt, null);
_attestationObject.Add("attStmt", new CborMap {
{ "ver", "2.0" },
{ "alg", alg },
{ "x5c", X5c },
{ "sig", signature },
{ "certInfo", certInfo },
{ "pubArea", pubArea }
});
var res = MakeAttestationResponse().Result;
Assert.Equal(string.Empty, res.ErrorMessage);
Assert.Equal("ok", res.Status);
Assert.Equal(_aaguid, res.Result.Aaguid);
Assert.Equal(_signCount, res.Result.Counter);
Assert.Equal("tpm", res.Result.CredType);
Assert.Equal(_credentialID, res.Result.CredentialId);
Assert.Null(res.Result.ErrorMessage);
Assert.Equal(_credentialPublicKey.GetBytes(), res.Result.PublicKey);
Assert.Null(res.Result.Status);
Assert.Equal("Test User", res.Result.User.DisplayName);
Assert.Equal(System.Text.Encoding.UTF8.GetBytes("testuser"), res.Result.User.Id);
Assert.Equal("testuser", res.Result.User.Name);
}
}
}
[Fact]
public void TestTPMSigNull()
{
var (type, alg, _) = Fido2Tests._validCOSEParameters[3];
tpmAlg = GetTmpAlg(alg).ToUInt16BigEndianBytes();
using (RSA rsaRoot = RSA.Create())
{
RSASignaturePadding padding = GetRSASignaturePaddingForCoseAlgorithm(alg);
var rootRequest = new CertificateRequest(rootDN, rsaRoot, HashAlgorithmName.SHA256, padding);
rootRequest.CertificateExtensions.Add(caExt);
using (var rootCert = rootRequest.CreateSelfSigned(notBefore, notAfter))
using (var rsaAtt = RSA.Create())
{
var attRequest = new CertificateRequest(attDN, rsaAtt, HashAlgorithmName.SHA256, padding);
attRequest.CertificateExtensions.Add(notCAExt);
attRequest.CertificateExtensions.Add(idFidoGenCeAaguidExt);
attRequest.CertificateExtensions.Add(aikCertSanExt);
attRequest.CertificateExtensions.Add(tcgKpAIKCertExt);
var serial = new byte[12];
RandomNumberGenerator.Fill(serial);
using (X509Certificate2 publicOnly = attRequest.Create(
rootCert,
notBefore,
notAfter,
serial))
{
attestnCert = publicOnly.CopyWithPrivateKey(rsaAtt);
}
var X5c = new CborArray {
attestnCert.RawData,
rootCert.RawData
};
var rsaparams = rsaAtt.ExportParameters(true);
_credentialPublicKey = GetRSACredentialPublicKey(type, alg, rsaparams);
unique = rsaparams.Modulus;
exponent = rsaparams.Exponent;
var pubArea = CreatePubArea(
TpmAlg.TPM_ALG_RSA, // Type
tpmAlg, // Alg
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // Attributes
new byte[] { 0x00 }, // Policy
new byte[] { 0x00, 0x10 }, // Symmetric
new byte[] { 0x00, 0x10 }, // Scheme
new byte[] { 0x80, 0x00 }, // KeyBits
exponent, // Exponent
curveId, // CurveID
kdf, // KDF
unique // Unique
);
byte[] data = Concat(_authData, _clientDataHash);
var hashAlg = CryptoUtils.HashAlgFromCOSEAlg(alg);
byte[] hashedData = CryptoUtils.HashData(hashAlg, data);
byte[] hashedPubArea = CryptoUtils.HashData(hashAlg, pubArea);
byte[] extraData = Concat(GetUInt16BigEndianBytes(hashedData.Length), hashedData);
byte[] tpm2bNameLen = GetUInt16BigEndianBytes(tpmAlg.Length + hashedPubArea.Length);
byte[] tpm2bName = DataHelper.Concat(tpm2bNameLen, tpmAlg, hashedPubArea);
var certInfo = CreateCertInfo(
new byte[] { 0x47, 0x43, 0x54, 0xff }.Reverse().ToArray(), // Magic
new byte[] { 0x17, 0x80 }.Reverse().ToArray(), // Type
new byte[] { 0x00, 0x01, 0x00 }, // QualifiedSIgner
extraData, // ExtraData
new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // Clock
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // ResetCount
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // RestartCount
new byte[] { 0x00 }, // Safe
new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // FirmwareVersion
tpm2bName, // TPM2BName
new byte[] { 0x00, 0x00 } // AttestedQualifiedNameBuffer
);
byte[] signature = Fido2Tests.SignData(type, alg, certInfo, null, rsaAtt, null);
_attestationObject.Add("attStmt", new CborMap {
{ "ver", "2.0" },
{ "alg", alg },
{ "x5c", X5c },
{ "sig", CborNull.Instance },
{ "certInfo", certInfo },
{ "pubArea", pubArea },
});
var ex = Assert.ThrowsAsync<Fido2VerificationException>(() => MakeAttestationResponse());
Assert.Equal("Invalid TPM attestation signature", ex.Result.Message);
}
}
}
[Fact]
public void TestTPMSigNotByteString()
{
var (type, alg, _) = Fido2Tests._validCOSEParameters[3];
tpmAlg = GetTmpAlg(alg).ToUInt16BigEndianBytes();
using (RSA rsaRoot = RSA.Create())
{
RSASignaturePadding padding = GetRSASignaturePaddingForCoseAlgorithm(alg);
var rootRequest = new CertificateRequest(rootDN, rsaRoot, HashAlgorithmName.SHA256, padding);
rootRequest.CertificateExtensions.Add(caExt);
using (var rootCert = rootRequest.CreateSelfSigned(notBefore, notAfter))
using (var rsaAtt = RSA.Create())
{
var attRequest = new CertificateRequest(attDN, rsaAtt, HashAlgorithmName.SHA256, padding);
attRequest.CertificateExtensions.Add(notCAExt);
attRequest.CertificateExtensions.Add(idFidoGenCeAaguidExt);
attRequest.CertificateExtensions.Add(aikCertSanExt);
attRequest.CertificateExtensions.Add(tcgKpAIKCertExt);
var serial = new byte[12];
RandomNumberGenerator.Fill(serial);
using (X509Certificate2 publicOnly = attRequest.Create(
rootCert,
notBefore,
notAfter,
serial))
{
attestnCert = publicOnly.CopyWithPrivateKey(rsaAtt);
}
var X5c = new CborArray {
attestnCert.RawData,
rootCert.RawData
};
var rsaparams = rsaAtt.ExportParameters(true);
_credentialPublicKey = GetRSACredentialPublicKey(type, alg, rsaparams);
unique = rsaparams.Modulus;
exponent = rsaparams.Exponent;
var pubArea = CreatePubArea(
TpmAlg.TPM_ALG_RSA, // Type
tpmAlg, // Alg
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // Attributes
new byte[] { 0x00 }, // Policy
new byte[] { 0x00, 0x10 }, // Symmetric
new byte[] { 0x00, 0x10 }, // Scheme
new byte[] { 0x80, 0x00 }, // KeyBits
exponent, // Exponent
curveId, // CurveID
kdf, // KDF
unique // Unique
);
byte[] data = Concat(_authData, _clientDataHash);
var hashAlg = CryptoUtils.HashAlgFromCOSEAlg(alg);
byte[] hashedData = CryptoUtils.HashData(hashAlg, data);
byte[] hashedPubArea = CryptoUtils.HashData(hashAlg, pubArea);
byte[] extraData = Concat(GetUInt16BigEndianBytes(hashedData.Length), hashedData);
byte[] tpm2bNameLen = GetUInt16BigEndianBytes(tpmAlg.Length + hashedPubArea.Length);
byte[] tpm2bName = DataHelper.Concat(tpm2bNameLen, tpmAlg, hashedPubArea);
var certInfo = CreateCertInfo(
new byte[] { 0x47, 0x43, 0x54, 0xff }.Reverse().ToArray(), // Magic
new byte[] { 0x17, 0x80 }.Reverse().ToArray(), // Type
new byte[] { 0x00, 0x01, 0x00 }, // QualifiedSIgner
extraData, // ExtraData
new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // Clock
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // ResetCount
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // RestartCount
new byte[] { 0x00 }, // Safe
new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // FirmwareVersion
tpm2bName, // TPM2BName
new byte[] { 0x00, 0x00 } // AttestedQualifiedNameBuffer
);
byte[] signature = Fido2Tests.SignData(type, alg, certInfo, null, rsaAtt, null);
_attestationObject.Add("attStmt", new CborMap {
{ "ver", "2.0" },
{ "alg", (int)alg },
{ "x5c", X5c },
{ "sig", "strawberries" },
{ "certInfo", certInfo },
{ "pubArea", pubArea }
});
var ex = Assert.ThrowsAsync<Fido2VerificationException>(() => MakeAttestationResponse());
Assert.Equal("Invalid TPM attestation signature", ex.Result.Message);
}
}
}
[Fact]
public void TestTPMSigByteStringZeroLen()
{
var (type, alg, _) = Fido2Tests._validCOSEParameters[3];
tpmAlg = GetTmpAlg(alg).ToUInt16BigEndianBytes();
using (RSA rsaRoot = RSA.Create())
{
RSASignaturePadding padding = GetRSASignaturePaddingForCoseAlgorithm(alg);
var rootRequest = new CertificateRequest(rootDN, rsaRoot, HashAlgorithmName.SHA256, padding);
rootRequest.CertificateExtensions.Add(caExt);
using (var rootCert = rootRequest.CreateSelfSigned(notBefore, notAfter))
using (var rsaAtt = RSA.Create())
{
var attRequest = new CertificateRequest(attDN, rsaAtt, HashAlgorithmName.SHA256, padding);
attRequest.CertificateExtensions.Add(notCAExt);
attRequest.CertificateExtensions.Add(idFidoGenCeAaguidExt);
attRequest.CertificateExtensions.Add(aikCertSanExt);
attRequest.CertificateExtensions.Add(tcgKpAIKCertExt);
var serial = new byte[12];
RandomNumberGenerator.Fill(serial);
using (X509Certificate2 publicOnly = attRequest.Create(
rootCert,
notBefore,
notAfter,
serial))
{
attestnCert = publicOnly.CopyWithPrivateKey(rsaAtt);
}
var X5c = new CborArray {
attestnCert.RawData,
rootCert.RawData
};
var rsaparams = rsaAtt.ExportParameters(true);
_credentialPublicKey = GetRSACredentialPublicKey(type, alg, rsaparams);
unique = rsaparams.Modulus;
exponent = rsaparams.Exponent;
var pubArea = CreatePubArea(
TpmAlg.TPM_ALG_RSA, // Type
tpmAlg, // Alg
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // Attributes
new byte[] { 0x00 }, // Policy
new byte[] { 0x00, 0x10 }, // Symmetric
new byte[] { 0x00, 0x10 }, // Scheme
new byte[] { 0x80, 0x00 }, // KeyBits
exponent, // Exponent
curveId, // CurveID
kdf, // KDF
unique // Unique
);
byte[] data = Concat(_authData, _clientDataHash);
var hashAlg = CryptoUtils.HashAlgFromCOSEAlg(alg);
byte[] hashedData = CryptoUtils.HashData(hashAlg, data);
byte[] hashedPubArea = CryptoUtils.HashData(hashAlg, pubArea);
byte[] extraData = Concat(GetUInt16BigEndianBytes(hashedData.Length), hashedData);
byte[] tpm2bNameLen = GetUInt16BigEndianBytes(tpmAlg.Length + hashedPubArea.Length);
byte[] tpm2bName = DataHelper.Concat(tpm2bNameLen, tpmAlg, hashedPubArea);
var certInfo = CreateCertInfo(
new byte[] { 0x47, 0x43, 0x54, 0xff }.Reverse().ToArray(), // Magic
new byte[] { 0x17, 0x80 }.Reverse().ToArray(), // Type
new byte[] { 0x00, 0x01, 0x00 }, // QualifiedSIgner
extraData, // ExtraData
new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // Clock
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // ResetCount
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // RestartCount
new byte[] { 0x00 }, // Safe
new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // FirmwareVersion
tpm2bName, // TPM2BName
new byte[] { 0x00, 0x00 } // AttestedQualifiedNameBuffer
);
byte[] signature = Fido2Tests.SignData(type, alg, certInfo, null, rsaAtt, null);
_attestationObject.Add("attStmt", new CborMap {
{ "ver", "2.0" },
{ "alg", (int)alg },
{ "x5c", X5c },
{ "sig", new byte[0] },
{ "certInfo", certInfo },
{ "pubArea", pubArea }
});
var ex = Assert.ThrowsAsync<Fido2VerificationException>(() => MakeAttestationResponse());
Assert.Equal("Invalid TPM attestation signature", ex.Result.Message);
}
}
}
[Fact]
public void TestTPMVersionNot2()
{
var (type, alg, _) = Fido2Tests._validCOSEParameters[3];
if (alg is COSE.Algorithm.ES256 or COSE.Algorithm.PS256 or COSE.Algorithm.RS256)
tpmAlg = TpmAlg.TPM_ALG_SHA256.ToUInt16BigEndianBytes();
if (alg is COSE.Algorithm.ES384 or COSE.Algorithm.PS384 or COSE.Algorithm.RS384)
tpmAlg = TpmAlg.TPM_ALG_SHA384.ToUInt16BigEndianBytes();
if (alg is COSE.Algorithm.ES512 or COSE.Algorithm.PS512 or COSE.Algorithm.RS512)
tpmAlg = TpmAlg.TPM_ALG_SHA512.ToUInt16BigEndianBytes();
if (alg is COSE.Algorithm.RS1)
tpmAlg = TpmAlg.TPM_ALG_SHA1.ToUInt16BigEndianBytes();
using (RSA rsaRoot = RSA.Create())
{
RSASignaturePadding padding = GetRSASignaturePaddingForCoseAlgorithm(alg);
var rootRequest = new CertificateRequest(rootDN, rsaRoot, HashAlgorithmName.SHA256, padding);
rootRequest.CertificateExtensions.Add(caExt);
using (var rootCert = rootRequest.CreateSelfSigned(notBefore, notAfter))
using (var rsaAtt = RSA.Create())
{
var attRequest = new CertificateRequest(attDN, rsaAtt, HashAlgorithmName.SHA256, padding);
attRequest.CertificateExtensions.Add(notCAExt);
attRequest.CertificateExtensions.Add(idFidoGenCeAaguidExt);
attRequest.CertificateExtensions.Add(aikCertSanExt);
attRequest.CertificateExtensions.Add(tcgKpAIKCertExt);
var serial = new byte[12];
RandomNumberGenerator.Fill(serial);
using (X509Certificate2 publicOnly = attRequest.Create(
rootCert,
notBefore,
notAfter,
serial))
{
attestnCert = publicOnly.CopyWithPrivateKey(rsaAtt);
}
var X5c = new CborArray {
attestnCert.RawData,
rootCert.RawData
};
var rsaparams = rsaAtt.ExportParameters(true);
_credentialPublicKey = GetRSACredentialPublicKey(type, alg, rsaparams);
unique = rsaparams.Modulus;
exponent = rsaparams.Exponent;
var pubArea = CreatePubArea(
TpmAlg.TPM_ALG_RSA, // Type
tpmAlg, // Alg
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // Attributes
new byte[] { 0x00 }, // Policy
new byte[] { 0x00, 0x10 }, // Symmetric
new byte[] { 0x00, 0x10 }, // Scheme
new byte[] { 0x80, 0x00 }, // KeyBits
exponent, // Exponent
curveId, // CurveID
kdf, // KDF
unique // Unique
);
byte[] data = Concat(_authData, _clientDataHash);
var hashAlg = CryptoUtils.HashAlgFromCOSEAlg(alg);
byte[] hashedData = CryptoUtils.HashData(hashAlg, data);
byte[] hashedPubArea = CryptoUtils.HashData(hashAlg, pubArea);
byte[] extraData = Concat(GetUInt16BigEndianBytes(hashedData.Length), hashedData);
byte[] tpm2bNameLen = GetUInt16BigEndianBytes(tpmAlg.Length + hashedPubArea.Length);
byte[] tpm2bName = DataHelper.Concat(tpm2bNameLen, tpmAlg, hashedPubArea);
var certInfo = CreateCertInfo(
new byte[] { 0x47, 0x43, 0x54, 0xff }.Reverse().ToArray(), // Magic
new byte[] { 0x17, 0x80 }.Reverse().ToArray(), // Type
new byte[] { 0x00, 0x01, 0x00 }, // QualifiedSIgner
extraData, // ExtraData
new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // Clock
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // ResetCount
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // RestartCount
new byte[] { 0x00 }, // Safe
new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // FirmwareVersion
tpm2bName, // TPM2BName
new byte[] { 0x00, 0x00 } // AttestedQualifiedNameBuffer
);
byte[] signature = Fido2Tests.SignData(type, alg, certInfo, null, rsaAtt, null);
_attestationObject.Add("attStmt", new CborMap {
{ "ver", "3.0" },
{ "alg", (int)alg },
{ "x5c", X5c },
{ "sig", signature },
{ "certInfo", certInfo },
{ "pubArea", pubArea }
});
var ex = Assert.ThrowsAsync<Fido2VerificationException>(() => MakeAttestationResponse());
Assert.Equal("FIDO2 only supports TPM 2.0", ex.Result.Message);
}
}
}
[Fact]
public void TestTPMPubAreaNull()
{
var (type, alg, _) = Fido2Tests._validCOSEParameters[3];
tpmAlg = GetTmpAlg(alg).ToUInt16BigEndianBytes();
using (RSA rsaRoot = RSA.Create())
{
RSASignaturePadding padding = GetRSASignaturePaddingForCoseAlgorithm(alg);
var rootRequest = new CertificateRequest(rootDN, rsaRoot, HashAlgorithmName.SHA256, padding);
rootRequest.CertificateExtensions.Add(caExt);
using (var rootCert = rootRequest.CreateSelfSigned(notBefore, notAfter))
using (var rsaAtt = RSA.Create())
{
var attRequest = new CertificateRequest(attDN, rsaAtt, HashAlgorithmName.SHA256, padding);
attRequest.CertificateExtensions.Add(notCAExt);
attRequest.CertificateExtensions.Add(idFidoGenCeAaguidExt);
attRequest.CertificateExtensions.Add(aikCertSanExt);
attRequest.CertificateExtensions.Add(tcgKpAIKCertExt);
var serial = new byte[12];
RandomNumberGenerator.Fill(serial);
using (X509Certificate2 publicOnly = attRequest.Create(
rootCert,
notBefore,
notAfter,
serial))
{
attestnCert = publicOnly.CopyWithPrivateKey(rsaAtt);
}
var X5c = new CborArray {
attestnCert.RawData,
rootCert.RawData
};
var rsaparams = rsaAtt.ExportParameters(true);
_credentialPublicKey = GetRSACredentialPublicKey(type, alg, rsaparams);
unique = rsaparams.Modulus;
exponent = rsaparams.Exponent;
var pubArea = CreatePubArea(
TpmAlg.TPM_ALG_RSA, // Type
tpmAlg, // Alg
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // Attributes
new byte[] { 0x00 }, // Policy
new byte[] { 0x00, 0x10 }, // Symmetric
new byte[] { 0x00, 0x10 }, // Scheme
new byte[] { 0x80, 0x00 }, // KeyBits
exponent, // Exponent
curveId, // CurveID
kdf, // KDF
unique // Unique
);
byte[] data = Concat(_authData, _clientDataHash);
var hashAlg = CryptoUtils.HashAlgFromCOSEAlg(alg);
byte[] hashedData = CryptoUtils.HashData(hashAlg, data);
byte[] hashedPubArea = CryptoUtils.HashData(hashAlg, pubArea);
byte[] extraData = Concat(GetUInt16BigEndianBytes(hashedData.Length), hashedData);
byte[] tpm2bNameLen = GetUInt16BigEndianBytes(tpmAlg.Length + hashedPubArea.Length);
byte[] tpm2bName = DataHelper.Concat(tpm2bNameLen, tpmAlg, hashedPubArea);
var certInfo = CreateCertInfo(
new byte[] { 0x47, 0x43, 0x54, 0xff }.Reverse().ToArray(), // Magic
new byte[] { 0x17, 0x80 }.Reverse().ToArray(), // Type
new byte[] { 0x00, 0x01, 0x00 }, // QualifiedSIgner
extraData, // ExtraData
new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // Clock
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // ResetCount
new byte[] { 0x00, 0x00, 0x00, 0x00 }, // RestartCount
new byte[] { 0x00 }, // Safe
new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // FirmwareVersion
tpm2bName, // TPM2BName
new byte[] { 0x00, 0x00 } // AttestedQualifiedNameBuffer
);
byte[] signature = Fido2Tests.SignData(type, alg, certInfo, null, rsaAtt, null);
_attestationObject.Add("attStmt", new CborMap {
{ "ver", "2.0" },
{ "alg", (int)alg },
{ "x5c", X5c },
{ "sig", signature },
{ "certInfo", certInfo},
{ "pubArea", CborNull.Instance },
});
var ex = Assert.ThrowsAsync<Fido2VerificationException>(() => MakeAttestationResponse());
Assert.Equal("Missing or malformed pubArea", ex.Result.Message);
}
}
}
[Fact]
public void TestTPMPubAreaNotByteString()
{
var (type, alg, curve) = Fido2Tests._validCOSEParameters[3];
tpmAlg = GetTmpAlg(alg).ToUInt16BigEndianBytes();
using (RSA rsaRoot = RSA.Create())
{
RSASignaturePadding padding = GetRSASignaturePaddingForCoseAlgorithm(alg);
var rootRequest = new CertificateRequest(rootDN, rsaRoot, HashAlgorithmName.SHA256, padding);
rootRequest.CertificateExtensions.Add(caExt);
using (var rootCert = rootRequest.CreateSelfSigned(notBefore, notAfter))
using (var rsaAtt = RSA.Create())
{
var attRequest = new CertificateRequest(attDN, rsaAtt, HashAlgorithmName.SHA256, padding);
attRequest.CertificateExtensions.Add(notCAExt);
attRequest.CertificateExtensions.Add(idFidoGenCeAaguidExt);
attRequest.CertificateExtensions.Add(aikCertSanExt);
attRequest.CertificateExtensions.Add(tcgKpAIKCertExt);