/// <summary>
/// Resets the policy for the specified <see cref="AttestationType"/> to the default value.
/// </summary>
/// <param name="attestationType"><see cref="AttestationType"/> whose policy should be reset.</param>
/// <param name="authorizationToken">Signed JSON Web Token signed by one of the policy management certificates used to verify the caller is authorized to reset policy to the default value..</param>
/// <param name="cancellationToken"></param>
/// <returns>An <see cref="AttestationResponse{PolicyCertificatesModificationResult}"/> with the policy for the specified attestation type.</returns>
public virtual async Task <AttestationResponse <PolicyResult> > ResetPolicyAsync(AttestationType attestationType, AttestationToken authorizationToken = default, CancellationToken cancellationToken = default)
{
using DiagnosticScope scope = _clientDiagnostics.CreateScope($"{nameof(AttestationAdministrationClient)}.{nameof(ResetPolicy)}");
scope.Start();
try
{
if (authorizationToken == null)
{
authorizationToken = new UnsecuredAttestationToken();
}
var result = await _policyClient.ResetAsync(attestationType, authorizationToken.ToString(), cancellationToken).ConfigureAwait(false);
var token = new AttestationToken(result.Value.Token);
if (_options.ValidateAttestationTokens)
{
token.ValidateToken(GetSigners(), _options.ValidationCallback);
}
return(new AttestationResponse <PolicyResult>(result.GetRawResponse(), token));
}
catch (Exception ex)
{
scope.Failed(ex);
throw;
}
}
/// <summary>
/// Sets the attesttion policy for the specified <see cref="AttestationType"/>.
/// </summary>
/// <param name="attestationType"><see cref="AttestationType"/> whose policy should be set.</param>
/// <param name="policyToSet">Specifies the attestation policy to set.</param>
/// <param name="signingKey">If provided, specifies the signing key used to sign the request to the attestation service.</param>
/// <param name="signingCertificate">If provided, specifies the X.509 certificate which will be used to validate the request with the attestation service.</param>
/// <param name="cancellationToken">Cancellation token used to cancel this operation.</param>
/// <returns>An <see cref="AttestationResponse{PolicyResult}"/> with the policy for the specified attestation type.</returns>
/// <remarks>
/// The <paramref name="signingKey"/> and <paramref name="signingCertificate"/> parameters are optional, but if one is provided the other must also be provided.
/// <para/>
/// If the <paramref name="signingKey"/> and <paramref name="signingCertificate"/> parameters are not provided, then the policy document sent to the
/// attestation service will be unsigned. Unsigned attestation policies are only allowed when the attestation instance is running in AAD mode - if the
/// attestation instance is running in Isolated mode, then a signing key and signing certificate MUST be provided to ensure that the caller of the API is authorized to change policy.
/// The <paramref name="signingCertificate"/> parameter MUST be one of the certificates returned by the <see cref="GetPolicyManagementCertificates(CancellationToken)"/> API.
/// <para/>
/// <para/>
/// Clients need to be able to verify that the attestation policy document was not modified before the policy document was received by the attestation service's enclave.
/// There are two properties provided in the [PolicyResult][attestation_policy_result] that can be used to verify that the service received the policy document:
/// <list type="bullet">
/// <item>
/// <description><see cref="PolicyResult.PolicySigner"/> - if the <see cref="SetPolicy(AttestationType, string, AsymmetricAlgorithm, X509Certificate2, CancellationToken)"/> call included a signing certificate, this will be the certificate provided at the time of the `SetPolicy` call. If no policy signer was set, this will be null. </description>
/// </item>
/// <item>
/// <description><see cref="PolicyResult.PolicyTokenHash"/> - this is the hash of the [JSON Web Token][json_web_token] sent to the service</description>
/// </item>
/// </list>
/// To verify the hash, clients can generate an attestation token and verify the hash generated from that token:
/// <code snippet="Snippet:VerifySigningHash">
/// // The SetPolicyAsync API will create a SecuredAttestationToken to transmit the policy.
/// var policySetToken = new SecuredAttestationToken(new StoredAttestationPolicy { AttestationPolicy = attestationPolicy }, TestEnvironment.PolicySigningKey0, policyTokenSigner);
///
/// var shaHasher = SHA256Managed.Create();
/// var attestationPolicyHash = shaHasher.ComputeHash(Encoding.UTF8.GetBytes(policySetToken.ToString()));
///
/// CollectionAssert.AreEqual(attestationPolicyHash, setResult.Value.PolicyTokenHash);
/// </code>
///
/// If the signing key and certificate are not provided, then the SetPolicyAsync API will create an unsecured attestation token
/// wrapping the attestation policy. To validate the <see cref="PolicyResult.PolicyTokenHash"/> return value, a developer
/// can create their own <see cref="UnsecuredAttestationToken"/> and create the hash of that.
/// <code>
/// var shaHasher = SHA256Managed.Create();
/// var policySetToken = new UnsecuredAttestationToken(new StoredAttestationPolicy { AttestationPolicy = disallowDebugging });
/// disallowDebuggingHash = shaHasher.ComputeHash(Encoding.UTF8.GetBytes(policySetToken.ToString()));
/// </code>
/// </remarks>
public virtual async Task <AttestationResponse <PolicyResult> > SetPolicyAsync(
AttestationType attestationType,
string policyToSet,
AsymmetricAlgorithm signingKey = default,
X509Certificate2 signingCertificate = default,
CancellationToken cancellationToken = default)
{
if (string.IsNullOrEmpty(policyToSet))
{
throw new ArgumentException($"'{nameof(policyToSet)}' cannot be null or empty.", nameof(policyToSet));
}
if (signingKey is null && signingCertificate is not null || signingCertificate is null && signingKey is not null)
{
throw new ArgumentException($"If you specify '{nameof(signingKey)}' or '{nameof(signingCertificate)}', you must also specify '{nameof(signingCertificate)}' or '{nameof(signingKey)}'.");
}
using DiagnosticScope scope = _clientDiagnostics.CreateScope($"{nameof(AttestationAdministrationClient)}.{nameof(SetPolicy)}");
scope.Start();
try
{
AttestationToken tokenToSet;
if (signingKey is null)
{
tokenToSet = new UnsecuredAttestationToken(new StoredAttestationPolicy {
AttestationPolicy = policyToSet,
});
}
else
{
tokenToSet = new SecuredAttestationToken(new StoredAttestationPolicy {
AttestationPolicy = policyToSet,
}, signingKey, signingCertificate);
}
var result = await _policyClient.SetAsync(attestationType, tokenToSet.ToString(), cancellationToken).ConfigureAwait(false);
var token = new AttestationToken(result.Value.Token);
if (_options.ValidateAttestationTokens)
{
token.ValidateToken(GetSigners(), _options.ValidationCallback);
}
return(new AttestationResponse <PolicyResult>(result.GetRawResponse(), token));
}
catch (Exception ex)
{
scope.Failed(ex);
throw;
}
}
/// <summary>
/// Resets the policy for the specified <see cref="AttestationType"/> to the default value.
/// </summary>
/// <param name="attestationType"><see cref="AttestationType"/> whose policy should be reset.</param>
/// <param name="signingKey">If provided, specifies the signing key used to sign the request to the attestation service.</param>
/// <param name="signingCertificate">If provided, specifies the X.509 certificate which will be used to validate the request with the attestation service.</param>
/// <param name="cancellationToken">Cancellation token used to cancel this operation.</param>
/// <returns>An <see cref="AttestationResponse{PolicyResult}"/> with the policy for the specified attestation type.</returns>
/// <remarks>
/// The <paramref name="signingKey"/> and <paramref name="signingCertificate"/> parameters are optional, but if one is provided the other must also be provided.
/// <para/>
/// If the <paramref name="signingKey"/> and <paramref name="signingCertificate"/> parameters are not provided, then the policy document sent to the
/// attestation service will be unsigned. Unsigned attestation policies are only allowed when the attestation instance is running in AAD mode - if the
/// attestation instance is running in Isolated mode, then a signing key and signing certificate MUST be provided to ensure that the caller of the API is authorized to change policy.
/// The <paramref name="signingCertificate"/> parameter MUST be one of the certificates returned by the <see cref="GetPolicyManagementCertificates(CancellationToken)"/> API.
/// <para/>
/// </remarks>
///
public virtual AttestationResponse <PolicyResult> ResetPolicy(
AttestationType attestationType,
AsymmetricAlgorithm signingKey = default,
X509Certificate2 signingCertificate = default,
CancellationToken cancellationToken = default)
{
if (signingKey is null && signingCertificate is not null || signingCertificate is null && signingKey is not null)
{
throw new ArgumentException($"If you specify '{nameof(signingKey)}' or '{nameof(signingCertificate)}', you must also specify '{nameof(signingCertificate)}' or '{nameof(signingKey)}'.");
}
using DiagnosticScope scope = _clientDiagnostics.CreateScope($"{nameof(AttestationAdministrationClient)}.{nameof(ResetPolicy)}");
scope.Start();
try
{
AttestationToken tokenToSet;
if (signingKey is null)
{
tokenToSet = new UnsecuredAttestationToken();
}
else
{
tokenToSet = new SecuredAttestationToken(signingKey, signingCertificate);
}
var result = _policyClient.Reset(attestationType, tokenToSet.ToString(), cancellationToken);
var token = new AttestationToken(result.Value.Token);
if (_options.ValidateAttestationTokens)
{
token.ValidateToken(GetSigners(), _options.ValidationCallback);
}
return(new AttestationResponse <PolicyResult>(result.GetRawResponse(), token));
}
catch (Exception ex)
{
scope.Failed(ex);
throw;
}
}
