/// <summary>
/// Removes one of the attestation policy management certificates.
/// </summary>
/// <param name="certificateToRemove">The certificate to remove.</param>
/// <param name="existingSigningKey">An existing key corresponding to the existing certificate.</param>
/// <param name="cancellationToken">Cancellation token used to cancel this operation.</param>
/// <returns>An <see cref="AttestationResponse{PolicyCertificatesModificationResult}"/> with the policy for the specified attestation type.</returns>
public virtual async Task <AttestationResponse <PolicyCertificatesModificationResult> > RemovePolicyManagementCertificateAsync(
X509Certificate2 certificateToRemove,
TokenSigningKey existingSigningKey,
CancellationToken cancellationToken = default)
{
using DiagnosticScope scope = _clientDiagnostics.CreateScope($"{nameof(AttestationAdministrationClient)}.{nameof(RemovePolicyManagementCertificate)}");
scope.Start();
try
{
var tokenToRemove = new AttestationToken(
new PolicyCertificateModification(certificateToRemove),
existingSigningKey);
var result = await _policyManagementClient.RemoveAsync(tokenToRemove.ToString(), cancellationToken).ConfigureAwait(false);
var token = new AttestationToken(result.Value.Token);
if (_options.TokenOptions.ValidateToken)
{
await token.ValidateTokenAsync(_options.TokenOptions, await GetSignersAsync(cancellationToken).ConfigureAwait(false), cancellationToken).ConfigureAwait(false);
}
return(new AttestationResponse <PolicyCertificatesModificationResult>(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="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>
/// If the <paramref name="signingKey"/> parameter is 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 <see cref="TokenSigningKey.Certificate"/> field MUST be one of the certificates returned by the <see cref="GetPolicyManagementCertificates(CancellationToken)"/> API.
/// <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, TokenSigningKey, 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 an AttestationToken signed with the TokenSigningKey to transmit the policy.
/// // To verify that the policy specified by the caller was received by the service inside the enclave, we
/// // verify that the hash of the policy document returned from the Attestation Service matches the hash
/// // of an attestation token created locally.
/// TokenSigningKey signingKey = new TokenSigningKey(<Customer provided signing key>, <Customer provided certificate>)
/// var policySetToken = new AttestationToken(
/// new StoredAttestationPolicy { AttestationPolicy = attestationPolicy },
/// signingKey);
///
/// using var shaHasher = SHA256Managed.Create();
/// var attestationPolicyHash = shaHasher.ComputeHash(Encoding.UTF8.GetBytes(policySetToken.ToString()));
///
/// Debug.Assert(attestationPolicyHash.SequenceEqual(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="AttestationToken"/> and create the hash of that.
/// <code>
/// using var shaHasher = SHA256Managed.Create();
/// var policySetToken = new AttestationToken(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,
TokenSigningKey signingKey = default,
CancellationToken cancellationToken = default)
{
if (string.IsNullOrEmpty(policyToSet))
{
throw new ArgumentException($"'{nameof(policyToSet)}' cannot be null or empty.", nameof(policyToSet));
}
using DiagnosticScope scope = _clientDiagnostics.CreateScope($"{nameof(AttestationAdministrationClient)}.{nameof(SetPolicy)}");
scope.Start();
try
{
AttestationToken tokenToSet = new AttestationToken(new StoredAttestationPolicy {
AttestationPolicy = policyToSet,
}, signingKey);
var result = await _policyClient.SetAsync(attestationType, tokenToSet.ToString(), cancellationToken).ConfigureAwait(false);
var token = new AttestationToken(result.Value.Token);
if (_options.TokenOptions.ValidateToken)
{
await token.ValidateTokenAsync(_options.TokenOptions, await GetSignersAsync(cancellationToken).ConfigureAwait(false), cancellationToken).ConfigureAwait(false);
}
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="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>
/// If the <paramref name="signingKey"/> parameter is 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 <see cref="TokenSigningKey.Certificate"/> parameter MUST be one of the certificates returned by the <see cref="GetPolicyManagementCertificates(CancellationToken)"/> API.
/// <para/>
/// </remarks>
public virtual async Task <AttestationResponse <PolicyResult> > ResetPolicyAsync(
AttestationType attestationType,
TokenSigningKey signingKey = default,
CancellationToken cancellationToken = default)
{
using DiagnosticScope scope = _clientDiagnostics.CreateScope($"{nameof(AttestationAdministrationClient)}.{nameof(ResetPolicy)}");
scope.Start();
try
{
AttestationToken tokenToSet = new AttestationToken(null, signingKey);
var result = await _policyClient.ResetAsync(attestationType, tokenToSet.ToString(), cancellationToken).ConfigureAwait(false);
var token = new AttestationToken(result.Value.Token);
if (_options.TokenOptions.ValidateToken)
{
await token.ValidateTokenAsync(_options.TokenOptions, await GetSignersAsync(cancellationToken).ConfigureAwait(false), cancellationToken).ConfigureAwait(false);
}
return(new AttestationResponse <PolicyResult>(result.GetRawResponse(), token));
}
catch (Exception ex)
{
scope.Failed(ex);
throw;
}
}
/// <summary>
/// Retrieves the attesttion policy for the specified <see cref="AttestationType"/>.
/// </summary>
/// <param name="attestationType">Attestation Type to retrive.</param>
/// <param name="cancellationToken">Cancellation token used to cancel this operation.</param>
/// <returns>An <see cref="AttestationResponse{String}"/> with the policy for the specified attestation type.</returns>
/// <remarks>
/// This API returns the underlying attestation policy object stored in the attestation service for this <paramref name="attestationType"/>.
///
/// The actual service response to the API is an RFC 7519 JSON Web Token. This token can be retrieved from <see cref="AttestationResponse{T}.Token"/>.
/// For the GetPolicyAsync API, the body of the <see cref="AttestationResponse{T}.Token"/> is a <see cref="StoredAttestationPolicy"/> object, NOT a string.
/// </remarks>
public virtual async Task <AttestationResponse <string> > GetPolicyAsync(AttestationType attestationType, CancellationToken cancellationToken = default)
{
using DiagnosticScope scope = _clientDiagnostics.CreateScope($"{nameof(AttestationAdministrationClient)}.{nameof(GetPolicy)}");
scope.Start();
try
{
var result = await _policyClient.GetAsync(attestationType, cancellationToken).ConfigureAwait(false);
var token = new AttestationToken(result.Value.Token);
if (_options.TokenOptions.ValidateToken)
{
await token.ValidateTokenAsync(_options.TokenOptions, await GetSignersAsync(cancellationToken).ConfigureAwait(false), cancellationToken).ConfigureAwait(false);
}
using var document = JsonDocument.Parse(token.TokenBody);
PolicyResult policyResult = PolicyResult.DeserializePolicyResult(document.RootElement);
var response = new AttestationResponse <StoredAttestationPolicy>(result.GetRawResponse(), policyResult.PolicyToken);
return(new AttestationResponse <string>(result.GetRawResponse(), policyResult.PolicyToken, response.Value.AttestationPolicy));
}
catch (Exception ex)
{
scope.Failed(ex);
throw;
}
}
/// <summary>
/// Returns the set of policy management certificates currently configured for the attestation service instance.
///
/// If the service instance is running in AAD mode, this list will always be empty.
/// </summary>
/// <param name="cancellationToken">Cancellation token used to cancel the operation.</param>
/// <returns>A set of <see cref="X509Certificate2"/> objects representing the set of root certificates for policy management.</returns>
public virtual async Task <AttestationResponse <PolicyCertificatesResult> > GetPolicyManagementCertificatesAsync(CancellationToken cancellationToken = default)
{
using DiagnosticScope scope = _clientDiagnostics.CreateScope($"{nameof(AttestationAdministrationClient)}.{nameof(GetPolicyManagementCertificates)}");
scope.Start();
try
{
var result = await _policyManagementClient.GetAsync(cancellationToken).ConfigureAwait(false);
var token = new AttestationToken(result.Value.Token);
if (_options.TokenOptions.ValidateToken)
{
await token.ValidateTokenAsync(_options.TokenOptions, await GetSignersAsync(cancellationToken).ConfigureAwait(false), cancellationToken).ConfigureAwait(false);
}
return(new AttestationResponse <PolicyCertificatesResult>(result.GetRawResponse(), token));
}
catch (Exception ex)
{
scope.Failed(ex);
throw;
}
}